| // SPDX-License-Identifier: GPL-2.0 |
| |
| --mss=1000 |
| |
| `./defaults.sh` |
| |
| 0 `nstat -n` |
| |
| // Establish a connection. |
| +0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 |
| +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 |
| +0 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [10000], 4) = 0 |
| +0 bind(3, ..., ...) = 0 |
| +0 listen(3, 1) = 0 |
| |
| +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7> |
| +0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 0> |
| +.1 < . 1:1(0) ack 1 win 257 |
| |
| +0 accept(3, ..., ...) = 4 |
| |
| +0 < P. 1:4001(4000) ack 1 win 257 |
| +0 > . 1:1(0) ack 4001 win 5000 |
| |
| // packet in sequence : SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE / LINUX_MIB_BEYOND_WINDOW |
| +0 < P. 4001:54001(50000) ack 1 win 257 |
| +0 > . 1:1(0) ack 4001 win 5000 |
| |
| // ooo packet. : SKB_DROP_REASON_TCP_INVALID_END_SEQUENCE / LINUX_MIB_BEYOND_WINDOW |
| +1 < P. 5001:55001(50000) ack 1 win 257 |
| +0 > . 1:1(0) ack 4001 win 5000 |
| |
| // SKB_DROP_REASON_TCP_INVALID_SEQUENCE / LINUX_MIB_BEYOND_WINDOW |
| +0 < P. 70001:80001(10000) ack 1 win 257 |
| +0 > . 1:1(0) ack 4001 win 5000 |
| |
| +0 read(4, ..., 100000) = 4000 |
| |
| // If queue is empty, accept a packet even if its end_seq is above wup + rcv_wnd |
| +0 < P. 4001:54001(50000) ack 1 win 257 |
| +0 > . 1:1(0) ack 54001 win 0 |
| |
| // Check LINUX_MIB_BEYOND_WINDOW has been incremented 3 times. |
| +0 `nstat | grep TcpExtBeyondWindow | grep -q " 3 "` |
