Initial revision

[mirror_frr.git] / lib / routemap.c

/* Route map function.
   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 "linklist.h"
#include "memory.h"
#include "vector.h"
#include "prefix.h"
#include "routemap.h"
#include "command.h"
\f
/* Vector for route match rules. */
static vector route_match_vec;

/* Vector for route set rules. */
static vector route_set_vec;

/* Route map rule. This rule has both `match' rule and `set' rule. */
struct route_map_rule
{
  /* Rule type. */
  struct route_map_rule_cmd *cmd;

  /* For pretty printing. */
  char *rule_str;

  /* Pre-compiled match rule. */
  void *value;

  /* Linked list. */
  struct route_map_rule *next;
  struct route_map_rule *prev;
};

/* Making route map list. */
struct route_map_list
{
  struct route_map *head;
  struct route_map *tail;

  void (*add_hook) (char *);
  void (*delete_hook) (char *);
  void (*event_hook) (route_map_event_t, char *); 
};

/* Master list of route map. */
static struct route_map_list route_map_master = { NULL, NULL, NULL, NULL };

static void
route_map_rule_delete (struct route_map_rule_list *,
		       struct route_map_rule *);

static void
route_map_index_delete (struct route_map_index *, int);
\f
/* New route map allocation. Please note route map's name must be
   specified. */
static struct route_map *
route_map_new (char *name)
{
  struct route_map *new;

  new =  XCALLOC (MTYPE_ROUTE_MAP, sizeof (struct route_map));
  new->name = XSTRDUP (MTYPE_ROUTE_MAP_NAME, name);
  return new;
}

/* Add new name to route_map. */
static struct route_map *
route_map_add (char *name)
{
  struct route_map *map;
  struct route_map_list *list;

  map = route_map_new (name);
  list = &route_map_master;
    
  map->next = NULL;
  map->prev = list->tail;
  if (list->tail)
    list->tail->next = map;
  else
    list->head = map;
  list->tail = map;

  /* Execute hook. */
  if (route_map_master.add_hook)
    (*route_map_master.add_hook) (name);

  return map;
}

/* Route map delete from list. */
static void
route_map_delete (struct route_map *map)
{
  struct route_map_list *list;
  struct route_map_index *index;
  char *name;
  
  while ((index = map->head) != NULL)
    route_map_index_delete (index, 0);

  name = map->name;

  list = &route_map_master;

  if (map->next)
    map->next->prev = map->prev;
  else
    list->tail = map->prev;

  if (map->prev)
    map->prev->next = map->next;
  else
    list->head = map->next;

  XFREE (MTYPE_ROUTE_MAP, map);

  /* Execute deletion hook. */
  if (route_map_master.delete_hook)
    (*route_map_master.delete_hook) (name);

  if (name)
    XFREE (MTYPE_ROUTE_MAP_NAME, name);

}

/* Lookup route map by route map name string. */
struct route_map *
route_map_lookup_by_name (char *name)
{
  struct route_map *map;

  for (map = route_map_master.head; map; map = map->next)
    if (strcmp (map->name, name) == 0)
      return map;
  return NULL;
}

/* Lookup route map.  If there isn't route map create one and return
   it. */
struct route_map *
route_map_get (char *name)
{
  struct route_map *map;

  map = route_map_lookup_by_name (name);
  if (map == NULL)
    map = route_map_add (name);
  return map;
}

/* Return route map's type string. */
static char *
route_map_type_str (enum route_map_type type)
{
  switch (type)
    {
    case RMAP_PERMIT:
      return "permit";
      break;
    case RMAP_DENY:
      return "deny";
      break;
    default:
      return "";
      break;
    }
}

int
route_map_empty (struct route_map *map)
{
  if (map->head == NULL && map->tail == NULL)
    return 1;
  else
    return 0;
}

