isdnl3.c revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac 
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#include <linux/config.h>
22
23const char *l3_revision = "$Revision: 2.22.2.3 $";
24
25static struct Fsm l3fsm;
26
27enum {
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
37static 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
46enum {
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
58static 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
69static void
70l3m_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
80u_char *
81findie(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
125int
126getcallref(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
140static int OrigCallRef = 0;
141
142int
143newcallref(void)
144{
145	if (OrigCallRef == 127)
146		OrigCallRef = 1;
147	else
148		OrigCallRef++;
149	return (OrigCallRef);
150}
151
152void
153newl3state(struct l3_process *pc, int state)
154{
155	if (pc->debug & L3_DEB_STATE)
156		l3_debug(pc->st, "newstate cr %d %d --> %d",
157			 pc->callref & 0x7F,
158			 pc->state, state);
159	pc->state = state;
160}
161
162static void
163L3ExpireTimer(struct L3Timer *t)
164{
165	t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc);
166}
167
168void
169L3InitTimer(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
177void
178L3DelTimer(struct L3Timer *t)
179{
180	del_timer(&t->tl);
181}
182
183int
184L3AddTimer(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
198void
199StopAllL3Timer(struct l3_process *pc)
200{
201	L3DelTimer(&pc->timer);
202}
203
204struct sk_buff *
205l3_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
217static void
218no_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
228static int
229no_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#ifdef	CONFIG_HISAX_EURO
236extern void setstack_dss1(struct PStack *st);
237#endif
238
239#ifdef  CONFIG_HISAX_NI1
240extern void setstack_ni1(struct PStack *st);
241#endif
242
243#ifdef	CONFIG_HISAX_1TR6
244extern void setstack_1tr6(struct PStack *st);
245#endif
246
247struct l3_process
248*getl3proc(struct PStack *st, int cr)
249{
250	struct l3_process *p = st->l3.proc;
251
252	while (p)
253		if (p->callref == cr)
254			return (p);
255		else
256			p = p->next;
257	return (NULL);
258}
259
260struct l3_process
261*new_l3_process(struct PStack *st, int cr)
262{
263	struct l3_process *p, *np;
264
265	if (!(p = kmalloc(sizeof(struct l3_process), GFP_ATOMIC))) {
266		printk(KERN_ERR "HiSax can't get memory for cr %d\n", cr);
267		return (NULL);
268	}
269	if (!st->l3.proc)
270		st->l3.proc = p;
271	else {
272		np = st->l3.proc;
273		while (np->next)
274			np = np->next;
275		np->next = p;
276	}
277	p->next = NULL;
278	p->debug = st->l3.debug;
279	p->callref = cr;
280	p->state = 0;
281	p->chan = NULL;
282	p->st = st;
283	p->N303 = st->l3.N303;
284	L3InitTimer(p, &p->timer);
285	return (p);
286};
287
288void
289release_l3_process(struct l3_process *p)
290{
291	struct l3_process *np, *pp = NULL;
292
293	if (!p)
