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mptcp: handle defer connect in mptcp_sendmsg

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When TCP_FASTOPEN_CONNECT has been set on the socket before a connect,
the defer flag is set and must be handled when sendmsg is called.

This is similar to what is done in tcp_sendmsg_locked().

Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Co-developed-by: Benjamin Hesmans <benjamin.hesmans@tessares.net>
Signed-off-by: Benjamin Hesmans <benjamin.hesmans@tessares.net>
Signed-off-by: Dmytro Shytyi <dmytro@shytyi.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:
Dmytro Shytyi 2022-09-26 16:27:38 -07:00 committed by Jakub Kicinski
parent 3242abeb8d
commit d98a82a6af
1 changed files with 22 additions and 0 deletions
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22
net/mptcp/protocol.c
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@ -1677,6 +1677,7 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
{
struct mptcp_sock *msk = mptcp_sk(sk);
struct page_frag *pfrag;
struct socket *ssock;
size_t copied = 0;
int ret = 0;
long timeo;
@ -1690,6 +1691,27 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
lock_sock(sk);
ssock = __mptcp_nmpc_socket(msk);
if (unlikely(ssock && inet_sk(ssock->sk)->defer_connect)) {
struct sock *ssk = ssock->sk;
int copied_syn = 0;
lock_sock(ssk);
ret = tcp_sendmsg_fastopen(ssk, msg, &copied_syn, len, NULL);
copied += copied_syn;
if (ret == -EINPROGRESS && copied_syn > 0) {
/* reflect the new state on the MPTCP socket */
inet_sk_state_store(sk, inet_sk_state_load(ssk));
release_sock(ssk);
goto out;
} else if (ret) {
release_sock(ssk);
goto out;
}
release_sock(ssk);
}
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) {