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Linux 2.6.26-rc1
[cris-mirror.git] / drivers / isdn / hisax / isdnl3.c
blob935f23356fae645c2a3d91af6e8349778c674212
1 /* $Id: isdnl3.c,v 2.22.2.3 2004/01/13 14:31:25 keil Exp $
2 *
3 * Author Karsten Keil
4 * based on the teles driver from Jan den Ouden
5 * Copyright by Karsten Keil <keil@isdn4linux.de>
6 *
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
9 *
10 * For changes and modifications please read
11 * Documentation/isdn/HiSax.cert
12 *
13 * Thanks to Jan den Ouden
14 * Fritz Elfert
15 *
16 */
17
18 #include <linux/init.h>
19 #include "hisax.h"
20 #include "isdnl3.h"
21
22 const char *l3_revision = "$Revision: 2.22.2.3 $";
23
24 static struct Fsm l3fsm;
25
26 enum {
27 ST_L3_LC_REL,
28 ST_L3_LC_ESTAB_WAIT,
29 ST_L3_LC_REL_DELAY,
30 ST_L3_LC_REL_WAIT,
31 ST_L3_LC_ESTAB,
32 };
33
34 #define L3_STATE_COUNT (ST_L3_LC_ESTAB+1)
35
36 static char *strL3State[] =
37 {
38 "ST_L3_LC_REL",
39 "ST_L3_LC_ESTAB_WAIT",
40 "ST_L3_LC_REL_DELAY",
41 "ST_L3_LC_REL_WAIT",
42 "ST_L3_LC_ESTAB",
43 };
44
45 enum {
46 EV_ESTABLISH_REQ,
47 EV_ESTABLISH_IND,
48 EV_ESTABLISH_CNF,
49 EV_RELEASE_REQ,
50 EV_RELEASE_CNF,
51 EV_RELEASE_IND,
52 EV_TIMEOUT,
53 };
54
55 #define L3_EVENT_COUNT (EV_TIMEOUT+1)
56
57 static char *strL3Event[] =
58 {
59 "EV_ESTABLISH_REQ",
60 "EV_ESTABLISH_IND",
61 "EV_ESTABLISH_CNF",
62 "EV_RELEASE_REQ",
63 "EV_RELEASE_CNF",
64 "EV_RELEASE_IND",
65 "EV_TIMEOUT",
66 };
67
68 static void
69 l3m_debug(struct FsmInst *fi, char *fmt, ...)
70 {
71 va_list args;
72 struct PStack *st = fi->userdata;
73
74 va_start(args, fmt);
75 VHiSax_putstatus(st->l1.hardware, st->l3.debug_id, fmt, args);
76 va_end(args);
77 }
78
79 u_char *
80 findie(u_char * p, int size, u_char ie, int wanted_set)
81 {
82 int l, codeset, maincodeset;
83 u_char *pend = p + size;
84
85 /* skip protocol discriminator, callref and message type */
86 p++;
87 l = (*p++) & 0xf;
88 p += l;
89 p++;
90 codeset = 0;
91 maincodeset = 0;
92 /* while there are bytes left... */
93 while (p < pend) {
94 if ((*p & 0xf0) == 0x90) {
95 codeset = *p & 0x07;
96 if (!(*p & 0x08))
97 maincodeset = codeset;
98 }
99 if (*p & 0x80)
100 p++;
101 else {
102 if (codeset == wanted_set) {
103 if (*p == ie)
104 { /* improved length check (Werner Cornelius) */
105 if ((pend - p) < 2)
106 return(NULL);
107 if (*(p+1) > (pend - (p+2)))
108 return(NULL);
109 return (p);
110 }
111
112 if (*p > ie)
113 return (NULL);
114 }
115 p++;
116 l = *p++;
117 p += l;
118 codeset = maincodeset;
119 }
120 }
121 return (NULL);
122 }
123
124 int
125 getcallref(u_char * p)
126 {
127 int l, cr = 0;
128
129 p++; /* prot discr */
130 if (*p & 0xfe) /* wrong callref BRI only 1 octet*/
131 return(-2);
132 l = 0xf & *p++; /* callref length */
133 if (!l) /* dummy CallRef */
134 return(-1);
135 cr = *p++;
136 return (cr);
137 }
138
139 static int OrigCallRef = 0;
140
141 int
142 newcallref(void)
143 {
