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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / isdn / hisax / isdnl2.c
blobcfff0c41d2986da7c3baf404b5e3a63b922127b1
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 <linux/gfp.h>
20 #include "hisax.h"
21 #include "isdnl2.h"
22
23 const char *l2_revision = "$Revision: 2.30.2.4 $";
24
25 static void l2m_debug(struct FsmInst *fi, char *fmt, ...);
26
27 static struct Fsm l2fsm;
28
29 enum {
30 ST_L2_1,
31 ST_L2_2,
32 ST_L2_3,
33 ST_L2_4,
34 ST_L2_5,
35 ST_L2_6,
36 ST_L2_7,
37 ST_L2_8,
38 };
39
40 #define L2_STATE_COUNT (ST_L2_8+1)
41
42 static char *strL2State[] =
43 {
44 "ST_L2_1",
45 "ST_L2_2",
46 "ST_L2_3",
47 "ST_L2_4",
48 "ST_L2_5",
49 "ST_L2_6",
50 "ST_L2_7",
51 "ST_L2_8",
52 };
53
54 enum {
55 EV_L2_UI,
56 EV_L2_SABME,
57 EV_L2_DISC,
58 EV_L2_DM,
59 EV_L2_UA,
60 EV_L2_FRMR,
61 EV_L2_SUPER,
62 EV_L2_I,
63 EV_L2_DL_DATA,
64 EV_L2_ACK_PULL,
65 EV_L2_DL_UNIT_DATA,
66 EV_L2_DL_ESTABLISH_REQ,
67 EV_L2_DL_RELEASE_REQ,
68 EV_L2_MDL_ASSIGN,
69 EV_L2_MDL_REMOVE,
70 EV_L2_MDL_ERROR,
71 EV_L1_DEACTIVATE,
72 EV_L2_T200,
73 EV_L2_T203,
74 EV_L2_SET_OWN_BUSY,
75 EV_L2_CLEAR_OWN_BUSY,
76 EV_L2_FRAME_ERROR,
77 };
78
79 #define L2_EVENT_COUNT (EV_L2_FRAME_ERROR+1)
80
81 static char *strL2Event[] =
82 {
83 "EV_L2_UI",
84 "EV_L2_SABME",
85 "EV_L2_DISC",
86 "EV_L2_DM",
87 "EV_L2_UA",
88 "EV_L2_FRMR",
89 "EV_L2_SUPER",
90 "EV_L2_I",
91 "EV_L2_DL_DATA",
92 "EV_L2_ACK_PULL",
93 "EV_L2_DL_UNIT_DATA",
94 "EV_L2_DL_ESTABLISH_REQ",
95 "EV_L2_DL_RELEASE_REQ",
96 "EV_L2_MDL_ASSIGN",
97 "EV_L2_MDL_REMOVE",
98 "EV_L2_MDL_ERROR",
99 "EV_L1_DEACTIVATE",
100 "EV_L2_T200",
101 "EV_L2_T203",
102 "EV_L2_SET_OWN_BUSY",
103 "EV_L2_CLEAR_OWN_BUSY",
104 "EV_L2_FRAME_ERROR",
105 };
106
107 static int l2addrsize(struct Layer2 *l2);
108
109 static void
110 set_peer_busy(struct Layer2 *l2) {
111 test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
112 if (!skb_queue_empty(&l2->i_queue) ||
113 !skb_queue_empty(&l2->ui_queue))
114 test_and_set_bit(FLG_L2BLOCK, &l2->flag);
115 }
116
117 static void
118 clear_peer_busy(struct Layer2 *l2) {
119 if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
120 test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
121 }
122
123 static void
124 InitWin(struct Layer2 *l2)
125 {
126 int i;
127
128 for (i = 0; i < MAX_WINDOW; i++)
129 l2->windowar[i] = NULL;
130 }
131
132 static int
133 freewin1(struct Layer2 *l2)
134 {
135 int i, cnt = 0;
136
137 for (i = 0; i < MAX_WINDOW; i++) {
138 if (l2->windowar[i]) {
139 cnt++;
140 dev_kfree_skb(l2->windowar[i]);
141 l2->windowar[i] = NULL;
142 }
143 }
144 return cnt;
145 }
146
147 static inline void
148 freewin(struct PStack *st)
149 {
150 freewin1(&st->l2);
151 }
152
153 static void
154 ReleaseWin(struct Layer2 *l2)
155 {
156 int cnt;
157
158 if((cnt = freewin1(l2)))
159 printk(KERN_WARNING "isdl2 freed %d skbuffs in release\n", cnt);
160 }
161
162 static inline unsigned int
163 cansend(struct PStack *st)
164 {
165 unsigned int p1;
166
167 if(test_bit(FLG_MOD128, &st->l2.flag))
168 p1 = (st->l2.vs - st->l2.va) % 128;
169 else
170 p1 = (st->l2.vs - st->l2.va) % 8;
171 return ((p1 < st->l2.window) && !test_bit(FLG_PEER_BUSY, &st->l2.flag));
172 }
173
174 static inline void
175 clear_exception(struct Layer2 *l2)
176 {
177 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
178 test_and_clear_bit(FLG_REJEXC, &l2->flag);
179 test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
180 clear_peer_busy(l2);
181 }
182
183 static inline int
184 l2headersize(struct Layer2 *l2, int ui)
185 {
186 return (((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
187 (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1));
188 }
189
190 inline int
191 l2addrsize(struct Layer2 *l2)
192 {
193 return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
194 }
195
196 static int
197 sethdraddr(struct Layer2 *l2, u_char * header, int rsp)
198 {
199 u_char *ptr = header;
200 int crbit = rsp;
201
202 if (test_bit(FLG_LAPD, &l2->flag)) {
203 *ptr++ = (l2->sap << 2) | (rsp ? 2 : 0);
204 *ptr++ = (l2->tei << 1) | 1;
205 return (2);
206 } else {
207 if (test_bit(FLG_ORIG, &l2->flag))
208 crbit = !crbit;
209 if (crbit)
210 *ptr++ = 1;
211 else
212 *ptr++ = 3;
213 return (1);
214 }
215 }
216
217 static inline void
218 enqueue_super(struct PStack *st,
219 struct sk_buff *skb)
220 {
221 if (test_bit(FLG_LAPB, &st->l2.flag))
222 st->l1.bcs->tx_cnt += skb->len;
223 st->l2.l2l1(st, PH_DATA | REQUEST, skb);
224 }
225
226 #define enqueue_ui(a, b) enqueue_super(a, b)
227
228 static inline int
229 IsUI(u_char * data)
230 {
231 return ((data[0] & 0xef) == UI);
232 }
233
234 static inline int
235 IsUA(u_char * data)
236 {
237 return ((data[0] & 0xef) == UA);
238 }
239
240 static inline int
241 IsDM(u_char * data)
242 {
243 return ((data[0] & 0xef) == DM);
244 }
245
246 static inline int
247 IsDISC(u_char * data)
248 {
249 return ((data[0] & 0xef) == DISC);
250 }
251
252 static inline int
253 IsSFrame(u_char * data, struct PStack *st)
254 {
255 register u_char d = *data;
256
257 if (!test_bit(FLG_MOD128, &st->l2.flag))
258 d &= 0xf;
259 return(((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c));
260 }
261
262 static inline int
263 IsSABME(u_char * data, struct PStack *st)
264 {
265 u_char d = data[0] & ~0x10;
266
267 return (test_bit(FLG_MOD128, &st->l2.flag) ? d == SABME : d == SABM);
268 }
269
270 static inline int
271 IsREJ(u_char * data, struct PStack *st)
272 {
273 return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ);
274 }
275
276 static inline int
277 IsFRMR(u_char * data)
278 {
279 return ((data[0] & 0xef) == FRMR);
280 }
281
282 static inline int
283 IsRNR(u_char * data, struct PStack *st)
284 {
285 return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR);
286 }
287
288 static int
289 iframe_error(struct PStack *st, struct sk_buff *skb)
290 {
291 int i = l2addrsize(&st->l2) + (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1);
292 int rsp = *skb->data & 0x2;
293
294 if (test_bit(FLG_ORIG, &st->l2.flag))
295 rsp = !rsp;
296
297 if (rsp)
298 return 'L';
299
300
301 if (skb->len < i)
302 return 'N';
303
304 if ((skb->len - i) > st->l2.maxlen)
