1 /*
2 * Declarations of AX.25 type objects.
3 *
4 * Alan Cox (GW4PTS) 10/11/93
5 */
6 #ifndef _AX25_H
7 #define _AX25_H
8
9 #include <linux/ax25.h>
10 #include <linux/spinlock.h>
11 #include <linux/timer.h>
12 #include <linux/list.h>
13 #include <linux/slab.h>
14 #include <asm/atomic.h>
15
16 #define AX25_T1CLAMPLO 1
17 #define AX25_T1CLAMPHI (30 * HZ)
18
19 #define AX25_BPQ_HEADER_LEN 16
20 #define AX25_KISS_HEADER_LEN 1
21
22 #define AX25_HEADER_LEN 17
23 #define AX25_ADDR_LEN 7
24 #define AX25_DIGI_HEADER_LEN (AX25_MAX_DIGIS * AX25_ADDR_LEN)
25 #define AX25_MAX_HEADER_LEN (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
26
27 /* AX.25 Protocol IDs */
28 #define AX25_P_ROSE 0x01
29 #define AX25_P_VJCOMP 0x06 /* Compressed TCP/IP packet */
30 /* Van Jacobsen (RFC 1144) */
31 #define AX25_P_VJUNCOMP 0x07 /* Uncompressed TCP/IP packet */
32 /* Van Jacobsen (RFC 1144) */
33 #define AX25_P_SEGMENT 0x08 /* Segmentation fragment */
34 #define AX25_P_TEXNET 0xc3 /* TEXTNET datagram protocol */
35 #define AX25_P_LQ 0xc4 /* Link Quality Protocol */
36 #define AX25_P_ATALK 0xca /* Appletalk */
37 #define AX25_P_ATALK_ARP 0xcb /* Appletalk ARP */
38 #define AX25_P_IP 0xcc /* ARPA Internet Protocol */
39 #define AX25_P_ARP 0xcd /* ARPA Address Resolution */
40 #define AX25_P_FLEXNET 0xce /* FlexNet */
41 #define AX25_P_NETROM 0xcf /* NET/ROM */
42 #define AX25_P_TEXT 0xF0 /* No layer 3 protocol impl. */
43
44 /* AX.25 Segment control values */
45 #define AX25_SEG_REM 0x7F
46 #define AX25_SEG_FIRST 0x80
47
48 #define AX25_CBIT 0x80 /* Command/Response bit */
49 #define AX25_EBIT 0x01 /* HDLC Address Extension bit */
50 #define AX25_HBIT 0x80 /* Has been repeated bit */
51
52 #define AX25_SSSID_SPARE 0x60 /* Unused bits in SSID for standard AX.25 */
53 #define AX25_ESSID_SPARE 0x20 /* Unused bits in SSID for extended AX.25 */
54 #define AX25_DAMA_FLAG 0x20 /* Well, it is *NOT* unused! (dl1bke 951121 */
55
56 #define AX25_COND_ACK_PENDING 0x01
57 #define AX25_COND_REJECT 0x02
58 #define AX25_COND_PEER_RX_BUSY 0x04
59 #define AX25_COND_OWN_RX_BUSY 0x08
60 #define AX25_COND_DAMA_MODE 0x10
61
62 #ifndef _LINUX_NETDEVICE_H
63 #include <linux/netdevice.h>
64 #endif
65
66 /* Upper sub-layer (LAPB) definitions */
67
68 /* Control field templates */
69 #define AX25_I 0x00 /* Information frames */
70 #define AX25_S 0x01 /* Supervisory frames */
71 #define AX25_RR 0x01 /* Receiver ready */
72 #define AX25_RNR 0x05 /* Receiver not ready */
73 #define AX25_REJ 0x09 /* Reject */
74 #define AX25_U 0x03 /* Unnumbered frames */
75 #define AX25_SABM 0x2f /* Set Asynchronous Balanced Mode */
76 #define AX25_SABME 0x6f /* Set Asynchronous Balanced Mode Extended */
77 #define AX25_DISC 0x43 /* Disconnect */
78 #define AX25_DM 0x0f /* Disconnected mode */
79 #define AX25_UA 0x63 /* Unnumbered acknowledge */
80 #define AX25_FRMR 0x87 /* Frame reject */
81 #define AX25_UI 0x03 /* Unnumbered information */
82 #define AX25_XID 0xaf /* Exchange information */
83 #define AX25_TEST 0xe3 /* Test */
84
85 #define AX25_PF 0x10 /* Poll/final bit for standard AX.25 */
86 #define AX25_EPF 0x01 /* Poll/final bit for extended AX.25 */
87
88 #define AX25_ILLEGAL 0x100 /* Impossible to be a real frame type */
89
90 #define AX25_POLLOFF 0
91 #define AX25_POLLON 1
92
93 /* AX25 L2 C-bit */
94 #define AX25_COMMAND 1
