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Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6.23
[deliverable/linux.git] / net / wanrouter / wanmain.c
CommitLineData
1da177e4
LT		 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:
0779bf2d 6* o WAN device management (registering, unregistering)
1da177e4
LT		 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
1da177e4 45#include <linux/stddef.h> /* offsetof(), etc. */
4fc268d2 46#include <linux/capability.h>
1da177e4
LT		 47#include <linux/errno.h> /* return codes */
48#include <linux/kernel.h>
1da177e4 49#include <linux/module.h> /* support for loadable modules */
e49332bd
JJ		 50#include <linux/slab.h> /* kmalloc(), kfree() */
51#include <linux/mm.h>
1da177e4
LT		 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#include <net/syncppp.h>
61
62#define KMEM_SAFETYZONE 8
63
1da177e4
LT		 64/*
65 * Function Prototypes
66 */
67
68/*
69 * WAN device IOCTL handlers
70 */
71
72static int wanrouter_device_setup(struct wan_device *wandev,
73 wandev_conf_t __user *u_conf);
74static int wanrouter_device_stat(struct wan_device *wandev,
75 wandev_stat_t __user *u_stat);
76static int wanrouter_device_shutdown(struct wan_device *wandev);
77static int wanrouter_device_new_if(struct wan_device *wandev,
78 wanif_conf_t __user *u_conf);
79static int wanrouter_device_del_if(struct wan_device *wandev,
80 char __user *u_name);
81
82/*
83 * Miscellaneous
84 */
85
86static struct wan_device *wanrouter_find_device(char *name);
87static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
97353cb4
AB		 88static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
89static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
1da177e4
LT		 90
91
92
93/*
94 * Global Data
95 */
96
97static char wanrouter_fullname[] = "Sangoma WANPIPE Router";
98static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
99static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
100struct wan_device* wanrouter_router_devlist; /* list of registered devices */
101
102/*
103 * Organize Unique Identifiers for encapsulation/decapsulation
104 */
105
1da177e4 106#if 0
97353cb4 107static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
1da177e4
LT		 108static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
109#endif
110
111static int __init wanrouter_init(void)
112{
113 int err;
114
115 printk(KERN_INFO "%s v%u.%u %s\n",
116 wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
117 wanrouter_copyright);
118
119 err = wanrouter_proc_init();
120 if (err)
121 printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
122 wanrouter_modname);
123
124 return err;
125}
126
127static void __exit wanrouter_cleanup (void)
128{
129 wanrouter_proc_cleanup();
130}
131
132/*
133 * This is just plain dumb. We should move the bugger to drivers/net/wan,
134 * slap it first in directory and make it module_init(). The only reason
135 * for subsys_initcall() here is that net goes after drivers (why, BTW?)
136 */
137subsys_initcall(wanrouter_init);
138module_exit(wanrouter_cleanup);
139
140/*
141 * Kernel APIs
142 */
143
144/*
145 * Register WAN device.
146 * o verify device credentials
147 * o create an entry for the device in the /proc/net/router directory
148 * o initialize internally maintained fields of the wan_device structure
149 * o link device data space to a singly-linked list
150 * o if it's the first device, then start kernel 'thread'
151 * o increment module use count
152 *
153 * Return:
154 * 0 Ok
155 * < 0 error.
156 *
157 * Context: process
158 */
159
160
161int register_wan_device(struct wan_device *wandev)
162{
163 int err, namelen;
164
165 if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
166 (wandev->name == NULL))
167 return -EINVAL;
168
169 namelen = strlen(wandev->name);
170 if (!namelen || (namelen > WAN_DRVNAME_SZ))
171 return -EINVAL;
172
173 if (wanrouter_find_device(wandev->name))
174 return -EEXIST;
175
176#ifdef WANDEBUG
177 printk(KERN_INFO "%s: registering WAN device %s\n",
178 wanrouter_modname, wandev->name);
179#endif
180
181 /*
182 * Register /proc directory entry
183 */
184 err = wanrouter_proc_add(wandev);
185 if (err) {
186 printk(KERN_INFO
187 "%s: can't create /proc/net/router/%s entry!\n",
188 wanrouter_modname, wandev->name);
189 return err;
190 }
191
192 /*
193 * Initialize fields of the wan_device structure maintained by the
194 * router and update local data.