/* For debug. */
void
route_map_print ()
{
  struct route_map *map;
  struct route_map_index *index;
  struct route_map_rule *rule;

  for (map = route_map_master.head; map; map = map->next)
    for (index = map->head; index; index = index->next)
      {
	printf ("route-map %s %s %d\n", 
		map->name,
		route_map_type_str (index->type),
		index->pref);
	for (rule = index->match_list.head; rule; rule = rule->next)
	  printf (" match %s %s\n", rule->cmd->str, rule->rule_str);
	for (rule = index->set_list.head; rule; rule = rule->next)
	  printf (" set %s %s\n", rule->cmd->str, rule->rule_str);
	if (index->exitpolicy == RMAP_GOTO)
	  printf (" on-match goto %d\n", index->nextpref);
	if (index->exitpolicy == RMAP_NEXT)
	  printf (" on-match next\n");
      }
}

/* New route map allocation. Please note route map's name must be
   specified. */
struct route_map_index *
route_map_index_new ()
{
  struct route_map_index *new;

  new =  XCALLOC (MTYPE_ROUTE_MAP_INDEX, sizeof (struct route_map_index));
  new->exitpolicy = RMAP_EXIT; /* Default to Cisco-style */
  return new;
}

/* Free route map index. */
static void
route_map_index_delete (struct route_map_index *index, int notify)
{
  struct route_map_rule *rule;

  /* Free route match. */
  while ((rule = index->match_list.head) != NULL)
    route_map_rule_delete (&index->match_list, rule);

  /* Free route set. */
  while ((rule = index->set_list.head) != NULL)
    route_map_rule_delete (&index->set_list, rule);

  /* Remove index from route map list. */
  if (index->next)
    index->next->prev = index->prev;
  else
    index->map->tail = index->prev;

  if (index->prev)
    index->prev->next = index->next;
  else
    index->map->head = index->next;

    /* Execute event hook. */
  if (route_map_master.event_hook && notify)
    (*route_map_master.event_hook) (RMAP_EVENT_INDEX_DELETED,
				    index->map->name);

  XFREE (MTYPE_ROUTE_MAP_INDEX, index);
}

/* Lookup index from route map. */
struct route_map_index *
route_map_index_lookup (struct route_map *map, enum route_map_type type,
			int pref)
{
  struct route_map_index *index;

  for (index = map->head; index; index = index->next)
    if ((index->type == type || type == RMAP_ANY)
	&& index->pref == pref)
      return index;
  return NULL;
}

/* Add new index to route map. */
struct route_map_index *
route_map_index_add (struct route_map *map, enum route_map_type type,
		     int pref)
{
  struct route_map_index *index;
  struct route_map_index *point;

  /* Allocate new route map inex. */
  index = route_map_index_new ();
  index->map = map;
  index->type = type;
  index->pref = pref;
  
  /* Compare preference. */
  for (point = map->head; point; point = point->next)
    if (point->pref >= pref)
      break;

  if (map->head == NULL)
    {
      map->head = map->tail = index;
    }
  else if (point == NULL)
    {
      index->prev = map->tail;
      map->tail->next = index;
      map->tail = index;
    }
  else if (point == map->head)
    {
      index->next = map->head;
      map->head->prev = index;
      map->head = index;
    }
  else
    {
      index->next = point;
      index->prev = point->prev;
      if (point->prev)
	point->prev->next = index;
      point->prev = index;
    }

  /* Execute event hook. */
  if (route_map_master.event_hook)
    (*route_map_master.event_hook) (RMAP_EVENT_INDEX_ADDED,
				    map->name);

  return index;
}

/* Get route map index. */
struct route_map_index *
route_map_index_get (struct route_map *map, enum route_map_type type, 
		     int pref)
{
  struct route_map_index *index;

  index = route_map_index_lookup (map, RMAP_ANY, pref);
  if (index && index->type != type)
    {
      /* Delete index from route map. */
      route_map_index_delete (index, 1);
      index = NULL;
    }
  if (index == NULL)
    index = route_map_index_add (map, type, pref);
  return index;
}

