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[mirror_ubuntu-zesty-kernel.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/init.h>
50 #include <linux/module.h> /* support for loadable modules */
51 #include <linux/slab.h> /* kmalloc(), kfree() */
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 #include <net/syncppp.h>
62
63 #define KMEM_SAFETYZONE 8
64
65 /*
66 * Function Prototypes
67 */
68
69 /*
70 * WAN device IOCTL handlers
71 */
72
73 static int wanrouter_device_setup(struct wan_device *wandev,
74 wandev_conf_t __user *u_conf);
75 static int wanrouter_device_stat(struct wan_device *wandev,
76 wandev_stat_t __user *u_stat);
77 static int wanrouter_device_shutdown(struct wan_device *wandev);
78 static int wanrouter_device_new_if(struct wan_device *wandev,
79 wanif_conf_t __user *u_conf);
80 static int wanrouter_device_del_if(struct wan_device *wandev,
81 char __user *u_name);
82
83 /*
84 * Miscellaneous
85 */
86
87 static struct wan_device *wanrouter_find_device(char *name);
88 static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
89 static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
90 static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
91
92
93
94 /*
95 * Global Data
96 */
97
98 static char wanrouter_fullname[] = "Sangoma WANPIPE Router";
99 static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
100 static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
101 struct wan_device* wanrouter_router_devlist; /* list of registered devices */
102
103 /*
104 * Organize Unique Identifiers for encapsulation/decapsulation
105 */
106
107 #if 0
108 static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
109 static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
110 #endif
111
112 static int __init wanrouter_init(void)
113 {
114 int err;
115
116 printk(KERN_INFO "%s v%u.%u %s\n",
117 wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
118 wanrouter_copyright);
119
120 err = wanrouter_proc_init();
121 if (err)
122 printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
123 wanrouter_modname);
124
125 return err;
126 }
127
128 static void __exit wanrouter_cleanup (void)
129 {
130 wanrouter_proc_cleanup();
131 }
132
133 /*
134 * This is just plain dumb. We should move the bugger to drivers/net/wan,
135 * slap it first in directory and make it module_init(). The only reason
136 * for subsys_initcall() here is that net goes after drivers (why, BTW?)
137 */
138 subsys_initcall(wanrouter_init);
139 module_exit(wanrouter_cleanup);
140
141 /*
142 * Kernel APIs
143 */
144
145 /*
146 * Register WAN device.
147 * o verify device credentials
148 * o create an entry for the device in the /proc/net/router directory
149 * o initialize internally maintained fields of the wan_device structure
150 * o link device data space to a singly-linked list
151 * o if it's the first device, then start kernel 'thread'
152 * o increment module use count
153 *
154 * Return:
155 * 0 Ok
156 * < 0 error.
157 *
158 * Context: process
159 */
160
161
162 int register_wan_device(struct wan_device *wandev)
163 {
164 int err, namelen;
165
166 if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
167 (wandev->name == NULL))
168 return -EINVAL;
169
170 namelen = strlen(wandev->name);
171 if (!namelen || (namelen > WAN_DRVNAME_SZ))
172 return -EINVAL;
173
174 if (wanrouter_find_device(wandev->name))
175 return -EEXIST;
176
177 #ifdef WANDEBUG
178 printk(KERN_INFO "%s: registering WAN device %s\n",
179 wanrouter_modname, wandev->name);
180 #endif
181
182 /*
183 * Register /proc directory entry
184 */
185 err = wanrouter_proc_add(wandev);
186 if (err) {
187 printk(KERN_INFO
188 "%s: can't create /proc/net/router/%s entry!\n",
189 wanrouter_modname, wandev->name);
190 return err;
191 }
192
193 /*
194 * Initialize fields of the wan_device structure maintained by the
195 * router and update local data.
196 */
197
198 wandev->ndev = 0;
199 wandev->dev = NULL;
200 wandev->next = wanrouter_router_devlist;
201 wanrouter_router_devlist = wandev;
202 return 0;
203 }
204
205 /*
206 * Unregister WAN device.
207 * o shut down device
208 * o unlink device data space from the linked list
209 * o delete device entry in the /proc/net/router directory
210 * o decrement module use count
211 *
212 * Return: 0 Ok
213 * <0 error.
214 * Context: process
215 */
216
217
218 int unregister_wan_device(char *name)
219 {
220 struct wan_device *wandev, *prev;
221
222 if (name == NULL)
223 return -EINVAL;
224
225 for (wandev = wanrouter_router_devlist, prev = NULL;
226 wandev && strcmp(wandev->name, name);
227 prev = wandev, wandev = wandev->next)
228 ;
229 if (wandev == NULL)
230 return -ENODEV;
231
232 #ifdef WANDEBUG
233 printk(KERN_INFO "%s: unregistering WAN device %s\n",
234 wanrouter_modname, name);
235 #endif
236
237 if (wandev->state != WAN_UNCONFIGURED)
238 wanrouter_device_shutdown(wandev);
239
240 if (prev)
241 prev->next = wandev->next;
242 else
243 wanrouter_router_devlist = wandev->next;
244
245 wanrouter_proc_delete(wandev);
246 return 0;
247 }
248
249 #if 0
250
251 /*
252 * Encapsulate packet.
253 *
254 * Return: encapsulation header size
255 * < 0 - unsupported Ethertype
256 *
257 * Notes:
258 * 1. This function may be called on interrupt context.
259 */
260
261
262 int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
263 unsigned short type)
264 {
265 int hdr_len = 0;
266
267 switch (type) {
268 case ETH_P_IP: /* IP datagram encapsulation */
269 hdr_len += 1;
270 skb_push(skb, 1);
271 skb->data[0] = NLPID_IP;
272 break;
273
274 case ETH_P_IPX: /* SNAP encapsulation */
275 case ETH_P_ARP:
276 hdr_len += 7;
277 skb_push(skb, 7);
278 skb->data[0] = 0;
279 skb->data[1] = NLPID_SNAP;
280 memcpy(&skb->data[2], wanrouter_oui_ether,
281 sizeof(wanrouter_oui_ether));
282 *((unsigned short*)&skb->data[5]) = htons(type);
283 break;
284
285 default: /* Unknown packet type */
286 printk(KERN_INFO
287 "%s: unsupported Ethertype 0x%04X on interface %s!\n",
288 wanrouter_modname, type, dev->name);
289 hdr_len = -EINVAL;
290 }
291 return hdr_len;
292 }
293
294
295 /*
296 * Decapsulate packet.
297 *
298 * Return: Ethertype (in network order)
299 * 0 unknown encapsulation
300 *
301 * Notes:
302 * 1. This function may be called on interrupt context.
303 */
304
305
306 __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
307 {
308 int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
309 __be16 ethertype;
310
311 switch (skb->data[cnt]) {
312 case NLPID_IP: /* IP datagramm */
313 ethertype = htons(ETH_P_IP);
314 cnt += 1;
315 break;
316
317 case NLPID_SNAP: /* SNAP encapsulation */
318 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
319 sizeof(wanrouter_oui_ether))){
320 printk(KERN_INFO
321 "%s: unsupported SNAP OUI %02X-%02X-%02X "
322 "on interface %s!\n", wanrouter_modname,
323 skb->data[cnt+1], skb->data[cnt+2],
324 skb->data[cnt+3], dev->name);
325 return 0;
326 }
327 ethertype = *((__be16*)&skb->data[cnt+4]);
328 cnt += 6;
329 break;
330
331 /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
332
333 default:
334 printk(KERN_INFO
335 "%s: unsupported NLPID 0x%02X on interface %s!\n",
336 wanrouter_modname, skb->data[cnt], dev->name);
337 return 0;
338 }
339 skb->protocol = ethertype;
340 skb->pkt_type = PACKET_HOST; /* Physically point to point */
341 skb_pull(skb, cnt);
342 skb_reset_mac_header(skb);
343 return ethertype;
344 }
345
346 #endif /* 0 */
347
348 /*
349 * WAN device IOCTL.
350 * o find WAN device associated with this node
351 * o execute requested action or pass command to the device driver
352 */
353
354 int wanrouter_ioctl(struct inode *inode, struct file *file,
355 unsigned int cmd, unsigned long arg)
356 {
357 int err = 0;
358 struct proc_dir_entry *dent;
359 struct wan_device *wandev;
360 void __user *data = (void __user *)arg;
361
362 if (!capable(CAP_NET_ADMIN))
363 return -EPERM;
364
365 if ((cmd >> 8) != ROUTER_IOCTL)
366 return -EINVAL;
367
368 dent = PDE(inode);
369 if ((dent == NULL) || (dent->data == NULL))
370 return -EINVAL;
371
372 wandev = dent->data;
373 if (wandev->magic != ROUTER_MAGIC)
374 return -EINVAL;
375
376 switch (cmd) {
377 case ROUTER_SETUP:
378 err = wanrouter_device_setup(wandev, data);
379 break;
380
381 case ROUTER_DOWN:
382 err = wanrouter_device_shutdown(wandev);
383 break;
384
385 case ROUTER_STAT:
386 err = wanrouter_device_stat(wandev, data);
387 break;
388
389 case ROUTER_IFNEW:
390 err = wanrouter_device_new_if(wandev, data);
391 break;
392
393 case ROUTER_IFDEL:
394 err = wanrouter_device_del_if(wandev, data);
395 break;
396
397 case ROUTER_IFSTAT:
398 break;
399
400 default:
401 if ((cmd >= ROUTER_USER) &&
402 (cmd <= ROUTER_USER_MAX) &&
403 wandev->ioctl)
404 err = wandev->ioctl(wandev, cmd, arg);
405 else err = -EINVAL;
406 }
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 || conf->data_size < 0) {
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 #ifdef CONFIG_WANPIPE_MULTPPP
570 struct ppp_device *pppdev=NULL;
571 #endif
572 int err;
573
574 if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
575 return -ENODEV;
576
577 cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
578 if (!cnf)
579 return -ENOBUFS;
580
581 err = -EFAULT;
582 if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
583 goto out;
584
585 err = -EINVAL;
586 if (cnf->magic != ROUTER_MAGIC)
587 goto out;
588
589 if (cnf->config_id == WANCONFIG_MPPP) {
590 #ifdef CONFIG_WANPIPE_MULTPPP
591 pppdev = kzalloc(sizeof(struct ppp_device), GFP_KERNEL);
592 err = -ENOBUFS;
593 if (pppdev == NULL)
594 goto out;
595 pppdev->dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
596 if (pppdev->dev == NULL) {
597 kfree(pppdev);
598 err = -ENOBUFS;
599 goto out;
600 }
601 err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
602 dev = pppdev->dev;
603 #else
604 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
605 wandev->name);
606 err = -EPROTONOSUPPORT;
607 goto out;
608 #endif
609 } else {
610 dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
611 err = -ENOBUFS;
612 if (dev == NULL)
613 goto out;
614 err = wandev->new_if(wandev, dev, cnf);
615 }
616
617 if (!err) {
618 /* Register network interface. This will invoke init()
619 * function supplied by the driver. If device registered
620 * successfully, add it to the interface list.
621 */
622
623 if (dev->name == NULL) {
624 err = -EINVAL;
625 } else {
626
627 #ifdef WANDEBUG
628 printk(KERN_INFO "%s: registering interface %s...\n",
629 wanrouter_modname, dev->name);
630 #endif
631
632 err = register_netdev(dev);
633 if (!err) {
634 struct net_device *slave = NULL;
635 unsigned long smp_flags=0;
636
637 lock_adapter_irq(&wandev->lock, &smp_flags);
638
639 if (wandev->dev == NULL) {
640 wandev->dev = dev;
641 } else {
642 for (slave=wandev->dev;
643 *((struct net_device **)slave->priv);
644 slave = *((struct net_device **)slave->priv));
645
646 *((struct net_device **)slave->priv) = dev;
647 }
648 ++wandev->ndev;
649
650 unlock_adapter_irq(&wandev->lock, &smp_flags);
651 err = 0; /* done !!! */
652 goto out;
653 }
654 }
655 if (wandev->del_if)
656 wandev->del_if(wandev, dev);
657 }
658
659 /* This code has moved from del_if() function */
660 kfree(dev->priv);
661 dev->priv = NULL;
662
663 #ifdef CONFIG_WANPIPE_MULTPPP
664 if (cnf->config_id == WANCONFIG_MPPP)
665 kfree(pppdev);
666 else
667 kfree(dev);
668 #else
669 /* Sync PPP is disabled */
670 if (cnf->config_id != WANCONFIG_MPPP)
671 kfree(dev);
672 #endif
673
674 out:
675 kfree(cnf);
676 return err;
677 }
678
679
680 /*
681 * Delete WAN logical channel.
