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Wed, 18 Dec 2024 17:42:24 -0800 (PST) From: Antonio Quartulli Date: Thu, 19 Dec 2024 02:42:09 +0100 Subject: [PATCH net-next v16 15/26] ovpn: add support for MSG_NOSIGNAL in tcp_sendmsg Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241219-b4-ovpn-v16-15-3e3001153683@openvpn.net> References: <20241219-b4-ovpn-v16-0-3e3001153683@openvpn.net> In-Reply-To: <20241219-b4-ovpn-v16-0-3e3001153683@openvpn.net> To: netdev@vger.kernel.org, Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Antonio Quartulli , Shuah Khan , sd@queasysnail.net, ryazanov.s.a@gmail.com, Andrew Lunn Cc: Simon Horman , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Xiao Liang X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2486; i=antonio@openvpn.net; h=from:subject:message-id; bh=zxwzzE3nSe/2L9mPGgMJNnofJbeP+COcEZoGUu6OnOA=; b=owEBbQGS/pANAwAIAQtw5TqgONWHAcsmYgBnY3oWXZbP6sWaytRRHFfzfox6RkRNuuwyidrp+ rPHRR3XiYeJATMEAAEIAB0WIQSZq9xs+NQS5N5fwPwLcOU6oDjVhwUCZ2N6FgAKCRALcOU6oDjV h63zCAC1r1HFA/sDcwB4AZl02DRa2Jm0cd7Zu8/9Xdz+Uasf/frFbIesh/NTWUgv+MyZJRaviaY KOM8EHkmmaQv+wAYTHjA5LL31tntBO2/Au2c/Z7vZsQc6B+vP6sG59RmXyokNWoTzz0lx6DxPdm imjtAc/4ifLVzBjMgFQCKMGzB+2EYC7dmcaGR5S3PkckB1TETLn55ybKJwAKlJ3WFENZTXEQQiQ x91VzSCl/xjW4l6q+S7EFTYOuW0hMVE1m0/wdBtRUvofc2oQvwkDZAtyp6q8S2v/74bQId+X4t0 EZoHoPUg3NOVeR0hbOa0wAAIUstVX4uCH/3ENo4VXLyQeNFw X-Developer-Key: i=antonio@openvpn.net; a=openpgp; fpr=CABDA1282017C267219885C748F0CCB68F59D14C Userspace may want to pass the MSG_NOSIGNAL flag to tcp_sendmsg() in order to avoid generating a SIGPIPE. To pass this flag down the TCP stack a new skb sending API accepting a flags argument is introduced. Cc: Eric Dumazet Cc: Paolo Abeni Signed-off-by: Antonio Quartulli --- drivers/net/ovpn/skb.h | 1 + drivers/net/ovpn/tcp.c | 12 ++++++++---- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/net/ovpn/skb.h b/drivers/net/ovpn/skb.h index fd19cc3081227e01c4c1ef25155de614b2dc2795..67c6e1e4a79041198f554d7c534bc2373ca96033 100644 --- a/drivers/net/ovpn/skb.h +++ b/drivers/net/ovpn/skb.h @@ -24,6 +24,7 @@ struct ovpn_cb { struct aead_request *req; struct scatterlist *sg; unsigned int payload_offset; + bool nosignal; }; static inline struct ovpn_cb *ovpn_skb_cb(struct sk_buff *skb) diff --git a/drivers/net/ovpn/tcp.c b/drivers/net/ovpn/tcp.c index 9658513cf021681d20de2f4a581ca032d9d3dfdc..f1be4cd94e16953b39901046ede4381018e8a615 100644 --- a/drivers/net/ovpn/tcp.c +++ b/drivers/net/ovpn/tcp.c @@ -222,6 +222,7 @@ void ovpn_tcp_socket_detach(struct socket *sock) static void ovpn_tcp_send_sock(struct ovpn_peer *peer) { struct sk_buff *skb = peer->tcp.out_msg.skb; + int ret, flags; if (!skb) return; @@ -232,9 +233,11 @@ static void ovpn_tcp_send_sock(struct ovpn_peer *peer) peer->tcp.tx_in_progress = true; do { - int ret = skb_send_sock_locked(peer->sock->sock->sk, skb, - peer->tcp.out_msg.offset, - peer->tcp.out_msg.len); + flags = ovpn_skb_cb(skb)->nosignal ? MSG_NOSIGNAL : 0; + ret = skb_send_sock_locked_with_flags(peer->sock->sock->sk, skb, + peer->tcp.out_msg.offset, + peer->tcp.out_msg.len, + flags); if (unlikely(ret < 0)) { if (ret == -EAGAIN) goto out; @@ -371,7 +374,7 @@ static int ovpn_tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) lock_sock(peer->sock->sock->sk); - if (msg->msg_flags & ~MSG_DONTWAIT) { + if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_NOSIGNAL)) { ret = -EOPNOTSUPP; goto peer_free; } @@ -404,6 +407,7 @@ static int ovpn_tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) goto peer_free; } + ovpn_skb_cb(skb)->nosignal = msg->msg_flags & MSG_NOSIGNAL; ovpn_tcp_send_sock_skb(sock->peer, skb); ret = size; peer_free: