Exemple #1
0
/*
 * Do what we need to do when inserting a route.
 */
static struct radix_node *
in6_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
	    struct radix_node *treenodes)
{
	struct rtentry *rt = (struct rtentry *)treenodes;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)rt_key(rt);
	struct radix_node *ret;

	lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_OWNED);
	RT_LOCK_ASSERT_HELD(rt);

	/*
	 * If this is a dynamic route (which is created via Redirect) and
	 * we already have the maximum acceptable number of such route entries,
	 * reject creating a new one.  We could initiate garbage collection to
	 * make available space right now, but the benefit would probably not
	 * be worth the cleaning overhead; we only have to endure a slightly
	 * suboptimal path even without the redirecbted route.
	 */
	if ((rt->rt_flags & RTF_DYNAMIC) != 0 &&
	    ip6_maxdynroutes >= 0 && in6dynroutes >= ip6_maxdynroutes)
		return (NULL);

	/*
	 * For IPv6, all unicast non-host routes are automatically cloning.
	 */
	if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
		rt->rt_flags |= RTF_MULTICAST;

	if (!(rt->rt_flags & (RTF_HOST | RTF_CLONING | RTF_MULTICAST))) {
		rt->rt_flags |= RTF_PRCLONING;
	}

	/*
	 * A little bit of help for both IPv6 output and input:
	 *   For local addresses, we make sure that RTF_LOCAL is set,
	 *   with the thought that this might one day be used to speed up
	 *   ip_input().
	 *
	 * We also mark routes to multicast addresses as such, because
	 * it's easy to do and might be useful (but this is much more
	 * dubious since it's so easy to inspect the address).  (This
	 * is done above.)
	 *
	 * XXX
	 * should elaborate the code.
	 */
	if (rt->rt_flags & RTF_HOST) {
		if (IN6_ARE_ADDR_EQUAL(&satosin6(rt->rt_ifa->ifa_addr)
					->sin6_addr,
				       &sin6->sin6_addr)) {
			rt->rt_flags |= RTF_LOCAL;
		}
	}

	if (!rt->rt_rmx.rmx_mtu && !(rt->rt_rmx.rmx_locks & RTV_MTU)
	    && rt->rt_ifp)
		rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;

	ret = rn_addroute(v_arg, n_arg, head, treenodes);
	if (ret == NULL && (rt->rt_flags & RTF_HOST)) {
		struct rtentry *rt2;
		/*
		 * We are trying to add a host route, but can't.
		 * Find out if it is because of an
		 * ARP entry and delete it if so.
		 */
		rt2 = rtalloc1_locked((struct sockaddr *)sin6, 0,
				RTF_CLONING | RTF_PRCLONING);
		if (rt2) {
			RT_LOCK(rt2);
			if ((rt2->rt_flags & RTF_LLINFO) &&
			    (rt2->rt_flags & RTF_HOST) &&
			    rt2->rt_gateway != NULL &&
			    rt2->rt_gateway->sa_family == AF_LINK) {
				/*
				 * Safe to drop rt_lock and use rt_key,
				 * rt_gateway, since holding rnh_lock here
				 * prevents another thread from calling
				 * rt_setgate() on this route.
				 */
				RT_UNLOCK(rt2);
				(void) rtrequest_locked(RTM_DELETE, rt_key(rt2),
				    rt2->rt_gateway, rt_mask(rt2),
				    rt2->rt_flags, 0);
				ret = rn_addroute(v_arg, n_arg, head,
					treenodes);
			} else {
				RT_UNLOCK(rt2);
			}
			rtfree_locked(rt2);
		}
	} else if (ret == NULL && (rt->rt_flags & RTF_CLONING)) {
		struct rtentry *rt2;
		/*
		 * We are trying to add a net route, but can't.
		 * The following case should be allowed, so we'll make a
		 * special check for this:
		 *	Two IPv6 addresses with the same prefix is assigned
		 *	to a single interrface.
		 *	# ifconfig if0 inet6 3ffe:0501::1 prefix 64 alias (*1)
		 *	# ifconfig if0 inet6 3ffe:0501::2 prefix 64 alias (*2)
		 *	In this case, (*1) and (*2) want to add the same
		 *	net route entry, 3ffe:0501:: -> if0.
		 *	This case should not raise an error.
		 */
		rt2 = rtalloc1_locked((struct sockaddr *)sin6, 0,
				RTF_CLONING | RTF_PRCLONING);
		if (rt2) {
			RT_LOCK(rt2);
			if ((rt2->rt_flags & (RTF_CLONING|RTF_HOST|RTF_GATEWAY))
					== RTF_CLONING
			 && rt2->rt_gateway
			 && rt2->rt_gateway->sa_family == AF_LINK
			 && rt2->rt_ifp == rt->rt_ifp) {
				ret = rt2->rt_nodes;
			}
			RT_UNLOCK(rt2);
			rtfree_locked(rt2);
		}
	}

