| // SPDX-License-Identifier: GPL-2.0 | |
| // | |
| // Minimal passive open. | |
| // Peer is first to close. | |
| `./defaults.sh` | |
| // Open listener socket | |
| 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 | |
| // Incoming connection: passive open: three-way handshake | |
| +0 < S 0:0(0) win 65535 <mss 1000,sackOK,nop,nop,nop,wscale 8> | |
| +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> | |
| +0 < . 1:1(0) ack 1 win 257 | |
| // Open connection socket and close listener socket | |
| +0 accept(3, ..., ...) = 4 | |
| +0 close(3) = 0 | |
| // Peer sends data: acknowledge and receive | |
| +0 < P. 1:1001(1000) ack 1 win 257 | |
| +0 > . 1:1(0) ack 1001 | |
| +0 recv(4, ..., 1000, 0) = 1000 | |
| // Peer initiates connection close | |
| +0 < F. 1001:1001(0) ack 1 win 257 | |
| +.04 > . 1:1(0) ack 1002 | |
| // Local socket also closes its side | |
| +0 close(4) = 0 | |
| +0 > F. 1:1(0) ack 1002 | |
| +0 < . 1002:1002(0) ack 2 win 257 |