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1da177e4 LT |
1 | /* $Id: isdnl2.c,v 2.30.2.4 2004/02/11 13:21:34 keil Exp $ |
2 | * | |
3 | * Author Karsten Keil | |
4 | * based on the teles driver from Jan den Ouden | |
5 | * Copyright by Karsten Keil <keil@isdn4linux.de> | |
6 | * | |
7 | * This software may be used and distributed according to the terms | |
8 | * of the GNU General Public License, incorporated herein by reference. | |
9 | * | |
10 | * For changes and modifications please read | |
11 | * Documentation/isdn/HiSax.cert | |
12 | * | |
13 | * Thanks to Jan den Ouden | |
14 | * Fritz Elfert | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/init.h> | |
19 | #include "hisax.h" | |
20 | #include "isdnl2.h" | |
21 | ||
22 | const char *l2_revision = "$Revision: 2.30.2.4 $"; | |
23 | ||
24 | static void l2m_debug(struct FsmInst *fi, char *fmt, ...); | |
25 | ||
26 | static struct Fsm l2fsm; | |
27 | ||
28 | enum { | |
29 | ST_L2_1, | |
30 | ST_L2_2, | |
31 | ST_L2_3, | |
32 | ST_L2_4, | |
33 | ST_L2_5, | |
34 | ST_L2_6, | |
35 | ST_L2_7, | |
36 | ST_L2_8, | |
37 | }; | |
38 | ||
39 | #define L2_STATE_COUNT (ST_L2_8+1) | |
40 | ||
41 | static char *strL2State[] = | |
42 | { | |
43 | "ST_L2_1", | |
44 | "ST_L2_2", | |
45 | "ST_L2_3", | |
46 | "ST_L2_4", | |
47 | "ST_L2_5", | |
48 | "ST_L2_6", | |
49 | "ST_L2_7", | |
50 | "ST_L2_8", | |
51 | }; | |
52 | ||
53 | enum { | |
54 | EV_L2_UI, | |
55 | EV_L2_SABME, | |
56 | EV_L2_DISC, | |
57 | EV_L2_DM, | |
58 | EV_L2_UA, | |
59 | EV_L2_FRMR, | |
60 | EV_L2_SUPER, | |
61 | EV_L2_I, | |
62 | EV_L2_DL_DATA, | |
63 | EV_L2_ACK_PULL, | |
64 | EV_L2_DL_UNIT_DATA, | |
65 | EV_L2_DL_ESTABLISH_REQ, | |
66 | EV_L2_DL_RELEASE_REQ, | |
67 | EV_L2_MDL_ASSIGN, | |
68 | EV_L2_MDL_REMOVE, | |
69 | EV_L2_MDL_ERROR, | |
70 | EV_L1_DEACTIVATE, | |
71 | EV_L2_T200, | |
72 | EV_L2_T203, | |
73 | EV_L2_SET_OWN_BUSY, | |
74 | EV_L2_CLEAR_OWN_BUSY, | |
75 | EV_L2_FRAME_ERROR, | |
76 | }; | |
77 | ||
78 | #define L2_EVENT_COUNT (EV_L2_FRAME_ERROR+1) | |
79 | ||
80 | static char *strL2Event[] = | |
81 | { | |
82 | "EV_L2_UI", | |
83 | "EV_L2_SABME", | |
84 | "EV_L2_DISC", | |
85 | "EV_L2_DM", | |
86 | "EV_L2_UA", | |
87 | "EV_L2_FRMR", | |
88 | "EV_L2_SUPER", | |
89 | "EV_L2_I", | |
90 | "EV_L2_DL_DATA", | |
91 | "EV_L2_ACK_PULL", | |
92 | "EV_L2_DL_UNIT_DATA", | |
93 | "EV_L2_DL_ESTABLISH_REQ", | |
94 | "EV_L2_DL_RELEASE_REQ", | |
95 | "EV_L2_MDL_ASSIGN", | |
96 | "EV_L2_MDL_REMOVE", | |
97 | "EV_L2_MDL_ERROR", | |
98 | "EV_L1_DEACTIVATE", | |
99 | "EV_L2_T200", | |
100 | "EV_L2_T203", | |
101 | "EV_L2_SET_OWN_BUSY", | |
102 | "EV_L2_CLEAR_OWN_BUSY", | |
103 | "EV_L2_FRAME_ERROR", | |
104 | }; | |
105 | ||
106 | static int l2addrsize(struct Layer2 *l2); | |
107 | ||
108 | static void | |
109 | set_peer_busy(struct Layer2 *l2) { | |
110 | test_and_set_bit(FLG_PEER_BUSY, &l2->flag); | |
111 | if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue)) | |
112 | test_and_set_bit(FLG_L2BLOCK, &l2->flag); | |
113 | } | |
114 | ||
115 | static void | |
116 | clear_peer_busy(struct Layer2 *l2) { | |
117 | if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag)) | |
118 | test_and_clear_bit(FLG_L2BLOCK, &l2->flag); | |
119 | } | |
120 | ||
121 | static void | |
122 | InitWin(struct Layer2 *l2) | |
123 | { | |
124 | int i; | |
125 | ||
126 | for (i = 0; i < MAX_WINDOW; i++) | |
127 | l2->windowar[i] = NULL; | |
128 | } | |
129 | ||
130 | static int | |
131 | freewin1(struct Layer2 *l2) | |
132 | { | |
133 | int i, cnt = 0; | |
134 | ||
135 | for (i = 0; i < MAX_WINDOW; i++) { | |
136 | if (l2->windowar[i]) { | |
137 | cnt++; | |
138 | dev_kfree_skb(l2->windowar[i]); | |
139 | l2->windowar[i] = NULL; | |
140 | } | |
141 | } | |
142 | return cnt; | |
143 | } | |
144 | ||
145 | inline void | |
146 | freewin(struct PStack *st) | |
147 | { | |
148 | freewin1(&st->l2); | |
149 | } | |
150 | ||
151 | static void | |
152 | ReleaseWin(struct Layer2 *l2) | |
153 | { | |
154 | int cnt; | |
155 | ||
156 | if((cnt = freewin1(l2))) | |
157 | printk(KERN_WARNING "isdl2 freed %d skbuffs in release\n", cnt); | |
158 | } | |
159 | ||
160 | inline unsigned int | |
161 | cansend(struct PStack *st) | |
162 | { | |
163 | unsigned int p1; | |
164 | ||
165 | if(test_bit(FLG_MOD128, &st->l2.flag)) | |
166 | p1 = (st->l2.vs - st->l2.va) % 128; | |
167 | else | |
168 | p1 = (st->l2.vs - st->l2.va) % 8; | |
169 | return ((p1 < st->l2.window) && !test_bit(FLG_PEER_BUSY, &st->l2.flag)); | |
170 | } | |
171 | ||
172 | inline void | |
173 | clear_exception(struct Layer2 *l2) | |
174 | { | |
175 | test_and_clear_bit(FLG_ACK_PEND, &l2->flag); | |
176 | test_and_clear_bit(FLG_REJEXC, &l2->flag); | |
177 | test_and_clear_bit(FLG_OWN_BUSY, &l2->flag); | |
178 | clear_peer_busy(l2); | |
179 | } | |
180 | ||
181 | inline int | |
182 | l2headersize(struct Layer2 *l2, int ui) | |
183 | { | |
184 | return (((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) + | |
185 | (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1)); | |
186 | } | |
187 | ||
188 | inline int | |
189 | l2addrsize(struct Layer2 *l2) | |
190 | { | |
191 | return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1); | |
192 | } | |
193 | ||
194 | static int | |
195 | sethdraddr(struct Layer2 *l2, u_char * header, int rsp) | |
196 | { | |
197 | u_char *ptr = header; | |
198 | int crbit = rsp; | |
199 | ||
200 | if (test_bit(FLG_LAPD, &l2->flag)) { | |
201 | *ptr++ = (l2->sap << 2) | (rsp ? 2 : 0); | |
202 | *ptr++ = (l2->tei << 1) | 1; | |
203 | return (2); | |
204 | } else { | |
205 | if (test_bit(FLG_ORIG, &l2->flag)) | |
206 | crbit = !crbit; | |
207 | if (crbit) | |
208 | *ptr++ = 1; | |
209 | else | |
210 | *ptr++ = 3; | |
211 | return (1); | |
212 | } | |
213 | } | |
214 | ||
215 | inline static void | |
216 | enqueue_super(struct PStack *st, | |
217 | struct sk_buff *skb) | |
218 | { | |
219 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
220 | st->l1.bcs->tx_cnt += skb->len; | |
221 | st->l2.l2l1(st, PH_DATA | REQUEST, skb); | |
222 | } | |
223 | ||
224 | #define enqueue_ui(a, b) enqueue_super(a, b) | |
225 | ||
226 | inline int | |
227 | IsUI(u_char * data) | |
228 | { | |
229 | return ((data[0] & 0xef) == UI); | |
230 | } | |
231 | ||
232 | inline int | |
233 | IsUA(u_char * data) | |
234 | { | |
235 | return ((data[0] & 0xef) == UA); | |
236 | } | |
237 | ||
238 | inline int | |
239 | IsDM(u_char * data) | |
240 | { | |
241 | return ((data[0] & 0xef) == DM); | |
242 | } | |
243 | ||
244 | inline int | |
245 | IsDISC(u_char * data) | |
246 | { | |
247 | return ((data[0] & 0xef) == DISC); | |
248 | } | |
249 | ||
250 | inline int | |
251 | IsRR(u_char * data, struct PStack *st) | |
252 | { | |
253 | if (test_bit(FLG_MOD128, &st->l2.flag)) | |
254 | return (data[0] == RR); | |
255 | else | |
256 | return ((data[0] & 0xf) == 1); | |
257 | } | |
258 | ||
259 | inline int | |
260 | IsSFrame(u_char * data, struct PStack *st) | |
261 | { | |
262 | register u_char d = *data; | |
263 | ||
264 | if (!test_bit(FLG_MOD128, &st->l2.flag)) | |
265 | d &= 0xf; | |
266 | return(((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c)); | |
267 | } | |
268 | ||
269 | inline int | |
270 | IsSABME(u_char * data, struct PStack *st) | |
271 | { | |
272 | u_char d = data[0] & ~0x10; | |
273 | ||
274 | return (test_bit(FLG_MOD128, &st->l2.flag) ? d == SABME : d == SABM); | |
275 | } | |
276 | ||
277 | inline int | |
278 | IsREJ(u_char * data, struct PStack *st) | |
279 | { | |
280 | return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ); | |
281 | } | |
282 | ||
283 | inline int | |
