diff options
Diffstat (limited to 'test/packetdrill/netstack')
| -rw-r--r-- | test/packetdrill/netstack/tcp_user_timeout.pkt | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/packetdrill/netstack/tcp_user_timeout.pkt b/test/packetdrill/netstack/tcp_user_timeout.pkt new file mode 100644 index 000000000..60103adba --- /dev/null +++ b/test/packetdrill/netstack/tcp_user_timeout.pkt @@ -0,0 +1,38 @@ +// Test that a socket w/ TCP_USER_TIMEOUT set aborts the connection +// if there is pending unacked data after the user specified timeout. + +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 ++0 bind(3, ..., ...) = 0 + ++0 listen(3, 1) = 0 + +// Establish a connection without timestamps. ++0 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7> ++0 > S. 0:0(0) ack 1 <...> ++0.1 < . 1:1(0) ack 1 win 32792 + ++0.100 accept(3, ..., ...) = 4 + +// Okay, we received nothing, and decide to close this idle socket. +// We set TCP_USER_TIMEOUT to 3 seconds because really it is not worth +// trying hard to cleanly close this flow, at the price of keeping +// a TCP structure in kernel for about 1 minute! ++2 setsockopt(4, SOL_TCP, TCP_USER_TIMEOUT, [3000], 4) = 0 + +// The write/ack is required mainly for netstack as netstack does +// not update its RTO during the handshake. ++0 write(4, ..., 100) = 100 ++0 > P. 1:101(100) ack 1 <...> ++0 < . 1:1(0) ack 101 win 32792 + ++0 close(4) = 0 + ++0 > F. 101:101(0) ack 1 <...> ++.2~+.300 > F. 101:101(0) ack 1 <...> ++.4~+.500 > F. 101:101(0) ack 1 <...> ++.8~+.900 > F. 101:101(0) ack 1 <...> + +// We finally receive something from the peer, but it is way too late +// Our socket vanished because TCP_USER_TIMEOUT was really small. ++1.61 < . 1:2(1) ack 102 win 32792 ++0 > R 102:102(0) win 0 |