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18#define __NO_VERSION__
19#include <linux/init.h>
20#include "hisax.h"
21#include "isdnl2.h"
22
23const char *l2_revision = "$Revision: 1.1.4.1 $";
24
25static void l2m_debug(struct FsmInst *fi, char *fmt, ...);
26
27static struct Fsm l2fsm;
28
29enum {
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
42static 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
54enum {
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
81static 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
107static int l2addrsize(struct Layer2 *l2);
108
109static void
110set_peer_busy(struct Layer2 *l2) {
111 test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
112 if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue))
113 test_and_set_bit(FLG_L2BLOCK, &l2->flag);
114}
115
116static void
117clear_peer_busy(struct Layer2 *l2) {
118 if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
119 test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
120}
121
122static void
123InitWin(struct Layer2 *l2)
124{
125 int i;
126
127 for (i = 0; i < MAX_WINDOW; i++)
128 l2->windowar[i] = NULL;
129}
130
131static int
132freewin1(struct Layer2 *l2)
133{
134 int i, cnt = 0;
135
136 for (i = 0; i < MAX_WINDOW; i++) {
137 if (l2->windowar[i]) {
138 cnt++;
139 dev_kfree_skb(l2->windowar[i]);
140 l2->windowar[i] = NULL;
141 }
142 }
143 return cnt;
144}
145
146inline void
147freewin(struct PStack *st)
148{
149 freewin1(&st->l2);
150}
151
152static void
153ReleaseWin(struct Layer2 *l2)
154{
155 int cnt;
156
157 if((cnt = freewin1(l2)))
158 printk(KERN_WARNING "isdl2 freed %d skbuffs in release\n", cnt);
159}
160
161inline unsigned int
162cansend(struct PStack *st)
163{
164 unsigned int p1;
165
166 if(test_bit(FLG_MOD128, &st->l2.flag))
167 p1 = (st->l2.vs - st->l2.va) % 128;
168 else
169 p1 = (st->l2.vs - st->l2.va) % 8;
170 return ((p1 < st->l2.window) && !test_bit(FLG_PEER_BUSY, &st->l2.flag));
171}
172
173inline void
174clear_exception(struct Layer2 *l2)
175{
176 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
177 test_and_clear_bit(FLG_REJEXC, &l2->flag);
178 test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
179 clear_peer_busy(l2);
180}
181
182inline int
183l2headersize(struct Layer2 *l2, int ui)
184{
185 return (((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
186 (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1));
187}
188
189inline int
190l2addrsize(struct Layer2 *l2)
191{
192 return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
193}
194
195static int
196sethdraddr(struct Layer2 *l2, u_char * header, int rsp)
197{
198 u_char *ptr = header;
199 int crbit = rsp;
200
201 if (test_bit(FLG_LAPD, &l2->flag)) {
202 *ptr++ = (l2->sap << 2) | (rsp ? 2 : 0);
203 *ptr++ = (l2->tei << 1) | 1;
204 return (2);
205 } else {
206 if (test_bit(FLG_ORIG, &l2->flag))
207 crbit = !crbit;
208 if (crbit)
209 *ptr++ = 1;
210 else
211 *ptr++ = 3;
212 return (1);
213 }
214}
215
216inline static void
217enqueue_super(struct PStack *st,
218 struct sk_buff *skb)
219{
220 if (test_bit(FLG_LAPB, &st->l2.flag))
221 st->l1.bcs->tx_cnt += skb->len;
222 st->l2.l2l1(st, PH_DATA | REQUEST, skb);
223}
224
225#define enqueue_ui(a, b) enqueue_super(a, b)
226
227inline int
228IsUI(u_char * data)
229{
230 return ((data[0] & 0xef) == UI);
231}
232
233inline int
234IsUA(u_char * data)
235{
236 return ((data[0] & 0xef) == UA);
237}
238
239inline int
240IsDM(u_char * data)
241{
242 return ((data[0] & 0xef) == DM);
243}
244
245inline int
246IsDISC(u_char * data)
247{
248 return ((data[0] & 0xef) == DISC);
249}
250
251inline int
252IsRR(u_char * data, struct PStack *st)
253{
254 if (test_bit(FLG_MOD128, &st->l2.flag))
255 return (data[0] == RR);
256 else
257 return ((data[0] & 0xf) == 1);
258}
259
260inline int
261IsSFrame(u_char * data, struct PStack *st)
262{
263 register u_char d = *data;
264
265 if (!test_bit(FLG_MOD128, &st->l2.flag))
266 d &= 0xf;
267 return(((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c));
268}
269
270inline int
271IsSABME(u_char * data, struct PStack *st)
272{
273 u_char d = data[0] & ~0x10;
274
275 return (test_bit(FLG_MOD128, &st->l2.flag) ? d == SABME : d == SABM);
276}
277
278inline int
279IsREJ(u_char * data, struct PStack *st)
280{
281 return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == REJ : (data[0] & 0xf) == REJ);
282}
283
284inline int
285IsFRMR(u_char * data)
286{
287 return ((data[0] & 0xef) == FRMR);
288}
289
290inline int
291IsRNR(u_char * data, struct PStack *st)
292{
293 return (test_bit(FLG_MOD128, &st->l2.flag) ? data[0] == RNR : (data[0] & 0xf) == RNR);
294}
295
296int
297iframe_error(struct PStack *st, struct sk_buff *skb)
298{
299 int i = l2addrsize(&st->l2) + (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1);
300 int rsp = *skb->data & 0x2;
301
302 if (test_bit(FLG_ORIG, &st->l2.flag))
303 rsp = !rsp;
304
305 if (rsp)
306 return 'L';
307
308
309 if (skb->len < i)
310 return 'N';
311
312 if ((skb->len - i) > st->l2.maxlen)
313 return 'O';
314
315
316 return 0;
317}
318
319int
320super_error(struct PStack *st, struct sk_buff *skb)
321{
322 if (skb->len != l2addrsize(&st->l2) +
323 (test_bit(FLG_MOD128, &st->l2.flag) ? 2 : 1))
324 return 'N';
325
326 return 0;
327}
328
329int
330unnum_error(struct PStack *st, struct sk_buff *skb, int wantrsp)
331{
332 int rsp = (*skb->data & 0x2) >> 1;
333 if (test_bit(FLG_ORIG, &st->l2.flag))
334 rsp = !rsp;
335
336 if (rsp != wantrsp)
337 return 'L';
338
339 if (skb->len != l2addrsize(&st->l2) + 1)
340 return 'N';
341
342 return 0;
343}
344
345int
346UI_error(struct PStack *st, struct sk_buff *skb)
347{
348 int rsp = *skb->data & 0x2;
349 if (test_bit(FLG_ORIG, &st->l2.flag))
350 rsp = !rsp;
351
352 if (rsp)
353 return 'L';
354
355 if (skb->len > st->l2.maxlen + l2addrsize(&st->l2) + 1)
356 return 'O';
357
358 return 0;
359}
360
361int
362FRMR_error(struct PStack *st, struct sk_buff *skb)
