include/net/x25.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  *	Declarations of X.25 Packet Layer type objects.
  *
  * 	History
  *	nov/17/96	Jonathan Naylor	  Initial version.
  *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities
  *					  negotiation.
  */

 #ifndef _X25_H
 #define _X25_H
 #include <linux/x25.h>
 #include <linux/slab.h>
 #include <linux/refcount.h>
 #include <net/sock.h>

 #define	X25_ADDR_LEN			16

 #define	X25_MAX_L2_LEN			18	/* 802.2 LLC */

 #define	X25_STD_MIN_LEN			3
 #define	X25_EXT_MIN_LEN			4

 #define	X25_GFI_SEQ_MASK		0x30
 #define	X25_GFI_STDSEQ			0x10
 #define	X25_GFI_EXTSEQ			0x20

 #define	X25_Q_BIT			0x80
 #define	X25_D_BIT			0x40
 #define	X25_STD_M_BIT			0x10
 #define	X25_EXT_M_BIT			0x01

 #define	X25_CALL_REQUEST		0x0B
 #define	X25_CALL_ACCEPTED		0x0F
 #define	X25_CLEAR_REQUEST		0x13
 #define	X25_CLEAR_CONFIRMATION		0x17
 #define	X25_DATA			0x00
 #define	X25_INTERRUPT			0x23
 #define	X25_INTERRUPT_CONFIRMATION	0x27
 #define	X25_RR				0x01
 #define	X25_RNR				0x05
 #define	X25_REJ				0x09
 #define	X25_RESET_REQUEST		0x1B
 #define	X25_RESET_CONFIRMATION		0x1F
 #define	X25_REGISTRATION_REQUEST	0xF3
 #define	X25_REGISTRATION_CONFIRMATION	0xF7
 #define	X25_RESTART_REQUEST		0xFB
 #define	X25_RESTART_CONFIRMATION	0xFF
 #define	X25_DIAGNOSTIC			0xF1
 #define	X25_ILLEGAL			0xFD

 /* Define the various conditions that may exist */

 #define	X25_COND_ACK_PENDING	0x01
 #define	X25_COND_OWN_RX_BUSY	0x02
 #define	X25_COND_PEER_RX_BUSY	0x04

 /* Define Link State constants. */
 enum {
 	X25_STATE_0,		/* Ready */
 	X25_STATE_1,		/* Awaiting Call Accepted */
 	X25_STATE_2,		/* Awaiting Clear Confirmation */
 	X25_STATE_3,		/* Data Transfer */
 	X25_STATE_4		/* Awaiting Reset Confirmation */
 };

 enum {
 	X25_LINK_STATE_0,
 	X25_LINK_STATE_1,
 	X25_LINK_STATE_2,
 	X25_LINK_STATE_3
 };

 #define X25_DEFAULT_T20		(180 * HZ)		/* Default T20 value */
 #define X25_DEFAULT_T21		(200 * HZ)		/* Default T21 value */
 #define X25_DEFAULT_T22		(180 * HZ)		/* Default T22 value */
 #define	X25_DEFAULT_T23		(180 * HZ)		/* Default T23 value */
 #define	X25_DEFAULT_T2		(3   * HZ)		/* Default ack holdback value */

 #define	X25_DEFAULT_WINDOW_SIZE	2			/* Default Window Size	*/
 #define	X25_DEFAULT_PACKET_SIZE	X25_PS128		/* Default Packet Size */
 #define	X25_DEFAULT_THROUGHPUT	0x0A			/* Deafult Throughput */
 #define	X25_DEFAULT_REVERSE	0x00			/* Default Reverse Charging */

 #define X25_SMODULUS 		8
 #define	X25_EMODULUS		128

 /*
  *	X.25 Facilities constants.
  */

 #define	X25_FAC_CLASS_MASK	0xC0

 #define	X25_FAC_CLASS_A		0x00
 #define	X25_FAC_CLASS_B		0x40
 #define	X25_FAC_CLASS_C		0x80
 #define	X25_FAC_CLASS_D		0xC0

