[linux.git] / include / net / x25.h

/*
 *	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 <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;
	atomic_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;
	atomic_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;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

struct x25_skb_cb {
	unsigned 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;

extern int x25_proc_init(void);
extern void x25_proc_exit(void);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Declarations of X.25 Packet Layer type objects.
	3	*
	4	* History
	5	* nov/17/96 Jonathan Naylor Initial version.
	6	* mar/20/00 Daniela Squassoni Disabling/enabling of facilities
	7	* negotiation.
	8	*/
	9
	10	#ifndef _X25_H
	11	#define _X25_H
	12	#include <linux/x25.h>
5a0e3ad6	13	#include <linux/slab.h>
1da177e4 LT	14	#include <net/sock.h>
	15
	16	#define X25_ADDR_LEN 16
	17
	18	#define X25_MAX_L2_LEN 18 /* 802.2 LLC */
	19
	20	#define X25_STD_MIN_LEN 3
	21	#define X25_EXT_MIN_LEN 4
	22
	23	#define X25_GFI_SEQ_MASK 0x30
	24	#define X25_GFI_STDSEQ 0x10
	25	#define X25_GFI_EXTSEQ 0x20
	26
	27	#define X25_Q_BIT 0x80
	28	#define X25_D_BIT 0x40
	29	#define X25_STD_M_BIT 0x10
	30	#define X25_EXT_M_BIT 0x01
	31
	32	#define X25_CALL_REQUEST 0x0B
	33	#define X25_CALL_ACCEPTED 0x0F
	34	#define X25_CLEAR_REQUEST 0x13
	35	#define X25_CLEAR_CONFIRMATION 0x17
	36	#define X25_DATA 0x00
	37	#define X25_INTERRUPT 0x23
	38	#define X25_INTERRUPT_CONFIRMATION 0x27
	39	#define X25_RR 0x01
	40	#define X25_RNR 0x05
	41	#define X25_REJ 0x09
	42	#define X25_RESET_REQUEST 0x1B
	43	#define X25_RESET_CONFIRMATION 0x1F
	44	#define X25_REGISTRATION_REQUEST 0xF3
	45	#define X25_REGISTRATION_CONFIRMATION 0xF7
	46	#define X25_RESTART_REQUEST 0xFB
	47	#define X25_RESTART_CONFIRMATION 0xFF
	48	#define X25_DIAGNOSTIC 0xF1
	49	#define X25_ILLEGAL 0xFD
	50
	51	/* Define the various conditions that may exist */
	52
	53	#define X25_COND_ACK_PENDING 0x01
	54	#define X25_COND_OWN_RX_BUSY 0x02
	55	#define X25_COND_PEER_RX_BUSY 0x04
	56
	57	/* Define Link State constants. */
	58	enum {
	59	X25_STATE_0, /* Ready */
	60	X25_STATE_1, /* Awaiting Call Accepted */
	61	X25_STATE_2, /* Awaiting Clear Confirmation */
	62	X25_STATE_3, /* Data Transfer */
	63	X25_STATE_4 /* Awaiting Reset Confirmation */
	64	};
	65
	66	enum {
	67	X25_LINK_STATE_0,
	68	X25_LINK_STATE_1,
	69	X25_LINK_STATE_2,
	70	X25_LINK_STATE_3
	71	};
	72
	73	#define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */
	74	#define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */
	75	#define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */
	76	#define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */
	77	#define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */
78
79	#define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */
80	#define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */
81	#define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */
82	#define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */
83
84	#define X25_SMODULUS 8
85	#define X25_EMODULUS 128
86
87	/*
88	* X.25 Facilities constants.