363{
364 int headers = l2addrsize(&st->l2) + 1;
365 u_char *datap = skb->data + headers;
366 int rsp = *skb->data & 0x2;
367
368 if (test_bit(FLG_ORIG, &st->l2.flag))
369 rsp = !rsp;
370
371 if (!rsp)
372 return 'L';
373
374 if (test_bit(FLG_MOD128, &st->l2.flag)) {
375 if (skb->len < headers + 5)
376 return 'N';
377 else
378 l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x %2x %2x",
379 datap[0], datap[1], datap[2],
380 datap[3], datap[4]);
381 } else {
382 if (skb->len < headers + 3)
383 return 'N';
384 else
385 l2m_debug(&st->l2.l2m, "FRMR information %2x %2x %2x",
386 datap[0], datap[1], datap[2]);
387 }
388
389 return 0;
390}
391
392static unsigned int
393legalnr(struct PStack *st, unsigned int nr)
394{
395 struct Layer2 *l2 = &st->l2;
396
397 if(test_bit(FLG_MOD128, &l2->flag))
398 return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128);
399 else
400 return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8);
401}
402
403static void
404setva(struct PStack *st, unsigned int nr)
405{
406 struct Layer2 *l2 = &st->l2;
407 int len;
408
409 while (l2->va != nr) {
410 (l2->va)++;
411 if(test_bit(FLG_MOD128, &l2->flag))
412 l2->va %= 128;
413 else
414 l2->va %= 8;
415 len = l2->windowar[l2->sow]->len;
416 if (PACKET_NOACK == l2->windowar[l2->sow]->pkt_type)
417 len = -1;
418 dev_kfree_skb(l2->windowar[l2->sow]);
419 l2->windowar[l2->sow] = NULL;
420 l2->sow = (l2->sow + 1) % l2->window;
421 if (st->lli.l2writewakeup && (len >=0))
422 st->lli.l2writewakeup(st, len);
423 }
424}
425
426static void
427send_uframe(struct PStack *st, u_char cmd, u_char cr)
428{
429 struct sk_buff *skb;
430 u_char tmp[MAX_HEADER_LEN];
431 int i;
432
433 i = sethdraddr(&st->l2, tmp, cr);
434 tmp[i++] = cmd;
435 if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
436 printk(KERN_WARNING "isdl2 can't alloc sbbuff for send_uframe\n");
437 return;
438 }
439 memcpy(skb_put(skb, i), tmp, i);
440 enqueue_super(st, skb);
441}
442
443inline u_char
444get_PollFlag(struct PStack * st, struct sk_buff * skb)
445{
446 return (skb->data[l2addrsize(&(st->l2))] & 0x10);
447}
448
449inline void
450FreeSkb(struct sk_buff *skb)
451{
452 dev_kfree_skb(skb);
453}
454
455
456inline u_char
457get_PollFlagFree(struct PStack *st, struct sk_buff *skb)
458{
459 u_char PF;
460
461 PF = get_PollFlag(st, skb);
462 FreeSkb(skb);
463 return (PF);
464}
465
466inline void
467start_t200(struct PStack *st, int i)
468{
469 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
470 test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
471}
472
473inline void
474restart_t200(struct PStack *st, int i)
475{
476 FsmRestartTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, i);
477 test_and_set_bit(FLG_T200_RUN, &st->l2.flag);
478}
479
480inline void
481stop_t200(struct PStack *st, int i)
482{
483 if(test_and_clear_bit(FLG_T200_RUN, &st->l2.flag))
484 FsmDelTimer(&st->l2.t200, i);
485}
486
487inline void
488st5_dl_release_l2l3(struct PStack *st)
489{
490 int pr;
491
492 if(test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
493 pr = DL_RELEASE | CONFIRM;
494 else
495 pr = DL_RELEASE | INDICATION;
496
497 st->l2.l2l3(st, pr, NULL);
498}
499
500inline void
501lapb_dl_release_l2l3(struct PStack *st, int f)
502{
503 if (test_bit(FLG_LAPB, &st->l2.flag))
504 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
505 st->l2.l2l3(st, DL_RELEASE | f, NULL);
506}
507
508static void
509establishlink(struct FsmInst *fi)
510{
511 struct PStack *st = fi->userdata;
512 u_char cmd;
513
514 clear_exception(&st->l2);
515 st->l2.rc = 0;
516 cmd = (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM) | 0x10;
517 send_uframe(st, cmd, CMD);
518 FsmDelTimer(&st->l2.t203, 1);
519 restart_t200(st, 1);
520 test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
521 freewin(st);
522 FsmChangeState(fi, ST_L2_5);
523}
524
525static void
526l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
527{
528 struct sk_buff *skb = arg;
529 struct PStack *st = fi->userdata;
530
531 if (get_PollFlagFree(st, skb))
532 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'C');
533 else
534 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'D');
535}
536
537static void
538l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
539{
540 struct sk_buff *skb = arg;
541 struct PStack *st = fi->userdata;
542
543 if (get_PollFlagFree(st, skb))
544 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
545 else {
546 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
547 establishlink(fi);
548 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
549 }
550}
551
552static void
553l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
554{
555 struct sk_buff *skb = arg;
556 struct PStack *st = fi->userdata;
557
558 if (get_PollFlagFree(st, skb))
559 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'B');
560 else {
561 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'E');
562 }
563 establishlink(fi);
564 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
565}
566
567static void
568l2_go_st3(struct FsmInst *fi, int event, void *arg)
569{
570 FsmChangeState(fi, ST_L2_3);
571}
572
573static void
574l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
575{
576 struct PStack *st = fi->userdata;
577
578 FsmChangeState(fi, ST_L2_3);
579 st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
580}
581
582static void
583l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
584{
585 struct PStack *st = fi->userdata;
586 struct sk_buff *skb = arg;
587
588 skb_queue_tail(&st->l2.ui_queue, skb);
589 FsmChangeState(fi, ST_L2_2);
590 st->l2.l2tei(st, MDL_ASSIGN | INDICATION, NULL);
591}
592
593static void
594l2_queue_ui(struct FsmInst *fi, int event, void *arg)
595{
596 struct PStack *st = fi->userdata;
597 struct sk_buff *skb = arg;
598
599 skb_queue_tail(&st->l2.ui_queue, skb);
600}
601
602static void
603tx_ui(struct PStack *st)
604{
605 struct sk_buff *skb;
606 u_char header[MAX_HEADER_LEN];
607 int i;
608
609 i = sethdraddr(&(st->l2), header, CMD);
610 header[i++] = UI;
611 while ((skb = skb_dequeue(&st->l2.ui_queue))) {
612 memcpy(skb_push(skb, i), header, i);
613 enqueue_ui(st, skb);
614 }
615}
616
617static void
618l2_send_ui(struct FsmInst *fi, int event, void *arg)
619{
620 struct PStack *st = fi->userdata;
621 struct sk_buff *skb = arg;
622
623 skb_queue_tail(&st->l2.ui_queue, skb);
624 tx_ui(st);
625}
626
627static void
628l2_got_ui(struct FsmInst *fi, int event, void *arg)
629{
630 struct PStack *st = fi->userdata;
631 struct sk_buff *skb = arg;
632
633 skb_pull(skb, l2headersize(&st->l2, 1));
634 st->l2.l2l3(st, DL_UNIT_DATA | INDICATION, skb);
635
636
637
638
639
640}
641
642static void
643l2_establish(struct FsmInst *fi, int event, void *arg)
644{
645 struct PStack *st = fi->userdata;
646
647 establishlink(fi);
648 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
649}
650
651static void
652l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
653{
654 struct PStack *st = fi->userdata;
655
656 skb_queue_purge(&st->l2.i_queue);
657 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
658 test_and_clear_bit(FLG_PEND_REL, &st->l2.flag);
659}
660
661static void
662l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
663{
664 struct PStack *st = fi->userdata;
665
666 skb_queue_purge(&st->l2.i_queue);
667 establishlink(fi);
668 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
669}
670
671static void
672l2_release(struct FsmInst *fi, int event, void *arg)
673{
674 struct PStack *st = fi->userdata;
675
676 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
677}
678
679static void
680l2_pend_rel(struct FsmInst *fi, int event, void *arg)
681{
682 struct PStack *st = fi->userdata;
683
684 test_and_set_bit(FLG_PEND_REL, &st->l2.flag);
685}
686
687static void
688l2_disconnect(struct FsmInst *fi, int event, void *arg)
689{
690 struct PStack *st = fi->userdata;
691
692 skb_queue_purge(&st->l2.i_queue);
693 freewin(st);
694 FsmChangeState(fi, ST_L2_6);
695 st->l2.rc = 0;
696 send_uframe(st, DISC | 0x10, CMD);
697 FsmDelTimer(&st->l2.t203, 1);
698 restart_t200(st, 2);
699}
700
701static void
702l2_start_multi(struct FsmInst *fi, int event, void *arg)
703{
704 struct PStack *st = fi->userdata;
705 struct sk_buff *skb = arg;
706
707 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
708
709 clear_exception(&st->l2);
710 st->l2.vs = 0;
711 st->l2.va = 0;
712 st->l2.vr = 0;
713 st->l2.sow = 0;
714 FsmChangeState(fi, ST_L2_7);
715 FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
716
717 st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
718}
719
720static void
721l2_send_UA(struct FsmInst *fi, int event, void *arg)
722{
723 struct PStack *st = fi->userdata;
724 struct sk_buff *skb = arg;
725
726 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
727}
728
729static void
730l2_send_DM(struct FsmInst *fi, int event, void *arg)
731{
732 struct PStack *st = fi->userdata;
733 struct sk_buff *skb = arg;
734
735 send_uframe(st, DM | get_PollFlagFree(st, skb), RSP);
736}
737
738static void
739l2_restart_multi(struct FsmInst *fi, int event, void *arg)
740{
741 struct PStack *st = fi->userdata;
742 struct sk_buff *skb = arg;
743 int est = 0, state;
744
745 state = fi->state;
746
747 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
748
749 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'F');
750
751 if (st->l2.vs != st->l2.va) {
752 skb_queue_purge(&st->l2.i_queue);
753 est = 1;
754 }
755
756 clear_exception(&st->l2);
757 st->l2.vs = 0;
758 st->l2.va = 0;
759 st->l2.vr = 0;
760 st->l2.sow = 0;
761 FsmChangeState(fi, ST_L2_7);
762 stop_t200(st, 3);
763 FsmRestartTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 3);
764
765 if (est)
766 st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
767
768 if ((ST_L2_7==state) || (ST_L2_8 == state))
769 if (skb_queue_len(&st->l2.i_queue) && cansend(st))
770 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
771}
772
773static void
774l2_stop_multi(struct FsmInst *fi, int event, void *arg)
775{
776 struct PStack *st = fi->userdata;
777 struct sk_buff *skb = arg;
778
779 FsmChangeState(fi, ST_L2_4);
780 FsmDelTimer(&st->l2.t203, 3);
781 stop_t200(st, 4);
782
783 send_uframe(st, UA | get_PollFlagFree(st, skb), RSP);
784
785 skb_queue_purge(&st->l2.i_queue);
786 freewin(st);
787 lapb_dl_release_l2l3(st, INDICATION);
788}
789
790static void
791l2_connected(struct FsmInst *fi, int event, void *arg)
792{
793 struct PStack *st = fi->userdata;
794 struct sk_buff *skb = arg;
795 int pr=-1;
796
797 if (!get_PollFlag(st, skb)) {
798 l2_mdl_error_ua(fi, event, arg);
799 return;
800 }
801 FreeSkb(skb);
802
803 if (test_and_clear_bit(FLG_PEND_REL, &st->l2.flag))
804 l2_disconnect(fi, event, arg);
805
806 if (test_and_clear_bit(FLG_L3_INIT, &st->l2.flag)) {
807 pr = DL_ESTABLISH | CONFIRM;
808 } else if (st->l2.vs != st->l2.va) {
809 skb_queue_purge(&st->l2.i_queue);
810 pr = DL_ESTABLISH | INDICATION;
811 }
812
813 stop_t200(st, 5);
814
815 st->l2.vr = 0;
816 st->l2.vs = 0;
817 st->l2.va = 0;
818 st->l2.sow = 0;
819 FsmChangeState(fi, ST_L2_7);
820 FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 4);
821
822 if (pr != -1)
823 st->l2.l2l3(st, pr, NULL);
824
825 if (skb_queue_len(&st->l2.i_queue) && cansend(st))
826 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
827}
828
829static void
830l2_released(struct FsmInst *fi, int event, void *arg)
831{
832 struct PStack *st = fi->userdata;
833 struct sk_buff *skb = arg;
834
835 if (!get_PollFlag(st, skb)) {
836 l2_mdl_error_ua(fi, event, arg);
837 return;
838 }
839 FreeSkb(skb);
840
841 stop_t200(st, 6);
842 lapb_dl_release_l2l3(st, CONFIRM);
843 FsmChangeState(fi, ST_L2_4);
844}
845
846static void
847l2_reestablish(struct FsmInst *fi, int event, void *arg)
848{
849 struct PStack *st = fi->userdata;
850 struct sk_buff *skb = arg;
851
852 if (!get_PollFlagFree(st, skb)) {
