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   1 /* $Id: isdn_net.c,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
   2  *
   3  * Linux ISDN subsystem, network interfaces and related functions (linklevel).
   4  *
   5  * Copyright 1994-1998  by Fritz Elfert (fritz@isdn4linux.de)
   6  * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
   7  * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  * Data Over Voice (DOV) support added - Guy Ellis 23-Mar-02
  13  *                                       guy@traverse.com.au
  14  * Outgoing calls - looks for a 'V' in first char of dialed number
  15  * Incoming calls - checks first character of eaz as follows:
  16  *   Numeric - accept DATA only - original functionality
  17  *   'V'     - accept VOICE (DOV) only
  18  *   'B'     - accept BOTH DATA and DOV types
  19  *
  20  * Jan 2001: fix CISCO HDLC      Bjoern A. Zeeb <i4l@zabbadoz.net>
  21  *           for info on the protocol, see
  22  *           http://i4l.zabbadoz.net/i4l/cisco-hdlc.txt
  23  */
  24
  25 #include <linux/config.h>
  26 #include <linux/isdn.h>
  27 #include <net/arp.h>
  28 #include <net/dst.h>
  29 #include <net/pkt_sched.h>
  30 #include <linux/inetdevice.h>
  31 #include "isdn_common.h"
  32 #include "isdn_net.h"
  33 #ifdef CONFIG_ISDN_PPP
  34 #include "isdn_ppp.h"
  35 #endif
  36 #ifdef CONFIG_ISDN_X25
  37 #include <linux/concap.h>
  38 #include "isdn_concap.h"
  39 #endif
  40
  41
  42 /*
  43  * Outline of new tbusy handling:
  44  *
  45  * Old method, roughly spoken, consisted of setting tbusy when entering
  46  * isdn_net_start_xmit() and at several other locations and clearing
  47  * it from isdn_net_start_xmit() thread when sending was successful.
  48  *
  49  * With 2.3.x multithreaded network core, to prevent problems, tbusy should
  50  * only be set by the isdn_net_start_xmit() thread and only when a tx-busy
  51  * condition is detected. Other threads (in particular isdn_net_stat_callb())
  52  * are only allowed to clear tbusy.
  53  *
  54  * -HE
  55  */
  56
  57 /*
  58  * About SOFTNET:
  59  * Most of the changes were pretty obvious and basically done by HE already.
  60  *
  61  * One problem of the isdn net device code is that is uses struct net_device
  62  * for masters and slaves. However, only master interface are registered to
  63  * the network layer, and therefore, it only makes sense to call netif_*
  64  * functions on them.
  65  *
  66  * --KG
  67  */
  68
  69 /*
  70  * Find out if the netdevice has been ifup-ed yet.
  71  * For slaves, look at the corresponding master.
  72  */
  73 static __inline__ int isdn_net_device_started(isdn_net_dev *n)
  74 {
  75         isdn_net_local *lp = n->local;
  76         struct net_device *dev;
  77
  78         if (lp->master)
  79                 dev = lp->master;
  80         else
  81                 dev = &n->dev;
  82         return netif_running(dev);
  83 }
  84
  85 /*
  86  * wake up the network -> net_device queue.
  87  * For slaves, wake the corresponding master interface.
  88  */
  89 static __inline__ void isdn_net_device_wake_queue(isdn_net_local *lp)
  90 {
  91         if (lp->master)
  92                 netif_wake_queue(lp->master);
  93         else
  94                 netif_wake_queue(&lp->netdev->dev);
  95 }
  96
  97 /*
  98  * stop the network -> net_device queue.
  99  * For slaves, stop the corresponding master interface.
 100  */
 101 static __inline__ void isdn_net_device_stop_queue(isdn_net_local *lp)
 102 {
 103         if (lp->master)
 104                 netif_stop_queue(lp->master);
 105         else
 106                 netif_stop_queue(&lp->netdev->dev);
 107 }
 108
 109 /*
 110  * find out if the net_device which this lp belongs to (lp can be
 111  * master or slave) is busy. It's busy iff all (master and slave)
 112  * queues are busy
 113  */
 114 static __inline__ int isdn_net_device_busy(isdn_net_local *lp)
 115 {
 116         isdn_net_local *nlp;
 117         isdn_net_dev *nd;
 118         unsigned long flags;
 119
 120         if (!isdn_net_lp_busy(lp))
 121                 return 0;
 122
 123         if (lp->master)
 124                 nd = ((isdn_net_local *) lp->master->priv)->netdev;
 125         else
 126                 nd = lp->netdev;
 127
 128         spin_lock_irqsave(&nd->queue_lock, flags);
 129         nlp = lp->next;
 130         while (nlp != lp) {
 131                 if (!isdn_net_lp_busy(nlp)) {
 132                         spin_unlock_irqrestore(&nd->queue_lock, flags);
 133                         return 0;
 134                 }
 135                 nlp = nlp->next;
 136         }
 137         spin_unlock_irqrestore(&nd->queue_lock, flags);
 138         return 1;
 139 }
 140
 141 static __inline__ void isdn_net_inc_frame_cnt(isdn_net_local *lp)
 142 {
 143         atomic_inc(&lp->frame_cnt);
 144         if (isdn_net_device_busy(lp))
 145                 isdn_net_device_stop_queue(lp);
 146 }
 147
 148 static __inline__ void isdn_net_dec_frame_cnt(isdn_net_local *lp)
 149 {
 150         atomic_dec(&lp->frame_cnt);
 151
 152         if (!(isdn_net_device_busy(lp))) {
 153                 if (!skb_queue_empty(&lp->super_tx_queue)) {
 154                         schedule_work(&lp->tqueue);
 155                 } else {
 156                         isdn_net_device_wake_queue(lp);
 157                 }
 158        }
 159 }
 160
 161 static __inline__ void isdn_net_zero_frame_cnt(isdn_net_local *lp)
 162 {
 163         atomic_set(&lp->frame_cnt, 0);
 164 }
 165
 166 /* For 2.2.x we leave the transmitter busy timeout at 2 secs, just
 167  * to be safe.
 168  * For 2.3.x we push it up to 20 secs, because call establishment
 169  * (in particular callback) may take such a long time, and we
 170  * don't want confusing messages in the log. However, there is a slight
 171  * possibility that this large timeout will break other things like MPPP,
 172  * which might rely on the tx timeout. If so, we'll find out this way...
 173  */
 174
 175 #define ISDN_NET_TX_TIMEOUT (20*HZ)
 176
 177 /* Prototypes */
 178
 179 static int isdn_net_force_dial_lp(isdn_net_local *);
 180 static int isdn_net_start_xmit(struct sk_buff *, struct net_device *);
 181
 182 static void isdn_net_ciscohdlck_connected(isdn_net_local *lp);
 183 static void isdn_net_ciscohdlck_disconnected(isdn_net_local *lp);
 184
 185 char *isdn_net_revision = "$Revision: 1.1.2.2 $";
 186
 187  /*
 188   * Code for raw-networking over ISDN
 189   */
 190
 191 static void
 192 isdn_net_unreachable(struct net_device *dev, struct sk_buff *skb, char *reason)
 193 {
 194         if(skb) {
 195
 196                 u_short proto = ntohs(skb->protocol);
 197
 198                 printk(KERN_DEBUG "isdn_net: %s: %s, signalling dst_link_failure %s\n",
 199                        dev->name,
 200                        (reason != NULL) ? reason : "unknown",
 201                        (proto != ETH_P_IP) ? "Protocol != ETH_P_IP" : "");
 202
 203                 dst_link_failure(skb);
 204         }
 205         else {  /* dial not triggered by rawIP packet */
 206                 printk(KERN_DEBUG "isdn_net: %s: %s\n",
 207                            dev->name,
 208                            (reason != NULL) ? reason : "reason unknown");
 209         }
 210 }
 211
 212 static void
 213 isdn_net_reset(struct net_device *dev)
 214 {
 215 #ifdef CONFIG_ISDN_X25
 216         struct concap_device_ops * dops =
 217                 ( (isdn_net_local *) dev->priv ) -> dops;
 218         struct concap_proto * cprot =
 219                 ( (isdn_net_local *) dev->priv ) -> netdev -> cprot;
 220 #endif
 221 #ifdef CONFIG_ISDN_X25
 222         if( cprot && cprot -> pops && dops )
 223                 cprot -> pops -> restart ( cprot, dev, dops );
 224 #endif
 225 }
 226
 227 /* Open/initialize the board. */
 228 static int
 229 isdn_net_open(struct net_device *dev)
 230 {
 231         int i;
 232         struct net_device *p;
 233         struct in_device *in_dev;
 234
 235         /* moved here from isdn_net_reset, because only the master has an
 236            interface associated which is supposed to be started. BTW:
 237            we need to call netif_start_queue, not netif_wake_queue here */
 238         netif_start_queue(dev);
 239
 240         isdn_net_reset(dev);
 241         /* Fill in the MAC-level header (not needed, but for compatibility... */
 242         for (i = 0; i < ETH_ALEN - sizeof(u32); i++)
 243                 dev->dev_addr[i] = 0xfc;
 244         if ((in_dev = dev->ip_ptr) != NULL) {
 245                 /*
 246                  *      Any address will do - we take the first
 247                  */
 248                 struct in_ifaddr *ifa = in_dev->ifa_list;
 249                 if (ifa != NULL)
 250                         memcpy(dev->dev_addr+2, &ifa->ifa_local, 4);
 251         }
 252
 253         /* If this interface has slaves, start them also */
 254
 255         if ((p = (((isdn_net_local *) dev->priv)->slave))) {
 256                 while (p) {
 257                         isdn_net_reset(p);
 258                         p = (((isdn_net_local *) p->priv)->slave);
 259                 }
 260         }
 261         isdn_lock_drivers();
 262         return 0;
 263 }
 264
 265 /*
 266  * Assign an ISDN-channel to a net-interface
 267  */
 268 static void
 269 isdn_net_bind_channel(isdn_net_local * lp, int idx)
 270 {
 271         lp->flags |= ISDN_NET_CONNECTED;
 272         lp->isdn_device = dev->drvmap[idx];
 273         lp->isdn_channel = dev->chanmap[idx];
 274         dev->rx_netdev[idx] = lp->netdev;
 275         dev->st_netdev[idx] = lp->netdev;
 276 }
 277
 278 /*
 279  * unbind a net-interface (resets interface after an error)
 280  */
 281 static void
 282 isdn_net_unbind_channel(isdn_net_local * lp)
 283 {
 284         skb_queue_purge(&lp->super_tx_queue);
 285
 286         if (!lp->master) {      /* reset only master device */
 287                 /* Moral equivalent of dev_purge_queues():
 288                    BEWARE! This chunk of code cannot be called from hardware
 289                    interrupt handler. I hope it is true. --ANK
 290                  */
 291                 qdisc_reset(lp->netdev->dev.qdisc);
 292         }
 293         lp->dialstate = 0;
 294         dev->rx_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
 295         dev->st_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
 296         isdn_free_channel(lp->isdn_device, lp->isdn_channel, ISDN_USAGE_NET);
 297         lp->flags &= ~ISDN_NET_CONNECTED;
 298         lp->isdn_device = -1;
 299         lp->isdn_channel = -1;
 300 }
 301
 302 /*
 303  * Perform auto-hangup and cps-calculation for net-interfaces.
 304  *
 305  * auto-hangup:
 306  * Increment idle-counter (this counter is reset on any incoming or
 307  * outgoing packet), if counter exceeds configured limit either do a
 308  * hangup immediately or - if configured - wait until just before the next
 309  * charge-info.
 310  *
 311  * cps-calculation (needed for dynamic channel-bundling):
 312  * Since this function is called every second, simply reset the
 313  * byte-counter of the interface after copying it to the cps-variable.
 314  */
 315 static unsigned long last_jiffies = -HZ;
 316
 317 void
 318 isdn_net_autohup(void)
 319 {
 320         isdn_net_dev *p = dev->netdev;
 321         int anymore;
 322
 323         anymore = 0;
 324         while (p) {
 325                 isdn_net_local *l = p->local;
 326                 if (jiffies == last_jiffies)
 327                         l->cps = l->transcount;
 328                 else
 329                         l->cps = (l->transcount * HZ) / (jiffies - last_jiffies);
 330                 l->transcount = 0;
 331                 if (dev->net_verbose > 3)
 332                         printk(KERN_DEBUG "%s: %d bogocps\n", l->name, l->cps);
 333                 if ((l->flags & ISDN_NET_CONNECTED) && (!l->dialstate)) {
 334                         anymore = 1;
 335                         l->huptimer++;
 336                         /*
 337                          * if there is some dialmode where timeout-hangup
 338                          * should _not_ be done, check for that here
 339                          */
 340                         if ((l->onhtime) &&
 341                             (l->huptimer > l->onhtime))
 342                         {
 343                                 if (l->hupflags & ISDN_MANCHARGE &&
 344                                     l->hupflags & ISDN_CHARGEHUP) {
 345                                         while (time_after(jiffies, l->chargetime + l->chargeint))
 346                                                 l->chargetime += l->chargeint;
 347                                         if (time_after(jiffies, l->chargetime + l->chargeint - 2 * HZ))
 348                                                 if (l->outgoing || l->hupflags & ISDN_INHUP)
 349                                                         isdn_net_hangup(&p->dev);
 350                                 } else if (l->outgoing) {
 351                                         if (l->hupflags & ISDN_CHARGEHUP) {
 352                                                 if (l->hupflags & ISDN_WAITCHARGE) {
 353                                                         printk(KERN_DEBUG "isdn_net: Hupflags of %s are %X\n",
 354                                                                l->name, l->hupflags);
 355                                                         isdn_net_hangup(&p->dev);
 356                                                 } else if (time_after(jiffies, l->chargetime + l->chargeint)) {
 357                                                         printk(KERN_DEBUG
 358                                                                "isdn_net: %s: chtime = %lu, chint = %d\n",
 359                                                                l->name, l->chargetime, l->chargeint);
 360                                                         isdn_net_hangup(&p->dev);
 361                                                 }
 362                                         } else
 363                                                 isdn_net_hangup(&p->dev);
 364                                 } else if (l->hupflags & ISDN_INHUP)
 365                                         isdn_net_hangup(&p->dev);
 366                         }
 367
 368                         if(dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*l) == ISDN_NET_DM_OFF)) {
 369                                 isdn_net_hangup(&p->dev);
 370                                 break;
 371                         }
 372                 }
 373                 p = (isdn_net_dev *) p->next;
 374         }
 375         last_jiffies = jiffies;
 376         isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, anymore);
 377 }
 378
 379 static void isdn_net_lp_disconnected(isdn_net_local *lp)
 380 {
 381         isdn_net_rm_from_bundle(lp);
 382 }
 383
 384 /*
 385  * Handle status-messages from ISDN-interfacecard.
 386  * This function is called from within the main-status-dispatcher
 387  * isdn_status_callback, which itself is called from the low-level driver.
 388  * Return: 1 = Event handled, 0 = not for us or unknown Event.
