| // SPDX-License-Identifier: GPL-2.0 |
| // |
| // Test SYN+ACK RTX with 1s RTO. |
| // |
| `./defaults.sh |
| ./set_sysctls.py /proc/sys/net/ipv4/tcp_rto_max_ms=1000` |
| |
| // |
| // Test 1: TFO SYN+ACK |
| // |
| 0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3 |
| +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 |
| +0 bind(3, ..., ...) = 0 |
| +0 listen(3, 1) = 0 |
| +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0 |
| |
| +0 < S 0:10(10) win 1000 <mss 1460,sackOK,nop,nop,FO TFO_COOKIE,nop,nop> |
| +0 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> |
| |
| // RTO must be capped to 1s |
| +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> |
| +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> |
| +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK> |
| |
| +0 < . 11:11(0) ack 1 win 1000 <mss 1460,nop,nop,sackOK> |
| +0 accept(3, ..., ...) = 4 |
| +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }% |
| |
| +0 close(4) = 0 |
| +0 close(3) = 0 |
| |
| |
| // |
| // Test 2: non-TFO SYN+ACK |
| // |
| +0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, 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 1000 <mss 1460,sackOK,nop,nop> |
| +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> |
| |
| // RTO must be capped to 1s |
| +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> |
| +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> |
| +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> |
| |
| +0 < . 1:1(0) ack 1 win 1000 <mss 1460,nop,nop,sackOK> |
| +0 accept(3, ..., ...) = 4 |
| +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) == 0, tcpi_options }% |
| |
| +0 close(4) = 0 |
| +0 close(3) = 0 |
