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kernel-ark/drivers/isdn/isdnloop/isdnloop.c
Jeff Garzik 7786ce192f [PATCH] ISDN: check for userspace copy faults 
Most of the ISDN ->readstat() implementations needed to check
copy_to_user() and put_user() return values.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-17 08:18:49 -07:00

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/* $Id: isdnloop.c,v 1.11.6.7 2001/11/11 19:54:31 kai Exp $
*
* ISDN low-level module implementing a dummy loop driver.
*
* Copyright 1997 by Fritz Elfert (fritz@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/module.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/sched.h>
#include "isdnloop.h"
static char *revision = "$Revision: 1.11.6.7 $";
static char *isdnloop_id = "loop0";
MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
MODULE_AUTHOR("Fritz Elfert");
MODULE_LICENSE("GPL");
module_param(isdnloop_id, charp, 0);
MODULE_PARM_DESC(isdnloop_id, "ID-String of first card");
static int isdnloop_addcard(char *);
/*
* Free queue completely.
*
* Parameter:
* card = pointer to card struct
* channel = channel number
*/
static void
isdnloop_free_queue(isdnloop_card * card, int channel)
{
struct sk_buff_head *queue = &card->bqueue[channel];
skb_queue_purge(queue);
card->sndcount[channel] = 0;
}
/*
* Send B-Channel data to another virtual card.
* This routine is called via timer-callback from isdnloop_pollbchan().
*
* Parameter:
* card = pointer to card struct.
* ch = channel number (0-based)
*/
static void
isdnloop_bchan_send(isdnloop_card * card, int ch)
{
isdnloop_card *rcard = card->rcard[ch];
int rch = card->rch[ch], len, ack;
struct sk_buff *skb;
isdn_ctrl cmd;
while (card->sndcount[ch]) {
if ((skb = skb_dequeue(&card->bqueue[ch]))) {
len = skb->len;
card->sndcount[ch] -= len;
ack = *(skb->head); /* used as scratch area */
cmd.driver = card->myid;
cmd.arg = ch;
if (rcard){
rcard->interface.rcvcallb_skb(rcard->myid, rch, skb);
} else {
printk(KERN_WARNING "isdnloop: no rcard, skb dropped\n");
dev_kfree_skb(skb);
};
cmd.command = ISDN_STAT_BSENT;
cmd.parm.length = len;
card->interface.statcallb(&cmd);
} else
card->sndcount[ch] = 0;
}
}
/*
* Send/Receive Data to/from the B-Channel.
* This routine is called via timer-callback.
* It schedules itself while any B-Channel is open.
*
* Parameter:
* data = pointer to card struct, set by kernel timer.data
*/
static void
isdnloop_pollbchan(unsigned long data)
{
isdnloop_card *card = (isdnloop_card *) data;
unsigned long flags;
if (card->flags & ISDNLOOP_FLAGS_B1ACTIVE)
isdnloop_bchan_send(card, 0);
if (card->flags & ISDNLOOP_FLAGS_B2ACTIVE)
isdnloop_bchan_send(card, 1);
if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE)) {
/* schedule b-channel polling again */
spin_lock_irqsave(&card->isdnloop_lock, flags);
card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
add_timer(&card->rb_timer);
card->flags |= ISDNLOOP_FLAGS_RBTIMER;
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
} else
card->flags &= ~ISDNLOOP_FLAGS_RBTIMER;
}
/*
* Parse ICN-type setup string and fill fields of setup-struct
* with parsed data.
*
* Parameter:
* setup = setup string, format: [caller-id],si1,si2,[called-id]
* cmd = pointer to struct to be filled.
*/
static void
isdnloop_parse_setup(char *setup, isdn_ctrl * cmd)
{
char *t = setup;
char *s = strchr(t, ',');
*s++ = '\0';
strlcpy(cmd->parm.setup.phone, t, sizeof(cmd->parm.setup.phone));
s = strchr(t = s, ',');
*s++ = '\0';
if (!strlen(t))
cmd->parm.setup.si1 = 0;
else
cmd->parm.setup.si1 = simple_strtoul(t, NULL, 10);
s = strchr(t = s, ',');
*s++ = '\0';
if (!strlen(t))
cmd->parm.setup.si2 = 0;
else
cmd->parm.setup.si2 =
simple_strtoul(t, NULL, 10);
strlcpy(cmd->parm.setup.eazmsn, s, sizeof(cmd->parm.setup.eazmsn));
cmd->parm.setup.plan = 0;
cmd->parm.setup.screen = 0;
}
typedef struct isdnloop_stat {
char *statstr;
int command;
int action;
} isdnloop_stat;
/* *INDENT-OFF* */
static isdnloop_stat isdnloop_stat_table[] =
{
{"BCON_", ISDN_STAT_BCONN, 1}, /* B-Channel connected */
{"BDIS_", ISDN_STAT_BHUP, 2}, /* B-Channel disconnected */
{"DCON_", ISDN_STAT_DCONN, 0}, /* D-Channel connected */
{"DDIS_", ISDN_STAT_DHUP, 0}, /* D-Channel disconnected */
{"DCAL_I", ISDN_STAT_ICALL, 3}, /* Incoming call dialup-line */
{"DSCA_I", ISDN_STAT_ICALL, 3}, /* Incoming call 1TR6-SPV */
{"FCALL", ISDN_STAT_ICALL, 4}, /* Leased line connection up */
{"CIF", ISDN_STAT_CINF, 5}, /* Charge-info, 1TR6-type */
{"AOC", ISDN_STAT_CINF, 6}, /* Charge-info, DSS1-type */
{"CAU", ISDN_STAT_CAUSE, 7}, /* Cause code */
{"TEI OK", ISDN_STAT_RUN, 0}, /* Card connected to wallplug */
{"E_L1: ACT FAIL", ISDN_STAT_BHUP, 8}, /* Layer-1 activation failed */
{"E_L2: DATA LIN", ISDN_STAT_BHUP, 8}, /* Layer-2 data link lost */
{"E_L1: ACTIVATION FAILED",
ISDN_STAT_BHUP, 8}, /* Layer-1 activation failed */
{NULL, 0, -1}
};
/* *INDENT-ON* */
/*
* Parse Status message-strings from virtual card.