/* New route map rule */
struct route_map_rule *
route_map_rule_new ()
{
  struct route_map_rule *new;

  new = XCALLOC (MTYPE_ROUTE_MAP_RULE, sizeof (struct route_map_rule));
  return new;
}
\f
/* Install rule command to the match list. */
void
route_map_install_match (struct route_map_rule_cmd *cmd)
{
  vector_set (route_match_vec, cmd);
}

/* Install rule command to the set list. */
void
route_map_install_set (struct route_map_rule_cmd *cmd)
{
  vector_set (route_set_vec, cmd);
}

/* Lookup rule command from match list. */
struct route_map_rule_cmd *
route_map_lookup_match (char *name)
{
  int i;
  struct route_map_rule_cmd *rule;

  for (i = 0; i < vector_max (route_match_vec); i++)
    if ((rule = vector_slot (route_match_vec, i)) != NULL)
      if (strcmp (rule->str, name) == 0)
	return rule;
  return NULL;
}

/* Lookup rule command from set list. */
struct route_map_rule_cmd *
route_map_lookup_set (char *name)
{
  int i;
  struct route_map_rule_cmd *rule;

  for (i = 0; i < vector_max (route_set_vec); i++)
    if ((rule = vector_slot (route_set_vec, i)) != NULL)
      if (strcmp (rule->str, name) == 0)
	return rule;
  return NULL;
}

/* Add match and set rule to rule list. */
static void
route_map_rule_add (struct route_map_rule_list *list,
		    struct route_map_rule *rule)
{
  rule->next = NULL;
  rule->prev = list->tail;
  if (list->tail)
    list->tail->next = rule;
  else
    list->head = rule;
  list->tail = rule;
}

/* Delete rule from rule list. */
static void
route_map_rule_delete (struct route_map_rule_list *list,
		       struct route_map_rule *rule)
{
  if (rule->cmd->func_free)
    (*rule->cmd->func_free) (rule->value);

  if (rule->rule_str)
    XFREE (MTYPE_ROUTE_MAP_RULE_STR, rule->rule_str);

  if (rule->next)
    rule->next->prev = rule->prev;
  else
    list->tail = rule->prev;
  if (rule->prev)
    rule->prev->next = rule->next;
  else
    list->head = rule->next;

  XFREE (MTYPE_ROUTE_MAP_RULE, rule);
}

/* strcmp wrapper function which don't crush even argument is NULL. */
int
rulecmp (char *dst, char *src)
{
  if (dst == NULL)
    {
      if (src ==  NULL)
	return 0;
      else
	return 1;
    }
  else
    {
      if (src == NULL)
	return 1;
      else
	return strcmp (dst, src);
    }
  return 1;
}

/* Add match statement to route map. */
int
route_map_add_match (struct route_map_index *index, char *match_name,
		     char *match_arg)
{
  struct route_map_rule *rule;
  struct route_map_rule *next;
  struct route_map_rule_cmd *cmd;
  void *compile;
  int replaced = 0;

  /* First lookup rule for add match statement. */
  cmd = route_map_lookup_match (match_name);
  if (cmd == NULL)
    return RMAP_RULE_MISSING;

  /* Next call compile function for this match statement. */
  if (cmd->func_compile)
    {
      compile= (*cmd->func_compile)(match_arg);
      if (compile == NULL)
	return RMAP_COMPILE_ERROR;
    }
  else
    compile = NULL;

  /* If argument is completely same ignore it. */
  for (rule = index->match_list.head; rule; rule = next)
    {
      next = rule->next;
      if (rule->cmd == cmd)
	{	
	  route_map_rule_delete (&index->match_list, rule);
	  replaced = 1;
	}
    }

  /* Add new route map match rule. */
  rule = route_map_rule_new ();
  rule->cmd = cmd;
  rule->value = compile;
  if (match_arg)
    rule->rule_str = XSTRDUP (MTYPE_ROUTE_MAP_RULE_STR, match_arg);
  else
    rule->rule_str = NULL;

  /* Add new route match rule to linked list. */
  route_map_rule_add (&index->match_list, rule);