284 | IsFRMR(u_char * data) | |
285 | { | |
286 | return ((data[0] & 0xef) == FRMR); | |
287 | } | |
288 | ||
289 | inline int | |
290 | IsRNR(u_char * data, struct PStack *st) | |
291 | { | |
292 | return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR); | |
293 | } | |
294 | ||
295 | int | |
296 | iframe_error(struct PStack *st, struct sk_buff *skb) | |
297 | { | |
298 | int i = l2addrsize(&st->l2) + (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1); | |
299 | int rsp = *skb->data & 0x2; | |
300 | ||
301 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
302 | rsp = !rsp; | |
303 | ||
304 | if (rsp) | |
305 | return 'L'; | |
306 | ||
307 | ||
308 | if (skb->len < i) | |
309 | return 'N'; | |
310 | ||
311 | if ((skb->len - i) > st->l2.maxlen) | |
312 | return 'O'; | |
313 | ||
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | int | |
319 | super_error(struct PStack *st, struct sk_buff *skb) | |
320 | { | |
321 | if (skb->len != l2addrsize(&st->l2) + | |
322 | (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1)) | |
323 | return 'N'; | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | int | |
329 | unnum_error(struct PStack *st, struct sk_buff *skb, int wantrsp) | |
330 | { | |
331 | int rsp = (*skb->data & 0x2) >> 1; | |
332 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
333 | rsp = !rsp; | |
334 | ||
335 | if (rsp != wantrsp) | |
336 | return 'L'; | |
337 | ||
338 | if (skb->len != l2addrsize(&st->l2) + 1) | |
339 | return 'N'; | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | int | |
345 | UI_error(struct PStack *st, struct sk_buff *skb) | |
346 | { | |
347 | int rsp = *skb->data & 0x2; | |
348 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
349 | rsp = !rsp; | |
350 | ||
351 | if (rsp) | |
352 | return 'L'; | |
353 | ||
354 | if (skb->len > st->l2.maxlen + l2addrsize(&st->l2) + 1) | |
355 | return 'O'; | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | int | |
361 | FRMR_error(struct PStack *st, struct sk_buff *skb) | |
362 | { | |
363 | int headers = l2addrsize(&st->l2) + 1; | |
364 | u_char *datap = skb->data + headers; | |
365 | int rsp = *skb->data & 0x2; | |
366 | ||
367 | if (test_bit(FLG_ORIG, &st->l2.flag)) | |
368 | rsp = !rsp; | |
369 | ||
370 | if (!rsp) | |
371 | return 'L'; | |
372 | ||
373 | if (test_bit(FLG_MOD128, &st->l2.flag)) { | |
374 | if (skb->len < headers + 5) | |
375 | return 'N'; | |
376 | else | |
377 | l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x %2x %2x", | |
378 | datap[0], datap[1], datap[2], | |
379 | datap[3], datap[4]); | |
380 | } else { | |
381 | if (skb->len < headers + 3) | |
382 | return 'N'; | |
383 | else | |
384 | l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x", | |
385 | datap[0], datap[1], datap[2]); | |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | static unsigned int | |
392 | legalnr(struct PStack *st, unsigned int nr) | |
393 | { | |
394 | struct Layer2 *l2 = &st->l2; | |
395 | ||
396 | if(test_bit(FLG_MOD128, &l2->flag)) | |
397 | return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128); | |
398 | else | |
399 | return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8); | |
400 | } | |
401 | ||
402 | static void | |
403 | setva(struct PStack *st, unsigned int nr) | |
404 | { | |
405 | struct Layer2 *l2 = &st->l2; | |
406 | int len; | |
407 | u_long flags; | |
408 | ||
409 | spin_lock_irqsave(&l2->lock, flags); | |
410 | while (l2->va != nr) { | |
411 | (l2->va)++; | |
412 | if(test_bit(FLG_MOD128, &l2->flag)) | |
413 | l2->va %= 128; | |
414 | else | |
415 | l2->va %= 8; | |
416 | len = l2->windowar[l2->sow]->len; | |
417 | if (PACKET_NOACK == l2->windowar[l2->sow]->pkt_type) | |
418 | len = -1; | |
419 | dev_kfree_skb(l2->windowar[l2->sow]); | |
420 | l2->windowar[l2->sow] = NULL; | |
421 | l2->sow = (l2->sow + 1) % l2->window; | |
422 | spin_unlock_irqrestore(&l2->lock, flags); | |
423 | if (test_bit(FLG_LLI_L2WAKEUP, &st->lli.flag) && (len >=0)) | |
424 | lli_writewakeup(st, len); | |
425 | spin_lock_irqsave(&l2->lock, flags); | |
426 | } | |
427 | spin_unlock_irqrestore(&l2->lock, flags); | |
428 | } | |
429 | ||
430 | static void | |
431 | send_uframe(struct PStack *st, u_char cmd, u_char cr) | |
432 | { | |
433 | struct sk_buff *skb; | |
434 | u_char tmp[MAX_HEADER_LEN]; | |
435 | int i; | |
436 | ||
437 | i = sethdraddr(&st->l2, tmp, cr); | |
438 | tmp[i++] = cmd; | |
439 | if (!(skb = alloc_skb(i, GFP_ATOMIC))) { | |
440 | printk(KERN_WARNING "isdl2 can't alloc sbbuff for send_uframe\n"); | |
441 | return; | |
442 | } | |
443 | memcpy(skb_put(skb, i), tmp, i); | |
444 | enqueue_super(st, skb); | |
445 | } | |
446 | ||
447 | inline u_char | |
448 | get_PollFlag(struct PStack * st, struct sk_buff * skb) | |
449 | { | |
450 | return (skb->data[l2addrsize(&(st->l2))] & 0x10); | |
451 | } | |
452 | ||
453 | inline void | |
454 | FreeSkb(struct sk_buff *skb) | |
455 | { | |
456 | dev_kfree_skb(skb); | |
457 | } | |
458 | ||
459 | ||
460 | inline u_char | |
461 | get_PollFlagFree(struct PStack *st, struct sk_buff *skb) | |
462 | { | |
463 | u_char PF; | |
464 | ||
465 | PF = get_PollFlag(st, skb); | |
466 | FreeSkb(skb); | |
467 | return (PF); | |
468 | } | |
469 | ||
470 | inline void | |
471 | start_t200(struct PStack *st, int i) | |
472 | { | |
473 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i); | |
474 | test_and_set_bit(FLG_T200_RUN, &st->l2.flag); | |
475 | } | |
476 | ||
477 | inline void | |
478 | restart_t200(struct PStack *st, int i) | |
479 | { | |
480 | FsmRestartTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i); | |
481 | test_and_set_bit(FLG_T200_RUN, &st->l2.flag); | |
482 | } | |
483 | ||
484 | inline void | |
485 | stop_t200(struct PStack *st, int i) | |
486 | { | |
487 | if(test_and_clear_bit(FLG_T200_RUN, &st->l2.flag)) | |
488 | FsmDelTimer(&st->l2.t200, i); | |
489 | } | |
490 | ||
491 | inline void | |
492 | st5_dl_release_l2l3(struct PStack *st) | |
493 | { | |
494 | int pr; | |
495 | ||
496 | if(test_and_clear_bit(FLG_PEND_REL, &st->l2.flag)) | |
497 | pr = DL_RELEASE | CONFIRM; | |
498 | else | |
499 | pr = DL_RELEASE | INDICATION; | |
500 | ||
501 | st->l2.l2l3(st, pr, NULL); | |
502 | } | |
503 | ||
504 | inline void | |
505 | lapb_dl_release_l2l3(struct PStack *st, int f) | |
506 | { | |
507 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
508 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
509 | st->l2.l2l3(st, DL_RELEASE | f, NULL); | |
510 | } | |
511 | ||
512 | static void | |
513 | establishlink(struct FsmInst *fi) | |
514 | { | |
515 | struct PStack *st = fi->userdata; | |
516 | u_char cmd; | |
517 | ||
518 | clear_exception(&st->l2); | |
519 | st->l2.rc = 0; | |
520 | cmd = (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | 0x10; | |
521 | send_uframe(st, cmd, CMD); | |
522 | FsmDelTimer(&st->l2.t203, 1); | |
523 | restart_t200(st, 1); | |
524 | test_and_clear_bit(FLG_PEND_REL, &st->l2.flag); | |
525 | freewin(st); | |
526 | FsmChangeState(fi, ST_L2_5); | |
527 | } | |
528 | ||
529 | static void | |
530 | l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg) | |
531 | { | |
532 | struct sk_buff *skb = arg; | |
533 | struct PStack *st = fi->userdata; | |
534 | ||
535 | if (get_PollFlagFree(st, skb)) | |
536 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'C'); | |
537 | else | |
538 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'D'); | |
539 | } | |
540 | ||
541 | static void | |
542 | l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg) | |
543 | { | |
544 | struct sk_buff *skb = arg; | |
545 | struct PStack *st = fi->userdata; | |
546 | ||