305 return 'O';
306
307
308 return 0;
309 }
310
311 static int
312 super_error(struct PStack *st, struct sk_buff *skb)
313 {
314 if (skb->len != l2addrsize(&st->l2) +
315 (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1))
316 return 'N';
317
318 return 0;
319 }
320
321 static int
322 unnum_error(struct PStack *st, struct sk_buff *skb, int wantrsp)
323 {
324 int rsp = (*skb->data & 0x2) >> 1;
325 if (test_bit(FLG_ORIG, &st->l2.flag))
326 rsp = !rsp;
327
328 if (rsp != wantrsp)
329 return 'L';
330
331 if (skb->len != l2addrsize(&st->l2) + 1)
332 return 'N';
333
334 return 0;
335 }
336
337 static int
338 UI_error(struct PStack *st, struct sk_buff *skb)
339 {
340 int rsp = *skb->data & 0x2;
341 if (test_bit(FLG_ORIG, &st->l2.flag))
342 rsp = !rsp;
343
344 if (rsp)
345 return 'L';
346
347 if (skb->len > st->l2.maxlen + l2addrsize(&st->l2) + 1)
348 return 'O';
349
350 return 0;
351 }
352
353 static int
354 FRMR_error(struct PStack *st, struct sk_buff *skb)
355 {
356 int headers = l2addrsize(&st->l2) + 1;
357 u_char *datap = skb->data + headers;
358 int rsp = *skb->data & 0x2;
359
360 if (test_bit(FLG_ORIG, &st->l2.flag))
361 rsp = !rsp;
362
363 if (!rsp)
364 return 'L';
365
366 if (test_bit(FLG_MOD128, &st->l2.flag)) {
367 if (skb->len < headers + 5)
368 return 'N';
369 else
370 l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x %2x %2x",
371 datap[0], datap[1], datap[2],
372 datap[3], datap[4]);
373 } else {
374 if (skb->len < headers + 3)
375 return 'N';
376 else
377 l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x",
378 datap[0], datap[1], datap[2]);
379 }
380
381 return 0;
382 }
383
384 static unsigned int
385 legalnr(struct PStack *st, unsigned int nr)
386 {
387 struct Layer2 *l2 = &st->l2;
388
389 if(test_bit(FLG_MOD128, &l2->flag))
390 return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128);
391 else
392 return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8);
393 }
394
395 static void
396 setva(struct PStack *st, unsigned int nr)
397 {
398 struct Layer2 *l2 = &st->l2;
399 int len;
400 u_long flags;
401
402 spin_lock_irqsave(&l2->lock, flags);
403 while (l2->va != nr) {
404 (l2->va)++;
405 if(test_bit(FLG_MOD128, &l2->flag))
406 l2->va %= 128;
407 else
408 l2->va %= 8;
409 len = l2->windowar[l2->sow]->len;
410 if (PACKET_NOACK == l2->windowar[l2->sow]->pkt_type)
411 len = -1;
412 dev_kfree_skb(l2->windowar[l2->sow]);
413 l2->windowar[l2->sow] = NULL;
414 l2->sow = (l2->sow + 1) % l2->window;
415 spin_unlock_irqrestore(&l2->lock, flags);
416 if (test_bit(FLG_LLI_L2WAKEUP, &st->lli.flag) && (len >=0))
417 lli_writewakeup(st, len);
418 spin_lock_irqsave(&l2->lock, flags);
419 }
420 spin_unlock_irqrestore(&l2->lock, flags);
421 }
422
423 static void
424 send_uframe(struct PStack *st, u_char cmd, u_char cr)
425 {
426 struct sk_buff *skb;
427 u_char tmp[MAX_HEADER_LEN];
428 int i;
429
430 i = sethdraddr(&st->l2, tmp, cr);
431 tmp[i++] = cmd;
432 if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
433 printk(KERN_WARNING "isdl2 can't alloc sbbuff for send_uframe\n");
434 return;
435 }
436 memcpy(skb_put(skb, i), tmp, i);
437 enqueue_super(st, skb);
438 }
439
440 static inline u_char
441 get_PollFlag(struct PStack * st, struct sk_buff * skb)
442 {
443 return (skb->data[l2addrsize(&(st->l2))] & 0x10);
444 }
445
446 static inline u_char
447 get_PollFlagFree(struct PStack *st, struct sk_buff *skb)
448 {
449 u_char PF;
450
451 PF = get_PollFlag(st, skb);
452 dev_kfree_skb(skb);
453 return (PF);
454 }
455
456 static inline void
457 start_t200(struct PStack *st, int i)
458 {
459 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
460 test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
461 }
462
463 static inline void
464 restart_t200(struct PStack *st, int i)
465 {
466 FsmRestartTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
467 test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
468 }
469
470 static inline void
471 stop_t200(struct PStack *st, int i)
472 {
473 if(test_and_clear_bit(FLG_T200_RUN, &st->l2.flag))
474 FsmDelTimer(&st->l2.t200, i);
475 }
476
477 static inline void
478 st5_dl_release_l2l3(struct PStack *st)
479 {
480 int pr;
481
482 if(test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
483 pr = DL_RELEASE | CONFIRM;
484 else
485 pr = DL_RELEASE | INDICATION;
486
487 st->l2.l2l3(st, pr, NULL);
488 }
489
490 static inline void
491 lapb_dl_release_l2l3(struct PStack *st, int f)
492 {
493 if (test_bit(FLG_LAPB, &st->l2.flag))
494 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
495 st->l2.l2l3(st, DL_RELEASE | f, NULL);
496 }
497
498 static void
499 establishlink(struct FsmInst *fi)
500 {
501 struct PStack *st = fi->userdata;
502 u_char cmd;
503
504 clear_exception(&st->l2);
505 st->l2.rc = 0;
506 cmd = (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | 0x10;
507 send_uframe(st, cmd, CMD);
508 FsmDelTimer(&st->l2.t203, 1);
509 restart_t200(st, 1);
510 test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
511 freewin(st);
512 FsmChangeState(fi, ST_L2_5);
513 }
514
515 static void
516 l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
517 {
518 struct sk_buff *skb = arg;
519 struct PStack *st = fi->userdata;
520
521 if (get_PollFlagFree(st, skb))
522 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'C');
523 else
524 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'D');
525 }
526
527 static void
528 l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
529 {
530 struct sk_buff *skb = arg;
531 struct PStack *st = fi->userdata;
532
533 if (get_PollFlagFree(st, skb))
534 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
535 else {
536 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
537 establishlink(fi);
538 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
539 }
540 }
541
542 static void
543 l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
544 {
545 struct sk_buff *skb = arg;
546 struct PStack *st = fi->userdata;
547
548 if (get_PollFlagFree(st, skb))
549 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
550 else {
551 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
552 }
553 establishlink(fi);
