--- /dev/null
+/* $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/slab.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include "isdnloop.h"
+
+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]) {
+ skb = skb_dequeue(&card->bqueue[ch]);
+ if (skb) {
+ 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;
+
+ skb = skb_dequeue(&card->dqueue);
+ if (skb)
+ 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) {
+ skb_copy_from_linear_data(skb,
+ skb_put(nskb, len), 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);
+ skb = dev_alloc_skb(len);
+ if (!skb) {
+ 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[64];
+
+ snprintf(buf, sizeof(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;
+ if (strlen(p) >= sizeof(card->eazlist[0]))
+ break;
+ 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, preceding 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;
+
+ for (i = 0; i < 3; i++) {
+ if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i])))
+ return -EINVAL;
+ }
+
+ 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++) {
+ strlcpy(card->s0num[i], sdef.num[i],
+ sizeof(card->s0num[0]));
+ }
+ 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;
+ }
+ strlcpy(card->s0num[0], sdef.num[0], sizeof(card->s0num[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[80];
+ 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 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");
+ snprintf(cbuf, sizeof(cbuf),
+ "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
+ dcode, p, 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;
+ card = kzalloc(sizeof(isdnloop_card), GFP_KERNEL);
+ if (!card) {
+ printk(KERN_WARNING
+ "isdnloop: (%s) Could not allocate card-struct.\n", id);
+ return (isdnloop_card *) 0;
+ }
+ 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);
+ spin_lock_init(&card->isdnloop_lock);
+ 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;
+ card = isdnloop_initcard(id1);
+ if (!card) {
+ return -EIO;
+ }
+ printk(KERN_INFO
+ "isdnloop: (%s) virtual card added\n",
+ card->interface.id);
+ return 0;
+}
+
+static int __init
+isdnloop_init(void)
+{
+ 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);
Code Review / kvmfornfv.git / blobdiff