mptcp: Trigger sending when new subflow gets established

We can run into a situation where we run out of subflows but have data sitting the write-queue or reinject-queue. When a new subflow comes in, we have to trigger sending right away. Fixes: Zero-day bug Signed-off-by: Christoph Paasch <[email protected]> Signed-off-by: Matthieu Baerts <[email protected]>
multipath-tcp · Feb 1, 2019 · 14e9764 · 14e9764
1 parent 88eee5e
commit 14e9764
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
@@ -6283,10 +6283,13 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
 		 * using an MP_JOIN subtype.
 		 */
 		if (mptcp(tp)) {
-			if (is_master_tp(tp))
+			if (is_master_tp(tp)) {
 				mptcp_update_metasocket(mptcp_meta_sk(sk));
-			else
+			} else {
 				tcp_send_ack(sk);
+
+				mptcp_push_pending_frames(mptcp_meta_sk(sk));
+			}
 		}
 		break;