mptcp: relax check on MPC passive fallback

While testing the blamed commit below, I was able to miss (!) packetdrill failures in the fastopen test-cases. On passive fastopen the child socket is created by incoming TCP MPC syn, allow for both MPC_SYN and MPC_ACK header. Fixes: 724b00c ("mptcp: refine opt_mp_capable determination") Signed-off-by: Paolo Abeni <[email protected]>
intel-lab-lkp · Jan 15, 2024 · cb83e36 · cb83e36
1 parent ea81989
commit cb83e36
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
@@ -783,7 +783,8 @@ static struct sock *subflow_syn_recv_sock(const struct sock *sk,
 		 * options.
 		 */
 		mptcp_get_options(skb, &mp_opt);
-		if (!(mp_opt.suboptions & OPTION_MPTCP_MPC_ACK))
+		if (!(mp_opt.suboptions &
+		      (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_ACK)))
 			fallback = true;
 
 	} else if (subflow_req->mp_join) {