summaryrefslogtreecommitdiffstats
path: root/drivers/isdn/divert/isdn_divert.c
blob: 6f423bc49d0dcfa0a0bd4ef9321213dbd14de07e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
/* $Id: isdn_divert.c,v 1.6.6.3 2001/09/23 22:24:36 kai Exp $
 *
 * DSS1 main diversion supplementary handling for i4l.
 *
 * Copyright 1999       by Werner Cornelius (werner@isdn4linux.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/jiffies.h>

#include "isdn_divert.h"

/**********************************/
/* structure keeping calling info */
/**********************************/
struct call_struc {
	isdn_ctrl ics; /* delivered setup + driver parameters */
	ulong divert_id; /* Id delivered to user */
	unsigned char akt_state; /* actual state */
	char deflect_dest[35]; /* deflection destination */
	struct timer_list timer; /* timer control structure */
	char info[90]; /* device info output */
	struct call_struc *next; /* pointer to next entry */
	struct call_struc *prev;
};


/********************************************/
/* structure keeping deflection table entry */
/********************************************/
struct deflect_struc {
	struct deflect_struc *next, *prev;
	divert_rule rule; /* used rule */
};


/*****************************************/
/* variables for main diversion services */
/*****************************************/
/* diversion/deflection processes */
static struct call_struc *divert_head = NULL; /* head of remembered entrys */
static ulong next_id = 1; /* next info id */
static struct deflect_struc *table_head = NULL;
static struct deflect_struc *table_tail = NULL;
static unsigned char extern_wait_max = 4; /* maximum wait in s for external process */

DEFINE_SPINLOCK(divert_lock);

/***************************/
/* timer callback function */
/***************************/
static void deflect_timer_expire(ulong arg)
{
	unsigned long flags;
	struct call_struc *cs = (struct call_struc *) arg;

	spin_lock_irqsave(&divert_lock, flags);
	del_timer(&cs->timer); /* delete active timer */
	spin_unlock_irqrestore(&divert_lock, flags);

	switch (cs->akt_state) {
	case DEFLECT_PROCEED:
		cs->ics.command = ISDN_CMD_HANGUP; /* cancel action */
		divert_if.ll_cmd(&cs->ics);
		spin_lock_irqsave(&divert_lock, flags);
		cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
		cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
		add_timer(&cs->timer);
		spin_unlock_irqrestore(&divert_lock, flags);
		break;

	case DEFLECT_ALERT:
		cs->ics.command = ISDN_CMD_REDIR; /* protocol */
		strlcpy(cs->ics.parm.setup.phone, cs->deflect_dest, sizeof(cs->ics.parm.setup.phone));
		strcpy(cs->ics.parm.setup.eazmsn, "Testtext delayed");
		divert_if.ll_cmd(&cs->ics);
		spin_lock_irqsave(&divert_lock, flags);
		cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
		cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
		add_timer(&cs->timer);
		spin_unlock_irqrestore(&divert_lock, flags);
		break;

	case DEFLECT_AUTODEL:
	default:
		spin_lock_irqsave(&divert_lock, flags);
		if (cs->prev)
			cs->prev->next = cs->next; /* forward link */
		else
			divert_head = cs->next;
		if (cs->next)
			cs->next->prev = cs->prev; /* back link */
		spin_unlock_irqrestore(&divert_lock, flags);
		kfree(cs);
		return;

	} /* switch */
} /* deflect_timer_func */


/*****************************************/
/* handle call forwarding de/activations */
/* 0 = deact, 1 = act, 2 = interrogate   */
/*****************************************/
int cf_command(int drvid, int mode,
	       u_char proc, char *msn,
	       u_char service, char *fwd_nr, ulong *procid)
{
	unsigned long flags;
	int retval, msnlen;
	int fwd_len;
	char *p, *ielenp, tmp[60];
	struct call_struc *cs;

