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mptcp: poll allow write call before actual connect 

If fastopen is used, poll must allow a first write that will trigger
the SYN+data

Similar to what is done in tcp_poll().

Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Benjamin Hesmans <benjamin.hesmans@tessares.net>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Benjamin Hesmans 2022-09-26 16:27:39 -07:00 committed by Jakub Kicinski
parent d98a82a6af
commit a42cf9d182
1 changed files with 4 additions and 0 deletions
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4
net/mptcp/protocol.c
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@ -3548,6 +3548,7 @@ static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
do_connect:
err = ssock->ops->connect(ssock, uaddr, addr_len, flags);
inet_sk(sock->sk)->defer_connect = inet_sk(ssock->sk)->defer_connect;
sock->state = ssock->state;
/* on successful connect, the msk state will be moved to established by
@ -3698,6 +3699,9 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
if (state != TCP_SYN_SENT && state != TCP_SYN_RECV) {
mask |= mptcp_check_readable(msk);
mask |= mptcp_check_writeable(msk);
} else if (state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) {
/* cf tcp_poll() note about TFO */
mask |= EPOLLOUT | EPOLLWRNORM;
}
if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE)
mask |= EPOLLHUP;