/****************************************************************************
 * net/route/ramroute.h
 *
 *   Copyright (C) 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.
 *
 ****************************************************************************/

#ifndef __NET_ROUTE_RAMROUTE_H
#define __NET_ROUTE_RAMROUTE_H 1

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include "route/route.h"

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

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* Configuration ************************************************************/

#ifndef CONFIG_ROUTE_MAX_IPv4_RAMROUTES
#  define CONFIG_ROUTE_MAX_IPv4_RAMROUTES 4
#endif

#ifndef CONFIG_ROUTE_MAX_IPv6_RAMROUTES
#  define CONFIG_ROUTE_MAX_IPv6_RAMROUTES 4
#endif

/* Routing table initializer */

#define ramroute_init(rr) \
  do \
    { \
      (rr)->head = NULL; \
      (rr)->tail = NULL; \
    } \
  while (0) \

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

#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
/* This structure describes one entry in the routing table */

struct net_route_ipv4_entry_s
{
  struct net_route_ipv4_s entry;
  FAR struct net_route_ipv4_entry_s *flink;
};

/* This structure describes the head of a routing table list */

struct net_route_ipv4_queue_s
{
  FAR struct net_route_ipv4_entry_s *head;
  FAR struct net_route_ipv4_entry_s *tail;
};
#endif

#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
/* This structure describes one entry in the routing table */

struct net_route_ipv6_entry_s
{
  struct net_route_ipv6_s entry;
  FAR struct net_route_ipv6_entry_s *flink;
};

/* This structure describes the head of a routing table list */

struct net_route_ipv6_queue_s
{
  FAR struct net_route_ipv6_entry_s *head;
  FAR struct net_route_ipv6_entry_s *tail;
};
#endif

/****************************************************************************
 * Public Data
 ****************************************************************************/

/* These are the routing tables */

#if defined(CONFIG_ROUTE_IPv4_RAMROUTE)
/* The in-memory routing tables are represented as singly linked lists. */

extern struct net_route_ipv4_queue_s g_ipv4_routes;
#endif

#if defined(CONFIG_ROUTE_IPv6_RAMROUTE)
/* The in-memory routing tables are represented as singly linked lists. */

extern struct net_route_ipv6_queue_s g_ipv6_routes;
#endif

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: net_init_ramroute
 *
 * Description:
 *   Initialize the in-memory, RAM routing table
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   None
 *
 * Assumptions:
 *   Called early in initialization so that no special protection is needed.
 *
 ****************************************************************************/

void net_init_ramroute(void);

/****************************************************************************
 * Name: net_allocroute_ipv4 and net_allocroute_ipv6
 *
 * Description:
 *   Allocate one route by removing it from the free list
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   On success, a pointer to the newly allocated routing table entry is
 *   returned; NULL is returned on failure.
 *
 ****************************************************************************/

#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
FAR struct net_route_ipv4_s *net_allocroute_ipv4(void);
#endif

#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
FAR struct net_route_ipv6_s *net_allocroute_ipv6(void);
#endif

/****************************************************************************
 * Name: net_freeroute_ipv4 and net_freeroute_ipv6
 *
 * Description:
 *   Free one route by adding it from the free list
 *
 * Input Parameters:
 *   route - The route to be freed
 *
 * Returned Value:
 *   None
 *
 ****************************************************************************/

#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
void net_freeroute_ipv4(FAR struct net_route_ipv4_s *route);
#endif

#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
void net_freeroute_ipv6(FAR struct net_route_ipv6_s *route);
#endif

/****************************************************************************
 * Name: (various low-level list operations)
 *
 * Description:
 *   Perform operations on in-memory routing table lists 
 *
 * Input Parameters:
 *   entry - A pointer to the new entry to add to the list
 *   list - The list to be used.
 *
 * Returned Value:
 *   None
 *
 ****************************************************************************/

#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
void ramroute_ipv4_addlast(FAR struct net_route_ipv4_entry_s *entry,
                           FAR struct net_route_ipv4_queue_s *list);
FAR struct net_route_ipv4_entry_s *
  ramroute_ipv4_remfirst(struct net_route_ipv4_queue_s *list);
FAR struct net_route_ipv4_entry_s *
  ramroute_ipv4_remafter(FAR struct net_route_ipv4_entry_s *entry,
                         FAR struct net_route_ipv4_queue_s *list);
#endif

#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
void ramroute_ipv6_addlast(FAR struct net_route_ipv6_entry_s *entry,
                           FAR struct net_route_ipv6_queue_s *list);
FAR struct net_route_ipv6_entry_s *
  ramroute_ipv6_remfirst(struct net_route_ipv6_queue_s *list);
FAR struct net_route_ipv6_entry_s *
  ramroute_ipv6_remafter(FAR struct net_route_ipv6_entry_s *entry,
  struct net_route_ipv6_queue_s *list);
#endif

#endif /* CONFIG_ROUTE_IPv4_RAMROUTE || CONFIG_ROUTE_IPv6_RAMROUTE */
#endif /* __NET_ROUTE_RAMROUTE_H */