 #define	X25_FAC_REVERSE		0x01			/* also fast select */
 #define	X25_FAC_THROUGHPUT	0x02
 #define	X25_FAC_PACKET_SIZE	0x42
 #define	X25_FAC_WINDOW_SIZE	0x43

 #define X25_MAX_FAC_LEN 	60
 #define	X25_MAX_CUD_LEN		128

 #define X25_FAC_CALLING_AE 	0xCB
 #define X25_FAC_CALLED_AE 	0xC9

 #define X25_MARKER 		0x00
 #define X25_DTE_SERVICES 	0x0F
 #define X25_MAX_AE_LEN 		40			/* Max num of semi-octets in AE - OSI Nw */
 #define X25_MAX_DTE_FACIL_LEN	21			/* Max length of DTE facility params */

 /* Bitset in x25_sock->flags for misc flags */
 #define X25_Q_BIT_FLAG		0
 #define X25_INTERRUPT_FLAG	1
 #define X25_ACCPT_APPRV_FLAG	2

 /**
  *	struct x25_route - x25 routing entry
  *	@node - entry in x25_list_lock
  *	@address - Start of address range
  *	@sigdigits - Number of sig digits
  *	@dev - More than one for MLP
  *	@refcnt - reference counter
  */
 struct x25_route {
 	struct list_head	node;
 	struct x25_address	address;
 	unsigned int		sigdigits;
 	struct net_device	*dev;
 	refcount_t		refcnt;
 };

 struct x25_neigh {
 	struct list_head	node;
 	struct net_device	*dev;
 	unsigned int		state;
 	unsigned int		extended;
 	struct sk_buff_head	queue;
 	unsigned long		t20;
 	struct timer_list	t20timer;
 	unsigned long		global_facil_mask;
 	refcount_t		refcnt;
 };

 struct x25_sock {
 	struct sock		sk;
 	struct x25_address	source_addr, dest_addr;
 	struct x25_neigh	*neighbour;
 	unsigned int		lci, cudmatchlength;
 	unsigned char		state, condition;
 	unsigned short		vs, vr, va, vl;
 	unsigned long		t2, t21, t22, t23;
 	unsigned short		fraglen;
 	unsigned long		flags;
 	struct sk_buff_head	ack_queue;
 	struct sk_buff_head	fragment_queue;
 	struct sk_buff_head	interrupt_in_queue;
 	struct sk_buff_head	interrupt_out_queue;
 	struct timer_list	timer;
 	struct x25_causediag	causediag;
 	struct x25_facilities	facilities;
 	struct x25_dte_facilities dte_facilities;
 	struct x25_calluserdata	calluserdata;
 	unsigned long 		vc_facil_mask;	/* inc_call facilities mask */
 };

 struct x25_forward {
 	struct list_head	node;
 	unsigned int		lci;
 	struct net_device	*dev1;
 	struct net_device	*dev2;
 	atomic_t		refcnt;
 };

 static inline struct x25_sock *x25_sk(const struct sock *sk)
 {
 	return (struct x25_sock *)sk;
 }

 /* af_x25.c */
 extern int  sysctl_x25_restart_request_timeout;
 extern int  sysctl_x25_call_request_timeout;
 extern int  sysctl_x25_reset_request_timeout;
 extern int  sysctl_x25_clear_request_timeout;
 extern int  sysctl_x25_ack_holdback_timeout;
 extern int  sysctl_x25_forward;

 int x25_parse_address_block(struct sk_buff *skb,
 			    struct x25_address *called_addr,
 			    struct x25_address *calling_addr);

 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
 struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
 void x25_destroy_socket_from_timer(struct sock *);
 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
 void x25_kill_by_neigh(struct x25_neigh *);