144 if (OrigCallRef == 127)
145 OrigCallRef = 1;
146 else
147 OrigCallRef++;
148 return (OrigCallRef);
149 }
150
151 void
152 newl3state(struct l3_process *pc, int state)
153 {
154 if (pc->debug & L3_DEB_STATE)
155 l3_debug(pc->st, "newstate cr %d %d --> %d",
156 pc->callref & 0x7F,
157 pc->state, state);
158 pc->state = state;
159 }
160
161 static void
162 L3ExpireTimer(struct L3Timer *t)
163 {
164 t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc);
165 }
166
167 void
168 L3InitTimer(struct l3_process *pc, struct L3Timer *t)
169 {
170 t->pc = pc;
171 t->tl.function = (void *) L3ExpireTimer;
172 t->tl.data = (long) t;
173 init_timer(&t->tl);
174 }
175
176 void
177 L3DelTimer(struct L3Timer *t)
178 {
179 del_timer(&t->tl);
180 }
181
182 int
183 L3AddTimer(struct L3Timer *t,
184 int millisec, int event)
185 {
186 if (timer_pending(&t->tl)) {
187 printk(KERN_WARNING "L3AddTimer: timer already active!\n");
188 return -1;
189 }
190 init_timer(&t->tl);
191 t->event = event;
192 t->tl.expires = jiffies + (millisec * HZ) / 1000;
193 add_timer(&t->tl);
194 return 0;
195 }
196
197 void
198 StopAllL3Timer(struct l3_process *pc)
199 {
200 L3DelTimer(&pc->timer);
201 }
202
203 struct sk_buff *
204 l3_alloc_skb(int len)
205 {
206 struct sk_buff *skb;
207
208 if (!(skb = alloc_skb(len + MAX_HEADER_LEN, GFP_ATOMIC))) {
209 printk(KERN_WARNING "HiSax: No skb for D-channel\n");
210 return (NULL);
211 }
212 skb_reserve(skb, MAX_HEADER_LEN);
213 return (skb);
214 }
215
216 static void
217 no_l3_proto(struct PStack *st, int pr, void *arg)
218 {
219 struct sk_buff *skb = arg;
220
221 HiSax_putstatus(st->l1.hardware, "L3", "no D protocol");
222 if (skb) {
223 dev_kfree_skb(skb);
224 }
225 }
226
227 static int
228 no_l3_proto_spec(struct PStack *st, isdn_ctrl *ic)
229 {
230 printk(KERN_WARNING "HiSax: no specific protocol handler for proto %lu\n",ic->arg & 0xFF);
231 return(-1);
232 }
233
234 struct l3_process
235 *getl3proc(struct PStack *st, int cr)
236 {
237 struct l3_process *p = st->l3.proc;
238
239 while (p)
240 if (p->callref == cr)
241 return (p);
242 else
243 p = p->next;
244 return (NULL);
245 }
246
247 struct l3_process
248 *new_l3_process(struct PStack *st, int cr)
249 {
250 struct l3_process *p, *np;
251
252 if (!(p = kmalloc(sizeof(struct l3_process), GFP_ATOMIC))) {
253 printk(KERN_ERR "HiSax can't get memory for cr %d\n", cr);
254 return (NULL);
255 }
256 if (!st->l3.proc)
257 st->l3.proc = p;
258 else {
259 np = st->l3.proc;
260 while (np->next)
261 np = np->next;
262 np->next = p;
263 }
264 p->next = NULL;
265 p->debug = st->l3.debug;
266 p->callref = cr;
267 p->state = 0;
268 p->chan = NULL;
269 p->st = st;
270 p->N303 = st->l3.N303;
271 L3InitTimer(p, &p->timer);
272 return (p);
273 };
274
275 void
276 release_l3_process(struct l3_process *p)
277 {
278 struct l3_process *np, *pp = NULL;
279
280 if (!p)
281 return;
282 np = p->st->l3.proc;
283 while (np) {
284 if (np == p) {
