7f07152bc109e579118870d03f150e7620fd8725
[linux-2.6.git] / 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 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/mm.h>
52 #include <linux/string.h>       /* inline mem*, str* functions */
53
54 #include <asm/byteorder.h>      /* htons(), etc. */
55 #include <linux/wanrouter.h>    /* WAN router API definitions */
56
57 #include <linux/vmalloc.h>      /* vmalloc, vfree */
58 #include <asm/uaccess.h>        /* copy_to/from_user */
59 #include <linux/init.h>         /* __initfunc et al. */
60
61 #define KMEM_SAFETYZONE 8
62
63 /*
64  *      Function Prototypes
65  */
66
67 /*
68  *      WAN device IOCTL handlers
69  */
70
71 static int wanrouter_device_setup(struct wan_device *wandev,
72                                   wandev_conf_t __user *u_conf);
73 static int wanrouter_device_stat(struct wan_device *wandev,
74                                  wandev_stat_t __user *u_stat);
75 static int wanrouter_device_shutdown(struct wan_device *wandev);
76 static int wanrouter_device_new_if(struct wan_device *wandev,
77                                    wanif_conf_t __user *u_conf);
78 static int wanrouter_device_del_if(struct wan_device *wandev,
79                                    char __user *u_name);
80
81 /*
82  *      Miscellaneous
83  */
84
85 static struct wan_device *wanrouter_find_device(char *name);
86 static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
87 static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
88 static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
89
90
91
92 /*
93  *      Global Data
94  */
95
96 static char wanrouter_fullname[]  = "Sangoma WANPIPE Router";
97 static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
98 static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
99 struct wan_device* wanrouter_router_devlist; /* list of registered devices */
100
101 /*
102  *      Organize Unique Identifiers for encapsulation/decapsulation
103  */
104
105 #if 0
106 static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
107 static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
108 #endif
109
110 static int __init wanrouter_init(void)
111 {
112         int err;
113
114         printk(KERN_INFO "%s v%u.%u %s\n",
115                wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
116                wanrouter_copyright);
117
118         err = wanrouter_proc_init();
119         if (err)
120                 printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
121                        wanrouter_modname);
122
123         return err;
124 }
125
126 static void __exit wanrouter_cleanup (void)
127 {
128         wanrouter_proc_cleanup();
129 }
130
131 /*
132  * This is just plain dumb.  We should move the bugger to drivers/net/wan,
133  * slap it first in directory and make it module_init().  The only reason
134  * for subsys_initcall() here is that net goes after drivers (why, BTW?)
135  */
136 subsys_initcall(wanrouter_init);
137 module_exit(wanrouter_cleanup);
138
139 /*
140  *      Kernel APIs
141  */
142
143 /*
144  *      Register WAN device.
145  *      o verify device credentials
146  *      o create an entry for the device in the /proc/net/router directory
147  *      o initialize internally maintained fields of the wan_device structure
148  *      o link device data space to a singly-linked list
149  *      o if it's the first device, then start kernel 'thread'
150  *      o increment module use count
151  *
152  *      Return:
153  *      0       Ok
154  *      < 0     error.
155  *
156  *      Context:        process
157  */
158
159
160 int register_wan_device(struct wan_device *wandev)
161 {
162         int err, namelen;
163
164         if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
165             (wandev->name == NULL))
166                 return -EINVAL;
167
168         namelen = strlen(wandev->name);
169         if (!namelen || (namelen > WAN_DRVNAME_SZ))
170                 return -EINVAL;
171
172         if (wanrouter_find_device(wandev->name))
173                 return -EEXIST;
174
175 #ifdef WANDEBUG
176         printk(KERN_INFO "%s: registering WAN device %s\n",
177                wanrouter_modname, wandev->name);
178 #endif
179
180         /*
181          *      Register /proc directory entry
182          */
183         err = wanrouter_proc_add(wandev);
184         if (err) {
185                 printk(KERN_INFO
186                         "%s: can't create /proc/net/router/%s entry!\n",
187                         wanrouter_modname, wandev->name);
188                 return err;
189         }
190
191         /*
192          *      Initialize fields of the wan_device structure maintained by the
193          *      router and update local data.
