TCPCT part 1c: sysctl_tcp_cookie_size, socket option TCP_COOKIE_TRANSACTIONS

[mirror_ubuntu-jammy-kernel.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 554440af675c0ca589958d7ec2cbd1ca5917f9f6..989f5538b8ddf668f70690474767bb851cf4341e 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -164,6 +164,14 @@ tcp_congestion_control - STRING
        additional choices may be available based on kernel configuration.
        Default is set as part of kernel configuration.
 
+tcp_cookie_size - INTEGER
+       Default size of TCP Cookie Transactions (TCPCT) option, that may be
+       overridden on a per socket basis by the TCPCT socket option.
+       Values greater than the maximum (16) are interpreted as the maximum.
+       Values greater than zero and less than the minimum (8) are interpreted
+       as the minimum.  Odd values are interpreted as the next even value.
+       Default: 0 (off).
+
 tcp_dsack - BOOLEAN
        Allows TCP to send "duplicate" SACKs.