Function rt_get_inet_prefix_pmask

freebsd/net/route/route_ctl.c:308–324

* Stores IPv4 address and prefix mask of @rt inside * @paddr and @pmask. Sets mask to INADDR_ANY for host routes. * @pscopeid is currently always set to 0. */

 * @pscopeid is currently always set to 0.
 */
void
rt_get_inet_prefix_pmask(const struct rtentry *rt, struct in_addr *paddr,
    struct in_addr *pmask, uint32_t *pscopeid)
{
	const struct sockaddr_in *dst;

	dst = (const struct sockaddr_in *)rt_key_const(rt);
	KASSERT((dst->sin_family == AF_INET),
	    ("rt family is %d, not inet", dst->sin_family));
	*paddr = dst->sin_addr;
	dst = (const struct sockaddr_in *)rt_mask_const(rt);
	if (dst == NULL)
		pmask->s_addr = INADDR_BROADCAST;
	else
		*pmask = dst->sin_addr;
	*pscopeid = 0;
}
#endif

#ifdef INET6