From patchwork Thu Dec 19 15:46:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthieu Baerts \(NGI0\)" X-Patchwork-Id: 852637 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A8D3F226552; Thu, 19 Dec 2024 15:50:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734623417; cv=none; b=brMNocpb6zozY9IxFkSkTCk5mPVj/EIlu3E7HF4VwjiCP/+4jgwxQ9LpuCS16OFbHpJVj+8Xi9oMjheRJgHUqzIeflvayWYE+ZlPK0TE6XDAMvVlhrbcVJMq2U/IW3rL2TprvXCS7EGCUxNbJj/nvP4IIeiSixA1In4MzWYrLwU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734623417; c=relaxed/simple; bh=uSOupaSl0R2bP+tGvViCkeLrCZOlUFfU6pCZQqCqeKA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=fIoF/tFrtwUHXhoaoZuirCMYU/aZN4dJVzOoj0kiToStbtFESy3b7UCNaD1aVQpq1p5ZU8WNxaOKwk0MusfPpbJqq3JFjyLGq2L/7pGt/6kFTIz+euuIBrQBBQp6XVv3ucPDwqrT0CcqZgWwYdMGKmQIyouVlBRcLaicWLobacs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qBQInViE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qBQInViE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A4A2C4CEE1; Thu, 19 Dec 2024 15:50:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734623417; bh=uSOupaSl0R2bP+tGvViCkeLrCZOlUFfU6pCZQqCqeKA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=qBQInViE3X3MrBuNQTZ0fawJH+eTIscHj4mTNPkqJqMDpkthDT9cMiHJichU/81iS OteNVeV1YeEgjxKxnmRgR+m5GHu4dTJngRyb+j9aJDMjmMdRUn07tmTda/ZcSUz3IP ibZfy9hoh4PUlI+PYdu1QDyBBq5TKX95H51RT/tGA3EUxQjzbzM2EyJxbOdZ2bKFxQ kvBvnr2mtz9Bnhzc07ynV17FTtxW0rUXFfIEhjuSzQJ/eJPfih28ljWOcHu9XVIw6P kzvN3xBZWrWVMytHl18vUYs3twUVwl3/SYCp22o+NYCrYIdyfGkxoiycCaQMrv9ujx 8hPGDDdWxtSmQ== From: "Matthieu Baerts (NGI0)" Date: Thu, 19 Dec 2024 16:46:40 +0100 Subject: [PATCH bpf-next/net v2 1/7] bpf: Extend bpf_skc_to_mptcp_sock to MPTCP sock Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241219-bpf-next-net-mptcp-bpf_iter-subflows-v2-1-ae244d3cdbbc@kernel.org> References: <20241219-bpf-next-net-mptcp-bpf_iter-subflows-v2-0-ae244d3cdbbc@kernel.org> In-Reply-To: <20241219-bpf-next-net-mptcp-bpf_iter-subflows-v2-0-ae244d3cdbbc@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, "Matthieu Baerts (NGI0)" , Geliang Tang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3112; i=matttbe@kernel.org; h=from:subject:message-id; bh=lnryqshajbYUd9cCgDiyIBOFzeb7Ox7Vw7A9hLDDvHY=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBnZECtu/pzH08fKosSsCBeA/bO7d2/QiJaRXxhB BAAKUCg+U2JAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZ2RArQAKCRD2t4JPQmmg cyReEAC0BjYOvTnlmA+RuJIdOqEBdGShz7oSfVgeHZgeoS9NEDaAt50uuVuNvOhNBoCp78WV6B6 8+T6yLk3EXmYmiX7cAkAwqofnTePZ3PhbNNTrXx4AiBZcBkbjsMfGG8dPsKCAKTjj60vJI1GURL GtIkusE6YPni4VQlWrnlkLWiDtsSvx7jvaKZ/DSvyOCZNBUeklzfpqGKTNbzSvWX1mQ3Dj4sfaG ZMTywh5qpnxj96WHfj1ax2E+/xOijw6AJZSDrAKU02qxBcJVYJHaqJtr3u7Odhwce/NxAVpxioC QAgAJMdEwTgZCTMMXO7Epo4z+2bMKpiprsbk0lyFpc0M1NEnsCoLDysD4vnnvvhMno48cDulusp +570GUwrZuGUgJHjQkysfDWTpb60BPIahbZVK/NDST5/1gpvN4QpZcMaeJIcsHvN0wlFcR/M35I ZTue6+cpPAOkGHBedToehoVCk9AvCXqzWPEZYgAOU/ZhBKRtn9rVC5QntwsiM91llJzmFoCoqRR Il5d9bSe0V8WA2JLS9AkfKXnNTXKXYuC6XGTy84uMTBmt0FVkZwsyzIKDHL/eauELfsVfNnF7Pk