tcp: Reset tcp connections in SYN-SENT state
authorManoj Basapathi <manojbm@codeaurora.org>
Mon, 5 Apr 2021 17:02:42 +0000 (22:32 +0530)
committerDavid S. Miller <davem@davemloft.net>
Tue, 6 Apr 2021 23:17:20 +0000 (16:17 -0700)
commite880f8b3a24a73704731a7227ed5fee14bd90192
tree2fc8966c86dcff97ad2f2d61e7524011265e1f7f
parentcc0626c2aaed8e475efdd85fa374b497a7192e35
tcp: Reset tcp connections in SYN-SENT state

Userspace sends tcp connection (sock) destroy on network switch
i.e switching the default network of the device between multiple
networks(Cellular/Wifi/Ethernet).

Kernel though doesn't send reset for the connections in SYN-SENT state
and these connections continue to remain.
Even as per RFC 793, there is no hard rule to not send RST on ABORT in
this state.

Modify tcp_abort and tcp_disconnect behavior to send RST for connections
in syn-sent state to avoid lingering connections on network switch.

Signed-off-by: Manoj Basapathi <manojbm@codeaurora.org>
Signed-off-by: Sauvik Saha <ssaha@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp.c