	if (strchr(msn, '.')) return (-EINVAL); /* subaddress not allowed in msn */
	if ((proc & 0x7F) > 2) return (-EINVAL);
	proc &= 3;
	p = tmp;
	*p++ = 0x30; /* enumeration */
	ielenp = p++; /* remember total length position */
	*p++ = 0xa; /* proc tag */
	*p++ = 1;   /* length */
	*p++ = proc & 0x7F; /* procedure to de/activate/interrogate */
	*p++ = 0xa; /* service tag */
	*p++ = 1;   /* length */
	*p++ = service; /* service to handle */

	if (mode == 1) {
		if (!*fwd_nr) return (-EINVAL); /* destination missing */
		if (strchr(fwd_nr, '.')) return (-EINVAL); /* subaddress not allowed */
		fwd_len = strlen(fwd_nr);
		*p++ = 0x30; /* number enumeration */
		*p++ = fwd_len + 2; /* complete forward to len */
		*p++ = 0x80; /* fwd to nr */
		*p++ = fwd_len; /* length of number */
		strcpy(p, fwd_nr); /* copy number */
		p += fwd_len; /* pointer beyond fwd */
	} /* activate */

	msnlen = strlen(msn);
	*p++ = 0x80; /* msn number */
	if (msnlen > 1) {
		*p++ = msnlen; /* length */
		strcpy(p, msn);
		p += msnlen;
	} else
		*p++ = 0;

	*ielenp = p - ielenp - 1; /* set total IE length */

	/* allocate mem for information struct */
	if (!(cs = kmalloc(sizeof(struct call_struc), GFP_ATOMIC)))
		return (-ENOMEM); /* no memory */
	setup_timer(&cs->timer, deflect_timer_expire, (ulong)cs);
	cs->info[0] = '\0';
	cs->ics.driver = drvid;
	cs->ics.command = ISDN_CMD_PROT_IO; /* protocol specific io */
	cs->ics.arg = DSS1_CMD_INVOKE; /* invoke supplementary service */
	cs->ics.parm.dss1_io.proc = (mode == 1) ? 7 : (mode == 2) ? 11 : 8; /* operation */
	cs->ics.parm.dss1_io.timeout = 4000; /* from ETS 300 207-1 */
	cs->ics.parm.dss1_io.datalen = p - tmp; /* total len */
	cs->ics.parm.dss1_io.data = tmp; /* start of buffer */

	spin_lock_irqsave(&divert_lock, flags);
	cs->ics.parm.dss1_io.ll_id = next_id++; /* id for callback */
	spin_unlock_irqrestore(&divert_lock, flags);
	*procid = cs->ics.parm.dss1_io.ll_id;

	sprintf(cs->info, "%d 0x%lx %s%s 0 %s %02x %d%s%s\n",
		(!mode) ? DIVERT_DEACTIVATE : (mode == 1) ? DIVERT_ACTIVATE : DIVERT_REPORT,
		cs->ics.parm.dss1_io.ll_id,
		(mode != 2) ? "" : "0 ",
		divert_if.drv_to_name(cs->ics.driver),
		msn,
		service & 0xFF,
		proc,
		(mode != 1) ? "" : " 0 ",
		(mode != 1) ? "" : fwd_nr);

	retval = divert_if.ll_cmd(&cs->ics); /* execute command */

	if (!retval) {
		cs->prev = NULL;
		spin_lock_irqsave(&divert_lock, flags);
		cs->next = divert_head;
		divert_head = cs;
		spin_unlock_irqrestore(&divert_lock, flags);
	} else
		kfree(cs);
	return (retval);
} /* cf_command */


/****************************************/
/* handle a external deflection command */
/****************************************/
int deflect_extern_action(u_char cmd, ulong callid, char *to_nr)
{
	struct call_struc *cs;
	isdn_ctrl ic;
	unsigned long flags;
	int i;

	if ((cmd & 0x7F) > 2) return (-EINVAL); /* invalid command */
	cs = divert_head; /* start of parameter list */
	while (cs) {
		if (cs->divert_id == callid) break; /* found */
		cs = cs->next;
	} /* search entry */
	if (!cs) return (-EINVAL); /* invalid callid */

