icmp6_ifstat
((struct in6_ifextra *)((ifp)->if_afdata[AF_INET6]))->icmp6_ifstat->tag++; \
ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat),
free(ext->icmp6_ifstat, M_IFADDR);
*((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
struct icmp6_ifstat ifru_icmp6stat;
struct icmp6_ifstat *icmp6_ifstat;