net/wanrouter/wanmain.c

   1 /*****************************************************************************
   2 * wanmain.c     WAN Multiprotocol Router Module. Main code.
   3 *
   4 *               This module is completely hardware-independent and provides
   5 *               the following common services for the WAN Link Drivers:
   6 *                o WAN device managenment (registering, unregistering)
   7 *                o Network interface management
   8 *                o Physical connection management (dial-up, incoming calls)
   9 *                o Logical connection management (switched virtual circuits)
  10 *                o Protocol encapsulation/decapsulation
  11 *
  12 * Author:       Gideon Hack
  13 *
  14 * Copyright:    (c) 1995-1999 Sangoma Technologies Inc.
  15 *
  16 *               This program is free software; you can redistribute it and/or
  17 *               modify it under the terms of the GNU General Public License
  18 *               as published by the Free Software Foundation; either version
  19 *               2 of the License, or (at your option) any later version.
  20 * ============================================================================
  21 * Nov 24, 2000  Nenad Corbic    Updated for 2.4.X kernels
  22 * Nov 07, 2000  Nenad Corbic    Fixed the Mulit-Port PPP for kernels 2.2.16 and
  23 *                               greater.
  24 * Aug 2,  2000  Nenad Corbic    Block the Multi-Port PPP from running on
  25 *                               kernels 2.2.16 or greater.  The SyncPPP
  26 *                               has changed.
  27 * Jul 13, 2000  Nenad Corbic    Added SyncPPP support
  28 *                               Added extra debugging in device_setup().
  29 * Oct 01, 1999  Gideon Hack     Update for s514 PCI card
  30 * Dec 27, 1996  Gene Kozin      Initial version (based on Sangoma's WANPIPE)
  31 * Jan 16, 1997  Gene Kozin      router_devlist made public
  32 * Jan 31, 1997  Alan Cox        Hacked it about a bit for 2.1
  33 * Jun 27, 1997  Alan Cox        realigned with vendor code
  34 * Oct 15, 1997  Farhan Thawar   changed wan_encapsulate to add a pad byte of 0
  35 * Apr 20, 1998  Alan Cox        Fixed 2.1 symbols
  36 * May 17, 1998  K. Baranowski   Fixed SNAP encapsulation in wan_encapsulate
  37 * Dec 15, 1998  Arnaldo Melo    support for firmwares of up to 128000 bytes
  38 *                               check wandev->setup return value
  39 * Dec 22, 1998  Arnaldo Melo    vmalloc/vfree used in device_setup to allocate
  40 *                               kernel memory and copy configuration data to
  41 *                               kernel space (for big firmwares)
  42 * Jun 02, 1999  Gideon Hack     Updates for Linux 2.0.X and 2.2.X kernels.
  43 *****************************************************************************/
  44
  45 #include <linux/config.h>
  46 #include <linux/stddef.h>       /* offsetof(), etc. */
  47 #include <linux/capability.h>
  48 #include <linux/errno.h>        /* return codes */
  49 #include <linux/kernel.h>
  50 #include <linux/init.h>
  51 #include <linux/module.h>       /* support for loadable modules */
  52 #include <linux/slab.h>         /* kmalloc(), kfree() */
  53 #include <linux/mm.h>
  54 #include <linux/string.h>       /* inline mem*, str* functions */
  55
  56 #include <asm/byteorder.h>      /* htons(), etc. */
  57 #include <linux/wanrouter.h>    /* WAN router API definitions */
  58
  59 #include <linux/vmalloc.h>      /* vmalloc, vfree */
  60 #include <asm/uaccess.h>        /* copy_to/from_user */
  61 #include <linux/init.h>         /* __initfunc et al. */
  62 #include <net/syncppp.h>
  63
  64 #define KMEM_SAFETYZONE 8
  65
  66 /***********FOR DEBUGGING PURPOSES*********************************************
  67 static void * dbg_kmalloc(unsigned int size, int prio, int line) {
  68         int i = 0;
  69         void * v = kmalloc(size+sizeof(unsigned int)+2*KMEM_SAFETYZONE*8,prio);
  70         char * c1 = v;
  71         c1 += sizeof(unsigned int);
  72         *((unsigned int *)v) = size;
  73
  74         for (i = 0; i < KMEM_SAFETYZONE; i++) {
  75                 c1[0] = 'D'; c1[1] = 'E'; c1[2] = 'A'; c1[3] = 'D';
  76                 c1[4] = 'B'; c1[5] = 'E'; c1[6] = 'E'; c1[7] = 'F';
  77                 c1 += 8;
  78         }
  79         c1 += size;
  80         for (i = 0; i < KMEM_SAFETYZONE; i++) {
  81                 c1[0] = 'M'; c1[1] = 'U'; c1[2] = 'N'; c1[3] = 'G';
  82                 c1[4] = 'W'; c1[5] = 'A'; c1[6] = 'L'; c1[7] = 'L';
  83                 c1 += 8;
  84         }
  85         v = ((char *)v) + sizeof(unsigned int) + KMEM_SAFETYZONE*8;
  86         printk(KERN_INFO "line %d  kmalloc(%d,%d) = %p\n",line,size,prio,v);
  87         return v;
  88 }
  89 static void dbg_kfree(void * v, int line) {
  90         unsigned int * sp = (unsigned int *)(((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8));
  91         unsigned int size = *sp;
  92         char * c1 = ((char *)v) - KMEM_SAFETYZONE*8;
  93         int i = 0;
  94         for (i = 0; i < KMEM_SAFETYZONE; i++) {
  95                 if (   c1[0] != 'D' || c1[1] != 'E' || c1[2] != 'A' || c1[3] != 'D'
  96                     || c1[4] != 'B' || c1[5] != 'E' || c1[6] != 'E' || c1[7] != 'F') {
  97                         printk(KERN_INFO "kmalloced block at %p has been corrupted (underrun)!\n",v);
  98                         printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
  99                                         c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
 100                 }
 101                 c1 += 8;
 102         }
 103         c1 += size;
 104         for (i = 0; i < KMEM_SAFETYZONE; i++) {
 105                 if (   c1[0] != 'M' || c1[1] != 'U' || c1[2] != 'N' || c1[3] != 'G'
 106                     || c1[4] != 'W' || c1[5] != 'A' || c1[6] != 'L' || c1[7] != 'L'
 107                    ) {
 108                         printk(KERN_INFO "kmalloced block at %p has been corrupted (overrun):\n",v);
 109                         printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
 110                                         c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
 111                 }
 112                 c1 += 8;
 113         }
 114         printk(KERN_INFO "line %d  kfree(%p)\n",line,v);
 115         v = ((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8);
 116         kfree(v);
 117 }
 118
 119 #define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
 120 #define kfree(x) dbg_kfree(x,__LINE__)
 121 *****************************************************************************/
 122
 123 /*
 124  *      Function Prototypes
 125  */
 126
 127 /*
 128  *      WAN device IOCTL handlers
 129  */
 130
 131 static int wanrouter_device_setup(struct wan_device *wandev,
 132                                   wandev_conf_t __user *u_conf);
 133 static int wanrouter_device_stat(struct wan_device *wandev,
 134                                  wandev_stat_t __user *u_stat);
 135 static int wanrouter_device_shutdown(struct wan_device *wandev);
 136 static int wanrouter_device_new_if(struct wan_device *wandev,