547 | if (get_PollFlagFree(st, skb)) | |
548 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B'); | |
549 | else { | |
550 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E'); | |
551 | establishlink(fi); | |
552 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
553 | } | |
554 | } | |
555 | ||
556 | static void | |
557 | l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg) | |
558 | { | |
559 | struct sk_buff *skb = arg; | |
560 | struct PStack *st = fi->userdata; | |
561 | ||
562 | if (get_PollFlagFree(st, skb)) | |
563 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B'); | |
564 | else { | |
565 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E'); | |
566 | } | |
567 | establishlink(fi); | |
568 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
569 | } | |
570 | ||
571 | static void | |
572 | l2_go_st3(struct FsmInst *fi, int event, void *arg) | |
573 | { | |
574 | FsmChangeState(fi, ST_L2_3); | |
575 | } | |
576 | ||
577 | static void | |
578 | l2_mdl_assign(struct FsmInst *fi, int event, void *arg) | |
579 | { | |
580 | struct PStack *st = fi->userdata; | |
581 | ||
582 | FsmChangeState(fi, ST_L2_3); | |
583 | st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL); | |
584 | } | |
585 | ||
586 | static void | |
587 | l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg) | |
588 | { | |
589 | struct PStack *st = fi->userdata; | |
590 | struct sk_buff *skb = arg; | |
591 | ||
592 | skb_queue_tail(&st->l2.ui_queue, skb); | |
593 | FsmChangeState(fi, ST_L2_2); | |
594 | st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL); | |
595 | } | |
596 | ||
597 | static void | |
598 | l2_queue_ui(struct FsmInst *fi, int event, void *arg) | |
599 | { | |
600 | struct PStack *st = fi->userdata; | |
601 | struct sk_buff *skb = arg; | |
602 | ||
603 | skb_queue_tail(&st->l2.ui_queue, skb); | |
604 | } | |
605 | ||
606 | static void | |
607 | tx_ui(struct PStack *st) | |
608 | { | |
609 | struct sk_buff *skb; | |
610 | u_char header[MAX_HEADER_LEN]; | |
611 | int i; | |
612 | ||
613 | i = sethdraddr(&(st->l2), header, CMD); | |
614 | header[i++] = UI; | |
615 | while ((skb = skb_dequeue(&st->l2.ui_queue))) { | |
616 | memcpy(skb_push(skb, i), header, i); | |
617 | enqueue_ui(st, skb); | |
618 | } | |
619 | } | |
620 | ||
621 | static void | |
622 | l2_send_ui(struct FsmInst *fi, int event, void *arg) | |
623 | { | |
624 | struct PStack *st = fi->userdata; | |
625 | struct sk_buff *skb = arg; | |
626 | ||
627 | skb_queue_tail(&st->l2.ui_queue, skb); | |
628 | tx_ui(st); | |
629 | } | |
630 | ||
631 | static void | |
632 | l2_got_ui(struct FsmInst *fi, int event, void *arg) | |
633 | { | |
634 | struct PStack *st = fi->userdata; | |
635 | struct sk_buff *skb = arg; | |
636 | ||
637 | skb_pull(skb, l2headersize(&st->l2, 1)); | |
638 | st->l2.l2l3(st, DL_UNIT_DATA | INDICATION, skb); | |
639 | /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | |
640 | * in states 1-3 for broadcast | |
641 | */ | |
642 | ||
643 | ||
644 | } | |
645 | ||
646 | static void | |
647 | l2_establish(struct FsmInst *fi, int event, void *arg) | |
648 | { | |
649 | struct PStack *st = fi->userdata; | |
650 | ||
651 | establishlink(fi); | |
652 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
653 | } | |
654 | ||
655 | static void | |
656 | l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg) | |
657 | { | |
658 | struct PStack *st = fi->userdata; | |
659 | ||
660 | skb_queue_purge(&st->l2.i_queue); | |
661 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
662 | test_and_clear_bit(FLG_PEND_REL, &st->l2.flag); | |
663 | } | |
664 | ||
665 | static void | |
666 | l2_l3_reestablish(struct FsmInst *fi, int event, void *arg) | |
667 | { | |
668 | struct PStack *st = fi->userdata; | |
669 | ||
670 | skb_queue_purge(&st->l2.i_queue); | |
671 | establishlink(fi); | |
672 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
673 | } | |
674 | ||
675 | static void | |
676 | l2_release(struct FsmInst *fi, int event, void *arg) | |
677 | { | |
678 | struct PStack *st = fi->userdata; | |
679 | ||
680 | st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL); | |
681 | } | |
682 | ||
683 | static void | |
684 | l2_pend_rel(struct FsmInst *fi, int event, void *arg) | |
685 | { | |
686 | struct PStack *st = fi->userdata; | |
687 | ||
688 | test_and_set_bit(FLG_PEND_REL, &st->l2.flag); | |
689 | } | |
690 | ||
691 | static void | |
692 | l2_disconnect(struct FsmInst *fi, int event, void *arg) | |
693 | { | |
694 | struct PStack *st = fi->userdata; | |
695 | ||
696 | skb_queue_purge(&st->l2.i_queue); | |
697 | freewin(st); | |
698 | FsmChangeState(fi, ST_L2_6); | |
699 | st->l2.rc = 0; | |
700 | send_uframe(st, DISC | 0x10, CMD); | |
701 | FsmDelTimer(&st->l2.t203, 1); | |
702 | restart_t200(st, 2); | |
703 | } | |
704 | ||
705 | static void | |
706 | l2_start_multi(struct FsmInst *fi, int event, void *arg) | |
707 | { | |
708 | struct PStack *st = fi->userdata; | |
709 | struct sk_buff *skb = arg; | |
710 | ||
711 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
712 | ||
713 | clear_exception(&st->l2); | |
714 | st->l2.vs = 0; | |
715 | st->l2.va = 0; | |
716 | st->l2.vr = 0; | |
717 | st->l2.sow = 0; | |
718 | FsmChangeState(fi, ST_L2_7); | |
719 | FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3); | |
720 | ||
721 | st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL); | |
722 | } | |
723 | ||
724 | static void | |
725 | l2_send_UA(struct FsmInst *fi, int event, void *arg) | |
726 | { | |
727 | struct PStack *st = fi->userdata; | |
728 | struct sk_buff *skb = arg; | |
729 | ||
730 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
731 | } | |
732 | ||
733 | static void | |
734 | l2_send_DM(struct FsmInst *fi, int event, void *arg) | |
735 | { | |
736 | struct PStack *st = fi->userdata; | |
737 | struct sk_buff *skb = arg; | |
738 | ||
739 | send_uframe(st, DM | get_PollFlagFree(st, skb), RSP); | |
740 | } | |
741 | ||
742 | static void | |
743 | l2_restart_multi(struct FsmInst *fi, int event, void *arg) | |
744 | { | |
745 | struct PStack *st = fi->userdata; | |
746 | struct sk_buff *skb = arg; | |
747 | int est = 0, state; | |
748 | ||
749 | state = fi->state; | |
750 | ||
751 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
752 | ||
753 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'F'); | |
754 | ||
755 | if (st->l2.vs != st->l2.va) { | |
756 | skb_queue_purge(&st->l2.i_queue); | |
757 | est = 1; | |
758 | } | |
759 | ||
760 | clear_exception(&st->l2); | |
761 | st->l2.vs = 0; | |
762 | st->l2.va = 0; | |
763 | st->l2.vr = 0; | |
764 | st->l2.sow = 0; | |
765 | FsmChangeState(fi, ST_L2_7); | |
766 | stop_t200(st, 3); | |
767 | FsmRestartTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3); | |
768 | ||
769 | if (est) | |
770 | st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL); | |
771 | ||
772 | if ((ST_L2_7==state) || (ST_L2_8 == state)) | |
773 | if (skb_queue_len(&st->l2.i_queue) && cansend(st)) | |
774 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
775 | } | |
776 | ||
777 | static void | |
778 | l2_stop_multi(struct FsmInst *fi, int event, void *arg) | |
779 | { | |
780 | struct PStack *st = fi->userdata; | |
781 | struct sk_buff *skb = arg; | |
782 | ||
783 | FsmChangeState(fi, ST_L2_4); | |
784 | FsmDelTimer(&st->l2.t203, 3); | |
785 | stop_t200(st, 4); | |
786 | ||
787 | send_uframe(st, UA | get_PollFlagFree(st, skb), RSP); | |
788 | ||
789 | skb_queue_purge(&st->l2.i_queue); | |
790 | freewin(st); | |
791 | lapb_dl_release_l2l3(st, INDICATION); | |
792 | } | |
793 | ||
794 | static void | |
