blob: b210a88d09608f5d776bf4e5196fcfe71adf7ad0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*****************************************************************************
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:
Matt LaPlante0779bf22006-11-30 05:24:39 +01006* o WAN device management (registering, unregistering)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/stddef.h> /* offsetof(), etc. */
Randy Dunlap4fc268d2006-01-11 12:17:47 -080046#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/errno.h> /* return codes */
48#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/module.h> /* support for loadable modules */
Jesper Juhle49332b2005-05-01 08:59:08 -070050#include <linux/slab.h> /* kmalloc(), kfree() */
51#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070064/*
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);
Adrian Bunk97353cb2007-02-05 18:07:27 -080088static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
89static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106#if 0
Adrian Bunk97353cb2007-02-05 18:07:27 -0800107static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static 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
Adrian Bunk97353cb2007-02-05 18:07:27 -0800248#if 0
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250/*
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;
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300279 skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether,
280 sizeof(wanrouter_oui_ether));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 *((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
Alexey Dobriyanab611482005-07-12 12:08:43 -0700305__be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
307 int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
Alexey Dobriyanab611482005-07-12 12:08:43 -0700308 __be16 ethertype;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 switch (skb->data[cnt]) {
311 case NLPID_IP: /* IP datagramm */
312 ethertype = htons(ETH_P_IP);
313 cnt += 1;
314 break;
315
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900316 case NLPID_SNAP: /* SNAP encapsulation */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
318 sizeof(wanrouter_oui_ether))){
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900319 printk(KERN_INFO
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 "%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 }
Alexey Dobriyanab611482005-07-12 12:08:43 -0700326 ethertype = *((__be16*)&skb->data[cnt+4]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 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);
Arnaldo Carvalho de Melo459a98e2007-03-19 15:30:44 -0700341 skb_reset_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 return ethertype;
343}
344
Adrian Bunk97353cb2007-02-05 18:07:27 -0800345#endif /* 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
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
Alan Cox866988e2008-05-25 23:41:40 -0700353long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
Alan Cox866988e2008-05-25 23:41:40 -0700355 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 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
Alan Cox866988e2008-05-25 23:41:40 -0700375 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 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 }
Alan Cox866988e2008-05-25 23:41:40 -0700407 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return err;
409}
410
411/*
412 * WAN Driver IOCTL Handlers
413 */
414
415/*
416 * Setup WAN link device.
417 * o verify user address space
418 * o allocate kernel memory and copy configuration data to kernel space
419 * o if configuration data includes extension, copy it to kernel space too
420 * o call driver's setup() entry point
421 */
422
423static int wanrouter_device_setup(struct wan_device *wandev,
424 wandev_conf_t __user *u_conf)
425{
426 void *data = NULL;
427 wandev_conf_t *conf;
428 int err = -EINVAL;
429
430 if (wandev->setup == NULL) { /* Nothing to do ? */
431 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
432 wandev->name);
433 return 0;
434 }
435
436 conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
437 if (conf == NULL){
438 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
439 wandev->name);
440 return -ENOBUFS;
441 }
442
443 if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
444 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
445 wandev->name);
446 kfree(conf);
447 return -EFAULT;
448 }
449
450 if (conf->magic != ROUTER_MAGIC) {
451 kfree(conf);
452 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
453 wandev->name);
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900454 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 }
456
457 if (conf->data_size && conf->data) {
Bill Nottingham75202e72007-05-31 21:33:35 -0700458 if (conf->data_size > 128000) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 printk(KERN_INFO
460 "%s: ERROR, Invalid firmware data size %i !\n",
461 wandev->name, conf->data_size);
462 kfree(conf);
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900463 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 }
465
466 data = vmalloc(conf->data_size);
467 if (!data) {
468 printk(KERN_INFO
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900469 "%s: ERROR, Faild allocate kernel memory !\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 wandev->name);
471 kfree(conf);
472 return -ENOBUFS;
473 }
474 if (!copy_from_user(data, conf->data, conf->data_size)) {
475 conf->data = data;
476 err = wandev->setup(wandev, conf);
477 } else {
478 printk(KERN_INFO
479 "%s: ERROR, Faild to copy from user data !\n",
480 wandev->name);
481 err = -EFAULT;
482 }
483 vfree(data);
484 } else {
485 printk(KERN_INFO
486 "%s: ERROR, No firmware found ! Firmware size = %i !\n",
487 wandev->name, conf->data_size);
488 }
489
490 kfree(conf);
491 return err;
492}
493
494/*
495 * Shutdown WAN device.
