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[2001:8b0:7a5a:26ff:60d6:619e:3324:40dc]) by smtp.gmail.com with ESMTPSA id 3sm4204565wms.36.2020.08.19.02.37.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Aug 2020 02:37:48 -0700 (PDT) From: Lorenz Bauer To: jakub@cloudflare.com, john.fastabend@gmail.com, Alexei Starovoitov , Daniel Borkmann , Lorenz Bauer , "David S. Miller" , Jakub Kicinski Cc: kernel-team@cloudflare.com, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next 3/6] bpf: sockmap: call sock_map_update_elem directly Date: Wed, 19 Aug 2020 10:24:33 +0100 Message-Id: <20200819092436.58232-4-lmb@cloudflare.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200819092436.58232-1-lmb@cloudflare.com> References: <20200819092436.58232-1-lmb@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Don't go via map->ops to call sock_map_update_elem, since we know what function to call in bpf_map_update_value. Since check_map_func_compatibility doesn't allow calling BPF_FUNC_map_update_elem from BPF context, we can remove ops->map_update_elem and rename the function to sock_map_update_elem_sys. Signed-off-by: Lorenz Bauer --- include/linux/bpf.h | 7 +++++++ kernel/bpf/syscall.c | 5 +++-- net/core/sock_map.c | 6 ++---- 3 files changed, 12 insertions(+), 6 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index cef4ef0d2b4e..cf3416d1b8c2 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1635,6 +1635,7 @@ int sock_map_prog_update(struct bpf_map *map, struct bpf_prog *prog, struct bpf_prog *old, u32 which); int sock_map_get_from_fd(const union bpf_attr *attr, struct bpf_prog *prog); int sock_map_prog_detach(const union bpf_attr *attr, enum bpf_prog_type ptype); +int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, u64 flags); void sock_map_unhash(struct sock *sk); void sock_map_close(struct sock *sk, long timeout); #else @@ -1656,6 +1657,12 @@ static inline int sock_map_prog_detach(const union bpf_attr *attr, { return -EOPNOTSUPP; } + +static inline int sock_map_update_elem_sys(struct bpf_map *map, void *key, void *value, + u64 flags) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_BPF_STREAM_PARSER */ #if defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 2f343ce15747..5867cf615a3c 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -157,10 +157,11 @@ static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key, if (bpf_map_is_dev_bound(map)) { return bpf_map_offload_update_elem(map, key, value, flags); } else if (map->map_type == BPF_MAP_TYPE_CPUMAP || - map->map_type == BPF_MAP_TYPE_SOCKHASH || - map->map_type == BPF_MAP_TYPE_SOCKMAP || map->map_type == BPF_MAP_TYPE_STRUCT_OPS) { return map->ops->map_update_elem(map, key, value, flags); + } else if (map->map_type == BPF_MAP_TYPE_SOCKHASH || + map->map_type == BPF_MAP_TYPE_SOCKMAP) { + return sock_map_update_elem_sys(map, key, value, flags); } else if (IS_FD_PROG_ARRAY(map)) { return bpf_fd_array_map_update_elem(map, f.file, key, value, flags); diff --git a/net/core/sock_map.c b/net/core/sock_map.c index f464a0ebc871..018367fb889f 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -562,8 +562,8 @@ static bool sock_map_sk_state_allowed(const struct sock *sk) static int sock_hash_update_common(struct bpf_map *map, void *key, struct sock *sk, u64 flags); -int sock_map_update_elem(struct bpf_map *map, void *key, - void *value, u64 flags) +int sock_map_update_elem_sys(struct bpf_map *map, void *key, + void *value, u64 flags) { struct socket *sock; struct sock *sk; @@ -687,7 +687,6 @@ const struct bpf_map_ops sock_map_ops = { .map_free = sock_map_free, .map_get_next_key = sock_map_get_next_key, .map_lookup_elem_sys_only = sock_map_lookup_sys, - .map_update_elem = sock_map_update_elem, .map_delete_elem = sock_map_delete_elem, .map_lookup_elem = sock_map_lookup, .map_release_uref = sock_map_release_progs, @@ -1181,7 +1180,6 @@ const struct bpf_map_ops sock_hash_ops = { .map_alloc = sock_hash_alloc, .map_free = sock_hash_free, .map_get_next_key = sock_hash_get_next_key, - .map_update_elem = sock_map_update_elem, .map_delete_elem = sock_hash_delete_elem, .map_lookup_elem = sock_hash_lookup, .map_lookup_elem_sys_only = sock_hash_lookup_sys, -- 2.25.1