* Depending on status, call statcallb for sending messages to upper
* levels. Also set/reset B-Channel active-flags.
*
* Parameter:
* status = status string to parse.
* channel = channel where message comes from.
* card = card where message comes from.
*/
static void
isdnloop_parse_status(u_char * status, int channel, isdnloop_card * card)
{
isdnloop_stat *s = isdnloop_stat_table;
int action = -1;
isdn_ctrl cmd;
while (s->statstr) {
if (!strncmp(status, s->statstr, strlen(s->statstr))) {
cmd.command = s->command;
action = s->action;
break;
}
s++;
}
if (action == -1)
return;
cmd.driver = card->myid;
cmd.arg = channel;
switch (action) {
case 1:
/* BCON_x */
card->flags |= (channel) ?
ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE;
break;
case 2:
/* BDIS_x */
card->flags &= ~((channel) ?
ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE);
isdnloop_free_queue(card, channel);
break;
case 3:
/* DCAL_I and DSCA_I */
isdnloop_parse_setup(status + 6, &cmd);
break;
case 4:
/* FCALL */
sprintf(cmd.parm.setup.phone, "LEASED%d", card->myid);
sprintf(cmd.parm.setup.eazmsn, "%d", channel + 1);
cmd.parm.setup.si1 = 7;
cmd.parm.setup.si2 = 0;
cmd.parm.setup.plan = 0;
cmd.parm.setup.screen = 0;
break;
case 5:
/* CIF */
strlcpy(cmd.parm.num, status + 3, sizeof(cmd.parm.num));
break;
case 6:
/* AOC */
snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%d",
(int) simple_strtoul(status + 7, NULL, 16));
break;
case 7:
/* CAU */
status += 3;
if (strlen(status) == 4)
snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%s%c%c",
status + 2, *status, *(status + 1));
else
strlcpy(cmd.parm.num, status + 1, sizeof(cmd.parm.num));
break;
case 8:
/* Misc Errors on L1 and L2 */
card->flags &= ~ISDNLOOP_FLAGS_B1ACTIVE;
isdnloop_free_queue(card, 0);
cmd.arg = 0;
cmd.driver = card->myid;
card->interface.statcallb(&cmd);
cmd.command = ISDN_STAT_DHUP;
cmd.arg = 0;
cmd.driver = card->myid;
card->interface.statcallb(&cmd);
cmd.command = ISDN_STAT_BHUP;
card->flags &= ~ISDNLOOP_FLAGS_B2ACTIVE;
isdnloop_free_queue(card, 1);
cmd.arg = 1;
cmd.driver = card->myid;
card->interface.statcallb(&cmd);
cmd.command = ISDN_STAT_DHUP;
cmd.arg = 1;
cmd.driver = card->myid;
break;
}
card->interface.statcallb(&cmd);
}
/*
* Store a cwcharacter into ringbuffer for reading from /dev/isdnctrl
*
* Parameter:
* card = pointer to card struct.
* c = char to store.
*/
static void
isdnloop_putmsg(isdnloop_card * card, unsigned char c)
{
ulong flags;
spin_lock_irqsave(&card->isdnloop_lock, flags);
*card->msg_buf_write++ = (c == 0xff) ? '\n' : c;
if (card->msg_buf_write == card->msg_buf_read) {
if (++card->msg_buf_read > card->msg_buf_end)
card->msg_buf_read = card->msg_buf;
}
if (card->msg_buf_write > card->msg_buf_end)
card->msg_buf_write = card->msg_buf;
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
/*
* Poll a virtual cards message queue.
* If there are new status-replies from the card, copy them to
* ringbuffer for reading on /dev/isdnctrl and call
* isdnloop_parse_status() for processing them. Watch for special
* Firmware bootmessage and parse it, to get the D-Channel protocol.
* If there are B-Channels open, initiate a timer-callback to
* isdnloop_pollbchan().
* This routine is called periodically via timer interrupt.