496 * o delete all not opened logical channels for this device
497 * o call driver's shutdown() entry point
498 */
499
500static int wanrouter_device_shutdown(struct wan_device *wandev)
501{
502 struct net_device *dev;
503 int err=0;
504
505 if (wandev->state == WAN_UNCONFIGURED)
506 return 0;
507
508 printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
509
510 for (dev = wandev->dev; dev;) {
511 err = wanrouter_delete_interface(wandev, dev->name);
512 if (err)
513 return err;
514 /* The above function deallocates the current dev
515 * structure. Therefore, we cannot use dev->priv
516 * as the next element: wandev->dev points to the
517 * next element */
518 dev = wandev->dev;
519 }
520
521 if (wandev->ndev)
522 return -EBUSY; /* there are opened interfaces */
523
524 if (wandev->shutdown)
525 err=wandev->shutdown(wandev);
526
527 return err;
528}
529
530/*
531 * Get WAN device status & statistics.
532 */
533
534static int wanrouter_device_stat(struct wan_device *wandev,
535 wandev_stat_t __user *u_stat)
536{
537 wandev_stat_t stat;
538
539 memset(&stat, 0, sizeof(stat));
540
541 /* Ask device driver to update device statistics */
542 if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
543 wandev->update(wandev);
544
545 /* Fill out structure */
546 stat.ndev = wandev->ndev;
547 stat.state = wandev->state;
548
549 if (copy_to_user(u_stat, &stat, sizeof(stat)))
550 return -EFAULT;
551
552 return 0;
553}
554
555/*
556 * Create new WAN interface.
557 * o verify user address space
558 * o copy configuration data to kernel address space
559 * o allocate network interface data space
560 * o call driver's new_if() entry point
561 * o make sure there is no interface name conflict
562 * o register network interface
563 */
564
565static int wanrouter_device_new_if(struct wan_device *wandev,
566 wanif_conf_t __user *u_conf)
567{
568 wanif_conf_t *cnf;
569 struct net_device *dev = NULL;
570#ifdef CONFIG_WANPIPE_MULTPPP
571 struct ppp_device *pppdev=NULL;
572#endif
573 int err;
574
575 if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
576 return -ENODEV;
577
578 cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
579 if (!cnf)
580 return -ENOBUFS;
581
582 err = -EFAULT;
583 if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
584 goto out;
585
586 err = -EINVAL;
587 if (cnf->magic != ROUTER_MAGIC)
588 goto out;
589
590 if (cnf->config_id == WANCONFIG_MPPP) {
591#ifdef CONFIG_WANPIPE_MULTPPP
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700592 pppdev = kzalloc(sizeof(struct ppp_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 err = -ENOBUFS;
594 if (pppdev == NULL)
595 goto out;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700596 pppdev->dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 if (pppdev->dev == NULL) {
598 kfree(pppdev);
599 err = -ENOBUFS;
600 goto out;
601 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
603 dev = pppdev->dev;
604#else
605 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
606 wandev->name);
607 err = -EPROTONOSUPPORT;
608 goto out;
609#endif
610 } else {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700611 dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 err = -ENOBUFS;
613 if (dev == NULL)
614 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 err = wandev->new_if(wandev, dev, cnf);
616 }
617
618 if (!err) {
619 /* Register network interface. This will invoke init()
620 * function supplied by the driver. If device registered
621 * successfully, add it to the interface list.
622 */
623
624 if (dev->name == NULL) {
625 err = -EINVAL;
626 } else {
627
628 #ifdef WANDEBUG
629 printk(KERN_INFO "%s: registering interface %s...\n",
630 wanrouter_modname, dev->name);
631 #endif
632
633 err = register_netdev(dev);
634 if (!err) {
635 struct net_device *slave = NULL;
636 unsigned long smp_flags=0;
637
638 lock_adapter_irq(&wandev->lock, &smp_flags);
639
640 if (wandev->dev == NULL) {
641 wandev->dev = dev;
642 } else {
643 for (slave=wandev->dev;
644 *((struct net_device **)slave->priv);
645 slave = *((struct net_device **)slave->priv));
646
647 *((struct net_device **)slave->priv) = dev;
648 }
649 ++wandev->ndev;
650
651 unlock_adapter_irq(&wandev->lock, &smp_flags);
652 err = 0; /* done !!! */
653 goto out;
654 }
655 }
656 if (wandev->del_if)
657 wandev->del_if(wandev, dev);
658 }
659
660 /* This code has moved from del_if() function */
Jesper Juhla51482b2005-11-08 09:41:34 -0800661 kfree(dev->priv);
662 dev->priv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
664#ifdef CONFIG_WANPIPE_MULTPPP
665 if (cnf->config_id == WANCONFIG_MPPP)
666 kfree(pppdev);
667 else
668 kfree(dev);
669#else
670 /* Sync PPP is disabled */
671 if (cnf->config_id != WANCONFIG_MPPP)
672 kfree(dev);
673#endif
674
675out:
676 kfree(cnf);
677 return err;
678}
679
680
681/*
682 * Delete WAN logical channel.