89	*/
90
91	#define X25_FAC_CLASS_MASK 0xC0
92
93	#define X25_FAC_CLASS_A 0x00
94	#define X25_FAC_CLASS_B 0x40
95	#define X25_FAC_CLASS_C 0x80
96	#define X25_FAC_CLASS_D 0xC0
97
ebc3f64b	98	#define X25_FAC_REVERSE 0x01 /* also fast select */
1da177e4 LT	99	#define X25_FAC_THROUGHPUT 0x02
	100	#define X25_FAC_PACKET_SIZE 0x42
	101	#define X25_FAC_WINDOW_SIZE 0x43
	102
a64b7b93	103	#define X25_MAX_FAC_LEN 60
1da177e4 LT	104	#define X25_MAX_CUD_LEN 128
1da177e4 LT	105
a64b7b93 SP	106	#define X25_FAC_CALLING_AE 0xCB
	107	#define X25_FAC_CALLED_AE 0xC9
	108
	109	#define X25_MARKER 0x00
	110	#define X25_DTE_SERVICES 0x0F
	111	#define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */
	112	#define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */
	113
cb863ffd	114	/* Bitset in x25_sock->flags for misc flags */
cb863ffd	115	#define X25_Q_BIT_FLAG 0
b7792e34	116	#define X25_INTERRUPT_FLAG 1
37cda787	117	#define X25_ACCPT_APPRV_FLAG 2
cb863ffd	118
1da177e4 LT	119	/**
	120	* struct x25_route - x25 routing entry
	121	* @node - entry in x25_list_lock
	122	* @address - Start of address range
	123	* @sigdigits - Number of sig digits
	124	* @dev - More than one for MLP
	125	* @refcnt - reference counter
	126	*/
	127	struct x25_route {
	128	struct list_head node;
	129	struct x25_address address;
	130	unsigned int sigdigits;
	131	struct net_device *dev;
	132	atomic_t refcnt;
	133	};
	134
	135	struct x25_neigh {
	136	struct list_head node;
	137	struct net_device *dev;
	138	unsigned int state;
	139	unsigned int extended;
	140	struct sk_buff_head queue;
	141	unsigned long t20;
	142	struct timer_list t20timer;
	143	unsigned long global_facil_mask;
	144	atomic_t refcnt;
	145	};
	146
	147	struct x25_sock {
	148	struct sock sk;
	149	struct x25_address source_addr, dest_addr;
	150	struct x25_neigh *neighbour;
cb65d506	151	unsigned int lci, cudmatchlength;
37cda787	152	unsigned char state, condition;
1da177e4 LT	153	unsigned short vs, vr, va, vl;
	154	unsigned long t2, t21, t22, t23;
	155	unsigned short fraglen;
cb863ffd	156	unsigned long flags;
1da177e4 LT	157	struct sk_buff_head ack_queue;
	158	struct sk_buff_head fragment_queue;
	159	struct sk_buff_head interrupt_in_queue;
	160	struct sk_buff_head interrupt_out_queue;
	161	struct timer_list timer;
	162	struct x25_causediag causediag;
	163	struct x25_facilities facilities;
a64b7b93	164	struct x25_dte_facilities dte_facilities;
1da177e4 LT	165	struct x25_calluserdata calluserdata;
	166	unsigned long vc_facil_mask; /* inc_call facilities mask */
	167	};
	168
95a9dc43 AH	169	struct x25_forward {
	170	struct list_head node;
	171	unsigned int lci;
	172	struct net_device *dev1;
	173	struct net_device *dev2;
	174	atomic_t refcnt;
	175	};
	176
1da177e4 LT	177	static inline struct x25_sock x25_sk(const struct sock sk)
	178	{
	179	return (struct x25_sock *)sk;
	180	}
	181
	182	/* af_x25.c */
	183	extern int sysctl_x25_restart_request_timeout;
	184	extern int sysctl_x25_call_request_timeout;
	185	extern int sysctl_x25_reset_request_timeout;
	186	extern int sysctl_x25_clear_request_timeout;
	187	extern int sysctl_x25_ack_holdback_timeout;
39e21c0d	188	extern int sysctl_x25_forward;
1da177e4	189
f5eb917b JH	190	extern int x25_parse_address_block(struct sk_buff *skb,
	191	struct x25_address *called_addr,
	192	struct x25_address *calling_addr);
	193
1da177e4 LT	194	extern int x25_addr_ntoa(unsigned char , struct x25_address ,
	195	struct x25_address *);
	196	extern int x25_addr_aton(unsigned char , struct x25_address ,
	197	struct x25_address *);
	198	extern struct sock x25_find_socket(unsigned int, struct x25_neigh );
14ebaf81	199	extern void x25_destroy_socket_from_timer(struct sock *);
1da177e4 LT	200	extern int x25_rx_call_request(struct sk_buff , struct x25_neigh , unsigned int);
	201	extern void x25_kill_by_neigh(struct x25_neigh *);
	202
	203	/* x25_dev.c */
	204	extern void x25_send_frame(struct sk_buff , struct x25_neigh );
f2ccd8fa	205	extern int x25_lapb_receive_frame(struct sk_buff , struct net_device , struct packet_type , struct net_device );
1da177e4 LT	206	extern void x25_establish_link(struct x25_neigh *);
	207	extern void x25_terminate_link(struct x25_neigh *);
	208
	209	/* x25_facilities.c */
a64b7b93 SP	210	extern int x25_parse_facilities(struct sk_buff , struct x25_facilities ,
	211	struct x25_dte_facilities , unsigned long );
	212	extern int x25_create_facilities(unsigned char , struct x25_facilities ,
	213	struct x25_dte_facilities *, unsigned long);
