in6_selecthlim
#define SCTP_GET_HLIM(inp, ro) in6_selecthlim(&inp->ip_inp.inp, (ro ? (ro->ro_nh ? (ro->ro_nh->nh_ifp) : (NULL)) : (NULL)));
ip6->ip6_hlim = in6_selecthlim(inp, NULL);
ip->ip_ttl = in6_selecthlim(inp, NULL);
ip6->ip6_hlim = in6_selecthlim(inp, NULL);
ip->ip_ttl = in6_selecthlim(inp, NULL);
rack->r_ctl.fsb.hoplimit = in6_selecthlim(rack->rc_inp, NULL);
rack->r_ctl.fsb.hoplimit = ip6->ip6_hlim = in6_selecthlim(inp, NULL);
ip->ip_ttl = in6_selecthlim(inp, NULL);
ip6->ip6_hlim = in6_selecthlim(inp, NULL);
ip_ttl = in6_selecthlim(inp, NULL);
int in6_selecthlim(struct inpcb *, struct ifnet *);
*hlim = in6_selecthlim(inp, retifp);
*hlim = in6_selecthlim(NULL, retifp);
ip6->ip6_hlim = in6_selecthlim(inp, NULL);