Root/
1 | /* |
2 | * LAPB release 002 |
3 | * |
4 | * This code REQUIRES 2.1.15 or higher/ NET3.038 |
5 | * |
6 | * This module: |
7 | * This module is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License |
9 | * as published by the Free Software Foundation; either version |
10 | * 2 of the License, or (at your option) any later version. |
11 | * |
12 | * History |
13 | * LAPB 001 Jonathan Naulor Started Coding |
14 | * LAPB 002 Jonathan Naylor New timer architecture. |
15 | * 2000-10-29 Henner Eisen lapb_data_indication() return status. |
16 | */ |
17 | |
18 | #include <linux/errno.h> |
19 | #include <linux/types.h> |
20 | #include <linux/socket.h> |
21 | #include <linux/in.h> |
22 | #include <linux/kernel.h> |
23 | #include <linux/timer.h> |
24 | #include <linux/string.h> |
25 | #include <linux/sockios.h> |
26 | #include <linux/net.h> |
27 | #include <linux/inet.h> |
28 | #include <linux/netdevice.h> |
29 | #include <linux/skbuff.h> |
30 | #include <linux/slab.h> |
31 | #include <net/sock.h> |
32 | #include <asm/uaccess.h> |
33 | #include <asm/system.h> |
34 | #include <linux/fcntl.h> |
35 | #include <linux/mm.h> |
36 | #include <linux/interrupt.h> |
37 | #include <net/lapb.h> |
38 | |
39 | /* |
40 | * State machine for state 0, Disconnected State. |
41 | * The handling of the timer(s) is in file lapb_timer.c. |
42 | */ |
43 | static void lapb_state0_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
44 | struct lapb_frame *frame) |
45 | { |
46 | switch (frame->type) { |
47 | case LAPB_SABM: |
48 | #if LAPB_DEBUG > 1 |
49 | printk(KERN_DEBUG "lapb: (%p) S0 RX SABM(%d)\n", |
50 | lapb->dev, frame->pf); |
51 | #endif |
52 | if (lapb->mode & LAPB_EXTENDED) { |
53 | #if LAPB_DEBUG > 1 |
54 | printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", |
55 | lapb->dev, frame->pf); |
56 | #endif |
57 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
58 | LAPB_RESPONSE); |
59 | } else { |
60 | #if LAPB_DEBUG > 1 |
61 | printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", |
62 | lapb->dev, frame->pf); |
63 | #endif |
64 | #if LAPB_DEBUG > 0 |
65 | printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", |
66 | lapb->dev); |
67 | #endif |
68 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
69 | LAPB_RESPONSE); |
70 | lapb_stop_t1timer(lapb); |
71 | lapb_stop_t2timer(lapb); |
72 | lapb->state = LAPB_STATE_3; |
73 | lapb->condition = 0x00; |
74 | lapb->n2count = 0; |
75 | lapb->vs = 0; |
76 | lapb->vr = 0; |
77 | lapb->va = 0; |
78 | lapb_connect_indication(lapb, LAPB_OK); |
79 | } |
80 | break; |
81 | |
82 | case LAPB_SABME: |
83 | #if LAPB_DEBUG > 1 |
84 | printk(KERN_DEBUG "lapb: (%p) S0 RX SABME(%d)\n", |
85 | lapb->dev, frame->pf); |
86 | #endif |
87 | if (lapb->mode & LAPB_EXTENDED) { |
88 | #if LAPB_DEBUG > 1 |
89 | printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", |
90 | lapb->dev, frame->pf); |
91 | #endif |
92 | #if LAPB_DEBUG > 0 |
93 | printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", |
94 | lapb->dev); |
95 | #endif |
96 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
97 | LAPB_RESPONSE); |
98 | lapb_stop_t1timer(lapb); |
99 | lapb_stop_t2timer(lapb); |
100 | lapb->state = LAPB_STATE_3; |
