rtable_getsource
addr = rtable_getsource(rtableid, src->sa_family);
struct sockaddr *rtable_getsource(unsigned int, int);
info.rti_info[RTAX_IFA] = rtable_getsource(rtableid,
rtable_getsource(id, info.rti_info[RTAX_DST]->sa_family);
if ((sa = rtable_getsource(tableid, af)) != NULL) {
info.rti_info[RTAX_IFA] = rtable_getsource(tableid,
ip4_source = rtable_getsource(rtableid, AF_INET);
sourceaddr = rtable_getsource(rtableid, AF_INET);
sourceaddr = rtable_getsource(rtableid, AF_INET6);
ip6_source = rtable_getsource(rtableid, AF_INET6);