IPV6_PMTUDISC_DO 1455 net/ipv6/ip6_output.c 	if (np->pmtudisc < IPV6_PMTUDISC_DO)
IPV6_PMTUDISC_DO  330 net/ipv6/raw.c 		harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);