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Date: Wed, 22 May 2019 16:39:37 -0400 From: Jason Baron <jbaron@...mai.com> To: davem@...emloft.net, edumazet@...gle.com Cc: ycheng@...gle.com, ilubashe@...mai.com, netdev@...r.kernel.org, Christoph Paasch <cpaasch@...le.com> Subject: [PATCH net-next 5/6] Documentation: ip-sysctl.txt: Document tcp_fastopen_key Add docs for /proc/sys/net/ipv4/tcp_fastopen_key Signed-off-by: Christoph Paasch <cpaasch@...le.com> Signed-off-by: Jason Baron <jbaron@...mai.com> --- 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 14fe930..e8d848e 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 separted + by a '-' as: xxxxxxxx-xxxxxxxx-xxxxxxxx-xxxxxxxx. Leading zeros may be + omitted. A primary and a backup key may be specified by separting them + by a comma. If only one key is specified, it becomes the primary key and + any previous 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 -- 2.7.4
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