294		return;
295	np = p->st->l3.proc;
296	while (np) {
297		if (np == p) {
298			StopAllL3Timer(p);
299			if (pp)
300				pp->next = np->next;
301			else if (!(p->st->l3.proc = np->next) &&
302				!test_bit(FLG_PTP, &p->st->l2.flag)) {
303				if (p->debug)
304					l3_debug(p->st, "release_l3_process: last process");
305				if (!skb_queue_len(&p->st->l3.squeue)) {
306					if (p->debug)
307						l3_debug(p->st, "release_l3_process: release link");
308					if (p->st->protocol != ISDN_PTYPE_NI1)
309						FsmEvent(&p->st->l3.l3m, EV_RELEASE_REQ, NULL);
310					else
311						FsmEvent(&p->st->l3.l3m, EV_RELEASE_IND, NULL);
312				} else {
313					if (p->debug)
314						l3_debug(p->st, "release_l3_process: not release link");
315				}
316			}
317			kfree(p);
318			return;
319		}
320		pp = np;
321		np = np->next;
322	}
323	printk(KERN_ERR "HiSax internal L3 error CR(%d) not in list\n", p->callref);
324	l3_debug(p->st, "HiSax internal L3 error CR(%d) not in list", p->callref);
325};
326
327static void
328l3ml3p(struct PStack *st, int pr)
329{
330	struct l3_process *p = st->l3.proc;
331	struct l3_process *np;
332
333	while (p) {
334		/* p might be kfreed under us, so we need to save where we want to go on */
335		np = p->next;
336		st->l3.l3ml3(st, pr, p);
337		p = np;
338	}
339}
340
341void
342setstack_l3dc(struct PStack *st, struct Channel *chanp)
343{
344	char tmp[64];
345
346	st->l3.proc   = NULL;
347	st->l3.global = NULL;
348	skb_queue_head_init(&st->l3.squeue);
349	st->l3.l3m.fsm = &l3fsm;
350	st->l3.l3m.state = ST_L3_LC_REL;
351	st->l3.l3m.debug = 1;
352	st->l3.l3m.userdata = st;
353	st->l3.l3m.userint = 0;
354	st->l3.l3m.printdebug = l3m_debug;
355        FsmInitTimer(&st->l3.l3m, &st->l3.l3m_timer);
356	strcpy(st->l3.debug_id, "L3DC ");
357	st->lli.l4l3_proto = no_l3_proto_spec;
358
359#ifdef	CONFIG_HISAX_EURO
360	if (st->protocol == ISDN_PTYPE_EURO) {
361		setstack_dss1(st);
362	} else
363#endif
364#ifdef  CONFIG_HISAX_NI1
365	if (st->protocol == ISDN_PTYPE_NI1) {
366		setstack_ni1(st);
367	} else
368#endif
369#ifdef	CONFIG_HISAX_1TR6
370	if (st->protocol == ISDN_PTYPE_1TR6) {
371		setstack_1tr6(st);
372	} else
373#endif
374	if (st->protocol == ISDN_PTYPE_LEASED) {
375		st->lli.l4l3 = no_l3_proto;
376		st->l2.l2l3 = no_l3_proto;
377                st->l3.l3ml3 = no_l3_proto;
378		printk(KERN_INFO "HiSax: Leased line mode\n");
379	} else {
380		st->lli.l4l3 = no_l3_proto;
381		st->l2.l2l3 = no_l3_proto;
382                st->l3.l3ml3 = no_l3_proto;
383		sprintf(tmp, "protocol %s not supported",
384			(st->protocol == ISDN_PTYPE_1TR6) ? "1tr6" :
385			(st->protocol == ISDN_PTYPE_EURO) ? "euro" :
386			(st->protocol == ISDN_PTYPE_NI1) ? "ni1" :
387			"unknown");
388		printk(KERN_WARNING "HiSax: %s\n", tmp);
389		st->protocol = -1;
390	}
391}
392
393void
394isdnl3_trans(struct PStack *st, int pr, void *arg) {
395	st->l3.l3l2(st, pr, arg);
396}
397
398void
399releasestack_isdnl3(struct PStack *st)
400{
401	while (st->l3.proc)
402		release_l3_process(st->l3.proc);