554 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
555 }
556
557 static void
558 l2_go_st3(struct FsmInst *fi, int event, void *arg)
559 {
560 FsmChangeState(fi, ST_L2_3);
561 }
562
563 static void
564 l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
565 {
566 struct PStack *st = fi->userdata;
567
568 FsmChangeState(fi, ST_L2_3);
569 st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
570 }
571
572 static void
573 l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
574 {
575 struct PStack *st = fi->userdata;
576 struct sk_buff *skb = arg;
577
578 skb_queue_tail(&st->l2.ui_queue, skb);
579 FsmChangeState(fi, ST_L2_2);
580 st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
581 }
582
583 static void
584 l2_queue_ui(struct FsmInst *fi, int event, void *arg)
585 {
586 struct PStack *st = fi->userdata;
587 struct sk_buff *skb = arg;
588
589 skb_queue_tail(&st->l2.ui_queue, skb);
590 }
591
592 static void
593 tx_ui(struct PStack *st)
594 {
595 struct sk_buff *skb;
596 u_char header[MAX_HEADER_LEN];
597 int i;
598
599 i = sethdraddr(&(st->l2), header, CMD);
600 header[i++] = UI;
601 while ((skb = skb_dequeue(&st->l2.ui_queue))) {
602 memcpy(skb_push(skb, i), header, i);
603 enqueue_ui(st, skb);
604 }
605 }
606
607 static void
608 l2_send_ui(struct FsmInst *fi, int event, void *arg)
609 {
610 struct PStack *st = fi->userdata;
611 struct sk_buff *skb = arg;
612
613 skb_queue_tail(&st->l2.ui_queue, skb);
614 tx_ui(st);
615 }
616
617 static void
618 l2_got_ui(struct FsmInst *fi, int event, void *arg)
619 {
620 struct PStack *st = fi->userdata;
621 struct sk_buff *skb = arg;
622
623 skb_pull(skb, l2headersize(&st->l2, 1));
624 st->l2.l2l3(st, DL_UNIT_DATA | INDICATION, skb);
625 /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
626 * in states 1-3 for broadcast
627 */
628
629
630 }
631
632 static void
633 l2_establish(struct FsmInst *fi, int event, void *arg)
634 {
635 struct PStack *st = fi->userdata;
636
637 establishlink(fi);
638 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
639 }
640
641 static void
642 l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
643 {
644 struct PStack *st = fi->userdata;
645
646 skb_queue_purge(&st->l2.i_queue);
647 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
648 test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
649 }
650
651 static void
652 l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
653 {
654 struct PStack *st = fi->userdata;
655
656 skb_queue_purge(&st->l2.i_queue);
657 establishlink(fi);
658 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
659 }
660
661 static void
662 l2_release(struct FsmInst *fi, int event, void *arg)
663 {
664 struct PStack *st = fi->userdata;
665
666 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
667 }
668
669 static void
670 l2_pend_rel(struct FsmInst *fi, int event, void *arg)
671 {
672 struct PStack *st = fi->userdata;
673
674 test_and_set_bit(FLG_PEND_REL, &st->l2.flag);
675 }
676
677 static void
678 l2_disconnect(struct FsmInst *fi, int event, void *arg)
679 {
680 struct PStack *st = fi->userdata;
681
682 skb_queue_purge(&st->l2.i_queue);
683 freewin(st);
684 FsmChangeState(fi, ST_L2_6);
685 st->l2.rc = 0;
686 send_uframe(st, DISC | 0x10, CMD);
687 FsmDelTimer(&st->l2.t203, 1);
688 restart_t200(st, 2);
689 }
690
691 static void
692 l2_start_multi(struct FsmInst *fi, int event, void *arg)
693 {
694 struct PStack *st = fi->userdata;
695 struct sk_buff *skb = arg;
696
697 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
698
699 clear_exception(&st->l2);
700 st->l2.vs = 0;
701 st->l2.va = 0;
702 st->l2.vr = 0;
703 st->l2.sow = 0;
704 FsmChangeState(fi, ST_L2_7);
705 FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
706
707 st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
708 }
709
710 static void
711 l2_send_UA(struct FsmInst *fi, int event, void *arg)
712 {
713 struct PStack *st = fi->userdata;
714 struct sk_buff *skb = arg;
715
716 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
717 }
718
719 static void
720 l2_send_DM(struct FsmInst *fi, int event, void *arg)
721 {
722 struct PStack *st = fi->userdata;
723 struct sk_buff *skb = arg;
724
725 send_uframe(st, DM | get_PollFlagFree(st, skb), RSP);
726 }
727
728 static void
729 l2_restart_multi(struct FsmInst *fi, int event, void *arg)
730 {
731 struct PStack *st = fi->userdata;
732 struct sk_buff *skb = arg;
733 int est = 0, state;
734
735 state = fi->state;
736
737 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
738
739 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'F');
740
741 if (st->l2.vs != st->l2.va) {
742 skb_queue_purge(&st->l2.i_queue);
743 est = 1;
744 }
745
746 clear_exception(&st->l2);
747 st->l2.vs = 0;
748 st->l2.va = 0;
749 st->l2.vr = 0;
750 st->l2.sow = 0;
751 FsmChangeState(fi, ST_L2_7);
752 stop_t200(st, 3);
753 FsmRestartTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
754
755 if (est)
756 st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
757
758 if ((ST_L2_7==state) || (ST_L2_8 == state))
759 if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
760 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
761 }
762
763 static void
764 l2_stop_multi(struct FsmInst *fi, int event, void *arg)
765 {
766 struct PStack *st = fi->userdata;
767 struct sk_buff *skb = arg;
768
769 FsmChangeState(fi, ST_L2_4);
770 FsmDelTimer(&st->l2.t203, 3);
771 stop_t200(st, 4);
772
773 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
774
775 skb_queue_purge(&st->l2.i_queue);
776 freewin(st);
777 lapb_dl_release_l2l3(st, INDICATION);
778 }
779
780 static void
781 l2_connected(struct FsmInst *fi, int event, void *arg)
782 {
783 struct PStack *st = fi->userdata;
784 struct sk_buff *skb = arg;
785 int pr=-1;
786
787 if (!get_PollFlag(st, skb)) {
788 l2_mdl_error_ua(fi, event, arg);
789 return;
790 }
791 dev_kfree_skb(skb);
792
793 if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
794 l2_disconnect(fi, event, arg);
795
796 if (test_and_clear_bit(FLG_L3_INIT, &st->l2.flag)) {
797 pr = DL_ESTABLISH | CONFIRM;
798 } else if (st->l2.vs != st->l2.va) {
799 skb_queue_purge(&st->l2.i_queue);
800 pr = DL_ESTABLISH | INDICATION;
801 }
802
803 stop_t200(st, 5);