795 | l2_connected(struct FsmInst *fi, int event, void *arg) | |
796 | { | |
797 | struct PStack *st = fi->userdata; | |
798 | struct sk_buff *skb = arg; | |
799 | int pr=-1; | |
800 | ||
801 | if (!get_PollFlag(st, skb)) { | |
802 | l2_mdl_error_ua(fi, event, arg); | |
803 | return; | |
804 | } | |
805 | FreeSkb(skb); | |
806 | ||
807 | if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag)) | |
808 | l2_disconnect(fi, event, arg); | |
809 | ||
810 | if (test_and_clear_bit(FLG_L3_INIT, &st->l2.flag)) { | |
811 | pr = DL_ESTABLISH | CONFIRM; | |
812 | } else if (st->l2.vs != st->l2.va) { | |
813 | skb_queue_purge(&st->l2.i_queue); | |
814 | pr = DL_ESTABLISH | INDICATION; | |
815 | } | |
816 | ||
817 | stop_t200(st, 5); | |
818 | ||
819 | st->l2.vr = 0; | |
820 | st->l2.vs = 0; | |
821 | st->l2.va = 0; | |
822 | st->l2.sow = 0; | |
823 | FsmChangeState(fi, ST_L2_7); | |
824 | FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 4); | |
825 | ||
826 | if (pr != -1) | |
827 | st->l2.l2l3(st, pr, NULL); | |
828 | ||
829 | if (skb_queue_len(&st->l2.i_queue) && cansend(st)) | |
830 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
831 | } | |
832 | ||
833 | static void | |
834 | l2_released(struct FsmInst *fi, int event, void *arg) | |
835 | { | |
836 | struct PStack *st = fi->userdata; | |
837 | struct sk_buff *skb = arg; | |
838 | ||
839 | if (!get_PollFlag(st, skb)) { | |
840 | l2_mdl_error_ua(fi, event, arg); | |
841 | return; | |
842 | } | |
843 | FreeSkb(skb); | |
844 | ||
845 | stop_t200(st, 6); | |
846 | lapb_dl_release_l2l3(st, CONFIRM); | |
847 | FsmChangeState(fi, ST_L2_4); | |
848 | } | |
849 | ||
850 | static void | |
851 | l2_reestablish(struct FsmInst *fi, int event, void *arg) | |
852 | { | |
853 | struct PStack *st = fi->userdata; | |
854 | struct sk_buff *skb = arg; | |
855 | ||
856 | if (!get_PollFlagFree(st, skb)) { | |
857 | establishlink(fi); | |
858 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
859 | } | |
860 | } | |
861 | ||
862 | static void | |
863 | l2_st5_dm_release(struct FsmInst *fi, int event, void *arg) | |
864 | { | |
865 | struct PStack *st = fi->userdata; | |
866 | struct sk_buff *skb = arg; | |
867 | ||
868 | if (get_PollFlagFree(st, skb)) { | |
869 | stop_t200(st, 7); | |
870 | if (!test_bit(FLG_L3_INIT, &st->l2.flag)) | |
871 | skb_queue_purge(&st->l2.i_queue); | |
872 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
873 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
874 | st5_dl_release_l2l3(st); | |
875 | FsmChangeState(fi, ST_L2_4); | |
876 | } | |
877 | } | |
878 | ||
879 | static void | |
880 | l2_st6_dm_release(struct FsmInst *fi, int event, void *arg) | |
881 | { | |
882 | struct PStack *st = fi->userdata; | |
883 | struct sk_buff *skb = arg; | |
884 | ||
885 | if (get_PollFlagFree(st, skb)) { | |
886 | stop_t200(st, 8); | |
887 | lapb_dl_release_l2l3(st, CONFIRM); | |
888 | FsmChangeState(fi, ST_L2_4); | |
889 | } | |
890 | } | |
891 | ||
892 | inline void | |
893 | enquiry_cr(struct PStack *st, u_char typ, u_char cr, u_char pf) | |
894 | { | |
895 | struct sk_buff *skb; | |
896 | struct Layer2 *l2; | |
897 | u_char tmp[MAX_HEADER_LEN]; | |
898 | int i; | |
899 | ||
900 | l2 = &st->l2; | |
901 | i = sethdraddr(l2, tmp, cr); | |
902 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
903 | tmp[i++] = typ; | |
904 | tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0); | |
905 | } else | |
906 | tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0); | |
907 | if (!(skb = alloc_skb(i, GFP_ATOMIC))) { | |
908 | printk(KERN_WARNING "isdl2 can't alloc sbbuff for enquiry_cr\n"); | |
909 | return; | |
910 | } | |
911 | memcpy(skb_put(skb, i), tmp, i); | |
912 | enqueue_super(st, skb); | |
913 | } | |
914 | ||
915 | inline void | |
916 | enquiry_response(struct PStack *st) | |
917 | { | |
918 | if (test_bit(FLG_OWN_BUSY, &st->l2.flag)) | |
919 | enquiry_cr(st, RNR, RSP, 1); | |
920 | else | |
921 | enquiry_cr(st, RR, RSP, 1); | |
922 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
923 | } | |
924 | ||
925 | inline void | |
926 | transmit_enquiry(struct PStack *st) | |
927 | { | |
928 | if (test_bit(FLG_OWN_BUSY, &st->l2.flag)) | |
929 | enquiry_cr(st, RNR, CMD, 1); | |
930 | else | |
931 | enquiry_cr(st, RR, CMD, 1); | |
932 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
933 | start_t200(st, 9); | |
934 | } | |
935 | ||
936 | ||
937 | static void | |
938 | nrerrorrecovery(struct FsmInst *fi) | |
939 | { | |
940 | struct PStack *st = fi->userdata; | |
941 | ||
942 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'J'); | |
943 | establishlink(fi); | |
944 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
945 | } | |
946 | ||
947 | static void | |
948 | invoke_retransmission(struct PStack *st, unsigned int nr) | |
949 | { | |
950 | struct Layer2 *l2 = &st->l2; | |
951 | u_int p1; | |
952 | u_long flags; | |
953 | ||
954 | spin_lock_irqsave(&l2->lock, flags); | |
955 | if (l2->vs != nr) { | |
956 | while (l2->vs != nr) { | |
957 | (l2->vs)--; | |
958 | if(test_bit(FLG_MOD128, &l2->flag)) { | |
959 | l2->vs %= 128; | |
960 | p1 = (l2->vs - l2->va) % 128; | |
961 | } else { | |
962 | l2->vs %= 8; | |
963 | p1 = (l2->vs - l2->va) % 8; | |
964 | } | |
965 | p1 = (p1 + l2->sow) % l2->window; | |
966 | if (test_bit(FLG_LAPB, &l2->flag)) | |
967 | st->l1.bcs->tx_cnt += l2->windowar[p1]->len + l2headersize(l2, 0); | |
968 | skb_queue_head(&l2->i_queue, l2->windowar[p1]); | |
969 | l2->windowar[p1] = NULL; | |
970 | } | |
971 | spin_unlock_irqrestore(&l2->lock, flags); | |
972 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
973 | return; | |
974 | } | |
975 | spin_unlock_irqrestore(&l2->lock, flags); | |
976 | } | |
977 | ||
978 | static void | |
979 | l2_st7_got_super(struct FsmInst *fi, int event, void *arg) | |
980 | { | |
981 | struct PStack *st = fi->userdata; | |
982 | struct sk_buff *skb = arg; | |
983 | int PollFlag, rsp, typ = RR; | |
984 | unsigned int nr; | |
985 | struct Layer2 *l2 = &st->l2; | |
986 | ||
987 | rsp = *skb->data & 0x2; | |
988 | if (test_bit(FLG_ORIG, &l2->flag)) | |
989 | rsp = !rsp; | |
990 | ||
991 | skb_pull(skb, l2addrsize(l2)); | |
992 | if (IsRNR(skb->data, st)) { | |
993 | set_peer_busy(l2); | |
994 | typ = RNR; | |
995 | } else | |
996 | clear_peer_busy(l2); | |
997 | if (IsREJ(skb->data, st)) | |
998 | typ = REJ; | |
999 | ||
1000 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
1001 | PollFlag = (skb->data[1] & 0x1) == 0x1; | |
1002 | nr = skb->data[1] >> 1; | |
1003 | } else { | |
1004 | PollFlag = (skb->data[0] & 0x10); | |
1005 | nr = (skb->data[0] >> 5) & 0x7; | |
1006 | } | |
1007 | FreeSkb(skb); | |
1008 | ||
1009 | if (PollFlag) { | |
1010 | if (rsp) | |
1011 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'A'); | |
1012 | else | |
1013 | enquiry_response(st); | |
1014 | } | |
1015 | if (legalnr(st, nr)) { | |
1016 | if (typ == REJ) { | |
1017 | setva(st, nr); | |
1018 | invoke_retransmission(st, nr); | |
1019 | stop_t200(st, 10); | |
1020 | if (FsmAddTimer(&st->l2.t203, st->l2.T203, | |
1021 | EV_L2_T203, NULL, 6)) | |
1022 | l2m_debug(&st->l2.l2m, "Restart T203 ST7 REJ"); | |
1023 | } else if ((nr == l2->vs) && (typ == RR)) { | |
1024 | setva(st, nr); | |
1025 | stop_t200(st, 11); | |
1026 | FsmRestartTimer(&st->l2.t203, st->l2.T203, | |
1027 | EV_L2_T203, NULL, 7); | |
1028 | } else if ((l2->va != nr) || (typ == RNR)) { | |
1029 | setva(st, nr); | |
1030 | if(typ != RR) FsmDelTimer(&st->l2.t203, 9); | |
1031 | restart_t200(st, 12); | |
1032 | } | |
1033 | if (skb_queue_len(&st->l2.i_queue) && (typ == RR)) | |
1034 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
