aboutsummaryrefslogtreecommitdiffstats
path: root/include/net/ax25.h
blob: 3696f988a9f109710f8f947880eda11283fe449d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
/*
 *	Declarations of AX.25 type objects.
 *
 *	Alan Cox (GW4PTS) 	10/11/93
 */
#ifndef _AX25_H
#define _AX25_H 

#include <linux/config.h>
#include <linux/ax25.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <asm/atomic.h>

#define	AX25_T1CLAMPLO  		1
#define	AX25_T1CLAMPHI 			(30 * HZ)

#define	AX25_BPQ_HEADER_LEN		16
#define	AX25_KISS_HEADER_LEN		1

#define	AX25_HEADER_LEN			17
#define	AX25_ADDR_LEN			7
#define	AX25_DIGI_HEADER_LEN		(AX25_MAX_DIGIS * AX25_ADDR_LEN)
#define	AX25_MAX_HEADER_LEN		(AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)

/* AX.25 Protocol IDs */
#define AX25_P_ROSE			0x01
#define AX25_P_IP			0xCC
#define AX25_P_ARP			0xCD
#define AX25_P_TEXT 			0xF0
#define AX25_P_NETROM 			0xCF
#define	AX25_P_SEGMENT			0x08

/* AX.25 Segment control values */
#define	AX25_SEG_REM			0x7F
#define	AX25_SEG_FIRST			0x80

#define AX25_CBIT			0x80	/* Command/Response bit */
#define AX25_EBIT			0x01	/* HDLC Address Extension bit */
#define AX25_HBIT			0x80	/* Has been repeated bit */

#define AX25_SSSID_SPARE		0x60	/* Unused bits in SSID for standard AX.25 */
#define AX25_ESSID_SPARE		0x20	/* Unused bits in SSID for extended AX.25 */
#define AX25_DAMA_FLAG			0x20	/* Well, it is *NOT* unused! (dl1bke 951121 */

#define	AX25_COND_ACK_PENDING		0x01
#define	AX25_COND_REJECT		0x02
#define	AX25_COND_PEER_RX_BUSY		0x04
#define	AX25_COND_OWN_RX_BUSY		0x08
#define	AX25_COND_DAMA_MODE		0x10

#ifndef _LINUX_NETDEVICE_H
#include <linux/netdevice.h>
#endif

/* Upper sub-layer (LAPB) definitions */

/* Control field templates */
#define	AX25_I			0x00	/* Information frames */
#define	AX25_S			0x01	/* Supervisory frames */
#define	AX25_RR			0x01	/* Receiver ready */
#define	AX25_RNR		0x05	/* Receiver not ready */
#define	AX25_REJ		0x09	/* Reject */
#define	AX25_U			0x03	/* Unnumbered frames */
#define	AX25_SABM		0x2f	/* Set Asynchronous Balanced Mode */
#define	AX25_SABME		0x6f	/* Set Asynchronous Balanced Mode Extended */
#define	AX25_DISC		0x43	/* Disconnect */
#define	AX25_DM			0x0f	/* Disconnected mode */
#define	AX25_UA			0x63	/* Unnumbered acknowledge */
#define	AX25_FRMR		0x87	/* Frame reject */
#define	AX25_UI			0x03	/* Unnumbered information */
#define	AX25_XID		0xaf	/* Exchange information */
#define	AX25_TEST		0xe3	/* Test */

#define	AX25_PF			0x10	/* Poll/final bit for standard AX.25 */
#define	AX25_EPF		0x01	/* Poll/final bit for extended AX.25 */

#define AX25_ILLEGAL		0x100	/* Impossible to be a real frame type */

#define	AX25_POLLOFF		0
#define	AX25_POLLON		1

/* AX25 L2 C-bit */
#define AX25_COMMAND		1
#define AX25_RESPONSE		2

/* Define Link State constants. */

enum { 
	AX25_STATE_0,
	AX25_STATE_1,
	AX25_STATE_2,
	AX25_STATE_3,
	AX25_STATE_4
};