	ic.driver = cs->ics.driver;
	ic.arg = cs->ics.arg;
	i = -EINVAL;
	if (cs->akt_state == DEFLECT_AUTODEL) return (i); /* no valid call */
	switch (cmd & 0x7F) {
	case 0: /* hangup */
		del_timer(&cs->timer);
		ic.command = ISDN_CMD_HANGUP;
		i = divert_if.ll_cmd(&ic);
		spin_lock_irqsave(&divert_lock, flags);
		cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
		cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
		add_timer(&cs->timer);
		spin_unlock_irqrestore(&divert_lock, flags);
		break;

	case 1: /* alert */
		if (cs->akt_state == DEFLECT_ALERT) return (0);
		cmd &= 0x7F; /* never wait */
		del_timer(&cs->timer);
		ic.command = ISDN_CMD_ALERT;
		if ((i = divert_if.ll_cmd(&ic))) {
			spin_lock_irqsave(&divert_lock, flags);
			cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
			cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
			add_timer(&cs->timer);
			spin_unlock_irqrestore(&divert_lock, flags);
		} else
			cs->akt_state = DEFLECT_ALERT;
		break;

	case 2: /* redir */
		del_timer(&cs->timer);
		strlcpy(cs->ics.parm.setup.phone, to_nr, sizeof(cs->ics.parm.setup.phone));
		strcpy(cs->ics.parm.setup.eazmsn, "Testtext manual");
		ic.command = ISDN_CMD_REDIR;
		if ((i = divert_if.ll_cmd(&ic))) {
			spin_lock_irqsave(&divert_lock, flags);
			cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
			cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
			add_timer(&cs->timer);
			spin_unlock_irqrestore(&divert_lock, flags);
		} else
			cs->akt_state = DEFLECT_ALERT;
		break;

	} /* switch */
	return (i);
} /* deflect_extern_action */

/********************************/
/* insert a new rule before idx */
/********************************/
int insertrule(int idx, divert_rule *newrule)
{
	struct deflect_struc *ds, *ds1 = NULL;
	unsigned long flags;

	if (!(ds = kmalloc(sizeof(struct deflect_struc), GFP_KERNEL)))
		return (-ENOMEM); /* no memory */

	ds->rule = *newrule; /* set rule */

	spin_lock_irqsave(&divert_lock, flags);

	if (idx >= 0) {
		ds1 = table_head;
		while ((ds1) && (idx > 0))
		{ idx--;
			ds1 = ds1->next;
		}
		if (!ds1) idx = -1;
	}

	if (idx < 0) {
		ds->prev = table_tail; /* previous entry */
		ds->next = NULL; /* end of chain */
		if (ds->prev)
			ds->prev->next = ds; /* last forward */
		else
			table_head = ds; /* is first entry */
		table_tail = ds; /* end of queue */
	} else {
		ds->next = ds1; /* next entry */
		ds->prev = ds1->prev; /* prev entry */
		ds1->prev = ds; /* backward chain old element */
		if (!ds->prev)
			table_head = ds; /* first element */
	}

	spin_unlock_irqrestore(&divert_lock, flags);
	return (0);
} /* insertrule */

/***********************************/
/* delete the rule at position idx */
/***********************************/
int deleterule(int idx)
{
	struct deflect_struc *ds, *ds1;
	unsigned long flags;

	if (idx < 0) {
		spin_lock_irqsave(&divert_lock, flags);
		ds = table_head;
		table_head = NULL;
		table_tail = NULL;
		spin_unlock_irqrestore(&divert_lock, flags);
		while (ds) {
			ds1 = ds;
			ds = ds->next;
			kfree(ds1);
		}
		return (0);
	}

	spin_lock_irqsave(&divert_lock, flags);
	ds = table_head;

	while ((ds) && (idx > 0)) {
		idx--;
		ds = ds->next;
	}

	if (!ds) {
		spin_unlock_irqrestore(&divert_lock, flags);
		return (-EINVAL);
	}

	if (ds->next)
		ds->next->prev = ds->prev; /* backward chain */
	else
		table_tail = ds->prev; /* end of chain */

	if (ds->prev)
		ds->prev->next = ds->next; /* forward chain */
	else
		table_head = ds->next; /* start of chain */

	spin_unlock_irqrestore(&divert_lock, flags);
	kfree(ds);
	return (0);
} /* deleterule */

