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>

1 files changed, 18 insertions, 0 deletions

diff --git a/Documentation/networking/seg6-sysctl.txt b/Documentation/networking/seg6-sysctl.txt
new file mode 100644
index 000000000000..bdbde23b19cb
--- /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.