#define AX25_MODULUS 		8	/*  Standard AX.25 modulus */
#define	AX25_EMODULUS		128	/*  Extended AX.25 modulus */

enum {
	AX25_PROTO_STD_SIMPLEX,
	AX25_PROTO_STD_DUPLEX,
	AX25_PROTO_DAMA_SLAVE,
	AX25_PROTO_DAMA_MASTER
};

enum {
	AX25_VALUES_IPDEFMODE,	/* 0=DG 1=VC */
	AX25_VALUES_AXDEFMODE,	/* 0=Normal 1=Extended Seq Nos */
	AX25_VALUES_BACKOFF,	/* 0=None 1=Linear 2=Exponential */
	AX25_VALUES_CONMODE,	/* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
	AX25_VALUES_WINDOW,	/* Default window size for standard AX.25 */
	AX25_VALUES_EWINDOW,	/* Default window size for extended AX.25 */
	AX25_VALUES_T1,		/* Default T1 timeout value */
	AX25_VALUES_T2,		/* Default T2 timeout value */
	AX25_VALUES_T3,		/* Default T3 timeout value */
	AX25_VALUES_IDLE,	/* Connected mode idle timer */
	AX25_VALUES_N2,		/* Default N2 value */
	AX25_VALUES_PACLEN,	/* AX.25 MTU */
	AX25_VALUES_PROTOCOL,	/* Std AX.25, DAMA Slave, DAMA Master */
	AX25_VALUES_DS_TIMEOUT,	/* DAMA Slave timeout */
	AX25_MAX_VALUES		/* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
};

#define	AX25_DEF_IPDEFMODE	0			/* Datagram */
#define	AX25_DEF_AXDEFMODE	0			/* Normal */
#define	AX25_DEF_BACKOFF	1			/* Linear backoff */
#define	AX25_DEF_CONMODE	2			/* Connected mode allowed */
#define	AX25_DEF_WINDOW		2			/* Window=2 */
#define	AX25_DEF_EWINDOW	32			/* Module-128 Window=32 */
#define	AX25_DEF_T1		(10 * HZ)		/* T1=10s */
#define	AX25_DEF_T2		(3 * HZ)		/* T2=3s  */
#define	AX25_DEF_T3		(300 * HZ)		/* T3=300s */
#define	AX25_DEF_N2		10			/* N2=10 */
#define AX25_DEF_IDLE		(0 * 60 * HZ)		/* Idle=None */
#define AX25_DEF_PACLEN		256			/* Paclen=256 */
#define	AX25_DEF_PROTOCOL	AX25_PROTO_STD_SIMPLEX	/* Standard AX.25 */
#define AX25_DEF_DS_TIMEOUT	(3 * 60 * HZ)		/* DAMA timeout 3 minutes */

typedef struct ax25_uid_assoc {
	struct hlist_node	uid_node;
	atomic_t		refcount;
	uid_t			uid;
	ax25_address		call;
} ax25_uid_assoc;

#define ax25_uid_for_each(__ax25, node, list) \
	hlist_for_each_entry(__ax25, node, list, uid_node)

#define ax25_uid_hold(ax25) \
	atomic_inc(&((ax25)->refcount))

static inline void ax25_uid_put(ax25_uid_assoc *assoc)
{
	if (atomic_dec_and_test(&assoc->refcount)) {
		kfree(assoc);
	}
}

typedef struct {
	ax25_address		calls[AX25_MAX_DIGIS];
	unsigned char		repeated[AX25_MAX_DIGIS];
	unsigned char		ndigi;
	char			lastrepeat;
} ax25_digi;

typedef struct ax25_route {
	struct ax25_route	*next;
	atomic_t		ref;
	ax25_address		callsign;
	struct net_device	*dev;
	ax25_digi		*digipeat;
	char			ip_mode;
	struct timer_list	timer;
} ax25_route;

typedef struct {
	char			slave;			/* slave_mode?   */
	struct timer_list	slave_timer;		/* timeout timer */
	unsigned short		slave_timeout;		/* when? */
} ax25_dama_info;

struct ctl_table;

typedef struct ax25_dev {
	struct ax25_dev		*next;
	struct net_device	*dev;
	struct net_device	*forward;
	struct ctl_table	*systable;
	int			values[AX25_MAX_VALUES];
#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
	ax25_dama_info		dama;
#endif
} ax25_dev;