195 */
196
197 wandev->ndev = 0;
198 wandev->dev = NULL;
199 wandev->next = wanrouter_router_devlist;
200 wanrouter_router_devlist = wandev;
201 return 0;
202}
203
204/*
205 * Unregister WAN device.
206 * o shut down device
207 * o unlink device data space from the linked list
208 * o delete device entry in the /proc/net/router directory
209 * o decrement module use count
210 *
211 * Return: 0 Ok
212 * <0 error.
213 * Context: process
214 */
215
216
217int unregister_wan_device(char *name)
218{
219 struct wan_device *wandev, *prev;
220
221 if (name == NULL)
222 return -EINVAL;
223
224 for (wandev = wanrouter_router_devlist, prev = NULL;
225 wandev && strcmp(wandev->name, name);
226 prev = wandev, wandev = wandev->next)
227 ;
228 if (wandev == NULL)
229 return -ENODEV;
230
231#ifdef WANDEBUG
232 printk(KERN_INFO "%s: unregistering WAN device %s\n",
233 wanrouter_modname, name);
234#endif
235
236 if (wandev->state != WAN_UNCONFIGURED)
237 wanrouter_device_shutdown(wandev);
238
239 if (prev)
240 prev->next = wandev->next;
241 else
242 wanrouter_router_devlist = wandev->next;
243
244 wanrouter_proc_delete(wandev);
245 return 0;
246}
247
97353cb4
AB		 248#if 0
249
1da177e4
LT		 250/*
251 * Encapsulate packet.
252 *
253 * Return: encapsulation header size
254 * < 0 - unsupported Ethertype
255 *
256 * Notes:
257 * 1. This function may be called on interrupt context.
258 */
259
260
261int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
262 unsigned short type)
263{
264 int hdr_len = 0;
265
266 switch (type) {
267 case ETH_P_IP: /* IP datagram encapsulation */
268 hdr_len += 1;
269 skb_push(skb, 1);
270 skb->data[0] = NLPID_IP;
271 break;
272
273 case ETH_P_IPX: /* SNAP encapsulation */
274 case ETH_P_ARP:
275 hdr_len += 7;
276 skb_push(skb, 7);
277 skb->data[0] = 0;
278 skb->data[1] = NLPID_SNAP;
27d7ff46
ACM		 279 skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether,
280 sizeof(wanrouter_oui_ether));
1da177e4
LT		 281 *((unsigned short*)&skb->data[5]) = htons(type);
282 break;
283
284 default: /* Unknown packet type */
285 printk(KERN_INFO
286 "%s: unsupported Ethertype 0x%04X on interface %s!\n",
287 wanrouter_modname, type, dev->name);
288 hdr_len = -EINVAL;
289 }
290 return hdr_len;
291}
292
293
294/*
295 * Decapsulate packet.
296 *
297 * Return: Ethertype (in network order)
298 * 0 unknown encapsulation
299 *
300 * Notes:
301 * 1. This function may be called on interrupt context.
302 */
303
304
ab611487 305__be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
1da177e4
LT		 306{
307 int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
ab611487 308 __be16 ethertype;
1da177e4
LT		 309
310 switch (skb->data[cnt]) {
311 case NLPID_IP: /* IP datagramm */
312 ethertype = htons(ETH_P_IP);
313 cnt += 1;
314 break;
315
4ba6122b 316 case NLPID_SNAP: /* SNAP encapsulation */
1da177e4
LT		 317 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
318 sizeof(wanrouter_oui_ether))){
4ba6122b 319 printk(KERN_INFO
1da177e4
LT		 320 "%s: unsupported SNAP OUI %02X-%02X-%02X "
321 "on interface %s!\n", wanrouter_modname,
322 skb->data[cnt+1], skb->data[cnt+2],
323 skb->data[cnt+3], dev->name);
324 return 0;
325 }
ab611487 326 ethertype = *((__be16*)&skb->data[cnt+4]);
1da177e4
LT		 327 cnt += 6;
328 break;
329
330 /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
331
332 default:
333 printk(KERN_INFO
334 "%s: unsupported NLPID 0x%02X on interface %s!\n",
335 wanrouter_modname, skb->data[cnt], dev->name);
336 return 0;
337 }
338 skb->protocol = ethertype;
339 skb->pkt_type = PACKET_HOST; /* Physically point to point */
340 skb_pull(skb, cnt);
459a98ed 341 skb_reset_mac_header(skb);
1da177e4
LT		 342 return ethertype;
343}
344
97353cb4 345#endif /* 0 */
1da177e4
LT		 346
347/*
348 * WAN device IOCTL.
