From patchwork Wed Oct 9 09:45:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 13828020 X-Patchwork-Delegate: matthieu.baerts@tessares.net 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 D945A28EF for ; Wed, 9 Oct 2024 09:46:13 +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=1728467173; cv=none; b=i0R3Nv4hqo9bIOZ59QGROpdO7As+V7uP8qH0AHBpavs8sjwMdQG8qY/xcogjDQrd1R6kMJGPYIlFUjqaoq0TjaaT+DydRb9LqvKhPKhznhKXJTJiwPboaT4Aih5pj3RIQRgfQQh1tOpOtP6WSavFHs/OEDHVZc+xfY/+rttOa18= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728467173; c=relaxed/simple; bh=ds9vcLnZuG6PXMN18GiFP755NxYGaiSlT21Y7zWUWSw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rZauHBR06KYN6FDp85wemKxNFXo62WbcgpFir+1HlvOje7/WFBkxZdEhPOcEuDJoWd+0mRyM3k1KUfvy4eUh3/7Vtp3TZQdMnKLa7jkTP0mbQMIsk9sJRL7EyzQ64tjvWDw8Z2jgPvAd1YR10igMwJZycJ8rWQmlKYhkJLnBgSE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=p6Pd8Xwq; 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="p6Pd8Xwq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 798BAC4CECE; Wed, 9 Oct 2024 09:46:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728467173; bh=ds9vcLnZuG6PXMN18GiFP755NxYGaiSlT21Y7zWUWSw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p6Pd8XwqApZr3GYBvx121fRJg0XbHl687rdSTMwiRNcoesSoAwzndcKNfRx/tKARQ 5FodB8gmkBVXobc9vEo7J6JxlOeRU2ykwrJfmywDZJrkke/4b7SBb1+3ULJSC4NHOW 6n7iBsbwPwt26mTJnrEozeS0yZvEN14RZyMuJ5G4HYkOssuo+5+XtNrqwnD34DxHv3 rJGrNVffNEKvv5pOVNc0xxaksFzJbO15gt0pZR+okf8jevwRRu54Okm1EVobe1BG09 VRDTMSq762Ay4YHiCewBrqt9H3rT2n/5Y+mt5MAbtQNsW4M7UriB+Zxklq2KSO3+eX jOCU+oJIljvzg== From: Geliang Tang To: mptcp@lists.linux.dev Cc: Geliang Tang Subject: [PATCH mptcp-next v9 3/7] bpf: Add mptcp_sock acquire and release helpers Date: Wed, 9 Oct 2024 17:45:45 +0800 Message-ID: <193b59575ea5f422ab83cdd64adc40b3b2963230.1728466623.git.tanggeliang@kylinos.cn> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Geliang Tang 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 --- net/mptcp/bpf.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c index fe2ee03ff1ee..9b87eee13955 100644 --- a/net/mptcp/bpf.c +++ b/net/mptcp/bpf.c @@ -255,6 +255,22 @@ __bpf_kfunc void bpf_iter_mptcp_subflow_destroy(struct bpf_iter_mptcp_subflow *i { } +__bpf_kfunc 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 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 struct mptcp_subflow_context * bpf_mptcp_subflow_ctx_by_pos(const struct mptcp_sched_data *data, unsigned int pos) { @@ -278,6 +294,8 @@ BTF_ID_FLAGS(func, mptcp_subflow_active) 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 = {