 137                                    wanif_conf_t __user *u_conf);
 138 static int wanrouter_device_del_if(struct wan_device *wandev,
 139                                    char __user *u_name);
 140
 141 /*
 142  *      Miscellaneous
 143  */
 144
 145 static struct wan_device *wanrouter_find_device(char *name);
 146 static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
 147 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
 148 void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
 149
 150
 151
 152 /*
 153  *      Global Data
 154  */
 155
 156 static char wanrouter_fullname[]  = "Sangoma WANPIPE Router";
 157 static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
 158 static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
 159 struct wan_device* wanrouter_router_devlist; /* list of registered devices */
 160
 161 /*
 162  *      Organize Unique Identifiers for encapsulation/decapsulation
 163  */
 164
 165 static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
 166 #if 0
 167 static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
 168 #endif
 169
 170 static int __init wanrouter_init(void)
 171 {
 172         int err;
 173
 174         printk(KERN_INFO "%s v%u.%u %s\n",
 175                wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
 176                wanrouter_copyright);
 177
 178         err = wanrouter_proc_init();
 179         if (err)
 180                 printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
 181                        wanrouter_modname);
 182
 183         return err;
 184 }
 185
 186 static void __exit wanrouter_cleanup (void)
 187 {
 188         wanrouter_proc_cleanup();
 189 }
 190
 191 /*
 192  * This is just plain dumb.  We should move the bugger to drivers/net/wan,
 193  * slap it first in directory and make it module_init().  The only reason
 194  * for subsys_initcall() here is that net goes after drivers (why, BTW?)
 195  */
 196 subsys_initcall(wanrouter_init);
 197 module_exit(wanrouter_cleanup);
 198
 199 /*
 200  *      Kernel APIs
 201  */
 202
 203 /*
 204  *      Register WAN device.
 205  *      o verify device credentials
 206  *      o create an entry for the device in the /proc/net/router directory
 207  *      o initialize internally maintained fields of the wan_device structure
 208  *      o link device data space to a singly-linked list
 209  *      o if it's the first device, then start kernel 'thread'
 210  *      o increment module use count
 211  *
 212  *      Return:
 213  *      0       Ok
 214  *      < 0     error.
 215  *
 216  *      Context:        process
 217  */
 218
 219
 220 int register_wan_device(struct wan_device *wandev)
 221 {
 222         int err, namelen;
 223
 224         if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
 225             (wandev->name == NULL))
 226                 return -EINVAL;
 227
 228         namelen = strlen(wandev->name);
 229         if (!namelen || (namelen > WAN_DRVNAME_SZ))
 230                 return -EINVAL;
 231
 232         if (wanrouter_find_device(wandev->name))
 233                 return -EEXIST;
 234
 235 #ifdef WANDEBUG
 236         printk(KERN_INFO "%s: registering WAN device %s\n",
 237                wanrouter_modname, wandev->name);
 238 #endif
 239
 240         /*
 241          *      Register /proc directory entry
 242          */
 243         err = wanrouter_proc_add(wandev);
 244         if (err) {
 245                 printk(KERN_INFO
 246                         "%s: can't create /proc/net/router/%s entry!\n",
 247                         wanrouter_modname, wandev->name);
 248                 return err;
 249         }
 250
 251         /*
 252          *      Initialize fields of the wan_device structure maintained by the
 253          *      router and update local data.
 254          */
 255
 256         wandev->ndev = 0;
 257         wandev->dev  = NULL;
 258         wandev->next = wanrouter_router_devlist;
 259         wanrouter_router_devlist = wandev;
 260         return 0;
 261 }
 262
 263 /*
 264  *      Unregister WAN device.
 265  *      o shut down device
 266  *      o unlink device data space from the linked list
 267  *      o delete device entry in the /proc/net/router directory
 268  *      o decrement module use count
 269  *
 270  *      Return:         0       Ok
 271  *                      <0      error.
 272  *      Context:        process
 273  */
 274
 275
 276 int unregister_wan_device(char *name)
 277 {
 278         struct wan_device *wandev, *prev;
 279
 280         if (name == NULL)
 281                 return -EINVAL;
 282
 283         for (wandev = wanrouter_router_devlist, prev = NULL;
 284                 wandev && strcmp(wandev->name, name);
 285                 prev = wandev, wandev = wandev->next)
 286                 ;
 287         if (wandev == NULL)
 288                 return -ENODEV;
 289
 290 #ifdef WANDEBUG
 291         printk(KERN_INFO "%s: unregistering WAN device %s\n",
 292                wanrouter_modname, name);
 293 #endif
 294
 295         if (wandev->state != WAN_UNCONFIGURED)
 296                 wanrouter_device_shutdown(wandev);
 297
 298         if (prev)
 299                 prev->next = wandev->next;
 300         else
 301                 wanrouter_router_devlist = wandev->next;
 302
 303         wanrouter_proc_delete(wandev);
 304         return 0;
 305 }
 306
 307 /*
 308  *      Encapsulate packet.
 309  *
 310  *      Return: encapsulation header size
 311  *              < 0     - unsupported Ethertype
 312  *
 313  *      Notes:
 314  *      1. This function may be called on interrupt context.
 315  */
 316
 317
 318 int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
 319                           unsigned short type)
 320 {
 321         int hdr_len = 0;
 322
 323         switch (type) {
 324         case ETH_P_IP:          /* IP datagram encapsulation */
 325                 hdr_len += 1;
 326                 skb_push(skb, 1);
 327                 skb->data[0] = NLPID_IP;
 328                 break;
 329
 330         case ETH_P_IPX:         /* SNAP encapsulation */
 331         case ETH_P_ARP:
 332                 hdr_len += 7;
 333                 skb_push(skb, 7);
 334                 skb->data[0] = 0;
 335                 skb->data[1] = NLPID_SNAP;
 336                 memcpy(&skb->data[2], wanrouter_oui_ether,
 337                        sizeof(wanrouter_oui_ether));
 338                 *((unsigned short*)&skb->data[5]) = htons(type);
 339                 break;
 340
 341         default:                /* Unknown packet type */
 342                 printk(KERN_INFO
 343                         "%s: unsupported Ethertype 0x%04X on interface %s!\n",
 344                         wanrouter_modname, type, dev->name);
 345                 hdr_len = -EINVAL;
 346         }
 347         return hdr_len;
 348 }
 349
 350
 351 /*
 352  *      Decapsulate packet.
 353  *
 354  *      Return: Ethertype (in network order)
 355  *                      0       unknown encapsulation
 356  *
 357  *      Notes:
 358  *      1. This function may be called on interrupt context.
 359  */
 360
 361
 362 __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
 363 {
 364         int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
 365         __be16 ethertype;
 366
 367         switch (skb->data[cnt]) {
 368         case NLPID_IP:          /* IP datagramm */
 369                 ethertype = htons(ETH_P_IP);
 370                 cnt += 1;
 371                 break;
 372
 373         case NLPID_SNAP:        /* SNAP encapsulation */
 374                 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
 375                            sizeof(wanrouter_oui_ether))){
 376                         printk(KERN_INFO
 377                                 "%s: unsupported SNAP OUI %02X-%02X-%02X "
 378                                 "on interface %s!\n", wanrouter_modname,
 379                                 skb->data[cnt+1], skb->data[cnt+2],
 380                                 skb->data[cnt+3], dev->name);
 381                         return 0;
 382                 }
 383                 ethertype = *((__be16*)&skb->data[cnt+4]);
 384                 cnt += 6;
 385                 break;
 386
 387         /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
 388
 389         default:
 390                 printk(KERN_INFO
 391                         "%s: unsupported NLPID 0x%02X on interface %s!\n",
 392                         wanrouter_modname, skb->data[cnt], dev->name);
 393                 return 0;
 394         }
 395         skb->protocol = ethertype;
 396         skb->pkt_type = PACKET_HOST;    /*      Physically point to point */
 397         skb_pull(skb, cnt);
 398         skb->mac.raw  = skb->data;
 399         return ethertype;
 400 }
 401
 402
 403 /*
 404  *      WAN device IOCTL.