683 * o verify user address space
684 * o copy configuration data to kernel address space
685 */
686
687static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
688{
689 char name[WAN_IFNAME_SZ + 1];
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900690 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692 if (wandev->state == WAN_UNCONFIGURED)
693 return -ENODEV;
694
695 memset(name, 0, sizeof(name));
696
697 if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
698 return -EFAULT;
699
700 err = wanrouter_delete_interface(wandev, name);
701 if (err)
702 return err;
703
704 /* If last interface being deleted, shutdown card
705 * This helps with administration at leaf nodes
706 * (You can tell if the person at the other end of the phone
707 * has an interface configured) and avoids DoS vulnerabilities
708 * in binary driver files - this fixes a problem with the current
709 * Sangoma driver going into strange states when all the network
710 * interfaces are deleted and the link irrecoverably disconnected.
711 */
712
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900713 if (!wandev->ndev && wandev->shutdown)
714 err = wandev->shutdown(wandev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
716 return err;
717}
718
719/*
720 * Miscellaneous Functions
721 */
722
723/*
724 * Find WAN device by name.
725 * Return pointer to the WAN device data space or NULL if device not found.
726 */
727
728static struct wan_device *wanrouter_find_device(char *name)
729{
730 struct wan_device *wandev;
731
732 for (wandev = wanrouter_router_devlist;
733 wandev && strcmp(wandev->name, name);
734 wandev = wandev->next);
735 return wandev;
736}
737
738/*
739 * Delete WAN logical channel identified by its name.
740 * o find logical channel by its name
741 * o call driver's del_if() entry point
742 * o unregister network interface
743 * o unlink channel data space from linked list of channels
744 * o release channel data space
745 *
746 * Return: 0 success
747 * -ENODEV channel not found.
748 * -EBUSY interface is open
749 *
750 * Note: If (force != 0), then device will be destroyed even if interface
751 * associated with it is open. It's caller's responsibility to make
752 * sure that opened interfaces are not removed!
753 */
754
755static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
756{
757 struct net_device *dev = NULL, *prev = NULL;
758 unsigned long smp_flags=0;
759
760 lock_adapter_irq(&wandev->lock, &smp_flags);
761 dev = wandev->dev;
762 prev = NULL;
763 while (dev && strcmp(name, dev->name)) {
764 struct net_device **slave = dev->priv;
765 prev = dev;
766 dev = *slave;
767 }
768 unlock_adapter_irq(&wandev->lock, &smp_flags);
769
770 if (dev == NULL)
771 return -ENODEV; /* interface not found */
772
773 if (netif_running(dev))
774 return -EBUSY; /* interface in use */
775
776 if (wandev->del_if)
777 wandev->del_if(wandev, dev);
778
779 lock_adapter_irq(&wandev->lock, &smp_flags);
780 if (prev) {
781 struct net_device **prev_slave = prev->priv;
782 struct net_device **slave = dev->priv;
783
784 *prev_slave = *slave;
785 } else {
786 struct net_device **slave = dev->priv;
787 wandev->dev = *slave;
788 }
789 --wandev->ndev;
790 unlock_adapter_irq(&wandev->lock, &smp_flags);
791
792 printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
793
794 /* Due to new interface linking method using dev->priv,
795 * this code has moved from del_if() function.*/
Jesper Juhla51482b2005-11-08 09:41:34 -0800796 kfree(dev->priv);
797 dev->priv=NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
799 unregister_netdev(dev);
800
801 free_netdev(dev);
802
803 return 0;
804}
805
Adrian Bunk97353cb2007-02-05 18:07:27 -0800806static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807{
YOSHIFUJI Hideaki4ba61222007-02-09 23:25:25 +0900808 spin_lock_irqsave(lock, *smp_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809}
810
811
Adrian Bunk97353cb2007-02-05 18:07:27 -0800812static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
814 spin_unlock_irqrestore(lock, *smp_flags);
815}
816
817EXPORT_SYMBOL(register_wan_device);
818EXPORT_SYMBOL(unregister_wan_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820MODULE_LICENSE("GPL");
821
822/*
823 * End
824 */