804
805 st->l2.vr = 0;
806 st->l2.vs = 0;
807 st->l2.va = 0;
808 st->l2.sow = 0;
809 FsmChangeState(fi, ST_L2_7);
810 FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 4);
811
812 if (pr != -1)
813 st->l2.l2l3(st, pr, NULL);
814
815 if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
816 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
817 }
818
819 static void
820 l2_released(struct FsmInst *fi, int event, void *arg)
821 {
822 struct PStack *st = fi->userdata;
823 struct sk_buff *skb = arg;
824
825 if (!get_PollFlag(st, skb)) {
826 l2_mdl_error_ua(fi, event, arg);
827 return;
828 }
829 dev_kfree_skb(skb);
830
831 stop_t200(st, 6);
832 lapb_dl_release_l2l3(st, CONFIRM);
833 FsmChangeState(fi, ST_L2_4);
834 }
835
836 static void
837 l2_reestablish(struct FsmInst *fi, int event, void *arg)
838 {
839 struct PStack *st = fi->userdata;
840 struct sk_buff *skb = arg;
841
842 if (!get_PollFlagFree(st, skb)) {
843 establishlink(fi);
844 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
845 }
846 }
847
848 static void
849 l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
850 {
851 struct PStack *st = fi->userdata;
852 struct sk_buff *skb = arg;
853
854 if (get_PollFlagFree(st, skb)) {
855 stop_t200(st, 7);
856 if (!test_bit(FLG_L3_INIT, &st->l2.flag))
857 skb_queue_purge(&st->l2.i_queue);
858 if (test_bit(FLG_LAPB, &st->l2.flag))
859 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
860 st5_dl_release_l2l3(st);
861 FsmChangeState(fi, ST_L2_4);
862 }
863 }
864
865 static void
866 l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
867 {
868 struct PStack *st = fi->userdata;
869 struct sk_buff *skb = arg;
870
871 if (get_PollFlagFree(st, skb)) {
872 stop_t200(st, 8);
873 lapb_dl_release_l2l3(st, CONFIRM);
874 FsmChangeState(fi, ST_L2_4);
875 }
876 }
877
878 static inline void
879 enquiry_cr(struct PStack *st, u_char typ, u_char cr, u_char pf)
880 {
881 struct sk_buff *skb;
882 struct Layer2 *l2;
883 u_char tmp[MAX_HEADER_LEN];
884 int i;
885
886 l2 = &st->l2;
887 i = sethdraddr(l2, tmp, cr);
888 if (test_bit(FLG_MOD128, &l2->flag)) {
889 tmp[i++] = typ;
890 tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0);
891 } else
892 tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0);
893 if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
894 printk(KERN_WARNING "isdl2 can't alloc sbbuff for enquiry_cr\n");
895 return;
896 }
897 memcpy(skb_put(skb, i), tmp, i);
898 enqueue_super(st, skb);
899 }
900
901 static inline void
902 enquiry_response(struct PStack *st)
903 {
904 if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
905 enquiry_cr(st, RNR, RSP, 1);
906 else
907 enquiry_cr(st, RR, RSP, 1);
908 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
909 }
910
911 static inline void
912 transmit_enquiry(struct PStack *st)
913 {
914 if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
915 enquiry_cr(st, RNR, CMD, 1);
916 else
917 enquiry_cr(st, RR, CMD, 1);
918 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
919 start_t200(st, 9);
920 }
921
922
923 static void
924 nrerrorrecovery(struct FsmInst *fi)
925 {
926 struct PStack *st = fi->userdata;
927
928 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'J');
929 establishlink(fi);
930 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
931 }
932
933 static void
934 invoke_retransmission(struct PStack *st, unsigned int nr)
935 {
936 struct Layer2 *l2 = &st->l2;
937 u_int p1;
938 u_long flags;
939
940 spin_lock_irqsave(&l2->lock, flags);
941 if (l2->vs != nr) {
942 while (l2->vs != nr) {
943 (l2->vs)--;
944 if(test_bit(FLG_MOD128, &l2->flag)) {
945 l2->vs %= 128;
946 p1 = (l2->vs - l2->va) % 128;
947 } else {
948 l2->vs %= 8;
949 p1 = (l2->vs - l2->va) % 8;
950 }
951 p1 = (p1 + l2->sow) % l2->window;
952 if (test_bit(FLG_LAPB, &l2->flag))
953 st->l1.bcs->tx_cnt += l2->windowar[p1]->len + l2headersize(l2, 0);
954 skb_queue_head(&l2->i_queue, l2->windowar[p1]);
955 l2->windowar[p1] = NULL;
956 }
957 spin_unlock_irqrestore(&l2->lock, flags);
958 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
959 return;
960 }
961 spin_unlock_irqrestore(&l2->lock, flags);
962 }
963
964 static void
965 l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
966 {
967 struct PStack *st = fi->userdata;
968 struct sk_buff *skb = arg;
969 int PollFlag, rsp, typ = RR;
970 unsigned int nr;
971 struct Layer2 *l2 = &st->l2;
972
973 rsp = *skb->data & 0x2;
974 if (test_bit(FLG_ORIG, &l2->flag))
975 rsp = !rsp;
976
977 skb_pull(skb, l2addrsize(l2));
978 if (IsRNR(skb->data, st)) {
979 set_peer_busy(l2);
980 typ = RNR;
981 } else
982 clear_peer_busy(l2);
983 if (IsREJ(skb->data, st))
984 typ = REJ;
985
986 if (test_bit(FLG_MOD128, &l2->flag)) {
987 PollFlag = (skb->data[1] & 0x1) == 0x1;
988 nr = skb->data[1] >> 1;
989 } else {
990 PollFlag = (skb->data[0] & 0x10);
991 nr = (skb->data[0] >> 5) & 0x7;
992 }
993 dev_kfree_skb(skb);
994
995 if (PollFlag) {
996 if (rsp)
997 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'A');
998 else
999 enquiry_response(st);
1000 }
1001 if (legalnr(st, nr)) {
1002 if (typ == REJ) {
1003 setva(st, nr);
1004 invoke_retransmission(st, nr);
1005 stop_t200(st, 10);
1006 if (FsmAddTimer(&st->l2.t203, st->l2.T203,
1007 EV_L2_T203, NULL, 6))
1008 l2m_debug(&st->l2.l2m, "Restart T203 ST7 REJ");
1009 } else if ((nr == l2->vs) && (typ == RR)) {
1010 setva(st, nr);
1011 stop_t200(st, 11);
1012 FsmRestartTimer(&st->l2.t203, st->l2.T203,
1013 EV_L2_T203, NULL, 7);
1014 } else if ((l2->va != nr) || (typ == RNR)) {
1015 setva(st, nr);
1016 if(typ != RR) FsmDelTimer(&st->l2.t203, 9);
1017 restart_t200(st, 12);
1018 }
1019 if (!skb_queue_empty(&st->l2.i_queue) && (typ == RR))
1020 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1021 } else
1022 nrerrorrecovery(fi);
1023 }
1024
1025 static void
1026 l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg)
1027 {
1028 struct PStack *st = fi->userdata;
1029 struct sk_buff *skb = arg;
1030
1031 if (test_bit(FLG_LAPB, &st->l2.flag))
1032 st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
1033 if (!test_bit(FLG_L3_INIT, &st->l2.flag))
1034 skb_queue_tail(&st->l2.i_queue, skb);
1035 else
1036 dev_kfree_skb(skb);
