if_first          897 netinet/in.c   	struct ifnet *ifn, *if_first, *if_target;
if_first          905 netinet/in.c   	  	if_first = TAILQ_FIRST(&ifnet);
if_first          908 netinet/in.c   		if_first = ifp;
if_first          918 netinet/in.c           for (ifn = if_first; ifn != if_target; ifn = TAILQ_NEXT(ifn, if_list)) {