linux/net/wanrouter/wanmain.c
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   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 management (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/stddef.h>       /* offsetof(), etc. */
  46#include <linux/capability.h>
  47#include <linux/errno.h>        /* return codes */
  48#include <linux/kernel.h>
  49#include <linux/module.h>       /* support for loadable modules */
  50#include <linux/slab.h>         /* kmalloc(), kfree() */
  51#include <linux/mutex.h>
  52#include <linux/mm.h>
  53#include <linux/string.h>       /* inline mem*, str* functions */
  54
  55#include <asm/byteorder.h>      /* htons(), etc. */
  56#include <linux/wanrouter.h>    /* WAN router API definitions */
  57
  58#include <linux/vmalloc.h>      /* vmalloc, vfree */
  59#include <asm/uaccess.h>        /* copy_to/from_user */
  60#include <linux/init.h>         /* __initfunc et al. */
  61
  62#define DEV_TO_SLAVE(dev)       (*((struct net_device **)netdev_priv(dev)))
  63
  64/*
  65 *      Function Prototypes
  66 */
  67
  68/*
  69 *      WAN device IOCTL handlers
  70 */
  71
  72static DEFINE_MUTEX(wanrouter_mutex);
  73static int wanrouter_device_setup(struct wan_device *wandev,
  74                                  wandev_conf_t __user *u_conf);
  75static int wanrouter_device_stat(struct wan_device *wandev,
  76                                 wandev_stat_t __user *u_stat);
  77static int wanrouter_device_shutdown(struct wan_device *wandev);
  78static int wanrouter_device_new_if(struct wan_device *wandev,
  79                                   wanif_conf_t __user *u_conf);
  80static int wanrouter_device_del_if(struct wan_device *wandev,
  81                                   char __user *u_name);
  82
  83/*
  84 *      Miscellaneous
  85 */
  86
  87static struct wan_device *wanrouter_find_device(char *name);
  88static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
  89static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
  90        __acquires(lock);
  91static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
  92        __releases(lock);
  93
  94
  95
  96/*
  97 *      Global Data
  98 */
  99
 100static char wanrouter_fullname[]  = "Sangoma WANPIPE Router";
 101static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
 102static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
 103struct wan_device* wanrouter_router_devlist; /* list of registered devices */
 104
 105/*
 106 *      Organize Unique Identifiers for encapsulation/decapsulation
 107 */
 108
 109#if 0
 110static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
 111static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
 112#endif
 113
 114static int __init wanrouter_init(void)
 115{
 116        int err;
 117
 118        printk(KERN_INFO "%s v%u.%u %s\n",
 119               wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
 120               wanrouter_copyright);
 121
 122        err = wanrouter_proc_init();
 123        if (err)
 124                printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
 125                       wanrouter_modname);
 126
 127        return err;
 128}
 129
 130static void __exit wanrouter_cleanup (void)
 131{
 132        wanrouter_proc_cleanup();
 133}
 134
 135/*
 136 * This is just plain dumb.  We should move the bugger to drivers/net/wan,
 137 * slap it first in directory and make it module_init().  The only reason
 138 * for subsys_initcall() here is that net goes after drivers (why, BTW?)
 139 */
 140subsys_initcall(wanrouter_init);
 141module_exit(wanrouter_cleanup);
 142
 143/*
 144 *      Kernel APIs
 145 */
 146
 147/*
 148 *      Register WAN device.
 149 *      o verify device credentials
 150 *      o create an entry for the device in the /proc/net/router directory
 151 *      o initialize internally maintained fields of the wan_device structure
 152 *      o link device data space to a singly-linked list
 153 *      o if it's the first device, then start kernel 'thread'
 154 *      o increment module use count
 155 *
 156 *      Return:
 157 *      0       Ok
 158 *      < 0     error.
 159 *
 160 *      Context:        process
 161 */
 162
 163
 164int register_wan_device(struct wan_device *wandev)
 165{
 166        int err, namelen;
 167
 168        if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
 169            (wandev->name == NULL))
 170                return -EINVAL;
 171
 172        namelen = strlen(wandev->name);
 173        if (!namelen || (namelen > WAN_DRVNAME_SZ))
 174                return -EINVAL;
 175
 176        if (wanrouter_find_device(wandev->name))
 177                return -EEXIST;
 178
 179#ifdef WANDEBUG
 180        printk(KERN_INFO "%s: registering WAN device %s\n",
 181               wanrouter_modname, wandev->name);
 182#endif
 183
 184        /*
 185         *      Register /proc directory entry
 186         */
 187        err = wanrouter_proc_add(wandev);
 188        if (err) {
 189                printk(KERN_INFO
 190                        "%s: can't create /proc/net/router/%s entry!\n",
 191                        wanrouter_modname, wandev->name);
 192                return err;
 193        }
 194
 195        /*
 196         *      Initialize fields of the wan_device structure maintained by the
 197         *      router and update local data.
