drivers/isdn/isdnloop/isdnloop.c

   1 /* $Id: isdnloop.c,v 1.11.6.7 2001/11/11 19:54:31 kai Exp $
   2  *
   3  * ISDN low-level module implementing a dummy loop driver.
   4  *
   5  * Copyright 1997 by Fritz Elfert ([email protected])
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/sched.h>
  17 #include "isdnloop.h"
  18
  19 static char *isdnloop_id = "loop0";
  20
  21 MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
  22 MODULE_AUTHOR("Fritz Elfert");
  23 MODULE_LICENSE("GPL");
  24 module_param(isdnloop_id, charp, 0);
  25 MODULE_PARM_DESC(isdnloop_id, "ID-String of first card");
  26
  27 static int isdnloop_addcard(char *);
  28
  29 /*
  30  * Free queue completely.
  31  *
  32  * Parameter:
  33  *   card    = pointer to card struct
  34  *   channel = channel number
  35  */
  36 static void
  37 isdnloop_free_queue(isdnloop_card *card, int channel)
  38 {
  39         struct sk_buff_head *queue = &card->bqueue[channel];
  40
  41         skb_queue_purge(queue);
  42         card->sndcount[channel] = 0;
  43 }
  44
  45 /*
  46  * Send B-Channel data to another virtual card.
  47  * This routine is called via timer-callback from isdnloop_pollbchan().
  48  *
  49  * Parameter:
  50  *   card = pointer to card struct.
  51  *   ch   = channel number (0-based)
  52  */
  53 static void
  54 isdnloop_bchan_send(isdnloop_card *card, int ch)
  55 {
  56         isdnloop_card *rcard = card->rcard[ch];
  57         int rch = card->rch[ch], len, ack;
  58         struct sk_buff *skb;
  59         isdn_ctrl cmd;
  60
  61         while (card->sndcount[ch]) {
  62                 skb = skb_dequeue(&card->bqueue[ch]);
  63                 if (skb) {
  64                         len = skb->len;
  65                         card->sndcount[ch] -= len;
  66                         ack = *(skb->head); /* used as scratch area */
  67                         cmd.driver = card->myid;
  68                         cmd.arg = ch;
  69                         if (rcard) {
  70                                 rcard->interface.rcvcallb_skb(rcard->myid, rch, skb);
  71                         } else {
  72                                 printk(KERN_WARNING "isdnloop: no rcard, skb dropped\n");
  73                                 dev_kfree_skb(skb);
  74
  75                         };
  76                         cmd.command = ISDN_STAT_BSENT;
  77                         cmd.parm.length = len;
  78                         card->interface.statcallb(&cmd);
  79                 } else
  80                         card->sndcount[ch] = 0;
  81         }
  82 }
  83
  84 /*
  85  * Send/Receive Data to/from the B-Channel.
  86  * This routine is called via timer-callback.
  87  * It schedules itself while any B-Channel is open.
  88  *
  89  * Parameter:
  90  *   data = pointer to card struct, set by kernel timer.data
  91  */
  92 static void
  93 isdnloop_pollbchan(struct timer_list *t)
  94 {
  95         isdnloop_card *card = from_timer(card, t, rb_timer);
  96         unsigned long flags;
  97
  98         if (card->flags & ISDNLOOP_FLAGS_B1ACTIVE)
  99                 isdnloop_bchan_send(card, 0);
 100         if (card->flags & ISDNLOOP_FLAGS_B2ACTIVE)
 101                 isdnloop_bchan_send(card, 1);
 102         if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE)) {
 103                 /* schedule b-channel polling again */
 104                 spin_lock_irqsave(&card->isdnloop_lock, flags);
 105                 card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
 106                 add_timer(&card->rb_timer);
 107                 card->flags |= ISDNLOOP_FLAGS_RBTIMER;
 108                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 109         } else
 110                 card->flags &= ~ISDNLOOP_FLAGS_RBTIMER;
 111 }
 112
 113 /*
 114  * Parse ICN-type setup string and fill fields of setup-struct
 115  * with parsed data.
 116  *
 117  * Parameter:
 118  *   setup = setup string, format: [caller-id],si1,si2,[called-id]
 119  *   cmd   = pointer to struct to be filled.
 120  */
 121 static void
 122 isdnloop_parse_setup(char *setup, isdn_ctrl *cmd)
 123 {
 124         char *t = setup;
 125         char *s = strchr(t, ',');
 126
 127         *s++ = '\0';
 128         strlcpy(cmd->parm.setup.phone, t, sizeof(cmd->parm.setup.phone));
 129         s = strchr(t = s, ',');
 130         *s++ = '\0';
 131         if (!strlen(t))
 132                 cmd->parm.setup.si1 = 0;
 133         else
 134                 cmd->parm.setup.si1 = simple_strtoul(t, NULL, 10);
 135         s = strchr(t = s, ',');
 136         *s++ = '\0';
 137         if (!strlen(t))
 138                 cmd->parm.setup.si2 = 0;
 139         else
 140                 cmd->parm.setup.si2 =
 141                         simple_strtoul(t, NULL, 10);
 142         strlcpy(cmd->parm.setup.eazmsn, s, sizeof(cmd->parm.setup.eazmsn));
 143         cmd->parm.setup.plan = 0;
 144         cmd->parm.setup.screen = 0;
 145 }
 146
 147 typedef struct isdnloop_stat {
 148         char *statstr;
 149         int command;
 150         int action;
 151 } isdnloop_stat;
 152 /* *INDENT-OFF* */
 153 static isdnloop_stat isdnloop_stat_table[] = {
 154         {"BCON_",          ISDN_STAT_BCONN, 1}, /* B-Channel connected        */
 155         {"BDIS_",          ISDN_STAT_BHUP,  2}, /* B-Channel disconnected     */
 156         {"DCON_",          ISDN_STAT_DCONN, 0}, /* D-Channel connected        */
 157         {"DDIS_",          ISDN_STAT_DHUP,  0}, /* D-Channel disconnected     */
 158         {"DCAL_I",         ISDN_STAT_ICALL, 3}, /* Incoming call dialup-line  */
 159         {"DSCA_I",         ISDN_STAT_ICALL, 3}, /* Incoming call 1TR6-SPV     */
 160         {"FCALL",          ISDN_STAT_ICALL, 4}, /* Leased line connection up  */
 161         {"CIF",            ISDN_STAT_CINF,  5}, /* Charge-info, 1TR6-type     */
 162         {"AOC",            ISDN_STAT_CINF,  6}, /* Charge-info, DSS1-type     */
 163         {"CAU",            ISDN_STAT_CAUSE, 7}, /* Cause code                 */
 164         {"TEI OK",         ISDN_STAT_RUN,   0}, /* Card connected to wallplug */
 165         {"E_L1: ACT FAIL", ISDN_STAT_BHUP,  8}, /* Layer-1 activation failed  */
 166         {"E_L2: DATA LIN", ISDN_STAT_BHUP,  8}, /* Layer-2 data link lost     */
 167         {"E_L1: ACTIVATION FAILED",
 168          ISDN_STAT_BHUP,  8},         /* Layer-1 activation failed  */
 169         {NULL, 0, -1}
 170 };
 171 /* *INDENT-ON* */
 172
 173
 174 /*
 175  * Parse Status message-strings from virtual card.
