rip_routemap.c

大名鼎鼎的路由器源码。程序分ZEBRA、OSPFRIP等3个包。程序框架采用一个路由协议一个进程的方式

/* RIPv2 routemap.
 * Copyright (C) 1999 Kunihiro Ishiguro <[e-mail]>
 *
 * 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 "routemap.h"
#include "command.h"
#include "filter.h"
#include "log.h"
#include "sockunion.h"		/* for inet_aton () */
#include "plist.h"

#include "ripd/ripd.h"

/* Add rip route map rule. */
int
rip_route_match_add (struct vty *vty, struct route_map_index *index,
		     char *command, 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;
	  break;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	  break;
	}
    }
  return CMD_SUCCESS;
}

/* Delete rip route map rule. */
int
rip_route_match_delete (struct vty *vty, struct route_map_index *index,
			char *command, 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;
	  break;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	  break;
	}
    }
  return CMD_SUCCESS;
}

/* Add rip route map rule. */
int
rip_route_set_add (struct vty *vty, struct route_map_index *index,
		   char *command, 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;
	  break;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	  break;
	}
    }
  return CMD_SUCCESS;
}

/* Delete rip route map rule. */
int
rip_route_set_delete (struct vty *vty, struct route_map_index *index,
		      char *command, 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;
	  break;
	case RMAP_COMPILE_ERROR:
	  vty_out (vty, "%% Argument is malformed.%s", VTY_NEWLINE);
	  return CMD_WARNING;
	  break;
	}
    }
  return CMD_SUCCESS;
}

/* Hook function for updating route_map assignment. */
void
rip_route_map_update ()
{
  int i;

  if (rip) 
    {
      for (i = 0; i < ZEBRA_ROUTE_MAX; i++) 
	{
	  if (rip->route_map[i].name)
	    rip->route_map[i].map = 
	      route_map_lookup_by_name (rip->route_map[i].name);
	}
    }
}

/* `match metric METRIC' */
/* Match function return 1 if match is success else return zero. */
route_map_result_t
route_match_metric (void *rule, struct prefix *prefix, 
		    route_map_object_t type, void *object)
{
  u_int32_t *metric;
  struct rip_info *rinfo;

  if (type == RMAP_RIP)
    {
      metric = rule;
      rinfo = object;
    
      if (rinfo->metric == *metric)
	return RMAP_MATCH;
      else
	return RMAP_NOMATCH;
    }
  return RMAP_NOMATCH;
}

/* Route map `match metric' match statement. `arg' is METRIC value */
void *
route_match_metric_compile (char *arg)
{
  u_int32_t *metric;

  metric = XMALLOC (MTYPE_ROUTE_MAP_COMPILED, sizeof (u_int32_t));
  *metric = atoi (arg);

  if(*metric > 0)
    return metric;

  XFREE (MTYPE_ROUTE_MAP_COMPILED, metric);
  return NULL;
}

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

/* Route map commands for metric matching. */
struct route_map_rule_cmd route_match_metric_cmd =
{
  "metric",
  route_match_metric,
  route_match_metric_compile,
  route_match_metric_free
};

/* `match interface IFNAME' */
/* Match function return 1 if match is success else return zero. */
route_map_result_t
route_match_interface (void *rule, struct prefix *prefix,
		       route_map_object_t type, void *object)
{
  struct rip_info *rinfo;
  struct interface *ifp;
  char *ifname;

  if (type == RMAP_RIP)
    {
      ifname = rule;
      ifp = if_lookup_by_name(ifname);

      if (!ifp)
	return RMAP_NOMATCH;

      rinfo = object;

      if (rinfo->ifindex_out == ifp->ifindex)
	return RMAP_MATCH;
      else
	return RMAP_NOMATCH;
    }
  return RMAP_NOMATCH;
}

/* Route map `match interface' match statement. `arg' is IFNAME value */
/* XXX I don`t know if I need to check does interface exist? */
void *
route_match_interface_compile (char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

/* Free route map's compiled `match interface' value. */
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
};

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

/* Match function return 1 if match is success else return zero. */
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 rip_info *rinfo;
  struct prefix_ipv4 p;

  if (type == RMAP_RIP)
    {
      rinfo = object;
      p.family = AF_INET;
      p.prefix = rinfo->nexthop;
      p.prefixlen = IPV4_MAX_BITLEN;

      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. */
void *
route_match_ip_next_hop_compile (char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

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

/* Route map commands for ip next-hop matching. */
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' */

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 rip_info *rinfo;
  struct prefix_ipv4 p;

  if (type == RMAP_RIP)
    {
      rinfo = object;
      p.family = AF_INET;
      p.prefix = rinfo->nexthop;
      p.prefixlen = IPV4_MAX_BITLEN;

      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;
}

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

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

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. */
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_RIP)
    {
      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. */
void *
route_match_ip_address_compile (char *arg)
{
  return XSTRDUP (MTYPE_ROUTE_MAP_COMPILED, arg);
}

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

/* Route map commands for ip address matching. */
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' */

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_RIP)
    {
      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;
}

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

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

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 metric METRIC' */

/* Set metric to attribute. */
route_map_result_t
route_set_metric (void *rule, struct prefix *prefix, 
		  route_map_object_t type, void *object)
{
  u_int32_t *metric;
  struct rip_info *rinfo;

  if (type == RMAP_RIP)
    {