From patchwork Thu Jul 23 11:50:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 11680729 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 37F02159A for ; Thu, 23 Jul 2020 11:51:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0CC6B2086A for ; Thu, 23 Jul 2020 11:51:05 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="hK0eegj3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728539AbgGWLuk (ORCPT ); Thu, 23 Jul 2020 07:50:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52764 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728472AbgGWLui (ORCPT ); Thu, 23 Jul 2020 07:50:38 -0400 Received: from mail-ej1-x642.google.com (mail-ej1-x642.google.com [IPv6:2a00:1450:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98FFFC0619E2 for ; Thu, 23 Jul 2020 04:50:37 -0700 (PDT) Received: by mail-ej1-x642.google.com with SMTP id f12so6037208eja.9 for ; Thu, 23 Jul 2020 04:50:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=spcPVSlrARw7W1Rwzkh4b8DIrp6t2zL8nGHIVYSMDCo=; b=hK0eegj35jA7vl/U8plOf/XnYbmiUntIvYa78Ti6SbkdTxHEV/FFsE/8JRoY7FMHLs 4UeDzsxd/SrHLlSzEKvzCf1VoIxNLSdBaBVR3CtT9zARf5yGrEDJgaptQofcCAQM7eWQ wcDGUny+0kloJsrKBoVZLWZhECHcmCPlP7nmo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=spcPVSlrARw7W1Rwzkh4b8DIrp6t2zL8nGHIVYSMDCo=; b=HVAyV9MsfPKFvjRLZoHGyDMr0iTB5ay9DZjTVpkVoXCpLiWiRpeUIwI5sx/BIw0LyT u6IfikkvMQsxv2AwZkPbQjOebZo7ccGhjuWmg7JlLMFzSEFss3d8zucqJr+VuMMgfxeO A3k2kNDx9uUJJmerWBNJWJevQjbHEkVbISMXO2jH2+g2g1isk2ZwsAtzcRT1u3B+GJ59 6w+3NZuDZeZ+FEjoZl6l/vpGdvXwK8odVLzO064RY+4KEFyctxBm7zH0JwNZsVE2x+hx B9GVTwcKBpcbhA2QW/SF7zmVxJdFh2a5MywMOqpwbI3LZGaXVI3Gp1YdhJ+BSQRArTzc lsZQ== X-Gm-Message-State: AOAM531YiTDhN3oOtGNjqP1/1AM+XgjJFoirVfPxPMB0dXVYit28/MiZ vVS/s6yIYAKGnUps91DtRso+wg== X-Google-Smtp-Source: ABdhPJzR264zsryipAqIRimd0obb4ZGDewIv7jVBJdu4CRQGWukM7PZz5ycxZMRTHBaFuDeq8D3dJw== X-Received: by 2002:a17:907:a92:: with SMTP id by18mr75212ejc.116.1595505035924; Thu, 23 Jul 2020 04:50:35 -0700 (PDT) Received: from kpsingh.zrh.corp.google.com ([81.6.44.51]) by smtp.gmail.com with ESMTPSA id h27sm579302eje.23.2020.07.23.04.50.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jul 2020 04:50:35 -0700 (PDT) From: KP Singh To: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-security-module@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Paul Turner , Jann Horn , Florent Revest Subject: [PATCH bpf-next v6 1/7] bpf: Renames to prepare for generalizing sk_storage. Date: Thu, 23 Jul 2020 13:50:26 +0200 Message-Id: <20200723115032.460770-2-kpsingh@chromium.org> X-Mailer: git-send-email 2.28.0.rc0.105.gf9edc3c819-goog In-Reply-To: <20200723115032.460770-1-kpsingh@chromium.org> References: <20200723115032.460770-1-kpsingh@chromium.org> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: From: KP Singh A purely mechanical change to split the renaming from the actual generalization. Flags/consts: SK_STORAGE_CREATE_FLAG_MASK BPF_LOCAL_STORAGE_CREATE_FLAG_MASK BPF_SK_STORAGE_CACHE_SIZE BPF_LOCAL_STORAGE_CACHE_SIZE MAX_VALUE_SIZE BPF_LOCAL_STORAGE_MAX_VALUE_SIZE Structs: bucket bpf_local_storage_map_bucket bpf_sk_storage_map bpf_local_storage_map bpf_sk_storage_data bpf_local_storage_data bpf_sk_storage_elem bpf_local_storage_elem bpf_sk_storage bpf_local_storage selem_linked_to_sk selem_linked_to_storage selem_alloc bpf_selem_alloc The "sk" member in bpf_local_storage is also updated to "owner" in preparation for changing the type to void * in a subsequent patch. Functions: __selem_unlink_sk bpf_selem_unlink_storage __selem_link_sk bpf_selem_link_storage selem_unlink_sk __bpf_selem_unlink_storage sk_storage_update bpf_local_storage_update __sk_storage_lookup bpf_local_storage_lookup bpf_sk_storage_map_free bpf_local_storage_map_free bpf_sk_storage_map_alloc bpf_local_storage_map_alloc bpf_sk_storage_map_alloc_check bpf_local_storage_map_alloc_check bpf_sk_storage_map_check_btf bpf_local_storage_map_check_btf Signed-off-by: KP Singh --- include/net/sock.h | 4 +- net/core/bpf_sk_storage.c | 405 +++++++++++++++++++------------------- 2 files changed, 208 insertions(+), 201 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 62e18fc8ac9f..eca29a7475c1 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -245,7 +245,7 @@ struct sock_common { /* public: */ }; -struct bpf_sk_storage; +struct bpf_local_storage; /** * struct sock - network layer representation of sockets @@ -516,7 +516,7 @@ struct