1 files changed, 144 insertions, 0 deletions
diff --git a/nuttx/net/net_router.c b/nuttx/net/net_router.c
new file mode 100644
index 000000000..3317f4006
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+++ b/nuttx/net/net_router.c
@@ -0,0 +1,144 @@
+/****************************************************************************
+ * net/net_router.c
+ *
+ *   Copyright (C) 2013 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 "net_internal.h"
+#include "net_route.h"
+
+#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE)
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct route_match_s
+{
+  uip_ipaddr_t target;   /* The target IP address on an external network to match */
+  uip_ipaddr_t router;   /* The IP address of the router on one of our networks*/
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: net_match
+ *
+ * Description:
+ *   Return 1 if the 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.
+ *
+ ****************************************************************************/
+
+static int net_match(FAR struct net_route_s *route, FAR void *arg)
+{
+  FAR struct route_match_s *match = ( FAR struct route_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 not (yet) any
+   * concept for the precedence of networks.
+   */
+
+  if (uip_ipaddr_maskcmp(route->target, match->target, route->netmask))
+    {
+      /* They match.. Copy the router address */
+
+      uip_ipaddr_copy(match->router, route->router);
+      return 1;
+    }
+
+  return 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: net_router
+ *
+ * Description:
+ *   Given an IP address on a external network, return the address of the
+ *   router on a local network that can forward to the external network.
+ *
+ * Parameters:
+ *
+ * Returned Value:
+ *   OK on success; Negated errno on failure.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_IPv6
+int net_router(uip_ipaddr_t target, uip_ipaddr_t *router)
+#else
+int net_router(uip_ipaddr_t target, uip_ipaddr_t router)
+#endif
+{
+  struct route_match_s match;
+  int ret;
+
+  /* Set up the comparison structure */
+
+  memset(&match, 0, sizeof(struct route_match_s));
+  uip_ipaddr_copy(match.target, target);
+
+  /* Then remove the entry from the routing table */
+
+  ret = net_foreachroute(net_match, &match) ? OK : -ENOENT;
+#ifdef CONFIG_NET_IPv6
+  uip_ipaddr_copy(*router, match.target);
+#else
+  uip_ipaddr_copy(router, match.target);
+#endif
+
+  return ret;
+}
+
+#endif /* CONFIG_NET && CONFIG_NET_ROUTE */