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// SPDX-License-Identifier: GPL-2.0
//
// Send a RST to a TFO socket after it has been accepted.
//
// First read() will return all the data and this is consistent
// with the non-TFO case. Second read will return -1
`./defaults.sh`
0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
+0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0
+0 < S 0:10(10) win 32792 <mss 1460,sackOK,nop,nop,FO TFO_COOKIE,nop,nop>
+0 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK>
+0 accept(3, ..., ...) = 4
+0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }%
+0 %{ assert tcpi_state == TCP_SYN_RECV, tcpi_state }%
// 1st read will return the data from SYN.
// tcp_reset() sets sk->sk_err to ECONNRESET for SYN_RECV.
+0 < R. 11:11(0) win 32792
+0 %{ assert tcpi_state == TCP_CLOSE, tcpi_state }%
// This one w/o ACK bit will cause the same effect.
// +0 < R 11:11(0) win 32792
// See Step 2 in tcp_validate_incoming().
// found_ok_skb in tcp_recvmsg_locked()
+0 read(4, ..., 512) = 10
// !copied && sk->sk_err -> sock_error(sk)
+0 read(4, ..., 512) = -1 ECONNRESET (Connection reset by peer)
+0 close(4) = 0
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