 389  */
 390 int
 391 isdn_net_stat_callback(int idx, isdn_ctrl *c)
 392 {
 393         isdn_net_dev *p = dev->st_netdev[idx];
 394         int cmd = c->command;
 395
 396         if (p) {
 397                 isdn_net_local *lp = p->local;
 398 #ifdef CONFIG_ISDN_X25
 399                 struct concap_proto *cprot = lp->netdev->cprot;
 400                 struct concap_proto_ops *pops = cprot ? cprot->pops : NULL;
 401 #endif
 402                 switch (cmd) {
 403                         case ISDN_STAT_BSENT:
 404                                 /* A packet has successfully been sent out */
 405                                 if ((lp->flags & ISDN_NET_CONNECTED) &&
 406                                     (!lp->dialstate)) {
 407                                         isdn_net_dec_frame_cnt(lp);
 408                                         lp->stats.tx_packets++;
 409                                         lp->stats.tx_bytes += c->parm.length;
 410                                 }
 411                                 return 1;
 412                         case ISDN_STAT_DCONN:
 413                                 /* D-Channel is up */
 414                                 switch (lp->dialstate) {
 415                                         case 4:
 416                                         case 7:
 417                                         case 8:
 418                                                 lp->dialstate++;
 419                                                 return 1;
 420                                         case 12:
 421                                                 lp->dialstate = 5;
 422                                                 return 1;
 423                                 }
 424                                 break;
 425                         case ISDN_STAT_DHUP:
 426                                 /* Either D-Channel-hangup or error during dialout */
 427 #ifdef CONFIG_ISDN_X25
 428                                 /* If we are not connencted then dialing had
 429                                    failed. If there are generic encap protocol
 430                                    receiver routines signal the closure of
 431                                    the link*/
 432
 433                                 if( !(lp->flags & ISDN_NET_CONNECTED)
 434                                     && pops && pops -> disconn_ind )
 435                                         pops -> disconn_ind(cprot);
 436 #endif /* CONFIG_ISDN_X25 */
 437                                 if ((!lp->dialstate) && (lp->flags & ISDN_NET_CONNECTED)) {
 438                                         if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK)
 439                                                 isdn_net_ciscohdlck_disconnected(lp);
 440 #ifdef CONFIG_ISDN_PPP
 441                                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
 442                                                 isdn_ppp_free(lp);
 443 #endif
 444                                         isdn_net_lp_disconnected(lp);
 445                                         isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
 446                                         printk(KERN_INFO "%s: remote hangup\n", lp->name);
 447                                         printk(KERN_INFO "%s: Chargesum is %d\n", lp->name,
 448                                                lp->charge);
 449                                         isdn_net_unbind_channel(lp);
 450                                         return 1;
 451                                 }
 452                                 break;
 453 #ifdef CONFIG_ISDN_X25
 454                         case ISDN_STAT_BHUP:
 455                                 /* B-Channel-hangup */
 456                                 /* try if there are generic encap protocol
 457                                    receiver routines and signal the closure of
 458                                    the link */
 459                                 if( pops  &&  pops -> disconn_ind ){
 460                                                 pops -> disconn_ind(cprot);
 461                                                 return 1;
 462                                         }
 463                                 break;
 464 #endif /* CONFIG_ISDN_X25 */
 465                         case ISDN_STAT_BCONN:
 466                                 /* B-Channel is up */
 467                                 isdn_net_zero_frame_cnt(lp);
 468                                 switch (lp->dialstate) {
 469                                         case 5:
 470                                         case 6:
 471                                         case 7:
 472                                         case 8:
 473                                         case 9:
 474                                         case 10:
 475                                         case 12:
 476                                                 if (lp->dialstate <= 6) {
 477                                                         dev->usage[idx] |= ISDN_USAGE_OUTGOING;
 478                                                         isdn_info_update();
 479                                                 } else
 480                                                         dev->rx_netdev[idx] = p;
 481                                                 lp->dialstate = 0;
 482                                                 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 1);
 483                                                 if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK)
 484                                                         isdn_net_ciscohdlck_connected(lp);
 485                                                 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) {
 486                                                         if (lp->master) { /* is lp a slave? */
 487                                                                 isdn_net_dev *nd = ((isdn_net_local *)lp->master->priv)->netdev;
 488                                                                 isdn_net_add_to_bundle(nd, lp);
 489                                                         }
 490                                                 }
 491                                                 printk(KERN_INFO "isdn_net: %s connected\n", lp->name);
 492                                                 /* If first Chargeinfo comes before B-Channel connect,
 493                                                  * we correct the timestamp here.
 494                                                  */
 495                                                 lp->chargetime = jiffies;
 496
 497                                                 /* reset dial-timeout */
 498                                                 lp->dialstarted = 0;
 499                                                 lp->dialwait_timer = 0;
 500
 501 #ifdef CONFIG_ISDN_PPP
 502                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
 503                                                         isdn_ppp_wakeup_daemon(lp);
 504 #endif
 505 #ifdef CONFIG_ISDN_X25
 506                                                 /* try if there are generic concap receiver routines */
 507                                                 if( pops )
 508                                                         if( pops->connect_ind)
 509                                                                 pops->connect_ind(cprot);
 510 #endif /* CONFIG_ISDN_X25 */
 511                                                 /* ppp needs to do negotiations first */
 512                                                 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP)
 513                                                         isdn_net_device_wake_queue(lp);
 514                                                 return 1;
 515                                 }
 516                                 break;
 517                         case ISDN_STAT_NODCH:
 518                                 /* No D-Channel avail. */
 519                                 if (lp->dialstate == 4) {
 520                                         lp->dialstate--;
 521                                         return 1;
 522                                 }
 523                                 break;
 524                         case ISDN_STAT_CINF:
 525                                 /* Charge-info from TelCo. Calculate interval between
 526                                  * charge-infos and set timestamp for last info for
 527                                  * usage by isdn_net_autohup()
 528                                  */
 529                                 lp->charge++;
 530                                 if (lp->hupflags & ISDN_HAVECHARGE) {
 531                                         lp->hupflags &= ~ISDN_WAITCHARGE;
 532                                         lp->chargeint = jiffies - lp->chargetime - (2 * HZ);
 533                                 }
 534                                 if (lp->hupflags & ISDN_WAITCHARGE)
 535                                         lp->hupflags |= ISDN_HAVECHARGE;
 536                                 lp->chargetime = jiffies;
 537                                 printk(KERN_DEBUG "isdn_net: Got CINF chargetime of %s now %lu\n",
 538                                        lp->name, lp->chargetime);
 539                                 return 1;
 540                 }
 541         }
 542         return 0;
 543 }
 544
 545 /*
 546  * Perform dialout for net-interfaces and timeout-handling for
 547  * D-Channel-up and B-Channel-up Messages.
 548  * This function is initially called from within isdn_net_start_xmit() or
 549  * or isdn_net_find_icall() after initializing the dialstate for an
 550  * interface. If further calls are needed, the function schedules itself
 551  * for a timer-callback via isdn_timer_function().
 552  * The dialstate is also affected by incoming status-messages from
 553  * the ISDN-Channel which are handled in isdn_net_stat_callback() above.
 554  */
 555 void
 556 isdn_net_dial(void)
 557 {
 558         isdn_net_dev *p = dev->netdev;
 559         int anymore = 0;
 560         int i;
 561         isdn_ctrl cmd;
 562         u_char *phone_number;
 563
 564         while (p) {
 565                 isdn_net_local *lp = p->local;
 566
 567 #ifdef ISDN_DEBUG_NET_DIAL
 568                 if (lp->dialstate)
 569                         printk(KERN_DEBUG "%s: dialstate=%d\n", lp->name, lp->dialstate);
 570 #endif
 571                 switch (lp->dialstate) {
 572                         case 0:
 573                                 /* Nothing to do for this interface */
 574                                 break;
 575                         case 1:
 576                                 /* Initiate dialout. Set phone-number-pointer to first number
 577                                  * of interface.
 578                                  */
 579                                 lp->dial = lp->phone[1];
 580                                 if (!lp->dial) {
 581                                         printk(KERN_WARNING "%s: phone number deleted?\n",
 582                                                lp->name);
 583                                         isdn_net_hangup(&p->dev);
 584                                         break;
 585                                 }
 586                                 anymore = 1;
 587
 588                                 if(lp->dialtimeout > 0)
 589                                         if(lp->dialstarted == 0 || time_after(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait)) {
 590                                                 lp->dialstarted = jiffies;
 591                                                 lp->dialwait_timer = 0;
 592                                         }
 593
 594                                 lp->dialstate++;
 595                                 /* Fall through */
 596                         case 2:
 597                                 /* Prepare dialing. Clear EAZ, then set EAZ. */
 598                                 cmd.driver = lp->isdn_device;
 599                                 cmd.arg = lp->isdn_channel;
 600                                 cmd.command = ISDN_CMD_CLREAZ;
 601                                 isdn_command(&cmd);
 602                                 sprintf(cmd.parm.num, "%s", isdn_map_eaz2msn(lp->msn, cmd.driver));
 603                                 cmd.command = ISDN_CMD_SETEAZ;
 604                                 isdn_command(&cmd);
 605                                 lp->dialretry = 0;
 606                                 anymore = 1;
 607                                 lp->dialstate++;
 608                                 /* Fall through */
 609                         case 3:
 610                                 /* Setup interface, dial current phone-number, switch to next number.
 611                                  * If list of phone-numbers is exhausted, increment
 612                                  * retry-counter.
 613                                  */
 614                                 if(dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF)) {
 615                                         char *s;
 616                                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 617                                                 s = "dial suppressed: isdn system stopped";
 618                                         else
 619                                                 s = "dial suppressed: dialmode `off'";
 620                                         isdn_net_unreachable(&p->dev, NULL, s);
 621                                         isdn_net_hangup(&p->dev);
 622                                         break;
 623                                 }
 624                                 cmd.driver = lp->isdn_device;
 625                                 cmd.command = ISDN_CMD_SETL2;
 626                                 cmd.arg = lp->isdn_channel + (lp->l2_proto << 8);
 627                                 isdn_command(&cmd);
 628                                 cmd.driver = lp->isdn_device;
 629                                 cmd.command = ISDN_CMD_SETL3;
 630                                 cmd.arg = lp->isdn_channel + (lp->l3_proto << 8);
 631                                 isdn_command(&cmd);
 632                                 cmd.driver = lp->isdn_device;
 633                                 cmd.arg = lp->isdn_channel;
 634                                 if (!lp->dial) {
 635                                         printk(KERN_WARNING "%s: phone number deleted?\n",
 636                                                lp->name);
 637                                         isdn_net_hangup(&p->dev);
 638                                         break;
 639                                 }
 640                                 if (!strncmp(lp->dial->num, "LEASED", strlen("LEASED"))) {
 641                                         lp->dialstate = 4;
 642                                         printk(KERN_INFO "%s: Open leased line ...\n", lp->name);
 643                                 } else {
 644                                         if(lp->dialtimeout > 0)
 645                                                 if (time_after(jiffies, lp->dialstarted + lp->dialtimeout)) {
 646                                                         lp->dialwait_timer = jiffies + lp->dialwait;
 647                                                         lp->dialstarted = 0;
 648                                                         isdn_net_unreachable(&p->dev, NULL, "dial: timed out");
 649                                                         isdn_net_hangup(&p->dev);
 650                                                         break;
 651                                                 }
 652
 653                                         cmd.driver = lp->isdn_device;
 654                                         cmd.command = ISDN_CMD_DIAL;
 655                                         cmd.parm.setup.si2 = 0;
 656
 657                                         /* check for DOV */
 658                                         phone_number = lp->dial->num;
 659                                         if ((*phone_number == 'v') ||
 660                                             (*phone_number == 'V')) { /* DOV call */
 661                                                 cmd.parm.setup.si1 = 1;
 662                                         } else { /* DATA call */
 663                                                 cmd.parm.setup.si1 = 7;
 664                                         }
 665
 666                                         strcpy(cmd.parm.setup.phone, phone_number);
 667                                         /*
 668                                          * Switch to next number or back to start if at end of list.
 669                                          */
 670                                         if (!(lp->dial = (isdn_net_phone *) lp->dial->next)) {
 671                                                 lp->dial = lp->phone[1];
 672                                                 lp->dialretry++;
 673
 674                                                 if (lp->dialretry > lp->dialmax) {
 675                                                         if (lp->dialtimeout == 0) {
 676                                                                 lp->dialwait_timer = jiffies + lp->dialwait;
 677                                                                 lp->dialstarted = 0;
 678                                                                 isdn_net_unreachable(&p->dev, NULL, "dial: tried all numbers dialmax times");
 679                                                         }
 680                                                         isdn_net_hangup(&p->dev);
 681                                                         break;
 682                                                 }
 683                                         }
 684                                         sprintf(cmd.parm.setup.eazmsn, "%s",
 685                                                 isdn_map_eaz2msn(lp->msn, cmd.driver));
 686                                         i = isdn_dc2minor(lp->isdn_device, lp->isdn_channel);
 687                                         if (i >= 0) {
 688                                                 strcpy(dev->num[i], cmd.parm.setup.phone);
 689                                                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
 690                                                 isdn_info_update();
 691                                         }
 692                                         printk(KERN_INFO "%s: dialing %d %s... %s\n", lp->name,
 693                                                lp->dialretry, cmd.parm.setup.phone,
 694                                                (cmd.parm.setup.si1 == 1) ? "DOV" : "");
 695                                         lp->dtimer = 0;
 696 #ifdef ISDN_DEBUG_NET_DIAL
 697                                         printk(KERN_DEBUG "dial: d=%d c=%d\n", lp->isdn_device,
 698                                                lp->isdn_channel);
 699 #endif
 700                                         isdn_command(&cmd);
 701                                 }
 702                                 lp->huptimer = 0;
 703                                 lp->outgoing = 1;
 704                                 if (lp->chargeint) {
 705                                         lp->hupflags |= ISDN_HAVECHARGE;
 706                                         lp->hupflags &= ~ISDN_WAITCHARGE;
 707                                 } else {
 708                                         lp->hupflags |= ISDN_WAITCHARGE;
 709                                         lp->hupflags &= ~ISDN_HAVECHARGE;
 710                                 }
 711                                 anymore = 1;
 712                                 lp->dialstate =
 713                                     (lp->cbdelay &&
 714                                      (lp->flags & ISDN_NET_CBOUT)) ? 12 : 4;
 715                                 break;
 716                         case 4:
 717                                 /* Wait for D-Channel-connect.
 718                                  * If timeout, switch back to state 3.
 719                                  * Dialmax-handling moved to state 3.
 720                                  */
 721                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
 722                                         lp->dialstate = 3;
 723                                 anymore = 1;
 724                                 break;
 725                         case 5:
 726                                 /* Got D-Channel-Connect, send B-Channel-request */
 727                                 cmd.driver = lp->isdn_device;
 728                                 cmd.arg = lp->isdn_channel;
 729                                 cmd.command = ISDN_CMD_ACCEPTB;
 730                                 anymore = 1;
 731                                 lp->dtimer = 0;
 732                                 lp->dialstate++;
 733                                 isdn_command(&cmd);
 734                                 break;
 735                         case 6:
 736                                 /* Wait for B- or D-Channel-connect. If timeout,
 737                                  * switch back to state 3.
 738                                  */
 739 #ifdef ISDN_DEBUG_NET_DIAL
 740                                 printk(KERN_DEBUG "dialtimer2: %d\n", lp->dtimer);
 741 #endif
 742                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
 743                                         lp->dialstate = 3;
 744                                 anymore = 1;
 745                                 break;
 746                         case 7:
 747                                 /* Got incoming Call, setup L2 and L3 protocols,
 748                                  * then wait for D-Channel-connect
 749                                  */
 750 #ifdef ISDN_DEBUG_NET_DIAL
 751                                 printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer);
 752 #endif
 753                                 cmd.driver = lp->isdn_device;
 754                                 cmd.command = ISDN_CMD_SETL2;
 755                                 cmd.arg = lp->isdn_channel + (lp->l2_proto << 8);
 756                                 isdn_command(&cmd);
 757                                 cmd.driver = lp->isdn_device;
 758                                 cmd.command = ISDN_CMD_SETL3;
 759                                 cmd.arg = lp->isdn_channel + (lp->l3_proto << 8);
 760                                 isdn_command(&cmd);
 761                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT15)
 762                                         isdn_net_hangup(&p->dev);
 763                                 else {
 764                                         anymore = 1;
 765                                         lp->dialstate++;
 766                                 }
 767                                 break;
 768                         case 9:
 769                                 /* Got incoming D-Channel-Connect, send B-Channel-request */
 770                                 cmd.driver = lp->isdn_device;
 771                                 cmd.arg = lp->isdn_channel;
 772                                 cmd.command = ISDN_CMD_ACCEPTB;
 773                                 isdn_command(&cmd);
 774                                 anymore = 1;
 775                                 lp->dtimer = 0;
 776                                 lp->dialstate++;
 777                                 break;
 778                         case 8:
 779                         case 10:
 780                                 /*  Wait for B- or D-channel-connect */
 781 #ifdef ISDN_DEBUG_NET_DIAL
 782                                 printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer);
 783 #endif
 784                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
 785                                         isdn_net_hangup(&p->dev);
 786                                 else
 787                                         anymore = 1;
 788                                 break;
 789                         case 11:
 790                                 /* Callback Delay */
 791                                 if (lp->dtimer++ > lp->cbdelay)
 792                                         lp->dialstate = 1;
 793                                 anymore = 1;
 794                                 break;
 795                         case 12:
 796                                 /* Remote does callback. Hangup after cbdelay, then wait for incoming
 797                                  * call (in state 4).
