| // 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 |
