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Mon, 26 Oct 2026 12:03:50 -0700 (PDT) Received: from mtardy-friendly-lvh-runner.europe-west1-c.c.cilium-dev.internal ([2600:1900:4010:1a8::]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-48e3ecd37f4sm21145713f8f.44.2026.10.26.12.03.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Oct 2026 12:03:50 -0700 (PDT) From: Mahe Tardy To: bpf@vger.kernel.org Cc: andrii@kernel.org, ast@kernel.org, daniel@iogearbox.net, davem@davemloft.net, willemb@google.com, eddyz87@gmail.com, edumazet@google.com, john.fastabend@gmail.com, kuba@kernel.org, horms@kernel.org, liamwisehart@meta.com, martin.lau@linux.dev, pabeni@redhat.com, song@kernel.org, netdev@vger.kernel.org, sdf.kernel@gmail.com, yonghong.song@linux.dev, jolsa@kernel.org, kuniyu@google.com, memxor@gmail.com, emil@etsalapatis.com, almagui@kernel.org, Mahe Tardy Subject: [PATCH bpf-next v2 1/2] bpf: Add bpf_ksock_bind() kfunc Date: Mon, 26 Oct 2026 19:03:41 +0000 Message-ID: <20261026190342.137069-1-mahe.tardy@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Part of the effort to make ksock have all basic socket operations. This is for example useful when replying to a peer which expects a message from a particular source port. Signed-off-by: Mahe Tardy --- net/core/bpf_ksock.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/net/core/bpf_ksock.c b/net/core/bpf_ksock.c index 37168f43c16c..25111712b944 100644 --- a/net/core/bpf_ksock.c +++ b/net/core/bpf_ksock.c @@ -178,6 +178,37 @@ bpf_ksock_create(const struct bpf_ksock_create_opts *opts, u32 opts__sz, return NULL; } +/** + * bpf_ksock_bind() - Bind a BPF kernel socket to a local address. + * @ks: The BPF kernel socket context. + * @addr: Pointer to an IPv4 or IPv6 socket address. + * @addr__sz: Size of the address union. + * + * Binds the socket to the specified local address and port. A port of zero + * selects an ephemeral port. + * + * This function may sleep, so it can only be used in sleepable BPF programs + * (SYSCALL). + * + * Return: 0 on success, negative errno on error. + */ +__bpf_kfunc int bpf_ksock_bind(struct bpf_ksock *ks, + const union bpf_ksock_addr *addr, u32 addr__sz) +{ + struct sockaddr_storage sa; + int addrlen; + + /* Prevent wq kthread context for CAP_NET_BIND_SERVICE check */ + if (current->flags & PF_KTHREAD) + return -EOPNOTSUPP; + + addrlen = bpf_ksock_addr_to_sockaddr(addr, addr__sz, &sa); + if (addrlen < 0) + return addrlen; + + return __sys_bind_socket(ks->sock, &sa, addrlen); +} + /** * bpf_ksock_connect() - Connect a BPF kernel socket to a remote address. * @ks: The BPF kernel socket context. @@ -285,6 +316,7 @@ __bpf_kfunc_end_defs(); BTF_KFUNCS_START(ksock_init_kfunc_btf_ids) BTF_ID_FLAGS(func, bpf_ksock_create, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE) BTF_ID_FLAGS(func, bpf_ksock_connect, KF_SLEEPABLE) +BTF_ID_FLAGS(func, bpf_ksock_bind, KF_SLEEPABLE) BTF_KFUNCS_END(ksock_init_kfunc_btf_ids) static const struct btf_kfunc_id_set ksock_init_kfunc_set = { -- 2.43.0