101 | lapb->condition = 0x00; |
102 | lapb->n2count = 0; |
103 | lapb->vs = 0; |
104 | lapb->vr = 0; |
105 | lapb->va = 0; |
106 | lapb_connect_indication(lapb, LAPB_OK); |
107 | } else { |
108 | #if LAPB_DEBUG > 1 |
109 | printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", |
110 | lapb->dev, frame->pf); |
111 | #endif |
112 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
113 | LAPB_RESPONSE); |
114 | } |
115 | break; |
116 | |
117 | case LAPB_DISC: |
118 | #if LAPB_DEBUG > 1 |
119 | printk(KERN_DEBUG "lapb: (%p) S0 RX DISC(%d)\n", |
120 | lapb->dev, frame->pf); |
121 | printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", |
122 | lapb->dev, frame->pf); |
123 | #endif |
124 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
125 | LAPB_RESPONSE); |
126 | break; |
127 | |
128 | default: |
129 | break; |
130 | } |
131 | |
132 | kfree_skb(skb); |
133 | } |
134 | |
135 | /* |
136 | * State machine for state 1, Awaiting Connection State. |
137 | * The handling of the timer(s) is in file lapb_timer.c. |
138 | */ |
139 | static void lapb_state1_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
140 | struct lapb_frame *frame) |
141 | { |
142 | switch (frame->type) { |
143 | case LAPB_SABM: |
144 | #if LAPB_DEBUG > 1 |
145 | printk(KERN_DEBUG "lapb: (%p) S1 RX SABM(%d)\n", |
146 | lapb->dev, frame->pf); |
147 | #endif |
148 | if (lapb->mode & LAPB_EXTENDED) { |
149 | #if LAPB_DEBUG > 1 |
150 | printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", |
151 | lapb->dev, frame->pf); |
152 | #endif |
153 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
154 | LAPB_RESPONSE); |
155 | } else { |
156 | #if LAPB_DEBUG > 1 |
157 | printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", |
158 | lapb->dev, frame->pf); |
159 | #endif |
160 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
161 | LAPB_RESPONSE); |
162 | } |
163 | break; |
164 | |
165 | case LAPB_SABME: |
166 | #if LAPB_DEBUG > 1 |
167 | printk(KERN_DEBUG "lapb: (%p) S1 RX SABME(%d)\n", |
168 | lapb->dev, frame->pf); |
169 | #endif |
170 | if (lapb->mode & LAPB_EXTENDED) { |
171 | #if LAPB_DEBUG > 1 |
172 | printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", |
173 | lapb->dev, frame->pf); |
174 | #endif |
175 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
176 | LAPB_RESPONSE); |
177 | } else { |
178 | #if LAPB_DEBUG > 1 |
179 | printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", |
180 | lapb->dev, frame->pf); |
181 | #endif |
182 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
183 | LAPB_RESPONSE); |
184 | } |
185 | break; |
186 | |
187 | case LAPB_DISC: |
188 | #if LAPB_DEBUG > 1 |
189 | printk(KERN_DEBUG "lapb: (%p) S1 RX DISC(%d)\n", |
190 | lapb->dev, frame->pf); |
191 | printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", |
192 | lapb->dev, frame->pf); |
193 | #endif |
194 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
195 | LAPB_RESPONSE); |
196 | break; |
197 | |
198 | case LAPB_UA: |
199 | #if LAPB_DEBUG > 1 |
200 | printk(KERN_DEBUG "lapb: (%p) S1 RX UA(%d)\n", |
201 | lapb->dev, frame->pf); |
202 | #endif |
203 | if (frame->pf) { |
204 | #if LAPB_DEBUG > 0 |
205 | printk(KERN_DEBUG "lapb: (%p) S1 -> S3\n", |
206 | lapb->dev); |