403	if (st->l3.global) {
404		StopAllL3Timer(st->l3.global);
405		kfree(st->l3.global);
406		st->l3.global = NULL;
407	}
408	FsmDelTimer(&st->l3.l3m_timer, 54);
409	skb_queue_purge(&st->l3.squeue);
410}
411
412void
413setstack_l3bc(struct PStack *st, struct Channel *chanp)
414{
415
416	st->l3.proc   = NULL;
417	st->l3.global = NULL;
418	skb_queue_head_init(&st->l3.squeue);
419	st->l3.l3m.fsm = &l3fsm;
420	st->l3.l3m.state = ST_L3_LC_REL;
421	st->l3.l3m.debug = 1;
422	st->l3.l3m.userdata = st;
423	st->l3.l3m.userint = 0;
424	st->l3.l3m.printdebug = l3m_debug;
425	strcpy(st->l3.debug_id, "L3BC ");
426	st->lli.l4l3 = isdnl3_trans;
427}
428
429#define DREL_TIMER_VALUE 40000
430
431static void
432lc_activate(struct FsmInst *fi, int event, void *arg)
433{
434	struct PStack *st = fi->userdata;
435
436	FsmChangeState(fi, ST_L3_LC_ESTAB_WAIT);
437	st->l3.l3l2(st, DL_ESTABLISH | REQUEST, NULL);
438}
439
440static void
441lc_connect(struct FsmInst *fi, int event, void *arg)
442{
443	struct PStack *st = fi->userdata;
444	struct sk_buff *skb = arg;
445	int dequeued = 0;
446
447	FsmChangeState(fi, ST_L3_LC_ESTAB);
448	while ((skb = skb_dequeue(&st->l3.squeue))) {
449		st->l3.l3l2(st, DL_DATA | REQUEST, skb);
450		dequeued++;
451	}
452	if ((!st->l3.proc) &&  dequeued) {
453		if (st->l3.debug)
454			l3_debug(st, "lc_connect: release link");
455		FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
456	} else
457		l3ml3p(st, DL_ESTABLISH | INDICATION);
458}
459
460static void
461lc_connected(struct FsmInst *fi, int event, void *arg)
462{
463	struct PStack *st = fi->userdata;
464	struct sk_buff *skb = arg;
465	int dequeued = 0;
466
467	FsmDelTimer(&st->l3.l3m_timer, 51);
468	FsmChangeState(fi, ST_L3_LC_ESTAB);
469	while ((skb = skb_dequeue(&st->l3.squeue))) {
470		st->l3.l3l2(st, DL_DATA | REQUEST, skb);
471		dequeued++;
472	}
473	if ((!st->l3.proc) &&  dequeued) {
474		if (st->l3.debug)
475			l3_debug(st, "lc_connected: release link");
476		FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
477	} else
478		l3ml3p(st, DL_ESTABLISH | CONFIRM);
479}
480
481static void
482lc_start_delay(struct FsmInst *fi, int event, void *arg)
483{
484       struct PStack *st = fi->userdata;
485
486       FsmChangeState(fi, ST_L3_LC_REL_DELAY);
487       FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
488}
489
490static void
491lc_start_delay_check(struct FsmInst *fi, int event, void *arg)
492/* 20/09/00 - GE timer not user for NI-1 as layer 2 should stay up */
493{
494       struct PStack *st = fi->userdata;
495
496       FsmChangeState(fi, ST_L3_LC_REL_DELAY);
497       /* 19/09/00 - GE timer not user for NI-1 */
498       if (st->protocol != ISDN_PTYPE_NI1)
499       		FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
500}
501
502static void
503lc_release_req(struct FsmInst *fi, int event, void *arg)
504{
505	struct PStack *st = fi->userdata;
506
507	if (test_bit(FLG_L2BLOCK, &st->l2.flag)) {
508		if (st->l3.debug)
509			l3_debug(st, "lc_release_req: l2 blocked");
510		/* restart release timer */
