From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.221.51 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792692995; b=2aXvBCW6qqYOz2ZCKFui0YM7lElqSgFzje+YjbGxSabSaP6Ilanz7z/3fhTOi9P/+8FG asO8F1dxPmFioznBZrOH6I1g0OY/LENQwceVECIyKuSRM4+NVHYqRPnnD3c1MThLT5EF2 o8KHFqzP9AN3bXjWzDu5tu0WhsAkhoQl/WpxVKUSurwHJT00lRHujRHPsGD6ijmw5ZXtT 4zD833e789LB9Viu7U/Ljdi+5RdcSHDHiEyf42MErivyrH8frAVkoJva8k+fvO70bCmHE OeUJ2p9HrLfIrg30vHKu30gAVe+GZL+UeZnDwA1DvRPTbbSvoK6nuaxkVxwc7ZUAVZA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792692995; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Gm-Message-State:X-Gm-Gg:X-Received:Received:From:To:Cc:Subject: Date:Message-ID:X-Mailer:MIME-Version:Content-Transfer-Encoding; bh=QeAE/97LSA+alBszF2d/9US4us/V4a2d1RN7juhfoM8=; b=lxRx71ev37ao1rRr3Fw6bbtxC2TqppEdP5zIbFl4VEgAnnN8rQ8yRSm/AI/zPhCJInfe PN7mT3czPO+edS/5OTx6tSVnGxNFCiTaVkzvcMKPCw++DGVhUh850J3wJGgjkk5b2yonC CCR5P/QbCy4QQoe2PfGJVO53nlZsAjNpDKXXgAlsuOIIYH0xPWxMT58vYIfrmqekOPHAP sAAVfWuFayXIyuJEqQWFsgMWIsxeX6oK7dhrqHTsxHw5Iy5AwCGa8cqKvNnvpluVxQMNx ++NEjG2w+I3NU+4IiyuCPNkkwBTwkAbAGY72GwsQlSLAZ92/jwa6n2F1Kmei7FI1AQw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20251104 header.b="YKhRC3q/"; arc=none smtp.remote-ip=209.85.221.51 Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com [209.85.221.51]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C8977606A31A for ; Thu, 22 Oct 2026 18:16:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org C8977606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20251104 header.b=YKhRC3q/ Received: by mail-wr1-f51.google.com with SMTP id ffacd0b85a97d-48c4649b35bso82246f8f.3 for ; Thu, 22 Oct 2026 11:16:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1792692993; x=1793297793; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=QeAE/97LSA+alBszF2d/9US4us/V4a2d1RN7juhfoM8=; b=YKhRC3q/p2rLW80Q2JhcknkVIWplOdKZw10QYqUbrLJ//XuZVCmBH4rm6MChmHL+Ju X8jWc+nftxbKSDqEUP4esKdNDIF18cTPUCkTqv9S1agUql2ky1HVZ4bQSqr+lfMRz4F1 nh5YIE9aQ6hAw+yC23fOq70aHFhGCfWR8wYenT2iZ5w0H7iicikHpCqgo8ivOIvROOwE sE4OZ0D7D/5YhqYaJs0jeVjZQH0eGY9Ay5a+RDrnWGtmL/NkI6bhYgL8WFYyr/7JkWr1 o1zMi7DrDje01CXwjtLLZqDlwHzuLLbOZwOqx79fByblZs5+rDxr6IwUsg9vTFsNuZX2 Incw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792692993; x=1793297793; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=QeAE/97LSA+alBszF2d/9US4us/V4a2d1RN7juhfoM8=; b=XMIHdhC6geOWNZGGYEVC2XdYDHyq3+LZKTrDM+2d38Hfjz08IE8+APHu9GnlSQN2mw llJLJOG9gdba78z78rVrGkUsr/FUMGDCp+igzp7tUhFE3r1PVE/u8otmRu0woQg1w/ES pP8jroG/jng/tJzrcjn+NsfrvVcpKgTpw5v0J7YQC61Oa4Bzsd/xJGCVJ83WjUGKp90X P1mRXklFK3160nCHlrRDoUHMd8MPCq477sKRs0iUFBJhmfzfnZpHCENPe9WiY6f7+YoN 4RJbkg/FSGQzOOT5t1GQfkK2nYzyJ4eRgDiYKHhbemH2c6e4skeYD9qLN0wNKwRIxYCy luUQ== X-Gm-Message-State: AFq9FYIm93w6qadKq2HAe965l+LvuNztN5gvgjFm+o2IGzd0xOjQWZ1r E8LXE0wFy9KQdbKN7KCn2Yu8X4jtRJuGKFTEt7mc4Rja8QgTMF8+eDCquUQDDd1NEKAfyA== X-Gm-Gg: AYBFou3StOKgClgggOOsxUWrYUpfIazEqU3Zk1T3wSC0F8ICL6b5b7CcFNRk/fYwzBu epW76ol2tHJMOv/gesMlMCBKVcBcQrZf4keNb1nm6ozthpnQpUITeNP9PCfO0xuj2Hp8B9d8oRe Brd8T8WyZsJhFzt1r6xPCvvWlilUu8/Z8Dd1qEbIUbHLE+puxnjAeeRNv4NCtlZ48XLjH+Ep8ho 8aXzBFb/eKDr0ojmsuJdF8ISATjSKReDp/1XgS4FQTd1nHKTDI/F0+8x3qdt5fPUZ87c044HNaR aKIuNRXveMt/dsDjZflJF1gPgW6FGhU+svGwS/2TjyYYj73JAejH5/k6TBOKpOHl8YMQ0ZNqJOZ An5U1wS4fHCOHprBaJlkda1kdVI2Yq5ivhJM/JZzOvhWWrwbDasROQZ+24uUzMpIvH0x+t1nCjy E/KztdFi/gkfxrTrRnGwzsUQqQFo3eGVggG7yHoQGvGTe02KIGIhD67gzDu+Zq8C4bKNdzC+Irn ksg38S4sowaHLLnexOiE3zERv3UEQtpcMBWSoI5wejmz4BrlsKelc2Ep29HpO6nVVs42/wh8zvj BdiGnnbareXNDMYZPoziWyZII3VyIeWLNbYAdVtkXfmfyRp/ X-Received: by 2002:a05:6000:240c:b0:48b:f92:1f67 with SMTP id ffacd0b85a97d-48e264898b6mr12509309f8f.21.1792692992923; Thu, 22 Oct 2026 11:16:32 -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-48e3796b2b4sm18451f8f.7.2026.10.22.11.16.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 22 Oct 2026 11:16:32 -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 1/2] bpf: Add bpf_ksock_bind() kfunc Date: Thu, 22 Oct 2026 18:16:19 +0000 Message-ID: <20261022181620.247201-1-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 | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/net/core/bpf_ksock.c b/net/core/bpf_ksock.c index 37168f43c16c..c7b487d90cd0 100644 --- a/net/core/bpf_ksock.c +++ b/net/core/bpf_ksock.c @@ -178,6 +178,33 @@ 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; + + 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 +312,7 @@ __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