 198         */
 199
 200        wandev->ndev = 0;
 201        wandev->dev  = NULL;
 202        wandev->next = wanrouter_router_devlist;
 203        wanrouter_router_devlist = wandev;
 204        return 0;
 205}
 206
 207/*
 208 *      Unregister WAN device.
 209 *      o shut down device
 210 *      o unlink device data space from the linked list
 211 *      o delete device entry in the /proc/net/router directory
 212 *      o decrement module use count
 213 *
 214 *      Return:         0       Ok
 215 *                      <0      error.
 216 *      Context:        process
 217 */
 218
 219
 220int unregister_wan_device(char *name)
 221{
 222        struct wan_device *wandev, *prev;
 223
 224        if (name == NULL)
 225                return -EINVAL;
 226
 227        for (wandev = wanrouter_router_devlist, prev = NULL;
 228                wandev && strcmp(wandev->name, name);
 229                prev = wandev, wandev = wandev->next)
 230                ;
 231        if (wandev == NULL)
 232                return -ENODEV;
 233
 234#ifdef WANDEBUG
 235        printk(KERN_INFO "%s: unregistering WAN device %s\n",
 236               wanrouter_modname, name);
 237#endif
 238
 239        if (wandev->state != WAN_UNCONFIGURED)
 240                wanrouter_device_shutdown(wandev);
 241
 242        if (prev)
 243                prev->next = wandev->next;
 244        else
 245                wanrouter_router_devlist = wandev->next;
 246
 247        wanrouter_proc_delete(wandev);
 248        return 0;
 249}
 250
 251#if 0
 252
 253/*
 254 *      Encapsulate packet.
 255 *
 256 *      Return: encapsulation header size
 257 *              < 0     - unsupported Ethertype
 258 *
 259 *      Notes:
 260 *      1. This function may be called on interrupt context.
 261 */
 262
 263
 264int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
 265                          unsigned short type)
 266{
 267        int hdr_len = 0;
 268
 269        switch (type) {
 270        case ETH_P_IP:          /* IP datagram encapsulation */
 271                hdr_len += 1;
 272                skb_push(skb, 1);
 273                skb->data[0] = NLPID_IP;
 274                break;
 275
 276        case ETH_P_IPX:         /* SNAP encapsulation */
 277        case ETH_P_ARP:
 278                hdr_len += 7;
 279                skb_push(skb, 7);
 280                skb->data[0] = 0;
 281                skb->data[1] = NLPID_SNAP;
 282                skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether,
 283                                               sizeof(wanrouter_oui_ether));
 284                *((unsigned short*)&skb->data[5]) = htons(type);
 285                break;
 286
 287        default:                /* Unknown packet type */
 288                printk(KERN_INFO
 289                        "%s: unsupported Ethertype 0x%04X on interface %s!\n",
 290                        wanrouter_modname, type, dev->name);
 291                hdr_len = -EINVAL;
 292        }
 293        return hdr_len;
 294}
 295
 296
 297/*
 298 *      Decapsulate packet.
 299 *
 300 *      Return: Ethertype (in network order)
 301 *                      0       unknown encapsulation
 302 *
 303 *      Notes:
 304 *      1. This function may be called on interrupt context.
 305 */
 306
 307
 308__be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
 309{
 310        int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
 311        __be16 ethertype;
 312
 313        switch (skb->data[cnt]) {
 314        case NLPID_IP:          /* IP datagramm */
 315                ethertype = htons(ETH_P_IP);
 316                cnt += 1;
 317                break;
 318
 319        case NLPID_SNAP:        /* SNAP encapsulation */
 320                if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
 321                           sizeof(wanrouter_oui_ether))){
 322                        printk(KERN_INFO
 323                                "%s: unsupported SNAP OUI %02X-%02X-%02X "
 324                                "on interface %s!\n", wanrouter_modname,
 325                                skb->data[cnt+1], skb->data[cnt+2],
 326                                skb->data[cnt+3], dev->name);
 327                        return 0;
 328                }
 329                ethertype = *((__be16*)&skb->data[cnt+4]);
 330                cnt += 6;
 331                break;
 332
 333        /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
 334
 335        default:
 336                printk(KERN_INFO
 337                        "%s: unsupported NLPID 0x%02X on interface %s!\n",
 338                        wanrouter_modname, skb->data[cnt], dev->name);
 339                return 0;
 340        }
 341        skb->protocol = ethertype;
 342        skb->pkt_type = PACKET_HOST;    /*      Physically point to point */
 343        skb_pull(skb, cnt);
 344        skb_reset_mac_header(skb);
 345        return ethertype;
 346}
 347
 348#endif  /*  0  */
 349
 350/*
 351 *      WAN device IOCTL.
