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mptcp: relax check on MPC passive fallback 

[ Upstream commit c0f5aec28edf98906d28f08daace6522adf9ee7a ]

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: 724b00c12957 ("mptcp: refine opt_mp_capable determination")
Reviewed-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paolo Abeni 2024-01-16 18:18:47 +01:00 committed by Greg Kroah-Hartman
parent 9aeb09f4d8
commit 72b45857b7
1 changed files with 2 additions and 1 deletions
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3
net/mptcp/subflow.c
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@ -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) {