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[deliverable/linux.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 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
90 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 static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
108 #if 0
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 /*
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 memcpy(&skb->data[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->mac.raw = skb->data;
341 return ethertype;
342 }
343
344
345 /*
346 * WAN device IOCTL.
347 * o find WAN device associated with this node
348 * o execute requested action or pass command to the device driver
349 */
350
351 int wanrouter_ioctl(struct inode *inode, struct file *file,
352 unsigned int cmd, unsigned long arg)
353 {
354 int err = 0;
355 struct proc_dir_entry *dent;
356 struct wan_device *wandev;
357 void __user *data = (void __user *)arg;
358
359 if (!capable(CAP_NET_ADMIN))
360 return -EPERM;
361
362 if ((cmd >> 8) != ROUTER_IOCTL)
363 return -EINVAL;
364
365 dent = PDE(inode);
366 if ((dent == NULL) || (dent->data == NULL))
367 return -EINVAL;
368
369 wandev = dent->data;
370 if (wandev->magic != ROUTER_MAGIC)
371 return -EINVAL;
372
373 switch (cmd) {
374 case ROUTER_SETUP:
375 err = wanrouter_device_setup(wandev, data);
376 break;
377
378 case ROUTER_DOWN:
379 err = wanrouter_device_shutdown(wandev);
380 break;
381
382 case ROUTER_STAT:
383 err = wanrouter_device_stat(wandev, data);
384 break;
385
386 case ROUTER_IFNEW:
387 err = wanrouter_device_new_if(wandev, data);
388 break;
389
390 case ROUTER_IFDEL:
391 err = wanrouter_device_del_if(wandev, data);
392 break;
393
394 case ROUTER_IFSTAT:
395 break;
396
397 default:
398 if ((cmd >= ROUTER_USER) &&
399 (cmd <= ROUTER_USER_MAX) &&
400 wandev->ioctl)
401 err = wandev->ioctl(wandev, cmd, arg);
402 else err = -EINVAL;
403 }
404 return err;
405 }
406
407 /*
408 * WAN Driver IOCTL Handlers
409 */
410
411 /*
412 * Setup WAN link device.
413 * o verify user address space
414 * o allocate kernel memory and copy configuration data to kernel space
415 * o if configuration data includes extension, copy it to kernel space too
416 * o call driver's setup() entry point
417 */
418
419 static int wanrouter_device_setup(struct wan_device *wandev,
420 wandev_conf_t __user *u_conf)
421 {
422 void *data = NULL;
423 wandev_conf_t *conf;
424 int err = -EINVAL;
425
426 if (wandev->setup == NULL) { /* Nothing to do ? */
427 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
428 wandev->name);
429 return 0;
430 }
431
432 conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
433 if (conf == NULL){
434 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
435 wandev->name);
436 return -ENOBUFS;
437 }
438
439 if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
440 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
441 wandev->name);
442 kfree(conf);
443 return -EFAULT;
444 }
445
446 if (conf->magic != ROUTER_MAGIC) {
447 kfree(conf);
448 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
449 wandev->name);
450 return -EINVAL;
451 }
452
453 if (conf->data_size && conf->data) {
454 if (conf->data_size > 128000 || conf->data_size < 0) {
455 printk(KERN_INFO
456 "%s: ERROR, Invalid firmware data size %i !\n",
457 wandev->name, conf->data_size);
458 kfree(conf);
459 return -EINVAL;
460 }
461
462 data = vmalloc(conf->data_size);
463 if (!data) {
464 printk(KERN_INFO
465 "%s: ERROR, Faild allocate kernel memory !\n",
466 wandev->name);
467 kfree(conf);
468 return -ENOBUFS;
469 }
470 if (!copy_from_user(data, conf->data, conf->data_size)) {
471 conf->data = data;
472 err = wandev->setup(wandev, conf);
473 } else {
474 printk(KERN_INFO
475 "%s: ERROR, Faild to copy from user data !\n",
476 wandev->name);
477 err = -EFAULT;
478 }
479 vfree(data);
480 } else {
481 printk(KERN_INFO
482 "%s: ERROR, No firmware found ! Firmware size = %i !\n",
483 wandev->name, conf->data_size);
484 }
485
486 kfree(conf);
487 return err;
488 }
489
490 /*
491 * Shutdown WAN device.