sock { void (*sk_destruct)(struct sock *sk); struct sock_reuseport __rcu *sk_reuseport_cb; #ifdef CONFIG_BPF_SYSCALL - struct bpf_sk_storage __rcu *sk_bpf_storage; + struct bpf_local_storage __rcu *sk_bpf_storage; #endif struct rcu_head sk_rcu; }; diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c index 6f921c4ddc2c..fb7ea6f4174d 100644 --- a/net/core/bpf_sk_storage.c +++ b/net/core/bpf_sk_storage.c @@ -11,33 +11,32 @@ #include #include -#define SK_STORAGE_CREATE_FLAG_MASK \ - (BPF_F_NO_PREALLOC | BPF_F_CLONE) +#define BPF_LOCAL_STORAGE_CREATE_FLAG_MASK (BPF_F_NO_PREALLOC | BPF_F_CLONE) -struct bucket { +struct bpf_local_storage_map_bucket { struct hlist_head list; raw_spinlock_t lock; }; -/* Thp map is not the primary owner of a bpf_sk_storage_elem. - * Instead, the sk->sk_bpf_storage is. +/* Thp map is not the primary owner of a bpf_local_storage_elem. + * Instead, the container object (eg. sk->sk_bpf_storage) is. * - * The map (bpf_sk_storage_map) is for two purposes - * 1. Define the size of the "sk local storage". It is + * The map (bpf_local_storage_map) is for two purposes + * 1. Define the size of the "local storage". It is * the map's value_size. * * 2. Maintain a list to keep track of all elems such * that they can be cleaned up during the map destruction. * * When a bpf local storage is being looked up for a - * particular sk, the "bpf_map" pointer is actually used + * particular object, the "bpf_map" pointer is actually used * as the "key" to search in the list of elem in - * sk->sk_bpf_storage. + * the respective bpf_local_storage owned by the object. * - * Hence, consider sk->sk_bpf_storage is the mini-map - * with the "bpf_map" pointer as the searching key. + * e.g. sk->sk_bpf_storage is the mini-map with the "bpf_map" pointer + * as the searching key. */ -struct bpf_sk_storage_map { +struct bpf_local_storage_map { struct bpf_map map; /* Lookup elem does not require accessing the map. * @@ -45,55 +44,57 @@ struct bpf_sk_storage_map { * link/unlink the elem from the map. Having * multiple buckets to improve contention. */ - struct bucket *buckets; + struct bpf_local_storage_map_bucket *buckets; u32 bucket_log; u16 elem_size; u16 cache_idx; }; -struct bpf_sk_storage_data { +struct bpf_local_storage_data { /* smap is used as the searching key when looking up - * from sk->sk_bpf_storage. + * from the object's bpf_local_storage. * * Put it in the same cacheline as the data to minimize * the number of cachelines access during the cache hit case. */ - struct bpf_sk_storage_map __rcu *smap; + struct bpf_local_storage_map __rcu *smap; u8 data[] __aligned(8); }; -/* Linked to bpf_sk_storage and bpf_sk_storage_map */ -struct bpf_sk_storage_elem { - struct hlist_node map_node; /* Linked to bpf_sk_storage_map */ - struct hlist_node snode; /* Linked to bpf_sk_storage */ - struct bpf_sk_storage __rcu *sk_storage; +/* Linked to bpf_local_storage and bpf_local_storage_map */ +struct bpf_local_storage_elem { + struct hlist_node map_node; /* Linked to bpf_local_storage_map */ + struct hlist_node snode; /* Linked to bpf_local_storage */ + struct bpf_local_storage __rcu *local_storage; struct rcu_head rcu; /* 8 bytes hole */ /* The data is stored in aother cacheline to minimize * the number of cachelines access during a cache hit. */ - struct bpf_sk_storage_data sdata ____cacheline_aligned; + struct bpf_local_storage_data sdata ____cacheline_aligned; }; -#define SELEM(_SDATA) container_of((_SDATA), struct bpf_sk_storage_elem, sdata) +#define SELEM(_SDATA) \ + container_of((_SDATA), struct bpf_local_storage_elem, sdata) #define SDATA(_SELEM) (&(_SELEM)->sdata) -#define BPF_SK_STORAGE_CACHE_SIZE 16 +#define BPF_LOCAL_STORAGE_CACHE_SIZE 16 static DEFINE_SPINLOCK(cache_idx_lock); -static u64 cache_idx_usage_counts[BPF_SK_STORAGE_CACHE_SIZE]; +static u64 cache_idx_usage_counts[BPF_LOCAL_STORAGE_CACHE_SIZE]; -struct bpf_sk_storage { - struct bpf_sk_storage_data __rcu *cache[BPF_SK_STORAGE_CACHE_SIZE]; - struct hlist_head list; /* List of bpf_sk_storage_elem */ - struct sock *sk; /* The sk that owns the the above "list" of - * bpf_sk_storage_elem. +struct bpf_local_storage { + struct bpf_local_storage_data __rcu *cache[BPF_LOCAL_STORAGE_CACHE_SIZE]; + struct hlist_head list; /* List of bpf_local_storage_elem */ + struct sock *owner; /* The object that owns the the above "list" of + * bpf_local_storage_elem. */ struct rcu_head