207 | #endif |
208 | lapb_stop_t1timer(lapb); |
209 | lapb_stop_t2timer(lapb); |
210 | lapb->state = LAPB_STATE_3; |
211 | lapb->condition = 0x00; |
212 | lapb->n2count = 0; |
213 | lapb->vs = 0; |
214 | lapb->vr = 0; |
215 | lapb->va = 0; |
216 | lapb_connect_confirmation(lapb, LAPB_OK); |
217 | } |
218 | break; |
219 | |
220 | case LAPB_DM: |
221 | #if LAPB_DEBUG > 1 |
222 | printk(KERN_DEBUG "lapb: (%p) S1 RX DM(%d)\n", |
223 | lapb->dev, frame->pf); |
224 | #endif |
225 | if (frame->pf) { |
226 | #if LAPB_DEBUG > 0 |
227 | printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", |
228 | lapb->dev); |
229 | #endif |
230 | lapb_clear_queues(lapb); |
231 | lapb->state = LAPB_STATE_0; |
232 | lapb_start_t1timer(lapb); |
233 | lapb_stop_t2timer(lapb); |
234 | lapb_disconnect_indication(lapb, LAPB_REFUSED); |
235 | } |
236 | break; |
237 | } |
238 | |
239 | kfree_skb(skb); |
240 | } |
241 | |
242 | /* |
243 | * State machine for state 2, Awaiting Release State. |
244 | * The handling of the timer(s) is in file lapb_timer.c |
245 | */ |
246 | static void lapb_state2_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
247 | struct lapb_frame *frame) |
248 | { |
249 | switch (frame->type) { |
250 | case LAPB_SABM: |
251 | case LAPB_SABME: |
252 | #if LAPB_DEBUG > 1 |
253 | printk(KERN_DEBUG "lapb: (%p) S2 RX {SABM,SABME}(%d)\n", |
254 | lapb->dev, frame->pf); |
255 | printk(KERN_DEBUG "lapb: (%p) S2 TX DM(%d)\n", |
256 | lapb->dev, frame->pf); |
257 | #endif |
258 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
259 | LAPB_RESPONSE); |
260 | break; |
261 | |
262 | case LAPB_DISC: |
263 | #if LAPB_DEBUG > 1 |
264 | printk(KERN_DEBUG "lapb: (%p) S2 RX DISC(%d)\n", |
265 | lapb->dev, frame->pf); |
266 | printk(KERN_DEBUG "lapb: (%p) S2 TX UA(%d)\n", |
267 | lapb->dev, frame->pf); |
268 | #endif |
269 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
270 | LAPB_RESPONSE); |
271 | break; |
272 | |
273 | case LAPB_UA: |
274 | #if LAPB_DEBUG > 1 |
275 | printk(KERN_DEBUG "lapb: (%p) S2 RX UA(%d)\n", |
276 | lapb->dev, frame->pf); |
277 | #endif |
278 | if (frame->pf) { |
279 | #if LAPB_DEBUG > 0 |
280 | printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", |
281 | lapb->dev); |
282 | #endif |
283 | lapb->state = LAPB_STATE_0; |
284 | lapb_start_t1timer(lapb); |
285 | lapb_stop_t2timer(lapb); |
286 | lapb_disconnect_confirmation(lapb, LAPB_OK); |
287 | } |
288 | break; |
289 | |
290 | case LAPB_DM: |
291 | #if LAPB_DEBUG > 1 |
292 | printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", |
293 | lapb->dev, frame->pf); |
294 | #endif |
295 | if (frame->pf) { |
296 | #if LAPB_DEBUG > 0 |
297 | printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", |
298 | lapb->dev); |
299 | #endif |
300 | lapb->state = LAPB_STATE_0; |
301 | lapb_start_t1timer(lapb); |
302 | lapb_stop_t2timer(lapb); |
303 | lapb_disconnect_confirmation(lapb, |
304 | LAPB_NOTCONNECTED); |
305 | } |
306 | break; |
307 | |
308 | case LAPB_I: |
309 | case LAPB_REJ: |
310 | case LAPB_RNR: |
311 | case LAPB_RR: |
312 | #if LAPB_DEBUG > 1 |
313 | printk(KERN_DEBUG "lapb: (%p) S2 RX {I,REJ,RNR,RR}" |
314 | "(%d)\n", lapb->dev, frame->pf); |
315 | printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", |