 176  * Depending on status, call statcallb for sending messages to upper
 177  * levels. Also set/reset B-Channel active-flags.
 178  *
 179  * Parameter:
 180  *   status  = status string to parse.
 181  *   channel = channel where message comes from.
 182  *   card    = card where message comes from.
 183  */
 184 static void
 185 isdnloop_parse_status(u_char *status, int channel, isdnloop_card *card)
 186 {
 187         isdnloop_stat *s = isdnloop_stat_table;
 188         int action = -1;
 189         isdn_ctrl cmd;
 190
 191         while (s->statstr) {
 192                 if (!strncmp(status, s->statstr, strlen(s->statstr))) {
 193                         cmd.command = s->command;
 194                         action = s->action;
 195                         break;
 196                 }
 197                 s++;
 198         }
 199         if (action == -1)
 200                 return;
 201         cmd.driver = card->myid;
 202         cmd.arg = channel;
 203         switch (action) {
 204         case 1:
 205                 /* BCON_x */
 206                 card->flags |= (channel) ?
 207                         ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE;
 208                 break;
 209         case 2:
 210                 /* BDIS_x */
 211                 card->flags &= ~((channel) ?
 212                                  ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE);
 213                 isdnloop_free_queue(card, channel);
 214                 break;
 215         case 3:
 216                 /* DCAL_I and DSCA_I */
 217                 isdnloop_parse_setup(status + 6, &cmd);
 218                 break;
 219         case 4:
 220                 /* FCALL */
 221                 sprintf(cmd.parm.setup.phone, "LEASED%d", card->myid);
 222                 sprintf(cmd.parm.setup.eazmsn, "%d", channel + 1);
 223                 cmd.parm.setup.si1 = 7;
 224                 cmd.parm.setup.si2 = 0;
 225                 cmd.parm.setup.plan = 0;
 226                 cmd.parm.setup.screen = 0;
 227                 break;
 228         case 5:
 229                 /* CIF */
 230                 strlcpy(cmd.parm.num, status + 3, sizeof(cmd.parm.num));
 231                 break;
 232         case 6:
 233                 /* AOC */
 234                 snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%d",
 235                          (int) simple_strtoul(status + 7, NULL, 16));
 236                 break;
 237         case 7:
 238                 /* CAU */
 239                 status += 3;
 240                 if (strlen(status) == 4)
 241                         snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%s%c%c",
 242                                  status + 2, *status, *(status + 1));
 243                 else
 244                         strlcpy(cmd.parm.num, status + 1, sizeof(cmd.parm.num));
 245                 break;
 246         case 8:
 247                 /* Misc Errors on L1 and L2 */
 248                 card->flags &= ~ISDNLOOP_FLAGS_B1ACTIVE;
 249                 isdnloop_free_queue(card, 0);
 250                 cmd.arg = 0;
 251                 cmd.driver = card->myid;
 252                 card->interface.statcallb(&cmd);
 253                 cmd.command = ISDN_STAT_DHUP;
 254                 cmd.arg = 0;
 255                 cmd.driver = card->myid;
 256                 card->interface.statcallb(&cmd);
 257                 cmd.command = ISDN_STAT_BHUP;
 258                 card->flags &= ~ISDNLOOP_FLAGS_B2ACTIVE;
 259                 isdnloop_free_queue(card, 1);
 260                 cmd.arg = 1;
 261                 cmd.driver = card->myid;
 262                 card->interface.statcallb(&cmd);
 263                 cmd.command = ISDN_STAT_DHUP;
 264                 cmd.arg = 1;
 265                 cmd.driver = card->myid;
 266                 break;
 267         }
 268         card->interface.statcallb(&cmd);
 269 }
 270
 271 /*
 272  * Store a cwcharacter into ringbuffer for reading from /dev/isdnctrl
 273  *
 274  * Parameter:
 275  *   card = pointer to card struct.
 276  *   c    = char to store.
 277  */
 278 static void
 279 isdnloop_putmsg(isdnloop_card *card, unsigned char c)
 280 {
 281         ulong flags;
 282
 283         spin_lock_irqsave(&card->isdnloop_lock, flags);
 284         *card->msg_buf_write++ = (c == 0xff) ? '\n' : c;
 285         if (card->msg_buf_write == card->msg_buf_read) {
 286                 if (++card->msg_buf_read > card->msg_buf_end)
 287                         card->msg_buf_read = card->msg_buf;
 288         }
 289         if (card->msg_buf_write > card->msg_buf_end)
 290                 card->msg_buf_write = card->msg_buf;
 291         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 292 }
 293
 294 /*
 295  * Poll a virtual cards message queue.
 296  * If there are new status-replies from the card, copy them to
 297  * ringbuffer for reading on /dev/isdnctrl and call
 298  * isdnloop_parse_status() for processing them. Watch for special
 299  * Firmware bootmessage and parse it, to get the D-Channel protocol.
 300  * If there are B-Channels open, initiate a timer-callback to
 301  * isdnloop_pollbchan().
 302  * This routine is called periodically via timer interrupt.