 798                                  */
 799                                 if (lp->dtimer++ > lp->cbdelay)
 800                                 {
 801                                         printk(KERN_INFO "%s: hangup waiting for callback ...\n", lp->name);
 802                                         lp->dtimer = 0;
 803                                         lp->dialstate = 4;
 804                                         cmd.driver = lp->isdn_device;
 805                                         cmd.command = ISDN_CMD_HANGUP;
 806                                         cmd.arg = lp->isdn_channel;
 807                                         isdn_command(&cmd);
 808                                         isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
 809                                 }
 810                                 anymore = 1;
 811                                 break;
 812                         default:
 813                                 printk(KERN_WARNING "isdn_net: Illegal dialstate %d for device %s\n",
 814                                        lp->dialstate, lp->name);
 815                 }
 816                 p = (isdn_net_dev *) p->next;
 817         }
 818         isdn_timer_ctrl(ISDN_TIMER_NETDIAL, anymore);
 819 }
 820
 821 /*
 822  * Perform hangup for a net-interface.
 823  */
 824 void
 825 isdn_net_hangup(struct net_device *d)
 826 {
 827         isdn_net_local *lp = (isdn_net_local *) d->priv;
 828         isdn_ctrl cmd;
 829 #ifdef CONFIG_ISDN_X25
 830         struct concap_proto *cprot = lp->netdev->cprot;
 831         struct concap_proto_ops *pops = cprot ? cprot->pops : NULL;
 832 #endif
 833
 834         if (lp->flags & ISDN_NET_CONNECTED) {
 835                 if (lp->slave != NULL) {
 836                         isdn_net_local *slp = (isdn_net_local *)lp->slave->priv;
 837                         if (slp->flags & ISDN_NET_CONNECTED) {
 838                                 printk(KERN_INFO
 839                                         "isdn_net: hang up slave %s before %s\n",
 840                                         slp->name, lp->name);
 841                                 isdn_net_hangup(lp->slave);
 842                         }
 843                 }
 844                 printk(KERN_INFO "isdn_net: local hangup %s\n", lp->name);
 845 #ifdef CONFIG_ISDN_PPP
 846                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
 847                         isdn_ppp_free(lp);
 848 #endif
 849                 isdn_net_lp_disconnected(lp);
 850 #ifdef CONFIG_ISDN_X25
 851                 /* try if there are generic encap protocol
 852                    receiver routines and signal the closure of
 853                    the link */
 854                 if( pops && pops -> disconn_ind )
 855                   pops -> disconn_ind(cprot);
 856 #endif /* CONFIG_ISDN_X25 */
 857
 858                 cmd.driver = lp->isdn_device;
 859                 cmd.command = ISDN_CMD_HANGUP;
 860                 cmd.arg = lp->isdn_channel;
 861                 isdn_command(&cmd);
 862                 printk(KERN_INFO "%s: Chargesum is %d\n", lp->name, lp->charge);
 863                 isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
 864         }
 865         isdn_net_unbind_channel(lp);
 866 }
 867
 868 typedef struct {
 869         unsigned short source;
 870         unsigned short dest;
 871 } ip_ports;
 872
 873 static void
 874 isdn_net_log_skb(struct sk_buff * skb, isdn_net_local * lp)
 875 {
 876         u_char *p = skb->nh.raw; /* hopefully, this was set correctly */
 877         unsigned short proto = ntohs(skb->protocol);
 878         int data_ofs;
 879         ip_ports *ipp;
 880         char addinfo[100];
 881
 882         addinfo[0] = '\0';
 883         /* This check stolen from 2.1.72 dev_queue_xmit_nit() */
 884         if (skb->nh.raw < skb->data || skb->nh.raw >= skb->tail) {
 885                 /* fall back to old isdn_net_log_packet method() */
 886                 char * buf = skb->data;
 887
 888                 printk(KERN_DEBUG "isdn_net: protocol %04x is buggy, dev %s\n", skb->protocol, lp->name);
 889                 p = buf;
 890                 proto = ETH_P_IP;
 891                 switch (lp->p_encap) {
 892                         case ISDN_NET_ENCAP_IPTYP:
 893                                 proto = ntohs(*(unsigned short *) &buf[0]);
 894                                 p = &buf[2];
 895                                 break;
 896                         case ISDN_NET_ENCAP_ETHER:
 897                                 proto = ntohs(*(unsigned short *) &buf[12]);
 898                                 p = &buf[14];
 899                                 break;
 900                         case ISDN_NET_ENCAP_CISCOHDLC:
 901                                 proto = ntohs(*(unsigned short *) &buf[2]);
 902                                 p = &buf[4];
 903                                 break;
 904 #ifdef CONFIG_ISDN_PPP
 905                         case ISDN_NET_ENCAP_SYNCPPP:
 906                                 proto = ntohs(skb->protocol);
 907                                 p = &buf[IPPP_MAX_HEADER];
 908                                 break;
 909 #endif
 910                 }
 911         }
 912         data_ofs = ((p[0] & 15) * 4);
 913         switch (proto) {
 914                 case ETH_P_IP:
 915                         switch (p[9]) {
 916                                 case 1:
 917                                         strcpy(addinfo, " ICMP");
 918                                         break;
 919                                 case 2:
 920                                         strcpy(addinfo, " IGMP");
 921                                         break;
 922                                 case 4:
 923                                         strcpy(addinfo, " IPIP");
 924                                         break;
 925                                 case 6:
 926                                         ipp = (ip_ports *) (&p[data_ofs]);
 927                                         sprintf(addinfo, " TCP, port: %d -> %d", ntohs(ipp->source),
 928                                                 ntohs(ipp->dest));
 929                                         break;
 930                                 case 8:
 931                                         strcpy(addinfo, " EGP");
 932                                         break;
 933                                 case 12:
 934                                         strcpy(addinfo, " PUP");
 935                                         break;
 936                                 case 17:
 937                                         ipp = (ip_ports *) (&p[data_ofs]);
 938                                         sprintf(addinfo, " UDP, port: %d -> %d", ntohs(ipp->source),
 939                                                 ntohs(ipp->dest));
 940                                         break;
 941                                 case 22:
 942                                         strcpy(addinfo, " IDP");
 943                                         break;
 944                         }
 945                         printk(KERN_INFO
 946                                 "OPEN: %d.%d.%d.%d -> %d.%d.%d.%d%s\n",
 947
 948                                p[12], p[13], p[14], p[15],
 949                                p[16], p[17], p[18], p[19],
 950                                addinfo);
 951                         break;
 952                 case ETH_P_ARP:
 953                         printk(KERN_INFO
 954                                 "OPEN: ARP %d.%d.%d.%d -> *.*.*.* ?%d.%d.%d.%d\n",
 955                                p[14], p[15], p[16], p[17],
 956                                p[24], p[25], p[26], p[27]);
 957                         break;
 958         }
 959 }
 960
 961 /*
 962  * this function is used to send supervisory data, i.e. data which was
 963  * not received from the network layer, but e.g. frames from ipppd, CCP
 964  * reset frames etc.
 965  */
 966 void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb)
 967 {
 968         if (in_irq()) {
 969                 // we can't grab the lock from irq context,
 970                 // so we just queue the packet
 971                 skb_queue_tail(&lp->super_tx_queue, skb);
 972                 schedule_work(&lp->tqueue);
 973                 return;
 974         }
 975
 976         spin_lock_bh(&lp->xmit_lock);
 977         if (!isdn_net_lp_busy(lp)) {
 978                 isdn_net_writebuf_skb(lp, skb);
 979         } else {
 980                 skb_queue_tail(&lp->super_tx_queue, skb);
 981         }
 982         spin_unlock_bh(&lp->xmit_lock);
 983 }
 984
 985 /*
 986  * called from tq_immediate
 987  */
 988 static void isdn_net_softint(void *private)
 989 {
 990         isdn_net_local *lp = private;
 991         struct sk_buff *skb;
 992
 993         spin_lock_bh(&lp->xmit_lock);
 994         while (!isdn_net_lp_busy(lp)) {
 995                 skb = skb_dequeue(&lp->super_tx_queue);
 996                 if (!skb)
 997                         break;
 998                 isdn_net_writebuf_skb(lp, skb);
 999         }
1000         spin_unlock_bh(&lp->xmit_lock);
1001 }
1002
1003 /*
1004  * all frames sent from the (net) LL to a HL driver should go via this function
1005  * it's serialized by the caller holding the lp->xmit_lock spinlock
1006  */
1007 void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb)
1008 {
1009         int ret;
1010         int len = skb->len;     /* save len */
1011
1012         /* before obtaining the lock the caller should have checked that
1013            the lp isn't busy */
1014         if (isdn_net_lp_busy(lp)) {
1015                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1016                 goto error;
1017         }
1018
1019         if (!(lp->flags & ISDN_NET_CONNECTED)) {
1020                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1021                 goto error;
1022         }
1023         ret = isdn_writebuf_skb_stub(lp->isdn_device, lp->isdn_channel, 1, skb);
1024         if (ret != len) {
1025                 /* we should never get here */
1026                 printk(KERN_WARNING "%s: HL driver queue full\n", lp->name);
1027                 goto error;
1028         }
1029
1030         lp->transcount += len;
1031         isdn_net_inc_frame_cnt(lp);
1032         return;
1033
1034  error:
1035         dev_kfree_skb(skb);
1036         lp->stats.tx_errors++;
1037
1038 }
1039
1040
1041 /*
1042  *  Helper function for isdn_net_start_xmit.
1043  *  When called, the connection is already established.
1044  *  Based on cps-calculation, check if device is overloaded.
1045  *  If so, and if a slave exists, trigger dialing for it.
1046  *  If any slave is online, deliver packets using a simple round robin
1047  *  scheme.
1048  *
1049  *  Return: 0 on success, !0 on failure.
1050  */
1051
1052 static int
1053 isdn_net_xmit(struct net_device *ndev, struct sk_buff *skb)
1054 {
1055         isdn_net_dev *nd;
1056         isdn_net_local *slp;
1057         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
1058         int retv = 0;
1059
1060         if (((isdn_net_local *) (ndev->priv))->master) {
1061                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1062                 dev_kfree_skb(skb);
1063                 return 0;
1064         }
1065
1066         /* For the other encaps the header has already been built */
1067 #ifdef CONFIG_ISDN_PPP
1068         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
1069                 return isdn_ppp_xmit(skb, ndev);
1070         }
1071 #endif
1072         nd = ((isdn_net_local *) ndev->priv)->netdev;
1073         lp = isdn_net_get_locked_lp(nd);
1074         if (!lp) {
1075                 printk(KERN_WARNING "%s: all channels busy - requeuing!\n", ndev->name);
1076                 return 1;
1077         }
1078         /* we have our lp locked from now on */
1079
1080         /* Reset hangup-timeout */
1081         lp->huptimer = 0; // FIXME?
1082         isdn_net_writebuf_skb(lp, skb);
1083         spin_unlock_bh(&lp->xmit_lock);
1084
1085         /* the following stuff is here for backwards compatibility.
1086          * in future, start-up and hangup of slaves (based on current load)
1087          * should move to userspace and get based on an overall cps
1088          * calculation
1089          */
1090         if (lp->cps > lp->triggercps) {
1091                 if (lp->slave) {
1092                         if (!lp->sqfull) {
1093                                 /* First time overload: set timestamp only */
1094                                 lp->sqfull = 1;
1095                                 lp->sqfull_stamp = jiffies;
1096                         } else {
1097                                 /* subsequent overload: if slavedelay exceeded, start dialing */
1098                                 if (time_after(jiffies, lp->sqfull_stamp + lp->slavedelay)) {
1099                                         slp = lp->slave->priv;
1100                                         if (!(slp->flags & ISDN_NET_CONNECTED)) {
1101                                                 isdn_net_force_dial_lp((isdn_net_local *) lp->slave->priv);
1102                                         }
1103                                 }
1104                         }
1105                 }
1106         } else {
1107                 if (lp->sqfull && time_after(jiffies, lp->sqfull_stamp + lp->slavedelay + (10 * HZ))) {
1108                         lp->sqfull = 0;
1109                 }
1110                 /* this is a hack to allow auto-hangup for slaves on moderate loads */
1111                 nd->queue = nd->local;
1112         }
1113
1114         return retv;
1115
1116 }
1117
1118 static void
1119 isdn_net_adjust_hdr(struct sk_buff *skb, struct net_device *dev)
1120 {
1121         isdn_net_local *lp = (isdn_net_local *) dev->priv;
1122         if (!skb)
1123                 return;
1124         if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
1125                 int pullsize = (ulong)skb->nh.raw - (ulong)skb->data - ETH_HLEN;
1126                 if (pullsize > 0) {
1127                         printk(KERN_DEBUG "isdn_net: Pull junk %d\n", pullsize);
1128                         skb_pull(skb, pullsize);
1129                 }
1130         }
1131 }
1132
1133
1134 static void isdn_net_tx_timeout(struct net_device * ndev)
1135 {
1136         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
1137
1138         printk(KERN_WARNING "isdn_tx_timeout dev %s dialstate %d\n", ndev->name, lp->dialstate);
1139         if (!lp->dialstate){
1140                 lp->stats.tx_errors++;
1141                 /*
1142                  * There is a certain probability that this currently
1143                  * works at all because if we always wake up the interface,
1144                  * then upper layer will try to send the next packet
1145                  * immediately. And then, the old clean_up logic in the
1146                  * driver will hopefully continue to work as it used to do.
1147                  *
1148                  * This is rather primitive right know, we better should
1149                  * clean internal queues here, in particular for multilink and
1150                  * ppp, and reset HL driver's channel, too.   --HE
1151                  *
1152                  * actually, this may not matter at all, because ISDN hardware
1153                  * should not see transmitter hangs at all IMO
1154                  * changed KERN_DEBUG to KERN_WARNING to find out if this is
1155                  * ever called   --KG
1156                  */
1157         }
1158         ndev->trans_start = jiffies;
1159         netif_wake_queue(ndev);
1160 }
1161
1162 /*
1163  * Try sending a packet.
1164  * If this interface isn't connected to a ISDN-Channel, find a free channel,
1165  * and start dialing.
1166  */
1167 static int
1168 isdn_net_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1169 {
1170         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
1171 #ifdef CONFIG_ISDN_X25
1172         struct concap_proto * cprot = lp -> netdev -> cprot;
1173 /* At this point hard_start_xmit() passes control to the encapsulation
1174    protocol (if present).
1175    For X.25 auto-dialing is completly bypassed because:
1176    - It does not conform with the semantics of a reliable datalink
1177      service as needed by X.25 PLP.
1178    - I don't want that the interface starts dialing when the network layer
1179      sends a message which requests to disconnect the lapb link (or if it
1180      sends any other message not resulting in data transmission).
1181    Instead, dialing will be initiated by the encapsulation protocol entity
1182    when a dl_establish request is received from the upper layer.