1037 }
1038
1039 static void
1040 l2_feed_i_pull(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 skb_queue_tail(&st->l2.i_queue, skb);
1048 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1049 }
1050
1051 static void
1052 l2_feed_iqueue(struct FsmInst *fi, int event, void *arg)
1053 {
1054 struct PStack *st = fi->userdata;
1055 struct sk_buff *skb = arg;
1056
1057 if (test_bit(FLG_LAPB, &st->l2.flag))
1058 st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
1059 skb_queue_tail(&st->l2.i_queue, skb);
1060 }
1061
1062 static void
1063 l2_got_iframe(struct FsmInst *fi, int event, void *arg)
1064 {
1065 struct PStack *st = fi->userdata;
1066 struct sk_buff *skb = arg;
1067 struct Layer2 *l2 = &(st->l2);
1068 int PollFlag, ns, i;
1069 unsigned int nr;
1070
1071 i = l2addrsize(l2);
1072 if (test_bit(FLG_MOD128, &l2->flag)) {
1073 PollFlag = ((skb->data[i + 1] & 0x1) == 0x1);
1074 ns = skb->data[i] >> 1;
1075 nr = (skb->data[i + 1] >> 1) & 0x7f;
1076 } else {
1077 PollFlag = (skb->data[i] & 0x10);
1078 ns = (skb->data[i] >> 1) & 0x7;
1079 nr = (skb->data[i] >> 5) & 0x7;
1080 }
1081 if (test_bit(FLG_OWN_BUSY, &l2->flag)) {
1082 dev_kfree_skb(skb);
1083 if(PollFlag) enquiry_response(st);
1084 } else if (l2->vr == ns) {
1085 (l2->vr)++;
1086 if(test_bit(FLG_MOD128, &l2->flag))
1087 l2->vr %= 128;
1088 else
1089 l2->vr %= 8;
1090 test_and_clear_bit(FLG_REJEXC, &l2->flag);
1091
1092 if (PollFlag)
1093 enquiry_response(st);
1094 else
1095 test_and_set_bit(FLG_ACK_PEND, &l2->flag);
1096 skb_pull(skb, l2headersize(l2, 0));
1097 st->l2.l2l3(st, DL_DATA | INDICATION, skb);
1098 } else {
1099 /* n(s)!=v(r) */
1100 dev_kfree_skb(skb);
1101 if (test_and_set_bit(FLG_REJEXC, &l2->flag)) {
1102 if (PollFlag)
1103 enquiry_response(st);
1104 } else {
1105 enquiry_cr(st, REJ, RSP, PollFlag);
1106 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1107 }
1108 }
1109
1110 if (legalnr(st, nr)) {
1111 if (!test_bit(FLG_PEER_BUSY, &st->l2.flag) && (fi->state == ST_L2_7)) {
1112 if (nr == st->l2.vs) {
1113 stop_t200(st, 13);
1114 FsmRestartTimer(&st->l2.t203, st->l2.T203,
1115 EV_L2_T203, NULL, 7);
1116 } else if (nr != st->l2.va)
1117 restart_t200(st, 14);
1118 }
1119 setva(st, nr);
1120 } else {
1121 nrerrorrecovery(fi);
1122 return;
1123 }
1124
1125 if (!skb_queue_empty(&st->l2.i_queue) && (fi->state == ST_L2_7))
1126 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1127 if (test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag))
1128 enquiry_cr(st, RR, RSP, 0);
1129 }
1130
1131 static void
1132 l2_got_tei(struct FsmInst *fi, int event, void *arg)
1133 {
1134 struct PStack *st = fi->userdata;
1135
1136 st->l2.tei = (long) arg;
1137
1138 if (fi->state == ST_L2_3) {
1139 establishlink(fi);
1140 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
1141 } else
1142 FsmChangeState(fi, ST_L2_4);
1143 if (!skb_queue_empty(&st->l2.ui_queue))
1144 tx_ui(st);
1145 }
1146
1147 static void
1148 l2_st5_tout_200(struct FsmInst *fi, int event, void *arg)
1149 {
1150 struct PStack *st = fi->userdata;
1151
1152 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1153 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1154 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1155 } else if (st->l2.rc == st->l2.N200) {
1156 FsmChangeState(fi, ST_L2_4);
1157 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1158 skb_queue_purge(&st->l2.i_queue);
1159 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'G');
1160 if (test_bit(FLG_LAPB, &st->l2.flag))
1161 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
1162 st5_dl_release_l2l3(st);
1163 } else {
1164 st->l2.rc++;
1165 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1166 send_uframe(st, (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM)
1167 | 0x10, CMD);
1168 }
1169 }
1170
1171 static void
1172 l2_st6_tout_200(struct FsmInst *fi, int event, void *arg)
1173 {
1174 struct PStack *st = fi->userdata;
1175
1176 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1177 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1178 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1179 } else if (st->l2.rc == st->l2.N200) {
1180 FsmChangeState(fi, ST_L2_4);
1181 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1182 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'H');
1183 lapb_dl_release_l2l3(st, CONFIRM);
1184 } else {
1185 st->l2.rc++;
1186 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200,
1187 NULL, 9);
1188 send_uframe(st, DISC | 0x10, CMD);
1189 }
1190 }
1191
1192 static void
1193 l2_st7_tout_200(struct FsmInst *fi, int event, void *arg)
1194 {
1195 struct PStack *st = fi->userdata;
1196
1197 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1198 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1199 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1200 return;
1201 }
1202 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1203 st->l2.rc = 0;
1204 FsmChangeState(fi, ST_L2_8);
1205
1206 transmit_enquiry(st);
1207 st->l2.rc++;
1208 }
1209
1210 static void
1211 l2_st8_tout_200(struct FsmInst *fi, int event, void *arg)
1212 {
1213 struct PStack *st = fi->userdata;
1214
1215 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1216 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1217 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1218 return;
1219 }
1220 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1221 if (st->l2.rc == st->l2.N200) {
1222 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'I');
1223 establishlink(fi);
1224 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1225 } else {
1226 transmit_enquiry(st);
1227 st->l2.rc++;
1228 }
1229 }
1230
1231 static void
1232 l2_st7_tout_203(struct FsmInst *fi, int event, void *arg)
1233 {
1234 struct PStack *st = fi->userdata;
1235
1236 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1237 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1238 FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 9);
1239 return;
1240 }
1241 FsmChangeState(fi, ST_L2_8);
1242 transmit_enquiry(st);
1243 st->l2.rc = 0;
1244 }
1245
1246 static void
1247 l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