682 * o verify user address space
683 * o copy configuration data to kernel address space
684 */
685
686 static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
687 {
688 char name[WAN_IFNAME_SZ + 1];
689 int err = 0;
690
691 if (wandev->state == WAN_UNCONFIGURED)
692 return -ENODEV;
693
694 memset(name, 0, sizeof(name));
695
696 if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
697 return -EFAULT;
698
699 err = wanrouter_delete_interface(wandev, name);
700 if (err)
701 return err;
702
703 /* If last interface being deleted, shutdown card
704 * This helps with administration at leaf nodes
705 * (You can tell if the person at the other end of the phone
706 * has an interface configured) and avoids DoS vulnerabilities
707 * in binary driver files - this fixes a problem with the current
708 * Sangoma driver going into strange states when all the network
709 * interfaces are deleted and the link irrecoverably disconnected.
710 */
711
712 if (!wandev->ndev && wandev->shutdown)
713 err = wandev->shutdown(wandev);
714
715 return err;
716 }
717
718 /*
719 * Miscellaneous Functions
720 */
721
722 /*
723 * Find WAN device by name.
724 * Return pointer to the WAN device data space or NULL if device not found.
725 */
726
727 static struct wan_device *wanrouter_find_device(char *name)
728 {
729 struct wan_device *wandev;
730
731 for (wandev = wanrouter_router_devlist;
732 wandev && strcmp(wandev->name, name);
733 wandev = wandev->next);
734 return wandev;
735 }
736
737 /*
738 * Delete WAN logical channel identified by its name.
739 * o find logical channel by its name
740 * o call driver's del_if() entry point
741 * o unregister network interface
742 * o unlink channel data space from linked list of channels
743 * o release channel data space
744 *
745 * Return: 0 success
746 * -ENODEV channel not found.
747 * -EBUSY interface is open
748 *
749 * Note: If (force != 0), then device will be destroyed even if interface
750 * associated with it is open. It's caller's responsibility to make
751 * sure that opened interfaces are not removed!
752 */
753
754 static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
755 {
756 struct net_device *dev = NULL, *prev = NULL;
757 unsigned long smp_flags=0;
758
759 lock_adapter_irq(&wandev->lock, &smp_flags);
760 dev = wandev->dev;
761 prev = NULL;
762 while (dev && strcmp(name, dev->name)) {
763 struct net_device **slave = dev->priv;
764 prev = dev;
765 dev = *slave;
766 }
767 unlock_adapter_irq(&wandev->lock, &smp_flags);
768
769 if (dev == NULL)
770 return -ENODEV; /* interface not found */
771
772 if (netif_running(dev))
773 return -EBUSY; /* interface in use */
774
775 if (wandev->del_if)
776 wandev->del_if(wandev, dev);
777
778 lock_adapter_irq(&wandev->lock, &smp_flags);
779 if (prev) {
780 struct net_device **prev_slave = prev->priv;
781 struct net_device **slave = dev->priv;
782
783 *prev_slave = *slave;
784 } else {
785 struct net_device **slave = dev->priv;
786 wandev->dev = *slave;
787 }
788 --wandev->ndev;
789 unlock_adapter_irq(&wandev->lock, &smp_flags);
790
791 printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
792
793 /* Due to new interface linking method using dev->priv,
794 * this code has moved from del_if() function.*/
795 kfree(dev->priv);
796 dev->priv=NULL;
797
798 unregister_netdev(dev);
799
800 free_netdev(dev);
801
802 return 0;
803 }
804
805 static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
806 {
807 spin_lock_irqsave(lock, *smp_flags);
808 }
809
810
811 static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
812 {
813 spin_unlock_irqrestore(lock, *smp_flags);
814 }
815
816 EXPORT_SYMBOL(register_wan_device);
817 EXPORT_SYMBOL(unregister_wan_device);
818
819 MODULE_LICENSE("GPL");
820
821 /*
822 * End
823 */
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