S0r/KQhbrUYmDLM4U3sAfuybeOWfK9f5AFoUIIHiJXGegqmtXBk7G1h3l6W2NFosh2X6hW0YhDI ygFZCx+xjTaiWdQ== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Geliang Tang Currently, bpf_skc_to_mptcp_sock() can only be used with sockets that are MPTCP subflows: TCP sockets with tp->is_mptcp, created by the kernel from an MPTCP socket (IPPROTO_MPTCP). Typically used with BPF sock_ops operators. Here, this helper is extended to support MPTCP sockets, the ones created by the userspace (IPPROTO_MPTCP). This is useful for BPF hooks involving these sockets, e.g. [gs]etsocktopt. bpf_skc_to_mptcp_sock() uses bpf_mptcp_sock_from_subflow(). The former suggests any MPTCP type/subtype can be used, but the latter only accepts subflow ones. So bpf_mptcp_sock_from_subflow is modified here to support MPTCP socket, and renamed to avoid confusions. Signed-off-by: Geliang Tang Reviewed-by: Matthieu Baerts (NGI0) Signed-off-by: Matthieu Baerts (NGI0) --- Notes: - v2: new patch. --- include/net/mptcp.h | 4 ++-- net/core/filter.c | 2 +- net/mptcp/bpf.c | 10 ++++++++-- 3 files changed, 11 insertions(+), 5 deletions(-) diff --git a/include/net/mptcp.h b/include/net/mptcp.h index 814b5f2e3ed5e3e474a2bac5e4cca5a89abcfe1c..94d5976f7b8d8eb8b82f298f7b33ecd653937dc0 100644 --- a/include/net/mptcp.h +++ b/include/net/mptcp.h @@ -322,9 +322,9 @@ static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { } #endif #if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_SYSCALL) -struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk); +struct mptcp_sock *bpf_mptcp_sock_from_sock(struct sock *sk); #else -static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; } +static inline struct mptcp_sock *bpf_mptcp_sock_from_sock(struct sock *sk) { return NULL; } #endif #if !IS_ENABLED(CONFIG_MPTCP) diff --git a/net/core/filter.c b/net/core/filter.c index 6625b3f563a4a3110a76b9c12a46340828e16b6e..40ed3854a899bf9d11847ec0e8aee174923f03d2 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -11833,7 +11833,7 @@ const struct bpf_func_proto bpf_skc_to_unix_sock_proto = { BPF_CALL_1(bpf_skc_to_mptcp_sock, struct sock *, sk) { BTF_TYPE_EMIT(struct mptcp_sock); - return (unsigned long)bpf_mptcp_sock_from_subflow(sk); + return (unsigned long)bpf_mptcp_sock_from_sock(sk); } const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto = { diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c index 8a16672b94e2384f5263e1432296cbca1236bb30..988b22a06331ac293b36f3c6f9bc29ff0f6db048 100644 --- a/net/mptcp/bpf.c +++ b/net/mptcp/bpf.c @@ -12,9 +12,15 @@ #include #include "protocol.h" -struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) +struct mptcp_sock *bpf_mptcp_sock_from_sock(struct sock *sk) { - if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk)) + if (unlikely(!sk || !sk_fullsock(sk))) + return NULL; + + if (sk->sk_protocol == IPPROTO_MPTCP) + return mptcp_sk(sk); + + if (sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk)) return mptcp_sk(mptcp_subflow_ctx(sk)->conn); return NULL;