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1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 LT |
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 | } |