853 establishlink(fi);
854 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
855 }
856}
857
858static void
859l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
860{
861 struct PStack *st = fi->userdata;
862 struct sk_buff *skb = arg;
863
864 if (get_PollFlagFree(st, skb)) {
865 stop_t200(st, 7);
866 if (!test_bit(FLG_L3_INIT, &st->l2.flag))
867 skb_queue_purge(&st->l2.i_queue);
868 if (test_bit(FLG_LAPB, &st->l2.flag))
869 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
870 st5_dl_release_l2l3(st);
871 FsmChangeState(fi, ST_L2_4);
872 }
873}
874
875static void
876l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
877{
878 struct PStack *st = fi->userdata;
879 struct sk_buff *skb = arg;
880
881 if (get_PollFlagFree(st, skb)) {
882 stop_t200(st, 8);
883 lapb_dl_release_l2l3(st, CONFIRM);
884 FsmChangeState(fi, ST_L2_4);
885 }
886}
887
888inline void
889enquiry_cr(struct PStack *st, u_char typ, u_char cr, u_char pf)
890{
891 struct sk_buff *skb;
892 struct Layer2 *l2;
893 u_char tmp[MAX_HEADER_LEN];
894 int i;
895
896 l2 = &st->l2;
897 i = sethdraddr(l2, tmp, cr);
898 if (test_bit(FLG_MOD128, &l2->flag)) {
899 tmp[i++] = typ;
900 tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0);
901 } else
902 tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0);
903 if (!(skb = alloc_skb(i, GFP_ATOMIC))) {
904 printk(KERN_WARNING "isdl2 can't alloc sbbuff for enquiry_cr\n");
905 return;
906 }
907 memcpy(skb_put(skb, i), tmp, i);
908 enqueue_super(st, skb);
909}
910
911inline void
912enquiry_response(struct PStack *st)
913{
914 if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
915 enquiry_cr(st, RNR, RSP, 1);
916 else
917 enquiry_cr(st, RR, RSP, 1);
918 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
919}
920
921inline void
922transmit_enquiry(struct PStack *st)
923{
924 if (test_bit(FLG_OWN_BUSY, &st->l2.flag))
925 enquiry_cr(st, RNR, CMD, 1);
926 else
927 enquiry_cr(st, RR, CMD, 1);
928 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
929 start_t200(st, 9);
930}
931
932
933static void
934nrerrorrecovery(struct FsmInst *fi)
935{
936 struct PStack *st = fi->userdata;
937
938 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'J');
939 establishlink(fi);
940 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
941}
942
943static void
944invoke_retransmission(struct PStack *st, unsigned int nr)
945{
946 struct Layer2 *l2 = &st->l2;
947 unsigned int p1;
948
949 if (l2->vs != nr) {
950 while (l2->vs != nr) {
951 (l2->vs)--;
952 if(test_bit(FLG_MOD128, &l2->flag)) {
953 l2->vs %= 128;
954 p1 = (l2->vs - l2->va) % 128;
955 } else {
956 l2->vs %= 8;
957 p1 = (l2->vs - l2->va) % 8;
958 }
959 p1 = (p1 + l2->sow) % l2->window;
960 if (test_bit(FLG_LAPB, &l2->flag))
961 st->l1.bcs->tx_cnt += l2->windowar[p1]->len + l2headersize(l2, 0);
962 skb_queue_head(&l2->i_queue, l2->windowar[p1]);
963 l2->windowar[p1] = NULL;
964 }
965 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
966 }
967}
968
969static void
970l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
971{
972 struct PStack *st = fi->userdata;
973 struct sk_buff *skb = arg;
974 int PollFlag, rsp, typ = RR;
975 unsigned int nr;
976 struct Layer2 *l2 = &st->l2;
977
978 rsp = *skb->data & 0x2;
979 if (test_bit(FLG_ORIG, &l2->flag))
980 rsp = !rsp;
981
982 skb_pull(skb, l2addrsize(l2));
983 if (IsRNR(skb->data, st)) {
984 set_peer_busy(l2);
985 typ = RNR;
986 } else
987 clear_peer_busy(l2);
988 if (IsREJ(skb->data, st))
989 typ = REJ;
990
991 if (test_bit(FLG_MOD128, &l2->flag)) {
992 PollFlag = (skb->data[1] & 0x1) == 0x1;
993 nr = skb->data[1] >> 1;
994 } else {
995 PollFlag = (skb->data[0] & 0x10);
996 nr = (skb->data[0] >> 5) & 0x7;
997 }
998 FreeSkb(skb);
999
1000 if (PollFlag) {
1001 if (rsp)
1002 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'A');
1003 else
1004 enquiry_response(st);
1005 }
1006 if (legalnr(st, nr)) {
1007 if (typ == REJ) {
1008 setva(st, nr);
1009 invoke_retransmission(st, nr);
1010 stop_t200(st, 10);
1011 if (FsmAddTimer(&st->l2.t203, st->l2.T203,
1012 EV_L2_T203, NULL, 6))
1013 l2m_debug(&st->l2.l2m, "Restart T203 ST7 REJ");
1014 } else if ((nr == l2->vs) && (typ == RR)) {
1015 setva(st, nr);
1016 stop_t200(st, 11);
1017 FsmRestartTimer(&st->l2.t203, st->l2.T203,
1018 EV_L2_T203, NULL, 7);
1019 } else if ((l2->va != nr) || (typ == RNR)) {
1020 setva(st, nr);
1021 if(typ != RR) FsmDelTimer(&st->l2.t203, 9);
1022 restart_t200(st, 12);
1023 }
1024 if (skb_queue_len(&st->l2.i_queue) && (typ == RR))
1025 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1026 } else
1027 nrerrorrecovery(fi);
1028}
1029
1030static void
1031l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg)
1032{
1033 struct PStack *st = fi->userdata;
1034 struct sk_buff *skb = arg;
1035
1036 if (test_bit(FLG_LAPB, &st->l2.flag))
1037 st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
1038 if (!test_bit(FLG_L3_INIT, &st->l2.flag))
1039 skb_queue_tail(&st->l2.i_queue, skb);
1040 else
1041 FreeSkb(skb);
1042}
1043
1044static void
1045l2_feed_i_pull(struct FsmInst *fi, int event, void *arg)
1046{
1047 struct PStack *st = fi->userdata;
1048 struct sk_buff *skb = arg;
1049
1050 if (test_bit(FLG_LAPB, &st->l2.flag))
1051 st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
1052 skb_queue_tail(&st->l2.i_queue, skb);
1053 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1054}
1055
1056static void
1057l2_feed_iqueue(struct FsmInst *fi, int event, void *arg)
1058{
1059 struct PStack *st = fi->userdata;
1060 struct sk_buff *skb = arg;
1061
1062 if (test_bit(FLG_LAPB, &st->l2.flag))
1063 st->l1.bcs->tx_cnt += skb->len + l2headersize(&st->l2, 0);
1064 skb_queue_tail(&st->l2.i_queue, skb);
1065}
1066
1067static void
1068l2_got_iframe(struct FsmInst *fi, int event, void *arg)
1069{
1070 struct PStack *st = fi->userdata;
1071 struct sk_buff *skb = arg;
1072 struct Layer2 *l2 = &(st->l2);
1073 int PollFlag, ns, i;
1074 unsigned int nr;
1075