 405  *      o find WAN device associated with this node
 406  *      o execute requested action or pass command to the device driver
 407  */
 408
 409 int wanrouter_ioctl(struct inode *inode, struct file *file,
 410                 unsigned int cmd, unsigned long arg)
 411 {
 412         int err = 0;
 413         struct proc_dir_entry *dent;
 414         struct wan_device *wandev;
 415         void __user *data = (void __user *)arg;
 416
 417         if (!capable(CAP_NET_ADMIN))
 418                 return -EPERM;
 419
 420         if ((cmd >> 8) != ROUTER_IOCTL)
 421                 return -EINVAL;
 422
 423         dent = PDE(inode);
 424         if ((dent == NULL) || (dent->data == NULL))
 425                 return -EINVAL;
 426
 427         wandev = dent->data;
 428         if (wandev->magic != ROUTER_MAGIC)
 429                 return -EINVAL;
 430
 431         switch (cmd) {
 432         case ROUTER_SETUP:
 433                 err = wanrouter_device_setup(wandev, data);
 434                 break;
 435
 436         case ROUTER_DOWN:
 437                 err = wanrouter_device_shutdown(wandev);
 438                 break;
 439
 440         case ROUTER_STAT:
 441                 err = wanrouter_device_stat(wandev, data);
 442                 break;
 443
 444         case ROUTER_IFNEW:
 445                 err = wanrouter_device_new_if(wandev, data);
 446                 break;
 447
 448         case ROUTER_IFDEL:
 449                 err = wanrouter_device_del_if(wandev, data);
 450                 break;
 451
 452         case ROUTER_IFSTAT:
 453                 break;
 454
 455         default:
 456                 if ((cmd >= ROUTER_USER) &&
 457                     (cmd <= ROUTER_USER_MAX) &&
 458                     wandev->ioctl)
 459                         err = wandev->ioctl(wandev, cmd, arg);
 460                 else err = -EINVAL;
 461         }
 462         return err;
 463 }
 464
 465 /*
 466  *      WAN Driver IOCTL Handlers
 467  */
 468
 469 /*
 470  *      Setup WAN link device.
 471  *      o verify user address space
 472  *      o allocate kernel memory and copy configuration data to kernel space
 473  *      o if configuration data includes extension, copy it to kernel space too
 474  *      o call driver's setup() entry point
 475  */
 476
 477 static int wanrouter_device_setup(struct wan_device *wandev,
 478                                   wandev_conf_t __user *u_conf)
 479 {
 480         void *data = NULL;
 481         wandev_conf_t *conf;
 482         int err = -EINVAL;
 483
 484         if (wandev->setup == NULL) {    /* Nothing to do ? */
 485                 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
 486                                 wandev->name);
 487                 return 0;
 488         }
 489
 490         conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
 491         if (conf == NULL){
 492                 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
 493                                 wandev->name);
 494                 return -ENOBUFS;
 495         }
 496
 497         if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
 498                 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
 499                                 wandev->name);
 500                 kfree(conf);
 501                 return -EFAULT;
 502         }
 503
 504         if (conf->magic != ROUTER_MAGIC) {
 505                 kfree(conf);
 506                 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
 507                                 wandev->name);
 508                 return -EINVAL;
 509         }
 510
 511         if (conf->data_size && conf->data) {
 512                 if (conf->data_size > 128000 || conf->data_size < 0) {
 513                         printk(KERN_INFO
 514                             "%s: ERROR, Invalid firmware data size %i !\n",
 515                                         wandev->name, conf->data_size);
 516                         kfree(conf);
 517                         return -EINVAL;
 518                 }
 519
 520                 data = vmalloc(conf->data_size);
 521                 if (!data) {
 522                         printk(KERN_INFO
 523                                 "%s: ERROR, Faild allocate kernel memory !\n",
 524                                 wandev->name);
 525                         kfree(conf);
 526                         return -ENOBUFS;
 527                 }
 528                 if (!copy_from_user(data, conf->data, conf->data_size)) {
 529                         conf->data = data;
 530                         err = wandev->setup(wandev, conf);
 531                 } else {
 532                         printk(KERN_INFO
 533                              "%s: ERROR, Faild to copy from user data !\n",
 534                                wandev->name);
 535                         err = -EFAULT;
 536                 }
 537                 vfree(data);
 538         } else {
 539                 printk(KERN_INFO
 540                     "%s: ERROR, No firmware found ! Firmware size = %i !\n",
 541                                 wandev->name, conf->data_size);
 542         }
 543
 544         kfree(conf);
 545         return err;
 546 }
 547
 548 /*
 549  *      Shutdown WAN device.
