/****************************************************************************
* net/route/net_router.c
*
* Copyright (C) 2013-2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#include <nuttx/net/ip.h>
#include "devif/devif.h"
#include "route/route.h"
#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE)
/****************************************************************************
* Public Types
****************************************************************************/
#ifdef CONFIG_NET_IPv4
struct route_ipv4_match_s
{
in_addr_t target; /* Target IPv4 address on an external network to match */
in_addr_t router; /* IPv4 address of the router on one of our networks */
};
#endif
#ifdef CONFIG_NET_IPv6
struct route_ipv6_match_s
{
net_ipv6addr_t target; /* Target IPv6 address on an external network to match */
net_ipv6addr_t router; /* IPv6 address of the router on one of our networks */
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: net_ipv4_match
*
* Description:
* Return 1 if the IPv4 route is available
*
* Parameters:
* route - The next route to examine
* arg - The match values (cast to void*)
*
* Returned Value:
* 0 if the entry is not a match; 1 if the entry matched and was cleared.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
static int net_ipv4_match(FAR struct net_route_ipv4_s *route, FAR void *arg)
{
FAR struct route_ipv4_match_s *match = (FAR struct route_ipv4_match_s *)arg;
/* To match, the masked target addresses must be the same. In the event
* of multiple matches, only the first is returned. There is not (yet) any
* concept for the precedence of networks.
*/
if (net_ipv4addr_maskcmp(route->target, match->target, route->netmask))
{
/* They match.. Copy the router address */
net_ipv4addr_copy(match->router, route->router);
return 1;
}
return 0;
}
#endif /* CONFIG_NET_IPv4 */
/****************************************************************************
* Name: net_ipv6_match
*
* Description:
* Return 1 if the IPv6 route is available
*
* Parameters:
* route - The next route to examine
* arg - The match values (cast to void*)
*
* Returned Value:
* 0 if the entry is not a match; 1 if the entry matched and was cleared.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
static int net_ipv6_match(FAR struct net_route_ipv6_s *route, FAR void *arg)
{
FAR struct route_ipv6_match_s *match = (FAR struct route_ipv6_match_s *)arg;
/* To match, the masked target addresses must be the same. In the event
* of multiple matches, only the first is returned. There is not (yet) any
* concept for the precedence of networks.
*/
if (net_ipv6addr_maskcmp(route->target, match->target, route->netmask))
{
/* They match.. Copy the router address */
net_ipv6addr_copy(match->router, route->router);
return 1;
}
return 0;
}
#endif /* CONFIG_NET_IPv6 */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: net_ipv4_router
*
* Description:
* Given an IPv4 address on a external network, return the address of the
* router on a local network that can forward to the external network.
*
* Parameters:
* target - An IPv4 address on a remote network to use in the lookup.
* router - The address of router on a local network that can forward our
* packets to the target.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
int net_ipv4_router(in_addr_t target, FAR in_addr_t *router)
{
struct route_ipv4_match_s match;
int ret;
/* Do not route the special broadcast IP address */
if (net_ipv4addr_cmp(target, INADDR_BROADCAST))
{
return -ENOENT;
}
/* Set up the comparison structure */
memset(&match, 0, sizeof(struct route_ipv4_match_s));
net_ipv4addr_copy(match.target, target);
/* Find an router entry with the routing table that can forward to this
* address
*/
ret = net_foreachroute_ipv4(net_ipv4_match, &match);
if (ret > 0)
{
/* We found a route. Return the router address. */
net_ipv4addr_copy(*router, match.router);
ret = OK;
}
else
{
/* There is no route for this address */
ret = -ENOENT;
}
return ret;
}
#endif /* CONFIG_NET_IPv4 */
/****************************************************************************
* Name: net_ipv6_router
*
* Description:
* Given an IPv6 address on a external network, return the address of the
* router on a local network that can forward to the external network.
*
* Parameters:
* target - An IPv6 address on a remote network to use in the lookup.
* router - The address of router on a local network that can forward our
* packets to the target.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
int net_ipv6_router(const net_ipv6addr_t target, net_ipv6addr_t router)
{
struct route_ipv6_match_s match;
int ret;
/* Do not route to any the special IPv6 multicast addresses */
if (target[0] == HTONS(0xff02))
{
return -ENOENT;
}
/* Set up the comparison structure */
memset(&match, 0, sizeof(struct route_ipv6_match_s));
net_ipv6addr_copy(match.target, target);
/* Find an router entry with the routing table that can forward to this
* address
*/
ret = net_foreachroute_ipv6(net_ipv6_match, &match);
if (ret > 0)
{
/* We found a route. Return the router address. */
net_ipv6addr_copy(router, match.router);
ret = OK;
}
else
{
/* There is no route for this address */
ret = -ENOENT;
}
return ret;
}
#endif /* CONFIG_NET_IPv6 */
#endif /* CONFIG_NET && CONFIG_NET_ROUTE */