	214	extern int x25_negotiate_facilities(struct sk_buff , struct sock ,
	215	struct x25_facilities *,
	216	struct x25_dte_facilities *);
1da177e4 LT	217	extern void x25_limit_facilities(struct x25_facilities , struct x25_neigh );
1da177e4 LT	218
95a9dc43 AH	219	/* x25_forward.c */
	220	extern void x25_clear_forward_by_lci(unsigned int lci);
	221	extern void x25_clear_forward_by_dev(struct net_device *);
	222	extern int x25_forward_data(int, struct x25_neigh , struct sk_buff );
	223	extern int x25_forward_call(struct x25_address , struct x25_neigh ,
	224	struct sk_buff *, int);
	225
1da177e4 LT	226	/* x25_in.c */
	227	extern int x25_process_rx_frame(struct sock , struct sk_buff );
	228	extern int x25_backlog_rcv(struct sock , struct sk_buff );
	229
	230	/* x25_link.c */
	231	extern void x25_link_control(struct sk_buff , struct x25_neigh , unsigned short);
	232	extern void x25_link_device_up(struct net_device *);
	233	extern void x25_link_device_down(struct net_device *);
	234	extern void x25_link_established(struct x25_neigh *);
	235	extern void x25_link_terminated(struct x25_neigh *);
	236	extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
	237	extern void x25_transmit_link(struct sk_buff , struct x25_neigh );
	238	extern int x25_subscr_ioctl(unsigned int, void __user *);
	239	extern struct x25_neigh x25_get_neigh(struct net_device );
	240	extern void x25_link_free(void);
	241
	242	/* x25_neigh.c */
	243	static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
	244	{
	245	atomic_inc(&nb->refcnt);
	246	}
	247
	248	static __inline__ void x25_neigh_put(struct x25_neigh *nb)
	249	{
	250	if (atomic_dec_and_test(&nb->refcnt))
	251	kfree(nb);
	252	}
	253
	254	/* x25_out.c */
	255	extern int x25_output(struct sock , struct sk_buff );
	256	extern void x25_kick(struct sock *);
	257	extern void x25_enquiry_response(struct sock *);
	258
	259	/* x25_route.c */
	260	extern struct x25_route x25_get_route(struct x25_address addr);
	261	extern struct net_device x25_dev_get(char );
	262	extern void x25_route_device_down(struct net_device *dev);
	263	extern int x25_route_ioctl(unsigned int, void __user *);
	264	extern void x25_route_free(void);
	265
	266	static __inline__ void x25_route_hold(struct x25_route *rt)
	267	{
	268	atomic_inc(&rt->refcnt);
	269	}
	270
	271	static __inline__ void x25_route_put(struct x25_route *rt)
	272	{
	273	if (atomic_dec_and_test(&rt->refcnt))
	274	kfree(rt);
	275	}
	276
	277	/* x25_subr.c */
	278	extern void x25_clear_queues(struct sock *);
	279	extern void x25_frames_acked(struct sock *, unsigned short);
	280	extern void x25_requeue_frames(struct sock *);
	281	extern int x25_validate_nr(struct sock *, unsigned short);
	282	extern void x25_write_internal(struct sock *, int);
	283	extern int x25_decode(struct sock , struct sk_buff , int , int , int , int , int *);
	284	extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
1da177e4 LT	285
1da177e4 LT	286	/* x25_timer.c */
7f18ba62	287	extern void x25_init_timers(struct sock *sk);
1da177e4 LT	288	extern void x25_start_heartbeat(struct sock *);
	289	extern void x25_start_t2timer(struct sock *);
	290	extern void x25_start_t21timer(struct sock *);
	291	extern void x25_start_t22timer(struct sock *);
	292	extern void x25_start_t23timer(struct sock *);
	293	extern void x25_stop_heartbeat(struct sock *);
	294	extern void x25_stop_timer(struct sock *);
	295	extern unsigned long x25_display_timer(struct sock *);
	296	extern void x25_check_rbuf(struct sock *);
	297
	298	/* sysctl_net_x25.c */
2f5517ae	299	#ifdef CONFIG_SYSCTL
1da177e4 LT	300	extern void x25_register_sysctl(void);
1da177e4 LT	301	extern void x25_unregister_sysctl(void);
2f5517ae	302	#else
	303	static inline void x25_register_sysctl(void) {};
	304	static inline void x25_unregister_sysctl(void) {};
	305	#endif /* CONFIG_SYSCTL */
	306
1da177e4 LT	307	struct x25_skb_cb {
	308	unsigned flags;
	309	};
	310	#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
	311
	312	extern struct hlist_head x25_list;
	313	extern rwlock_t x25_list_lock;
	314	extern struct list_head x25_route_list;
	315	extern rwlock_t x25_route_list_lock;
95a9dc43 AH	316	extern struct list_head x25_forward_list;
95a9dc43 AH	317	extern rwlock_t x25_forward_list_lock;
5595a1a5	318	extern struct list_head x25_neigh_list;
5595a1a5	319	extern rwlock_t x25_neigh_list_lock;
1da177e4 LT	320
	321	extern int x25_proc_init(void);
	322	extern void x25_proc_exit(void);
	323	#endif