tcp_rto_synack_rto_max.pkt

 1// SPDX-License-Identifier: GPL-2.0
 2//
 3// Test SYN+ACK RTX with 1s RTO.
 4//
 5`./defaults.sh
 6 ./set_sysctls.py /proc/sys/net/ipv4/tcp_rto_max_ms=1000`
 7
 8//
 9// Test 1: TFO SYN+ACK
10//
11    0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3
12   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
13   +0 bind(3, ..., ...) = 0
14   +0 listen(3, 1) = 0
15   +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0
16
17   +0 < S 0:10(10) win 1000 <mss 1460,sackOK,nop,nop,FO TFO_COOKIE,nop,nop>
18   +0 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK>
19
20// RTO must be capped to 1s
21   +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK>
22   +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK>
23   +1 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK>
24
25   +0 < . 11:11(0) ack 1 win 1000 <mss 1460,nop,nop,sackOK>
26   +0 accept(3, ..., ...) = 4
27   +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }%
28
29   +0 close(4) = 0
30   +0 close(3) = 0
31
32
33//
34// Test 2: non-TFO SYN+ACK
35//
36   +0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3
37   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
38   +0 bind(3, ..., ...) = 0
39   +0 listen(3, 1) = 0
40
41   +0 < S 0:0(0) win 1000 <mss 1460,sackOK,nop,nop>
42   +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
43
44// RTO must be capped to 1s
45   +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
46   +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
47   +1 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK>
48
49   +0 < . 1:1(0) ack 1 win 1000 <mss 1460,nop,nop,sackOK>
50   +0 accept(3, ..., ...) = 4
51   +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) == 0, tcpi_options }%
52
53   +0 close(4) = 0
54   +0 close(3) = 0