From: Kuniyuki Iwashima Date: Sat, 27 Sep 2025 21:29:44 +0000 (+0000) Subject: selftest: packetdrill: Add test for experimental option. X-Git-Tag: v6.18-rc1~132^2~20^2~7 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e57b3933abcec26255fd9b4405badfc22af67da2;p=thirdparty%2Flinux.git selftest: packetdrill: Add test for experimental option. The only difference between non-experimental vs experimental TFO option handling is SYN+ACK generation. When tcp_parse_fastopen_option() parses a TFO option, it sets tcp_fastopen_cookie.exp to false if the option number is 34, and true if 255. The value is carried to tcp_options_write() to generate a TFO option with the same option number. Other than that, all the TFO handling is the same and the kernel must generate the same cookie regardless of the option number. Let's add a test for the handling so that we can consolidate fastopen/server/ tests and fastopen/server/opt34 tests. Signed-off-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20250927213022.1850048-7-kuniyu@google.com Signed-off-by: Jakub Kicinski --- diff --git a/tools/testing/selftests/net/packetdrill/tcp_fastopen_server_experimental_option.pkt b/tools/testing/selftests/net/packetdrill/tcp_fastopen_server_experimental_option.pkt new file mode 100644 index 0000000000000..c3cb0e8bdcf85 --- /dev/null +++ b/tools/testing/selftests/net/packetdrill/tcp_fastopen_server_experimental_option.pkt @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Test the Experimental Option +// +// SYN w/ FOEXP w/o cookie must generates SYN+ACK w/ FOEXP +// w/ a valid cookie, and the cookie must be the same one +// with one generated by IANA FO + +`./defaults.sh` + +// Request a TFO cookie by Experimental Option +// This must generate the same TFO_COOKIE + 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 + +0 > S. 0:0(0) ack 1 + + +0 close(3) = 0 + +// Test if FOEXP with a valid cookie creates a TFO socket + 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 + +0 > S. 0:0(0) ack 11 + + +0 accept(3, ..., ...) = 4 + +0 %{ assert (tcpi_options & TCPI_OPT_SYN_DATA) != 0, tcpi_options }% + + +0 read(4, ..., 512) = 10