285 StopAllL3Timer(p);
286 if (pp)
287 pp->next = np->next;
288 else if (!(p->st->l3.proc = np->next) &&
289 !test_bit(FLG_PTP, &p->st->l2.flag)) {
290 if (p->debug)
291 l3_debug(p->st, "release_l3_process: last process");
292 if (skb_queue_empty(&p->st->l3.squeue)) {
293 if (p->debug)
294 l3_debug(p->st, "release_l3_process: release link");
295 if (p->st->protocol != ISDN_PTYPE_NI1)
296 FsmEvent(&p->st->l3.l3m, EV_RELEASE_REQ, NULL);
297 else
298 FsmEvent(&p->st->l3.l3m, EV_RELEASE_IND, NULL);
299 } else {
300 if (p->debug)
301 l3_debug(p->st, "release_l3_process: not release link");
302 }
303 }
304 kfree(p);
305 return;
306 }
307 pp = np;
308 np = np->next;
309 }
310 printk(KERN_ERR "HiSax internal L3 error CR(%d) not in list\n", p->callref);
311 l3_debug(p->st, "HiSax internal L3 error CR(%d) not in list", p->callref);
312 };
313
314 static void
315 l3ml3p(struct PStack *st, int pr)
316 {
317 struct l3_process *p = st->l3.proc;
318 struct l3_process *np;
319
320 while (p) {
321 /* p might be kfreed under us, so we need to save where we want to go on */
322 np = p->next;
323 st->l3.l3ml3(st, pr, p);
324 p = np;
325 }
326 }
327
328 void
329 setstack_l3dc(struct PStack *st, struct Channel *chanp)
330 {
331 char tmp[64];
332
333 st->l3.proc = NULL;
334 st->l3.global = NULL;
335 skb_queue_head_init(&st->l3.squeue);
336 st->l3.l3m.fsm = &l3fsm;
337 st->l3.l3m.state = ST_L3_LC_REL;
338 st->l3.l3m.debug = 1;
339 st->l3.l3m.userdata = st;
340 st->l3.l3m.userint = 0;
341 st->l3.l3m.printdebug = l3m_debug;
342 FsmInitTimer(&st->l3.l3m, &st->l3.l3m_timer);
343 strcpy(st->l3.debug_id, "L3DC ");
344 st->lli.l4l3_proto = no_l3_proto_spec;
345
346 #ifdef CONFIG_HISAX_EURO
347 if (st->protocol == ISDN_PTYPE_EURO) {
348 setstack_dss1(st);
349 } else
350 #endif
351 #ifdef CONFIG_HISAX_NI1
352 if (st->protocol == ISDN_PTYPE_NI1) {
353 setstack_ni1(st);
354 } else
355 #endif
356 #ifdef CONFIG_HISAX_1TR6
357 if (st->protocol == ISDN_PTYPE_1TR6) {
358 setstack_1tr6(st);
359 } else
360 #endif
361 if (st->protocol == ISDN_PTYPE_LEASED) {
362 st->lli.l4l3 = no_l3_proto;
363 st->l2.l2l3 = no_l3_proto;
364 st->l3.l3ml3 = no_l3_proto;
365 printk(KERN_INFO "HiSax: Leased line mode\n");
366 } else {
367 st->lli.l4l3 = no_l3_proto;
368 st->l2.l2l3 = no_l3_proto;
369 st->l3.l3ml3 = no_l3_proto;
370 sprintf(tmp, "protocol %s not supported",
371 (st->protocol == ISDN_PTYPE_1TR6) ? "1tr6" :
372 (st->protocol == ISDN_PTYPE_EURO) ? "euro" :
373 (st->protocol == ISDN_PTYPE_NI1) ? "ni1" :
374 "unknown");
375 printk(KERN_WARNING "HiSax: %s\n", tmp);
376 st->protocol = -1;
377 }
378 }
379
380 static void
381 isdnl3_trans(struct PStack *st, int pr, void *arg) {
382 st->l3.l3l2(st, pr, arg);
383 }
384
385 void
386 releasestack_isdnl3(struct PStack *st)
387 {
388 while (st->l3.proc)
389 release_l3_process(st->l3.proc);
390 if (st->l3.global) {
391 StopAllL3Timer(st->l3.global);
392 kfree(st->l3.global);
393 st->l3.global = NULL;
