274 lines
8.2 KiB
C
274 lines
8.2 KiB
C
/****************************************************************************
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* net/route/net_router.c
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*
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* Copyright (C) 2013-2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <nuttx/net/ip.h>
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#include "devif/devif.h"
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#include "route/route.h"
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#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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struct route_ipv4_match_s
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{
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in_addr_t target; /* Target IPv4 address on an external network to match */
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in_addr_t router; /* IPv4 address of the router on one of our networks */
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};
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#endif
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#ifdef CONFIG_NET_IPv6
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struct route_ipv6_match_s
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{
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net_ipv6addr_t target; /* Target IPv6 address on an external network to match */
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net_ipv6addr_t router; /* IPv6 address of the router on one of our networks */
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};
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: net_ipv4_match
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*
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* Description:
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* Return 1 if the IPv4 route is available
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*
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* Parameters:
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* route - The next route to examine
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* arg - The match values (cast to void*)
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*
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* Returned Value:
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* 0 if the entry is not a match; 1 if the entry matched and was cleared.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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static int net_ipv4_match(FAR struct net_route_s *route, FAR void *arg)
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{
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FAR struct route_ipv4_match_s *match = (FAR struct route_ipv4_match_s *)arg;
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/* To match, the masked target addresses must be the same. In the event
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* of multiple matches, only the first is returned. There is not (yet) any
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* concept for the precedence of networks.
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*/
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if (net_ipv4addr_maskcmp(route->target, match->target, route->netmask))
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{
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/* They match.. Copy the router address */
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net_ipv4addr_copy(match->router, route->router);
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return 1;
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}
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return 0;
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}
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#endif /* CONFIG_NET_IPv4 */
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/****************************************************************************
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* Function: net_ipv6_match
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*
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* Description:
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* Return 1 if the IPv6 route is available
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*
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* Parameters:
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* route - The next route to examine
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* arg - The match values (cast to void*)
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*
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* Returned Value:
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* 0 if the entry is not a match; 1 if the entry matched and was cleared.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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static int net_ipv6_match(FAR struct net_route_ipv6_s *route, FAR void *arg)
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{
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FAR struct route_ipv6_match_s *match = (FAR struct route_ipv6_match_s *)arg;
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/* To match, the masked target addresses must be the same. In the event
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* of multiple matches, only the first is returned. There is not (yet) any
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* concept for the precedence of networks.
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*/
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if (net_ipv6addr_maskcmp(route->target, match->target, route->netmask))
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{
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/* They match.. Copy the router address */
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net_ipv6addr_copy(match->router, route->router);
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return 1;
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}
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return 0;
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}
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#endif /* CONFIG_NET_IPv6 */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: net_ipv4_router
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*
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* Description:
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* Given an IPv4 address on a external network, return the address of the
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* router on a local network that can forward to the external network.
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*
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* Parameters:
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* target - An IPv4 address on a remote network to use in the lookup.
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* router - The address of router on a local network that can forward our
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* packets to the target.
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*
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* Returned Value:
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* OK on success; Negated errno on failure.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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int net_ipv4_router(in_addr_t target, FAR in_addr_t *router)
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{
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struct route_ipv4_match_s match;
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int ret;
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/* Do not route the special broadcast IP address */
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if (net_ipv4addr_cmp(target, INADDR_BROADCAST))
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{
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return -ENOENT;
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}
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/* Set up the comparison structure */
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memset(&match, 0, sizeof(struct route_ipv4_match_s));
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net_ipv4addr_copy(match.target, target);
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/* Find an router entry with the routing table that can forward to this
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* address
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*/
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ret = net_foreachroute(net_ipv4_match, &match);
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if (ret > 0)
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{
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/* We found a route. Return the router address. */
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net_ipv4addr_copy(*router, match.router);
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ret = OK;
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}
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else
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{
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/* There is no route for this address */
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ret = -ENOENT;
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}
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return ret;
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}
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#endif /* CONFIG_NET_IPv4 */
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/****************************************************************************
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* Function: net_ipv6_router
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*
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* Description:
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* Given an IPv6 address on a external network, return the address of the
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* router on a local network that can forward to the external network.
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*
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* Parameters:
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* target - An IPv6 address on a remote network to use in the lookup.
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* router - The address of router on a local network that can forward our
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* packets to the target.
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*
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* Returned Value:
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* OK on success; Negated errno on failure.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv6
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int net_ipv6_router(net_ipv6addr_t target, net_ipv6addr_t router)
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{
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struct route_ipv6_match_s match;
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int ret;
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/* Do not route the special broadcast IP address */
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if (net_ipv6addr_cmp(target, g_ipv6_alloneaddr))
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{
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return -ENOENT;
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}
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/* Set up the comparison structure */
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memset(&match, 0, sizeof(struct route_ipv6_match_s));
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net_ipv6addr_copy(match.target, target);
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/* Find an router entry with the routing table that can forward to this
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* address
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*/
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ret = net_foreachroute_ipv6(net_ipv6_match, &match);
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if (ret > 0)
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{
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/* We found a route. Return the router address. */
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net_ipv6addr_copy(router, match.router);
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ret = OK;
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}
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else
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{
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/* There is no route for this address */
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ret = -ENOENT;
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}
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return ret;
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}
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#endif /* CONFIG_NET_IPv6 */
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#endif /* CONFIG_NET && CONFIG_NET_ROUTE */
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