1076 i = l2addrsize(l2);
1077 if (test_bit(FLG_MOD128, &l2->flag)) {
1078 PollFlag = ((skb->data[i + 1] & 0x1) == 0x1);
1079 ns = skb->data[i] >> 1;
1080 nr = (skb->data[i + 1] >> 1) & 0x7f;
1081 } else {
1082 PollFlag = (skb->data[i] & 0x10);
1083 ns = (skb->data[i] >> 1) & 0x7;
1084 nr = (skb->data[i] >> 5) & 0x7;
1085 }
1086 if (test_bit(FLG_OWN_BUSY, &l2->flag)) {
1087 FreeSkb(skb);
1088 if(PollFlag) enquiry_response(st);
1089 } else if (l2->vr == ns) {
1090 (l2->vr)++;
1091 if(test_bit(FLG_MOD128, &l2->flag))
1092 l2->vr %= 128;
1093 else
1094 l2->vr %= 8;
1095 test_and_clear_bit(FLG_REJEXC, &l2->flag);
1096
1097 if (PollFlag)
1098 enquiry_response(st);
1099 else
1100 test_and_set_bit(FLG_ACK_PEND, &l2->flag);
1101 skb_pull(skb, l2headersize(l2, 0));
1102 st->l2.l2l3(st, DL_DATA | INDICATION, skb);
1103 } else {
1104
1105 FreeSkb(skb);
1106 if (test_and_set_bit(FLG_REJEXC, &l2->flag)) {
1107 if (PollFlag)
1108 enquiry_response(st);
1109 } else {
1110 enquiry_cr(st, REJ, RSP, PollFlag);
1111 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1112 }
1113 }
1114
1115 if (legalnr(st, nr)) {
1116 if (!test_bit(FLG_PEER_BUSY, &st->l2.flag) && (fi->state == ST_L2_7)) {
1117 if (nr == st->l2.vs) {
1118 stop_t200(st, 13);
1119 FsmRestartTimer(&st->l2.t203, st->l2.T203,
1120 EV_L2_T203, NULL, 7);
1121 } else if (nr != st->l2.va)
1122 restart_t200(st, 14);
1123 }
1124 setva(st, nr);
1125 } else {
1126 nrerrorrecovery(fi);
1127 return;
1128 }
1129
1130 if (skb_queue_len(&st->l2.i_queue) && (fi->state == ST_L2_7))
1131 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1132 if (test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag))
1133 enquiry_cr(st, RR, RSP, 0);
1134}
1135
1136static void
1137l2_got_tei(struct FsmInst *fi, int event, void *arg)
1138{
1139 struct PStack *st = fi->userdata;
1140
1141 st->l2.tei = (long) arg;
1142
1143 if (fi->state == ST_L2_3) {
1144 establishlink(fi);
1145 test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
1146 } else
1147 FsmChangeState(fi, ST_L2_4);
1148 if (skb_queue_len(&st->l2.ui_queue))
1149 tx_ui(st);
1150}
1151
1152static void
1153l2_st5_tout_200(struct FsmInst *fi, int event, void *arg)
1154{
1155 struct PStack *st = fi->userdata;
1156
1157 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1158 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1159 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1160 } else if (st->l2.rc == st->l2.N200) {
1161 FsmChangeState(fi, ST_L2_4);
1162 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1163 skb_queue_purge(&st->l2.i_queue);
1164 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'G');
1165 if (test_bit(FLG_LAPB, &st->l2.flag))
1166 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
1167 st5_dl_release_l2l3(st);
1168 } else {
1169 st->l2.rc++;
1170 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1171 send_uframe(st, (test_bit(FLG_MOD128, &st->l2.flag) ? SABME : SABM)
1172 | 0x10, CMD);
1173 }
1174}
1175
1176static void
1177l2_st6_tout_200(struct FsmInst *fi, int event, void *arg)
1178{
1179 struct PStack *st = fi->userdata;
1180
1181 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1182 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1183 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1184 } else if (st->l2.rc == st->l2.N200) {
1185 FsmChangeState(fi, ST_L2_4);
1186 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1187 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'H');
1188 lapb_dl_release_l2l3(st, CONFIRM);
1189 } else {
1190 st->l2.rc++;
1191 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200,
1192 NULL, 9);
1193 send_uframe(st, DISC | 0x10, CMD);
1194 }
1195}
1196
1197static void
1198l2_st7_tout_200(struct FsmInst *fi, int event, void *arg)
1199{
1200 struct PStack *st = fi->userdata;
1201
1202 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1203 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1204 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1205 return;
1206 }
1207 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1208 st->l2.rc = 0;
1209 FsmChangeState(fi, ST_L2_8);
1210
1211 transmit_enquiry(st);
1212 st->l2.rc++;
1213}
1214
1215static void
1216l2_st8_tout_200(struct FsmInst *fi, int event, void *arg)
1217{
1218 struct PStack *st = fi->userdata;
1219
1220 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1221 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1222 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 9);
1223 return;
1224 }
1225 test_and_clear_bit(FLG_T200_RUN, &st->l2.flag);
1226 if (st->l2.rc == st->l2.N200) {
1227 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'I');
1228 establishlink(fi);
1229 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1230 } else {
1231 transmit_enquiry(st);
1232 st->l2.rc++;
1233 }
1234}
1235
1236static void
1237l2_st7_tout_203(struct FsmInst *fi, int event, void *arg)
1238{
1239 struct PStack *st = fi->userdata;
1240
1241 if (test_bit(FLG_LAPD, &st->l2.flag) &&
1242 test_bit(FLG_DCHAN_BUSY, &st->l2.flag)) {
1243 FsmAddTimer(&st->l2.t203, st->l2.T203, EV_L2_T203, NULL, 9);
1244 return;
1245 }
1246 FsmChangeState(fi, ST_L2_8);
1247 transmit_enquiry(st);
1248 st->l2.rc = 0;
1249}
1250
1251static void
1252l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
1253{
1254 struct PStack *st = fi->userdata;
1255 struct sk_buff *skb, *oskb;
1256 struct Layer2 *l2 = &st->l2;
1257 u_char header[MAX_HEADER_LEN];
1258 int i;
1259 int unsigned p1;
1260 long flags;
1261
1262 if (!cansend(st))
1263 return;
1264
1265 skb = skb_dequeue(&l2->i_queue);
1266 if (!skb)
1267 return;
1268
1269 save_flags(flags);
1270 cli();
1271 if(test_bit(FLG_MOD128, &l2->flag))
1272 p1 = (l2->vs - l2->va) % 128;
1273 else
1274 p1 = (l2->vs - l2->va) % 8;
1275 p1 = (p1 + l2->sow) % l2->window;
1276 if (l2->windowar[p1]) {
1277 printk(KERN_WARNING "isdnl2 try overwrite ack queue entry %d\n",
1278 p1);
