linux-stable/Documentation/networking/seg6-sysctl.txt

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/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.