This is a note to let you know that I've just added the patch titled
mptcp: don't send RST for single subflow
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mptcp-don-t-send-rst-for-single-subflow.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0a782d12ad419f820fbaf1d637a788097014b5b1
Author: Geliang Tang <geliang.tang@xxxxxxxx>
Date: Fri Apr 22 14:55:36 2022 -0700
mptcp: don't send RST for single subflow
[ Upstream commit 1761fed2567807f26fbd53032ff622f55978c7a9 ]
When a bad checksum is detected and a single subflow is in use, don't
send RST + MP_FAIL, send data_ack + MP_FAIL instead.
So invoke tcp_send_active_reset() only when mptcp_has_another_subflow()
is true.
Signed-off-by: Geliang Tang <geliang.tang@xxxxxxxx>
Signed-off-by: Mat Martineau <mathew.j.martineau@xxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 7919e259175d..ccae50eba664 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1221,14 +1221,14 @@ static bool subflow_check_data_avail(struct sock *ssk)
/* RFC 8684 section 3.7. */
if (subflow->send_mp_fail) {
if (mptcp_has_another_subflow(ssk)) {
+ ssk->sk_err = EBADMSG;
+ tcp_set_state(ssk, TCP_CLOSE);
+ subflow->reset_transient = 0;
+ subflow->reset_reason = MPTCP_RST_EMIDDLEBOX;
+ tcp_send_active_reset(ssk, GFP_ATOMIC);
while ((skb = skb_peek(&ssk->sk_receive_queue)))
sk_eat_skb(ssk, skb);
}
- ssk->sk_err = EBADMSG;
- tcp_set_state(ssk, TCP_CLOSE);
- subflow->reset_transient = 0;
- subflow->reset_reason = MPTCP_RST_EMIDDLEBOX;
- tcp_send_active_reset(ssk, GFP_ATOMIC);
WRITE_ONCE(subflow->data_avail, MPTCP_SUBFLOW_NODATA);
return true;
}