*
* Parameter:
* data = pointer to card struct
*/
static void
isdnloop_polldchan(unsigned long data)
{
isdnloop_card *card = (isdnloop_card *) data;
struct sk_buff *skb;
int avail;
int left;
u_char c;
int ch;
unsigned long flags;
u_char *p;
isdn_ctrl cmd;
if ((skb = skb_dequeue(&card->dqueue)))
avail = skb->len;
else
avail = 0;
for (left = avail; left > 0; left--) {
c = *skb->data;
skb_pull(skb, 1);
isdnloop_putmsg(card, c);
card->imsg[card->iptr] = c;
if (card->iptr < 59)
card->iptr++;
if (!skb->len) {
avail++;
isdnloop_putmsg(card, '\n');
card->imsg[card->iptr] = 0;
card->iptr = 0;
if (card->imsg[0] == '0' && card->imsg[1] >= '0' &&
card->imsg[1] <= '2' && card->imsg[2] == ';') {
ch = (card->imsg[1] - '0') - 1;
p = &card->imsg[3];
isdnloop_parse_status(p, ch, card);
} else {
p = card->imsg;
if (!strncmp(p, "DRV1.", 5)) {
printk(KERN_INFO "isdnloop: (%s) %s\n", CID, p);
if (!strncmp(p + 7, "TC", 2)) {
card->ptype = ISDN_PTYPE_1TR6;
card->interface.features |= ISDN_FEATURE_P_1TR6;
printk(KERN_INFO
"isdnloop: (%s) 1TR6-Protocol loaded and running\n", CID);
}
if (!strncmp(p + 7, "EC", 2)) {
card->ptype = ISDN_PTYPE_EURO;
card->interface.features |= ISDN_FEATURE_P_EURO;
printk(KERN_INFO
"isdnloop: (%s) Euro-Protocol loaded and running\n", CID);
}
continue;
}
}
}
}
if (avail) {
cmd.command = ISDN_STAT_STAVAIL;
cmd.driver = card->myid;
cmd.arg = avail;
card->interface.statcallb(&cmd);
}
if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE))
if (!(card->flags & ISDNLOOP_FLAGS_RBTIMER)) {
/* schedule b-channel polling */
card->flags |= ISDNLOOP_FLAGS_RBTIMER;
spin_lock_irqsave(&card->isdnloop_lock, flags);
del_timer(&card->rb_timer);
card->rb_timer.function = isdnloop_pollbchan;
card->rb_timer.data = (unsigned long) card;
card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
add_timer(&card->rb_timer);
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
/* schedule again */
spin_lock_irqsave(&card->isdnloop_lock, flags);
card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
add_timer(&card->st_timer);
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
/*
* Append a packet to the transmit buffer-queue.
*
* Parameter:
* channel = Number of B-channel
* skb = packet to send.
* card = pointer to card-struct
* Return:
* Number of bytes transferred, -E??? on error
*/
static int
isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card * card)
{
int len = skb->len;
unsigned long flags;
struct sk_buff *nskb;
if (len > 4000) {
printk(KERN_WARNING
"isdnloop: Send packet too large\n");
return -EINVAL;
}
if (len) {
if (!(card->flags & (channel) ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE))
return 0;
if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
return 0;
spin_lock_irqsave(&card->isdnloop_lock, flags);
nskb = dev_alloc_skb(skb->len);
if (nskb) {
memcpy(skb_put(nskb, len), skb->data, len);
skb_queue_tail(&card->bqueue[channel], nskb);
dev_kfree_skb(skb);
} else
len = 0;
card->sndcount[channel] += len;
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
return len;
}
/*
* Read the messages from the card's ringbuffer
*
* Parameter:
* buf = pointer to buffer.
* len = number of bytes to read.
* user = flag, 1: called from userlevel 0: called from kernel.
* card = pointer to card struct.
* Return:
* number of bytes actually transferred.
*/
static int
isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card * card)
{
int count;
u_char __user *p;
for (p = buf, count = 0; count < len; p++, count++) {
if (card->msg_buf_read == card->msg_buf_write)
return count;
if (put_user(*card->msg_buf_read++, p))
return -EFAULT;
if (card->msg_buf_read > card->msg_buf_end)
card->msg_buf_read = card->msg_buf;
}
return count;
}
/*
* Simulate a card's response by appending it to the cards
* message queue.
*
* Parameter:
* card = pointer to card struct.
* s = pointer to message-string.
* ch = channel: 0 = generic messages, 1 and 2 = D-channel messages.
* Return:
* 0 on success, 1 on memory squeeze.
*/
static int
isdnloop_fake(isdnloop_card * card, char *s, int ch)
{
struct sk_buff *skb;
int len = strlen(s) + ((ch >= 0) ? 3 : 0);
if (!(skb = dev_alloc_skb(len))) {
printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
return 1;
}
if (ch >= 0)
sprintf(skb_put(skb, 3), "%02d;", ch);
memcpy(skb_put(skb, strlen(s)), s, strlen(s));
skb_queue_tail(&card->dqueue, skb);
return 0;
}
/* *INDENT-OFF* */
static isdnloop_stat isdnloop_cmd_table[] =
{
{"BCON_R", 0, 1}, /* B-Channel connect */
{"BCON_I", 0, 17}, /* B-Channel connect ind */
{"BDIS_R", 0, 2}, /* B-Channel disconnect */
{"DDIS_R", 0, 3}, /* D-Channel disconnect */
{"DCON_R", 0, 16}, /* D-Channel connect */
{"DSCA_R", 0, 4}, /* Dial 1TR6-SPV */
{"DCAL_R", 0, 5}, /* Dial */
{"EAZC", 0, 6}, /* Clear EAZ listener */
{"EAZ", 0, 7}, /* Set EAZ listener */
{"SEEAZ", 0, 8}, /* Get EAZ listener */
{"MSN", 0, 9}, /* Set/Clear MSN listener */
{"MSALL", 0, 10}, /* Set multi MSN listeners */
{"SETSIL", 0, 11}, /* Set SI list */
{"SEESIL", 0, 12}, /* Get SI list */
{"SILC", 0, 13}, /* Clear SI list */
{"LOCK", 0, -1}, /* LOCK channel */
{"UNLOCK", 0, -1}, /* UNLOCK channel */
{"FV2ON", 1, 14}, /* Leased mode on */
{"FV2OFF", 1, 15}, /* Leased mode off */
{NULL, 0, -1}
};
/* *INDENT-ON* */
/*
* Simulate an error-response from a card.