194          */
195
196         wandev->ndev = 0;
197         wandev->dev  = NULL;
198         wandev->next = wanrouter_router_devlist;
199         wanrouter_router_devlist = wandev;
200         return 0;
201 }
202
203 /*
204  *      Unregister WAN device.
205  *      o shut down device
206  *      o unlink device data space from the linked list
207  *      o delete device entry in the /proc/net/router directory
208  *      o decrement module use count
209  *
210  *      Return:         0       Ok
211  *                      <0      error.
212  *      Context:        process
213  */
214
215
216 int unregister_wan_device(char *name)
217 {
218         struct wan_device *wandev, *prev;
219
220         if (name == NULL)
221                 return -EINVAL;
222
223         for (wandev = wanrouter_router_devlist, prev = NULL;
224                 wandev && strcmp(wandev->name, name);
225                 prev = wandev, wandev = wandev->next)
226                 ;
227         if (wandev == NULL)
228                 return -ENODEV;
229
230 #ifdef WANDEBUG
231         printk(KERN_INFO "%s: unregistering WAN device %s\n",
232                wanrouter_modname, name);
233 #endif
234
235         if (wandev->state != WAN_UNCONFIGURED)
236                 wanrouter_device_shutdown(wandev);
237
238         if (prev)
239                 prev->next = wandev->next;
240         else
241                 wanrouter_router_devlist = wandev->next;
242
243         wanrouter_proc_delete(wandev);
244         return 0;
245 }
246
247 #if 0
248
249 /*
250  *      Encapsulate packet.
251  *
252  *      Return: encapsulation header size
253  *              < 0     - unsupported Ethertype
254  *
255  *      Notes:
256  *      1. This function may be called on interrupt context.
257  */
258
259
260 int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
261                           unsigned short type)
262 {
263         int hdr_len = 0;
264
265         switch (type) {
266         case ETH_P_IP:          /* IP datagram encapsulation */
267                 hdr_len += 1;
268                 skb_push(skb, 1);
269                 skb->data[0] = NLPID_IP;
270                 break;
271
272         case ETH_P_IPX:         /* SNAP encapsulation */
273         case ETH_P_ARP:
274                 hdr_len += 7;
275                 skb_push(skb, 7);
276                 skb->data[0] = 0;
277                 skb->data[1] = NLPID_SNAP;
278                 skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether,
279                                                sizeof(wanrouter_oui_ether));
280                 *((unsigned short*)&skb->data[5]) = htons(type);
281                 break;
282
283         default:                /* Unknown packet type */
284                 printk(KERN_INFO
285                         "%s: unsupported Ethertype 0x%04X on interface %s!\n",
286                         wanrouter_modname, type, dev->name);
287                 hdr_len = -EINVAL;
288         }
289         return hdr_len;
290 }
291
292
293 /*
294  *      Decapsulate packet.
295  *
296  *      Return: Ethertype (in network order)
297  *                      0       unknown encapsulation
298  *
299  *      Notes:
300  *      1. This function may be called on interrupt context.
301  */
302
303
304 __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
305 {
306         int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
307         __be16 ethertype;
308
309         switch (skb->data[cnt]) {
310         case NLPID_IP:          /* IP datagramm */
311                 ethertype = htons(ETH_P_IP);
312                 cnt += 1;
313                 break;
314
315         case NLPID_SNAP:        /* SNAP encapsulation */
316                 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
317                            sizeof(wanrouter_oui_ether))){
318                         printk(KERN_INFO
319                                 "%s: unsupported SNAP OUI %02X-%02X-%02X "
320                                 "on interface %s!\n", wanrouter_modname,
321                                 skb->data[cnt+1], skb->data[cnt+2],
322                                 skb->data[cnt+3], dev->name);
323                         return 0;
324                 }
325                 ethertype = *((__be16*)&skb->data[cnt+4]);
326                 cnt += 6;
327                 break;
328
329         /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
330
331         default:
332                 printk(KERN_INFO
333                         "%s: unsupported NLPID 0x%02X on interface %s!\n",
334                         wanrouter_modname, skb->data[cnt], dev->name);
335                 return 0;
336         }
337         skb->protocol = ethertype;
338         skb->pkt_type = PACKET_HOST;    /*      Physically point to point */
339         skb_pull(skb, cnt);
340         skb_reset_mac_header(skb);
341         return ethertype;
342 }
343
344 #endif  /*  0  */
345
346 /*
347  *      WAN device IOCTL.