rcu; raw_spinlock_t lock; /* Protect adding/removing from the "list" */ }; -static struct bucket *select_bucket(struct bpf_sk_storage_map *smap, - struct bpf_sk_storage_elem *selem) +static struct bpf_local_storage_map_bucket * +select_bucket(struct bpf_local_storage_map *smap, + struct bpf_local_storage_elem *selem) { return &smap->buckets[hash_ptr(selem, smap->bucket_log)]; } @@ -110,21 +111,21 @@ static int omem_charge(struct sock *sk, unsigned int size) return -ENOMEM; } -static bool selem_linked_to_sk(const struct bpf_sk_storage_elem *selem) +static bool selem_linked_to_storage(const struct bpf_local_storage_elem *selem) { return !hlist_unhashed(&selem->snode); } -static bool selem_linked_to_map(const struct bpf_sk_storage_elem *selem) +static bool selem_linked_to_map(const struct bpf_local_storage_elem *selem) { return !hlist_unhashed(&selem->map_node); } -static struct bpf_sk_storage_elem *selem_alloc(struct bpf_sk_storage_map *smap, - struct sock *sk, void *value, - bool charge_omem) +static struct bpf_local_storage_elem * +bpf_selem_alloc(struct bpf_local_storage_map *smap, struct sock *sk, + void *value, bool charge_omem) { - struct bpf_sk_storage_elem *selem; + struct bpf_local_storage_elem *selem; if (charge_omem && omem_charge(sk, smap->elem_size)) return NULL; @@ -146,85 +147,86 @@ static struct bpf_sk_storage_elem *selem_alloc(struct bpf_sk_storage_map *smap, * The caller must ensure selem->smap is still valid to be * dereferenced for its smap->elem_size and smap->cache_idx. */ -static bool __selem_unlink_sk(struct bpf_sk_storage *sk_storage, - struct bpf_sk_storage_elem *selem, - bool uncharge_omem) +static bool bpf_selem_unlink_storage(struct bpf_local_storage *local_storage, + struct bpf_local_storage_elem *selem, + bool uncharge_omem) { - struct bpf_sk_storage_map *smap; - bool free_sk_storage; + struct bpf_local_storage_map *smap; + bool free_local_storage; struct sock *sk; smap = rcu_dereference(SDATA(selem)->smap); - sk = sk_storage->sk; + sk = local_storage->owner; /* All uncharging on sk->sk_omem_alloc must be done first. - * sk may be freed once the last selem is unlinked from sk_storage. + * sk may be freed once the last selem is unlinked from local_storage. */ if (uncharge_omem) atomic_sub(smap->elem_size, &sk->sk_omem_alloc); - free_sk_storage = hlist_is_singular_node(&selem->snode, - &sk_storage->list); - if (free_sk_storage) { - atomic_sub(sizeof(struct bpf_sk_storage), &sk->sk_omem_alloc); - sk_storage->sk = NULL; + free_local_storage = hlist_is_singular_node(&selem->snode, + &local_storage->list); + if (free_local_storage) { + atomic_sub(sizeof(struct bpf_local_storage), &sk->sk_omem_alloc); + local_storage->owner = NULL; /* After this RCU_INIT, sk may be freed and cannot be used */ RCU_INIT_POINTER(sk->sk_bpf_storage, NULL); - /* sk_storage is not freed now. sk_storage->lock is - * still held and raw_spin_unlock_bh(&sk_storage->lock) + /* local_storage is not freed now. local_storage->lock is + * still held and raw_spin_unlock_bh(&local_storage->lock) * will be done by the caller. * * Although the unlock will be done under * rcu_read_lock(), it is more intutivie to - * read if kfree_rcu(sk_storage, rcu) is done - * after the raw_spin_unlock_bh(&sk_storage->lock). + * read if kfree_rcu(local_storage, rcu) is done + * after the raw_spin_unlock_bh(&local_storage->lock). * - * Hence, a "bool free_sk_storage" is returned + * Hence, a "bool free_local_storage" is returned * to the caller which then calls the kfree_rcu() * after unlock. */ } hlist_del_init_rcu(&selem->snode); - if (rcu_access_pointer(sk_storage->cache[smap->cache_idx]) == + if (rcu_access_pointer(local_storage->cache[smap->cache_idx]) == SDATA(selem)) - RCU_INIT_POINTER(sk_storage->cache[smap->cache_idx], NULL); + RCU_INIT_POINTER(local_storage->cache[smap->cache_idx], NULL); kfree_rcu(selem, rcu); - return free_sk_storage; + return free_local_storage; } -static void selem_unlink_sk(struct bpf_sk_storage_elem *selem) +static void __bpf_selem_unlink_storage(struct bpf_local_storage_elem *selem) { - struct bpf_sk_storage *sk_storage; - bool free_sk_storage = false; + struct bpf_local_storage *local_storage; + bool free_local_storage = false; - if (unlikely(!selem_linked_to_sk(selem))) + if (unlikely(!selem_linked_to_storage(selem))) /* selem has already been unlinked from sk */ return; - sk_storage = rcu_dereference(selem->sk_storage); - raw_spin_lock_bh(&sk_storage->lock); - if (likely(selem_linked_to_sk(selem))) - free_sk_storage = __selem_unlink_sk(sk_storage, selem, true); - raw_spin_unlock_bh(&sk_storage->lock); + local_storage = rcu_dereference(selem->local_storage); + raw_spin_lock_bh(&local_storage->lock); + if (likely(selem_linked_to_storage(selem))) + free_local_storage = + bpf_selem_unlink_storage(local_storage, selem, true); + raw_spin_unlock_bh(&local_storage->lock); - if (free_sk_storage) - kfree_rcu(sk_storage, rcu); + if (free_local_storage) + kfree_rcu(local_storage, rcu); } -static void __selem_link_sk(struct bpf_sk_storage *sk_storage, - struct bpf_sk_storage_elem *selem) +static void bpf_selem_link_storage(struct bpf_local_storage *local_storage, + struct bpf_local_storage_elem *selem) { - RCU_INIT_POINTER(selem->sk_storage, sk_storage); - hlist_add_head(&selem->snode, &sk_storage->list); + RCU_INIT_POINTER(selem->local_storage, local_storage); + hlist_add_head(&selem->snode, &local_storage->list); } -static void selem_unlink_map(struct bpf_sk_storage_elem *selem) +static void bpf_selem_unlink_map(struct bpf_local_storage_elem *selem) { - struct bpf_sk_storage_map *smap; - struct bucket *b; + struct bpf_local_storage_map *smap; + struct bpf_local_storage_map_bucket *b; if (unlikely(!selem_linked_to_map(selem))) /* selem has already be unlinked from smap */ @@ -238,10 +240,10 @@ static void selem_unlink_map(struct bpf_sk_storage_elem *selem) raw_spin_unlock_bh(&b->lock); } -static void selem_link_map(struct bpf_sk_storage_map *smap, - struct bpf_sk_storage_elem *selem) +static void bpf_selem_link_map(struct bpf_local_storage_map *smap, + struct bpf_local_storage_elem *selem) { - struct bucket *b = select_bucket(smap, selem); + struct bpf_local_storage_map_bucket *b = select_bucket(smap, selem); raw_spin_lock_bh(&b->lock); RCU_INIT_POINTER(SDATA(selem)->smap, smap); @@ -249,31 +251,31 @@ static void selem_link_map(struct bpf_sk_storage_map *smap, raw_spin_unlock_bh(&b->lock); } -static void selem_unlink(struct bpf_sk_storage_elem *selem) +static void bpf_selem_unlink(struct bpf_local_storage_elem *selem) { - /* Always unlink from map before unlinking from sk_storage + /* Always unlink from map before unlinking from local_storage * because selem will be freed after successfully unlinked from - * the sk_storage. + * the local_storage. */ - selem_unlink_map(selem); - selem_unlink_sk(selem); + bpf_selem_unlink_map(selem); + __bpf_selem_unlink_storage(selem); } -static struct bpf_sk_storage_data * -__sk_storage_lookup(struct bpf_sk_storage *sk_storage, - struct bpf_sk_storage_map *smap, - bool cacheit_lockit) +static struct bpf_local_storage_data * +bpf_local_storage_lookup(struct bpf_local_storage *local_storage, + struct bpf_local_storage_map *smap, + bool cacheit_lockit) { - struct bpf_sk_storage_data *sdata; - struct bpf_sk_storage_elem *selem; + struct bpf_local_storage_data *sdata; + struct bpf_local_storage_elem *selem; /* Fast path (cache hit) */ - sdata = rcu_dereference(sk_storage->cache[smap->cache_idx]); + sdata = rcu_dereference(local_storage->cache[smap->cache_idx]); if (sdata && rcu_access_pointer(sdata->smap) == smap) return sdata; /* Slow path (cache miss) */ - hlist_for_each_entry_rcu(selem, &sk_storage->list, snode) + hlist_for_each_entry_rcu(selem, &local_storage->list, snode) if (rcu_access_pointer(SDATA(selem)->smap) == smap) break; @@ -285,33 +287,33 @@ __sk_storage_lookup(struct bpf_sk_storage *sk_storage, /* spinlock is needed to avoid racing with the * parallel delete. Otherwise, publishing an already * deleted sdata to the cache will become a use-after-free - * problem in the next __sk_storage_lookup(). + * problem in the next bpf_local_storage_lookup(). */ - raw_spin_lock_bh(&sk_storage->lock); - if (selem_linked_to_sk(selem)) - rcu_assign_pointer(sk_storage->cache[smap->cache_idx], + raw_spin_lock_bh(&local_storage->lock); + if (selem_linked_to_storage(selem)) + rcu_assign_pointer(local_storage->cache[smap->cache_idx], sdata); - raw_spin_unlock_bh(&sk_storage->lock); + raw_spin_unlock_bh(&local_storage->lock); } return sdata; } -static struct bpf_sk_storage_data * +static struct bpf_local_storage_data * sk_storage_lookup(struct sock *sk, struct bpf_map *map, bool cacheit_lockit) { - struct bpf_sk_storage *sk_storage; - struct bpf_sk_storage_map *smap; + struct bpf_local_storage *sk_storage; + struct