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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 
 19 #define AX25_T1CLAMPLO                  1
 20 #define AX25_T1CLAMPHI                  (30 * HZ)
 21 
 22 #define AX25_BPQ_HEADER_LEN             16
 23 #define AX25_KISS_HEADER_LEN            1
 24 
 25 #define AX25_HEADER_LEN                 17
 26 #define AX25_ADDR_LEN                   7
 27 #define AX25_DIGI_HEADER_LEN            (AX25_MAX_DIGIS * AX25_ADDR_LEN)
 28 #define AX25_MAX_HEADER_LEN             (AX25_HEADER_LEN + AX25_DIGI_HEADER_LEN)
 29 
 30 /* AX.25 Protocol IDs */
 31 #define AX25_P_ROSE                     0x01
 32 #define AX25_P_VJCOMP                   0x06    /* Compressed TCP/IP packet   */
 33                                                 /* Van Jacobsen (RFC 1144)    */
 34 #define AX25_P_VJUNCOMP                 0x07    /* Uncompressed TCP/IP packet */
 35                                                 /* Van Jacobsen (RFC 1144)    */
 36 #define AX25_P_SEGMENT                  0x08    /* Segmentation fragment      */
 37 #define AX25_P_TEXNET                   0xc3    /* TEXTNET datagram protocol  */
 38 #define AX25_P_LQ                       0xc4    /* Link Quality Protocol      */
 39 #define AX25_P_ATALK                    0xca    /* Appletalk                  */
 40 #define AX25_P_ATALK_ARP                0xcb    /* Appletalk ARP              */
 41 #define AX25_P_IP                       0xcc    /* ARPA Internet Protocol     */
 42 #define AX25_P_ARP                      0xcd    /* ARPA Address Resolution    */
 43 #define AX25_P_FLEXNET                  0xce    /* FlexNet                    */
 44 #define AX25_P_NETROM                   0xcf    /* NET/ROM                    */
 45 #define AX25_P_TEXT                     0xF0    /* No layer 3 protocol impl.  */
 46 
 47 /* AX.25 Segment control values */
 48 #define AX25_SEG_REM                    0x7F
 49 #define AX25_SEG_FIRST                  0x80
 50 
 51 #define AX25_CBIT                       0x80    /* Command/Response bit */
 52 #define AX25_EBIT                       0x01    /* HDLC Address Extension bit */
 53 #define AX25_HBIT                       0x80    /* Has been repeated bit */
 54 
 55 #define AX25_SSSID_SPARE                0x60    /* Unused bits in SSID for standard AX.25 */
 56 #define AX25_ESSID_SPARE                0x20    /* Unused bits in SSID for extended AX.25 */
 57 #define AX25_DAMA_FLAG                  0x20    /* Well, it is *NOT* unused! (dl1bke 951121 */
 58 
 59 #define AX25_COND_ACK_PENDING           0x01
 60 #define AX25_COND_REJECT                0x02
 61 #define AX25_COND_PEER_RX_BUSY          0x04
 62 #define AX25_COND_OWN_RX_BUSY           0x08
 63 #define AX25_COND_DAMA_MODE             0x10
 64 
 65 #ifndef _LINUX_NETDEVICE_H
 66 #include <linux/netdevice.h>
 67 #endif
 68 
 69 /* Upper sub-layer (LAPB) definitions */
 70 
 71 /* Control field templates */
 72 #define AX25_I                  0x00    /* Information frames */
 73 #define AX25_S                  0x01    /* Supervisory frames */
 74 #define AX25_RR                 0x01    /* Receiver ready */
 75 #define AX25_RNR                0x05    /* Receiver not ready */
 76 #define AX25_REJ                0x09    /* Reject */
 77 #define AX25_U                  0x03    /* Unnumbered frames */
 78 #define AX25_SABM               0x2f    /* Set Asynchronous Balanced Mode */
 79 #define AX25_SABME              0x6f    /* Set Asynchronous Balanced Mode Extended */
 80 #define AX25_DISC               0x43    /* Disconnect */
 81 #define AX25_DM                 0x0f    /* Disconnected mode */
 82 #define AX25_UA                 0x63    /* Unnumbered acknowledge */
 83 #define AX25_FRMR               0x87    /* Frame reject */
 84 #define AX25_UI                 0x03    /* Unnumbered information */