316 | lapb->dev, frame->pf); |
317 | #endif |
318 | if (frame->pf) |
319 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
320 | LAPB_RESPONSE); |
321 | break; |
322 | } |
323 | |
324 | kfree_skb(skb); |
325 | } |
326 | |
327 | /* |
328 | * State machine for state 3, Connected State. |
329 | * The handling of the timer(s) is in file lapb_timer.c |
330 | */ |
331 | static void lapb_state3_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
332 | struct lapb_frame *frame) |
333 | { |
334 | int queued = 0; |
335 | int modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : |
336 | LAPB_SMODULUS; |
337 | |
338 | switch (frame->type) { |
339 | case LAPB_SABM: |
340 | #if LAPB_DEBUG > 1 |
341 | printk(KERN_DEBUG "lapb: (%p) S3 RX SABM(%d)\n", |
342 | lapb->dev, frame->pf); |
343 | #endif |
344 | if (lapb->mode & LAPB_EXTENDED) { |
345 | #if LAPB_DEBUG > 1 |
346 | printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", |
347 | lapb->dev, frame->pf); |
348 | #endif |
349 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
350 | LAPB_RESPONSE); |
351 | } else { |
352 | #if LAPB_DEBUG > 1 |
353 | printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", |
354 | lapb->dev, frame->pf); |
355 | #endif |
356 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
357 | LAPB_RESPONSE); |
358 | lapb_stop_t1timer(lapb); |
359 | lapb_stop_t2timer(lapb); |
360 | lapb->condition = 0x00; |
361 | lapb->n2count = 0; |
362 | lapb->vs = 0; |
363 | lapb->vr = 0; |
364 | lapb->va = 0; |
365 | lapb_requeue_frames(lapb); |
366 | } |
367 | break; |
368 | |
369 | case LAPB_SABME: |
370 | #if LAPB_DEBUG > 1 |
371 | printk(KERN_DEBUG "lapb: (%p) S3 RX SABME(%d)\n", |
372 | lapb->dev, frame->pf); |
373 | #endif |
374 | if (lapb->mode & LAPB_EXTENDED) { |
375 | #if LAPB_DEBUG > 1 |
376 | printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", |
377 | lapb->dev, frame->pf); |
378 | #endif |
379 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
380 | LAPB_RESPONSE); |
381 | lapb_stop_t1timer(lapb); |
382 | lapb_stop_t2timer(lapb); |
383 | lapb->condition = 0x00; |
384 | lapb->n2count = 0; |
385 | lapb->vs = 0; |
386 | lapb->vr = 0; |
387 | lapb->va = 0; |
388 | lapb_requeue_frames(lapb); |
389 | } else { |
390 | #if LAPB_DEBUG > 1 |
391 | printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", |
392 | lapb->dev, frame->pf); |
393 | #endif |
394 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
395 | LAPB_RESPONSE); |
396 | } |
397 | break; |
398 | |
399 | case LAPB_DISC: |
400 | #if LAPB_DEBUG > 1 |
401 | printk(KERN_DEBUG "lapb: (%p) S3 RX DISC(%d)\n", |
402 | lapb->dev, frame->pf); |
403 | #endif |
404 | #if LAPB_DEBUG > 0 |
405 | printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", |
406 | lapb->dev); |
407 | #endif |
408 | lapb_clear_queues(lapb); |
409 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
410 | LAPB_RESPONSE); |
411 | lapb_start_t1timer(lapb); |
412 | lapb_stop_t2timer(lapb); |
413 | lapb->state = LAPB_STATE_0; |
414 | lapb_disconnect_indication(lapb, LAPB_OK); |
415 | break; |
416 | |
417 | case LAPB_DM: |
418 | #if LAPB_DEBUG > 1 |
419 | printk(KERN_DEBUG "lapb: (%p) S3 RX DM(%d)\n", |
420 | lapb->dev, frame->pf); |
