/*
 * RIPngd and zebra interface.
 * Copyright (C) 1998, 1999 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.  
 */

#include <zebra.h>

#include "command.h"
#include "prefix.h"
#include "stream.h"
#include "routemap.h"
#include "zclient.h"
#include "log.h"

#include "ripngd/ripngd.h"

/* All information about zebra. */
struct zclient *zclient = NULL;

/* Callback prototypes for zebra client service. */
int ripng_interface_up (int, struct zclient *, zebra_size_t);
int ripng_interface_down (int, struct zclient *, zebra_size_t);
int ripng_interface_add (int, struct zclient *, zebra_size_t);
int ripng_interface_delete (int, struct zclient *, zebra_size_t);
int ripng_interface_address_add (int, struct zclient *, zebra_size_t);
int ripng_interface_address_delete (int, struct zclient *, zebra_size_t);

void
ripng_zebra_ipv6_add (struct prefix_ipv6 *p, struct in6_addr *nexthop,
		      unsigned int ifindex, u_char metric)
{
  struct zapi_ipv6 api;

  if (zclient->redist[ZEBRA_ROUTE_RIPNG])
    {
      api.type = ZEBRA_ROUTE_RIPNG;
      api.flags = 0;
      api.message = 0;
      SET_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP);
      api.nexthop_num = 1;
      api.nexthop = &nexthop;
      SET_FLAG (api.message, ZAPI_MESSAGE_IFINDEX);
      api.ifindex_num = 1;
      api.ifindex = &ifindex;
      SET_FLAG (api.message, ZAPI_MESSAGE_METRIC);
      api.metric = metric;
      
      zapi_ipv6_route (ZEBRA_IPV6_ROUTE_ADD, zclient, p, &api);
    }
}

void
ripng_zebra_ipv6_delete (struct prefix_ipv6 *p, struct in6_addr *nexthop,
			 unsigned int ifindex)
{
  struct zapi_ipv6 api;

  if (zclient->redist[ZEBRA_ROUTE_RIPNG])
    {
      api.type = ZEBRA_ROUTE_RIPNG;
      api.flags = 0;
      api.message = 0;
      SET_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP);
      api.nexthop_num = 1;
      api.nexthop = &nexthop;
      SET_FLAG (api.message, ZAPI_MESSAGE_IFINDEX);
      api.ifindex_num = 1;
      api.ifindex = &ifindex;

      zapi_ipv6_route (ZEBRA_IPV6_ROUTE_DELETE, zclient, p, &api);
    }
}

/* Zebra route add and delete treatment. */
static int
ripng_zebra_read_ipv6 (int command, struct zclient *zclient,
		       zebra_size_t length)
{
  struct stream *s;
  struct zapi_ipv6 api;
  unsigned long ifindex;
  struct in6_addr nexthop;
  struct prefix_ipv6 p;

  s = zclient->ibuf;
  ifindex = 0;
  memset (&nexthop, 0, sizeof (struct in6_addr));

  /* Type, flags, message. */
  api.type = stream_getc (s);
  api.flags = stream_getc (s);
  api.message = stream_getc (s);

  /* IPv6 prefix. */
  memset (&p, 0, sizeof (struct prefix_ipv6));
  p.family = AF_INET6;
  p.prefixlen = stream_getc (s);
  stream_get (&p.prefix, s, PSIZE (p.prefixlen));

  /* Nexthop, ifindex, distance, metric. */
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_NEXTHOP))
    {
      api.nexthop_num = stream_getc (s);
      stream_get (&nexthop, s, 16);
    }
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_IFINDEX))
    {
      api.ifindex_num = stream_getc (s);
      ifindex = stream_getl (s);
    }
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_DISTANCE))
    api.distance = stream_getc (s);
  else
    api.distance = 0;
  if (CHECK_FLAG (api.message, ZAPI_MESSAGE_METRIC))
    api.metric = stream_getl (s);
  else
    api.metric = 0;

  if (command == ZEBRA_IPV6_ROUTE_ADD)
    ripng_redistribute_add (api.type, RIPNG_ROUTE_REDISTRIBUTE, &p, ifindex, &nexthop);
  else
    ripng_redistribute_delete (api.type, RIPNG_ROUTE_REDISTRIBUTE, &p, ifindex);