1035 | } else | |
1036 | nrerrorrecovery(fi); | |
1037 | } | |
1038 | ||
1039 | static void | |
1040 | l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg) | |
1041 | { | |
1042 | struct PStack *st = fi->userdata; | |
1043 | struct sk_buff *skb = arg; | |
1044 | ||
1045 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1046 | st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0); | |
1047 | if (!test_bit(FLG_L3_INIT, &st->l2.flag)) | |
1048 | skb_queue_tail(&st->l2.i_queue, skb); | |
1049 | else | |
1050 | FreeSkb(skb); | |
1051 | } | |
1052 | ||
1053 | static void | |
1054 | l2_feed_i_pull(struct FsmInst *fi, int event, void *arg) | |
1055 | { | |
1056 | struct PStack *st = fi->userdata; | |
1057 | struct sk_buff *skb = arg; | |
1058 | ||
1059 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1060 | st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0); | |
1061 | skb_queue_tail(&st->l2.i_queue, skb); | |
1062 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
1063 | } | |
1064 | ||
1065 | static void | |
1066 | l2_feed_iqueue(struct FsmInst *fi, int event, void *arg) | |
1067 | { | |
1068 | struct PStack *st = fi->userdata; | |
1069 | struct sk_buff *skb = arg; | |
1070 | ||
1071 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1072 | st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0); | |
1073 | skb_queue_tail(&st->l2.i_queue, skb); | |
1074 | } | |
1075 | ||
1076 | static void | |
1077 | l2_got_iframe(struct FsmInst *fi, int event, void *arg) | |
1078 | { | |
1079 | struct PStack *st = fi->userdata; | |
1080 | struct sk_buff *skb = arg; | |
1081 | struct Layer2 *l2 = &(st->l2); | |
1082 | int PollFlag, ns, i; | |
1083 | unsigned int nr; | |
1084 | ||
1085 | i = l2addrsize(l2); | |
1086 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
1087 | PollFlag = ((skb->data[i + 1] & 0x1) == 0x1); | |
1088 | ns = skb->data[i] >> 1; | |
1089 | nr = (skb->data[i + 1] >> 1) & 0x7f; | |
1090 | } else { | |
1091 | PollFlag = (skb->data[i] & 0x10); | |
1092 | ns = (skb->data[i] >> 1) & 0x7; | |
1093 | nr = (skb->data[i] >> 5) & 0x7; | |
1094 | } | |
1095 | if (test_bit(FLG_OWN_BUSY, &l2->flag)) { | |
1096 | FreeSkb(skb); | |
1097 | if(PollFlag) enquiry_response(st); | |
1098 | } else if (l2->vr == ns) { | |
1099 | (l2->vr)++; | |
1100 | if(test_bit(FLG_MOD128, &l2->flag)) | |
1101 | l2->vr %= 128; | |
1102 | else | |
1103 | l2->vr %= 8; | |
1104 | test_and_clear_bit(FLG_REJEXC, &l2->flag); | |
1105 | ||
1106 | if (PollFlag) | |
1107 | enquiry_response(st); | |
1108 | else | |
1109 | test_and_set_bit(FLG_ACK_PEND, &l2->flag); | |
1110 | skb_pull(skb, l2headersize(l2, 0)); | |
1111 | st->l2.l2l3(st, DL_DATA | INDICATION, skb); | |
1112 | } else { | |
1113 | /* n(s)!=v(r) */ | |
1114 | FreeSkb(skb); | |
1115 | if (test_and_set_bit(FLG_REJEXC, &l2->flag)) { | |
1116 | if (PollFlag) | |
1117 | enquiry_response(st); | |
1118 | } else { | |
1119 | enquiry_cr(st, REJ, RSP, PollFlag); | |
1120 | test_and_clear_bit(FLG_ACK_PEND, &l2->flag); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | if (legalnr(st, nr)) { | |
1125 | if (!test_bit(FLG_PEER_BUSY, &st->l2.flag) && (fi->state == ST_L2_7)) { | |
1126 | if (nr == st->l2.vs) { | |
1127 | stop_t200(st, 13); | |
1128 | FsmRestartTimer(&st->l2.t203, st->l2.T203, | |
1129 | EV_L2_T203, NULL, 7); | |
1130 | } else if (nr != st->l2.va) | |
1131 | restart_t200(st, 14); | |
1132 | } | |
1133 | setva(st, nr); | |
1134 | } else { | |
1135 | nrerrorrecovery(fi); | |
1136 | return; | |
1137 | } | |
1138 | ||
1139 | if (skb_queue_len(&st->l2.i_queue) && (fi->state == ST_L2_7)) | |
1140 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
1141 | if (test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag)) | |
1142 | enquiry_cr(st, RR, RSP, 0); | |
1143 | } | |
1144 | ||
1145 | static void | |
1146 | l2_got_tei(struct FsmInst *fi, int event, void *arg) | |
1147 | { | |
1148 | struct PStack *st = fi->userdata; | |
1149 | ||
1150 | st->l2.tei = (long) arg; | |
1151 | ||
1152 | if (fi->state == ST_L2_3) { | |
1153 | establishlink(fi); | |
1154 | test_and_set_bit(FLG_L3_INIT, &st->l2.flag); | |
1155 | } else | |
1156 | FsmChangeState(fi, ST_L2_4); | |
1157 | if (skb_queue_len(&st->l2.ui_queue)) | |
1158 | tx_ui(st); | |
1159 | } | |
1160 | ||
1161 | static void | |
1162 | l2_st5_tout_200(struct FsmInst *fi, int event, void *arg) | |
1163 | { | |
1164 | struct PStack *st = fi->userdata; | |
1165 | ||
1166 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
1167 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { | |
1168 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); | |
1169 | } else if (st->l2.rc == st->l2.N200) { | |
1170 | FsmChangeState(fi, ST_L2_4); | |
1171 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1172 | skb_queue_purge(&st->l2.i_queue); | |
1173 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'G'); | |
1174 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1175 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
1176 | st5_dl_release_l2l3(st); | |
1177 | } else { | |
1178 | st->l2.rc++; | |
1179 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); | |
1180 | send_uframe(st, (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | |
1181 | | 0x10, CMD); | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | static void | |
1186 | l2_st6_tout_200(struct FsmInst *fi, int event, void *arg) | |
1187 | { | |
1188 | struct PStack *st = fi->userdata; | |
1189 | ||
1190 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
1191 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { | |
1192 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); | |
1193 | } else if (st->l2.rc == st->l2.N200) { | |
1194 | FsmChangeState(fi, ST_L2_4); | |
1195 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1196 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'H'); | |
1197 | lapb_dl_release_l2l3(st, CONFIRM); | |
1198 | } else { | |
1199 | st->l2.rc++; | |
1200 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, | |
1201 | NULL, 9); | |
1202 | send_uframe(st, DISC | 0x10, CMD); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | static void | |
1207 | l2_st7_tout_200(struct FsmInst *fi, int event, void *arg) | |
1208 | { | |
1209 | struct PStack *st = fi->userdata; | |
1210 | ||
1211 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
1212 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { | |
1213 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); | |
1214 | return; | |
1215 | } | |
1216 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1217 | st->l2.rc = 0; | |
1218 | FsmChangeState(fi, ST_L2_8); | |
1219 | ||
1220 | transmit_enquiry(st); | |
1221 | st->l2.rc++; | |
1222 | } | |
1223 | ||
1224 | static void | |
1225 | l2_st8_tout_200(struct FsmInst *fi, int event, void *arg) | |
1226 | { | |
1227 | struct PStack *st = fi->userdata; | |
1228 | ||
1229 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
1230 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { | |
1231 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9); | |
1232 | return; | |
1233 | } | |
1234 | test_and_clear_bit(FLG_T200_RUN, &st->l2.flag); | |
1235 | if (st->l2.rc == st->l2.N200) { | |
1236 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'I'); | |
1237 | establishlink(fi); | |
1238 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
1239 | } else { | |
1240 | transmit_enquiry(st); | |
1241 | st->l2.rc++; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | static void | |
1246 | l2_st7_tout_203(struct FsmInst *fi, int event, void *arg) | |
1247 | { | |