1183 */
1184         if (cprot && cprot -> pops) {
1185                 int ret = cprot -> pops -> encap_and_xmit ( cprot , skb);
1186
1187                 if (ret)
1188                         netif_stop_queue(ndev);
1189                 return ret;
1190         } else
1191 #endif
1192         /* auto-dialing xmit function */
1193         {
1194 #ifdef ISDN_DEBUG_NET_DUMP
1195                 u_char *buf;
1196 #endif
1197                 isdn_net_adjust_hdr(skb, ndev);
1198 #ifdef ISDN_DEBUG_NET_DUMP
1199                 buf = skb->data;
1200                 isdn_dumppkt("S:", buf, skb->len, 40);
1201 #endif
1202
1203                 if (!(lp->flags & ISDN_NET_CONNECTED)) {
1204                         int chi;
1205                         /* only do autodial if allowed by config */
1206                         if (!(ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_AUTO)) {
1207                                 isdn_net_unreachable(ndev, skb, "dial rejected: interface not in dialmode `auto'");
1208                                 dev_kfree_skb(skb);
1209                                 return 0;
1210                         }
1211                         if (lp->phone[1]) {
1212                                 ulong flags;
1213
1214                                 if(lp->dialwait_timer <= 0)
1215                                         if(lp->dialstarted > 0 && lp->dialtimeout > 0 && time_before(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait))
1216                                                 lp->dialwait_timer = lp->dialstarted + lp->dialtimeout + lp->dialwait;
1217
1218                                 if(lp->dialwait_timer > 0) {
1219                                         if(time_before(jiffies, lp->dialwait_timer)) {
1220                                                 isdn_net_unreachable(ndev, skb, "dial rejected: retry-time not reached");
1221                                                 dev_kfree_skb(skb);
1222                                                 return 0;
1223                                         } else
1224                                                 lp->dialwait_timer = 0;
1225                                 }
1226                                 /* Grab a free ISDN-Channel */
1227                                 spin_lock_irqsave(&dev->lock, flags);
1228                                 if (((chi =
1229                                      isdn_get_free_channel(
1230                                                         ISDN_USAGE_NET,
1231                                                         lp->l2_proto,
1232                                                         lp->l3_proto,
1233                                                         lp->pre_device,
1234                                                         lp->pre_channel,
1235                                                         lp->msn)
1236                                                         ) < 0) &&
1237                                         ((chi =
1238                                      isdn_get_free_channel(
1239                                                         ISDN_USAGE_NET,
1240                                                         lp->l2_proto,
1241                                                         lp->l3_proto,
1242                                                         lp->pre_device,
1243                                                         lp->pre_channel^1,
1244                                                         lp->msn)
1245                                                         ) < 0)) {
1246                                         spin_unlock_irqrestore(&dev->lock, flags);
1247                                         isdn_net_unreachable(ndev, skb,
1248                                                            "No channel");
1249                                         dev_kfree_skb(skb);
1250                                         return 0;
1251                                 }
1252                                 /* Log packet, which triggered dialing */
1253                                 if (dev->net_verbose)
1254                                         isdn_net_log_skb(skb, lp);
1255                                 lp->dialstate = 1;
1256                                 /* Connect interface with channel */
1257                                 isdn_net_bind_channel(lp, chi);
1258 #ifdef CONFIG_ISDN_PPP
1259                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
1260                                         /* no 'first_skb' handling for syncPPP */
1261                                         if (isdn_ppp_bind(lp) < 0) {
1262                                                 dev_kfree_skb(skb);
1263                                                 isdn_net_unbind_channel(lp);
1264                                                 spin_unlock_irqrestore(&dev->lock, flags);
1265                                                 return 0;       /* STN (skb to nirvana) ;) */
1266                                         }
1267 #ifdef CONFIG_IPPP_FILTER
1268                                         if (isdn_ppp_autodial_filter(skb, lp)) {
1269                                                 isdn_ppp_free(lp);
1270                                                 isdn_net_unbind_channel(lp);
1271                                                 spin_unlock_irqrestore(&dev->lock, flags);
1272                                                 isdn_net_unreachable(ndev, skb, "dial rejected: packet filtered");
1273                                                 dev_kfree_skb(skb);
1274                                                 return 0;
1275                                         }
1276 #endif
1277                                         spin_unlock_irqrestore(&dev->lock, flags);
1278                                         isdn_net_dial();        /* Initiate dialing */
1279                                         netif_stop_queue(ndev);
1280                                         return 1;       /* let upper layer requeue skb packet */
1281                                 }
1282 #endif
1283                                 /* Initiate dialing */
1284                                 spin_unlock_irqrestore(&dev->lock, flags);
1285                                 isdn_net_dial();
1286                                 isdn_net_device_stop_queue(lp);
1287                                 return 1;
1288                         } else {
1289                                 isdn_net_unreachable(ndev, skb,
1290                                                      "No phone number");
1291                                 dev_kfree_skb(skb);
1292                                 return 0;
1293                         }
1294                 } else {
1295                         /* Device is connected to an ISDN channel */
1296                         ndev->trans_start = jiffies;
1297                         if (!lp->dialstate) {
1298                                 /* ISDN connection is established, try sending */
1299                                 int ret;
1300                                 ret = (isdn_net_xmit(ndev, skb));
1301                                 if(ret) netif_stop_queue(ndev);
1302                                 return ret;
1303                         } else
1304                                 netif_stop_queue(ndev);
1305                 }
1306         }
1307         return 1;
1308 }
1309
1310 /*
1311  * Shutdown a net-interface.
1312  */
1313 static int
1314 isdn_net_close(struct net_device *dev)
1315 {
1316         struct net_device *p;
1317 #ifdef CONFIG_ISDN_X25
1318         struct concap_proto * cprot =
1319                 ( (isdn_net_local *) dev->priv ) -> netdev -> cprot;
1320         /* printk(KERN_DEBUG "isdn_net_close %s\n" , dev-> name ); */
1321 #endif
1322
1323 #ifdef CONFIG_ISDN_X25
1324         if( cprot && cprot -> pops ) cprot -> pops -> close( cprot );
1325 #endif
1326         netif_stop_queue(dev);
1327         if ((p = (((isdn_net_local *) dev->priv)->slave))) {
1328                 /* If this interface has slaves, stop them also */
1329                 while (p) {
1330 #ifdef CONFIG_ISDN_X25
1331                         cprot = ( (isdn_net_local *) p->priv )
1332                                 -> netdev -> cprot;
1333                         if( cprot && cprot -> pops )
1334                                 cprot -> pops -> close( cprot );
1335 #endif
1336                         isdn_net_hangup(p);
1337                         p = (((isdn_net_local *) p->priv)->slave);
1338                 }
1339         }
1340         isdn_net_hangup(dev);
1341         isdn_unlock_drivers();
1342         return 0;
1343 }
1344
1345 /*
1346  * Get statistics
1347  */
1348 static struct net_device_stats *
1349 isdn_net_get_stats(struct net_device *dev)
1350 {
1351         isdn_net_local *lp = (isdn_net_local *) dev->priv;
1352         return &lp->stats;
1353 }
1354
1355 /*      This is simply a copy from std. eth.c EXCEPT we pull ETH_HLEN
1356  *      instead of dev->hard_header_len off. This is done because the
1357  *      lowlevel-driver has already pulled off its stuff when we get
1358  *      here and this routine only gets called with p_encap == ETHER.
1359  *      Determine the packet's protocol ID. The rule here is that we
1360  *      assume 802.3 if the type field is short enough to be a length.
1361  *      This is normal practice and works for any 'now in use' protocol.
1362  */
1363
1364 static unsigned short
1365 isdn_net_type_trans(struct sk_buff *skb, struct net_device *dev)
1366 {
1367         struct ethhdr *eth;
1368         unsigned char *rawp;
1369
1370         skb->mac.raw = skb->data;
1371         skb_pull(skb, ETH_HLEN);
1372         eth = eth_hdr(skb);
1373
1374         if (*eth->h_dest & 1) {
1375                 if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0)
1376                         skb->pkt_type = PACKET_BROADCAST;
1377                 else
1378                         skb->pkt_type = PACKET_MULTICAST;
1379         }
1380         /*
1381          *      This ALLMULTI check should be redundant by 1.4
1382          *      so don't forget to remove it.
1383          */
1384
1385         else if (dev->flags & (IFF_PROMISC /*| IFF_ALLMULTI*/)) {
1386                 if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN))
1387                         skb->pkt_type = PACKET_OTHERHOST;
1388         }
1389         if (ntohs(eth->h_proto) >= 1536)
1390                 return eth->h_proto;
1391
1392         rawp = skb->data;
1393
1394         /*
1395          *      This is a magic hack to spot IPX packets. Older Novell breaks
1396          *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
1397          *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
1398          *      won't work for fault tolerant netware but does for the rest.
1399          */
1400         if (*(unsigned short *) rawp == 0xFFFF)
1401                 return htons(ETH_P_802_3);
1402         /*
1403          *      Real 802.2 LLC
1404          */
1405         return htons(ETH_P_802_2);
1406 }
1407
1408
1409 /*
1410  * CISCO HDLC keepalive specific stuff
1411  */
1412 static struct sk_buff*
1413 isdn_net_ciscohdlck_alloc_skb(isdn_net_local *lp, int len)
1414 {
1415         unsigned short hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
1416         struct sk_buff *skb;
1417
1418         skb = alloc_skb(hl + len, GFP_ATOMIC);
1419         if (skb)
1420                 skb_reserve(skb, hl);
1421         else
1422                 printk("isdn out of mem at %s:%d!\n", __FILE__, __LINE__);
1423         return skb;
1424 }
1425
1426 /* cisco hdlck device private ioctls */
1427 static int
1428 isdn_ciscohdlck_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1429 {
1430         isdn_net_local *lp = (isdn_net_local *) dev->priv;
1431         unsigned long len = 0;
1432         unsigned long expires = 0;
1433         int tmp = 0;
1434         int period = lp->cisco_keepalive_period;
1435         s8 debserint = lp->cisco_debserint;
1436         int rc = 0;
1437
1438         if (lp->p_encap != ISDN_NET_ENCAP_CISCOHDLCK)
1439                 return -EINVAL;
1440
1441         switch (cmd) {
1442                 /* get/set keepalive period */
1443                 case SIOCGKEEPPERIOD:
1444                         len = (unsigned long)sizeof(lp->cisco_keepalive_period);
1445                         if (copy_to_user(ifr->ifr_data,
1446                                 &lp->cisco_keepalive_period, len))
1447                                 rc = -EFAULT;
1448                         break;
1449                 case SIOCSKEEPPERIOD:
1450                         tmp = lp->cisco_keepalive_period;
1451                         len = (unsigned long)sizeof(lp->cisco_keepalive_period);
1452                         if (copy_from_user(&period, ifr->ifr_data, len))
1453                                 rc = -EFAULT;
1454                         if ((period > 0) && (period <= 32767))
1455                                 lp->cisco_keepalive_period = period;
1456                         else
1457                                 rc = -EINVAL;
1458                         if (!rc && (tmp != lp->cisco_keepalive_period)) {
1459                                 expires = (unsigned long)(jiffies +
1460                                         lp->cisco_keepalive_period * HZ);
1461                                 mod_timer(&lp->cisco_timer, expires);
1462                                 printk(KERN_INFO "%s: Keepalive period set "
1463                                         "to %d seconds.\n",
1464                                         lp->name, lp->cisco_keepalive_period);
1465                         }
1466                         break;
1467
1468                 /* get/set debugging */
1469                 case SIOCGDEBSERINT:
1470                         len = (unsigned long)sizeof(lp->cisco_debserint);
1471                         if (copy_to_user(ifr->ifr_data,
1472                                 &lp->cisco_debserint, len))
1473                                 rc = -EFAULT;
1474                         break;
1475                 case SIOCSDEBSERINT:
1476                         len = (unsigned long)sizeof(lp->cisco_debserint);
1477                         if (copy_from_user(&debserint,
1478                                 ifr->ifr_data, len))
1479                                 rc = -EFAULT;
1480                         if ((debserint >= 0) && (debserint <= 64))
1481                                 lp->cisco_debserint = debserint;
1482                         else
1483                                 rc = -EINVAL;
1484                         break;
1485
1486                 default:
1487                         rc = -EINVAL;
1488                         break;
1489         }
1490         return (rc);
1491 }
1492
1493 /* called via cisco_timer.function */
1494 static void
1495 isdn_net_ciscohdlck_slarp_send_keepalive(unsigned long data)
1496 {
1497         isdn_net_local *lp = (isdn_net_local *) data;
1498         struct sk_buff *skb;
1499         unsigned char *p;
1500         unsigned long last_cisco_myseq = lp->cisco_myseq;
1501         int myseq_diff = 0;
1502
1503         if (!(lp->flags & ISDN_NET_CONNECTED) || lp->dialstate) {
1504                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1505                 return;
1506         }
1507         lp->cisco_myseq++;
1508
1509         myseq_diff = (lp->cisco_myseq - lp->cisco_mineseen);
1510         if ((lp->cisco_line_state) && ((myseq_diff >= 3)||(myseq_diff <= -3))) {
1511                 /* line up -> down */
1512                 lp->cisco_line_state = 0;
1513                 printk (KERN_WARNING
1514                                 "UPDOWN: Line protocol on Interface %s,"
1515                                 " changed state to down\n", lp->name);
1516                 /* should stop routing higher-level data accross */
1517         } else if ((!lp->cisco_line_state) &&
1518                 (myseq_diff >= 0) && (myseq_diff <= 2)) {
1519                 /* line down -> up */
1520                 lp->cisco_line_state = 1;
1521                 printk (KERN_WARNING
1522                                 "UPDOWN: Line protocol on Interface %s,"
1523                                 " changed state to up\n", lp->name);
1524                 /* restart routing higher-level data accross */
1525         }
1526
1527         if (lp->cisco_debserint)
1528                 printk (KERN_DEBUG "%s: HDLC "
1529                         "myseq %lu, mineseen %lu%c, yourseen %lu, %s\n",
1530                         lp->name, last_cisco_myseq, lp->cisco_mineseen,
1531                         ((last_cisco_myseq == lp->cisco_mineseen) ? '*' : 040),
1532                         lp->cisco_yourseq,
1533                         ((lp->cisco_line_state) ? "line up" : "line down"));
1534
1535         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1536         if (!skb)
1537                 return;
1538
1539         p = skb_put(skb, 4 + 14);
1540
1541         /* cisco header */
1542         p += put_u8 (p, CISCO_ADDR_UNICAST);
1543         p += put_u8 (p, CISCO_CTRL);
1544         p += put_u16(p, CISCO_TYPE_SLARP);
1545
1546         /* slarp keepalive */
1547         p += put_u32(p, CISCO_SLARP_KEEPALIVE);
1548         p += put_u32(p, lp->cisco_myseq);
1549         p += put_u32(p, lp->cisco_yourseq);
1550         p += put_u16(p, 0xffff); // reliablity, always 0xffff
1551
1552         isdn_net_write_super(lp, skb);
1553
1554         lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ;
1555
1556         add_timer(&lp->cisco_timer);
1557 }
1558
1559 static void
1560 isdn_net_ciscohdlck_slarp_send_request(isdn_net_local *lp)
1561 {
1562         struct sk_buff *skb;
1563         unsigned char *p;
1564
1565         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1566         if (!skb)
1567                 return;
1568
1569         p = skb_put(skb, 4 + 14);
1570
1571         /* cisco header */
1572         p += put_u8 (p, CISCO_ADDR_UNICAST);
1573         p += put_u8 (p, CISCO_CTRL);
1574         p += put_u16(p, CISCO_TYPE_SLARP);
1575
1576         /* slarp request */
1577         p += put_u32(p, CISCO_SLARP_REQUEST);
1578         p += put_u32(p, 0); // address
1579         p += put_u32(p, 0); // netmask
1580         p += put_u16(p, 0); // unused
1581
1582         isdn_net_write_super(lp, skb);
1583 }
1584
1585 static void
1586 isdn_net_ciscohdlck_connected(isdn_net_local *lp)
1587 {
1588         lp->cisco_myseq = 0;
1589         lp->cisco_mineseen = 0;
1590         lp->cisco_yourseq = 0;
1591         lp->cisco_keepalive_period = ISDN_TIMER_KEEPINT;
1592         lp->cisco_last_slarp_in = 0;
1593         lp->cisco_line_state = 0;
1594         lp->cisco_debserint = 0;
1595
1596         /* send slarp request because interface/seq.no.s reset */
1597         isdn_net_ciscohdlck_slarp_send_request(lp);
1598
1599         init_timer(&lp->cisco_timer);
1600         lp->cisco_timer.data = (unsigned long) lp;
1601         lp->cisco_timer.function = isdn_net_ciscohdlck_slarp_send_keepalive;
1602         lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ;
