From patchwork Fri May 12 20:22:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239659 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2CEAE1EA65 for ; Fri, 12 May 2023 20:23:27 +0000 (UTC) Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02C295B8F for ; Fri, 12 May 2023 13:23:22 -0700 (PDT) Received: by mail-wr1-x432.google.com with SMTP id ffacd0b85a97d-307d20548adso1411463f8f.0 for ; Fri, 12 May 2023 13:23:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923000; x=1686515000; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=sddrjsag3WdHUBWk+FsQ54pZHijONEeZvMeHiWZaE2U=; b=WIsuxktH28RqGQpFIkrCg6cWD5+7oSSwLNvyTa7ziglY20Trs2xL575aIPIT7ledHS A/ppXhoXQiATNi0dLcgJheG9dTN1xWTZFfKVV3MFA2F8hOV41xV//lnffEh/T5Jmtsz1 xQhIYjY47TJ7Cj/bs3oAmMN9OBILuS41/NrKnOn9AAc53ek0eZbywjzgrF8C1cux5ocU bb2urhuId35mZLb4Zc8+Ra5MLbGvi82tX4qtTxGrq/rmY6GhM3GxXJnAQe5TdZJa0Q2W kN0oJ+MZ928zJ5ffEfgnFyUBOrvYHAe1PRFLrTi2hPHdQpzRi13bXV/bZnWpgXNCYnmy KGlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923000; x=1686515000; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=sddrjsag3WdHUBWk+FsQ54pZHijONEeZvMeHiWZaE2U=; b=jb0fBK0N0Z1l0O2OvW04DFvERYznwHelpr0RR7jMYs2kQk7EDTiQmJ6ukxZQpMjuWI E97YExIHWQF0QYkOg2hOa/fgMoT4T38yMBFJFRU8+AN/sBVvozMLZHTQxyGGEpS+ZLYx 4tgdgkqFHjRa+Ti7q50CtnchMAOcOX69+YG6ovb9NKkBXM0EZKwlKTJUqQrrF+XIIoZ6 zRWyRMVXoZvul1FbvrEmRBts3klNZt5zDH+8WA2EhUhBX0BJPJireUSWl9RwkVPUwuF1 gZHhbaEgpb158sEcJbfaloY2RotZze/5mbQ64VeC/EgMrp3dkq4gdyNYnYchiXlw5ZO5 M7xg== X-Gm-Message-State: AC+VfDxHwojTyh34SluDQhR9AviiLdH+H908psqUvPUIt/AL13OWLRhg e5119vSLAO0eoVOctkX1vwPB9Q== X-Google-Smtp-Source: ACHHUZ5mQF+NOXWUQvp1B/NkheGIlvqYY+2US6TXGi1XCXDvGvirRjFRowYRZz3nun//geaclhFOJQ== X-Received: by 2002:a5d:674b:0:b0:306:2dc3:8b67 with SMTP id l11-20020a5d674b000000b003062dc38b67mr19623621wrw.53.1683922999947; Fri, 12 May 2023 13:23:19 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:19 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 01/21] net/tcp: Prepare tcp_md5sig_pool for TCP-AO Date: Fri, 12 May 2023 21:22:51 +0100 Message-Id: <20230512202311.2845526-2-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org TCP-AO, similarly to TCP-MD5, needs to allocate tfms on a slow-path, which is setsockopt() and use crypto ahash requests on fast paths, which are RX/TX softirqs. Also, it needs a temporary/scratch buffer for preparing the hash. Rework tcp_md5sig_pool in order to support other hashing algorithms than MD5. It will make it possible to share pre-allocated crypto_ahash descriptors and scratch area between all TCP hash users. Internally tcp_sigpool preferences crypto_clone_ahash() API over pre-allocating per-CPU crypto requests. Kudos to Herbert, who provided this new crypto API [1]. Currently, there's still per-CPU crypto request allocation fallback, that is needed for ciphers, that yet don't support cloning (TCP-AO requires cmac(aes128) in RFC5925). I was a little concerned over GFP_ATOMIC allocations of ahash and crypto_request in RX/TX (see tcp_sigpool_start()), so I benchmarked both "backends" with different algorithms, using patched version of iperf3[2]. On my laptop with i7-7600U @ 2.80GHz: clone-tfm per-CPU-requests TCP-MD5 2.25 Gbits/sec 2.30 Gbits/sec TCP-AO(hmac(sha1)) 2.53 Gbits/sec 2.54 Gbits/sec TCP-AO(hmac(sha512)) 1.67 Gbits/sec 1.64 Gbits/sec TCP-AO(hmac(sha384)) 1.77 Gbits/sec 1.80 Gbits/sec TCP-AO(hmac(sha224)) 1.29 Gbits/sec 1.30 Gbits/sec TCP-AO(hmac(sha3-512)) 481 Mbits/sec 480 Mbits/sec TCP-AO(hmac(md5)) 2.07 Gbits/sec 2.12 Gbits/sec TCP-AO(hmac(rmd160)) 1.01 Gbits/sec 995 Mbits/sec TCP-AO(cmac(aes128)) [not supporetd yet] 2.11 Gbits/sec So, it seems that my concerns don't have strong grounds and per-CPU crypto_request allocation can be dropped/removed from tcp_sigpool once ciphers get crypto_clone_ahash() support. [1]: https://lore.kernel.org/all/ZDefxOq6Ax0JeTRH@gondor.apana.org.au/T/#u [2]: https://github.com/0x7f454c46/iperf/tree/tcp-md5-ao Signed-off-by: Dmitry Safonov Acked-by: Ard Biesheuvel --- include/net/tcp.h | 47 ++-- net/ipv4/Kconfig | 4 + net/ipv4/Makefile | 1 + net/ipv4/tcp.c | 135 ++---------- net/ipv4/tcp_ipv4.c | 97 ++++---- net/ipv4/tcp_minisocks.c | 21 +- net/ipv4/tcp_sigpool.c | 462 +++++++++++++++++++++++++++++++++++++++ net/ipv6/tcp_ipv6.c | 58 +++-- 8 files changed, 616 insertions(+), 209 deletions(-) create mode 100644 net/ipv4/tcp_sigpool.c diff --git a/include/net/tcp.h b/include/net/tcp.h index 04a31643cda3..b77cc2e0b8e6 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1667,12 +1667,36 @@ union tcp_md5sum_block { #endif }; -/* - pool: digest algorithm, hash description and scratch buffer */ -struct tcp_md5sig_pool { - struct ahash_request *md5_req; - void *scratch; +/* + * struct tcp_sigpool - per-CPU pool of ahash_requests + * @scratch: per-CPU temporary area, that can be used between + * tcp_sigpool_start() and tcp_sigpool_end() to perform + * crypto request + * @req: pre-allocated ahash request + */ +struct tcp_sigpool { + void *scratch; + struct ahash_request *req; + bool free_req; }; +int tcp_sigpool_alloc_ahash(const char *alg, size_t scratch_size); +void tcp_sigpool_get(unsigned int id); +void tcp_sigpool_release(unsigned int id); +int tcp_sigpool_hash_skb_data(struct tcp_sigpool *hp, + const struct sk_buff *skb, + unsigned int header_len); +/** + * tcp_sigpool_start - disable bh and start using tcp_sigpool_ahash + * @id: tcp_sigpool that was previously allocated by tcp_sigpool_alloc_ahash() + * @c: returned tcp_sigpool for usage (uninitialized on failure) + */ +int tcp_sigpool_start(unsigned int id, struct tcp_sigpool *c); +/** + * tcp_sigpool_end - enable bh and stop using tcp_sigpool + */ +void tcp_sigpool_end(struct tcp_sigpool *c); +size_t tcp_sigpool_algo(unsigned int id, char *buf, size_t buf_len); /* - functions */ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, const struct sock *sk, const struct sk_buff *skb); @@ -1728,17 +1752,12 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, #define tcp_twsk_md5_key(twsk) NULL #endif -bool tcp_alloc_md5sig_pool(void); +int tcp_md5_alloc_sigpool(void); +void tcp_md5_release_sigpool(void); +void tcp_md5_add_sigpool(void); +extern int tcp_md5_sigpool_id; -struct tcp_md5sig_pool *tcp_get_md5sig_pool(void); -static inline void tcp_put_md5sig_pool(void) -{ - local_bh_enable(); -} - -int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *, - unsigned int header_len); -int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, +int tcp_md5_hash_key(struct tcp_sigpool *hp, const struct tcp_md5sig_key *key); /* From tcp_fastopen.c */ diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 2dfb12230f08..89e2ab023272 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -741,10 +741,14 @@ config DEFAULT_TCP_CONG default "bbr" if DEFAULT_BBR default "cubic" +config TCP_SIGPOOL + tristate + config TCP_MD5SIG bool "TCP: MD5 Signature Option support (RFC2385)" select CRYPTO select CRYPTO_MD5 + select TCP_SIGPOOL help RFC2385 specifies a method of giving MD5 protection to TCP sessions. Its main (only?) use is to protect BGP sessions between core routers diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile index b18ba8ef93ad..cd760793cfcb 100644 --- a/net/ipv4/Makefile +++ b/net/ipv4/Makefile @@ -62,6 +62,7 @@ obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o +obj-$(CONFIG_TCP_SIGPOOL) += tcp_sigpool.o obj-$(CONFIG_NET_SOCK_MSG) += tcp_bpf.o obj-$(CONFIG_BPF_SYSCALL) += udp_bpf.o obj-$(CONFIG_NETLABEL) += cipso_ipv4.o diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 4d6392c16b7a..4ab77d02aef2 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4417,141 +4417,44 @@ int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, EXPORT_SYMBOL(tcp_getsockopt); #ifdef CONFIG_TCP_MD5SIG -static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool); -static DEFINE_MUTEX(tcp_md5sig_mutex); -static bool tcp_md5sig_pool_populated = false; +int tcp_md5_sigpool_id = -1; +EXPORT_SYMBOL_GPL(tcp_md5_sigpool_id); -static void __tcp_alloc_md5sig_pool(void) +int tcp_md5_alloc_sigpool(void) { - struct crypto_ahash *hash; - int cpu; + size_t scratch_size; + int ret; - hash = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC); - if (IS_ERR(hash)) - return; - - for_each_possible_cpu(cpu) { - void *scratch = per_cpu(tcp_md5sig_pool, cpu).scratch; - struct ahash_request *req; - - if (!scratch) { - scratch = kmalloc_node(sizeof(union tcp_md5sum_block) + - sizeof(struct tcphdr), - GFP_KERNEL, - cpu_to_node(cpu)); - if (!scratch) - return; - per_cpu(tcp_md5sig_pool, cpu).scratch = scratch; - } - if (per_cpu(tcp_md5sig_pool, cpu).md5_req) - continue; - - req = ahash_request_alloc(hash, GFP_KERNEL); - if (!req) - return; - - ahash_request_set_callback(req, 0, NULL, NULL); - - per_cpu(tcp_md5sig_pool, cpu).md5_req = req; + scratch_size = sizeof(union tcp_md5sum_block) + sizeof(struct tcphdr); + ret = tcp_sigpool_alloc_ahash("md5", scratch_size); + if (ret >= 0) { + tcp_md5_sigpool_id = ret; + return 0; } - /* before setting tcp_md5sig_pool_populated, we must commit all writes - * to memory. See smp_rmb() in tcp_get_md5sig_pool() - */ - smp_wmb(); - /* Paired with READ_ONCE() from tcp_alloc_md5sig_pool() - * and tcp_get_md5sig_pool(). - */ - WRITE_ONCE(tcp_md5sig_pool_populated, true); + return ret; } -bool tcp_alloc_md5sig_pool(void) +void tcp_md5_release_sigpool(void) { - /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */ - if (unlikely(!READ_ONCE(tcp_md5sig_pool_populated))) { - mutex_lock(&tcp_md5sig_mutex); - - if (!tcp_md5sig_pool_populated) - __tcp_alloc_md5sig_pool(); - - mutex_unlock(&tcp_md5sig_mutex); - } - /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */ - return READ_ONCE(tcp_md5sig_pool_populated); + tcp_sigpool_release(tcp_md5_sigpool_id); } -EXPORT_SYMBOL(tcp_alloc_md5sig_pool); - -/** - * tcp_get_md5sig_pool - get md5sig_pool for this user - * - * We use percpu structure, so if we succeed, we exit with preemption - * and BH disabled, to make sure another thread or softirq handling - * wont try to get same context. - */ -struct tcp_md5sig_pool *tcp_get_md5sig_pool(void) +void tcp_md5_add_sigpool(void) { - local_bh_disable(); - - /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */ - if (READ_ONCE(tcp_md5sig_pool_populated)) { - /* coupled with smp_wmb() in __tcp_alloc_md5sig_pool() */ - smp_rmb(); - return this_cpu_ptr(&tcp_md5sig_pool); - } - local_bh_enable(); - return NULL; + tcp_sigpool_get(tcp_md5_sigpool_id); } -EXPORT_SYMBOL(tcp_get_md5sig_pool); -int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp, - const struct sk_buff *skb, unsigned int header_len) -{ - struct scatterlist sg; - const struct tcphdr *tp = tcp_hdr(skb); - struct ahash_request *req = hp->md5_req; - unsigned int i; - const unsigned int head_data_len = skb_headlen(skb) > header_len ? - skb_headlen(skb) - header_len : 0; - const struct skb_shared_info *shi = skb_shinfo(skb); - struct sk_buff *frag_iter; - - sg_init_table(&sg, 1); - - sg_set_buf(&sg, ((u8 *) tp) + header_len, head_data_len); - ahash_request_set_crypt(req, &sg, NULL, head_data_len); - if (crypto_ahash_update(req)) - return 1; - - for (i = 0; i < shi->nr_frags; ++i) { - const skb_frag_t *f = &shi->frags[i]; - unsigned int offset = skb_frag_off(f); - struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT); - - sg_set_page(&sg, page, skb_frag_size(f), - offset_in_page(offset)); - ahash_request_set_crypt(req, &sg, NULL, skb_frag_size(f)); - if (crypto_ahash_update(req)) - return 1; - } - - skb_walk_frags(skb, frag_iter) - if (tcp_md5_hash_skb_data(hp, frag_iter, 0)) - return 1; - - return 0; -} -EXPORT_SYMBOL(tcp_md5_hash_skb_data); - -int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key) +int tcp_md5_hash_key(struct tcp_sigpool *hp, + const struct tcp_md5sig_key *key) { u8 keylen = READ_ONCE(key->keylen); /* paired with WRITE_ONCE() in tcp_md5_do_add */ struct scatterlist sg; sg_init_one(&sg, key->key, keylen); - ahash_request_set_crypt(hp->md5_req, &sg, NULL, keylen); + ahash_request_set_crypt(hp->req, &sg, NULL, keylen); /* We use data_race() because tcp_md5_do_add() might change key->key under us */ - return data_race(crypto_ahash_update(hp->md5_req)); + return data_race(crypto_ahash_update(hp->req)); } EXPORT_SYMBOL(tcp_md5_hash_key); diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 39bda2b1066e..c6fd2e071e4a 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1212,10 +1212,6 @@ static int __tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, key = sock_kmalloc(sk, sizeof(*key), gfp | __GFP_ZERO); if (!key) return -ENOMEM; - if (!tcp_alloc_md5sig_pool()) { - sock_kfree_s(sk, key, sizeof(*key)); - return -ENOMEM; - } memcpy(key->key, newkey, newkeylen); key->keylen = newkeylen; @@ -1237,15 +1233,21 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, struct tcp_sock *tp = tcp_sk(sk); if (!rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk))) { - if (tcp_md5sig_info_add(sk, GFP_KERNEL)) + if (tcp_md5_alloc_sigpool()) return -ENOMEM; + if (tcp_md5sig_info_add(sk, GFP_KERNEL)) { + tcp_md5_release_sigpool(); + return -ENOMEM; + } + if (!static_branch_inc(&tcp_md5_needed.key)) { struct tcp_md5sig_info *md5sig; md5sig = rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk)); rcu_assign_pointer(tp->md5sig_info, NULL); kfree_rcu(md5sig, rcu); + tcp_md5_release_sigpool(); return -EUSERS; } } @@ -1262,8 +1264,12 @@ int tcp_md5_key_copy(struct sock *sk, const union tcp_md5_addr *addr, struct tcp_sock *tp = tcp_sk(sk); if (!rcu_dereference_protected(tp->md5sig_info, lockdep_sock_is_held(sk))) { - if (tcp_md5sig_info_add(sk, sk_gfp_mask(sk, GFP_ATOMIC))) + tcp_md5_add_sigpool(); + + if (tcp_md5sig_info_add(sk, sk_gfp_mask(sk, GFP_ATOMIC))) { + tcp_md5_release_sigpool(); return -ENOMEM; + } if (!static_key_fast_inc_not_disabled(&tcp_md5_needed.key.key)) { struct tcp_md5sig_info *md5sig; @@ -1272,6 +1278,7 @@ int tcp_md5_key_copy(struct sock *sk, const union tcp_md5_addr *addr, net_warn_ratelimited("Too many TCP-MD5 keys in the system\n"); rcu_assign_pointer(tp->md5sig_info, NULL); kfree_rcu(md5sig, rcu); + tcp_md5_release_sigpool(); return -EUSERS; } } @@ -1371,7 +1378,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, cmd.tcpm_key, cmd.tcpm_keylen); } -static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp, +static int tcp_v4_md5_hash_headers(struct tcp_sigpool *hp, __be32 daddr, __be32 saddr, const struct tcphdr *th, int nbytes) { @@ -1391,38 +1398,35 @@ static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp, _th->check = 0; sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); - ahash_request_set_crypt(hp->md5_req, &sg, NULL, + ahash_request_set_crypt(hp->req, &sg, NULL, sizeof(*bp) + sizeof(*th)); - return crypto_ahash_update(hp->md5_req); + return crypto_ahash_update(hp->req); } static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, __be32 daddr, __be32 saddr, const struct tcphdr *th) { - struct tcp_md5sig_pool *hp; - struct ahash_request *req; + struct tcp_sigpool hp; - hp = tcp_get_md5sig_pool(); - if (!hp) - goto clear_hash_noput; - req = hp->md5_req; + if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp)) + goto clear_hash_nostart; - if (crypto_ahash_init(req)) + if (crypto_ahash_init(hp.req)) goto clear_hash; - if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) + if (tcp_v4_md5_hash_headers(&hp, daddr, saddr, th, th->doff << 2)) goto clear_hash; - if (tcp_md5_hash_key(hp, key)) + if (tcp_md5_hash_key(&hp, key)) goto clear_hash; - ahash_request_set_crypt(req, NULL, md5_hash, 0); - if (crypto_ahash_final(req)) + ahash_request_set_crypt(hp.req, NULL, md5_hash, 0); + if (crypto_ahash_final(hp.req)) goto clear_hash; - tcp_put_md5sig_pool(); + tcp_sigpool_end(&hp); return 0; clear_hash: - tcp_put_md5sig_pool(); -clear_hash_noput: + tcp_sigpool_end(&hp); +clear_hash_nostart: memset(md5_hash, 0, 16); return 1; } @@ -1431,8 +1435,7 @@ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, const struct sock *sk, const struct sk_buff *skb) { - struct tcp_md5sig_pool *hp; - struct ahash_request *req; + struct tcp_sigpool hp; const struct tcphdr *th = tcp_hdr(skb); __be32 saddr, daddr; @@ -1445,30 +1448,28 @@ int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key, daddr = iph->daddr; } - hp = tcp_get_md5sig_pool(); - if (!hp) - goto clear_hash_noput; - req = hp->md5_req; + if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp)) + goto clear_hash_nostart; - if (crypto_ahash_init(req)) + if (crypto_ahash_init(hp.req)) goto clear_hash; - if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len)) + if (tcp_v4_md5_hash_headers(&hp, daddr, saddr, th, skb->len)) goto clear_hash; - if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) + if (tcp_sigpool_hash_skb_data(&hp, skb, th->doff << 2)) goto clear_hash; - if (tcp_md5_hash_key(hp, key)) + if (tcp_md5_hash_key(&hp, key)) goto clear_hash; - ahash_request_set_crypt(req, NULL, md5_hash, 0); - if (crypto_ahash_final(req)) + ahash_request_set_crypt(hp.req, NULL, md5_hash, 0); + if (crypto_ahash_final(hp.req)) goto clear_hash; - tcp_put_md5sig_pool(); + tcp_sigpool_end(&hp); return 0; clear_hash: - tcp_put_md5sig_pool(); -clear_hash_noput: + tcp_sigpool_end(&hp); +clear_hash_nostart: memset(md5_hash, 0, 16); return 1; } @@ -2286,6 +2287,18 @@ static int tcp_v4_init_sock(struct sock *sk) return 0; } +#ifdef CONFIG_TCP_MD5SIG +static void tcp_md5sig_info_free_rcu(struct rcu_head *head) +{ + struct tcp_md5sig_info *md5sig; + + md5sig = container_of(head, struct tcp_md5sig_info, rcu); + kfree(md5sig); + static_branch_slow_dec_deferred(&tcp_md5_needed); + tcp_md5_release_sigpool(); +} +#endif + void tcp_v4_destroy_sock(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); @@ -2310,10 +2323,12 @@ void tcp_v4_destroy_sock(struct sock *sk) #ifdef CONFIG_TCP_MD5SIG /* Clean up the MD5 key list, if any */ if (tp->md5sig_info) { + struct tcp_md5sig_info *md5sig; + + md5sig = rcu_dereference_protected(tp->md5sig_info, 1); tcp_clear_md5_list(sk); - kfree_rcu(rcu_dereference_protected(tp->md5sig_info, 1), rcu); - tp->md5sig_info = NULL; - static_branch_slow_dec_deferred(&tcp_md5_needed); + call_rcu(&md5sig->rcu, tcp_md5sig_info_free_rcu); + rcu_assign_pointer(tp->md5sig_info, NULL); } #endif diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index dac0d62120e6..63b5c5f42a87 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -261,10 +261,9 @@ static void tcp_time_wait_init(struct sock *sk, struct tcp_timewait_sock *tcptw) tcptw->tw_md5_key = kmemdup(key, sizeof(*key), GFP_ATOMIC); if (!tcptw->tw_md5_key) return; - if (!tcp_alloc_md5sig_pool()) - goto out_free; if (!static_key_fast_inc_not_disabled(&tcp_md5_needed.key.key)) goto out_free; + tcp_md5_add_sigpool(); } return; out_free: @@ -349,16 +348,26 @@ void tcp_time_wait(struct sock *sk, int state, int timeo) } EXPORT_SYMBOL(tcp_time_wait); +#ifdef CONFIG_TCP_MD5SIG +static void tcp_md5_twsk_free_rcu(struct rcu_head *head) +{ + struct tcp_md5sig_key *key; + + key = container_of(head, struct tcp_md5sig_key, rcu); + kfree(key); + static_branch_slow_dec_deferred(&tcp_md5_needed); + tcp_md5_release_sigpool(); +} +#endif + void tcp_twsk_destructor(struct sock *sk) { #ifdef CONFIG_TCP_MD5SIG if (static_branch_unlikely(&tcp_md5_needed.key)) { struct tcp_timewait_sock *twsk = tcp_twsk(sk); - if (twsk->tw_md5_key) { - kfree_rcu(twsk->tw_md5_key, rcu); - static_branch_slow_dec_deferred(&tcp_md5_needed); - } + if (twsk->tw_md5_key) + call_rcu(&twsk->tw_md5_key->rcu, tcp_md5_twsk_free_rcu); } #endif } diff --git a/net/ipv4/tcp_sigpool.c b/net/ipv4/tcp_sigpool.c new file mode 100644 index 000000000000..2413777a85a8 --- /dev/null +++ b/net/ipv4/tcp_sigpool.c @@ -0,0 +1,462 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include +#include +#include + +static size_t __scratch_size; +static DEFINE_PER_CPU(void __rcu *, sigpool_scratch); + +union sigpool_req { + struct ahash_request *__percpu *pcp_req; + struct crypto_ahash *hash; +}; + +struct sigpool_entry { + union sigpool_req spr; + const char *alg; + struct kref kref; + uint16_t needs_key:1, + clone_ahash:1, + reserved:14; +}; + +#define CPOOL_SIZE (PAGE_SIZE / sizeof(struct sigpool_entry)) +static struct sigpool_entry cpool[CPOOL_SIZE]; +static unsigned int cpool_populated; +static DEFINE_MUTEX(cpool_mutex); + +/* Slow-path */ +struct scratches_to_free { + struct rcu_head rcu; + unsigned int cnt; + void *scratches[]; +}; + +static void free_old_scratches(struct rcu_head *head) +{ + struct scratches_to_free *stf; + + stf = container_of(head, struct scratches_to_free, rcu); + while (stf->cnt--) + kfree(stf->scratches[stf->cnt]); + kfree(stf); +} + +/** + * sigpool_reserve_scratch - re-allocates scratch buffer, slow-path + * @size: request size for the scratch/temp buffer + */ +static int sigpool_reserve_scratch(size_t size) +{ + struct scratches_to_free *stf; + size_t stf_sz = struct_size(stf, scratches, num_possible_cpus()); + int cpu, err = 0; + + lockdep_assert_held(&cpool_mutex); + if (__scratch_size >= size) + return 0; + + stf = kmalloc(stf_sz, GFP_KERNEL); + if (!stf) + return -ENOMEM; + stf->cnt = 0; + + size = max(size, __scratch_size); + cpus_read_lock(); + for_each_possible_cpu(cpu) { + void *scratch, *old_scratch; + + scratch = kmalloc_node(size, GFP_KERNEL, cpu_to_node(cpu)); + if (!scratch) { + err = -ENOMEM; + break; + } + + old_scratch = rcu_replace_pointer(per_cpu(sigpool_scratch, cpu), scratch, lockdep_is_held(&cpool_mutex)); + if (!cpu_online(cpu) || !old_scratch) { + kfree(old_scratch); + continue; + } + stf->scratches[stf->cnt++] = old_scratch; + } + cpus_read_unlock(); + if (!err) + __scratch_size = size; + + call_rcu(&stf->rcu, free_old_scratches); + return err; +} + +static void sigpool_scratch_free(void) +{ + int cpu; + + for_each_possible_cpu(cpu) + kfree(rcu_replace_pointer(per_cpu(sigpool_scratch, cpu), + NULL, lockdep_is_held(&cpool_mutex))); + __scratch_size = 0; +} + +static int __cpool_alloc_pcp(struct sigpool_entry *e, const char *alg, + struct crypto_ahash *cpu0_hash) +{ + struct crypto_ahash *hash; + int cpu, ret; + + e->spr.pcp_req = alloc_percpu(struct ahash_request *); + if (!e->spr.pcp_req) + return -ENOMEM; + + hash = cpu0_hash; + for_each_possible_cpu(cpu) { + struct ahash_request *req; + + /* If ahash has a key - it has to be allocated per-CPU. + * In such case re-use for CPU0 hash that just have been + * allocated above. + */ + if (!hash) + hash = crypto_alloc_ahash(alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(hash)) + goto out_free_per_cpu; + + req = ahash_request_alloc(hash, GFP_KERNEL); + if (!req) + goto out_free_hash; + + ahash_request_set_callback(req, 0, NULL, NULL); + + *per_cpu_ptr(e->spr.pcp_req, cpu) = req; + + if (e->needs_key) + hash = NULL; + } + return 0; + +out_free_hash: + if (hash != cpu0_hash) + crypto_free_ahash(hash); + +out_free_per_cpu: + for_each_possible_cpu(cpu) { + struct ahash_request *req = *per_cpu_ptr(e->spr.pcp_req, cpu); + struct crypto_ahash *pcpu_hash; + + if (!req) + break; + pcpu_hash = crypto_ahash_reqtfm(req); + ahash_request_free(req); + /* hash per-CPU, e->needs_key == true */ + if (pcpu_hash != cpu0_hash) + crypto_free_ahash(pcpu_hash); + } + + free_percpu(e->spr.pcp_req); + return ret; +} + +static int __cpool_try_clone(struct crypto_ahash *hash) +{ + struct crypto_ahash *tmp; + + tmp = crypto_clone_ahash(hash); + if (IS_ERR(tmp)) + return PTR_ERR(tmp); + + crypto_free_ahash(tmp); + return 0; +} + +static int __cpool_alloc_ahash(struct sigpool_entry *e, const char *alg) +{ + struct crypto_ahash *cpu0_hash; + int ret; + + e->alg = kstrdup(alg, GFP_KERNEL); + if (!e->alg) + return -ENOMEM; + + cpu0_hash = crypto_alloc_ahash(alg, 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(cpu0_hash)) { + ret = PTR_ERR(cpu0_hash); + goto out_free_alg; + } + + e->needs_key = crypto_ahash_get_flags(cpu0_hash) & CRYPTO_TFM_NEED_KEY; + + ret = __cpool_try_clone(cpu0_hash); + if (!ret) { + e->clone_ahash = 1; + e->spr.hash = cpu0_hash; + kref_init(&e->kref); + return 0; + } + if (ret != -ENOSYS) + goto out_free_cpu0_hash; + + /* Fall back to per-cpu ahash request allocation. */ + ret = __cpool_alloc_pcp(e, alg, cpu0_hash); + if (ret) + goto out_free_cpu0_hash; + e->clone_ahash = 0; + kref_init(&e->kref); + return 0; + +out_free_cpu0_hash: + crypto_free_ahash(cpu0_hash); +out_free_alg: + kfree(e->alg); + e->alg = NULL; + return ret; +} + +/** + * tcp_sigpool_alloc_ahash - allocates pool for ahash requests + * @alg: name of async hash algorithm + * @scratch_size: reserve a tcp_sigpool::scratch buffer of this size + */ +int tcp_sigpool_alloc_ahash(const char *alg, size_t scratch_size) +{ + int i, ret; + + /* slow-path */ + mutex_lock(&cpool_mutex); + ret = sigpool_reserve_scratch(scratch_size); + if (ret) + goto out; + for (i = 0; i < cpool_populated; i++) { + if (!cpool[i].alg) + continue; + if (strcmp(cpool[i].alg, alg)) + continue; + + if (kref_read(&cpool[i].kref) > 0) + kref_get(&cpool[i].kref); + else + kref_init(&cpool[i].kref); + ret = i; + goto out; + } + + for (i = 0; i < cpool_populated; i++) { + if (!cpool[i].alg) + break; + } + if (i >= CPOOL_SIZE) { + ret = -ENOSPC; + goto out; + } + + ret = __cpool_alloc_ahash(&cpool[i], alg); + if (!ret) { + ret = i; + if (i == cpool_populated) + cpool_populated++; + } +out: + mutex_unlock(&cpool_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(tcp_sigpool_alloc_ahash); + +static void __cpool_free_pcp(struct sigpool_entry *e) +{ + struct crypto_ahash *hash = NULL; + int cpu; + + for_each_possible_cpu(cpu) { + if (*per_cpu_ptr(e->spr.pcp_req, cpu) == NULL) + continue; + + hash = crypto_ahash_reqtfm(*per_cpu_ptr(e->spr.pcp_req, cpu)); + ahash_request_free(*per_cpu_ptr(e->spr.pcp_req, cpu)); + if (e->needs_key) { + crypto_free_ahash(hash); + hash = NULL; + } + } + if (hash) + crypto_free_ahash(hash); + free_percpu(e->spr.pcp_req); +} + +static void __cpool_free_entry(struct sigpool_entry *e) +{ + if (e->clone_ahash) + crypto_free_ahash(e->spr.hash); + else + __cpool_free_pcp(e); + + kfree(e->alg); + memset(e, 0, sizeof(*e)); +} + +static void cpool_cleanup_work_cb(struct work_struct *work) +{ + unsigned int i; + bool free_scratch = true; + + mutex_lock(&cpool_mutex); + for (i = 0; i < cpool_populated; i++) { + if (kref_read(&cpool[i].kref) > 0) { + free_scratch = false; + continue; + } + if (!cpool[i].alg) + continue; + __cpool_free_entry(&cpool[i]); + } + if (free_scratch) + sigpool_scratch_free(); + mutex_unlock(&cpool_mutex); +} + +static DECLARE_WORK(cpool_cleanup_work, cpool_cleanup_work_cb); +static void cpool_schedule_cleanup(struct kref *kref) +{ + schedule_work(&cpool_cleanup_work); +} + +/** + * tcp_sigpool_release - decreases number of users for a pool. If it was + * the last user of the pool, releases any memory that was consumed. + * @id: tcp_sigpool that was previously allocated by tcp_sigpool_alloc_ahash() + */ +void tcp_sigpool_release(unsigned int id) +{ + if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) + return; + + /* slow-path */ + kref_put(&cpool[id].kref, cpool_schedule_cleanup); +} +EXPORT_SYMBOL_GPL(tcp_sigpool_release); + +/** + * tcp_sigpool_get - increases number of users (refcounter) for a pool + * @id: tcp_sigpool that was previously allocated by tcp_sigpool_alloc_ahash() + */ +void tcp_sigpool_get(unsigned int id) +{ + if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) + return; + kref_get(&cpool[id].kref); +} +EXPORT_SYMBOL_GPL(tcp_sigpool_get); + +int tcp_sigpool_start(unsigned int id, struct tcp_sigpool *c) +{ + rcu_read_lock_bh(); + if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) { + rcu_read_unlock_bh(); + return -EINVAL; + } + + c->free_req = cpool[id].clone_ahash; + if (cpool[id].clone_ahash) { + struct crypto_ahash *hash; + + hash = crypto_clone_ahash(cpool[id].spr.hash); + if (IS_ERR(hash)) { + rcu_read_unlock_bh(); + return PTR_ERR(hash); + } + c->req = ahash_request_alloc(hash, GFP_ATOMIC); + if (!c->req) { + crypto_free_ahash(hash); + rcu_read_unlock_bh(); + return -ENOMEM; + } + ahash_request_set_callback(c->req, 0, NULL, NULL); + } else { + c->req = *this_cpu_ptr(cpool[id].spr.pcp_req); + } + /* Pairs with tcp_sigpool_reserve_scratch(), scratch area is + * valid (allocated) until tcp_sigpool_end(). + */ + c->scratch = rcu_dereference_bh(*this_cpu_ptr(&sigpool_scratch)); + return 0; +} +EXPORT_SYMBOL_GPL(tcp_sigpool_start); + +void tcp_sigpool_end(struct tcp_sigpool *c) +{ + rcu_read_unlock_bh(); + if (c->free_req) { + struct crypto_ahash *hash = crypto_ahash_reqtfm(c->req); + + ahash_request_free(c->req); + crypto_free_ahash(hash); + } +} +EXPORT_SYMBOL_GPL(tcp_sigpool_end); + +/** + * tcp_sigpool_algo - return algorithm of tcp_sigpool + * @id: tcp_sigpool that was previously allocated by tcp_sigpool_alloc_ahash() + * @buf: buffer to return name of algorithm + * @buf_len: size of @buf + */ +size_t tcp_sigpool_algo(unsigned int id, char *buf, size_t buf_len) +{ + if (WARN_ON_ONCE(id > cpool_populated || !cpool[id].alg)) + return -EINVAL; + + return strscpy(buf, cpool[id].alg, buf_len); +} +EXPORT_SYMBOL_GPL(tcp_sigpool_algo); + +/** + * tcp_sigpool_hash_skb_data - hash data in skb with initialized tcp_sigpool + * @hp: tcp_sigpool pointer + * @skb: buffer to add sign for + * @header_len: TCP header length for this segment + */ +int tcp_sigpool_hash_skb_data(struct tcp_sigpool *hp, + const struct sk_buff *skb, + unsigned int header_len) +{ + struct scatterlist sg; + const struct tcphdr *tp = tcp_hdr(skb); + struct ahash_request *req = hp->req; + unsigned int i; + const unsigned int head_data_len = skb_headlen(skb) > header_len ? + skb_headlen(skb) - header_len : 0; + const struct skb_shared_info *shi = skb_shinfo(skb); + struct sk_buff *frag_iter; + + sg_init_table(&sg, 1); + + sg_set_buf(&sg, ((u8 *)tp) + header_len, head_data_len); + ahash_request_set_crypt(req, &sg, NULL, head_data_len); + if (crypto_ahash_update(req)) + return 1; + + for (i = 0; i < shi->nr_frags; ++i) { + const skb_frag_t *f = &shi->frags[i]; + unsigned int offset = skb_frag_off(f); + struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT); + + sg_set_page(&sg, page, skb_frag_size(f), + offset_in_page(offset)); + ahash_request_set_crypt(req, &sg, NULL, skb_frag_size(f)); + if (crypto_ahash_update(req)) + return 1; + } + + skb_walk_frags(skb, frag_iter) + if (tcp_sigpool_hash_skb_data(hp, frag_iter, 0)) + return 1; + + return 0; +} +EXPORT_SYMBOL(tcp_sigpool_hash_skb_data); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Per-CPU pool of crypto requests"); diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 7132eb213a7a..7e0c43cb3fd8 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -674,7 +674,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, cmd.tcpm_key, cmd.tcpm_keylen); } -static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, +static int tcp_v6_md5_hash_headers(struct tcp_sigpool *hp, const struct in6_addr *daddr, const struct in6_addr *saddr, const struct tcphdr *th, int nbytes) @@ -695,39 +695,36 @@ static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, _th->check = 0; sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); - ahash_request_set_crypt(hp->md5_req, &sg, NULL, + ahash_request_set_crypt(hp->req, &sg, NULL, sizeof(*bp) + sizeof(*th)); - return crypto_ahash_update(hp->md5_req); + return crypto_ahash_update(hp->req); } static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, const struct in6_addr *daddr, struct in6_addr *saddr, const struct tcphdr *th) { - struct tcp_md5sig_pool *hp; - struct ahash_request *req; + struct tcp_sigpool hp; - hp = tcp_get_md5sig_pool(); - if (!hp) - goto clear_hash_noput; - req = hp->md5_req; + if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp)) + goto clear_hash_nostart; - if (crypto_ahash_init(req)) + if (crypto_ahash_init(hp.req)) goto clear_hash; - if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) + if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, th->doff << 2)) goto clear_hash; - if (tcp_md5_hash_key(hp, key)) + if (tcp_md5_hash_key(&hp, key)) goto clear_hash; - ahash_request_set_crypt(req, NULL, md5_hash, 0); - if (crypto_ahash_final(req)) + ahash_request_set_crypt(hp.req, NULL, md5_hash, 0); + if (crypto_ahash_final(hp.req)) goto clear_hash; - tcp_put_md5sig_pool(); + tcp_sigpool_end(&hp); return 0; clear_hash: - tcp_put_md5sig_pool(); -clear_hash_noput: + tcp_sigpool_end(&hp); +clear_hash_nostart: memset(md5_hash, 0, 16); return 1; } @@ -738,8 +735,7 @@ static int tcp_v6_md5_hash_skb(char *md5_hash, const struct sk_buff *skb) { const struct in6_addr *saddr, *daddr; - struct tcp_md5sig_pool *hp; - struct ahash_request *req; + struct tcp_sigpool hp; const struct tcphdr *th = tcp_hdr(skb); if (sk) { /* valid for establish/request sockets */ @@ -751,30 +747,28 @@ static int tcp_v6_md5_hash_skb(char *md5_hash, daddr = &ip6h->daddr; } - hp = tcp_get_md5sig_pool(); - if (!hp) - goto clear_hash_noput; - req = hp->md5_req; + if (tcp_sigpool_start(tcp_md5_sigpool_id, &hp)) + goto clear_hash_nostart; - if (crypto_ahash_init(req)) + if (crypto_ahash_init(hp.req)) goto clear_hash; - if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) + if (tcp_v6_md5_hash_headers(&hp, daddr, saddr, th, skb->len)) goto clear_hash; - if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) + if (tcp_sigpool_hash_skb_data(&hp, skb, th->doff << 2)) goto clear_hash; - if (tcp_md5_hash_key(hp, key)) + if (tcp_md5_hash_key(&hp, key)) goto clear_hash; - ahash_request_set_crypt(req, NULL, md5_hash, 0); - if (crypto_ahash_final(req)) + ahash_request_set_crypt(hp.req, NULL, md5_hash, 0); + if (crypto_ahash_final(hp.req)) goto clear_hash; - tcp_put_md5sig_pool(); + tcp_sigpool_end(&hp); return 0; clear_hash: - tcp_put_md5sig_pool(); -clear_hash_noput: + tcp_sigpool_end(&hp); +clear_hash_nostart: memset(md5_hash, 0, 16); return 1; } From patchwork Fri May 12 20:22:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239657 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A042523D4E for ; 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Fri, 12 May 2023 13:23:20 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 02/21] net/tcp: Add TCP-AO config and structures Date: Fri, 12 May 2023 21:22:52 +0100 Message-Id: <20230512202311.2845526-3-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Introduce new kernel config option and common structures as well as helpers to be used by TCP-AO code. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/linux/tcp.h | 9 +++- include/net/tcp.h | 8 +--- include/net/tcp_ao.h | 96 ++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/tcp.h | 2 + net/ipv4/Kconfig | 13 ++++++ 5 files changed, 120 insertions(+), 8 deletions(-) create mode 100644 include/net/tcp_ao.h diff --git a/include/linux/tcp.h b/include/linux/tcp.h index b4c08ac86983..673b32e47c30 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -435,13 +435,18 @@ struct tcp_sock { bool syn_smc; /* SYN includes SMC */ #endif -#ifdef CONFIG_TCP_MD5SIG -/* TCP AF-Specific parts; only used by MD5 Signature support so far */ +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) +/* TCP AF-Specific parts; only used by TCP-AO/MD5 Signature support so far */ const struct tcp_sock_af_ops *af_specific; +#ifdef CONFIG_TCP_MD5SIG /* TCP MD5 Signature Option information */ struct tcp_md5sig_info __rcu *md5sig_info; #endif +#ifdef CONFIG_TCP_AO + struct tcp_ao_info __rcu *ao_info; +#endif +#endif /* TCP fastopen related information */ struct tcp_fastopen_request *fastopen_req; diff --git a/include/net/tcp.h b/include/net/tcp.h index b77cc2e0b8e6..b7c974f8f893 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include @@ -1618,12 +1619,7 @@ static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp) tp->retransmit_skb_hint = NULL; } -union tcp_md5_addr { - struct in_addr a4; -#if IS_ENABLED(CONFIG_IPV6) - struct in6_addr a6; -#endif -}; +#define tcp_md5_addr tcp_ao_addr /* - key database */ struct tcp_md5sig_key { diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h new file mode 100644 index 000000000000..234ae371043b --- /dev/null +++ b/include/net/tcp_ao.h @@ -0,0 +1,96 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _TCP_AO_H +#define _TCP_AO_H + +#define TCP_AO_MAX_HASH_SIZE 64 +#define TCP_AO_KEY_ALIGN 1 +#define __tcp_ao_key_align __aligned(TCP_AO_KEY_ALIGN) + +union tcp_ao_addr { + struct in_addr a4; +#if IS_ENABLED(CONFIG_IPV6) + struct in6_addr a6; +#endif +}; + +struct tcp_ao_hdr { + u8 kind; + u8 length; + u8 keyid; + u8 rnext_keyid; +}; + +struct tcp_ao_key { + struct hlist_node node; + union tcp_ao_addr addr; + u8 key[TCP_AO_MAXKEYLEN] __tcp_ao_key_align; + unsigned int tcp_sigpool_id; + u16 port; + u8 prefixlen; + u8 family; + u8 keylen; + u8 keyflags; + u8 sndid; + u8 rcvid; + u8 maclen; + u8 digest_size; + struct rcu_head rcu; + u8 traffic_keys[]; +}; + +static inline u8 *rcv_other_key(struct tcp_ao_key *key) +{ + return key->traffic_keys; +} + +static inline u8 *snd_other_key(struct tcp_ao_key *key) +{ + return key->traffic_keys + key->digest_size; +} + +static inline int tcp_ao_maclen(const struct tcp_ao_key *key) +{ + return key->maclen; +} + +static inline int tcp_ao_sizeof_key(const struct tcp_ao_key *key) +{ + return sizeof(struct tcp_ao_key) + (TCP_AO_MAX_HASH_SIZE << 1); +} + +static inline int tcp_ao_len(const struct tcp_ao_key *key) +{ + return tcp_ao_maclen(key) + sizeof(struct tcp_ao_hdr); +} + +static inline unsigned int tcp_ao_digest_size(struct tcp_ao_key *key) +{ + return key->digest_size; +} + +struct tcp_ao_info { + /* List of tcp_ao_key's */ + struct hlist_head head; + /* current_key and rnext_key aren't maintained on listen sockets. + * Their purpose is to cache keys on established connections, + * saving needless lookups. Never dereference any of them from + * listen sockets. + * ::current_key may change in RX to the key that was requested by + * the peer, please use READ_ONCE()/WRITE_ONCE() in order to avoid + * load/store tearing. + * Do the same for ::rnext_key, if you don't hold socket lock + * (it's changed only by userspace request in setsockopt()). + */ + struct tcp_ao_key *current_key; + struct tcp_ao_key *rnext_key; + u32 flags; + __be32 lisn; + __be32 risn; + u32 snd_sne; + u32 snd_sne_seq; + u32 rcv_sne; + u32 rcv_sne_seq; + struct rcu_head rcu; +}; + +#endif /* _TCP_AO_H */ diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 879eeb0a084b..5655bfe28b8d 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -348,6 +348,8 @@ struct tcp_diag_md5sig { __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; }; +#define TCP_AO_MAXKEYLEN 80 + /* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */ #define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1 diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 89e2ab023272..2bcda91462c8 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -744,6 +744,19 @@ config DEFAULT_TCP_CONG config TCP_SIGPOOL tristate +config TCP_AO + bool "TCP: Authentication Option (RFC5925)" + select CRYPTO + select TCP_SIGPOOL + depends on 64BIT # seq-number extension needs WRITE_ONCE(u64) + help + TCP-AO specifies the use of stronger Message Authentication Codes (MACs), + protects against replays for long-lived TCP connections, and + provides more details on the association of security with TCP + connections than TCP MD5 (See RFC5925) + + If unsure, say N. + config TCP_MD5SIG bool "TCP: MD5 Signature Option support (RFC2385)" select CRYPTO From patchwork Fri May 12 20:22:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239661 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2A4AC1EA87 for ; Fri, 12 May 2023 20:23:29 +0000 (UTC) Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CAC3EA5CA for ; Fri, 12 May 2023 13:23:24 -0700 (PDT) Received: by mail-wm1-x333.google.com with SMTP id 5b1f17b1804b1-3f42ba32e24so34085555e9.3 for ; Fri, 12 May 2023 13:23:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923003; x=1686515003; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=V8VYMkcrVVoR2SgOs07vMhmcImlcQJhssKQR76K7rNY=; b=MbdQmsMul9OTHN4n60aqx2IIJSPVYyk5rkaTU120faYVRtTJ6lm1JmOu4sKsSws+oO Tp2GlfQwDdOLAd/tzBODKlq/nLoWAFvDhDA0AM3j2V1/NUWiW2j1Ts/U8cIGuCk8bt5j csmwbmSLMTIw1opfUR4QLptmMkZiRqAVUFvx+G3juvxequtJPSKVZUGgCJBUyq1ckmmf B1B8yvYOCJZwOhm7PfWIfibHYDUAzCUboz6kAR/GP9wfSjXqdL+23lfH1NQh/6GCMXXL alVzN8xPtJw8Gd2tJDu+rdw6vehLJqFK+dGOLE1oxSNAeTE3dXcjWYX+mUSYLTU3pUqt 7iIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923003; x=1686515003; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=V8VYMkcrVVoR2SgOs07vMhmcImlcQJhssKQR76K7rNY=; b=bn083hD7v2nPSXQlP035mu2zXSmkYhDfEFAq5ARs63AC/QgS4aGPjRZgBGXXE53DcY 1p/7HMFOsvxKVRAHO94XGyFKVA2S60AvMDjJXxCIDL03cQlj9yzDQYDHbRYCoqWnAG8x KKiov2ummJcCpOUbvgfGztfNdDOGyysUU2FSAjOfLo95p9n8JUmo4SUqZAHFNo5G81wd woYzMECocx3KFwXZtdU04S5dsoyPpWf701m4D3C4I9dRFNii2uEv6qEkhLdLpdZKobqi egFR1l+uvHVeg2w46YcB56oCqChmPBjA5yBSgr7f1Ui/FORaBJXo+qD3nAamNW5dNyDo Bvcg== X-Gm-Message-State: AC+VfDxMBuoA52yg2rtlnCrJSCh5/AW3aS2Y79xLGpEcd1be7ymasL66 GrxuLckO0Zvko78/22te8DZ39w== X-Google-Smtp-Source: ACHHUZ5zNTRJY6TtEwjx2arbJmYPCRNGZt+9NlOrH/aNYxJWg96nejJZmZbis6NjdgHg95nj8rfLBw== X-Received: by 2002:a7b:c006:0:b0:3f4:ecdc:5069 with SMTP id c6-20020a7bc006000000b003f4ecdc5069mr4776883wmb.33.1683923003059; Fri, 12 May 2023 13:23:23 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:22 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 03/21] net/tcp: Introduce TCP_AO setsockopt()s Date: Fri, 12 May 2023 21:22:53 +0100 Message-Id: <20230512202311.2845526-4-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Add 3 setsockopt()s: 1. TCP_AO_ADD_KEY to add a new Master Key Tuple (MKT) on a socket 2. TCP_AO_DEL_KEY to delete present MKT from a socket 3. TCP_AO_INFO to change flags, Current_key/RNext_key on a TCP-AO sk Userspace has to introduce keys on every socket it wants to use TCP-AO option on, similarly to TCP_MD5SIG/TCP_MD5SIG_EXT. RFC5925 prohibits definition of MKTs that would match the same peer, so do sanity checks on the data provided by userspace. Be as conservative as possible, including refusal of defining MKT on an established connection with no AO, removing the key in-use and etc. (1) and (2) are to be used by userspace key manager to add/remove keys. (3) main purpose is to set RNext_key, which (as prescribed by RFC5925) is the KeyID that will be requested in TCP-AO header from the peer to sign their segments with. At this moment the life of ao_info ends in tcp_v4_destroy_sock(). Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/linux/sockptr.h | 23 ++ include/net/tcp.h | 6 + include/net/tcp_ao.h | 18 +- include/uapi/linux/tcp.h | 46 +++ net/ipv4/Makefile | 1 + net/ipv4/tcp.c | 17 + net/ipv4/tcp_ao.c | 776 +++++++++++++++++++++++++++++++++++++++ net/ipv4/tcp_ipv4.c | 10 +- net/ipv6/Makefile | 1 + net/ipv6/tcp_ao.c | 20 + net/ipv6/tcp_ipv6.c | 39 +- 11 files changed, 939 insertions(+), 18 deletions(-) create mode 100644 net/ipv4/tcp_ao.c create mode 100644 net/ipv6/tcp_ao.c diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h index bae5e2369b4f..307961b41541 100644 --- a/include/linux/sockptr.h +++ b/include/linux/sockptr.h @@ -55,6 +55,29 @@ static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size) return copy_from_sockptr_offset(dst, src, 0, size); } +static inline int copy_struct_from_sockptr(void *dst, size_t ksize, + sockptr_t src, size_t usize) +{ + size_t size = min(ksize, usize); + size_t rest = max(ksize, usize) - size; + + if (!sockptr_is_kernel(src)) + return copy_struct_from_user(dst, ksize, src.user, size); + + if (usize < ksize) { + memset(dst + size, 0, rest); + } else if (usize > ksize) { + char *p = src.kernel; + + while (rest--) { + if (*p++) + return -E2BIG; + } + } + memcpy(dst, src.kernel, size); + return 0; +} + static inline int copy_to_sockptr_offset(sockptr_t dst, size_t offset, const void *src, size_t size) { diff --git a/include/net/tcp.h b/include/net/tcp.h index b7c974f8f893..e0ceb7168c6e 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2094,6 +2094,12 @@ struct tcp_sock_af_ops { sockptr_t optval, int optlen); #endif +#ifdef CONFIG_TCP_AO + int (*ao_parse)(struct sock *sk, + int optname, + sockptr_t optval, + int optlen); +#endif }; struct tcp_request_sock_ops { diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 234ae371043b..916df79450e0 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -83,7 +83,8 @@ struct tcp_ao_info { */ struct tcp_ao_key *current_key; struct tcp_ao_key *rnext_key; - u32 flags; + u32 ao_required :1, + __unused :31; __be32 lisn; __be32 risn; u32 snd_sne; @@ -93,4 +94,19 @@ struct tcp_ao_info { struct rcu_head rcu; }; +#ifdef CONFIG_TCP_AO +int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, + sockptr_t optval, int optlen); +void tcp_ao_destroy_sock(struct sock *sk); +/* ipv4 specific functions */ +int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen); +/* ipv6 specific functions */ +int tcp_v6_parse_ao(struct sock *sk, int cmd, + sockptr_t optval, int optlen); +#else +static inline void tcp_ao_destroy_sock(struct sock *sk) +{ +} +#endif + #endif /* _TCP_AO_H */ diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 5655bfe28b8d..250e0ce2cc38 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -129,6 +129,9 @@ enum { #define TCP_TX_DELAY 37 /* delay outgoing packets by XX usec */ +#define TCP_AO_ADD_KEY 38 /* Add/Set MKT */ +#define TCP_AO_DEL_KEY 39 /* Delete MKT */ +#define TCP_AO_INFO 40 /* Modify TCP-AO per-socket options */ #define TCP_REPAIR_ON 1 #define TCP_REPAIR_OFF 0 @@ -350,6 +353,49 @@ struct tcp_diag_md5sig { #define TCP_AO_MAXKEYLEN 80 +#define TCP_AO_KEYF_IFINDEX (1 << 0) /* L3 ifindex for VRF */ + +struct tcp_ao_add { /* setsockopt(TCP_AO_ADD_KEY) */ + struct __kernel_sockaddr_storage addr; /* peer's address for the key */ + char alg_name[64]; /* crypto hash algorithm to use */ + __s32 ifindex; /* L3 dev index for VRF */ + __u32 set_current :1, /* set key as Current_key at once */ + set_rnext :1, /* request it from peer with RNext_key */ + reserved :30; /* must be 0 */ + __u16 reserved2; /* padding, must be 0 */ + __u8 prefix; /* peer's address prefix */ + __u8 sndid; /* SendID for outgoing segments */ + __u8 rcvid; /* RecvID to match for incoming seg */ + __u8 maclen; /* length of authentication code (hash) */ + __u8 keyflags; /* see TCP_AO_KEYF_ */ + __u8 keylen; /* length of ::key */ + __u8 key[TCP_AO_MAXKEYLEN]; +} __attribute__((aligned(8))); + +struct tcp_ao_del { /* setsockopt(TCP_AO_DEL_KEY) */ + struct __kernel_sockaddr_storage addr; /* peer's address for the key */ + __s32 ifindex; /* L3 dev index for VRF */ + __u32 set_current :1, /* corresponding ::current_key */ + set_rnext :1, /* corresponding ::rnext */ + reserved :30; /* must be 0 */ + __u16 reserved2; /* padding, must be 0 */ + __u8 prefix; /* peer's address prefix */ + __u8 sndid; /* SendID for outgoing segments */ + __u8 rcvid; /* RecvID to match for incoming seg */ + __u8 current_key; /* KeyID to set as Current_key */ + __u8 rnext; /* KeyID to set as Rnext_key */ + __u8 keyflags; /* see TCP_AO_KEYF_ */ +} __attribute__((aligned(8))); + +struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO) */ + __u32 set_current :1, /* corresponding ::current_key */ + set_rnext :1, /* corresponding ::rnext */ + ao_required :1, /* don't accept non-AO connects */ + reserved :29; /* must be 0 */ + __u8 current_key; /* KeyID to set as Current_key */ + __u8 rnext; /* KeyID to set as Rnext_key */ +} __attribute__((aligned(8))); + /* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */ #define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1 diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile index cd760793cfcb..e144a02a6a61 100644 --- a/net/ipv4/Makefile +++ b/net/ipv4/Makefile @@ -69,6 +69,7 @@ obj-$(CONFIG_NETLABEL) += cipso_ipv4.o obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \ xfrm4_output.o xfrm4_protocol.o +obj-$(CONFIG_TCP_AO) += tcp_ao.o ifeq ($(CONFIG_BPF_JIT),y) obj-$(CONFIG_BPF_SYSCALL) += bpf_tcp_ca.o diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 4ab77d02aef2..fa94d5c416b0 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3717,6 +3717,23 @@ int do_tcp_setsockopt(struct sock *sk, int level, int optname, __tcp_sock_set_quickack(sk, val); break; +#ifdef CONFIG_TCP_AO + case TCP_AO_ADD_KEY: + case TCP_AO_DEL_KEY: + case TCP_AO_INFO: { + /* If this is the first TCP-AO setsockopt() on the socket, + * sk_state has to be LISTEN or CLOSE + */ + if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) || + rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk))) + err = tp->af_specific->ao_parse(sk, optname, optval, + optlen); + else + err = -EISCONN; + break; + } +#endif #ifdef CONFIG_TCP_MD5SIG case TCP_MD5SIG: case TCP_MD5SIG_EXT: diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c new file mode 100644 index 000000000000..9c16bd8e4989 --- /dev/null +++ b/net/ipv4/tcp_ao.c @@ -0,0 +1,776 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * INET An implementation of the TCP Authentication Option (TCP-AO). + * See RFC5925. + * + * Authors: Dmitry Safonov + * Francesco Ruggeri + * Salam Noureddine + */ +#define pr_fmt(fmt) "TCP: " fmt + +#include +#include +#include + +#include +#include + +/* Optimized version of tcp_ao_do_lookup(): only for sockets for which + * it's known that the keys in ao_info are matching peer's + * family/address/port/VRF/etc. + */ +static struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, + int sndid, int rcvid) +{ + struct tcp_ao_key *key; + + hlist_for_each_entry_rcu(key, &ao->head, node) { + if ((sndid >= 0 && key->sndid != sndid) || + (rcvid >= 0 && key->rcvid != rcvid)) + continue; + return key; + } + + return NULL; +} + +static inline int ipv4_prefix_cmp(const struct in_addr *addr1, + const struct in_addr *addr2, + unsigned int prefixlen) +{ + __be32 mask = inet_make_mask(prefixlen); + + if ((addr1->s_addr & mask) == (addr2->s_addr & mask)) + return 0; + return ((addr1->s_addr & mask) > (addr2->s_addr & mask)) ? 1 : -1; +} + +static int __tcp_ao_key_cmp(const struct tcp_ao_key *key, + const union tcp_ao_addr *addr, u8 prefixlen, + int family, int sndid, int rcvid, u16 port) +{ + if (sndid >= 0 && key->sndid != sndid) + return (key->sndid > sndid) ? 1 : -1; + if (rcvid >= 0 && key->rcvid != rcvid) + return (key->rcvid > rcvid) ? 1 : -1; + if (port != 0 && key->port != 0 && port != key->port) + return (key->port > port) ? 1 : -1; + + if (family == AF_UNSPEC) + return 0; + if (key->family != family) + return (key->family > family) ? 1 : -1; + + if (family == AF_INET) { + if (key->addr.a4.s_addr == INADDR_ANY) + return 0; + if (addr->a4.s_addr == INADDR_ANY) + return 0; + return ipv4_prefix_cmp(&key->addr.a4, &addr->a4, prefixlen); +#if IS_ENABLED(CONFIG_IPV6) + } else { + if (ipv6_addr_any(&key->addr.a6) || ipv6_addr_any(&addr->a6)) + return 0; + if (ipv6_prefix_equal(&key->addr.a6, &addr->a6, prefixlen)) + return 0; + return memcmp(&key->addr.a6, &addr->a6, prefixlen); +#endif + } + return -1; +} + +static int tcp_ao_key_cmp(const struct tcp_ao_key *key, + const union tcp_ao_addr *addr, u8 prefixlen, + int family, int sndid, int rcvid, u16 port) +{ +#if IS_ENABLED(CONFIG_IPV6) + if (family == AF_INET6 && ipv6_addr_v4mapped(&addr->a6)) { + __be32 addr4 = addr->a6.s6_addr32[3]; + + return __tcp_ao_key_cmp(key, (union tcp_ao_addr *)&addr4, + prefixlen, AF_INET, sndid, rcvid, port); + } +#endif + return __tcp_ao_key_cmp(key, addr, prefixlen, family, sndid, rcvid, port); +} + +static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk, + const union tcp_ao_addr *addr, int family, u8 prefix, + int sndid, int rcvid, u16 port) +{ + struct tcp_ao_key *key; + struct tcp_ao_info *ao; + + ao = rcu_dereference_check(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (!ao) + return NULL; + + hlist_for_each_entry_rcu(key, &ao->head, node) { + u8 prefixlen = min(prefix, key->prefixlen); + + if (!tcp_ao_key_cmp(key, addr, prefixlen, + family, sndid, rcvid, port)) + return key; + } + return NULL; +} + +struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, + const union tcp_ao_addr *addr, + int family, int sndid, int rcvid, u16 port) +{ + return __tcp_ao_do_lookup(sk, addr, family, U8_MAX, + sndid, rcvid, port); +} +EXPORT_SYMBOL_GPL(tcp_ao_do_lookup); + +static struct tcp_ao_info *tcp_ao_alloc_info(gfp_t flags) +{ + struct tcp_ao_info *ao; + + ao = kzalloc(sizeof(*ao), flags); + if (!ao) + return NULL; + INIT_HLIST_HEAD(&ao->head); + + return ao; +} + +static void tcp_ao_link_mkt(struct tcp_ao_info *ao, struct tcp_ao_key *mkt) +{ + hlist_add_head_rcu(&mkt->node, &ao->head); +} + +static void tcp_ao_key_free_rcu(struct rcu_head *head) +{ + struct tcp_ao_key *key = container_of(head, struct tcp_ao_key, rcu); + + tcp_sigpool_release(key->tcp_sigpool_id); + kfree(key); +} + +void tcp_ao_destroy_sock(struct sock *sk) +{ + struct tcp_ao_info *ao; + struct tcp_ao_key *key; + struct hlist_node *n; + + ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1); + tcp_sk(sk)->ao_info = NULL; + + if (!ao) + return; + + hlist_for_each_entry_safe(key, n, &ao->head, node) { + hlist_del_rcu(&key->node); + atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc); + call_rcu(&key->rcu, tcp_ao_key_free_rcu); + } + + kfree_rcu(ao, rcu); +} + +static bool tcp_ao_can_set_current_rnext(struct sock *sk) +{ + /* There aren't current/rnext keys on TCP_LISTEN sockets */ + if (sk->sk_state == TCP_LISTEN) + return false; + return true; +} + +static int tcp_ao_verify_port(struct sock *sk, u16 port) +{ + struct inet_sock *inet = inet_sk(sk); + + if (port != 0) /* FIXME */ + return -EINVAL; + + /* Check that MKT port is consistent with socket */ + if (port != 0 && inet->inet_dport != 0 && port != inet->inet_dport) + return -EINVAL; + + return 0; +} + +static int tcp_ao_verify_ipv4(struct sock *sk, struct tcp_ao_add *cmd, + union tcp_ao_addr **addr, u16 *port) +{ + struct sockaddr_in *sin = (struct sockaddr_in *)&cmd->addr; + struct inet_sock *inet = inet_sk(sk); + + if (sin->sin_family != AF_INET) + return -EINVAL; + + if (tcp_ao_verify_port(sk, ntohs(sin->sin_port))) + return -EINVAL; + + /* Check prefix and trailing 0's in addr */ + if (cmd->prefix != 0) { + __be32 mask; + + if (sin->sin_addr.s_addr == INADDR_ANY) + return -EINVAL; + if (cmd->prefix > 32) + return -EINVAL; + + mask = inet_make_mask(cmd->prefix); + if (sin->sin_addr.s_addr & ~mask) + return -EINVAL; + + /* Check that MKT address is consistent with socket */ + if (inet->inet_daddr != INADDR_ANY && + (inet->inet_daddr & mask) != sin->sin_addr.s_addr) + return -EINVAL; + } else { + if (sin->sin_addr.s_addr != INADDR_ANY) + return -EINVAL; + } + + *addr = (union tcp_ao_addr *)&sin->sin_addr; + *port = ntohs(sin->sin_port); + return 0; +} + +static int tcp_ao_parse_crypto(struct tcp_ao_add *cmd, struct tcp_ao_key *key) +{ + unsigned int syn_tcp_option_space; + bool is_kdf_aes_128_cmac = false; + struct tcp_sigpool hp; + struct crypto_ahash *tfm; + int err, pool_id; + + /* Force null-termination of alg_name */ + cmd->alg_name[ARRAY_SIZE(cmd->alg_name) - 1] = '\0'; + + /* RFC5926, 3.1.1.2. KDF_AES_128_CMAC */ + if (!strcmp("cmac(aes128)", cmd->alg_name)) { + strcpy(cmd->alg_name, "cmac(aes)"); + is_kdf_aes_128_cmac = (cmd->keylen != 16); + } + + key->maclen = cmd->maclen ?: 12; /* 12 is the default in RFC5925 */ + + /* Check: maclen + tcp-ao header <= (MAX_TCP_OPTION_SPACE - mss + * - tstamp - wscale - sackperm), + * see tcp_syn_options(), tcp_synack_options(), commit 33ad798c924b. + * + * In order to allow D-SACK with TCP-AO, the header size should be: + * (MAX_TCP_OPTION_SPACE - TCPOLEN_TSTAMP_ALIGNED + * - TCPOLEN_SACK_BASE_ALIGNED + * - 2 * TCPOLEN_SACK_PERBLOCK) = 8 (maclen = 4), + * see tcp_established_options(). + * + * RFC5925, 2.2: + * Typical MACs are 96-128 bits (12-16 bytes), but any length + * that fits in the header of the segment being authenticated + * is allowed. + * + * RFC5925, 7.6: + * TCP-AO continues to consume 16 bytes in non-SYN segments, + * leaving a total of 24 bytes for other options, of which + * the timestamp consumes 10. This leaves 14 bytes, of which 10 + * are used for a single SACK block. When two SACK blocks are used, + * such as to handle D-SACK, a smaller TCP-AO MAC would be required + * to make room for the additional SACK block (i.e., to leave 18 + * bytes for the D-SACK variant of the SACK option) [RFC2883]. + * Note that D-SACK is not supportable in TCP MD5 in the presence + * of timestamps, because TCP MD5’s MAC length is fixed and too + * large to leave sufficient option space. + */ + syn_tcp_option_space = MAX_TCP_OPTION_SPACE; + syn_tcp_option_space -= TCPOLEN_TSTAMP_ALIGNED; + syn_tcp_option_space -= TCPOLEN_WSCALE_ALIGNED; + syn_tcp_option_space -= TCPOLEN_SACKPERM_ALIGNED; + if (tcp_ao_len(key) > syn_tcp_option_space) + return -EMSGSIZE; + + key->keylen = cmd->keylen; + memcpy(key->key, cmd->key, cmd->keylen); + + /* Full TCP header (th->doff << 2) should fit into scratch area, + * see tcp_ao_hash_header(). + */ + pool_id = tcp_sigpool_alloc_ahash(cmd->alg_name, 60); + if (pool_id < 0) + return pool_id; + + err = tcp_sigpool_start(pool_id, &hp); + if (err) + goto err_free_pool; + + tfm = crypto_ahash_reqtfm(hp.req); + if (crypto_ahash_alignmask(tfm) > TCP_AO_KEY_ALIGN) { + err = -EOPNOTSUPP; + goto err_pool_end; + } + + if (is_kdf_aes_128_cmac) { + void *scratch = hp.scratch; + struct scatterlist sg; + + /* Using zero-key of 16 bytes as described in RFC5926 */ + memset(scratch, 0, 16); + sg_init_one(&sg, cmd->key, cmd->keylen); + + err = crypto_ahash_setkey(tfm, scratch, 16); + if (err) + goto err_pool_end; + + err = crypto_ahash_init(hp.req); + if (err) + goto err_pool_end; + + ahash_request_set_crypt(hp.req, &sg, key->key, cmd->keylen); + err = crypto_ahash_update(hp.req); + if (err) + goto err_pool_end; + + err |= crypto_ahash_final(hp.req); + if (err) + goto err_pool_end; + key->keylen = 16; + } + + err = crypto_ahash_setkey(tfm, key->key, key->keylen); + if (err) + goto err_pool_end; + + key->digest_size = crypto_ahash_digestsize(tfm); + tcp_sigpool_end(&hp); + + /* TODO: remove TCP_AO_MAX_HASH_SIZE in favor of dynamically + * allocated buffer. + */ + if (key->digest_size > TCP_AO_MAX_HASH_SIZE) { + err = -ENOBUFS; + goto err_free_pool; + } + if (tcp_ao_maclen(key) > key->digest_size) { + err = -EINVAL; + goto err_free_pool; + } + + key->tcp_sigpool_id = pool_id; + return 0; + +err_pool_end: + tcp_sigpool_end(&hp); +err_free_pool: + tcp_sigpool_release(pool_id); + return err; +} + +#if IS_ENABLED(CONFIG_IPV6) +static int tcp_ao_verify_ipv6(struct sock *sk, struct tcp_ao_add *cmd, + union tcp_ao_addr **paddr, u16 *port, + unsigned short int *family) +{ + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd->addr; + struct in6_addr *addr = &sin6->sin6_addr; + u8 prefix = cmd->prefix; + + if (sin6->sin6_family != AF_INET6) + return -EINVAL; + /* Not supposed to happen: here from af-specific callback */ + if (WARN_ON_ONCE(!sk_fullsock(sk))) + return -EINVAL; + + if (tcp_ao_verify_port(sk, ntohs(sin6->sin6_port))) + return -EINVAL; + + /* Check prefix and trailing 0's in addr */ + if (cmd->prefix != 0 && ipv6_addr_v4mapped(addr)) { + __be32 addr4 = addr->s6_addr32[3]; + __be32 mask; + + if (prefix > 32 || addr4 == INADDR_ANY) + return -EINVAL; + + mask = inet_make_mask(prefix); + if (addr4 & ~mask) + return -EINVAL; + + /* Check that MKT address is consistent with socket */ + if (!ipv6_addr_any(&sk->sk_v6_daddr)) { + __be32 daddr4 = sk->sk_v6_daddr.s6_addr32[3]; + + if (!ipv6_addr_v4mapped(&sk->sk_v6_daddr)) + return -EINVAL; + if ((daddr4 & mask) != addr4) + return -EINVAL; + } + + *paddr = (union tcp_ao_addr *)&addr->s6_addr32[3]; + *family = AF_INET; + *port = ntohs(sin6->sin6_port); + return 0; + } else if (cmd->prefix != 0) { + struct in6_addr pfx; + + if (ipv6_addr_any(addr) || prefix > 128) + return -EINVAL; + + ipv6_addr_prefix(&pfx, addr, prefix); + if (ipv6_addr_cmp(&pfx, addr)) + return -EINVAL; + + /* Check that MKT address is consistent with socket */ + if (!ipv6_addr_any(&sk->sk_v6_daddr) && + !ipv6_prefix_equal(&sk->sk_v6_daddr, addr, prefix)) + + return -EINVAL; + } else { + if (!ipv6_addr_any(addr)) + return -EINVAL; + } + + *paddr = (union tcp_ao_addr *)addr; + *port = ntohs(sin6->sin6_port); + return 0; +} +#else +static inline int tcp_ao_verify_ipv6(struct sock *sk, struct tcp_ao_add *cmd, + union tcp_ao_addr **paddr, u16 *port, + unsigned short int *family) +{ + return -EOPNOTSUPP; +} +#endif + +#define TCP_AO_KEYF_ALL (0) + +static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, + sockptr_t optval, int optlen) +{ + struct tcp_ao_info *ao_info; + union tcp_ao_addr *addr; + struct tcp_ao_key *key; + struct tcp_ao_add cmd; + bool first = false; + int ret, size; + u16 port; + + if (optlen < sizeof(cmd)) + return -EINVAL; + + ret = copy_struct_from_sockptr(&cmd, sizeof(cmd), optval, optlen); + if (ret) + return ret; + + if (cmd.keylen > TCP_AO_MAXKEYLEN) + return -EINVAL; + + if (cmd.reserved != 0 || cmd.reserved2 != 0) + return -EINVAL; + + if (family == AF_INET) + ret = tcp_ao_verify_ipv4(sk, &cmd, &addr, &port); + else + ret = tcp_ao_verify_ipv6(sk, &cmd, &addr, &port, &family); + if (ret) + return ret; + + if (cmd.keyflags & ~TCP_AO_KEYF_ALL) + return -EINVAL; + + if (cmd.set_current || cmd.set_rnext) { + if (!tcp_ao_can_set_current_rnext(sk)) + return -EINVAL; + } + + ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + + if (!ao_info) { + ao_info = tcp_ao_alloc_info(GFP_KERNEL); + if (!ao_info) + return -ENOMEM; + first = true; + } else { + /* Check that neither RecvID nor SendID match any + * existing key for the peer, RFC5925 3.1: + * > The IDs of MKTs MUST NOT overlap where their + * > TCP connection identifiers overlap. + */ + if (__tcp_ao_do_lookup(sk, addr, family, + cmd.prefix, -1, cmd.rcvid, port)) + return -EEXIST; + if (__tcp_ao_do_lookup(sk, addr, family, + cmd.prefix, cmd.sndid, -1, port)) + return -EEXIST; + } + + /* TODO: We should add twice the key->diget_size instead of the max + * so rework this in a way to know the digest_size before allocating + * the tcp_ao_key struct. + */ + size = sizeof(struct tcp_ao_key) + (TCP_AO_MAX_HASH_SIZE << 1); + key = sock_kmalloc(sk, size, GFP_KERNEL); + if (!key) { + ret = -ENOMEM; + goto err_free_ao; + } + + INIT_HLIST_NODE(&key->node); + memcpy(&key->addr, addr, (family == AF_INET) ? sizeof(struct in_addr) : + sizeof(struct in6_addr)); + key->port = port; + key->prefixlen = cmd.prefix; + key->family = family; + key->keyflags = cmd.keyflags; + key->sndid = cmd.sndid; + key->rcvid = cmd.rcvid; + + ret = tcp_ao_parse_crypto(&cmd, key); + if (ret < 0) + goto err_free_sock; + + tcp_ao_link_mkt(ao_info, key); + if (first) { + sk_gso_disable(sk); + rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info); + } + + if (cmd.set_current) + WRITE_ONCE(ao_info->current_key, key); + if (cmd.set_rnext) + WRITE_ONCE(ao_info->rnext_key, key); + return 0; + +err_free_sock: + atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc); + kfree(key); +err_free_ao: + if (first) + kfree(ao_info); + return ret; +} + +static int tcp_ao_delete_key(struct sock *sk, struct tcp_ao_info *ao_info, + struct tcp_ao_key *key, + struct tcp_ao_key *new_current, + struct tcp_ao_key *new_rnext) +{ + int err; + + hlist_del_rcu(&key->node); + + /* At this moment another CPU could have looked this key up + * while it was unlinked from the list. Wait for RCU grace period, + * after which the key is off-list and can't be looked up again; + * the rx path [just before RCU came] might have used it and set it + * as current_key (very unlikely). + */ + synchronize_rcu(); + if (new_current) + WRITE_ONCE(ao_info->current_key, new_current); + if (new_rnext) + WRITE_ONCE(ao_info->rnext_key, new_rnext); + + if (unlikely(READ_ONCE(ao_info->current_key) == key || + READ_ONCE(ao_info->rnext_key) == key)) { + err = -EBUSY; + goto add_key; + } + + atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc); + call_rcu(&key->rcu, tcp_ao_key_free_rcu); + + return 0; +add_key: + hlist_add_head_rcu(&key->node, &ao_info->head); + return err; +} + +static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family, + sockptr_t optval, int optlen) +{ + struct tcp_ao_key *key, *new_current = NULL, *new_rnext = NULL; + struct tcp_ao_info *ao_info; + union tcp_ao_addr *addr; + struct tcp_ao_del cmd; + int err; + __u8 prefix; + __be16 port; + int addr_len; + + if (optlen < sizeof(cmd)) + return -EINVAL; + + err = copy_struct_from_sockptr(&cmd, sizeof(cmd), optval, optlen); + if (err) + return err; + + if (cmd.reserved != 0 || cmd.reserved2 != 0) + return -EINVAL; + + if (cmd.set_current || cmd.set_rnext) { + if (!tcp_ao_can_set_current_rnext(sk)) + return -EINVAL; + } + + ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (!ao_info) + return -ENOENT; + + /* For sockets in TCP_CLOSED it's possible set keys that aren't + * matching the future peer (address/port/VRF/etc), + * tcp_ao_connect_init() will choose a correct matching MKT + * if there's any. + */ + if (cmd.set_current) { + new_current = tcp_ao_established_key(ao_info, cmd.current_key, -1); + if (!new_current) + return -ENOENT; + } + if (cmd.set_rnext) { + new_rnext = tcp_ao_established_key(ao_info, -1, cmd.rnext); + if (!new_rnext) + return -ENOENT; + } + + if (family == AF_INET) { + struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.addr; + + addr = (union tcp_ao_addr *)&sin->sin_addr; + addr_len = sizeof(struct in_addr); + port = ntohs(sin->sin_port); + } else { + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.addr; + struct in6_addr *addr6 = &sin6->sin6_addr; + + if (ipv6_addr_v4mapped(addr6)) { + addr = (union tcp_ao_addr *)&addr6->s6_addr32[3]; + addr_len = sizeof(struct in_addr); + family = AF_INET; + } else { + addr = (union tcp_ao_addr *)addr6; + addr_len = sizeof(struct in6_addr); + } + port = ntohs(sin6->sin6_port); + } + prefix = cmd.prefix; + + /* We could choose random present key here for current/rnext + * but that's less predictable. Let's be strict and don't + * allow removing a key that's in use. RFC5925 doesn't + * specify how-to coordinate key removal, but says: + * "It is presumed that an MKT affecting a particular + * connection cannot be destroyed during an active connection" + */ + hlist_for_each_entry_rcu(key, &ao_info->head, node) { + if (cmd.sndid != key->sndid || + cmd.rcvid != key->rcvid) + continue; + + if (family != key->family || + prefix != key->prefixlen || + port != key->port || + memcmp(addr, &key->addr, addr_len)) + continue; + + if (key == new_current || key == new_rnext) + continue; + + return tcp_ao_delete_key(sk, ao_info, key, + new_current, new_rnext); + } + return -ENOENT; +} + +static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, + sockptr_t optval, int optlen) +{ + struct tcp_ao_info *ao_info; + struct tcp_ao_key *new_current = NULL, *new_rnext = NULL; + struct tcp_ao_info_opt cmd; + bool first = false; + int err; + + if (optlen < sizeof(cmd)) + return -EINVAL; + + err = copy_struct_from_sockptr(&cmd, sizeof(cmd), optval, optlen); + if (err) + return err; + + if (cmd.set_current || cmd.set_rnext) { + if (!tcp_ao_can_set_current_rnext(sk)) + return -EINVAL; + } + + if (cmd.reserved != 0) + return -EINVAL; + + ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (!ao_info) { + ao_info = tcp_ao_alloc_info(GFP_KERNEL); + if (!ao_info) + return -ENOMEM; + first = true; + } + + /* For sockets in TCP_CLOSED it's possible set keys that aren't + * matching the future peer (address/port/VRF/etc), + * tcp_ao_connect_init() will choose a correct matching MKT + * if there's any. + */ + if (cmd.set_current) { + new_current = tcp_ao_established_key(ao_info, cmd.current_key, -1); + if (!new_current) { + err = -ENOENT; + goto out; + } + } + if (cmd.set_rnext) { + new_rnext = tcp_ao_established_key(ao_info, -1, cmd.rnext); + if (!new_rnext) { + err = -ENOENT; + goto out; + } + } + + ao_info->ao_required = cmd.ao_required; + if (new_current) + WRITE_ONCE(ao_info->current_key, new_current); + if (new_rnext) + WRITE_ONCE(ao_info->rnext_key, new_rnext); + if (first) { + sk_gso_disable(sk); + rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info); + } + return 0; +out: + if (first) + kfree(ao_info); + return err; +} + +int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, + sockptr_t optval, int optlen) +{ + if (WARN_ON_ONCE(family != AF_INET && family != AF_INET6)) + return -EAFNOSUPPORT; + + switch (cmd) { + case TCP_AO_ADD_KEY: + return tcp_ao_add_cmd(sk, family, optval, optlen); + case TCP_AO_DEL_KEY: + return tcp_ao_del_cmd(sk, family, optval, optlen); + case TCP_AO_INFO: + return tcp_ao_info_cmd(sk, family, optval, optlen); + default: + WARN_ON_ONCE(1); + return -EINVAL; + } +} + +int tcp_v4_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen) +{ + return tcp_parse_ao(sk, cmd, AF_INET, optval, optlen); +} + diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index c6fd2e071e4a..f505347d795c 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2261,11 +2261,16 @@ const struct inet_connection_sock_af_ops ipv4_specific = { }; EXPORT_SYMBOL(ipv4_specific); -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { +#ifdef CONFIG_TCP_MD5SIG .md5_lookup = tcp_v4_md5_lookup, .calc_md5_hash = tcp_v4_md5_hash_skb, .md5_parse = tcp_v4_parse_md5_keys, +#endif +#ifdef CONFIG_TCP_AO + .ao_parse = tcp_v4_parse_ao, +#endif }; #endif @@ -2280,7 +2285,7 @@ static int tcp_v4_init_sock(struct sock *sk) icsk->icsk_af_ops = &ipv4_specific; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; #endif @@ -2331,6 +2336,7 @@ void tcp_v4_destroy_sock(struct sock *sk) rcu_assign_pointer(tp->md5sig_info, NULL); } #endif + tcp_ao_destroy_sock(sk); /* Clean up a referenced TCP bind bucket. */ if (inet_csk(sk)->icsk_bind_hash) diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile index 3036a45e8a1e..d283c59df4c1 100644 --- a/net/ipv6/Makefile +++ b/net/ipv6/Makefile @@ -52,4 +52,5 @@ obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o ifneq ($(CONFIG_IPV6),) obj-$(CONFIG_NET_UDP_TUNNEL) += ip6_udp_tunnel.o obj-y += mcast_snoop.o +obj-$(CONFIG_TCP_AO) += tcp_ao.o endif diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c new file mode 100644 index 000000000000..d0aa6414b7d9 --- /dev/null +++ b/net/ipv6/tcp_ao.c @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * INET An implementation of the TCP Authentication Option (TCP-AO). + * See RFC5925. + * + * Authors: Dmitry Safonov + * Francesco Ruggeri + * Salam Noureddine + */ +#include + +#include +#include + +int tcp_v6_parse_ao(struct sock *sk, int cmd, + sockptr_t optval, int optlen) +{ + return tcp_parse_ao(sk, cmd, AF_INET6, optval, optlen); +} +EXPORT_SYMBOL_GPL(tcp_v6_parse_ao); diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 7e0c43cb3fd8..84e69d5f2f81 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -76,16 +76,9 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); static const struct inet_connection_sock_af_ops ipv6_mapped; const struct inet_connection_sock_af_ops ipv6_specific; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; -#else -static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, - const struct in6_addr *addr, - int l3index) -{ - return NULL; -} #endif /* Helper returning the inet6 address from a given tcp socket. @@ -243,7 +236,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, if (sk_is_mptcp(sk)) mptcpv6_handle_mapped(sk, true); sk->sk_backlog_rcv = tcp_v4_do_rcv; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) tp->af_specific = &tcp_sock_ipv6_mapped_specific; #endif @@ -256,7 +249,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, if (sk_is_mptcp(sk)) mptcpv6_handle_mapped(sk, false); sk->sk_backlog_rcv = tcp_v6_do_rcv; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) tp->af_specific = &tcp_sock_ipv6_specific; #endif goto failure; @@ -772,7 +765,13 @@ static int tcp_v6_md5_hash_skb(char *md5_hash, memset(md5_hash, 0, 16); return 1; } - +#else /* CONFIG_TCP_MD5SIG */ +static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, + const struct in6_addr *addr, + int l3index) +{ + return NULL; +} #endif static void tcp_v6_init_req(struct request_sock *req, @@ -1232,7 +1231,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff * if (sk_is_mptcp(newsk)) mptcpv6_handle_mapped(newsk, true); newsk->sk_backlog_rcv = tcp_v4_do_rcv; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) newtp->af_specific = &tcp_sock_ipv6_mapped_specific; #endif @@ -1896,11 +1895,16 @@ const struct inet_connection_sock_af_ops ipv6_specific = { .mtu_reduced = tcp_v6_mtu_reduced, }; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { +#ifdef CONFIG_TCP_MD5SIG .md5_lookup = tcp_v6_md5_lookup, .calc_md5_hash = tcp_v6_md5_hash_skb, .md5_parse = tcp_v6_parse_md5_keys, +#endif +#ifdef CONFIG_TCP_AO + .ao_parse = tcp_v6_parse_ao, +#endif }; #endif @@ -1922,11 +1926,16 @@ static const struct inet_connection_sock_af_ops ipv6_mapped = { .mtu_reduced = tcp_v4_mtu_reduced, }; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { +#ifdef CONFIG_TCP_MD5SIG .md5_lookup = tcp_v4_md5_lookup, .calc_md5_hash = tcp_v4_md5_hash_skb, .md5_parse = tcp_v6_parse_md5_keys, +#endif +#ifdef CONFIG_TCP_AO + .ao_parse = tcp_v6_parse_ao, +#endif }; #endif @@ -1941,7 +1950,7 @@ static int tcp_v6_init_sock(struct sock *sk) icsk->icsk_af_ops = &ipv6_specific; -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; #endif From patchwork Fri May 12 20:22:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239660 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C17631EA65 for ; Fri, 12 May 2023 20:23:28 +0000 (UTC) Received: from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com [IPv6:2a00:1450:4864:20::32e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4543F5FD3 for ; Fri, 12 May 2023 13:23:26 -0700 (PDT) Received: by mail-wm1-x32e.google.com with SMTP id 5b1f17b1804b1-3f42b984405so34455835e9.3 for ; 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Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 04/21] net/tcp: Prevent TCP-MD5 with TCP-AO being set Date: Fri, 12 May 2023 21:22:54 +0100 Message-Id: <20230512202311.2845526-5-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Be as conservative as possible: if there is TCP-MD5 key for a given peer regardless of L3 interface - don't allow setting TCP-AO key for the same peer. According to RFC5925, TCP-AO is supposed to replace TCP-MD5 and there can't be any switch between both on any connected tuple. Later it can be relaxed, if there's a use, but in the beginning restrict any intersection. Note: it's still should be possible to set both TCP-MD5 and TCP-AO keys on a listening socket for *different* peers. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 43 +++++++++++++++++++++++++++++++++++++-- include/net/tcp_ao.h | 15 ++++++++++++++ net/ipv4/tcp_ao.c | 40 ++++++++++++++++++++++++++++++++++++ net/ipv4/tcp_ipv4.c | 14 ++++++++++--- net/ipv4/tcp_output.c | 47 +++++++++++++++++++++++++++++++++++++++++++ net/ipv6/tcp_ao.c | 18 +++++++++++++++++ net/ipv6/tcp_ipv6.c | 26 ++++++++++++++++++++---- 7 files changed, 194 insertions(+), 9 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index e0ceb7168c6e..8f9e7100d20f 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1705,6 +1705,7 @@ int tcp_md5_key_copy(struct sock *sk, const union tcp_md5_addr *addr, int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family, u8 prefixlen, int l3index, u8 flags); +void tcp_clear_md5_list(struct sock *sk); struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, const struct sock *addr_sk); @@ -1713,14 +1714,23 @@ struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk, extern struct static_key_false_deferred tcp_md5_needed; struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index, const union tcp_md5_addr *addr, - int family); + int family, bool any_l3index); static inline struct tcp_md5sig_key * tcp_md5_do_lookup(const struct sock *sk, int l3index, const union tcp_md5_addr *addr, int family) { if (!static_branch_unlikely(&tcp_md5_needed.key)) return NULL; - return __tcp_md5_do_lookup(sk, l3index, addr, family); + return __tcp_md5_do_lookup(sk, l3index, addr, family, false); +} + +static inline struct tcp_md5sig_key * +tcp_md5_do_lookup_any_l3index(const struct sock *sk, + const union tcp_md5_addr *addr, int family) +{ + if (!static_branch_unlikely(&tcp_md5_needed.key)) + return NULL; + return __tcp_md5_do_lookup(sk, 0, addr, family, true); } enum skb_drop_reason @@ -1738,6 +1748,13 @@ tcp_md5_do_lookup(const struct sock *sk, int l3index, return NULL; } +static inline struct tcp_md5sig_key * +tcp_md5_do_lookup_any_l3index(const struct sock *sk, + const union tcp_md5_addr *addr, int family) +{ + return NULL; +} + static inline enum skb_drop_reason tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, const void *saddr, const void *daddr, @@ -2099,6 +2116,9 @@ struct tcp_sock_af_ops { int optname, sockptr_t optval, int optlen); + struct tcp_ao_key *(*ao_lookup)(const struct sock *sk, + struct sock *addr_sk, + int sndid, int rcvid); #endif }; @@ -2503,4 +2523,23 @@ static inline u64 tcp_transmit_time(const struct sock *sk) return 0; } +static inline bool tcp_ao_required(struct sock *sk, const void *saddr, + int family) +{ +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao_info; + struct tcp_ao_key *ao_key; + + ao_info = rcu_dereference_check(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (!ao_info) + return false; + + ao_key = tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0); + if (ao_info->ao_required || ao_key) + return true; +#endif + return false; +} + #endif /* _TCP_H */ diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 916df79450e0..73f584b499f6 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -98,12 +98,27 @@ struct tcp_ao_info { int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, sockptr_t optval, int optlen); void tcp_ao_destroy_sock(struct sock *sk); +struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, + const union tcp_ao_addr *addr, + int family, int sndid, int rcvid, u16 port); /* ipv4 specific functions */ int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen); +struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, + int sndid, int rcvid); /* ipv6 specific functions */ +struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, + struct sock *addr_sk, + int sndid, int rcvid); int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen); #else +static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, + const union tcp_ao_addr *addr, + int family, int sndid, int rcvid, u16 port) +{ + return NULL; +} + static inline void tcp_ao_destroy_sock(struct sock *sk) { } diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 9c16bd8e4989..8f103b9193be 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -172,6 +172,14 @@ void tcp_ao_destroy_sock(struct sock *sk) kfree_rcu(ao, rcu); } +struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, + int sndid, int rcvid) +{ + union tcp_ao_addr *addr = (union tcp_ao_addr *)&addr_sk->sk_daddr; + + return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0); +} + static bool tcp_ao_can_set_current_rnext(struct sock *sk) { /* There aren't current/rnext keys on TCP_LISTEN sockets */ @@ -480,6 +488,10 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, return -EINVAL; } + /* Don't allow keys for peers that have a matching TCP-MD5 key */ + if (tcp_md5_do_lookup_any_l3index(sk, addr, family)) + return -EKEYREJECTED; + ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); @@ -681,6 +693,31 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family, return -ENOENT; } +/* cmd.ao_required makes a socket TCP-AO only. + * Don't allow any md5 keys for any l3intf on the socket together with it. + * Restricting it early in setsockopt() removes a check for + * ao_info->ao_required on inbound tcp segment fast-path. + */ +static inline int tcp_ao_required_verify(struct sock *sk) +{ +#ifdef CONFIG_TCP_MD5SIG + const struct tcp_md5sig_info *md5sig; + + if (!static_branch_unlikely(&tcp_md5_needed.key)) + return 0; + + md5sig = rcu_dereference_check(tcp_sk(sk)->md5sig_info, + lockdep_sock_is_held(sk)); + if (!md5sig) + return 0; + + if (rcu_dereference_check(hlist_first_rcu(&md5sig->head), + lockdep_sock_is_held(sk))) + return 1; +#endif + return 0; +} + static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, sockptr_t optval, int optlen) { @@ -714,6 +751,9 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, first = true; } + if (cmd.ao_required && tcp_ao_required_verify(sk)) + return -EKEYREJECTED; + /* For sockets in TCP_CLOSED it's possible set keys that aren't * matching the future peer (address/port/VRF/etc), * tcp_ao_connect_init() will choose a correct matching MKT diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index f505347d795c..f5867336f3c1 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1073,7 +1073,7 @@ static bool better_md5_match(struct tcp_md5sig_key *old, struct tcp_md5sig_key * /* Find the Key structure for an address. */ struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index, const union tcp_md5_addr *addr, - int family) + int family, bool any_l3index) { const struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_key *key; @@ -1092,7 +1092,8 @@ struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index, lockdep_sock_is_held(sk)) { if (key->family != family) continue; - if (key->flags & TCP_MD5SIG_FLAG_IFINDEX && key->l3index != l3index) + if (!any_l3index && key->flags & TCP_MD5SIG_FLAG_IFINDEX && + key->l3index != l3index) continue; if (family == AF_INET) { mask = inet_make_mask(key->prefixlen); @@ -1304,7 +1305,7 @@ int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family, } EXPORT_SYMBOL(tcp_md5_do_del); -static void tcp_clear_md5_list(struct sock *sk) +void tcp_clear_md5_list(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_key *key; @@ -1374,6 +1375,12 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) return -EINVAL; + /* Don't allow keys for peers that have a matching TCP-AO key. + * See the comment in tcp_ao_add_cmd() + */ + if (tcp_ao_required(sk, addr, AF_INET)) + return -EKEYREJECTED; + return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags, cmd.tcpm_key, cmd.tcpm_keylen); } @@ -2269,6 +2276,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { .md5_parse = tcp_v4_parse_md5_keys, #endif #ifdef CONFIG_TCP_AO + .ao_lookup = tcp_v4_ao_lookup, .ao_parse = tcp_v4_parse_ao, #endif }; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index cfe128b81a01..324b241e95bc 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -3839,6 +3839,53 @@ int tcp_connect(struct sock *sk) tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_CONNECT_CB, 0, NULL); +#if defined(CONFIG_TCP_MD5SIG) && defined(CONFIG_TCP_AO) + /* Has to be checked late, after setting daddr/saddr/ops. + * Return error if the peer has both a md5 and a tcp-ao key + * configured as this is ambiguous. + */ + if (unlikely(rcu_dereference_protected(tp->md5sig_info, + lockdep_sock_is_held(sk)))) { + bool needs_md5 = !!tp->af_specific->md5_lookup(sk, sk); + bool needs_ao = !!tp->af_specific->ao_lookup(sk, sk, -1, -1); + struct tcp_ao_info *ao_info; + + ao_info = rcu_dereference_check(tp->ao_info, + lockdep_sock_is_held(sk)); + if (ao_info) { + /* This is an extra check: tcp_ao_required() in + * tcp_v{4,6}_parse_md5_keys() should prevent adding + * md5 keys on ao_required socket. + */ + needs_ao |= ao_info->ao_required; + WARN_ON_ONCE(ao_info->ao_required && needs_md5); + } + if (needs_md5 && needs_ao) + return -EKEYREJECTED; + + /* If we have a matching md5 key and no matching tcp-ao key + * then free up ao_info if allocated. + */ + if (needs_md5) { + tcp_ao_destroy_sock(sk); + } else if (needs_ao) { + tcp_clear_md5_list(sk); + kfree(rcu_replace_pointer(tp->md5sig_info, NULL, + lockdep_sock_is_held(sk))); + } + } +#endif +#ifdef CONFIG_TCP_AO + if (unlikely(rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held(sk)))) { + /* Don't allow connecting if ao is configured but no + * matching key is found. + */ + if (!tp->af_specific->ao_lookup(sk, sk, -1, -1)) + return -EKEYREJECTED; + } +#endif + if (inet_csk(sk)->icsk_af_ops->rebuild_header(sk)) return -EHOSTUNREACH; /* Routing failure or similar. */ diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c index d0aa6414b7d9..3d2be5f73cf0 100644 --- a/net/ipv6/tcp_ao.c +++ b/net/ipv6/tcp_ao.c @@ -12,6 +12,24 @@ #include #include +struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk, + const struct in6_addr *addr, + int sndid, int rcvid) +{ + return tcp_ao_do_lookup(sk, (union tcp_ao_addr *)addr, AF_INET6, + sndid, rcvid, 0); +} + +struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, + struct sock *addr_sk, + int sndid, int rcvid) +{ + struct in6_addr *addr = &addr_sk->sk_v6_daddr; + + return tcp_v6_ao_do_lookup(sk, addr, sndid, rcvid); +} +EXPORT_SYMBOL_GPL(tcp_v6_ao_lookup); + int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen) { diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 84e69d5f2f81..a946a3a66a92 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -603,6 +603,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, { struct tcp_md5sig cmd; struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; + union tcp_ao_addr *addr; int l3index = 0; u8 prefixlen; u8 flags; @@ -657,13 +658,28 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) return -EINVAL; - if (ipv6_addr_v4mapped(&sin6->sin6_addr)) - return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], + if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { + addr = (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3]; + + /* Don't allow keys for peers that have a matching TCP-AO key. + * See the comment in tcp_ao_add_cmd() + */ + if (tcp_ao_required(sk, addr, AF_INET)) + return -EKEYREJECTED; + return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags, cmd.tcpm_key, cmd.tcpm_keylen); + } - return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, - AF_INET6, prefixlen, l3index, flags, + addr = (union tcp_md5_addr *)&sin6->sin6_addr; + + /* Don't allow keys for peers that have a matching TCP-AO key. + * See the comment in tcp_ao_add_cmd() + */ + if (tcp_ao_required(sk, addr, AF_INET6)) + return -EKEYREJECTED; 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Fri, 12 May 2023 13:23:25 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 05/21] net/tcp: Calculate TCP-AO traffic keys Date: Fri, 12 May 2023 21:22:55 +0100 Message-Id: <20230512202311.2845526-6-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Add traffic key calculation the way it's described in RFC5926. Wire it up to tcp_finish_connect() and cache the new keys straight away on already established TCP connections. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 5 ++ include/net/tcp_ao.h | 42 ++++++++- net/ipv4/tcp_ao.c | 196 ++++++++++++++++++++++++++++++++++++++++++ net/ipv4/tcp_input.c | 1 + net/ipv4/tcp_ipv4.c | 1 + net/ipv4/tcp_output.c | 1 + net/ipv6/tcp_ao.c | 40 +++++++++ net/ipv6/tcp_ipv6.c | 1 + 8 files changed, 286 insertions(+), 1 deletion(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 8f9e7100d20f..7ae5341f7ee3 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2119,6 +2119,11 @@ struct tcp_sock_af_ops { struct tcp_ao_key *(*ao_lookup)(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); + int (*ao_calc_key_sk)(struct tcp_ao_key *mkt, + u8 *key, + const struct sock *sk, + __be32 sisn, __be32 disn, + bool send); #endif }; diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 73f584b499f6..1172d9d9517a 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -95,8 +95,30 @@ struct tcp_ao_info { }; #ifdef CONFIG_TCP_AO +/* TCP-AO structures and functions */ + +struct tcp4_ao_context { + __be32 saddr; + __be32 daddr; + __be16 sport; + __be16 dport; + __be32 sisn; + __be32 disn; +}; + +struct tcp6_ao_context { + struct in6_addr saddr; + struct in6_addr daddr; + __be16 sport; + __be16 dport; + __be32 sisn; + __be32 disn; +}; + int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, sockptr_t optval, int optlen); +int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, + unsigned int len); void tcp_ao_destroy_sock(struct sock *sk); struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, @@ -105,13 +127,23 @@ struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen); struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); +int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, + const struct sock *sk, + __be32 sisn, __be32 disn, bool send); /* ipv6 specific functions */ +int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, + const struct sock *sk, __be32 sisn, + __be32 disn, bool send); struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen); -#else +void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb); +void tcp_ao_connect_init(struct sock *sk); + +#else /* CONFIG_TCP_AO */ + static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port) @@ -122,6 +154,14 @@ static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, static inline void tcp_ao_destroy_sock(struct sock *sk) { } + +static inline void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb) +{ +} + +static inline void tcp_ao_connect_init(struct sock *sk) +{ +} #endif #endif /* _TCP_AO_H */ diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 8f103b9193be..c3bc90c12f49 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -16,6 +16,42 @@ #include #include +int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, + unsigned int len) +{ + struct tcp_sigpool hp; + struct scatterlist sg; + int ret; + + if (tcp_sigpool_start(mkt->tcp_sigpool_id, &hp)) + goto clear_hash_noput; + + if (crypto_ahash_setkey(crypto_ahash_reqtfm(hp.req), + mkt->key, mkt->keylen)) + goto clear_hash; + + ret = crypto_ahash_init(hp.req); + if (ret) + goto clear_hash; + + sg_init_one(&sg, ctx, len); + ahash_request_set_crypt(hp.req, &sg, key, len); + crypto_ahash_update(hp.req); + + /* TODO: Revisit on how to get different output length */ + ret = crypto_ahash_final(hp.req); + if (ret) + goto clear_hash; + + tcp_sigpool_end(&hp); + return 0; +clear_hash: + tcp_sigpool_end(&hp); +clear_hash_noput: + memset(key, 0, tcp_ao_digest_size(mkt)); + return 1; +} + /* Optimized version of tcp_ao_do_lookup(): only for sockets for which * it's known that the keys in ao_info are matching peer's * family/address/port/VRF/etc. @@ -172,6 +208,62 @@ void tcp_ao_destroy_sock(struct sock *sk) kfree_rcu(ao, rcu); } +/* 4 tuple and ISNs are expected in NBO */ +static int tcp_v4_ao_calc_key(struct tcp_ao_key *mkt, u8 *key, + __be32 saddr, __be32 daddr, + __be16 sport, __be16 dport, + __be32 sisn, __be32 disn) +{ + /* See RFC5926 3.1.1 */ + struct kdf_input_block { + u8 counter; + u8 label[6]; + struct tcp4_ao_context ctx; + __be16 outlen; + } __packed tmp; + + tmp.counter = 1; + memcpy(tmp.label, "TCP-AO", 6); + tmp.ctx.saddr = saddr; + tmp.ctx.daddr = daddr; + tmp.ctx.sport = sport; + tmp.ctx.dport = dport; + tmp.ctx.sisn = sisn; + tmp.ctx.disn = disn; + tmp.outlen = htons(tcp_ao_digest_size(mkt) * 8); /* in bits */ + + return tcp_ao_calc_traffic_key(mkt, key, &tmp, sizeof(tmp)); +} + +int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, + const struct sock *sk, + __be32 sisn, __be32 disn, bool send) +{ + if (send) + return tcp_v4_ao_calc_key(mkt, key, sk->sk_rcv_saddr, + sk->sk_daddr, htons(sk->sk_num), + sk->sk_dport, sisn, disn); + else + return tcp_v4_ao_calc_key(mkt, key, sk->sk_daddr, + sk->sk_rcv_saddr, sk->sk_dport, + htons(sk->sk_num), disn, sisn); +} +EXPORT_SYMBOL_GPL(tcp_v4_ao_calc_key_sk); + +static int tcp_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, + const struct sock *sk, + __be32 sisn, __be32 disn, bool send) +{ + if (mkt->family == AF_INET) + return tcp_v4_ao_calc_key_sk(mkt, key, sk, sisn, disn, send); +#if IS_ENABLED(CONFIG_IPV6) + else if (mkt->family == AF_INET6) + return tcp_v6_ao_calc_key_sk(mkt, key, sk, sisn, disn, send); +#endif + else + return -EOPNOTSUPP; +} + struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid) { @@ -180,6 +272,104 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0); } +static int tcp_ao_cache_traffic_keys(const struct sock *sk, + struct tcp_ao_info *ao, + struct tcp_ao_key *ao_key) +{ + u8 *traffic_key = snd_other_key(ao_key); + int ret; + + ret = tcp_ao_calc_key_sk(ao_key, traffic_key, sk, + ao->lisn, ao->risn, true); + if (ret) + return ret; + + traffic_key = rcv_other_key(ao_key); + ret = tcp_ao_calc_key_sk(ao_key, traffic_key, sk, + ao->lisn, ao->risn, false); + return ret; +} + +void tcp_ao_connect_init(struct sock *sk) +{ + struct tcp_ao_info *ao_info; + struct tcp_ao_key *key; + struct tcp_sock *tp = tcp_sk(sk); + union tcp_ao_addr *addr; + int family; + + ao_info = rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held(sk)); + if (!ao_info) + return; + + /* Remove all keys that don't match the peer */ + family = sk->sk_family; + if (family == AF_INET) + addr = (union tcp_ao_addr *)&sk->sk_daddr; +#if IS_ENABLED(CONFIG_IPV6) + else if (family == AF_INET6) + addr = (union tcp_ao_addr *)&sk->sk_v6_daddr; +#endif + else + return; + + hlist_for_each_entry_rcu(key, &ao_info->head, node) { + if (tcp_ao_key_cmp(key, addr, key->prefixlen, family, + -1, -1, sk->sk_dport) == 0) + continue; + + if (key == ao_info->current_key) + ao_info->current_key = NULL; + if (key == ao_info->rnext_key) + ao_info->rnext_key = NULL; + hlist_del_rcu(&key->node); + tcp_sigpool_release(key->tcp_sigpool_id); + atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc); + kfree_rcu(key, rcu); + } + + key = tp->af_specific->ao_lookup(sk, sk, -1, -1); + if (key) { + /* if current_key or rnext_key were not provided, + * use the first key matching the peer + */ + if (!ao_info->current_key) + ao_info->current_key = key; + if (!ao_info->rnext_key) + ao_info->rnext_key = key; + tp->tcp_header_len += tcp_ao_len(key); + + ao_info->lisn = htonl(tp->write_seq); + ao_info->snd_sne = 0; + ao_info->snd_sne_seq = tp->write_seq; + } else { + /* TODO: probably, it should fail to connect() here */ + rcu_assign_pointer(tp->ao_info, NULL); + kfree(ao_info); + } +} + +void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb) +{ + struct tcp_ao_info *ao; + struct tcp_ao_key *key; + + ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (!ao) + return; + + ao->risn = tcp_hdr(skb)->seq; + + ao->rcv_sne = 0; + ao->rcv_sne_seq = ntohl(tcp_hdr(skb)->seq); + + hlist_for_each_entry_rcu(key, &ao->head, node) { + tcp_ao_cache_traffic_keys(sk, ao, key); + } +} + static bool tcp_ao_can_set_current_rnext(struct sock *sk) { /* There aren't current/rnext keys on TCP_LISTEN sockets */ @@ -539,6 +729,12 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, if (ret < 0) goto err_free_sock; + /* Change this condition if we allow adding keys in states + * like close_wait, syn_sent or fin_wait... + */ + if (sk->sk_state == TCP_ESTABLISHED) + tcp_ao_cache_traffic_keys(sk, ao_info, key); + tcp_ao_link_mkt(ao_info, key); if (first) { sk_gso_disable(sk); diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 61b6710f337a..2a9010b4ac8c 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -6066,6 +6066,7 @@ void tcp_finish_connect(struct sock *sk, struct sk_buff *skb) struct tcp_sock *tp = tcp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); + tcp_ao_finish_connect(sk, skb); tcp_set_state(sk, TCP_ESTABLISHED); icsk->icsk_ack.lrcvtime = tcp_jiffies32; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index f5867336f3c1..6d2b46c689ff 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2278,6 +2278,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v4_ao_lookup, .ao_parse = tcp_v4_parse_ao, + .ao_calc_key_sk = tcp_v4_ao_calc_key_sk, #endif }; #endif diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 324b241e95bc..5e680e69fc0a 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -3663,6 +3663,7 @@ static void tcp_connect_init(struct sock *sk) if (tp->af_specific->md5_lookup(sk, sk)) tp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED; #endif + tcp_ao_connect_init(sk); /* If user gave his TCP_MAXSEG, record it to clamp */ if (tp->rx_opt.user_mss) diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c index 3d2be5f73cf0..2be0103fc4f8 100644 --- a/net/ipv6/tcp_ao.c +++ b/net/ipv6/tcp_ao.c @@ -12,6 +12,46 @@ #include #include +static int tcp_v6_ao_calc_key(struct tcp_ao_key *mkt, u8 *key, + const struct in6_addr *saddr, + const struct in6_addr *daddr, + __be16 sport, __be16 dport, + __be32 sisn, __be32 disn) +{ + struct kdf_input_block { + u8 counter; + u8 label[6]; + struct tcp6_ao_context ctx; + __be16 outlen; + } __packed tmp; + + tmp.counter = 1; + memcpy(tmp.label, "TCP-AO", 6); + tmp.ctx.saddr = *saddr; + tmp.ctx.daddr = *daddr; + tmp.ctx.sport = sport; + tmp.ctx.dport = dport; + tmp.ctx.sisn = sisn; + tmp.ctx.disn = disn; + tmp.outlen = htons(tcp_ao_digest_size(mkt) * 8); /* in bits */ + + return tcp_ao_calc_traffic_key(mkt, key, &tmp, sizeof(tmp)); +} + +int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, + const struct sock *sk, __be32 sisn, + __be32 disn, bool send) +{ + if (send) + return tcp_v6_ao_calc_key(mkt, key, &sk->sk_v6_rcv_saddr, + &sk->sk_v6_daddr, htons(sk->sk_num), + sk->sk_dport, sisn, disn); + else + return tcp_v6_ao_calc_key(mkt, key, &sk->sk_v6_daddr, + &sk->sk_v6_rcv_saddr, sk->sk_dport, + htons(sk->sk_num), disn, sisn); +} + struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk, const struct in6_addr *addr, int sndid, int rcvid) diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index a946a3a66a92..e47151af9d42 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1921,6 +1921,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v6_ao_lookup, .ao_parse = tcp_v6_parse_ao, + .ao_calc_key_sk = tcp_v6_ao_calc_key_sk, #endif }; 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Fri, 12 May 2023 13:23:27 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:27 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 06/21] net/tcp: Add TCP-AO sign to outgoing packets Date: Fri, 12 May 2023 21:22:56 +0100 Message-Id: <20230512202311.2845526-7-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Using precalculated traffic keys, sign TCP segments as prescribed by RFC5925. Per RFC, TCP header options are included in sign calculation: "The TCP header, by default including options, and where the TCP checksum and TCP-AO MAC fields are set to zero, all in network- byte order." (5.1.3) tcp_ao_hash_header() has exclude_options parameter to optionally exclude TCP header from hash calculation, as described in RFC5925 (9.1), this is needed for interaction with middleboxes that may change "some TCP options". This is wired up to AO key flags and setsockopt() later. Similarly to TCP-MD5 hash TCP segment fragments. >From this moment a user can start sending TCP-AO signed segments with one of crypto ahash algorithms from supported by Linux kernel. It can have a user-specified MAC length, to either save TCP option header space or provide higher protection using a longer signature. The inbound segments are not yet verified, TCP-AO option is ignored and they are accepted. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 7 ++ include/net/tcp_ao.h | 15 ++++ net/ipv4/tcp_ao.c | 177 ++++++++++++++++++++++++++++++++++++++++++ net/ipv4/tcp_ipv4.c | 1 + net/ipv4/tcp_output.c | 120 +++++++++++++++++++++++++--- net/ipv6/tcp_ao.c | 29 +++++++ net/ipv6/tcp_ipv6.c | 2 + 7 files changed, 341 insertions(+), 10 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 7ae5341f7ee3..50d255ac3500 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -187,6 +187,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo); #define TCPOPT_SACK 5 /* SACK Block */ #define TCPOPT_TIMESTAMP 8 /* Better RTT estimations/PAWS */ #define TCPOPT_MD5SIG 19 /* MD5 Signature (RFC2385) */ +#define TCPOPT_AO 29 /* Authentication Option (RFC5925) */ #define TCPOPT_MPTCP 30 /* Multipath TCP (RFC6824) */ #define TCPOPT_FASTOPEN 34 /* Fast open (RFC7413) */ #define TCPOPT_EXP 254 /* Experimental */ @@ -2119,6 +2120,12 @@ struct tcp_sock_af_ops { struct tcp_ao_key *(*ao_lookup)(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); + int (*calc_ao_hash)(char *location, + struct tcp_ao_key *ao, + const struct sock *sk, + const struct sk_buff *skb, + const u8 *tkey, + int hash_offset, u32 sne); int (*ao_calc_key_sk)(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 1172d9d9517a..ee32af145bba 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -115,11 +115,16 @@ struct tcp6_ao_context { __be32 disn; }; +int tcp_ao_hash_skb(unsigned short int family, + char *ao_hash, struct tcp_ao_key *key, + const struct sock *sk, const struct sk_buff *skb, + const u8 *tkey, int hash_offset, u32 sne); int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, sockptr_t optval, int optlen); int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, unsigned int len); void tcp_ao_destroy_sock(struct sock *sk); +u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq); struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port); @@ -130,13 +135,23 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, __be32 sisn, __be32 disn, bool send); +int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, + const struct sock *sk, const struct sk_buff *skb, + const u8 *tkey, int hash_offset, u32 sne); /* ipv6 specific functions */ +struct tcp_sigpool; +int tcp_v6_ao_hash_pseudoheader(struct tcp_sigpool *hp, + const struct in6_addr *daddr, + const struct in6_addr *saddr, int nbytes); int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, __be32 sisn, __be32 disn, bool send); struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); +int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, + const struct sock *sk, const struct sk_buff *skb, + const u8 *tkey, int hash_offset, u32 sne); int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen); void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb); diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index c3bc90c12f49..7708c994ff45 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -264,6 +264,183 @@ static int tcp_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, return -EOPNOTSUPP; } +static int tcp_v4_ao_hash_pseudoheader(struct tcp_sigpool *hp, + __be32 daddr, __be32 saddr, + int nbytes) +{ + struct tcp4_pseudohdr *bp; + struct scatterlist sg; + + bp = hp->scratch; + bp->saddr = saddr; + bp->daddr = daddr; + bp->pad = 0; + bp->protocol = IPPROTO_TCP; + bp->len = cpu_to_be16(nbytes); + + sg_init_one(&sg, bp, sizeof(*bp)); + ahash_request_set_crypt(hp->req, &sg, NULL, sizeof(*bp)); + return crypto_ahash_update(hp->req); +} + +static int tcp_ao_hash_pseudoheader(unsigned short int family, + const struct sock *sk, + const struct sk_buff *skb, + struct tcp_sigpool *hp, int nbytes) +{ + const struct tcphdr *th = tcp_hdr(skb); + + /* TODO: Can we rely on checksum being zero to mean outbound pkt? */ + if (!th->check) { + if (family == AF_INET) + return tcp_v4_ao_hash_pseudoheader(hp, sk->sk_daddr, + sk->sk_rcv_saddr, skb->len); +#if IS_ENABLED(CONFIG_IPV6) + else if (family == AF_INET6) + return tcp_v6_ao_hash_pseudoheader(hp, &sk->sk_v6_daddr, + &sk->sk_v6_rcv_saddr, skb->len); +#endif + else + return -EAFNOSUPPORT; + } + + if (family == AF_INET) { + const struct iphdr *iph = ip_hdr(skb); + + return tcp_v4_ao_hash_pseudoheader(hp, iph->daddr, + iph->saddr, skb->len); +#if IS_ENABLED(CONFIG_IPV6) + } else if (family == AF_INET6) { + const struct ipv6hdr *iph = ipv6_hdr(skb); + + return tcp_v6_ao_hash_pseudoheader(hp, &iph->daddr, + &iph->saddr, skb->len); +#endif + } + return -EAFNOSUPPORT; +} + +u32 tcp_ao_compute_sne(u32 prev_sne, u32 prev_seq, u32 seq) +{ + u32 sne = prev_sne; + + if (before(seq, prev_seq)) { + if (seq > prev_seq) + sne--; + } else { + if (seq < prev_seq) + sne++; + } + + return sne; +} +EXPORT_SYMBOL_GPL(tcp_ao_compute_sne); + +/* tcp_ao_hash_sne(struct tcp_sigpool *hp) + * @hp - used for hashing + * @sne - sne value + */ +static int tcp_ao_hash_sne(struct tcp_sigpool *hp, u32 sne) +{ + struct scatterlist sg; + __be32 *bp; + + bp = (__be32 *)hp->scratch; + *bp = htonl(sne); + + sg_init_one(&sg, bp, sizeof(*bp)); + ahash_request_set_crypt(hp->req, &sg, NULL, sizeof(*bp)); + return crypto_ahash_update(hp->req); +} + +static int tcp_ao_hash_header(struct tcp_sigpool *hp, + const struct tcphdr *th, + bool exclude_options, u8 *hash, + int hash_offset, int hash_len) +{ + struct scatterlist sg; + u8 *hdr = hp->scratch; + int err, len = th->doff << 2; + + /* We are not allowed to change tcphdr, make a local copy */ + if (exclude_options) { + len = sizeof(*th) + sizeof(struct tcp_ao_hdr) + hash_len; + memcpy(hdr, th, sizeof(*th)); + memcpy(hdr + sizeof(*th), + (u8 *)th + hash_offset - sizeof(struct tcp_ao_hdr), + sizeof(struct tcp_ao_hdr)); + memset(hdr + sizeof(*th) + sizeof(struct tcp_ao_hdr), + 0, hash_len); + ((struct tcphdr *)hdr)->check = 0; + } else { + len = th->doff << 2; + memcpy(hdr, th, len); + /* zero out tcp-ao hash */ + ((struct tcphdr *)hdr)->check = 0; + memset(hdr + hash_offset, 0, hash_len); + } + + sg_init_one(&sg, hdr, len); + ahash_request_set_crypt(hp->req, &sg, NULL, len); + err = crypto_ahash_update(hp->req); + WARN_ON_ONCE(err != 0); + return err; +} + +int tcp_ao_hash_skb(unsigned short int family, + char *ao_hash, struct tcp_ao_key *key, + const struct sock *sk, const struct sk_buff *skb, + const u8 *tkey, int hash_offset, u32 sne) +{ + const struct tcphdr *th = tcp_hdr(skb); + int tkey_len = tcp_ao_digest_size(key); + __u8 tmp_hash[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + struct tcp_sigpool hp; + + if (tcp_sigpool_start(key->tcp_sigpool_id, &hp)) + goto clear_hash_noput; + + if (crypto_ahash_setkey(crypto_ahash_reqtfm(hp.req), tkey, tkey_len)) + goto clear_hash; + + /* For now use sha1 by default. Depends on alg in tcp_ao_key */ + if (crypto_ahash_init(hp.req)) + goto clear_hash; + + if (tcp_ao_hash_sne(&hp, sne)) + goto clear_hash; + if (tcp_ao_hash_pseudoheader(family, sk, skb, &hp, skb->len)) + goto clear_hash; + if (tcp_ao_hash_header(&hp, th, false, + ao_hash, hash_offset, tcp_ao_maclen(key))) + goto clear_hash; + if (tcp_sigpool_hash_skb_data(&hp, skb, th->doff << 2)) + goto clear_hash; + ahash_request_set_crypt(hp.req, NULL, tmp_hash, 0); + if (crypto_ahash_final(hp.req)) + goto clear_hash; + + memcpy(ao_hash, tmp_hash, tcp_ao_maclen(key)); + tcp_sigpool_end(&hp); + return 0; + +clear_hash: + tcp_sigpool_end(&hp); +clear_hash_noput: + memset(ao_hash, 0, tcp_ao_maclen(key)); + return 1; +} +EXPORT_SYMBOL_GPL(tcp_ao_hash_skb); + +int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, + const struct sock *sk, const struct sk_buff *skb, + const u8 *tkey, int hash_offset, u32 sne) +{ + return tcp_ao_hash_skb(AF_INET, ao_hash, key, sk, skb, + tkey, hash_offset, sne); +} +EXPORT_SYMBOL_GPL(tcp_v4_ao_hash_skb); + struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid) { diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 6d2b46c689ff..bd9b9118e1f0 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2277,6 +2277,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { #endif #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v4_ao_lookup, + .calc_ao_hash = tcp_v4_ao_hash_skb, .ao_parse = tcp_v4_parse_ao, .ao_calc_key_sk = tcp_v4_ao_calc_key_sk, #endif diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 5e680e69fc0a..d4c7ca5d5cf1 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -413,6 +413,7 @@ static inline bool tcp_urg_mode(const struct tcp_sock *tp) #define OPTION_FAST_OPEN_COOKIE BIT(8) #define OPTION_SMC BIT(9) #define OPTION_MPTCP BIT(10) +#define OPTION_AO BIT(11) static void smc_options_write(__be32 *ptr, u16 *options) { @@ -605,7 +606,8 @@ static void bpf_skops_write_hdr_opt(struct sock *sk, struct sk_buff *skb, * (but it may well be that other scenarios fail similarly). */ static void tcp_options_write(struct tcphdr *th, struct tcp_sock *tp, - struct tcp_out_options *opts) + struct tcp_out_options *opts, + struct tcp_ao_key *ao_key) { __be32 *ptr = (__be32 *)(th + 1); u16 options = opts->options; /* mungable copy */ @@ -617,7 +619,33 @@ static void tcp_options_write(struct tcphdr *th, struct tcp_sock *tp, opts->hash_location = (__u8 *)ptr; ptr += 4; } +#ifdef CONFIG_TCP_AO + if (unlikely(OPTION_AO & options) && tp) { + struct tcp_ao_key *rnext_key; + struct tcp_ao_info *ao_info; + u8 maclen; + if (WARN_ON_ONCE(!ao_key)) + goto out_ao; + ao_info = rcu_dereference_check(tp->ao_info, + lockdep_sock_is_held(&tp->inet_conn.icsk_inet.sk)); + rnext_key = READ_ONCE(ao_info->rnext_key); + if (WARN_ON_ONCE(!rnext_key)) + goto out_ao; + maclen = tcp_ao_maclen(ao_key); + *ptr++ = htonl((TCPOPT_AO << 24) | + (tcp_ao_len(ao_key) << 16) | + (ao_key->sndid << 8) | + (rnext_key->rcvid)); + opts->hash_location = (__u8 *)ptr; + ptr += maclen / sizeof(*ptr); + if (unlikely(maclen % sizeof(*ptr))) { + memset(ptr, TCPOPT_NOP, sizeof(*ptr)); + ptr++; + } + } +out_ao: +#endif if (unlikely(opts->mss)) { *ptr++ = htonl((TCPOPT_MSS << 24) | (TCPOLEN_MSS << 16) | @@ -758,7 +786,8 @@ static void mptcp_set_option_cond(const struct request_sock *req, */ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb, struct tcp_out_options *opts, - struct tcp_md5sig_key **md5) + struct tcp_md5sig_key **md5, + struct tcp_ao_key *ao_key) { struct tcp_sock *tp = tcp_sk(sk); unsigned int remaining = MAX_TCP_OPTION_SPACE; @@ -775,6 +804,12 @@ static unsigned int tcp_syn_options(struct sock *sk, struct sk_buff *skb, } } #endif +#ifdef CONFIG_TCP_AO + if (ao_key) { + opts->options |= OPTION_AO; + remaining -= tcp_ao_len(ao_key); + } +#endif /* We always get an MSS option. The option bytes which will be seen in * normal data packets should timestamps be used, must be in the MSS @@ -842,6 +877,7 @@ static unsigned int tcp_synack_options(const struct sock *sk, unsigned int mss, struct sk_buff *skb, struct tcp_out_options *opts, const struct tcp_md5sig_key *md5, + const struct tcp_ao_key *ao, struct tcp_fastopen_cookie *foc, enum tcp_synack_type synack_type, struct sk_buff *syn_skb) @@ -863,6 +899,14 @@ static unsigned int tcp_synack_options(const struct sock *sk, ireq->tstamp_ok &= !ireq->sack_ok; } #endif +#ifdef CONFIG_TCP_AO + if (ao) { + opts->options |= OPTION_AO; + remaining -= tcp_ao_len(ao); + ireq->tstamp_ok &= !ireq->sack_ok; + } +#endif + WARN_ON_ONCE(md5 && ao); /* We always send an MSS option. */ opts->mss = mss; @@ -912,7 +956,8 @@ static unsigned int tcp_synack_options(const struct sock *sk, */ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb, struct tcp_out_options *opts, - struct tcp_md5sig_key **md5) + struct tcp_md5sig_key **md5, + struct tcp_ao_key *ao_key) { struct tcp_sock *tp = tcp_sk(sk); unsigned int size = 0; @@ -931,6 +976,12 @@ static unsigned int tcp_established_options(struct sock *sk, struct sk_buff *skb } } #endif +#ifdef CONFIG_TCP_AO + if (ao_key) { + opts->options |= OPTION_AO; + size += tcp_ao_len(ao_key); + } +#endif if (likely(tp->rx_opt.tstamp_ok)) { opts->options |= OPTION_TS; @@ -1242,6 +1293,10 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, unsigned int tcp_options_size, tcp_header_size; struct sk_buff *oskb = NULL; struct tcp_md5sig_key *md5; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; +#endif + struct tcp_ao_key *ao_key = NULL; struct tcphdr *th; u64 prior_wstamp; int err; @@ -1273,11 +1328,17 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, tcb = TCP_SKB_CB(skb); memset(&opts, 0, sizeof(opts)); +#ifdef CONFIG_TCP_AO + ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (ao) + ao_key = READ_ONCE(ao->current_key); +#endif if (unlikely(tcb->tcp_flags & TCPHDR_SYN)) { - tcp_options_size = tcp_syn_options(sk, skb, &opts, &md5); + tcp_options_size = tcp_syn_options(sk, skb, &opts, &md5, ao_key); } else { tcp_options_size = tcp_established_options(sk, skb, &opts, - &md5); + &md5, ao_key); /* Force a PSH flag on all (GSO) packets to expedite GRO flush * at receiver : This slightly improve GRO performance. * Note that we do not force the PSH flag for non GSO packets, @@ -1351,7 +1412,7 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, th->window = htons(min(tp->rcv_wnd, 65535U)); } - tcp_options_write(th, tp, &opts); + tcp_options_write(th, tp, &opts, ao_key); #ifdef CONFIG_TCP_MD5SIG /* Calculate the MD5 hash, as we have all we need now */ @@ -1361,6 +1422,32 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, md5, sk, skb); } #endif +#ifdef CONFIG_TCP_AO + if (ao) { + u8 *traffic_key; + u8 key_buf[TCP_AO_MAX_HASH_SIZE]; + u32 sne; + __u32 disn; + + sk_gso_disable(sk); + if (unlikely(tcb->tcp_flags & TCPHDR_SYN)) { + if (tcb->tcp_flags & TCPHDR_ACK) + disn = ao->risn; + else + disn = 0; + traffic_key = key_buf; + tp->af_specific->ao_calc_key_sk(ao_key, traffic_key, + sk, ao->lisn, disn, true); + } else { + traffic_key = snd_other_key(ao_key); + } + sne = tcp_ao_compute_sne(ao->snd_sne, ao->snd_sne_seq, + ntohl(th->seq)); + tp->af_specific->calc_ao_hash(opts.hash_location, ao_key, sk, skb, + traffic_key, + opts.hash_location - (u8 *)th, sne); + } +#endif /* BPF prog is the last one writing header option */ bpf_skops_write_hdr_opt(sk, skb, NULL, NULL, 0, &opts); @@ -1822,6 +1909,10 @@ unsigned int tcp_current_mss(struct sock *sk) unsigned int header_len; struct tcp_out_options opts; struct tcp_md5sig_key *md5; + struct tcp_ao_key *ao_key = NULL; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao_info; +#endif mss_now = tp->mss_cache; @@ -1830,8 +1921,17 @@ unsigned int tcp_current_mss(struct sock *sk) if (mtu != inet_csk(sk)->icsk_pmtu_cookie) mss_now = tcp_sync_mss(sk, mtu); } - - header_len = tcp_established_options(sk, NULL, &opts, &md5) + +#ifdef CONFIG_TCP_AO + ao_info = rcu_dereference_check(tp->ao_info, lockdep_sock_is_held(sk)); + if (ao_info) + /* TODO: verify if we can access current_key or we need to pass + * it from every caller of tcp_current_mss instead. The reason + * is that the current_key pointer can change asynchronously + * from the rx path. + */ + ao_key = READ_ONCE(ao_info->current_key); +#endif + header_len = tcp_established_options(sk, NULL, &opts, &md5, ao_key) + sizeof(struct tcphdr); /* The mss_cache is sized based on tp->tcp_header_len, which assumes * some common options. If this is an odd packet (because we have SACK @@ -3582,7 +3682,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, /* bpf program will be interested in the tcp_flags */ TCP_SKB_CB(skb)->tcp_flags = TCPHDR_SYN | TCPHDR_ACK; tcp_header_size = tcp_synack_options(sk, req, mss, skb, &opts, md5, - foc, synack_type, + NULL, foc, synack_type, syn_skb) + sizeof(*th); skb_push(skb, tcp_header_size); @@ -3603,7 +3703,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, /* RFC1323: The window in SYN & SYN/ACK segments is never scaled. */ th->window = htons(min(req->rsk_rcv_wnd, 65535U)); - tcp_options_write(th, NULL, &opts); + tcp_options_write(th, NULL, &opts, NULL); th->doff = (tcp_header_size >> 2); TCP_INC_STATS(sock_net(sk), TCP_MIB_OUTSEGS); diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c index 2be0103fc4f8..4a21bcab733c 100644 --- a/net/ipv6/tcp_ao.c +++ b/net/ipv6/tcp_ao.c @@ -7,6 +7,7 @@ * Francesco Ruggeri * Salam Noureddine */ +#include #include #include @@ -70,6 +71,34 @@ struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, } EXPORT_SYMBOL_GPL(tcp_v6_ao_lookup); +int tcp_v6_ao_hash_pseudoheader(struct tcp_sigpool *hp, + const struct in6_addr *daddr, + const struct in6_addr *saddr, int nbytes) +{ + struct tcp6_pseudohdr *bp; + struct scatterlist sg; + + bp = hp->scratch; + /* 1. TCP pseudo-header (RFC2460) */ + bp->saddr = *saddr; + bp->daddr = *daddr; + bp->len = cpu_to_be32(nbytes); + bp->protocol = cpu_to_be32(IPPROTO_TCP); + + sg_init_one(&sg, bp, sizeof(*bp)); + ahash_request_set_crypt(hp->req, &sg, NULL, sizeof(*bp)); + return crypto_ahash_update(hp->req); +} + +int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, + const struct sock *sk, const struct sk_buff *skb, + const u8 *tkey, int hash_offset, u32 sne) +{ + return tcp_ao_hash_skb(AF_INET6, ao_hash, key, sk, skb, tkey, + hash_offset, sne); +} +EXPORT_SYMBOL_GPL(tcp_v6_ao_hash_skb); + int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen) { diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index e47151af9d42..7ff755e27686 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1920,6 +1920,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { #endif #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v6_ao_lookup, + .calc_ao_hash = tcp_v6_ao_hash_skb, .ao_parse = tcp_v6_parse_ao, .ao_calc_key_sk = tcp_v6_ao_calc_key_sk, #endif @@ -1953,6 +1954,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { #endif #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v6_ao_lookup, + .calc_ao_hash = tcp_v4_ao_hash_skb, .ao_parse = tcp_v6_parse_ao, #endif }; From patchwork Fri May 12 20:22:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239664 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7299D23D6C for ; Fri, 12 May 2023 20:23:33 +0000 (UTC) Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61F515FC5 for ; Fri, 12 May 2023 13:23:30 -0700 (PDT) Received: by mail-wr1-x42f.google.com with SMTP id ffacd0b85a97d-305f0491e62so9979697f8f.3 for ; Fri, 12 May 2023 13:23:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923009; x=1686515009; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=gjVap42SayboaOEeK2j683/O+m6yOzJSUISq3ieKrxY=; b=FnS3x/kT/KuAutUBtVPtRltv7UE1JoGOxrJ5Q59YqgM9Ac6hQaViHwWRz0E9km5o6U hum2tMwNO+xrC1qLbImkcsAbkmbBwGn6DislA+LIyNhjvLCCScY8X5LX+TO5GzV0Xold bGgh2+g0VH45IWCjES5kIxMCAv4ApTSWyiHMkhmVfqWN1P5skXxG5wNcKgxurKt5Cib2 kXLt1TEmAnD8PVUIEO4JumzNbxGmO8yRfxUP9jcFpKOUV0XcAsFlxjrBBzNYV5k/U5Pj Dz+M+hq7Rq8prWz9zWoTiTcBhNA3lKktm16a/7nPZZPJRYlRzkmu4PEwdKM3Kxc3yg6t VQBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923009; x=1686515009; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=gjVap42SayboaOEeK2j683/O+m6yOzJSUISq3ieKrxY=; b=PyqMihOue+ThPNFXMlKO5S4mu7qgZAQjrWlk+sxdsRR0TDfnRw44Rh5qZZ9ql1CndG XhGEl1MW/Tj9i9zIVAIFuFOHWi+OppYZvPRKIrUg0wp9fc9dduOsgEcCry/BdID3Mx6f BuoyYkq6ovezVXP/GMDeX8kIXkj5vURihjmv9LFB1LZkvTpI/8AIf7s4yQnymPzH70sU zC3FgmWT8glKOQpRvQu4DKGeRB7Nqr61vfUC4vGvjQfdeiDmUBjrTjVveyWAsjzKngMN k2rySUfJRoIhcjIsOhOUn4NXgDoXR2XQgm1ClkGSx+tVw4fAUDWwemvyk1LJLXeKNWo6 WS2Q== X-Gm-Message-State: AC+VfDyFqZHrWdHCIqfF+UXEbQ3nCdcAp2Q03So8Az95Un7t1jB9EbSZ 47ylxksceOpF3sITk484P/FbHw== X-Google-Smtp-Source: ACHHUZ6NRB/X4H/Ltcbapm5zsIzAM3nYRHst8ZWWo88XUlFIiMjIvkHCKOYOMk+ktU5/EpuAsMz09g== X-Received: by 2002:a05:6000:1362:b0:307:7dc6:cce4 with SMTP id q2-20020a056000136200b003077dc6cce4mr20047685wrz.32.1683923008828; Fri, 12 May 2023 13:23:28 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:28 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 07/21] net/tcp: Add tcp_parse_auth_options() Date: Fri, 12 May 2023 21:22:57 +0100 Message-Id: <20230512202311.2845526-8-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Introduce a helper that: (1) shares the common code with TCP-MD5 header options parsing (2) looks for hash signature only once for both TCP-MD5 and TCP-AO (3) fails with -EEXIST if any TCP sign option is present twice, see RFC5925 (2.2): ">> A single TCP segment MUST NOT have more than one TCP-AO in its options sequence. When multiple TCP-AOs appear, TCP MUST discard the segment." Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 24 +++++++++++++++++++++++- include/net/tcp_ao.h | 17 ++++++++++++++++- net/ipv4/tcp.c | 3 ++- net/ipv4/tcp_input.c | 39 +++++++++++++++++++++++++++++---------- net/ipv4/tcp_ipv4.c | 15 ++++++++++----- net/ipv6/tcp_ipv6.c | 11 +++++++---- 6 files changed, 87 insertions(+), 22 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 50d255ac3500..e93f9f0fb464 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -434,7 +434,6 @@ int tcp_mmap(struct file *file, struct socket *sock, void tcp_parse_options(const struct net *net, const struct sk_buff *skb, struct tcp_options_received *opt_rx, int estab, struct tcp_fastopen_cookie *foc); -const u8 *tcp_parse_md5sig_option(const struct tcphdr *th); /* * BPF SKB-less helpers @@ -2535,6 +2534,29 @@ static inline u64 tcp_transmit_time(const struct sock *sk) return 0; } +static inline int tcp_parse_auth_options(const struct tcphdr *th, + const u8 **md5_hash, const struct tcp_ao_hdr **aoh) +{ + const u8 *md5_tmp, *ao_tmp; + int ret; + + ret = tcp_do_parse_auth_options(th, &md5_tmp, &ao_tmp); + if (ret) + return ret; + + if (md5_hash) + *md5_hash = md5_tmp; + + if (aoh) { + if (!ao_tmp) + *aoh = NULL; + else + *aoh = (struct tcp_ao_hdr *)(ao_tmp - 2); + } + + return 0; +} + static inline bool tcp_ao_required(struct sock *sk, const void *saddr, int family) { diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index ee32af145bba..72fc87cf58bf 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -156,7 +156,9 @@ int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen); void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb); void tcp_ao_connect_init(struct sock *sk); - +void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, + struct tcp_request_sock *treq, + unsigned short int family); #else /* CONFIG_TCP_AO */ static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, @@ -179,4 +181,17 @@ static inline void tcp_ao_connect_init(struct sock *sk) } #endif +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) +int tcp_do_parse_auth_options(const struct tcphdr *th, + const u8 **md5_hash, const u8 **ao_hash); +#else +static int tcp_do_parse_auth_options(const struct tcphdr *th, + const u8 **md5_hash, const u8 **ao_hash) +{ + *md5_hash = NULL; + *ao_hash = NULL; + return 0; +} +#endif + #endif /* _TCP_AO_H */ diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index fa94d5c416b0..fe30260be4c2 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4502,7 +4502,8 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, l3index = sdif ? dif : 0; hash_expected = tcp_md5_do_lookup(sk, l3index, saddr, family); - hash_location = tcp_parse_md5sig_option(th); + if (tcp_parse_auth_options(th, &hash_location, NULL)) + return true; /* We've parsed the options - do we have a hash? */ if (!hash_expected && !hash_location) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 2a9010b4ac8c..9626c703caed 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -4202,39 +4202,58 @@ static bool tcp_fast_parse_options(const struct net *net, return true; } -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) /* - * Parse MD5 Signature option + * Parse Signature options */ -const u8 *tcp_parse_md5sig_option(const struct tcphdr *th) +int tcp_do_parse_auth_options(const struct tcphdr *th, + const u8 **md5_hash, const u8 **ao_hash) { int length = (th->doff << 2) - sizeof(*th); const u8 *ptr = (const u8 *)(th + 1); + unsigned int minlen = TCPOLEN_MD5SIG; + + if (IS_ENABLED(CONFIG_TCP_AO)) + minlen = sizeof(struct tcp_ao_hdr) + 1; + + *md5_hash = NULL; + *ao_hash = NULL; /* If not enough data remaining, we can short cut */ - while (length >= TCPOLEN_MD5SIG) { + while (length >= minlen) { int opcode = *ptr++; int opsize; switch (opcode) { case TCPOPT_EOL: - return NULL; + return 0; case TCPOPT_NOP: length--; continue; default: opsize = *ptr++; if (opsize < 2 || opsize > length) - return NULL; - if (opcode == TCPOPT_MD5SIG) - return opsize == TCPOLEN_MD5SIG ? ptr : NULL; + return -EINVAL; + if (opcode == TCPOPT_MD5SIG) { + if (opsize != TCPOLEN_MD5SIG) + return -EINVAL; + if (unlikely(*md5_hash || *ao_hash)) + return -EEXIST; + *md5_hash = ptr; + } else if (opcode == TCPOPT_AO) { + if (opsize <= sizeof(struct tcp_ao_hdr)) + return -EINVAL; + if (unlikely(*md5_hash || *ao_hash)) + return -EEXIST; + *ao_hash = ptr; + } } ptr += opsize - 2; length -= opsize; } - return NULL; + return 0; } -EXPORT_SYMBOL(tcp_parse_md5sig_option); +EXPORT_SYMBOL(tcp_do_parse_auth_options); #endif /* Sorry, PAWS as specified is broken wrt. pure-ACKs -DaveM diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index bd9b9118e1f0..a88465ed5d39 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -668,7 +668,9 @@ EXPORT_SYMBOL(tcp_v4_send_check); * Exception: precedence violation. We do not implement it in any case. */ -#ifdef CONFIG_TCP_MD5SIG +#ifdef CONFIG_TCP_AO +#define OPTION_BYTES MAX_TCP_OPTION_SPACE +#elif defined(CONFIG_TCP_MD5SIG) #define OPTION_BYTES TCPOLEN_MD5SIG_ALIGNED #else #define OPTION_BYTES sizeof(__be32) @@ -684,7 +686,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) struct ip_reply_arg arg; #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *key = NULL; - const __u8 *hash_location = NULL; + const __u8 *md5_hash_location = NULL; unsigned char newhash[16]; int genhash; struct sock *sk1 = NULL; @@ -724,8 +726,11 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); #ifdef CONFIG_TCP_MD5SIG + /* Invalid TCP option size or twice included auth */ + if (tcp_parse_auth_options(tcp_hdr(skb), &md5_hash_location, NULL)) + return; + rcu_read_lock(); - hash_location = tcp_parse_md5sig_option(th); if (sk && sk_fullsock(sk)) { const union tcp_md5_addr *addr; int l3index; @@ -736,7 +741,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0; addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr; key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET); - } else if (hash_location) { + } else if (md5_hash_location) { const union tcp_md5_addr *addr; int sdif = tcp_v4_sdif(skb); int dif = inet_iif(skb); @@ -768,7 +773,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb); - if (genhash || memcmp(hash_location, newhash, 16) != 0) + if (genhash || memcmp(md5_hash_location, newhash, 16) != 0) goto out; } diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 7ff755e27686..0074d1f1f8a5 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -993,7 +993,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) u32 seq = 0, ack_seq = 0; struct tcp_md5sig_key *key = NULL; #ifdef CONFIG_TCP_MD5SIG - const __u8 *hash_location = NULL; + const __u8 *md5_hash_location = NULL; unsigned char newhash[16]; int genhash; struct sock *sk1 = NULL; @@ -1015,8 +1015,11 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); #ifdef CONFIG_TCP_MD5SIG + /* Invalid TCP option size or twice included auth */ + if (tcp_parse_auth_options(th, &md5_hash_location, NULL)) + return; + rcu_read_lock(); - hash_location = tcp_parse_md5sig_option(th); if (sk && sk_fullsock(sk)) { int l3index; @@ -1025,7 +1028,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) */ l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index); - } else if (hash_location) { + } else if (md5_hash_location) { int dif = tcp_v6_iif_l3_slave(skb); int sdif = tcp_v6_sdif(skb); int l3index; @@ -1054,7 +1057,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) goto out; genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); - if (genhash || memcmp(hash_location, newhash, 16) != 0) + if (genhash || memcmp(md5_hash_location, newhash, 16) != 0) goto out; } #endif From patchwork Fri May 12 20:22:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239665 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3A8BC1F95D for ; Fri, 12 May 2023 20:23:34 +0000 (UTC) Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C04625B8F for ; Fri, 12 May 2023 13:23:31 -0700 (PDT) Received: by mail-wr1-x42a.google.com with SMTP id ffacd0b85a97d-307d58b3efbso1005441f8f.0 for ; Fri, 12 May 2023 13:23:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923010; x=1686515010; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=iGLTbtfJG2YBS89eNsMlmCFY4GDm/SHDv6kwkD9qMAc=; b=IANjyqGx0QtkLbJTD+1x5P/O8BzOtOKE79k66V4ILce3k6kcYtQQU9kfj7c4h5ihie HXVMQVXgUyVtplMIU7YsTQ9UPzl6YhKVt7ev/9pvmcNaESU5zxEhnB0jkYxzB3zaIJ7N 0QGKP3ooyJ+TCKrPKyFujTGmKg9oneAAu7ShG4Otd0VUJYs+pH+Ic6SWbmOOsXEk/8PS WG0qZKOKCCAOG6MEZOWKRu5AfQBFWOSqSY2Siwr6DDwWn5oBMkrUMJ4SYskDA41RFWMU Av8KoLdP08tk87bN+peW7xFp/0oWk+8ScdPCro9ZSmVzFSLdlgo+sLhM/bLjjm7/Uxe0 gRYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923010; x=1686515010; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=iGLTbtfJG2YBS89eNsMlmCFY4GDm/SHDv6kwkD9qMAc=; b=WOo8wpXusXdF1vqpFfZeT1hZy2/tA08g7VIuif5CqHNxOdyVyBHGlTHHbT4PdQvuje uJNb2A6HND+OLqTI/gGONYh+uINvPnhp5/6n1zbJoOJfZBhwWeQaBNQ6RVdomAphusXK pjZez4aS7NrYML/CitHCw1AjlEdZvDa1YiWLTl05cTb79SQVi8LPsQnw0xGr/h5Is6hx CVwlpbaOPqZeMWGdQFWWwvdJivsCDQswoogbR93TpOYwihVO+9Lu5HT2kI0QJQpENAxp hlYjA3L4d0sqwpU8f9HPNEU/iB+4RTk60o0MASbezXEph/32bUvlxlv+cyllnPtPwQks R0gQ== X-Gm-Message-State: AC+VfDzWud2RAkJmv9VFSoRhlrI0g6zcGdzrrPEqWWgt9Eth5C5SKnGp 0NUSoErBy1PBoLq3Amazh+Tm9w== X-Google-Smtp-Source: ACHHUZ6QjMC6rQVWCWL5q1BlJiPkblBsxdYM+96fRG+nYo1MtD81WUGQ0fy79ntAKrT4aGeou/tfgw== X-Received: by 2002:a5d:4c85:0:b0:307:904b:29e1 with SMTP id z5-20020a5d4c85000000b00307904b29e1mr13748300wrs.20.1683923010192; Fri, 12 May 2023 13:23:30 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:29 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 08/21] net/tcp: Add AO sign to RST packets Date: Fri, 12 May 2023 21:22:58 +0100 Message-Id: <20230512202311.2845526-9-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Wire up sending resets to TCP-AO hashing. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp_ao.h | 8 ++++ net/ipv4/tcp_ao.c | 60 ++++++++++++++++++++++++- net/ipv4/tcp_ipv4.c | 82 +++++++++++++++++++++++++++++----- net/ipv6/tcp_ipv6.c | 102 +++++++++++++++++++++++++++++++++++++------ 4 files changed, 227 insertions(+), 25 deletions(-) diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 72fc87cf58bf..5b85ecd7024a 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -121,6 +121,8 @@ int tcp_ao_hash_skb(unsigned short int family, const u8 *tkey, int hash_offset, u32 sne); int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, sockptr_t optval, int optlen); +struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, + int sndid, int rcvid); int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, unsigned int len); void tcp_ao_destroy_sock(struct sock *sk); @@ -128,6 +130,12 @@ u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq); struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port); +int tcp_ao_hash_hdr(unsigned short family, char *ao_hash, + struct tcp_ao_key *key, const u8 *tkey, + const union tcp_ao_addr *daddr, + const union tcp_ao_addr *saddr, + const struct tcphdr *th, u32 sne); + /* ipv4 specific functions */ int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen); struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 7708c994ff45..61f26e9c3fc0 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -56,8 +56,8 @@ int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, * it's known that the keys in ao_info are matching peer's * family/address/port/VRF/etc. */ -static struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, - int sndid, int rcvid) +struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, + int sndid, int rcvid) { struct tcp_ao_key *key; @@ -70,6 +70,7 @@ static struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, return NULL; } +EXPORT_SYMBOL_GPL(tcp_ao_established_key); static inline int ipv4_prefix_cmp(const struct in_addr *addr1, const struct in_addr *addr2, @@ -387,6 +388,61 @@ static int tcp_ao_hash_header(struct tcp_sigpool *hp, return err; } +int tcp_ao_hash_hdr(unsigned short int family, char *ao_hash, + struct tcp_ao_key *key, const u8 *tkey, + const union tcp_ao_addr *daddr, + const union tcp_ao_addr *saddr, + const struct tcphdr *th, u32 sne) +{ + __u8 tmp_hash[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + int tkey_len = tcp_ao_digest_size(key); + int hash_offset = ao_hash - (char *)th; + struct tcp_sigpool hp; + + if (tcp_sigpool_start(key->tcp_sigpool_id, &hp)) + goto clear_hash_noput; + + if (crypto_ahash_setkey(crypto_ahash_reqtfm(hp.req), tkey, tkey_len)) + goto clear_hash; + + if (crypto_ahash_init(hp.req)) + goto clear_hash; + + if (tcp_ao_hash_sne(&hp, sne)) + goto clear_hash; + if (family == AF_INET) { + if (tcp_v4_ao_hash_pseudoheader(&hp, daddr->a4.s_addr, + saddr->a4.s_addr, th->doff * 4)) + goto clear_hash; +#if IS_ENABLED(CONFIG_IPV6) + } else if (family == AF_INET6) { + if (tcp_v6_ao_hash_pseudoheader(&hp, &daddr->a6, + &saddr->a6, th->doff * 4)) + goto clear_hash; +#endif + } else { + WARN_ON_ONCE(1); + goto clear_hash; + } + if (tcp_ao_hash_header(&hp, th, false, + ao_hash, hash_offset, tcp_ao_maclen(key))) + goto clear_hash; + ahash_request_set_crypt(hp.req, NULL, tmp_hash, 0); + if (crypto_ahash_final(hp.req)) + goto clear_hash; + + memcpy(ao_hash, tmp_hash, tcp_ao_maclen(key)); + tcp_sigpool_end(&hp); + return 0; + +clear_hash: + tcp_sigpool_end(&hp); +clear_hash_noput: + memset(ao_hash, 0, tcp_ao_maclen(key)); + return 1; +} +EXPORT_SYMBOL_GPL(tcp_ao_hash_hdr); + int tcp_ao_hash_skb(unsigned short int family, char *ao_hash, struct tcp_ao_key *key, const struct sock *sk, const struct sk_buff *skb, diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index a88465ed5d39..1e30161c7a09 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -684,16 +684,19 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) __be32 opt[OPTION_BYTES / sizeof(__be32)]; } rep; struct ip_reply_arg arg; -#ifdef CONFIG_TCP_MD5SIG - struct tcp_md5sig_key *key = NULL; - const __u8 *md5_hash_location = NULL; - unsigned char newhash[16]; - int genhash; - struct sock *sk1 = NULL; -#endif u64 transmit_time = 0; struct sock *ctl_sk; struct net *net; +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) + const __u8 *md5_hash_location = NULL; + const struct tcp_ao_hdr *aoh; +#ifdef CONFIG_TCP_MD5SIG + struct tcp_md5sig_key *key = NULL; + unsigned char newhash[16]; + struct sock *sk1 = NULL; + int genhash; +#endif +#endif /* Never send a reset in response to a reset. */ if (th->rst) @@ -725,12 +728,14 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) arg.iov[0].iov_len = sizeof(rep.th); net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) /* Invalid TCP option size or twice included auth */ - if (tcp_parse_auth_options(tcp_hdr(skb), &md5_hash_location, NULL)) + if (tcp_parse_auth_options(tcp_hdr(skb), &md5_hash_location, &aoh)) return; rcu_read_lock(); +#endif +#ifdef CONFIG_TCP_MD5SIG if (sk && sk_fullsock(sk)) { const union tcp_md5_addr *addr; int l3index; @@ -791,6 +796,63 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) key, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, &rep.th); } +#endif +#ifdef CONFIG_TCP_AO + /* if (!sk || sk->sk_state == TCP_LISTEN) then the initial sisn/disn + * are unknown. Skip TCP-AO signing. + * Contrary to TCP-MD5 unsigned RST will be sent if there was AO sign + * in segment, but TCP-AO signing isn't possible for reply. + */ + if (sk && aoh && sk->sk_state != TCP_LISTEN) { + char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + struct tcp_ao_key *ao_key, *rnext_key; + struct tcp_ao_info *ao_info; + u32 ao_sne; + u8 keyid; + + /* TODO: reqsk support */ + if (sk->sk_state == TCP_NEW_SYN_RECV) + goto skip_ao_sign; + + ao_info = rcu_dereference(tcp_sk(sk)->ao_info); + + if (!ao_info) + goto skip_ao_sign; + + ao_key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1); + if (!ao_key) + goto skip_ao_sign; + + /* XXX: optimize by using cached traffic key depending + * on socket state + */ + if (tcp_v4_ao_calc_key_sk(ao_key, traffic_key, sk, + ao_info->lisn, ao_info->risn, true)) + goto out; + + /* rcv_next holds the rcv_next of the peer, make keyid + * hold our rcv_next + */ + rnext_key = READ_ONCE(ao_info->rnext_key); + keyid = rnext_key->rcvid; + ao_sne = tcp_ao_compute_sne(ao_info->snd_sne, + ao_info->snd_sne_seq, + ntohl(rep.th.seq)); + + rep.opt[0] = htonl((TCPOPT_AO << 24) | + (tcp_ao_len(ao_key) << 16) | + (aoh->rnext_keyid << 8) | keyid); + arg.iov[0].iov_len += round_up(tcp_ao_len(ao_key), 4); + rep.th.doff = arg.iov[0].iov_len / 4; + + if (tcp_ao_hash_hdr(AF_INET, (char *)&rep.opt[1], + ao_key, traffic_key, + (union tcp_ao_addr *)&ip_hdr(skb)->saddr, + (union tcp_ao_addr *)&ip_hdr(skb)->daddr, + &rep.th, ao_sne)) + goto out; + } +skip_ao_sign: #endif /* Can't co-exist with TCPMD5, hence check rep.opt[0] */ if (rep.opt[0] == 0) { @@ -848,7 +910,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) __TCP_INC_STATS(net, TCP_MIB_OUTRSTS); local_bh_enable(); -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) out: rcu_read_unlock(); #endif diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 0074d1f1f8a5..99ce31ef13b8 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -858,7 +858,9 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, struct tcp_md5sig_key *key, int rst, - u8 tclass, __be32 label, u32 priority, u32 txhash) + u8 tclass, __be32 label, u32 priority, u32 txhash, + struct tcp_ao_key *ao_key, char *tkey, + u8 rcv_next, u32 ao_sne) { const struct tcphdr *th = tcp_hdr(skb); struct tcphdr *t1; @@ -877,6 +879,13 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 if (key) tot_len += TCPOLEN_MD5SIG_ALIGNED; #endif +#ifdef CONFIG_TCP_AO + if (ao_key) + tot_len += tcp_ao_len(ao_key); +#endif +#if defined(CONFIG_TCP_MD5SIG) && defined(CONFIG_TCP_AO) + WARN_ON_ONCE(key && ao_key); +#endif #ifdef CONFIG_MPTCP if (rst && !key) { @@ -928,6 +937,21 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 &ipv6_hdr(skb)->daddr, t1); } #endif +#ifdef CONFIG_TCP_AO + if (ao_key) { + *topt++ = htonl((TCPOPT_AO << 24) | (tcp_ao_len(ao_key) << 16) | + (ao_key->sndid << 8) | (rcv_next)); + + /* TODO: this is right now not going to work for listening + * sockets since the socket won't have the needed ipv6 + * addresses + */ + tcp_ao_hash_hdr(AF_INET6, (char *)topt, ao_key, tkey, + (union tcp_ao_addr *)&ipv6_hdr(skb)->saddr, + (union tcp_ao_addr *)&ipv6_hdr(skb)->daddr, + t1, ao_sne); + } +#endif memset(&fl6, 0, sizeof(fl6)); fl6.daddr = ipv6_hdr(skb)->saddr; @@ -992,17 +1016,28 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) struct ipv6hdr *ipv6h = ipv6_hdr(skb); u32 seq = 0, ack_seq = 0; struct tcp_md5sig_key *key = NULL; -#ifdef CONFIG_TCP_MD5SIG + __be32 label = 0; + u32 priority = 0; + struct net *net; + struct tcp_ao_key *ao_key = NULL; + u8 rcv_next = 0; + u32 ao_sne = 0; + u32 txhash = 0; + int oif = 0; +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) const __u8 *md5_hash_location = NULL; + const struct tcp_ao_hdr *aoh; +#endif +#ifdef CONFIG_TCP_MD5SIG unsigned char newhash[16]; int genhash; struct sock *sk1 = NULL; #endif - __be32 label = 0; - u32 priority = 0; - struct net *net; - u32 txhash = 0; - int oif = 0; +#ifdef CONFIG_TCP_AO + char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; +#else + u8 *traffic_key = NULL; +#endif if (th->rst) return; @@ -1014,12 +1049,13 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) return; net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) /* Invalid TCP option size or twice included auth */ - if (tcp_parse_auth_options(th, &md5_hash_location, NULL)) + if (tcp_parse_auth_options(th, &md5_hash_location, &aoh)) return; - rcu_read_lock(); +#endif +#ifdef CONFIG_TCP_MD5SIG if (sk && sk_fullsock(sk)) { int l3index; @@ -1068,6 +1104,45 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - (th->doff << 2); +#ifdef CONFIG_TCP_AO + /* if (!sk || sk->sk_state == TCP_LISTEN) then the initial sisn/disn + * are unknown. Skip TCP-AO signing. + * Contrary to TCP-MD5 unsigned RST will be sent if there was AO sign + * in segment, but TCP-AO signing isn't possible for reply. + */ + if (sk && aoh && sk->sk_state != TCP_LISTEN) { + struct tcp_ao_info *ao_info; + struct tcp_ao_key *rnext_key; + + /* TODO: reqsk support */ + if (sk->sk_state == TCP_NEW_SYN_RECV) + goto skip_ao_sign; + + ao_info = rcu_dereference(tcp_sk(sk)->ao_info); + if (!ao_info) + goto skip_ao_sign; + + /* rcv_next is the peer's here */ + ao_key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1); + if (!ao_key) + goto skip_ao_sign; + + /* XXX: optimize by using cached traffic key depending + * on socket state + */ + if (tcp_v6_ao_calc_key_sk(ao_key, traffic_key, sk, + ao_info->lisn, ao_info->risn, true)) + goto out; + + /* rcv_next switches to our rcv_next */ + rnext_key = READ_ONCE(ao_info->rnext_key); + rcv_next = rnext_key->rcvid; + ao_sne = tcp_ao_compute_sne(ao_info->snd_sne, + ao_info->snd_sne_seq, seq); + } +skip_ao_sign: +#endif + if (sk) { oif = sk->sk_bound_dev_if; if (sk_fullsock(sk)) { @@ -1090,9 +1165,10 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) } tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, - ipv6_get_dsfield(ipv6h), label, priority, txhash); + ipv6_get_dsfield(ipv6h), label, priority, txhash, + ao_key, traffic_key, rcv_next, ao_sne); -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) out: rcu_read_unlock(); #endif @@ -1104,7 +1180,7 @@ static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, __be32 label, u32 priority, u32 txhash) { tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, - tclass, label, priority, txhash); + tclass, label, priority, txhash, NULL, NULL, 0, 0); } static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) From patchwork Fri May 12 20:22:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239666 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C713F200DF for ; Fri, 12 May 2023 20:23:35 +0000 (UTC) Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50EE340DD for ; Fri, 12 May 2023 13:23:33 -0700 (PDT) Received: by mail-wr1-x42a.google.com with SMTP id ffacd0b85a97d-3078c092056so5211930f8f.1 for ; Fri, 12 May 2023 13:23:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923012; x=1686515012; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=f6z0xmO4zq2oqQFzEdP5GI7EgIOIcsMykxB51L1W6Ys=; b=feFfjkebv3hB6coequmtvyNwYg9Hs98TdvNIqYBDoDE5Ira+nMdOZmzuewDxmnl808 u8aYp0ZuQ8GpdVRR+8iubmAG+J058fqbpQxAVk2MeRwOFqnujFQ5+J4+QWaJC5nPInKE 53HidK7ORhOKdI81fCQg0bIfr+QPwa3PM+lIy8bCW2gQwCeEjmCkyURdpFttMgPPdjMY 6JMHjeKhIfUIpC58Y1a/672FQ8otq5FEB0piO9Ri5FG8VhJr5v9/SiGrnR4H7ZkJmoGY LEI2QvKCYYbYcB/YFc07RkHRlO6lHOATpdIQNmWUc5tYW6oPJhTSALOKSJU8Ah5jLXGG 0b6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923012; x=1686515012; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=f6z0xmO4zq2oqQFzEdP5GI7EgIOIcsMykxB51L1W6Ys=; b=WPuwZEE5FEhewlwLqp+3/8fZmzcB0AqNC740f/pAyG+ls4l7n4l4sMt4mU244W7E4s /jbw3cS+4Q3bomTuHMruLi5tsVORSlzDzDAwPZGPsciP+vNoD1cma+L4M82lkw0hv5Li RNnwrS+OVadeaM8mTqbEiA7f1i8lMzb1Qm1CQ6ket3NP9tRp1DrxhbnDcaag9XKYlP2X lZWB7knlJLoHADL4ix39iJziFBA6NzhIGt6A6AojvMuNh1ozsbZFtYvB+jM+tOWSaAvy 0PFu+dvP1pjdxs9VRQOJSlESSDPyUckAyq3a5lvSXH+yNfj7bDiOzA0u1FF3ggEhW6n8 7BHg== X-Gm-Message-State: AC+VfDzErt2eBFItLTMdiWALh7b248FQV6bBtFBtqXEVIoG521fwjLva QCMz5zu2L84qr8W9noUjvNwKRg== X-Google-Smtp-Source: ACHHUZ48E2GsY+oY4HPg57DasIskU1DAoHryfmTidKuMSGZyXBFLO0lBKb6VcrllNIHTF1PQIrSJ/Q== X-Received: by 2002:adf:de03:0:b0:2f5:7ce1:781d with SMTP id b3-20020adfde03000000b002f57ce1781dmr16832689wrm.50.1683923011726; Fri, 12 May 2023 13:23:31 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:31 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 09/21] net/tcp: Add TCP-AO sign to twsk Date: Fri, 12 May 2023 21:22:59 +0100 Message-Id: <20230512202311.2845526-10-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Add support for sockets in time-wait state. ao_info as well as all keys are inherited on transition to time-wait socket. The lifetime of ao_info is now protected by ref counter, so that tcp_ao_destroy_sock() will destruct it only when the last user is gone. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/linux/tcp.h | 3 ++ include/net/tcp_ao.h | 11 ++++-- net/ipv4/tcp_ao.c | 38 ++++++++++++++++++--- net/ipv4/tcp_ipv4.c | 74 +++++++++++++++++++++++++++++++++++----- net/ipv4/tcp_minisocks.c | 4 ++- net/ipv4/tcp_output.c | 2 +- net/ipv6/tcp_ipv6.c | 49 +++++++++++++++++++++++--- 7 files changed, 159 insertions(+), 22 deletions(-) diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 673b32e47c30..0c50a9aaa780 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -500,6 +500,9 @@ struct tcp_timewait_sock { #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *tw_md5_key; #endif +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao_info; +#endif }; static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 5b85ecd7024a..a8632f258890 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -91,6 +91,7 @@ struct tcp_ao_info { u32 snd_sne_seq; u32 rcv_sne; u32 rcv_sne_seq; + atomic_t refcnt; /* Protects twsk destruction */ struct rcu_head rcu; }; @@ -125,8 +126,9 @@ struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, int sndid, int rcvid); int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, unsigned int len); -void tcp_ao_destroy_sock(struct sock *sk); +void tcp_ao_destroy_sock(struct sock *sk, bool twsk); u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq); +void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp); struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port); @@ -176,7 +178,7 @@ static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, return NULL; } -static inline void tcp_ao_destroy_sock(struct sock *sk) +static inline void tcp_ao_destroy_sock(struct sock *sk, bool twsk) { } @@ -184,6 +186,11 @@ static inline void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb) { } +static inline void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, + struct tcp_sock *tp) +{ +} + static inline void tcp_ao_connect_init(struct sock *sk) { } diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 61f26e9c3fc0..741d12eb46d5 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -171,6 +171,7 @@ static struct tcp_ao_info *tcp_ao_alloc_info(gfp_t flags) if (!ao) return NULL; INIT_HLIST_HEAD(&ao->head); + atomic_set(&ao->refcnt, 1); return ao; } @@ -188,27 +189,54 @@ static void tcp_ao_key_free_rcu(struct rcu_head *head) kfree(key); } -void tcp_ao_destroy_sock(struct sock *sk) +void tcp_ao_destroy_sock(struct sock *sk, bool twsk) { struct tcp_ao_info *ao; struct tcp_ao_key *key; struct hlist_node *n; - ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1); - tcp_sk(sk)->ao_info = NULL; + if (twsk) { + ao = rcu_dereference_protected(tcp_twsk(sk)->ao_info, 1); + tcp_twsk(sk)->ao_info = NULL; + } else { + ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1); + tcp_sk(sk)->ao_info = NULL; + } - if (!ao) + if (!ao || !atomic_dec_and_test(&ao->refcnt)) return; hlist_for_each_entry_safe(key, n, &ao->head, node) { hlist_del_rcu(&key->node); - atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc); + if (!twsk) + atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc); call_rcu(&key->rcu, tcp_ao_key_free_rcu); } kfree_rcu(ao, rcu); } +void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp) +{ + struct tcp_ao_info *ao_info = rcu_dereference_protected(tp->ao_info, 1); + + if (ao_info) { + struct tcp_ao_key *key; + struct hlist_node *n; + int omem = 0; + + hlist_for_each_entry_safe(key, n, &ao_info->head, node) { + omem += tcp_ao_sizeof_key(key); + } + + atomic_inc(&ao_info->refcnt); + atomic_sub(omem, &(((struct sock *)tp)->sk_omem_alloc)); + rcu_assign_pointer(tcptw->ao_info, ao_info); + } else { + tcptw->ao_info = NULL; + } +} + /* 4 tuple and ISNs are expected in NBO */ static int tcp_v4_ao_calc_key(struct tcp_ao_key *mkt, u8 *key, __be32 saddr, __be32 daddr, diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 1e30161c7a09..7b82e5ee4073 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -814,8 +814,10 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb) if (sk->sk_state == TCP_NEW_SYN_RECV) goto skip_ao_sign; - ao_info = rcu_dereference(tcp_sk(sk)->ao_info); - + if (sk->sk_state == TCP_TIME_WAIT) + ao_info = rcu_dereference(tcp_twsk(sk)->ao_info); + else + ao_info = rcu_dereference(tcp_sk(sk)->ao_info); if (!ao_info) goto skip_ao_sign; @@ -924,16 +926,16 @@ static void tcp_v4_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, struct tcp_md5sig_key *key, + struct tcp_ao_key *ao_key, + u8 *traffic_key, + u8 rcv_next, + u32 ao_sne, int reply_flags, u8 tos) { const struct tcphdr *th = tcp_hdr(skb); struct { struct tcphdr th; - __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) -#ifdef CONFIG_TCP_MD5SIG - + (TCPOLEN_MD5SIG_ALIGNED >> 2) -#endif - ]; + __be32 opt[(MAX_TCP_OPTION_SPACE >> 2)]; } rep; struct net *net = sock_net(sk); struct ip_reply_arg arg; @@ -978,6 +980,24 @@ static void tcp_v4_send_ack(const struct sock *sk, key, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, &rep.th); } +#endif +#ifdef CONFIG_TCP_AO + if (ao_key) { + int offset = (tsecr) ? 