421 | #endif |
422 | #if LAPB_DEBUG > 0 |
423 | printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", |
424 | lapb->dev); |
425 | #endif |
426 | lapb_clear_queues(lapb); |
427 | lapb->state = LAPB_STATE_0; |
428 | lapb_start_t1timer(lapb); |
429 | lapb_stop_t2timer(lapb); |
430 | lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED); |
431 | break; |
432 | |
433 | case LAPB_RNR: |
434 | #if LAPB_DEBUG > 1 |
435 | printk(KERN_DEBUG "lapb: (%p) S3 RX RNR(%d) R%d\n", |
436 | lapb->dev, frame->pf, frame->nr); |
437 | #endif |
438 | lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION; |
439 | lapb_check_need_response(lapb, frame->cr, frame->pf); |
440 | if (lapb_validate_nr(lapb, frame->nr)) { |
441 | lapb_check_iframes_acked(lapb, frame->nr); |
442 | } else { |
443 | lapb->frmr_data = *frame; |
444 | lapb->frmr_type = LAPB_FRMR_Z; |
445 | lapb_transmit_frmr(lapb); |
446 | #if LAPB_DEBUG > 0 |
447 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", |
448 | lapb->dev); |
449 | #endif |
450 | lapb_start_t1timer(lapb); |
451 | lapb_stop_t2timer(lapb); |
452 | lapb->state = LAPB_STATE_4; |
453 | lapb->n2count = 0; |
454 | } |
455 | break; |
456 | |
457 | case LAPB_RR: |
458 | #if LAPB_DEBUG > 1 |
459 | printk(KERN_DEBUG "lapb: (%p) S3 RX RR(%d) R%d\n", |
460 | lapb->dev, frame->pf, frame->nr); |
461 | #endif |
462 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
463 | lapb_check_need_response(lapb, frame->cr, frame->pf); |
464 | if (lapb_validate_nr(lapb, frame->nr)) { |
465 | lapb_check_iframes_acked(lapb, frame->nr); |
466 | } else { |
467 | lapb->frmr_data = *frame; |
468 | lapb->frmr_type = LAPB_FRMR_Z; |
469 | lapb_transmit_frmr(lapb); |
470 | #if LAPB_DEBUG > 0 |
471 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", |
472 | lapb->dev); |
473 | #endif |
474 | lapb_start_t1timer(lapb); |
475 | lapb_stop_t2timer(lapb); |
476 | lapb->state = LAPB_STATE_4; |
477 | lapb->n2count = 0; |
478 | } |
479 | break; |
480 | |
481 | case LAPB_REJ: |
482 | #if LAPB_DEBUG > 1 |
483 | printk(KERN_DEBUG "lapb: (%p) S3 RX REJ(%d) R%d\n", |
484 | lapb->dev, frame->pf, frame->nr); |
485 | #endif |
486 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
487 | lapb_check_need_response(lapb, frame->cr, frame->pf); |
488 | if (lapb_validate_nr(lapb, frame->nr)) { |
489 | lapb_frames_acked(lapb, frame->nr); |
490 | lapb_stop_t1timer(lapb); |
491 | lapb->n2count = 0; |
492 | lapb_requeue_frames(lapb); |
493 | } else { |
494 | lapb->frmr_data = *frame; |
495 | lapb->frmr_type = LAPB_FRMR_Z; |
496 | lapb_transmit_frmr(lapb); |
497 | #if LAPB_DEBUG > 0 |
498 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", |
499 | lapb->dev); |
500 | #endif |
501 | lapb_start_t1timer(lapb); |
502 | lapb_stop_t2timer(lapb); |
503 | lapb->state = LAPB_STATE_4; |
504 | lapb->n2count = 0; |
505 | } |
506 | break; |
507 | |
508 | case LAPB_I: |
509 | #if LAPB_DEBUG > 1 |
510 | printk(KERN_DEBUG "lapb: (%p) S3 RX I(%d) S%d R%d\n", |
511 | lapb->dev, frame->pf, frame->ns, frame->nr); |
512 | #endif |
513 | if (!lapb_validate_nr(lapb, frame->nr)) { |
514 | lapb->frmr_data = *frame; |
515 | lapb->frmr_type = LAPB_FRMR_Z; |
516 | lapb_transmit_frmr(lapb); |
517 | #if LAPB_DEBUG > 0 |