 550  *      o delete all not opened logical channels for this device
 551  *      o call driver's shutdown() entry point
 552  */
 553
 554 static int wanrouter_device_shutdown(struct wan_device *wandev)
 555 {
 556         struct net_device *dev;
 557         int err=0;
 558
 559         if (wandev->state == WAN_UNCONFIGURED)
 560                 return 0;
 561
 562         printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
 563
 564         for (dev = wandev->dev; dev;) {
 565                 err = wanrouter_delete_interface(wandev, dev->name);
 566                 if (err)
 567                         return err;
 568                 /* The above function deallocates the current dev
 569                  * structure. Therefore, we cannot use dev->priv
 570                  * as the next element: wandev->dev points to the
 571                  * next element */
 572                 dev = wandev->dev;
 573         }
 574
 575         if (wandev->ndev)
 576                 return -EBUSY;  /* there are opened interfaces  */
 577
 578         if (wandev->shutdown)
 579                 err=wandev->shutdown(wandev);
 580
 581         return err;
 582 }
 583
 584 /*
 585  *      Get WAN device status & statistics.
 586  */
 587
 588 static int wanrouter_device_stat(struct wan_device *wandev,
 589                                  wandev_stat_t __user *u_stat)
 590 {
 591         wandev_stat_t stat;
 592
 593         memset(&stat, 0, sizeof(stat));
 594
 595         /* Ask device driver to update device statistics */
 596         if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
 597                 wandev->update(wandev);
 598
 599         /* Fill out structure */
 600         stat.ndev  = wandev->ndev;
 601         stat.state = wandev->state;
 602
 603         if (copy_to_user(u_stat, &stat, sizeof(stat)))
 604                 return -EFAULT;
 605
 606         return 0;
 607 }
 608
 609 /*
 610  *      Create new WAN interface.
 611  *      o verify user address space
 612  *      o copy configuration data to kernel address space
 613  *      o allocate network interface data space
 614  *      o call driver's new_if() entry point
 615  *      o make sure there is no interface name conflict
 616  *      o register network interface
 617  */
 618
 619 static int wanrouter_device_new_if(struct wan_device *wandev,
 620                                    wanif_conf_t __user *u_conf)
 621 {
 622         wanif_conf_t *cnf;
 623         struct net_device *dev = NULL;
 624 #ifdef CONFIG_WANPIPE_MULTPPP
 625         struct ppp_device *pppdev=NULL;
 626 #endif
 627         int err;
 628
 629         if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
 630                 return -ENODEV;
 631
 632         cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
 633         if (!cnf)
 634                 return -ENOBUFS;
 635
 636         err = -EFAULT;
 637         if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
 638                 goto out;
 639
 640         err = -EINVAL;
 641         if (cnf->magic != ROUTER_MAGIC)
 642                 goto out;
 643
 644         if (cnf->config_id == WANCONFIG_MPPP) {
 645 #ifdef CONFIG_WANPIPE_MULTPPP
 646                 pppdev = kmalloc(sizeof(struct ppp_device), GFP_KERNEL);
 647                 err = -ENOBUFS;
 648                 if (pppdev == NULL)
 649                         goto out;
 650                 memset(pppdev, 0, sizeof(struct ppp_device));
 651                 pppdev->dev = kmalloc(sizeof(struct net_device), GFP_KERNEL);
 652                 if (pppdev->dev == NULL) {
 653                         kfree(pppdev);
 654                         err = -ENOBUFS;
 655                         goto out;
 656                 }
 657                 memset(pppdev->dev, 0, sizeof(struct net_device));
 658                 err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
 659                 dev = pppdev->dev;
 660 #else
 661                 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
 662                                 wandev->name);