95 #define AX25_RESPONSE 2
96
97 /* Define Link State constants. */
98
99 enum {
100 AX25_STATE_0, /* Listening */
101 AX25_STATE_1, /* SABM sent */
102 AX25_STATE_2, /* DISC sent */
103 AX25_STATE_3, /* Established */
104 AX25_STATE_4 /* Recovery */
105 };
106
107 #define AX25_MODULUS 8 /* Standard AX.25 modulus */
108 #define AX25_EMODULUS 128 /* Extended AX.25 modulus */
109
110 enum {
111 AX25_PROTO_STD_SIMPLEX,
112 AX25_PROTO_STD_DUPLEX,
113 #ifdef CONFIG_AX25_DAMA_SLAVE
114 AX25_PROTO_DAMA_SLAVE,
115 #ifdef CONFIG_AX25_DAMA_MASTER
116 AX25_PROTO_DAMA_MASTER,
117 #define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
118 #endif
119 #endif
120 __AX25_PROTO_MAX,
121 AX25_PROTO_MAX = __AX25_PROTO_MAX -1
122 };
123
124 enum {
125 AX25_VALUES_IPDEFMODE, /* 0=DG 1=VC */
126 AX25_VALUES_AXDEFMODE, /* 0=Normal 1=Extended Seq Nos */
127 AX25_VALUES_BACKOFF, /* 0=None 1=Linear 2=Exponential */
128 AX25_VALUES_CONMODE, /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
129 AX25_VALUES_WINDOW, /* Default window size for standard AX.25 */
130 AX25_VALUES_EWINDOW, /* Default window size for extended AX.25 */
131 AX25_VALUES_T1, /* Default T1 timeout value */
132 AX25_VALUES_T2, /* Default T2 timeout value */
133 AX25_VALUES_T3, /* Default T3 timeout value */
134 AX25_VALUES_IDLE, /* Connected mode idle timer */
135 AX25_VALUES_N2, /* Default N2 value */
136 AX25_VALUES_PACLEN, /* AX.25 MTU */
137 AX25_VALUES_PROTOCOL, /* Std AX.25, DAMA Slave, DAMA Master */
138 AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
139 AX25_MAX_VALUES /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
140 };
141
142 #define AX25_DEF_IPDEFMODE 0 /* Datagram */
143 #define AX25_DEF_AXDEFMODE 0 /* Normal */
144 #define AX25_DEF_BACKOFF 1 /* Linear backoff */
145 #define AX25_DEF_CONMODE 2 /* Connected mode allowed */
146 #define AX25_DEF_WINDOW 2 /* Window=2 */
147 #define AX25_DEF_EWINDOW 32 /* Module-128 Window=32 */
148 #define AX25_DEF_T1 10000 /* T1=10s */
149 #define AX25_DEF_T2 3000 /* T2=3s */
150 #define AX25_DEF_T3 300000 /* T3=300s */
151 #define AX25_DEF_N2 10 /* N2=10 */
152 #define AX25_DEF_IDLE 0 /* Idle=None */
153 #define AX25_DEF_PACLEN 256 /* Paclen=256 */
154 #define AX25_DEF_PROTOCOL AX25_PROTO_STD_SIMPLEX /* Standard AX.25 */
155 #define AX25_DEF_DS_TIMEOUT 180000 /* DAMA timeout 3 minutes */
156
157 typedef struct ax25_uid_assoc {
158 struct hlist_node uid_node;
159 atomic_t refcount;
160 uid_t uid;
161 ax25_address call;
162 } ax25_uid_assoc;
163
164 #define ax25_uid_for_each(__ax25, node, list) \
165 hlist_for_each_entry(__ax25, node, list, uid_node)
166
167 #define ax25_uid_hold(ax25) \
168 atomic_inc(&((ax25)->refcount))
169
ax25_uid_put(ax25_uid_assoc * assoc)170 static inline void ax25_uid_put(ax25_uid_assoc *assoc)
171 {
172 if (atomic_dec_and_test(&assoc->refcount)) {
173 kfree(assoc);
174 }
175 }
176
177 typedef struct {
178 ax25_address calls[AX25_MAX_DIGIS];
179 unsigned char repeated[AX25_MAX_DIGIS];
180 unsigned char ndigi;
181 signed char lastrepeat;
182 } ax25_digi;
183
184 typedef struct ax25_route {
185 struct ax25_route *next;
186 atomic_t refcount;
187 ax25_address callsign;
188 struct net_device *dev;
189 ax25_digi *digipeat;
190 char ip_mode;
191 } ax25_route;
192
ax25_hold_route(ax25_route * ax25_rt)193 static inline void ax25_hold_route(ax25_route *ax25_rt)