/*******************************************/
/* get a pointer to a specific rule number */
/*******************************************/
divert_rule *getruleptr(int idx)
{
	struct deflect_struc *ds = table_head;

	if (idx < 0) return (NULL);
	while ((ds) && (idx >= 0)) {
		if (!(idx--)) {
			return (&ds->rule);
			break;
		}
		ds = ds->next;
	}
	return (NULL);
} /* getruleptr */

/*************************************************/
/* called from common module on an incoming call */
/*************************************************/
static int isdn_divert_icall(isdn_ctrl *ic)
{
	int retval = 0;
	unsigned long flags;
	struct call_struc *cs = NULL;
	struct deflect_struc *dv;
	char *p, *p1;
	u_char accept;

	/* first check the internal deflection table */
	for (dv = table_head; dv; dv = dv->next) {
		/* scan table */
		if (((dv->rule.callopt == 1) && (ic->command == ISDN_STAT_ICALLW)) ||
		    ((dv->rule.callopt == 2) && (ic->command == ISDN_STAT_ICALL)))
			continue; /* call option check */
		if (!(dv->rule.drvid & (1L << ic->driver)))
			continue; /* driver not matching */
		if ((dv->rule.si1) && (dv->rule.si1 != ic->parm.setup.si1))
			continue; /* si1 not matching */
		if ((dv->rule.si2) && (dv->rule.si2 != ic->parm.setup.si2))
			continue; /* si2 not matching */

		p = dv->rule.my_msn;
		p1 = ic->parm.setup.eazmsn;
		accept = 0;
		while (*p) {
			/* complete compare */
			if (*p == '-') {
				accept = 1; /* call accepted */
				break;
			}
			if (*p++ != *p1++)
				break; /* not accepted */
			if ((!*p) && (!*p1))
				accept = 1;
		} /* complete compare */
		if (!accept) continue; /* not accepted */

		if ((strcmp(dv->rule.caller, "0")) ||
		    (ic->parm.setup.phone[0])) {
			p = dv->rule.caller;
			p1 = ic->parm.setup.phone;
			accept = 0;
			while (*p) {
				/* complete compare */
				if (*p == '-') {
					accept = 1; /* call accepted */
					break;
				}
				if (*p++ != *p1++)
					break; /* not accepted */
				if ((!*p) && (!*p1))
					accept = 1;
			} /* complete compare */
			if (!accept) continue; /* not accepted */
		}

		switch (dv->rule.action) {
		case DEFLECT_IGNORE:
			return 0;

		case DEFLECT_ALERT:
		case DEFLECT_PROCEED:
		case DEFLECT_REPORT:
		case DEFLECT_REJECT:
			if (dv->rule.action == DEFLECT_PROCEED)
				if ((!if_used) || ((!extern_wait_max) && (!dv->rule.waittime)))
					return (0); /* no external deflection needed */
			if (!(cs = kmalloc(sizeof(struct call_struc), GFP_ATOMIC)))
				return (0); /* no memory */
			setup_timer(&cs->timer, deflect_timer_expire,
				    (ulong)cs);
			cs->info[0] = '\0';

