IPv6: Segment Routing HMAC support

configname: CONFIG_IPV6_SEG6_HMAC

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The IPv6 protocol
└─>IPv6: Segment Routing HMAC support
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Support for HMAC signature generation and verification
of SR-enabled packets.

If unsure, say N.