| // SPDX-License-Identifier: GPL-2.0 |
| // Test various DSACK (RFC 2883) behaviors. |
| |
| --mss=1000 |
| |
| `./defaults.sh` |
| |
| |
| 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 <mss 1460,nop,nop,sackOK,nop,wscale 8> |
| +.1 < . 1:1(0) ack 1 win 1024 |
| +0 accept(3, ..., ...) = 4 |
| |
| // First SACK range. |
| +0 < P. 1001:2001(1000) ack 1 win 1024 |
| +0 > . 1:1(0) ack 1 <nop, nop, sack 1001:2001> |
| |
| // Check SACK coalescing (contiguous sequence). |
| +0 < P. 2001:3001(1000) ack 1 win 1024 |
| +0 > . 1:1(0) ack 1 <nop,nop,sack 1001:3001> |
| |
| // Check we have two SACK ranges for non contiguous sequences. |
| +0 < P. 4001:5001(1000) ack 1 win 1024 |
| +0 > . 1:1(0) ack 1 <nop,nop,sack 4001:5001 1001:3001> |
| |
| // Three ranges. |
| +0 < P. 7001:8001(1000) ack 1 win 1024 |
| +0 > . 1:1(0) ack 1 <nop,nop,sack 7001:8001 4001:5001 1001:3001> |
| |
| // DSACK (1001:3001) + SACK (6001:7001) |
| +0 < P. 1:6001(6000) ack 1 win 1024 |
| +0 > . 1:1(0) ack 6001 <nop,nop,sack 1001:3001 7001:8001> |
| |
| // DSACK (7001:8001) |
| +0 < P. 6001:8001(2000) ack 1 win 1024 |
| +0 > . 1:1(0) ack 8001 <nop,nop,sack 7001:8001> |
| |
| // DSACK for an older segment. |
| +0 < P. 1:1001(1000) ack 1 win 1024 |
| +0 > . 1:1(0) ack 8001 <nop,nop,sack 1:1001> |