	if (ret != NULL && (rt->rt_flags & RTF_DYNAMIC) != 0)
		in6dynroutes++;

	return ret;
}
Exemple #2
0
/*
 * Do what we need to do when inserting a route.
 */
static struct radix_node *
in_addroute(void *v_arg, void *n_arg, struct radix_node_head *head,
	    struct radix_node *treenodes)
{
	struct rtentry *rt = (struct rtentry *)treenodes;
	struct sockaddr_in *sin = (struct sockaddr_in *)rt_key(rt);
	struct radix_node *ret;

	/*
	 * For IP, all unicast non-host routes are automatically cloning.
	 */
	if(IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
		rt->rt_flags |= RTF_MULTICAST;

	if(!(rt->rt_flags & (RTF_HOST | RTF_CLONING | RTF_MULTICAST))) {
		rt->rt_flags |= RTF_PRCLONING;
	}

	/*
	 * A little bit of help for both IP output and input:
	 *   For host routes, we make sure that RTF_BROADCAST
	 *   is set for anything that looks like a broadcast address.
	 *   This way, we can avoid an expensive call to in_broadcast()
	 *   in ip_output() most of the time (because the route passed
	 *   to ip_output() is almost always a host route).
	 *
	 *   We also do the same for local addresses, with the thought
	 *   that this might one day be used to speed up ip_input().
	 *
	 * We also mark routes to multicast addresses as such, because
	 * it's easy to do and might be useful (but this is much more
	 * dubious since it's so easy to inspect the address).  (This
	 * is done above.)
	 */
	if (rt->rt_flags & RTF_HOST) {
		if (in_broadcast(sin->sin_addr, rt->rt_ifp)) {
			rt->rt_flags |= RTF_BROADCAST;
		} else {
#define satosin(sa) ((struct sockaddr_in *)sa)
			if (satosin(rt->rt_ifa->ifa_addr)->sin_addr.s_addr
			    == sin->sin_addr.s_addr)
				rt->rt_flags |= RTF_LOCAL;
#undef satosin
		}
	}

	if (!rt->rt_rmx.rmx_mtu && !(rt->rt_rmx.rmx_locks & RTV_MTU) 
	    && rt->rt_ifp)
		rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;

	ret = rn_addroute(v_arg, n_arg, head, treenodes);
	if (ret == NULL && rt->rt_flags & RTF_HOST) {
		struct rtentry *rt2;
		/*
		 * We are trying to add a host route, but can't.
		 * Find out if it is because of an
		 * ARP entry and delete it if so.
		 */
		rt2 = rtalloc1_locked((struct sockaddr *)sin, 0,
				RTF_CLONING | RTF_PRCLONING);
		if (rt2) {
			if (rt2->rt_flags & RTF_LLINFO &&
				rt2->rt_flags & RTF_HOST &&
				rt2->rt_gateway &&
				rt2->rt_gateway->sa_family == AF_LINK) {
				rtrequest_locked(RTM_DELETE,
					  (struct sockaddr *)rt_key(rt2),
					  rt2->rt_gateway,
					  rt_mask(rt2), rt2->rt_flags, 0);
				ret = rn_addroute(v_arg, n_arg, head,
					treenodes);
			}
			rtfree_locked(rt2);
		}
	}
	return ret;
}