 352 *      o find WAN device associated with this node
 353 *      o execute requested action or pass command to the device driver
 354 */
 355
 356long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 357{
 358        struct inode *inode = file->f_path.dentry->d_inode;
 359        int err = 0;
 360        struct proc_dir_entry *dent;
 361        struct wan_device *wandev;
 362        void __user *data = (void __user *)arg;
 363
 364        if (!capable(CAP_NET_ADMIN))
 365                return -EPERM;
 366
 367        if ((cmd >> 8) != ROUTER_IOCTL)
 368                return -EINVAL;
 369
 370        dent = PDE(inode);
 371        if ((dent == NULL) || (dent->data == NULL))
 372                return -EINVAL;
 373
 374        wandev = dent->data;
 375        if (wandev->magic != ROUTER_MAGIC)
 376                return -EINVAL;
 377
 378        mutex_lock(&wanrouter_mutex);
 379        switch (cmd) {
 380        case ROUTER_SETUP:
 381                err = wanrouter_device_setup(wandev, data);
 382                break;
 383
 384        case ROUTER_DOWN:
 385                err = wanrouter_device_shutdown(wandev);
 386                break;
 387
 388        case ROUTER_STAT:
 389                err = wanrouter_device_stat(wandev, data);
 390                break;
 391
 392        case ROUTER_IFNEW:
 393                err = wanrouter_device_new_if(wandev, data);
 394                break;
 395
 396        case ROUTER_IFDEL:
 397                err = wanrouter_device_del_if(wandev, data);
 398                break;
 399
 400        case ROUTER_IFSTAT:
 401                break;
 402
 403        default:
 404                if ((cmd >= ROUTER_USER) &&
 405                    (cmd <= ROUTER_USER_MAX) &&
 406                    wandev->ioctl)
 407                        err = wandev->ioctl(wandev, cmd, arg);
 408                else err = -EINVAL;
 409        }
 410        mutex_unlock(&wanrouter_mutex);
 411        return err;
 412}
 413
 414/*
 415 *      WAN Driver IOCTL Handlers
 416 */
 417
 418/*
 419 *      Setup WAN link device.
 420 *      o verify user address space
 421 *      o allocate kernel memory and copy configuration data to kernel space
 422 *      o if configuration data includes extension, copy it to kernel space too
 423 *      o call driver's setup() entry point
 424 */
 425
 426static int wanrouter_device_setup(struct wan_device *wandev,
 427                                  wandev_conf_t __user *u_conf)
 428{
 429        void *data = NULL;
 430        wandev_conf_t *conf;
 431        int err = -EINVAL;
 432
 433        if (wandev->setup == NULL) {    /* Nothing to do ? */
 434                printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
 435                                wandev->name);
 436                return 0;
 437        }
 438
 439        conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
 440        if (conf == NULL){
 441                printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
 442                                wandev->name);
 443                return -ENOBUFS;
 444        }
 445
 446        if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
 447                printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
 448                                wandev->name);
 449                kfree(conf);
 450                return -EFAULT;
 451        }
 452
 453        if (conf->magic != ROUTER_MAGIC) {
 454                kfree(conf);
 455                printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
 456                                wandev->name);
 457                return -EINVAL;
 458        }
 459
 460        if (conf->data_size && conf->data) {
 461                if (conf->data_size > 128000) {
 462                        printk(KERN_INFO
 463                            "%s: ERROR, Invalid firmware data size %i !\n",
 464                                        wandev->name, conf->data_size);
 465                        kfree(conf);
 466                        return -EINVAL;
 467                }
 468
 469                data = vmalloc(conf->data_size);
 470                if (!data) {
 471                        printk(KERN_INFO
 472                                "%s: ERROR, Failed allocate kernel memory !\n",
 473                                wandev->name);
 474                        kfree(conf);
 475                        return -ENOBUFS;
 476                }
 477                if (!copy_from_user(data, conf->data, conf->data_size)) {
 478                        conf->data = data;
 479                        err = wandev->setup(wandev, conf);
 480                } else {
 481                        printk(KERN_INFO
 482                             "%s: ERROR, Failed to copy from user data !\n",
 483                               wandev->name);
 484                        err = -EFAULT;
 485                }
 486                vfree(data);
 487        } else {
 488                printk(KERN_INFO
 489                    "%s: ERROR, No firmware found ! Firmware size = %i !\n",
 490                                wandev->name, conf->data_size);
 491        }
 492
 493        kfree(conf);
 494        return err;
 495}
 496
 497/*
 498 *      Shutdown WAN device.
