/**************************************************************************** * net/route/net_router.c * * Copyright (C) 2013-2015, 2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include "devif/devif.h" #include "route/cacheroute.h" #include "route/route.h" #if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE) /**************************************************************************** * Pre-processor defintions ****************************************************************************/ #ifdef CONFIG_ROUTE_IPv6_CACHEROUTE # define IPv4_ROUTER entry.router #else # define IPv4_ROUTER router #endif #ifdef CONFIG_ROUTE_IPv6_CACHEROUTE # define IPv6_ROUTER entry.router #else # define IPv6_ROUTER router #endif /**************************************************************************** * Public Types ****************************************************************************/ #ifdef CONFIG_NET_IPv4 struct route_ipv4_match_s { in_addr_t target; /* Target IPv4 address on remote network */ #ifdef CONFIG_ROUTE_IPv4_CACHEROUTE struct net_route_ipv4_s entry; /* Full entry from the IPv4 routing table */ #else in_addr_t router; /* IPv4 address of router a local networks */ #endif }; #endif #ifdef CONFIG_NET_IPv6 struct route_ipv6_match_s { net_ipv6addr_t target; /* Target IPv6 address on remote network */ #ifdef CONFIG_ROUTE_IPv6_CACHEROUTE struct net_route_ipv6_s entry; /* Full entry from the IPv6 routing table */ #else net_ipv6addr_t router; /* IPv6 address of router a local networks */ #endif }; #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: net_ipv4_match * * Description: * Return 1 if the IPv4 route is available * * Input 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)) { #ifdef CONFIG_ROUTE_IPv4_CACHEROUTE /* They match.. Copy the entire routing table entry */ memcpy(&match->entry, route, sizeof(struct net_route_ipv4_s)); #else /* They match.. Copy the router address */ net_ipv4addr_copy(match->router, route->router); #endif return 1; } return 0; } #endif /* CONFIG_NET_IPv4 */ /**************************************************************************** * Name: net_ipv6_match * * Description: * Return 1 if the IPv6 route is available * * Input 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)) { #ifdef CONFIG_ROUTE_IPv6_CACHEROUTE /* They match.. Copy the entire routing table entry */ memcpy(&match->entry, route, sizeof(struct net_route_ipv6_s)); #else /* They match.. Copy the router address */ net_ipv6addr_copy(match->router, route->router); #endif 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. * * Input 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); #ifdef CONFIG_ROUTE_IPv4_CACHEROUTE /* First see if we can find a router entry in the cache */ ret = net_foreachcache_ipv4(net_ipv4_match, &match); if (ret <= 0) #endif { /* Not found in the cache. Try to find a router entry with the * routing table that can forward to this address */ ret = net_foreachroute_ipv4(net_ipv4_match, &match); } /* Did we find a route? */ if (ret <= 0) { /* No.. there is no route for this address */ return -ENOENT; } /* We found a route. */ #ifdef CONFIG_ROUTE_IPv4_CACHEROUTE /* Add the route to the cache. If the route is already in the cache, this * will update it to the most recently accessed. */ (void)net_addcache_ipv4(&match.entry); #endif /* Return the router address. */ net_ipv4addr_copy(*router, match.IPv4_ROUTER); return OK; } #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. * * Input 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); #ifdef CONFIG_ROUTE_IPv6_CACHEROUTE /* First see if we can find a router entry in the cache */ ret = net_foreachcache_ipv6(net_ipv6_match, &match); if (ret <= 0) #endif { /* Not found in the cache. Try to find a router entry with the * routing table that can forward to this address */ ret = net_foreachroute_ipv6(net_ipv6_match, &match); } /* Did we find a route? */ if (ret <= 0) { /* No.. there is no route for this address */ return -ENOENT; } /* We found a route. */ #ifdef CONFIG_ROUTE_IPv6_CACHEROUTE /* Add the route to the cache. If the route is already in the cache, this * will update it to the most recently accessed. */ (void)net_addcache_ipv6(&match.entry); #endif /* Return the router address. */ net_ipv6addr_copy(router, match.IPv6_ROUTER); return OK; } #endif /* CONFIG_NET_IPv6 */ #endif /* CONFIG_NET && CONFIG_NET_ROUTE */