From patchwork Fri Sep 2 00:29:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin KaFai Lau X-Patchwork-Id: 12963459 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85798C6FA83 for ; Fri, 2 Sep 2022 00:31:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233383AbiIBAbz (ORCPT ); Thu, 1 Sep 2022 20:31:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233680AbiIBAbx (ORCPT ); Thu, 1 Sep 2022 20:31:53 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5595D9E12E for ; Thu, 1 Sep 2022 17:31:52 -0700 (PDT) Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 28208o7K014905 for ; Thu, 1 Sep 2022 17:31:51 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=4+sVCcFZwXieA2KfXfVcdVY3xeeUo8BOsYsivkN5O8A=; b=NglpkU97E7oaXo2H0liuuAFiMIdO9aMq+N1PZYFIe7qWp+MkfdjXSA+Yr698hrIIR5Jm GTr8xQXtw1OWtScwXYfA0RLwEnjIDVhcw8hu6QsTvJ84KizZ0arnSzquqSUL53M3cKUZ UMR+b74BBAoe167UP7UkOZXu+WM1Xfz7scA= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3jat6s5jpf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 01 Sep 2022 17:31:51 -0700 Received: from twshared10425.14.frc2.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Thu, 1 Sep 2022 17:31:50 -0700 Received: by devbig933.frc1.facebook.com (Postfix, from userid 6611) id 9C0C68C47CEE; Thu, 1 Sep 2022 17:29:31 -0700 (PDT) From: Martin KaFai Lau To: , CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , David Miller , Eric Dumazet , Jakub Kicinski , , Paolo Abeni , Martin KaFai Lau Subject: [PATCH v2 bpf-next 16/17] bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt() Date: Thu, 1 Sep 2022 17:29:31 -0700 Message-ID: <20220902002931.2896218-1-kafai@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220902002750.2887415-1-kafai@fb.com> References: <20220902002750.2887415-1-kafai@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: lEOFf9PBpqwmnwK-VzotdvocGB-6MuzF X-Proofpoint-ORIG-GUID: lEOFf9PBpqwmnwK-VzotdvocGB-6MuzF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-09-01_12,2022-08-31_03,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Martin KaFai Lau This patch changes bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt(). It removes the duplicated code from bpf_getsockopt(SOL_IPV6). This also makes bpf_getsockopt(SOL_IPV6) supporting the same set of optnames as in bpf_setsockopt(SOL_IPV6). In particular, this adds IPV6_AUTOFLOWLABEL support to bpf_getsockopt(SOL_IPV6). ipv6 could be compiled as a module. Like how other code solved it with stubs in ipv6_stubs.h, this patch adds the do_ipv6_getsockopt to the ipv6_bpf_stub. Signed-off-by: Martin KaFai Lau --- include/net/ipv6.h | 2 ++ include/net/ipv6_stubs.h | 2 ++ net/core/filter.c | 55 ++++++++++++++++++---------------------- net/ipv6/af_inet6.c | 1 + net/ipv6/ipv6_sockglue.c | 4 +-- 5 files changed, 31 insertions(+), 33 deletions(-) diff --git a/include/net/ipv6.h b/include/net/ipv6.h index a4f24573ed7a..d664ba5812d8 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -1160,6 +1160,8 @@ int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval unsigned int optlen); int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen); +int do_ipv6_getsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, sockptr_t optlen); int ipv6_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); diff --git a/include/net/ipv6_stubs.h b/include/net/ipv6_stubs.h index 8692698b01cf..c48186bf4737 100644 --- a/include/net/ipv6_stubs.h +++ b/include/net/ipv6_stubs.h @@ -83,6 +83,8 @@ struct ipv6_bpf_stub { struct sk_buff *skb); int (*ipv6_setsockopt)(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen); + int (*ipv6_getsockopt)(struct sock *sk, int level, int optname, + sockptr_t optval, sockptr_t optlen); }; extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; diff --git a/net/core/filter.c b/net/core/filter.c index a9d88fd0541e..b3962c05b5da 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5187,8 +5187,9 @@ static int sol_ip_sockopt(struct