 499 *      o delete all not opened logical channels for this device
 500 *      o call driver's shutdown() entry point
 501 */
 502
 503static int wanrouter_device_shutdown(struct wan_device *wandev)
 504{
 505        struct net_device *dev;
 506        int err=0;
 507
 508        if (wandev->state == WAN_UNCONFIGURED)
 509                return 0;
 510
 511        printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
 512
 513        for (dev = wandev->dev; dev;) {
 514                err = wanrouter_delete_interface(wandev, dev->name);
 515                if (err)
 516                        return err;
 517                /* The above function deallocates the current dev
 518                 * structure. Therefore, we cannot use netdev_priv(dev)
 519                 * as the next element: wandev->dev points to the
 520                 * next element */
 521                dev = wandev->dev;
 522        }
 523
 524        if (wandev->ndev)
 525                return -EBUSY;  /* there are opened interfaces  */
 526
 527        if (wandev->shutdown)
 528                err=wandev->shutdown(wandev);
 529
 530        return err;
 531}
 532
 533/*
 534 *      Get WAN device status & statistics.
 535 */
 536
 537static int wanrouter_device_stat(struct wan_device *wandev,
 538                                 wandev_stat_t __user *u_stat)
 539{
 540        wandev_stat_t stat;
 541
 542        memset(&stat, 0, sizeof(stat));
 543
 544        /* Ask device driver to update device statistics */
 545        if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
 546                wandev->update(wandev);
 547
 548        /* Fill out structure */
 549        stat.ndev  = wandev->ndev;
 550        stat.state = wandev->state;
 551
 552        if (copy_to_user(u_stat, &stat, sizeof(stat)))
 553                return -EFAULT;
 554
 555        return 0;
 556}
 557
 558/*
 559 *      Create new WAN interface.
 560 *      o verify user address space
 561 *      o copy configuration data to kernel address space
 562 *      o allocate network interface data space
 563 *      o call driver's new_if() entry point
 564 *      o make sure there is no interface name conflict
 565 *      o register network interface
 566 */
 567
 568static int wanrouter_device_new_if(struct wan_device *wandev,
 569                                   wanif_conf_t __user *u_conf)
 570{
 571        wanif_conf_t *cnf;
 572        struct net_device *dev = NULL;
 573        int err;
 574
 575        if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
 576                return -ENODEV;
 577
 578        cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
 579        if (!cnf)
 580                return -ENOBUFS;
 581
 582        err = -EFAULT;
 583        if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
 584                goto out;
 585
 586        err = -EINVAL;
 587        if (cnf->magic != ROUTER_MAGIC)
 588                goto out;
 589
 590        if (cnf->config_id == WANCONFIG_MPPP) {
 591                printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
 592                                wandev->name);
 593                err = -EPROTONOSUPPORT;
 594                goto out;
 595        } else {
 596                err = wandev->new_if(wandev, dev, cnf);
 597        }
 598
 599        if (!err) {
 600                /* Register network interface. This will invoke init()
 601                 * function supplied by the driver.  If device registered
 602                 * successfully, add it to the interface list.
 603                 */
 604
 605#ifdef WANDEBUG
 606                printk(KERN_INFO "%s: registering interface %s...\n",
 607                       wanrouter_modname, dev->name);
 608#endif
 609
 610                err = register_netdev(dev);
 611                if (!err) {
 612                        struct net_device *slave = NULL;
 613                        unsigned long smp_flags=0;
 614
 615                        lock_adapter_irq(&wandev->lock, &smp_flags);
 616
 617                        if (wandev->dev == NULL) {
 618                                wandev->dev = dev;
 619                        } else {
 620                                for (slave=wandev->dev;
 621                                     DEV_TO_SLAVE(slave);
 622                                     slave = DEV_TO_SLAVE(slave))
 623                                        DEV_TO_SLAVE(slave) = dev;
 624                        }
 625                        ++wandev->ndev;
 626
 627                        unlock_adapter_irq(&wandev->lock, &smp_flags);
 628                        err = 0;        /* done !!! */
 629                        goto out;
 630                }
 631                if (wandev->del_if)
 632                        wandev->del_if(wandev, dev);
 633                free_netdev(dev);
 634        }
 635
 636out:
 637        kfree(cnf);
 638        return err;
 639}
 640
 641
 642/*
 643 *      Delete WAN logical channel.
