| // SPDX-License-Identifier: GPL-2.0 |
| // |
| // Send a RST to a TFO socket before it is accepted. |
| // |
| // The socket won't go away and after it's accepted the data |
| // in the SYN pkt can still be read. But that's about all that |
| // the acceptor can do with the socket. |
| |
| `./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,nop,wscale 7,FO TFO_COOKIE,nop,nop> |
| +0 > S. 0:0(0) ack 11 <mss 1460,nop,nop,sackOK,nop,wscale 8> |
| |
| // 1st read will return the data from SYN. |
| +0 < R. 11:11(0) win 257 |
| |
| // This one w/o ACK bit will cause the same effect. |
| // +0 < R 11:11(0) win 257 |
| |
| +0 accept(3, ..., ...) = 4 |
| +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }% |
| +0 %{ assert tcpi_state == TCP_CLOSE, tcpi_state }% |
| |
| +0 read(4, ..., 512) = 10 |
| +0 read(4, ..., 512) = -1 ECONNRESET (Connection reset by peer) |
| +0 close(4) = 0 |
