[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / isdn / hisax / isdnl3.c

/* $Id: isdnl3.c,v 2.22.2.3 2004/01/13 14:31:25 keil Exp $
 *
 * Author       Karsten Keil
 *              based on the teles driver from Jan den Ouden
 * Copyright    by Karsten Keil      <keil@isdn4linux.de>
 * 
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * For changes and modifications please read
 * Documentation/isdn/HiSax.cert
 *
 * Thanks to    Jan den Ouden
 *              Fritz Elfert
 *
 */

#include <linux/init.h>
#include <linux/slab.h>
#include "hisax.h"
#include "isdnl3.h"

const char *l3_revision = "$Revision: 2.22.2.3 $";

static struct Fsm l3fsm;

enum {
	ST_L3_LC_REL,
	ST_L3_LC_ESTAB_WAIT,
	ST_L3_LC_REL_DELAY, 
	ST_L3_LC_REL_WAIT,
	ST_L3_LC_ESTAB,
};

#define L3_STATE_COUNT (ST_L3_LC_ESTAB+1)

static char *strL3State[] =
{
	"ST_L3_LC_REL",
	"ST_L3_LC_ESTAB_WAIT",
	"ST_L3_LC_REL_DELAY",
	"ST_L3_LC_REL_WAIT",
	"ST_L3_LC_ESTAB",
};

enum {
	EV_ESTABLISH_REQ,
	EV_ESTABLISH_IND,
	EV_ESTABLISH_CNF,
	EV_RELEASE_REQ,
	EV_RELEASE_CNF,
	EV_RELEASE_IND,
	EV_TIMEOUT,
};

#define L3_EVENT_COUNT (EV_TIMEOUT+1)

static char *strL3Event[] =
{
	"EV_ESTABLISH_REQ",
	"EV_ESTABLISH_IND",
	"EV_ESTABLISH_CNF",
	"EV_RELEASE_REQ",
	"EV_RELEASE_CNF",
	"EV_RELEASE_IND",
	"EV_TIMEOUT",
};

static void
l3m_debug(struct FsmInst *fi, char *fmt, ...)
{
	va_list args;
	struct PStack *st = fi->userdata;

	va_start(args, fmt);
	VHiSax_putstatus(st->l1.hardware, st->l3.debug_id, fmt, args);
	va_end(args);
}

u_char *
findie(u_char * p, int size, u_char ie, int wanted_set)
{
	int l, codeset, maincodeset;
	u_char *pend = p + size;

	/* skip protocol discriminator, callref and message type */
	p++;
	l = (*p++) & 0xf;
	p += l;
	p++;
	codeset = 0;
	maincodeset = 0;
	/* while there are bytes left... */
	while (p < pend) {
		if ((*p & 0xf0) == 0x90) {
			codeset = *p & 0x07;
			if (!(*p & 0x08))
				maincodeset = codeset;
		}
		if (*p & 0x80)
			p++;
		else {
			if (codeset == wanted_set) {
				if (*p == ie)
                                  { /* improved length check (Werner Cornelius) */
                                    if ((pend - p) < 2) 
                                      return(NULL); 
                                    if (*(p+1) > (pend - (p+2))) 
                                      return(NULL); 
                                    return (p);
                                  }           
                                  
				if (*p > ie)
					return (NULL);
			}
			p++;
			l = *p++;
			p += l;
			codeset = maincodeset;
		}
	}
	return (NULL);
}

int
getcallref(u_char * p)
{
	int l, cr = 0;

	p++;			/* prot discr */
	if (*p & 0xfe)		/* wrong callref BRI only 1 octet*/
		return(-2);
	l = 0xf & *p++;		/* callref length */
	if (!l)			/* dummy CallRef */
		return(-1);
	cr = *p++;
	return (cr);
}

static int OrigCallRef = 0;

int
newcallref(void)
{
	if (OrigCallRef == 127)
		OrigCallRef = 1;
	else
		OrigCallRef++;
	return (OrigCallRef);
}