 644 *       o verify user address space
 645 *       o copy configuration data to kernel address space
 646 */
 647
 648static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
 649{
 650        char name[WAN_IFNAME_SZ + 1];
 651        int err = 0;
 652
 653        if (wandev->state == WAN_UNCONFIGURED)
 654                return -ENODEV;
 655
 656        memset(name, 0, sizeof(name));
 657
 658        if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
 659                return -EFAULT;
 660
 661        err = wanrouter_delete_interface(wandev, name);
 662        if (err)
 663                return err;
 664
 665        /* If last interface being deleted, shutdown card
 666         * This helps with administration at leaf nodes
 667         * (You can tell if the person at the other end of the phone
 668         * has an interface configured) and avoids DoS vulnerabilities
 669         * in binary driver files - this fixes a problem with the current
 670         * Sangoma driver going into strange states when all the network
 671         * interfaces are deleted and the link irrecoverably disconnected.
 672         */
 673
 674        if (!wandev->ndev && wandev->shutdown)
 675                err = wandev->shutdown(wandev);
 676
 677        return err;
 678}
 679
 680/*
 681 *      Miscellaneous Functions
 682 */
 683
 684/*
 685 *      Find WAN device by name.
 686 *      Return pointer to the WAN device data space or NULL if device not found.
 687 */
 688
 689static struct wan_device *wanrouter_find_device(char *name)
 690{
 691        struct wan_device *wandev;
 692
 693        for (wandev = wanrouter_router_devlist;
 694             wandev && strcmp(wandev->name, name);
 695                wandev = wandev->next);
 696        return wandev;
 697}
 698
 699/*
 700 *      Delete WAN logical channel identified by its name.
 701 *      o find logical channel by its name
 702 *      o call driver's del_if() entry point
 703 *      o unregister network interface
 704 *      o unlink channel data space from linked list of channels
 705 *      o release channel data space
 706 *
 707 *      Return: 0               success
 708 *              -ENODEV         channel not found.
 709 *              -EBUSY          interface is open
 710 *
 711 *      Note: If (force != 0), then device will be destroyed even if interface
 712 *      associated with it is open. It's caller's responsibility to make
 713 *      sure that opened interfaces are not removed!
 714 */
 715
 716static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
 717{
 718        struct net_device *dev = NULL, *prev = NULL;
 719        unsigned long smp_flags=0;
 720
 721        lock_adapter_irq(&wandev->lock, &smp_flags);
 722        dev = wandev->dev;
 723        prev = NULL;
 724        while (dev && strcmp(name, dev->name)) {
 725                struct net_device **slave = netdev_priv(dev);
 726                prev = dev;
 727                dev = *slave;
 728        }
 729        unlock_adapter_irq(&wandev->lock, &smp_flags);
 730
 731        if (dev == NULL)
 732                return -ENODEV; /* interface not found */
 733
 734        if (netif_running(dev))
 735                return -EBUSY;  /* interface in use */
 736
 737        if (wandev->del_if)
 738                wandev->del_if(wandev, dev);
 739
 740        lock_adapter_irq(&wandev->lock, &smp_flags);
 741        if (prev) {
 742                struct net_device **prev_slave = netdev_priv(prev);
 743                struct net_device **slave = netdev_priv(dev);
 744
 745                *prev_slave = *slave;
 746        } else {
 747                struct net_device **slave = netdev_priv(dev);
 748                wandev->dev = *slave;
 749        }
 750        --wandev->ndev;
 751        unlock_adapter_irq(&wandev->lock, &smp_flags);
 752
 753        printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
 754
 755        unregister_netdev(dev);
 756
 757        free_netdev(dev);
 758
 759        return 0;
 760}
 761
 762static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
 763        __acquires(lock)
 764{
 765        spin_lock_irqsave(lock, *smp_flags);
 766}
 767
 768
 769static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
 770        __releases(lock)
 771{
 772        spin_unlock_irqrestore(lock, *smp_flags);
 773}
 774
 775EXPORT_SYMBOL(register_wan_device);
 776EXPORT_SYMBOL(unregister_wan_device);
 777
 778MODULE_LICENSE("GPL");
 779
 780/*
 781 *      End
 782 */
 783
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