 663                 err = -EPROTONOSUPPORT;
 664                 goto out;
 665 #endif
 666         } else {
 667                 dev = kmalloc(sizeof(struct net_device), GFP_KERNEL);
 668                 err = -ENOBUFS;
 669                 if (dev == NULL)
 670                         goto out;
 671                 memset(dev, 0, sizeof(struct net_device));
 672                 err = wandev->new_if(wandev, dev, cnf);
 673         }
 674
 675         if (!err) {
 676                 /* Register network interface. This will invoke init()
 677                  * function supplied by the driver.  If device registered
 678                  * successfully, add it to the interface list.
 679                  */
 680
 681                 if (dev->name == NULL) {
 682                         err = -EINVAL;
 683                 } else {
 684
 685                         #ifdef WANDEBUG
 686                         printk(KERN_INFO "%s: registering interface %s...\n",
 687                                 wanrouter_modname, dev->name);
 688                         #endif
 689
 690                         err = register_netdev(dev);
 691                         if (!err) {
 692                                 struct net_device *slave = NULL;
 693                                 unsigned long smp_flags=0;
 694
 695                                 lock_adapter_irq(&wandev->lock, &smp_flags);
 696
 697                                 if (wandev->dev == NULL) {
 698                                         wandev->dev = dev;
 699                                 } else {
 700                                         for (slave=wandev->dev;
 701                                          *((struct net_device **)slave->priv);
 702                                  slave = *((struct net_device **)slave->priv));
 703
 704                                      *((struct net_device **)slave->priv) = dev;
 705                                 }
 706                                 ++wandev->ndev;
 707
 708                                 unlock_adapter_irq(&wandev->lock, &smp_flags);
 709                                 err = 0;        /* done !!! */
 710                                 goto out;
 711                         }
 712                 }
 713                 if (wandev->del_if)
 714                         wandev->del_if(wandev, dev);
 715         }
 716
 717         /* This code has moved from del_if() function */
 718         kfree(dev->priv);
 719         dev->priv = NULL;
 720
 721 #ifdef CONFIG_WANPIPE_MULTPPP
 722         if (cnf->config_id == WANCONFIG_MPPP)
 723                 kfree(pppdev);
 724         else
 725                 kfree(dev);
 726 #else
 727         /* Sync PPP is disabled */
 728         if (cnf->config_id != WANCONFIG_MPPP)
 729                 kfree(dev);
 730 #endif
 731
 732 out:
 733         kfree(cnf);
 734         return err;
 735 }
 736
 737
 738 /*
 739  *      Delete WAN logical channel.
 740  *       o verify user address space
 741  *       o copy configuration data to kernel address space
 742  */
 743
 744 static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
 745 {
 746         char name[WAN_IFNAME_SZ + 1];
 747         int err = 0;
 748
 749         if (wandev->state == WAN_UNCONFIGURED)
 750                 return -ENODEV;
 751
 752         memset(name, 0, sizeof(name));
 753
 754         if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
 755                 return -EFAULT;
 756
 757         err = wanrouter_delete_interface(wandev, name);
 758         if (err)
 759                 return err;
 760
 761         /* If last interface being deleted, shutdown card
 762          * This helps with administration at leaf nodes
 763          * (You can tell if the person at the other end of the phone
 764          * has an interface configured) and avoids DoS vulnerabilities
 765          * in binary driver files - this fixes a problem with the current
 766          * Sangoma driver going into strange states when all the network
 767          * interfaces are deleted and the link irrecoverably disconnected.
 768          */
 769
 770         if (!wandev->ndev && wandev->shutdown)
 771                 err = wandev->shutdown(wandev);
 772
 773         return err;
 774 }
 775
 776 /*
 777  *      Miscellaneous Functions
 778  */
 779
 780 /*
 781  *      Find WAN device by name.
 782  *      Return pointer to the WAN device data space or NULL if device not found.
 783  */
 784
 785 static struct wan_device *wanrouter_find_device(char *name)
 786 {
 787         struct wan_device *wandev;
 788
 789         for (wandev = wanrouter_router_devlist;
 790              wandev && strcmp(wandev->name, name);
 791                 wandev = wandev->next);
 792         return wandev;
 793 }
 794
 795 /*
 796  *      Delete WAN logical channel identified by its name.
 797  *      o find logical channel by its name
 798  *      o call driver's del_if() entry point
 799  *      o unregister network interface
 800  *      o unlink channel data space from linked list of channels
 801  *      o release channel data space
 802  *
 803  *      Return: 0               success
 804  *              -ENODEV         channel not found.
 805  *              -EBUSY          interface is open
 806  *
 807  *      Note: If (force != 0), then device will be destroyed even if interface
 808  *      associated with it is open. It's caller's responsibility to make
 809  *      sure that opened interfaces are not removed!
 810  */
 811
 812 static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
 813 {
 814         struct net_device *dev = NULL, *prev = NULL;
 815         unsigned long smp_flags=0;
 816
 817         lock_adapter_irq(&wandev->lock, &smp_flags);
 818         dev = wandev->dev;
 819         prev = NULL;
 820         while (dev && strcmp(name, dev->name)) {
 821                 struct net_device **slave = dev->priv;
 822                 prev = dev;
 823                 dev = *slave;
 824         }
 825         unlock_adapter_irq(&wandev->lock, &smp_flags);
 826
 827         if (dev == NULL)
 828                 return -ENODEV; /* interface not found */
 829
 830         if (netif_running(dev))
 831                 return -EBUSY;  /* interface in use */
 832
 833         if (wandev->del_if)
 834                 wandev->del_if(wandev, dev);
 835
 836         lock_adapter_irq(&wandev->lock, &smp_flags);
 837         if (prev) {
 838                 struct net_device **prev_slave = prev->priv;
 839                 struct net_device **slave = dev->priv;
 840
 841                 *prev_slave = *slave;
 842         } else {
 843                 struct net_device **slave = dev->priv;
 844                 wandev->dev = *slave;
 845         }
 846         --wandev->ndev;
 847         unlock_adapter_irq(&wandev->lock, &smp_flags);
 848
 849         printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
 850
 851         /* Due to new interface linking method using dev->priv,
 852          * this code has moved from del_if() function.*/
 853         kfree(dev->priv);
 854         dev->priv=NULL;
 855
 856         unregister_netdev(dev);
 857
 858         free_netdev(dev);
 859
 860         return 0;
 861 }
 862
 863 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
 864 {
 865         spin_lock_irqsave(lock, *smp_flags);
 866 }
 867
 868
 869 void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
 870 {
 871         spin_unlock_irqrestore(lock, *smp_flags);
 872 }
 873
 874 EXPORT_SYMBOL(register_wan_device);
 875 EXPORT_SYMBOL(unregister_wan_device);
 876 EXPORT_SYMBOL(wanrouter_encapsulate);
 877 EXPORT_SYMBOL(wanrouter_type_trans);
 878 EXPORT_SYMBOL(lock_adapter_irq);
 879 EXPORT_SYMBOL(unlock_adapter_irq);
 880
 881 MODULE_LICENSE("GPL");
 882
 883 /*
 884  *      End
 885  */