*
* Parameter:
* card = pointer to card struct.
*/
static void
isdnloop_fake_err(isdnloop_card * card)
{
char buf[60];
sprintf(buf, "E%s", card->omsg);
isdnloop_fake(card, buf, -1);
isdnloop_fake(card, "NAK", -1);
}
static u_char ctable_eu[] =
{0x00, 0x11, 0x01, 0x12};
static u_char ctable_1t[] =
{0x00, 0x3b, 0x01, 0x3a};
/*
* Assemble a simplified cause message depending on the
* D-channel protocol used.
*
* Parameter:
* card = pointer to card struct.
* loc = location: 0 = local, 1 = remote.
* cau = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
* Return:
* Pointer to buffer containing the assembled message.
*/
static char *
isdnloop_unicause(isdnloop_card * card, int loc, int cau)
{
static char buf[6];
switch (card->ptype) {
case ISDN_PTYPE_EURO:
sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
break;
case ISDN_PTYPE_1TR6:
sprintf(buf, "%02X44", ctable_1t[cau]);
break;
default:
return ("0000");
}
return (buf);
}
/*
* Release a virtual connection. Called from timer interrupt, when
* called party did not respond.
*
* Parameter:
* card = pointer to card struct.
* ch = channel (0-based)
*/
static void
isdnloop_atimeout(isdnloop_card * card, int ch)
{
unsigned long flags;
char buf[60];
spin_lock_irqsave(&card->isdnloop_lock, flags);
if (card->rcard) {
isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
card->rcard[ch]->rcard[card->rch[ch]] = NULL;
card->rcard[ch] = NULL;
}
isdnloop_fake(card, "DDIS_I", ch + 1);
/* No user responding */
sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
isdnloop_fake(card, buf, ch + 1);
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
/*
* Wrapper for isdnloop_atimeout().
*/
static void
isdnloop_atimeout0(unsigned long data)
{
isdnloop_card *card = (isdnloop_card *) data;
isdnloop_atimeout(card, 0);
}
/*
* Wrapper for isdnloop_atimeout().
*/
static void
isdnloop_atimeout1(unsigned long data)
{
isdnloop_card *card = (isdnloop_card *) data;
isdnloop_atimeout(card, 1);
}
/*
* Install a watchdog for a user, not responding.
*
* Parameter:
* card = pointer to card struct.
* ch = channel to watch for.
*/
static void
isdnloop_start_ctimer(isdnloop_card * card, int ch)
{
unsigned long flags;
spin_lock_irqsave(&card->isdnloop_lock, flags);
init_timer(&card->c_timer[ch]);
card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
if (ch)
card->c_timer[ch].function = isdnloop_atimeout1;
else
card->c_timer[ch].function = isdnloop_atimeout0;
card->c_timer[ch].data = (unsigned long) card;
add_timer(&card->c_timer[ch]);
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
/*
* Kill a pending channel watchdog.
*
* Parameter:
* card = pointer to card struct.
* ch = channel (0-based).
*/
static void
isdnloop_kill_ctimer(isdnloop_card * card, int ch)
{
unsigned long flags;
spin_lock_irqsave(&card->isdnloop_lock, flags);
del_timer(&card->c_timer[ch]);
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
static u_char si2bit[] =
{0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
static u_char bit2si[] =
{1, 5, 7};
/*
* Try finding a listener for an outgoing call.
*
* Parameter:
* card = pointer to calling card.
* p = pointer to ICN-type setup-string.
* lch = channel of calling card.
* cmd = pointer to struct to be filled when parsing setup.
* Return:
* 0 = found match, alerting should happen.
* 1 = found matching number but it is busy.
* 2 = no matching listener.
* 3 = found matching number but SI does not match.
*/
static int
isdnloop_try_call(isdnloop_card * card, char *p, int lch, isdn_ctrl * cmd)
{
isdnloop_card *cc = cards;
unsigned long flags;
int ch;
int num_match;
int i;
char *e;
char nbuf[32];
isdnloop_parse_setup(p, cmd);
while (cc) {
for (ch = 0; ch < 2; ch++) {
/* Exclude ourself */
if ((cc == card) && (ch == lch))
continue;
num_match = 0;
switch (cc->ptype) {
case ISDN_PTYPE_EURO:
for (i = 0; i < 3; i++)
if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
num_match = 1;
break;
case ISDN_PTYPE_1TR6:
e = cc->eazlist[ch];
while (*e) {
sprintf(nbuf, "%s%c", cc->s0num[0], *e);
if (!(strcmp(nbuf, cmd->parm.setup.phone)))
num_match = 1;
e++;
}
}
if (num_match) {
spin_lock_irqsave(&card->isdnloop_lock, flags);
/* channel idle? */
if (!(cc->rcard[ch])) {
/* Check SI */
if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
return 3;
}
/* ch is idle, si and number matches */
cc->rcard[ch] = card;
cc->rch[ch] = lch;
card->rcard[lch] = cc;
card->rch[lch] = ch;
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
return 0;
} else {
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
/* num matches, but busy */
if (ch == 1)
return 1;
}
}
}
cc = cc->next;
}
return 2;
}
/*
* Depending on D-channel protocol and caller/called, modify
* phone number.
