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Linux/include/net/ax25.h

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  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 
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 
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 
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 
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 
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 
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
447 static inline void ax25_register_sysctl(void) {};
448 static inline void ax25_unregister_sysctl(void) {};
449 #endif /* CONFIG_SYSCTL */
450 
451 #endif
452 

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