3 : 0; + + rep.opt[offset++] = htonl((TCPOPT_AO << 24) | + (tcp_ao_len(ao_key) << 16) | + (ao_key->sndid << 8) | rcv_next); + arg.iov[0].iov_len += round_up(tcp_ao_len(ao_key), 4); + rep.th.doff = arg.iov[0].iov_len / 4; + + tcp_ao_hash_hdr(AF_INET, (char *)&rep.opt[offset], + ao_key, traffic_key, + (union tcp_ao_addr *)&ip_hdr(skb)->saddr, + (union tcp_ao_addr *)&ip_hdr(skb)->daddr, + &rep.th, ao_sne); + } + WARN_ON_ONCE(key && ao_key); #endif arg.flags = reply_flags; arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, @@ -1012,6 +1032,39 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) { struct inet_timewait_sock *tw = inet_twsk(sk); struct tcp_timewait_sock *tcptw = tcp_twsk(sk); + struct tcp_ao_key *ao_key = NULL; + u8 *traffic_key = NULL; + u8 rcv_next = 0; + u32 ao_sne = 0; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao_info; + + /* FIXME: the segment to-be-acked is not verified yet */ + ao_info = rcu_dereference(tcptw->ao_info); + if (ao_info) { + const struct tcp_ao_hdr *aoh; + + if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) + goto out; /* something is wrong with the sign */ + + if (aoh) + ao_key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1); + } + if (ao_key) { + struct tcp_ao_key *rnext_key; + + traffic_key = snd_other_key(ao_key); + /* It's possible we can get rid of computing the sne + * below since sne probably doesn't change once we are + * in timewait state. + */ + ao_sne = tcp_ao_compute_sne(ao_info->snd_sne, + ao_info->snd_sne_seq, + tcptw->tw_snd_nxt); + rnext_key = READ_ONCE(ao_info->rnext_key); + rcv_next = rnext_key->rcvid; + } +#endif tcp_v4_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, @@ -1020,10 +1073,14 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), + ao_key, traffic_key, rcv_next, ao_sne, tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, tw->tw_tos ); +#ifdef CONFIG_TCP_AO +out: +#endif inet_twsk_put(tw); } @@ -1053,6 +1110,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, req->ts_recent, 0, tcp_md5_do_lookup(sk, l3index, addr, AF_INET), + NULL, NULL, 0, 0, inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, ip_hdr(skb)->tos); } @@ -2413,7 +2471,7 @@ void tcp_v4_destroy_sock(struct sock *sk) rcu_assign_pointer(tp->md5sig_info, NULL); } #endif - tcp_ao_destroy_sock(sk); + tcp_ao_destroy_sock(sk, false); /* Clean up a referenced TCP bind bucket. */ if (inet_csk(sk)->icsk_bind_hash) diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index 63b5c5f42a87..ea6e5c97c66a 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -279,7 +279,7 @@ static void tcp_time_wait_init(struct sock *sk, struct tcp_timewait_sock *tcptw) void tcp_time_wait(struct sock *sk, int state, int timeo) { const struct inet_connection_sock *icsk = inet_csk(sk); - const struct tcp_sock *tp = tcp_sk(sk); + struct tcp_sock *tp = tcp_sk(sk); struct net *net = sock_net(sk); struct inet_timewait_sock *tw; @@ -316,6 +316,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo) #endif tcp_time_wait_init(sk, tcptw); + tcp_ao_time_wait(tcptw, tp); /* Get the TIME_WAIT timeout firing. */ if (timeo < rto) @@ -370,6 +371,7 @@ void tcp_twsk_destructor(struct sock *sk) call_rcu(&twsk->tw_md5_key->rcu, tcp_md5_twsk_free_rcu); } #endif + tcp_ao_destroy_sock(sk, true); } EXPORT_SYMBOL_GPL(tcp_twsk_destructor); diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index d4c7ca5d5cf1..c08dae53b03b 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -3968,7 +3968,7 @@ int tcp_connect(struct sock *sk) * then free up ao_info if allocated. */ if (needs_md5) { - tcp_ao_destroy_sock(sk); + tcp_ao_destroy_sock(sk, false); } else if (needs_ao) { tcp_clear_md5_list(sk); kfree(rcu_replace_pointer(tp->md5sig_info, NULL, diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 99ce31ef13b8..3e77a0c0cc39 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1118,7 +1118,10 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) if (sk->sk_state == TCP_NEW_SYN_RECV) goto skip_ao_sign; - ao_info = rcu_dereference(tcp_sk(sk)->ao_info); + if (sk->sk_state == TCP_TIME_WAIT) + ao_info = rcu_dereference(tcp_twsk(sk)->ao_info); + else + ao_info = rcu_dereference(tcp_sk(sk)->ao_info); if (!ao_info) goto skip_ao_sign; @@ -1177,24 +1180,60 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, struct tcp_md5sig_key *key, u8 tclass, - __be32 label, u32 priority, u32 txhash) + __be32 label, u32 priority, u32 txhash, + struct tcp_ao_key *ao_key, char *tkey, + u8 rcv_next, u32 ao_sne) { tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, - tclass, label, priority, txhash, NULL, NULL, 0, 0); + tclass, label, priority, txhash, + ao_key, tkey, rcv_next, ao_sne); } static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) { struct inet_timewait_sock *tw = inet_twsk(sk); struct tcp_timewait_sock *tcptw = tcp_twsk(sk); + struct tcp_ao_key *ao_key = NULL; + u8 *traffic_key = NULL; + u8 rcv_next = 0; + u32 ao_sne = 0; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao_info; + + /* FIXME: the segment to-be-acked is not verified yet */ + ao_info = rcu_dereference(tcptw->ao_info); + if (ao_info) { + const struct tcp_ao_hdr *aoh; + + /* Invalid TCP option size or twice included auth */ + if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) + goto out; + if (aoh) + ao_key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1); + } + if (ao_key) { + struct tcp_ao_key *rnext_key; + + traffic_key = snd_other_key(ao_key); + /* rcv_next switches to our rcv_next */ + rnext_key = READ_ONCE(ao_info->rnext_key); + rcv_next = rnext_key->rcvid; + ao_sne = tcp_ao_compute_sne(ao_info->snd_sne, + ao_info->snd_sne_seq, + tcptw->tw_snd_nxt); + } +#endif tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, tcp_time_stamp_raw() + tcptw->tw_ts_offset, tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority, - tw->tw_txhash); + tw->tw_txhash, ao_key, traffic_key, rcv_next, ao_sne); +#ifdef CONFIG_TCP_AO +out: +#endif inet_twsk_put(tw); } @@ -1221,7 +1260,7 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, req->ts_recent, sk->sk_bound_dev_if, tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index), ipv6_get_dsfield(ipv6_hdr(skb)), 0, sk->sk_priority, - tcp_rsk(req)->txhash); 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Fri, 12 May 2023 13:23:33 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:32 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 10/21] net/tcp: Wire TCP-AO to request sockets Date: Fri, 12 May 2023 21:23:00 +0100 Message-Id: <20230512202311.2845526-11-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Now when the new request socket is created from the listening socket, it's recorded what MKT was used by the peer. tcp_rsk_used_ao() is a new helper for checking if TCP-AO option was used to create the request socket. tcp_ao_copy_all_matching() will copy all keys that match the peer on the request socket, as well as preparing them for the usage (creating traffic keys). Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/linux/tcp.h | 18 ++++ include/net/tcp.h | 7 ++ include/net/tcp_ao.h | 22 +++++ net/ipv4/syncookies.c | 2 + net/ipv4/tcp_ao.c | 183 +++++++++++++++++++++++++++++++++++++++ net/ipv4/tcp_input.c | 15 ++++ net/ipv4/tcp_ipv4.c | 63 ++++++++++++-- net/ipv4/tcp_minisocks.c | 10 +++ net/ipv4/tcp_output.c | 42 ++++++--- net/ipv6/syncookies.c | 2 + net/ipv6/tcp_ao.c | 23 +++++ net/ipv6/tcp_ipv6.c | 75 +++++++++++++--- 12 files changed, 431 insertions(+), 31 deletions(-) diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 0c50a9aaa780..a8409d37c6b8 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -165,6 +165,11 @@ struct tcp_request_sock { * after data-in-SYN. */ u8 syn_tos; +#ifdef CONFIG_TCP_AO + u8 ao_keyid; + u8 ao_rcv_next; + u8 maclen; +#endif }; static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) @@ -172,6 +177,19 @@ static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) return (struct tcp_request_sock *)req; } +static inline bool tcp_rsk_used_ao(const struct request_sock *req) +{ + /* The real length of MAC is saved in the request socket, + * signing anything with zero-length makes no sense, so here is + * a little hack.. + */ +#ifndef CONFIG_TCP_AO + return false; +#else + return tcp_rsk(req)->maclen != 0; +#endif +} + struct tcp_sock { /* inet_connection_sock has to be the first member of tcp_sock */ struct inet_connection_sock inet_conn; diff --git a/include/net/tcp.h b/include/net/tcp.h index e93f9f0fb464..08b7a603f90d 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2143,6 +2143,13 @@ struct tcp_request_sock_ops { const struct sock *sk, const struct sk_buff *skb); #endif +#ifdef CONFIG_TCP_AO + struct tcp_ao_key *(*ao_lookup)(const struct sock *sk, + struct request_sock *req, + int sndid, int rcvid); + int (*ao_calc_key)(struct tcp_ao_key *mkt, u8 *key, + struct request_sock *sk); +#endif #ifdef CONFIG_SYN_COOKIES __u32 (*cookie_init_seq)(const struct sk_buff *skb, __u16 *mss); diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index a8632f258890..2faeaa3a857a 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -124,6 +124,9 @@ int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, sockptr_t optval, int optlen); struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, int sndid, int rcvid); +int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk, + struct request_sock *req, struct sk_buff *skb, + int family); int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, unsigned int len); void tcp_ao_destroy_sock(struct sock *sk, bool twsk); @@ -145,6 +148,11 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, __be32 sisn, __be32 disn, bool send); +int tcp_v4_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, + struct request_sock *req); +struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk, + struct request_sock *req, + int sndid, int rcvid); int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, const struct sock *sk, const struct sk_buff *skb, const u8 *tkey, int hash_offset, u32 sne); @@ -156,9 +164,17 @@ int tcp_v6_ao_hash_pseudoheader(struct tcp_sigpool *hp, int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, __be32 sisn, __be32 disn, bool send); +int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, + struct request_sock *req); +struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk, + const struct in6_addr *addr, + int sndid, int rcvid); struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); +struct tcp_ao_key *tcp_v6_ao_lookup_rsk(const struct sock *sk, + struct request_sock *req, + int sndid, int rcvid); int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, const struct sock *sk, const struct sk_buff *skb, const u8 *tkey, int hash_offset, u32 sne); @@ -171,6 +187,12 @@ void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, unsigned short int family); #else /* CONFIG_TCP_AO */ +static inline void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, + struct tcp_request_sock *treq, + unsigned short int family) +{ +} + static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port) diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 26fb97d1d4d9..9e3d7083af7d 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -394,6 +394,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb) treq->snt_synack = 0; treq->tfo_listener = false; + tcp_ao_syncookie(sk, skb, treq, AF_INET); + if (IS_ENABLED(CONFIG_SMC)) ireq->smc_ok = 0; diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 741d12eb46d5..92485f7bc4cd 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -181,6 +181,23 @@ static void tcp_ao_link_mkt(struct tcp_ao_info *ao, struct tcp_ao_key *mkt) hlist_add_head_rcu(&mkt->node, &ao->head); } +static struct tcp_ao_key *tcp_ao_copy_key(struct sock *sk, + struct tcp_ao_key *key) +{ + struct tcp_ao_key *new_key; + + new_key = sock_kmalloc(sk, tcp_ao_sizeof_key(key), + GFP_ATOMIC); + if (!new_key) + return NULL; + + *new_key = *key; + INIT_HLIST_NODE(&new_key->node); + tcp_sigpool_get(new_key->tcp_sigpool_id); + + return new_key; +} + static void tcp_ao_key_free_rcu(struct rcu_head *head) { struct tcp_ao_key *key = container_of(head, struct tcp_ao_key, rcu); @@ -293,6 +310,18 @@ static int tcp_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, return -EOPNOTSUPP; } +int tcp_v4_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, + struct request_sock *req) +{ + struct inet_request_sock *ireq = inet_rsk(req); + + return tcp_v4_ao_calc_key(mkt, key, + ireq->ir_loc_addr, ireq->ir_rmt_addr, + htons(ireq->ir_num), ireq->ir_rmt_port, + htonl(tcp_rsk(req)->snt_isn), + htonl(tcp_rsk(req)->rcv_isn)); +} + static int tcp_v4_ao_hash_pseudoheader(struct tcp_sigpool *hp, __be32 daddr, __be32 saddr, int nbytes) @@ -525,6 +554,16 @@ int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, } EXPORT_SYMBOL_GPL(tcp_v4_ao_hash_skb); +struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk, + struct request_sock *req, + int sndid, int rcvid) +{ + union tcp_ao_addr *addr = + (union tcp_ao_addr *)&inet_rsk(req)->ir_rmt_addr; + + return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0); +} + struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid) { @@ -533,6 +572,51 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0); } +static struct tcp_ao_key *tcp_ao_inbound_lookup(unsigned short int family, + const struct sock *sk, const struct sk_buff *skb, + int sndid, int rcvid) +{ + if (family == AF_INET) { + const struct iphdr *iph = ip_hdr(skb); + + return tcp_ao_do_lookup(sk, (union tcp_ao_addr *)&iph->saddr, + AF_INET, sndid, rcvid, 0); + } else { + const struct ipv6hdr *iph = ipv6_hdr(skb); + + return tcp_ao_do_lookup(sk, (union tcp_ao_addr *)&iph->saddr, + AF_INET6, sndid, rcvid, 0); + } +} + +void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, + struct tcp_request_sock *treq, + unsigned short int family) +{ + const struct tcphdr *th = tcp_hdr(skb); + const struct tcp_ao_hdr *aoh; + struct tcp_ao_key *key; + + treq->maclen = 0; + + /* Shouldn't fail as this has been called on this packet + * in tcp_inbound_hash() + */ + tcp_parse_auth_options(th, NULL, &aoh); + if (!aoh) + return; + + key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid); + if (!key) + /* Key not found, continue without TCP-AO */ + return; + + treq->ao_rcv_next = aoh->keyid; + treq->ao_keyid = aoh->rnext_keyid; + treq->maclen = tcp_ao_maclen(key); +} +EXPORT_SYMBOL_GPL(tcp_ao_syncookie); + static int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao, struct tcp_ao_key *ao_key) @@ -631,6 +715,105 @@ void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb) } } +int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk, + struct request_sock *req, struct sk_buff *skb, + int family) +{ + struct tcp_ao_key *key, *new_key, *first_key; + struct tcp_ao_info *new_ao, *ao; + struct hlist_node *key_head; + union tcp_ao_addr *addr; + bool match = false; + int ret = -ENOMEM; + + ao = rcu_dereference(tcp_sk(sk)->ao_info); + if (!ao) + return 0; + + /* New socket without TCP-AO on it */ + if (!tcp_rsk_used_ao(req)) + return 0; + + new_ao = tcp_ao_alloc_info(GFP_ATOMIC); + if (!new_ao) + return -ENOMEM; + new_ao->lisn = htonl(tcp_rsk(req)->snt_isn); + new_ao->risn = htonl(tcp_rsk(req)->rcv_isn); + new_ao->ao_required = ao->ao_required; + + if (family == AF_INET) { + addr = (union tcp_ao_addr *)&newsk->sk_daddr; +#if IS_ENABLED(CONFIG_IPV6) + } else if (family == AF_INET6) { + addr = (union tcp_ao_addr *)&newsk->sk_v6_daddr; +#endif + } else { + ret = -EAFNOSUPPORT; + goto free_ao; + } + + hlist_for_each_entry_rcu(key, &ao->head, node) { + if (tcp_ao_key_cmp(key, addr, key->prefixlen, family, + -1, -1, 0)) + continue; + + new_key = tcp_ao_copy_key(newsk, key); + if (!new_key) + goto free_and_exit; + + tcp_ao_cache_traffic_keys(newsk, new_ao, new_key); + tcp_ao_link_mkt(new_ao, new_key); + match = true; + } + + if (!match) { + /* RFC5925 (7.4.1) specifies that the TCP-AO status + * of a connection is determined on the initial SYN. + * At this point the connection was TCP-AO enabled, so + * it can't switch to being unsigned if peer's key + * disappears on the listening socket. + */ + ret = -EKEYREJECTED; + goto free_and_exit; + } + + key_head = rcu_dereference(hlist_first_rcu(&new_ao->head)); + first_key = hlist_entry_safe(key_head, struct tcp_ao_key, node); + + key = tcp_ao_established_key(new_ao, tcp_rsk(req)->ao_keyid, -1); + if (key) + new_ao->current_key = key; + else + new_ao->current_key = first_key; + + /* set rnext_key */ + key = tcp_ao_established_key(new_ao, -1, tcp_rsk(req)->ao_rcv_next); + if (key) + new_ao->rnext_key = key; + else + new_ao->rnext_key = first_key; + + new_ao->snd_sne_seq = tcp_rsk(req)->snt_isn; + new_ao->rcv_sne_seq = tcp_rsk(req)->rcv_isn; + + sk_gso_disable(newsk); + rcu_assign_pointer(tcp_sk(newsk)->ao_info, new_ao); + + return 0; + +free_and_exit: + hlist_for_each_entry_safe(key, key_head, &new_ao->head, node) { + hlist_del(&key->node); + tcp_sigpool_release(key->tcp_sigpool_id); + atomic_sub(tcp_ao_sizeof_key(key), &newsk->sk_omem_alloc); + kfree(key); + } +free_ao: + kfree(new_ao); + return ret; +} +EXPORT_SYMBOL_GPL(tcp_ao_copy_all_matching); + static bool tcp_ao_can_set_current_rnext(struct sock *sk) { /* There aren't current/rnext keys on TCP_LISTEN sockets */ diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 9626c703caed..959e4bdf2906 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -6957,6 +6957,10 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops, struct flowi fl; u8 syncookies; +#ifdef CONFIG_TCP_AO + const struct tcp_ao_hdr *aoh; +#endif + syncookies = READ_ONCE(net->ipv4.sysctl_tcp_syncookies); /* TW buckets are converted to open requests without @@ -7042,6 +7046,17 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops, inet_rsk(req)->ecn_ok = 0; } +#ifdef CONFIG_TCP_AO + if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) + goto drop_and_release; /* Invalid TCP options */ + if (aoh) { + tcp_rsk(req)->maclen = aoh->length - sizeof(struct tcp_ao_hdr); + tcp_rsk(req)->ao_rcv_next = aoh->keyid; + tcp_rsk(req)->ao_keyid = aoh->rnext_keyid; + } else { + tcp_rsk(req)->maclen = 0; + } +#endif tcp_rsk(req)->snt_isn = isn; tcp_rsk(req)->txhash = net_tx_rndhash(); tcp_rsk(req)->syn_tos = TCP_SKB_CB(skb)->ip_dsfield; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 7b82e5ee4073..40c7c568a84e 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1087,30 +1087,73 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, struct request_sock *req) { + struct tcp_md5sig_key *md5_key = NULL; + struct tcp_ao_key *ao_key = NULL; const union tcp_md5_addr *addr; - int l3index; + u8 keyid = 0; +#ifdef CONFIG_TCP_AO + u8 traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + const struct tcp_ao_hdr *aoh; +#else + u8 *traffic_key = NULL; +#endif /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV * sk->sk_state == TCP_SYN_RECV -> for Fast Open. */ u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt; + addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr; + if (tcp_rsk_used_ao(req)) { +#ifdef CONFIG_TCP_AO + /* Invalid TCP option size or twice included auth */ + if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) + return; + + if (!aoh) + return; + + ao_key = tcp_ao_do_lookup(sk, addr, AF_INET, + aoh->rnext_keyid, -1, 0); + if (unlikely(!ao_key)) { + /* Send ACK with any matching MKT for the peer */ + ao_key = tcp_ao_do_lookup(sk, addr, + AF_INET, -1, -1, 0); + /* Matching key disappeared (user removed the key?) + * let the handshake timeout. + */ + if (!ao_key) { + net_info_ratelimited("TCP-AO key for (%pI4, %d)->(%pI4, %d) suddenly disappeared, won't ACK new connection\n", + addr, + ntohs(tcp_hdr(skb)->source), + &ip_hdr(skb)->daddr, + ntohs(tcp_hdr(skb)->dest)); + return; + } + } + + keyid = aoh->keyid; + tcp_v4_ao_calc_key_rsk(ao_key, traffic_key, req); +#endif + } else { + int l3index; + + l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0; + md5_key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET); + } /* RFC 7323 2.3 * The window field (SEG.WND) of every outgoing segment, with the * exception of segments, MUST be right-shifted by * Rcv.Wind.Shift bits: */ - addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr; - l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0; tcp_v4_send_ack(sk, skb, seq, tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, req->ts_recent, 0, - tcp_md5_do_lookup(sk, l3index, addr, AF_INET), - NULL, NULL, 0, 0, + md5_key, ao_key, traffic_key, keyid, 0, inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, ip_hdr(skb)->tos); } @@ -1650,6 +1693,10 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { .req_md5_lookup = tcp_v4_md5_lookup, .calc_md5_hash = tcp_v4_md5_hash_skb, #endif +#ifdef CONFIG_TCP_AO + .ao_lookup = tcp_v4_ao_lookup_rsk, + .ao_calc_key = tcp_v4_ao_calc_key_rsk, +#endif #ifdef CONFIG_SYN_COOKIES .cookie_init_seq = cookie_v4_init_sequence, #endif @@ -1751,12 +1798,16 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, /* Copy over the MD5 key from the original socket */ addr = (union tcp_md5_addr *)&newinet->inet_daddr; key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET); - if (key) { + if (key && !tcp_rsk_used_ao(req)) { if (tcp_md5_key_copy(newsk, addr, AF_INET, 32, l3index, key)) goto put_and_exit; sk_gso_disable(newsk); } #endif +#ifdef CONFIG_TCP_AO + if (tcp_ao_copy_all_matching(sk, newsk, req, skb, AF_INET)) + goto put_and_exit; /* OOM, release back memory */ +#endif if (__inet_inherit_port(sk, newsk) < 0) goto put_and_exit; diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c index ea6e5c97c66a..6577618d9ed4 100644 --- a/net/ipv4/tcp_minisocks.c +++ b/net/ipv4/tcp_minisocks.c @@ -506,6 +506,9 @@ struct sock *tcp_create_openreq_child(const struct sock *sk, const struct tcp_sock *oldtp; struct tcp_sock *newtp; u32 seq; +#ifdef CONFIG_TCP_AO + struct tcp_ao_key *ao_key; +#endif if (!newsk) return NULL; @@ -584,6 +587,13 @@ struct sock *tcp_create_openreq_child(const struct sock *sk, if (treq->af_specific->req_md5_lookup(sk, req_to_sk(req))) newtp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED; #endif +#ifdef CONFIG_TCP_AO + newtp->ao_info = NULL; + ao_key = treq->af_specific->ao_lookup(sk, req, + tcp_rsk(req)->ao_keyid, -1); + if (ao_key) + newtp->tcp_header_len += tcp_ao_len(ao_key); + #endif if (skb->len >= TCP_MSS_DEFAULT + newtp->tcp_header_len) newicsk->icsk_ack.last_seg_size = skb->len - newtp->tcp_header_len; newtp->rx_opt.mss_clamp = req->mss; diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index c08dae53b03b..5344e6564b56 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -606,6 +606,7 @@ static void bpf_skops_write_hdr_opt(struct sock *sk, struct sk_buff *skb, * (but it may well be that other scenarios fail similarly). */ static void tcp_options_write(struct tcphdr *th, struct tcp_sock *tp, + const struct tcp_request_sock *tcprsk, struct tcp_out_options *opts, struct tcp_ao_key *ao_key) { @@ -620,23 +621,36 @@ static void tcp_options_write(struct tcphdr *th, struct tcp_sock *tp, ptr += 4; } #ifdef CONFIG_TCP_AO - if (unlikely(OPTION_AO & options) && tp) { - struct tcp_ao_key *rnext_key; - struct tcp_ao_info *ao_info; + if (unlikely(OPTION_AO & options)) { u8 maclen; if (WARN_ON_ONCE(!ao_key)) goto out_ao; - ao_info = rcu_dereference_check(tp->ao_info, - lockdep_sock_is_held(&tp->inet_conn.icsk_inet.sk)); - rnext_key = READ_ONCE(ao_info->rnext_key); - if (WARN_ON_ONCE(!rnext_key)) - goto out_ao; maclen = tcp_ao_maclen(ao_key); - *ptr++ = htonl((TCPOPT_AO << 24) | - (tcp_ao_len(ao_key) << 16) | - (ao_key->sndid << 8) | - (rnext_key->rcvid)); + + if (tp) { + struct tcp_ao_key *rnext_key; + struct tcp_ao_info *ao_info; + + ao_info = rcu_dereference_check(tp->ao_info, + lockdep_sock_is_held(&tp->inet_conn.icsk_inet.sk)); + rnext_key = READ_ONCE(ao_info->rnext_key); + if (WARN_ON_ONCE(!rnext_key)) + goto out_ao; + *ptr++ = htonl((TCPOPT_AO << 24) | + (tcp_ao_len(ao_key) << 16) | + (ao_key->sndid << 8) | + (rnext_key->rcvid)); + } else if (tcprsk) { + u8 aolen = maclen + sizeof(struct tcp_ao_hdr); + + *ptr++ = htonl((TCPOPT_AO << 24) | (aolen << 16) | + (tcprsk->ao_keyid << 8) | + (tcprsk->ao_rcv_next)); + } else { + WARN_ON_ONCE(1); + goto out_ao; + } opts->hash_location = (__u8 *)ptr; ptr += maclen / sizeof(*ptr); if (unlikely(maclen % sizeof(*ptr))) { @@ -1412,7 +1426,7 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, th->window = htons(min(tp->rcv_wnd, 65535U)); } - tcp_options_write(th, tp, &opts, ao_key); + tcp_options_write(th, tp, NULL, &opts, ao_key); #ifdef CONFIG_TCP_MD5SIG /* Calculate the MD5 hash, as we have all we need now */ @@ -3703,7 +3717,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, /* RFC1323: The window in SYN & SYN/ACK segments is never scaled. */ th->window = htons(min(req->rsk_rcv_wnd, 65535U)); - tcp_options_write(th, NULL, &opts, NULL); + tcp_options_write(th, NULL, NULL, &opts, NULL); th->doff = (tcp_header_size >> 2); TCP_INC_STATS(sock_net(sk), TCP_MIB_OUTSEGS); diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index 5014aa663452..ad7a8caa7b2a 100644 --- a/net/ipv6/syncookies.c +++ b/net/ipv6/syncookies.c @@ -214,6 +214,8 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) treq->snt_isn = cookie; treq->ts_off = 0; treq->txhash = net_tx_rndhash(); + tcp_ao_syncookie(sk, skb, treq, AF_INET6); + if (IS_ENABLED(CONFIG_SMC)) ireq->smc_ok = 0; diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c index 4a21bcab733c..17acb2fd5182 100644 --- a/net/ipv6/tcp_ao.c +++ b/net/ipv6/tcp_ao.c @@ -53,6 +53,19 @@ int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, htons(sk->sk_num), disn, sisn); } +int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, + struct request_sock *req) +{ + struct inet_request_sock *ireq = inet_rsk(req); + + return tcp_v6_ao_calc_key(mkt, key, + &ireq->ir_v6_loc_addr, &ireq->ir_v6_rmt_addr, + htons(ireq->ir_num), ireq->ir_rmt_port, + htonl(tcp_rsk(req)->snt_isn), + htonl(tcp_rsk(req)->rcv_isn)); +} +EXPORT_SYMBOL_GPL(tcp_v6_ao_calc_key_rsk); + struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk, const struct in6_addr *addr, int sndid, int rcvid) @@ -71,6 +84,16 @@ struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, } EXPORT_SYMBOL_GPL(tcp_v6_ao_lookup); +struct tcp_ao_key *tcp_v6_ao_lookup_rsk(const struct sock *sk, + struct request_sock *req, + int sndid, int rcvid) +{ + struct in6_addr *addr = &inet_rsk(req)->ir_v6_rmt_addr; + + return tcp_v6_ao_do_lookup(sk, addr, sndid, rcvid); +} +EXPORT_SYMBOL_GPL(tcp_v6_ao_lookup_rsk); + int tcp_v6_ao_hash_pseudoheader(struct tcp_sigpool *hp, const struct in6_addr *daddr, const struct in6_addr *saddr, int nbytes) diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 3e77a0c0cc39..386160140208 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -846,6 +846,10 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { .req_md5_lookup = tcp_v6_md5_lookup, .calc_md5_hash = tcp_v6_md5_hash_skb, #endif +#ifdef CONFIG_TCP_AO + .ao_lookup = tcp_v6_ao_lookup_rsk, + .ao_calc_key = tcp_v6_ao_calc_key_rsk, +#endif #ifdef CONFIG_SYN_COOKIES .cookie_init_seq = cookie_v6_init_sequence, #endif @@ -1240,9 +1244,51 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, struct request_sock *req) { + struct tcp_md5sig_key *md5_key = NULL; + struct tcp_ao_key *ao_key = NULL; + const struct in6_addr *addr; + u8 keyid = 0; +#ifdef CONFIG_TCP_AO + char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + const struct tcp_ao_hdr *aoh; +#else + u8 *traffic_key = NULL; +#endif int l3index; l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; + addr = &ipv6_hdr(skb)->saddr; + + if (tcp_rsk_used_ao(req)) { +#ifdef CONFIG_TCP_AO + /* Invalid TCP option size or twice included auth */ + if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) + return; + if (!aoh) + return; + ao_key = tcp_v6_ao_do_lookup(sk, addr, aoh->rnext_keyid, -1); + if (unlikely(!ao_key)) { + /* Send ACK with any matching MKT for the peer */ + ao_key = tcp_v6_ao_do_lookup(sk, addr, -1, -1); + /* Matching key disappeared (user removed the key?) + * let the handshake timeout. + */ + if (!ao_key) { + net_info_ratelimited("TCP-AO key for (%pI6, %d)->(%pI6, %d) suddenly disappeared, won't ACK new connection\n", + addr, + ntohs(tcp_hdr(skb)->source), + &ipv6_hdr(skb)->daddr, + ntohs(tcp_hdr(skb)->dest)); + return; + } + } + + keyid = aoh->keyid; + tcp_v6_ao_calc_key_rsk(ao_key, traffic_key, req); +#endif + } else { + md5_key = tcp_v6_md5_do_lookup(sk, addr, l3index); + } /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV * sk->sk_state == TCP_SYN_RECV -> for Fast Open. @@ -1258,9 +1304,9 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, req->ts_recent, sk->sk_bound_dev_if, - tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index), + md5_key, ipv6_get_dsfield(ipv6_hdr(skb)), 0, sk->sk_priority, - tcp_rsk(req)->txhash, NULL, NULL, 0, 0); + tcp_rsk(req)->txhash, ao_key, traffic_key, keyid, 0); } @@ -1490,19 +1536,26 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff * #ifdef CONFIG_TCP_MD5SIG l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); - /* Copy over the MD5 key from the original socket */ - key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index); - if (key) { - const union tcp_md5_addr *addr; + if (!tcp_rsk_used_ao(req)) { + /* Copy over the MD5 key from the original socket */ + key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index); + if (key) { + const union tcp_md5_addr *addr; - addr = (union tcp_md5_addr *)&newsk->sk_v6_daddr; - if (tcp_md5_key_copy(newsk, addr, AF_INET6, 128, l3index, key)) { - inet_csk_prepare_forced_close(newsk); - tcp_done(newsk); - goto out; + addr = (union tcp_md5_addr *)&newsk->sk_v6_daddr; + if (tcp_md5_key_copy(newsk, addr, AF_INET6, 128, l3index, key)) { + inet_csk_prepare_forced_close(newsk); + tcp_done(newsk); + goto out; + } } } #endif +#ifdef CONFIG_TCP_AO + /* Copy over tcp_ao_info if any */ + if (tcp_ao_copy_all_matching(sk, newsk, req, skb, AF_INET6)) + goto out; /* OOM */ +#endif if (__inet_inherit_port(sk, newsk) < 0) { inet_csk_prepare_forced_close(newsk); From patchwork Fri May 12 20:23:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239667 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 21CF220989 for ; 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Fri, 12 May 2023 13:23:34 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 11/21] net/tcp: Sign SYN-ACK segments with TCP-AO Date: Fri, 12 May 2023 21:23:01 +0100 Message-Id: <20230512202311.2845526-12-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Similarly to RST segments, wire SYN-ACKs to TCP-AO. tcp_rsk_used_ao() is handy here to check if the request socket used AO and needs a signature on the outgoing segments. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 4 ++++ include/net/tcp_ao.h | 6 ++++++ net/ipv4/tcp_ao.c | 14 +++++++++++++ net/ipv4/tcp_ipv4.c | 1 + net/ipv4/tcp_output.c | 48 +++++++++++++++++++++++++++++++++++++------ net/ipv6/tcp_ao.c | 15 ++++++++++++++ net/ipv6/tcp_ipv6.c | 1 + 7 files changed, 83 insertions(+), 6 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 08b7a603f90d..433e9c83e4ae 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2149,6 +2149,10 @@ struct tcp_request_sock_ops { int sndid, int rcvid); int (*ao_calc_key)(struct tcp_ao_key *mkt, u8 *key, struct request_sock *sk); + int (*ao_synack_hash)(char *ao_hash, struct tcp_ao_key *mkt, + struct request_sock *req, + const struct sk_buff *skb, + int hash_offset, u32 sne); #endif #ifdef CONFIG_SYN_COOKIES __u32 (*cookie_init_seq)(const struct sk_buff *skb, diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 2faeaa3a857a..eacb4925f4a9 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -145,6 +145,9 @@ int tcp_ao_hash_hdr(unsigned short family, char *ao_hash, int tcp_v4_parse_ao(struct sock *sk, int optname, sockptr_t optval, int optlen); struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); +int tcp_v4_ao_synack_hash(char *ao_hash, struct tcp_ao_key *mkt, + struct request_sock *req, const struct sk_buff *skb, + int hash_offset, u32 sne); int tcp_v4_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, __be32 sisn, __be32 disn, bool send); @@ -180,6 +183,9 @@ int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, const u8 *tkey, int hash_offset, u32 sne); int tcp_v6_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen); +int tcp_v6_ao_synack_hash(char *ao_hash, struct tcp_ao_key *ao_key, + struct request_sock *req, const struct sk_buff *skb, + int hash_offset, u32 sne); void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb); void tcp_ao_connect_init(struct sock *sk); void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 92485f7bc4cd..bfd944fa4483 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -554,6 +554,20 @@ int tcp_v4_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, } EXPORT_SYMBOL_GPL(tcp_v4_ao_hash_skb); +int tcp_v4_ao_synack_hash(char *ao_hash, struct tcp_ao_key *ao_key, + struct request_sock *req, const struct sk_buff *skb, + int hash_offset, u32 sne) +{ + char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + + tcp_v4_ao_calc_key_rsk(ao_key, traffic_key, req); + + tcp_ao_hash_skb(AF_INET, ao_hash, ao_key, req_to_sk(req), skb, + traffic_key, hash_offset, sne); + + return 0; +} + struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk, struct request_sock *req, int sndid, int rcvid) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 40c7c568a84e..ca28517644d5 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1696,6 +1696,7 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v4_ao_lookup_rsk, .ao_calc_key = tcp_v4_ao_calc_key_rsk, + .ao_synack_hash = tcp_v4_ao_synack_hash, #endif #ifdef CONFIG_SYN_COOKIES .cookie_init_seq = cookie_v4_init_sequence, diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 5344e6564b56..f055ef225c37 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -3638,6 +3638,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, struct inet_request_sock *ireq = inet_rsk(req); const struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_key *md5 = NULL; + struct tcp_ao_key *ao_key = NULL; struct tcp_out_options opts; struct sk_buff *skb; int tcp_header_size; @@ -3688,16 +3689,43 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, tcp_rsk(req)->snt_synack = tcp_skb_timestamp_us(skb); } -#ifdef CONFIG_TCP_MD5SIG +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) rcu_read_lock(); - md5 = tcp_rsk(req)->af_specific->req_md5_lookup(sk, req_to_sk(req)); #endif + if (tcp_rsk_used_ao(req)) { +#ifdef CONFIG_TCP_AO + u8 maclen = tcp_rsk(req)->maclen; + u8 keyid = tcp_rsk(req)->ao_keyid; + + ao_key = tcp_sk(sk)->af_specific->ao_lookup(sk, req_to_sk(req), + keyid, -1); + /* If there is no matching key - avoid sending anything, + * especially usigned segments. It could try harder and lookup + * for another peer-matching key, but the peer has requested + * ao_keyid (RFC5925 RNextKeyID), so let's keep it simple here. + */ + if (unlikely(!ao_key || tcp_ao_maclen(ao_key) != maclen)) { + rcu_read_unlock(); + skb_dst_drop(skb); + kfree_skb(skb); + net_warn_ratelimited("TCP-AO: the keyid %u with maclen %u|%u from SYN packet is not present - not sending SYNACK\n", + keyid, maclen, + ao_key ? tcp_ao_maclen(ao_key) : 0); + return NULL; + } +#endif + } else { +#ifdef CONFIG_TCP_MD5SIG + md5 = tcp_rsk(req)->af_specific->req_md5_lookup(sk, + req_to_sk(req)); +#endif + } skb_set_hash(skb, tcp_rsk(req)->txhash, PKT_HASH_TYPE_L4); /* bpf program will be interested in the tcp_flags */ TCP_SKB_CB(skb)->tcp_flags = TCPHDR_SYN | TCPHDR_ACK; tcp_header_size = tcp_synack_options(sk, req, mss, skb, &opts, md5, - NULL, foc, synack_type, - syn_skb) + sizeof(*th); + ao_key, foc, synack_type, syn_skb) + + sizeof(*th); skb_push(skb, tcp_header_size); skb_reset_transport_header(skb); @@ -3717,7 +3745,7 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, /* RFC1323: The window in SYN & SYN/ACK segments is never scaled. */ th->window = htons(min(req->rsk_rcv_wnd, 65535U)); - tcp_options_write(th, NULL, NULL, &opts, NULL); + tcp_options_write(th, NULL, tcp_rsk(req), &opts, ao_key); th->doff = (tcp_header_size >> 2); TCP_INC_STATS(sock_net(sk), TCP_MIB_OUTSEGS); @@ -3725,7 +3753,15 @@ struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, /* Okay, we have all we need - do the md5 hash if needed */ if (md5) tcp_rsk(req)->af_specific->calc_md5_hash(opts.hash_location, - md5, req_to_sk(req), skb); + md5, req_to_sk(req), skb); +#endif +#ifdef CONFIG_TCP_AO + if (ao_key) + tcp_rsk(req)->af_specific->ao_synack_hash(opts.hash_location, + ao_key, req, skb, + opts.hash_location - (u8 *)th, 0); +#endif +#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) rcu_read_unlock(); #endif diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c index 17acb2fd5182..bc032e441ef8 100644 --- a/net/ipv6/tcp_ao.c +++ b/net/ipv6/tcp_ao.c @@ -128,3 +128,18 @@ int tcp_v6_parse_ao(struct sock *sk, int cmd, return tcp_parse_ao(sk, cmd, AF_INET6, optval, optlen); } EXPORT_SYMBOL_GPL(tcp_v6_parse_ao); + +int tcp_v6_ao_synack_hash(char *ao_hash, struct tcp_ao_key *ao_key, + struct request_sock *req, const struct sk_buff *skb, + int hash_offset, u32 sne) +{ + char traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + + tcp_v6_ao_calc_key_rsk(ao_key, traffic_key, req); + + tcp_ao_hash_skb(AF_INET6, ao_hash, ao_key, req_to_sk(req), skb, + traffic_key, hash_offset, sne); + + return 0; +} +EXPORT_SYMBOL_GPL(tcp_v6_ao_synack_hash); diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 386160140208..b2f17d6ec5c3 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -849,6 +849,7 @@ const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { #ifdef CONFIG_TCP_AO .ao_lookup = tcp_v6_ao_lookup_rsk, .ao_calc_key = tcp_v6_ao_calc_key_rsk, + .ao_synack_hash = tcp_v6_ao_synack_hash, #endif #ifdef CONFIG_SYN_COOKIES .cookie_init_seq = cookie_v6_init_sequence, From patchwork Fri May 12 20:23:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239669 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A704923D5B for ; 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Fri, 12 May 2023 13:23:35 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 12/21] net/tcp: Verify inbound TCP-AO signed segments Date: Fri, 12 May 2023 21:23:02 +0100 Message-Id: <20230512202311.2845526-13-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Now there is a common function to verify signature on TCP segments: tcp_inbound_hash(). It has checks for all possible cross-interactions with MD5 signs as well as with unsigned segments. The rules from RFC5925 are: (1) Any TCP segment can have at max only one signature. (2) TCP connections can't switch between using TCP-MD5 and TCP-AO. (3) TCP-AO connections can't stop using AO, as well as unsigned connections can't suddenly start using AO. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/dropreason-core.h | 23 +++++ include/net/tcp.h | 53 ++++++++++- include/net/tcp_ao.h | 17 ++++ net/ipv4/tcp.c | 39 ++------- net/ipv4/tcp_ao.c | 160 ++++++++++++++++++++++++++++++++++ net/ipv4/tcp_ipv4.c | 10 +-- net/ipv6/tcp_ao.c | 13 +++ net/ipv6/tcp_ipv6.c | 11 +-- 8 files changed, 283 insertions(+), 43 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index a2b953b57689..0ff272d3b680 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -20,9 +20,14 @@ FN(IP_NOPROTO) \ FN(SOCKET_RCVBUFF) \ FN(PROTO_MEM) \ + FN(TCP_AUTH_HDR) \ FN(TCP_MD5NOTFOUND) \ FN(TCP_MD5UNEXPECTED) \ FN(TCP_MD5FAILURE) \ + FN(TCP_AONOTFOUND) \ + FN(TCP_AOUNEXPECTED) \ + FN(TCP_AOKEYNOTFOUND) \ + FN(TCP_AOFAILURE) \ FN(SOCKET_BACKLOG) \ FN(TCP_FLAGS) \ FN(TCP_ZEROWINDOW) \ @@ -139,6 +144,11 @@ enum skb_drop_reason { * drop out of udp_memory_allocated. */ SKB_DROP_REASON_PROTO_MEM, + /** + * @SKB_DROP_REASON_TCP_AUTH_HDR: TCP-MD5 or TCP-AO hashes are met + * twice or set incorrectly. + */ + SKB_DROP_REASON_TCP_AUTH_HDR, /** * @SKB_DROP_REASON_TCP_MD5NOTFOUND: no MD5 hash and one expected, * corresponding to LINUX_MIB_TCPMD5NOTFOUND @@ -154,6 +164,19 @@ enum skb_drop_reason { * to LINUX_MIB_TCPMD5FAILURE */ SKB_DROP_REASON_TCP_MD5FAILURE, + /** + * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected + */ + SKB_DROP_REASON_TCP_AONOTFOUND, + /** + * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it + * was not expected. + */ + SKB_DROP_REASON_TCP_AOUNEXPECTED, + /** @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown */ + SKB_DROP_REASON_TCP_AOKEYNOTFOUND, + /** @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong */ + SKB_DROP_REASON_TCP_AOFAILURE, /** * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( * see LINUX_MIB_TCPBACKLOGDROP) diff --git a/include/net/tcp.h b/include/net/tcp.h index 433e9c83e4ae..5fe1b91854aa 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1736,7 +1736,7 @@ tcp_md5_do_lookup_any_l3index(const struct sock *sk, enum skb_drop_reason tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, const void *saddr, const void *daddr, - int family, int dif, int sdif); + int family, int l3index, const __u8 *hash_location); #define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_key) @@ -1758,7 +1758,7 @@ tcp_md5_do_lookup_any_l3index(const struct sock *sk, static inline enum skb_drop_reason tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, const void *saddr, const void *daddr, - int family, int dif, int sdif) + int family, int l3index, const __u8 *hash_location) { return SKB_NOT_DROPPED_YET; } @@ -2587,4 +2587,53 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr, return false; } +/* Called with rcu_read_lock() */ +static inline enum skb_drop_reason +tcp_inbound_hash(struct sock *sk, const struct request_sock *req, + const struct sk_buff *skb, + const void *saddr, const void *daddr, + int family, int dif, int sdif) +{ + const struct tcphdr *th = tcp_hdr(skb); + const struct tcp_ao_hdr *aoh; + const __u8 *md5_location; + int l3index; + + /* Invalid option or two times meet any of auth options */ + if (tcp_parse_auth_options(th, &md5_location, &aoh)) + return SKB_DROP_REASON_TCP_AUTH_HDR; + + if (req) { + if (tcp_rsk_used_ao(req) != !!aoh) + return SKB_DROP_REASON_TCP_AOFAILURE; + } + + /* sdif set, means packet ingressed via a device + * in an L3 domain and dif is set to the l3mdev + */ + l3index = sdif ? dif : 0; + + /* Fast path: unsigned segments */ + if (likely(!md5_location && !aoh)) { + /* Drop if there's TCP-MD5 or TCP-AO key with any rcvid/sndid + * for the remote peer. On TCP-AO established connection + * the last key is impossible to remove, so there's + * always at least one current_key. + */ + if (tcp_ao_required(sk, saddr, family)) + return SKB_DROP_REASON_TCP_AONOTFOUND; + if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); + return SKB_DROP_REASON_TCP_MD5NOTFOUND; + } + return SKB_NOT_DROPPED_YET; + } + + if (aoh) + return tcp_inbound_ao_hash(sk, skb, family, req, aoh); + + return tcp_inbound_md5_hash(sk, skb, saddr, daddr, family, + l3index, md5_location); +} + #endif /* _TCP_H */ diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index eacb4925f4a9..fe2f4f62f917 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -116,6 +116,9 @@ struct tcp6_ao_context { __be32 disn; }; +#define TCP_AO_ESTABLISHED (TCPF_ESTABLISHED|TCPF_FIN_WAIT1|TCPF_FIN_WAIT2|\ + TCPF_CLOSE|TCPF_CLOSE_WAIT|TCPF_LAST_ACK|TCPF_CLOSING) + int tcp_ao_hash_skb(unsigned short int family, char *ao_hash, struct tcp_ao_key *key, const struct sock *sk, const struct sk_buff *skb, @@ -132,6 +135,10 @@ int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, void tcp_ao_destroy_sock(struct sock *sk, bool twsk); u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq); void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp); +enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, + const struct sk_buff *skb, unsigned short int family, + const struct request_sock *req, + const struct tcp_ao_hdr *aoh); struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port); @@ -164,6 +171,9 @@ struct tcp_sigpool; int tcp_v6_ao_hash_pseudoheader(struct tcp_sigpool *hp, const struct in6_addr *daddr, const struct in6_addr *saddr, int nbytes); +int tcp_v6_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key, + const struct sk_buff *skb, __be32 sisn, + __be32 disn); int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, __be32 sisn, __be32 disn, bool send); @@ -199,6 +209,13 @@ static inline void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, { } +static inline enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, + const struct sk_buff *skb, unsigned short int family, + const struct request_sock *req, const struct tcp_ao_hdr *aoh) +{ + return SKB_NOT_DROPPED_YET; +} + static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index fe30260be4c2..e8c62fbc7ab7 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4479,42 +4479,23 @@ EXPORT_SYMBOL(tcp_md5_hash_key); enum skb_drop_reason tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, const void *saddr, const void *daddr, - int family, int dif, int sdif) + int family, int l3index, const __u8 *hash_location) { - /* - * This gets called for each TCP segment that arrives - * so we want to be efficient. + /* This gets called for each TCP segment that has TCP-MD5 option. * We have 3 drop cases: * o No MD5 hash and one expected. * o MD5 hash and we're not expecting one. * o MD5 hash and its wrong. */ - const __u8 *hash_location = NULL; - struct tcp_md5sig_key *hash_expected; const struct tcphdr *th = tcp_hdr(skb); const struct tcp_sock *tp = tcp_sk(sk); - int genhash, l3index; + struct tcp_md5sig_key *key; + int genhash; u8 newhash[16]; - /* sdif set, means packet ingressed via a device - * in an L3 domain and dif is set to the l3mdev - */ - l3index = sdif ? dif : 0; + key = tcp_md5_do_lookup(sk, l3index, saddr, family); - hash_expected = tcp_md5_do_lookup(sk, l3index, saddr, family); - if (tcp_parse_auth_options(th, &hash_location, NULL)) - return true; - - /* We've parsed the options - do we have a hash? */ - if (!hash_expected && !hash_location) - return SKB_NOT_DROPPED_YET; - - if (hash_expected && !hash_location) { - NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); - return SKB_DROP_REASON_TCP_MD5NOTFOUND; - } - - if (!hash_expected && hash_location) { + if (!key && hash_location) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); return SKB_DROP_REASON_TCP_MD5UNEXPECTED; } @@ -4524,14 +4505,10 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, * IPv4-mapped case. */ if (family == AF_INET) - genhash = tcp_v4_md5_hash_skb(newhash, - hash_expected, - NULL, skb); + genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb); else - genhash = tp->af_specific->calc_md5_hash(newhash, - hash_expected, + genhash = tp->af_specific->calc_md5_hash(newhash, key, NULL, skb); - if (genhash || memcmp(hash_location, newhash, 16) != 0) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); if (family == AF_INET) { diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index bfd944fa4483..d43eff59e82f 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -322,6 +322,30 @@ int tcp_v4_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, htonl(tcp_rsk(req)->rcv_isn)); } +static int tcp_v4_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key, + const struct sk_buff *skb, + __be32 sisn, __be32 disn) +{ + const struct iphdr *iph = ip_hdr(skb); + const struct tcphdr *th = tcp_hdr(skb); + + return tcp_v4_ao_calc_key(mkt, key, iph->saddr, iph->daddr, + th->source, th->dest, sisn, disn); +} + +static int tcp_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key, + const struct sk_buff *skb, __be32 sisn, + __be32 disn, int family) +{ + if (family == AF_INET) + return tcp_v4_ao_calc_key_skb(mkt, key, skb, sisn, disn); +#if IS_ENABLED(CONFIG_IPV6) + else if (family == AF_INET6) + return tcp_v6_ao_calc_key_skb(mkt, key, skb, sisn, disn); +#endif + return -EAFNOSUPPORT; +} + static int tcp_v4_ao_hash_pseudoheader(struct tcp_sigpool *hp, __be32 daddr, __be32 saddr, int nbytes) @@ -631,6 +655,142 @@ void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, } EXPORT_SYMBOL_GPL(tcp_ao_syncookie); +static enum skb_drop_reason +tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, + unsigned short int family, struct tcp_ao_info *info, + const struct tcp_ao_hdr *aoh, struct tcp_ao_key *key, + u8 *traffic_key, u8 *phash, u32 sne) +{ + unsigned char newhash[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + u8 maclen = aoh->length - sizeof(struct tcp_ao_hdr); + const struct tcphdr *th = tcp_hdr(skb); + + if (maclen != tcp_ao_maclen(key)) + return SKB_DROP_REASON_TCP_AOFAILURE; + + /* XXX: make it per-AF callback? */ + tcp_ao_hash_skb(family, newhash, key, sk, skb, traffic_key, + (phash - (u8 *)th), sne); + if (memcmp(phash, newhash, maclen)) + return SKB_DROP_REASON_TCP_AOFAILURE; + return SKB_NOT_DROPPED_YET; +} + +enum skb_drop_reason +tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, + unsigned short int family, const struct request_sock *req, + const struct tcp_ao_hdr *aoh) +{ + u8 key_buf[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; + const struct tcphdr *th = tcp_hdr(skb); + u8 *phash = (u8 *)(aoh + 1); /* hash goes just after the header */ + struct tcp_ao_info *info; + struct tcp_ao_key *key; + __be32 sisn, disn; + u8 *traffic_key; + u32 sne = 0; + + info = rcu_dereference(tcp_sk(sk)->ao_info); + if (!info) + return SKB_DROP_REASON_TCP_AOUNEXPECTED; + + if (unlikely(th->syn)) { + sisn = th->seq; + disn = 0; + } + + /* Fast-path */ + /* TODO: fix fastopen and simultaneous open (TCPF_SYN_RECV) */ + if (likely((1 << sk->sk_state) & (TCP_AO_ESTABLISHED | TCPF_SYN_RECV))) { + enum skb_drop_reason err; + struct tcp_ao_key *current_key; + + /* Check if this socket's rnext_key matches the keyid in the + * packet. If not we lookup the key based on the keyid + * matching the rcvid in the mkt. + */ + key = READ_ONCE(info->rnext_key); + if (key->rcvid != aoh->keyid) { + key = tcp_ao_established_key(info, -1, aoh->keyid); + if (!key) + goto key_not_found; + } + + /* Delayed retransmitted SYN */ + if (unlikely(th->syn && !th->ack)) + goto verify_hash; + + sne = tcp_ao_compute_sne(info->rcv_sne, info->rcv_sne_seq, + ntohl(th->seq)); + /* Established socket, traffic key are cached */ + traffic_key = rcv_other_key(key); + err = tcp_ao_verify_hash(sk, skb, family, info, aoh, key, + traffic_key, phash, sne); + if (err) + return err; + current_key = READ_ONCE(info->current_key); + /* Key rotation: the peer asks us to use new key (RNext) */ + if (unlikely(aoh->rnext_keyid != current_key->sndid)) { + /* If the key is not found we do nothing. */ + key = tcp_ao_established_key(info, aoh->rnext_keyid, -1); + if (key) + /* pairs with tcp_ao_del_cmd */ + WRITE_ONCE(info->current_key, key); + } + return SKB_NOT_DROPPED_YET; + } + + /* Lookup key based on peer address and keyid. + * current_key and rnext_key must not be used on tcp listen + * sockets as otherwise: + * - request sockets would race on those key pointers + * - tcp_ao_del_cmd() allows async key removal + */ + key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid); + if (!key) + goto key_not_found; + + if (th->syn && !th->ack) + goto verify_hash; + + if (sk->sk_state == TCP_LISTEN) { + /* Make the initial syn the likely case here */ + if (unlikely(req)) { + sne = tcp_ao_compute_sne(0, tcp_rsk(req)->rcv_isn, + ntohl(th->seq)); + sisn = htonl(tcp_rsk(req)->rcv_isn); + disn = htonl(tcp_rsk(req)->snt_isn); + } else if (unlikely(th->ack && !th->syn)) { + /* Possible syncookie packet */ + sisn = htonl(ntohl(th->seq) - 1); + disn = htonl(ntohl(th->ack_seq) - 1); + sne = tcp_ao_compute_sne(0, ntohl(sisn), + ntohl(th->seq)); + } else if (unlikely(!th->syn)) { + /* no way to figure out initial sisn/disn - drop */ + return SKB_DROP_REASON_TCP_FLAGS; + } + } else if (sk->sk_state == TCP_SYN_SENT) { + disn = info->lisn; + if (th->syn) + sisn = th->seq; + else + sisn = info->risn; + } else { + WARN_ONCE(1, "TCP-AO: Unknown sk_state %d", sk->sk_state); + return SKB_DROP_REASON_TCP_AOFAILURE; + } +verify_hash: + traffic_key = key_buf; + tcp_ao_calc_key_skb(key, traffic_key, skb, sisn, disn, family); + return tcp_ao_verify_hash(sk, skb, family, info, aoh, key, + traffic_key, phash, sne); + +key_not_found: + return SKB_DROP_REASON_TCP_AOKEYNOTFOUND; +} +EXPORT_SYMBOL_GPL(tcp_inbound_ao_hash); + static int tcp_ao_cache_traffic_keys(const struct sock *sk, struct tcp_ao_info *ao, struct tcp_ao_key *ao_key) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index ca28517644d5..ab8152c51a62 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2218,9 +2218,9 @@ int tcp_v4_rcv(struct sk_buff *skb) if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) drop_reason = SKB_DROP_REASON_XFRM_POLICY; else - drop_reason = tcp_inbound_md5_hash(sk, skb, - &iph->saddr, &iph->daddr, - AF_INET, dif, sdif); + drop_reason = tcp_inbound_hash(sk, req, skb, + &iph->saddr, &iph->daddr, + AF_INET, dif, sdif); if (unlikely(drop_reason)) { sk_drops_add(sk, skb); reqsk_put(req); @@ -2297,8 +2297,8 @@ int tcp_v4_rcv(struct sk_buff *skb) goto discard_and_relse; } - drop_reason = tcp_inbound_md5_hash(sk, skb, &iph->saddr, - &iph->daddr, AF_INET, dif, sdif); + drop_reason = tcp_inbound_hash(sk, NULL, skb, &iph->saddr, &iph->daddr, + AF_INET, dif, sdif); if (drop_reason) goto discard_and_relse; diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c index bc032e441ef8..32e19b2dbda8 100644 --- a/net/ipv6/tcp_ao.c +++ b/net/ipv6/tcp_ao.c @@ -39,6 +39,18 @@ static int tcp_v6_ao_calc_key(struct tcp_ao_key *mkt, u8 *key, return tcp_ao_calc_traffic_key(mkt, key, &tmp, sizeof(tmp)); } +int tcp_v6_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key, + const struct sk_buff *skb, + __be32 sisn, __be32 disn) +{ + const struct ipv6hdr *iph = ipv6_hdr(skb); + const struct tcphdr *th = tcp_hdr(skb); + + return tcp_v6_ao_calc_key(mkt, key, &iph->saddr, + &iph->daddr, th->source, + th->dest, sisn, disn); +} + int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, const struct sock *sk, __be32 sisn, __be32 disn, bool send) @@ -52,6 +64,7 @@ int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, &sk->sk_v6_rcv_saddr, sk->sk_dport, htons(sk->sk_num), disn, sisn); } +EXPORT_SYMBOL_GPL(tcp_v6_ao_calc_key_sk); int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, struct request_sock *req) diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index b2f17d6ec5c3..d30c21440501 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1824,9 +1824,9 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb) struct sock *nsk; sk = req->rsk_listener; - drop_reason = tcp_inbound_md5_hash(sk, skb, - &hdr->saddr, &hdr->daddr, - AF_INET6, dif, sdif); + drop_reason = tcp_inbound_hash(sk, req, skb, + &hdr->saddr, &hdr->daddr, + AF_INET6, dif, sdif); if (drop_reason) { sk_drops_add(sk, skb); reqsk_put(req); @@ -1899,8 +1899,8 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb) goto discard_and_relse; } - drop_reason = tcp_inbound_md5_hash(sk, skb, &hdr->saddr, &hdr->daddr, - AF_INET6, dif, sdif); + drop_reason = tcp_inbound_hash(sk, NULL, skb, &hdr->saddr, &hdr->daddr, + AF_INET6, dif, sdif); if (drop_reason) goto discard_and_relse; @@ -2128,6 +2128,7 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { .ao_lookup = tcp_v6_ao_lookup, .calc_ao_hash = tcp_v4_ao_hash_skb, .ao_parse = tcp_v6_parse_ao, + .ao_calc_key_sk = tcp_v4_ao_calc_key_sk, #endif }; #endif From patchwork Fri May 12 20:23:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239670 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9462A209A7 for ; Fri, 12 May 2023 20:23:41 +0000 (UTC) Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [IPv6:2a00:1450:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8F882133 for ; 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Fri, 12 May 2023 13:23:36 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 13/21] net/tcp: Add TCP-AO segments counters Date: Fri, 12 May 2023 21:23:03 +0100 Message-Id: <20230512202311.2845526-14-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Introduce segment counters that are useful for troubleshooting/debugging as well as for writing tests. Now there are global snmp counters as well as per-socket and per-key. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/dropreason-core.h | 15 +++++++++++---- include/net/tcp.h | 11 ++++++++--- include/net/tcp_ao.h | 10 ++++++++++ include/uapi/linux/snmp.h | 4 ++++ include/uapi/linux/tcp.h | 8 +++++++- net/ipv4/proc.c | 4 ++++ net/ipv4/tcp_ao.c | 33 +++++++++++++++++++++++++++++---- net/ipv4/tcp_ipv4.c | 2 +- net/ipv6/tcp_ipv6.c | 4 ++-- 9 files changed, 76 insertions(+), 15 deletions(-) diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h index 0ff272d3b680..44ac4ebd8513 100644 --- a/include/net/dropreason-core.h +++ b/include/net/dropreason-core.h @@ -165,17 +165,24 @@ enum skb_drop_reason { */ SKB_DROP_REASON_TCP_MD5FAILURE, /** - * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected + * @SKB_DROP_REASON_TCP_AONOTFOUND: no TCP-AO hash and one was expected, + * corresponding to LINUX_MIB_TCPAOREQUIRED */ SKB_DROP_REASON_TCP_AONOTFOUND, /** * @SKB_DROP_REASON_TCP_AOUNEXPECTED: TCP-AO hash is present and it - * was not expected. + * was not expected, corresponding to LINUX_MIB_TCPAOKEYNOTFOUND */ SKB_DROP_REASON_TCP_AOUNEXPECTED, - /** @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown */ + /** + * @SKB_DROP_REASON_TCP_AOKEYNOTFOUND: TCP-AO key is unknown, + * corresponding to LINUX_MIB_TCPAOKEYNOTFOUND + */ SKB_DROP_REASON_TCP_AOKEYNOTFOUND, - /** @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong */ + /** + * @SKB_DROP_REASON_TCP_AOFAILURE: TCP-AO hash is wrong, + * corresponding to LINUX_MIB_TCPAOBAD + */ SKB_DROP_REASON_TCP_AOFAILURE, /** * @SKB_DROP_REASON_SOCKET_BACKLOG: failed to add skb to socket backlog ( diff --git a/include/net/tcp.h b/include/net/tcp.h index 5fe1b91854aa..57c7658cf296 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2569,7 +2569,7 @@ static inline int tcp_parse_auth_options(const struct tcphdr *th, } static inline bool tcp_ao_required(struct sock *sk, const void *saddr, - int family) + int family, bool stat_inc) { #ifdef CONFIG_TCP_AO struct tcp_ao_info *ao_info; @@ -2581,8 +2581,13 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr, return false; ao_key = tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0); - if (ao_info->ao_required || ao_key) + if (ao_info->ao_required || ao_key) { + if (stat_inc) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOREQUIRED); + atomic64_inc(&ao_info->counters.ao_required); + } return true; + } #endif return false; } @@ -2620,7 +2625,7 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req, * the last key is impossible to remove, so there's * always at least one current_key. */ - if (tcp_ao_required(sk, saddr, family)) + if (tcp_ao_required(sk, saddr, family, true)) return SKB_DROP_REASON_TCP_AONOTFOUND; if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index fe2f4f62f917..bd67e3680a2b 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -20,6 +20,13 @@ struct tcp_ao_hdr { u8 rnext_keyid; }; +struct tcp_ao_counters { + atomic64_t pkt_good; + atomic64_t pkt_bad; + atomic64_t key_not_found; + atomic64_t ao_required; +}; + struct tcp_ao_key { struct hlist_node node; union tcp_ao_addr addr; @@ -35,6 +42,8 @@ struct tcp_ao_key { u8 maclen; u8 digest_size; struct rcu_head rcu; + atomic64_t pkt_good; + atomic64_t pkt_bad; u8 traffic_keys[]; }; @@ -83,6 +92,7 @@ struct tcp_ao_info { */ struct tcp_ao_key *current_key; struct tcp_ao_key *rnext_key; + struct tcp_ao_counters counters; u32 ao_required :1, __unused :31; __be32 lisn; diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h index 26f33a4c253d..06ddf4cd295c 100644 --- a/include/uapi/linux/snmp.h +++ b/include/uapi/linux/snmp.h @@ -296,6 +296,10 @@ enum LINUX_MIB_TCPMIGRATEREQSUCCESS, /* TCPMigrateReqSuccess */ LINUX_MIB_TCPMIGRATEREQFAILURE, /* TCPMigrateReqFailure */ LINUX_MIB_TCPPLBREHASH, /* TCPPLBRehash */ + LINUX_MIB_TCPAOREQUIRED, /* TCPAORequired */ + LINUX_MIB_TCPAOBAD, /* TCPAOBad */ + LINUX_MIB_TCPAOKEYNOTFOUND, /* TCPAOKeyNotFound */ + LINUX_MIB_TCPAOGOOD, /* TCPAOGood */ __LINUX_MIB_MAX }; diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 250e0ce2cc38..3fe0612ec59a 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -391,9 +391,15 @@ struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO) */ __u32 set_current :1, /* corresponding ::current_key */ set_rnext :1, /* corresponding ::rnext */ ao_required :1, /* don't accept non-AO connects */ - reserved :29; /* must be 0 */ + set_counters :1, /* set/clear ::pkt_* counters */ + reserved :28; /* must be 0 */ + __u16 reserved2; /* padding, must be 0 */ __u8 current_key; /* KeyID to set as Current_key */ __u8 rnext; /* KeyID to set as Rnext_key */ + __u64 pkt_good; /* verified segments */ + __u64 pkt_bad; /* failed verification */ + __u64 pkt_key_not_found; /* could not find a key to verify */ + __u64 pkt_ao_required; /* segments missing TCP-AO sign */ } __attribute__((aligned(8))); /* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */ diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index eaf1d3113b62..3f643cd29cfe 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -298,6 +298,10 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS), SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE), SNMP_MIB_ITEM("TCPPLBRehash", LINUX_MIB_TCPPLBREHASH), + SNMP_MIB_ITEM("TCPAORequired", LINUX_MIB_TCPAOREQUIRED), + SNMP_MIB_ITEM("TCPAOBad", LINUX_MIB_TCPAOBAD), + SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND), + SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD), SNMP_MIB_SENTINEL }; diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index d43eff59e82f..4ef0418b9f5a 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -194,6 +194,8 @@ static struct tcp_ao_key *tcp_ao_copy_key(struct sock *sk, *new_key = *key; INIT_HLIST_NODE(&new_key->node); tcp_sigpool_get(new_key->tcp_sigpool_id); + atomic64_set(&new_key->pkt_good, 0); + atomic64_set(&new_key->pkt_bad, 0); return new_key; } @@ -665,14 +667,25 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, u8 maclen = aoh->length - sizeof(struct tcp_ao_hdr); const struct tcphdr *th = tcp_hdr(skb); - if (maclen != tcp_ao_maclen(key)) + if (maclen != tcp_ao_maclen(key)) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD); + atomic64_inc(&info->counters.pkt_bad); + atomic64_inc(&key->pkt_bad); return SKB_DROP_REASON_TCP_AOFAILURE; + } /* XXX: make it per-AF callback? */ tcp_ao_hash_skb(family, newhash, key, sk, skb, traffic_key, (phash - (u8 *)th), sne); - if (memcmp(phash, newhash, maclen)) + if (memcmp(phash, newhash, maclen)) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD); + atomic64_inc(&info->counters.pkt_bad); + atomic64_inc(&key->pkt_bad); return SKB_DROP_REASON_TCP_AOFAILURE; + } + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOGOOD); + atomic64_inc(&info->counters.pkt_good); + atomic64_inc(&key->pkt_good); return SKB_NOT_DROPPED_YET; } @@ -691,8 +704,10 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, u32 sne = 0; info = rcu_dereference(tcp_sk(sk)->ao_info); - if (!info) + if (!info) { + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND); return SKB_DROP_REASON_TCP_AOUNEXPECTED; + } if (unlikely(th->syn)) { sisn = th->seq; @@ -787,6 +802,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, traffic_key, phash, sne); key_not_found: + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND); + atomic64_inc(&info->counters.key_not_found); return SKB_DROP_REASON_TCP_AOKEYNOTFOUND; } EXPORT_SYMBOL_GPL(tcp_inbound_ao_hash); @@ -1342,6 +1359,8 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, key->keyflags = cmd.keyflags; key->sndid = cmd.sndid; key->rcvid = cmd.rcvid; + atomic64_set(&key->pkt_good, 0); + atomic64_set(&key->pkt_bad, 0); ret = tcp_ao_parse_crypto(&cmd, key); if (ret < 0) @@ -1553,7 +1572,7 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, return -EINVAL; } - if (cmd.reserved != 0) + if (cmd.reserved != 0 || cmd.reserved2 != 0) return -EINVAL; ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, @@ -1587,6 +1606,12 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, goto out; } } + if (cmd.set_counters) { + atomic64_set(&ao_info->counters.pkt_good, cmd.pkt_good); + atomic64_set(&ao_info->counters.pkt_bad, cmd.pkt_bad); + atomic64_set(&ao_info->counters.key_not_found, cmd.pkt_key_not_found); + atomic64_set(&ao_info->counters.ao_required, cmd.pkt_ao_required); + } ao_info->ao_required = cmd.ao_required; if (new_current) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index ab8152c51a62..9db6d7118c28 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1546,7 +1546,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, /* Don't allow keys for peers that have a matching TCP-AO key. * See the comment in tcp_ao_add_cmd() */ - if (tcp_ao_required(sk, addr, AF_INET)) + if (tcp_ao_required(sk, addr, AF_INET, false)) return -EKEYREJECTED; return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags, diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index d30c21440501..6918076e1552 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -664,7 +664,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, /* Don't allow keys for peers that have a matching TCP-AO key. * See the comment in tcp_ao_add_cmd() */ - if (tcp_ao_required(sk, addr, AF_INET)) + if (tcp_ao_required(sk, addr, AF_INET, false)) return -EKEYREJECTED; return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags, @@ -676,7 +676,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, /* Don't allow keys for peers that have a matching TCP-AO key. * See the comment in tcp_ao_add_cmd() */ - if (tcp_ao_required(sk, addr, AF_INET6)) + if (tcp_ao_required(sk, addr, AF_INET6, false)) return -EKEYREJECTED; return tcp_md5_do_add(sk, addr, AF_INET6, prefixlen, l3index, flags, From patchwork Fri May 12 20:23:04 2023 Content-Type: text/plain; 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Fri, 12 May 2023 13:23:38 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:38 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 14/21] net/tcp: Add TCP-AO SNE support Date: Fri, 12 May 2023 21:23:04 +0100 Message-Id: <20230512202311.2845526-15-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Add Sequence Number Extension (SNE) extension for TCP-AO. This is needed to protect long-living TCP-AO connections from replaying attacks after sequence number roll-over, see RFC5925 (6.2). Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- net/ipv4/tcp_input.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 959e4bdf2906..d87c73346e8c 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3528,9 +3528,21 @@ static inline bool tcp_may_update_window(const struct tcp_sock *tp, static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) { u32 delta = ack - tp->snd_una; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; +#endif sock_owned_by_me((struct sock *)tp); tp->bytes_acked += delta; +#ifdef CONFIG_TCP_AO + ao = rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held((struct sock *)tp)); + if (ao) { + if (ack < ao->snd_sne_seq) + ao->snd_sne++; + ao->snd_sne_seq = ack; + } +#endif tp->snd_una = ack; } @@ -3538,9 +3550,21 @@ static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq) { u32 delta = seq - tp->rcv_nxt; +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; +#endif sock_owned_by_me((struct sock *)tp); tp->bytes_received += delta; +#ifdef CONFIG_TCP_AO + ao = rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held((struct sock *)tp)); + if (ao) { + if (seq < ao->rcv_sne_seq) + ao->rcv_sne++; + ao->rcv_sne_seq = seq; + } +#endif WRITE_ONCE(tp->rcv_nxt, seq); } @@ -6371,6 +6395,17 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb, * simultaneous connect with crossed SYNs. * Particularly, it can be connect to self. */ +#ifdef CONFIG_TCP_AO + struct tcp_ao_info *ao; + + ao = rcu_dereference_protected(tp->ao_info, + lockdep_sock_is_held(sk)); + if (ao) { + ao->risn = th->seq; + ao->rcv_sne = 0; + ao->rcv_sne_seq = ntohl(th->seq); + } +#endif tcp_set_state(sk, TCP_SYN_RECV); if (tp->rx_opt.saw_tstamp) { From patchwork Fri May 12 20:23:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239672 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 891A3209AC for ; Fri, 12 May 2023 20:23:42 +0000 (UTC) Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82B0B4ED6 for ; Fri, 12 May 2023 13:23:40 -0700 (PDT) Received: by mail-wm1-x332.google.com with SMTP id 5b1f17b1804b1-3f427118644so62142345e9.0 for ; Fri, 12 May 2023 13:23:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923020; x=1686515020; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Z4qr5vCw/0NOEaSHOwxwN07T1+ESdNZE5gRM4K/uHIo=; b=Ok/UFNe9C/qGFROhNKzTfjNyJh4MGaqF2E19rZI7wo4PUsg29CHuKs7mvaq0szwZ+c Pq7c3WgAX7fBjJBEygNZvJU2Z+B/NgPlM0CVv5+sONuH5EyubKcfnK1R41P3PipM9ApE bCAu164xtg8Lej8L/MoyNtDhbzu9sipdKqqI62nwk0Zgfm54ts63R8uhVo4tkH2QJ9Zb lUNYstBb4ZuZqHn+O28C0DisqdYrFv9d8/VCe7JTKZzw0ZaqV3ZzbS8vQvVJFx6xxfy0 StqStX3/wlAoumyKkbdyoMBpVKHx+KHqhsZnrfaeJduiarK08zQVpBLfMHt3Kjsruxhe 7F/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923020; x=1686515020; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Z4qr5vCw/0NOEaSHOwxwN07T1+ESdNZE5gRM4K/uHIo=; b=Bg/2M0+EBcEx7q9gwVzXFP4loDFKTVQR6osIuFcxkinCuFarKl2+k12QRt4MGvPzr6 WZ79mNVNd2wNz5QrsEhAyyl3jMV27rbtf79i+OC5I8sQhFXyoeJKEnwYa7p77PKfEDxu /mEWU5OWWkshuGiFVjz3fvSIRhTUY49LA0r+tAn8V3pbTHW9dv42xqPxQINU8WSe30d+ TJ/dkATxICFFy6jXZ04Pn73pHZDOpblC+WlO3KcIaZ24XUPVF28MhtdumXeEjHMOkxWi cxZ75/Y42epF1lYAHH0ZqL9eBJt/dV9rikeedg8IO7rSrazEWOBrAx9Sl4AC/k99D3Sy We+g== X-Gm-Message-State: AC+VfDy7cnuI64lOiNofrIvvscggkuhMkyVnELks4JnqS6o1NjnTNwYZ AKfdUuG//GaW3W9z5mFLm9luLg== X-Google-Smtp-Source: ACHHUZ74q8BxnO1TXR22tQxK7owikieCDorl7mzGFLwSnK11dpHI7P2ZY/Ne4jrwZJkjMdWQ+fCN1A== X-Received: by 2002:a1c:6a18:0:b0:3f4:294d:8529 with SMTP id f24-20020a1c6a18000000b003f4294d8529mr12499190wmc.19.1683923020032; Fri, 12 May 2023 13:23:40 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:39 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 15/21] net/tcp: Add tcp_hash_fail() ratelimited logs Date: Fri, 12 May 2023 21:23:05 +0100 Message-Id: <20230512202311.2845526-16-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Add a helper for logging connection-detailed messages for failed TCP hash verification (both MD5 and AO). Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 17 ++++++++++++++--- include/net/tcp_ao.h | 29 +++++++++++++++++++++++++++++ net/ipv4/tcp.c | 23 +++++++++++++---------- net/ipv4/tcp_ao.c | 7 +++++++ 4 files changed, 63 insertions(+), 13 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 57c7658cf296..e7b077805d9e 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2605,12 +2605,19 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req, int l3index; /* Invalid option or two times meet any of auth options */ - if (tcp_parse_auth_options(th, &md5_location, &aoh)) + if (tcp_parse_auth_options(th, &md5_location, &aoh)) { + tcp_hash_fail("TCP segment has incorrect auth options set", + family, skb, ""); return SKB_DROP_REASON_TCP_AUTH_HDR; + } if (req) { - if (tcp_rsk_used_ao(req) != !!aoh) + if (tcp_rsk_used_ao(req) != !!aoh) { + tcp_hash_fail("TCP connection can't start/end using TCP-AO", + family, skb, "%s", + !aoh ? "missing AO" : "AO signed"); return SKB_DROP_REASON_TCP_AOFAILURE; + } } /* sdif set, means packet ingressed via a device @@ -2625,10 +2632,14 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req, * the last key is impossible to remove, so there's * always at least one current_key. */ - if (tcp_ao_required(sk, saddr, family, true)) + if (tcp_ao_required(sk, saddr, family, true)) { + tcp_hash_fail("AO hash is required, but not found", + family, skb, "L3 index %d", l3index); return SKB_DROP_REASON_TCP_AONOTFOUND; + } if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); + tcp_hash_fail("MD5 Hash not found", family, skb, ""); return SKB_DROP_REASON_TCP_MD5NOTFOUND; } return SKB_NOT_DROPPED_YET; diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index bd67e3680a2b..391b8260c325 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -105,6 +105,35 @@ struct tcp_ao_info { struct rcu_head rcu; }; +#define tcp_hash_fail(msg, family, skb, fmt, ...) \ +do { \ + const struct tcphdr *th = tcp_hdr(skb); \ + char hdr_flags[5] = {}; \ + char *f = hdr_flags; \ + \ + if (th->fin) \ + *f++ = 'F'; \ + if (th->syn) \ + *f++ = 'S'; \ + if (th->rst) \ + *f++ = 'R'; \ + if (th->ack) \ + *f++ = 'A'; \ + if (f != hdr_flags) \ + *f = ' '; \ + if (family == AF_INET) { \ + net_info_ratelimited("%s for (%pI4, %d)->(%pI4, %d) %s" fmt "\n", \ + msg, &ip_hdr(skb)->saddr, ntohs(th->source), \ + &ip_hdr(skb)->daddr, ntohs(th->dest), \ + hdr_flags, ##__VA_ARGS__); \ + } else { \ + net_info_ratelimited("%s for [%pI6c]:%u->[%pI6c]:%u %s" fmt "\n", \ + msg, &ipv6_hdr(skb)->saddr, ntohs(th->source), \ + &ipv6_hdr(skb)->daddr, ntohs(th->dest), \ + hdr_flags, ##__VA_ARGS__); \ + } \ +} while (0) + #ifdef CONFIG_TCP_AO /* TCP-AO structures and functions */ diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index e8c62fbc7ab7..77956937ada8 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4487,7 +4487,6 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, * o MD5 hash and we're not expecting one. * o MD5 hash and its wrong. */ - const struct tcphdr *th = tcp_hdr(skb); const struct tcp_sock *tp = tcp_sk(sk); struct tcp_md5sig_key *key; int genhash; @@ -4497,6 +4496,7 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, if (!key && hash_location) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); + tcp_hash_fail("Unexpected MD5 Hash found", family, skb, ""); return SKB_DROP_REASON_TCP_MD5UNEXPECTED; } @@ -4512,16 +4512,19 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, if (genhash || memcmp(hash_location, newhash, 16) != 0) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); if (family == AF_INET) { - net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n", - saddr, ntohs(th->source), - daddr, ntohs(th->dest), - genhash ? " tcp_v4_calc_md5_hash failed" - : "", l3index); + tcp_hash_fail("MD5 Hash failed", AF_INET, skb, "%s L3 index %d", + genhash ? "tcp_v4_calc_md5_hash failed" + : "", l3index); } else { - net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u L3 index %d\n", - genhash ? "failed" : "mismatch", - saddr, ntohs(th->source), - daddr, ntohs(th->dest), l3index); + if (genhash) { + tcp_hash_fail("MD5 Hash failed", + AF_INET6, skb, "L3 index %d", + l3index); + } else { + tcp_hash_fail("MD5 Hash mismatch", + AF_INET6, skb, "L3 index %d", + l3index); + } } return SKB_DROP_REASON_TCP_MD5FAILURE; } diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 4ef0418b9f5a..2f030cd5e605 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -671,6 +671,8 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD); atomic64_inc(&info->counters.pkt_bad); atomic64_inc(&key->pkt_bad); + tcp_hash_fail("AO hash wrong length", family, skb, + "%u != %d", maclen, tcp_ao_maclen(key)); return SKB_DROP_REASON_TCP_AOFAILURE; } @@ -681,6 +683,7 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD); atomic64_inc(&info->counters.pkt_bad); atomic64_inc(&key->pkt_bad); + tcp_hash_fail("AO hash mismatch", family, skb, ""); return SKB_DROP_REASON_TCP_AOFAILURE; } NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOGOOD); @@ -706,6 +709,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, info = rcu_dereference(tcp_sk(sk)->ao_info); if (!info) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND); + tcp_hash_fail("AO key not found", family, skb, + "keyid: %u", aoh->keyid); return SKB_DROP_REASON_TCP_AOUNEXPECTED; } @@ -804,6 +809,8 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, key_not_found: NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND); atomic64_inc(&info->counters.key_not_found); + tcp_hash_fail("Requested by the peer AO key id not found", + family, skb, ""); return SKB_DROP_REASON_TCP_AOKEYNOTFOUND; } EXPORT_SYMBOL_GPL(tcp_inbound_ao_hash); From patchwork Fri May 12 20:23:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239673 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86B6E23D5A for ; Fri, 12 May 2023 20:23:45 +0000 (UTC) Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [IPv6:2a00:1450:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 648825BA9 for ; Fri, 12 May 2023 13:23:43 -0700 (PDT) Received: by mail-wm1-x32c.google.com with SMTP id 5b1f17b1804b1-3f4ad71b00eso23908065e9.2 for ; Fri, 12 May 2023 13:23:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923021; x=1686515021; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=fWvsRLIxiB43sDAy6eApAN4jRtdnfyX6t8wa5LgFN8k=; b=bS2O09FjqLBfPvjsX9HIJIdTHqmnZsh49elIai1krm7urEk1pwni2SjcJQLp4oy7pf KE+ZjyXq7VnvuJ6Y/sCn/l2F/hnrdBUV3VOF4mN0SFRUgTIhc2X39MyuoWNBIkYVbQz6 BTRatEULipe55eKe1UAsstSGlSHPC9R6TlmEifqCK2gGVh+yKxpmNtMKhkhCIFpMZ2i7 snvxCkOTlpXWD2PKwVd5YC2Von0mqoK6tWuW6Wah7BLU/9K9aiq72Hn2ZAyZ7P/Lhb1S 3KrkXyfrL6DeCnqv8Va4w3ajkgoyt8ffhqC/6lkbHF+IRNXY+/ALT28+azRTwrJqY8BE jHOg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923021; x=1686515021; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=fWvsRLIxiB43sDAy6eApAN4jRtdnfyX6t8wa5LgFN8k=; b=ik5h5dpsUhstHDEAa3nRsAzBK9J0XQl9y5RvW/ydCgY3iHoHP/MeTZUgyJg/jbPlQE NS9B0bD8XEksMcQ0ykMSMfu6eOyNulfmrCBWlGhc/Drp44eDg5SRknSv/VHh3wGJp27r kagKHVbEd0VeELcP4Incogzt8FFHsUSXigM36qhw2vLT6sqLidAyC1V55Noekt3ZOoXq ojIWskotJ8CXajUhmxrHgiGSE52jxz/LghEGb8ebf/7B38MHOdHBe5GQfZAIJkSbRnwZ yxj0Dp7toPpMNd4/fUB4eTzncBX/3TpS8N5hbBYXFsLR5VSRA9pobCMx3REydYpG01Nw 0EGw== X-Gm-Message-State: AC+VfDxGd1uBLIZv8Je8nLinvcEvo7S71ldeS9hQmxkmCe1rbqsUQi9c llO9IGjEeWR+CW/t5eCHWRwD6A== X-Google-Smtp-Source: ACHHUZ6i3cfU7GyOiDffCCXIEwgFS2k5l021Y+jiELGkleBnZPbH3tSxYbo8r7cMrmPHpSej++W3QA== X-Received: by 2002:a7b:ca43:0:b0:3f1:72dc:8bae with SMTP id m3-20020a7bca43000000b003f172dc8baemr17142995wml.21.1683923021379; Fri, 12 May 2023 13:23:41 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:41 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 16/21] net/tcp: Ignore specific ICMPs for TCP-AO connections Date: Fri, 12 May 2023 21:23:06 +0100 Message-Id: <20230512202311.2845526-17-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Similarly to IPsec, RFC5925 prescribes: ">> A TCP-AO implementation MUST default to ignore incoming ICMPv4 messages of Type 3 (destination unreachable), Codes 2-4 (protocol unreachable, port unreachable, and fragmentation needed -- ’hard errors’), and ICMPv6 Type 1 (destination unreachable), Code 1 (administratively prohibited) and Code 4 (port unreachable) intended for connections in synchronized states (ESTABLISHED, FIN-WAIT-1, FIN- WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT) that match MKTs." A selftest (later in patch series) verifies that this attack is not possible in this TCP-AO implementation. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp_ao.h | 10 ++++++- include/uapi/linux/snmp.h | 1 + include/uapi/linux/tcp.h | 4 ++- net/ipv4/proc.c | 1 + net/ipv4/tcp_ao.c | 62 +++++++++++++++++++++++++++++++++++++++ net/ipv4/tcp_ipv4.c | 5 ++++ net/ipv6/tcp_ipv6.c | 4 +++ 7 files changed, 85 insertions(+), 2 deletions(-) diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index 391b8260c325..a99521b78147 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -25,6 +25,7 @@ struct tcp_ao_counters { atomic64_t pkt_bad; atomic64_t key_not_found; atomic64_t ao_required; + atomic64_t dropped_icmp; }; struct tcp_ao_key { @@ -94,7 +95,8 @@ struct tcp_ao_info { struct tcp_ao_key *rnext_key; struct tcp_ao_counters counters; u32 ao_required :1, - __unused :31; + accept_icmps :1, + __unused :30; __be32 lisn; __be32 risn; u32 snd_sne; @@ -174,6 +176,7 @@ int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, void tcp_ao_destroy_sock(struct sock *sk, bool twsk); u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq); void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp); +bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code); enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, unsigned short int family, const struct request_sock *req, @@ -248,6 +251,11 @@ static inline void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, { } +static inline bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code) +{ + return false; +} + static inline enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, unsigned short int family, const struct request_sock *req, const struct tcp_ao_hdr *aoh) diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h index 06ddf4cd295c..47a6b47da66f 100644 --- a/include/uapi/linux/snmp.h +++ b/include/uapi/linux/snmp.h @@ -300,6 +300,7 @@ enum LINUX_MIB_TCPAOBAD, /* TCPAOBad */ LINUX_MIB_TCPAOKEYNOTFOUND, /* TCPAOKeyNotFound */ LINUX_MIB_TCPAOGOOD, /* TCPAOGood */ + LINUX_MIB_TCPAODROPPEDICMPS, /* TCPAODroppedIcmps */ __LINUX_MIB_MAX }; diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 3fe0612ec59a..ca7ed18ce67b 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -392,7 +392,8 @@ struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO) */ set_rnext :1, /* corresponding ::rnext */ ao_required :1, /* don't accept non-AO connects */ set_counters :1, /* set/clear ::pkt_* counters */ - reserved :28; /* must be 0 */ + accept_icmps :1, /* accept incoming ICMPs */ + reserved :27; /* must be 0 */ __u16 reserved2; /* padding, must be 0 */ __u8 current_key; /* KeyID to set as Current_key */ __u8 rnext; /* KeyID to set as Rnext_key */ @@ -400,6 +401,7 @@ struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO) */ __u64 pkt_bad; /* failed verification */ __u64 pkt_key_not_found; /* could not find a key to verify */ __u64 pkt_ao_required; /* segments missing TCP-AO sign */ + __u64 pkt_dropped_icmp; /* ICMPs that were ignored */ } __attribute__((aligned(8))); /* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */ diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 3f643cd29cfe..5d3c9c96773e 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -302,6 +302,7 @@ static const struct snmp_mib snmp4_net_list[] = { SNMP_MIB_ITEM("TCPAOBad", LINUX_MIB_TCPAOBAD), SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND), SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD), + SNMP_MIB_ITEM("TCPAODroppedIcmps", LINUX_MIB_TCPAODROPPEDICMPS), SNMP_MIB_SENTINEL }; diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 2f030cd5e605..fdba3e1c80cc 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -15,6 +15,7 @@ #include #include +#include int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, unsigned int len) @@ -52,6 +53,64 @@ int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, return 1; } +bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code) +{ + struct tcp_ao_info *ao; + bool ignore_icmp = false; + + /* RFC5925, 7.8: + * >> A TCP-AO implementation MUST default to ignore incoming ICMPv4 + * messages of Type 3 (destination unreachable), Codes 2-4 (protocol + * unreachable, port unreachable, and fragmentation needed -- ’hard + * errors’), and ICMPv6 Type 1 (destination unreachable), Code 1 + * (administratively prohibited) and Code 4 (port unreachable) intended + * for connections in synchronized states (ESTABLISHED, FIN-WAIT-1, FIN- + * WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT) that match MKTs. + */ + if (sk->sk_family == AF_INET) { + if (type != ICMP_DEST_UNREACH) + return false; + if (code < ICMP_PROT_UNREACH || code > ICMP_FRAG_NEEDED) + return false; + } else if (sk->sk_family == AF_INET6) { + if (type != ICMPV6_DEST_UNREACH) + return false; + if (code != ICMPV6_ADM_PROHIBITED && code != ICMPV6_PORT_UNREACH) + return false; + } else { + WARN_ON_ONCE(1); + return false; + } + + rcu_read_lock(); + switch (sk->sk_state) { + case TCP_TIME_WAIT: + ao = rcu_dereference(tcp_twsk(sk)->ao_info); + break; + case TCP_SYN_SENT: + case TCP_SYN_RECV: + case TCP_LISTEN: + case TCP_NEW_SYN_RECV: + /* RFC5925 specifies to ignore ICMPs *only* on connections + * in synchronized states. + */ + rcu_read_unlock(); + return false; + default: + ao = rcu_dereference(tcp_sk(sk)->ao_info); + } + + if (ao && !ao->accept_icmps) { + ignore_icmp = true; + __NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAODROPPEDICMPS); + atomic64_inc(&ao->counters.dropped_icmp); + } + rcu_read_unlock(); + + return ignore_icmp; +} +EXPORT_SYMBOL_GPL(tcp_ao_ignore_icmp); + /* Optimized version of tcp_ao_do_lookup(): only for sockets for which * it's known that the keys in ao_info are matching peer's * family/address/port/VRF/etc. @@ -938,6 +997,7 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk, new_ao->lisn = htonl(tcp_rsk(req)->snt_isn); new_ao->risn = htonl(tcp_rsk(req)->rcv_isn); new_ao->ao_required = ao->ao_required; + new_ao->accept_icmps = ao->accept_icmps; if (family == AF_INET) { addr = (union tcp_ao_addr *)&newsk->sk_daddr; @@ -1618,9 +1678,11 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, atomic64_set(&ao_info->counters.pkt_bad, cmd.pkt_bad); atomic64_set(&ao_info->counters.key_not_found, cmd.pkt_key_not_found); atomic64_set(&ao_info->counters.ao_required, cmd.pkt_ao_required); + atomic64_set(&ao_info->counters.dropped_icmp, cmd.pkt_dropped_icmp); } ao_info->ao_required = cmd.ao_required; + ao_info->accept_icmps = cmd.accept_icmps; if (new_current) WRITE_ONCE(ao_info->current_key, new_current); if (new_rnext) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 9db6d7118c28..791453dabf88 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -492,6 +492,8 @@ int tcp_v4_err(struct sk_buff *skb, u32 info) return -ENOENT; } if (sk->sk_state == TCP_TIME_WAIT) { + /* To increase the counter of ignored icmps for TCP-AO */ + tcp_ao_ignore_icmp(sk, type, code); inet_twsk_put(inet_twsk(sk)); return 0; } @@ -506,6 +508,9 @@ int tcp_v4_err(struct sk_buff *skb, u32 info) } bh_lock_sock(sk); + if (tcp_ao_ignore_icmp(sk, type, code)) + goto out; + /* If too many ICMPs get dropped on busy * servers this needs to be solved differently. * We do take care of PMTU discovery (RFC1191) special case : diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 6918076e1552..3ed15011876b 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -399,6 +399,8 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, } if (sk->sk_state == TCP_TIME_WAIT) { + /* To increase the counter of ignored icmps for TCP-AO */ + tcp_ao_ignore_icmp(sk, type, code); inet_twsk_put(inet_twsk(sk)); return 0; } @@ -410,6 +412,8 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, } bh_lock_sock(sk); + if (tcp_ao_ignore_icmp(sk, type, code)) + goto out; if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); 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Fri, 12 May 2023 13:23:42 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:42 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 17/21] net/tcp: Add option for TCP-AO to (not) hash header Date: Fri, 12 May 2023 21:23:07 +0100 Message-Id: <20230512202311.2845526-18-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Provide setsockopt() key flag that makes TCP-AO exclude hashing TCP header for peers that match the key. This is needed for interraction with middleboxes that may change TCP options, see RFC5925 (9.2). Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/uapi/linux/tcp.h | 5 +++++ net/ipv4/tcp_ao.c | 8 +++++--- 2 files changed, 10 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index ca7ed18ce67b..3275ade3293a 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -354,6 +354,11 @@ struct tcp_diag_md5sig { #define TCP_AO_MAXKEYLEN 80 #define TCP_AO_KEYF_IFINDEX (1 << 0) /* L3 ifindex for VRF */ +#define TCP_AO_KEYF_EXCLUDE_OPT (1 << 1) /* "Indicates whether TCP + * options other than TCP-AO + * are included in the MAC + * calculation" + */ struct tcp_ao_add { /* setsockopt(TCP_AO_ADD_KEY) */ struct __kernel_sockaddr_storage addr; /* peer's address for the key */ diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index fdba3e1c80cc..890f48a97490 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -566,7 +566,8 @@ int tcp_ao_hash_hdr(unsigned short int family, char *ao_hash, WARN_ON_ONCE(1); goto clear_hash; } - if (tcp_ao_hash_header(&hp, th, false, + if (tcp_ao_hash_header(&hp, th, + !!(key->keyflags & TCP_AO_KEYF_EXCLUDE_OPT), ao_hash, hash_offset, tcp_ao_maclen(key))) goto clear_hash; ahash_request_set_crypt(hp.req, NULL, tmp_hash, 0); @@ -609,7 +610,8 @@ int tcp_ao_hash_skb(unsigned short int family, goto clear_hash; if (tcp_ao_hash_pseudoheader(family, sk, skb, &hp, skb->len)) goto clear_hash; - if (tcp_ao_hash_header(&hp, th, false, + if (tcp_ao_hash_header(&hp, th, + !!(key->keyflags & TCP_AO_KEYF_EXCLUDE_OPT), ao_hash, hash_offset, tcp_ao_maclen(key))) goto clear_hash; if (tcp_sigpool_hash_skb_data(&hp, skb, th->doff << 2)) @@ -1339,7 +1341,7 @@ static inline int tcp_ao_verify_ipv6(struct sock *sk, struct tcp_ao_add *cmd, } #endif -#define TCP_AO_KEYF_ALL (0) +#define TCP_AO_KEYF_ALL (TCP_AO_KEYF_EXCLUDE_OPT) static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, sockptr_t optval, int optlen) From patchwork Fri May 12 20:23:08 2023 Content-Type: text/plain; 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Fri, 12 May 2023 13:23:44 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:43 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 18/21] net/tcp: Add TCP-AO getsockopt()s Date: Fri, 12 May 2023 21:23:08 +0100 Message-Id: <20230512202311.2845526-19-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Introduce getsockopt(TCP_AO_GET_KEYS) that lets a user get TCP-AO keys and their properties from a socket. The user can provide a filter to match the specific key to be dumped or ::get_all = 1 may be used to dump all keys in one syscall. Add another getsockopt(TCP_AO_INFO) for providing per-socket/per-ao_info stats: packet counters, Current_key/RNext_key and flags like ::ao_required and ::accept_icmps. Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/net/tcp_ao.h | 12 ++ include/uapi/linux/tcp.h | 63 ++++++-- net/ipv4/tcp.c | 13 ++ net/ipv4/tcp_ao.c | 301 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 375 insertions(+), 14 deletions(-) diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index a99521b78147..d1dcda8f81be 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -177,6 +177,8 @@ void tcp_ao_destroy_sock(struct sock *sk, bool twsk); u32 tcp_ao_compute_sne(u32 sne, u32 seq, u32 new_seq); void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp); bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code); +int tcp_ao_get_mkts(struct sock *sk, sockptr_t optval, sockptr_t optlen); +int tcp_ao_get_sock_info(struct sock *sk, sockptr_t optval, sockptr_t optlen); enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, unsigned short int family, const struct request_sock *req, @@ -286,6 +288,16 @@ static inline void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, static inline void tcp_ao_connect_init(struct sock *sk) { } + +static int tcp_ao_get_mkts(struct sock *sk, sockptr_t optval, sockptr_t optlen) +{ + return -ENOPROTOOPT; +} + +static int tcp_ao_get_sock_info(struct sock *sk, sockptr_t optval, sockptr_t optlen) +{ + return -ENOPROTOOPT; +} #endif #if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO) diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 3275ade3293a..1109093bbb24 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -131,7 +131,8 @@ enum { #define TCP_AO_ADD_KEY 38 /* Add/Set MKT */ #define TCP_AO_DEL_KEY 39 /* Delete MKT */ -#define TCP_AO_INFO 40 /* Modify TCP-AO per-socket options */ +#define TCP_AO_INFO 40 /* Set/list TCP-AO per-socket options */ +#define TCP_AO_GET_KEYS 41 /* List MKT(s) */ #define TCP_REPAIR_ON 1 #define TCP_REPAIR_OFF 0 @@ -392,21 +393,55 @@ struct tcp_ao_del { /* setsockopt(TCP_AO_DEL_KEY) */ __u8 keyflags; /* see TCP_AO_KEYF_ */ } __attribute__((aligned(8))); -struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO) */ - __u32 set_current :1, /* corresponding ::current_key */ - set_rnext :1, /* corresponding ::rnext */ - ao_required :1, /* don't accept non-AO connects */ - set_counters :1, /* set/clear ::pkt_* counters */ - accept_icmps :1, /* accept incoming ICMPs */ +struct tcp_ao_info_opt { /* setsockopt(TCP_AO_INFO), getsockopt(TCP_AO_INFO) */ + /* Here 'in' is for setsockopt(), 'out' is for getsockopt() */ + __u32 set_current :1, /* in/out: corresponding ::current_key */ + set_rnext :1, /* in/out: corresponding ::rnext */ + ao_required :1, /* in/out: don't accept non-AO connects */ + set_counters :1, /* in: set/clear ::pkt_* counters */ + accept_icmps :1, /* in/out: accept incoming ICMPs */ reserved :27; /* must be 0 */ __u16 reserved2; /* padding, must be 0 */ - __u8 current_key; /* KeyID to set as Current_key */ - __u8 rnext; /* KeyID to set as Rnext_key */ - __u64 pkt_good; /* verified segments */ - __u64 pkt_bad; /* failed verification */ - __u64 pkt_key_not_found; /* could not find a key to verify */ - __u64 pkt_ao_required; /* segments missing TCP-AO sign */ - __u64 pkt_dropped_icmp; /* ICMPs that were ignored */ + __u8 current_key; /* in/out: KeyID of Current_key */ + __u8 rnext; /* in/out: keyid of RNext_key */ + __u64 pkt_good; /* in/out: verified segments */ + __u64 pkt_bad; /* in/out: failed verification */ + __u64 pkt_key_not_found; /* in/out: could not find a key to verify */ + __u64 pkt_ao_required; /* in/out: segments missing TCP-AO sign */ + __u64 pkt_dropped_icmp; /* in/out: ICMPs that were ignored */ +} __attribute__((aligned(8))); + +struct tcp_ao_getsockopt { /* getsockopt(TCP_AO_GET_KEYS) */ + struct __kernel_sockaddr_storage addr; /* in/out: dump keys for peer + * with this address/prefix + */ + char alg_name[64]; /* out: crypto hash algorithm */ + __u8 key[TCP_AO_MAXKEYLEN]; + __u32 nkeys; /* in: size of the userspace buffer + * @optval, measured in @optlen - the + * sizeof(struct tcp_ao_getsockopt) + * out: number of keys that matched + */ + __u16 is_current :1, /* in: match and dump Current_key, + * out: the dumped key is Current_key + */ + + is_rnext :1, /* in: match and dump RNext_key, + * out: the dumped key is RNext_key + */ + get_all :1, /* in: dump all keys */ + reserved :13; /* padding, must be 0 */ + __u8 sndid; /* in/out: dump keys with SendID */ + __u8 rcvid; /* in/out: dump keys with RecvID */ + __u8 prefix; /* in/out: dump keys with address/prefix */ + __u8 maclen; /* out: key's length of authentication + * code (hash) + */ + __u8 keyflags; /* in/out: see TCP_AO_KEYF_ */ + __u8 keylen; /* out: length of ::key */ + __s32 ifindex; /* in/out: L3 dev index for VRF */ + __u64 pkt_good; /* out: verified segments */ + __u64 pkt_bad; /* out: segments that failed verification */ } __attribute__((aligned(8))); /* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */ diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 77956937ada8..f613f011f2c8 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4396,6 +4396,19 @@ int do_tcp_getsockopt(struct sock *sk, int level, return err; } #endif + case TCP_AO_GET_KEYS: + case TCP_AO_INFO: { + int err; + + sockopt_lock_sock(sk); + if (optname == TCP_AO_GET_KEYS) + err = tcp_ao_get_mkts(sk, optval, optlen); + else + err = tcp_ao_get_sock_info(sk, optval, optlen); + sockopt_release_sock(sk); + + return err; + } default: return -ENOPROTOOPT; } diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 890f48a97490..b71f69afd409 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -1724,3 +1724,304 @@ int tcp_v4_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen) return tcp_parse_ao(sk, cmd, AF_INET, optval, optlen); } +/* tcp_ao_copy_mkts_to_user(ao_info, optval, optlen) + * + * @ao_info: struct tcp_ao_info on the socket that + * socket getsockopt(TCP_AO_GET_KEYS) is executed on + * @optval: pointer to array of tcp_ao_getsockopt structures in user space. + * Must be != NULL. + * @optlen: pointer to size of tcp_ao_getsockopt structure. + * Must be != NULL. + * + * Return value: 0 on success, a negative error number otherwise. + * + * optval points to an array of tcp_ao_getsockopt structures in user space. + * optval[0] is used as both input and output to getsockopt. It determines + * which keys are returned by the kernel. + * optval[0].nkeys is the size of the array in user space. On return it contains + * the number of keys matching the search criteria. + * If tcp_ao_getsockopt::get_all is set, then all keys in the socket are + * returned, otherwise only keys matching + * in optval[0] are returned. + * optlen is also used as both input and output. The user provides the size + * of struct tcp_ao_getsockopt in user space, and the kernel returns the size + * of the structure in kernel space. + * The size of struct tcp_ao_getsockopt may differ between user and kernel. + * There are three cases to consider: + * * If usize == ksize, then keys are copied verbatim. + * * If usize < ksize, then the userspace has passed an old struct to a + * newer kernel. The rest of the trailing bytes in optval[0] + * (ksize - usize) are interpreted as 0 by the kernel. + * * If usize > ksize, then the userspace has passed a new struct to an + * older kernel. The trailing bytes unknown to the kernel (usize - ksize) + * are checked to ensure they are zeroed, otherwise -E2BIG is returned. + * On return the kernel fills in min(usize, ksize) in each entry of the array. + * The layout of the fields in the user and kernel structures is expected to + * be the same (including in the 32bit vs 64bit case). + */ +static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info, + sockptr_t optval, sockptr_t optlen) +{ + struct tcp_ao_getsockopt opt_in, opt_out; + struct tcp_ao_key *key, *current_key; + bool do_address_matching = true; + union tcp_ao_addr *addr = NULL; + unsigned int max_keys; /* maximum number of keys to copy to user */ + size_t out_offset = 0; + size_t bytes_to_write; /* number of bytes to write to user level */ + int err, user_len; + u32 matched_keys; /* keys from ao_info matched so far */ + int optlen_out; + u16 port = 0; + + if (copy_from_sockptr(&user_len, optlen, sizeof(int))) + return -EFAULT; + + if (user_len <= 0) + return -EINVAL; + + memset(&opt_in, 0, sizeof(struct tcp_ao_getsockopt)); + err = copy_struct_from_sockptr(&opt_in, sizeof(opt_in), + optval, user_len); + if (err < 0) + return err; + + if (opt_in.pkt_good || opt_in.pkt_bad) + return -EINVAL; + + if (opt_in.reserved != 0) + return -EINVAL; + + max_keys = opt_in.nkeys; + + if (opt_in.get_all || opt_in.is_current || opt_in.is_rnext) { + if (opt_in.get_all && (opt_in.is_current || opt_in.is_rnext)) + return -EINVAL; + do_address_matching = false; + } + + switch (opt_in.addr.ss_family) { + case AF_INET: { + struct sockaddr_in *sin; + __be32 mask; + + sin = (struct sockaddr_in *)&opt_in.addr; + port = sin->sin_port; + addr = (union tcp_ao_addr *)&sin->sin_addr; + + if (opt_in.prefix > 32) + return -EINVAL; + + if (sin->sin_addr.s_addr == INADDR_ANY && + opt_in.prefix != 0) + return -EINVAL; + + mask = inet_make_mask(opt_in.prefix); + if (sin->sin_addr.s_addr & ~mask) + return -EINVAL; + + break; + } + case AF_INET6: { + struct sockaddr_in6 *sin6; + struct in6_addr *addr6; + + sin6 = (struct sockaddr_in6 *)&opt_in.addr; + addr = (union tcp_ao_addr *)&sin6->sin6_addr; + addr6 = &sin6->sin6_addr; + port = sin6->sin6_port; + + /* We don't have to change family and @addr here if + * ipv6_addr_v4mapped() like in key adding: + * tcp_ao_key_cmp() does it. Do the sanity checks though. + */ + if (opt_in.prefix != 0) { + if (ipv6_addr_v4mapped(addr6)) { + __be32 mask, addr4 = addr6->s6_addr32[3]; + + if (opt_in.prefix > 32 || + addr4 == INADDR_ANY) + return -EINVAL; + mask = inet_make_mask(opt_in.prefix); + if (addr4 & ~mask) + return -EINVAL; + } else { + struct in6_addr pfx; + + if (ipv6_addr_any(addr6) || + opt_in.prefix > 128) + return -EINVAL; + + ipv6_addr_prefix(&pfx, addr6, opt_in.prefix); + if (ipv6_addr_cmp(&pfx, addr6)) + return -EINVAL; + } + } else if (!ipv6_addr_any(addr6)) { + return -EINVAL; + } + break; + } + case 0: + if (!do_address_matching) + break; + fallthrough; + default: + return -EAFNOSUPPORT; + } + + if (!do_address_matching) { + /* We could just ignore those, but let's do stricter checks */ + if (addr || port) + return -EINVAL; + if (opt_in.prefix || opt_in.sndid || opt_in.rcvid) + return -EINVAL; + } + + bytes_to_write = min_t(int, user_len, sizeof(struct tcp_ao_getsockopt)); + matched_keys = 0; + /* May change in RX, while we're dumping, pre-fetch it */ + current_key = READ_ONCE(ao_info->current_key); + + hlist_for_each_entry_rcu(key, &ao_info->head, node) { + if (opt_in.get_all) + goto match; + + if (opt_in.is_current || opt_in.is_rnext) { + if (opt_in.is_current && key == current_key) + goto match; + if (opt_in.is_rnext && key == ao_info->rnext_key) + goto match; + continue; + } + + if (tcp_ao_key_cmp(key, addr, opt_in.prefix, + opt_in.addr.ss_family, + opt_in.sndid, opt_in.rcvid, port) != 0) + continue; +match: + matched_keys++; + if (matched_keys > max_keys) + continue; + + memset(&opt_out, 0, sizeof(struct tcp_ao_getsockopt)); + + if (key->family == AF_INET) { + struct sockaddr_in *sin_out = (struct sockaddr_in *)&opt_out.addr; + + sin_out->sin_family = key->family; + sin_out->sin_port = ntohs(key->port); + memcpy(&sin_out->sin_addr, &key->addr, sizeof(struct in_addr)); + } else { + struct sockaddr_in6 *sin6_out = (struct sockaddr_in6 *)&opt_out.addr; + + sin6_out->sin6_family = key->family; + sin6_out->sin6_port = ntohs(key->port); + memcpy(&sin6_out->sin6_addr, &key->addr, sizeof(struct in6_addr)); + } + opt_out.sndid = key->sndid; + opt_out.rcvid = key->rcvid; + opt_out.prefix = key->prefixlen; + opt_out.keyflags = key->keyflags; + opt_out.is_current = (key == current_key); + opt_out.is_rnext = (key == ao_info->rnext_key); + opt_out.nkeys = 0; + opt_out.maclen = key->maclen; + opt_out.keylen = key->keylen; + opt_out.pkt_good = atomic64_read(&key->pkt_good); + opt_out.pkt_bad = atomic64_read(&key->pkt_bad); + memcpy(&opt_out.key, key->key, key->keylen); + tcp_sigpool_algo(key->tcp_sigpool_id, opt_out.alg_name, 64); + + /* Copy key to user */ + if (copy_to_sockptr_offset(optval, out_offset, + &opt_out, bytes_to_write)) + return -EFAULT; + out_offset += user_len; + } + + optlen_out = (int)sizeof(struct tcp_ao_getsockopt); + if (copy_to_sockptr(optlen, &optlen_out, sizeof(int))) + return -EFAULT; + + out_offset = offsetof(struct tcp_ao_getsockopt, nkeys); + if (copy_to_sockptr_offset(optval, out_offset, + &matched_keys, sizeof(u32))) + return -EFAULT; + + return 0; +} + +int tcp_ao_get_mkts(struct sock *sk, sockptr_t optval, sockptr_t optlen) +{ + struct tcp_ao_info *ao_info; + u32 state; + + /* Check socket state */ + state = (1 << sk->sk_state) & + (TCPF_CLOSE | TCPF_ESTABLISHED | TCPF_LISTEN); + if (!state) + return -ESOCKTNOSUPPORT; + + /* Check ao_info */ + ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (!ao_info) + return -ENOENT; + + return tcp_ao_copy_mkts_to_user(ao_info, optval, optlen); +} + +int tcp_ao_get_sock_info(struct sock *sk, sockptr_t optval, sockptr_t optlen) +{ + struct tcp_ao_info_opt out, in = {}; + struct tcp_ao_key *current_key; + struct tcp_ao_info *ao; + int err, len; + + if (copy_from_sockptr(&len, optlen, sizeof(int))) + return -EFAULT; + + if (len <= 0) + return -EINVAL; + + /* Copying this "in" only to check ::reserved, ::reserved2, + * that may be needed to extend (struct tcp_ao_info_opt) and + * what getsockopt() provides in future. + */ + err = copy_struct_from_sockptr(&in, sizeof(in), optval, len); + if (err) + return err; + + if (in.reserved != 0 || in.reserved2 != 0) + return -EINVAL; + + ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, + lockdep_sock_is_held(sk)); + if (!ao) + return -ENOENT; + + memset(&out, 0, sizeof(out)); + out.ao_required = ao->ao_required; + out.accept_icmps = ao->accept_icmps; + out.pkt_good = atomic64_read(&ao->counters.pkt_good); + out.pkt_bad = atomic64_read(&ao->counters.pkt_bad); + out.pkt_key_not_found = atomic64_read(&ao->counters.key_not_found); + out.pkt_ao_required = atomic64_read(&ao->counters.ao_required); + out.pkt_dropped_icmp = atomic64_read(&ao->counters.dropped_icmp); + + current_key = READ_ONCE(ao->current_key); + if (current_key) { + out.set_current = 1; + out.current_key = current_key->sndid; + } + if (ao->rnext_key) { + out.set_rnext = 1; + out.rnext = ao->rnext_key->rcvid; + } + + if (copy_to_sockptr(optval, &out, min_t(int, len, sizeof(out)))) + return -EFAULT; + + return 0; +} + From patchwork Fri May 12 20:23:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239676 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 688222106C for ; 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Fri, 12 May 2023 13:23:45 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 19/21] net/tcp: Allow asynchronous delete for TCP-AO keys (MKTs) Date: Fri, 12 May 2023 21:23:09 +0100 Message-Id: <20230512202311.2845526-20-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Delete becomes very, very fast - almost free, but after setsockopt() syscall returns, the key is still alive until next RCU grace period. Which is fine for listen sockets as userspace needs to be aware of setsockopt(TCP_AO) and accept() race and resolve it with verification by getsockopt() after TCP connection was accepted. The benchmark results (on non-loaded box, worse with more RCU work pending): > ok 33 Worst case delete 16384 keys: min=5ms max=10ms mean=6.93904ms stddev=0.263421 > ok 34 Add a new key 16384 keys: min=1ms max=4ms mean=2.17751ms stddev=0.147564 > ok 35 Remove random-search 16384 keys: min=5ms max=10ms mean=6.50243ms stddev=0.254999 > ok 36 Remove async 16384 keys: min=0ms max=0ms mean=0.0296107ms stddev=0.0172078 Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov --- include/uapi/linux/tcp.h | 3 ++- net/ipv4/tcp_ao.c | 21 ++++++++++++++++++--- 2 files changed, 20 insertions(+), 4 deletions(-) diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 1109093bbb24..979ff960fddb 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -383,7 +383,8 @@ struct tcp_ao_del { /* setsockopt(TCP_AO_DEL_KEY) */ __s32 ifindex; /* L3 dev index for VRF */ __u32 set_current :1, /* corresponding ::current_key */ set_rnext :1, /* corresponding ::rnext */ - reserved :30; /* must be 0 */ + del_async :1, /* only valid for listen sockets */ + reserved :29; /* must be 0 */ __u16 reserved2; /* padding, must be 0 */ __u8 prefix; /* peer's address prefix */ __u8 sndid; /* SendID for outgoing segments */ diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index b71f69afd409..40b13fcb0723 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -1463,7 +1463,7 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, } static int tcp_ao_delete_key(struct sock *sk, struct tcp_ao_info *ao_info, - struct tcp_ao_key *key, + bool del_async, struct tcp_ao_key *key, struct tcp_ao_key *new_current, struct tcp_ao_key *new_rnext) { @@ -1471,11 +1471,24 @@ static int tcp_ao_delete_key(struct sock *sk, struct tcp_ao_info *ao_info, hlist_del_rcu(&key->node); + /* Support for async delete on listening sockets: as they don't + * need current_key/rnext_key maintaining, we don't need to check + * them and we can just free all resources in RCU fashion. + */ + if (del_async) { + atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc); + call_rcu(&key->rcu, tcp_ao_key_free_rcu); + return 0; + } + /* At this moment another CPU could have looked this key up * while it was unlinked from the list. Wait for RCU grace period, * after which the key is off-list and can't be looked up again; * the rx path [just before RCU came] might have used it and set it * as current_key (very unlikely). + * Free the key with next RCU grace period (in case it was + * current_key before tcp_ao_current_rnext() might have + * changed it in forced-delete). */ synchronize_rcu(); if (new_current) @@ -1545,6 +1558,8 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family, if (!new_rnext) return -ENOENT; } + if (cmd.del_async && sk->sk_state != TCP_LISTEN) + return -EINVAL; if (family == AF_INET) { struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.addr; @@ -1589,8 +1604,8 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family, if (key == new_current || key == new_rnext) continue; - return tcp_ao_delete_key(sk, ao_info, key, - new_current, new_rnext); + return tcp_ao_delete_key(sk, ao_info, cmd.del_async, key, + new_current, new_rnext); } return -ENOENT; } From patchwork Fri May 12 20:23:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239677 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6886B21088 for ; Fri, 12 May 2023 20:23:51 +0000 (UTC) Received: from mail-wm1-x335.google.com (mail-wm1-x335.google.com [IPv6:2a00:1450:4864:20::335]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C4DD6EBF for ; Fri, 12 May 2023 13:23:47 -0700 (PDT) Received: by mail-wm1-x335.google.com with SMTP id 5b1f17b1804b1-3f41dceb9d4so74866645e9.1 for ; Fri, 12 May 2023 13:23:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=google; t=1683923027; x=1686515027; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=x6Ihe7mNatsp+aOBLmS5S5MBjAGFIM7G6AEhsvQUkDE=; b=AT1PVRgDN9K3+i4NT5nQEEajvdd+yPqr86IJa8GRXRDhaPTGANL/7ShanTNEjHIzS1 EjLVHmIEzKV3nr6sPUFu+HTyLAkq0+PPeJGaHWd/yVqL6U+i5mCt3yUAxuKpaIrvKMWa Qs9bBUSMt0VTNk8eJ+xDd7/G2YIfCNz3z/5opMBGZLOFh0r4iPQRQNx7pVCiG7vdxU/Y 42aScuPnxUSSIDl0Z96MhfLyjUMGCRSlN0K+ADJzM/RJ2WWNUrIhOcogyZs3FOacritr +Uvnngi2URrrzMpIetNG7kZHeqwfjYCvnWuGIbAz7ALyfN9y+8ntuT2EcbklGNEcszMO 0TuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683923027; x=1686515027; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=x6Ihe7mNatsp+aOBLmS5S5MBjAGFIM7G6AEhsvQUkDE=; b=ljVy4aqvL1mod6GjM8oSMWtZpp/pWP97nClCD7IiPTHEsuBTv0K9K4aTdY35JeMw1S x8ium4NnczPVnK/QPIQmkLVs7A4TkRzfGSSJxs+NqmCQLKQXJWtuyPew9QetN+XN6pzP Qb2VnmBh85s7NCSzujzurk/B12xOYWCUpkKmtfZFqis2WHuSW2oRcAxieRyjabbFJaWN 9dR5+oJpVXfYfLZo018z+dTv5ojEwaNw8Ppqcjwyl+d/Sn7JDAe71RjGIxKh9eSgG9pP UIYTOJQEon0vNUdGC4kucP7onZuMhWcGAUIRYYzjazrJkNz/827UkIkXND42lW+yZBth D4Jg== X-Gm-Message-State: AC+VfDxrwnQPaC00cG7U/Y3Seu9Bx+X6cSEWkkMt2NkQnxkcaSOqjwBJ ecCNLsbtDXk3ShVKyISYLBvwEQ== X-Google-Smtp-Source: ACHHUZ4IHkh/4zIptqMNZ7cP5UukZG6d4pvIGvEIZbO4wZjRny0PgPxIKJeKC7pkfeGo+7IOPWJTzQ== X-Received: by 2002:a05:600c:24ce:b0:3f2:51e7:f1f4 with SMTP id 14-20020a05600c24ce00b003f251e7f1f4mr19182509wmu.10.1683923026931; Fri, 12 May 2023 13:23:46 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:46 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 20/21] net/tcp: Add static_key for TCP-AO Date: Fri, 12 May 2023 21:23:10 +0100 Message-Id: <20230512202311.2845526-21-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Similarly to TCP-MD5, add a static key to TCP-AO that is patched out when there are no keys on a machine and dynamically enabled with the first setsockopt(TCP_AO) adds a key on any socket. The static key is as well dynamically disabled later when the socket is destructed. The lifetime of enabled static key here is the same as ao_info: it is enabled on allocation, passed over from full socket to twsk and destructed when ao_info is scheduled for destruction. Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 3 +++ include/net/tcp_ao.h | 2 ++ net/ipv4/tcp_ao.c | 23 +++++++++++++++++++++++ net/ipv4/tcp_input.c | 42 ++++++++++++++++++++++++++++-------------- 4 files changed, 56 insertions(+), 14 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index e7b077805d9e..8eae8e82980f 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2575,6 +2575,9 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr, struct tcp_ao_info *ao_info; struct tcp_ao_key *ao_key; + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return false; + ao_info = rcu_dereference_check(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); if (!ao_info) diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index d1dcda8f81be..c19c9416ff6d 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -138,6 +138,8 @@ do { \ #ifdef CONFIG_TCP_AO /* TCP-AO structures and functions */ +#include +extern struct static_key_false_deferred tcp_ao_needed; struct tcp4_ao_context { __be32 saddr; diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 40b13fcb0723..3538321a742f 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -17,6 +17,9 @@ #include #include +DEFINE_STATIC_KEY_DEFERRED_FALSE(tcp_ao_needed, HZ); +EXPORT_SYMBOL_GPL(tcp_ao_needed); + int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, unsigned int len) { @@ -58,6 +61,9 @@ bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code) struct tcp_ao_info *ao; bool ignore_icmp = false; + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return false; + /* RFC5925, 7.8: * >> A TCP-AO implementation MUST default to ignore incoming ICMPv4 * messages of Type 3 (destination unreachable), Codes 2-4 (protocol @@ -198,6 +204,9 @@ static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk, struct tcp_ao_key *key; struct tcp_ao_info *ao; + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return NULL; + ao = rcu_dereference_check(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); if (!ao) @@ -292,6 +301,7 @@ void tcp_ao_destroy_sock(struct sock *sk, bool twsk) } kfree_rcu(ao, rcu); + static_branch_slow_dec_deferred(&tcp_ao_needed); } void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp) @@ -1037,6 +1047,11 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk, goto free_and_exit; } + if (!static_key_fast_inc_not_disabled(&tcp_ao_needed.key.key)) { + ret = -EUSERS; + goto free_and_exit; + } + key_head = rcu_dereference(hlist_first_rcu(&new_ao->head)); first_key = hlist_entry_safe(key_head, struct tcp_ao_key, node); @@ -1443,6 +1458,10 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, tcp_ao_link_mkt(ao_info, key); if (first) { + if (!static_branch_inc(&tcp_ao_needed.key)) { + ret = -EUSERS; + goto err_free_sock; + } sk_gso_disable(sk); rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info); } @@ -1705,6 +1724,10 @@ static int tcp_ao_info_cmd(struct sock *sk, unsigned short int family, if (new_rnext) WRITE_ONCE(ao_info->rnext_key, new_rnext); if (first) { + if (!static_branch_inc(&tcp_ao_needed.key)) { + err = -EUSERS; + goto out; + } sk_gso_disable(sk); rcu_assign_pointer(tcp_sk(sk)->ao_info, ao_info); } diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index d87c73346e8c..7f6f9b04e9e9 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -3524,17 +3524,14 @@ static inline bool tcp_may_update_window(const struct tcp_sock *tp, (ack_seq == tp->snd_wl1 && nwin > tp->snd_wnd); } -/* If we update tp->snd_una, also update tp->bytes_acked */ -static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) +static void tcp_snd_sne_update(struct tcp_sock *tp, u32 ack) { - u32 delta = ack - tp->snd_una; #ifdef CONFIG_TCP_AO struct tcp_ao_info *ao; -#endif - sock_owned_by_me((struct sock *)tp); - tp->bytes_acked += delta; -#ifdef CONFIG_TCP_AO + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return; + ao = rcu_dereference_protected(tp->ao_info, lockdep_sock_is_held((struct sock *)tp)); if (ao) { @@ -3543,20 +3540,27 @@ static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) ao->snd_sne_seq = ack; } #endif +} + +/* If we update tp->snd_una, also update tp->bytes_acked */ +static void tcp_snd_una_update(struct tcp_sock *tp, u32 ack) +{ + u32 delta = ack - tp->snd_una; + + sock_owned_by_me((struct sock *)tp); + tp->bytes_acked += delta; + tcp_snd_sne_update(tp, ack); tp->snd_una = ack; } -/* If we update tp->rcv_nxt, also update tp->bytes_received */ -static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq) +static void tcp_rcv_sne_update(struct tcp_sock *tp, u32 seq) { - u32 delta = seq - tp->rcv_nxt; #ifdef CONFIG_TCP_AO struct tcp_ao_info *ao; -#endif - sock_owned_by_me((struct sock *)tp); - tp->bytes_received += delta; -#ifdef CONFIG_TCP_AO + if (!static_branch_unlikely(&tcp_ao_needed.key)) + return; + ao = rcu_dereference_protected(tp->ao_info, lockdep_sock_is_held((struct sock *)tp)); if (ao) { @@ -3565,6 +3569,16 @@ static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq) ao->rcv_sne_seq = seq; } #endif +} + +/* If we update tp->rcv_nxt, also update tp->bytes_received */ +static void tcp_rcv_nxt_update(struct tcp_sock *tp, u32 seq) +{ + u32 delta = seq - tp->rcv_nxt; + + sock_owned_by_me((struct sock *)tp); + tp->bytes_received += delta; + tcp_rcv_sne_update(tp, seq); WRITE_ONCE(tp->rcv_nxt, seq); } From patchwork Fri May 12 20:23:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Safonov X-Patchwork-Id: 13239678 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 03FBD23D7B for ; Fri, 12 May 2023 20:23:58 +0000 (UTC) Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6BC761B7 for ; Fri, 12 May 2023 13:23:49 -0700 (PDT) Received: by mail-wm1-x333.google.com with SMTP id 5b1f17b1804b1-3f427118644so62143295e9.0 for ; Fri, 12 May 2023 13:23:49 -0700 (PDT) DKIM-Signature: v=1; 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Fri, 12 May 2023 13:23:48 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id n9-20020a05600c294900b003f423508c6bsm17304527wmd.44.2023.05.12.13.23.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 May 2023 13:23:47 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org, David Ahern , Eric Dumazet , Paolo Abeni , Jakub Kicinski , "David S. Miller" Cc: Dmitry Safonov , Andy Lutomirski , Ard Biesheuvel , Bob Gilligan , Dan Carpenter , David Laight , Dmitry Safonov <0x7f454c46@gmail.com>, Eric Biggers , "Eric W. Biederman" , Francesco Ruggeri , Herbert Xu , Hideaki YOSHIFUJI , Ivan Delalande , Leonard Crestez , Salam Noureddine , netdev@vger.kernel.org Subject: [PATCH v6 21/21] net/tcp: Wire up l3index to TCP-AO Date: Fri, 12 May 2023 21:23:11 +0100 Message-Id: <20230512202311.2845526-22-dima@arista.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230512202311.2845526-1-dima@arista.com> References: <20230512202311.2845526-1-dima@arista.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Similarly how TCP_MD5SIG_FLAG_IFINDEX works for TCP-MD5, TCP_AO_KEYF_IFINDEX is an AO-key flag that binds that MKT to a specified by L3 ifinndex. Similarly, without this flag the key will work in the default VRF l3index = 0 for connections. To prevent AO-keys from overlapping, it's restricted to add key B for a socket that has key A, which have the same sndid/rcvid and one of the following is true: - !(A.keyflags & TCP_AO_KEYF_IFINDEX) or !(B.keyflags & TCP_AO_KEYF_IFINDEX) so that any key is non-bound to a VRF - A.l3index == B.l3index both want to work for the same VRF Additionally, it's restricted to match TCP-MD5 keys for the same peer the following way: |--------------|--------------------|----------------|---------------| | | MD5 key without | MD5 key | MD5 key | | | l3index | l3index=0 | l3index=N | |--------------|--------------------|----------------|---------------| | TCP-AO key | | | | | without | reject | reject | reject | | l3index | | | | |--------------|--------------------|----------------|---------------| | TCP-AO key | | | | | l3index=0 | reject | reject | allow | |--------------|--------------------|----------------|---------------| | TCP-AO key | | | | | l3index=N | reject | allow | reject | |--------------|--------------------|----------------|---------------| This is done with the help of tcp_md5_do_lookup_any_l3index() to reject adding AO key without TCP_AO_KEYF_IFINDEX if there's TCP-MD5 in any VRF. This is important for case where sysctl_tcp_l3mdev_accept = 1 Similarly, for TCP-AO lookups tcp_ao_do_lookup() may be used with l3index < 0, so that __tcp_ao_key_cmp() will match TCP-AO key in any VRF. Signed-off-by: Dmitry Safonov --- include/net/tcp.h | 11 +-- include/net/tcp_ao.h | 17 +++-- net/ipv4/syncookies.c | 6 +- net/ipv4/tcp_ao.c | 164 +++++++++++++++++++++++++++++++----------- net/ipv4/tcp_ipv4.c | 13 ++-- net/ipv6/syncookies.c | 5 +- net/ipv6/tcp_ao.c | 20 +++--- net/ipv6/tcp_ipv6.c | 15 ++-- 8 files changed, 171 insertions(+), 80 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 8eae8e82980f..42d4bdf84641 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -2569,7 +2569,7 @@ static inline int tcp_parse_auth_options(const struct tcphdr *th, } static inline bool tcp_ao_required(struct sock *sk, const void *saddr, - int family, bool stat_inc) + int family, int l3index, bool stat_inc) { #ifdef CONFIG_TCP_AO struct tcp_ao_info *ao_info; @@ -2583,7 +2583,7 @@ static inline bool tcp_ao_required(struct sock *sk, const void *saddr, if (!ao_info) return false; - ao_key = tcp_ao_do_lookup(sk, saddr, family, -1, -1, 0); + ao_key = tcp_ao_do_lookup(sk, l3index, saddr, family, -1, -1, 0); if (ao_info->ao_required || ao_key) { if (stat_inc) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOREQUIRED); @@ -2635,21 +2635,22 @@ tcp_inbound_hash(struct sock *sk, const struct request_sock *req, * the last key is impossible to remove, so there's * always at least one current_key. */ - if (tcp_ao_required(sk, saddr, family, true)) { + if (tcp_ao_required(sk, saddr, family, l3index, true)) { tcp_hash_fail("AO hash is required, but not found", family, skb, "L3 index %d", l3index); return SKB_DROP_REASON_TCP_AONOTFOUND; } if (unlikely(tcp_md5_do_lookup(sk, l3index, saddr, family))) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); - tcp_hash_fail("MD5 Hash not found", family, skb, ""); + tcp_hash_fail("MD5 Hash not found", + family, skb, "L3 index %d", l3index); return SKB_DROP_REASON_TCP_MD5NOTFOUND; } return SKB_NOT_DROPPED_YET; } if (aoh) - return tcp_inbound_ao_hash(sk, skb, family, req, aoh); + return tcp_inbound_ao_hash(sk, skb, family, req, l3index, aoh); return tcp_inbound_md5_hash(sk, skb, saddr, daddr, family, l3index, md5_location); diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h index c19c9416ff6d..a6c84b11142c 100644 --- a/include/net/tcp_ao.h +++ b/include/net/tcp_ao.h @@ -33,6 +33,7 @@ struct tcp_ao_key { union tcp_ao_addr addr; u8 key[TCP_AO_MAXKEYLEN] __tcp_ao_key_align; unsigned int tcp_sigpool_id; + int l3index; u16 port; u8 prefixlen; u8 family; @@ -183,9 +184,9 @@ int tcp_ao_get_mkts(struct sock *sk, sockptr_t optval, sockptr_t optlen); int tcp_ao_get_sock_info(struct sock *sk, sockptr_t optval, sockptr_t optlen); enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, unsigned short int family, - const struct request_sock *req, + const struct request_sock *req, int l3index, const struct tcp_ao_hdr *aoh); -struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, +struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, int l3index, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port); int tcp_ao_hash_hdr(unsigned short family, char *ao_hash, @@ -225,9 +226,6 @@ int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, __be32 disn, bool send); int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, struct request_sock *req); -struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk, - const struct in6_addr *addr, - int sndid, int rcvid); struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid); @@ -246,12 +244,12 @@ void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb); void tcp_ao_connect_init(struct sock *sk); void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, struct tcp_request_sock *treq, - unsigned short int family); + unsigned short int family, int l3index); #else /* CONFIG_TCP_AO */ static inline void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, struct tcp_request_sock *treq, - unsigned short int family) + unsigned short int family, int l3index) { } @@ -262,13 +260,14 @@ static inline bool tcp_ao_ignore_icmp(struct sock *sk, int type, int code) static inline enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, unsigned short int family, - const struct request_sock *req, const struct tcp_ao_hdr *aoh) + const struct request_sock *req, int l3index, + const struct tcp_ao_hdr *aoh) { return SKB_NOT_DROPPED_YET; } static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, - const union tcp_ao_addr *addr, + int l3index, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port) { return NULL; diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 9e3d7083af7d..a994a3405a67 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -337,6 +337,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb) struct rtable *rt; __u8 rcv_wscale; struct flowi4 fl4; + int l3index; u32 tsoff = 0; if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies) || @@ -394,13 +395,14 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb) treq->snt_synack = 0; treq->tfo_listener = false; - tcp_ao_syncookie(sk, skb, treq, AF_INET); - if (IS_ENABLED(CONFIG_SMC)) ireq->smc_ok = 0; ireq->ir_iif = inet_request_bound_dev_if(sk, skb); + l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); + tcp_ao_syncookie(sk, skb, treq, AF_INET, l3index); + /* We throwed the options of the initial SYN away, so we hope * the ACK carries the same options again (see RFC1122 4.2.3.8) */ diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 3538321a742f..cab69662e4d9 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -148,7 +148,7 @@ static inline int ipv4_prefix_cmp(const struct in_addr *addr1, return ((addr1->s_addr & mask) > (addr2->s_addr & mask)) ? 1 : -1; } -static int __tcp_ao_key_cmp(const struct tcp_ao_key *key, +static int __tcp_ao_key_cmp(const struct tcp_ao_key *key, int l3index, const union tcp_ao_addr *addr, u8 prefixlen, int family, int sndid, int rcvid, u16 port) { @@ -158,6 +158,10 @@ static int __tcp_ao_key_cmp(const struct tcp_ao_key *key, return (key->rcvid > rcvid) ? 1 : -1; if (port != 0 && key->port != 0 && port != key->port) return (key->port > port) ? 1 : -1; + if (l3index >= 0 && (key->keyflags & TCP_AO_KEYF_IFINDEX)) { + if (key->l3index != l3index) + return (key->l3index > l3index) ? 1 : -1; + } if (family == AF_UNSPEC) return 0; @@ -182,7 +186,7 @@ static int __tcp_ao_key_cmp(const struct tcp_ao_key *key, return -1; } -static int tcp_ao_key_cmp(const struct tcp_ao_key *key, +static int tcp_ao_key_cmp(const struct tcp_ao_key *key, int l3index, const union tcp_ao_addr *addr, u8 prefixlen, int family, int sndid, int rcvid, u16 port) { @@ -190,14 +194,16 @@ static int tcp_ao_key_cmp(const struct tcp_ao_key *key, if (family == AF_INET6 && ipv6_addr_v4mapped(&addr->a6)) { __be32 addr4 = addr->a6.s6_addr32[3]; - return __tcp_ao_key_cmp(key, (union tcp_ao_addr *)&addr4, + return __tcp_ao_key_cmp(key, l3index, + (union tcp_ao_addr *)&addr4, prefixlen, AF_INET, sndid, rcvid, port); } #endif - return __tcp_ao_key_cmp(key, addr, prefixlen, family, sndid, rcvid, port); + return __tcp_ao_key_cmp(key, l3index, addr, + prefixlen, family, sndid, rcvid, port); } -static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk, +static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk, int l3index, const union tcp_ao_addr *addr, int family, u8 prefix, int sndid, int rcvid, u16 port) { @@ -215,18 +221,18 @@ static struct tcp_ao_key *__tcp_ao_do_lookup(const struct sock *sk, hlist_for_each_entry_rcu(key, &ao->head, node) { u8 prefixlen = min(prefix, key->prefixlen); - if (!tcp_ao_key_cmp(key, addr, prefixlen, + if (!tcp_ao_key_cmp(key, l3index, addr, prefixlen, family, sndid, rcvid, port)) return key; } return NULL; } -struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, +struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, int l3index, const union tcp_ao_addr *addr, int family, int sndid, int rcvid, u16 port) { - return __tcp_ao_do_lookup(sk, addr, family, U8_MAX, + return __tcp_ao_do_lookup(sk, l3index, addr, family, U8_MAX, sndid, rcvid, port); } EXPORT_SYMBOL_GPL(tcp_ao_do_lookup); @@ -669,40 +675,45 @@ struct tcp_ao_key *tcp_v4_ao_lookup_rsk(const struct sock *sk, struct request_sock *req, int sndid, int rcvid) { - union tcp_ao_addr *addr = - (union tcp_ao_addr *)&inet_rsk(req)->ir_rmt_addr; + struct inet_request_sock *ireq = inet_rsk(req); + union tcp_ao_addr *addr = (union tcp_ao_addr *)&ireq->ir_rmt_addr; + int l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); - return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0); + return tcp_ao_do_lookup(sk, l3index, addr, AF_INET, sndid, rcvid, 0); } struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid) { union tcp_ao_addr *addr = (union tcp_ao_addr *)&addr_sk->sk_daddr; + int l3index = l3mdev_master_ifindex_by_index(sock_net(sk), + addr_sk->sk_bound_dev_if); - return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid, 0); + return tcp_ao_do_lookup(sk, l3index, addr, AF_INET, sndid, rcvid, 0); } static struct tcp_ao_key *tcp_ao_inbound_lookup(unsigned short int family, const struct sock *sk, const struct sk_buff *skb, - int sndid, int rcvid) + int sndid, int rcvid, int l3index) { if (family == AF_INET) { const struct iphdr *iph = ip_hdr(skb); - return tcp_ao_do_lookup(sk, (union tcp_ao_addr *)&iph->saddr, - AF_INET, sndid, rcvid, 0); + return tcp_ao_do_lookup(sk, l3index, + (union tcp_ao_addr *)&iph->saddr, + AF_INET, sndid, rcvid, 0); } else { const struct ipv6hdr *iph = ipv6_hdr(skb); - return tcp_ao_do_lookup(sk, (union tcp_ao_addr *)&iph->saddr, - AF_INET6, sndid, rcvid, 0); + return tcp_ao_do_lookup(sk, l3index, + (union tcp_ao_addr *)&iph->saddr, + AF_INET6, sndid, rcvid, 0); } } void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, struct tcp_request_sock *treq, - unsigned short int family) + unsigned short int family, int l3index) { const struct tcphdr *th = tcp_hdr(skb); const struct tcp_ao_hdr *aoh; @@ -717,7 +728,7 @@ void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb, if (!aoh) return; - key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid); + key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid, l3index); if (!key) /* Key not found, continue without TCP-AO */ return; @@ -732,7 +743,7 @@ static enum skb_drop_reason tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, unsigned short int family, struct tcp_ao_info *info, const struct tcp_ao_hdr *aoh, struct tcp_ao_key *key, - u8 *traffic_key, u8 *phash, u32 sne) + u8 *traffic_key, u8 *phash, u32 sne, int l3index) { unsigned char newhash[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; u8 maclen = aoh->length - sizeof(struct tcp_ao_hdr); @@ -743,7 +754,8 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, atomic64_inc(&info->counters.pkt_bad); atomic64_inc(&key->pkt_bad); tcp_hash_fail("AO hash wrong length", family, skb, - "%u != %d", maclen, tcp_ao_maclen(key)); + "%u != %d L3index: %d", maclen, + tcp_ao_maclen(key), l3index); return SKB_DROP_REASON_TCP_AOFAILURE; } @@ -754,7 +766,8 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOBAD); atomic64_inc(&info->counters.pkt_bad); atomic64_inc(&key->pkt_bad); - tcp_hash_fail("AO hash mismatch", family, skb, ""); + tcp_hash_fail("AO hash mismatch", family, skb, + "L3index: %d", l3index); return SKB_DROP_REASON_TCP_AOFAILURE; } NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOGOOD); @@ -766,7 +779,7 @@ tcp_ao_verify_hash(const struct sock *sk, const struct sk_buff *skb, enum skb_drop_reason tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, unsigned short int family, const struct request_sock *req, - const struct tcp_ao_hdr *aoh) + int l3index, const struct tcp_ao_hdr *aoh) { u8 key_buf[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; const struct tcphdr *th = tcp_hdr(skb); @@ -781,7 +794,7 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, if (!info) { NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND); tcp_hash_fail("AO key not found", family, skb, - "keyid: %u", aoh->keyid); + "keyid: %u L3index: %d", aoh->keyid, l3index); return SKB_DROP_REASON_TCP_AOUNEXPECTED; } @@ -816,7 +829,7 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, /* Established socket, traffic key are cached */ traffic_key = rcv_other_key(key); err = tcp_ao_verify_hash(sk, skb, family, info, aoh, key, - traffic_key, phash, sne); + traffic_key, phash, sne, l3index); if (err) return err; current_key = READ_ONCE(info->current_key); @@ -837,7 +850,7 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, * - request sockets would race on those key pointers * - tcp_ao_del_cmd() allows async key removal */ - key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid); + key = tcp_ao_inbound_lookup(family, sk, skb, -1, aoh->keyid, l3index); if (!key) goto key_not_found; @@ -875,13 +888,13 @@ tcp_inbound_ao_hash(struct sock *sk, const struct sk_buff *skb, traffic_key = key_buf; tcp_ao_calc_key_skb(key, traffic_key, skb, sisn, disn, family); return tcp_ao_verify_hash(sk, skb, family, info, aoh, key, - traffic_key, phash, sne); + traffic_key, phash, sne, l3index); key_not_found: NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAOKEYNOTFOUND); atomic64_inc(&info->counters.key_not_found); tcp_hash_fail("Requested by the peer AO key id not found", - family, skb, ""); + family, skb, "L3index: %d", l3index); return SKB_DROP_REASON_TCP_AOKEYNOTFOUND; } EXPORT_SYMBOL_GPL(tcp_inbound_ao_hash); @@ -910,7 +923,7 @@ void tcp_ao_connect_init(struct sock *sk) struct tcp_ao_key *key; struct tcp_sock *tp = tcp_sk(sk); union tcp_ao_addr *addr; - int family; + int family, l3index; ao_info = rcu_dereference_protected(tp->ao_info, lockdep_sock_is_held(sk)); @@ -927,9 +940,11 @@ void tcp_ao_connect_init(struct sock *sk) #endif else return; + l3index = l3mdev_master_ifindex_by_index(sock_net(sk), + sk->sk_bound_dev_if); hlist_for_each_entry_rcu(key, &ao_info->head, node) { - if (tcp_ao_key_cmp(key, addr, key->prefixlen, family, + if (tcp_ao_key_cmp(key, l3index, addr, key->prefixlen, family, -1, -1, sk->sk_dport) == 0) continue; @@ -993,7 +1008,7 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk, struct hlist_node *key_head; union tcp_ao_addr *addr; bool match = false; - int ret = -ENOMEM; + int l3index, ret = -ENOMEM; ao = rcu_dereference(tcp_sk(sk)->ao_info); if (!ao) @@ -1021,9 +1036,11 @@ int tcp_ao_copy_all_matching(const struct sock *sk, struct sock *newsk, ret = -EAFNOSUPPORT; goto free_ao; } + l3index = l3mdev_master_ifindex_by_index(sock_net(newsk), + newsk->sk_bound_dev_if); hlist_for_each_entry_rcu(key, &ao->head, node) { - if (tcp_ao_key_cmp(key, addr, key->prefixlen, family, + if (tcp_ao_key_cmp(key, l3index, addr, key->prefixlen, family, -1, -1, 0)) continue; @@ -1356,17 +1373,18 @@ static inline int tcp_ao_verify_ipv6(struct sock *sk, struct tcp_ao_add *cmd, } #endif -#define TCP_AO_KEYF_ALL (TCP_AO_KEYF_EXCLUDE_OPT) +#define TCP_AO_KEYF_ALL (TCP_AO_KEYF_IFINDEX | TCP_AO_KEYF_EXCLUDE_OPT) +#define TCP_AO_GET_KEYF_VALID (TCP_AO_KEYF_IFINDEX) static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, sockptr_t optval, int optlen) { struct tcp_ao_info *ao_info; + int ret, size, l3index = 0; union tcp_ao_addr *addr; struct tcp_ao_key *key; struct tcp_ao_add cmd; bool first = false; - int ret, size; u16 port; if (optlen < sizeof(cmd)) @@ -1397,9 +1415,46 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, return -EINVAL; } + if (cmd.ifindex && !(cmd.keyflags & TCP_AO_KEYF_IFINDEX)) + return -EINVAL; + + /* For cmd.tcp_ifindex = 0 the key will apply to the default VRF */ + if (cmd.keyflags & TCP_AO_KEYF_IFINDEX && cmd.ifindex) { + int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); + struct net_device *dev; + + rcu_read_lock(); + dev = dev_get_by_index_rcu(sock_net(sk), cmd.ifindex); + if (dev && netif_is_l3_master(dev)) + l3index = dev->ifindex; + rcu_read_unlock(); + + if (!dev || !l3index) + return -EINVAL; + + /* It's still possible to bind after adding keys or even + * re-bind to a different dev (with CAP_NET_RAW). + * So, no reason to return error here, rather try to be + * nice and warn the user. + */ + if (bound_dev_if && bound_dev_if != cmd.ifindex) + net_warn_ratelimited("AO key ifindex %d != sk bound ifindex %d\n", + cmd.ifindex, bound_dev_if); + } + /* Don't allow keys for peers that have a matching TCP-MD5 key */ - if (tcp_md5_do_lookup_any_l3index(sk, addr, family)) - return -EKEYREJECTED; + if (cmd.keyflags & TCP_AO_KEYF_IFINDEX) { + /* Non-_exact version of tcp_md5_do_lookup() will + * as well match keys that aren't bound to a specific VRF + * (that will make them match AO key with + * sysctl_tcp_l3dev_accept = 1 + */ + if (tcp_md5_do_lookup(sk, l3index, addr, family)) + return -EKEYREJECTED; + } else { + if (tcp_md5_do_lookup_any_l3index(sk, addr, family)) + return -EKEYREJECTED; + } ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); @@ -1415,10 +1470,10 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, * > The IDs of MKTs MUST NOT overlap where their * > TCP connection identifiers overlap. */ - if (__tcp_ao_do_lookup(sk, addr, family, + if (__tcp_ao_do_lookup(sk, l3index, addr, family, cmd.prefix, -1, cmd.rcvid, port)) return -EEXIST; - if (__tcp_ao_do_lookup(sk, addr, family, + if (__tcp_ao_do_lookup(sk, l3index, addr, family, cmd.prefix, cmd.sndid, -1, port)) return -EEXIST; } @@ -1443,6 +1498,7 @@ static int tcp_ao_add_cmd(struct sock *sk, unsigned short int family, key->keyflags = cmd.keyflags; key->sndid = cmd.sndid; key->rcvid = cmd.rcvid; + key->l3index = l3index; atomic64_set(&key->pkt_good, 0); atomic64_set(&key->pkt_bad, 0); @@ -1530,17 +1586,17 @@ static int tcp_ao_delete_key(struct sock *sk, struct tcp_ao_info *ao_info, return err; } +#define TCP_AO_DEL_KEYF_ALL (TCP_AO_KEYF_IFINDEX) static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family, sockptr_t optval, int optlen) { struct tcp_ao_key *key, *new_current = NULL, *new_rnext = NULL; + int err, addr_len, l3index = 0; struct tcp_ao_info *ao_info; union tcp_ao_addr *addr; struct tcp_ao_del cmd; - int err; __u8 prefix; __be16 port; - int addr_len; if (optlen < sizeof(cmd)) return -EINVAL; @@ -1557,6 +1613,17 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family, return -EINVAL; } + if (cmd.keyflags & ~TCP_AO_DEL_KEYF_ALL) + return -EINVAL; + + /* No sanity check for TCP_AO_KEYF_IFINDEX as if a VRF + * was destroyed, there still should be a way to delete keys, + * that were bound to that l3intf. So, fail late at lookup stage + * if there is no key for that ifindex. + */ + if (cmd.ifindex && !(cmd.keyflags & TCP_AO_KEYF_IFINDEX)) + return -EINVAL; + ao_info = rcu_dereference_protected(tcp_sk(sk)->ao_info, lockdep_sock_is_held(sk)); if (!ao_info) @@ -1620,6 +1687,13 @@ static int tcp_ao_del_cmd(struct sock *sk, unsigned short int family, memcmp(addr, &key->addr, addr_len)) continue; + if ((cmd.keyflags & TCP_AO_KEYF_IFINDEX) != + (key->keyflags & TCP_AO_KEYF_IFINDEX)) + continue; + + if (key->l3index != l3index) + continue; + if (key == new_current || key == new_rnext) continue; @@ -1804,10 +1878,10 @@ static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info, struct tcp_ao_key *key, *current_key; bool do_address_matching = true; union tcp_ao_addr *addr = NULL; + int err, l3index, user_len; unsigned int max_keys; /* maximum number of keys to copy to user */ size_t out_offset = 0; size_t bytes_to_write; /* number of bytes to write to user level */ - int err, user_len; u32 matched_keys; /* keys from ao_info matched so far */ int optlen_out; u16 port = 0; @@ -1826,11 +1900,16 @@ static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info, if (opt_in.pkt_good || opt_in.pkt_bad) return -EINVAL; + if (opt_in.keyflags & ~TCP_AO_GET_KEYF_VALID) + return -EINVAL; + if (opt_in.ifindex && !(opt_in.keyflags & TCP_AO_KEYF_IFINDEX)) + return -EINVAL; if (opt_in.reserved != 0) return -EINVAL; max_keys = opt_in.nkeys; + l3index = (opt_in.keyflags & TCP_AO_KEYF_IFINDEX) ? opt_in.ifindex : -1; if (opt_in.get_all || opt_in.is_current || opt_in.is_rnext) { if (opt_in.get_all && (opt_in.is_current || opt_in.is_rnext)) @@ -1932,7 +2011,7 @@ static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info, continue; } - if (tcp_ao_key_cmp(key, addr, opt_in.prefix, + if (tcp_ao_key_cmp(key, l3index, addr, opt_in.prefix, opt_in.addr.ss_family, opt_in.sndid, opt_in.rcvid, port) != 0) continue; @@ -1965,6 +2044,7 @@ static int tcp_ao_copy_mkts_to_user(struct tcp_ao_info *ao_info, opt_out.nkeys = 0; opt_out.maclen = key->maclen; opt_out.keylen = key->keylen; + opt_out.ifindex = key->l3index; opt_out.pkt_good = atomic64_read(&key->pkt_good); opt_out.pkt_bad = atomic64_read(&key->pkt_bad); memcpy(&opt_out.key, key->key, key->keylen); diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 791453dabf88..4338eb7b544f 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1096,6 +1096,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, struct tcp_ao_key *ao_key = NULL; const union tcp_md5_addr *addr; u8 keyid = 0; + int l3index; #ifdef CONFIG_TCP_AO u8 traffic_key[TCP_AO_MAX_HASH_SIZE] __tcp_ao_key_align; const struct tcp_ao_hdr *aoh; @@ -1109,6 +1110,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq = (sk->sk_state == TCP_LISTEN) ? tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt; addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr; + l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0; if (tcp_rsk_used_ao(req)) { #ifdef CONFIG_TCP_AO @@ -1119,11 +1121,11 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, if (!aoh) return; - ao_key = tcp_ao_do_lookup(sk, addr, AF_INET, + ao_key = tcp_ao_do_lookup(sk, l3index, addr, AF_INET, aoh->rnext_keyid, -1, 0); if (unlikely(!ao_key)) { /* Send ACK with any matching MKT for the peer */ - ao_key = tcp_ao_do_lookup(sk, addr, + ao_key = tcp_ao_do_lookup(sk, l3index, addr, AF_INET, -1, -1, 0); /* Matching key disappeared (user removed the key?) * let the handshake timeout. @@ -1142,9 +1144,6 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, tcp_v4_ao_calc_key_rsk(ao_key, traffic_key, req); #endif } else { - int l3index; - - l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0; md5_key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET); } /* RFC 7323 2.3 @@ -1502,6 +1501,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, const union tcp_md5_addr *addr; u8 prefixlen = 32; int l3index = 0; + bool l3flag; u8 flags; if (optlen < sizeof(cmd)) @@ -1514,6 +1514,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, return -EINVAL; flags = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX; + l3flag = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX; if (optname == TCP_MD5SIG_EXT && cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { @@ -1551,7 +1552,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname, /* Don't allow keys for peers that have a matching TCP-AO key. * See the comment in tcp_ao_add_cmd() */ - if (tcp_ao_required(sk, addr, AF_INET, false)) + if (tcp_ao_required(sk, addr, AF_INET, l3flag ? l3index : -1, false)) return -EKEYREJECTED; return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags, diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index ad7a8caa7b2a..500f6ed3b8cf 100644 --- a/net/ipv6/syncookies.c +++ b/net/ipv6/syncookies.c @@ -140,6 +140,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) struct dst_entry *dst; __u8 rcv_wscale; u32 tsoff = 0; + int l3index; if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies) || !th->ack || th->rst) @@ -214,7 +215,9 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb) treq->snt_isn = cookie; treq->ts_off = 0; treq->txhash = net_tx_rndhash(); - tcp_ao_syncookie(sk, skb, treq, AF_INET6); + + l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); + tcp_ao_syncookie(sk, skb, treq, AF_INET6, l3index); if (IS_ENABLED(CONFIG_SMC)) ireq->smc_ok = 0; diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c index 32e19b2dbda8..16e0fbc08c9f 100644 --- a/net/ipv6/tcp_ao.c +++ b/net/ipv6/tcp_ao.c @@ -79,21 +79,16 @@ int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, } EXPORT_SYMBOL_GPL(tcp_v6_ao_calc_key_rsk); -struct tcp_ao_key *tcp_v6_ao_do_lookup(const struct sock *sk, - const struct in6_addr *addr, - int sndid, int rcvid) -{ - return tcp_ao_do_lookup(sk, (union tcp_ao_addr *)addr, AF_INET6, - sndid, rcvid, 0); -} - struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, struct sock *addr_sk, int sndid, int rcvid) { struct in6_addr *addr = &addr_sk->sk_v6_daddr; + int l3index = l3mdev_master_ifindex_by_index(sock_net(sk), + addr_sk->sk_bound_dev_if); - return tcp_v6_ao_do_lookup(sk, addr, sndid, rcvid); + return tcp_ao_do_lookup(sk, l3index, (union tcp_ao_addr *)addr, + AF_INET6, sndid, rcvid, 0); } EXPORT_SYMBOL_GPL(tcp_v6_ao_lookup); @@ -101,9 +96,12 @@ struct tcp_ao_key *tcp_v6_ao_lookup_rsk(const struct sock *sk, struct request_sock *req, int sndid, int rcvid) { - struct in6_addr *addr = &inet_rsk(req)->ir_v6_rmt_addr; + struct inet_request_sock *ireq = inet_rsk(req); + struct in6_addr *addr = &ireq->ir_v6_rmt_addr; + int l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); - return tcp_v6_ao_do_lookup(sk, addr, sndid, rcvid); + return tcp_ao_do_lookup(sk, l3index, (union tcp_ao_addr *)addr, + AF_INET6, sndid, rcvid, 0); } EXPORT_SYMBOL_GPL(tcp_v6_ao_lookup_rsk); diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 3ed15011876b..83854ed033fe 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -610,6 +610,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, union tcp_ao_addr *addr; int l3index = 0; u8 prefixlen; + bool l3flag; u8 flags; if (optlen < sizeof(cmd)) @@ -622,6 +623,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, return -EINVAL; flags = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX; + l3flag = cmd.tcpm_flags & TCP_MD5SIG_FLAG_IFINDEX; if (optname == TCP_MD5SIG_EXT && cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { @@ -668,7 +670,8 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, /* Don't allow keys for peers that have a matching TCP-AO key. * See the comment in tcp_ao_add_cmd() */ - if (tcp_ao_required(sk, addr, AF_INET, false)) + if (tcp_ao_required(sk, addr, AF_INET, + l3flag ? l3index : -1, false)) return -EKEYREJECTED; return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index, flags, @@ -680,7 +683,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, /* Don't allow keys for peers that have a matching TCP-AO key. * See the comment in tcp_ao_add_cmd() */ - if (tcp_ao_required(sk, addr, AF_INET6, false)) + if (tcp_ao_required(sk, addr, AF_INET6, l3flag ? l3index : -1, false)) return -EKEYREJECTED; return tcp_md5_do_add(sk, addr, AF_INET6, prefixlen, l3index, flags, @@ -1271,10 +1274,14 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, return; if (!aoh) return; - ao_key = tcp_v6_ao_do_lookup(sk, addr, aoh->rnext_keyid, -1); + ao_key = tcp_ao_do_lookup(sk, l3index, + (union tcp_ao_addr *)addr, AF_INET6, + aoh->rnext_keyid, -1, 0); if (unlikely(!ao_key)) { /* Send ACK with any matching MKT for the peer */ - ao_key = tcp_v6_ao_do_lookup(sk, addr, -1, -1); + ao_key = tcp_ao_do_lookup(sk, l3index, + (union tcp_ao_addr *)addr, + AF_INET6, -1, -1, 0); /* Matching key disappeared (user removed the key?) * let the handshake timeout. */