*
* Parameter:
* card = pointer to card struct.
* phone = pointer phone number.
* caller = flag: 1 = caller, 0 = called.
* Return:
* pointer to new phone number.
*/
static char *
isdnloop_vstphone(isdnloop_card * card, char *phone, int caller)
{
int i;
static char nphone[30];
if (!card) {
printk("BUG!!!\n");
return "";
}
switch (card->ptype) {
case ISDN_PTYPE_EURO:
if (caller) {
for (i = 0; i < 2; i++)
if (!(strcmp(card->s0num[i], phone)))
return (phone);
return (card->s0num[0]);
}
return (phone);
break;
case ISDN_PTYPE_1TR6:
if (caller) {
sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
return (nphone);
} else
return (&phone[strlen(phone) - 1]);
break;
}
return "";
}
/*
* Parse an ICN-type command string sent to the 'card'.
* Perform misc. actions depending on the command.
*
* Parameter:
* card = pointer to card struct.
*/
static void
isdnloop_parse_cmd(isdnloop_card * card)
{
char *p = card->omsg;
isdn_ctrl cmd;
char buf[60];
isdnloop_stat *s = isdnloop_cmd_table;
int action = -1;
int i;
int ch;
if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
isdnloop_fake_err(card);
return;
}
ch = card->omsg[1] - '0';
if ((ch < 0) || (ch > 2)) {
isdnloop_fake_err(card);
return;
}
p += 3;
while (s->statstr) {
if (!strncmp(p, s->statstr, strlen(s->statstr))) {
action = s->action;
if (s->command && (ch != 0)) {
isdnloop_fake_err(card);
return;
}
break;
}
s++;
}
if (action == -1)
return;
switch (action) {
case 1:
/* 0x;BCON_R */
if (card->rcard[ch - 1]) {
isdnloop_fake(card->rcard[ch - 1], "BCON_I",
card->rch[ch - 1] + 1);
isdnloop_fake(card, "BCON_C", ch);
}
break;
case 17:
/* 0x;BCON_I */
if (card->rcard[ch - 1]) {
isdnloop_fake(card->rcard[ch - 1], "BCON_C",
card->rch[ch - 1] + 1);
}
break;
case 2:
/* 0x;BDIS_R */
isdnloop_fake(card, "BDIS_C", ch);
if (card->rcard[ch - 1]) {
isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
card->rch[ch - 1] + 1);
}
break;
case 16:
/* 0x;DCON_R */
isdnloop_kill_ctimer(card, ch - 1);
if (card->rcard[ch - 1]) {
isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
isdnloop_fake(card->rcard[ch - 1], "DCON_C",
card->rch[ch - 1] + 1);
isdnloop_fake(card, "DCON_C", ch);
}
break;
case 3:
/* 0x;DDIS_R */
isdnloop_kill_ctimer(card, ch - 1);
if (card->rcard[ch - 1]) {
isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
card->rch[ch - 1] + 1);
card->rcard[ch - 1] = NULL;
}
isdnloop_fake(card, "DDIS_C", ch);
break;
case 4:
/* 0x;DSCA_Rdd,yy,zz,oo */
if (card->ptype != ISDN_PTYPE_1TR6) {
isdnloop_fake_err(card);
return;
}
/* Fall through */
case 5:
/* 0x;DCAL_Rdd,yy,zz,oo */
p += 6;
switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
case 0:
/* Alerting */
sprintf(buf, "D%s_I%s,%02d,%02d,%s",
(action == 4) ? "SCA" : "CAL",
isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
cmd.parm.setup.si1,
cmd.parm.setup.si2,
isdnloop_vstphone(card->rcard[ch - 1],
cmd.parm.setup.phone, 0));
isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
/* Fall through */
case 3:
/* si1 does not match, don't alert but start timer */
isdnloop_start_ctimer(card, ch - 1);
break;
case 1:
/* Remote busy */
isdnloop_fake(card, "DDIS_I", ch);
sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
isdnloop_fake(card, buf, ch);
break;
case 2:
/* No such user */
isdnloop_fake(card, "DDIS_I", ch);
sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
isdnloop_fake(card, buf, ch);
break;
}
break;
case 6:
/* 0x;EAZC */
card->eazlist[ch - 1][0] = '\0';
break;
case 7:
/* 0x;EAZ */
p += 3;
strcpy(card->eazlist[ch - 1], p);
break;
case 8:
/* 0x;SEEAZ */
sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
isdnloop_fake(card, buf, ch + 1);
break;
case 9:
/* 0x;MSN */
break;
case 10:
/* 0x;MSNALL */
break;
case 11:
/* 0x;SETSIL */
p += 6;
i = 0;
while (strchr("0157", *p)) {
if (i)
card->sil[ch - 1] |= si2bit[*p - '0'];
i = (*p++ == '0');
}
if (*p)
isdnloop_fake_err(card);
break;
case 12:
/* 0x;SEESIL */
sprintf(buf, "SIN-LIST: ");
p = buf + 10;
for (i = 0; i < 3; i++)
if (card->sil[ch - 1] & (1 << i))
p += sprintf(p, "%02d", bit2si[i]);
isdnloop_fake(card, buf, ch + 1);
break;
case 13:
/* 0x;SILC */
card->sil[ch - 1] = 0;
break;
case 14:
/* 00;FV2ON */
break;
case 15:
/* 00;FV2OFF */
break;
}
}
/*
* Put command-strings into the of the 'card'. In reality, execute them
* right in place by calling isdnloop_parse_cmd(). Also copy every
* command to the read message ringbuffer, preceeding it with a '>'.
* These mesagges can be read at /dev/isdnctrl.
*
* Parameter:
* buf = pointer to command buffer.
* len = length of buffer data.
* user = flag: 1 = called form userlevel, 0 called from kernel.
* card = pointer to card struct.
* Return:
* number of bytes transferred (currently always equals len).
*/
static int
isdnloop_writecmd(const u_char * buf, int len, int user, isdnloop_card * card)
{
int xcount = 0;
int ocount = 1;
isdn_ctrl cmd;
while (len) {
int count = len;
u_char *p;
u_char msg[0x100];
if (count > 255)
count = 255;
if (user) {
if (copy_from_user(msg, buf, count))
return -EFAULT;
} else
memcpy(msg, buf, count);
isdnloop_putmsg(card, '>');
for (p = msg; count > 0; count--, p++) {
len--;
xcount++;
isdnloop_putmsg(card, *p);
card->omsg[card->optr] = *p;
if (*p == '\n') {
card->omsg[card->optr] = '\0';
card->optr = 0;
isdnloop_parse_cmd(card);
if (len) {
isdnloop_putmsg(card, '>');
ocount++;
}
} else {
if (card->optr < 59)
card->optr++;
}
ocount++;
}
}
cmd.command = ISDN_STAT_STAVAIL;
cmd.driver = card->myid;
cmd.arg = ocount;
card->interface.statcallb(&cmd);
return xcount;
}
/*
* Delete card's pending timers, send STOP to linklevel
*/
static void
isdnloop_stopcard(isdnloop_card * card)
{
unsigned long flags;
isdn_ctrl cmd;
spin_lock_irqsave(&card->isdnloop_lock, flags);
if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
del_timer(&card->st_timer);
del_timer(&card->rb_timer);
del_timer(&card->c_timer[0]);
del_timer(&card->c_timer[1]);
cmd.command = ISDN_STAT_STOP;
cmd.driver = card->myid;
card->interface.statcallb(&cmd);
}
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
}
/*
* Stop all cards before unload.
*/
static void
isdnloop_stopallcards(void)
{
isdnloop_card *p = cards;
while (p) {
isdnloop_stopcard(p);
p = p->next;
}
}
/*
* Start a 'card'. Simulate card's boot message and set the phone
* number(s) of the virtual 'S0-Interface'. Install D-channel
* poll timer.
*
* Parameter:
* card = pointer to card struct.
* sdefp = pointer to struct holding ioctl parameters.
* Return:
* 0 on success, -E??? otherwise.
*/
static int
isdnloop_start(isdnloop_card * card, isdnloop_sdef * sdefp)
{
unsigned long flags;
isdnloop_sdef sdef;
int i;
if (card->flags & ISDNLOOP_FLAGS_RUNNING)
return -EBUSY;
if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
return -EFAULT;
spin_lock_irqsave(&card->isdnloop_lock, flags);
switch (sdef.ptype) {
case ISDN_PTYPE_EURO:
if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
-1)) {
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
return -ENOMEM;
}
card->sil[0] = card->sil[1] = 4;
if (isdnloop_fake(card, "TEI OK", 0)) {
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
return -ENOMEM;
}
for (i = 0; i < 3; i++)
strcpy(card->s0num[i], sdef.num[i]);
break;
case ISDN_PTYPE_1TR6:
if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
-1)) {
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
return -ENOMEM;
}
card->sil[0] = card->sil[1] = 4;
if (isdnloop_fake(card, "TEI OK", 0)) {
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
return -ENOMEM;
}
strcpy(card->s0num[0], sdef.num[0]);
card->s0num[1][0] = '\0';
card->s0num[2][0] = '\0';
break;
default:
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
sdef.ptype);
return -EINVAL;
}
init_timer(&card->st_timer);
card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
card->st_timer.function = isdnloop_polldchan;
card->st_timer.data = (unsigned long) card;
add_timer(&card->st_timer);
card->flags |= ISDNLOOP_FLAGS_RUNNING;
spin_unlock_irqrestore(&card->isdnloop_lock, flags);
return 0;
}
/*
* Main handler for commands sent by linklevel.