 85 #define AX25_XID                0xaf    /* Exchange information */
 86 #define AX25_TEST               0xe3    /* Test */
 87 
 88 #define AX25_PF                 0x10    /* Poll/final bit for standard AX.25 */
 89 #define AX25_EPF                0x01    /* Poll/final bit for extended AX.25 */
 90 
 91 #define AX25_ILLEGAL            0x100   /* Impossible to be a real frame type */
 92 
 93 #define AX25_POLLOFF            0
 94 #define AX25_POLLON             1
 95 
 96 /* AX25 L2 C-bit */
 97 #define AX25_COMMAND            1
 98 #define AX25_RESPONSE           2
 99 
100 /* Define Link State constants. */
101 
102 enum { 
103         AX25_STATE_0,                   /* Listening */
104         AX25_STATE_1,                   /* SABM sent */
105         AX25_STATE_2,                   /* DISC sent */
106         AX25_STATE_3,                   /* Established */
107         AX25_STATE_4                    /* Recovery */
108 };
109 
110 #define AX25_MODULUS            8       /*  Standard AX.25 modulus */
111 #define AX25_EMODULUS           128     /*  Extended AX.25 modulus */
112 
113 enum {
114         AX25_PROTO_STD_SIMPLEX,
115         AX25_PROTO_STD_DUPLEX,
116 #ifdef CONFIG_AX25_DAMA_SLAVE
117         AX25_PROTO_DAMA_SLAVE,
118 #ifdef CONFIG_AX25_DAMA_MASTER
119         AX25_PROTO_DAMA_MASTER,
120 #define AX25_PROTO_MAX AX25_PROTO_DAMA_MASTER
121 #endif
122 #endif
123         __AX25_PROTO_MAX,
124         AX25_PROTO_MAX = __AX25_PROTO_MAX -1
125 };
126 
127 enum {
128         AX25_VALUES_IPDEFMODE,  /* 0=DG 1=VC */
129         AX25_VALUES_AXDEFMODE,  /* 0=Normal 1=Extended Seq Nos */
130         AX25_VALUES_BACKOFF,    /* 0=None 1=Linear 2=Exponential */
131         AX25_VALUES_CONMODE,    /* Allow connected modes - 0=No 1=no "PID text" 2=all PIDs */
132         AX25_VALUES_WINDOW,     /* Default window size for standard AX.25 */
133         AX25_VALUES_EWINDOW,    /* Default window size for extended AX.25 */
134         AX25_VALUES_T1,         /* Default T1 timeout value */
135         AX25_VALUES_T2,         /* Default T2 timeout value */
136         AX25_VALUES_T3,         /* Default T3 timeout value */
137         AX25_VALUES_IDLE,       /* Connected mode idle timer */
138         AX25_VALUES_N2,         /* Default N2 value */
139         AX25_VALUES_PACLEN,     /* AX.25 MTU */
140         AX25_VALUES_PROTOCOL,   /* Std AX.25, DAMA Slave, DAMA Master */
141         AX25_VALUES_DS_TIMEOUT, /* DAMA Slave timeout */
142         AX25_MAX_VALUES         /* THIS MUST REMAIN THE LAST ENTRY OF THIS LIST */
143 };
144 
145 #define AX25_DEF_IPDEFMODE      0                       /* Datagram */
146 #define AX25_DEF_AXDEFMODE      0                       /* Normal */
147 #define AX25_DEF_BACKOFF        1                       /* Linear backoff */
148 #define AX25_DEF_CONMODE        2                       /* Connected mode allowed */
149 #define AX25_DEF_WINDOW         2                       /* Window=2 */
150 #define AX25_DEF_EWINDOW        32                      /* Module-128 Window=32 */
151 #define AX25_DEF_T1             10000                   /* T1=10s */
152 #define AX25_DEF_T2             3000                    /* T2=3s  */
153 #define AX25_DEF_T3             300000                  /* T3=300s */
154 #define AX25_DEF_N2             10                      /* N2=10 */
155 #define AX25_DEF_IDLE           0                       /* Idle=None */
156 #define AX25_DEF_PACLEN         256                     /* Paclen=256 */
157 #define AX25_DEF_PROTOCOL       AX25_PROTO_STD_SIMPLEX  /* Standard AX.25 */
158 #define AX25_DEF_DS_TIMEOUT     180000                  /* DAMA timeout 3 minutes */
159 
160 typedef struct ax25_uid_assoc {
161         struct hlist_node       uid_node;
162         refcount_t              refcount;
163         kuid_t                  uid;