194 {
195 atomic_inc(&ax25_rt->refcount);
196 }
197
198 extern void __ax25_put_route(ax25_route *ax25_rt);
199
ax25_put_route(ax25_route * ax25_rt)200 static inline void ax25_put_route(ax25_route *ax25_rt)
201 {
202 if (atomic_dec_and_test(&ax25_rt->refcount))
203 __ax25_put_route(ax25_rt);
204 }
205
206 typedef struct {
207 char slave; /* slave_mode? */
208 struct timer_list slave_timer; /* timeout timer */
209 unsigned short slave_timeout; /* when? */
210 } ax25_dama_info;
211
212 struct ctl_table;
213
214 typedef struct ax25_dev {
215 struct ax25_dev *next;
216 struct net_device *dev;
217 struct net_device *forward;
218 struct ctl_table *systable;
219 int values[AX25_MAX_VALUES];
220 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
221 ax25_dama_info dama;
222 #endif
223 } ax25_dev;
224
225 typedef struct ax25_cb {
226 struct hlist_node ax25_node;
227 ax25_address source_addr, dest_addr;
228 ax25_digi *digipeat;
229 ax25_dev *ax25_dev;
230 unsigned char iamdigi;
231 unsigned char state, modulus, pidincl;
232 unsigned short vs, vr, va;
233 unsigned char condition, backoff;
234 unsigned char n2, n2count;
235 struct timer_list t1timer, t2timer, t3timer, idletimer;
236 unsigned long t1, t2, t3, idle, rtt;
237 unsigned short paclen, fragno, fraglen;
238 struct sk_buff_head write_queue;
239 struct sk_buff_head reseq_queue;
240 struct sk_buff_head ack_queue;
241 struct sk_buff_head frag_queue;
242 unsigned char window;
243 struct timer_list timer, dtimer;
244 struct sock *sk; /* Backlink to socket */
245 atomic_t refcount;
246 } ax25_cb;
247
248 #define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
249
250 #define ax25_for_each(__ax25, node, list) \
251 hlist_for_each_entry(__ax25, node, list, ax25_node)
252
253 #define ax25_cb_hold(__ax25) \
254 atomic_inc(&((__ax25)->refcount))
255
ax25_cb_put(ax25_cb * ax25)256 static __inline__ void ax25_cb_put(ax25_cb *ax25)
257 {
258 if (atomic_dec_and_test(&ax25->refcount)) {
259 kfree(ax25->digipeat);
260 kfree(ax25);
261 }
262 }
263
ax25_type_trans(struct sk_buff * skb,struct net_device * dev)264 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
265 {
266 skb->dev = dev;
267 skb_reset_mac_header(skb);
268 skb->pkt_type = PACKET_HOST;
269 return htons(ETH_P_AX25);
270 }
271
272 /* af_ax25.c */
273 extern struct hlist_head ax25_list;
274 extern spinlock_t ax25_list_lock;
275 extern void ax25_cb_add(ax25_cb *);
276 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
277 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
278 extern ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
279 extern void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
280 extern void ax25_destroy_socket(ax25_cb *);
281 extern ax25_cb * __must_check ax25_create_cb(void);
282 extern void ax25_fillin_cb(ax25_cb *, ax25_dev *);
283 extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
284
285 /* ax25_addr.c */
286 extern const ax25_address ax25_bcast;
287 extern const ax25_address ax25_defaddr;
288 extern const ax25_address null_ax25_address;
289 extern char *ax2asc(char *buf, const ax25_address *);
290 extern void asc2ax(ax25_address *addr, const char *callsign);
291 extern int ax25cmp(const ax25_address *, const ax25_address *);
292 extern int ax25digicmp(const ax25_digi *, const ax25_digi *);
