- 根目录:
- 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 __attribute__((format(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, "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);
}