1248 {
1249 struct PStack *st = fi->userdata;
1250 struct sk_buff *skb;
1251 struct Layer2 *l2 = &st->l2;
1252 u_char header[MAX_HEADER_LEN];
1253 int i, hdr_space_needed;
1254 int unsigned p1;
1255 u_long flags;
1256
1257 if (!cansend(st))
1258 return;
1259
1260 skb = skb_dequeue(&l2->i_queue);
1261 if (!skb)
1262 return;
1263
1264 hdr_space_needed = l2headersize(l2, 0);
1265 if (hdr_space_needed > skb_headroom(skb)) {
1266 struct sk_buff *orig_skb = skb;
1267
1268 skb = skb_realloc_headroom(skb, hdr_space_needed);
1269 if (!skb) {
1270 dev_kfree_skb(orig_skb);
1271 return;
1272 }
1273 }
1274 spin_lock_irqsave(&l2->lock, flags);
1275 if(test_bit(FLG_MOD128, &l2->flag))
1276 p1 = (l2->vs - l2->va) % 128;
1277 else
1278 p1 = (l2->vs - l2->va) % 8;
1279 p1 = (p1 + l2->sow) % l2->window;
1280 if (l2->windowar[p1]) {
1281 printk(KERN_WARNING "isdnl2 try overwrite ack queue entry %d\n",
1282 p1);
1283 dev_kfree_skb(l2->windowar[p1]);
1284 }
1285 l2->windowar[p1] = skb_clone(skb, GFP_ATOMIC);
1286
1287 i = sethdraddr(&st->l2, header, CMD);
1288
1289 if (test_bit(FLG_MOD128, &l2->flag)) {
1290 header[i++] = l2->vs << 1;
1291 header[i++] = l2->vr << 1;
1292 l2->vs = (l2->vs + 1) % 128;
1293 } else {
1294 header[i++] = (l2->vr << 5) | (l2->vs << 1);
1295 l2->vs = (l2->vs + 1) % 8;
1296 }
1297 spin_unlock_irqrestore(&l2->lock, flags);
1298 memcpy(skb_push(skb, i), header, i);
1299 st->l2.l2l1(st, PH_PULL | INDICATION, skb);
1300 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1301 if (!test_and_set_bit(FLG_T200_RUN, &st->l2.flag)) {
1302 FsmDelTimer(&st->l2.t203, 13);
1303 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11);
1304 }
1305 if (!skb_queue_empty(&l2->i_queue) && cansend(st))
1306 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1307 }
1308
1309 static void
1310 l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
1311 {
1312 struct PStack *st = fi->userdata;
1313 struct sk_buff *skb = arg;
1314 int PollFlag, rsp, rnr = 0;
1315 unsigned int nr;
1316 struct Layer2 *l2 = &st->l2;
1317
1318 rsp = *skb->data & 0x2;
1319 if (test_bit(FLG_ORIG, &l2->flag))
1320 rsp = !rsp;
1321
1322 skb_pull(skb, l2addrsize(l2));
1323
1324 if (IsRNR(skb->data, st)) {
1325 set_peer_busy(l2);
1326 rnr = 1;
1327 } else
1328 clear_peer_busy(l2);
1329
1330 if (test_bit(FLG_MOD128, &l2->flag)) {
1331 PollFlag = (skb->data[1] & 0x1) == 0x1;
1332 nr = skb->data[1] >> 1;
1333 } else {
1334 PollFlag = (skb->data[0] & 0x10);
1335 nr = (skb->data[0] >> 5) & 0x7;
1336 }
1337 dev_kfree_skb(skb);
1338
1339 if (rsp && PollFlag) {
1340 if (legalnr(st, nr)) {
1341 if (rnr) {
1342 restart_t200(st, 15);
1343 } else {
1344 stop_t200(st, 16);
1345 FsmAddTimer(&l2->t203, l2->T203,
1346 EV_L2_T203, NULL, 5);
1347 setva(st, nr);
1348 }
1349 invoke_retransmission(st, nr);
1350 FsmChangeState(fi, ST_L2_7);
1351 if (!skb_queue_empty(&l2->i_queue) && cansend(st))
1352 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1353 } else
1354 nrerrorrecovery(fi);
1355 } else {
1356 if (!rsp && PollFlag)
1357 enquiry_response(st);
1358 if (legalnr(st, nr)) {
1359 setva(st, nr);
1360 } else
1361 nrerrorrecovery(fi);
1362 }
1363 }
1364
1365 static void
1366 l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
1367 {
1368 struct PStack *st = fi->userdata;
1369 struct sk_buff *skb = arg;
1370
1371 skb_pull(skb, l2addrsize(&st->l2) + 1);
1372
1373 if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */
1374 (IsUA(skb->data) && (fi->state == ST_L2_7))) {
1375 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'K');
1376 establishlink(fi);
1377 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1378 }
1379 dev_kfree_skb(skb);
1380 }
1381
1382 static void
1383 l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
1384 {
1385 struct PStack *st = fi->userdata;
1386
1387 skb_queue_purge(&st->l2.ui_queue);
1388 st->l2.tei = -1;
1389 FsmChangeState(fi, ST_L2_1);
1390 }
1391
1392 static void
1393 l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
1394 {
1395 struct PStack *st = fi->userdata;
1396
1397 skb_queue_purge(&st->l2.ui_queue);
1398 st->l2.tei = -1;
1399 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1400 FsmChangeState(fi, ST_L2_1);
1401 }
1402
1403 static void
1404 l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
1405 {
1406 struct PStack *st = fi->userdata;
1407
1408 skb_queue_purge(&st->l2.i_queue);
1409 skb_queue_purge(&st->l2.ui_queue);
1410 freewin(st);
1411 st->l2.tei = -1;
1412 stop_t200(st, 17);
1413 st5_dl_release_l2l3(st);
1414 FsmChangeState(fi, ST_L2_1);
1415 }
1416
1417 static void
1418 l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
1419 {
1420 struct PStack *st = fi->userdata;
1421
1422 skb_queue_purge(&st->l2.ui_queue);
1423 st->l2.tei = -1;
1424 stop_t200(st, 18);
1425 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
1426 FsmChangeState(fi, ST_L2_1);
1427 }
1428
1429 static void
1430 l2_tei_remove(struct FsmInst *fi, int event, void *arg)
1431 {
1432 struct PStack *st = fi->userdata;
1433
1434 skb_queue_purge(&st->l2.i_queue);
1435 skb_queue_purge(&st->l2.ui_queue);
1436 freewin(st);
1437 st->l2.tei = -1;
1438 stop_t200(st, 17);
1439 FsmDelTimer(&st->l2.t203, 19);
1440 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1441 FsmChangeState(fi, ST_L2_1);
1442 }
1443
1444 static void
1445 l2_st14_persistent_da(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 if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
1452 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1453 }
1454
1455 static void
1456 l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg)
1457 {
1458 struct PStack *st = fi->userdata;
1459
1460 skb_queue_purge(&st->l2.i_queue);
1461 skb_queue_purge(&st->l2.ui_queue);
1462 freewin(st);
1463 stop_t200(st, 19);
1464 st5_dl_release_l2l3(st);
1465 FsmChangeState(fi, ST_L2_4);
1466 }
1467
1468 static void
1469 l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg)
1470 {
1471 struct PStack *st = fi->userdata;
1472
1473 skb_queue_purge(&st->l2.ui_queue);
1474 stop_t200(st, 20);
1475 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
1476 FsmChangeState(fi, ST_L2_4);
1477 }
1478
1479 static void