void
newl3state(struct l3_process *pc, int state)
{
	if (pc->debug & L3_DEB_STATE)
		l3_debug(pc->st, "newstate cr %d %d --> %d", 
			 pc->callref & 0x7F,
			 pc->state, state);
	pc->state = state;
}

static void
L3ExpireTimer(struct L3Timer *t)
{
	t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc);
}

void
L3InitTimer(struct l3_process *pc, struct L3Timer *t)
{
	t->pc = pc;
	t->tl.function = (void *) L3ExpireTimer;
	t->tl.data = (long) t;
	init_timer(&t->tl);
}

void
L3DelTimer(struct L3Timer *t)
{
	del_timer(&t->tl);
}

int
L3AddTimer(struct L3Timer *t,
	   int millisec, int event)
{
	if (timer_pending(&t->tl)) {
		printk(KERN_WARNING "L3AddTimer: timer already active!\n");
		return -1;
	}
	init_timer(&t->tl);
	t->event = event;
	t->tl.expires = jiffies + (millisec * HZ) / 1000;
	add_timer(&t->tl);
	return 0;
}

void
StopAllL3Timer(struct l3_process *pc)
{
	L3DelTimer(&pc->timer);
}

struct sk_buff *
l3_alloc_skb(int len)
{
	struct sk_buff *skb;

	if (!(skb = alloc_skb(len + MAX_HEADER_LEN, GFP_ATOMIC))) {
		printk(KERN_WARNING "HiSax: No skb for D-channel\n");
		return (NULL);
	}
	skb_reserve(skb, MAX_HEADER_LEN);
	return (skb);
}

static void
no_l3_proto(struct PStack *st, int pr, void *arg)
{
	struct sk_buff *skb = arg;

	HiSax_putstatus(st->l1.hardware, "L3", "no D protocol");
	if (skb) {
		dev_kfree_skb(skb);
	}
}

static int
no_l3_proto_spec(struct PStack *st, isdn_ctrl *ic)
{
	printk(KERN_WARNING "HiSax: no specific protocol handler for proto %lu\n",ic->arg & 0xFF);
	return(-1);
}

struct l3_process
*getl3proc(struct PStack *st, int cr)
{
	struct l3_process *p = st->l3.proc;

	while (p)
		if (p->callref == cr)
			return (p);
		else
			p = p->next;
	return (NULL);
}

struct l3_process
*new_l3_process(struct PStack *st, int cr)
{
	struct l3_process *p, *np;

	if (!(p = kmalloc(sizeof(struct l3_process), GFP_ATOMIC))) {
		printk(KERN_ERR "HiSax can't get memory for cr %d\n", cr);
		return (NULL);
	}
	if (!st->l3.proc)
		st->l3.proc = p;
	else {
		np = st->l3.proc;
		while (np->next)
			np = np->next;
		np->next = p;
	}
	p->next = NULL;
	p->debug = st->l3.debug;
	p->callref = cr;
	p->state = 0;
	p->chan = NULL;
	p->st = st;
	p->N303 = st->l3.N303;
	L3InitTimer(p, &p->timer);
	return (p);
};

void
release_l3_process(struct l3_process *p)
{
	struct l3_process *np, *pp = NULL;

	if (!p)
		return;
	np = p->st->l3.proc;
	while (np) {
		if (np == p) {
			StopAllL3Timer(p);
			if (pp)
				pp->next = np->next;
			else if (!(p->st->l3.proc = np->next) &&
				!test_bit(FLG_PTP, &p->st->l2.flag)) {
				if (p->debug)
					l3_debug(p->st, "release_l3_process: last process");
				if (skb_queue_empty(&p->st->l3.squeue)) {
					if (p->debug)
						l3_debug(p->st, "release_l3_process: release link");
					if (p->st->protocol != ISDN_PTYPE_NI1)
						FsmEvent(&p->st->l3.l3m, EV_RELEASE_REQ, NULL);
					else
						FsmEvent(&p->st->l3.l3m, EV_RELEASE_IND, NULL);
				} else {
					if (p->debug)
						l3_debug(p->st, "release_l3_process: not release link");
				}
			} 
			kfree(p);
			return;
		}
		pp = np;
		np = np->next;
	}
	printk(KERN_ERR "HiSax internal L3 error CR(%d) not in list\n", p->callref);
	l3_debug(p->st, "HiSax internal L3 error CR(%d) not in list", p->callref);
};

static void
l3ml3p(struct PStack *st, int pr)
{
	struct l3_process *p = st->l3.proc;
	struct l3_process *np;

	while (p) {
		/* p might be kfreed under us, so we need to save where we want to go on */
		np = p->next;
		st->l3.l3ml3(st, pr, p);
		p = np;
	}
}

void
setstack_l3dc(struct PStack *st, struct Channel *chanp)
{
	char tmp[64];

	st->l3.proc   = NULL;
	st->l3.global = NULL;
	skb_queue_head_init(&st->l3.squeue);
	st->l3.l3m.fsm = &l3fsm;
	st->l3.l3m.state = ST_L3_LC_REL;
	st->l3.l3m.debug = 1;
	st->l3.l3m.userdata = st;
	st->l3.l3m.userint = 0;
	st->l3.l3m.printdebug = l3m_debug;
        FsmInitTimer(&st->l3.l3m, &st->l3.l3m_timer);
	strcpy(st->l3.debug_id, "L3DC ");
	st->lli.l4l3_proto = no_l3_proto_spec;

#ifdef	CONFIG_HISAX_EURO
	if (st->protocol == ISDN_PTYPE_EURO) {
		setstack_dss1(st);
	} else
#endif
#ifdef  CONFIG_HISAX_NI1
	if (st->protocol == ISDN_PTYPE_NI1) {
		setstack_ni1(st);
	} else
#endif
#ifdef	CONFIG_HISAX_1TR6
	if (st->protocol == ISDN_PTYPE_1TR6) {
		setstack_1tr6(st);
	} else
#endif
	if (st->protocol == ISDN_PTYPE_LEASED) {
		st->lli.l4l3 = no_l3_proto;
		st->l2.l2l3 = no_l3_proto;
                st->l3.l3ml3 = no_l3_proto;
		printk(KERN_INFO "HiSax: Leased line mode\n");
	} else {
		st->lli.l4l3 = no_l3_proto;
		st->l2.l2l3 = no_l3_proto;
                st->l3.l3ml3 = no_l3_proto;
		sprintf(tmp, "protocol %s not supported",
			(st->protocol == ISDN_PTYPE_1TR6) ? "1tr6" :
			(st->protocol == ISDN_PTYPE_EURO) ? "euro" :
			(st->protocol == ISDN_PTYPE_NI1) ? "ni1" :
			"unknown");
		printk(KERN_WARNING "HiSax: %s\n", tmp);
		st->protocol = -1;
	}
}

static void
isdnl3_trans(struct PStack *st, int pr, void *arg) {
	st->l3.l3l2(st, pr, arg);
}

void
releasestack_isdnl3(struct PStack *st)
{
	while (st->l3.proc)
		release_l3_process(st->l3.proc);
	if (st->l3.global) {
		StopAllL3Timer(st->l3.global);
		kfree(st->l3.global);
		st->l3.global = NULL;
	}
	FsmDelTimer(&st->l3.l3m_timer, 54);
	skb_queue_purge(&st->l3.squeue);
}

void
setstack_l3bc(struct PStack *st, struct Channel *chanp)
{

	st->l3.proc   = NULL;
	st->l3.global = NULL;
	skb_queue_head_init(&st->l3.squeue);
	st->l3.l3m.fsm = &l3fsm;
	st->l3.l3m.state = ST_L3_LC_REL;
	st->l3.l3m.debug = 1;
	st->l3.l3m.userdata = st;
	st->l3.l3m.userint = 0;
	st->l3.l3m.printdebug = l3m_debug;
	strcpy(st->l3.debug_id, "L3BC ");
	st->lli.l4l3 = isdnl3_trans;
}

#define DREL_TIMER_VALUE 40000

static void
lc_activate(struct FsmInst *fi, int event, void *arg)
{
	struct PStack *st = fi->userdata;

	FsmChangeState(fi, ST_L3_LC_ESTAB_WAIT);
	st->l3.l3l2(st, DL_ESTABLISH | REQUEST, NULL);
}

static void
lc_connect(struct FsmInst *fi, int event, void *arg)
{
	struct PStack *st = fi->userdata;
	struct sk_buff *skb = arg;
	int dequeued = 0;

	FsmChangeState(fi, ST_L3_LC_ESTAB);
	while ((skb = skb_dequeue(&st->l3.squeue))) {
		st->l3.l3l2(st, DL_DATA | REQUEST, skb);
		dequeued++;
	}
	if ((!st->l3.proc) &&  dequeued) {
		if (st->l3.debug)
			l3_debug(st, "lc_connect: release link");
		FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
	} else
		l3ml3p(st, DL_ESTABLISH | INDICATION);
}

static void
lc_connected(struct FsmInst *fi, int event, void *arg)
{
	struct PStack *st = fi->userdata;
	struct sk_buff *skb = arg;
	int dequeued = 0;

	FsmDelTimer(&st->l3.l3m_timer, 51);
	FsmChangeState(fi, ST_L3_LC_ESTAB);
	while ((skb = skb_dequeue(&st->l3.squeue))) {
		st->l3.l3l2(st, DL_DATA | REQUEST, skb);
		dequeued++;
	}
	if ((!st->l3.proc) &&  dequeued) {
		if (st->l3.debug)
			l3_debug(st, "lc_connected: release link");
		FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
	} else
		l3ml3p(st, DL_ESTABLISH | CONFIRM);
}

static void
lc_start_delay(struct FsmInst *fi, int event, void *arg)
{
       struct PStack *st = fi->userdata;

       FsmChangeState(fi, ST_L3_LC_REL_DELAY);
       FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
}

static void
lc_start_delay_check(struct FsmInst *fi, int event, void *arg)
/* 20/09/00 - GE timer not user for NI-1 as layer 2 should stay up */
{
       struct PStack *st = fi->userdata;

       FsmChangeState(fi, ST_L3_LC_REL_DELAY);
       /* 19/09/00 - GE timer not user for NI-1 */
       if (st->protocol != ISDN_PTYPE_NI1) 
       		FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
}

static void
lc_release_req(struct FsmInst *fi, int event, void *arg)
{
	struct PStack *st = fi->userdata;

	if (test_bit(FLG_L2BLOCK, &st->l2.flag)) {
		if (st->l3.debug)
			l3_debug(st, "lc_release_req: l2 blocked");
		/* restart release timer */
		FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 51);
	} else {
		FsmChangeState(fi, ST_L3_LC_REL_WAIT);
		st->l3.l3l2(st, DL_RELEASE | REQUEST, NULL);
	}
}

static void
lc_release_ind(struct FsmInst *fi, int event, void *arg)
{
	struct PStack *st = fi->userdata;

	FsmDelTimer(&st->l3.l3m_timer, 52);
	FsmChangeState(fi, ST_L3_LC_REL);
	skb_queue_purge(&st->l3.squeue);
	l3ml3p(st, DL_RELEASE | INDICATION);
}

static void
lc_release_cnf(struct FsmInst *fi, int event, void *arg)
{
	struct PStack *st = fi->userdata;

	FsmChangeState(fi, ST_L3_LC_REL);
	skb_queue_purge(&st->l3.squeue);
	l3ml3p(st, DL_RELEASE | CONFIRM);
}


/* *INDENT-OFF* */
static struct FsmNode L3FnList[] __initdata =
{
	{ST_L3_LC_REL,		EV_ESTABLISH_REQ,	lc_activate},
	{ST_L3_LC_REL,		EV_ESTABLISH_IND,	lc_connect},
	{ST_L3_LC_REL,		EV_ESTABLISH_CNF,	lc_connect},
	{ST_L3_LC_ESTAB_WAIT,	EV_ESTABLISH_CNF,	lc_connected},
	{ST_L3_LC_ESTAB_WAIT,	EV_RELEASE_REQ,		lc_start_delay},
	{ST_L3_LC_ESTAB_WAIT,	EV_RELEASE_IND,		lc_release_ind},
	{ST_L3_LC_ESTAB,	EV_RELEASE_IND,		lc_release_ind},
	{ST_L3_LC_ESTAB,	EV_RELEASE_REQ,		lc_start_delay_check},
        {ST_L3_LC_REL_DELAY,    EV_RELEASE_IND,         lc_release_ind},
        {ST_L3_LC_REL_DELAY,    EV_ESTABLISH_REQ,       lc_connected},
        {ST_L3_LC_REL_DELAY,    EV_TIMEOUT,             lc_release_req},
	{ST_L3_LC_REL_WAIT,	EV_RELEASE_CNF,		lc_release_cnf},
	{ST_L3_LC_REL_WAIT,	EV_ESTABLISH_REQ,	lc_activate},
};
/* *INDENT-ON* */