293 extern const unsigned char *ax25_addr_parse(const unsigned char *, int,
294 ax25_address *, ax25_address *, ax25_digi *, int *, int *);
295 extern int ax25_addr_build(unsigned char *, const ax25_address *,
296 const ax25_address *, const ax25_digi *, int, int);
297 extern int ax25_addr_size(const ax25_digi *);
298 extern void ax25_digi_invert(const ax25_digi *, ax25_digi *);
299
300 /* ax25_dev.c */
301 extern ax25_dev *ax25_dev_list;
302 extern spinlock_t ax25_dev_lock;
303
ax25_dev_ax25dev(struct net_device * dev)304 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
305 {
306 return dev->ax25_ptr;
307 }
308
309 extern ax25_dev *ax25_addr_ax25dev(ax25_address *);
310 extern void ax25_dev_device_up(struct net_device *);
311 extern void ax25_dev_device_down(struct net_device *);
312 extern int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
313 extern struct net_device *ax25_fwd_dev(struct net_device *);
314 extern void ax25_dev_free(void);
315
316 /* ax25_ds_in.c */
317 extern int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
318
319 /* ax25_ds_subr.c */
320 extern void ax25_ds_nr_error_recovery(ax25_cb *);
321 extern void ax25_ds_enquiry_response(ax25_cb *);
322 extern void ax25_ds_establish_data_link(ax25_cb *);
323 extern void ax25_dev_dama_off(ax25_dev *);
324 extern void ax25_dama_on(ax25_cb *);
325 extern void ax25_dama_off(ax25_cb *);
326
327 /* ax25_ds_timer.c */
328 extern void ax25_ds_setup_timer(ax25_dev *);
329 extern void ax25_ds_set_timer(ax25_dev *);
330 extern void ax25_ds_del_timer(ax25_dev *);
331 extern void ax25_ds_timer(ax25_cb *);
332 extern void ax25_ds_t1_timeout(ax25_cb *);
333 extern void ax25_ds_heartbeat_expiry(ax25_cb *);
334 extern void ax25_ds_t3timer_expiry(ax25_cb *);
335 extern void ax25_ds_idletimer_expiry(ax25_cb *);
336
337 /* ax25_iface.c */
338
339 struct ax25_protocol {
340 struct ax25_protocol *next;
341 unsigned int pid;
342 int (*func)(struct sk_buff *, ax25_cb *);
343 };
344
345 extern void ax25_register_pid(struct ax25_protocol *ap);
346 extern void ax25_protocol_release(unsigned int);
347
348 struct ax25_linkfail {
349 struct hlist_node lf_node;
350 void (*func)(ax25_cb *, int);
351 };
352
353 extern void ax25_linkfail_register(struct ax25_linkfail *lf);
354 extern void ax25_linkfail_release(struct ax25_linkfail *lf);
355 extern int __must_check ax25_listen_register(ax25_address *,
356 struct net_device *);
357 extern void ax25_listen_release(ax25_address *, struct net_device *);
358 extern int (*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
359 extern int ax25_listen_mine(ax25_address *, struct net_device *);
360 extern void ax25_link_failed(ax25_cb *, int);
361 extern int ax25_protocol_is_registered(unsigned int);
362
363 /* ax25_in.c */
364 extern int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
365 extern int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
366
367 /* ax25_ip.c */
368 extern int ax25_hard_header(struct sk_buff *, struct net_device *,
369 unsigned short, const void *,
370 const void *, unsigned int);
371 extern int ax25_rebuild_header(struct sk_buff *);
372 extern const struct header_ops ax25_header_ops;
373
374 /* ax25_out.c */
375 extern ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *, ax25_digi *, struct net_device *);
376 extern void ax25_output(ax25_cb *, int, struct sk_buff *);