 303  *
 304  * Parameter:
 305  *   data = pointer to card struct
 306  */
 307 static void
 308 isdnloop_polldchan(struct timer_list *t)
 309 {
 310         isdnloop_card *card = from_timer(card, t, st_timer);
 311         struct sk_buff *skb;
 312         int avail;
 313         int left;
 314         u_char c;
 315         int ch;
 316         unsigned long flags;
 317         u_char *p;
 318         isdn_ctrl cmd;
 319
 320         skb = skb_dequeue(&card->dqueue);
 321         if (skb)
 322                 avail = skb->len;
 323         else
 324                 avail = 0;
 325         for (left = avail; left > 0; left--) {
 326                 c = *skb->data;
 327                 skb_pull(skb, 1);
 328                 isdnloop_putmsg(card, c);
 329                 card->imsg[card->iptr] = c;
 330                 if (card->iptr < 59)
 331                         card->iptr++;
 332                 if (!skb->len) {
 333                         avail++;
 334                         isdnloop_putmsg(card, '\n');
 335                         card->imsg[card->iptr] = 0;
 336                         card->iptr = 0;
 337                         if (card->imsg[0] == '0' && card->imsg[1] >= '0' &&
 338                             card->imsg[1] <= '2' && card->imsg[2] == ';') {
 339                                 ch = (card->imsg[1] - '0') - 1;
 340                                 p = &card->imsg[3];
 341                                 isdnloop_parse_status(p, ch, card);
 342                         } else {
 343                                 p = card->imsg;
 344                                 if (!strncmp(p, "DRV1.", 5)) {
 345                                         printk(KERN_INFO "isdnloop: (%s) %s\n", CID, p);
 346                                         if (!strncmp(p + 7, "TC", 2)) {
 347                                                 card->ptype = ISDN_PTYPE_1TR6;
 348                                                 card->interface.features |= ISDN_FEATURE_P_1TR6;
 349                                                 printk(KERN_INFO
 350                                                        "isdnloop: (%s) 1TR6-Protocol loaded and running\n", CID);
 351                                         }
 352                                         if (!strncmp(p + 7, "EC", 2)) {
 353                                                 card->ptype = ISDN_PTYPE_EURO;
 354                                                 card->interface.features |= ISDN_FEATURE_P_EURO;
 355                                                 printk(KERN_INFO
 356                                                        "isdnloop: (%s) Euro-Protocol loaded and running\n", CID);
 357                                         }
 358                                         continue;
 359
 360                                 }
 361                         }
 362                 }
 363         }
 364         if (avail) {
 365                 cmd.command = ISDN_STAT_STAVAIL;
 366                 cmd.driver = card->myid;
 367                 cmd.arg = avail;
 368                 card->interface.statcallb(&cmd);
 369         }
 370         if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE))
 371                 if (!(card->flags & ISDNLOOP_FLAGS_RBTIMER)) {
 372                         /* schedule b-channel polling */
 373                         card->flags |= ISDNLOOP_FLAGS_RBTIMER;
 374                         spin_lock_irqsave(&card->isdnloop_lock, flags);
 375                         del_timer(&card->rb_timer);
 376                         card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
 377                         add_timer(&card->rb_timer);
 378                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 379                 }
 380         /* schedule again */
 381         spin_lock_irqsave(&card->isdnloop_lock, flags);
 382         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
 383         add_timer(&card->st_timer);
 384         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 385 }
 386
 387 /*
 388  * Append a packet to the transmit buffer-queue.
 389  *
 390  * Parameter:
 391  *   channel = Number of B-channel
 392  *   skb     = packet to send.
 393  *   card    = pointer to card-struct
 394  * Return:
 395  *   Number of bytes transferred, -E??? on error
 396  */
 397 static int
 398 isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card *card)
 399 {
 400         int len = skb->len;
 401         unsigned long flags;
 402         struct sk_buff *nskb;
 403
 404         if (len > 4000) {
 405                 printk(KERN_WARNING
 406                        "isdnloop: Send packet too large\n");
 407                 return -EINVAL;
 408         }
 409         if (len) {
 410                 if (!(card->flags & (channel ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE)))
 411                         return 0;
 412                 if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
 413                         return 0;
 414                 spin_lock_irqsave(&card->isdnloop_lock, flags);
 415                 nskb = dev_alloc_skb(skb->len);
 416                 if (nskb) {
 417                         skb_copy_from_linear_data(skb,
 418                                                   skb_put(nskb, len), len);
 419                         skb_queue_tail(&card->bqueue[channel], nskb);
 420                         dev_kfree_skb(skb);
 421                 } else
 422                         len = 0;
 423                 card->sndcount[channel] += len;
 424                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 425         }
 426         return len;
 427 }
 428
 429 /*
 430  * Read the messages from the card's ringbuffer
 431  *
 432  * Parameter:
 433  *   buf  = pointer to buffer.
 434  *   len  = number of bytes to read.
 435  *   user = flag, 1: called from userlevel 0: called from kernel.
 436  *   card = pointer to card struct.
 437  * Return:
 438  *   number of bytes actually transferred.
 439  */
 440 static int
 441 isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card *card)
 442 {
 443         int count;
 444         u_char __user *p;
 445
 446         for (p = buf, count = 0; count < len; p++, count++) {
 447                 if (card->msg_buf_read == card->msg_buf_write)
 448                         return count;
 449                 if (put_user(*card->msg_buf_read++, p))
 450                         return -EFAULT;
 451                 if (card->msg_buf_read > card->msg_buf_end)
 452                         card->msg_buf_read = card->msg_buf;
 453         }
 454         return count;
 455 }
 456
 457 /*
 458  * Simulate a card's response by appending it to the cards
 459  * message queue.
 460  *
 461  * Parameter:
 462  *   card = pointer to card struct.
 463  *   s    = pointer to message-string.
 464  *   ch   = channel: 0 = generic messages, 1 and 2 = D-channel messages.
 465  * Return:
 466  *   0 on success, 1 on memory squeeze.
 467  */
 468 static int
 469 isdnloop_fake(isdnloop_card *card, char *s, int ch)
 470 {
 471         struct sk_buff *skb;
 472         int len = strlen(s) + ((ch >= 0) ? 3 : 0);
 473         skb = dev_alloc_skb(len);
 474         if (!skb) {
 475                 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
 476                 return 1;
 477         }
 478         if (ch >= 0)
 479                 sprintf(skb_put(skb, 3), "%02d;", ch);
 480         skb_put_data(skb, s, strlen(s));
 481         skb_queue_tail(&card->dqueue, skb);
 482         return 0;
 483 }
 484 /* *INDENT-OFF* */
 485 static isdnloop_stat isdnloop_cmd_table[] = {
 486         {"BCON_R",         0,  1},      /* B-Channel connect        */
 487         {"BCON_I",         0, 17},      /* B-Channel connect ind    */
 488         {"BDIS_R",         0,  2},      /* B-Channel disconnect     */
 489         {"DDIS_R",         0,  3},      /* D-Channel disconnect     */
 490         {"DCON_R",         0, 16},      /* D-Channel connect        */
 491         {"DSCA_R",         0,  4},      /* Dial 1TR6-SPV     */
 492         {"DCAL_R",         0,  5},      /* Dial */
 493         {"EAZC",           0,  6},      /* Clear EAZ listener */
 494         {"EAZ",            0,  7},      /* Set EAZ listener */
 495         {"SEEAZ",          0,  8},      /* Get EAZ listener */
 496         {"MSN",            0,  9},      /* Set/Clear MSN listener */
 497         {"MSALL",          0, 10},      /* Set multi MSN listeners */
 498         {"SETSIL",         0, 11},      /* Set SI list     */
 499         {"SEESIL",         0, 12},      /* Get SI list     */
 500         {"SILC",           0, 13},      /* Clear SI list     */
 501         {"LOCK",           0, -1},      /* LOCK channel     */
 502         {"UNLOCK",         0, -1},      /* UNLOCK channel     */
 503         {"FV2ON",          1, 14},      /* Leased mode on               */
 504         {"FV2OFF",         1, 15},      /* Leased mode off              */
 505         {NULL, 0, -1}
 506 };
 507 /* *INDENT-ON* */
 508
 509
 510 /*
 511  * Simulate an error-response from a card.