511		FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 51);
512	} else {
513		FsmChangeState(fi, ST_L3_LC_REL_WAIT);
514		st->l3.l3l2(st, DL_RELEASE | REQUEST, NULL);
515	}
516}
517
518static void
519lc_release_ind(struct FsmInst *fi, int event, void *arg)
520{
521	struct PStack *st = fi->userdata;
522
523	FsmDelTimer(&st->l3.l3m_timer, 52);
524	FsmChangeState(fi, ST_L3_LC_REL);
525	skb_queue_purge(&st->l3.squeue);
526	l3ml3p(st, DL_RELEASE | INDICATION);
527}
528
529static void
530lc_release_cnf(struct FsmInst *fi, int event, void *arg)
531{
532	struct PStack *st = fi->userdata;
533
534	FsmChangeState(fi, ST_L3_LC_REL);
535	skb_queue_purge(&st->l3.squeue);
536	l3ml3p(st, DL_RELEASE | CONFIRM);
537}
538
539
540/* *INDENT-OFF* */
541static struct FsmNode L3FnList[] __initdata =
542{
543	{ST_L3_LC_REL,		EV_ESTABLISH_REQ,	lc_activate},
544	{ST_L3_LC_REL,		EV_ESTABLISH_IND,	lc_connect},
545	{ST_L3_LC_REL,		EV_ESTABLISH_CNF,	lc_connect},
546	{ST_L3_LC_ESTAB_WAIT,	EV_ESTABLISH_CNF,	lc_connected},
547	{ST_L3_LC_ESTAB_WAIT,	EV_RELEASE_REQ,		lc_start_delay},
548	{ST_L3_LC_ESTAB_WAIT,	EV_RELEASE_IND,		lc_release_ind},
549	{ST_L3_LC_ESTAB,	EV_RELEASE_IND,		lc_release_ind},
550	{ST_L3_LC_ESTAB,	EV_RELEASE_REQ,		lc_start_delay_check},
551        {ST_L3_LC_REL_DELAY,    EV_RELEASE_IND,         lc_release_ind},
552        {ST_L3_LC_REL_DELAY,    EV_ESTABLISH_REQ,       lc_connected},
553        {ST_L3_LC_REL_DELAY,    EV_TIMEOUT,             lc_release_req},
554	{ST_L3_LC_REL_WAIT,	EV_RELEASE_CNF,		lc_release_cnf},
555	{ST_L3_LC_REL_WAIT,	EV_ESTABLISH_REQ,	lc_activate},
556};
557/* *INDENT-ON* */
558
559#define L3_FN_COUNT (sizeof(L3FnList)/sizeof(struct FsmNode))
560
561void
562l3_msg(struct PStack *st, int pr, void *arg)
563{
564	switch (pr) {
565		case (DL_DATA | REQUEST):
566			if (st->l3.l3m.state == ST_L3_LC_ESTAB) {
567				st->l3.l3l2(st, pr, arg);
568			} else {
569				struct sk_buff *skb = arg;
570
571				skb_queue_tail(&st->l3.squeue, skb);
572				FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL);
573			}
574			break;
575		case (DL_ESTABLISH | REQUEST):
576			FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL);
577			break;
578		case (DL_ESTABLISH | CONFIRM):
579			FsmEvent(&st->l3.l3m, EV_ESTABLISH_CNF, NULL);
580			break;
581		case (DL_ESTABLISH | INDICATION):
582			FsmEvent(&st->l3.l3m, EV_ESTABLISH_IND, NULL);
583			break;
584		case (DL_RELEASE | INDICATION):
585			FsmEvent(&st->l3.l3m, EV_RELEASE_IND, NULL);
586			break;
587		case (DL_RELEASE | CONFIRM):
588			FsmEvent(&st->l3.l3m, EV_RELEASE_CNF, NULL);
589			break;
590		case (DL_RELEASE | REQUEST):
591			FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
592			break;
593	}
594}
595
596int __init
597Isdnl3New(void)
598{
599	l3fsm.state_count = L3_STATE_COUNT;
600	l3fsm.event_count = L3_EVENT_COUNT;
601	l3fsm.strEvent = strL3Event;
602	l3fsm.strState = strL3State;
603	return FsmNew(&l3fsm, L3FnList, L3_FN_COUNT);
604}
605
606void
607Isdnl3Free(void)
608{
609	FsmFree(&l3fsm);
610}
611