1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18#include <linux/init.h>
19#include <linux/gfp.h>
20#include "hisax.h"
21#include "isdnl2.h"
22
23const char *l2_revision = "$Revision: 2.30.2.4 $";
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_empty(&l2->i_queue) ||
113 !skb_queue_empty(&l2->ui_queue))
114 test_and_set_bit(FLG_L2BLOCK, &l2->flag);
115}
116
117static void
118clear_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
123static void
124InitWin(struct Layer2 *l2)
125{
126 int i;
127
128 for (i = 0; i < MAX_WINDOW; i++)
129 l2->windowar[i] = NULL;
130}
131
132static int
133freewin1(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
147static inline void
148freewin(struct PStack *st)
149{
150 freewin1(&st->l2);
151}
152
153static void
154ReleaseWin(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
162static inline unsigned int
163cansend(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
174static inline void
175clear_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
183static inline int
184l2headersize(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
190inline int
191l2addrsize(struct Layer2 *l2)
192{
193 return (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
194}
195
196static int
197sethdraddr(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
217static inline void
218enqueue_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
228static inline int
229IsUI(u_char *data)
230{
231 return ((data[0] & 0xef) == UI);
232}
233
234static inline int
235IsUA(u_char *data)
236{
237 return ((data[0] & 0xef) == UA);
238}
239
240static inline int
241IsDM(u_char *data)
242{
243 return ((data[0] & 0xef) == DM);
244}
245
246static inline int
247IsDISC(u_char *data)
248{
249 return ((data[0] & 0xef) == DISC);
250}
251
252static inline int
253IsSFrame(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
262static inline int
263IsSABME(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
270static inline int
271IsREJ(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
276static inline int
277IsFRMR(u_char *data)
278{
279 return ((data[0] & 0xef) == FRMR);
280}
281
282static inline int
283IsRNR(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
288static int
289iframe_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
311static int
312super_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
321static int
322unnum_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
337static int
338UI_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
353static int
354FRMR_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
384static unsigned int
385legalnr(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
395static void
396setva(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
423static void
424send_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 skb_put_data(skb, tmp, i);
437 enqueue_super(st, skb);
438}
439
440static inline u_char
441get_PollFlag(struct PStack *st, struct sk_buff *skb)
442{
443 return (skb->data[l2addrsize(&(st->l2))] & 0x10);
444}
445
446static inline u_char
447get_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
456static inline void
457start_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
463static inline void
464restart_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
470static inline void
471stop_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
477static inline void
478st5_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
490static inline void
491lapb_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
498static void
499establishlink(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
515static void
516l2_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
527static void
528l2_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
542static void
543l2_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
557static void
558l2_go_st3(struct FsmInst *fi, int event, void *arg)
559{
560 FsmChangeState(fi, ST_L2_3);
561}
562
563static void
564l2_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
572static void