  return 0;
}

void
ripng_zclient_reset (void)
{
  zclient_reset (zclient);
}

static int
ripng_redistribute_unset (int type)
{
  if (! zclient->redist[type])
    return CMD_SUCCESS;

  zclient->redist[type] = 0;

  if (zclient->sock > 0)
    zebra_redistribute_send (ZEBRA_REDISTRIBUTE_DELETE, zclient, type);

  ripng_redistribute_withdraw (type);
  
  return CMD_SUCCESS;
}

int
ripng_redistribute_check (int type)
{
  return (zclient->redist[type]);
}

static void
ripng_redistribute_metric_set (int type, int metric)
{
  ripng->route_map[type].metric_config = 1;
  ripng->route_map[type].metric = metric;
}

static int
ripng_redistribute_metric_unset (int type)
{
  ripng->route_map[type].metric_config = 0;
  ripng->route_map[type].metric = 0;
  return 0;
}

static void
ripng_redistribute_routemap_set (int type, const char *name)
{
  if (ripng->route_map[type].name)
    free (ripng->route_map[type].name);

  ripng->route_map[type].name = strdup (name);
  ripng->route_map[type].map = route_map_lookup_by_name (name);
}

static void
ripng_redistribute_routemap_unset (int type)
{
  if (ripng->route_map[type].name)
    free (ripng->route_map[type].name);

  ripng->route_map[type].name = NULL;
  ripng->route_map[type].map = NULL;
}

/* Redistribution types */
static struct {
  int type;
  int str_min_len;
  const char *str;
} redist_type[] = {
  {ZEBRA_ROUTE_KERNEL,  1, "kernel"},
  {ZEBRA_ROUTE_CONNECT, 1, "connected"},
  {ZEBRA_ROUTE_STATIC,  1, "static"},
  {ZEBRA_ROUTE_OSPF6,   1, "ospf6"},
  {ZEBRA_ROUTE_BGP,     1, "bgp"},
  {0, 0, NULL}
};

void
ripng_redistribute_clean ()
{
  int i;

  for (i = 0; redist_type[i].str; i++)
    {
      if (zclient->redist[redist_type[i].type])
        {
          if (zclient->sock > 0)
            zebra_redistribute_send (ZEBRA_REDISTRIBUTE_DELETE,
                                     zclient, redist_type[i].type);

          zclient->redist[redist_type[i].type] = 0;

          /* Remove the routes from RIPng table. */
          ripng_redistribute_withdraw (redist_type[i].type);
        }
    }
}

DEFUN (router_zebra,
       router_zebra_cmd,
       "router zebra",
       "Enable a routing process\n"
       "Make connection to zebra daemon\n")
{
  vty->node = ZEBRA_NODE;
  zclient->enable = 1;
  zclient_start (zclient);
  return CMD_SUCCESS;
}

DEFUN (no_router_zebra,
       no_router_zebra_cmd,
       "no router zebra",
       NO_STR
       "Disable a routing process\n"
       "Stop connection to zebra daemon\n")
{
  zclient->enable = 0;
  zclient_stop (zclient);
  return CMD_SUCCESS;
}

DEFUN (ripng_redistribute_ripng,
       ripng_redistribute_ripng_cmd,
       "redistribute ripng",
       "Redistribute information from another routing protocol\n"
       "RIPng route\n")
{
  zclient->redist[ZEBRA_ROUTE_RIPNG] = 1;
  return CMD_SUCCESS;
}

DEFUN (no_ripng_redistribute_ripng,
       no_ripng_redistribute_ripng_cmd,
       "no redistribute ripng",
       NO_STR
       "Redistribute information from another routing protocol\n"
       "RIPng route\n")
{
  zclient->redist[ZEBRA_ROUTE_RIPNG] = 0;
  return CMD_SUCCESS;
}

