diff options
Diffstat (limited to 'test/packetdrill/tests/linux/mss/mss-getsockopt-tcp_maxseg-server-advmss-ts-ipv4.pkt')
| -rw-r--r-- | test/packetdrill/tests/linux/mss/mss-getsockopt-tcp_maxseg-server-advmss-ts-ipv4.pkt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/test/packetdrill/tests/linux/mss/mss-getsockopt-tcp_maxseg-server-advmss-ts-ipv4.pkt b/test/packetdrill/tests/linux/mss/mss-getsockopt-tcp_maxseg-server-advmss-ts-ipv4.pkt new file mode 100644 index 0000000..2222d51 --- /dev/null +++ b/test/packetdrill/tests/linux/mss/mss-getsockopt-tcp_maxseg-server-advmss-ts-ipv4.pkt @@ -0,0 +1,30 @@ +// Test that getsockopt of TCP_MAXSEG works on passive/server TCP connections. +// In this variant we test that we get the expected result when +// the routing config specifies an "advmss 1430 mtu lock 1470" for the +// route to the remote IP under test. + +// To ensure that we do not cache something that interferes with other tests: +--remote_ip="192.0.2.2" + +`ip route change 192.0.2.2 via 192.168.0.2 dev tun0 advmss 1430 mtu lock 1470` + +// Set up a listening socket. +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 ++0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 ++0 bind(3, ..., ...) = 0 ++0 listen(3, 1) = 0 + +// Establish a connection ++0 < S 0:0(0) win 32792 <mss 1460,sackOK,TS val 0 ecr 0,nop,wscale 7> ++0 > S. 0:0(0) ack 1 <mss 1430,sackOK,TS val 0 ecr 0,nop,wscale 6> ++0 < . 1:1(0) ack 1 win 257 <nop,nop,TS val 0 ecr 0> + ++0 accept(3, ..., ...) = 4 + +// Verify that the kernel reduced the returned segment size +// to account for TCP timestamps. ++0 getsockopt(4, SOL_TCP, TCP_MAXSEG, [1418], [4]) = 0 + ++0 write(4, ..., 1500) = 1500 ++0 > . 1:1419(1418) ack 1 <nop,nop,TS val 0 ecr 0> ++0 > P. 1419:1501(82) ack 1 <nop,nop,TS val 0 ecr 0> |