349 * o find WAN device associated with this node
350 * o execute requested action or pass command to the device driver
351 */
352
353int wanrouter_ioctl(struct inode *inode, struct file *file,
354 unsigned int cmd, unsigned long arg)
355{
356 int err = 0;
357 struct proc_dir_entry *dent;
358 struct wan_device *wandev;
359 void __user *data = (void __user *)arg;
360
361 if (!capable(CAP_NET_ADMIN))
362 return -EPERM;
363
364 if ((cmd >> 8) != ROUTER_IOCTL)
365 return -EINVAL;
366
367 dent = PDE(inode);
368 if ((dent == NULL) || (dent->data == NULL))
369 return -EINVAL;
370
371 wandev = dent->data;
372 if (wandev->magic != ROUTER_MAGIC)
373 return -EINVAL;
374
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 return err;
407}
408
409/*
410 * WAN Driver IOCTL Handlers
411 */
412
413/*
414 * Setup WAN link device.
415 * o verify user address space
416 * o allocate kernel memory and copy configuration data to kernel space
417 * o if configuration data includes extension, copy it to kernel space too
418 * o call driver's setup() entry point
419 */
420
421static int wanrouter_device_setup(struct wan_device *wandev,
422 wandev_conf_t __user *u_conf)
423{
424 void *data = NULL;
425 wandev_conf_t *conf;
426 int err = -EINVAL;
427
428 if (wandev->setup == NULL) { /* Nothing to do ? */
429 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
430 wandev->name);
431 return 0;
432 }
433
434 conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
435 if (conf == NULL){
436 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
437 wandev->name);
438 return -ENOBUFS;
439 }
440
441 if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
442 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
443 wandev->name);
444 kfree(conf);
445 return -EFAULT;
446 }
447
448 if (conf->magic != ROUTER_MAGIC) {
449 kfree(conf);
450 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
451 wandev->name);
4ba6122b 452 return -EINVAL;
1da177e4
LT		 453 }
454
455 if (conf->data_size && conf->data) {
75202e76 456 if (conf->data_size > 128000) {
1da177e4
LT		 457 printk(KERN_INFO
458 "%s: ERROR, Invalid firmware data size %i !\n",
459 wandev->name, conf->data_size);
460 kfree(conf);
4ba6122b 461 return -EINVAL;
1da177e4
LT		 462 }
463
464 data = vmalloc(conf->data_size);
465 if (!data) {
466 printk(KERN_INFO
4ba6122b 467 "%s: ERROR, Faild allocate kernel memory !\n",
1da177e4
LT		 468 wandev->name);
469 kfree(conf);
470 return -ENOBUFS;
471 }
472 if (!copy_from_user(data, conf->data, conf->data_size)) {
473 conf->data = data;
474 err = wandev->setup(wandev, conf);
475 } else {
476 printk(KERN_INFO
477 "%s: ERROR, Faild to copy from user data !\n",
478 wandev->name);
479 err = -EFAULT;
480 }
481 vfree(data);
482 } else {
483 printk(KERN_INFO
484 "%s: ERROR, No firmware found ! Firmware size = %i !\n",
485 wandev->name, conf->data_size);
486 }
487
488 kfree(conf);
489 return err;
490}
491
492/*
493 * Shutdown WAN device.
494 * o delete all not opened logical channels for this device
495 * o call driver's shutdown() entry point
496 */
497
498static int wanrouter_device_shutdown(struct wan_device *wandev)
499{
500 struct net_device *dev;
501 int err=0;
502
503 if (wandev->state == WAN_UNCONFIGURED)
504 return 0;
505
506 printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
507
508 for (dev = wandev->dev; dev;) {
509 err = wanrouter_delete_interface(wandev, dev->name);
510 if (err)
511 return err;
512 /* The above function deallocates the current dev
513 * structure. Therefore, we cannot use dev->priv
514 * as the next element: wandev->dev points to the
515 * next element */
516 dev = wandev->dev;
517 }
518
519 if (wandev->ndev)
520 return -EBUSY; /* there are opened interfaces */
521
522 if (wandev->shutdown)
523 err=wandev->shutdown(wandev);
524
525 return err;
526}
527
528/*
529 * Get WAN device status & statistics.