  /* Execute event hook. */
  if (route_map_master.event_hook)
    (*route_map_master.event_hook) (replaced ?
				    RMAP_EVENT_MATCH_REPLACED:
				    RMAP_EVENT_MATCH_ADDED,
				    index->map->name);

  return 0;
}

/* Delete specified route match rule. */
int
route_map_delete_match (struct route_map_index *index, char *match_name,
			char *match_arg)
{
  struct route_map_rule *rule;
  struct route_map_rule_cmd *cmd;

  cmd = route_map_lookup_match (match_name);
  if (cmd == NULL)
    return 1;
  
  for (rule = index->match_list.head; rule; rule = rule->next)
    if (rule->cmd == cmd && 
	(rulecmp (rule->rule_str, match_arg) == 0 || match_arg == NULL))
      {
	route_map_rule_delete (&index->match_list, rule);
	/* Execute event hook. */
	if (route_map_master.event_hook)
	  (*route_map_master.event_hook) (RMAP_EVENT_MATCH_DELETED,
					  index->map->name);
	return 0;
      }
  /* Can't find matched rule. */
  return 1;
}

/* Add route-map set statement to the route map. */
int
route_map_add_set (struct route_map_index *index, char *set_name,
		   char *set_arg)
{
  struct route_map_rule *rule;
  struct route_map_rule *next;
  struct route_map_rule_cmd *cmd;
  void *compile;
  int replaced = 0;

  cmd = route_map_lookup_set (set_name);
  if (cmd == NULL)
    return RMAP_RULE_MISSING;

  /* Next call compile function for this match statement. */
  if (cmd->func_compile)
    {
      compile= (*cmd->func_compile)(set_arg);
      if (compile == NULL)
	return RMAP_COMPILE_ERROR;
    }
  else
    compile = NULL;

 /* Add by WJL. if old set command of same kind exist, delete it first
    to ensure only one set command of same kind exist under a
    route_map_index. */
  for (rule = index->set_list.head; rule; rule = next)
    {
      next = rule->next;
      if (rule->cmd == cmd)
	{
	  route_map_rule_delete (&index->set_list, rule);
	  replaced = 1;
	}
    }

  /* Add new route map match rule. */
  rule = route_map_rule_new ();
  rule->cmd = cmd;
  rule->value = compile;
  if (set_arg)
    rule->rule_str = XSTRDUP (MTYPE_ROUTE_MAP_RULE_STR, set_arg);
  else
    rule->rule_str = NULL;

  /* Add new route match rule to linked list. */
  route_map_rule_add (&index->set_list, rule);

  /* Execute event hook. */
  if (route_map_master.event_hook)
    (*route_map_master.event_hook) (replaced ?
				    RMAP_EVENT_SET_REPLACED:
				    RMAP_EVENT_SET_ADDED,
				    index->map->name);
  return 0;
}

/* Delete route map set rule. */
int
route_map_delete_set (struct route_map_index *index, char *set_name,
			char *set_arg)
{
  struct route_map_rule *rule;
  struct route_map_rule_cmd *cmd;

  cmd = route_map_lookup_set (set_name);
  if (cmd == NULL)
    return 1;
  
  for (rule = index->set_list.head; rule; rule = rule->next)
    if ((rule->cmd == cmd) &&
         (rulecmp (rule->rule_str, set_arg) == 0 || set_arg == NULL))
      {
        route_map_rule_delete (&index->set_list, rule);
	/* Execute event hook. */
	if (route_map_master.event_hook)
	  (*route_map_master.event_hook) (RMAP_EVENT_SET_DELETED,
					  index->map->name);
        return 0;
      }
  /* Can't find matched rule. */
  return 1;
}