1603         add_timer(&lp->cisco_timer);
1604 }
1605
1606 static void
1607 isdn_net_ciscohdlck_disconnected(isdn_net_local *lp)
1608 {
1609         del_timer(&lp->cisco_timer);
1610 }
1611
1612 static void
1613 isdn_net_ciscohdlck_slarp_send_reply(isdn_net_local *lp)
1614 {
1615         struct sk_buff *skb;
1616         unsigned char *p;
1617         struct in_device *in_dev = NULL;
1618         u32 addr = 0;           /* local ipv4 address */
1619         u32 mask = 0;           /* local netmask */
1620
1621         if ((in_dev = lp->netdev->dev.ip_ptr) != NULL) {
1622                 /* take primary(first) address of interface */
1623                 struct in_ifaddr *ifa = in_dev->ifa_list;
1624                 if (ifa != NULL) {
1625                         addr = ifa->ifa_local;
1626                         mask = ifa->ifa_mask;
1627                 }
1628         }
1629
1630         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1631         if (!skb)
1632                 return;
1633
1634         p = skb_put(skb, 4 + 14);
1635
1636         /* cisco header */
1637         p += put_u8 (p, CISCO_ADDR_UNICAST);
1638         p += put_u8 (p, CISCO_CTRL);
1639         p += put_u16(p, CISCO_TYPE_SLARP);
1640
1641         /* slarp reply, send own ip/netmask; if values are nonsense remote
1642          * should think we are unable to provide it with an address via SLARP */
1643         p += put_u32(p, CISCO_SLARP_REPLY);
1644         p += put_u32(p, addr);  // address
1645         p += put_u32(p, mask);  // netmask
1646         p += put_u16(p, 0);     // unused
1647
1648         isdn_net_write_super(lp, skb);
1649 }
1650
1651 static void
1652 isdn_net_ciscohdlck_slarp_in(isdn_net_local *lp, struct sk_buff *skb)
1653 {
1654         unsigned char *p;
1655         int period;
1656         u32 code;
1657         u32 my_seq, addr;
1658         u32 your_seq, mask;
1659         u32 local;
1660         u16 unused;
1661
1662         if (skb->len < 14)
1663                 return;
1664
1665         p = skb->data;
1666         p += get_u32(p, &code);
1667
1668         switch (code) {
1669         case CISCO_SLARP_REQUEST:
1670                 lp->cisco_yourseq = 0;
1671                 isdn_net_ciscohdlck_slarp_send_reply(lp);
1672                 break;
1673         case CISCO_SLARP_REPLY:
1674                 addr = ntohl(*(u32 *)p);
1675                 mask = ntohl(*(u32 *)(p+4));
1676                 if (mask != 0xfffffffc)
1677                         goto slarp_reply_out;
1678                 if ((addr & 3) == 0 || (addr & 3) == 3)
1679                         goto slarp_reply_out;
1680                 local = addr ^ 3;
1681                 printk(KERN_INFO "%s: got slarp reply: "
1682                         "remote ip: %d.%d.%d.%d, "
1683                         "local ip: %d.%d.%d.%d "
1684                         "mask: %d.%d.%d.%d\n",
1685                        lp->name,
1686                        HIPQUAD(addr),
1687                        HIPQUAD(local),
1688                        HIPQUAD(mask));
1689                 break;
1690   slarp_reply_out:
1691                  printk(KERN_INFO "%s: got invalid slarp "
1692                                  "reply (%d.%d.%d.%d/%d.%d.%d.%d) "
1693                                  "- ignored\n", lp->name,
1694                                  HIPQUAD(addr), HIPQUAD(mask));
1695                 break;
1696         case CISCO_SLARP_KEEPALIVE:
1697                 period = (int)((jiffies - lp->cisco_last_slarp_in
1698                                 + HZ/2 - 1) / HZ);
1699                 if (lp->cisco_debserint &&
1700                                 (period != lp->cisco_keepalive_period) &&
1701                                 lp->cisco_last_slarp_in) {
1702                         printk(KERN_DEBUG "%s: Keepalive period mismatch - "
1703                                 "is %d but should be %d.\n",
1704                                 lp->name, period, lp->cisco_keepalive_period);
1705                 }
1706                 lp->cisco_last_slarp_in = jiffies;
1707                 p += get_u32(p, &my_seq);
1708                 p += get_u32(p, &your_seq);
1709                 p += get_u16(p, &unused);
1710                 lp->cisco_yourseq = my_seq;
1711                 lp->cisco_mineseen = your_seq;
1712                 break;
1713         }
1714 }
1715
1716 static void
1717 isdn_net_ciscohdlck_receive(isdn_net_local *lp, struct sk_buff *skb)
1718 {
1719         unsigned char *p;
1720         u8 addr;
1721         u8 ctrl;
1722         u16 type;
1723
1724         if (skb->len < 4)
1725                 goto out_free;
1726
1727         p = skb->data;
1728         p += get_u8 (p, &addr);
1729         p += get_u8 (p, &ctrl);
1730         p += get_u16(p, &type);
1731         skb_pull(skb, 4);
1732
1733         if (addr != CISCO_ADDR_UNICAST && addr != CISCO_ADDR_BROADCAST) {
1734                 printk(KERN_WARNING "%s: Unknown Cisco addr 0x%02x\n",
1735                        lp->name, addr);
1736                 goto out_free;
1737         }
1738         if (ctrl != CISCO_CTRL) {
1739                 printk(KERN_WARNING "%s: Unknown Cisco ctrl 0x%02x\n",
1740                        lp->name, ctrl);
1741                 goto out_free;
1742         }
1743
1744         switch (type) {
1745         case CISCO_TYPE_SLARP:
1746                 isdn_net_ciscohdlck_slarp_in(lp, skb);
1747                 goto out_free;
1748         case CISCO_TYPE_CDP:
1749                 if (lp->cisco_debserint)
1750                         printk(KERN_DEBUG "%s: Received CDP packet. use "
1751                                 "\"no cdp enable\" on cisco.\n", lp->name);
1752                 goto out_free;
1753         default:
1754                 /* no special cisco protocol */
1755                 skb->protocol = htons(type);
1756                 netif_rx(skb);
1757                 return;
1758         }
1759
1760  out_free:
1761         kfree_skb(skb);
1762 }
1763
1764 /*
1765  * Got a packet from ISDN-Channel.
1766  */
1767 static void
1768 isdn_net_receive(struct net_device *ndev, struct sk_buff *skb)
1769 {
1770         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
1771         isdn_net_local *olp = lp;       /* original 'lp' */
1772 #ifdef CONFIG_ISDN_X25
1773         struct concap_proto *cprot = lp -> netdev -> cprot;
1774 #endif
1775         lp->transcount += skb->len;
1776
1777         lp->stats.rx_packets++;
1778         lp->stats.rx_bytes += skb->len;
1779         if (lp->master) {
1780                 /* Bundling: If device is a slave-device, deliver to master, also
1781                  * handle master's statistics and hangup-timeout
1782                  */
1783                 ndev = lp->master;
1784                 lp = (isdn_net_local *) ndev->priv;
1785                 lp->stats.rx_packets++;
1786                 lp->stats.rx_bytes += skb->len;
1787         }
1788         skb->dev = ndev;
1789         skb->pkt_type = PACKET_HOST;
1790         skb->mac.raw = skb->data;
1791 #ifdef ISDN_DEBUG_NET_DUMP
1792         isdn_dumppkt("R:", skb->data, skb->len, 40);
1793 #endif
1794         switch (lp->p_encap) {
1795                 case ISDN_NET_ENCAP_ETHER:
1796                         /* Ethernet over ISDN */
1797                         olp->huptimer = 0;
1798                         lp->huptimer = 0;
1799                         skb->protocol = isdn_net_type_trans(skb, ndev);
1800                         break;
1801                 case ISDN_NET_ENCAP_UIHDLC:
1802                         /* HDLC with UI-frame (for ispa with -h1 option) */
1803                         olp->huptimer = 0;
1804                         lp->huptimer = 0;
1805                         skb_pull(skb, 2);
1806                         /* Fall through */
1807                 case ISDN_NET_ENCAP_RAWIP:
1808                         /* RAW-IP without MAC-Header */
1809                         olp->huptimer = 0;
1810                         lp->huptimer = 0;
1811                         skb->protocol = htons(ETH_P_IP);
1812                         break;
1813                 case ISDN_NET_ENCAP_CISCOHDLCK:
1814                         isdn_net_ciscohdlck_receive(lp, skb);
1815                         return;
1816                 case ISDN_NET_ENCAP_CISCOHDLC:
1817                         /* CISCO-HDLC IP with type field and  fake I-frame-header */
1818                         skb_pull(skb, 2);
1819                         /* Fall through */
1820                 case ISDN_NET_ENCAP_IPTYP:
1821                         /* IP with type field */
1822                         olp->huptimer = 0;
1823                         lp->huptimer = 0;
1824                         skb->protocol = *(unsigned short *) &(skb->data[0]);
1825                         skb_pull(skb, 2);
1826                         if (*(unsigned short *) skb->data == 0xFFFF)
1827                                 skb->protocol = htons(ETH_P_802_3);
1828                         break;
1829 #ifdef CONFIG_ISDN_PPP
1830                 case ISDN_NET_ENCAP_SYNCPPP:
1831                         /* huptimer is done in isdn_ppp_push_higher */
1832                         isdn_ppp_receive(lp->netdev, olp, skb);
1833                         return;
1834 #endif
1835
1836                 default:
1837 #ifdef CONFIG_ISDN_X25
1838                   /* try if there are generic sync_device receiver routines */
1839                         if(cprot) if(cprot -> pops)
1840                                 if( cprot -> pops -> data_ind){
1841                                         cprot -> pops -> data_ind(cprot,skb);
1842                                         return;
1843                                 };
1844 #endif /* CONFIG_ISDN_X25 */
1845                         printk(KERN_WARNING "%s: unknown encapsulation, dropping\n",
1846                                lp->name);
1847                         kfree_skb(skb);
1848                         return;
1849         }
1850
1851         netif_rx(skb);
1852         return;
1853 }
1854
1855 /*
1856  * A packet arrived via ISDN. Search interface-chain for a corresponding
1857  * interface. If found, deliver packet to receiver-function and return 1,
1858  * else return 0.
1859  */
1860 int
1861 isdn_net_rcv_skb(int idx, struct sk_buff *skb)
1862 {
1863         isdn_net_dev *p = dev->rx_netdev[idx];
1864
1865         if (p) {
1866                 isdn_net_local *lp = p->local;
1867                 if ((lp->flags & ISDN_NET_CONNECTED) &&
1868                     (!lp->dialstate)) {
1869                         isdn_net_receive(&p->dev, skb);
1870                         return 1;
1871                 }
1872         }
1873         return 0;
1874 }
1875
1876 static int
1877 my_eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
1878               void *daddr, void *saddr, unsigned len)
1879 {
1880         struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
1881
1882         /*
1883          * Set the protocol type. For a packet of type ETH_P_802_3 we
1884          * put the length here instead. It is up to the 802.2 layer to
1885          * carry protocol information.
1886          */
1887
1888         if (type != ETH_P_802_3)
1889                 eth->h_proto = htons(type);
1890         else
1891                 eth->h_proto = htons(len);
1892
1893         /*
1894          * Set the source hardware address.
1895          */
1896         if (saddr)
1897                 memcpy(eth->h_source, saddr, dev->addr_len);
1898         else
1899                 memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
1900
1901         /*
1902          * Anyway, the loopback-device should never use this function...
1903          */
1904
1905         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
1906                 memset(eth->h_dest, 0, dev->addr_len);
1907                 return ETH_HLEN /*(dev->hard_header_len)*/;
1908         }
1909         if (daddr) {
1910                 memcpy(eth->h_dest, daddr, dev->addr_len);
1911                 return ETH_HLEN /*dev->hard_header_len*/;
1912         }
1913         return -ETH_HLEN /*dev->hard_header_len*/;
1914 }
1915
1916 /*
1917  *  build an header
1918  *  depends on encaps that is being used.
1919  */
1920
1921 static int
1922 isdn_net_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
1923                 void *daddr, void *saddr, unsigned plen)
1924 {
1925         isdn_net_local *lp = dev->priv;
1926         unsigned char *p;
1927         ushort len = 0;
1928
1929         switch (lp->p_encap) {
1930                 case ISDN_NET_ENCAP_ETHER:
1931                         len = my_eth_header(skb, dev, type, daddr, saddr, plen);
1932                         break;
1933 #ifdef CONFIG_ISDN_PPP
1934                 case ISDN_NET_ENCAP_SYNCPPP:
1935                         /* stick on a fake header to keep fragmentation code happy. */
1936                         len = IPPP_MAX_HEADER;
1937                         skb_push(skb,len);
1938                         break;
1939 #endif
1940                 case ISDN_NET_ENCAP_RAWIP:
1941                         printk(KERN_WARNING "isdn_net_header called with RAW_IP!\n");
1942                         len = 0;
1943                         break;
1944                 case ISDN_NET_ENCAP_IPTYP:
1945                         /* ethernet type field */
1946                         *((ushort *) skb_push(skb, 2)) = htons(type);
1947                         len = 2;
1948                         break;
1949                 case ISDN_NET_ENCAP_UIHDLC:
1950                         /* HDLC with UI-Frames (for ispa with -h1 option) */
1951                         *((ushort *) skb_push(skb, 2)) = htons(0x0103);
1952                         len = 2;
1953                         break;
1954                 case ISDN_NET_ENCAP_CISCOHDLC:
1955                 case ISDN_NET_ENCAP_CISCOHDLCK:
1956                         p = skb_push(skb, 4);
1957                         p += put_u8 (p, CISCO_ADDR_UNICAST);
1958                         p += put_u8 (p, CISCO_CTRL);
1959                         p += put_u16(p, type);
1960                         len = 4;
1961                         break;
1962 #ifdef CONFIG_ISDN_X25
1963                 default:
1964                   /* try if there are generic concap protocol routines */
1965                         if( lp-> netdev -> cprot ){
1966                                 printk(KERN_WARNING "isdn_net_header called with concap_proto!\n");
1967                                 len = 0;
1968                                 break;
1969                         }
1970                         break;
1971 #endif /* CONFIG_ISDN_X25 */
1972         }
1973         return len;
1974 }
1975
1976 /* We don't need to send arp, because we have point-to-point connections. */
1977 static int
1978 isdn_net_rebuild_header(struct sk_buff *skb)
1979 {
1980         struct net_device *dev = skb->dev;
1981         isdn_net_local *lp = dev->priv;
1982         int ret = 0;
1983
1984         if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
1985                 struct ethhdr *eth = (struct ethhdr *) skb->data;
1986
1987                 /*
1988                  *      Only ARP/IP is currently supported
1989                  */
1990
1991                 if (eth->h_proto != htons(ETH_P_IP)) {
1992                         printk(KERN_WARNING
1993                                "isdn_net: %s don't know how to resolve type %d addresses?\n",
1994                                dev->name, (int) eth->h_proto);
1995                         memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
1996                         return 0;
1997                 }
1998                 /*
1999                  *      Try to get ARP to resolve the header.
2000                  */
2001 #ifdef CONFIG_INET
2002                 ret = arp_find(eth->h_dest, skb);
2003 #endif
2004         }
2005         return ret;
2006 }
2007
2008 /*
2009  * Interface-setup. (just after registering a new interface)
2010  */
2011 static int
2012 isdn_net_init(struct net_device *ndev)
2013 {
2014         ushort max_hlhdr_len = 0;
2015         isdn_net_local *lp = (isdn_net_local *) ndev->priv;
2016         int drvidx, i;
2017
2018         ether_setup(ndev);
2019         lp->org_hhc = ndev->hard_header_cache;
2020         lp->org_hcu = ndev->header_cache_update;
2021
2022         /* Setup the generic properties */
2023
2024         ndev->hard_header = NULL;
2025         ndev->hard_header_cache = NULL;
2026         ndev->header_cache_update = NULL;
2027         ndev->mtu = 1500;
2028         ndev->flags = IFF_NOARP|IFF_POINTOPOINT;
2029         ndev->type = ARPHRD_ETHER;
2030         ndev->addr_len = ETH_ALEN;
2031
2032         /* for clients with MPPP maybe higher values better */
2033         ndev->tx_queue_len = 30;
2034
2035         for (i = 0; i < ETH_ALEN; i++)
2036                 ndev->broadcast[i] = 0xff;
2037
2038         /* The ISDN-specific entries in the device structure. */
2039         ndev->open = &isdn_net_open;
2040         ndev->hard_start_xmit = &isdn_net_start_xmit;
2041
2042         /*
2043          *  up till binding we ask the protocol layer to reserve as much
2044          *  as we might need for HL layer
2045          */
2046
2047         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2048                 if (dev->drv[drvidx])
2049                         if (max_hlhdr_len < dev->drv[drvidx]->interface->hl_hdrlen)
2050                                 max_hlhdr_len = dev->drv[drvidx]->interface->hl_hdrlen;
2051
2052         ndev->hard_header_len = ETH_HLEN + max_hlhdr_len;
2053         ndev->stop = &isdn_net_close;
2054         ndev->get_stats = &isdn_net_get_stats;
2055         ndev->rebuild_header = &isdn_net_rebuild_header;
2056         ndev->do_ioctl = NULL;
2057         return 0;
2058 }
2059
2060 static void
2061 isdn_net_swapbind(int drvidx)
2062 {
2063         isdn_net_dev *p;
2064
2065 #ifdef ISDN_DEBUG_NET_ICALL
2066         printk(KERN_DEBUG "n_fi: swapping ch of %d\n", drvidx);
2067 #endif
2068         p = dev->netdev;
2069         while (p) {
2070                 if (p->local->pre_device == drvidx)
2071                         switch (p->local->pre_channel) {
2072                                 case 0:
2073                                         p->local->pre_channel = 1;
2074                                         break;
2075                                 case 1:
2076                                         p->local->pre_channel = 0;
2077                                         break;
2078                         }
2079                 p = (isdn_net_dev *) p->next;
2080         }
2081 }
2082
2083 static void
2084 isdn_net_swap_usage(int i1, int i2)
2085 {
2086         int u1 = dev->usage[i1] & ISDN_USAGE_EXCLUSIVE;
2087         int u2 = dev->usage[i2] & ISDN_USAGE_EXCLUSIVE;
2088
2089 #ifdef ISDN_DEBUG_NET_ICALL
2090         printk(KERN_DEBUG "n_fi: usage of %d and %d\n", i1, i2);
2091 #endif
2092         dev->usage[i1] &= ~ISDN_USAGE_EXCLUSIVE;
2093         dev->usage[i1] |= u2;
2094         dev->usage[i2] &= ~ISDN_USAGE_EXCLUSIVE;
2095         dev->usage[i2] |= u1;
2096         isdn_info_update();
2097 }
2098
2099 /*
2100  * An incoming call-request has arrived.