 512  *
 513  * Parameter:
 514  *   card = pointer to card struct.
 515  */
 516 static void
 517 isdnloop_fake_err(isdnloop_card *card)
 518 {
 519         char buf[64];
 520
 521         snprintf(buf, sizeof(buf), "E%s", card->omsg);
 522         isdnloop_fake(card, buf, -1);
 523         isdnloop_fake(card, "NAK", -1);
 524 }
 525
 526 static u_char ctable_eu[] = {0x00, 0x11, 0x01, 0x12};
 527 static u_char ctable_1t[] = {0x00, 0x3b, 0x01, 0x3a};
 528
 529 /*
 530  * Assemble a simplified cause message depending on the
 531  * D-channel protocol used.
 532  *
 533  * Parameter:
 534  *   card = pointer to card struct.
 535  *   loc  = location: 0 = local, 1 = remote.
 536  *   cau  = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
 537  * Return:
 538  *   Pointer to buffer containing the assembled message.
 539  */
 540 static char *
 541 isdnloop_unicause(isdnloop_card *card, int loc, int cau)
 542 {
 543         static char buf[6];
 544
 545         switch (card->ptype) {
 546         case ISDN_PTYPE_EURO:
 547                 sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
 548                 break;
 549         case ISDN_PTYPE_1TR6:
 550                 sprintf(buf, "%02X44", ctable_1t[cau]);
 551                 break;
 552         default:
 553                 return "0000";
 554         }
 555         return buf;
 556 }
 557
 558 /*
 559  * Release a virtual connection. Called from timer interrupt, when
 560  * called party did not respond.
 561  *
 562  * Parameter:
 563  *   card = pointer to card struct.
 564  *   ch   = channel (0-based)
 565  */
 566 static void
 567 isdnloop_atimeout(isdnloop_card *card, int ch)
 568 {
 569         unsigned long flags;
 570         char buf[60];
 571
 572         spin_lock_irqsave(&card->isdnloop_lock, flags);
 573         if (card->rcard) {
 574                 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
 575                 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
 576                 card->rcard[ch] = NULL;
 577         }
 578         isdnloop_fake(card, "DDIS_I", ch + 1);
 579         /* No user responding */
 580         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
 581         isdnloop_fake(card, buf, ch + 1);
 582         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 583 }
 584
 585 /*
 586  * Wrapper for isdnloop_atimeout().
 587  */
 588 static void
 589 isdnloop_atimeout0(struct timer_list *t)
 590 {
 591         isdnloop_card *card = from_timer(card, t, c_timer[0]);
 592
 593         isdnloop_atimeout(card, 0);
 594 }
 595
 596 /*
 597  * Wrapper for isdnloop_atimeout().
 598  */
 599 static void
 600 isdnloop_atimeout1(struct timer_list *t)
 601 {
 602         isdnloop_card *card = from_timer(card, t, c_timer[1]);
 603
 604         isdnloop_atimeout(card, 1);
 605 }
 606
 607 /*
 608  * Install a watchdog for a user, not responding.
 609  *
 610  * Parameter:
 611  *   card = pointer to card struct.
 612  *   ch   = channel to watch for.
 613  */
 614 static void
 615 isdnloop_start_ctimer(isdnloop_card *card, int ch)
 616 {
 617         unsigned long flags;
 618
 619         spin_lock_irqsave(&card->isdnloop_lock, flags);
 620         timer_setup(&card->c_timer[ch], ch ? isdnloop_atimeout1
 621                                            : isdnloop_atimeout0, 0);
 622         card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
 623         add_timer(&card->c_timer[ch]);
 624         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 625 }
 626
 627 /*
 628  * Kill a pending channel watchdog.
 629  *
 630  * Parameter:
 631  *   card = pointer to card struct.
 632  *   ch   = channel (0-based).
 633  */
 634 static void
 635 isdnloop_kill_ctimer(isdnloop_card *card, int ch)
 636 {
 637         unsigned long flags;
 638
 639         spin_lock_irqsave(&card->isdnloop_lock, flags);
 640         del_timer(&card->c_timer[ch]);
 641         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 642 }
 643
 644 static u_char si2bit[] = {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
 645 static u_char bit2si[] = {1, 5, 7};
 646
 647 /*
 648  * Try finding a listener for an outgoing call.
 649  *
 650  * Parameter:
 651  *   card = pointer to calling card.
 652  *   p    = pointer to ICN-type setup-string.
 653  *   lch  = channel of calling card.
 654  *   cmd  = pointer to struct to be filled when parsing setup.
 655  * Return:
 656  *   0 = found match, alerting should happen.
 657  *   1 = found matching number but it is busy.
 658  *   2 = no matching listener.
 659  *   3 = found matching number but SI does not match.
 660  */
 661 static int
 662 isdnloop_try_call(isdnloop_card *card, char *p, int lch, isdn_ctrl *cmd)
 663 {
 664         isdnloop_card *cc = cards;
 665         unsigned long flags;
 666         int ch;
 667         int num_match;
 668         int i;
 669         char *e;
 670         char nbuf[32];
 671
 672         isdnloop_parse_setup(p, cmd);
 673         while (cc) {
 674                 for (ch = 0; ch < 2; ch++) {
 675                         /* Exclude ourself */
 676                         if ((cc == card) && (ch == lch))
 677                                 continue;
 678                         num_match = 0;
 679                         switch (cc->ptype) {
 680                         case ISDN_PTYPE_EURO:
 681                                 for (i = 0; i < 3; i++)
 682                                         if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
 683                                                 num_match = 1;
 684                                 break;
 685                         case ISDN_PTYPE_1TR6:
 686                                 e = cc->eazlist[ch];
 687                                 while (*e) {
 688                                         sprintf(nbuf, "%s%c", cc->s0num[0], *e);
 689                                         if (!(strcmp(nbuf, cmd->parm.setup.phone)))
 690                                                 num_match = 1;
 691                                         e++;
 692                                 }
 693                         }
 694                         if (num_match) {
 695                                 spin_lock_irqsave(&card->isdnloop_lock, flags);
 696                                 /* channel idle? */
 697                                 if (!(cc->rcard[ch])) {
 698                                         /* Check SI */
 699                                         if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
 700                                                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 701                                                 return 3;
 702                                         }
 703                                         /* ch is idle, si and number matches */
 704                                         cc->rcard[ch] = card;
 705                                         cc->rch[ch] = lch;
 706                                         card->rcard[lch] = cc;
 707                                         card->rch[lch] = ch;
 708                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 709                                         return 0;
 710                                 } else {
 711                                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
 712                                         /* num matches, but busy */
 713                                         if (ch == 1)
 714                                                 return 1;
 715                                 }
 716                         }
 717                 }
 718                 cc = cc->next;
 719         }
 720         return 2;
 721 }
 722
 723 /*
 724  * Depending on D-channel protocol and caller/called, modify
 725  * phone number.