sock *sk, int optname, KERNEL_SOCKPTR(optval), *optlen); } -static int sol_ipv6_setsockopt(struct sock *sk, int optname, - char *optval, int optlen) +static int sol_ipv6_sockopt(struct sock *sk, int optname, + char *optval, int *optlen, + bool getopt) { if (sk->sk_family != AF_INET6) return -EINVAL; @@ -5196,15 +5197,20 @@ static int sol_ipv6_setsockopt(struct sock *sk, int optname, switch (optname) { case IPV6_TCLASS: case IPV6_AUTOFLOWLABEL: - if (optlen != sizeof(int)) + if (*optlen != sizeof(int)) return -EINVAL; break; default: return -EINVAL; } + if (getopt) + return ipv6_bpf_stub->ipv6_getsockopt(sk, SOL_IPV6, optname, + KERNEL_SOCKPTR(optval), + KERNEL_SOCKPTR(optlen)); + return ipv6_bpf_stub->ipv6_setsockopt(sk, SOL_IPV6, optname, - KERNEL_SOCKPTR(optval), optlen); + KERNEL_SOCKPTR(optval), *optlen); } static int __bpf_setsockopt(struct sock *sk, int level, int optname, @@ -5218,7 +5224,7 @@ static int __bpf_setsockopt(struct sock *sk, int level, int optname, else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) return sol_ip_sockopt(sk, optname, optval, &optlen, false); else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) - return sol_ipv6_setsockopt(sk, optname, optval, optlen); + return sol_ipv6_sockopt(sk, optname, optval, &optlen, false); else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) return sol_tcp_sockopt(sk, optname, optval, &optlen, false); @@ -5236,43 +5242,30 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname, static int __bpf_getsockopt(struct sock *sk, int level, int optname, char *optval, int optlen) { - int err = 0, saved_optlen = optlen; + int err, saved_optlen = optlen; - if (!sk_fullsock(sk)) - goto err_clear; + if (!sk_fullsock(sk)) { + err = -EINVAL; + goto done; + } - if (level == SOL_SOCKET) { + if (level == SOL_SOCKET) err = sol_socket_sockopt(sk, optname, optval, &optlen, true); - } else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) { + else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) err = sol_tcp_sockopt(sk, optname, optval, &optlen, true); - } else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) { + else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) err = sol_ip_sockopt(sk, optname, optval, &optlen, true); - } else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) { - struct ipv6_pinfo *np = inet6_sk(sk); - - if (optlen != sizeof(int) || sk->sk_family != AF_INET6) - goto err_clear; - - /* Only some options are supported */ - switch (optname) { - case IPV6_TCLASS: - *((int *)optval) = (int)np->tclass; - break; - default: - goto err_clear; - } - } else { - goto err_clear; - } + else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) + err = sol_ipv6_sockopt(sk, optname, optval, &optlen, true); + else + err = -EINVAL; +done: if (err) optlen = 0; if (optlen < saved_optlen) memset(optval + optlen, 0, saved_optlen - optlen); return err; -err_clear: - memset(optval, 0, optlen); - return -EINVAL; } static int _bpf_getsockopt(struct sock *sk, int level, int optname, diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index cadc97852787..19732b5dce23 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -1058,6 +1058,7 @@ static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = { .inet6_bind = __inet6_bind, .udp6_lib_lookup = __udp6_lib_lookup, .ipv6_setsockopt = do_ipv6_setsockopt, + .ipv6_getsockopt = do_ipv6_getsockopt, }; static int __init inet6_init(void) diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index d9887e3a6077..1193f5a5247d 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -1131,8 +1131,8 @@ static int compat_ipv6_get_msfilter(struct sock *sk, sockptr_t optval, return 0; } -static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, - sockptr_t optval, sockptr_t optlen) +int do_ipv6_getsockopt(struct sock *sk, int level, int optname, + sockptr_t optval, sockptr_t optlen) { struct ipv6_pinfo *np = inet6_sk(sk); int len;