 /* x25_dev.c */
 void x25_send_frame(struct sk_buff *, struct x25_neigh *);
 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
 			   struct packet_type *, struct net_device *);
 void x25_establish_link(struct x25_neigh *);
 void x25_terminate_link(struct x25_neigh *);

 /* x25_facilities.c */
 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
 			 struct x25_dte_facilities *, unsigned long *);
 int x25_create_facilities(unsigned char *, struct x25_facilities *,
 			  struct x25_dte_facilities *, unsigned long);
 int x25_negotiate_facilities(struct sk_buff *, struct sock *,
 			     struct x25_facilities *,
 			     struct x25_dte_facilities *);
 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);

 /* x25_forward.c */
 void x25_clear_forward_by_lci(unsigned int lci);
 void x25_clear_forward_by_dev(struct net_device *);
 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
 		     int);

 /* x25_in.c */
 int x25_process_rx_frame(struct sock *, struct sk_buff *);
 int x25_backlog_rcv(struct sock *, struct sk_buff *);

 /* x25_link.c */
 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
 void x25_link_device_up(struct net_device *);
 void x25_link_device_down(struct net_device *);
 void x25_link_established(struct x25_neigh *);
 void x25_link_terminated(struct x25_neigh *);
 void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
 				unsigned char);
 void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
 int x25_subscr_ioctl(unsigned int, void __user *);
 struct x25_neigh *x25_get_neigh(struct net_device *);
 void x25_link_free(void);

 /* x25_neigh.c */
 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
 {
 	refcount_inc(&nb->refcnt);
 }

 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
 {
 	if (refcount_dec_and_test(&nb->refcnt))
 		kfree(nb);
 }

 /* x25_out.c */
 int x25_output(struct sock *, struct sk_buff *);
 void x25_kick(struct sock *);
 void x25_enquiry_response(struct sock *);

 /* x25_route.c */
 struct x25_route *x25_get_route(struct x25_address *addr);
 struct net_device *x25_dev_get(char *);
 void x25_route_device_down(struct net_device *dev);
 int x25_route_ioctl(unsigned int, void __user *);
 void x25_route_free(void);

 static __inline__ void x25_route_hold(struct x25_route *rt)
 {
 	refcount_inc(&rt->refcnt);
 }

 static __inline__ void x25_route_put(struct x25_route *rt)
 {
 	if (refcount_dec_and_test(&rt->refcnt))
 		kfree(rt);
 }

 /* x25_subr.c */
 void x25_clear_queues(struct sock *);
 void x25_frames_acked(struct sock *, unsigned short);
 void x25_requeue_frames(struct sock *);
 int x25_validate_nr(struct sock *, unsigned short);
 void x25_write_internal(struct sock *, int);
 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
 	       int *);
 void x25_disconnect(struct sock *, int, unsigned char, unsigned char);

 /* x25_timer.c */
 void x25_init_timers(struct sock *sk);
 void x25_start_heartbeat(struct sock *);
 void x25_start_t2timer(struct sock *);
 void x25_start_t21timer(struct sock *);
 void x25_start_t22timer(struct sock *);
 void x25_start_t23timer(struct sock *);
 void x25_stop_heartbeat(struct sock *);
 void x25_stop_timer(struct sock *);
 unsigned long x25_display_timer(struct sock *);
 void x25_check_rbuf(struct sock *);

 /* sysctl_net_x25.c */
 #ifdef CONFIG_SYSCTL
 int x25_register_sysctl(void);
 void x25_unregister_sysctl(void);
 #else
 static inline int x25_register_sysctl(void) { return 0; };
 static inline void x25_unregister_sysctl(void) {};
 #endif /* CONFIG_SYSCTL */

 struct x25_skb_cb {
 	unsigned int flags;
 };
 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))

 extern struct hlist_head x25_list;
 extern rwlock_t x25_list_lock;
 extern struct list_head x25_route_list;
 extern rwlock_t x25_route_list_lock;
 extern struct list_head x25_forward_list;
 extern rwlock_t x25_forward_list_lock;
 extern struct list_head x25_neigh_list;
 extern rwlock_t x25_neigh_list_lock;

 int x25_proc_init(void);
 void x25_proc_exit(void);
 #endif
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* Declarations of X.25 Packet Layer type objects.
	*
	* History
	* nov/17/96 Jonathan Naylor Initial version.
	* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
	* negotiation.
	*/