typedef struct ax25_cb {
	struct hlist_node	ax25_node;
	ax25_address		source_addr, dest_addr;
	ax25_digi		*digipeat;
	ax25_dev		*ax25_dev;
	unsigned char		iamdigi;
	unsigned char		state, modulus, pidincl;
	unsigned short		vs, vr, va;
	unsigned char		condition, backoff;
	unsigned char		n2, n2count;
	struct timer_list	t1timer, t2timer, t3timer, idletimer;
	unsigned long		t1, t2, t3, idle, rtt;
	unsigned short		paclen, fragno, fraglen;
	struct sk_buff_head	write_queue;
	struct sk_buff_head	reseq_queue;
	struct sk_buff_head	ack_queue;
	struct sk_buff_head	frag_queue;
	unsigned char		window;
	struct timer_list	timer, dtimer;
	struct sock		*sk;		/* Backlink to socket */
	atomic_t		refcount;
} ax25_cb;

#define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)

#define ax25_for_each(__ax25, node, list) \
	hlist_for_each_entry(__ax25, node, list, ax25_node)

#define ax25_cb_hold(__ax25) \
	atomic_inc(&((__ax25)->refcount))

static __inline__ void ax25_cb_put(ax25_cb *ax25)
{
	if (atomic_dec_and_test(&ax25->refcount)) {
		if (ax25->digipeat)
			kfree(ax25->digipeat);
		kfree(ax25);
	}
}

static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
{
	skb->dev      = dev;
	skb->pkt_type = PACKET_HOST;
	skb->mac.raw  = skb->data;
	return htons(ETH_P_AX25);
}

/* af_ax25.c */
extern struct hlist_head ax25_list;
extern spinlock_t ax25_list_lock;
extern void ax25_cb_add(ax25_cb *);
struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
extern void ax25_destroy_socket(ax25_cb *);
extern ax25_cb *ax25_create_cb(void);
extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);

/* ax25_addr.c */
extern ax25_address null_ax25_address;
extern char *ax2asc(ax25_address *);
extern ax25_address *asc2ax(char *);
extern int  ax25cmp(ax25_address *, ax25_address *);
extern int  ax25digicmp(ax25_digi *, ax25_digi *);
extern unsigned char *ax25_addr_parse(unsigned char *, int, ax25_address *, ax25_address *, ax25_digi *, int *, int *);
extern int  ax25_addr_build(unsigned char *, ax25_address *, ax25_address *, ax25_digi *, int, int);
extern int  ax25_addr_size(ax25_digi *);
extern void ax25_digi_invert(ax25_digi *, ax25_digi *);

/* ax25_dev.c */
extern ax25_dev *ax25_dev_list;
extern spinlock_t ax25_dev_lock;

static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
{
	return dev->ax25_ptr;
}

extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
extern void ax25_dev_device_up(struct net_device *);
extern void ax25_dev_device_down(struct net_device *);
extern int  ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
extern struct net_device *ax25_fwd_dev(struct net_device *);
extern void ax25_dev_free(void);

/* ax25_ds_in.c */
extern int  ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);

/* ax25_ds_subr.c */
extern void ax25_ds_nr_error_recovery(ax25_cb *);
extern void ax25_ds_enquiry_response(ax25_cb *);
extern void ax25_ds_establish_data_link(ax25_cb *);
extern void ax25_dev_dama_off(ax25_dev *);
extern void ax25_dama_on(ax25_cb *);
extern void ax25_dama_off(ax25_cb *);

/* ax25_ds_timer.c */
extern void ax25_ds_set_timer(ax25_dev *);
extern void ax25_ds_del_timer(ax25_dev *);
extern void ax25_ds_timer(ax25_cb *);
extern void ax25_ds_t1_timeout(ax25_cb *);
extern void ax25_ds_heartbeat_expiry(ax25_cb *);
extern void ax25_ds_t3timer_expiry(ax25_cb *);
extern void ax25_ds_idletimer_expiry(ax25_cb *);