			cs->ics = *ic; /* copy incoming data */
			if (!cs->ics.parm.setup.phone[0]) strcpy(cs->ics.parm.setup.phone, "0");
			if (!cs->ics.parm.setup.eazmsn[0]) strcpy(cs->ics.parm.setup.eazmsn, "0");
			cs->ics.parm.setup.screen = dv->rule.screen;
			if (dv->rule.waittime)
				cs->timer.expires = jiffies + (HZ * dv->rule.waittime);
			else if (dv->rule.action == DEFLECT_PROCEED)
				cs->timer.expires = jiffies + (HZ * extern_wait_max);
			else
				cs->timer.expires = 0;
			cs->akt_state = dv->rule.action;
			spin_lock_irqsave(&divert_lock, flags);
			cs->divert_id = next_id++; /* new sequence number */
			spin_unlock_irqrestore(&divert_lock, flags);
			cs->prev = NULL;
			if (cs->akt_state == DEFLECT_ALERT) {
				strcpy(cs->deflect_dest, dv->rule.to_nr);
				if (!cs->timer.expires) {
					strcpy(ic->parm.setup.eazmsn,
					       "Testtext direct");
					ic->parm.setup.screen = dv->rule.screen;
					strlcpy(ic->parm.setup.phone, dv->rule.to_nr, sizeof(ic->parm.setup.phone));
					cs->akt_state = DEFLECT_AUTODEL; /* delete after timeout */
					cs->timer.expires = jiffies + (HZ * AUTODEL_TIME);
					retval = 5;
				} else
					retval = 1; /* alerting */
			} else {
				cs->deflect_dest[0] = '\0';
				retval = 4; /* only proceed */
			}
			snprintf(cs->info, sizeof(cs->info),
				 "%d 0x%lx %s %s %s %s 0x%x 0x%x %d %d %s\n",
				 cs->akt_state,
				 cs->divert_id,
				 divert_if.drv_to_name(cs->ics.driver),
				 (ic->command == ISDN_STAT_ICALLW) ? "1" : "0",
				 cs->ics.parm.setup.phone,
				 cs->ics.parm.setup.eazmsn,
				 cs->ics.parm.setup.si1,
				 cs->ics.parm.setup.si2,
				 cs->ics.parm.setup.screen,
				 dv->rule.waittime,
				 cs->deflect_dest);
			if ((dv->rule.action == DEFLECT_REPORT) ||
			    (dv->rule.action == DEFLECT_REJECT)) {
				put_info_buffer(cs->info);
				kfree(cs); /* remove */
				return ((dv->rule.action == DEFLECT_REPORT) ? 0 : 2); /* nothing to do */
			}
			break;

		default:
			return 0; /* ignore call */
		} /* switch action */
		break; /* will break the 'for' looping */
	} /* scan_table */

	if (cs) {
		cs->prev = NULL;
		spin_lock_irqsave(&divert_lock, flags);
		cs->next = divert_head;
		divert_head = cs;
		if (cs->timer.expires) add_timer(&cs->timer);
		spin_unlock_irqrestore(&divert_lock, flags);

		put_info_buffer(cs->info);
		return (retval);
	} else
		return (0);
} /* isdn_divert_icall */


void deleteprocs(void)
{
	struct call_struc *cs, *cs1;
	unsigned long flags;

	spin_lock_irqsave(&divert_lock, flags);
	cs = divert_head;
	divert_head = NULL;
	while (cs) {
		del_timer(&cs->timer);
		cs1 = cs;
		cs = cs->next;
		kfree(cs1);
	}
	spin_unlock_irqrestore(&divert_lock, flags);
} /* deleteprocs */

/****************************************************/
/* put a address including address type into buffer */
/****************************************************/
static int put_address(char *st, u_char *p, int len)
{
	u_char retval = 0;
	u_char adr_typ = 0; /* network standard */

	if (len < 2) return (retval);
	if (*p == 0xA1) {
		retval = *(++p) + 2; /* total length */
		if (retval > len) return (0); /* too short */
		len = retval - 2; /* remaining length */
		if (len < 3) return (0);
		if ((*(++p) != 0x0A) || (*(++p) != 1)) return (0);
		adr_typ = *(++p);
		len -= 3;
		p++;
		if (len < 2) return (0);
		if (*p++ != 0x12) return (0);
		if (*p > len) return (0); /* check number length */
		len = *p++;
	} else if (*p == 0x80) {
		retval = *(++p) + 2; /* total length */
		if (retval > len) return (0);
		len = retval - 2;
		p++;
	} else
		return (0); /* invalid address information */

	sprintf(st, "%d ", adr_typ);
	st += strlen(st);
	if (!len)
		*st++ = '-';
	else
		while (len--)
			*st++ = *p++;
	*st = '\0';
	return (retval);
} /* put_address */