492 * o delete all not opened logical channels for this device
493 * o call driver's shutdown() entry point
494 */
495
496 static int wanrouter_device_shutdown(struct wan_device *wandev)
497 {
498 struct net_device *dev;
499 int err=0;
500
501 if (wandev->state == WAN_UNCONFIGURED)
502 return 0;
503
504 printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
505
506 for (dev = wandev->dev; dev;) {
507 err = wanrouter_delete_interface(wandev, dev->name);
508 if (err)
509 return err;
510 /* The above function deallocates the current dev
511 * structure. Therefore, we cannot use dev->priv
512 * as the next element: wandev->dev points to the
513 * next element */
514 dev = wandev->dev;
515 }
516
517 if (wandev->ndev)
518 return -EBUSY; /* there are opened interfaces */
519
520 if (wandev->shutdown)
521 err=wandev->shutdown(wandev);
522
523 return err;
524 }
525
526 /*
527 * Get WAN device status & statistics.
528 */
529
530 static int wanrouter_device_stat(struct wan_device *wandev,
531 wandev_stat_t __user *u_stat)
532 {
533 wandev_stat_t stat;
534
535 memset(&stat, 0, sizeof(stat));
536
537 /* Ask device driver to update device statistics */
538 if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
539 wandev->update(wandev);
540
541 /* Fill out structure */
542 stat.ndev = wandev->ndev;
543 stat.state = wandev->state;
544
545 if (copy_to_user(u_stat, &stat, sizeof(stat)))
546 return -EFAULT;
547
548 return 0;
549 }
550
551 /*
552 * Create new WAN interface.
553 * o verify user address space
554 * o copy configuration data to kernel address space
555 * o allocate network interface data space
556 * o call driver's new_if() entry point
557 * o make sure there is no interface name conflict
558 * o register network interface
559 */
560
561 static int wanrouter_device_new_if(struct wan_device *wandev,
562 wanif_conf_t __user *u_conf)
563 {
564 wanif_conf_t *cnf;
565 struct net_device *dev = NULL;
566 #ifdef CONFIG_WANPIPE_MULTPPP
567 struct ppp_device *pppdev=NULL;
568 #endif
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 #ifdef CONFIG_WANPIPE_MULTPPP
588 pppdev = kzalloc(sizeof(struct ppp_device), GFP_KERNEL);
589 err = -ENOBUFS;
590 if (pppdev == NULL)
591 goto out;
592 pppdev->dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
593 if (pppdev->dev == NULL) {
594 kfree(pppdev);
595 err = -ENOBUFS;
596 goto out;
597 }
598 err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
599 dev = pppdev->dev;
600 #else
601 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
602 wandev->name);
603 err = -EPROTONOSUPPORT;
604 goto out;
605 #endif
606 } else {
607 dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
608 err = -ENOBUFS;
609 if (dev == NULL)
610 goto out;
611 err = wandev->new_if(wandev, dev, cnf);
612 }
613
614 if (!err) {
615 /* Register network interface. This will invoke init()
616 * function supplied by the driver. If device registered
617 * successfully, add it to the interface list.
618 */
619
620 if (dev->name == NULL) {
621 err = -EINVAL;
622 } else {
623
624 #ifdef WANDEBUG
625 printk(KERN_INFO "%s: registering interface %s...\n",
626 wanrouter_modname, dev->name);
627 #endif
628
629 err = register_netdev(dev);
630 if (!err) {
631 struct net_device *slave = NULL;
632 unsigned long smp_flags=0;
633
634 lock_adapter_irq(&wandev->lock, &smp_flags);
635
636 if (wandev->dev == NULL) {
637 wandev->dev = dev;
638 } else {
639 for (slave=wandev->dev;
640 *((struct net_device **)slave->priv);
641 slave = *((struct net_device **)slave->priv));
642
643 *((struct net_device **)slave->priv) = dev;
644 }
645 ++wandev->ndev;
646
647 unlock_adapter_irq(&wandev->lock, &smp_flags);
648 err = 0; /* done !!! */
649 goto out;
650 }
651 }
652 if (wandev->del_if)
653 wandev->del_if(wandev, dev);
654 }
655
656 /* This code has moved from del_if() function */
657 kfree(dev->priv);
658 dev->priv = NULL;
659
660 #ifdef CONFIG_WANPIPE_MULTPPP
661 if (cnf->config_id == WANCONFIG_MPPP)
662 kfree(pppdev);
663 else
664 kfree(dev);
665 #else
666 /* Sync PPP is disabled */
667 if (cnf->config_id != WANCONFIG_MPPP)
668 kfree(dev);
669 #endif
670
671 out:
672 kfree(cnf);
673 return err;
674 }
675
676
677 /*
678 * Delete WAN logical channel.
