Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2//
3// Send a RST to a TFO socket after it has been accepted.
4//
5// First read() will return all the data and this is consistent
6// with the non-TFO case. Second read will return -1
7
8`./defaults.sh`
9
10 0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3
11 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
12 +0 bind(3, ..., ...) = 0
13 +0 listen(3, 1) = 0
14 +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0
15
16 +0 < S 0:10(10) win 32792 <mss 1460,sackOK,nop,nop,FO TFO_COOKIE,nop,nop>
17 +0 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK>
18
19 +0 accept(3, ..., ...) = 4
20 +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }%
21 +0 %{ assert tcpi_state == TCP_SYN_RECV, tcpi_state }%
22
23// 1st read will return the data from SYN.
24// tcp_reset() sets sk->sk_err to ECONNRESET for SYN_RECV.
25 +0 < R. 11:11(0) win 32792
26 +0 %{ assert tcpi_state == TCP_CLOSE, tcpi_state }%
27
28// This one w/o ACK bit will cause the same effect.
29// +0 < R 11:11(0) win 32792
30// See Step 2 in tcp_validate_incoming().
31
32// found_ok_skb in tcp_recvmsg_locked()
33 +0 read(4, ..., 512) = 10
34
35// !copied && sk->sk_err -> sock_error(sk)
36 +0 read(4, ..., 512) = -1 ECONNRESET (Connection reset by peer)
37 +0 close(4) = 0