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tcp: parse mptcp options contained in reset packets

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Because TCP-level resets only affect the subflow, there is a MPTCP
option to indicate that the MPTCP-level connection should be closed
immediately without a mptcp-level fin exchange.

This is the 'MPTCP fast close option'.  It can be carried on ack
segments or TCP resets.  In the latter case, its needed to parse mptcp
options also for reset packets so that MPTCP can act accordingly.

Next patch will add receive side fastclose support in MPTCP.

Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Florian Westphal
2020-12-10 14:25:03 -08:00
committed by Jakub Kicinski
parent ab82e996a1
commit 049fe386d3
3 changed files with 10 additions and 7 deletions
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2
net/ipv4/tcp_minisocks.c
View File

@@ -801,7 +801,7 @@ embryonic_reset:
req->rsk_ops->send_reset(sk, skb);
} else if (fastopen) { /* received a valid RST pkt */
reqsk_fastopen_remove(sk, req, true);
tcp_reset(sk);
tcp_reset(sk, skb);
}
if (!fastopen) {
inet_csk_reqsk_queue_drop(sk, req);