164         ax25_address            call;
165 } ax25_uid_assoc;
166 
167 #define ax25_uid_for_each(__ax25, list) \
168         hlist_for_each_entry(__ax25, list, uid_node)
169 
170 #define ax25_uid_hold(ax25) \
171         refcount_inc(&((ax25)->refcount))
172 
173 static inline void ax25_uid_put(ax25_uid_assoc *assoc)
174 {
175         if (refcount_dec_and_test(&assoc->refcount)) {
176                 kfree(assoc);
177         }
178 }
179 
180 typedef struct {
181         ax25_address            calls[AX25_MAX_DIGIS];
182         unsigned char           repeated[AX25_MAX_DIGIS];
183         unsigned char           ndigi;
184         signed char             lastrepeat;
185 } ax25_digi;
186 
187 typedef struct ax25_route {
188         struct ax25_route       *next;
189         refcount_t              refcount;
190         ax25_address            callsign;
191         struct net_device       *dev;
192         ax25_digi               *digipeat;
193         char                    ip_mode;
194 } ax25_route;
195 
196 static inline void ax25_hold_route(ax25_route *ax25_rt)
197 {
198         refcount_inc(&ax25_rt->refcount);
199 }
200 
201 void __ax25_put_route(ax25_route *ax25_rt);
202 
203 static inline void ax25_put_route(ax25_route *ax25_rt)
204 {
205         if (refcount_dec_and_test(&ax25_rt->refcount))
206                 __ax25_put_route(ax25_rt);
207 }
208 
209 typedef struct {
210         char                    slave;                  /* slave_mode?   */
211         struct timer_list       slave_timer;            /* timeout timer */
212         unsigned short          slave_timeout;          /* when? */
213 } ax25_dama_info;
214 
215 struct ctl_table;
216 
217 typedef struct ax25_dev {
218         struct ax25_dev         *next;
219         struct net_device       *dev;
220         struct net_device       *forward;
221         struct ctl_table_header *sysheader;
222         int                     values[AX25_MAX_VALUES];
223 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
224         ax25_dama_info          dama;
225 #endif
226 } ax25_dev;
227 
228 typedef struct ax25_cb {
229         struct hlist_node       ax25_node;
230         ax25_address            source_addr, dest_addr;
231         ax25_digi               *digipeat;
232         ax25_dev                *ax25_dev;
233         unsigned char           iamdigi;
234         unsigned char           state, modulus, pidincl;
235         unsigned short          vs, vr, va;
236         unsigned char           condition, backoff;
237         unsigned char           n2, n2count;
238         struct timer_list       t1timer, t2timer, t3timer, idletimer;
239         unsigned long           t1, t2, t3, idle, rtt;
240         unsigned short          paclen, fragno, fraglen;
241         struct sk_buff_head     write_queue;
242         struct sk_buff_head     reseq_queue;
243         struct sk_buff_head     ack_queue;
244         struct sk_buff_head     frag_queue;
245         unsigned char           window;
246         struct timer_list       timer, dtimer;
247         struct sock             *sk;            /* Backlink to socket */
248         refcount_t              refcount;
249 } ax25_cb;
250 
251 struct ax25_sock {
252         struct sock             sk;
253         struct ax25_cb          *cb;
254 };
255 
256 static inline struct ax25_sock *ax25_sk(const struct sock *sk)
257 {
258         return (struct ax25_sock *) sk;
259 }
260 
261 static inline struct ax25_cb *sk_to_ax25(const struct sock *sk)
262 {
263         return ax25_sk(sk)->cb;
264 }
265 
266 #define ax25_for_each(__ax25, list) \
267         hlist_for_each_entry(__ax25, list, ax25_node)
268 
269 #define ax25_cb_hold(__ax25) \
270         refcount_inc(&((__ax25)->refcount))
271 
272 static __inline__ void ax25_cb_put(ax25_cb *ax25)
273 {
274         if (refcount_dec_and_test(&ax25->refcount)) {
