Function in6_addrscope

freebsd/netinet6/scope6.c:228–247

* Get a scope of the address. Node-local, link-local, site-local or global. */

 * Get a scope of the address. Node-local, link-local, site-local or global.
 */
int
in6_addrscope(const struct in6_addr *addr)
{

	if (IN6_IS_ADDR_MULTICAST(addr)) {
		/*
		 * Addresses with reserved value F must be treated as
		 * global multicast addresses.
		 */
		if (IPV6_ADDR_MC_SCOPE(addr) == 0x0f)
			return (IPV6_ADDR_SCOPE_GLOBAL);
		return (IPV6_ADDR_MC_SCOPE(addr));
	}
	if (IN6_IS_ADDR_LINKLOCAL(addr) ||
	    IN6_IS_ADDR_LOOPBACK(addr))
		return (IPV6_ADDR_SCOPE_LINKLOCAL);
	if (IN6_IS_ADDR_SITELOCAL(addr))
		return (IPV6_ADDR_SCOPE_SITELOCAL);
	return (IPV6_ADDR_SCOPE_GLOBAL);
}

/*
 * ifp - note that this might be NULL