 726  *
 727  * Parameter:
 728  *   card   = pointer to card struct.
 729  *   phone  = pointer phone number.
 730  *   caller = flag: 1 = caller, 0 = called.
 731  * Return:
 732  *   pointer to new phone number.
 733  */
 734 static char *
 735 isdnloop_vstphone(isdnloop_card *card, char *phone, int caller)
 736 {
 737         int i;
 738         static char nphone[30];
 739
 740         if (!card) {
 741                 printk("BUG!!!\n");
 742                 return "";
 743         }
 744         switch (card->ptype) {
 745         case ISDN_PTYPE_EURO:
 746                 if (caller) {
 747                         for (i = 0; i < 2; i++)
 748                                 if (!(strcmp(card->s0num[i], phone)))
 749                                         return phone;
 750                         return card->s0num[0];
 751                 }
 752                 return phone;
 753                 break;
 754         case ISDN_PTYPE_1TR6:
 755                 if (caller) {
 756                         sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
 757                         return nphone;
 758                 } else
 759                         return &phone[strlen(phone) - 1];
 760                 break;
 761         }
 762         return "";
 763 }
 764
 765 /*
 766  * Parse an ICN-type command string sent to the 'card'.
 767  * Perform misc. actions depending on the command.
 768  *
 769  * Parameter:
 770  *   card = pointer to card struct.
 771  */
 772 static void
 773 isdnloop_parse_cmd(isdnloop_card *card)
 774 {
 775         char *p = card->omsg;
 776         isdn_ctrl cmd;
 777         char buf[60];
 778         isdnloop_stat *s = isdnloop_cmd_table;
 779         int action = -1;
 780         int i;
 781         int ch;
 782
 783         if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
 784                 isdnloop_fake_err(card);
 785                 return;
 786         }
 787         ch = card->omsg[1] - '0';
 788         if ((ch < 0) || (ch > 2)) {
 789                 isdnloop_fake_err(card);
 790                 return;
 791         }
 792         p += 3;
 793         while (s->statstr) {
 794                 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
 795                         action = s->action;
 796                         if (s->command && (ch != 0)) {
 797                                 isdnloop_fake_err(card);
 798                                 return;
 799                         }
 800                         break;
 801                 }
 802                 s++;
 803         }
 804         if (action == -1)
 805                 return;
 806         switch (action) {
 807         case 1:
 808                 /* 0x;BCON_R */
 809                 if (card->rcard[ch - 1]) {
 810                         isdnloop_fake(card->rcard[ch - 1], "BCON_I",
 811                                       card->rch[ch - 1] + 1);
 812                         isdnloop_fake(card, "BCON_C", ch);
 813                 }
 814                 break;
 815         case 17:
 816                 /* 0x;BCON_I */
 817                 if (card->rcard[ch - 1]) {
 818                         isdnloop_fake(card->rcard[ch - 1], "BCON_C",
 819                                       card->rch[ch - 1] + 1);
 820                 }
 821                 break;
 822         case 2:
 823                 /* 0x;BDIS_R */
 824                 isdnloop_fake(card, "BDIS_C", ch);
 825                 if (card->rcard[ch - 1]) {
 826                         isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
 827                                       card->rch[ch - 1] + 1);
 828                 }
 829                 break;
 830         case 16:
 831                 /* 0x;DCON_R */
 832                 isdnloop_kill_ctimer(card, ch - 1);
 833                 if (card->rcard[ch - 1]) {
 834                         isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
 835                         isdnloop_fake(card->rcard[ch - 1], "DCON_C",
 836                                       card->rch[ch - 1] + 1);
 837                         isdnloop_fake(card, "DCON_C", ch);
 838                 }
 839                 break;
 840         case 3:
 841                 /* 0x;DDIS_R */
 842                 isdnloop_kill_ctimer(card, ch - 1);
 843                 if (card->rcard[ch - 1]) {
 844                         isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
 845                         isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
 846                                       card->rch[ch - 1] + 1);
 847                         card->rcard[ch - 1] = NULL;
 848                 }
 849                 isdnloop_fake(card, "DDIS_C", ch);
 850                 break;
 851         case 4:
 852                 /* 0x;DSCA_Rdd,yy,zz,oo */
 853                 if (card->ptype != ISDN_PTYPE_1TR6) {
 854                         isdnloop_fake_err(card);
 855                         return;
 856                 }
 857                 /* Fall through */
 858         case 5:
 859                 /* 0x;DCAL_Rdd,yy,zz,oo */
 860                 p += 6;
 861                 switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
 862                 case 0:
 863                         /* Alerting */
 864                         sprintf(buf, "D%s_I%s,%02d,%02d,%s",
 865                                 (action == 4) ? "SCA" : "CAL",
 866                                 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
 867                                 cmd.parm.setup.si1,
 868                                 cmd.parm.setup.si2,
 869                                 isdnloop_vstphone(card->rcard[ch - 1],
 870                                                   cmd.parm.setup.phone, 0));
 871                         isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
 872                         /* Fall through */
 873                 case 3:
 874                         /* si1 does not match, don't alert but start timer */
 875                         isdnloop_start_ctimer(card, ch - 1);
 876                         break;
 877                 case 1:
 878                         /* Remote busy */
 879                         isdnloop_fake(card, "DDIS_I", ch);
 880                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
 881                         isdnloop_fake(card, buf, ch);
 882                         break;
 883                 case 2:
 884                         /* No such user */
 885                         isdnloop_fake(card, "DDIS_I", ch);
 886                         sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
 887                         isdnloop_fake(card, buf, ch);
 888                         break;
 889                 }
 890                 break;
 891         case 6:
 892                 /* 0x;EAZC */
 893                 card->eazlist[ch - 1][0] = '\0';
 894                 break;
 895         case 7:
 896                 /* 0x;EAZ */
 897                 p += 3;
 898                 if (strlen(p) >= sizeof(card->eazlist[0]))
 899                         break;
 900                 strcpy(card->eazlist[ch - 1], p);
 901                 break;
 902         case 8:
 903                 /* 0x;SEEAZ */
 904                 sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
 905                 isdnloop_fake(card, buf, ch + 1);
 906                 break;
 907         case 9:
 908                 /* 0x;MSN */
 909                 break;
 910         case 10:
 911                 /* 0x;MSNALL */
 912                 break;
 913         case 11:
 914                 /* 0x;SETSIL */
 915                 p += 6;
 916                 i = 0;
 917                 while (strchr("0157", *p)) {
 918                         if (i)
 919                                 card->sil[ch - 1] |= si2bit[*p - '0'];
 920                         i = (*p++ == '0');
 921                 }
 922                 if (*p)
 923                         isdnloop_fake_err(card);
 924                 break;
 925         case 12:
 926                 /* 0x;SEESIL */
 927                 sprintf(buf, "SIN-LIST: ");
 928                 p = buf + 10;
 929                 for (i = 0; i < 3; i++)
 930                         if (card->sil[ch - 1] & (1 << i))
 931                                 p += sprintf(p, "%02d", bit2si[i]);
 932                 isdnloop_fake(card, buf, ch + 1);
 933                 break;
 934         case 13:
 935                 /* 0x;SILC */
 936                 card->sil[ch - 1] = 0;
 937                 break;
 938         case 14:
 939                 /* 00;FV2ON */
 940                 break;
 941         case 15:
 942                 /* 00;FV2OFF */
 943                 break;
 944         }
 945 }
 946
 947 /*
 948  * Put command-strings into the of the 'card'. In reality, execute them
 949  * right in place by calling isdnloop_parse_cmd(). Also copy every
 950  * command to the read message ringbuffer, preceding it with a '>'.