348  *      o find WAN device associated with this node
349  *      o execute requested action or pass command to the device driver
350  */
351
352 long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
353 {
354         struct inode *inode = file->f_path.dentry->d_inode;
355         int err = 0;
356         struct proc_dir_entry *dent;
357         struct wan_device *wandev;
358         void __user *data = (void __user *)arg;
359
360         if (!capable(CAP_NET_ADMIN))
361                 return -EPERM;
362
363         if ((cmd >> 8) != ROUTER_IOCTL)
364                 return -EINVAL;
365
366         dent = PDE(inode);
367         if ((dent == NULL) || (dent->data == NULL))
368                 return -EINVAL;
369
370         wandev = dent->data;
371         if (wandev->magic != ROUTER_MAGIC)
372                 return -EINVAL;
373
374         lock_kernel();
375         switch (cmd) {
376         case ROUTER_SETUP:
377                 err = wanrouter_device_setup(wandev, data);
378                 break;
379
380         case ROUTER_DOWN:
381                 err = wanrouter_device_shutdown(wandev);
382                 break;
383
384         case ROUTER_STAT:
385                 err = wanrouter_device_stat(wandev, data);
386                 break;
387
388         case ROUTER_IFNEW:
389                 err = wanrouter_device_new_if(wandev, data);
390                 break;
391
392         case ROUTER_IFDEL:
393                 err = wanrouter_device_del_if(wandev, data);
394                 break;
395
396         case ROUTER_IFSTAT:
397                 break;
398
399         default:
400                 if ((cmd >= ROUTER_USER) &&
401                     (cmd <= ROUTER_USER_MAX) &&
402                     wandev->ioctl)
403                         err = wandev->ioctl(wandev, cmd, arg);
404                 else err = -EINVAL;
405         }
406         unlock_kernel();
407         return err;
408 }
409
410 /*
411  *      WAN Driver IOCTL Handlers
412  */
413
414 /*
415  *      Setup WAN link device.
416  *      o verify user address space
417  *      o allocate kernel memory and copy configuration data to kernel space
418  *      o if configuration data includes extension, copy it to kernel space too
419  *      o call driver's setup() entry point
420  */
421
422 static int wanrouter_device_setup(struct wan_device *wandev,
423                                   wandev_conf_t __user *u_conf)
424 {
425         void *data = NULL;
426         wandev_conf_t *conf;
427         int err = -EINVAL;
428
429         if (wandev->setup == NULL) {    /* Nothing to do ? */
430                 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
431                                 wandev->name);
432                 return 0;
433         }
434
435         conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
436         if (conf == NULL){
437                 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
438                                 wandev->name);
439                 return -ENOBUFS;
440         }
441
442         if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
443                 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
444                                 wandev->name);
445                 kfree(conf);
446                 return -EFAULT;
447         }
448
449         if (conf->magic != ROUTER_MAGIC) {
450                 kfree(conf);
451                 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
452                                 wandev->name);
453                 return -EINVAL;
454         }
455
456         if (conf->data_size && conf->data) {
457                 if (conf->data_size > 128000) {
458                         printk(KERN_INFO
459                             "%s: ERROR, Invalid firmware data size %i !\n",
460                                         wandev->name, conf->data_size);
461                         kfree(conf);
462                         return -EINVAL;
463                 }
464
465                 data = vmalloc(conf->data_size);
466                 if (!data) {
467                         printk(KERN_INFO
468                                 "%s: ERROR, Faild allocate kernel memory !\n",
469                                 wandev->name);
470                         kfree(conf);
471                         return -ENOBUFS;
472                 }
473                 if (!copy_from_user(data, conf->data, conf->data_size)) {
474                         conf->data = data;
475                         err = wandev->setup(wandev, conf);
476                 } else {
477                         printk(KERN_INFO
478                              "%s: ERROR, Faild to copy from user data !\n",
479                                wandev->name);
480                         err = -EFAULT;
481                 }
482                 vfree(data);
483         } else {
484                 printk(KERN_INFO
485                     "%s: ERROR, No firmware found ! Firmware size = %i !\n",
486                                 wandev->name, conf->data_size);
487         }
488
489         kfree(conf);
490         return err;
491 }
492
493 /*
494  *      Shutdown WAN device.