	#ifndef _X25_H
	#define _X25_H
	#include <linux/x25.h>
	#include <linux/slab.h>
	#include <linux/refcount.h>
	#include <net/sock.h>

	#define X25_ADDR_LEN 16

	#define X25_MAX_L2_LEN 18 /* 802.2 LLC */

	#define X25_STD_MIN_LEN 3
	#define X25_EXT_MIN_LEN 4

	#define X25_GFI_SEQ_MASK 0x30
	#define X25_GFI_STDSEQ 0x10
	#define X25_GFI_EXTSEQ 0x20

	#define X25_Q_BIT 0x80
	#define X25_D_BIT 0x40
	#define X25_STD_M_BIT 0x10
	#define X25_EXT_M_BIT 0x01

	#define X25_CALL_REQUEST 0x0B
	#define X25_CALL_ACCEPTED 0x0F
	#define X25_CLEAR_REQUEST 0x13
	#define X25_CLEAR_CONFIRMATION 0x17
	#define X25_DATA 0x00
	#define X25_INTERRUPT 0x23
	#define X25_INTERRUPT_CONFIRMATION 0x27
	#define X25_RR 0x01
	#define X25_RNR 0x05
	#define X25_REJ 0x09
	#define X25_RESET_REQUEST 0x1B
	#define X25_RESET_CONFIRMATION 0x1F
	#define X25_REGISTRATION_REQUEST 0xF3
	#define X25_REGISTRATION_CONFIRMATION 0xF7
	#define X25_RESTART_REQUEST 0xFB
	#define X25_RESTART_CONFIRMATION 0xFF
	#define X25_DIAGNOSTIC 0xF1
	#define X25_ILLEGAL 0xFD

	/* Define the various conditions that may exist */

	#define X25_COND_ACK_PENDING 0x01
	#define X25_COND_OWN_RX_BUSY 0x02
	#define X25_COND_PEER_RX_BUSY 0x04

	/* Define Link State constants. */
	enum {
	X25_STATE_0, /* Ready */
	X25_STATE_1, /* Awaiting Call Accepted */
	X25_STATE_2, /* Awaiting Clear Confirmation */
	X25_STATE_3, /* Data Transfer */
	X25_STATE_4 /* Awaiting Reset Confirmation */
	};

	enum {
	X25_LINK_STATE_0,
	X25_LINK_STATE_1,
	X25_LINK_STATE_2,
	X25_LINK_STATE_3
	};

	#define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */
	#define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */
	#define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */
	#define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */
	#define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */

	#define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */
	#define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */
	#define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */
	#define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */

	#define X25_SMODULUS 8
	#define X25_EMODULUS 128

	/*
	* X.25 Facilities constants.
	*/

	#define X25_FAC_CLASS_MASK 0xC0

	#define X25_FAC_CLASS_A 0x00
	#define X25_FAC_CLASS_B 0x40
	#define X25_FAC_CLASS_C 0x80
	#define X25_FAC_CLASS_D 0xC0

	#define X25_FAC_REVERSE 0x01 /* also fast select */
	#define X25_FAC_THROUGHPUT 0x02
	#define X25_FAC_PACKET_SIZE 0x42
	#define X25_FAC_WINDOW_SIZE 0x43

	#define X25_MAX_FAC_LEN 60
	#define X25_MAX_CUD_LEN 128

	#define X25_FAC_CALLING_AE 0xCB
	#define X25_FAC_CALLED_AE 0xC9

	#define X25_MARKER 0x00
	#define X25_DTE_SERVICES 0x0F
	#define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */
	#define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */

	/* Bitset in x25_sock->flags for misc flags */
	#define X25_Q_BIT_FLAG 0
	#define X25_INTERRUPT_FLAG 1
	#define X25_ACCPT_APPRV_FLAG 2

	/**
	* struct x25_route - x25 routing entry
	* @node - entry in x25_list_lock
	* @address - Start of address range
	* @sigdigits - Number of sig digits
	* @dev - More than one for MLP
	* @refcnt - reference counter
	*/
	struct x25_route {
	struct list_head node;
	struct x25_address address;
	unsigned int sigdigits;
	struct net_device *dev;
	refcount_t refcnt;
	};

	struct x25_neigh {
	struct list_head node;
	struct net_device *dev;
	unsigned int state;
	unsigned int extended;
	struct sk_buff_head queue;
	unsigned long t20;
	struct timer_list t20timer;
	unsigned long global_facil_mask;
	refcount_t refcnt;
	};

	struct x25_sock {
	struct sock sk;
	struct x25_address source_addr, dest_addr;
	struct x25_neigh *neighbour;
	unsigned int lci, cudmatchlength;
	unsigned char state, condition;
	unsigned short vs, vr, va, vl;
	unsigned long t2, t21, t22, t23;
	unsigned short fraglen;
	unsigned long flags;
	struct sk_buff_head ack_queue;
	struct sk_buff_head fragment_queue;
	struct sk_buff_head interrupt_in_queue;
	struct sk_buff_head interrupt_out_queue;
	struct timer_list timer;
	struct x25_causediag causediag;
	struct x25_facilities facilities;
	struct x25_dte_facilities dte_facilities;
	struct x25_calluserdata calluserdata;
	unsigned long vc_facil_mask; /* inc_call facilities mask */
	};

	struct x25_forward {
	struct list_head node;
	unsigned int lci;
	struct net_device *dev1;
	struct net_device *dev2;
	atomic_t refcnt;
	};

	static inline struct x25_sock x25_sk(const struct sock sk)
	{
	return (struct x25_sock *)sk;
	}

	/* af_x25.c */
	extern int sysctl_x25_restart_request_timeout;
	extern int sysctl_x25_call_request_timeout;
	extern int sysctl_x25_reset_request_timeout;
	extern int sysctl_x25_clear_request_timeout;
	extern int sysctl_x25_ack_holdback_timeout;
	extern int sysctl_x25_forward;

	int x25_parse_address_block(struct sk_buff *skb,
	struct x25_address *called_addr,
	struct x25_address *calling_addr);

	int x25_addr_ntoa(unsigned char , struct x25_address , struct x25_address *);
	int x25_addr_aton(unsigned char , struct x25_address , struct x25_address *);
	struct sock x25_find_socket(unsigned int, struct x25_neigh );
	void x25_destroy_socket_from_timer(struct sock *);
	int x25_rx_call_request(struct sk_buff , struct x25_neigh , unsigned int);
	void x25_kill_by_neigh(struct x25_neigh *);

	/* x25_dev.c */
	void x25_send_frame(struct sk_buff , struct x25_neigh );
	int x25_lapb_receive_frame(struct sk_buff , struct net_device ,
	struct packet_type , struct net_device );
	void x25_establish_link(struct x25_neigh *);
	void x25_terminate_link(struct x25_neigh *);

	/* x25_facilities.c */
	int x25_parse_facilities(struct sk_buff , struct x25_facilities ,
	struct x25_dte_facilities , unsigned long );
	int x25_create_facilities(unsigned char , struct x25_facilities ,
	struct x25_dte_facilities *, unsigned long);
	int x25_negotiate_facilities(struct sk_buff , struct sock ,
	struct x25_facilities *,
	struct x25_dte_facilities *);
	void x25_limit_facilities(struct x25_facilities , struct x25_neigh );

