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