495  *      o delete all not opened logical channels for this device
496  *      o call driver's shutdown() entry point
497  */
498
499 static int wanrouter_device_shutdown(struct wan_device *wandev)
500 {
501         struct net_device *dev;
502         int err=0;
503
504         if (wandev->state == WAN_UNCONFIGURED)
505                 return 0;
506
507         printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
508
509         for (dev = wandev->dev; dev;) {
510                 err = wanrouter_delete_interface(wandev, dev->name);
511                 if (err)
512                         return err;
513                 /* The above function deallocates the current dev
514                  * structure. Therefore, we cannot use dev->priv
515                  * as the next element: wandev->dev points to the
516                  * next element */
517                 dev = wandev->dev;
518         }
519
520         if (wandev->ndev)
521                 return -EBUSY;  /* there are opened interfaces  */
522
523         if (wandev->shutdown)
524                 err=wandev->shutdown(wandev);
525
526         return err;
527 }
528
529 /*
530  *      Get WAN device status & statistics.
531  */
532
533 static int wanrouter_device_stat(struct wan_device *wandev,
534                                  wandev_stat_t __user *u_stat)
535 {
536         wandev_stat_t stat;
537
538         memset(&stat, 0, sizeof(stat));
539
540         /* Ask device driver to update device statistics */
541         if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
542                 wandev->update(wandev);
543
544         /* Fill out structure */
545         stat.ndev  = wandev->ndev;
546         stat.state = wandev->state;
547
548         if (copy_to_user(u_stat, &stat, sizeof(stat)))
549                 return -EFAULT;
550
551         return 0;
552 }
553
554 /*
555  *      Create new WAN interface.
556  *      o verify user address space
557  *      o copy configuration data to kernel address space
558  *      o allocate network interface data space
559  *      o call driver's new_if() entry point
560  *      o make sure there is no interface name conflict
561  *      o register network interface
562  */
563
564 static int wanrouter_device_new_if(struct wan_device *wandev,
565                                    wanif_conf_t __user *u_conf)
566 {
567         wanif_conf_t *cnf;
568         struct net_device *dev = NULL;
569         int err;
570
571         if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
572                 return -ENODEV;
573
574         cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
575         if (!cnf)
576                 return -ENOBUFS;
577
578         err = -EFAULT;
579         if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
580                 goto out;
581
582         err = -EINVAL;
583         if (cnf->magic != ROUTER_MAGIC)
584                 goto out;
585
586         if (cnf->config_id == WANCONFIG_MPPP) {
587                 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
588                                 wandev->name);
589                 err = -EPROTONOSUPPORT;
590                 goto out;
591         } else {
592                 dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
593                 err = -ENOBUFS;
594                 if (dev == NULL)
595                         goto out;
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                 if (dev->name == NULL) {
606                         err = -EINVAL;
607                 } else {
608
609                         #ifdef WANDEBUG
610                         printk(KERN_INFO "%s: registering interface %s...\n",
611                                 wanrouter_modname, dev->name);
612                         #endif
613
614                         err = register_netdev(dev);
615                         if (!err) {
616                                 struct net_device *slave = NULL;
617                                 unsigned long smp_flags=0;
618
619                                 lock_adapter_irq(&wandev->lock, &smp_flags);
620
621                                 if (wandev->dev == NULL) {
622                                         wandev->dev = dev;
623                                 } else {
624                                         for (slave=wandev->dev;
625                                          *((struct net_device **)slave->priv);
626                                  slave = *((struct net_device **)slave->priv));
627
628                                      *((struct net_device **)slave->priv) = dev;
629                                 }
630                                 ++wandev->ndev;
631
632                                 unlock_adapter_irq(&wandev->lock, &smp_flags);
633                                 err = 0;        /* done !!! */
634                                 goto out;
635                         }
636                 }
637                 if (wandev->del_if)
638                         wandev->del_if(wandev, dev);
639         }
640
641         /* This code has moved from del_if() function */
642         kfree(dev->priv);
643         dev->priv = NULL;
644
645         /* Sync PPP is disabled */
646         if (cnf->config_id != WANCONFIG_MPPP)
647                 kfree(dev);
648 out:
649         kfree(cnf);
650         return err;
651 }
652
653
654 /*
655  *      Delete WAN logical channel.