/* ax25_iface.c */
extern int  ax25_protocol_register(unsigned int, int (*)(struct sk_buff *, ax25_cb *));
extern void ax25_protocol_release(unsigned int);
extern int  ax25_linkfail_register(void (*)(ax25_cb *, int));
extern void ax25_linkfail_release(void (*)(ax25_cb *, int));
extern int  ax25_listen_register(ax25_address *, struct net_device *);
extern void ax25_listen_release(ax25_address *, struct net_device *);
extern int  (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
extern int  ax25_listen_mine(ax25_address *, struct net_device *);
extern void ax25_link_failed(ax25_cb *, int);
extern int  ax25_protocol_is_registered(unsigned int);

/* ax25_in.c */
extern int  ax25_rx_iframe(ax25_cb *, struct sk_buff *);
extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *);

/* ax25_ip.c */
extern int  ax25_encapsulate(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
extern int  ax25_rebuild_header(struct sk_buff *);

/* ax25_out.c */
extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
extern void ax25_output(ax25_cb *, int, struct sk_buff *);
extern void ax25_kick(ax25_cb *);
extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
extern int  ax25_check_iframes_acked(ax25_cb *, unsigned short);

/* ax25_route.c */
extern void ax25_rt_device_down(struct net_device *);
extern int  ax25_rt_ioctl(unsigned int, void __user *);
extern struct file_operations ax25_route_fops;
extern int  ax25_rt_autobind(ax25_cb *, ax25_address *);
extern ax25_route *ax25_rt_find_route(ax25_route *, ax25_address *,
	struct net_device *);
extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
extern void ax25_rt_free(void);

static inline void ax25_put_route(ax25_route *ax25_rt)
{
	atomic_dec(&ax25_rt->ref);
}

/* ax25_std_in.c */
extern int  ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);

/* ax25_std_subr.c */
extern void ax25_std_nr_error_recovery(ax25_cb *);
extern void ax25_std_establish_data_link(ax25_cb *);
extern void ax25_std_transmit_enquiry(ax25_cb *);
extern void ax25_std_enquiry_response(ax25_cb *);
extern void ax25_std_timeout_response(ax25_cb *);

/* ax25_std_timer.c */
extern void ax25_std_heartbeat_expiry(ax25_cb *);
extern void ax25_std_t1timer_expiry(ax25_cb *);
extern void ax25_std_t2timer_expiry(ax25_cb *);
extern void ax25_std_t3timer_expiry(ax25_cb *);
extern void ax25_std_idletimer_expiry(ax25_cb *);

/* ax25_subr.c */
extern void ax25_clear_queues(ax25_cb *);
extern void ax25_frames_acked(ax25_cb *, unsigned short);
extern void ax25_requeue_frames(ax25_cb *);
extern int  ax25_validate_nr(ax25_cb *, unsigned short);
extern int  ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
extern void ax25_send_control(ax25_cb *, int, int, int);
extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
extern void ax25_calculate_t1(ax25_cb *);
extern void ax25_calculate_rtt(ax25_cb *);
extern void ax25_disconnect(ax25_cb *, int);

/* ax25_timer.c */
extern void ax25_start_heartbeat(ax25_cb *);
extern void ax25_start_t1timer(ax25_cb *);
extern void ax25_start_t2timer(ax25_cb *);
extern void ax25_start_t3timer(ax25_cb *);
extern void ax25_start_idletimer(ax25_cb *);
extern void ax25_stop_heartbeat(ax25_cb *);
extern void ax25_stop_t1timer(ax25_cb *);
extern void ax25_stop_t2timer(ax25_cb *);
extern void ax25_stop_t3timer(ax25_cb *);
extern void ax25_stop_idletimer(ax25_cb *);
extern int  ax25_t1timer_running(ax25_cb *);
extern unsigned long ax25_display_timer(struct timer_list *);

/* ax25_uid.c */
extern int  ax25_uid_policy;
extern ax25_uid_assoc *ax25_findbyuid(uid_t);
extern int  ax25_uid_ioctl(int, struct sockaddr_ax25 *);
extern struct file_operations ax25_uid_fops;
extern void ax25_uid_free(void);

/* sysctl_net_ax25.c */
#ifdef CONFIG_SYSCTL
extern void ax25_register_sysctl(void);
extern void ax25_unregister_sysctl(void);
#else
static inline void ax25_register_sysctl(void) {};
static inline void ax25_unregister_sysctl(void) {};
#endif /* CONFIG_SYSCTL */

#endif