394 }
395 FsmDelTimer(&st->l3.l3m_timer, 54);
396 skb_queue_purge(&st->l3.squeue);
397 }
398
399 void
400 setstack_l3bc(struct PStack *st, struct Channel *chanp)
401 {
402
403 st->l3.proc = NULL;
404 st->l3.global = NULL;
405 skb_queue_head_init(&st->l3.squeue);
406 st->l3.l3m.fsm = &l3fsm;
407 st->l3.l3m.state = ST_L3_LC_REL;
408 st->l3.l3m.debug = 1;
409 st->l3.l3m.userdata = st;
410 st->l3.l3m.userint = 0;
411 st->l3.l3m.printdebug = l3m_debug;
412 strcpy(st->l3.debug_id, "L3BC ");
413 st->lli.l4l3 = isdnl3_trans;
414 }
415
416 #define DREL_TIMER_VALUE 40000
417
418 static void
419 lc_activate(struct FsmInst *fi, int event, void *arg)
420 {
421 struct PStack *st = fi->userdata;
422
423 FsmChangeState(fi, ST_L3_LC_ESTAB_WAIT);
424 st->l3.l3l2(st, DL_ESTABLISH | REQUEST, NULL);
425 }
426
427 static void
428 lc_connect(struct FsmInst *fi, int event, void *arg)
429 {
430 struct PStack *st = fi->userdata;
431 struct sk_buff *skb = arg;
432 int dequeued = 0;
433
434 FsmChangeState(fi, ST_L3_LC_ESTAB);
435 while ((skb = skb_dequeue(&st->l3.squeue))) {
436 st->l3.l3l2(st, DL_DATA | REQUEST, skb);
437 dequeued++;
438 }
439 if ((!st->l3.proc) && dequeued) {
440 if (st->l3.debug)
441 l3_debug(st, "lc_connect: release link");
442 FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
443 } else
444 l3ml3p(st, DL_ESTABLISH | INDICATION);
445 }
446
447 static void
448 lc_connected(struct FsmInst *fi, int event, void *arg)
449 {
450 struct PStack *st = fi->userdata;
451 struct sk_buff *skb = arg;
452 int dequeued = 0;
453
454 FsmDelTimer(&st->l3.l3m_timer, 51);
455 FsmChangeState(fi, ST_L3_LC_ESTAB);
456 while ((skb = skb_dequeue(&st->l3.squeue))) {
457 st->l3.l3l2(st, DL_DATA | REQUEST, skb);
458 dequeued++;
459 }
460 if ((!st->l3.proc) && dequeued) {
461 if (st->l3.debug)
462 l3_debug(st, "lc_connected: release link");
463 FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
464 } else
465 l3ml3p(st, DL_ESTABLISH | CONFIRM);
466 }
467
468 static void
469 lc_start_delay(struct FsmInst *fi, int event, void *arg)
470 {
471 struct PStack *st = fi->userdata;
472
473 FsmChangeState(fi, ST_L3_LC_REL_DELAY);
474 FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
475 }
476
477 static void
478 lc_start_delay_check(struct FsmInst *fi, int event, void *arg)
479 /* 20/09/00 - GE timer not user for NI-1 as layer 2 should stay up */
480 {
481 struct PStack *st = fi->userdata;
482
483 FsmChangeState(fi, ST_L3_LC_REL_DELAY);
484 /* 19/09/00 - GE timer not user for NI-1 */
485 if (st->protocol != ISDN_PTYPE_NI1)
486 FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
487 }
488
489 static void
490 lc_release_req(struct FsmInst *fi, int event, void *arg)
491 {
492 struct PStack *st = fi->userdata;
493
494 if (test_bit(FLG_L2BLOCK, &st->l2.flag)) {
495 if (st->l3.debug)
496 l3_debug(st, "lc_release_req: l2 blocked");
497 /* restart release timer */
498 FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 51);