/* Apply route map's each index to the object. */
/*
** The matrix for a route-map looks like this:
** (note, this includes the description for the "NEXT"
** and "GOTO" frobs now
**
**            Match   |   No Match
**                    |
**  permit      a     |      c
**                    |
**  ------------------+---------------
**                    |
**  deny        b     |      d
**                    |
**
** a)   Apply Set statements, accept route
**      If NEXT is specified, goto NEXT statement
**      If GOTO is specified, goto the first clause where pref > nextpref
**      If nothing is specified, do as Cisco and finish
** b)   Finish route-map processing, and deny route
** c) & d)   Goto Next index
**
** If we get no matches after we've processed all updates, then the route
** is dropped too.
**
** Some notes on the new "NEXT" and "GOTO"
**   on-match next    - If this clause is matched, then the set statements
**                      are executed and then we drop through to the next clause
**   on-match goto n  - If this clause is matched, then the set statments
**                      are executed and then we goto the nth clause, or the
**                      first clause greater than this. In order to ensure
**                      route-maps *always* exit, you cannot jump backwards.
**                      Sorry ;)
**
** We need to make sure our route-map processing matches the above
*/
route_map_result_t
route_map_apply_index (struct route_map_index *index, struct prefix *prefix,
                       route_map_object_t type, void *object)
{
  int ret;
  struct route_map_rule *match;
  struct route_map_rule *set;
  
  /* Check all match rule and if there is no match rule return 0. */
  for (match = index->match_list.head; match; match = match->next)
    {
      /* Try each match statement in turn. If any return something
       other than RM_MATCH then we don't need to check anymore and can
       return */
      ret = (*match->cmd->func_apply)(match->value, prefix, type, object);
      if (ret != RMAP_MATCH)
	return ret;
    }

  /* We get here if all match statements matched From the matrix
   above, if this is PERMIT we go on and apply the SET functions.  If
   we're deny, we return indicating we matched a deny */

  /* Apply set statement to the object. */
  if (index->type == RMAP_PERMIT)
    {
      for (set = index->set_list.head; set; set = set->next)
	{
	  ret = (*set->cmd->func_apply)(set->value, prefix, type, object);
	}
      return RMAP_MATCH;
    }
  else 
    {
      return RMAP_DENYMATCH;
    }
  /* Should not get here! */
  return RMAP_MATCH;
}

/* Apply route map to the object. */
route_map_result_t
route_map_apply (struct route_map *map, struct prefix *prefix, 
		 route_map_object_t type, void *object)
{
  int ret = 0;
  struct route_map_index *index;

  if (map == NULL)
    return RMAP_DENYMATCH;

  for (index = map->head; index; index = index->next)
    {
      /* Apply this index. End here if we get a RM_NOMATCH */
      ret = route_map_apply_index (index, prefix, type, object);

      if (ret != RMAP_NOMATCH)
	{
	  /* We now have to handle the NEXT and GOTO clauses */
	  if(index->exitpolicy == RMAP_EXIT)
	    return ret;
	  if(index->exitpolicy == RMAP_GOTO)
	    {
	      /* Find the next clause to jump to */
	      struct route_map_index *next;

	      next = index->next;
	      while (next && next->pref < index->nextpref)
		{
		  index = next;
		  next = next->next;
		}
	      if (next == NULL)
		{
		  /* No clauses match! */
		  return ret;
		}
	    }
	  /* Otherwise, we fall through as it was a NEXT */
	}
    }
  /* Finally route-map does not match at all. */
  return RMAP_DENYMATCH;
}

void
route_map_add_hook (void (*func) (char *))
{
  route_map_master.add_hook = func;
}

void
route_map_delete_hook (void (*func) (char *))
{
  route_map_master.delete_hook = func;
}

void
route_map_event_hook (void (*func) (route_map_event_t, char *))
{
  route_map_master.event_hook = func;
}

void
route_map_init ()
{
  /* Make vector for match and set. */
  route_match_vec = vector_init (1);
  route_set_vec = vector_init (1);
}
\f
/* VTY related functions. */
DEFUN (route_map,
       route_map_cmd,
       "route-map WORD (deny|permit) <1-65535>",
       "Create route-map or enter route-map command mode\n"
       "Route map tag\n"
       "Route map denies set operations\n"
       "Route map permits set operations\n"
       "Sequence to insert to/delete from existing route-map entry\n")
{
  int permit;
  unsigned long pref;
  struct route_map *map;
  struct route_map_index *index;
  char *endptr = NULL;

