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mptcp: fix state tracking for fallback socket 

We need to cope with some more state transition for
fallback sockets, or could still end-up moving to TCP_CLOSE
too early and avoid spooling some pending data

Fixes: e16163b6e2 ("mptcp: refactor shutdown and close")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2020-11-19 11:45:55 -08:00 committed by Jakub Kicinski
parent b2771d2419
commit 26aa231439
1 changed files with 13 additions and 5 deletions
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14
net/mptcp/protocol.c
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@ -777,7 +777,9 @@ static void mptcp_check_for_eof(struct mptcp_sock *msk)
inet_sk_state_store(sk, TCP_CLOSE_WAIT);
break;
case TCP_FIN_WAIT1:
/* fallback sockets skip TCP_CLOSING - TCP will take care */
inet_sk_state_store(sk, TCP_CLOSING);
break;
case TCP_FIN_WAIT2:
inet_sk_state_store(sk, TCP_CLOSE);
break;
default:
@ -2086,10 +2088,16 @@ static void __mptcp_check_send_data_fin(struct sock *sk)
WRITE_ONCE(msk->snd_nxt, msk->write_seq);
/* fallback socket will not get data_fin/ack, can move to close now */
if (__mptcp_check_fallback(msk) && sk->sk_state == TCP_LAST_ACK) {
/* fallback socket will not get data_fin/ack, can move to the next
* state now
*/
if (__mptcp_check_fallback(msk)) {
if ((1 << sk->sk_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) {
inet_sk_state_store(sk, TCP_CLOSE);
mptcp_close_wake_up(sk);
} else if (sk->sk_state == TCP_FIN_WAIT1) {
inet_sk_state_store(sk, TCP_FIN_WAIT2);
}
}
__mptcp_flush_join_list(msk);