656  *       o verify user address space
657  *       o copy configuration data to kernel address space
658  */
659
660 static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
661 {
662         char name[WAN_IFNAME_SZ + 1];
663         int err = 0;
664
665         if (wandev->state == WAN_UNCONFIGURED)
666                 return -ENODEV;
667
668         memset(name, 0, sizeof(name));
669
670         if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
671                 return -EFAULT;
672
673         err = wanrouter_delete_interface(wandev, name);
674         if (err)
675                 return err;
676
677         /* If last interface being deleted, shutdown card
678          * This helps with administration at leaf nodes
679          * (You can tell if the person at the other end of the phone
680          * has an interface configured) and avoids DoS vulnerabilities
681          * in binary driver files - this fixes a problem with the current
682          * Sangoma driver going into strange states when all the network
683          * interfaces are deleted and the link irrecoverably disconnected.
684          */
685
686         if (!wandev->ndev && wandev->shutdown)
687                 err = wandev->shutdown(wandev);
688
689         return err;
690 }
691
692 /*
693  *      Miscellaneous Functions
694  */
695
696 /*
697  *      Find WAN device by name.
698  *      Return pointer to the WAN device data space or NULL if device not found.
699  */
700
701 static struct wan_device *wanrouter_find_device(char *name)
702 {
703         struct wan_device *wandev;
704
705         for (wandev = wanrouter_router_devlist;
706              wandev && strcmp(wandev->name, name);
707                 wandev = wandev->next);
708         return wandev;
709 }
710
711 /*
712  *      Delete WAN logical channel identified by its name.
713  *      o find logical channel by its name
714  *      o call driver's del_if() entry point
715  *      o unregister network interface
716  *      o unlink channel data space from linked list of channels
717  *      o release channel data space
718  *
719  *      Return: 0               success
720  *              -ENODEV         channel not found.
721  *              -EBUSY          interface is open
722  *
723  *      Note: If (force != 0), then device will be destroyed even if interface
724  *      associated with it is open. It's caller's responsibility to make
725  *      sure that opened interfaces are not removed!
726  */
727
728 static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
729 {
730         struct net_device *dev = NULL, *prev = NULL;
731         unsigned long smp_flags=0;
732
733         lock_adapter_irq(&wandev->lock, &smp_flags);
734         dev = wandev->dev;
735         prev = NULL;
736         while (dev && strcmp(name, dev->name)) {
737                 struct net_device **slave = dev->priv;
738                 prev = dev;
739                 dev = *slave;
740         }
741         unlock_adapter_irq(&wandev->lock, &smp_flags);
742
743         if (dev == NULL)
744                 return -ENODEV; /* interface not found */
745
746         if (netif_running(dev))
747                 return -EBUSY;  /* interface in use */
748
749         if (wandev->del_if)
750                 wandev->del_if(wandev, dev);
751
752         lock_adapter_irq(&wandev->lock, &smp_flags);
753         if (prev) {
754                 struct net_device **prev_slave = prev->priv;
755                 struct net_device **slave = dev->priv;
756
757                 *prev_slave = *slave;
758         } else {
759                 struct net_device **slave = dev->priv;
760                 wandev->dev = *slave;
761         }
762         --wandev->ndev;
763         unlock_adapter_irq(&wandev->lock, &smp_flags);
764
765         printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
766
767         /* Due to new interface linking method using dev->priv,
768          * this code has moved from del_if() function.*/
769         kfree(dev->priv);
770         dev->priv=NULL;
771
772         unregister_netdev(dev);
773
774         free_netdev(dev);
775
776         return 0;
777 }
778
779 static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
780 {
781         spin_lock_irqsave(lock, *smp_flags);
782 }
783
784
785 static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
786 {
787         spin_unlock_irqrestore(lock, *smp_flags);
788 }
789
790 EXPORT_SYMBOL(register_wan_device);
791 EXPORT_SYMBOL(unregister_wan_device);
792
793 MODULE_LICENSE("GPL");
794
795 /*
796  *      End
797  */