  /* Permit check. */
  if (strncmp (argv[1], "permit", strlen (argv[1])) == 0)
    permit = RMAP_PERMIT;
  else if (strncmp (argv[1], "deny", strlen (argv[1])) == 0)
    permit = RMAP_DENY;
  else
    {
      vty_out (vty, "the third field must be [permit|deny]%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Preference check. */
  pref = strtoul (argv[2], &endptr, 10);
  if (pref == ULONG_MAX || *endptr != '\0')
    {
      vty_out (vty, "the fourth field must be positive integer%s",
	       VTY_NEWLINE);
      return CMD_WARNING;
    }
  if (pref == 0 || pref > 65535)
    {
      vty_out (vty, "the fourth field must be <1-65535>%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Get route map. */
  map = route_map_get (argv[0]);
  index = route_map_index_get (map, permit, pref);

  vty->index = index;
  vty->node = RMAP_NODE;
  return CMD_SUCCESS;
}

DEFUN (no_route_map_all,
       no_route_map_all_cmd,
       "no route-map WORD",
       NO_STR
       "Create route-map or enter route-map command mode\n"
       "Route map tag\n")
{
  struct route_map *map;

  map = route_map_lookup_by_name (argv[0]);
  if (map == NULL)
    {
      vty_out (vty, "%% Could not find route-map %s%s",
	       argv[0], VTY_NEWLINE);
      return CMD_WARNING;
    }

  route_map_delete (map);

  return CMD_SUCCESS;
}

DEFUN (no_route_map,
       no_route_map_cmd,
       "no route-map WORD (deny|permit) <1-65535>",
       NO_STR
       "Create route-map or enter route-map command mode\n"
       "Route map tag\n"
       "Route map denies set operations\n"
       "Route map permits set operations\n"
       "Sequence to insert to/delete from existing route-map entry\n")
{
  int permit;
  unsigned long pref;
  struct route_map *map;
  struct route_map_index *index;
  char *endptr = NULL;

  /* Permit check. */
  if (strncmp (argv[1], "permit", strlen (argv[1])) == 0)
    permit = RMAP_PERMIT;
  else if (strncmp (argv[1], "deny", strlen (argv[1])) == 0)
    permit = RMAP_DENY;
  else
    {
      vty_out (vty, "the third field must be [permit|deny]%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Preference. */
  pref = strtoul (argv[2], &endptr, 10);
  if (pref == ULONG_MAX || *endptr != '\0')
    {
      vty_out (vty, "the fourth field must be positive integer%s",
	       VTY_NEWLINE);
      return CMD_WARNING;
    }
  if (pref == 0 || pref > 65535)
    {
      vty_out (vty, "the fourth field must be <1-65535>%s", VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Existence check. */
  map = route_map_lookup_by_name (argv[0]);
  if (map == NULL)
    {
      vty_out (vty, "%% Could not find route-map %s%s",
	       argv[0], VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Lookup route map index. */
  index = route_map_index_lookup (map, permit, pref);
  if (index == NULL)
    {
      vty_out (vty, "%% Could not find route-map entry %s %s%s", 
	       argv[0], argv[2], VTY_NEWLINE);
      return CMD_WARNING;
    }

  /* Delete index from route map. */
  route_map_index_delete (index, 1);

