/* zebra routemap.
 * Copyright (C) 2006 IBM Corporation
 *
 * 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 "memory.h"
#include "prefix.h"
#include "rib.h"
#include "routemap.h"
#include "command.h"
#include "filter.h"
#include "plist.h"
#include "vrf.h"

#include "zebra/zserv.h"

/* Add zebra route map rule */
static int
zebra_route_match_add(struct vty *vty, struct route_map_index *index,
		      const char *command, const char *arg)
{
  int ret;

  ret = route_map_add_match (index, command, arg);
  if (ret)
    {
      switch (ret)
	{
	case RMAP_RULE_MISSING:
	  vty_out (vty, "%% Can't find rule.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	}
    }
  return CMD_SUCCESS;
}

/* Delete zebra route map rule. */
static int
zebra_route_match_delete (struct vty *vty, struct route_map_index *index,
			const char *command, const char *arg)
{
  int ret;

  ret = route_map_delete_match (index, command, arg);
  if (ret)
    {
      switch (ret)
	{
	case RMAP_RULE_MISSING:
	  vty_out (vty, "%% Can't find rule.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	}
    }
  return CMD_SUCCESS;
}

/* Add zebra route map rule. */
static int
zebra_route_set_add (struct vty *vty, struct route_map_index *index,
		   const char *command, const char *arg)
{
  int ret;

  ret = route_map_add_set (index, command, arg);
  if (ret)
    {
      switch (ret)
	{
	case RMAP_RULE_MISSING:
	  vty_out (vty, "%% Can't find rule.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	}
    }
  return CMD_SUCCESS;
}

/* Delete zebra route map rule. */
static int
zebra_route_set_delete (struct vty *vty, struct route_map_index *index,
		      const char *command, const char *arg)
{
  int ret;

  ret = route_map_delete_set (index, command, arg);
  if (ret)
    {
      switch (ret)
	{
	case RMAP_RULE_MISSING:
	  vty_out (vty, "%% Can't find rule.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	}
    }
  return CMD_SUCCESS;
}


/* `match interface IFNAME' */
/* Match function return 1 if match is success else return zero. */
static route_map_result_t
route_match_interface (void *rule, struct prefix *prefix,
		       route_map_object_t type, void *object)
{
  struct nexthop_vrfid *nh_vrf;
  struct nexthop *nexthop;
  char *ifname = rule;
  unsigned int ifindex;

  if (type == RMAP_ZEBRA)
    {
      if (strcasecmp(ifname, "any") == 0)
	return RMAP_MATCH;
      nh_vrf = object;
      if (!nh_vrf)
	return RMAP_NOMATCH;
      ifindex = ifname2ifindex_vrf (ifname, nh_vrf->vrf_id);
      if (ifindex == 0)
	return RMAP_NOMATCH;
      nexthop = nh_vrf->nexthop;
      if (!nexthop)
	return RMAP_NOMATCH;
      if (nexthop->ifindex == ifindex)
	return RMAP_MATCH;
    }
  return RMAP_NOMATCH;
}

/* Route map `match interface' match statement. `arg' is IFNAME value */
static void *
route_match_interface_compile (const char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

/* Free route map's compiled `match interface' value. */
static void
route_match_interface_free (void *rule)
{
  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
}

/* Route map commands for interface matching */
struct route_map_rule_cmd route_match_interface_cmd =
{
   "interface",
   route_match_interface,
   route_match_interface_compile,
   route_match_interface_free
};

DEFUN (match_interface,
       match_interface_cmd,
       "match interface WORD",
       MATCH_STR
       "match first hop interface of route\n"
       "Interface name\n")
{
  return zebra_route_match_add (vty, vty->index, "interface", argv[0]);
}

DEFUN (no_match_interface,
       no_match_interface_cmd,
       "no match interface",
       NO_STR
       MATCH_STR
       "Match first hop interface of route\n")
{
  if (argc == 0)
    return zebra_route_match_delete (vty, vty->index, "interface", NULL);

  return zebra_route_match_delete (vty, vty->index, "interface", argv[0]);
}

ALIAS (no_match_interface,
       no_match_interface_val_cmd,
       "no match interface WORD",
       NO_STR
       MATCH_STR
       "Match first hop interface of route\n"
       "Interface name\n")

DEFUN (match_ip_next_hop,
       match_ip_next_hop_cmd,
       "match ip next-hop (<1-199>|<1300-2699>|WORD)",
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")
{
  return zebra_route_match_add (vty, vty->index, "ip next-hop", argv[0]);
}