518 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", |
519 | lapb->dev); |
520 | #endif |
521 | lapb_start_t1timer(lapb); |
522 | lapb_stop_t2timer(lapb); |
523 | lapb->state = LAPB_STATE_4; |
524 | lapb->n2count = 0; |
525 | break; |
526 | } |
527 | if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) |
528 | lapb_frames_acked(lapb, frame->nr); |
529 | else |
530 | lapb_check_iframes_acked(lapb, frame->nr); |
531 | |
532 | if (frame->ns == lapb->vr) { |
533 | int cn; |
534 | cn = lapb_data_indication(lapb, skb); |
535 | queued = 1; |
536 | /* |
537 | * If upper layer has dropped the frame, we |
538 | * basically ignore any further protocol |
539 | * processing. This will cause the peer |
540 | * to re-transmit the frame later like |
541 | * a frame lost on the wire. |
542 | */ |
543 | if (cn == NET_RX_DROP) { |
544 | printk(KERN_DEBUG |
545 | "LAPB: rx congestion\n"); |
546 | break; |
547 | } |
548 | lapb->vr = (lapb->vr + 1) % modulus; |
549 | lapb->condition &= ~LAPB_REJECT_CONDITION; |
550 | if (frame->pf) |
551 | lapb_enquiry_response(lapb); |
552 | else { |
553 | if (!(lapb->condition & |
554 | LAPB_ACK_PENDING_CONDITION)) { |
555 | lapb->condition |= LAPB_ACK_PENDING_CONDITION; |
556 | lapb_start_t2timer(lapb); |
557 | } |
558 | } |
559 | } else { |
560 | if (lapb->condition & LAPB_REJECT_CONDITION) { |
561 | if (frame->pf) |
562 | lapb_enquiry_response(lapb); |
563 | } else { |
564 | #if LAPB_DEBUG > 1 |
565 | printk(KERN_DEBUG |
566 | "lapb: (%p) S3 TX REJ(%d) R%d\n", |
567 | lapb->dev, frame->pf, lapb->vr); |
568 | #endif |
569 | lapb->condition |= LAPB_REJECT_CONDITION; |
570 | lapb_send_control(lapb, LAPB_REJ, |
571 | frame->pf, |
572 | LAPB_RESPONSE); |
573 | lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; |
574 | } |
575 | } |
576 | break; |
577 | |
578 | case LAPB_FRMR: |
579 | #if LAPB_DEBUG > 1 |
580 | printk(KERN_DEBUG "lapb: (%p) S3 RX FRMR(%d) %02X " |
581 | "%02X %02X %02X %02X\n", lapb->dev, frame->pf, |
582 | skb->data[0], skb->data[1], skb->data[2], |
583 | skb->data[3], skb->data[4]); |
584 | #endif |
585 | lapb_establish_data_link(lapb); |
586 | #if LAPB_DEBUG > 0 |
587 | printk(KERN_DEBUG "lapb: (%p) S3 -> S1\n", |
588 | lapb->dev); |
589 | #endif |
590 | lapb_requeue_frames(lapb); |
591 | lapb->state = LAPB_STATE_1; |
592 | break; |
593 | |
594 | case LAPB_ILLEGAL: |
595 | #if LAPB_DEBUG > 1 |
596 | printk(KERN_DEBUG "lapb: (%p) S3 RX ILLEGAL(%d)\n", |
597 | lapb->dev, frame->pf); |
598 | #endif |
599 | lapb->frmr_data = *frame; |
600 | lapb->frmr_type = LAPB_FRMR_W; |
601 | lapb_transmit_frmr(lapb); |
602 | #if LAPB_DEBUG > 0 |
603 | printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->dev); |
604 | #endif |
605 | lapb_start_t1timer(lapb); |
606 | lapb_stop_t2timer(lapb); |
607 | lapb->state = LAPB_STATE_4; |
608 | lapb->n2count = 0; |
609 | break; |
610 | } |
611 | |
612 | if (!queued) |
613 | kfree_skb(skb); |
614 | } |
615 | |
616 | /* |
617 | * State machine for state 4, Frame Reject State. |
618 | * The handling of the timer(s) is in file lapb_timer.c. |
619 | */ |
620 | static void lapb_state4_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
621 | struct lapb_frame *frame) |
622 | { |
623 | switch (frame->type) { |
