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Linux/include/net/ax25.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *      Declarations of AX.25 type objects.
  4  *
  5  *      Alan Cox (GW4PTS)       10/11/93
  6  */
  7 #ifndef _AX25_H
  8 #define _AX25_H 
  9 
 10 #include <linux/ax25.h>
 11 #include <linux/spinlock.h>
 12 #include <linux/timer.h>
 13 #include <linux/list.h>
 14 #include <linux/slab.h>
 15 #include <linux/refcount.h>
 16 #include <net/neighbour.h>
 17 #include <net/sock.h>
 18 #include <linux/seq_file.h>
 19 
 20 #define AX25_T1CLAMPLO                  1
 21 #define AX25_T1CLAMPHI                  (30 * HZ)
 22 
 23 #define AX25_BPQ_HEADER_LEN             16
 24 #define AX25_KISS_HEADER_LEN            1
 25 
 26 #define AX25_HEADER_LEN                 17
 27 #define AX25_ADDR_LEN                   7
 28 #define AX25_DIGI_HEADER_LEN            (AX25_MAX_DIGIS * AX25_ADDR_LEN)
 29 #define AX25_MAX_HEADER_LEN             (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
 30 
 31 /* AX.25 Protocol IDs */
 32 #define AX25_P_ROSE                     0x01
 33 #define AX25_P_VJCOMP                   0x06    /* Compressed TCP/IP packet   */
 34                                                 /* Van Jacobsen (RFC 1144)    */
 35 #define AX25_P_VJUNCOMP                 0x07    /* Uncompressed TCP/IP packet */
 36                                                 /* Van Jacobsen (RFC 1144)    */
 37 #define AX25_P_SEGMENT                  0x08    /* Segmentation fragment      */
 38 #define AX25_P_TEXNET                   0xc3    /* TEXTNET datagram protocol  */
 39 #define AX25_P_LQ                       0xc4    /* Link Quality Protocol      */
 40 #define AX25_P_ATALK                    0xca    /* Appletalk                  */
 41 #define AX25_P_ATALK_ARP                0xcb    /* Appletalk ARP              */
 42 #define AX25_P_IP                       0xcc    /* ARPA Internet Protocol     */
 43 #define AX25_P_ARP                      0xcd    /* ARPA Address Resolution    */
 44 #define AX25_P_FLEXNET                  0xce    /* FlexNet                    */
 45 #define AX25_P_NETROM                   0xcf    /* NET/ROM                    */
 46 #define AX25_P_TEXT                     0xF0    /* No layer 3 protocol impl.  */
 47 
 48 /* AX.25 Segment control values */
 49 #define AX25_SEG_REM                    0x7F
 50 #define AX25_SEG_FIRST                  0x80
 51 
 52 #define AX25_CBIT                       0x80    /* Command/Response bit */
 53 #define AX25_EBIT                       0x01    /* HDLC Address Extension bit */
 54 #define AX25_HBIT                       0x80    /* Has been repeated bit */
 55 
 56 #define AX25_SSSID_SPARE                0x60    /* Unused bits in SSID for standard AX.25 */
 57 #define AX25_ESSID_SPARE                0x20    /* Unused bits in SSID for extended AX.25 */
 58 #define AX25_DAMA_FLAG                  0x20    /* Well, it is *NOT* unused! (dl1bke 951121 */
 59 
 60 #define AX25_COND_ACK_PENDING           0x01
 61 #define AX25_COND_REJECT                0x02
 62 #define AX25_COND_PEER_RX_BUSY          0x04
 63 #define AX25_COND_OWN_RX_BUSY           0x08
 64 #define AX25_COND_DAMA_MODE             0x10
 65 
 66 #ifndef _LINUX_NETDEVICE_H
 67 #include <linux/netdevice.h>
 68 #endif
 69 
 70 /* Upper sub-layer (LAPB) definitions */
 71 
 72 /* Control field templates */
 73 #define AX25_I                  0x00    /* Information frames */
 74 #define AX25_S                  0x01    /* Supervisory frames */
 75 #define AX25_RR                 0x01    /* Receiver ready */
 76 #define AX25_RNR                0x05    /* Receiver not ready */
 77 #define AX25_REJ                0x09    /* Reject */
 78 #define AX25_U                  0x03    /* Unnumbered frames */
 79 #define AX25_SABM               0x2f    /* Set Asynchronous Balanced Mode */
