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 edumazet@google.com Cc: Paolo Abeni pabeni@redhat.com Signed-off-by: Antonio Quartulli antonio@openvpn.net --- 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 6a256684d68682bd4dfab93dbff092d238192316..e4df039f959e8af945844b2bbcd9ea416e1bcec9 100644 --- a/drivers/net/ovpn/skb.h +++ b/drivers/net/ovpn/skb.h @@ -25,6 +25,7 @@ struct ovpn_cb { struct scatterlist *sg; u8 *iv; 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 c7eb96d79e0229d178e1cf090cea45361730685e..c4d90cfeaaf7d032270fa2c9cb78f4ca7745750f 100644 --- a/drivers/net/ovpn/tcp.c +++ b/drivers/net/ovpn/tcp.c @@ -210,6 +210,7 @@ void ovpn_tcp_socket_detach(struct ovpn_socket *ovpn_sock) static void ovpn_tcp_send_sock(struct ovpn_peer *peer, struct sock *sk) { struct sk_buff *skb = peer->tcp.out_msg.skb; + int ret, flags;
if (!skb) return; @@ -220,9 +221,11 @@ static void ovpn_tcp_send_sock(struct ovpn_peer *peer, struct sock *sk) peer->tcp.tx_in_progress = true;
do { - int ret = skb_send_sock_locked(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(sk, skb, + peer->tcp.out_msg.offset, + peer->tcp.out_msg.len, + flags); if (unlikely(ret < 0)) { if (ret == -EAGAIN) goto out; @@ -363,7 +366,7 @@ static int ovpn_tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
lock_sock(sk);
- if (msg->msg_flags & ~MSG_DONTWAIT) { + if (msg->msg_flags & ~(MSG_DONTWAIT | MSG_NOSIGNAL)) { ret = -EOPNOTSUPP; goto peer_free; } @@ -396,6 +399,7 @@ 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(peer, sk, skb); ret = size; peer_free: