Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 594 insertions, 0 deletions

diff --git a/drivers/isdn/hisax/isdnl3.c b/drivers/isdn/hisax/isdnl3.c
new file mode 100644
index 000000000..bb3f9ec62
--- /dev/null
+++ b/drivers/isdn/hisax/isdnl3.c
@@ -0,0 +1,594 @@
+/* $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 __printf(2, 3) 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, "%s cr %d %d --> %d", __func__,
+			 pc->callref & 0x7F,
+			 pc->state, state);
+	pc->state = state;
+}
+
+static void
+L3ExpireTimer(struct timer_list *timer)
+{
+	struct L3Timer *t = from_timer(t, timer, tl);
+	t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc);
+}
+
+void
+L3InitTimer(struct l3_process *pc, struct L3Timer *t)
+{
+	t->pc = pc;
+	timer_setup(&t->tl, L3ExpireTimer, 0);
+}
+
+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;
+	}
+	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);
+}