netdev - [PATCH net-next 1/8] mptcp: add MSG_FASTOPEN sendmsg flag support

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Date:   Fri, 25 Nov 2022 23:29:47 +0100
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Dmytro Shytyi <dmytro@...tyi.net>,
        Benjamin Hesmans <benjamin.hesmans@...sares.net>,
        netdev@...r.kernel.org, mptcp@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/8] mptcp: add MSG_FASTOPEN sendmsg flag support

From: Dmytro Shytyi <dmytro@...tyi.net>

Since commit 54f1944ed6d2 ("mptcp: factor out mptcp_connect()"), all the
infrastructure is now in place to support the MSG_FASTOPEN flag, we
just need to call into the fastopen path in mptcp_sendmsg().

Co-developed-by: Benjamin Hesmans <benjamin.hesmans@...sares.net>
Signed-off-by: Benjamin Hesmans <benjamin.hesmans@...sares.net>
Acked-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Dmytro Shytyi <dmytro@...tyi.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@...sares.net>
---
 net/mptcp/protocol.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 3796d1bfef6b..37876e06d4c4 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1711,17 +1711,14 @@ static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	int ret = 0;
 	long timeo;
 
-	/* we don't support FASTOPEN yet */
-	if (msg->msg_flags & MSG_FASTOPEN)
-		return -EOPNOTSUPP;
-
 	/* silently ignore everything else */
-	msg->msg_flags &= MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL;
+	msg->msg_flags &= MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL | MSG_FASTOPEN;
 
 	lock_sock(sk);
 
 	ssock = __mptcp_nmpc_socket(msk);
-	if (unlikely(ssock && inet_sk(ssock->sk)->defer_connect)) {
+	if (unlikely(ssock && (inet_sk(ssock->sk)->defer_connect ||
+			       msg->msg_flags & MSG_FASTOPEN))) {
 		int copied_syn = 0;
 
 		ret = mptcp_sendmsg_fastopen(sk, ssock->sk, msg, len, &copied_syn);
-- 
2.37.2