2101  * Search the interface-chain for an appropriate interface.
2102  * If found, connect the interface to the ISDN-channel and initiate
2103  * D- and B-Channel-setup. If secure-flag is set, accept only
2104  * configured phone-numbers. If callback-flag is set, initiate
2105  * callback-dialing.
2106  *
2107  * Return-Value: 0 = No appropriate interface for this call.
2108  *               1 = Call accepted
2109  *               2 = Reject call, wait cbdelay, then call back
2110  *               3 = Reject call
2111  *               4 = Wait cbdelay, then call back
2112  *               5 = No appropriate interface for this call,
2113  *                   would eventually match if CID was longer.
2114  */
2115
2116 int
2117 isdn_net_find_icall(int di, int ch, int idx, setup_parm *setup)
2118 {
2119         char *eaz;
2120         int si1;
2121         int si2;
2122         int ematch;
2123         int wret;
2124         int swapped;
2125         int sidx = 0;
2126         u_long flags;
2127         isdn_net_dev *p;
2128         isdn_net_phone *n;
2129         char nr[32];
2130         char *my_eaz;
2131
2132         /* Search name in netdev-chain */
2133         if (!setup->phone[0]) {
2134                 nr[0] = '0';
2135                 nr[1] = '\0';
2136                 printk(KERN_INFO "isdn_net: Incoming call without OAD, assuming '0'\n");
2137         } else
2138                 strcpy(nr, setup->phone);
2139         si1 = (int) setup->si1;
2140         si2 = (int) setup->si2;
2141         if (!setup->eazmsn[0]) {
2142                 printk(KERN_WARNING "isdn_net: Incoming call without CPN, assuming '0'\n");
2143                 eaz = "0";
2144         } else
2145                 eaz = setup->eazmsn;
2146         if (dev->net_verbose > 1)
2147                 printk(KERN_INFO "isdn_net: call from %s,%d,%d -> %s\n", nr, si1, si2, eaz);
2148         /* Accept DATA and VOICE calls at this stage
2149          * local eaz is checked later for allowed call types
2150          */
2151         if ((si1 != 7) && (si1 != 1)) {
2152                 if (dev->net_verbose > 1)
2153                         printk(KERN_INFO "isdn_net: Service-Indicator not 1 or 7, ignored\n");
2154                 return 0;
2155         }
2156         n = (isdn_net_phone *) 0;
2157         p = dev->netdev;
2158         ematch = wret = swapped = 0;
2159 #ifdef ISDN_DEBUG_NET_ICALL
2160         printk(KERN_DEBUG "n_fi: di=%d ch=%d idx=%d usg=%d\n", di, ch, idx,
2161                 dev->usage[idx]);
2162 #endif
2163         while (p) {
2164                 int matchret;
2165                 isdn_net_local *lp = p->local;
2166
2167                 /* If last check has triggered as binding-swap, revert it */
2168                 switch (swapped) {
2169                         case 2:
2170                                 isdn_net_swap_usage(idx, sidx);
2171                                 /* fall through */
2172                         case 1:
2173                                 isdn_net_swapbind(di);
2174                                 break;
2175                 }
2176                 swapped = 0;
2177                 /* check acceptable call types for DOV */
2178                 my_eaz = isdn_map_eaz2msn(lp->msn, di);
2179                 if (si1 == 1) { /* it's a DOV call, check if we allow it */
2180                         if (*my_eaz == 'v' || *my_eaz == 'V' ||
2181                             *my_eaz == 'b' || *my_eaz == 'B')
2182                                 my_eaz++; /* skip to allow a match */
2183                         else
2184                                 my_eaz = NULL; /* force non match */
2185                 } else { /* it's a DATA call, check if we allow it */
2186                         if (*my_eaz == 'b' || *my_eaz == 'B')
2187                                 my_eaz++; /* skip to allow a match */
2188                 }
2189                 if (my_eaz)
2190                         matchret = isdn_msncmp(eaz, my_eaz);
2191                 else
2192                         matchret = 1;
2193                 if (!matchret)
2194                         ematch = 1;
2195
2196                 /* Remember if more numbers eventually can match */
2197                 if (matchret > wret)
2198                         wret = matchret;
2199 #ifdef ISDN_DEBUG_NET_ICALL
2200                 printk(KERN_DEBUG "n_fi: if='%s', l.msn=%s, l.flags=%d, l.dstate=%d\n",
2201                        lp->name, lp->msn, lp->flags, lp->dialstate);
2202 #endif
2203                 if ((!matchret) &&                                        /* EAZ is matching   */
2204                     (((!(lp->flags & ISDN_NET_CONNECTED)) &&              /* but not connected */
2205                       (USG_NONE(dev->usage[idx]))) ||                     /* and ch. unused or */
2206                      ((((lp->dialstate == 4) || (lp->dialstate == 12)) && /* if dialing        */
2207                        (!(lp->flags & ISDN_NET_CALLBACK)))                /* but no callback   */
2208                      )))
2209                          {
2210 #ifdef ISDN_DEBUG_NET_ICALL
2211                         printk(KERN_DEBUG "n_fi: match1, pdev=%d pch=%d\n",
2212                                lp->pre_device, lp->pre_channel);
2213 #endif
2214                         if (dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) {
2215                                 if ((lp->pre_channel != ch) ||
2216                                     (lp->pre_device != di)) {
2217                                         /* Here we got a problem:
2218                                          * If using an ICN-Card, an incoming call is always signaled on
2219                                          * on the first channel of the card, if both channels are
2220                                          * down. However this channel may be bound exclusive. If the
2221                                          * second channel is free, this call should be accepted.
2222                                          * The solution is horribly but it runs, so what:
2223                                          * We exchange the exclusive bindings of the two channels, the
2224                                          * corresponding variables in the interface-structs.
2225                                          */
2226                                         if (ch == 0) {
2227                                                 sidx = isdn_dc2minor(di, 1);
2228 #ifdef ISDN_DEBUG_NET_ICALL
2229                                                 printk(KERN_DEBUG "n_fi: ch is 0\n");
2230 #endif
2231                                                 if (USG_NONE(dev->usage[sidx])) {
2232                                                         /* Second Channel is free, now see if it is bound
2233                                                          * exclusive too. */
2234                                                         if (dev->usage[sidx] & ISDN_USAGE_EXCLUSIVE) {
2235 #ifdef ISDN_DEBUG_NET_ICALL
2236                                                                 printk(KERN_DEBUG "n_fi: 2nd channel is down and bound\n");
2237 #endif
2238                                                                 /* Yes, swap bindings only, if the original
2239                                                                  * binding is bound to channel 1 of this driver */
2240                                                                 if ((lp->pre_device == di) &&
2241                                                                     (lp->pre_channel == 1)) {
2242                                                                         isdn_net_swapbind(di);
2243                                                                         swapped = 1;
2244                                                                 } else {
2245                                                                         /* ... else iterate next device */
2246                                                                         p = (isdn_net_dev *) p->next;
2247                                                                         continue;
2248                                                                 }
2249                                                         } else {
2250 #ifdef ISDN_DEBUG_NET_ICALL
2251                                                                 printk(KERN_DEBUG "n_fi: 2nd channel is down and unbound\n");
2252 #endif
2253                                                                 /* No, swap always and swap excl-usage also */
2254                                                                 isdn_net_swap_usage(idx, sidx);
2255                                                                 isdn_net_swapbind(di);
2256                                                                 swapped = 2;
2257                                                         }
2258                                                         /* Now check for exclusive binding again */
2259 #ifdef ISDN_DEBUG_NET_ICALL
2260                                                         printk(KERN_DEBUG "n_fi: final check\n");
2261 #endif
2262                                                         if ((dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) &&
2263                                                             ((lp->pre_channel != ch) ||
2264                                                              (lp->pre_device != di))) {
2265 #ifdef ISDN_DEBUG_NET_ICALL
2266                                                                 printk(KERN_DEBUG "n_fi: final check failed\n");
2267 #endif
2268                                                                 p = (isdn_net_dev *) p->next;
2269                                                                 continue;
2270                                                         }
2271                                                 }
2272                                         } else {
2273                                                 /* We are already on the second channel, so nothing to do */
2274 #ifdef ISDN_DEBUG_NET_ICALL
2275                                                 printk(KERN_DEBUG "n_fi: already on 2nd channel\n");
2276 #endif
2277                                         }
2278                                 }
2279                         }
2280 #ifdef ISDN_DEBUG_NET_ICALL
2281                         printk(KERN_DEBUG "n_fi: match2\n");
2282 #endif
2283                         n = lp->phone[0];
2284                         if (lp->flags & ISDN_NET_SECURE) {
2285                                 while (n) {
2286                                         if (!isdn_msncmp(nr, n->num))
2287                                                 break;
2288                                         n = (isdn_net_phone *) n->next;
2289                                 }
2290                         }
2291                         if (n || (!(lp->flags & ISDN_NET_SECURE))) {
2292 #ifdef ISDN_DEBUG_NET_ICALL
2293                                 printk(KERN_DEBUG "n_fi: match3\n");
2294 #endif
2295                                 /* matching interface found */
2296
2297                                 /*
2298                                  * Is the state STOPPED?
2299                                  * If so, no dialin is allowed,
2300                                  * so reject actively.
2301                                  * */
2302                                 if (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF) {
2303                                         printk(KERN_INFO "incoming call, interface %s `stopped' -> rejected\n",
2304                                                lp->name);
2305                                         return 3;
2306                                 }
2307                                 /*
2308                                  * Is the interface up?
2309                                  * If not, reject the call actively.
2310                                  */
2311                                 if (!isdn_net_device_started(p)) {
2312                                         printk(KERN_INFO "%s: incoming call, interface down -> rejected\n",
2313                                                lp->name);
2314                                         return 3;
2315                                 }
2316                                 /* Interface is up, now see if it's a slave. If so, see if
2317                                  * it's master and parent slave is online. If not, reject the call.
2318                                  */
2319                                 if (lp->master) {
2320                                         isdn_net_local *mlp = (isdn_net_local *) lp->master->priv;
2321                                         printk(KERN_DEBUG "ICALLslv: %s\n", lp->name);
2322                                         printk(KERN_DEBUG "master=%s\n", mlp->name);
2323                                         if (mlp->flags & ISDN_NET_CONNECTED) {
2324                                                 printk(KERN_DEBUG "master online\n");
2325                                                 /* Master is online, find parent-slave (master if first slave) */
2326                                                 while (mlp->slave) {
2327                                                         if ((isdn_net_local *) mlp->slave->priv == lp)
2328                                                                 break;
2329                                                         mlp = (isdn_net_local *) mlp->slave->priv;
2330                                                 }
2331                                         } else
2332                                                 printk(KERN_DEBUG "master offline\n");
2333                                         /* Found parent, if it's offline iterate next device */
2334                                         printk(KERN_DEBUG "mlpf: %d\n", mlp->flags & ISDN_NET_CONNECTED);
2335                                         if (!(mlp->flags & ISDN_NET_CONNECTED)) {
2336                                                 p = (isdn_net_dev *) p->next;
2337                                                 continue;
2338                                         }
2339                                 }
2340                                 if (lp->flags & ISDN_NET_CALLBACK) {
2341                                         int chi;
2342                                         /*
2343                                          * Is the state MANUAL?
2344                                          * If so, no callback can be made,
2345                                          * so reject actively.
2346                                          * */
2347                                         if (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF) {
2348                                                 printk(KERN_INFO "incoming call for callback, interface %s `off' -> rejected\n",
2349                                                        lp->name);
2350                                                 return 3;
2351                                         }
2352                                         printk(KERN_DEBUG "%s: call from %s -> %s, start callback\n",
2353                                                lp->name, nr, eaz);
2354                                         if (lp->phone[1]) {
2355                                                 /* Grab a free ISDN-Channel */
2356                                                 spin_lock_irqsave(&dev->lock, flags);
2357                                                 if ((chi =
2358                                                         isdn_get_free_channel(
2359                                                                 ISDN_USAGE_NET,
2360                                                                 lp->l2_proto,
2361                                                                 lp->l3_proto,
2362                                                                 lp->pre_device,
2363                                                                 lp->pre_channel,
2364                                                                 lp->msn)
2365                                                                 ) < 0) {
2366
2367                                                         printk(KERN_WARNING "isdn_net_find_icall: No channel for %s\n", lp->name);
2368                                                         spin_unlock_irqrestore(&dev->lock, flags);
2369                                                         return 0;
2370                                                 }
2371                                                 /* Setup dialstate. */
2372                                                 lp->dtimer = 0;
2373                                                 lp->dialstate = 11;
2374                                                 /* Connect interface with channel */
2375                                                 isdn_net_bind_channel(lp, chi);
2376 #ifdef CONFIG_ISDN_PPP
2377                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2378                                                         if (isdn_ppp_bind(lp) < 0) {
2379                                                                 spin_unlock_irqrestore(&dev->lock, flags);
2380                                                                 isdn_net_unbind_channel(lp);
2381                                                                 return 0;
2382                                                         }
2383 #endif
2384                                                 spin_unlock_irqrestore(&dev->lock, flags);
2385                                                 /* Initiate dialing by returning 2 or 4 */
2386                                                 return (lp->flags & ISDN_NET_CBHUP) ? 2 : 4;
2387                                         } else
2388                                                 printk(KERN_WARNING "isdn_net: %s: No phone number\n", lp->name);
2389                                         return 0;
2390                                 } else {
2391                                         printk(KERN_DEBUG "%s: call from %s -> %s accepted\n", lp->name, nr,
2392                                                eaz);
2393                                         /* if this interface is dialing, it does it probably on a different
2394                                            device, so free this device */
2395                                         if ((lp->dialstate == 4) || (lp->dialstate == 12)) {
2396 #ifdef CONFIG_ISDN_PPP
2397                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2398                                                         isdn_ppp_free(lp);
2399 #endif
2400                                                 isdn_net_lp_disconnected(lp);
2401                                                 isdn_free_channel(lp->isdn_device, lp->isdn_channel,
2402                                                          ISDN_USAGE_NET);
2403                                         }
2404                                         spin_lock_irqsave(&dev->lock, flags);
2405                                         dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
2406                                         dev->usage[idx] |= ISDN_USAGE_NET;
2407                                         strcpy(dev->num[idx], nr);
2408                                         isdn_info_update();
2409                                         dev->st_netdev[idx] = lp->netdev;
2410                                         lp->isdn_device = di;
2411                                         lp->isdn_channel = ch;
2412                                         lp->ppp_slot = -1;
2413                                         lp->flags |= ISDN_NET_CONNECTED;
2414                                         lp->dialstate = 7;
2415                                         lp->dtimer = 0;
2416                                         lp->outgoing = 0;
2417                                         lp->huptimer = 0;
2418                                         lp->hupflags |= ISDN_WAITCHARGE;
2419                                         lp->hupflags &= ~ISDN_HAVECHARGE;
2420 #ifdef CONFIG_ISDN_PPP
2421                                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
2422                                                 if (isdn_ppp_bind(lp) < 0) {
2423                                                         isdn_net_unbind_channel(lp);
2424                                                         spin_unlock_irqrestore(&dev->lock, flags);
2425                                                         return 0;
2426                                                 }
2427                                         }
2428 #endif
2429                                         spin_unlock_irqrestore(&dev->lock, flags);
2430                                         return 1;
2431                                 }
2432                         }
2433                 }
2434                 p = (isdn_net_dev *) p->next;
2435         }
2436         /* If none of configured EAZ/MSN matched and not verbose, be silent */
2437         if (!ematch || dev->net_verbose)
2438                 printk(KERN_INFO "isdn_net: call from %s -> %d %s ignored\n", nr, di, eaz);
2439         return (wret == 2)?5:0;
2440 }
2441
2442 /*
2443  * Search list of net-interfaces for an interface with given name.