DEFUN (ripng_redistribute_type,
       ripng_redistribute_type_cmd,
       "redistribute (kernel|connected|static|ospf6|bgp)",
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n")
{
  int i;

  for(i = 0; redist_type[i].str; i++) 
    {
      if (strncmp (redist_type[i].str, argv[0], 
		   redist_type[i].str_min_len) == 0) 
	{
	  zclient_redistribute (ZEBRA_REDISTRIBUTE_ADD, zclient, redist_type[i].type);
	  return CMD_SUCCESS;
	}
    }

  vty_out(vty, "Invalid type %s%s", argv[0],
	  VTY_NEWLINE);

  return CMD_WARNING;
}

DEFUN (no_ripng_redistribute_type,
       no_ripng_redistribute_type_cmd,
       "no redistribute (kernel|connected|static|ospf6|bgp)",
       NO_STR
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n")
{
  int i;

  for (i = 0; redist_type[i].str; i++) 
    {
      if (strncmp(redist_type[i].str, argv[0], 
		  redist_type[i].str_min_len) == 0) 
	{
	  ripng_redistribute_metric_unset (redist_type[i].type);
	  ripng_redistribute_routemap_unset (redist_type[i].type);
	  return ripng_redistribute_unset (redist_type[i].type);
        }
    }

  vty_out(vty, "Invalid type %s%s", argv[0],
	  VTY_NEWLINE);

  return CMD_WARNING;
}


DEFUN (ripng_redistribute_type_metric,
       ripng_redistribute_type_metric_cmd,
       "redistribute (kernel|connected|static|ospf6|bgp) metric <0-16>",
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n"
       "Metric\n"
       "Metric value\n")
{
  int i;
  int metric;

  metric = atoi (argv[1]);

  for (i = 0; redist_type[i].str; i++) {
    if (strncmp(redist_type[i].str, argv[0],
		redist_type[i].str_min_len) == 0) 
      {
	ripng_redistribute_metric_set (redist_type[i].type, metric);
	zclient_redistribute (ZEBRA_REDISTRIBUTE_ADD, zclient, redist_type[i].type);
	return CMD_SUCCESS;
      }
  }

  vty_out(vty, "Invalid type %s%s", argv[0],
	  VTY_NEWLINE);

  return CMD_WARNING;
}

ALIAS (no_ripng_redistribute_type,
       no_ripng_redistribute_type_metric_cmd,
       "no redistribute (kernel|connected|static|ospf6|bgp) metric <0-16>",
       NO_STR
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n"
       "Metric\n"
       "Metric value\n")

DEFUN (ripng_redistribute_type_routemap,
       ripng_redistribute_type_routemap_cmd,
       "redistribute (kernel|connected|static|ospf6|bgp) route-map WORD",
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n"
       "Route map reference\n"
       "Pointer to route-map entries\n")
{
  int i;

  for (i = 0; redist_type[i].str; i++) {
    if (strncmp(redist_type[i].str, argv[0],
		redist_type[i].str_min_len) == 0) 
      {
	ripng_redistribute_routemap_set (redist_type[i].type, argv[1]);
	zclient_redistribute (ZEBRA_REDISTRIBUTE_ADD, zclient, redist_type[i].type);
	return CMD_SUCCESS;
      }
  }

  vty_out(vty, "Invalid type %s%s", argv[0],
	  VTY_NEWLINE);

  return CMD_WARNING;
}

ALIAS (no_ripng_redistribute_type,
       no_ripng_redistribute_type_routemap_cmd,
       "no redistribute (kernel|connected|static|ospf6|bgp) route-map WORD",
       NO_STR
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n"
       "Route map reference\n"
       "Pointer to route-map entries\n")

DEFUN (ripng_redistribute_type_metric_routemap,
       ripng_redistribute_type_metric_routemap_cmd,
       "redistribute (kernel|connected|static|ospf6|bgp) metric <0-16> route-map WORD",
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n"
       "Metric\n"
       "Metric value\n"
       "Route map reference\n"
       "Pointer to route-map entries\n")
{
  int i;
  int metric;

  metric = atoi (argv[1]);

  for (i = 0; redist_type[i].str; i++) {
    if (strncmp(redist_type[i].str, argv[0],
		redist_type[i].str_min_len) == 0) 
      {
	ripng_redistribute_metric_set (redist_type[i].type, metric);
	ripng_redistribute_routemap_set (redist_type[i].type, argv[2]);
	zclient_redistribute (ZEBRA_REDISTRIBUTE_ADD, zclient, redist_type[i].type);
	return CMD_SUCCESS;
      }
  }

  vty_out(vty, "Invalid type %s%s", argv[0],
	  VTY_NEWLINE);