	/* x25_forward.c */
	void x25_clear_forward_by_lci(unsigned int lci);
	void x25_clear_forward_by_dev(struct net_device *);
	int x25_forward_data(int, struct x25_neigh , struct sk_buff );
	int x25_forward_call(struct x25_address , struct x25_neigh , struct sk_buff *,
	int);

	/* x25_in.c */
	int x25_process_rx_frame(struct sock , struct sk_buff );
	int x25_backlog_rcv(struct sock , struct sk_buff );

	/* x25_link.c */
	void x25_link_control(struct sk_buff , struct x25_neigh , unsigned short);
	void x25_link_device_up(struct net_device *);
	void x25_link_device_down(struct net_device *);
	void x25_link_established(struct x25_neigh *);
	void x25_link_terminated(struct x25_neigh *);
	void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
	unsigned char);
	void x25_transmit_link(struct sk_buff , struct x25_neigh );
	int x25_subscr_ioctl(unsigned int, void __user *);
	struct x25_neigh x25_get_neigh(struct net_device );
	void x25_link_free(void);

	/* x25_neigh.c */
	static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
	{
	refcount_inc(&nb->refcnt);
	}

	static __inline__ void x25_neigh_put(struct x25_neigh *nb)
	{
	if (refcount_dec_and_test(&nb->refcnt))
	kfree(nb);
	}

	/* x25_out.c */
	int x25_output(struct sock , struct sk_buff );
	void x25_kick(struct sock *);
	void x25_enquiry_response(struct sock *);

	/* x25_route.c */
	struct x25_route x25_get_route(struct x25_address addr);
	struct net_device x25_dev_get(char );
	void x25_route_device_down(struct net_device *dev);
	int x25_route_ioctl(unsigned int, void __user *);
	void x25_route_free(void);

	static __inline__ void x25_route_hold(struct x25_route *rt)
	{
	refcount_inc(&rt->refcnt);
	}

	static __inline__ void x25_route_put(struct x25_route *rt)
	{
	if (refcount_dec_and_test(&rt->refcnt))
	kfree(rt);
	}

	/* x25_subr.c */
	void x25_clear_queues(struct sock *);
	void x25_frames_acked(struct sock *, unsigned short);
	void x25_requeue_frames(struct sock *);
	int x25_validate_nr(struct sock *, unsigned short);
	void x25_write_internal(struct sock *, int);
	int x25_decode(struct sock , struct sk_buff , int , int , int , int ,
	int *);
	void x25_disconnect(struct sock *, int, unsigned char, unsigned char);

	/* x25_timer.c */
	void x25_init_timers(struct sock *sk);
	void x25_start_heartbeat(struct sock *);
	void x25_start_t2timer(struct sock *);
	void x25_start_t21timer(struct sock *);
	void x25_start_t22timer(struct sock *);
	void x25_start_t23timer(struct sock *);
	void x25_stop_heartbeat(struct sock *);
	void x25_stop_timer(struct sock *);
	unsigned long x25_display_timer(struct sock *);
	void x25_check_rbuf(struct sock *);

	/* sysctl_net_x25.c */
	#ifdef CONFIG_SYSCTL
	int x25_register_sysctl(void);
	void x25_unregister_sysctl(void);
	#else
	static inline int x25_register_sysctl(void) { return 0; };
	static inline void x25_unregister_sysctl(void) {};
	#endif /* CONFIG_SYSCTL */

	struct x25_skb_cb {
	unsigned int flags;
	};
	#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))

	extern struct hlist_head x25_list;
	extern rwlock_t x25_list_lock;
	extern struct list_head x25_route_list;
	extern rwlock_t x25_route_list_lock;
	extern struct list_head x25_forward_list;
	extern rwlock_t x25_forward_list_lock;
	extern struct list_head x25_neigh_list;
	extern rwlock_t x25_neigh_list_lock;

	int x25_proc_init(void);
	void x25_proc_exit(void);
	#endif