tunnel.h

mobile ip 在linux下的一种实现

/* $Id: tunnel.h,v 1.34 2001/02/25 09:37:22 jm Exp $
 * Tunnel interface header
 *
 * Dynamic hierarchial IP tunnel
 * Copyright (C) 1998-2001, Dynamics group
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See README and COPYING for
 * more details.
 */

#ifndef TUNNEL_H
#define TUNNEL_H

#include <net/if.h> /* for IFNAMSIZ */
#include <sys/time.h>
#include <unistd.h>

#include "message.h"
#include "hashtable.h"

#define TUNNEL_NO_ENCAPS 0
#define TUNNEL_IPIP 1
#define TUNNEL_GRE 2

#define TUNNEL_NOT_CONNECTED 0
#define TUNNEL_UP 1
#define TUNNEL_DOWN 2

/* how often (interval in seconds) delayed deletion checking should be forced
 * (can be done more often if agent is processing commands) */
#define TUNNEL_DELAYED_CHECK_INTERVAL 3

struct tunnel {
	struct node hashnode;
	char device[IFNAMSIZ]; /* tunnel device name */
	int number; /* tunnel device number */
	struct in_addr dst_addr; /* destination of the tunnel */
	int to_ha_table_id; /* routing table which has a default
			     * route to this tunnel (MN=>HA data)
			     * -1 = no routing table associated */
	int to_mn_table_id; /* routing table which has the MN host routes for
			     * data from this tunnel
			     * -1 = no routing table associated */
	int ref; /* number of references to this tunnel (do not remove the
		  * tunnel, if greater than zero */
	struct timeval zero_ref_tstamp; /* delay tunnel deletion */
	int type; /* IPIP, GRE */
	__u32 key; /* key for GRE tunnels */
	int direction; /* TUNNEL_UP / TUNNEL_DOWN for connected tunnels */
	int do_not_remove; /* 1 = leave the tunnel up even if ref == 0
			    * (used mainly for the default IPIP up tunnel in
			    * the lower FAs) */
};

struct tunnel_key {
	struct in_addr dst_addr;      /* destination of the tunnel */
	int type; /* IPIP, GRE */
	__u32 key; /* key for GRE tunnels */
};

typedef struct tunnel TUNNEL;
typedef struct hashtable HASH;

HASH *tunnel_init(char *start_dev, int table_start, int table_end);
int tunnel_destroy_hash(HASH *hash);
void tunnel_check_delayed(HASH *hash, int force);
int tunnel_delete_ptr(TUNNEL *data, int force);
int tunnel_delete(HASH *hash, struct in_addr dst_addr, int force, int type,
		  __u32 key);
TUNNEL *tunnel_fetch(HASH *hash, struct in_addr dst_addr, int type, __u32 key);
TUNNEL *tunnel_add(HASH *hash, struct in_addr dst_addr, char *dev,
		   struct in_addr local_addr, int set_link_up, int type,
		   int key);
void tunnel_set_remove(TUNNEL *tunl, int remove);
void tunnel_set_remove_all(HASH *hash, struct in_addr dst_addr);
int tunnel_connect(TUNNEL *up, TUNNEL *down, struct in_addr mn_addr,
		   int reverse, char *force_route_dev,
		   char *force_reverse_dev);
int tunnel_unconnect(TUNNEL *up, TUNNEL *down, struct in_addr mn_addr,
		     int reverse, int force, char *force_route_dev,
		     char *force_reverse_dev);
int tunnel_delayed_exists(HASH *hash);

#endif