sys/net/route.c

634 	if (rt == NULL || (rt_mask(rt) && rt_mask(rt)->sa_len < 2))
857 		src = rt_mask(rt);
863 			 * assume rt_mask() to have the same length
884 		if (rt_mask(rt) != NULL) {
885 			info->rti_info[RTAX_NETMASK] = rt_mask(rt);
1034 	info->rti_info[RTAX_NETMASK] = rt_mask(rt);
1101 				di.info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1413 	mask = rt_mask(rt);
1548 				mask = rt_mask(rt0);