tcp: purge write queue upon RST
authorSoheil Hassas Yeganeh <soheil@google.com>
Tue, 27 Feb 2018 23:32:18 +0000 (18:32 -0500)
committerDavid S. Miller <davem@davemloft.net>
Wed, 28 Feb 2018 16:41:33 +0000 (11:41 -0500)
commita27fd7a8ed3856faaf5a2ff1c8c5f00c0667aaa0
tree031fd30979153e8a2227169e3ccf77b61c081593
parent55e84dd7ec0a0f832a70b7fb39d8fb62f66b09fa
tcp: purge write queue upon RST

When the connection is reset, there is no point in
keeping the packets on the write queue until the connection
is closed.

RFC 793 (page 70) and RFC 793-bis (page 64) both suggest
purging the write queue upon RST:
https://tools.ietf.org/html/draft-ietf-tcpm-rfc793bis-07

Moreover, this is essential for a correct MSG_ZEROCOPY
implementation, because userspace cannot call close(fd)
before receiving zerocopy signals even when the connection
is reset.

Fixes: f214f915e7db ("tcp: enable MSG_ZEROCOPY")
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_input.c