530 */
531
532static int wanrouter_device_stat(struct wan_device *wandev,
533 wandev_stat_t __user *u_stat)
534{
535 wandev_stat_t stat;
536
537 memset(&stat, 0, sizeof(stat));
538
539 /* Ask device driver to update device statistics */
540 if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
541 wandev->update(wandev);
542
543 /* Fill out structure */
544 stat.ndev = wandev->ndev;
545 stat.state = wandev->state;
546
547 if (copy_to_user(u_stat, &stat, sizeof(stat)))
548 return -EFAULT;
549
550 return 0;
551}
552
553/*
554 * Create new WAN interface.
555 * o verify user address space
556 * o copy configuration data to kernel address space
557 * o allocate network interface data space
558 * o call driver's new_if() entry point
559 * o make sure there is no interface name conflict
560 * o register network interface
561 */
562
563static int wanrouter_device_new_if(struct wan_device *wandev,
564 wanif_conf_t __user *u_conf)
565{
566 wanif_conf_t *cnf;
567 struct net_device *dev = NULL;
568#ifdef CONFIG_WANPIPE_MULTPPP
569 struct ppp_device *pppdev=NULL;
570#endif
571 int err;
572
573 if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
574 return -ENODEV;
575
576 cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
577 if (!cnf)
578 return -ENOBUFS;
579
580 err = -EFAULT;
581 if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
582 goto out;
583
584 err = -EINVAL;
585 if (cnf->magic != ROUTER_MAGIC)
586 goto out;
587
588 if (cnf->config_id == WANCONFIG_MPPP) {
589#ifdef CONFIG_WANPIPE_MULTPPP
0da974f4 590 pppdev = kzalloc(sizeof(struct ppp_device), GFP_KERNEL);
1da177e4
LT		 591 err = -ENOBUFS;
592 if (pppdev == NULL)
593 goto out;
0da974f4 594 pppdev->dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
1da177e4
LT		 595 if (pppdev->dev == NULL) {
596 kfree(pppdev);
597 err = -ENOBUFS;
598 goto out;
599 }
1da177e4
LT		 600 err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
601 dev = pppdev->dev;
602#else
603 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
604 wandev->name);
605 err = -EPROTONOSUPPORT;
606 goto out;
607#endif
608 } else {
0da974f4 609 dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
1da177e4
LT		 610 err = -ENOBUFS;
611 if (dev == NULL)
612 goto out;
1da177e4
LT		 613 err = wandev->new_if(wandev, dev, cnf);
614 }
615
616 if (!err) {
617 /* Register network interface. This will invoke init()
618 * function supplied by the driver. If device registered
619 * successfully, add it to the interface list.
620 */
621
622 if (dev->name == NULL) {
623 err = -EINVAL;
624 } else {
625
626 #ifdef WANDEBUG
627 printk(KERN_INFO "%s: registering interface %s...\n",
628 wanrouter_modname, dev->name);
629 #endif
630
631 err = register_netdev(dev);
632 if (!err) {
633 struct net_device *slave = NULL;
634 unsigned long smp_flags=0;
635
636 lock_adapter_irq(&wandev->lock, &smp_flags);
637
638 if (wandev->dev == NULL) {
639 wandev->dev = dev;
640 } else {
641 for (slave=wandev->dev;
642 *((struct net_device **)slave->priv);
643 slave = *((struct net_device **)slave->priv));
644
645 *((struct net_device **)slave->priv) = dev;
646 }
647 ++wandev->ndev;
648
649 unlock_adapter_irq(&wandev->lock, &smp_flags);
650 err = 0; /* done !!! */
651 goto out;
652 }
653 }
654 if (wandev->del_if)
655 wandev->del_if(wandev, dev);
656 }
657
658 /* This code has moved from del_if() function */
a51482bd
JJ		 659 kfree(dev->priv);
660 dev->priv = NULL;
1da177e4
LT		 661
662#ifdef CONFIG_WANPIPE_MULTPPP
663 if (cnf->config_id == WANCONFIG_MPPP)
664 kfree(pppdev);
665 else
666 kfree(dev);
667#else
668 /* Sync PPP is disabled */
669 if (cnf->config_id != WANCONFIG_MPPP)
670 kfree(dev);
671#endif
672
673out:
674 kfree(cnf);
675 return err;
676}
677
678
679/*
680 * Delete WAN logical channel.