bpf_local_storage_map *smap; sk_storage = rcu_dereference(sk->sk_bpf_storage); if (!sk_storage) return NULL; - smap = (struct bpf_sk_storage_map *)map; - return __sk_storage_lookup(sk_storage, smap, cacheit_lockit); + smap = (struct bpf_local_storage_map *)map; + return bpf_local_storage_lookup(sk_storage, smap, cacheit_lockit); } -static int check_flags(const struct bpf_sk_storage_data *old_sdata, +static int check_flags(const struct bpf_local_storage_data *old_sdata, u64 map_flags) { if (old_sdata && (map_flags & ~BPF_F_LOCK) == BPF_NOEXIST) @@ -326,10 +328,10 @@ static int check_flags(const struct bpf_sk_storage_data *old_sdata, } static int sk_storage_alloc(struct sock *sk, - struct bpf_sk_storage_map *smap, - struct bpf_sk_storage_elem *first_selem) + struct bpf_local_storage_map *smap, + struct bpf_local_storage_elem *first_selem) { - struct bpf_sk_storage *prev_sk_storage, *sk_storage; + struct bpf_local_storage *prev_sk_storage, *sk_storage; int err; err = omem_charge(sk, sizeof(*sk_storage)); @@ -343,10 +345,10 @@ static int sk_storage_alloc(struct sock *sk, } INIT_HLIST_HEAD(&sk_storage->list); raw_spin_lock_init(&sk_storage->lock); - sk_storage->sk = sk; + sk_storage->owner = sk; - __selem_link_sk(sk_storage, first_selem); - selem_link_map(smap, first_selem); + bpf_selem_link_storage(sk_storage, first_selem); + bpf_selem_link_map(smap, first_selem); /* Publish sk_storage to sk. sk->sk_lock cannot be acquired. * Hence, atomic ops is used to set sk->sk_bpf_storage * from NULL to the newly allocated sk_storage ptr. @@ -356,10 +358,10 @@ static int sk_storage_alloc(struct sock *sk, * the sk->sk_bpf_storage, the sk_storage->lock must * be held before setting sk->sk_bpf_storage to NULL. */ - prev_sk_storage = cmpxchg((struct bpf_sk_storage **)&sk->sk_bpf_storage, + prev_sk_storage = cmpxchg((struct bpf_local_storage **)&sk->sk_bpf_storage, NULL, sk_storage); if (unlikely(prev_sk_storage)) { - selem_unlink_map(first_selem); + bpf_selem_unlink_map(first_selem); err = -EAGAIN; goto uncharge; @@ -386,15 +388,14 @@ static int sk_storage_alloc(struct sock *sk, * Otherwise, it will become a leak (and other memory issues * during map destruction). */ -static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk, - struct bpf_map *map, - void *value, - u64 map_flags) +static struct bpf_local_storage_data * +bpf_local_storage_update(struct sock *sk, struct bpf_map *map, void *value, + u64 map_flags) { - struct bpf_sk_storage_data *old_sdata = NULL; - struct bpf_sk_storage_elem *selem; - struct bpf_sk_storage *sk_storage; - struct bpf_sk_storage_map *smap; + struct bpf_local_storage_data *old_sdata = NULL; + struct bpf_local_storage_elem *selem; + struct bpf_local_storage *local_storage; + struct bpf_local_storage_map *smap; int err; /* BPF_EXIST and BPF_NOEXIST cannot be both set */ @@ -403,15 +404,15 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk, unlikely((map_flags & BPF_F_LOCK) && !map_value_has_spin_lock(map))) return ERR_PTR(-EINVAL); - smap = (struct bpf_sk_storage_map *)map; - sk_storage = rcu_dereference(sk->sk_bpf_storage); - if (!sk_storage || hlist_empty(&sk_storage->list)) { - /* Very first elem for this sk */ + smap = (struct bpf_local_storage_map *)map; + local_storage = rcu_dereference(sk->sk_bpf_storage); + if (!local_storage || hlist_empty(&local_storage->list)) { + /* Very first elem for this object */ err = check_flags(NULL, map_flags); if (err) return ERR_PTR(err); - selem = selem_alloc(smap, sk, value, true); + selem = bpf_selem_alloc(smap, sk, value, true); if (!selem) return ERR_PTR(-ENOMEM); @@ -427,25 +428,26 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk, if ((map_flags & BPF_F_LOCK) && !(map_flags & BPF_NOEXIST)) { /* Hoping to find an old_sdata to do inline update - * such that it can avoid taking the sk_storage->lock + * such that it can avoid taking the local_storage->lock * and changing the lists. */ - old_sdata = __sk_storage_lookup(sk_storage, smap, false); + old_sdata = + bpf_local_storage_lookup(local_storage, smap, false); err = check_flags(old_sdata, map_flags); if (err) return ERR_PTR(err); - if (old_sdata && selem_linked_to_sk(SELEM(old_sdata))) { + if (old_sdata && selem_linked_to_storage(SELEM(old_sdata))) { copy_map_value_locked(map, old_sdata->data, value, false); return old_sdata; } } - raw_spin_lock_bh(&sk_storage->lock); + raw_spin_lock_bh(&local_storage->lock); - /* Recheck