void
l3_msg(struct PStack *st, int pr, void *arg)
{
	switch (pr) {
		case (DL_DATA | REQUEST):
			if (st->l3.l3m.state == ST_L3_LC_ESTAB) {
				st->l3.l3l2(st, pr, arg);
			} else {
				struct sk_buff *skb = arg;

				skb_queue_tail(&st->l3.squeue, skb);
				FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL); 
			}
			break;
		case (DL_ESTABLISH | REQUEST):
			FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL);
			break;
		case (DL_ESTABLISH | CONFIRM):
			FsmEvent(&st->l3.l3m, EV_ESTABLISH_CNF, NULL);
			break;
		case (DL_ESTABLISH | INDICATION):
			FsmEvent(&st->l3.l3m, EV_ESTABLISH_IND, NULL);
			break;
		case (DL_RELEASE | INDICATION):
			FsmEvent(&st->l3.l3m, EV_RELEASE_IND, NULL);
			break;
		case (DL_RELEASE | CONFIRM):
			FsmEvent(&st->l3.l3m, EV_RELEASE_CNF, NULL);
			break;
		case (DL_RELEASE | REQUEST):
			FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
			break;
	}
}

int __init
Isdnl3New(void)
{
	l3fsm.state_count = L3_STATE_COUNT;
	l3fsm.event_count = L3_EVENT_COUNT;
	l3fsm.strEvent = strL3Event;
	l3fsm.strState = strL3State;
	return FsmNew(&l3fsm, L3FnList, ARRAY_SIZE(L3FnList));
}

void
Isdnl3Free(void)
{
	FsmFree(&l3fsm);
}
Commit	Line	Data
1da177e4 LT	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>
5a0e3ad6	19	#include <linux/slab.h>
1da177e4 LT	20	#include "hisax.h"
1da177e4 LT	21	#include "isdnl3.h"
1da177e4 LT	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 void
	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 *
	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
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
143	newcallref(void)
144	{
145	if (OrigCallRef == 127)
146	OrigCallRef = 1;
147	else
148	OrigCallRef++;
149	return (OrigCallRef);
150	}
151
152	void
153	newl3state(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
162	static void
163	L3ExpireTimer(struct L3Timer *t)
164	{
165	t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc);
166	}
167
168	void
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
178	L3DelTimer(struct L3Timer *t)
179	{
180	del_timer(&t->tl);
181	}
182
183	int
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
199	StopAllL3Timer(struct l3_process *pc)
200	{
201	L3DelTimer(&pc->timer);
202	}
203
204	struct sk_buff *
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
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
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
1da177e4 LT	235	struct l3_process
	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
	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
	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");
b03efcfb	293	if (skb_queue_empty(&p->st->l3.squeue)) {
1da177e4 LT	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
	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
	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
672c3fd9	381	static void
1da177e4 LT	382	isdnl3_trans(struct PStack st, int pr, void arg) {
	383	st->l3.l3l2(st, pr, arg);
	384	}
	385
	386	void
	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
	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
	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
	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
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
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
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
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
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
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
1da177e4 LT	547	void
	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
	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;
ba2d6ccb	589	return FsmNew(&l3fsm, L3FnList, ARRAY_SIZE(L3FnList));
1da177e4 LT	590	}
	591
	592	void
	593	Isdnl3Free(void)
	594	{
	595	FsmFree(&l3fsm);
	596	}