 80 #define AX25_SABME              0x6f    /* Set Asynchronous Balanced Mode Extended */
 81 #define AX25_DISC               0x43    /* Disconnect */
 82 #define AX25_DM                 0x0f    /* Disconnected mode */
 83 #define AX25_UA                 0x63    /* Unnumbered acknowledge */
 84 #define AX25_FRMR               0x87    /* Frame reject */
 85 #define AX25_UI                 0x03    /* Unnumbered information */
 86 #define AX25_XID                0xaf    /* Exchange information */
 87 #define AX25_TEST               0xe3    /* Test */
 88 
 89 #define AX25_PF                 0x10    /* Poll/final bit for standard AX.25 */
 90 #define AX25_EPF                0x01    /* Poll/final bit for extended AX.25 */
 91 
 92 #define AX25_ILLEGAL            0x100   /* Impossible to be a real frame type */
 93 
 94 #define AX25_POLLOFF            0
 95 #define AX25_POLLON             1
 96 
 97 /* AX25 L2 C-bit */
 98 #define AX25_COMMAND            1
 99 #define AX25_RESPONSE           2
100 
101 /* Define Link State constants. */
102 
103 enum { 
104         AX25_STATE_0,                   /* Listening */
105         AX25_STATE_1,                   /* SABM sent */
106         AX25_STATE_2,                   /* DISC sent */
107         AX25_STATE_3,                   /* Established */
108         AX25_STATE_4                    /* Recovery */
109 };
110 
111 #define AX25_MODULUS            8       /*  Standard AX.25 modulus */
112 #define AX25_EMODULUS           128     /*  Extended AX.25 modulus */
113 
114 enum {
115         AX25_PROTO_STD_SIMPLEX,
116         AX25_PROTO_STD_DUPLEX,
117 #ifdef CONFIG_AX25_DAMA_SLAVE
118         AX25_PROTO_DAMA_SLAVE,
119 #ifdef CONFIG_AX25_DAMA_MASTER
120         AX25_PROTO_DAMA_MASTER,
121 #define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
122 #endif
123 #endif
124         __AX25_PROTO_MAX,
125         AX25_PROTO_MAX = __AX25_PROTO_MAX -1
126 };
127 
128 enum {
129         AX25_VALUES_IPDEFMODE,  /* 0=DG 1=VC */
130         AX25_VALUES_AXDEFMODE,  /* 0=Normal 1=Extended Seq Nos */
131         AX25_VALUES_BACKOFF,    /* 0=None 1=Linear 2=Exponential */
132         AX25_VALUES_CONMODE,    /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
133         AX25_VALUES_WINDOW,     /* Default window size for standard AX.25 */
134         AX25_VALUES_EWINDOW,    /* Default window size for extended AX.25 */
135         AX25_VALUES_T1,         /* Default T1 timeout value */
136         AX25_VALUES_T2,         /* Default T2 timeout value */
137         AX25_VALUES_T3,         /* Default T3 timeout value */
138         AX25_VALUES_IDLE,       /* Connected mode idle timer */
139         AX25_VALUES_N2,         /* Default N2 value */
140         AX25_VALUES_PACLEN,     /* AX.25 MTU */
141         AX25_VALUES_PROTOCOL,   /* Std AX.25, DAMA Slave, DAMA Master */
142         AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
143         AX25_MAX_VALUES         /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
144 };
145 
146 #define AX25_DEF_IPDEFMODE      0                       /* Datagram */
147 #define AX25_DEF_AXDEFMODE      0                       /* Normal */
148 #define AX25_DEF_BACKOFF        1                       /* Linear backoff */
149 #define AX25_DEF_CONMODE        2                       /* Connected mode allowed */
150 #define AX25_DEF_WINDOW         2                       /* Window=2 */
151 #define AX25_DEF_EWINDOW        32                      /* Module-128 Window=32 */
152 #define AX25_DEF_T1             10000                   /* T1=10s */
153 #define AX25_DEF_T2             3000                    /* T2=3s  */
154 #define AX25_DEF_T3             300000                  /* T3=300s */
155 #define AX25_DEF_N2             10                      /* N2=10 */
156 #define AX25_DEF_IDLE           0                       /* Idle=None */
157 #define AX25_DEF_PACLEN         256                     /* Paclen=256 */