  return CMD_WARNING;
}

ALIAS (no_ripng_redistribute_type,
       no_ripng_redistribute_type_metric_routemap_cmd,
       "no redistribute (kernel|connected|static|ospf6|bgp) metric <0-16> route-map WORD",
       NO_STR
       "Redistribute information from another routing protocol\n"
       "Kernel routes\n"
       "Connected\n"
       "Static routes\n"
       "Open Shortest Path First (OSPFv3)\n"
       "Border Gateway Protocol (BGP)\n"
       "Route map reference\n"
       "Pointer to route-map entries\n")

void
ripng_redistribute_write (struct vty *vty, int config_mode)
{
  int i;

  for (i = 0; i < ZEBRA_ROUTE_MAX; i++)
    if (i != zclient->redist_default && zclient->redist[i])
      {
      if (config_mode)
	{
	  if (ripng->route_map[i].metric_config)
	    {
	      if (ripng->route_map[i].name)
		vty_out (vty, " redistribute %s metric %d route-map %s%s",
			 zebra_route_string(i), ripng->route_map[i].metric,
			ripng->route_map[i].name, VTY_NEWLINE);
	      else
		vty_out (vty, " redistribute %s metric %d%s",
			zebra_route_string(i), ripng->route_map[i].metric,
			VTY_NEWLINE);
	    }
	  else
	    {
	      if (ripng->route_map[i].name)
		vty_out (vty, " redistribute %s route-map %s%s",
			 zebra_route_string(i), ripng->route_map[i].name,
			 VTY_NEWLINE);
	      else
		vty_out (vty, " redistribute %s%s", zebra_route_string(i),
			 VTY_NEWLINE);
	    }
	}
      else
	vty_out (vty, "    %s", zebra_route_string(i));
      }
}

/* RIPng configuration write function. */
static int
zebra_config_write (struct vty *vty)
{
  if (! zclient->enable)
    {
      vty_out (vty, "no router zebra%s", VTY_NEWLINE);
      return 1;
    }
  else if (! zclient->redist[ZEBRA_ROUTE_RIPNG])
    {
      vty_out (vty, "router zebra%s", VTY_NEWLINE);
      vty_out (vty, " no redistribute ripng%s", VTY_NEWLINE);
      return 1;
    }
  return 0;
}

/* Zebra node structure. */
static struct cmd_node zebra_node =
{
  ZEBRA_NODE,
  "%s(config-router)# ",
};

/* Initialize zebra structure and it's commands. */
void
zebra_init ()
{
  /* Allocate zebra structure. */
  zclient = zclient_new ();
  zclient_init (zclient, ZEBRA_ROUTE_RIPNG);

  zclient->interface_up = ripng_interface_up;
  zclient->interface_down = ripng_interface_down;
  zclient->interface_add = ripng_interface_add;
  zclient->interface_delete = ripng_interface_delete;
  zclient->interface_address_add = ripng_interface_address_add;
  zclient->interface_address_delete = ripng_interface_address_delete;
  zclient->ipv6_route_add = ripng_zebra_read_ipv6;
  zclient->ipv6_route_delete = ripng_zebra_read_ipv6;
  
  /* Install zebra node. */
  install_node (&zebra_node, zebra_config_write);

  /* Install command element for zebra node. */ 
  install_element (CONFIG_NODE, &router_zebra_cmd);
  install_element (CONFIG_NODE, &no_router_zebra_cmd);
  install_default (ZEBRA_NODE);
  install_element (ZEBRA_NODE, &ripng_redistribute_ripng_cmd);
  install_element (ZEBRA_NODE, &no_ripng_redistribute_ripng_cmd);

  /* Install command elements to ripng node */
  install_element (RIPNG_NODE, &ripng_redistribute_type_cmd);
  install_element (RIPNG_NODE, &ripng_redistribute_type_routemap_cmd);
  install_element (RIPNG_NODE, &ripng_redistribute_type_metric_cmd);
  install_element (RIPNG_NODE, &ripng_redistribute_type_metric_routemap_cmd);
  install_element (RIPNG_NODE, &no_ripng_redistribute_type_cmd);
  install_element (RIPNG_NODE, &no_ripng_redistribute_type_routemap_cmd);
  install_element (RIPNG_NODE, &no_ripng_redistribute_type_metric_cmd);
  install_element (RIPNG_NODE, &no_ripng_redistribute_type_metric_routemap_cmd);
}