From patchwork Fri Nov 8 15:52:32 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: 13868392 X-Patchwork-Delegate: geliang@kernel.org 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 76FC121B452; Fri, 8 Nov 2024 15:52:57 +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=1731081177; cv=none; b=DqQcU3ksKdiZYgDN7bMoT0FGbqu6+if/PybSCqvaU4WXng8sckzNdVsujzdYXN4xgsFubT9Xc86PnoYRRWThd+KZDugg5TGc06YjWNPJYIkM4irlIB8vGDANdDs5FWEZUgkOuh1h/J+cMo8P9xDW3TI23hp8VSWbEOPJfoJKfco= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731081177; c=relaxed/simple; bh=RF/R77yecZxwwcV/SQ7kt2sEMgzQozbeyKh2oAd6g0E=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=eBEzRf+MasinqUxz5DE27GAoMuzWhmXgjRGuMq2CyDPOnqRcmCxbw9CAPKBmSfexjZeejkvPGkJgdwJPfkF/dRHOZ6mPPNzMa0SH+KyXwfSWuhkxeSZzz5BESKflYLsNyrAC7O//62i25PglItpE9gEWkPHmH+aeXif+LJEe+RU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kAuz11Lm; 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="kAuz11Lm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2C8CC4CED8; Fri, 8 Nov 2024 15:52:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731081177; bh=RF/R77yecZxwwcV/SQ7kt2sEMgzQozbeyKh2oAd6g0E=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=kAuz11LmrgIiiq2DyAQGkw9EDrvBnoVrf7/LT+Cev/e3XtRLrB81mDJr3IfIORgRW I/psYJeBkan5oZ4+hfYdQbmpKJzeKddAYq5kae1mjy6R/OTALQcqE0gvAUfWCL7pAT bKU2DlMnF1m0KKzNyKPIcXWl9TpY9pLB2MMwiiuh5LW4E4ZfkA2aEduGd8V+NCYh6z 66ND4g7Ym0QFDu5hg+VcTGXq+56bFbR/IhhQMNinYP464LjOHMZFeHIPpF9JR3GU8C 7hpc0Dctpe/9A08T2bXVPVnuA2XKTIAZhs+G6yIzPZhnwhHKYBRFyAI0K6AGdYu2R9 dtCxfVK9EOL8g== From: "Matthieu Baerts (NGI0)" Date: Fri, 08 Nov 2024 16:52:32 +0100 Subject: [PATCH bpf-next/net 3/5] bpf: Acquire and release mptcp socket Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-3-cf16953035c1@kernel.org> References: <20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-0-cf16953035c1@kernel.org> In-Reply-To: <20241108-bpf-next-net-mptcp-bpf_iter-subflows-v1-0-cf16953035c1@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=1993; i=matttbe@kernel.org; h=from:subject:message-id; bh=Mon90wYreVBu0zG7BWuM4v5dwTWYbUA1gVh0OSEBwMA=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBnLjPB9y+Z3Spcbu/1rD0z32/UJ9iKr+fZG4QEk 0AI14lhVoqJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZy4zwQAKCRD2t4JPQmmg c5HeEAC+0D3ACboydhZuejXcW7ZiBI+jPyP8G7/xeVODm3EGzVZhE9jBIhgBnXmkk8H9UfeLu1S /964kUUN8ZftSBqM2fi8Nc8nE07AUdR5BPzh7oaq3YnVfeVtCMn58te7u3piYYlv0Zd3unwdfL7 NuOf+wOqSNv2V7eplnsyQiltUK9qcGB1StyqYpREAPAW2xmn0nNkpfbS7wp1VlkNqDy+uOboeva dNNw3xcyNaFmiHcT6PaOtb6asHZgtVfXwReLwnKS+rAEt+LDScBd11D6NwWr7UcPcwvlDBeDiIm ArC9udmdd9gpP4PZGs0nPs5wpJC10O/RrkZzSZemm5eVJfzCw8rnATiscWdPq8KsOAC49E745UM j4ghxzaitE6Ccbf7NiJLX6CQDbxAQeGsg5xTYivNWvF1WQ2xuENmv9IYfo/dE3io+slE8wBOcnp bq0BRV+Tyjgm0EvHAUp01u9y9XeFQichX/AOzV7NG8E0ASmffXEFIMSXu6zUOoOk66F5/djWpQj QV6QDOnAwQ/9kxE78zevW4QFMZx5Z837bZduGnUxZPlhgVbFRkP5RrEMAjhd0nfgBrAGadN+XxT gxaDBsMJJsC1lZcancObtjdN0cTF7dWJh74QmwGez+vBYrPh/R7LmZe6E7+bYjJydpvHdAIKYjl zmrnclEMWYUuBDQ== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Geliang Tang The KF_TRUSTED_ARGS flag is used for bpf_iter_mptcp_subflow_new, it indicates that the all pointer arguments are valid. It's necessary to add a KF_ACQUIRE helper to get valid "msk". This patch adds bpf_mptcp_sock_acquire() and bpf_mptcp_sock_release() helpers for this. Increase sk->sk_refcnt in _acquire() and decrease it in _release(). Register them with KF_ACQUIRE flag and KF_RELEASE flag. Signed-off-by: Geliang Tang Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- net/mptcp/bpf.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c index d107c2865e97e6ccffb9e0720dfbbd232b63a3b8..5bd04548e846b4dc120dbc83725a604821fac772 100644 --- a/net/mptcp/bpf.c +++ b/net/mptcp/bpf.c @@ -90,6 +90,23 @@ bpf_iter_mptcp_subflow_destroy(struct bpf_iter_mptcp_subflow *it) { } +__bpf_kfunc static struct +mptcp_sock *bpf_mptcp_sock_acquire(struct mptcp_sock *msk) +{ + struct sock *sk = (struct sock *)msk; + + if (sk && refcount_inc_not_zero(&sk->sk_refcnt)) + return msk; + return NULL; +} + +__bpf_kfunc static void bpf_mptcp_sock_release(struct mptcp_sock *msk) +{ + struct sock *sk = (struct sock *)msk; + + WARN_ON_ONCE(!sk || !refcount_dec_not_one(&sk->sk_refcnt)); +} + __bpf_kfunc_end_defs(); BTF_KFUNCS_START(bpf_mptcp_common_kfunc_ids) @@ -99,6 +116,8 @@ BTF_ID_FLAGS(func, bpf_mptcp_subflow_tcp_sock) BTF_ID_FLAGS(func, bpf_iter_mptcp_subflow_new, KF_ITER_NEW | KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_iter_mptcp_subflow_next, KF_ITER_NEXT | KF_RET_NULL) BTF_ID_FLAGS(func, bpf_iter_mptcp_subflow_destroy, KF_ITER_DESTROY) +BTF_ID_FLAGS(func, bpf_mptcp_sock_acquire, KF_ACQUIRE | KF_RET_NULL) +BTF_ID_FLAGS(func, bpf_mptcp_sock_release, KF_RELEASE) BTF_KFUNCS_END(bpf_mptcp_common_kfunc_ids) static const struct btf_kfunc_id_set bpf_mptcp_common_kfunc_set = {