/*************************************/
/* report a successful interrogation */
/*************************************/
static int interrogate_success(isdn_ctrl *ic, struct call_struc *cs)
{
	char *src = ic->parm.dss1_io.data;
	int restlen = ic->parm.dss1_io.datalen;
	int cnt = 1;
	u_char n, n1;
	char st[90], *p, *stp;

	if (restlen < 2) return (-100); /* frame too short */
	if (*src++ != 0x30) return (-101);
	if ((n = *src++) > 0x81) return (-102); /* invalid length field */
	restlen -= 2; /* remaining bytes */
	if (n == 0x80) {
		if (restlen < 2) return (-103);
		if ((*(src + restlen - 1)) || (*(src + restlen - 2))) return (-104);
		restlen -= 2;
	} else if (n == 0x81) {
		n = *src++;
		restlen--;
		if (n > restlen) return (-105);
		restlen = n;
	} else if (n > restlen)
		return (-106);
	else
		restlen = n; /* standard format */
	if (restlen < 3) return (-107); /* no procedure */
	if ((*src++ != 2) || (*src++ != 1) || (*src++ != 0x0B)) return (-108);
	restlen -= 3;
	if (restlen < 2) return (-109); /* list missing */
	if (*src == 0x31) {
		src++;
		if ((n = *src++) > 0x81) return (-110); /* invalid length field */
		restlen -= 2; /* remaining bytes */
		if (n == 0x80) {
			if (restlen < 2) return (-111);
			if ((*(src + restlen - 1)) || (*(src + restlen - 2))) return (-112);
			restlen -= 2;
		} else if (n == 0x81) {
			n = *src++;
			restlen--;
			if (n > restlen) return (-113);
			restlen = n;
		} else if (n > restlen)
			return (-114);
		else
			restlen = n; /* standard format */
	} /* result list header */

	while (restlen >= 2) {
		stp = st;
		sprintf(stp, "%d 0x%lx %d %s ", DIVERT_REPORT, ic->parm.dss1_io.ll_id,
			cnt++, divert_if.drv_to_name(ic->driver));
		stp += strlen(stp);
		if (*src++ != 0x30) return (-115); /* invalid enum */
		n = *src++;
		restlen -= 2;
		if (n > restlen) return (-116); /* enum length wrong */
		restlen -= n;
		p = src; /* one entry */
		src += n;
		if (!(n1 = put_address(stp, p, n & 0xFF))) continue;
		stp += strlen(stp);
		p += n1;
		n -= n1;
		if (n < 6) continue; /* no service and proc */
		if ((*p++ != 0x0A) || (*p++ != 1)) continue;
		sprintf(stp, " 0x%02x ", (*p++) & 0xFF);
		stp += strlen(stp);
		if ((*p++ != 0x0A) || (*p++ != 1)) continue;
		sprintf(stp, "%d ", (*p++) & 0xFF);
		stp += strlen(stp);
		n -= 6;
		if (n > 2) {
			if (*p++ != 0x30) continue;
			if (*p > (n - 2)) continue;
			n = *p++;
			if (!(n1 = put_address(stp, p, n & 0xFF))) continue;
			stp += strlen(stp);
		}
		sprintf(stp, "\n");
		put_info_buffer(st);
	} /* while restlen */
	if (restlen) return (-117);
	return (0);
} /* interrogate_success */

/*********************************************/
/* callback for protocol specific extensions */
/*********************************************/
static int prot_stat_callback(isdn_ctrl *ic)
{
	struct call_struc *cs, *cs1;
	int i;
	unsigned long flags;

	cs = divert_head; /* start of list */
	cs1 = NULL;
	while (cs) {
		if (ic->driver == cs->ics.driver) {
			switch (cs->ics.arg) {
			case DSS1_CMD_INVOKE:
				if ((cs->ics.parm.dss1_io.ll_id == ic->parm.dss1_io.ll_id) &&
				    (cs->ics.parm.dss1_io.hl_id == ic->parm.dss1_io.hl_id)) {
					switch (ic->arg) {
					case DSS1_STAT_INVOKE_ERR:
						sprintf(cs->info, "128 0x%lx 0x%x\n",
							ic->parm.dss1_io.ll_id,
							ic->parm.dss1_io.timeout);
						put_info_buffer(cs->info);
						break;

					case DSS1_STAT_INVOKE_RES:
						switch (cs->ics.parm.dss1_io.proc) {
						case  7:
						case  8:
							put_info_buffer(cs->info);
							break;