573l2_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
583static void
584l2_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
592static void
593tx_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
607static void
608l2_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
617static void
618l2_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
627
628
629
630}
631
632static void
633l2_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
641static void
642l2_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
651static void
652l2_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
661static void
662l2_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
669static void
670l2_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
677static void
678l2_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
691static void
692l2_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
710static void
711l2_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
719static void
720l2_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
728static void
729l2_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
763static void
764l2_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
780static void
781l2_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
819static void
820l2_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
836static void
837l2_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
848static void
849l2_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
865static void
866l2_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
878static inline void
879enquiry_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 skb_put_data(skb, tmp, i);
898 enqueue_super(st, skb);
899}
900
901static inline void
902enquiry_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
911static inline void
912transmit_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
923static void
924nrerrorrecovery(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
933static void
934invoke_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
964static void
965l2_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
1025static void
1026l2_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
1039static void
1040l2_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
1051static void
1052l2_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
1062static void
1063l2_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
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
1131static void
1132l2_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
1147static void
1148l2_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
1171static void
1172l2_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
1192static void
1193l2_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
1210static void
1211l2_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
1231static void
1232l2_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
1246static void
1247l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
1248{
1249 struct PStack *st = fi->userdata;
1250 struct sk_buff *skb, *nskb;
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 nskb = skb_realloc_headroom(skb, hdr_space_needed);
1266 if (!nskb) {
1267 skb_queue_head(&l2->i_queue, skb);
1268 return;
1269 }
1270 spin_lock_irqsave(&l2->lock, flags);
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;
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 spin_unlock_irqrestore(&l2->lock, flags);
1294 memcpy(skb_push(nskb, i), header, i);
1295 st->l2.l2l1(st, PH_PULL | INDICATION, nskb);
1296 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1297 if (!test_and_set_bit(FLG_T200_RUN, &st->l2.flag)) {
1298 FsmDelTimer(&st->l2.t203, 13);
1299 FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11);
1300 }
1301 if (!skb_queue_empty(&l2->i_queue) && cansend(st))
1302 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1303}
1304
1305static void
1306l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
1307{
1308 struct PStack *st = fi->userdata;
1309 struct sk_buff *skb = arg;
1310 int PollFlag, rsp, rnr = 0;
1311 unsigned int nr;
1312 struct Layer2 *l2 = &st->l2;
1313
1314 rsp = *skb->data & 0x2;
1315 if (test_bit(FLG_ORIG, &l2->flag))
1316 rsp = !rsp;
1317
1318 skb_pull(skb, l2addrsize(l2));
1319
1320 if (IsRNR(skb->data, st)) {
1321 set_peer_busy(l2);
1322 rnr = 1;
1323 } else
1324 clear_peer_busy(l2);
1325
1326 if (test_bit(FLG_MOD128, &l2->flag)) {
1327 PollFlag = (skb->data[1] & 0x1) == 0x1;
1328 nr = skb->data[1] >> 1;
1329 } else {
1330 PollFlag = (skb->data[0] & 0x10);
1331 nr = (skb->data[0] >> 5) & 0x7;
1332 }
1333 dev_kfree_skb(skb);
1334
1335 if (rsp && PollFlag) {
1336 if (legalnr(st, nr)) {
1337 if (rnr) {
1338 restart_t200(st, 15);
1339 } else {
1340 stop_t200(st, 16);
1341 FsmAddTimer(&l2->t203, l2->T203,
1342 EV_L2_T203, NULL, 5);
1343 setva(st, nr);
1344 }
1345 invoke_retransmission(st, nr);
1346 FsmChangeState(fi, ST_L2_7);
1347 if (!skb_queue_empty(&l2->i_queue) && cansend(st))
1348 st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
1349 } else
1350 nrerrorrecovery(fi);
1351 } else {
1352 if (!rsp && PollFlag)
1353 enquiry_response(st);
1354 if (legalnr(st, nr)) {
1355 setva(st, nr);
1356 } else
1357 nrerrorrecovery(fi);
1358 }
1359}
1360
1361static void
1362l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
1363{
1364 struct PStack *st = fi->userdata;
1365 struct sk_buff *skb = arg;
1366
1367 skb_pull(skb, l2addrsize(&st->l2) + 1);
1368
1369 if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) ||
1370 (IsUA(skb->data) && (fi->state == ST_L2_7))) {
1371 st->ma.layer(st, MDL_ERROR | INDICATION, (void *) 'K');
1372 establishlink(fi);
1373 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1374 }
1375 dev_kfree_skb(skb);
1376}
1377
1378static void
1379l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
1380{
1381 struct PStack *st = fi->userdata;
1382
1383 skb_queue_purge(&st->l2.ui_queue);
1384 st->l2.tei = -1;
1385 FsmChangeState(fi, ST_L2_1);
1386}
1387
1388static void
1389l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
1390{
1391 struct PStack *st = fi->userdata;
1392
1393 skb_queue_purge(&st->l2.ui_queue);
1394 st->l2.tei = -1;
1395 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1396 FsmChangeState(fi, ST_L2_1);
1397}
1398
1399static void
1400l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
1401{
1402 struct PStack *st = fi->userdata;
1403
1404 skb_queue_purge(&st->l2.i_queue);
1405 skb_queue_purge(&st->l2.ui_queue);
1406 freewin(st);
1407 st->l2.tei = -1;
1408 stop_t200(st, 17);
1409 st5_dl_release_l2l3(st);
1410 FsmChangeState(fi, ST_L2_1);
1411}
1412
1413static void
1414l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
1415{
1416 struct PStack *st = fi->userdata;
1417
1418 skb_queue_purge(&st->l2.ui_queue);
1419 st->l2.tei = -1;
1420 stop_t200(st, 18);
1421 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
1422 FsmChangeState(fi, ST_L2_1);
1423}
1424
1425static void
1426l2_tei_remove(struct FsmInst *fi, int event, void *arg)
1427{
1428 struct PStack *st = fi->userdata;
1429
1430 skb_queue_purge(&st->l2.i_queue);
1431 skb_queue_purge(&st->l2.ui_queue);
1432 freewin(st);
1433 st->l2.tei = -1;
1434 stop_t200(st, 17);
1435 FsmDelTimer(&st->l2.t203, 19);
1436 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1437 FsmChangeState(fi, ST_L2_1);
1438}
1439
1440static void
1441l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg)
1442{
1443 struct PStack *st = fi->userdata;
1444
1445 skb_queue_purge(&st->l2.i_queue);
1446 skb_queue_purge(&st->l2.ui_queue);
1447 if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
1448 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1449}
1450
1451static void
1452l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg)
1453{
1454 struct PStack *st = fi->userdata;
1455
1456 skb_queue_purge(&st->l2.i_queue);
1457 skb_queue_purge(&st->l2.ui_queue);
1458 freewin(st);
1459 stop_t200(st, 19);
1460 st5_dl_release_l2l3(st);
1461 FsmChangeState(fi, ST_L2_4);
1462}
1463
1464static void
1465l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg)
1466{
1467 struct PStack *st = fi->userdata;
1468
1469 skb_queue_purge(&st->l2.ui_queue);
1470 stop_t200(st, 20);
1471 st->l2.l2l3(st, DL_RELEASE | CONFIRM, NULL);
1472 FsmChangeState(fi, ST_L2_4);
1473}
1474
1475static void
1476l2_persistent_da(struct FsmInst *fi, int event, void *arg)
1477{
1478 struct PStack *st = fi->userdata;
1479
1480 skb_queue_purge(&st->l2.i_queue);
1481 skb_queue_purge(&st->l2.ui_queue);
1482 freewin(st);
1483 stop_t200(st, 19);
1484 FsmDelTimer(&st->l2.t203, 19);
1485 st->l2.l2l3(st, DL_RELEASE | INDICATION, NULL);
1486 FsmChangeState(fi, ST_L2_4);
1487}
1488
1489static void
1490l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
1491{
1492 struct PStack *st = fi->userdata;
1493
1494 if (!test_and_set_bit(FLG_OWN_BUSY, &st->l2.flag)) {
1495 enquiry_cr(st, RNR, RSP, 0);
1496 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1497 }
1498}
1499
1500static void
1501l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
1502{
1503 struct PStack *st = fi->userdata;
1504
1505 if (!test_and_clear_bit(FLG_OWN_BUSY, &st->l2.flag)) {
1506 enquiry_cr(st, RR, RSP, 0);
1507 test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag);
1508 }
1509}
1510
1511static void
1512l2_frame_error(struct FsmInst *fi, int event, void *arg)
1513{
1514 struct PStack *st = fi->userdata;
1515
1516 st->ma.layer(st, MDL_ERROR | INDICATION, arg);
1517}
1518
1519static void
1520l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
1521{
1522 struct PStack *st = fi->userdata;
1523
1524 st->ma.layer(st, MDL_ERROR | INDICATION, arg);
1525 establishlink(fi);
1526 test_and_clear_bit(FLG_L3_INIT, &st->l2.flag);
1527}
1528
1529static struct FsmNode L2FnList[] __initdata =
1530{
1531 {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
1532 {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
1533 {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
1534 {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
1535 {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1536 {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1537 {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
1538 {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
1539 {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1540 {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1541 {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
1542 {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
1543 {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
1544 {ST_L2_1, EV_L2_DL_UNIT_DATA, l2_queue_ui_assign},
1545 {ST_L2_2, EV_L2_DL_UNIT_DATA, l2_queue_ui},
1546 {ST_L2_3, EV_L2_DL_UNIT_DATA, l2_queue_ui},
1547 {ST_L2_4, EV_L2_DL_UNIT_DATA, l2_send_ui},
1548 {ST_L2_5, EV_L2_DL_UNIT_DATA, l2_send_ui},
1549 {ST_L2_6, EV_L2_DL_UNIT_DATA, l2_send_ui},
1550 {ST_L2_7, EV_L2_DL_UNIT_DATA, l2_send_ui},
1551 {ST_L2_8, EV_L2_DL_UNIT_DATA, l2_send_ui},
1552 {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
1553 {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
1554 {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
1555 {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
1556 {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
1557 {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
1558 {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
1559 {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
1560 {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
1561 {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
1562 {ST_L2_4, EV_L2_SABME, l2_start_multi},
1563 {ST_L2_5, EV_L2_SABME, l2_send_UA},
1564 {ST_L2_6, EV_L2_SABME, l2_send_DM},
1565 {ST_L2_7, EV_L2_SABME, l2_restart_multi},
1566 {ST_L2_8, EV_L2_SABME, l2_restart_multi},
1567 {ST_L2_4, EV_L2_DISC, l2_send_DM},
1568 {ST_L2_5, EV_L2_DISC, l2_send_DM},
1569 {ST_L2_6, EV_L2_DISC, l2_send_UA},
1570 {ST_L2_7, EV_L2_DISC, l2_stop_multi},
1571 {ST_L2_8, EV_L2_DISC, l2_stop_multi},
1572 {ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
1573 {ST_L2_5, EV_L2_UA, l2_connected},
1574 {ST_L2_6, EV_L2_UA, l2_released},
1575 {ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
1576 {ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
1577 {ST_L2_4, EV_L2_DM, l2_reestablish},
1578 {ST_L2_5, EV_L2_DM, l2_st5_dm_release},
1579 {ST_L2_6, EV_L2_DM, l2_st6_dm_release},
1580 {ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
1581 {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
1582 {ST_L2_1, EV_L2_UI, l2_got_ui},
1583 {ST_L2_2, EV_L2_UI, l2_got_ui},
1584 {ST_L2_3, EV_L2_UI, l2_got_ui},
1585 {ST_L2_4, EV_L2_UI, l2_got_ui},
1586 {ST_L2_5, EV_L2_UI, l2_got_ui},
1587 {ST_L2_6, EV_L2_UI, l2_got_ui},
1588 {ST_L2_7, EV_L2_UI, l2_got_ui},
1589 {ST_L2_8, EV_L2_UI, l2_got_ui},
1590 {ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
1591 {ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
1592 {ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
1593 {ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
1594 {ST_L2_7, EV_L2_I, l2_got_iframe},
1595 {ST_L2_8, EV_L2_I, l2_got_iframe},
1596 {ST_L2_5, EV_L2_T200, l2_st5_tout_200},
1597 {ST_L2_6, EV_L2_T200, l2_st6_tout_200},
1598 {ST_L2_7, EV_L2_T200, l2_st7_tout_200},
1599 {ST_L2_8, EV_L2_T200, l2_st8_tout_200},
1600 {ST_L2_7, EV_L2_T203, l2_st7_tout_203},
1601 {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
1602 {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1603 {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1604 {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1605 {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1606 {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
1607 {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
1608 {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
1609 {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1610 {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1611 {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1612 {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
1613 {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
1614 {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1615 {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da},
1616 {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da},
1617 {ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da},
1618 {ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da},
1619};
1620
1621static void
1622isdnl2_l1l2(struct PStack *st, int pr, void *arg)
1623{
1624 struct sk_buff *skb = arg;
1625 u_char *datap;
1626 int ret = 1, len;
1627 int c = 0;
1628
1629 switch (pr) {
1630 case (PH_DATA | INDICATION):
1631 datap = skb->data;
1632 len = l2addrsize(&st->l2);
1633 if (skb->len > len)
1634 datap += len;
1635 else {
1636 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'N');
1637 dev_kfree_skb(skb);
1638 return;
1639 }
1640 if (!(*datap & 1)) {
1641 if (!(c = iframe_error(st, skb)))
1642 ret = FsmEvent(&st->l2.l2m, EV_L2_I, skb);
1643 } else if (IsSFrame(datap, st)) {
1644 if (!(c = super_error(st, skb)))
1645 ret = FsmEvent(&st->l2.l2m, EV_L2_SUPER, skb);
1646 } else if (IsUI(datap)) {
1647 if (!(c = UI_error(st, skb)))
1648 ret = FsmEvent(&st->l2.l2m, EV_L2_UI, skb);
1649 } else if (IsSABME(datap, st)) {
1650 if (!(c = unnum_error(st, skb, CMD)))
1651 ret = FsmEvent(&st->l2.l2m, EV_L2_SABME, skb);
1652 } else if (IsUA(datap)) {
1653 if (!(c = unnum_error(st, skb, RSP)))
1654 ret = FsmEvent(&st->l2.l2m, EV_L2_UA, skb);
1655 } else if (IsDISC(datap)) {
1656 if (!(c = unnum_error(st, skb, CMD)))
1657 ret = FsmEvent(&st->l2.l2m, EV_L2_DISC, skb);
1658 } else if (IsDM(datap)) {
1659 if (!(c = unnum_error(st, skb, RSP)))
1660 ret = FsmEvent(&st->l2.l2m, EV_L2_DM, skb);
1661 } else if (IsFRMR(datap)) {
1662 if (!(c = FRMR_error(st, skb)))
1663 ret = FsmEvent(&st->l2.l2m, EV_L2_FRMR, skb);
1664 } else {
1665 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *) 'L');
1666 dev_kfree_skb(skb);
1667 ret = 0;
1668 }
1669 if (c) {
1670 dev_kfree_skb(skb);
1671 FsmEvent(&st->l2.l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
1672 ret = 0;
1673 }
1674 if (ret)
1675 dev_kfree_skb(skb);
1676 break;
1677 case (PH_PULL | CONFIRM):
1678 FsmEvent(&st->l2.l2m, EV_L2_ACK_PULL, arg);
1679 break;
1680 case (PH_PAUSE | INDICATION):
1681 test_and_set_bit(FLG_DCHAN_BUSY, &st->l2.flag);
1682 break;
1683 case (PH_PAUSE | CONFIRM):
1684 test_and_clear_bit(FLG_DCHAN_BUSY, &st->l2.flag);
1685 break;
1686 case (PH_ACTIVATE | CONFIRM):
1687 case (PH_ACTIVATE | INDICATION):
1688 test_and_set_bit(FLG_L1_ACTIV, &st->l2.flag);
1689 if (test_and_clear_bit(FLG_ESTAB_PEND, &st->l2.flag))
1690 FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
1691 break;
1692 case (PH_DEACTIVATE | INDICATION):
1693 case (PH_DEACTIVATE | CONFIRM):
1694 test_and_clear_bit(FLG_L1_ACTIV, &st->l2.flag);
1695 FsmEvent(&st->l2.l2m, EV_L1_DEACTIVATE, arg);
1696 break;
1697 default:
1698 l2m_debug(&st->l2.l2m, "l2 unknown pr %04x", pr);
1699 break;
1700 }
1701}
1702
1703static void
1704isdnl2_l3l2(struct PStack *st, int pr, void *arg)
1705{
1706 switch (pr) {
1707 case (DL_DATA | REQUEST):
1708 if (FsmEvent(&st->l2.l2m, EV_L2_DL_DATA, arg)) {
1709 dev_kfree_skb((struct sk_buff *) arg);
1710 }
1711 break;
1712 case (DL_UNIT_DATA | REQUEST):
1713 if (FsmEvent(&st->l2.l2m, EV_L2_DL_UNIT_DATA, arg)) {
1714 dev_kfree_skb((struct sk_buff *) arg);
1715 }
1716 break;
1717 case (DL_ESTABLISH | REQUEST):
1718 if (test_bit(FLG_L1_ACTIV, &st->l2.flag)) {
1719 if (test_bit(FLG_LAPD, &st->l2.flag) ||
1720 test_bit(FLG_ORIG, &st->l2.flag)) {
1721 FsmEvent(&st->l2.l2m, EV_L2_DL_ESTABLISH_REQ, arg);
1722 }
1723 } else {
1724 if (test_bit(FLG_LAPD, &st->l2.flag) ||
1725 test_bit(FLG_ORIG, &st->l2.flag)) {
1726 test_and_set_bit(FLG_ESTAB_PEND, &st->l2.flag);
1727 }
1728 st->l2.l2l1(st, PH_ACTIVATE, NULL);
1729 }
1730 break;
1731 case (DL_RELEASE | REQUEST):
1732 if (test_bit(FLG_LAPB, &st->l2.flag)) {
1733 st->l2.l2l1(st, PH_DEACTIVATE, NULL);
1734 }
1735 FsmEvent(&st->l2.l2m, EV_L2_DL_RELEASE_REQ, arg);
1736 break;
1737 case (MDL_ASSIGN | REQUEST):
1738 FsmEvent(&st->l2.l2m, EV_L2_MDL_ASSIGN, arg);
1739 break;
1740 case (MDL_REMOVE | REQUEST):
1741 FsmEvent(&st->l2.l2m, EV_L2_MDL_REMOVE, arg);
1742 break;
1743 case (MDL_ERROR | RESPONSE):
1744 FsmEvent(&st->l2.l2m, EV_L2_MDL_ERROR, arg);
1745 break;
1746 }
1747}
1748
1749void
1750releasestack_isdnl2(struct PStack *st)
1751{
1752 FsmDelTimer(&st->l2.t200, 21);
1753 FsmDelTimer(&st->l2.t203, 16);
1754 skb_queue_purge(&st->l2.i_queue);
1755 skb_queue_purge(&st->l2.ui_queue);
1756 ReleaseWin(&st->l2);
1757}
1758
1759static void
1760l2m_debug(struct FsmInst *fi, char *fmt, ...)
1761{
1762 va_list args;
1763 struct PStack *st = fi->userdata;
1764
1765 va_start(args, fmt);
1766 VHiSax_putstatus(st->l1.hardware, st->l2.debug_id, fmt, args);
1767 va_end(args);
1768}
1769
1770void
1771setstack_isdnl2(struct PStack *st, char *debug_id)
1772{
1773 spin_lock_init(&st->l2.lock);
1774 st->l1.l1l2 = isdnl2_l1l2;
1775 st->l3.l3l2 = isdnl2_l3l2;
1776
1777 skb_queue_head_init(&st->l2.i_queue);
1778 skb_queue_head_init(&st->l2.ui_queue);
1779 InitWin(&st->l2);
1780 st->l2.debug = 0;
1781
1782 st->l2.l2m.fsm = &l2fsm;
1783 if (test_bit(FLG_LAPB, &st->l2.flag))
1784 st->l2.l2m.state = ST_L2_4;
1785 else
1786 st->l2.l2m.state = ST_L2_1;
1787 st->l2.l2m.debug = 0;
1788 st->l2.l2m.userdata = st;
1789 st->l2.l2m.userint = 0;
1790 st->l2.l2m.printdebug = l2m_debug;
1791 strcpy(st->l2.debug_id, debug_id);
1792
1793 FsmInitTimer(&st->l2.l2m, &st->l2.t200);
1794 FsmInitTimer(&st->l2.l2m, &st->l2.t203);
1795}
1796
1797static void
1798transl2_l3l2(struct PStack *st, int pr, void *arg)
1799{
1800 switch (pr) {
1801 case (DL_DATA | REQUEST):
1802 case (DL_UNIT_DATA | REQUEST):
1803 st->l2.l2l1(st, PH_DATA | REQUEST, arg);
1804 break;
1805 case (DL_ESTABLISH | REQUEST):
1806 st->l2.l2l1(st, PH_ACTIVATE | REQUEST, NULL);
1807 break;
1808 case (DL_RELEASE | REQUEST):
1809 st->l2.l2l1(st, PH_DEACTIVATE | REQUEST, NULL);
1810 break;
1811 }
1812}
1813
1814void
1815setstack_transl2(struct PStack *st)
1816{
1817 st->l3.l3l2 = transl2_l3l2;
1818}
1819
1820void
1821releasestack_transl2(struct PStack *st)
1822{
1823}
1824
1825int __init
1826Isdnl2New(void)
1827{
1828 l2fsm.state_count = L2_STATE_COUNT;
1829 l2fsm.event_count = L2_EVENT_COUNT;
1830 l2fsm.strEvent = strL2Event;
1831 l2fsm.strState = strL2State;
1832 return FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList));
1833}
1834
1835void
1836Isdnl2Free(void)
1837{
1838 FsmFree(&l2fsm);
1839}
1840