275                 kfree(ax25->digipeat);
276                 kfree(ax25);
277         }
278 }
279 
280 static inline __be16 ax25_type_trans(struct sk_buff *skb, struct net_device *dev)
281 {
282         skb->dev      = dev;
283         skb_reset_mac_header(skb);
284         skb->pkt_type = PACKET_HOST;
285         return htons(ETH_P_AX25);
286 }
287 
288 /* af_ax25.c */
289 extern struct hlist_head ax25_list;
290 extern spinlock_t ax25_list_lock;
291 void ax25_cb_add(ax25_cb *);
292 struct sock *ax25_find_listener(ax25_address *, int, struct net_device *, int);
293 struct sock *ax25_get_socket(ax25_address *, ax25_address *, int);
294 ax25_cb *ax25_find_cb(ax25_address *, ax25_address *, ax25_digi *,
295                       struct net_device *);
296 void ax25_send_to_raw(ax25_address *, struct sk_buff *, int);
297 void ax25_destroy_socket(ax25_cb *);
298 ax25_cb * __must_check ax25_create_cb(void);
299 void ax25_fillin_cb(ax25_cb *, ax25_dev *);
300 struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
301 
302 /* ax25_addr.c */
303 extern const ax25_address ax25_bcast;
304 extern const ax25_address ax25_defaddr;
305 extern const ax25_address null_ax25_address;
306 char *ax2asc(char *buf, const ax25_address *);
307 void asc2ax(ax25_address *addr, const char *callsign);
308 int ax25cmp(const ax25_address *, const ax25_address *);
309 int ax25digicmp(const ax25_digi *, const ax25_digi *);
310 const unsigned char *ax25_addr_parse(const unsigned char *, int,
311         ax25_address *, ax25_address *, ax25_digi *, int *, int *);
312 int ax25_addr_build(unsigned char *, const ax25_address *,
313                     const ax25_address *, const ax25_digi *, int, int);
314 int ax25_addr_size(const ax25_digi *);
315 void ax25_digi_invert(const ax25_digi *, ax25_digi *);
316 
317 /* ax25_dev.c */
318 extern ax25_dev *ax25_dev_list;
319 extern spinlock_t ax25_dev_lock;
320 
321 static inline ax25_dev *ax25_dev_ax25dev(struct net_device *dev)
322 {
323         return dev->ax25_ptr;
324 }
325 
326 ax25_dev *ax25_addr_ax25dev(ax25_address *);
327 void ax25_dev_device_up(struct net_device *);
328 void ax25_dev_device_down(struct net_device *);
329 int ax25_fwd_ioctl(unsigned int, struct ax25_fwd_struct *);
330 struct net_device *ax25_fwd_dev(struct net_device *);
331 void ax25_dev_free(void);
332 
333 /* ax25_ds_in.c */
334 int ax25_ds_frame_in(ax25_cb *, struct sk_buff *, int);
335 
336 /* ax25_ds_subr.c */
337 void ax25_ds_nr_error_recovery(ax25_cb *);
338 void ax25_ds_enquiry_response(ax25_cb *);
339 void ax25_ds_establish_data_link(ax25_cb *);
340 void ax25_dev_dama_off(ax25_dev *);
341 void ax25_dama_on(ax25_cb *);
342 void ax25_dama_off(ax25_cb *);
343 
344 /* ax25_ds_timer.c */
345 void ax25_ds_setup_timer(ax25_dev *);
346 void ax25_ds_set_timer(ax25_dev *);
347 void ax25_ds_del_timer(ax25_dev *);
348 void ax25_ds_timer(ax25_cb *);
349 void ax25_ds_t1_timeout(ax25_cb *);
350 void ax25_ds_heartbeat_expiry(ax25_cb *);
351 void ax25_ds_t3timer_expiry(ax25_cb *);
352 void ax25_ds_idletimer_expiry(ax25_cb *);
353 
354 /* ax25_iface.c */
355 
356 struct ax25_protocol {
357         struct ax25_protocol *next;
358         unsigned int pid;
359         int (*func)(struct sk_buff *, ax25_cb *);
360 };
361 
362 void ax25_register_pid(struct ax25_protocol *ap);
363 void ax25_protocol_release(unsigned int);
364 
365 struct ax25_linkfail {
366         struct hlist_node lf_node;
367         void (*func)(ax25_cb *, int);
368 };
369 
370 void ax25_linkfail_register(struct ax25_linkfail *lf);
371 void ax25_linkfail_release(struct ax25_linkfail *lf);
372 int __must_check ax25_listen_register(ax25_address *, struct net_device *);
373 void ax25_listen_release(ax25_address *, struct net_device *);
374 int(*ax25_protocol_function(unsigned int))(struct sk_buff *, ax25_cb *);
