1// SPDX-License-Identifier: GPL-2.0
2
3--mss=1000
4
5`./defaults.sh`
6
7    0 `nstat -n`
8
9// Establish a connection.
10   +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
11   +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
12   +0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [20000], 4) = 0
13   +0 bind(3, ..., ...) = 0
14   +0 listen(3, 1) = 0
15
16   +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
17   +0 > S. 0:0(0) ack 1 win 18980 <mss 1460,nop,wscale 0>
18  +.1 < . 1:1(0) ack 1 win 257
19
20   +0 accept(3, ..., ...) = 4
21
22   +0 < P. 1:20001(20000) ack 1 win 257
23 +.04 > .  1:1(0) ack 20001 win 18000
24
25   +0 setsockopt(4, SOL_SOCKET, SO_RCVBUF, [12000], 4) = 0
26   +0 < P. 20001:80001(60000) ack 1 win 257
27   +0 > .  1:1(0) ack 20001 win 18000
28
29   +0 read(4, ..., 20000) = 20000
30// A too big packet is accepted if the receive queue is empty
31   +0 < P. 20001:80001(60000) ack 1 win 257
32   +0 > .  1:1(0) ack 80001 win 0
33
34