ipmp_grp_lookup
extern ipmp_grp_t *ipmp_grp_lookup(const char *, ip_stack_t *);
grp = ipmp_grp_lookup(lifr->lifr_groupname, ipst);
if ((grp = ipmp_grp_lookup(lifgr->gi_grname, ipst)) == NULL) {
if (ipmp_grp_lookup(ill->ill_name, ipst) != NULL) {