  /* If this route rule is the last one, delete route map itself. */
  if (route_map_empty (map))
    route_map_delete (map);

  return CMD_SUCCESS;
}

DEFUN (rmap_onmatch_next,
       rmap_onmatch_next_cmd,
       "on-match next",
       "Exit policy on matches\n"
       "Next clause\n")
{
  struct route_map_index *index;

  index = vty->index;

  if (index)
    index->exitpolicy = RMAP_NEXT;

  return CMD_SUCCESS;
}

DEFUN (no_rmap_onmatch_next,
       no_rmap_onmatch_next_cmd,
       "no on-match next",
       NO_STR
       "Exit policy on matches\n"
       "Next clause\n")
{
  struct route_map_index *index;

  index = vty->index;
  
  if (index)
    index->exitpolicy = RMAP_EXIT;

  return CMD_SUCCESS;
}

DEFUN (rmap_onmatch_goto,
       rmap_onmatch_goto_cmd,
       "on-match goto <1-65535>",
       "Exit policy on matches\n"
       "Goto Clause number\n"
       "Number\n")
{
  struct route_map_index *index;
  int d = 0;

  if (argv[0])
    d = atoi(argv[0]);

  index = vty->index;
  if (index)
    {
      if (d <= index->pref)
	{
	  /* Can't allow you to do that, Dave */
	  vty_out (vty, "can't jump backwards in route-maps%s", 
		   VTY_NEWLINE);
	  return CMD_WARNING;
	}
      else
	{
	  index->exitpolicy = RMAP_GOTO;
	  index->nextpref = d;
	}
    }
  return CMD_SUCCESS;
}

DEFUN (no_rmap_onmatch_goto,
       no_rmap_onmatch_goto_cmd,
       "no on-match goto",
       NO_STR
       "Exit policy on matches\n"
       "Next clause\n")
{
  struct route_map_index *index;

  index = vty->index;

  if (index)
    index->exitpolicy = RMAP_EXIT;
  
  return CMD_SUCCESS;
}

/* Configuration write function. */
int
route_map_config_write (struct vty *vty)
{
  struct route_map *map;
  struct route_map_index *index;
  struct route_map_rule *rule;
  int first = 1;
  int write = 0;

  for (map = route_map_master.head; map; map = map->next)
    for (index = map->head; index; index = index->next)
      {
	if (!first)
	  vty_out (vty, "!%s", VTY_NEWLINE);
	else
	  first = 0;

	vty_out (vty, "route-map %s %s %d%s", 
		 map->name,
		 route_map_type_str (index->type),
		 index->pref, VTY_NEWLINE);

	for (rule = index->match_list.head; rule; rule = rule->next)
	  vty_out (vty, " match %s %s%s", rule->cmd->str, 
		   rule->rule_str ? rule->rule_str : "",
		   VTY_NEWLINE);

	for (rule = index->set_list.head; rule; rule = rule->next)
	  vty_out (vty, " set %s %s%s", rule->cmd->str,
		   rule->rule_str ? rule->rule_str : "",
		   VTY_NEWLINE);
	if (index->exitpolicy == RMAP_GOTO)
	  vty_out (vty, " on-match goto %d%s", index->nextpref,
		   VTY_NEWLINE);
	if (index->exitpolicy == RMAP_NEXT)
	  vty_out (vty," on-match next%s", VTY_NEWLINE);
	
	write++;
      }
  return write;
}

/* Route map node structure. */
struct cmd_node rmap_node =
{
  RMAP_NODE,
  "%s(config-route-map)# ",
  1
};

/* Initialization of route map vector. */
void
route_map_init_vty ()
{
  /* Install route map top node. */
  install_node (&rmap_node, route_map_config_write);

  /* Install route map commands. */
  install_default (RMAP_NODE);
  install_element (CONFIG_NODE, &route_map_cmd);
  install_element (CONFIG_NODE, &no_route_map_cmd);
  install_element (CONFIG_NODE, &no_route_map_all_cmd);

  /* Install the on-match stuff */
  install_element (RMAP_NODE, &route_map_cmd);
  install_element (RMAP_NODE, &rmap_onmatch_next_cmd);
  install_element (RMAP_NODE, &no_rmap_onmatch_next_cmd);
  install_element (RMAP_NODE, &rmap_onmatch_goto_cmd);
  install_element (RMAP_NODE, &no_rmap_onmatch_goto_cmd);
}