PACKET_TAG_IPV6_INPUT
mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);