DEFUN (no_match_ip_next_hop,
       no_match_ip_next_hop_cmd,
       "no match ip next-hop",
       NO_STR
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n")
{
  if (argc == 0)
    return zebra_route_match_delete (vty, vty->index, "ip next-hop", NULL);

  return zebra_route_match_delete (vty, vty->index, "ip next-hop", argv[0]);
}

ALIAS (no_match_ip_next_hop,
       no_match_ip_next_hop_val_cmd,
       "no match ip next-hop (<1-199>|<1300-2699>|WORD)",
       NO_STR
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")

DEFUN (match_ip_next_hop_prefix_list,
       match_ip_next_hop_prefix_list_cmd,
       "match ip next-hop prefix-list WORD",
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
  return zebra_route_match_add (vty, vty->index, "ip next-hop prefix-list", argv[0]);
}

DEFUN (no_match_ip_next_hop_prefix_list,
       no_match_ip_next_hop_prefix_list_cmd,
       "no match ip next-hop prefix-list",
       NO_STR
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "Match entries of prefix-lists\n")
{
  if (argc == 0)
    return zebra_route_match_delete (vty, vty->index, "ip next-hop prefix-list", NULL);

  return zebra_route_match_delete (vty, vty->index, "ip next-hop prefix-list", argv[0]);
}

ALIAS (no_match_ip_next_hop_prefix_list,
       no_match_ip_next_hop_prefix_list_val_cmd,
       "no match ip next-hop prefix-list WORD",
       NO_STR
       MATCH_STR
       IP_STR
       "Match next-hop address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")

DEFUN (match_ip_address,
       match_ip_address_cmd,
       "match ip address (<1-199>|<1300-2699>|WORD)",
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")

{
  return zebra_route_match_add (vty, vty->index, "ip address", argv[0]);
}

DEFUN (no_match_ip_address, 
       no_match_ip_address_cmd,
       "no match ip address",
       NO_STR
       MATCH_STR
       IP_STR
       "Match address of route\n")
{
  if (argc == 0)
    return zebra_route_match_delete (vty, vty->index, "ip address", NULL);

  return zebra_route_match_delete (vty, vty->index, "ip address", argv[0]);
}

ALIAS (no_match_ip_address,
       no_match_ip_address_val_cmd,
       "no match ip address (<1-199>|<1300-2699>|WORD)",
       NO_STR
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "IP access-list number\n"
       "IP access-list number (expanded range)\n"
       "IP Access-list name\n")

DEFUN (match_ip_address_prefix_list, 
       match_ip_address_prefix_list_cmd,
       "match ip address prefix-list WORD",
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")
{
  return zebra_route_match_add (vty, vty->index, "ip address prefix-list", argv[0]);
}

DEFUN (no_match_ip_address_prefix_list,
       no_match_ip_address_prefix_list_cmd,
       "no match ip address prefix-list",
       NO_STR
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "Match entries of prefix-lists\n")
{
  if (argc == 0)
    return zebra_route_match_delete (vty, vty->index, "ip address prefix-list", NULL);

  return zebra_route_match_delete (vty, vty->index, "ip address prefix-list", argv[0]);
}

ALIAS (no_match_ip_address_prefix_list,
       no_match_ip_address_prefix_list_val_cmd,
       "no match ip address prefix-list WORD",
       NO_STR
       MATCH_STR
       IP_STR
       "Match address of route\n"
       "Match entries of prefix-lists\n"
       "IP prefix-list name\n")

/* set functions */

DEFUN (set_src,
       set_src_cmd,
       "set src A.B.C.D",
       SET_STR
       "src address for route\n"
       "src address\n")
{
  struct in_addr src;
  struct interface *pif = NULL;
  vrf_iter_t iter;

  if (inet_pton(AF_INET, argv[0], &src) <= 0)
    {
      vty_out (vty, "%% not a local address%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  for (iter = vrf_first (); iter != VRF_ITER_INVALID; iter = vrf_next (iter))
    if ((pif = if_lookup_exact_address_vrf (src, vrf_iter2id (iter))) != NULL)
      break;

  if (!pif)
    {
      vty_out (vty, "%% not a local address%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  return zebra_route_set_add (vty, vty->index, "src", argv[0]);
}

DEFUN (no_set_src,
       no_set_src_cmd,
       "no set src",
       NO_STR
       SET_STR
       "Source address for route\n")
{
  if (argc == 0)
    return zebra_route_set_delete (vty, vty->index, "src", NULL);

  return zebra_route_set_delete (vty, vty->index, "src", argv[0]);
}

ALIAS (no_set_src,
       no_set_src_val_cmd,
       "no set src (A.B.C.D)",
       NO_STR
       SET_STR
       "src address for route\n"
       "src address\n")

