IPV6_PATHMTU      562 net/ipv6/datagram.c 	put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
IPV6_PATHMTU     1216 net/ipv6/ipv6_sockglue.c 	case IPV6_PATHMTU: