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Merge tag 'powerpc-4.13-8' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[mirror_ubuntu-artful-kernel.git] / drivers / isdn / mISDN / layer2.c
1 /*
2 *
3 * Author Karsten Keil <kkeil@novell.com>
4 *
5 * Copyright 2008 by Karsten Keil <kkeil@novell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #include <linux/mISDNif.h>
19 #include <linux/slab.h>
20 #include "core.h"
21 #include "fsm.h"
22 #include "layer2.h"
23
24 static u_int *debug;
25
26 static
27 struct Fsm l2fsm = {NULL, 0, 0, NULL, NULL};
28
29 static char *strL2State[] =
30 {
31 "ST_L2_1",
32 "ST_L2_2",
33 "ST_L2_3",
34 "ST_L2_4",
35 "ST_L2_5",
36 "ST_L2_6",
37 "ST_L2_7",
38 "ST_L2_8",
39 };
40
41 enum {
42 EV_L2_UI,
43 EV_L2_SABME,
44 EV_L2_DISC,
45 EV_L2_DM,
46 EV_L2_UA,
47 EV_L2_FRMR,
48 EV_L2_SUPER,
49 EV_L2_I,
50 EV_L2_DL_DATA,
51 EV_L2_ACK_PULL,
52 EV_L2_DL_UNITDATA,
53 EV_L2_DL_ESTABLISH_REQ,
54 EV_L2_DL_RELEASE_REQ,
55 EV_L2_MDL_ASSIGN,
56 EV_L2_MDL_REMOVE,
57 EV_L2_MDL_ERROR,
58 EV_L1_DEACTIVATE,
59 EV_L2_T200,
60 EV_L2_T203,
61 EV_L2_T200I,
62 EV_L2_T203I,
63 EV_L2_SET_OWN_BUSY,
64 EV_L2_CLEAR_OWN_BUSY,
65 EV_L2_FRAME_ERROR,
66 };
67
68 #define L2_EVENT_COUNT (EV_L2_FRAME_ERROR + 1)
69
70 static char *strL2Event[] =
71 {
72 "EV_L2_UI",
73 "EV_L2_SABME",
74 "EV_L2_DISC",
75 "EV_L2_DM",
76 "EV_L2_UA",
77 "EV_L2_FRMR",
78 "EV_L2_SUPER",
79 "EV_L2_I",
80 "EV_L2_DL_DATA",
81 "EV_L2_ACK_PULL",
82 "EV_L2_DL_UNITDATA",
83 "EV_L2_DL_ESTABLISH_REQ",
84 "EV_L2_DL_RELEASE_REQ",
85 "EV_L2_MDL_ASSIGN",
86 "EV_L2_MDL_REMOVE",
87 "EV_L2_MDL_ERROR",
88 "EV_L1_DEACTIVATE",
89 "EV_L2_T200",
90 "EV_L2_T203",
91 "EV_L2_T200I",
92 "EV_L2_T203I",
93 "EV_L2_SET_OWN_BUSY",
94 "EV_L2_CLEAR_OWN_BUSY",
95 "EV_L2_FRAME_ERROR",
96 };
97
98 static void
99 l2m_debug(struct FsmInst *fi, char *fmt, ...)
100 {
101 struct layer2 *l2 = fi->userdata;
102 struct va_format vaf;
103 va_list va;
104
105 if (!(*debug & DEBUG_L2_FSM))
106 return;
107
108 va_start(va, fmt);
109
110 vaf.fmt = fmt;
111 vaf.va = &va;
112
113 printk(KERN_DEBUG "%s l2 (sapi %d tei %d): %pV\n",
114 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, &vaf);
115
116 va_end(va);
117 }
118
119 inline u_int
120 l2headersize(struct layer2 *l2, int ui)
121 {
122 return ((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) +
123 (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1);
124 }
125
126 inline u_int
127 l2addrsize(struct layer2 *l2)
128 {
129 return test_bit(FLG_LAPD, &l2->flag) ? 2 : 1;
130 }
131
132 static u_int
133 l2_newid(struct layer2 *l2)
134 {
135 u_int id;
136
137 id = l2->next_id++;
138 if (id == 0x7fff)
139 l2->next_id = 1;
140 id <<= 16;
141 id |= l2->tei << 8;
142 id |= l2->sapi;
143 return id;
144 }
145
146 static void
147 l2up(struct layer2 *l2, u_int prim, struct sk_buff *skb)
148 {
149 int err;
150
151 if (!l2->up)
152 return;
153 mISDN_HEAD_PRIM(skb) = prim;
154 mISDN_HEAD_ID(skb) = (l2->ch.nr << 16) | l2->ch.addr;
155 err = l2->up->send(l2->up, skb);
156 if (err) {
157 printk(KERN_WARNING "%s: dev %s err=%d\n", __func__,
158 mISDNDevName4ch(&l2->ch), err);
159 dev_kfree_skb(skb);
160 }
161 }
162
163 static void
164 l2up_create(struct layer2 *l2, u_int prim, int len, void *arg)
165 {
166 struct sk_buff *skb;
167 struct mISDNhead *hh;
168 int err;
169
170 if (!l2->up)
171 return;
172 skb = mI_alloc_skb(len, GFP_ATOMIC);
173 if (!skb)
174 return;
175 hh = mISDN_HEAD_P(skb);
176 hh->prim = prim;
177 hh->id = (l2->ch.nr << 16) | l2->ch.addr;
178 if (len)
179 skb_put_data(skb, arg, len);
180 err = l2->up->send(l2->up, skb);
181 if (err) {
182 printk(KERN_WARNING "%s: dev %s err=%d\n", __func__,
183 mISDNDevName4ch(&l2->ch), err);
184 dev_kfree_skb(skb);
185 }
186 }
187
188 static int
189 l2down_skb(struct layer2 *l2, struct sk_buff *skb) {
190 int ret;
191
192 ret = l2->ch.recv(l2->ch.peer, skb);
193 if (ret && (*debug & DEBUG_L2_RECV))
194 printk(KERN_DEBUG "l2down_skb: dev %s ret(%d)\n",
195 mISDNDevName4ch(&l2->ch), ret);
196 return ret;
197 }
198
199 static int
200 l2down_raw(struct layer2 *l2, struct sk_buff *skb)
201 {
202 struct mISDNhead *hh = mISDN_HEAD_P(skb);
203
204 if (hh->prim == PH_DATA_REQ) {
205 if (test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
206 skb_queue_tail(&l2->down_queue, skb);
207 return 0;
208 }
209 l2->down_id = mISDN_HEAD_ID(skb);
210 }
211 return l2down_skb(l2, skb);
212 }
213
214 static int
215 l2down(struct layer2 *l2, u_int prim, u_int id, struct sk_buff *skb)
216 {
217 struct mISDNhead *hh = mISDN_HEAD_P(skb);
218
219 hh->prim = prim;
220 hh->id = id;
221 return l2down_raw(l2, skb);
222 }
223
224 static int
225 l2down_create(struct layer2 *l2, u_int prim, u_int id, int len, void *arg)
226 {
227 struct sk_buff *skb;
228 int err;
229 struct mISDNhead *hh;
230
231 skb = mI_alloc_skb(len, GFP_ATOMIC);
232 if (!skb)
233 return -ENOMEM;
234 hh = mISDN_HEAD_P(skb);
235 hh->prim = prim;
236 hh->id = id;
237 if (len)
238 skb_put_data(skb, arg, len);
239 err = l2down_raw(l2, skb);
240 if (err)
241 dev_kfree_skb(skb);
242 return err;
243 }
244
245 static int
246 ph_data_confirm(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) {
247 struct sk_buff *nskb = skb;
248 int ret = -EAGAIN;
249
250 if (test_bit(FLG_L1_NOTREADY, &l2->flag)) {
251 if (hh->id == l2->down_id) {
252 nskb = skb_dequeue(&l2->down_queue);
253 if (nskb) {
254 l2->down_id = mISDN_HEAD_ID(nskb);
255 if (l2down_skb(l2, nskb)) {
256 dev_kfree_skb(nskb);
257 l2->down_id = MISDN_ID_NONE;
258 }
259 } else
260 l2->down_id = MISDN_ID_NONE;
261 if (ret) {
262 dev_kfree_skb(skb);
263 ret = 0;
264 }
265 if (l2->down_id == MISDN_ID_NONE) {
266 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
267 mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL);
268 }
269 }
270 }
271 if (!test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) {
272 nskb = skb_dequeue(&l2->down_queue);
273 if (nskb) {
274 l2->down_id = mISDN_HEAD_ID(nskb);
275 if (l2down_skb(l2, nskb)) {
276 dev_kfree_skb(nskb);
277 l2->down_id = MISDN_ID_NONE;
278 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
279 }
280 } else
281 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag);
282 }
283 return ret;
284 }
285
286 static void
287 l2_timeout(struct FsmInst *fi, int event, void *arg)
288 {
289 struct layer2 *l2 = fi->userdata;
290 struct sk_buff *skb;
291 struct mISDNhead *hh;
292
293 skb = mI_alloc_skb(0, GFP_ATOMIC);
294 if (!skb) {
295 printk(KERN_WARNING "%s: L2(%d,%d) nr:%x timer %s no skb\n",
296 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei,
297 l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203");
298 return;
299 }
300 hh = mISDN_HEAD_P(skb);
301 hh->prim = event == EV_L2_T200 ? DL_TIMER200_IND : DL_TIMER203_IND;
302 hh->id = l2->ch.nr;
303 if (*debug & DEBUG_TIMER)
304 printk(KERN_DEBUG "%s: L2(%d,%d) nr:%x timer %s expired\n",
305 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei,
306 l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203");
307 if (l2->ch.st)
308 l2->ch.st->own.recv(&l2->ch.st->own, skb);
309 }
310
311 static int
312 l2mgr(struct layer2 *l2, u_int prim, void *arg) {
313 long c = (long)arg;
314
315 printk(KERN_WARNING "l2mgr: dev %s addr:%x prim %x %c\n",
316 mISDNDevName4ch(&l2->ch), l2->id, prim, (char)c);
317 if (test_bit(FLG_LAPD, &l2->flag) &&
318 !test_bit(FLG_FIXED_TEI, &l2->flag)) {
319 switch (c) {
320 case 'C':
321 case 'D':
322 case 'G':
323 case 'H':
324 l2_tei(l2, prim, (u_long)arg);
325 break;
326 }
327 }
328 return 0;
329 }
330
331 static void
332 set_peer_busy(struct layer2 *l2) {
333 test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
334 if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue))
335 test_and_set_bit(FLG_L2BLOCK, &l2->flag);
336 }
337
338 static void
339 clear_peer_busy(struct layer2 *l2) {
340 if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag))
341 test_and_clear_bit(FLG_L2BLOCK, &l2->flag);
342 }
343
344 static void
345 InitWin(struct layer2 *l2)
346 {
347 int i;
348
349 for (i = 0; i < MAX_WINDOW; i++)
350 l2->windowar[i] = NULL;
351 }
352
353 static int
354 freewin(struct layer2 *l2)
355 {
356 int i, cnt = 0;
357
358 for (i = 0; i < MAX_WINDOW; i++) {
359 if (l2->windowar[i]) {
360 cnt++;
361 dev_kfree_skb(l2->windowar[i]);
362 l2->windowar[i] = NULL;
363 }
364 }
365 return cnt;
366 }
367
368 static void
369 ReleaseWin(struct layer2 *l2)
370 {
371 int cnt = freewin(l2);
372
373 if (cnt)
374 printk(KERN_WARNING
375 "isdnl2 freed %d skbuffs in release\n", cnt);
376 }
377
378 inline unsigned int
379 cansend(struct layer2 *l2)
380 {
381 unsigned int p1;
382
383 if (test_bit(FLG_MOD128, &l2->flag))
384 p1 = (l2->vs - l2->va) % 128;
385 else
386 p1 = (l2->vs - l2->va) % 8;
387 return (p1 < l2->window) && !test_bit(FLG_PEER_BUSY, &l2->flag);
388 }
389
390 inline void
391 clear_exception(struct layer2 *l2)
392 {
393 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
394 test_and_clear_bit(FLG_REJEXC, &l2->flag);
395 test_and_clear_bit(FLG_OWN_BUSY, &l2->flag);
396 clear_peer_busy(l2);
397 }
398
399 static int
400 sethdraddr(struct layer2 *l2, u_char *header, int rsp)
401 {
402 u_char *ptr = header;
403 int crbit = rsp;
404
405 if (test_bit(FLG_LAPD, &l2->flag)) {
406 if (test_bit(FLG_LAPD_NET, &l2->flag))
407 crbit = !crbit;
408 *ptr++ = (l2->sapi << 2) | (crbit ? 2 : 0);
409 *ptr++ = (l2->tei << 1) | 1;
410 return 2;
411 } else {
412 if (test_bit(FLG_ORIG, &l2->flag))
413 crbit = !crbit;
414 if (crbit)
415 *ptr++ = l2->addr.B;
416 else
417 *ptr++ = l2->addr.A;
418 return 1;
419 }
420 }
421
422 static inline void
423 enqueue_super(struct layer2 *l2, struct sk_buff *skb)
424 {
425 if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
426 dev_kfree_skb(skb);
427 }
428
429 static inline void
430 enqueue_ui(struct layer2 *l2, struct sk_buff *skb)
431 {
432 if (l2->tm)
433 l2_tei(l2, MDL_STATUS_UI_IND, 0);
434 if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb))
435 dev_kfree_skb(skb);
436 }
437
438 inline int
439 IsUI(u_char *data)
440 {
441 return (data[0] & 0xef) == UI;
442 }
443
444 inline int
445 IsUA(u_char *data)
446 {
447 return (data[0] & 0xef) == UA;
448 }
449
450 inline int
451 IsDM(u_char *data)
452 {
453 return (data[0] & 0xef) == DM;
454 }
455
456 inline int
457 IsDISC(u_char *data)
458 {
459 return (data[0] & 0xef) == DISC;
460 }
461
462 inline int
463 IsRR(u_char *data, struct layer2 *l2)
464 {
465 if (test_bit(FLG_MOD128, &l2->flag))
466 return data[0] == RR;
467 else
468 return (data[0] & 0xf) == 1;
469 }
470
471 inline int
472 IsSFrame(u_char *data, struct layer2 *l2)
473 {
474 register u_char d = *data;
475
476 if (!test_bit(FLG_MOD128, &l2->flag))
477 d &= 0xf;
478 return ((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c);
479 }
480
481 inline int
482 IsSABME(u_char *data, struct layer2 *l2)
483 {
484 u_char d = data[0] & ~0x10;
485
486 return test_bit(FLG_MOD128, &l2->flag) ? d == SABME : d == SABM;
487 }
488
489 inline int
490 IsREJ(u_char *data, struct layer2 *l2)
491 {
492 return test_bit(FLG_MOD128, &l2->flag) ?
493 data[0] == REJ : (data[0] & 0xf) == REJ;
494 }
495
496 inline int
497 IsFRMR(u_char *data)
498 {
499 return (data[0] & 0xef) == FRMR;
500 }
501
502 inline int
503 IsRNR(u_char *data, struct layer2 *l2)
504 {
505 return test_bit(FLG_MOD128, &l2->flag) ?
506 data[0] == RNR : (data[0] & 0xf) == RNR;
507 }
508
509 static int
510 iframe_error(struct layer2 *l2, struct sk_buff *skb)
511 {
512 u_int i;
513 int rsp = *skb->data & 0x2;
514
515 i = l2addrsize(l2) + (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1);
516 if (test_bit(FLG_ORIG, &l2->flag))
517 rsp = !rsp;
518 if (rsp)
519 return 'L';
520 if (skb->len < i)
521 return 'N';
522 if ((skb->len - i) > l2->maxlen)
523 return 'O';
524 return 0;
525 }
526
527 static int
528 super_error(struct layer2 *l2, struct sk_buff *skb)
529 {
530 if (skb->len != l2addrsize(l2) +
531 (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1))
532 return 'N';
533 return 0;
534 }
535
536 static int
537 unnum_error(struct layer2 *l2, struct sk_buff *skb, int wantrsp)
538 {
539 int rsp = (*skb->data & 0x2) >> 1;
540 if (test_bit(FLG_ORIG, &l2->flag))
541 rsp = !rsp;
542 if (rsp != wantrsp)
543 return 'L';
544 if (skb->len != l2addrsize(l2) + 1)
545 return 'N';
546 return 0;
547 }
548
549 static int
550 UI_error(struct layer2 *l2, struct sk_buff *skb)
551 {
552 int rsp = *skb->data & 0x2;
553 if (test_bit(FLG_ORIG, &l2->flag))
554 rsp = !rsp;
555 if (rsp)
556 return 'L';
557 if (skb->len > l2->maxlen + l2addrsize(l2) + 1)
558 return 'O';
559 return 0;
560 }
561
562 static int
563 FRMR_error(struct layer2 *l2, struct sk_buff *skb)
564 {
565 u_int headers = l2addrsize(l2) + 1;
566 u_char *datap = skb->data + headers;
567 int rsp = *skb->data & 0x2;
568
569 if (test_bit(FLG_ORIG, &l2->flag))
570 rsp = !rsp;
571 if (!rsp)
572 return 'L';
573 if (test_bit(FLG_MOD128, &l2->flag)) {
574 if (skb->len < headers + 5)
575 return 'N';
576 else if (*debug & DEBUG_L2)
577 l2m_debug(&l2->l2m,
578 "FRMR information %2x %2x %2x %2x %2x",
579 datap[0], datap[1], datap[2], datap[3], datap[4]);
580 } else {
581 if (skb->len < headers + 3)
582 return 'N';
583 else if (*debug & DEBUG_L2)
584 l2m_debug(&l2->l2m,
585 "FRMR information %2x %2x %2x",
586 datap[0], datap[1], datap[2]);
587 }
588 return 0;
589 }
590
591 static unsigned int
592 legalnr(struct layer2 *l2, unsigned int nr)
593 {
594 if (test_bit(FLG_MOD128, &l2->flag))
595 return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128);
596 else
597 return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8);
598 }
599
600 static void
601 setva(struct layer2 *l2, unsigned int nr)
602 {
603 struct sk_buff *skb;
604
605 while (l2->va != nr) {
606 l2->va++;
607 if (test_bit(FLG_MOD128, &l2->flag))
608 l2->va %= 128;
609 else
610 l2->va %= 8;
611 if (l2->windowar[l2->sow]) {
612 skb_trim(l2->windowar[l2->sow], 0);
613 skb_queue_tail(&l2->tmp_queue, l2->windowar[l2->sow]);
614 l2->windowar[l2->sow] = NULL;
615 }
616 l2->sow = (l2->sow + 1) % l2->window;
617 }
618 skb = skb_dequeue(&l2->tmp_queue);
619 while (skb) {
620 dev_kfree_skb(skb);
621 skb = skb_dequeue(&l2->tmp_queue);
622 }
623 }
624
625 static void
626 send_uframe(struct layer2 *l2, struct sk_buff *skb, u_char cmd, u_char cr)
627 {
628 u_char tmp[MAX_L2HEADER_LEN];
629 int i;
630
631 i = sethdraddr(l2, tmp, cr);
632 tmp[i++] = cmd;
633 if (skb)
634 skb_trim(skb, 0);
635 else {
636 skb = mI_alloc_skb(i, GFP_ATOMIC);
637 if (!skb) {
638 printk(KERN_WARNING "%s: can't alloc skbuff in %s\n",
639 mISDNDevName4ch(&l2->ch), __func__);
640 return;
641 }
642 }
643 skb_put_data(skb, tmp, i);
644 enqueue_super(l2, skb);
645 }
646
647
648 inline u_char
649 get_PollFlag(struct layer2 *l2, struct sk_buff *skb)
650 {
651 return skb->data[l2addrsize(l2)] & 0x10;
652 }
653
654 inline u_char
655 get_PollFlagFree(struct layer2 *l2, struct sk_buff *skb)
656 {
657 u_char PF;
658
659 PF = get_PollFlag(l2, skb);
660 dev_kfree_skb(skb);
661 return PF;
662 }
663
664 inline void
665 start_t200(struct layer2 *l2, int i)
666 {
667 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i);
668 test_and_set_bit(FLG_T200_RUN, &l2->flag);
669 }
670
671 inline void
672 restart_t200(struct layer2 *l2, int i)
673 {
674 mISDN_FsmRestartTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i);
675 test_and_set_bit(FLG_T200_RUN, &l2->flag);
676 }
677
678 inline void
679 stop_t200(struct layer2 *l2, int i)
680 {
681 if (test_and_clear_bit(FLG_T200_RUN, &l2->flag))
682 mISDN_FsmDelTimer(&l2->t200, i);
683 }
684
685 inline void
686 st5_dl_release_l2l3(struct layer2 *l2)
687 {
688 int pr;
689
690 if (test_and_clear_bit(FLG_PEND_REL, &l2->flag))
691 pr = DL_RELEASE_CNF;
692 else
693 pr = DL_RELEASE_IND;
694 l2up_create(l2, pr, 0, NULL);
695 }
696
697 inline void
698 lapb_dl_release_l2l3(struct layer2 *l2, int f)
699 {
700 if (test_bit(FLG_LAPB, &l2->flag))
701 l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL);
702 l2up_create(l2, f, 0, NULL);
703 }
704
705 static void
706 establishlink(struct FsmInst *fi)
707 {
708 struct layer2 *l2 = fi->userdata;
709 u_char cmd;
710
711 clear_exception(l2);
712 l2->rc = 0;
713 cmd = (test_bit(FLG_MOD128, &l2->flag) ? SABME : SABM) | 0x10;
714 send_uframe(l2, NULL, cmd, CMD);
715 mISDN_FsmDelTimer(&l2->t203, 1);
716 restart_t200(l2, 1);
717 test_and_clear_bit(FLG_PEND_REL, &l2->flag);
718 freewin(l2);
719 mISDN_FsmChangeState(fi, ST_L2_5);
720 }
721
722 static void
723 l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg)
724 {
725 struct sk_buff *skb = arg;
726 struct layer2 *l2 = fi->userdata;
727
728 if (get_PollFlagFree(l2, skb))
729 l2mgr(l2, MDL_ERROR_IND, (void *) 'C');
730 else
731 l2mgr(l2, MDL_ERROR_IND, (void *) 'D');
732
733 }
734
735 static void
736 l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
737 {
738 struct sk_buff *skb = arg;
739 struct layer2 *l2 = fi->userdata;
740
741 if (get_PollFlagFree(l2, skb))
742 l2mgr(l2, MDL_ERROR_IND, (void *) 'B');
743 else {
744 l2mgr(l2, MDL_ERROR_IND, (void *) 'E');
745 establishlink(fi);
746 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
747 }
748 }
749
750 static void
751 l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg)
752 {
753 struct sk_buff *skb = arg;
754 struct layer2 *l2 = fi->userdata;
755
756 if (get_PollFlagFree(l2, skb))
757 l2mgr(l2, MDL_ERROR_IND, (void *) 'B');
758 else
759 l2mgr(l2, MDL_ERROR_IND, (void *) 'E');
760 establishlink(fi);
761 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
762 }
763
764 static void
765 l2_go_st3(struct FsmInst *fi, int event, void *arg)
766 {
767 dev_kfree_skb((struct sk_buff *)arg);
768 mISDN_FsmChangeState(fi, ST_L2_3);
769 }
770
771 static void
772 l2_mdl_assign(struct FsmInst *fi, int event, void *arg)
773 {
774 struct layer2 *l2 = fi->userdata;
775
776 mISDN_FsmChangeState(fi, ST_L2_3);
777 dev_kfree_skb((struct sk_buff *)arg);
778 l2_tei(l2, MDL_ASSIGN_IND, 0);
779 }
780
781 static void
782 l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg)
783 {
784 struct layer2 *l2 = fi->userdata;
785 struct sk_buff *skb = arg;
786
787 skb_queue_tail(&l2->ui_queue, skb);
788 mISDN_FsmChangeState(fi, ST_L2_2);
789 l2_tei(l2, MDL_ASSIGN_IND, 0);
790 }
791
792 static void
793 l2_queue_ui(struct FsmInst *fi, int event, void *arg)
794 {
795 struct layer2 *l2 = fi->userdata;
796 struct sk_buff *skb = arg;
797
798 skb_queue_tail(&l2->ui_queue, skb);
799 }
800
801 static void
802 tx_ui(struct layer2 *l2)
803 {
804 struct sk_buff *skb;
805 u_char header[MAX_L2HEADER_LEN];
806 int i;
807
808 i = sethdraddr(l2, header, CMD);
809 if (test_bit(FLG_LAPD_NET, &l2->flag))
810 header[1] = 0xff; /* tei 127 */
811 header[i++] = UI;
812 while ((skb = skb_dequeue(&l2->ui_queue))) {
813 memcpy(skb_push(skb, i), header, i);
814 enqueue_ui(l2, skb);
815 }
816 }
817
818 static void
819 l2_send_ui(struct FsmInst *fi, int event, void *arg)
820 {
821 struct layer2 *l2 = fi->userdata;
822 struct sk_buff *skb = arg;
823
824 skb_queue_tail(&l2->ui_queue, skb);
825 tx_ui(l2);
826 }
827
828 static void
829 l2_got_ui(struct FsmInst *fi, int event, void *arg)
830 {
831 struct layer2 *l2 = fi->userdata;
832 struct sk_buff *skb = arg;
833
834 skb_pull(skb, l2headersize(l2, 1));
835 /*
836 * in states 1-3 for broadcast
837 */
838
839 if (l2->tm)
840 l2_tei(l2, MDL_STATUS_UI_IND, 0);
841 l2up(l2, DL_UNITDATA_IND, skb);
842 }
843
844 static void
845 l2_establish(struct FsmInst *fi, int event, void *arg)
846 {
847 struct sk_buff *skb = arg;
848 struct layer2 *l2 = fi->userdata;
849
850 establishlink(fi);
851 test_and_set_bit(FLG_L3_INIT, &l2->flag);
852 dev_kfree_skb(skb);
853 }
854
855 static void
856 l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg)
857 {
858 struct sk_buff *skb = arg;
859 struct layer2 *l2 = fi->userdata;
860
861 skb_queue_purge(&l2->i_queue);
862 test_and_set_bit(FLG_L3_INIT, &l2->flag);
863 test_and_clear_bit(FLG_PEND_REL, &l2->flag);
864 dev_kfree_skb(skb);
865 }
866
867 static void
868 l2_l3_reestablish(struct FsmInst *fi, int event, void *arg)
869 {
870 struct sk_buff *skb = arg;
871 struct layer2 *l2 = fi->userdata;
872
873 skb_queue_purge(&l2->i_queue);
874 establishlink(fi);
875 test_and_set_bit(FLG_L3_INIT, &l2->flag);
876 dev_kfree_skb(skb);
877 }
878
879 static void
880 l2_release(struct FsmInst *fi, int event, void *arg)
881 {
882 struct layer2 *l2 = fi->userdata;
883 struct sk_buff *skb = arg;
884
885 skb_trim(skb, 0);
886 l2up(l2, DL_RELEASE_CNF, skb);
887 }
888
889 static void
890 l2_pend_rel(struct FsmInst *fi, int event, void *arg)
891 {
892 struct sk_buff *skb = arg;
893 struct layer2 *l2 = fi->userdata;
894
895 test_and_set_bit(FLG_PEND_REL, &l2->flag);
896 dev_kfree_skb(skb);
897 }
898
899 static void
900 l2_disconnect(struct FsmInst *fi, int event, void *arg)
901 {
902 struct layer2 *l2 = fi->userdata;
903 struct sk_buff *skb = arg;
904
905 skb_queue_purge(&l2->i_queue);
906 freewin(l2);
907 mISDN_FsmChangeState(fi, ST_L2_6);
908 l2->rc = 0;
909 send_uframe(l2, NULL, DISC | 0x10, CMD);
910 mISDN_FsmDelTimer(&l2->t203, 1);
911 restart_t200(l2, 2);
912 if (skb)
913 dev_kfree_skb(skb);
914 }
915
916 static void
917 l2_start_multi(struct FsmInst *fi, int event, void *arg)
918 {
919 struct layer2 *l2 = fi->userdata;
920 struct sk_buff *skb = arg;
921
922 l2->vs = 0;
923 l2->va = 0;
924 l2->vr = 0;
925 l2->sow = 0;
926 clear_exception(l2);
927 send_uframe(l2, NULL, UA | get_PollFlag(l2, skb), RSP);
928 mISDN_FsmChangeState(fi, ST_L2_7);
929 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3);
930 skb_trim(skb, 0);
931 l2up(l2, DL_ESTABLISH_IND, skb);
932 if (l2->tm)
933 l2_tei(l2, MDL_STATUS_UP_IND, 0);
934 }
935
936 static void
937 l2_send_UA(struct FsmInst *fi, int event, void *arg)
938 {
939 struct layer2 *l2 = fi->userdata;
940 struct sk_buff *skb = arg;
941
942 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
943 }
944
945 static void
946 l2_send_DM(struct FsmInst *fi, int event, void *arg)
947 {
948 struct layer2 *l2 = fi->userdata;
949 struct sk_buff *skb = arg;
950
951 send_uframe(l2, skb, DM | get_PollFlag(l2, skb), RSP);
952 }
953
954 static void
955 l2_restart_multi(struct FsmInst *fi, int event, void *arg)
956 {
957 struct layer2 *l2 = fi->userdata;
958 struct sk_buff *skb = arg;
959 int est = 0;
960
961 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
962
963 l2mgr(l2, MDL_ERROR_IND, (void *) 'F');
964
965 if (l2->vs != l2->va) {
966 skb_queue_purge(&l2->i_queue);
967 est = 1;
968 }
969
970 clear_exception(l2);
971 l2->vs = 0;
972 l2->va = 0;
973 l2->vr = 0;
974 l2->sow = 0;
975 mISDN_FsmChangeState(fi, ST_L2_7);
976 stop_t200(l2, 3);
977 mISDN_FsmRestartTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3);
978
979 if (est)
980 l2up_create(l2, DL_ESTABLISH_IND, 0, NULL);
981 /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST,
982 * MGR_SHORTSTATUS | INDICATION, SSTATUS_L2_ESTABLISHED,
983 * 0, NULL, 0);
984 */
985 if (skb_queue_len(&l2->i_queue) && cansend(l2))
986 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
987 }
988
989 static void
990 l2_stop_multi(struct FsmInst *fi, int event, void *arg)
991 {
992 struct layer2 *l2 = fi->userdata;
993 struct sk_buff *skb = arg;
994
995 mISDN_FsmChangeState(fi, ST_L2_4);
996 mISDN_FsmDelTimer(&l2->t203, 3);
997 stop_t200(l2, 4);
998
999 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP);
1000 skb_queue_purge(&l2->i_queue);
1001 freewin(l2);
1002 lapb_dl_release_l2l3(l2, DL_RELEASE_IND);
1003 if (l2->tm)
1004 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1005 }
1006
1007 static void
1008 l2_connected(struct FsmInst *fi, int event, void *arg)
1009 {
1010 struct layer2 *l2 = fi->userdata;
1011 struct sk_buff *skb = arg;
1012 int pr = -1;
1013
1014 if (!get_PollFlag(l2, skb)) {
1015 l2_mdl_error_ua(fi, event, arg);
1016 return;
1017 }
1018 dev_kfree_skb(skb);
1019 if (test_and_clear_bit(FLG_PEND_REL, &l2->flag))
1020 l2_disconnect(fi, event, NULL);
1021 if (test_and_clear_bit(FLG_L3_INIT, &l2->flag)) {
1022 pr = DL_ESTABLISH_CNF;
1023 } else if (l2->vs != l2->va) {
1024 skb_queue_purge(&l2->i_queue);
1025 pr = DL_ESTABLISH_IND;
1026 }
1027 stop_t200(l2, 5);
1028 l2->vr = 0;
1029 l2->vs = 0;
1030 l2->va = 0;
1031 l2->sow = 0;
1032 mISDN_FsmChangeState(fi, ST_L2_7);
1033 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 4);
1034 if (pr != -1)
1035 l2up_create(l2, pr, 0, NULL);
1036
1037 if (skb_queue_len(&l2->i_queue) && cansend(l2))
1038 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1039
1040 if (l2->tm)
1041 l2_tei(l2, MDL_STATUS_UP_IND, 0);
1042 }
1043
1044 static void
1045 l2_released(struct FsmInst *fi, int event, void *arg)
1046 {
1047 struct layer2 *l2 = fi->userdata;
1048 struct sk_buff *skb = arg;
1049
1050 if (!get_PollFlag(l2, skb)) {
1051 l2_mdl_error_ua(fi, event, arg);
1052 return;
1053 }
1054 dev_kfree_skb(skb);
1055 stop_t200(l2, 6);
1056 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
1057 mISDN_FsmChangeState(fi, ST_L2_4);
1058 if (l2->tm)
1059 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1060 }
1061
1062 static void
1063 l2_reestablish(struct FsmInst *fi, int event, void *arg)
1064 {
1065 struct layer2 *l2 = fi->userdata;
1066 struct sk_buff *skb = arg;
1067
1068 if (!get_PollFlagFree(l2, skb)) {
1069 establishlink(fi);
1070 test_and_set_bit(FLG_L3_INIT, &l2->flag);
1071 }
1072 }
1073
1074 static void
1075 l2_st5_dm_release(struct FsmInst *fi, int event, void *arg)
1076 {
1077 struct layer2 *l2 = fi->userdata;
1078 struct sk_buff *skb = arg;
1079
1080 if (get_PollFlagFree(l2, skb)) {
1081 stop_t200(l2, 7);
1082 if (!test_bit(FLG_L3_INIT, &l2->flag))
1083 skb_queue_purge(&l2->i_queue);
1084 if (test_bit(FLG_LAPB, &l2->flag))
1085 l2down_create(l2, PH_DEACTIVATE_REQ,
1086 l2_newid(l2), 0, NULL);
1087 st5_dl_release_l2l3(l2);
1088 mISDN_FsmChangeState(fi, ST_L2_4);
1089 if (l2->tm)
1090 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1091 }
1092 }
1093
1094 static void
1095 l2_st6_dm_release(struct FsmInst *fi, int event, void *arg)
1096 {
1097 struct layer2 *l2 = fi->userdata;
1098 struct sk_buff *skb = arg;
1099
1100 if (get_PollFlagFree(l2, skb)) {
1101 stop_t200(l2, 8);
1102 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
1103 mISDN_FsmChangeState(fi, ST_L2_4);
1104 if (l2->tm)
1105 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1106 }
1107 }
1108
1109 static void
1110 enquiry_cr(struct layer2 *l2, u_char typ, u_char cr, u_char pf)
1111 {
1112 struct sk_buff *skb;
1113 u_char tmp[MAX_L2HEADER_LEN];
1114 int i;
1115
1116 i = sethdraddr(l2, tmp, cr);
1117 if (test_bit(FLG_MOD128, &l2->flag)) {
1118 tmp[i++] = typ;
1119 tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0);
1120 } else
1121 tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0);
1122 skb = mI_alloc_skb(i, GFP_ATOMIC);
1123 if (!skb) {
1124 printk(KERN_WARNING "%s: isdnl2 can't alloc sbbuff in %s\n",
1125 mISDNDevName4ch(&l2->ch), __func__);
1126 return;
1127 }
1128 skb_put_data(skb, tmp, i);
1129 enqueue_super(l2, skb);
1130 }
1131
1132 inline void
1133 enquiry_response(struct layer2 *l2)
1134 {
1135 if (test_bit(FLG_OWN_BUSY, &l2->flag))
1136 enquiry_cr(l2, RNR, RSP, 1);
1137 else
1138 enquiry_cr(l2, RR, RSP, 1);
1139 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1140 }
1141
1142 inline void
1143 transmit_enquiry(struct layer2 *l2)
1144 {
1145 if (test_bit(FLG_OWN_BUSY, &l2->flag))
1146 enquiry_cr(l2, RNR, CMD, 1);
1147 else
1148 enquiry_cr(l2, RR, CMD, 1);
1149 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1150 start_t200(l2, 9);
1151 }
1152
1153
1154 static void
1155 nrerrorrecovery(struct FsmInst *fi)
1156 {
1157 struct layer2 *l2 = fi->userdata;
1158
1159 l2mgr(l2, MDL_ERROR_IND, (void *) 'J');
1160 establishlink(fi);
1161 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1162 }
1163
1164 static void
1165 invoke_retransmission(struct layer2 *l2, unsigned int nr)
1166 {
1167 u_int p1;
1168
1169 if (l2->vs != nr) {
1170 while (l2->vs != nr) {
1171 (l2->vs)--;
1172 if (test_bit(FLG_MOD128, &l2->flag)) {
1173 l2->vs %= 128;
1174 p1 = (l2->vs - l2->va) % 128;
1175 } else {
1176 l2->vs %= 8;
1177 p1 = (l2->vs - l2->va) % 8;
1178 }
1179 p1 = (p1 + l2->sow) % l2->window;
1180 if (l2->windowar[p1])
1181 skb_queue_head(&l2->i_queue, l2->windowar[p1]);
1182 else
1183 printk(KERN_WARNING
1184 "%s: windowar[%d] is NULL\n",
1185 mISDNDevName4ch(&l2->ch), p1);
1186 l2->windowar[p1] = NULL;
1187 }
1188 mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL);
1189 }
1190 }
1191
1192 static void
1193 l2_st7_got_super(struct FsmInst *fi, int event, void *arg)
1194 {
1195 struct layer2 *l2 = fi->userdata;
1196 struct sk_buff *skb = arg;
1197 int PollFlag, rsp, typ = RR;
1198 unsigned int nr;
1199
1200 rsp = *skb->data & 0x2;
1201 if (test_bit(FLG_ORIG, &l2->flag))
1202 rsp = !rsp;
1203
1204 skb_pull(skb, l2addrsize(l2));
1205 if (IsRNR(skb->data, l2)) {
1206 set_peer_busy(l2);
1207 typ = RNR;
1208 } else
1209 clear_peer_busy(l2);
1210 if (IsREJ(skb->data, l2))
1211 typ = REJ;
1212
1213 if (test_bit(FLG_MOD128, &l2->flag)) {
1214 PollFlag = (skb->data[1] & 0x1) == 0x1;
1215 nr = skb->data[1] >> 1;
1216 } else {
1217 PollFlag = (skb->data[0] & 0x10);
1218 nr = (skb->data[0] >> 5) & 0x7;
1219 }
1220 dev_kfree_skb(skb);
1221
1222 if (PollFlag) {
1223 if (rsp)
1224 l2mgr(l2, MDL_ERROR_IND, (void *) 'A');
1225 else
1226 enquiry_response(l2);
1227 }
1228 if (legalnr(l2, nr)) {
1229 if (typ == REJ) {
1230 setva(l2, nr);
1231 invoke_retransmission(l2, nr);
1232 stop_t200(l2, 10);
1233 if (mISDN_FsmAddTimer(&l2->t203, l2->T203,
1234 EV_L2_T203, NULL, 6))
1235 l2m_debug(&l2->l2m, "Restart T203 ST7 REJ");
1236 } else if ((nr == l2->vs) && (typ == RR)) {
1237 setva(l2, nr);
1238 stop_t200(l2, 11);
1239 mISDN_FsmRestartTimer(&l2->t203, l2->T203,
1240 EV_L2_T203, NULL, 7);
1241 } else if ((l2->va != nr) || (typ == RNR)) {
1242 setva(l2, nr);
1243 if (typ != RR)
1244 mISDN_FsmDelTimer(&l2->t203, 9);
1245 restart_t200(l2, 12);
1246 }
1247 if (skb_queue_len(&l2->i_queue) && (typ == RR))
1248 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1249 } else
1250 nrerrorrecovery(fi);
1251 }
1252
1253 static void
1254 l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg)
1255 {
1256 struct layer2 *l2 = fi->userdata;
1257 struct sk_buff *skb = arg;
1258
1259 if (!test_bit(FLG_L3_INIT, &l2->flag))
1260 skb_queue_tail(&l2->i_queue, skb);
1261 else
1262 dev_kfree_skb(skb);
1263 }
1264
1265 static void
1266 l2_feed_i_pull(struct FsmInst *fi, int event, void *arg)
1267 {
1268 struct layer2 *l2 = fi->userdata;
1269 struct sk_buff *skb = arg;
1270
1271 skb_queue_tail(&l2->i_queue, skb);
1272 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1273 }
1274
1275 static void
1276 l2_feed_iqueue(struct FsmInst *fi, int event, void *arg)
1277 {
1278 struct layer2 *l2 = fi->userdata;
1279 struct sk_buff *skb = arg;
1280
1281 skb_queue_tail(&l2->i_queue, skb);
1282 }
1283
1284 static void
1285 l2_got_iframe(struct FsmInst *fi, int event, void *arg)
1286 {
1287 struct layer2 *l2 = fi->userdata;
1288 struct sk_buff *skb = arg;
1289 int PollFlag, i;
1290 u_int ns, nr;
1291
1292 i = l2addrsize(l2);
1293 if (test_bit(FLG_MOD128, &l2->flag)) {
1294 PollFlag = ((skb->data[i + 1] & 0x1) == 0x1);
1295 ns = skb->data[i] >> 1;
1296 nr = (skb->data[i + 1] >> 1) & 0x7f;
1297 } else {
1298 PollFlag = (skb->data[i] & 0x10);
1299 ns = (skb->data[i] >> 1) & 0x7;
1300 nr = (skb->data[i] >> 5) & 0x7;
1301 }
1302 if (test_bit(FLG_OWN_BUSY, &l2->flag)) {
1303 dev_kfree_skb(skb);
1304 if (PollFlag)
1305 enquiry_response(l2);
1306 } else {
1307 if (l2->vr == ns) {
1308 l2->vr++;
1309 if (test_bit(FLG_MOD128, &l2->flag))
1310 l2->vr %= 128;
1311 else
1312 l2->vr %= 8;
1313 test_and_clear_bit(FLG_REJEXC, &l2->flag);
1314 if (PollFlag)
1315 enquiry_response(l2);
1316 else
1317 test_and_set_bit(FLG_ACK_PEND, &l2->flag);
1318 skb_pull(skb, l2headersize(l2, 0));
1319 l2up(l2, DL_DATA_IND, skb);
1320 } else {
1321 /* n(s)!=v(r) */
1322 dev_kfree_skb(skb);
1323 if (test_and_set_bit(FLG_REJEXC, &l2->flag)) {
1324 if (PollFlag)
1325 enquiry_response(l2);
1326 } else {
1327 enquiry_cr(l2, REJ, RSP, PollFlag);
1328 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1329 }
1330 }
1331 }
1332 if (legalnr(l2, nr)) {
1333 if (!test_bit(FLG_PEER_BUSY, &l2->flag) &&
1334 (fi->state == ST_L2_7)) {
1335 if (nr == l2->vs) {
1336 stop_t200(l2, 13);
1337 mISDN_FsmRestartTimer(&l2->t203, l2->T203,
1338 EV_L2_T203, NULL, 7);
1339 } else if (nr != l2->va)
1340 restart_t200(l2, 14);
1341 }
1342 setva(l2, nr);
1343 } else {
1344 nrerrorrecovery(fi);
1345 return;
1346 }
1347 if (skb_queue_len(&l2->i_queue) && (fi->state == ST_L2_7))
1348 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1349 if (test_and_clear_bit(FLG_ACK_PEND, &l2->flag))
1350 enquiry_cr(l2, RR, RSP, 0);
1351 }
1352
1353 static void
1354 l2_got_tei(struct FsmInst *fi, int event, void *arg)
1355 {
1356 struct layer2 *l2 = fi->userdata;
1357 u_int info;
1358
1359 l2->tei = (signed char)(long)arg;
1360 set_channel_address(&l2->ch, l2->sapi, l2->tei);
1361 info = DL_INFO_L2_CONNECT;
1362 l2up_create(l2, DL_INFORMATION_IND, sizeof(info), &info);
1363 if (fi->state == ST_L2_3) {
1364 establishlink(fi);
1365 test_and_set_bit(FLG_L3_INIT, &l2->flag);
1366 } else
1367 mISDN_FsmChangeState(fi, ST_L2_4);
1368 if (skb_queue_len(&l2->ui_queue))
1369 tx_ui(l2);
1370 }
1371
1372 static void
1373 l2_st5_tout_200(struct FsmInst *fi, int event, void *arg)
1374 {
1375 struct layer2 *l2 = fi->userdata;
1376
1377 if (test_bit(FLG_LAPD, &l2->flag) &&
1378 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1379 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1380 } else if (l2->rc == l2->N200) {
1381 mISDN_FsmChangeState(fi, ST_L2_4);
1382 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1383 skb_queue_purge(&l2->i_queue);
1384 l2mgr(l2, MDL_ERROR_IND, (void *) 'G');
1385 if (test_bit(FLG_LAPB, &l2->flag))
1386 l2down_create(l2, PH_DEACTIVATE_REQ,
1387 l2_newid(l2), 0, NULL);
1388 st5_dl_release_l2l3(l2);
1389 if (l2->tm)
1390 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1391 } else {
1392 l2->rc++;
1393 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1394 send_uframe(l2, NULL, (test_bit(FLG_MOD128, &l2->flag) ?
1395 SABME : SABM) | 0x10, CMD);
1396 }
1397 }
1398
1399 static void
1400 l2_st6_tout_200(struct FsmInst *fi, int event, void *arg)
1401 {
1402 struct layer2 *l2 = fi->userdata;
1403
1404 if (test_bit(FLG_LAPD, &l2->flag) &&
1405 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1406 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1407 } else if (l2->rc == l2->N200) {
1408 mISDN_FsmChangeState(fi, ST_L2_4);
1409 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1410 l2mgr(l2, MDL_ERROR_IND, (void *) 'H');
1411 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF);
1412 if (l2->tm)
1413 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1414 } else {
1415 l2->rc++;
1416 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200,
1417 NULL, 9);
1418 send_uframe(l2, NULL, DISC | 0x10, CMD);
1419 }
1420 }
1421
1422 static void
1423 l2_st7_tout_200(struct FsmInst *fi, int event, void *arg)
1424 {
1425 struct layer2 *l2 = fi->userdata;
1426
1427 if (test_bit(FLG_LAPD, &l2->flag) &&
1428 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1429 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1430 return;
1431 }
1432 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1433 l2->rc = 0;
1434 mISDN_FsmChangeState(fi, ST_L2_8);
1435 transmit_enquiry(l2);
1436 l2->rc++;
1437 }
1438
1439 static void
1440 l2_st8_tout_200(struct FsmInst *fi, int event, void *arg)
1441 {
1442 struct layer2 *l2 = fi->userdata;
1443
1444 if (test_bit(FLG_LAPD, &l2->flag) &&
1445 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1446 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9);
1447 return;
1448 }
1449 test_and_clear_bit(FLG_T200_RUN, &l2->flag);
1450 if (l2->rc == l2->N200) {
1451 l2mgr(l2, MDL_ERROR_IND, (void *) 'I');
1452 establishlink(fi);
1453 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1454 } else {
1455 transmit_enquiry(l2);
1456 l2->rc++;
1457 }
1458 }
1459
1460 static void
1461 l2_st7_tout_203(struct FsmInst *fi, int event, void *arg)
1462 {
1463 struct layer2 *l2 = fi->userdata;
1464
1465 if (test_bit(FLG_LAPD, &l2->flag) &&
1466 test_bit(FLG_DCHAN_BUSY, &l2->flag)) {
1467 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 9);
1468 return;
1469 }
1470 mISDN_FsmChangeState(fi, ST_L2_8);
1471 transmit_enquiry(l2);
1472 l2->rc = 0;
1473 }
1474
1475 static void
1476 l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
1477 {
1478 struct layer2 *l2 = fi->userdata;
1479 struct sk_buff *skb, *nskb;
1480 u_char header[MAX_L2HEADER_LEN];
1481 u_int i, p1;
1482
1483 if (!cansend(l2))
1484 return;
1485
1486 skb = skb_dequeue(&l2->i_queue);
1487 if (!skb)
1488 return;
1489 i = sethdraddr(l2, header, CMD);
1490 if (test_bit(FLG_MOD128, &l2->flag)) {
1491 header[i++] = l2->vs << 1;
1492 header[i++] = l2->vr << 1;
1493 } else
1494 header[i++] = (l2->vr << 5) | (l2->vs << 1);
1495 nskb = skb_realloc_headroom(skb, i);
1496 if (!nskb) {
1497 printk(KERN_WARNING "%s: no headroom(%d) copy for IFrame\n",
1498 mISDNDevName4ch(&l2->ch), i);
1499 skb_queue_head(&l2->i_queue, skb);
1500 return;
1501 }
1502 if (test_bit(FLG_MOD128, &l2->flag)) {
1503 p1 = (l2->vs - l2->va) % 128;
1504 l2->vs = (l2->vs + 1) % 128;
1505 } else {
1506 p1 = (l2->vs - l2->va) % 8;
1507 l2->vs = (l2->vs + 1) % 8;
1508 }
1509 p1 = (p1 + l2->sow) % l2->window;
1510 if (l2->windowar[p1]) {
1511 printk(KERN_WARNING "%s: l2 try overwrite ack queue entry %d\n",
1512 mISDNDevName4ch(&l2->ch), p1);
1513 dev_kfree_skb(l2->windowar[p1]);
1514 }
1515 l2->windowar[p1] = skb;
1516 memcpy(skb_push(nskb, i), header, i);
1517 l2down(l2, PH_DATA_REQ, l2_newid(l2), nskb);
1518 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1519 if (!test_and_set_bit(FLG_T200_RUN, &l2->flag)) {
1520 mISDN_FsmDelTimer(&l2->t203, 13);
1521 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 11);
1522 }
1523 }
1524
1525 static void
1526 l2_st8_got_super(struct FsmInst *fi, int event, void *arg)
1527 {
1528 struct layer2 *l2 = fi->userdata;
1529 struct sk_buff *skb = arg;
1530 int PollFlag, rsp, rnr = 0;
1531 unsigned int nr;
1532
1533 rsp = *skb->data & 0x2;
1534 if (test_bit(FLG_ORIG, &l2->flag))
1535 rsp = !rsp;
1536
1537 skb_pull(skb, l2addrsize(l2));
1538
1539 if (IsRNR(skb->data, l2)) {
1540 set_peer_busy(l2);
1541 rnr = 1;
1542 } else
1543 clear_peer_busy(l2);
1544
1545 if (test_bit(FLG_MOD128, &l2->flag)) {
1546 PollFlag = (skb->data[1] & 0x1) == 0x1;
1547 nr = skb->data[1] >> 1;
1548 } else {
1549 PollFlag = (skb->data[0] & 0x10);
1550 nr = (skb->data[0] >> 5) & 0x7;
1551 }
1552 dev_kfree_skb(skb);
1553 if (rsp && PollFlag) {
1554 if (legalnr(l2, nr)) {
1555 if (rnr) {
1556 restart_t200(l2, 15);
1557 } else {
1558 stop_t200(l2, 16);
1559 mISDN_FsmAddTimer(&l2->t203, l2->T203,
1560 EV_L2_T203, NULL, 5);
1561 setva(l2, nr);
1562 }
1563 invoke_retransmission(l2, nr);
1564 mISDN_FsmChangeState(fi, ST_L2_7);
1565 if (skb_queue_len(&l2->i_queue) && cansend(l2))
1566 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL);
1567 } else
1568 nrerrorrecovery(fi);
1569 } else {
1570 if (!rsp && PollFlag)
1571 enquiry_response(l2);
1572 if (legalnr(l2, nr))
1573 setva(l2, nr);
1574 else
1575 nrerrorrecovery(fi);
1576 }
1577 }
1578
1579 static void
1580 l2_got_FRMR(struct FsmInst *fi, int event, void *arg)
1581 {
1582 struct layer2 *l2 = fi->userdata;
1583 struct sk_buff *skb = arg;
1584
1585 skb_pull(skb, l2addrsize(l2) + 1);
1586
1587 if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */
1588 (IsUA(skb->data) && (fi->state == ST_L2_7))) {
1589 l2mgr(l2, MDL_ERROR_IND, (void *) 'K');
1590 establishlink(fi);
1591 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1592 }
1593 dev_kfree_skb(skb);
1594 }
1595
1596 static void
1597 l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg)
1598 {
1599 struct layer2 *l2 = fi->userdata;
1600
1601 skb_queue_purge(&l2->ui_queue);
1602 l2->tei = GROUP_TEI;
1603 mISDN_FsmChangeState(fi, ST_L2_1);
1604 }
1605
1606 static void
1607 l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg)
1608 {
1609 struct layer2 *l2 = fi->userdata;
1610
1611 skb_queue_purge(&l2->ui_queue);
1612 l2->tei = GROUP_TEI;
1613 l2up_create(l2, DL_RELEASE_IND, 0, NULL);
1614 mISDN_FsmChangeState(fi, ST_L2_1);
1615 }
1616
1617 static void
1618 l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg)
1619 {
1620 struct layer2 *l2 = fi->userdata;
1621
1622 skb_queue_purge(&l2->i_queue);
1623 skb_queue_purge(&l2->ui_queue);
1624 freewin(l2);
1625 l2->tei = GROUP_TEI;
1626 stop_t200(l2, 17);
1627 st5_dl_release_l2l3(l2);
1628 mISDN_FsmChangeState(fi, ST_L2_1);
1629 }
1630
1631 static void
1632 l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg)
1633 {
1634 struct layer2 *l2 = fi->userdata;
1635
1636 skb_queue_purge(&l2->ui_queue);
1637 l2->tei = GROUP_TEI;
1638 stop_t200(l2, 18);
1639 l2up_create(l2, DL_RELEASE_IND, 0, NULL);
1640 mISDN_FsmChangeState(fi, ST_L2_1);
1641 }
1642
1643 static void
1644 l2_tei_remove(struct FsmInst *fi, int event, void *arg)
1645 {
1646 struct layer2 *l2 = fi->userdata;
1647
1648 skb_queue_purge(&l2->i_queue);
1649 skb_queue_purge(&l2->ui_queue);
1650 freewin(l2);
1651 l2->tei = GROUP_TEI;
1652 stop_t200(l2, 17);
1653 mISDN_FsmDelTimer(&l2->t203, 19);
1654 l2up_create(l2, DL_RELEASE_IND, 0, NULL);
1655 /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST,
1656 * MGR_SHORTSTATUS_IND, SSTATUS_L2_RELEASED,
1657 * 0, NULL, 0);
1658 */
1659 mISDN_FsmChangeState(fi, ST_L2_1);
1660 }
1661
1662 static void
1663 l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg)
1664 {
1665 struct layer2 *l2 = fi->userdata;
1666 struct sk_buff *skb = arg;
1667
1668 skb_queue_purge(&l2->i_queue);
1669 skb_queue_purge(&l2->ui_queue);
1670 if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag))
1671 l2up(l2, DL_RELEASE_IND, skb);
1672 else
1673 dev_kfree_skb(skb);
1674 }
1675
1676 static void
1677 l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg)
1678 {
1679 struct layer2 *l2 = fi->userdata;
1680 struct sk_buff *skb = arg;
1681
1682 skb_queue_purge(&l2->i_queue);
1683 skb_queue_purge(&l2->ui_queue);
1684 freewin(l2);
1685 stop_t200(l2, 19);
1686 st5_dl_release_l2l3(l2);
1687 mISDN_FsmChangeState(fi, ST_L2_4);
1688 if (l2->tm)
1689 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1690 dev_kfree_skb(skb);
1691 }
1692
1693 static void
1694 l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg)
1695 {
1696 struct layer2 *l2 = fi->userdata;
1697 struct sk_buff *skb = arg;
1698
1699 skb_queue_purge(&l2->ui_queue);
1700 stop_t200(l2, 20);
1701 l2up(l2, DL_RELEASE_CNF, skb);
1702 mISDN_FsmChangeState(fi, ST_L2_4);
1703 if (l2->tm)
1704 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1705 }
1706
1707 static void
1708 l2_persistent_da(struct FsmInst *fi, int event, void *arg)
1709 {
1710 struct layer2 *l2 = fi->userdata;
1711 struct sk_buff *skb = arg;
1712
1713 skb_queue_purge(&l2->i_queue);
1714 skb_queue_purge(&l2->ui_queue);
1715 freewin(l2);
1716 stop_t200(l2, 19);
1717 mISDN_FsmDelTimer(&l2->t203, 19);
1718 l2up(l2, DL_RELEASE_IND, skb);
1719 mISDN_FsmChangeState(fi, ST_L2_4);
1720 if (l2->tm)
1721 l2_tei(l2, MDL_STATUS_DOWN_IND, 0);
1722 }
1723
1724 static void
1725 l2_set_own_busy(struct FsmInst *fi, int event, void *arg)
1726 {
1727 struct layer2 *l2 = fi->userdata;
1728 struct sk_buff *skb = arg;
1729
1730 if (!test_and_set_bit(FLG_OWN_BUSY, &l2->flag)) {
1731 enquiry_cr(l2, RNR, RSP, 0);
1732 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1733 }
1734 if (skb)
1735 dev_kfree_skb(skb);
1736 }
1737
1738 static void
1739 l2_clear_own_busy(struct FsmInst *fi, int event, void *arg)
1740 {
1741 struct layer2 *l2 = fi->userdata;
1742 struct sk_buff *skb = arg;
1743
1744 if (!test_and_clear_bit(FLG_OWN_BUSY, &l2->flag)) {
1745 enquiry_cr(l2, RR, RSP, 0);
1746 test_and_clear_bit(FLG_ACK_PEND, &l2->flag);
1747 }
1748 if (skb)
1749 dev_kfree_skb(skb);
1750 }
1751
1752 static void
1753 l2_frame_error(struct FsmInst *fi, int event, void *arg)
1754 {
1755 struct layer2 *l2 = fi->userdata;
1756
1757 l2mgr(l2, MDL_ERROR_IND, arg);
1758 }
1759
1760 static void
1761 l2_frame_error_reest(struct FsmInst *fi, int event, void *arg)
1762 {
1763 struct layer2 *l2 = fi->userdata;
1764
1765 l2mgr(l2, MDL_ERROR_IND, arg);
1766 establishlink(fi);
1767 test_and_clear_bit(FLG_L3_INIT, &l2->flag);
1768 }
1769
1770 static struct FsmNode L2FnList[] =
1771 {
1772 {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign},
1773 {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3},
1774 {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish},
1775 {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3},
1776 {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1777 {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish},
1778 {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release},
1779 {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel},
1780 {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1781 {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect},
1782 {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest},
1783 {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull},
1784 {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue},
1785 {ST_L2_1, EV_L2_DL_UNITDATA, l2_queue_ui_assign},
1786 {ST_L2_2, EV_L2_DL_UNITDATA, l2_queue_ui},
1787 {ST_L2_3, EV_L2_DL_UNITDATA, l2_queue_ui},
1788 {ST_L2_4, EV_L2_DL_UNITDATA, l2_send_ui},
1789 {ST_L2_5, EV_L2_DL_UNITDATA, l2_send_ui},
1790 {ST_L2_6, EV_L2_DL_UNITDATA, l2_send_ui},
1791 {ST_L2_7, EV_L2_DL_UNITDATA, l2_send_ui},
1792 {ST_L2_8, EV_L2_DL_UNITDATA, l2_send_ui},
1793 {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei},
1794 {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei},
1795 {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei},
1796 {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove},
1797 {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove},
1798 {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove},
1799 {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove},
1800 {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove},
1801 {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove},
1802 {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove},
1803 {ST_L2_4, EV_L2_SABME, l2_start_multi},
1804 {ST_L2_5, EV_L2_SABME, l2_send_UA},
1805 {ST_L2_6, EV_L2_SABME, l2_send_DM},
1806 {ST_L2_7, EV_L2_SABME, l2_restart_multi},
1807 {ST_L2_8, EV_L2_SABME, l2_restart_multi},
1808 {ST_L2_4, EV_L2_DISC, l2_send_DM},
1809 {ST_L2_5, EV_L2_DISC, l2_send_DM},
1810 {ST_L2_6, EV_L2_DISC, l2_send_UA},
1811 {ST_L2_7, EV_L2_DISC, l2_stop_multi},
1812 {ST_L2_8, EV_L2_DISC, l2_stop_multi},
1813 {ST_L2_4, EV_L2_UA, l2_mdl_error_ua},
1814 {ST_L2_5, EV_L2_UA, l2_connected},
1815 {ST_L2_6, EV_L2_UA, l2_released},
1816 {ST_L2_7, EV_L2_UA, l2_mdl_error_ua},
1817 {ST_L2_8, EV_L2_UA, l2_mdl_error_ua},
1818 {ST_L2_4, EV_L2_DM, l2_reestablish},
1819 {ST_L2_5, EV_L2_DM, l2_st5_dm_release},
1820 {ST_L2_6, EV_L2_DM, l2_st6_dm_release},
1821 {ST_L2_7, EV_L2_DM, l2_mdl_error_dm},
1822 {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm},
1823 {ST_L2_1, EV_L2_UI, l2_got_ui},
1824 {ST_L2_2, EV_L2_UI, l2_got_ui},
1825 {ST_L2_3, EV_L2_UI, l2_got_ui},
1826 {ST_L2_4, EV_L2_UI, l2_got_ui},
1827 {ST_L2_5, EV_L2_UI, l2_got_ui},
1828 {ST_L2_6, EV_L2_UI, l2_got_ui},
1829 {ST_L2_7, EV_L2_UI, l2_got_ui},
1830 {ST_L2_8, EV_L2_UI, l2_got_ui},
1831 {ST_L2_7, EV_L2_FRMR, l2_got_FRMR},
1832 {ST_L2_8, EV_L2_FRMR, l2_got_FRMR},
1833 {ST_L2_7, EV_L2_SUPER, l2_st7_got_super},
1834 {ST_L2_8, EV_L2_SUPER, l2_st8_got_super},
1835 {ST_L2_7, EV_L2_I, l2_got_iframe},
1836 {ST_L2_8, EV_L2_I, l2_got_iframe},
1837 {ST_L2_5, EV_L2_T200, l2_timeout},
1838 {ST_L2_6, EV_L2_T200, l2_timeout},
1839 {ST_L2_7, EV_L2_T200, l2_timeout},
1840 {ST_L2_8, EV_L2_T200, l2_timeout},
1841 {ST_L2_7, EV_L2_T203, l2_timeout},
1842 {ST_L2_5, EV_L2_T200I, l2_st5_tout_200},
1843 {ST_L2_6, EV_L2_T200I, l2_st6_tout_200},
1844 {ST_L2_7, EV_L2_T200I, l2_st7_tout_200},
1845 {ST_L2_8, EV_L2_T200I, l2_st8_tout_200},
1846 {ST_L2_7, EV_L2_T203I, l2_st7_tout_203},
1847 {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue},
1848 {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1849 {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy},
1850 {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1851 {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy},
1852 {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error},
1853 {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error},
1854 {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error},
1855 {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1856 {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest},
1857 {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1858 {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove},
1859 {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove},
1860 {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da},
1861 {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da},
1862 {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da},
1863 {ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da},
1864 {ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da},
1865 };
1866
1867 static int
1868 ph_data_indication(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb)
1869 {
1870 u_char *datap = skb->data;
1871 int ret = -EINVAL;
1872 int psapi, ptei;
1873 u_int l;
1874 int c = 0;
1875
1876 l = l2addrsize(l2);
1877 if (skb->len <= l) {
1878 mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *) 'N');
1879 return ret;
1880 }
1881 if (test_bit(FLG_LAPD, &l2->flag)) { /* Maybe not needed */
1882 psapi = *datap++;
1883 ptei = *datap++;
1884 if ((psapi & 1) || !(ptei & 1)) {
1885 printk(KERN_WARNING
1886 "%s l2 D-channel frame wrong EA0/EA1\n",
1887 mISDNDevName4ch(&l2->ch));
1888 return ret;
1889 }
1890 psapi >>= 2;
1891 ptei >>= 1;
1892 if (psapi != l2->sapi) {
1893 /* not our business */
1894 if (*debug & DEBUG_L2)
1895 printk(KERN_DEBUG "%s: sapi %d/%d mismatch\n",
1896 mISDNDevName4ch(&l2->ch), psapi,
1897 l2->sapi);
1898 dev_kfree_skb(skb);
1899 return 0;
1900 }
1901 if ((ptei != l2->tei) && (ptei != GROUP_TEI)) {
1902 /* not our business */
1903 if (*debug & DEBUG_L2)
1904 printk(KERN_DEBUG "%s: tei %d/%d mismatch\n",
1905 mISDNDevName4ch(&l2->ch), ptei, l2->tei);
1906 dev_kfree_skb(skb);
1907 return 0;
1908 }
1909 } else
1910 datap += l;
1911 if (!(*datap & 1)) { /* I-Frame */
1912 c = iframe_error(l2, skb);
1913 if (!c)
1914 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_I, skb);
1915 } else if (IsSFrame(datap, l2)) { /* S-Frame */
1916 c = super_error(l2, skb);
1917 if (!c)
1918 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SUPER, skb);
1919 } else if (IsUI(datap)) {
1920 c = UI_error(l2, skb);
1921 if (!c)
1922 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UI, skb);
1923 } else if (IsSABME(datap, l2)) {
1924 c = unnum_error(l2, skb, CMD);
1925 if (!c)
1926 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SABME, skb);
1927 } else if (IsUA(datap)) {
1928 c = unnum_error(l2, skb, RSP);
1929 if (!c)
1930 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UA, skb);
1931 } else if (IsDISC(datap)) {
1932 c = unnum_error(l2, skb, CMD);
1933 if (!c)
1934 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DISC, skb);
1935 } else if (IsDM(datap)) {
1936 c = unnum_error(l2, skb, RSP);
1937 if (!c)
1938 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DM, skb);
1939 } else if (IsFRMR(datap)) {
1940 c = FRMR_error(l2, skb);
1941 if (!c)
1942 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_FRMR, skb);
1943 } else
1944 c = 'L';
1945 if (c) {
1946 printk(KERN_WARNING "%s:l2 D-channel frame error %c\n",
1947 mISDNDevName4ch(&l2->ch), c);
1948 mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *)(long)c);
1949 }
1950 return ret;
1951 }
1952
1953 static int
1954 l2_send(struct mISDNchannel *ch, struct sk_buff *skb)
1955 {
1956 struct layer2 *l2 = container_of(ch, struct layer2, ch);
1957 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1958 int ret = -EINVAL;
1959
1960 if (*debug & DEBUG_L2_RECV)
1961 printk(KERN_DEBUG "%s: %s prim(%x) id(%x) sapi(%d) tei(%d)\n",
1962 __func__, mISDNDevName4ch(&l2->ch), hh->prim, hh->id,
1963 l2->sapi, l2->tei);
1964 if (hh->prim == DL_INTERN_MSG) {
1965 struct mISDNhead *chh = hh + 1; /* saved copy */
1966
1967 *hh = *chh;
1968 if (*debug & DEBUG_L2_RECV)
1969 printk(KERN_DEBUG "%s: prim(%x) id(%x) internal msg\n",
1970 mISDNDevName4ch(&l2->ch), hh->prim, hh->id);
1971 }
1972 switch (hh->prim) {
1973 case PH_DATA_IND:
1974 ret = ph_data_indication(l2, hh, skb);
1975 break;
1976 case PH_DATA_CNF:
1977 ret = ph_data_confirm(l2, hh, skb);
1978 break;
1979 case PH_ACTIVATE_IND:
1980 test_and_set_bit(FLG_L1_ACTIV, &l2->flag);
1981 l2up_create(l2, MPH_ACTIVATE_IND, 0, NULL);
1982 if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag))
1983 ret = mISDN_FsmEvent(&l2->l2m,
1984 EV_L2_DL_ESTABLISH_REQ, skb);
1985 break;
1986 case PH_DEACTIVATE_IND:
1987 test_and_clear_bit(FLG_L1_ACTIV, &l2->flag);
1988 l2up_create(l2, MPH_DEACTIVATE_IND, 0, NULL);
1989 ret = mISDN_FsmEvent(&l2->l2m, EV_L1_DEACTIVATE, skb);
1990 break;
1991 case MPH_INFORMATION_IND:
1992 if (!l2->up)
1993 break;
1994 ret = l2->up->send(l2->up, skb);
1995 break;
1996 case DL_DATA_REQ:
1997 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_DATA, skb);
1998 break;
1999 case DL_UNITDATA_REQ:
2000 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_UNITDATA, skb);