/*XXXXXXXXXXXXXXXXXXXXXXXXXXXX*/

/* `match ip next-hop IP_ACCESS_LIST' */

/* Match function return 1 if match is success else return zero. */
static route_map_result_t
route_match_ip_next_hop (void *rule, struct prefix *prefix,
			route_map_object_t type, void *object)
{
  struct access_list *alist;
  struct nexthop *nexthop;
  struct prefix_ipv4 p;

  if (type == RMAP_ZEBRA)
    {
      nexthop = object;
      switch (nexthop->type) {
      case NEXTHOP_TYPE_IFINDEX:
      case NEXTHOP_TYPE_IFNAME:
        /* Interface routes can't match ip next-hop */
        return RMAP_NOMATCH;
      case NEXTHOP_TYPE_IPV4_IFINDEX:
      case NEXTHOP_TYPE_IPV4_IFNAME:
      case NEXTHOP_TYPE_IPV4:
        p.family = AF_INET;
        p.prefix = nexthop->gate.ipv4;
        p.prefixlen = IPV4_MAX_BITLEN;
        break;
      default:
        return RMAP_NOMATCH;
      }
      alist = access_list_lookup (AFI_IP, (char *) rule);
      if (alist == NULL)
	return RMAP_NOMATCH;

      return (access_list_apply (alist, &p) == FILTER_DENY ?
	      RMAP_NOMATCH : RMAP_MATCH);
    }
  return RMAP_NOMATCH;
}

/* Route map `ip next-hop' match statement.  `arg' should be
   access-list name. */
static void *
route_match_ip_next_hop_compile (const char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

/* Free route map's compiled `. */
static void
route_match_ip_next_hop_free (void *rule)
{
  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
}

/* Route map commands for ip next-hop matching. */
static struct route_map_rule_cmd route_match_ip_next_hop_cmd =
{
  "ip next-hop",
  route_match_ip_next_hop,
  route_match_ip_next_hop_compile,
  route_match_ip_next_hop_free
};

/* `match ip next-hop prefix-list PREFIX_LIST' */

static route_map_result_t
route_match_ip_next_hop_prefix_list (void *rule, struct prefix *prefix,
                                    route_map_object_t type, void *object)
{
  struct prefix_list *plist;
  struct nexthop *nexthop;
  struct prefix_ipv4 p;

  if (type == RMAP_ZEBRA)
    {
      nexthop = object;
      switch (nexthop->type) {
      case NEXTHOP_TYPE_IFINDEX:
      case NEXTHOP_TYPE_IFNAME:
        /* Interface routes can't match ip next-hop */
        return RMAP_NOMATCH;
      case NEXTHOP_TYPE_IPV4_IFINDEX:
      case NEXTHOP_TYPE_IPV4_IFNAME:
      case NEXTHOP_TYPE_IPV4:
        p.family = AF_INET;
        p.prefix = nexthop->gate.ipv4;
        p.prefixlen = IPV4_MAX_BITLEN;
        break;
      default:
        return RMAP_NOMATCH;
      }
      plist = prefix_list_lookup (AFI_IP, (char *) rule);
      if (plist == NULL)
        return RMAP_NOMATCH;

      return (prefix_list_apply (plist, &p) == PREFIX_DENY ?
              RMAP_NOMATCH : RMAP_MATCH);
    }
  return RMAP_NOMATCH;
}

static void *
route_match_ip_next_hop_prefix_list_compile (const char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

static void
route_match_ip_next_hop_prefix_list_free (void *rule)
{
  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
}

static struct route_map_rule_cmd route_match_ip_next_hop_prefix_list_cmd =
{
  "ip next-hop prefix-list",
  route_match_ip_next_hop_prefix_list,
  route_match_ip_next_hop_prefix_list_compile,
  route_match_ip_next_hop_prefix_list_free
};

/* `match ip address IP_ACCESS_LIST' */

/* Match function should return 1 if match is success else return
   zero. */
static route_map_result_t
route_match_ip_address (void *rule, struct prefix *prefix, 
			route_map_object_t type, void *object)
{
  struct access_list *alist;

  if (type == RMAP_ZEBRA)
    {
      alist = access_list_lookup (AFI_IP, (char *) rule);
      if (alist == NULL)
	return RMAP_NOMATCH;
    
      return (access_list_apply (alist, prefix) == FILTER_DENY ?
	      RMAP_NOMATCH : RMAP_MATCH);
    }
  return RMAP_NOMATCH;
}

/* Route map `ip address' match statement.  `arg' should be
   access-list name. */
static void *
route_match_ip_address_compile (const char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