 951  * These mesagges can be read at /dev/isdnctrl.
 952  *
 953  * Parameter:
 954  *   buf  = pointer to command buffer.
 955  *   len  = length of buffer data.
 956  *   user = flag: 1 = called form userlevel, 0 called from kernel.
 957  *   card = pointer to card struct.
 958  * Return:
 959  *   number of bytes transferred (currently always equals len).
 960  */
 961 static int
 962 isdnloop_writecmd(const u_char *buf, int len, int user, isdnloop_card *card)
 963 {
 964         int xcount = 0;
 965         int ocount = 1;
 966         isdn_ctrl cmd;
 967
 968         while (len) {
 969                 int count = len;
 970                 u_char *p;
 971                 u_char msg[0x100];
 972
 973                 if (count > 255)
 974                         count = 255;
 975                 if (user) {
 976                         if (copy_from_user(msg, buf, count))
 977                                 return -EFAULT;
 978                 } else
 979                         memcpy(msg, buf, count);
 980                 isdnloop_putmsg(card, '>');
 981                 for (p = msg; count > 0; count--, p++) {
 982                         len--;
 983                         xcount++;
 984                         isdnloop_putmsg(card, *p);
 985                         card->omsg[card->optr] = *p;
 986                         if (*p == '\n') {
 987                                 card->omsg[card->optr] = '\0';
 988                                 card->optr = 0;
 989                                 isdnloop_parse_cmd(card);
 990                                 if (len) {
 991                                         isdnloop_putmsg(card, '>');
 992                                         ocount++;
 993                                 }
 994                         } else {
 995                                 if (card->optr < 59)
 996                                         card->optr++;
 997                         }
 998                         ocount++;
 999                 }
1000         }
1001         cmd.command = ISDN_STAT_STAVAIL;
1002         cmd.driver = card->myid;
1003         cmd.arg = ocount;
1004         card->interface.statcallb(&cmd);
1005         return xcount;
1006 }
1007
1008 /*
1009  * Delete card's pending timers, send STOP to linklevel
1010  */
1011 static void
1012 isdnloop_stopcard(isdnloop_card *card)
1013 {
1014         unsigned long flags;
1015         isdn_ctrl cmd;
1016
1017         spin_lock_irqsave(&card->isdnloop_lock, flags);
1018         if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1019                 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1020                 del_timer(&card->st_timer);
1021                 del_timer(&card->rb_timer);
1022                 del_timer(&card->c_timer[0]);
1023                 del_timer(&card->c_timer[1]);
1024                 cmd.command = ISDN_STAT_STOP;
1025                 cmd.driver = card->myid;
1026                 card->interface.statcallb(&cmd);
1027         }
1028         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1029 }
1030
1031 /*
1032  * Stop all cards before unload.
1033  */
1034 static void
1035 isdnloop_stopallcards(void)
1036 {
1037         isdnloop_card *p = cards;
1038
1039         while (p) {
1040                 isdnloop_stopcard(p);
1041                 p = p->next;
1042         }
1043 }
1044
1045 /*
1046  * Start a 'card'. Simulate card's boot message and set the phone
1047  * number(s) of the virtual 'S0-Interface'. Install D-channel
1048  * poll timer.
1049  *
1050  * Parameter:
1051  *   card  = pointer to card struct.
1052  *   sdefp = pointer to struct holding ioctl parameters.
1053  * Return:
1054  *   0 on success, -E??? otherwise.
1055  */
1056 static int
1057 isdnloop_start(isdnloop_card *card, isdnloop_sdef *sdefp)
1058 {
1059         unsigned long flags;
1060         isdnloop_sdef sdef;
1061         int i;
1062
1063         if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1064                 return -EBUSY;
1065         if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1066                 return -EFAULT;
1067
1068         for (i = 0; i < 3; i++) {
1069                 if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i])))
1070                         return -EINVAL;
1071         }
1072
1073         spin_lock_irqsave(&card->isdnloop_lock, flags);
1074         switch (sdef.ptype) {
1075         case ISDN_PTYPE_EURO:
1076                 if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1077                                   -1)) {
1078                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1079                         return -ENOMEM;
1080                 }
1081                 card->sil[0] = card->sil[1] = 4;
1082                 if (isdnloop_fake(card, "TEI OK", 0)) {
1083                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1084                         return -ENOMEM;
1085                 }
1086                 for (i = 0; i < 3; i++) {
1087                         strlcpy(card->s0num[i], sdef.num[i],
1088                                 sizeof(card->s0num[0]));
1089                 }
1090                 break;
1091         case ISDN_PTYPE_1TR6:
1092                 if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1093                                   -1)) {
1094                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1095                         return -ENOMEM;
1096                 }
1097                 card->sil[0] = card->sil[1] = 4;
1098                 if (isdnloop_fake(card, "TEI OK", 0)) {
1099                         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1100                         return -ENOMEM;
1101                 }
1102                 strlcpy(card->s0num[0], sdef.num[0], sizeof(card->s0num[0]));
1103                 card->s0num[1][0] = '\0';
1104                 card->s0num[2][0] = '\0';
1105                 break;
1106         default:
1107                 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1108                 printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1109                        sdef.ptype);
1110                 return -EINVAL;
1111         }
1112         timer_setup(&card->rb_timer, isdnloop_pollbchan, 0);
1113         timer_setup(&card->st_timer, isdnloop_polldchan, 0);
1114         card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1115         add_timer(&card->st_timer);
1116         card->flags |= ISDNLOOP_FLAGS_RUNNING;
1117         spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1118         return 0;
1119 }
1120
1121 /*
1122  * Main handler for commands sent by linklevel.
