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

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