499 } else {
500 FsmChangeState(fi, ST_L3_LC_REL_WAIT);
501 st->l3.l3l2(st, DL_RELEASE | REQUEST, NULL);
502 }
503 }
504
505 static void
506 lc_release_ind(struct FsmInst *fi, int event, void *arg)
507 {
508 struct PStack *st = fi->userdata;
509
510 FsmDelTimer(&st->l3.l3m_timer, 52);
511 FsmChangeState(fi, ST_L3_LC_REL);
512 skb_queue_purge(&st->l3.squeue);
513 l3ml3p(st, DL_RELEASE | INDICATION);
514 }
515
516 static void
517 lc_release_cnf(struct FsmInst *fi, int event, void *arg)
518 {
519 struct PStack *st = fi->userdata;
520
521 FsmChangeState(fi, ST_L3_LC_REL);
522 skb_queue_purge(&st->l3.squeue);
523 l3ml3p(st, DL_RELEASE | CONFIRM);
524 }
525
526
527 /* *INDENT-OFF* */
528 static struct FsmNode L3FnList[] __initdata =
529 {
530 {ST_L3_LC_REL, EV_ESTABLISH_REQ, lc_activate},
531 {ST_L3_LC_REL, EV_ESTABLISH_IND, lc_connect},
532 {ST_L3_LC_REL, EV_ESTABLISH_CNF, lc_connect},
533 {ST_L3_LC_ESTAB_WAIT, EV_ESTABLISH_CNF, lc_connected},
534 {ST_L3_LC_ESTAB_WAIT, EV_RELEASE_REQ, lc_start_delay},
535 {ST_L3_LC_ESTAB_WAIT, EV_RELEASE_IND, lc_release_ind},
536 {ST_L3_LC_ESTAB, EV_RELEASE_IND, lc_release_ind},
537 {ST_L3_LC_ESTAB, EV_RELEASE_REQ, lc_start_delay_check},
538 {ST_L3_LC_REL_DELAY, EV_RELEASE_IND, lc_release_ind},
539 {ST_L3_LC_REL_DELAY, EV_ESTABLISH_REQ, lc_connected},
540 {ST_L3_LC_REL_DELAY, EV_TIMEOUT, lc_release_req},
541 {ST_L3_LC_REL_WAIT, EV_RELEASE_CNF, lc_release_cnf},
542 {ST_L3_LC_REL_WAIT, EV_ESTABLISH_REQ, lc_activate},
543 };
544 /* *INDENT-ON* */
545
546 #define L3_FN_COUNT (sizeof(L3FnList)/sizeof(struct FsmNode))
547
548 void
549 l3_msg(struct PStack *st, int pr, void *arg)
550 {
551 switch (pr) {
552 case (DL_DATA | REQUEST):
553 if (st->l3.l3m.state == ST_L3_LC_ESTAB) {
554 st->l3.l3l2(st, pr, arg);
555 } else {
556 struct sk_buff *skb = arg;
557
558 skb_queue_tail(&st->l3.squeue, skb);
559 FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL);
560 }
561 break;
562 case (DL_ESTABLISH | REQUEST):
563 FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL);
564 break;
565 case (DL_ESTABLISH | CONFIRM):
566 FsmEvent(&st->l3.l3m, EV_ESTABLISH_CNF, NULL);
567 break;
568 case (DL_ESTABLISH | INDICATION):
569 FsmEvent(&st->l3.l3m, EV_ESTABLISH_IND, NULL);
570 break;
571 case (DL_RELEASE | INDICATION):
572 FsmEvent(&st->l3.l3m, EV_RELEASE_IND, NULL);
573 break;
574 case (DL_RELEASE | CONFIRM):
575 FsmEvent(&st->l3.l3m, EV_RELEASE_CNF, NULL);
576 break;
577 case (DL_RELEASE | REQUEST):
578 FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
579 break;
580 }
581 }
582
583 int __init
584 Isdnl3New(void)
585 {
586 l3fsm.state_count = L3_STATE_COUNT;
587 l3fsm.event_count = L3_EVENT_COUNT;
588 l3fsm.strEvent = strL3Event;
589 l3fsm.strState = strL3State;
590 return FsmNew(&l3fsm, L3FnList, L3_FN_COUNT);
591 }
592
593 void
594 Isdnl3Free(void)
595 {
596 FsmFree(&l3fsm);
597 }
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