1248 | struct PStack *st = fi->userdata; | |
1249 | ||
1250 | if (test_bit(FLG_LAPD, &st->l2.flag) && | |
1251 | test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) { | |
1252 | FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 9); | |
1253 | return; | |
1254 | } | |
1255 | FsmChangeState(fi, ST_L2_8); | |
1256 | transmit_enquiry(st); | |
1257 | st->l2.rc = 0; | |
1258 | } | |
1259 | ||
1260 | static void | |
1261 | l2_pull_iqueue(struct FsmInst *fi, int event, void *arg) | |
1262 | { | |
1263 | struct PStack *st = fi->userdata; | |
1264 | struct sk_buff *skb, *oskb; | |
1265 | struct Layer2 *l2 = &st->l2; | |
1266 | u_char header[MAX_HEADER_LEN]; | |
1267 | int i; | |
1268 | int unsigned p1; | |
1269 | u_long flags; | |
1270 | ||
1271 | if (!cansend(st)) | |
1272 | return; | |
1273 | ||
1274 | skb = skb_dequeue(&l2->i_queue); | |
1275 | if (!skb) | |
1276 | return; | |
1277 | ||
1278 | spin_lock_irqsave(&l2->lock, flags); | |
1279 | if(test_bit(FLG_MOD128, &l2->flag)) | |
1280 | p1 = (l2->vs - l2->va) % 128; | |
1281 | else | |
1282 | p1 = (l2->vs - l2->va) % 8; | |
1283 | p1 = (p1 + l2->sow) % l2->window; | |
1284 | if (l2->windowar[p1]) { | |
1285 | printk(KERN_WARNING "isdnl2 try overwrite ack queue entry %d\n", | |
1286 | p1); | |
1287 | dev_kfree_skb(l2->windowar[p1]); | |
1288 | } | |
1289 | l2->windowar[p1] = skb_clone(skb, GFP_ATOMIC); | |
1290 | ||
1291 | i = sethdraddr(&st->l2, header, CMD); | |
1292 | ||
1293 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
1294 | header[i++] = l2->vs << 1; | |
1295 | header[i++] = l2->vr << 1; | |
1296 | l2->vs = (l2->vs + 1) % 128; | |
1297 | } else { | |
1298 | header[i++] = (l2->vr << 5) | (l2->vs << 1); | |
1299 | l2->vs = (l2->vs + 1) % 8; | |
1300 | } | |
1301 | spin_unlock_irqrestore(&l2->lock, flags); | |
1302 | p1 = skb->data - skb->head; | |
1303 | if (p1 >= i) | |
1304 | memcpy(skb_push(skb, i), header, i); | |
1305 | else { | |
1306 | printk(KERN_WARNING | |
1307 | "isdl2 pull_iqueue skb header(%d/%d) too short\n", i, p1); | |
1308 | oskb = skb; | |
1309 | skb = alloc_skb(oskb->len + i, GFP_ATOMIC); | |
1310 | memcpy(skb_put(skb, i), header, i); | |
1311 | memcpy(skb_put(skb, oskb->len), oskb->data, oskb->len); | |
1312 | FreeSkb(oskb); | |
1313 | } | |
1314 | st->l2.l2l1(st, PH_PULL | INDICATION, skb); | |
1315 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
1316 | if (!test_and_set_bit(FLG_T200_RUN, &st->l2.flag)) { | |
1317 | FsmDelTimer(&st->l2.t203, 13); | |
1318 | FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11); | |
1319 | } | |
1320 | if (skb_queue_len(&l2->i_queue) && cansend(st)) | |
1321 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
1322 | } | |
1323 | ||
1324 | static void | |
1325 | l2_st8_got_super(struct FsmInst *fi, int event, void *arg) | |
1326 | { | |
1327 | struct PStack *st = fi->userdata; | |
1328 | struct sk_buff *skb = arg; | |
1329 | int PollFlag, rsp, rnr = 0; | |
1330 | unsigned int nr; | |
1331 | struct Layer2 *l2 = &st->l2; | |
1332 | ||
1333 | rsp = *skb->data & 0x2; | |
1334 | if (test_bit(FLG_ORIG, &l2->flag)) | |
1335 | rsp = !rsp; | |
1336 | ||
1337 | skb_pull(skb, l2addrsize(l2)); | |
1338 | ||
1339 | if (IsRNR(skb->data, st)) { | |
1340 | set_peer_busy(l2); | |
1341 | rnr = 1; | |
1342 | } else | |
1343 | clear_peer_busy(l2); | |
1344 | ||
1345 | if (test_bit(FLG_MOD128, &l2->flag)) { | |
1346 | PollFlag = (skb->data[1] & 0x1) == 0x1; | |
1347 | nr = skb->data[1] >> 1; | |
1348 | } else { | |
1349 | PollFlag = (skb->data[0] & 0x10); | |
1350 | nr = (skb->data[0] >> 5) & 0x7; | |
1351 | } | |
1352 | FreeSkb(skb); | |
1353 | ||
1354 | if (rsp && PollFlag) { | |
1355 | if (legalnr(st, nr)) { | |
1356 | if (rnr) { | |
1357 | restart_t200(st, 15); | |
1358 | } else { | |
1359 | stop_t200(st, 16); | |
1360 | FsmAddTimer(&l2->t203, l2->T203, | |
1361 | EV_L2_T203, NULL, 5); | |
1362 | setva(st, nr); | |
1363 | } | |
1364 | invoke_retransmission(st, nr); | |
1365 | FsmChangeState(fi, ST_L2_7); | |
1366 | if (skb_queue_len(&l2->i_queue) && cansend(st)) | |
1367 | st->l2.l2l1(st, PH_PULL | REQUEST, NULL); | |
1368 | } else | |
1369 | nrerrorrecovery(fi); | |
1370 | } else { | |
1371 | if (!rsp && PollFlag) | |
1372 | enquiry_response(st); | |
1373 | if (legalnr(st, nr)) { | |
1374 | setva(st, nr); | |
1375 | } else | |
1376 | nrerrorrecovery(fi); | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | static void | |
1381 | l2_got_FRMR(struct FsmInst *fi, int event, void *arg) | |
1382 | { | |
1383 | struct PStack *st = fi->userdata; | |
1384 | struct sk_buff *skb = arg; | |
1385 | ||
1386 | skb_pull(skb, l2addrsize(&st->l2) + 1); | |
1387 | ||
1388 | if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */ | |
1389 | (IsUA(skb->data) && (fi->state == ST_L2_7))) { | |
1390 | st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'K'); | |
1391 | establishlink(fi); | |
1392 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
1393 | } | |
1394 | FreeSkb(skb); | |
1395 | } | |
1396 | ||
1397 | static void | |
1398 | l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1399 | { | |
1400 | struct PStack *st = fi->userdata; | |
1401 | ||
1402 | skb_queue_purge(&st->l2.ui_queue); | |
1403 | st->l2.tei = -1; | |
1404 | FsmChangeState(fi, ST_L2_1); | |
1405 | } | |
1406 | ||
1407 | static void | |
1408 | l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1409 | { | |
1410 | struct PStack *st = fi->userdata; | |
1411 | ||
1412 | skb_queue_purge(&st->l2.ui_queue); | |
1413 | st->l2.tei = -1; | |
1414 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1415 | FsmChangeState(fi, ST_L2_1); | |
1416 | } | |
1417 | ||
1418 | static void | |
1419 | l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1420 | { | |
1421 | struct PStack *st = fi->userdata; | |
1422 | ||
1423 | skb_queue_purge(&st->l2.i_queue); | |
1424 | skb_queue_purge(&st->l2.ui_queue); | |
1425 | freewin(st); | |
1426 | st->l2.tei = -1; | |
1427 | stop_t200(st, 17); | |
1428 | st5_dl_release_l2l3(st); | |
1429 | FsmChangeState(fi, ST_L2_1); | |
1430 | } | |
1431 | ||
1432 | static void | |
1433 | l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1434 | { | |
1435 | struct PStack *st = fi->userdata; | |
1436 | ||
1437 | skb_queue_purge(&st->l2.ui_queue); | |
1438 | st->l2.tei = -1; | |
1439 | stop_t200(st, 18); | |
1440 | st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL); | |
1441 | FsmChangeState(fi, ST_L2_1); | |
1442 | } | |
1443 | ||
1444 | static void | |
1445 | l2_tei_remove(struct FsmInst *fi, int event, void *arg) | |
1446 | { | |
1447 | struct PStack *st = fi->userdata; | |
1448 | ||
1449 | skb_queue_purge(&st->l2.i_queue); | |
1450 | skb_queue_purge(&st->l2.ui_queue); | |
1451 | freewin(st); | |
1452 | st->l2.tei = -1; | |
1453 | stop_t200(st, 17); | |
1454 | FsmDelTimer(&st->l2.t203, 19); | |
1455 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1456 | FsmChangeState(fi, ST_L2_1); | |
1457 | } | |
1458 | ||
1459 | static void | |
1460 | l2_st14_persistant_da(struct FsmInst *fi, int event, void *arg) | |
1461 | { | |
1462 | struct PStack *st = fi->userdata; | |
1463 | ||
1464 | skb_queue_purge(&st->l2.i_queue); | |
1465 | skb_queue_purge(&st->l2.ui_queue); | |
1466 | if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag)) | |
1467 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1468 | } | |
1469 | ||
1470 | static void | |
1471 | l2_st5_persistant_da(struct FsmInst *fi, int event, void *arg) | |
1472 | { | |
1473 | struct PStack *st = fi->userdata; | |
1474 | ||
1475 | skb_queue_purge(&st->l2.i_queue); | |
1476 | skb_queue_purge(&st->l2.ui_queue); | |