1123  */
1124 static int
1125 isdnloop_command(isdn_ctrl *c, isdnloop_card *card)
1126 {
1127         ulong a;
1128         int i;
1129         char cbuf[80];
1130         isdn_ctrl cmd;
1131         isdnloop_cdef cdef;
1132
1133         switch (c->command) {
1134         case ISDN_CMD_IOCTL:
1135                 memcpy(&a, c->parm.num, sizeof(ulong));
1136                 switch (c->arg) {
1137                 case ISDNLOOP_IOCTL_DEBUGVAR:
1138                         return (ulong) card;
1139                 case ISDNLOOP_IOCTL_STARTUP:
1140                         return isdnloop_start(card, (isdnloop_sdef *) a);
1141                         break;
1142                 case ISDNLOOP_IOCTL_ADDCARD:
1143                         if (copy_from_user((char *)&cdef,
1144                                            (char *)a,
1145                                            sizeof(cdef)))
1146                                 return -EFAULT;
1147                         return isdnloop_addcard(cdef.id1);
1148                         break;
1149                 case ISDNLOOP_IOCTL_LEASEDCFG:
1150                         if (a) {
1151                                 if (!card->leased) {
1152                                         card->leased = 1;
1153                                         while (card->ptype == ISDN_PTYPE_UNKNOWN)
1154                                                 schedule_timeout_interruptible(10);
1155                                         schedule_timeout_interruptible(10);
1156                                         sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1157                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1158                                         printk(KERN_INFO
1159                                                "isdnloop: (%s) Leased-line mode enabled\n",
1160                                                CID);
1161                                         cmd.command = ISDN_STAT_RUN;
1162                                         cmd.driver = card->myid;
1163                                         cmd.arg = 0;
1164                                         card->interface.statcallb(&cmd);
1165                                 }
1166                         } else {
1167                                 if (card->leased) {
1168                                         card->leased = 0;
1169                                         sprintf(cbuf, "00;FV2OFF\n");
1170                                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1171                                         printk(KERN_INFO
1172                                                "isdnloop: (%s) Leased-line mode disabled\n",
1173                                                CID);
1174                                         cmd.command = ISDN_STAT_RUN;
1175                                         cmd.driver = card->myid;
1176                                         cmd.arg = 0;
1177                                         card->interface.statcallb(&cmd);
1178                                 }
1179                         }
1180                         return 0;
1181                 default:
1182                         return -EINVAL;
1183                 }
1184                 break;
1185         case ISDN_CMD_DIAL:
1186                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1187                         return -ENODEV;
1188                 if (card->leased)
1189                         break;
1190                 if ((c->arg & 255) < ISDNLOOP_BCH) {
1191                         char *p;
1192                         char dcode[4];
1193
1194                         a = c->arg;
1195                         p = c->parm.setup.phone;
1196                         if (*p == 's' || *p == 'S') {
1197                                 /* Dial for SPV */
1198                                 p++;
1199                                 strcpy(dcode, "SCA");
1200                         } else
1201                                 /* Normal Dial */
1202                                 strcpy(dcode, "CAL");
1203                         snprintf(cbuf, sizeof(cbuf),
1204                                  "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1205                                  dcode, p, c->parm.setup.si1,
1206                                  c->parm.setup.si2, c->parm.setup.eazmsn);
1207                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1208                 }
1209                 break;
1210         case ISDN_CMD_ACCEPTD:
1211                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1212                         return -ENODEV;
1213                 if (c->arg < ISDNLOOP_BCH) {
1214                         a = c->arg + 1;
1215                         cbuf[0] = 0;
1216                         switch (card->l2_proto[a - 1]) {
1217                         case ISDN_PROTO_L2_X75I:
1218                                 sprintf(cbuf, "%02d;BX75\n", (int) a);
1219                                 break;
1220 #ifdef CONFIG_ISDN_X25
1221                         case ISDN_PROTO_L2_X25DTE:
1222                                 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1223                                 break;
1224                         case ISDN_PROTO_L2_X25DCE:
1225                                 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1226                                 break;
1227 #endif
1228                         case ISDN_PROTO_L2_HDLC:
1229                                 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1230                                 break;
1231                         }
1232                         if (strlen(cbuf))
1233                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1234                         sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1235                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1236                 }
1237                 break;
1238         case ISDN_CMD_ACCEPTB:
1239                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1240                         return -ENODEV;
1241                 if (c->arg < ISDNLOOP_BCH) {
1242                         a = c->arg + 1;
1243                         switch (card->l2_proto[a - 1]) {
1244                         case ISDN_PROTO_L2_X75I:
1245                                 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1246                                 break;
1247 #ifdef CONFIG_ISDN_X25
1248                         case ISDN_PROTO_L2_X25DTE:
1249                                 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1250                                 break;
1251                         case ISDN_PROTO_L2_X25DCE:
1252                                 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1253                                 break;
1254 #endif
1255                         case ISDN_PROTO_L2_HDLC:
1256                                 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1257                                 break;
1258                         default:
1259                                 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1260                         }
1261                         printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1262                         i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1263                         break;
1264                 case ISDN_CMD_HANGUP:
1265                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1266                                 return -ENODEV;
1267                         if (c->arg < ISDNLOOP_BCH) {
1268                                 a = c->arg + 1;
1269                                 sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1270                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1271                         }
1272                         break;
1273                 case ISDN_CMD_SETEAZ:
1274                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1275                                 return -ENODEV;
1276                         if (card->leased)
1277                                 break;
1278                         if (c->arg < ISDNLOOP_BCH) {
1279                                 a = c->arg + 1;
1280                                 if (card->ptype == ISDN_PTYPE_EURO) {
1281                                         sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1282                                                 c->parm.num[0] ? "N" : "ALL", c->parm.num);
1283                                 } else
1284                                         sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1285                                                 c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1286                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1287                         }
1288                         break;
1289                 case ISDN_CMD_CLREAZ:
1290                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1291                                 return -ENODEV;