2444  */
2445 isdn_net_dev *
2446 isdn_net_findif(char *name)
2447 {
2448         isdn_net_dev *p = dev->netdev;
2449
2450         while (p) {
2451                 if (!strcmp(p->local->name, name))
2452                         return p;
2453                 p = (isdn_net_dev *) p->next;
2454         }
2455         return (isdn_net_dev *) NULL;
2456 }
2457
2458 /*
2459  * Force a net-interface to dial out.
2460  * This is called from the userlevel-routine below or
2461  * from isdn_net_start_xmit().
2462  */
2463 static int
2464 isdn_net_force_dial_lp(isdn_net_local * lp)
2465 {
2466         if ((!(lp->flags & ISDN_NET_CONNECTED)) && !lp->dialstate) {
2467                 int chi;
2468                 if (lp->phone[1]) {
2469                         ulong flags;
2470
2471                         /* Grab a free ISDN-Channel */
2472                         spin_lock_irqsave(&dev->lock, flags);
2473                         if ((chi = isdn_get_free_channel(
2474                                         ISDN_USAGE_NET,
2475                                         lp->l2_proto,
2476                                         lp->l3_proto,
2477                                         lp->pre_device,
2478                                         lp->pre_channel,
2479                                         lp->msn)) < 0) {
2480                                 printk(KERN_WARNING "isdn_net_force_dial: No channel for %s\n", lp->name);
2481                                 spin_unlock_irqrestore(&dev->lock, flags);
2482                                 return -EAGAIN;
2483                         }
2484                         lp->dialstate = 1;
2485                         /* Connect interface with channel */
2486                         isdn_net_bind_channel(lp, chi);
2487 #ifdef CONFIG_ISDN_PPP
2488                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2489                                 if (isdn_ppp_bind(lp) < 0) {
2490                                         isdn_net_unbind_channel(lp);
2491                                         spin_unlock_irqrestore(&dev->lock, flags);
2492                                         return -EAGAIN;
2493                                 }
2494 #endif
2495                         /* Initiate dialing */
2496                         spin_unlock_irqrestore(&dev->lock, flags);
2497                         isdn_net_dial();
2498                         return 0;
2499                 } else
2500                         return -EINVAL;
2501         } else
2502                 return -EBUSY;
2503 }
2504
2505 /*
2506  * This is called from certain upper protocol layers (multilink ppp
2507  * and x25iface encapsulation module) that want to initiate dialing
2508  * themselves.
2509  */
2510 int
2511 isdn_net_dial_req(isdn_net_local * lp)
2512 {
2513         /* is there a better error code? */
2514         if (!(ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_AUTO)) return -EBUSY;
2515
2516         return isdn_net_force_dial_lp(lp);
2517 }
2518
2519 /*
2520  * Force a net-interface to dial out.
2521  * This is always called from within userspace (ISDN_IOCTL_NET_DIAL).
2522  */
2523 int
2524 isdn_net_force_dial(char *name)
2525 {
2526         isdn_net_dev *p = isdn_net_findif(name);
2527
2528         if (!p)
2529                 return -ENODEV;
2530         return (isdn_net_force_dial_lp(p->local));
2531 }
2532
2533 /*
2534  * Allocate a new network-interface and initialize its data structures.
2535  */
2536 char *
2537 isdn_net_new(char *name, struct net_device *master)
2538 {
2539         isdn_net_dev *netdev;
2540
2541         /* Avoid creating an existing interface */
2542         if (isdn_net_findif(name)) {
2543                 printk(KERN_WARNING "isdn_net: interface %s already exists\n", name);
2544                 return NULL;
2545         }
2546         if (!(netdev = (isdn_net_dev *) kmalloc(sizeof(isdn_net_dev), GFP_KERNEL))) {
2547                 printk(KERN_WARNING "isdn_net: Could not allocate net-device\n");
2548                 return NULL;
2549         }
2550         memset(netdev, 0, sizeof(isdn_net_dev));
2551         if (!(netdev->local = (isdn_net_local *) kmalloc(sizeof(isdn_net_local), GFP_KERNEL))) {
2552                 printk(KERN_WARNING "isdn_net: Could not allocate device locals\n");
2553                 kfree(netdev);
2554                 return NULL;
2555         }
2556         memset(netdev->local, 0, sizeof(isdn_net_local));
2557         if (name == NULL)
2558                 strcpy(netdev->local->name, "         ");
2559         else
2560                 strcpy(netdev->local->name, name);
2561         strcpy(netdev->dev.name, netdev->local->name);
2562         netdev->dev.priv = netdev->local;
2563         netdev->dev.init = isdn_net_init;
2564         netdev->local->p_encap = ISDN_NET_ENCAP_RAWIP;
2565         if (master) {
2566                 /* Device shall be a slave */
2567                 struct net_device *p = (((isdn_net_local *) master->priv)->slave);
2568                 struct net_device *q = master;
2569
2570                 netdev->local->master = master;
2571                 /* Put device at end of slave-chain */
2572                 while (p) {
2573                         q = p;
2574                         p = (((isdn_net_local *) p->priv)->slave);
2575                 }
2576                 ((isdn_net_local *) q->priv)->slave = &(netdev->dev);
2577         } else {
2578                 /* Device shall be a master */
2579                 /*
2580                  * Watchdog timer (currently) for master only.
2581                  */
2582                 netdev->dev.tx_timeout = isdn_net_tx_timeout;
2583                 netdev->dev.watchdog_timeo = ISDN_NET_TX_TIMEOUT;
2584                 if (register_netdev(&netdev->dev) != 0) {
2585                         printk(KERN_WARNING "isdn_net: Could not register net-device\n");
2586                         kfree(netdev->local);
2587                         kfree(netdev);
2588                         return NULL;
2589                 }
2590         }
2591         netdev->local->magic = ISDN_NET_MAGIC;
2592
2593         netdev->queue = netdev->local;
2594         spin_lock_init(&netdev->queue_lock);
2595
2596         netdev->local->last = netdev->local;
2597         netdev->local->netdev = netdev;
2598         netdev->local->next = netdev->local;
2599
2600         INIT_WORK(&netdev->local->tqueue, (void *)(void *) isdn_net_softint, netdev->local);
2601         spin_lock_init(&netdev->local->xmit_lock);
2602
2603         netdev->local->isdn_device = -1;
2604         netdev->local->isdn_channel = -1;
2605         netdev->local->pre_device = -1;
2606         netdev->local->pre_channel = -1;
2607         netdev->local->exclusive = -1;
2608         netdev->local->ppp_slot = -1;
2609         netdev->local->pppbind = -1;
2610         skb_queue_head_init(&netdev->local->super_tx_queue);
2611         netdev->local->l2_proto = ISDN_PROTO_L2_X75I;
2612         netdev->local->l3_proto = ISDN_PROTO_L3_TRANS;
2613         netdev->local->triggercps = 6000;
2614         netdev->local->slavedelay = 10 * HZ;
2615         netdev->local->hupflags = ISDN_INHUP;   /* Do hangup even on incoming calls */
2616         netdev->local->onhtime = 10;    /* Default hangup-time for saving costs
2617            of those who forget configuring this */
2618         netdev->local->dialmax = 1;
2619         netdev->local->flags = ISDN_NET_CBHUP | ISDN_NET_DM_MANUAL;     /* Hangup before Callback, manual dial */
2620         netdev->local->cbdelay = 25;    /* Wait 5 secs before Callback */
2621         netdev->local->dialtimeout = -1;  /* Infinite Dial-Timeout */
2622         netdev->local->dialwait = 5 * HZ; /* Wait 5 sec. after failed dial */
2623         netdev->local->dialstarted = 0;   /* Jiffies of last dial-start */
2624         netdev->local->dialwait_timer = 0;  /* Jiffies of earliest next dial-start */
2625
2626         /* Put into to netdev-chain */
2627         netdev->next = (void *) dev->netdev;
2628         dev->netdev = netdev;
2629         return netdev->dev.name;
2630 }
2631
2632 char *
2633 isdn_net_newslave(char *parm)
2634 {
2635         char *p = strchr(parm, ',');
2636         isdn_net_dev *n;
2637         char newname[10];
2638
2639         if (p) {
2640                 /* Slave-Name MUST not be empty */
2641                 if (!strlen(p + 1))
2642                         return NULL;
2643                 strcpy(newname, p + 1);
2644                 *p = 0;
2645                 /* Master must already exist */
2646                 if (!(n = isdn_net_findif(parm)))
2647                         return NULL;
2648                 /* Master must be a real interface, not a slave */
2649                 if (n->local->master)
2650                         return NULL;
2651                 /* Master must not be started yet */
2652                 if (isdn_net_device_started(n))
2653                         return NULL;
2654                 return (isdn_net_new(newname, &(n->dev)));
2655         }
2656         return NULL;
2657 }
2658
2659 /*
2660  * Set interface-parameters.
2661  * Always set all parameters, so the user-level application is responsible
2662  * for not overwriting existing setups. It has to get the current
2663  * setup first, if only selected parameters are to be changed.
2664  */
2665 int
2666 isdn_net_setcfg(isdn_net_ioctl_cfg * cfg)
2667 {
2668         isdn_net_dev *p = isdn_net_findif(cfg->name);
2669         ulong features;
2670         int i;
2671         int drvidx;
2672         int chidx;
2673         char drvid[25];
2674
2675         if (p) {
2676                 isdn_net_local *lp = p->local;
2677
2678                 /* See if any registered driver supports the features we want */
2679                 features = ((1 << cfg->l2_proto) << ISDN_FEATURE_L2_SHIFT) |
2680                         ((1 << cfg->l3_proto) << ISDN_FEATURE_L3_SHIFT);
2681                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2682                         if (dev->drv[i])
2683                                 if ((dev->drv[i]->interface->features & features) == features)
2684                                         break;
2685                 if (i == ISDN_MAX_DRIVERS) {
2686                         printk(KERN_WARNING "isdn_net: No driver with selected features\n");
2687                         return -ENODEV;
2688                 }
2689                 if (lp->p_encap != cfg->p_encap){
2690 #ifdef CONFIG_ISDN_X25
2691                         struct concap_proto * cprot = p -> cprot;
2692 #endif
2693                         if (isdn_net_device_started(p)) {
2694                                 printk(KERN_WARNING "%s: cannot change encap when if is up\n",
2695                                        lp->name);
2696                                 return -EBUSY;
2697                         }
2698 #ifdef CONFIG_ISDN_X25
2699                         if( cprot && cprot -> pops )
2700                                 cprot -> pops -> proto_del ( cprot );
2701                         p -> cprot = NULL;
2702                         lp -> dops = NULL;
2703                         /* ... ,  prepare for configuration of new one ... */
2704                         switch ( cfg -> p_encap ){
2705                         case ISDN_NET_ENCAP_X25IFACE:
2706                                 lp -> dops = &isdn_concap_reliable_dl_dops;
2707                         }
2708                         /* ... and allocate new one ... */
2709                         p -> cprot = isdn_concap_new( cfg -> p_encap );
2710                         /* p -> cprot == NULL now if p_encap is not supported
2711                            by means of the concap_proto mechanism */
2712                         /* the protocol is not configured yet; this will
2713                            happen later when isdn_net_reset() is called */
2714 #endif
2715                 }
2716                 switch ( cfg->p_encap ) {
2717                 case ISDN_NET_ENCAP_SYNCPPP:
2718 #ifndef CONFIG_ISDN_PPP
2719                         printk(KERN_WARNING "%s: SyncPPP support not configured\n",
2720                                lp->name);
2721                         return -EINVAL;
2722 #else
2723                         p->dev.type = ARPHRD_PPP;       /* change ARP type */
2724                         p->dev.addr_len = 0;
2725                         p->dev.do_ioctl = isdn_ppp_dev_ioctl;
2726 #endif
2727                         break;
2728                 case ISDN_NET_ENCAP_X25IFACE:
2729 #ifndef CONFIG_ISDN_X25
2730                         printk(KERN_WARNING "%s: isdn-x25 support not configured\n",
2731                                p->local->name);
2732                         return -EINVAL;
2733 #else
2734                         p->dev.type = ARPHRD_X25;       /* change ARP type */
2735                         p->dev.addr_len = 0;
2736 #endif
2737                         break;
2738                 case ISDN_NET_ENCAP_CISCOHDLCK:
2739                         p->dev.do_ioctl = isdn_ciscohdlck_dev_ioctl;
2740                         break;
2741                 default:
2742                         if( cfg->p_encap >= 0 &&
2743                             cfg->p_encap <= ISDN_NET_ENCAP_MAX_ENCAP )
2744                                 break;
2745                         printk(KERN_WARNING
2746                                "%s: encapsulation protocol %d not supported\n",
2747                                p->local->name, cfg->p_encap);
2748                         return -EINVAL;
2749                 }
2750                 if (strlen(cfg->drvid)) {
2751                         /* A bind has been requested ... */
2752                         char *c,
2753                         *e;
2754
2755                         drvidx = -1;
2756                         chidx = -1;
2757                         strcpy(drvid, cfg->drvid);
2758                         if ((c = strchr(drvid, ','))) {
2759                                 /* The channel-number is appended to the driver-Id with a comma */
2760                                 chidx = (int) simple_strtoul(c + 1, &e, 10);
2761                                 if (e == c)
2762                                         chidx = -1;
2763                                 *c = '\0';
2764                         }
2765                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2766                                 /* Lookup driver-Id in array */
2767                                 if (!(strcmp(dev->drvid[i], drvid))) {
2768                                         drvidx = i;
2769                                         break;
2770                                 }
2771                         if ((drvidx == -1) || (chidx == -1))
2772                                 /* Either driver-Id or channel-number invalid */
2773                                 return -ENODEV;
2774                 } else {
2775                         /* Parameters are valid, so get them */
2776                         drvidx = lp->pre_device;
2777                         chidx = lp->pre_channel;
2778                 }
2779                 if (cfg->exclusive > 0) {
2780                         unsigned long flags;
2781
2782                         /* If binding is exclusive, try to grab the channel */
2783                         spin_lock_irqsave(&dev->lock, flags);
2784                         if ((i = isdn_get_free_channel(ISDN_USAGE_NET,
2785                                 lp->l2_proto, lp->l3_proto, drvidx,
2786                                 chidx, lp->msn)) < 0) {
2787                                 /* Grab failed, because desired channel is in use */
2788                                 lp->exclusive = -1;
2789                                 spin_unlock_irqrestore(&dev->lock, flags);
2790                                 return -EBUSY;
2791                         }
2792                         /* All went ok, so update isdninfo */
2793                         dev->usage[i] = ISDN_USAGE_EXCLUSIVE;
2794                         isdn_info_update();
2795                         spin_unlock_irqrestore(&dev->lock, flags);
2796                         lp->exclusive = i;
2797                 } else {
2798                         /* Non-exclusive binding or unbind. */
2799                         lp->exclusive = -1;
2800                         if ((lp->pre_device != -1) && (cfg->exclusive == -1)) {
2801                                 isdn_unexclusive_channel(lp->pre_device, lp->pre_channel);
2802                                 isdn_free_channel(lp->pre_device, lp->pre_channel, ISDN_USAGE_NET);
2803                                 drvidx = -1;
2804                                 chidx = -1;
2805                         }
2806                 }
2807                 strcpy(lp->msn, cfg->eaz);
2808                 lp->pre_device = drvidx;
2809                 lp->pre_channel = chidx;