sk_storage->list under sk_storage->lock */ - if (unlikely(hlist_empty(&sk_storage->list))) { - /* A parallel del is happening and sk_storage is going + /* Recheck local_storage->list under local_storage->lock */ + if (unlikely(hlist_empty(&local_storage->list))) { + /* A parallel del is happening and local_storage is going * away. It has just been checked before, so very * unlikely. Return instead of retry to keep things * simple. @@ -454,7 +456,7 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk, goto unlock_err; } - old_sdata = __sk_storage_lookup(sk_storage, smap, false); + old_sdata = bpf_local_storage_lookup(local_storage, smap, false); err = check_flags(old_sdata, map_flags); if (err) goto unlock_err; @@ -465,50 +467,51 @@ static struct bpf_sk_storage_data *sk_storage_update(struct sock *sk, goto unlock; } - /* sk_storage->lock is held. Hence, we are sure + /* local_storage->lock is held. Hence, we are sure * we can unlink and uncharge the old_sdata successfully * later. Hence, instead of charging the new selem now * and then uncharge the old selem later (which may cause * a potential but unnecessary charge failure), avoid taking * a charge at all here (the "!old_sdata" check) and the - * old_sdata will not be uncharged later during __selem_unlink_sk(). + * old_sdata will not be uncharged later during + * bpf_selem_unlink_storage(). */ - selem = selem_alloc(smap, sk, value, !old_sdata); + selem = bpf_selem_alloc(smap, sk, value, !old_sdata); if (!selem) { err = -ENOMEM; goto unlock_err; } /* First, link the new selem to the map */ - selem_link_map(smap, selem); + bpf_selem_link_map(smap, selem); - /* Second, link (and publish) the new selem to sk_storage */ - __selem_link_sk(sk_storage, selem); + /* Second, link (and publish) the new selem to local_storage */ + bpf_selem_link_storage(local_storage, selem); /* Third, remove old selem, SELEM(old_sdata) */ if (old_sdata) { - selem_unlink_map(SELEM(old_sdata)); - __selem_unlink_sk(sk_storage, SELEM(old_sdata), false); + bpf_selem_unlink_map(SELEM(old_sdata)); + bpf_selem_unlink_storage(local_storage, SELEM(old_sdata), false); } unlock: - raw_spin_unlock_bh(&sk_storage->lock); + raw_spin_unlock_bh(&local_storage->lock); return SDATA(selem); unlock_err: - raw_spin_unlock_bh(&sk_storage->lock); + raw_spin_unlock_bh(&local_storage->lock); return ERR_PTR(err); } static int sk_storage_delete(struct sock *sk, struct bpf_map *map) { - struct bpf_sk_storage_data *sdata; + struct bpf_local_storage_data *sdata; sdata = sk_storage_lookup(sk, map, false); if (!sdata) return -ENOENT; - selem_unlink(SELEM(sdata)); + bpf_selem_unlink(SELEM(sdata)); return 0; } @@ -520,7 +523,7 @@ static u16 cache_idx_get(void) spin_lock(&cache_idx_lock); - for (i = 0; i < BPF_SK_STORAGE_CACHE_SIZE; i++) { + for (i = 0; i < BPF_LOCAL_STORAGE_CACHE_SIZE; i++) { if (cache_idx_usage_counts[i] < min_usage) { min_usage = cache_idx_usage_counts[i]; res = i; @@ -547,8 +550,8 @@ static void cache_idx_free(u16 idx) /* Called by __sk_destruct() & bpf_sk_storage_clone() */ void bpf_sk_storage_free(struct sock *sk) { - struct bpf_sk_storage_elem *selem; - struct bpf_sk_storage *sk_storage; + struct bpf_local_storage_elem *selem; + struct bpf_local_storage *sk_storage; bool free_sk_storage = false; struct hlist_node *n; @@ -573,8 +576,9 @@ void bpf_sk_storage_free(struct sock *sk) /* Always unlink from map before unlinking from * sk_storage. */ - selem_unlink_map(selem); - free_sk_storage = __selem_unlink_sk(sk_storage, selem, true); + bpf_selem_unlink_map(selem); + free_sk_storage = + bpf_selem_unlink_storage(sk_storage, selem, true); } raw_spin_unlock_bh(&sk_storage->lock); rcu_read_unlock(); @@ -583,14 +587,14 @@ void bpf_sk_storage_free(struct sock *sk) kfree_rcu(sk_storage, rcu); } -static void bpf_sk_storage_map_free(struct bpf_map *map) +static void bpf_local_storage_map_free(struct bpf_map *map) { - struct bpf_sk_storage_elem *selem; - struct bpf_sk_storage_map *smap; - struct bucket *b; + struct bpf_local_storage_elem *selem; + struct bpf_local_storage_map *smap; + struct bpf_local_storage_map_bucket *b; unsigned int i; - smap = (struct bpf_sk_storage_map *)map; + smap = (struct bpf_local_storage_map *)map; cache_idx_free(smap->cache_idx); @@ -614,10 +618,10 @@ static void bpf_sk_storage_map_free(struct bpf_map *map) rcu_read_lock(); /* No one is adding to b->list now */ - while ((selem = hlist_entry_safe(rcu_dereference_raw(hlist_first_rcu(&b->list)), - struct bpf_sk_storage_elem, - map_node))) { - selem_unlink(selem); + while ((selem = hlist_entry_safe( + rcu_dereference_raw(hlist_first_rcu(&b->list)), + struct bpf_local_storage_elem, map_node))) { + bpf_selem_unlink(selem); cond_resched_rcu(); } rcu_read_unlock(); @@ -630,7 +634,7 @@ static void bpf_sk_storage_map_free(struct bpf_map *map) * * However, the bpf_sk_storage_free() still needs to access * the smap->elem_size to do the uncharging in - * __selem_unlink_sk(). + * bpf_selem_unlink_storage(). * * Hence, wait another rcu grace period for the * bpf_sk_storage_free() to finish. @@ -644,14 +648,15 @@ static void bpf_sk_storage_map_free(struct bpf_map *map) /* U16_MAX is much more than enough for sk local storage * considering a tcp_sock is ~2k. */ -#define MAX_VALUE_SIZE \ +#define BPF_LOCAL_STORAGE_MAX_VALUE_SIZE \ min_t(u32, \ - (KMALLOC_MAX_SIZE - MAX_BPF_STACK - sizeof(struct bpf_sk_storage_elem)), \ - (U16_MAX - sizeof(struct bpf_sk_storage_elem))) + (KMALLOC_MAX_SIZE - MAX_BPF_STACK - \ + sizeof(struct bpf_local_storage_elem)), \ + (U16_MAX - sizeof(struct bpf_local_storage_elem))) static int bpf_sk_storage_map_alloc_check(union bpf_attr *attr) { - if (attr->map_flags & ~SK_STORAGE_CREATE_FLAG_MASK || + if (attr->map_flags & ~BPF_LOCAL_STORAGE_CREATE_FLAG_MASK || !(attr->map_flags & BPF_F_NO_PREALLOC) || attr->max_entries || attr->key_size != sizeof(int) || !attr->value_size || @@ -662,15 +667,15 @@ static int bpf_sk_storage_map_alloc_check(union bpf_attr *attr) if (!bpf_capable()) return -EPERM; - if (attr->value_size > MAX_VALUE_SIZE) + if (attr->value_size > BPF_LOCAL_STORAGE_MAX_VALUE_SIZE) return -E2BIG; return 0; } -static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr) +static struct bpf_map *bpf_local_storage_map_alloc(union bpf_attr *attr) { - struct bpf_sk_storage_map *smap; + struct bpf_local_storage_map *smap; unsigned int i; u32 nbuckets; u64 cost; @@ -706,7 +711,7 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr) raw_spin_lock_init(&smap->buckets[i].lock); } - smap->elem_size = sizeof(struct bpf_sk_storage_elem) + attr->value_size; + smap->elem_size = sizeof(struct bpf_local_storage_elem) + attr->value_size; smap->cache_idx = cache_idx_get(); return &smap->map; @@ -737,7 +742,7 @@ static int bpf_sk_storage_map_check_btf(const struct bpf_map *map, static void *bpf_fd_sk_storage_lookup_elem(struct bpf_map *map, void *key) { - struct bpf_sk_storage_data *sdata; + struct bpf_local_storage_data *sdata; struct socket *sock; int fd, err; @@ -755,14 +760,15 @@ static void *bpf_fd_sk_storage_lookup_elem(struct bpf_map *map, void *key) static int bpf_fd_sk_storage_update_elem(struct bpf_map *map, void *key, void *value, u64 map_flags) { - struct bpf_sk_storage_data *sdata; + struct bpf_local_storage_data *sdata; struct socket *sock; int fd, err; fd = *(int *)key; sock = sockfd_lookup(fd, &err); if (sock) { - sdata = sk_storage_update(sock->sk, map, value, map_flags); + sdata = bpf_local_storage_update(sock->sk, map, value, + map_flags); sockfd_put(sock); return PTR_ERR_OR_ZERO(sdata); } @@ -786,14 +792,14 @@ static int bpf_fd_sk_storage_delete_elem(struct bpf_map *map, void *key) return err; } -static struct bpf_sk_storage_elem * +static struct bpf_local_storage_elem * bpf_sk_storage_clone_elem(struct sock *newsk, - struct bpf_sk_storage_map *smap, - struct bpf_sk_storage_elem *selem) + struct bpf_local_storage_map *smap, + struct bpf_local_storage_elem *selem) { - struct bpf_sk_storage_elem *copy_selem; + struct bpf_local_storage_elem *copy_selem; - copy_selem = selem_alloc(smap, newsk, NULL, true); + copy_selem = bpf_selem_alloc(smap, newsk, NULL, true); if (!copy_selem) return NULL; @@ -809,9 +815,9 @@ bpf_sk_storage_clone_elem(struct sock *newsk, int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk) { - struct bpf_sk_storage *new_sk_storage = NULL; - struct bpf_sk_storage *sk_storage; - struct bpf_sk_storage_elem *selem; + struct bpf_local_storage *new_sk_storage = NULL; + struct bpf_local_storage *sk_storage; + struct bpf_local_storage_elem *selem; int ret = 0; RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL); @@ -823,8 +829,8 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk) goto out; hlist_for_each_entry_rcu(selem, &sk_storage->list, snode) { - struct bpf_sk_storage_elem *copy_selem; - struct