/****************************************************************************
 * net/route/net_del_ramroute.c
 *
 *   Copyright (C) 2013, 2015, 2017 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 <debug.h>

#include <arpa/inet.h>
#include <nuttx/net/ip.h>

#include "route/ramroute.h"
#include "route/route.h"

#if defined(CONFIG_ROUTE_IPv4_RAMROUTE) || defined(CONFIG_ROUTE_IPv6_RAMROUTE)

/****************************************************************************
 * Public Types
 ****************************************************************************/

#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
struct route_match_s
{
  FAR struct net_route_ipv4_s *prev;     /* Predecessor in the list */
  in_addr_t               target;   /* The target IP address to match */
  in_addr_t               netmask;  /* The network mask to match */
};
#endif

#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
struct route_match_ipv6_s
{
  FAR struct net_route_ipv6_s *prev;     /* Predecessor in the list */
  net_ipv6addr_t               target;   /* The target IP address to match */
  net_ipv6addr_t               netmask;  /* The network mask to match */
};
#endif

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: net_match_ipv4
 *
 * 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.
 *
 ****************************************************************************/

#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
static int net_match_ipv4(FAR struct net_route_ipv4_s *route, FAR void *arg)
{
  FAR struct route_match_s *match = (FAR struct route_match_s *)arg;

  /* To match, the masked target address must be the same, and the masks
   * must be the same.
   */

  net_ipv4_dumproute("Comparing", route);
  ninfo("With:\n");
  ninfo("  target=%08lx netmask=%08lx\n",
        htonl(match->target), htonl(match->netmask));

  if (net_ipv4addr_maskcmp(route->target, match->target, match->netmask) &&
      net_ipv4addr_cmp(route->netmask, match->netmask))
    {
      /* They match.. Remove the entry from the routing table */

      if (match->prev)
        {
          (void)ramroute_ipv4_remafter((FAR struct net_route_ipv4_entry_s *)match->prev,
                                       &g_ipv4_routes);
        }
      else
        {
          (void)ramroute_ipv4_remfirst(&g_ipv4_routes);
        }

      /* And free the routing table entry by adding it to the free list */

      net_freeroute_ipv4(route);

      /* Return a non-zero value to terminate the traversal */

      return 1;
    }

  /* Next time we are here, this will be the previous entry */

  match->prev = route;
  return 0;
}
#endif

#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
static int net_match_ipv6(FAR struct net_route_ipv6_s *route, FAR void *arg)
{
  FAR struct route_match_ipv6_s *match = (FAR struct route_match_ipv6_s *)arg;

  /* To match, the masked target address must be the same, and the masks
   * must be the same.
   */

  net_ipv6_dumproute("Comparing", route);
  ninfo("With:\n");
  ninfo("  target:  %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
        htons(match->target[0]),  htons(match->target[1]),
        htons(match->target[2]),  htons(match->target[3]),
        htons(match->target[4]),  htons(match->target[5]),
        htons(match->target[6]),  htons(match->target[7]));
  ninfo("  netmask: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
        htons(match->netmask[0]), htons(match->netmask[1]),
        htons(match->netmask[2]), htons(match->netmask[3]),
        htons(match->netmask[4]), htons(match->netmask[5]),
        htons(match->netmask[6]), htons(match->netmask[7]));

  if (net_ipv6addr_maskcmp(route->target, match->target, match->netmask) &&
      net_ipv6addr_cmp(route->netmask, match->netmask))
    {
      /* They match.. Remove the entry from the routing table */

      if (match->prev)
        {
          (void)ramroute_ipv6_remafter((FAR struct net_route_ipv6_entry_s *)match->prev,
                                        &g_ipv6_routes);
        }
      else
        {
          (void)ramroute_ipv6_remfirst(&g_ipv6_routes);
        }

      /* And free the routing table entry by adding it to the free list */

      net_freeroute_ipv6(route);

      /* Return a non-zero value to terminate the traversal */

      return 1;
    }

  /* Next time we are here, this will be the previous entry */

  match->prev = route;
  return 0;
}
#endif

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: net_delroute_ipv4 and net_delroute_ipv6
 *
 * Description:
 *   Remove an existing route from the routing table
 *
 * Parameters:
 *
 * Returned Value:
 *   OK on success; Negated errno on failure.
 *
 ****************************************************************************/

#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
int net_delroute_ipv4(in_addr_t target, in_addr_t netmask)
{
  struct route_match_s match;

  /* Set up the comparison structure */

  match.prev = NULL;
  net_ipv4addr_copy(match.target, target);
  net_ipv4addr_copy(match.netmask, netmask);

  /* Then remove the entry from the routing table */

  return net_foreachroute_ipv4(net_match_ipv4, &match) ? OK : -ENOENT;
}
#endif

#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
int net_delroute_ipv6(net_ipv6addr_t target, net_ipv6addr_t netmask)
{
  struct route_match_ipv6_s match;

  /* Set up the comparison structure */

  match.prev = NULL;
  net_ipv6addr_copy(match.target, target);
  net_ipv6addr_copy(match.netmask, netmask);

  /* Then remove the entry from the routing table */

  return net_foreachroute_ipv6(net_match_ipv6, &match) ? OK : -ENOENT;
}
#endif

#endif /* CONFIG_ROUTE_IPv4_RAMROUTE || CONFIG_ROUTE_IPv6_RAMROUTE  */