On Wed, 2015-11-18 at 16:03 +0100, Florian Westphal wrote: > RFC 1122, 4.2.2.13: > [..] if new data is received after CLOSE is called, its TCP > SHOULD send a RST to show that data was lost. > > When a connection is closed actively, it MUST linger in > TIME-WAIT state [..]. > > We reset a connection, but destroy state immediately. > > After discussing this with Hannes, we decided it was preferable > to also move to TW state to avoid immediate port reuse. > > packetdrill testcase: > > 0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 > 0.000 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 > 0.000 bind(3, ..., ...) = 0 > 0.000 listen(3, 1) = 0 > 0.100 < S 0:0(0) win 29200 <mss 1460> > 0.100 > S. 0:0(0) ack 1 <mss 1460> > 0.200 < . 1:1(0) ack 1 win 257 > 0.200 accept(3, ..., ...) = 4 > // close our side. > 0.210 close(4) = 0 > // we should expect to see FIN now, sk moves to FIN_WAIT_1 > 0.210 > F. 1:1(0) ack 1 win 29200 > // receive data, but sk already closed -> Reset > 0.300 < P. 1:1001(1000) ack 1 win 46 > 0.300 > R 1:1(0) win 0
Thanks for using packetdrill ;) This packetdrill test shows nothing special regarding your patch, it should work right now with current kernels ??? lpk51:~# tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes lpk51:~# ./packetdrill Florian.pkt 07:26:49.656548 IP 192.0.2.1.59883 > 192.168.155.177.8080: Flags [S], seq 0, win 29200, options [mss 1460], length 0 07:26:49.656611 IP 192.168.155.177.8080 > 192.0.2.1.59883: Flags [S.], seq 1433468786, ack 1, win 29200, options [mss 1460], length 0 07:26:49.756530 IP 192.0.2.1.59883 > 192.168.155.177.8080: Flags [.], ack 1, win 257, length 0 07:26:49.766529 IP 192.168.155.177.8080 > 192.0.2.1.59883: Flags [F.], seq 1, ack 1, win 29200, length 0 07:26:49.856529 IP 192.0.2.1.59883 > 192.168.155.177.8080: Flags [P.], seq 1:1001, ack 1, win 46, length 1000: HTTP 07:26:49.856560 IP 192.168.155.177.8080 > 192.0.2.1.59883: Flags [R], seq 1433468787, win 0, length 0 07:26:49.856806 IP 192.0.2.1.59883 > 192.168.155.177.8080: Flags [R.], seq 1001, ack 1, win 46, length 0 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