681 * o verify user address space
682 * o copy configuration data to kernel address space
683 */
684
685static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
686{
687 char name[WAN_IFNAME_SZ + 1];
4ba6122b 688 int err = 0;
1da177e4
LT		 689
690 if (wandev->state == WAN_UNCONFIGURED)
691 return -ENODEV;
692
693 memset(name, 0, sizeof(name));
694
695 if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
696 return -EFAULT;
697
698 err = wanrouter_delete_interface(wandev, name);
699 if (err)
700 return err;
701
702 /* If last interface being deleted, shutdown card
703 * This helps with administration at leaf nodes
704 * (You can tell if the person at the other end of the phone
705 * has an interface configured) and avoids DoS vulnerabilities
706 * in binary driver files - this fixes a problem with the current
707 * Sangoma driver going into strange states when all the network
708 * interfaces are deleted and the link irrecoverably disconnected.
709 */
710
4ba6122b
YH		 711 if (!wandev->ndev && wandev->shutdown)
712 err = wandev->shutdown(wandev);
1da177e4
LT		 713
714 return err;
715}
716
717/*
718 * Miscellaneous Functions
719 */
720
721/*
722 * Find WAN device by name.
723 * Return pointer to the WAN device data space or NULL if device not found.
724 */
725
726static struct wan_device *wanrouter_find_device(char *name)
727{
728 struct wan_device *wandev;
729
730 for (wandev = wanrouter_router_devlist;
731 wandev && strcmp(wandev->name, name);
732 wandev = wandev->next);
733 return wandev;
734}
735
736/*
737 * Delete WAN logical channel identified by its name.
738 * o find logical channel by its name
739 * o call driver's del_if() entry point
740 * o unregister network interface
741 * o unlink channel data space from linked list of channels
742 * o release channel data space
743 *
744 * Return: 0 success
745 * -ENODEV channel not found.
746 * -EBUSY interface is open
747 *
748 * Note: If (force != 0), then device will be destroyed even if interface
749 * associated with it is open. It's caller's responsibility to make
750 * sure that opened interfaces are not removed!
751 */
752
753static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
754{
755 struct net_device *dev = NULL, *prev = NULL;
756 unsigned long smp_flags=0;
757
758 lock_adapter_irq(&wandev->lock, &smp_flags);
759 dev = wandev->dev;
760 prev = NULL;
761 while (dev && strcmp(name, dev->name)) {
762 struct net_device **slave = dev->priv;
763 prev = dev;
764 dev = *slave;
765 }
766 unlock_adapter_irq(&wandev->lock, &smp_flags);
767
768 if (dev == NULL)
769 return -ENODEV; /* interface not found */
770
771 if (netif_running(dev))
772 return -EBUSY; /* interface in use */
773
774 if (wandev->del_if)
775 wandev->del_if(wandev, dev);
776
777 lock_adapter_irq(&wandev->lock, &smp_flags);
778 if (prev) {
779 struct net_device **prev_slave = prev->priv;
780 struct net_device **slave = dev->priv;
781
782 *prev_slave = *slave;
783 } else {
784 struct net_device **slave = dev->priv;
785 wandev->dev = *slave;
786 }
787 --wandev->ndev;
788 unlock_adapter_irq(&wandev->lock, &smp_flags);
789
790 printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
791
792 /* Due to new interface linking method using dev->priv,
793 * this code has moved from del_if() function.*/
a51482bd
JJ		 794 kfree(dev->priv);
795 dev->priv=NULL;
1da177e4
LT		 796
797 unregister_netdev(dev);
798
799 free_netdev(dev);
800
801 return 0;
802}
803
97353cb4 804static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
1da177e4 805{
4ba6122b 806 spin_lock_irqsave(lock, *smp_flags);
1da177e4
LT		 807}
808
809
97353cb4 810static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
1da177e4
LT		 811{
812 spin_unlock_irqrestore(lock, *smp_flags);
813}
814
815EXPORT_SYMBOL(register_wan_device);
816EXPORT_SYMBOL(unregister_wan_device);
1da177e4
LT		 817
818MODULE_LICENSE("GPL");
819
820/*
821 * End
822 */
Linux kernel - Deliverables
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