1480 l2_persistent_da(struct FsmInst *fi, int event, void *arg)
1481 {
1482 struct PStack *st = fi->userdata;
1483
1484 skb_queue_purge(&st->l2.i_queue);
1485 skb_queue_purge(&st->l2.ui_queue);
1486 freewin(st);
1487 stop_t200(st, 19);
1488 FsmDelTimer(&st->l2.t203, 19);
1489 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1490 FsmChangeState(fi, ST_L2_4);
1491 }
1492
1493 static void
1494 l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
1495 {
1496 struct PStack *st = fi->userdata;
1497
1498 if(!test_and_set_bit(FLG_OWN_BUSY, &st->l2.flag)) {
1499 enquiry_cr(st, RNR, RSP, 0);
1500 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1501 }
1502 }
1503
1504 static void
1505 l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
1506 {
1507 struct PStack *st = fi->userdata;
1508
1509 if(!test_and_clear_bit(FLG_OWN_BUSY, &st->l2.flag)) {
1510 enquiry_cr(st, RR, RSP, 0);
1511 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1512 }
1513 }
1514
1515 static void
1516 l2_frame_error(struct FsmInst *fi, int event, void *arg)
1517 {
1518 struct PStack *st = fi->userdata;
1519
1520 st->ma.layer(st, MDL_ERROR | INDICATION, arg);
1521 }
1522
1523 static void
1524 l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
1525 {
1526 struct PStack *st = fi->userdata;
1527
1528 st->ma.layer(st, MDL_ERROR | INDICATION, arg);
1529 establishlink(fi);
1530 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1531 }
1532
1533 static struct FsmNode L2FnList[] __initdata =
1534 {
1535 {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
1536 {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
1537 {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
1538 {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
1539 {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1540 {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1541 {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
1542 {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
1543 {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1544 {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1545 {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
1546 {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
1547 {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
1548 {ST_L2_1, EV_L2_DL_UNIT_DATA, l2_queue_ui_assign},
1549 {ST_L2_2, EV_L2_DL_UNIT_DATA, l2_queue_ui},
1550 {ST_L2_3, EV_L2_DL_UNIT_DATA, l2_queue_ui},
1551 {ST_L2_4, EV_L2_DL_UNIT_DATA, l2_send_ui},
1552 {ST_L2_5, EV_L2_DL_UNIT_DATA, l2_send_ui},
1553 {ST_L2_6, EV_L2_DL_UNIT_DATA, l2_send_ui},
1554 {ST_L2_7, EV_L2_DL_UNIT_DATA, l2_send_ui},
1555 {ST_L2_8, EV_L2_DL_UNIT_DATA, l2_send_ui},
1556 {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
1557 {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
1558 {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
1559 {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
1560 {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
1561 {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
1562 {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
1563 {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
1564 {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
1565 {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
1566 {ST_L2_4, EV_L2_SABME, l2_start_multi},
1567 {ST_L2_5, EV_L2_SABME, l2_send_UA},
1568 {ST_L2_6, EV_L2_SABME, l2_send_DM},
1569 {ST_L2_7, EV_L2_SABME, l2_restart_multi},
1570 {ST_L2_8, EV_L2_SABME, l2_restart_multi},
1571 {ST_L2_4, EV_L2_DISC, l2_send_DM},
1572 {ST_L2_5, EV_L2_DISC, l2_send_DM},
1573 {ST_L2_6, EV_L2_DISC, l2_send_UA},
1574 {ST_L2_7, EV_L2_DISC, l2_stop_multi},
1575 {ST_L2_8, EV_L2_DISC, l2_stop_multi},
1576 {ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
1577 {ST_L2_5, EV_L2_UA, l2_connected},
1578 {ST_L2_6, EV_L2_UA, l2_released},
1579 {ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
1580 {ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
1581 {ST_L2_4, EV_L2_DM, l2_reestablish},
1582 {ST_L2_5, EV_L2_DM, l2_st5_dm_release},
1583 {ST_L2_6, EV_L2_DM, l2_st6_dm_release},
1584 {ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
1585 {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
1586 {ST_L2_1, EV_L2_UI, l2_got_ui},
1587 {ST_L2_2, EV_L2_UI, l2_got_ui},
1588 {ST_L2_3, EV_L2_UI, l2_got_ui},
1589 {ST_L2_4, EV_L2_UI, l2_got_ui},
1590 {ST_L2_5, EV_L2_UI, l2_got_ui},
1591 {ST_L2_6, EV_L2_UI, l2_got_ui},
1592 {ST_L2_7, EV_L2_UI, l2_got_ui},
1593 {ST_L2_8, EV_L2_UI, l2_got_ui},
1594 {ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
1595 {ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
1596 {ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
1597 {ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
1598 {ST_L2_7, EV_L2_I, l2_got_iframe},
1599 {ST_L2_8, EV_L2_I, l2_got_iframe},
1600 {ST_L2_5, EV_L2_T200, l2_st5_tout_200},
1601 {ST_L2_6, EV_L2_T200, l2_st6_tout_200},
1602 {ST_L2_7, EV_L2_T200, l2_st7_tout_200},
1603 {ST_L2_8, EV_L2_T200, l2_st8_tout_200},
1604 {ST_L2_7, EV_L2_T203, l2_st7_tout_203},
1605 {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
1606 {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1607 {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1608 {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1609 {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1610 {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
1611 {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
1612 {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
1613 {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1614 {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1615 {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1616 {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
1617 {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
1618 {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1619 {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da},
1620 {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da},
1621 {ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da},
1622 {ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da},
1623 };
1624
1625 static void
