ipv6: sr: add documentation file for per-interface sysctls

This patch adds documentation for some SR-related per-interface
sysctls.

Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/seg6-sysctl.txt b/Documentation/networking/seg6-sysctl.txt
new file mode 100644 (file)
index 0000000..bdbde23
--- /dev/null
+++ b/Documentation/networking/seg6-sysctl.txt
@@ -0,0 +1,18 @@
+/proc/sys/net/conf/<iface>/seg6_* variables:
+
+seg6_enabled - BOOL
+       Accept or drop SR-enabled IPv6 packets on this interface.
+
+       Relevant packets are those with SRH present and DA = local.
+
+       0 - disabled (default)
+       not 0 - enabled
+
+seg6_require_hmac - INTEGER
+       Define HMAC policy for ingress SR-enabled packets on this interface.
+
+       -1 - Ignore HMAC field
+       0 - Accept SR packets without HMAC, validate SR packets with HMAC
+       1 - Drop SR packets without HMAC, validate SR packets with HMAC
+
+       Default is 0.