ICMPV6_ROUTER_PREF_INVALID 1162 net/ipv6/ndisc.c if (pref == ICMPV6_ROUTER_PREF_INVALID || ICMPV6_ROUTER_PREF_INVALID 482 net/ipv6/route.c if (pref == ICMPV6_ROUTER_PREF_INVALID)