in6_matchlen
tlen = in6_matchlen(IFA_IN6(ifa), dst);
in6_matchlen(IFA_IN6(ifa), dst);
blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
tlen = in6_matchlen(IFA_IN6(ifa), dst);
int in6_matchlen (struct in6_addr *, struct in6_addr *);