158 #define AX25_DEF_PROTOCOL       AX25_PROTO_STD_SIMPLEX  /* Standard AX.25 */
159 #define AX25_DEF_DS_TIMEOUT     180000                  /* DAMA timeout 3 minutes */
160 
161 typedef struct ax25_uid_assoc {
162         struct hlist_node       uid_node;
163         refcount_t              refcount;
164         kuid_t                  uid;
165         ax25_address            call;
166 } ax25_uid_assoc;
167 
168 #define ax25_uid_for_each(__ax25, list) \
169         hlist_for_each_entry(__ax25, list, uid_node)
170 
171 #define ax25_uid_hold(ax25) \
172         refcount_inc(&((ax25)->refcount))
173 
174 static inline void ax25_uid_put(ax25_uid_assoc *assoc)
175 {
176         if (refcount_dec_and_test(&assoc->refcount)) {
177                 kfree(assoc);
178         }
179 }
180 
181 typedef struct {
182         ax25_address            calls[AX25_MAX_DIGIS];
183         unsigned char           repeated[AX25_MAX_DIGIS];
184         unsigned char           ndigi;
185         signed char             lastrepeat;
186 } ax25_digi;
187 
188 typedef struct ax25_route {
189         struct ax25_route       *next;
190         refcount_t              refcount;
191         ax25_address            callsign;
192         struct net_device       *dev;
193         ax25_digi               *digipeat;
194         char                    ip_mode;
195 } ax25_route;
196 
197 static inline void ax25_hold_route(ax25_route *ax25_rt)
198 {
199         refcount_inc(&ax25_rt->refcount);
200 }
201 
202 void __ax25_put_route(ax25_route *ax25_rt);
203 
204 static inline void ax25_put_route(ax25_route *ax25_rt)
205 {
206         if (refcount_dec_and_test(&ax25_rt->refcount))
207                 __ax25_put_route(ax25_rt);
208 }
209 
210 typedef struct {
211         char                    slave;                  /* slave_mode?   */
212         struct timer_list       slave_timer;            /* timeout timer */
213         unsigned short          slave_timeout;          /* when? */
214 } ax25_dama_info;
215 
216 struct ctl_table;
217 
218 typedef struct ax25_dev {
219         struct ax25_dev         *next;
220         struct net_device       *dev;
221         struct net_device       *forward;
222         struct ctl_table_header *sysheader;
223         int                     values[AX25_MAX_VALUES];
224 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
225         ax25_dama_info          dama;
226 #endif
227 } ax25_dev;
228 
229 typedef struct ax25_cb {
230         struct hlist_node       ax25_node;
231         ax25_address            source_addr, dest_addr;
232         ax25_digi               *digipeat;
233         ax25_dev                *ax25_dev;
234         unsigned char           iamdigi;
235         unsigned char           state, modulus, pidincl;
236         unsigned short          vs, vr, va;
237         unsigned char           condition, backoff;
238         unsigned char           n2, n2count;
239         struct timer_list       t1timer, t2timer, t3timer, idletimer;
240         unsigned long           t1, t2, t3, idle, rtt;
241         unsigned short          paclen, fragno, fraglen;
242         struct sk_buff_head     write_queue;
243         struct sk_buff_head     reseq_queue;
244         struct sk_buff_head     ack_queue;
245         struct sk_buff_head     frag_queue;
246         unsigned char           window;
247         struct timer_list       timer, dtimer;
248         struct sock             *sk;            /* Backlink to socket */
249         refcount_t              refcount;
250 } ax25_cb;
251 
252 struct ax25_sock {
253         struct sock             sk;
254         struct ax25_cb          *cb;
255 };
256 
257 static inline struct ax25_sock *ax25_sk(const struct sock *sk)
258 {
259         return (struct ax25_sock *) sk;
260 }
261 
262 static inline struct ax25_cb *sk_to_ax25(const struct sock *sk)
263 {
264         return ax25_sk(sk)->cb;
265 }
266 