1292                         if (card->leased)
1293                                 break;
1294                         if (c->arg < ISDNLOOP_BCH) {
1295                                 a = c->arg + 1;
1296                                 if (card->ptype == ISDN_PTYPE_EURO)
1297                                         sprintf(cbuf, "%02d;MSNC\n", (int) a);
1298                                 else
1299                                         sprintf(cbuf, "%02d;EAZC\n", (int) a);
1300                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1301                         }
1302                         break;
1303                 case ISDN_CMD_SETL2:
1304                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1305                                 return -ENODEV;
1306                         if ((c->arg & 255) < ISDNLOOP_BCH) {
1307                                 a = c->arg;
1308                                 switch (a >> 8) {
1309                                 case ISDN_PROTO_L2_X75I:
1310                                         sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1311                                         break;
1312 #ifdef CONFIG_ISDN_X25
1313                                 case ISDN_PROTO_L2_X25DTE:
1314                                         sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1315                                         break;
1316                                 case ISDN_PROTO_L2_X25DCE:
1317                                         sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1318                                         break;
1319 #endif
1320                                 case ISDN_PROTO_L2_HDLC:
1321                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1322                                         break;
1323                                 case ISDN_PROTO_L2_TRANS:
1324                                         sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1325                                         break;
1326                                 default:
1327                                         return -EINVAL;
1328                                 }
1329                                 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1330                                 card->l2_proto[a & 255] = (a >> 8);
1331                         }
1332                         break;
1333                 case ISDN_CMD_SETL3:
1334                         if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1335                                 return -ENODEV;
1336                         return 0;
1337                 default:
1338                         return -EINVAL;
1339                 }
1340         }
1341         return 0;
1342 }
1343
1344 /*
1345  * Find card with given driverId
1346  */
1347 static inline isdnloop_card *
1348 isdnloop_findcard(int driverid)
1349 {
1350         isdnloop_card *p = cards;
1351
1352         while (p) {
1353                 if (p->myid == driverid)
1354                         return p;
1355                 p = p->next;
1356         }
1357         return (isdnloop_card *) 0;
1358 }
1359
1360 /*
1361  * Wrapper functions for interface to linklevel
1362  */
1363 static int
1364 if_command(isdn_ctrl *c)
1365 {
1366         isdnloop_card *card = isdnloop_findcard(c->driver);
1367
1368         if (card)
1369                 return isdnloop_command(c, card);
1370         printk(KERN_ERR
1371                "isdnloop: if_command called with invalid driverId!\n");
1372         return -ENODEV;
1373 }
1374
1375 static int
1376 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1377 {
1378         isdnloop_card *card = isdnloop_findcard(id);
1379
1380         if (card) {
1381                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1382                         return -ENODEV;
1383                 return isdnloop_writecmd(buf, len, 1, card);
1384         }
1385         printk(KERN_ERR
1386                "isdnloop: if_writecmd called with invalid driverId!\n");
1387         return -ENODEV;
1388 }
1389
1390 static int
1391 if_readstatus(u_char __user *buf, int len, int id, int channel)
1392 {
1393         isdnloop_card *card = isdnloop_findcard(id);
1394
1395         if (card) {
1396                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1397                         return -ENODEV;
1398                 return isdnloop_readstatus(buf, len, card);
1399         }
1400         printk(KERN_ERR
1401                "isdnloop: if_readstatus called with invalid driverId!\n");
1402         return -ENODEV;
1403 }
1404
1405 static int
1406 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1407 {
1408         isdnloop_card *card = isdnloop_findcard(id);
1409
1410         if (card) {
1411                 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1412                         return -ENODEV;
1413                 /* ack request stored in skb scratch area */
1414                 *(skb->head) = ack;
1415                 return isdnloop_sendbuf(channel, skb, card);
1416         }
1417         printk(KERN_ERR
1418                "isdnloop: if_sendbuf called with invalid driverId!\n");
1419         return -ENODEV;
1420 }
1421
1422 /*
1423  * Allocate a new card-struct, initialize it
1424  * link it into cards-list and register it at linklevel.
1425  */
1426 static isdnloop_card *
1427 isdnloop_initcard(char *id)
1428 {
1429         isdnloop_card *card;
1430         int i;
1431         card = kzalloc(sizeof(isdnloop_card), GFP_KERNEL);
1432         if (!card) {
1433                 printk(KERN_WARNING
1434                        "isdnloop: (%s) Could not allocate card-struct.\n", id);
1435                 return (isdnloop_card *) 0;
1436         }
1437         card->interface.owner = THIS_MODULE;
1438         card->interface.channels = ISDNLOOP_BCH;
1439         card->interface.hl_hdrlen  = 1; /* scratch area for storing ack flag*/
1440         card->interface.maxbufsize = 4000;
1441         card->interface.command = if_command;
1442         card->interface.writebuf_skb = if_sendbuf;
1443         card->interface.writecmd = if_writecmd;
1444         card->interface.readstat = if_readstatus;
1445         card->interface.features = ISDN_FEATURE_L2_X75I |
1446 #ifdef CONFIG_ISDN_X25
1447                 ISDN_FEATURE_L2_X25DTE |
1448                 ISDN_FEATURE_L2_X25DCE |
1449 #endif
1450                 ISDN_FEATURE_L2_HDLC |
1451                 ISDN_FEATURE_L3_TRANS |
1452                 ISDN_FEATURE_P_UNKNOWN;
1453         card->ptype = ISDN_PTYPE_UNKNOWN;
1454         strlcpy(card->interface.id, id, sizeof(card->interface.id));
1455         card->msg_buf_write = card->msg_buf;
1456         card->msg_buf_read = card->msg_buf;
1457         card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1458         for (i = 0; i < ISDNLOOP_BCH; i++) {
1459                 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1460                 skb_queue_head_init(&card->bqueue[i]);
1461         }
1462         skb_queue_head_init(&card->dqueue);
1463         spin_lock_init(&card->isdnloop_lock);
1464         card->next = cards;
1465         cards = card;
1466         if (!register_isdn(&card->interface)) {
1467                 cards = cards->next;
1468                 printk(KERN_WARNING
1469                        "isdnloop: Unable to register %s\n", id);
1470                 kfree(card);
1471                 return (isdnloop_card *) 0;
1472         }
1473         card->myid = card->interface.channels;
1474         return card;
1475 }
1476
1477 static int
1478 isdnloop_addcard(char *id1)
1479 {
1480         isdnloop_card *card;
1481         card = isdnloop_initcard(id1);
1482         if (!card) {
1483                 return -EIO;
1484         }
1485         printk(KERN_INFO
1486                "isdnloop: (%s) virtual card added\n",
1487                card->interface.id);
1488         return 0;
1489 }
1490
1491 static int __init
1492 isdnloop_init(void)
1493 {
1494         if (isdnloop_id)
1495                 return isdnloop_addcard(isdnloop_id);
1496
1497         return 0;
1498 }
1499
1500 static void __exit
1501 isdnloop_exit(void)
1502 {
1503         isdn_ctrl cmd;
1504         isdnloop_card *card = cards;
1505         isdnloop_card *last;
1506         int i;
1507
1508         isdnloop_stopallcards();
1509         while (card) {
1510                 cmd.command = ISDN_STAT_UNLOAD;
1511                 cmd.driver = card->myid;
1512                 card->interface.statcallb(&cmd);
1513                 for (i = 0; i < ISDNLOOP_BCH; i++)
1514                         isdnloop_free_queue(card, i);
1515                 card = card->next;
1516         }
1517         card = cards;
1518         while (card) {
1519                 last = card;
1520                 skb_queue_purge(&card->dqueue);
1521                 card = card->next;
1522                 kfree(last);
1523         }
1524         printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1525 }
1526
1527 module_init(isdnloop_init);
1528 module_exit(isdnloop_exit);