						case  11:
							i = interrogate_success(ic, cs);
							if (i)
								sprintf(cs->info, "%d 0x%lx %d\n", DIVERT_REPORT,
									ic->parm.dss1_io.ll_id, i);
							put_info_buffer(cs->info);
							break;

						default:
							printk(KERN_WARNING "dss1_divert: unknown proc %d\n", cs->ics.parm.dss1_io.proc);
							break;
						}

						break;

					default:
						printk(KERN_WARNING "dss1_divert unknown invoke answer %lx\n", ic->arg);
						break;
					}
					cs1 = cs; /* remember structure */
					cs = NULL;
					continue; /* abort search */
				} /* id found */
				break;

			case DSS1_CMD_INVOKE_ABORT:
				printk(KERN_WARNING "dss1_divert unhandled invoke abort\n");
				break;

			default:
				printk(KERN_WARNING "dss1_divert unknown cmd 0x%lx\n", cs->ics.arg);
				break;
			} /* switch ics.arg */
			cs = cs->next;
		} /* driver ok */
	}

	if (!cs1) {
		printk(KERN_WARNING "dss1_divert unhandled process\n");
		return (0);
	}

	if (cs1->ics.driver == -1) {
		spin_lock_irqsave(&divert_lock, flags);
		del_timer(&cs1->timer);
		if (cs1->prev)
			cs1->prev->next = cs1->next; /* forward link */
		else
			divert_head = cs1->next;
		if (cs1->next)
			cs1->next->prev = cs1->prev; /* back link */
		spin_unlock_irqrestore(&divert_lock, flags);
		kfree(cs1);
	}

	return (0);
} /* prot_stat_callback */


/***************************/
/* status callback from HL */
/***************************/
static int isdn_divert_stat_callback(isdn_ctrl *ic)
{
	struct call_struc *cs, *cs1;
	unsigned long flags;
	int retval;

	retval = -1;
	cs = divert_head; /* start of list */
	while (cs) {
		if ((ic->driver == cs->ics.driver) &&
		    (ic->arg == cs->ics.arg)) {
			switch (ic->command) {
			case ISDN_STAT_DHUP:
				sprintf(cs->info, "129 0x%lx\n", cs->divert_id);
				del_timer(&cs->timer);
				cs->ics.driver = -1;
				break;

			case ISDN_STAT_CAUSE:
				sprintf(cs->info, "130 0x%lx %s\n", cs->divert_id, ic->parm.num);
				break;

			case ISDN_STAT_REDIR:
				sprintf(cs->info, "131 0x%lx\n", cs->divert_id);
				del_timer(&cs->timer);
				cs->ics.driver = -1;
				break;

			default:
				sprintf(cs->info, "999 0x%lx 0x%x\n", cs->divert_id, (int)(ic->command));
				break;
			}
			put_info_buffer(cs->info);
			retval = 0;
		}
		cs1 = cs;
		cs = cs->next;
		if (cs1->ics.driver == -1) {
			spin_lock_irqsave(&divert_lock, flags);
			if (cs1->prev)
				cs1->prev->next = cs1->next; /* forward link */
			else
				divert_head = cs1->next;
			if (cs1->next)
				cs1->next->prev = cs1->prev; /* back link */
			spin_unlock_irqrestore(&divert_lock, flags);
			kfree(cs1);
		}
	}
	return (retval); /* not found */
} /* isdn_divert_stat_callback */


/********************/
/* callback from ll */
/********************/
int ll_callback(isdn_ctrl *ic)
{
	switch (ic->command) {
	case ISDN_STAT_ICALL:
	case ISDN_STAT_ICALLW:
		return (isdn_divert_icall(ic));
		break;

	case ISDN_STAT_PROT:
		if ((ic->arg & 0xFF) == ISDN_PTYPE_EURO) {
			if (ic->arg != DSS1_STAT_INVOKE_BRD)
				return (prot_stat_callback(ic));
			else
				return (0); /* DSS1 invoke broadcast */
		} else
			return (-1); /* protocol not euro */

	default:
		return (isdn_divert_stat_callback(ic));
	}
} /* ll_callback */