isdnloop.c

linux-2.6.15.6

 * 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];

	save_flags(flags);
	cli();
	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);
	restore_flags(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;

	save_flags(flags);
	cli();
	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]);
	restore_flags(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;

	save_flags(flags);
	cli();
	del_timer(&card->c_timer[ch]);
	restore_flags(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) {
				save_flags(flags);
				cli();
				/* channel idle? */
				if (!(cc->rcard[ch])) {
					/* Check SI */
					if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
						restore_flags(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;
					restore_flags(flags);
					return 0;
				} else {
					restore_flags(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;

	save_flags(flags);
	cli();
	if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
		card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
		del_timer(&card->st_timer);
		del_timer(&card->rb_timer);