267 #define ax25_for_each(__ax25, list) \
268         hlist_for_each_entry(__ax25, list, ax25_node)
269 
270 #define ax25_cb_hold(__ax25) \
271         refcount_inc(&((__ax25)->refcount))
272 
273 static __inline__ void ax25_cb_put(ax25_cb *ax25)
274 {
275         if (refcount_dec_and_test(&ax25->refcount)) {
276                 kfree(ax25->digipeat);
277                 kfree(ax25);
278         }
279 }
280 
281 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
282 {
283         skb->dev      = dev;
284         skb_reset_mac_header(skb);
285         skb->pkt_type = PACKET_HOST;
286         return htons(ETH_P_AX25);
287 }
288 
289 /* af_ax25.c */
290 extern struct hlist_head ax25_list;
291 extern spinlock_t ax25_list_lock;
292 void ax25_cb_add(ax25_cb *);
293 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
294 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
295 ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *,
296                       struct net_device *);
297 void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
298 void ax25_destroy_socket(ax25_cb *);
299 ax25_cb * __must_check ax25_create_cb(void);
300 void ax25_fillin_cb(ax25_cb *, ax25_dev *);
301 struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
302 
303 /* ax25_addr.c */
304 extern const ax25_address ax25_bcast;
305 extern const ax25_address ax25_defaddr;
306 extern const ax25_address null_ax25_address;
307 char *ax2asc(char *buf, const ax25_address *);
308 void asc2ax(ax25_address *addr, const char *callsign);
309 int ax25cmp(const ax25_address *, const ax25_address *);
310 int ax25digicmp(const ax25_digi *, const ax25_digi *);
311 const unsigned char *ax25_addr_parse(const unsigned char *, int,
312         ax25_address *, ax25_address *, ax25_digi *, int *, int *);
313 int ax25_addr_build(unsigned char *, const ax25_address *,
314                     const ax25_address *, const ax25_digi *, int, int);
315 int ax25_addr_size(const ax25_digi *);
316 void ax25_digi_invert(const ax25_digi *, ax25_digi *);
317 
318 /* ax25_dev.c */
319 extern ax25_dev *ax25_dev_list;
320 extern spinlock_t ax25_dev_lock;
321 
322 #if IS_ENABLED(CONFIG_AX25)
323 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
324 {
325         return dev->ax25_ptr;
326 }
327 #endif
328 
329 ax25_dev *ax25_addr_ax25dev(ax25_address *);
330 void ax25_dev_device_up(struct net_device *);
331 void ax25_dev_device_down(struct net_device *);
332 int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
333 struct net_device *ax25_fwd_dev(struct net_device *);
334 void ax25_dev_free(void);
335 
336 /* ax25_ds_in.c */
337 int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
338 
339 /* ax25_ds_subr.c */
340 void ax25_ds_nr_error_recovery(ax25_cb *);
341 void ax25_ds_enquiry_response(ax25_cb *);
342 void ax25_ds_establish_data_link(ax25_cb *);
343 void ax25_dev_dama_off(ax25_dev *);
344 void ax25_dama_on(ax25_cb *);
345 void ax25_dama_off(ax25_cb *);
346 
347 /* ax25_ds_timer.c */
348 void ax25_ds_setup_timer(ax25_dev *);
349 void ax25_ds_set_timer(ax25_dev *);
350 void ax25_ds_del_timer(ax25_dev *);
351 void ax25_ds_timer(ax25_cb *);
352 void ax25_ds_t1_timeout(ax25_cb *);
353 void ax25_ds_heartbeat_expiry(ax25_cb *);
354 void ax25_ds_t3timer_expiry(ax25_cb *);
355 void ax25_ds_idletimer_expiry(ax25_cb *);
356 
357 /* ax25_iface.c */
358 
359 struct ax25_protocol {
360         struct ax25_protocol *next;
361         unsigned int pid;
362         int (*func)(struct sk_buff *, ax25_cb *);
363 };
364 
365 void ax25_register_pid(struct ax25_protocol *ap);
366 void ax25_protocol_release(unsigned int);
367 
368 struct ax25_linkfail {
369         struct hlist_node lf_node;
370         void (*func)(ax25_cb *, int);
371 };
372 
373 void ax25_linkfail_register(struct ax25_linkfail *lf);
374 void ax25_linkfail_release(struct ax25_linkfail *lf);
375 int __must_check ax25_listen_register(ax25_address *, struct net_device *);