1626 isdnl2_l1l2(struct PStack *st, int pr, void *arg)
1627 {
1628 struct sk_buff *skb = arg;
1629 u_char *datap;
1630 int ret = 1, len;
1631 int c = 0;
1632
1633 switch (pr) {
1634 case (PH_DATA | INDICATION):
1635 datap = skb->data;
1636 len = l2addrsize(&st->l2);
1637 if (skb->len > len)
1638 datap += len;
1639 else {
1640 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'N');
1641 dev_kfree_skb(skb);
1642 return;
1643 }
1644 if (!(*datap & 1)) { /* I-Frame */
1645 if(!(c = iframe_error(st, skb)))
1646 ret = FsmEvent(&st->l2.l2m, EV_L2_I, skb);
1647 } else if (IsSFrame(datap, st)) { /* S-Frame */
1648 if(!(c = super_error(st, skb)))
1649 ret = FsmEvent(&st->l2.l2m, EV_L2_SUPER, skb);
1650 } else if (IsUI(datap)) {
1651 if(!(c = UI_error(st, skb)))
1652 ret = FsmEvent(&st->l2.l2m, EV_L2_UI, skb);
1653 } else if (IsSABME(datap, st)) {
1654 if(!(c = unnum_error(st, skb, CMD)))
1655 ret = FsmEvent(&st->l2.l2m, EV_L2_SABME, skb);
1656 } else if (IsUA(datap)) {
1657 if(!(c = unnum_error(st, skb, RSP)))
1658 ret = FsmEvent(&st->l2.l2m, EV_L2_UA, skb);
1659 } else if (IsDISC(datap)) {
1660 if(!(c = unnum_error(st, skb, CMD)))
1661 ret = FsmEvent(&st->l2.l2m, EV_L2_DISC, skb);
1662 } else if (IsDM(datap)) {
1663 if(!(c = unnum_error(st, skb, RSP)))
1664 ret = FsmEvent(&st->l2.l2m, EV_L2_DM, skb);
1665 } else if (IsFRMR(datap)) {
1666 if(!(c = FRMR_error(st,skb)))
1667 ret = FsmEvent(&st->l2.l2m, EV_L2_FRMR, skb);
1668 } else {
1669 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'L');
1670 dev_kfree_skb(skb);
1671 ret = 0;
1672 }
1673 if(c) {
1674 dev_kfree_skb(skb);
1675 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
1676 ret = 0;
1677 }
1678 if (ret)
1679 dev_kfree_skb(skb);
1680 break;
1681 case (PH_PULL | CONFIRM):
1682 FsmEvent(&st->l2.l2m, EV_L2_ACK_PULL, arg);
1683 break;
1684 case (PH_PAUSE | INDICATION):
1685 test_and_set_bit(FLG_DCHAN_BUSY, &st->l2.flag);
1686 break;
1687 case (PH_PAUSE | CONFIRM):
1688 test_and_clear_bit(FLG_DCHAN_BUSY, &st->l2.flag);
1689 break;
1690 case (PH_ACTIVATE | CONFIRM):
1691 case (PH_ACTIVATE | INDICATION):
1692 test_and_set_bit(FLG_L1_ACTIV, &st->l2.flag);
1693 if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
1694 FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
1695 break;
1696 case (PH_DEACTIVATE | INDICATION):
1697 case (PH_DEACTIVATE | CONFIRM):
1698 test_and_clear_bit(FLG_L1_ACTIV, &st->l2.flag);
1699 FsmEvent(&st->l2.l2m, EV_L1_DEACTIVATE, arg);
1700 break;
1701 default:
1702 l2m_debug(&st->l2.l2m, "l2 unknown pr %04x", pr);
1703 break;
1704 }
1705 }
1706
1707 static void
1708 isdnl2_l3l2(struct PStack *st, int pr, void *arg)
1709 {
1710 switch (pr) {
1711 case (DL_DATA | REQUEST):
1712 if (FsmEvent(&st->l2.l2m, EV_L2_DL_DATA, arg)) {
1713 dev_kfree_skb((struct sk_buff *) arg);
1714 }
1715 break;
1716 case (DL_UNIT_DATA | REQUEST):
1717 if (FsmEvent(&st->l2.l2m, EV_L2_DL_UNIT_DATA, arg)) {
1718 dev_kfree_skb((struct sk_buff *) arg);
1719 }
1720 break;
1721 case (DL_ESTABLISH | REQUEST):
1722 if (test_bit(FLG_L1_ACTIV, &st->l2.flag)) {
1723 if (test_bit(FLG_LAPD, &st->l2.flag) ||
1724 test_bit(FLG_ORIG, &st->l2.flag)) {
1725 FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
1726 }
1727 } else {
1728 if (test_bit(FLG_LAPD, &st->l2.flag) ||
1729 test_bit(FLG_ORIG, &st->l2.flag)) {
1730 test_and_set_bit(FLG_ESTAB_PEND, &st->l2.flag);
1731 }
1732 st->l2.l2l1(st, PH_ACTIVATE, NULL);
1733 }
1734 break;
1735 case (DL_RELEASE | REQUEST):
1736 if (test_bit(FLG_LAPB, &st->l2.flag)) {
1737 st->l2.l2l1(st, PH_DEACTIVATE, NULL);
1738 }
1739 FsmEvent(&st->l2.l2m, EV_L2_DL_RELEASE_REQ, arg);
1740 break;
1741 case (MDL_ASSIGN | REQUEST):
1742 FsmEvent(&st->l2.l2m, EV_L2_MDL_ASSIGN, arg);
1743 break;
1744 case (MDL_REMOVE | REQUEST):
1745 FsmEvent(&st->l2.l2m, EV_L2_MDL_REMOVE, arg);
1746 break;
1747 case (MDL_ERROR | RESPONSE):
1748 FsmEvent(&st->l2.l2m, EV_L2_MDL_ERROR, arg);
1749 break;
1750 }
1751 }
1752
1753 void
1754 releasestack_isdnl2(struct PStack *st)
1755 {
1756 FsmDelTimer(&st->l2.t200, 21);
1757 FsmDelTimer(&st->l2.t203, 16);
1758 skb_queue_purge(&st->l2.i_queue);
1759 skb_queue_purge(&st->l2.ui_queue);
1760 ReleaseWin(&st->l2);
1761 }
1762
1763 static void
1764 l2m_debug(struct FsmInst *fi, char *fmt, ...)
1765 {
1766 va_list args;
1767 struct PStack *st = fi->userdata;
1768
1769 va_start(args, fmt);
1770 VHiSax_putstatus(st->l1.hardware, st->l2.debug_id, fmt, args);
1771 va_end(args);
1772 }
1773
1774 void
1775 setstack_isdnl2(struct PStack *st, char *debug_id)
1776 {
1777 spin_lock_init(&st->l2.lock);
1778 st->l1.l1l2 = isdnl2_l1l2;
1779 st->l3.l3l2 = isdnl2_l3l2;
1780
1781 skb_queue_head_init(&st->l2.i_queue);
1782 skb_queue_head_init(&st->l2.ui_queue);
1783 InitWin(&st->l2);
1784 st->l2.debug = 0;
1785
1786 st->l2.l2m.fsm = &l2fsm;
1787 if (test_bit(FLG_LAPB, &st->l2.flag))
1788 st->l2.l2m.state = ST_L2_4;
1789 else
1790 st->l2.l2m.state = ST_L2_1;
1791 st->l2.l2m.debug = 0;
1792 st->l2.l2m.userdata = st;
1793 st->l2.l2m.userint = 0;
1794 st->l2.l2m.printdebug = l2m_debug;
1795 strcpy(st->l2.debug_id, debug_id);
1796
1797 FsmInitTimer(&st->l2.l2m, &st->l2.t200);
1798 FsmInitTimer(&st->l2.l2m, &st->l2.t203);
1799 }
1800
1801 static void
1802 transl2_l3l2(struct PStack *st, int pr, void *arg)
1803 {
1804 switch (pr) {
1805 case (DL_DATA | REQUEST):
1806 case (DL_UNIT_DATA | REQUEST):
1807 st->l2.l2l1(st, PH_DATA | REQUEST, arg);
1808 break;
1809 case (DL_ESTABLISH | REQUEST):
1810 st->l2.l2l1(st, PH_ACTIVATE | REQUEST, NULL);
1811 break;
1812 case (DL_RELEASE | REQUEST):
1813 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
1814 break;
1815 }
1816 }
1817
1818 void
1819 setstack_transl2(struct PStack *st)
1820 {
1821 st->l3.l3l2 = transl2_l3l2;
1822 }
1823
1824 void
1825 releasestack_transl2(struct PStack *st)
1826 {
1827 }
1828
1829 int __init
1830 Isdnl2New(void)
1831 {
1832 l2fsm.state_count = L2_STATE_COUNT;
1833 l2fsm.event_count = L2_EVENT_COUNT;
1834 l2fsm.strEvent = strL2Event;
1835 l2fsm.strState = strL2State;
1836 return FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList));
1837 }
1838
1839 void
1840 Isdnl2Free(void)
1841 {
1842 FsmFree(&l2fsm);
1843 }