diff options
Diffstat (limited to 'test/packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt')
| -rw-r--r-- | test/packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/test/packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt b/test/packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt new file mode 100644 index 0000000..a1416d9 --- /dev/null +++ b/test/packetdrill/tests/linux/fast_retransmit/fr-4pkt-sack-linux.pkt @@ -0,0 +1,35 @@ +// Test fast retransmit with 4 packets outstanding, receiver sending SACKs. +// In this variant the receiver supports SACK. + +// Establish a connection. +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 + ++0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> ++0 > S. 0:0(0) ack 1 <...> + ++.1 < . 1:1(0) ack 1 win 257 ++0 accept(3, ..., ...) = 4 + +// Send 1 data segment and get an ACK, so cwnd is now 4. ++0 write(4, ..., 1000) = 1000 ++0 > P. 1:1001(1000) ack 1 + ++.1 < . 1:1(0) ack 1001 win 257 + +// Write 4 data segments. ++0 write(4, ..., 4000) = 4000 ++0 > P. 1001:5001(4000) ack 1 + +// Get 3 SACKs. ++.1 < . 1:1(0) ack 1001 win 257 <sack 2001:3001,nop,nop> ++0 < . 1:1(0) ack 1001 win 257 <sack 2001:4001,nop,nop> ++0 < . 1:1(0) ack 1001 win 257 <sack 2001:5001,nop,nop> +// We've received 3 duplicate ACKs, so we do a fast retransmit. ++0 > . 1001:2001(1000) ack 1 + +// Receiver ACKs all data. ++.1 < . 1:1(0) ack 6001 win 257 |