1477 | freewin(st); | |
1478 | stop_t200(st, 19); | |
1479 | st5_dl_release_l2l3(st); | |
1480 | FsmChangeState(fi, ST_L2_4); | |
1481 | } | |
1482 | ||
1483 | static void | |
1484 | l2_st6_persistant_da(struct FsmInst *fi, int event, void *arg) | |
1485 | { | |
1486 | struct PStack *st = fi->userdata; | |
1487 | ||
1488 | skb_queue_purge(&st->l2.ui_queue); | |
1489 | stop_t200(st, 20); | |
1490 | st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL); | |
1491 | FsmChangeState(fi, ST_L2_4); | |
1492 | } | |
1493 | ||
1494 | static void | |
1495 | l2_persistant_da(struct FsmInst *fi, int event, void *arg) | |
1496 | { | |
1497 | struct PStack *st = fi->userdata; | |
1498 | ||
1499 | skb_queue_purge(&st->l2.i_queue); | |
1500 | skb_queue_purge(&st->l2.ui_queue); | |
1501 | freewin(st); | |
1502 | stop_t200(st, 19); | |
1503 | FsmDelTimer(&st->l2.t203, 19); | |
1504 | st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL); | |
1505 | FsmChangeState(fi, ST_L2_4); | |
1506 | } | |
1507 | ||
1508 | static void | |
1509 | l2_set_own_busy(struct FsmInst *fi, int event, void *arg) | |
1510 | { | |
1511 | struct PStack *st = fi->userdata; | |
1512 | ||
1513 | if(!test_and_set_bit(FLG_OWN_BUSY, &st->l2.flag)) { | |
1514 | enquiry_cr(st, RNR, RSP, 0); | |
1515 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | static void | |
1520 | l2_clear_own_busy(struct FsmInst *fi, int event, void *arg) | |
1521 | { | |
1522 | struct PStack *st = fi->userdata; | |
1523 | ||
1524 | if(!test_and_clear_bit(FLG_OWN_BUSY, &st->l2.flag)) { | |
1525 | enquiry_cr(st, RR, RSP, 0); | |
1526 | test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag); | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | static void | |
1531 | l2_frame_error(struct FsmInst *fi, int event, void *arg) | |
1532 | { | |
1533 | struct PStack *st = fi->userdata; | |
1534 | ||
1535 | st->ma.layer(st, MDL_ERROR | INDICATION, arg); | |
1536 | } | |
1537 | ||
1538 | static void | |
1539 | l2_frame_error_reest(struct FsmInst *fi, int event, void *arg) | |
1540 | { | |
1541 | struct PStack *st = fi->userdata; | |
1542 | ||
1543 | st->ma.layer(st, MDL_ERROR | INDICATION, arg); | |
1544 | establishlink(fi); | |
1545 | test_and_clear_bit(FLG_L3_INIT, &st->l2.flag); | |
1546 | } | |
1547 | ||
1548 | static struct FsmNode L2FnList[] __initdata = | |
1549 | { | |
1550 | {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign}, | |
1551 | {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3}, | |
1552 | {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish}, | |
1553 | {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3}, | |
1554 | {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish}, | |
1555 | {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish}, | |
1556 | {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release}, | |
1557 | {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel}, | |
1558 | {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect}, | |
1559 | {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect}, | |
1560 | {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest}, | |
1561 | {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull}, | |
1562 | {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue}, | |
1563 | {ST_L2_1, EV_L2_DL_UNIT_DATA, l2_queue_ui_assign}, | |
1564 | {ST_L2_2, EV_L2_DL_UNIT_DATA, l2_queue_ui}, | |
1565 | {ST_L2_3, EV_L2_DL_UNIT_DATA, l2_queue_ui}, | |
1566 | {ST_L2_4, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1567 | {ST_L2_5, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1568 | {ST_L2_6, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1569 | {ST_L2_7, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1570 | {ST_L2_8, EV_L2_DL_UNIT_DATA, l2_send_ui}, | |
1571 | {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei}, | |
1572 | {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei}, | |
1573 | {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei}, | |
1574 | {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove}, | |
1575 | {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove}, | |
1576 | {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove}, | |
1577 | {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove}, | |
1578 | {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove}, | |
1579 | {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove}, | |
1580 | {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove}, | |
1581 | {ST_L2_4, EV_L2_SABME, l2_start_multi}, | |
1582 | {ST_L2_5, EV_L2_SABME, l2_send_UA}, | |
1583 | {ST_L2_6, EV_L2_SABME, l2_send_DM}, | |
1584 | {ST_L2_7, EV_L2_SABME, l2_restart_multi}, | |
1585 | {ST_L2_8, EV_L2_SABME, l2_restart_multi}, | |
1586 | {ST_L2_4, EV_L2_DISC, l2_send_DM}, | |
1587 | {ST_L2_5, EV_L2_DISC, l2_send_DM}, | |
1588 | {ST_L2_6, EV_L2_DISC, l2_send_UA}, | |
1589 | {ST_L2_7, EV_L2_DISC, l2_stop_multi}, | |
1590 | {ST_L2_8, EV_L2_DISC, l2_stop_multi}, | |
1591 | {ST_L2_4, EV_L2_UA, l2_mdl_error_ua}, | |
1592 | {ST_L2_5, EV_L2_UA, l2_connected}, | |
1593 | {ST_L2_6, EV_L2_UA, l2_released}, | |
1594 | {ST_L2_7, EV_L2_UA, l2_mdl_error_ua}, | |
1595 | {ST_L2_8, EV_L2_UA, l2_mdl_error_ua}, | |
1596 | {ST_L2_4, EV_L2_DM, l2_reestablish}, | |
1597 | {ST_L2_5, EV_L2_DM, l2_st5_dm_release}, | |
1598 | {ST_L2_6, EV_L2_DM, l2_st6_dm_release}, | |
1599 | {ST_L2_7, EV_L2_DM, l2_mdl_error_dm}, | |
1600 | {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm}, | |
1601 | {ST_L2_1, EV_L2_UI, l2_got_ui}, | |
1602 | {ST_L2_2, EV_L2_UI, l2_got_ui}, | |
1603 | {ST_L2_3, EV_L2_UI, l2_got_ui}, | |
1604 | {ST_L2_4, EV_L2_UI, l2_got_ui}, | |
1605 | {ST_L2_5, EV_L2_UI, l2_got_ui}, | |
1606 | {ST_L2_6, EV_L2_UI, l2_got_ui}, | |
1607 | {ST_L2_7, EV_L2_UI, l2_got_ui}, | |
1608 | {ST_L2_8, EV_L2_UI, l2_got_ui}, | |
1609 | {ST_L2_7, EV_L2_FRMR, l2_got_FRMR}, | |
1610 | {ST_L2_8, EV_L2_FRMR, l2_got_FRMR}, | |
1611 | {ST_L2_7, EV_L2_SUPER, l2_st7_got_super}, | |
1612 | {ST_L2_8, EV_L2_SUPER, l2_st8_got_super}, | |
1613 | {ST_L2_7, EV_L2_I, l2_got_iframe}, | |
1614 | {ST_L2_8, EV_L2_I, l2_got_iframe}, | |
1615 | {ST_L2_5, EV_L2_T200, l2_st5_tout_200}, | |
1616 | {ST_L2_6, EV_L2_T200, l2_st6_tout_200}, | |
1617 | {ST_L2_7, EV_L2_T200, l2_st7_tout_200}, | |
1618 | {ST_L2_8, EV_L2_T200, l2_st8_tout_200}, | |
1619 | {ST_L2_7, EV_L2_T203, l2_st7_tout_203}, | |
1620 | {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue}, | |
1621 | {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy}, | |
1622 | {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy}, | |
1623 | {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy}, | |
1624 | {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy}, | |
1625 | {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error}, | |
1626 | {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error}, | |
1627 | {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error}, | |
1628 | {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest}, | |
1629 | {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest}, | |
1630 | {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistant_da}, | |
1631 | {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove}, | |
1632 | {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove}, | |
1633 | {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistant_da}, | |
1634 | {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistant_da}, | |
1635 | {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistant_da}, | |
1636 | {ST_L2_7, EV_L1_DEACTIVATE, l2_persistant_da}, | |