1279 dev_kfree_skb(l2->windowar[p1]);
1280 }
1281 l2->windowar[p1] = skb_clone(skb, GFP_ATOMIC);
1282
1283 i = sethdraddr(&st->l2, header, CMD);
1284
1285 if (test_bit(FLG_MOD128, &l2->flag)) {
1286 header[i++] = l2->vs << 1;
1287 header[i++] = l2->vr << 1;
1288 l2->vs = (l2->vs + 1) % 128;
1289 } else {
1290 header[i++] = (l2->vr << 5) | (l2->vs << 1);
1291 l2->vs = (l2->vs + 1) % 8;
1292 }
1293 restore_flags(flags);
1294
1295 p1 = skb->data - skb->head;
1296 if (p1 >= i)
1297 memcpy(skb_push(skb, i), header, i);
1298 else {
1299 printk(KERN_WARNING
1300 "isdl2 pull_iqueue skb header(%d/%d) too short\n", i, p1);
1301 oskb = skb;
1302 skb = alloc_skb(oskb->len + i, GFP_ATOMIC);
1303 memcpy(skb_put(skb, i), header, i);
1304 memcpy(skb_put(skb, oskb->len), oskb->data, oskb->len);
1305 FreeSkb(oskb);
1306 }
1307 st->l2.l2l1(st, PH_PULL | INDICATION, skb);
1308 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1309 if (!test_and_set_bit(FLG_T200_RUN, &st->l2.flag)) {
1310 FsmDelTimer(&st->l2.t203, 13);
1311 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11);
1312 }
1313 if (skb_queue_len(&l2->i_queue) && cansend(st))
1314 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1315}
1316
1317static void
1318l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
1319{
1320 struct PStack *st = fi->userdata;
1321 struct sk_buff *skb = arg;
1322 int PollFlag, rsp, rnr = 0;
1323 unsigned int nr;
1324 struct Layer2 *l2 = &st->l2;
1325
1326 rsp = *skb->data & 0x2;
1327 if (test_bit(FLG_ORIG, &l2->flag))
1328 rsp = !rsp;
1329
1330 skb_pull(skb, l2addrsize(l2));
1331
1332 if (IsRNR(skb->data, st)) {
1333 set_peer_busy(l2);
1334 rnr = 1;
1335 } else
1336 clear_peer_busy(l2);
1337
1338 if (test_bit(FLG_MOD128, &l2->flag)) {
1339 PollFlag = (skb->data[1] & 0x1) == 0x1;
1340 nr = skb->data[1] >> 1;
1341 } else {
1342 PollFlag = (skb->data[0] & 0x10);
1343 nr = (skb->data[0] >> 5) & 0x7;
1344 }
1345 FreeSkb(skb);
1346
1347 if (rsp && PollFlag) {
1348 if (legalnr(st, nr)) {
1349 if (rnr) {
1350 restart_t200(st, 15);
1351 } else {
1352 stop_t200(st, 16);
1353 FsmAddTimer(&l2->t203, l2->T203,
1354 EV_L2_T203, NULL, 5);
1355 setva(st, nr);
1356 }
1357 invoke_retransmission(st, nr);
1358 FsmChangeState(fi, ST_L2_7);
1359 if (skb_queue_len(&l2->i_queue) && cansend(st))
1360 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1361 } else
1362 nrerrorrecovery(fi);
1363 } else {
1364 if (!rsp && PollFlag)
1365 enquiry_response(st);
1366 if (legalnr(st, nr)) {
1367 setva(st, nr);
1368 } else
1369 nrerrorrecovery(fi);
1370 }
1371}
1372
1373static void
1374l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
1375{
1376 struct PStack *st = fi->userdata;
1377 struct sk_buff *skb = arg;
1378
1379 skb_pull(skb, l2addrsize(&st->l2) + 1);
1380
1381 if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) ||
1382 (IsUA(skb->data) && (fi->state == ST_L2_7))) {
1383 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'K');
1384 establishlink(fi);
1385 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1386 }
1387 FreeSkb(skb);
1388}
1389
1390static void
1391l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
1392{
1393 struct PStack *st = fi->userdata;
1394
1395 skb_queue_purge(&st->l2.ui_queue);
1396 st->l2.tei = -1;
1397 FsmChangeState(fi, ST_L2_1);
1398}
1399
1400static void
1401l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
1402{
1403 struct PStack *st = fi->userdata;
1404
1405 skb_queue_purge(&st->l2.ui_queue);
1406 st->l2.tei = -1;
1407 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1408 FsmChangeState(fi, ST_L2_1);
1409}
1410
1411static void
1412l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
1413{
1414 struct PStack *st = fi->userdata;
1415
1416 skb_queue_purge(&st->l2.i_queue);
1417 skb_queue_purge(&st->l2.ui_queue);
1418 freewin(st);
1419 st->l2.tei = -1;
1420 stop_t200(st, 17);
1421 st5_dl_release_l2l3(st);
1422 FsmChangeState(fi, ST_L2_1);
1423}
1424
1425static void
1426l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
1427{
1428 struct PStack *st = fi->userdata;
1429
1430 skb_queue_purge(&st->l2.ui_queue);
1431 st->l2.tei = -1;
1432 stop_t200(st, 18);
1433 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
1434 FsmChangeState(fi, ST_L2_1);
1435}
1436
1437static void
1438l2_tei_remove(struct FsmInst *fi, int event, void *arg)
1439{
1440 struct PStack *st = fi->userdata;
1441
1442 skb_queue_purge(&st->l2.i_queue);
1443 skb_queue_purge(&st->l2.ui_queue);
1444 freewin(st);
1445 st->l2.tei = -1;
1446 stop_t200(st, 17);
1447 FsmDelTimer(&st->l2.t203, 19);
1448 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1449 FsmChangeState(fi, ST_L2_1);
1450}
1451
1452static void
1453l2_st14_persistant_da(struct FsmInst *fi, int event, void *arg)
1454{
1455 struct PStack *st = fi->userdata;
1456
1457 skb_queue_purge(&st->l2.i_queue);
1458 skb_queue_purge(&st->l2.ui_queue);
1459 if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
1460 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1461}
1462
1463static void
1464l2_st5_persistant_da(struct FsmInst *fi, int event, void *arg)
1465{
1466 struct PStack *st = fi->userdata;
1467
1468 skb_queue_purge(&st->l2.i_queue);
1469 skb_queue_purge(&st->l2.ui_queue);
1470 freewin(st);
1471 stop_t200(st, 19);
1472 st5_dl_release_l2l3(st);
1473 FsmChangeState(fi, ST_L2_4);
1474}
1475
1476static void
1477l2_st6_persistant_da(struct FsmInst *fi, int event, void *arg)
1478{
1479 struct PStack *st = fi->userdata;
1480
1481 skb_queue_purge(&st->l2.ui_queue);
1482 stop_t200(st, 20);
1483 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
1484 FsmChangeState(fi, ST_L2_4);
1485}
1486
1487static void
1488l2_persistant_da(struct FsmInst *fi, int event, void *arg)
1489{
1490 struct PStack *st = fi->userdata;
1491
1492 skb_queue_purge(&st->l2.i_queue);
1493 skb_queue_purge(&st->l2.ui_queue);
1494 freewin(st);
1495 stop_t200(st, 19);
1496 FsmDelTimer(&st->l2.t203, 19);