/* Free route map's compiled `ip address' value. */
static void
route_match_ip_address_free (void *rule)
{
  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
}

/* Route map commands for ip address matching. */
static struct route_map_rule_cmd route_match_ip_address_cmd =
{
  "ip address",
  route_match_ip_address,
  route_match_ip_address_compile,
  route_match_ip_address_free
};

/* `match ip address prefix-list PREFIX_LIST' */

static route_map_result_t
route_match_ip_address_prefix_list (void *rule, struct prefix *prefix, 
				    route_map_object_t type, void *object)
{
  struct prefix_list *plist;

  if (type == RMAP_ZEBRA)
    {
      plist = prefix_list_lookup (AFI_IP, (char *) rule);
      if (plist == NULL)
	return RMAP_NOMATCH;
    
      return (prefix_list_apply (plist, prefix) == PREFIX_DENY ?
	      RMAP_NOMATCH : RMAP_MATCH);
    }
  return RMAP_NOMATCH;
}

static void *
route_match_ip_address_prefix_list_compile (const char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

static void
route_match_ip_address_prefix_list_free (void *rule)
{
  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
}

static struct route_map_rule_cmd route_match_ip_address_prefix_list_cmd =
{
  "ip address prefix-list",
  route_match_ip_address_prefix_list,
  route_match_ip_address_prefix_list_compile,
  route_match_ip_address_prefix_list_free
};


/* `set src A.B.C.D' */

/* Set src. */
static route_map_result_t
route_set_src (void *rule, struct prefix *prefix, 
		  route_map_object_t type, void *object)
{
  if (type == RMAP_ZEBRA)
    {
      struct nexthop *nexthop;

      nexthop = object;
      nexthop->src = *(union g_addr *)rule;
    }
  return RMAP_OKAY;
}

/* set src compilation. */
static void *
route_set_src_compile (const char *arg)
{
  union g_addr src, *psrc;

  if (inet_pton(AF_INET, arg, &src.ipv4) != 1
#ifdef HAVE_IPV6
      && inet_pton(AF_INET6, arg, &src.ipv6) != 1
#endif /* HAVE_IPV6 */
     )
    return NULL;

  psrc = XMALLOC (MTYPE_ROUTE_MAP_COMPILED, sizeof (union g_addr));
  *psrc = src;

  return psrc;
}

/* Free route map's compiled `set src' value. */
static void
route_set_src_free (void *rule)
{
  XFREE (MTYPE_ROUTE_MAP_COMPILED, rule);
}

/* Set src rule structure. */
static struct route_map_rule_cmd route_set_src_cmd = 
{
  "src",
  route_set_src,
  route_set_src_compile,
  route_set_src_free,
};

void
zebra_route_map_init ()
{
  route_map_init ();
  route_map_init_vty ();

  route_map_install_match (&route_match_interface_cmd);
  route_map_install_match (&route_match_ip_next_hop_cmd);
  route_map_install_match (&route_match_ip_next_hop_prefix_list_cmd);
  route_map_install_match (&route_match_ip_address_cmd);
  route_map_install_match (&route_match_ip_address_prefix_list_cmd);
/* */
  route_map_install_set (&route_set_src_cmd);
/* */
  install_element (RMAP_NODE, &match_interface_cmd);
  install_element (RMAP_NODE, &no_match_interface_cmd); 
  install_element (RMAP_NODE, &no_match_interface_val_cmd); 
  install_element (RMAP_NODE, &match_ip_next_hop_cmd); 
  install_element (RMAP_NODE, &no_match_ip_next_hop_cmd); 
  install_element (RMAP_NODE, &no_match_ip_next_hop_val_cmd); 
  install_element (RMAP_NODE, &match_ip_next_hop_prefix_list_cmd); 
  install_element (RMAP_NODE, &no_match_ip_next_hop_prefix_list_cmd); 
  install_element (RMAP_NODE, &no_match_ip_next_hop_prefix_list_val_cmd); 
  install_element (RMAP_NODE, &match_ip_address_cmd); 
  install_element (RMAP_NODE, &no_match_ip_address_cmd); 
  install_element (RMAP_NODE, &no_match_ip_address_val_cmd); 
  install_element (RMAP_NODE, &match_ip_address_prefix_list_cmd); 
  install_element (RMAP_NODE, &no_match_ip_address_prefix_list_cmd); 
  install_element (RMAP_NODE, &no_match_ip_address_prefix_list_val_cmd);
/* */
  install_element (RMAP_NODE, &set_src_cmd);
  install_element (RMAP_NODE, &no_set_src_cmd);
}