375 int ax25_listen_mine(ax25_address *, struct net_device *);
376 void ax25_link_failed(ax25_cb *, int);
377 int ax25_protocol_is_registered(unsigned int);
378 
379 /* ax25_in.c */
380 int ax25_rx_iframe(ax25_cb *, struct sk_buff *);
381 int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *,
382                   struct net_device *);
383 
384 /* ax25_ip.c */
385 netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
386 extern const struct header_ops ax25_header_ops;
387 
388 /* ax25_out.c */
389 ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *,
390                          ax25_digi *, struct net_device *);
391 void ax25_output(ax25_cb *, int, struct sk_buff *);
392 void ax25_kick(ax25_cb *);
393 void ax25_transmit_buffer(ax25_cb *, struct sk_buff *, int);
394 void ax25_queue_xmit(struct sk_buff *skb, struct net_device *dev);
395 int ax25_check_iframes_acked(ax25_cb *, unsigned short);
396 
397 /* ax25_route.c */
398 void ax25_rt_device_down(struct net_device *);
399 int ax25_rt_ioctl(unsigned int, void __user *);
400 extern const struct file_operations ax25_route_fops;
401 ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev);
402 int ax25_rt_autobind(ax25_cb *, ax25_address *);
403 struct sk_buff *ax25_rt_build_path(struct sk_buff *, ax25_address *,
404                                    ax25_address *, ax25_digi *);
405 void ax25_rt_free(void);
406 
407 /* ax25_std_in.c */
408 int ax25_std_frame_in(ax25_cb *, struct sk_buff *, int);
409 
410 /* ax25_std_subr.c */
411 void ax25_std_nr_error_recovery(ax25_cb *);
412 void ax25_std_establish_data_link(ax25_cb *);
413 void ax25_std_transmit_enquiry(ax25_cb *);
414 void ax25_std_enquiry_response(ax25_cb *);
415 void ax25_std_timeout_response(ax25_cb *);
416 
417 /* ax25_std_timer.c */
418 void ax25_std_heartbeat_expiry(ax25_cb *);
419 void ax25_std_t1timer_expiry(ax25_cb *);
420 void ax25_std_t2timer_expiry(ax25_cb *);
421 void ax25_std_t3timer_expiry(ax25_cb *);
422 void ax25_std_idletimer_expiry(ax25_cb *);
423 
424 /* ax25_subr.c */
425 void ax25_clear_queues(ax25_cb *);
426 void ax25_frames_acked(ax25_cb *, unsigned short);
427 void ax25_requeue_frames(ax25_cb *);
428 int ax25_validate_nr(ax25_cb *, unsigned short);
429 int ax25_decode(ax25_cb *, struct sk_buff *, int *, int *, int *);
430 void ax25_send_control(ax25_cb *, int, int, int);
431 void ax25_return_dm(struct net_device *, ax25_address *, ax25_address *,
432                     ax25_digi *);
433 void ax25_calculate_t1(ax25_cb *);
434 void ax25_calculate_rtt(ax25_cb *);
435 void ax25_disconnect(ax25_cb *, int);
436 
437 /* ax25_timer.c */
438 void ax25_setup_timers(ax25_cb *);
439 void ax25_start_heartbeat(ax25_cb *);
440 void ax25_start_t1timer(ax25_cb *);
441 void ax25_start_t2timer(ax25_cb *);
442 void ax25_start_t3timer(ax25_cb *);
443 void ax25_start_idletimer(ax25_cb *);
444 void ax25_stop_heartbeat(ax25_cb *);
445 void ax25_stop_t1timer(ax25_cb *);
446 void ax25_stop_t2timer(ax25_cb *);
447 void ax25_stop_t3timer(ax25_cb *);
448 void ax25_stop_idletimer(ax25_cb *);
449 int ax25_t1timer_running(ax25_cb *);
450 unsigned long ax25_display_timer(struct timer_list *);
451 
452 /* ax25_uid.c */
453 extern int  ax25_uid_policy;
454 ax25_uid_assoc *ax25_findbyuid(kuid_t);
455 int __must_check ax25_uid_ioctl(int, struct sockaddr_ax25 *);
456 extern const struct file_operations ax25_uid_fops;
457 void ax25_uid_free(void);
458 
459 /* sysctl_net_ax25.c */
460 #ifdef CONFIG_SYSCTL
461 int ax25_register_dev_sysctl(ax25_dev *ax25_dev);
462 void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev);
463 #else
464 static inline int ax25_register_dev_sysctl(ax25_dev *ax25_dev) { return 0; }
465 static inline void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev) {}
466 #endif /* CONFIG_SYSCTL */
467 
468 #endif
469 

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