1497 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1498 FsmChangeState(fi, ST_L2_4);
1499}
1500
1501static void
1502l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
1503{
1504 struct PStack *st = fi->userdata;
1505
1506 if(!test_and_set_bit(FLG_OWN_BUSY, &st->l2.flag)) {
1507 enquiry_cr(st, RNR, RSP, 0);
1508 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1509 }
1510}
1511
1512static void
1513l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
1514{
1515 struct PStack *st = fi->userdata;
1516
1517 if(!test_and_clear_bit(FLG_OWN_BUSY, &st->l2.flag)) {
1518 enquiry_cr(st, RR, RSP, 0);
1519 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1520 }
1521}
1522
1523static void
1524l2_frame_error(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}
1530
1531static void
1532l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
1533{
1534 struct PStack *st = fi->userdata;
1535
1536 st->ma.layer(st, MDL_ERROR | INDICATION, arg);
1537 establishlink(fi);
1538 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1539}
1540
1541static struct FsmNode L2FnList[] __initdata =
1542{
1543 {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
1544 {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
1545 {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
1546 {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
1547 {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1548 {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1549 {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
1550 {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
1551 {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1552 {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1553 {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
1554 {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
1555 {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
1556 {ST_L2_1, EV_L2_DL_UNIT_DATA, l2_queue_ui_assign},
1557 {ST_L2_2, EV_L2_DL_UNIT_DATA, l2_queue_ui},
1558 {ST_L2_3, EV_L2_DL_UNIT_DATA, l2_queue_ui},
1559 {ST_L2_4, EV_L2_DL_UNIT_DATA, l2_send_ui},
1560 {ST_L2_5, EV_L2_DL_UNIT_DATA, l2_send_ui},
1561 {ST_L2_6, EV_L2_DL_UNIT_DATA, l2_send_ui},
1562 {ST_L2_7, EV_L2_DL_UNIT_DATA, l2_send_ui},
1563 {ST_L2_8, EV_L2_DL_UNIT_DATA, l2_send_ui},
1564 {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
1565 {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
1566 {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
1567 {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
1568 {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
1569 {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
1570 {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
1571 {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
1572 {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
1573 {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
1574 {ST_L2_4, EV_L2_SABME, l2_start_multi},
1575 {ST_L2_5, EV_L2_SABME, l2_send_UA},
1576 {ST_L2_6, EV_L2_SABME, l2_send_DM},
1577 {ST_L2_7, EV_L2_SABME, l2_restart_multi},
1578 {ST_L2_8, EV_L2_SABME, l2_restart_multi},
1579 {ST_L2_4, EV_L2_DISC, l2_send_DM},
1580 {ST_L2_5, EV_L2_DISC, l2_send_DM},
1581 {ST_L2_6, EV_L2_DISC, l2_send_UA},
1582 {ST_L2_7, EV_L2_DISC, l2_stop_multi},
1583 {ST_L2_8, EV_L2_DISC, l2_stop_multi},
1584 {ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
1585 {ST_L2_5, EV_L2_UA, l2_connected},
1586 {ST_L2_6, EV_L2_UA, l2_released},
1587 {ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
1588 {ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
1589 {ST_L2_4, EV_L2_DM, l2_reestablish},
1590 {ST_L2_5, EV_L2_DM, l2_st5_dm_release},
1591 {ST_L2_6, EV_L2_DM, l2_st6_dm_release},
1592 {ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
1593 {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
1594 {ST_L2_1, EV_L2_UI, l2_got_ui},
1595 {ST_L2_2, EV_L2_UI, l2_got_ui},
1596 {ST_L2_3, EV_L2_UI, l2_got_ui},
1597 {ST_L2_4, EV_L2_UI, l2_got_ui},
1598 {ST_L2_5, EV_L2_UI, l2_got_ui},
1599 {ST_L2_6, EV_L2_UI, l2_got_ui},
1600 {ST_L2_7, EV_L2_UI, l2_got_ui},
1601 {ST_L2_8, EV_L2_UI, l2_got_ui},
1602 {ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
1603 {ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
1604 {ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
1605 {ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
1606 {ST_L2_7, EV_L2_I, l2_got_iframe},
1607 {ST_L2_8, EV_L2_I, l2_got_iframe},
1608 {ST_L2_5, EV_L2_T200, l2_st5_tout_200},
1609 {ST_L2_6, EV_L2_T200, l2_st6_tout_200},
1610 {ST_L2_7, EV_L2_T200, l2_st7_tout_200},
1611 {ST_L2_8, EV_L2_T200, l2_st8_tout_200},
1612 {ST_L2_7, EV_L2_T203, l2_st7_tout_203},
1613 {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
1614 {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1615 {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1616 {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1617 {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1618 {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
1619 {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
1620 {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
1621 {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1622 {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1623 {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistant_da},
1624 {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
1625 {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
1626 {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistant_da},
1627 {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistant_da},
1628 {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistant_da},
1629 {ST_L2_7, EV_L1_DEACTIVATE, l2_persistant_da},
1630 {ST_L2_8, EV_L1_DEACTIVATE, l2_persistant_da},
1631};
1632
1633#define L2_FN_COUNT (sizeof(L2FnList)/sizeof(struct FsmNode))
1634
1635static void
1636isdnl2_l1l2(struct PStack *st, int pr, void *arg)
1637{
1638 struct sk_buff *skb = arg;