2001 break;
2002 case DL_ESTABLISH_REQ:
2003 if (test_bit(FLG_LAPB, &l2->flag))
2004 test_and_set_bit(FLG_ORIG, &l2->flag);
2005 if (test_bit(FLG_L1_ACTIV, &l2->flag)) {
2006 if (test_bit(FLG_LAPD, &l2->flag) ||
2007 test_bit(FLG_ORIG, &l2->flag))
2008 ret = mISDN_FsmEvent(&l2->l2m,
2009 EV_L2_DL_ESTABLISH_REQ, skb);
2010 } else {
2011 if (test_bit(FLG_LAPD, &l2->flag) ||
2012 test_bit(FLG_ORIG, &l2->flag)) {
2013 test_and_set_bit(FLG_ESTAB_PEND,
2014 &l2->flag);
2015 }
2016 ret = l2down(l2, PH_ACTIVATE_REQ, l2_newid(l2),
2017 skb);
2018 }
2019 break;
2020 case DL_RELEASE_REQ:
2021 if (test_bit(FLG_LAPB, &l2->flag))
2022 l2down_create(l2, PH_DEACTIVATE_REQ,
2023 l2_newid(l2), 0, NULL);
2024 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_RELEASE_REQ,
2025 skb);
2026 break;
2027 case DL_TIMER200_IND:
2028 mISDN_FsmEvent(&l2->l2m, EV_L2_T200I, NULL);
2029 break;
2030 case DL_TIMER203_IND:
2031 mISDN_FsmEvent(&l2->l2m, EV_L2_T203I, NULL);
2032 break;
2033 default:
2034 if (*debug & DEBUG_L2)
2035 l2m_debug(&l2->l2m, "l2 unknown pr %04x",
2036 hh->prim);
2037 }
2038 if (ret) {
2039 dev_kfree_skb(skb);
2040 ret = 0;
2041 }
2042 return ret;
2043 }
2044
2045 int
2046 tei_l2(struct layer2 *l2, u_int cmd, u_long arg)
2047 {
2048 int ret = -EINVAL;
2049
2050 if (*debug & DEBUG_L2_TEI)
2051 printk(KERN_DEBUG "%s: cmd(%x) in %s\n",
2052 mISDNDevName4ch(&l2->ch), cmd, __func__);
2053 switch (cmd) {
2054 case (MDL_ASSIGN_REQ):
2055 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ASSIGN, (void *)arg);
2056 break;
2057 case (MDL_REMOVE_REQ):
2058 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_REMOVE, NULL);
2059 break;
2060 case (MDL_ERROR_IND):
2061 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL);
2062 break;
2063 case (MDL_ERROR_RSP):
2064 /* ETS 300-125 5.3.2.1 Test: TC13010 */
2065 printk(KERN_NOTICE "%s: MDL_ERROR|REQ (tei_l2)\n",
2066 mISDNDevName4ch(&l2->ch));
2067 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL);
2068 break;
2069 }
2070 return ret;
2071 }
2072
2073 static void
2074 release_l2(struct layer2 *l2)
2075 {
2076 mISDN_FsmDelTimer(&l2->t200, 21);
2077 mISDN_FsmDelTimer(&l2->t203, 16);
2078 skb_queue_purge(&l2->i_queue);
2079 skb_queue_purge(&l2->ui_queue);
2080 skb_queue_purge(&l2->down_queue);
2081 ReleaseWin(l2);
2082 if (test_bit(FLG_LAPD, &l2->flag)) {
2083 TEIrelease(l2);
2084 if (l2->ch.st)
2085 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D,
2086 CLOSE_CHANNEL, NULL);
2087 }
2088 kfree(l2);
2089 }
2090
2091 static int
2092 l2_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
2093 {
2094 struct layer2 *l2 = container_of(ch, struct layer2, ch);
2095 u_int info;
2096
2097 if (*debug & DEBUG_L2_CTRL)
2098 printk(KERN_DEBUG "%s: %s cmd(%x)\n",
2099 mISDNDevName4ch(ch), __func__, cmd);
2100
2101 switch (cmd) {
2102 case OPEN_CHANNEL:
2103 if (test_bit(FLG_LAPD, &l2->flag)) {
2104 set_channel_address(&l2->ch, l2->sapi, l2->tei);
2105 info = DL_INFO_L2_CONNECT;
2106 l2up_create(l2, DL_INFORMATION_IND,
2107 sizeof(info), &info);
2108 }
2109 break;
2110 case CLOSE_CHANNEL:
2111 if (l2->ch.peer)
2112 l2->ch.peer->ctrl(l2->ch.peer, CLOSE_CHANNEL, NULL);
2113 release_l2(l2);
2114 break;
2115 }
2116 return 0;
2117 }
2118
2119 struct layer2 *
2120 create_l2(struct mISDNchannel *ch, u_int protocol, u_long options, int tei,
2121 int sapi)
2122 {
2123 struct layer2 *l2;
2124 struct channel_req rq;
2125
2126 l2 = kzalloc(sizeof(struct layer2), GFP_KERNEL);
2127 if (!l2) {
2128 printk(KERN_ERR "kzalloc layer2 failed\n");
2129 return NULL;
2130 }
2131 l2->next_id = 1;
2132 l2->down_id = MISDN_ID_NONE;
2133 l2->up = ch;
2134 l2->ch.st = ch->st;
2135 l2->ch.send = l2_send;
2136 l2->ch.ctrl = l2_ctrl;
2137 switch (protocol) {
2138 case ISDN_P_LAPD_NT:
2139 test_and_set_bit(FLG_LAPD, &l2->flag);
2140 test_and_set_bit(FLG_LAPD_NET, &l2->flag);
2141 test_and_set_bit(FLG_MOD128, &l2->flag);
2142 l2->sapi = sapi;
2143 l2->maxlen = MAX_DFRAME_LEN;
2144 if (test_bit(OPTION_L2_PMX, &options))
2145 l2->window = 7;
2146 else
2147 l2->window = 1;
2148 if (test_bit(OPTION_L2_PTP, &options))
2149 test_and_set_bit(FLG_PTP, &l2->flag);
2150 if (test_bit(OPTION_L2_FIXEDTEI, &options))
2151 test_and_set_bit(FLG_FIXED_TEI, &l2->flag);
2152 l2->tei = tei;
2153 l2->T200 = 1000;
2154 l2->N200 = 3;
2155 l2->T203 = 10000;
2156 if (test_bit(OPTION_L2_PMX, &options))
2157 rq.protocol = ISDN_P_NT_E1;
2158 else
2159 rq.protocol = ISDN_P_NT_S0;
2160 rq.adr.channel = 0;
2161 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq);
2162 break;
2163 case ISDN_P_LAPD_TE:
2164 test_and_set_bit(FLG_LAPD, &l2->flag);
2165 test_and_set_bit(FLG_MOD128, &l2->flag);
2166 test_and_set_bit(FLG_ORIG, &l2->flag);
2167 l2->sapi = sapi;
2168 l2->maxlen = MAX_DFRAME_LEN;
2169 if (test_bit(OPTION_L2_PMX, &options))
2170 l2->window = 7;
2171 else
2172 l2->window = 1;
2173 if (test_bit(OPTION_L2_PTP, &options))
2174 test_and_set_bit(FLG_PTP, &l2->flag);
2175 if (test_bit(OPTION_L2_FIXEDTEI, &options))
2176 test_and_set_bit(FLG_FIXED_TEI, &l2->flag);
2177 l2->tei = tei;
2178 l2->T200 = 1000;
2179 l2->N200 = 3;
2180 l2->T203 = 10000;
2181 if (test_bit(OPTION_L2_PMX, &options))
2182 rq.protocol = ISDN_P_TE_E1;
2183 else
2184 rq.protocol = ISDN_P_TE_S0;
2185 rq.adr.channel = 0;
2186 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq);
2187 break;
2188 case ISDN_P_B_X75SLP:
2189 test_and_set_bit(FLG_LAPB, &l2->flag);
2190 l2->window = 7;
2191 l2->maxlen = MAX_DATA_SIZE;
2192 l2->T200 = 1000;
2193 l2->N200 = 4;
2194 l2->T203 = 5000;
2195 l2->addr.A = 3;
2196 l2->addr.B = 1;
2197 break;
2198 default:
2199 printk(KERN_ERR "layer2 create failed prt %x\n",
2200 protocol);
2201 kfree(l2);
2202 return NULL;
2203 }
2204 skb_queue_head_init(&l2->i_queue);
2205 skb_queue_head_init(&l2->ui_queue);
2206 skb_queue_head_init(&l2->down_queue);
2207 skb_queue_head_init(&l2->tmp_queue);
2208 InitWin(l2);
2209 l2->l2m.fsm = &l2fsm;
2210 if (test_bit(FLG_LAPB, &l2->flag) ||
2211 test_bit(FLG_FIXED_TEI, &l2->flag) ||
2212 test_bit(FLG_LAPD_NET, &l2->flag))
2213 l2->l2m.state = ST_L2_4;
2214 else
2215 l2->l2m.state = ST_L2_1;
2216 l2->l2m.debug = *debug;
2217 l2->l2m.userdata = l2;
2218 l2->l2m.userint = 0;
2219 l2->l2m.printdebug = l2m_debug;
2220
2221 mISDN_FsmInitTimer(&l2->l2m, &l2->t200);
2222 mISDN_FsmInitTimer(&l2->l2m, &l2->t203);
2223 return l2;
2224 }
2225
2226 static int
2227 x75create(struct channel_req *crq)
2228 {
2229 struct layer2 *l2;
2230
2231 if (crq->protocol != ISDN_P_B_X75SLP)
2232 return -EPROTONOSUPPORT;
2233 l2 = create_l2(crq->ch, crq->protocol, 0, 0, 0);
2234 if (!l2)
2235 return -ENOMEM;
2236 crq->ch = &l2->ch;
2237 crq->protocol = ISDN_P_B_HDLC;
2238 return 0;
2239 }
2240
2241 static struct Bprotocol X75SLP = {
2242 .Bprotocols = (1 << (ISDN_P_B_X75SLP & ISDN_P_B_MASK)),
2243 .name = "X75SLP",
2244 .create = x75create
2245 };
2246
2247 int
2248 Isdnl2_Init(u_int *deb)
2249 {
2250 int res;
2251 debug = deb;
2252 mISDN_register_Bprotocol(&X75SLP);
2253 l2fsm.state_count = L2_STATE_COUNT;
2254 l2fsm.event_count = L2_EVENT_COUNT;
2255 l2fsm.strEvent = strL2Event;
2256 l2fsm.strState = strL2State;
2257 res = mISDN_FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList));
2258 if (res)
2259 goto error;
2260 res = TEIInit(deb);
2261 if (res)
2262 goto error_fsm;
2263 return 0;
2264
2265 error_fsm:
2266 mISDN_FsmFree(&l2fsm);
2267 error:
2268 mISDN_unregister_Bprotocol(&X75SLP);
2269 return res;
2270 }
2271
2272 void
2273 Isdnl2_cleanup(void)
2274 {
2275 mISDN_unregister_Bprotocol(&X75SLP);
2276 TEIFree();
2277 mISDN_FsmFree(&l2fsm);
2278 }
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