*/
static int
isdnloop_command(isdn_ctrl * c, isdnloop_card * card)
{
ulong a;
int i;
char cbuf[60];
isdn_ctrl cmd;
isdnloop_cdef cdef;
switch (c->command) {
case ISDN_CMD_IOCTL:
memcpy(&a, c->parm.num, sizeof(ulong));
switch (c->arg) {
case ISDNLOOP_IOCTL_DEBUGVAR:
return (ulong) card;
case ISDNLOOP_IOCTL_STARTUP:
if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
return -EFAULT;
return (isdnloop_start(card, (isdnloop_sdef *) a));
break;
case ISDNLOOP_IOCTL_ADDCARD:
if (copy_from_user((char *)&cdef,
(char *)a,
sizeof(cdef)))
return -EFAULT;
return (isdnloop_addcard(cdef.id1));
break;
case ISDNLOOP_IOCTL_LEASEDCFG:
if (a) {
if (!card->leased) {
card->leased = 1;
while (card->ptype == ISDN_PTYPE_UNKNOWN)
schedule_timeout_interruptible(10);
schedule_timeout_interruptible(10);
sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
printk(KERN_INFO
"isdnloop: (%s) Leased-line mode enabled\n",
CID);
cmd.command = ISDN_STAT_RUN;
cmd.driver = card->myid;
cmd.arg = 0;
card->interface.statcallb(&cmd);
}
} else {
if (card->leased) {
card->leased = 0;
sprintf(cbuf, "00;FV2OFF\n");
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
printk(KERN_INFO
"isdnloop: (%s) Leased-line mode disabled\n",
CID);
cmd.command = ISDN_STAT_RUN;
cmd.driver = card->myid;
cmd.arg = 0;
card->interface.statcallb(&cmd);
}
}
return 0;
default:
return -EINVAL;
}
break;
case ISDN_CMD_DIAL:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
if (card->leased)
break;
if ((c->arg & 255) < ISDNLOOP_BCH) {
char *p;
char dial[50];
char dcode[4];
a = c->arg;
p = c->parm.setup.phone;
if (*p == 's' || *p == 'S') {
/* Dial for SPV */
p++;
strcpy(dcode, "SCA");
} else
/* Normal Dial */
strcpy(dcode, "CAL");
strcpy(dial, p);
sprintf(cbuf, "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
dcode, dial, c->parm.setup.si1,
c->parm.setup.si2, c->parm.setup.eazmsn);
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
}
break;
case ISDN_CMD_ACCEPTD:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
if (c->arg < ISDNLOOP_BCH) {
a = c->arg + 1;
cbuf[0] = 0;
switch (card->l2_proto[a - 1]) {
case ISDN_PROTO_L2_X75I:
sprintf(cbuf, "%02d;BX75\n", (int) a);
break;
#ifdef CONFIG_ISDN_X25
case ISDN_PROTO_L2_X25DTE:
sprintf(cbuf, "%02d;BX2T\n", (int) a);
break;
case ISDN_PROTO_L2_X25DCE:
sprintf(cbuf, "%02d;BX2C\n", (int) a);
break;
#endif
case ISDN_PROTO_L2_HDLC:
sprintf(cbuf, "%02d;BTRA\n", (int) a);
break;
}
if (strlen(cbuf))
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
sprintf(cbuf, "%02d;DCON_R\n", (int) a);
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
}
break;
case ISDN_CMD_ACCEPTB:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
if (c->arg < ISDNLOOP_BCH) {
a = c->arg + 1;
switch (card->l2_proto[a - 1]) {
case ISDN_PROTO_L2_X75I:
sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
break;
#ifdef CONFIG_ISDN_X25
case ISDN_PROTO_L2_X25DTE:
sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
break;
case ISDN_PROTO_L2_X25DCE:
sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
break;
#endif
case ISDN_PROTO_L2_HDLC:
sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
break;
default:
sprintf(cbuf, "%02d;BCON_R\n", (int) a);
}
printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
break;
case ISDN_CMD_HANGUP:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
if (c->arg < ISDNLOOP_BCH) {
a = c->arg + 1;
sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
}
break;
case ISDN_CMD_SETEAZ:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
if (card->leased)
break;
if (c->arg < ISDNLOOP_BCH) {
a = c->arg + 1;
if (card->ptype == ISDN_PTYPE_EURO) {
sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
c->parm.num[0] ? "N" : "ALL", c->parm.num);
} else
sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
}
break;
case ISDN_CMD_CLREAZ:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
if (card->leased)
break;
if (c->arg < ISDNLOOP_BCH) {
a = c->arg + 1;
if (card->ptype == ISDN_PTYPE_EURO)
sprintf(cbuf, "%02d;MSNC\n", (int) a);
else
sprintf(cbuf, "%02d;EAZC\n", (int) a);
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
}
break;
case ISDN_CMD_SETL2:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
if ((c->arg & 255) < ISDNLOOP_BCH) {
a = c->arg;
switch (a >> 8) {
case ISDN_PROTO_L2_X75I:
sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
break;
#ifdef CONFIG_ISDN_X25
case ISDN_PROTO_L2_X25DTE:
sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
break;
case ISDN_PROTO_L2_X25DCE:
sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
break;
#endif
case ISDN_PROTO_L2_HDLC:
sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
break;
case ISDN_PROTO_L2_TRANS:
sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
break;
default:
return -EINVAL;
}
i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
card->l2_proto[a & 255] = (a >> 8);
}
break;
case ISDN_CMD_SETL3:
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
return 0;
default:
return -EINVAL;
}
}
return 0;
}
/*
* Find card with given driverId
*/
static inline isdnloop_card *
isdnloop_findcard(int driverid)
{
isdnloop_card *p = cards;
while (p) {
if (p->myid == driverid)
return p;
p = p->next;
}
return (isdnloop_card *) 0;
}
/*
* Wrapper functions for interface to linklevel
*/
static int
if_command(isdn_ctrl * c)
{
isdnloop_card *card = isdnloop_findcard(c->driver);
if (card)
return (isdnloop_command(c, card));
printk(KERN_ERR
"isdnloop: if_command called with invalid driverId!\n");
return -ENODEV;
}
static int
if_writecmd(const u_char __user *buf, int len, int id, int channel)
{
isdnloop_card *card = isdnloop_findcard(id);
if (card) {
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
return (isdnloop_writecmd(buf, len, 1, card));
}
printk(KERN_ERR
"isdnloop: if_writecmd called with invalid driverId!\n");
return -ENODEV;
}
static int
if_readstatus(u_char __user *buf, int len, int id, int channel)
{
isdnloop_card *card = isdnloop_findcard(id);
if (card) {
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
return (isdnloop_readstatus(buf, len, card));
}
printk(KERN_ERR
"isdnloop: if_readstatus called with invalid driverId!\n");
return -ENODEV;
}
static int
if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
{
isdnloop_card *card = isdnloop_findcard(id);
if (card) {
if (!card->flags & ISDNLOOP_FLAGS_RUNNING)
return -ENODEV;
/* ack request stored in skb scratch area */
*(skb->head) = ack;
return (isdnloop_sendbuf(channel, skb, card));
}
printk(KERN_ERR
"isdnloop: if_sendbuf called with invalid driverId!\n");
return -ENODEV;
}
/*
* Allocate a new card-struct, initialize it
* link it into cards-list and register it at linklevel.
*/
static isdnloop_card *
isdnloop_initcard(char *id)
{
isdnloop_card *card;
int i;
if (!(card = (isdnloop_card *) kmalloc(sizeof(isdnloop_card), GFP_KERNEL))) {
printk(KERN_WARNING
"isdnloop: (%s) Could not allocate card-struct.\n", id);
return (isdnloop_card *) 0;
}
memset((char *) card, 0, sizeof(isdnloop_card));
card->interface.owner = THIS_MODULE;
card->interface.channels = ISDNLOOP_BCH;
card->interface.hl_hdrlen = 1; /* scratch area for storing ack flag*/
card->interface.maxbufsize = 4000;
card->interface.command = if_command;
card->interface.writebuf_skb = if_sendbuf;
card->interface.writecmd = if_writecmd;
card->interface.readstat = if_readstatus;
card->interface.features = ISDN_FEATURE_L2_X75I |
#ifdef CONFIG_ISDN_X25
ISDN_FEATURE_L2_X25DTE |
ISDN_FEATURE_L2_X25DCE |
#endif
ISDN_FEATURE_L2_HDLC |
ISDN_FEATURE_L3_TRANS |
ISDN_FEATURE_P_UNKNOWN;
card->ptype = ISDN_PTYPE_UNKNOWN;
strlcpy(card->interface.id, id, sizeof(card->interface.id));
card->msg_buf_write = card->msg_buf;
card->msg_buf_read = card->msg_buf;
card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
for (i = 0; i < ISDNLOOP_BCH; i++) {
card->l2_proto[i] = ISDN_PROTO_L2_X75I;
skb_queue_head_init(&card->bqueue[i]);
}
skb_queue_head_init(&card->dqueue);
card->isdnloop_lock = SPIN_LOCK_UNLOCKED;
card->next = cards;
cards = card;
if (!register_isdn(&card->interface)) {
cards = cards->next;
printk(KERN_WARNING
"isdnloop: Unable to register %s\n", id);
kfree(card);
return (isdnloop_card *) 0;
}
card->myid = card->interface.channels;
return card;
}
static int
isdnloop_addcard(char *id1)
{
isdnloop_card *card;
if (!(card = isdnloop_initcard(id1))) {
return -EIO;
}
printk(KERN_INFO
"isdnloop: (%s) virtual card added\n",
card->interface.id);
return 0;
}
static int __init
isdnloop_init(void)
{
char *p;
char rev[10];
if ((p = strchr(revision, ':'))) {
strcpy(rev, p + 1);
p = strchr(rev, '$');
*p = 0;
} else
strcpy(rev, " ??? ");
printk(KERN_NOTICE "isdnloop-ISDN-driver Rev%s\n", rev);
if (isdnloop_id)
return (isdnloop_addcard(isdnloop_id));
return 0;
}
static void __exit
isdnloop_exit(void)
{
isdn_ctrl cmd;
isdnloop_card *card = cards;
isdnloop_card *last;
int i;
isdnloop_stopallcards();
while (card) {
cmd.command = ISDN_STAT_UNLOAD;
cmd.driver = card->myid;
card->interface.statcallb(&cmd);
for (i = 0; i < ISDNLOOP_BCH; i++)
isdnloop_free_queue(card, i);
card = card->next;
}
card = cards;
while (card) {
last = card;
skb_queue_purge(&card->dqueue);
card = card->next;
kfree(last);
}
printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
}
module_init(isdnloop_init);
module_exit(isdnloop_exit);
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