2810                 lp->onhtime = cfg->onhtime;
2811                 lp->charge = cfg->charge;
2812                 lp->l2_proto = cfg->l2_proto;
2813                 lp->l3_proto = cfg->l3_proto;
2814                 lp->cbdelay = cfg->cbdelay;
2815                 lp->dialmax = cfg->dialmax;
2816                 lp->triggercps = cfg->triggercps;
2817                 lp->slavedelay = cfg->slavedelay * HZ;
2818                 lp->pppbind = cfg->pppbind;
2819                 lp->dialtimeout = cfg->dialtimeout >= 0 ? cfg->dialtimeout * HZ : -1;
2820                 lp->dialwait = cfg->dialwait * HZ;
2821                 if (cfg->secure)
2822                         lp->flags |= ISDN_NET_SECURE;
2823                 else
2824                         lp->flags &= ~ISDN_NET_SECURE;
2825                 if (cfg->cbhup)
2826                         lp->flags |= ISDN_NET_CBHUP;
2827                 else
2828                         lp->flags &= ~ISDN_NET_CBHUP;
2829                 switch (cfg->callback) {
2830                         case 0:
2831                                 lp->flags &= ~(ISDN_NET_CALLBACK | ISDN_NET_CBOUT);
2832                                 break;
2833                         case 1:
2834                                 lp->flags |= ISDN_NET_CALLBACK;
2835                                 lp->flags &= ~ISDN_NET_CBOUT;
2836                                 break;
2837                         case 2:
2838                                 lp->flags |= ISDN_NET_CBOUT;
2839                                 lp->flags &= ~ISDN_NET_CALLBACK;
2840                                 break;
2841                 }
2842                 lp->flags &= ~ISDN_NET_DIALMODE_MASK;   /* first all bits off */
2843                 if (cfg->dialmode && !(cfg->dialmode & ISDN_NET_DIALMODE_MASK)) {
2844                         /* old isdnctrl version, where only 0 or 1 is given */
2845                         printk(KERN_WARNING
2846                              "Old isdnctrl version detected! Please update.\n");
2847                         lp->flags |= ISDN_NET_DM_OFF; /* turn on `off' bit */
2848                 }
2849                 else {
2850                         lp->flags |= cfg->dialmode;  /* turn on selected bits */
2851                 }
2852                 if (cfg->chargehup)
2853                         lp->hupflags |= ISDN_CHARGEHUP;
2854                 else
2855                         lp->hupflags &= ~ISDN_CHARGEHUP;
2856                 if (cfg->ihup)
2857                         lp->hupflags |= ISDN_INHUP;
2858                 else
2859                         lp->hupflags &= ~ISDN_INHUP;
2860                 if (cfg->chargeint > 10) {
2861                         lp->hupflags |= ISDN_CHARGEHUP | ISDN_HAVECHARGE | ISDN_MANCHARGE;
2862                         lp->chargeint = cfg->chargeint * HZ;
2863                 }
2864                 if (cfg->p_encap != lp->p_encap) {
2865                         if (cfg->p_encap == ISDN_NET_ENCAP_RAWIP) {
2866                                 p->dev.hard_header = NULL;
2867                                 p->dev.hard_header_cache = NULL;
2868                                 p->dev.header_cache_update = NULL;
2869                                 p->dev.flags = IFF_NOARP|IFF_POINTOPOINT;
2870                         } else {
2871                                 p->dev.hard_header = isdn_net_header;
2872                                 if (cfg->p_encap == ISDN_NET_ENCAP_ETHER) {
2873                                         p->dev.hard_header_cache = lp->org_hhc;
2874                                         p->dev.header_cache_update = lp->org_hcu;
2875                                         p->dev.flags = IFF_BROADCAST | IFF_MULTICAST;
2876                                 } else {
2877                                         p->dev.hard_header_cache = NULL;
2878                                         p->dev.header_cache_update = NULL;
2879                                         p->dev.flags = IFF_NOARP|IFF_POINTOPOINT;
2880                                 }
2881                         }
2882                 }
2883                 lp->p_encap = cfg->p_encap;
2884                 return 0;
2885         }
2886         return -ENODEV;
2887 }
2888
2889 /*
2890  * Perform get-interface-parameters.ioctl
2891  */
2892 int
2893 isdn_net_getcfg(isdn_net_ioctl_cfg * cfg)
2894 {
2895         isdn_net_dev *p = isdn_net_findif(cfg->name);
2896
2897         if (p) {
2898                 isdn_net_local *lp = p->local;
2899
2900                 strcpy(cfg->eaz, lp->msn);
2901                 cfg->exclusive = lp->exclusive;
2902                 if (lp->pre_device >= 0) {
2903                         sprintf(cfg->drvid, "%s,%d", dev->drvid[lp->pre_device],
2904                                 lp->pre_channel);
2905                 } else
2906                         cfg->drvid[0] = '\0';
2907                 cfg->onhtime = lp->onhtime;
2908                 cfg->charge = lp->charge;
2909                 cfg->l2_proto = lp->l2_proto;
2910                 cfg->l3_proto = lp->l3_proto;
2911                 cfg->p_encap = lp->p_encap;
2912                 cfg->secure = (lp->flags & ISDN_NET_SECURE) ? 1 : 0;
2913                 cfg->callback = 0;
2914                 if (lp->flags & ISDN_NET_CALLBACK)
2915                         cfg->callback = 1;
2916                 if (lp->flags & ISDN_NET_CBOUT)
2917                         cfg->callback = 2;
2918                 cfg->cbhup = (lp->flags & ISDN_NET_CBHUP) ? 1 : 0;
2919                 cfg->dialmode = lp->flags & ISDN_NET_DIALMODE_MASK;
2920                 cfg->chargehup = (lp->hupflags & 4) ? 1 : 0;
2921                 cfg->ihup = (lp->hupflags & 8) ? 1 : 0;
2922                 cfg->cbdelay = lp->cbdelay;
2923                 cfg->dialmax = lp->dialmax;
2924                 cfg->triggercps = lp->triggercps;
2925                 cfg->slavedelay = lp->slavedelay / HZ;
2926                 cfg->chargeint = (lp->hupflags & ISDN_CHARGEHUP) ?
2927                     (lp->chargeint / HZ) : 0;
2928                 cfg->pppbind = lp->pppbind;
2929                 cfg->dialtimeout = lp->dialtimeout >= 0 ? lp->dialtimeout / HZ : -1;
2930                 cfg->dialwait = lp->dialwait / HZ;
2931                 if (lp->slave)
2932                         strcpy(cfg->slave, ((isdn_net_local *) lp->slave->priv)->name);
2933                 else
2934                         cfg->slave[0] = '\0';
2935                 if (lp->master)
2936                         strcpy(cfg->master, ((isdn_net_local *) lp->master->priv)->name);
2937                 else
2938                         cfg->master[0] = '\0';
2939                 return 0;
2940         }
2941         return -ENODEV;
2942 }
2943
2944 /*
2945  * Add a phone-number to an interface.
2946  */
2947 int
2948 isdn_net_addphone(isdn_net_ioctl_phone * phone)
2949 {
2950         isdn_net_dev *p = isdn_net_findif(phone->name);
2951         isdn_net_phone *n;
2952
2953         if (p) {
2954                 if (!(n = (isdn_net_phone *) kmalloc(sizeof(isdn_net_phone), GFP_KERNEL)))
2955                         return -ENOMEM;
2956                 strcpy(n->num, phone->phone);
2957                 n->next = p->local->phone[phone->outgoing & 1];
2958                 p->local->phone[phone->outgoing & 1] = n;
2959                 return 0;
2960         }
2961         return -ENODEV;
2962 }
2963
2964 /*
2965  * Copy a string of all phone-numbers of an interface to user space.
2966  * This might sleep and must be called with the isdn semaphore down.
2967  */
2968 int
2969 isdn_net_getphones(isdn_net_ioctl_phone * phone, char __user *phones)
2970 {
2971         isdn_net_dev *p = isdn_net_findif(phone->name);
2972         int inout = phone->outgoing & 1;
2973         int more = 0;
2974         int count = 0;
2975         isdn_net_phone *n;
2976
2977         if (!p)
2978                 return -ENODEV;
2979         inout &= 1;
2980         for (n = p->local->phone[inout]; n; n = n->next) {
2981                 if (more) {
2982                         put_user(' ', phones++);
2983                         count++;
2984                 }
2985                 if (copy_to_user(phones, n->num, strlen(n->num) + 1)) {
2986                         return -EFAULT;
2987                 }
2988                 phones += strlen(n->num);
2989                 count += strlen(n->num);
2990                 more = 1;
2991         }
2992         put_user(0, phones);
2993         count++;
2994         return count;
2995 }
2996
2997 /*
2998  * Copy a string containing the peer's phone number of a connected interface
2999  * to user space.
3000  */
3001 int
3002 isdn_net_getpeer(isdn_net_ioctl_phone *phone, isdn_net_ioctl_phone __user *peer)
3003 {
3004         isdn_net_dev *p = isdn_net_findif(phone->name);
3005         int ch, dv, idx;
3006
3007         if (!p) return -ENODEV;
3008         /*
3009          * Theoretical race: while this executes, the remote number might
3010          * become invalid (hang up) or change (new connection), resulting
3011          * in (partially) wrong number copied to user. This race
3012          * currently ignored.
3013          */
3014         ch = p->local->isdn_channel;
3015         dv = p->local->isdn_device;
3016         if(ch<0 && dv<0) return -ENOTCONN;
3017         idx = isdn_dc2minor(dv, ch);
3018         if (idx<0) return -ENODEV;
3019         /* for pre-bound channels, we need this extra check */
3020         if ( strncmp(dev->num[idx],"???",3) == 0 ) return -ENOTCONN;
3021         strncpy(phone->phone,dev->num[idx],ISDN_MSNLEN);
3022         phone->outgoing=USG_OUTGOING(dev->usage[idx]);
3023         if ( copy_to_user(peer,phone,sizeof(*peer)) ) return -EFAULT;
3024         return 0;
3025 }
3026 /*
3027  * Delete a phone-number from an interface.
3028  */
3029 int
3030 isdn_net_delphone(isdn_net_ioctl_phone * phone)
3031 {
3032         isdn_net_dev *p = isdn_net_findif(phone->name);
3033         int inout = phone->outgoing & 1;
3034         isdn_net_phone *n;
3035         isdn_net_phone *m;
3036
3037         if (p) {
3038                 n = p->local->phone[inout];
3039                 m = NULL;
3040                 while (n) {
3041                         if (!strcmp(n->num, phone->phone)) {
3042                                 if (p->local->dial == n)
3043                                         p->local->dial = n->next;
3044                                 if (m)
3045                                         m->next = n->next;
3046                                 else
3047                                         p->local->phone[inout] = n->next;
3048                                 kfree(n);
3049                                 return 0;
3050                         }
3051                         m = n;
3052                         n = (isdn_net_phone *) n->next;
3053                 }
3054                 return -EINVAL;
3055         }
3056         return -ENODEV;
3057 }
3058
3059 /*
3060  * Delete all phone-numbers of an interface.
3061  */
3062 static int
3063 isdn_net_rmallphone(isdn_net_dev * p)
3064 {
3065         isdn_net_phone *n;
3066         isdn_net_phone *m;
3067         int i;
3068
3069         for (i = 0; i < 2; i++) {
3070                 n = p->local->phone[i];
3071                 while (n) {
3072                         m = n->next;
3073                         kfree(n);
3074                         n = m;
3075                 }
3076                 p->local->phone[i] = NULL;
3077         }
3078         p->local->dial = NULL;
3079         return 0;
3080 }
3081
3082 /*
3083  * Force a hangup of a network-interface.
3084  */
3085 int
3086 isdn_net_force_hangup(char *name)
3087 {
3088         isdn_net_dev *p = isdn_net_findif(name);
3089         struct net_device *q;
3090
3091         if (p) {
3092                 if (p->local->isdn_device < 0)
3093                         return 1;
3094                 q = p->local->slave;
3095                 /* If this interface has slaves, do a hangup for them also. */
3096                 while (q) {
3097                         isdn_net_hangup(q);
3098                         q = (((isdn_net_local *) q->priv)->slave);
3099                 }
3100                 isdn_net_hangup(&p->dev);
3101                 return 0;
3102         }
3103         return -ENODEV;
3104 }
3105
3106 /*
3107  * Helper-function for isdn_net_rm: Do the real work.
3108  */
3109 static int
3110 isdn_net_realrm(isdn_net_dev * p, isdn_net_dev * q)
3111 {
3112         u_long flags;
3113
3114         if (isdn_net_device_started(p)) {
3115                 return -EBUSY;
3116         }
3117 #ifdef CONFIG_ISDN_X25
3118         if( p -> cprot && p -> cprot -> pops )
3119                 p -> cprot -> pops -> proto_del ( p -> cprot );
3120 #endif
3121         /* Free all phone-entries */
3122         isdn_net_rmallphone(p);
3123         /* If interface is bound exclusive, free channel-usage */
3124         if (p->local->exclusive != -1)
3125                 isdn_unexclusive_channel(p->local->pre_device, p->local->pre_channel);
3126         if (p->local->master) {
3127                 /* It's a slave-device, so update master's slave-pointer if necessary */
3128                 if (((isdn_net_local *) (p->local->master->priv))->slave == &p->dev)
3129                         ((isdn_net_local *) (p->local->master->priv))->slave = p->local->slave;
3130         } else {
3131                 /* Unregister only if it's a master-device */
3132                 p->dev.hard_header_cache = p->local->org_hhc;
3133                 p->dev.header_cache_update = p->local->org_hcu;
3134                 unregister_netdev(&p->dev);
3135         }
3136         /* Unlink device from chain */
3137         spin_lock_irqsave(&dev->lock, flags);
3138         if (q)
3139                 q->next = p->next;
3140         else
3141                 dev->netdev = p->next;
3142         if (p->local->slave) {
3143                 /* If this interface has a slave, remove it also */
3144                 char *slavename = ((isdn_net_local *) (p->local->slave->priv))->name;
3145                 isdn_net_dev *n = dev->netdev;
3146                 q = NULL;
3147                 while (n) {
3148                         if (!strcmp(n->local->name, slavename)) {
3149                                 spin_unlock_irqrestore(&dev->lock, flags);
3150                                 isdn_net_realrm(n, q);
3151                                 spin_lock_irqsave(&dev->lock, flags);
3152                                 break;
3153                         }
3154                         q = n;
3155                         n = (isdn_net_dev *) n->next;
3156                 }
3157         }
3158         spin_unlock_irqrestore(&dev->lock, flags);
3159         /* If no more net-devices remain, disable auto-hangup timer */
3160         if (dev->netdev == NULL)
3161                 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 0);
3162         kfree(p->local);
3163         kfree(p);
3164
3165         return 0;
3166 }
3167
3168 /*
3169  * Remove a single network-interface.
3170  */
3171 int
3172 isdn_net_rm(char *name)
3173 {
3174         u_long flags;
3175         isdn_net_dev *p;
3176         isdn_net_dev *q;
3177
3178         /* Search name in netdev-chain */
3179         spin_lock_irqsave(&dev->lock, flags);
3180         p = dev->netdev;
3181         q = NULL;
3182         while (p) {
3183                 if (!strcmp(p->local->name, name)) {
3184                         spin_unlock_irqrestore(&dev->lock, flags);
3185                         return (isdn_net_realrm(p, q));
3186                 }
3187                 q = p;
3188                 p = (isdn_net_dev *) p->next;
3189         }
3190         spin_unlock_irqrestore(&dev->lock, flags);
3191         /* If no more net-devices remain, disable auto-hangup timer */
3192         if (dev->netdev == NULL)
3193                 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 0);
3194         return -ENODEV;
3195 }
3196
3197 /*
3198  * Remove all network-interfaces
3199  */
3200 int
3201 isdn_net_rmall(void)
3202 {
3203         u_long flags;
3204         int ret;
3205
3206         /* Walk through netdev-chain */
3207         spin_lock_irqsave(&dev->lock, flags);
3208         while (dev->netdev) {
3209                 if (!dev->netdev->local->master) {
3210                         /* Remove master-devices only, slaves get removed with their master */
3211                         spin_unlock_irqrestore(&dev->lock, flags);
3212                         if ((ret = isdn_net_realrm(dev->netdev, NULL))) {
3213                                 return ret;
3214                         }
3215                         spin_lock_irqsave(&dev->lock, flags);
3216                 }
3217         }
3218         dev->netdev = NULL;
3219         spin_unlock_irqrestore(&dev->lock, flags);
3220         return 0;
3221 }