1639 u_char *datap;
1640 int ret = 1, len;
1641 int c = 0;
1642
1643 switch (pr) {
1644 case (PH_DATA | INDICATION):
1645 datap = skb->data;
1646 len = l2addrsize(&st->l2);
1647 if (skb->len > len)
1648 datap += len;
1649 else {
1650 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'N');
1651 FreeSkb(skb);
1652 return;
1653 }
1654 if (!(*datap & 1)) {
1655 if(!(c = iframe_error(st, skb)))
1656 ret = FsmEvent(&st->l2.l2m, EV_L2_I, skb);
1657 } else if (IsSFrame(datap, st)) {
1658 if(!(c = super_error(st, skb)))
1659 ret = FsmEvent(&st->l2.l2m, EV_L2_SUPER, skb);
1660 } else if (IsUI(datap)) {
1661 if(!(c = UI_error(st, skb)))
1662 ret = FsmEvent(&st->l2.l2m, EV_L2_UI, skb);
1663 } else if (IsSABME(datap, st)) {
1664 if(!(c = unnum_error(st, skb, CMD)))
1665 ret = FsmEvent(&st->l2.l2m, EV_L2_SABME, skb);
1666 } else if (IsUA(datap)) {
1667 if(!(c = unnum_error(st, skb, RSP)))
1668 ret = FsmEvent(&st->l2.l2m, EV_L2_UA, skb);
1669 } else if (IsDISC(datap)) {
1670 if(!(c = unnum_error(st, skb, CMD)))
1671 ret = FsmEvent(&st->l2.l2m, EV_L2_DISC, skb);
1672 } else if (IsDM(datap)) {
1673 if(!(c = unnum_error(st, skb, RSP)))
1674 ret = FsmEvent(&st->l2.l2m, EV_L2_DM, skb);
1675 } else if (IsFRMR(datap)) {
1676 if(!(c = FRMR_error(st,skb)))
1677 ret = FsmEvent(&st->l2.l2m, EV_L2_FRMR, skb);
1678 } else {
1679 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'L');
1680 FreeSkb(skb);
1681 ret = 0;
1682 }
1683 if(c) {
1684 FreeSkb(skb);
1685 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
1686 ret = 0;
1687 }
1688 if (ret)
1689 FreeSkb(skb);
1690 break;
1691 case (PH_PULL | CONFIRM):
1692 FsmEvent(&st->l2.l2m, EV_L2_ACK_PULL, arg);
1693 break;
1694 case (PH_PAUSE | INDICATION):
1695 test_and_set_bit(FLG_DCHAN_BUSY, &st->l2.flag);
1696 break;
1697 case (PH_PAUSE | CONFIRM):
1698 test_and_clear_bit(FLG_DCHAN_BUSY, &st->l2.flag);
1699 break;
1700 case (PH_ACTIVATE | CONFIRM):
1701 case (PH_ACTIVATE | INDICATION):
1702 test_and_set_bit(FLG_L1_ACTIV, &st->l2.flag);
1703 if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
1704 FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
1705 break;
1706 case (PH_DEACTIVATE | INDICATION):
1707 case (PH_DEACTIVATE | CONFIRM):
1708 test_and_clear_bit(FLG_L1_ACTIV, &st->l2.flag);
1709 FsmEvent(&st->l2.l2m, EV_L1_DEACTIVATE, arg);
1710 break;
1711 default:
1712 l2m_debug(&st->l2.l2m, "l2 unknown pr %04x", pr);
1713 break;
1714 }
1715}
1716
1717static void
1718isdnl2_l3l2(struct PStack *st, int pr, void *arg)
1719{
1720 switch (pr) {
1721 case (DL_DATA | REQUEST):
1722 if (FsmEvent(&st->l2.l2m, EV_L2_DL_DATA, arg)) {
1723 dev_kfree_skb((struct sk_buff *) arg);
1724 }
1725 break;
1726 case (DL_UNIT_DATA | REQUEST):
1727 if (FsmEvent(&st->l2.l2m, EV_L2_DL_UNIT_DATA, arg)) {
1728 dev_kfree_skb((struct sk_buff *) arg);
1729 }
1730 break;
1731 case (DL_ESTABLISH | REQUEST):
1732 if (test_bit(FLG_L1_ACTIV, &st->l2.flag)) {
1733 if (test_bit(FLG_LAPD, &st->l2.flag) ||
1734 test_bit(FLG_ORIG, &st->l2.flag)) {
1735 FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
1736 }
1737 } else {
1738 if (test_bit(FLG_LAPD, &st->l2.flag) ||
1739 test_bit(FLG_ORIG, &st->l2.flag)) {
1740 test_and_set_bit(FLG_ESTAB_PEND, &st->l2.flag);
1741 }
1742 st->l2.l2l1(st, PH_ACTIVATE, NULL);
1743 }
1744 break;
1745 case (DL_RELEASE | REQUEST):
1746 if (test_bit(FLG_LAPB, &st->l2.flag)) {
1747 st->l2.l2l1(st, PH_DEACTIVATE, NULL);
1748 }
1749 FsmEvent(&st->l2.l2m, EV_L2_DL_RELEASE_REQ, arg);
1750 break;
1751 case (MDL_ASSIGN | REQUEST):
1752 FsmEvent(&st->l2.l2m, EV_L2_MDL_ASSIGN, arg);
1753 break;
1754 case (MDL_REMOVE | REQUEST):
1755 FsmEvent(&st->l2.l2m, EV_L2_MDL_REMOVE, arg);
1756 break;
1757 case (MDL_ERROR | RESPONSE):
1758 FsmEvent(&st->l2.l2m, EV_L2_MDL_ERROR, arg);
1759 break;
1760 }
1761}
1762
1763void
1764releasestack_isdnl2(struct PStack *st)
1765{
1766 FsmDelTimer(&st->l2.t200, 21);
1767 FsmDelTimer(&st->l2.t203, 16);
1768 skb_queue_purge(&st->l2.i_queue);
1769 skb_queue_purge(&st->l2.ui_queue);
1770 ReleaseWin(&st->l2);
1771}
1772
1773static void
1774l2m_debug(struct FsmInst *fi, char *fmt, ...)
1775{
1776 va_list args;
1777 struct PStack *st = fi->userdata;
1778
1779 va_start(args, fmt);
1780 VHiSax_putstatus(st->l1.hardware, st->l2.debug_id, fmt, args);
1781 va_end(args);
1782}
1783
1784void
1785setstack_isdnl2(struct PStack *st, char *debug_id)
1786{
1787 st->l1.l1l2 = isdnl2_l1l2;
1788 st->l3.l3l2 = isdnl2_l3l2;
1789
1790 skb_queue_head_init(&st->l2.i_queue);
1791 skb_queue_head_init(&st->l2.ui_queue);
1792 InitWin(&st->l2);
1793 st->l2.debug = 0;
1794
1795 st->l2.l2m.fsm = &l2fsm;
1796 if (test_bit(FLG_LAPB, &st->l2.flag))
1797 st->l2.l2m.state = ST_L2_4;
1798 else
1799 st->l2.l2m.state = ST_L2_1;
1800 st->l2.l2m.debug = 0;
1801 st->l2.l2m.userdata = st;
1802 st->l2.l2m.userint = 0;
1803 st->l2.l2m.printdebug = l2m_debug;
1804 strcpy(st->l2.debug_id, debug_id);
1805
1806 FsmInitTimer(&st->l2.l2m, &st->l2.t200);
1807 FsmInitTimer(&st->l2.l2m, &st->l2.t203);
1808}
1809
1810static void
1811transl2_l3l2(struct PStack *st, int pr, void *arg)
1812{
1813 switch (pr) {
1814 case (DL_DATA | REQUEST):
1815 case (DL_UNIT_DATA | REQUEST):
1816 st->l2.l2l1(st, PH_DATA | REQUEST, arg);
1817 break;
1818 case (DL_ESTABLISH | REQUEST):
1819 st->l2.l2l1(st, PH_ACTIVATE | REQUEST, NULL);
1820 break;
1821 case (DL_RELEASE | REQUEST):
1822 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
1823 break;
1824 }
1825}
1826
1827void
1828setstack_transl2(struct PStack *st)
1829{
1830 st->l3.l3l2 = transl2_l3l2;
1831}
1832
1833void
1834releasestack_transl2(struct PStack *st)
1835{
1836}
1837
1838int __init
1839Isdnl2New(void)
1840{
1841 l2fsm.state_count = L2_STATE_COUNT;
1842 l2fsm.event_count = L2_EVENT_COUNT;
1843 l2fsm.strEvent = strL2Event;
1844 l2fsm.strState = strL2State;
1845 return FsmNew(&l2fsm, L2FnList, L2_FN_COUNT);
1846}
1847
1848void
1849Isdnl2Free(void)
1850{
1851 FsmFree(&l2fsm);
1852}
1853