624 | case LAPB_SABM: |
625 | #if LAPB_DEBUG > 1 |
626 | printk(KERN_DEBUG "lapb: (%p) S4 RX SABM(%d)\n", |
627 | lapb->dev, frame->pf); |
628 | #endif |
629 | if (lapb->mode & LAPB_EXTENDED) { |
630 | #if LAPB_DEBUG > 1 |
631 | printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", |
632 | lapb->dev, frame->pf); |
633 | #endif |
634 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
635 | LAPB_RESPONSE); |
636 | } else { |
637 | #if LAPB_DEBUG > 1 |
638 | printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", |
639 | lapb->dev, frame->pf); |
640 | #endif |
641 | #if LAPB_DEBUG > 0 |
642 | printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", |
643 | lapb->dev); |
644 | #endif |
645 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
646 | LAPB_RESPONSE); |
647 | lapb_stop_t1timer(lapb); |
648 | lapb_stop_t2timer(lapb); |
649 | lapb->state = LAPB_STATE_3; |
650 | lapb->condition = 0x00; |
651 | lapb->n2count = 0; |
652 | lapb->vs = 0; |
653 | lapb->vr = 0; |
654 | lapb->va = 0; |
655 | lapb_connect_indication(lapb, LAPB_OK); |
656 | } |
657 | break; |
658 | |
659 | case LAPB_SABME: |
660 | #if LAPB_DEBUG > 1 |
661 | printk(KERN_DEBUG "lapb: (%p) S4 RX SABME(%d)\n", |
662 | lapb->dev, frame->pf); |
663 | #endif |
664 | if (lapb->mode & LAPB_EXTENDED) { |
665 | #if LAPB_DEBUG > 1 |
666 | printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", |
667 | lapb->dev, frame->pf); |
668 | #endif |
669 | #if LAPB_DEBUG > 0 |
670 | printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", |
671 | lapb->dev); |
672 | #endif |
673 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
674 | LAPB_RESPONSE); |
675 | lapb_stop_t1timer(lapb); |
676 | lapb_stop_t2timer(lapb); |
677 | lapb->state = LAPB_STATE_3; |
678 | lapb->condition = 0x00; |
679 | lapb->n2count = 0; |
680 | lapb->vs = 0; |
681 | lapb->vr = 0; |
682 | lapb->va = 0; |
683 | lapb_connect_indication(lapb, LAPB_OK); |
684 | } else { |
685 | #if LAPB_DEBUG > 1 |
686 | printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", |
687 | lapb->dev, frame->pf); |
688 | #endif |
689 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
690 | LAPB_RESPONSE); |
691 | } |
692 | break; |
693 | } |
694 | |
695 | kfree_skb(skb); |
696 | } |
697 | |
698 | /* |
699 | * Process an incoming LAPB frame |
700 | */ |
701 | void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *skb) |
702 | { |
703 | struct lapb_frame frame; |
704 | |
705 | if (lapb_decode(lapb, skb, &frame) < 0) { |
706 | kfree_skb(skb); |
707 | return; |
708 | } |
709 | |
710 | switch (lapb->state) { |
711 | case LAPB_STATE_0: |
712 | lapb_state0_machine(lapb, skb, &frame); break; |
713 | case LAPB_STATE_1: |
714 | lapb_state1_machine(lapb, skb, &frame); break; |
715 | case LAPB_STATE_2: |
716 | lapb_state2_machine(lapb, skb, &frame); break; |
717 | case LAPB_STATE_3: |
718 | lapb_state3_machine(lapb, skb, &frame); break; |
719 | case LAPB_STATE_4: |
720 | lapb_state4_machine(lapb, skb, &frame); break; |
721 | } |
722 | |
723 | lapb_kick(lapb); |
724 | } |
725 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
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master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9