679 * o verify user address space
680 * o copy configuration data to kernel address space
681 */
682
683 static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
684 {
685 char name[WAN_IFNAME_SZ + 1];
686 int err = 0;
687
688 if (wandev->state == WAN_UNCONFIGURED)
689 return -ENODEV;
690
691 memset(name, 0, sizeof(name));
692
693 if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
694 return -EFAULT;
695
696 err = wanrouter_delete_interface(wandev, name);
697 if (err)
698 return err;
699
700 /* If last interface being deleted, shutdown card
701 * This helps with administration at leaf nodes
702 * (You can tell if the person at the other end of the phone
703 * has an interface configured) and avoids DoS vulnerabilities
704 * in binary driver files - this fixes a problem with the current
705 * Sangoma driver going into strange states when all the network
706 * interfaces are deleted and the link irrecoverably disconnected.
707 */
708
709 if (!wandev->ndev && wandev->shutdown)
710 err = wandev->shutdown(wandev);
711
712 return err;
713 }
714
715 /*
716 * Miscellaneous Functions
717 */
718
719 /*
720 * Find WAN device by name.
721 * Return pointer to the WAN device data space or NULL if device not found.
722 */
723
724 static struct wan_device *wanrouter_find_device(char *name)
725 {
726 struct wan_device *wandev;
727
728 for (wandev = wanrouter_router_devlist;
729 wandev && strcmp(wandev->name, name);
730 wandev = wandev->next);
731 return wandev;
732 }
733
734 /*
735 * Delete WAN logical channel identified by its name.
736 * o find logical channel by its name
737 * o call driver's del_if() entry point
738 * o unregister network interface
739 * o unlink channel data space from linked list of channels
740 * o release channel data space
741 *
742 * Return: 0 success
743 * -ENODEV channel not found.
744 * -EBUSY interface is open
745 *
746 * Note: If (force != 0), then device will be destroyed even if interface
747 * associated with it is open. It's caller's responsibility to make
748 * sure that opened interfaces are not removed!
749 */
750
751 static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
752 {
753 struct net_device *dev = NULL, *prev = NULL;
754 unsigned long smp_flags=0;
755
756 lock_adapter_irq(&wandev->lock, &smp_flags);
757 dev = wandev->dev;
758 prev = NULL;
759 while (dev && strcmp(name, dev->name)) {
760 struct net_device **slave = dev->priv;
761 prev = dev;
762 dev = *slave;
763 }
764 unlock_adapter_irq(&wandev->lock, &smp_flags);
765
766 if (dev == NULL)
767 return -ENODEV; /* interface not found */
768
769 if (netif_running(dev))
770 return -EBUSY; /* interface in use */
771
772 if (wandev->del_if)
773 wandev->del_if(wandev, dev);
774
775 lock_adapter_irq(&wandev->lock, &smp_flags);
776 if (prev) {
777 struct net_device **prev_slave = prev->priv;
778 struct net_device **slave = dev->priv;
779
780 *prev_slave = *slave;
781 } else {
782 struct net_device **slave = dev->priv;
783 wandev->dev = *slave;
784 }
785 --wandev->ndev;
786 unlock_adapter_irq(&wandev->lock, &smp_flags);
787
788 printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
789
790 /* Due to new interface linking method using dev->priv,
791 * this code has moved from del_if() function.*/
792 kfree(dev->priv);
793 dev->priv=NULL;
794
795 unregister_netdev(dev);
796
797 free_netdev(dev);
798
799 return 0;
800 }
801
802 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
803 {
804 spin_lock_irqsave(lock, *smp_flags);
805 }
806
807
808 void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
809 {
810 spin_unlock_irqrestore(lock, *smp_flags);
811 }
812
813 EXPORT_SYMBOL(register_wan_device);
814 EXPORT_SYMBOL(unregister_wan_device);
815 EXPORT_SYMBOL(wanrouter_encapsulate);
816 EXPORT_SYMBOL(wanrouter_type_trans);
817 EXPORT_SYMBOL(lock_adapter_irq);
818 EXPORT_SYMBOL(unlock_adapter_irq);
819
820 MODULE_LICENSE("GPL");
821
822 /*
823 * End
824 */
Linux kernel - Deliverables
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