1637 | {ST_L2_8, EV_L1_DEACTIVATE, l2_persistant_da}, | |
1638 | }; | |
1639 | ||
1640 | #define L2_FN_COUNT (sizeof(L2FnList)/sizeof(struct FsmNode)) | |
1641 | ||
1642 | static void | |
1643 | isdnl2_l1l2(struct PStack *st, int pr, void *arg) | |
1644 | { | |
1645 | struct sk_buff *skb = arg; | |
1646 | u_char *datap; | |
1647 | int ret = 1, len; | |
1648 | int c = 0; | |
1649 | ||
1650 | switch (pr) { | |
1651 | case (PH_DATA | INDICATION): | |
1652 | datap = skb->data; | |
1653 | len = l2addrsize(&st->l2); | |
1654 | if (skb->len > len) | |
1655 | datap += len; | |
1656 | else { | |
1657 | FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'N'); | |
1658 | FreeSkb(skb); | |
1659 | return; | |
1660 | } | |
1661 | if (!(*datap & 1)) { /* I-Frame */ | |
1662 | if(!(c = iframe_error(st, skb))) | |
1663 | ret = FsmEvent(&st->l2.l2m, EV_L2_I, skb); | |
1664 | } else if (IsSFrame(datap, st)) { /* S-Frame */ | |
1665 | if(!(c = super_error(st, skb))) | |
1666 | ret = FsmEvent(&st->l2.l2m, EV_L2_SUPER, skb); | |
1667 | } else if (IsUI(datap)) { | |
1668 | if(!(c = UI_error(st, skb))) | |
1669 | ret = FsmEvent(&st->l2.l2m, EV_L2_UI, skb); | |
1670 | } else if (IsSABME(datap, st)) { | |
1671 | if(!(c = unnum_error(st, skb, CMD))) | |
1672 | ret = FsmEvent(&st->l2.l2m, EV_L2_SABME, skb); | |
1673 | } else if (IsUA(datap)) { | |
1674 | if(!(c = unnum_error(st, skb, RSP))) | |
1675 | ret = FsmEvent(&st->l2.l2m, EV_L2_UA, skb); | |
1676 | } else if (IsDISC(datap)) { | |
1677 | if(!(c = unnum_error(st, skb, CMD))) | |
1678 | ret = FsmEvent(&st->l2.l2m, EV_L2_DISC, skb); | |
1679 | } else if (IsDM(datap)) { | |
1680 | if(!(c = unnum_error(st, skb, RSP))) | |
1681 | ret = FsmEvent(&st->l2.l2m, EV_L2_DM, skb); | |
1682 | } else if (IsFRMR(datap)) { | |
1683 | if(!(c = FRMR_error(st,skb))) | |
1684 | ret = FsmEvent(&st->l2.l2m, EV_L2_FRMR, skb); | |
1685 | } else { | |
1686 | FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'L'); | |
1687 | FreeSkb(skb); | |
1688 | ret = 0; | |
1689 | } | |
1690 | if(c) { | |
1691 | FreeSkb(skb); | |
1692 | FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c); | |
1693 | ret = 0; | |
1694 | } | |
1695 | if (ret) | |
1696 | FreeSkb(skb); | |
1697 | break; | |
1698 | case (PH_PULL | CONFIRM): | |
1699 | FsmEvent(&st->l2.l2m, EV_L2_ACK_PULL, arg); | |
1700 | break; | |
1701 | case (PH_PAUSE | INDICATION): | |
1702 | test_and_set_bit(FLG_DCHAN_BUSY, &st->l2.flag); | |
1703 | break; | |
1704 | case (PH_PAUSE | CONFIRM): | |
1705 | test_and_clear_bit(FLG_DCHAN_BUSY, &st->l2.flag); | |
1706 | break; | |
1707 | case (PH_ACTIVATE | CONFIRM): | |
1708 | case (PH_ACTIVATE | INDICATION): | |
1709 | test_and_set_bit(FLG_L1_ACTIV, &st->l2.flag); | |
1710 | if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag)) | |
1711 | FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg); | |
1712 | break; | |
1713 | case (PH_DEACTIVATE | INDICATION): | |
1714 | case (PH_DEACTIVATE | CONFIRM): | |
1715 | test_and_clear_bit(FLG_L1_ACTIV, &st->l2.flag); | |
1716 | FsmEvent(&st->l2.l2m, EV_L1_DEACTIVATE, arg); | |
1717 | break; | |
1718 | default: | |
1719 | l2m_debug(&st->l2.l2m, "l2 unknown pr %04x", pr); | |
1720 | break; | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | static void | |
1725 | isdnl2_l3l2(struct PStack *st, int pr, void *arg) | |
1726 | { | |
1727 | switch (pr) { | |
1728 | case (DL_DATA | REQUEST): | |
1729 | if (FsmEvent(&st->l2.l2m, EV_L2_DL_DATA, arg)) { | |
1730 | dev_kfree_skb((struct sk_buff *) arg); | |
1731 | } | |
1732 | break; | |
1733 | case (DL_UNIT_DATA | REQUEST): | |
1734 | if (FsmEvent(&st->l2.l2m, EV_L2_DL_UNIT_DATA, arg)) { | |
1735 | dev_kfree_skb((struct sk_buff *) arg); | |
1736 | } | |
1737 | break; | |
1738 | case (DL_ESTABLISH | REQUEST): | |
1739 | if (test_bit(FLG_L1_ACTIV, &st->l2.flag)) { | |
1740 | if (test_bit(FLG_LAPD, &st->l2.flag) || | |
1741 | test_bit(FLG_ORIG, &st->l2.flag)) { | |
1742 | FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg); | |
1743 | } | |
1744 | } else { | |
1745 | if (test_bit(FLG_LAPD, &st->l2.flag) || | |
1746 | test_bit(FLG_ORIG, &st->l2.flag)) { | |
1747 | test_and_set_bit(FLG_ESTAB_PEND, &st->l2.flag); | |
1748 | } | |
1749 | st->l2.l2l1(st, PH_ACTIVATE, NULL); | |
1750 | } | |
1751 | break; | |
1752 | case (DL_RELEASE | REQUEST): | |
1753 | if (test_bit(FLG_LAPB, &st->l2.flag)) { | |
1754 | st->l2.l2l1(st, PH_DEACTIVATE, NULL); | |
1755 | } | |
1756 | FsmEvent(&st->l2.l2m, EV_L2_DL_RELEASE_REQ, arg); | |
1757 | break; | |
1758 | case (MDL_ASSIGN | REQUEST): | |
1759 | FsmEvent(&st->l2.l2m, EV_L2_MDL_ASSIGN, arg); | |
1760 | break; | |
1761 | case (MDL_REMOVE | REQUEST): | |
1762 | FsmEvent(&st->l2.l2m, EV_L2_MDL_REMOVE, arg); | |
1763 | break; | |
1764 | case (MDL_ERROR | RESPONSE): | |
1765 | FsmEvent(&st->l2.l2m, EV_L2_MDL_ERROR, arg); | |
1766 | break; | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | void | |
1771 | releasestack_isdnl2(struct PStack *st) | |
1772 | { | |
1773 | FsmDelTimer(&st->l2.t200, 21); | |
1774 | FsmDelTimer(&st->l2.t203, 16); | |
1775 | skb_queue_purge(&st->l2.i_queue); | |
1776 | skb_queue_purge(&st->l2.ui_queue); | |
1777 | ReleaseWin(&st->l2); | |
1778 | } | |
1779 | ||
1780 | static void | |
1781 | l2m_debug(struct FsmInst *fi, char *fmt, ...) | |
1782 | { | |
1783 | va_list args; | |
1784 | struct PStack *st = fi->userdata; | |
1785 | ||
1786 | va_start(args, fmt); | |
1787 | VHiSax_putstatus(st->l1.hardware, st->l2.debug_id, fmt, args); | |
1788 | va_end(args); | |
1789 | } | |
1790 | ||
1791 | void | |
1792 | setstack_isdnl2(struct PStack *st, char *debug_id) | |
1793 | { | |
1794 | spin_lock_init(&st->l2.lock); | |
1795 | st->l1.l1l2 = isdnl2_l1l2; | |
1796 | st->l3.l3l2 = isdnl2_l3l2; | |
1797 | ||
1798 | skb_queue_head_init(&st->l2.i_queue); | |
1799 | skb_queue_head_init(&st->l2.ui_queue); | |
1800 | InitWin(&st->l2); | |
1801 | st->l2.debug = 0; | |
1802 | ||
1803 | st->l2.l2m.fsm = &l2fsm; | |
1804 | if (test_bit(FLG_LAPB, &st->l2.flag)) | |
1805 | st->l2.l2m.state = ST_L2_4; | |
1806 | else | |
1807 | st->l2.l2m.state = ST_L2_1; | |
1808 | st->l2.l2m.debug = 0; | |
1809 | st->l2.l2m.userdata = st; | |
1810 | st->l2.l2m.userint = 0; | |
1811 | st->l2.l2m.printdebug = l2m_debug; | |
1812 | strcpy(st->l2.debug_id, debug_id); | |
1813 | ||
1814 | FsmInitTimer(&st->l2.l2m, &st->l2.t200); | |
1815 | FsmInitTimer(&st->l2.l2m, &st->l2.t203); | |
1816 | } | |
1817 | ||
1818 | static void | |
1819 | transl2_l3l2(struct PStack *st, int pr, void *arg) | |
1820 | { | |
1821 | switch (pr) { | |
1822 | case (DL_DATA | REQUEST): | |
1823 | case (DL_UNIT_DATA | REQUEST): | |
1824 | st->l2.l2l1(st, PH_DATA | REQUEST, arg); | |
1825 | break; | |
1826 | case (DL_ESTABLISH | REQUEST): | |
1827 | st->l2.l2l1(st, PH_ACTIVATE | REQUEST, NULL); | |
1828 | break; | |
1829 | case (DL_RELEASE | REQUEST): | |
1830 | st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL); | |
1831 | break; | |
1832 | } | |
1833 | } | |
1834 | ||
1835 | void | |
1836 | setstack_transl2(struct PStack *st) | |
1837 | { | |
1838 | st->l3.l3l2 = transl2_l3l2; | |
1839 | } | |
1840 | ||
1841 | void | |
1842 | releasestack_transl2(struct PStack *st) | |
1843 | { | |
1844 | } | |
1845 | ||
1846 | int __init | |
1847 | Isdnl2New(void) | |
1848 | { | |
1849 | l2fsm.state_count = L2_STATE_COUNT; | |
1850 | l2fsm.event_count = L2_EVENT_COUNT; | |
1851 | l2fsm.strEvent = strL2Event; | |
1852 | l2fsm.strState = strL2State; | |
1853 | return FsmNew(&l2fsm, L2FnList, L2_FN_COUNT); | |
1854 | } | |
1855 | ||
1856 | void | |
1857 | Isdnl2Free(void) | |
1858 | { | |
1859 | FsmFree(&l2fsm); | |
1860 | } |