From 2dc7e48dee68219dd8921824473306036ea45152 Mon Sep 17 00:00:00 2001 From: Jason Baron Date: Wed, 29 May 2019 12:34:00 -0400 Subject: [PATCH] Documentation: ip-sysctl.txt: Document tcp_fastopen_key Add docs for /proc/sys/net/ipv4/tcp_fastopen_key Signed-off-by: Jason Baron Signed-off-by: Christoph Paasch Cc: Jeremy Sowden Acked-by: Yuchung Cheng Signed-off-by: David S. Miller --- Documentation/networking/ip-sysctl.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index 14fe93049d28..a73b3a02e49a 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -648,6 +648,26 @@ tcp_fastopen_blackhole_timeout_sec - INTEGER 0 to disable the blackhole detection. By default, it is set to 1hr. +tcp_fastopen_key - list of comma separated 32-digit hexadecimal INTEGERs + The list consists of a primary key and an optional backup key. The + primary key is used for both creating and validating cookies, while the + optional backup key is only used for validating cookies. The purpose of + the backup key is to maximize TFO validation when keys are rotated. + + A randomly chosen primary key may be configured by the kernel if + the tcp_fastopen sysctl is set to 0x400 (see above), or if the + TCP_FASTOPEN setsockopt() optname is set and a key has not been + previously configured via sysctl. If keys are configured via + setsockopt() by using the TCP_FASTOPEN_KEY optname, then those + per-socket keys will be used instead of any keys that are specified via + sysctl. + + A key is specified as 4 8-digit hexadecimal integers which are separated + by a '-' as: xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx. Leading zeros may be + omitted. A primary and a backup key may be specified by separating them + by a comma. If only one key is specified, it becomes the primary key and + any previously configured backup keys are removed. + tcp_syn_retries - INTEGER Number of times initial SYNs for an active TCP connection attempt will be retransmitted. Should not be higher than 127. Default value -- 2.30.2