377 extern void ax25_kick(ax25_cb *);
378 extern void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
379 extern void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
380 extern int ax25_check_iframes_acked(ax25_cb *, unsigned short);
381
382 /* ax25_route.c */
383 extern void ax25_rt_device_down(struct net_device *);
384 extern int ax25_rt_ioctl(unsigned int, void __user *);
385 extern const struct file_operations ax25_route_fops;
386 extern ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
387 extern int ax25_rt_autobind(ax25_cb *, ax25_address *);
388 extern struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *, ax25_address *, ax25_digi *);
389 extern void ax25_rt_free(void);
390
391 /* ax25_std_in.c */
392 extern int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
393
394 /* ax25_std_subr.c */
395 extern void ax25_std_nr_error_recovery(ax25_cb *);
396 extern void ax25_std_establish_data_link(ax25_cb *);
397 extern void ax25_std_transmit_enquiry(ax25_cb *);
398 extern void ax25_std_enquiry_response(ax25_cb *);
399 extern void ax25_std_timeout_response(ax25_cb *);
400
401 /* ax25_std_timer.c */
402 extern void ax25_std_heartbeat_expiry(ax25_cb *);
403 extern void ax25_std_t1timer_expiry(ax25_cb *);
404 extern void ax25_std_t2timer_expiry(ax25_cb *);
405 extern void ax25_std_t3timer_expiry(ax25_cb *);
406 extern void ax25_std_idletimer_expiry(ax25_cb *);
407
408 /* ax25_subr.c */
409 extern void ax25_clear_queues(ax25_cb *);
410 extern void ax25_frames_acked(ax25_cb *, unsigned short);
411 extern void ax25_requeue_frames(ax25_cb *);
412 extern int ax25_validate_nr(ax25_cb *, unsigned short);
413 extern int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
414 extern void ax25_send_control(ax25_cb *, int, int, int);
415 extern void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *, ax25_digi *);
416 extern void ax25_calculate_t1(ax25_cb *);
417 extern void ax25_calculate_rtt(ax25_cb *);
418 extern void ax25_disconnect(ax25_cb *, int);
419
420 /* ax25_timer.c */
421 extern void ax25_setup_timers(ax25_cb *);
422 extern void ax25_start_heartbeat(ax25_cb *);
423 extern void ax25_start_t1timer(ax25_cb *);
424 extern void ax25_start_t2timer(ax25_cb *);
425 extern void ax25_start_t3timer(ax25_cb *);
426 extern void ax25_start_idletimer(ax25_cb *);
427 extern void ax25_stop_heartbeat(ax25_cb *);
428 extern void ax25_stop_t1timer(ax25_cb *);
429 extern void ax25_stop_t2timer(ax25_cb *);
430 extern void ax25_stop_t3timer(ax25_cb *);
431 extern void ax25_stop_idletimer(ax25_cb *);
432 extern int ax25_t1timer_running(ax25_cb *);
433 extern unsigned long ax25_display_timer(struct timer_list *);
434
435 /* ax25_uid.c */
436 extern int ax25_uid_policy;
437 extern ax25_uid_assoc *ax25_findbyuid(uid_t);
438 extern int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
439 extern const struct file_operations ax25_uid_fops;
440 extern void ax25_uid_free(void);
441
442 /* sysctl_net_ax25.c */
443 #ifdef CONFIG_SYSCTL
444 extern void ax25_register_sysctl(void);
445 extern void ax25_unregister_sysctl(void);
446 #else
ax25_register_sysctl(void)447 static inline void ax25_register_sysctl(void) {};
ax25_unregister_sysctl(void)448 static inline void ax25_unregister_sysctl(void) {};
449 #endif /* CONFIG_SYSCTL */
450
451 #endif
452