bpf_sk_storage_map *smap; + struct bpf_local_storage_elem *copy_selem; + struct bpf_local_storage_map *smap; struct bpf_map *map; smap = rcu_dereference(SDATA(selem)->smap); @@ -848,8 +854,8 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk) } if (new_sk_storage) { - selem_link_map(smap, copy_selem); - __selem_link_sk(new_sk_storage, copy_selem); + bpf_selem_link_map(smap, copy_selem); + bpf_selem_link_storage(new_sk_storage, copy_selem); } else { ret = sk_storage_alloc(newsk, smap, copy_selem); if (ret) { @@ -860,7 +866,8 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk) goto out; } - new_sk_storage = rcu_dereference(copy_selem->sk_storage); + new_sk_storage = + rcu_dereference(copy_selem->local_storage); } bpf_map_put(map); } @@ -878,7 +885,7 @@ int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk) BPF_CALL_4(bpf_sk_storage_get, struct bpf_map *, map, struct sock *, sk, void *, value, u64, flags) { - struct bpf_sk_storage_data *sdata; + struct bpf_local_storage_data *sdata; if (flags > BPF_SK_STORAGE_GET_F_CREATE) return (unsigned long)NULL; @@ -894,7 +901,7 @@ BPF_CALL_4(bpf_sk_storage_get, struct bpf_map *, map, struct sock *, sk, * destruction). */ refcount_inc_not_zero(&sk->sk_refcnt)) { - sdata = sk_storage_update(sk, map, value, BPF_NOEXIST); + sdata = bpf_local_storage_update(sk, map, value, BPF_NOEXIST); /* sk must be a fullsock (guaranteed by verifier), * so sock_gen_put() is unnecessary. */ @@ -922,14 +929,14 @@ BPF_CALL_2(bpf_sk_storage_delete, struct bpf_map *, map, struct sock *, sk) static int sk_storage_map_btf_id; const struct bpf_map_ops sk_storage_map_ops = { .map_alloc_check = bpf_sk_storage_map_alloc_check, - .map_alloc = bpf_sk_storage_map_alloc, - .map_free = bpf_sk_storage_map_free, + .map_alloc = bpf_local_storage_map_alloc, + .map_free = bpf_local_storage_map_free, .map_get_next_key = notsupp_get_next_key, .map_lookup_elem = bpf_fd_sk_storage_lookup_elem, .map_update_elem = bpf_fd_sk_storage_update_elem, .map_delete_elem = bpf_fd_sk_storage_delete_elem, .map_check_btf = bpf_sk_storage_map_check_btf, - .map_btf_name = "bpf_sk_storage_map", + .map_btf_name = "bpf_local_storage_map", .map_btf_id = &sk_storage_map_btf_id, }; @@ -1011,7 +1018,7 @@ bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs) u32 nr_maps = 0; int rem, err; - /* bpf_sk_storage_map is currently limited to CAP_SYS_ADMIN as + /* bpf_local_storage_map is currently limited to CAP_SYS_ADMIN as * the map_alloc_check() side also does. */ if (!bpf_capable()) @@ -1061,13 +1068,13 @@ bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs) } EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_alloc); -static int diag_get(struct bpf_sk_storage_data *sdata, struct sk_buff *skb) +static int diag_get(struct bpf_local_storage_data *sdata, struct sk_buff *skb) { struct nlattr *nla_stg, *nla_value; - struct bpf_sk_storage_map *smap; + struct bpf_local_storage_map *smap; /* It cannot exceed max nlattr's payload */ - BUILD_BUG_ON(U16_MAX - NLA_HDRLEN < MAX_VALUE_SIZE); + BUILD_BUG_ON(U16_MAX - NLA_HDRLEN < BPF_LOCAL_STORAGE_MAX_VALUE_SIZE); nla_stg = nla_nest_start(skb, SK_DIAG_BPF_STORAGE); if (!nla_stg) @@ -1103,9 +1110,9 @@ static int bpf_sk_storage_diag_put_all(struct sock *sk, struct sk_buff *skb, { /* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */ unsigned int diag_size = nla_total_size(0); - struct bpf_sk_storage *sk_storage; - struct bpf_sk_storage_elem *selem; - struct bpf_sk_storage_map *smap; + struct bpf_local_storage *sk_storage; + struct bpf_local_storage_elem *selem; + struct bpf_local_storage_map *smap; struct nlattr *nla_stgs; unsigned int saved_len; int err = 0; @@ -1158,8 +1165,8 @@ int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag, { /* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */ unsigned int diag_size = nla_total_size(0); - struct bpf_sk_storage *sk_storage; - struct bpf_sk_storage_data *sdata; + struct bpf_local_storage *sk_storage; + struct bpf_local_storage_data *sdata; struct nlattr *nla_stgs; unsigned int saved_len; int err = 0; @@ -1186,8 +1193,8 @@ int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag, saved_len = skb->len; for (i = 0; i < diag->nr_maps; i++) { - sdata = __sk_storage_lookup(sk_storage, - (struct bpf_sk_storage_map *)diag->maps[i], + sdata = bpf_local_storage_lookup(sk_storage, + (struct bpf_local_storage_map *)diag->maps[i], false); if (!sdata)