1// SPDX-License-Identifier: GPL-2.0 2// 3// Basic TFO server test 4// 5// Test TFO_SERVER_COOKIE_NOT_REQD flag on receiving 6// SYN with data but without Fast Open cookie option. 7 8`./defaults.sh 9 ./set_sysctls.py /proc/sys/net/ipv4/tcp_fastopen=0x202` 10 11 0 socket(..., SOCK_STREAM|SOCK_NONBLOCK, IPPROTO_TCP) = 3 12 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 13 +0 bind(3, ..., ...) = 0 14 +0 listen(3, 1) = 0 15 +0 setsockopt(3, SOL_TCP, TCP_FASTOPEN, [1], 4) = 0 16 17// Since TFO_SERVER_COOKIE_NOT_REQD, a TFO socket will be created with 18// the data accepted. 19 +0 < S 0:1000(1000) win 32792 <mss 1460,sackOK,nop,nop> 20 +0 > S. 0:0(0) ack 1001 <mss 1460,nop,nop,sackOK> 21 +0 accept(3, ..., ...) = 4 22 +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }% 23 +0 read(4, ..., 1024) = 1000 24 25// Data After SYN will be accepted too. 26 +0 < . 1001:2001(1000) ack 1 win 5840 27 +0 > . 1:1(0) ack 2001 28 29// Should change the implementation later to set the SYN flag as well. 30 +0 read(4, ..., 1024) = 1000 31 +0 write(4, ..., 1000) = 1000 32 +0 > P. 1:1001(1000) ack 2001 33