376 void ax25_listen_release(ax25_address *, struct net_device *);
377 int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
378 int ax25_listen_mine(ax25_address *, struct net_device *);
379 void ax25_link_failed(ax25_cb *, int);
380 int ax25_protocol_is_registered(unsigned int);
381 
382 /* ax25_in.c */
383 int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
384 int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *,
385                   struct net_device *);
386 
387 /* ax25_ip.c */
388 netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
389 extern const struct header_ops ax25_header_ops;
390 
391 /* ax25_out.c */
392 ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *,
393                          ax25_digi *, struct net_device *);
394 void ax25_output(ax25_cb *, int, struct sk_buff *);
395 void ax25_kick(ax25_cb *);
396 void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
397 void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
398 int ax25_check_iframes_acked(ax25_cb *, unsigned short);
399 
400 /* ax25_route.c */
401 void ax25_rt_device_down(struct net_device *);
402 int ax25_rt_ioctl(unsigned int, void __user *);
403 extern const struct seq_operations ax25_rt_seqops;
404 ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
405 int ax25_rt_autobind(ax25_cb *, ax25_address *);
406 struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *,
407                                    ax25_address *, ax25_digi *);
408 void ax25_rt_free(void);
409 
410 /* ax25_std_in.c */
411 int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
412 
413 /* ax25_std_subr.c */
414 void ax25_std_nr_error_recovery(ax25_cb *);
415 void ax25_std_establish_data_link(ax25_cb *);
416 void ax25_std_transmit_enquiry(ax25_cb *);
417 void ax25_std_enquiry_response(ax25_cb *);
418 void ax25_std_timeout_response(ax25_cb *);
419 
420 /* ax25_std_timer.c */
421 void ax25_std_heartbeat_expiry(ax25_cb *);
422 void ax25_std_t1timer_expiry(ax25_cb *);
423 void ax25_std_t2timer_expiry(ax25_cb *);
424 void ax25_std_t3timer_expiry(ax25_cb *);
425 void ax25_std_idletimer_expiry(ax25_cb *);
426 
427 /* ax25_subr.c */
428 void ax25_clear_queues(ax25_cb *);
429 void ax25_frames_acked(ax25_cb *, unsigned short);
430 void ax25_requeue_frames(ax25_cb *);
431 int ax25_validate_nr(ax25_cb *, unsigned short);
432 int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
433 void ax25_send_control(ax25_cb *, int, int, int);
434 void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *,
435                     ax25_digi *);
436 void ax25_calculate_t1(ax25_cb *);
437 void ax25_calculate_rtt(ax25_cb *);
438 void ax25_disconnect(ax25_cb *, int);
439 
440 /* ax25_timer.c */
441 void ax25_setup_timers(ax25_cb *);
442 void ax25_start_heartbeat(ax25_cb *);
443 void ax25_start_t1timer(ax25_cb *);
444 void ax25_start_t2timer(ax25_cb *);
445 void ax25_start_t3timer(ax25_cb *);
446 void ax25_start_idletimer(ax25_cb *);
447 void ax25_stop_heartbeat(ax25_cb *);
448 void ax25_stop_t1timer(ax25_cb *);
449 void ax25_stop_t2timer(ax25_cb *);
450 void ax25_stop_t3timer(ax25_cb *);
451 void ax25_stop_idletimer(ax25_cb *);
452 int ax25_t1timer_running(ax25_cb *);
453 unsigned long ax25_display_timer(struct timer_list *);
454 
455 /* ax25_uid.c */
456 extern int  ax25_uid_policy;
457 ax25_uid_assoc *ax25_findbyuid(kuid_t);
458 int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
459 extern const struct seq_operations ax25_uid_seqops;
460 void ax25_uid_free(void);
461 
462 /* sysctl_net_ax25.c */
463 #ifdef CONFIG_SYSCTL
464 int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
465 void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
466 #else
467 static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
468 static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
469 #endif /* CONFIG_SYSCTL */
470 
471 #endif
472 

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