1_in6_cksum:_inet6_cksum
2_mbuf_data
3_mbuf_inet6_cksum
4_mbuf_len
5_mbuf_next
6_mbuf_nextpkt
7_mbuf_pkthdr_header
8_mbuf_pkthdr_len
9_mbuf_pkthdr_rcvif
10_mbuf_pkthdr_setheader
11_mbuf_setlen
12_mbuf_setnextpkt
13_mbuf_type
14_nd6_lookup_ipv6
15