mn.h

mobile ip 在linux下的一种实现

/* $Id: mn.h,v 1.95 2001/09/30 09:00:48 jm Exp $
 * Header files for Mobile Node module
 *
 * 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 MN_H
#define MN_H

#include "config.h"

#include <stdio.h>
#include <syslog.h>
#include <asm/types.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#ifdef DYN_TARGET_LINUX
#if 1
/* linux/wireless.h does not like net/if.h and wireless.h is not available
 * from glibc :( */
#include <linux/if.h>
#else
#include <net/if.h>
#endif
#endif
#ifdef DYN_TARGET_WINDOWS
#include "windows_extra.h"
#endif

#include "message.h"
#include "list.h"
#include "mn_agentadv.h"
#include "dyn_api.h"
#include "dyn_ip.h"

/* defines */

#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif

#define DEBUG_MESSAGES 'M'
#define DEBUG_STATES 'S'
#define DEBUG_INFO 'I'
#define DEBUG_API 'A'
#define DEBUG_AGENTADV '1'
#define DEBUG_HANDLERS '2'
#define DEBUG_TIMERS 't'

/* Comment this out, if you do not want to mess your
 * routing table during testing. (for example remotely) */
#define MN_ENABLE_TUNNELING

/* Comment out for running tests without message validation */
#define MN_ENABLE_VALIDATION

/* minimum time that must pass between two registration requests/solicitations
 * in microseconds (default: 1000000 usec = 1 sec)
 * Location update signal with API call clears the timers, so this does not
 * limit the locupd frequency */
#define MIN_REGISTRATION_DELAY 1000000
#define MIN_SOLICITATION_DELAY 1000000

#define ASSERT assert
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#define LOG2(lev, fmt, args...) { DEBUG(DEBUG_INFO, fmt, ## args); \
  syslog(lev, fmt, ## args); }

/* Maximum message length */
#define MAXMSG 2048

#define MAX_INTERFACES 10
#define DEFAULT_INTERFACE_PRIORITY 100

#define SYSLOG_IDENT                        "mobile node"
#define SYSLOG_OPTIONS                      LOG_PID | LOG_CONS

/* general timer */
#define TIMER_GEN                           0
/* tunnel lifetime */
#define TIMER_LIFETIME                      1
/* lifetime of last advertisement */
#define TIMER_ADV                           2
/* time when last registration request was sent */
#define TIMER_REQUEST                       3
/* timer for next reregistration */
#define TIMER_REREG                         4
/* timer for wireless LAN AP handoff detection */
#define TIMER_WLAN_AP_POLL                  5
/* timer for agent solicitation sending */
#define TIMER_SOLICITATION                  6
#define TIMER_COUNT                         7


/* registration request types */
#define REG_DISC       0
#define REG_CONNECT    1
#define REG_REREG      2

/* connect types:
*   CON_HA: Connection approved by Home Agent
*   CON_FA: Connection approved by Foreign Agent */
#define CON_HA 0
#define CON_FA 1

/* state entry types */
#define STATE_INIT    0
#define STATE_TIMEOUT 1

/* number of seconds that the tunnel to the old FA is kept alive */
#define OLD_TUNNEL_EXTRA_TIME 3

/* Registration retry interval in seconds
 * Min interval is used as initial reply interval, but for each
 * successive retry, the timeout is doubled until
 * max time is reached */
#define MIN_REGISTRATION_TIME  1
#define MAX_REGISTRATION_TIME  32

#define DEREGISTRATION_INTERVAL 8

/* 10% priority degrade when first registration request fails */
#define DEFAULT_PRIO_DEGRADE_INITIAL 10    

/* Additional degrades: multiply last one. 
   E.g. 10%, 20%, 40%, 80%, 100% */
#define DEFAULT_PRIO_DEGRADE_FACTOR 2 

/* When agent advertisements are heard, degrade the priority
   degradation value by 10% (0.9) */
#define DEFAULT_PRIO_DEGRADE_DEGRADE 0.9  

/* Additional degrade percentage if mobility agent does not reply to a periodic
 * solicitation (add this to adv->prio_degrade_percent) */
#define SOLICITATION_PRIO_DEGRADE 10

/* Number of microseconds to wait for agent advertisement before considering
 * mobility agent not to have replied to agent solicitation */
#define MAX_AGENTSOL_REPLY_WAIT 1500000

/* Solicitation intervals in seconds (see RFC 2002, sec. 2.4) */
#define SOLICITATION_INTERVALS {1, 1, 1, 2, 4, 8, 16, 32, 64}

/* Randomized delay added to solicitation interval in usecs
 * (0 .. MAX_RANDOM_SOLICITATION_DELAY usecs is added to the delay)
 */
#define MAX_RANDOM_SOLICITATION_DELAY 500000

/* Normal reregistration time in seconds before tunnel lifetime ends */
#define NORMAL_REREGISTRATION_TIME  32

/* Re-register via AAA MN_AAA_REG_TIME seconds before expiration of dynamic
 * security association */
#define MN_AAA_REG_TIME 15

/* Max number of deregistration messages sent to HA in state Close for home */
#define MAX_DEREGISTRATION_TO_HA 5

/* Minimum allowed lifetime (in seconds) */
#define MIN_ALLOWED_LIFETIME  1

/* Maximum errors allowed during registration with HA */
#define MAX_HA_ERRORS 5


#define MN_CONF_FILE         "dynmnd.conf"
#define MN_LOCAL_CONF_FILE   MN_CONF_FILE
#define MN_GLOBAL_CONF_FILE  SYSCONFDIR "/" MN_CONF_FILE
/* The process id of the daemon is saved here to make it easier to
   kill the correct daemon when necessary. */
#define MN_PID_FILE           PIDDIR "/dynmnd.pid"

#define MAXFILENAMELEN                      256
#define MAXSHAREDSECRETLEN                  32
#define MAXDEVICENAMELEN                    80
#define MAXOWNERNAMELEN                     8
#define MAXGROUPNAMELEN                     8
#define MAXROUTELEN                         256

#define MN_DEFAULT_TUNNEL_LIFETIME          400
#define MN_DEFAULT_SYSLOG_FACILITY          LOG_LOCAL0

/* Uncomment this to bind UDP socket to a configurable
 * (dynmnd.conf: BindAddress, BindPort) address.
 * This can be used for testing several MNs on one machine with multiple alias
 * addressed. */
/* #define BIND_UDP_SOCKET */


#define MNDECAPS_ROUTE_DEFAULT 0
#define MNDECAPS_ROUTE_HOME_NET 1
#define MNDECAPS_ROUTE_NONE 2

#define TUNMODE_AUTO_REVERSE 1
#define TUNMODE_AUTO_TRIANGLE 2
#define TUNMODE_REVERSE 3
#define TUNMODE_TRIANGLE 4


/* States */

enum mobile_state {
	MN_STARTUP,
	MN_DISCONNECTED,
	MN_FIND_AGENT,
	MN_PASSIVE_FIND,
	MN_REQUEST_TUNNEL,
	MN_CONNECTED,
	MN_CLOSE_FOR_HOME,
	MN_AT_HOME,
	MN_ERROR,
	MN_STOP,
	MN_STATE_COUNT
};


/* structures */

struct fa_spi_entry {
	struct node node;
	int spi;
	struct in_addr addr;
	int alg;
	unsigned char shared_secret[MAXSHAREDSECRETLEN];
	int shared_secret_len;
	time_t created; /* 0:  static security association,
			 * != 0: timestamp of dynamic security association */
	unsigned int lifetime; /* for dynamic security associations:
				* lifetime of the key in seconds */
};

struct ignore_iflist_entry {
	struct node node;
	char ifname[IFNAMSIZ];
};

struct dev_prio_entry {
	struct node node;
	int priority;
	unsigned char name[MAXDEVICENAMELEN];
};

struct alt_ha_entry {
	struct node node;
	struct in_addr addr;
};

struct mn_config {
	struct in_addr mn_home_ip_addr, mn_home_ip_addr_orig;
	struct in_addr ha_ip_addr, ha_ip_addr_orig;
	struct list alt_ha_ip_addrs;
	int use_hadisc;
	struct in_addr home_net_addr;
	int home_net_addr_plen;
	struct in_addr home_net_subnet_bc; /* from home_net_addr/plen */
	struct in_addr home_net_gateway;
	int mndecaps_route_handling;
	unsigned char shared_secret[MAXSHAREDSECRETLEN];
	int shared_secret_len;
	int spi;
	int auth_alg;