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[PATCH] fuse: extend semantics of connected flag
[GitHub/LineageOS/android_kernel_samsung_universal7580.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 managenment (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/config.h>
46 #include <linux/stddef.h> /* offsetof(), etc. */
47 #include <linux/capability.h>
48 #include <linux/errno.h> /* return codes */
49 #include <linux/kernel.h>
50 #include <linux/init.h>
51 #include <linux/module.h> /* support for loadable modules */
52 #include <linux/slab.h> /* kmalloc(), kfree() */
53 #include <linux/mm.h>
54 #include <linux/string.h> /* inline mem*, str* functions */
55
56 #include <asm/byteorder.h> /* htons(), etc. */
57 #include <linux/wanrouter.h> /* WAN router API definitions */
58
59 #include <linux/vmalloc.h> /* vmalloc, vfree */
60 #include <asm/uaccess.h> /* copy_to/from_user */
61 #include <linux/init.h> /* __initfunc et al. */
62 #include <net/syncppp.h>
63
64 #define KMEM_SAFETYZONE 8
65
66 /***********FOR DEBUGGING PURPOSES*********************************************
67 static void * dbg_kmalloc(unsigned int size, int prio, int line) {
68 int i = 0;
69 void * v = kmalloc(size+sizeof(unsigned int)+2*KMEM_SAFETYZONE*8,prio);
70 char * c1 = v;
71 c1 += sizeof(unsigned int);
72 *((unsigned int *)v) = size;
73
74 for (i = 0; i < KMEM_SAFETYZONE; i++) {
75 c1[0] = 'D'; c1[1] = 'E'; c1[2] = 'A'; c1[3] = 'D';
76 c1[4] = 'B'; c1[5] = 'E'; c1[6] = 'E'; c1[7] = 'F';
77 c1 += 8;
78 }
79 c1 += size;
80 for (i = 0; i < KMEM_SAFETYZONE; i++) {
81 c1[0] = 'M'; c1[1] = 'U'; c1[2] = 'N'; c1[3] = 'G';
82 c1[4] = 'W'; c1[5] = 'A'; c1[6] = 'L'; c1[7] = 'L';
83 c1 += 8;
84 }
85 v = ((char *)v) + sizeof(unsigned int) + KMEM_SAFETYZONE*8;
86 printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v);
87 return v;
88 }
89 static void dbg_kfree(void * v, int line) {
90 unsigned int * sp = (unsigned int *)(((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8));
91 unsigned int size = *sp;
92 char * c1 = ((char *)v) - KMEM_SAFETYZONE*8;
93 int i = 0;
94 for (i = 0; i < KMEM_SAFETYZONE; i++) {
95 if ( c1[0] != 'D' || c1[1] != 'E' || c1[2] != 'A' || c1[3] != 'D'
96 || c1[4] != 'B' || c1[5] != 'E' || c1[6] != 'E' || c1[7] != 'F') {
97 printk(KERN_INFO "kmalloced block at %p has been corrupted (underrun)!\n",v);
98 printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
99 c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
100 }
101 c1 += 8;
102 }
103 c1 += size;
104 for (i = 0; i < KMEM_SAFETYZONE; i++) {
105 if ( c1[0] != 'M' || c1[1] != 'U' || c1[2] != 'N' || c1[3] != 'G'
106 || c1[4] != 'W' || c1[5] != 'A' || c1[6] != 'L' || c1[7] != 'L'
107 ) {
108 printk(KERN_INFO "kmalloced block at %p has been corrupted (overrun):\n",v);
109 printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
110 c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
111 }
112 c1 += 8;
113 }
114 printk(KERN_INFO "line %d kfree(%p)\n",line,v);
115 v = ((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8);
116 kfree(v);
117 }
118
119 #define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
120 #define kfree(x) dbg_kfree(x,__LINE__)
121 *****************************************************************************/
122
123 /*
124 * Function Prototypes
125 */
126
127 /*
128 * WAN device IOCTL handlers
129 */
130
131 static int wanrouter_device_setup(struct wan_device *wandev,
132 wandev_conf_t __user *u_conf);
133 static int wanrouter_device_stat(struct wan_device *wandev,
134 wandev_stat_t __user *u_stat);
135 static int wanrouter_device_shutdown(struct wan_device *wandev);
136 static int wanrouter_device_new_if(struct wan_device *wandev,
137 wanif_conf_t __user *u_conf);
138 static int wanrouter_device_del_if(struct wan_device *wandev,
139 char __user *u_name);
140
141 /*
142 * Miscellaneous
143 */
144
145 static struct wan_device *wanrouter_find_device(char *name);
146 static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
147 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
148 void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
149
150
151
152 /*
153 * Global Data
154 */
155
156 static char wanrouter_fullname[] = "Sangoma WANPIPE Router";
157 static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
158 static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
159 struct wan_device* wanrouter_router_devlist; /* list of registered devices */
160
161 /*
162 * Organize Unique Identifiers for encapsulation/decapsulation
163 */
164
165 static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
166 #if 0
167 static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
168 #endif
169
170 static int __init wanrouter_init(void)
171 {
172 int err;
173
174 printk(KERN_INFO "%s v%u.%u %s\n",
175 wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
176 wanrouter_copyright);
177
178 err = wanrouter_proc_init();
179 if (err)
180 printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
181 wanrouter_modname);
182
183 return err;
184 }
185
186 static void __exit wanrouter_cleanup (void)
187 {
188 wanrouter_proc_cleanup();
189 }
190
191 /*
192 * This is just plain dumb. We should move the bugger to drivers/net/wan,
193 * slap it first in directory and make it module_init(). The only reason
194 * for subsys_initcall() here is that net goes after drivers (why, BTW?)
195 */
196 subsys_initcall(wanrouter_init);
197 module_exit(wanrouter_cleanup);
198
199 /*
200 * Kernel APIs
201 */
202
203 /*
204 * Register WAN device.
205 * o verify device credentials
206 * o create an entry for the device in the /proc/net/router directory
207 * o initialize internally maintained fields of the wan_device structure
208 * o link device data space to a singly-linked list
209 * o if it's the first device, then start kernel 'thread'
210 * o increment module use count
211 *
212 * Return:
213 * 0 Ok
214 * < 0 error.
215 *
216 * Context: process
217 */
218
219
220 int register_wan_device(struct wan_device *wandev)
221 {
222 int err, namelen;
223
224 if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
225 (wandev->name == NULL))
226 return -EINVAL;
227
228 namelen = strlen(wandev->name);
229 if (!namelen || (namelen > WAN_DRVNAME_SZ))
230 return -EINVAL;
231
232 if (wanrouter_find_device(wandev->name))
233 return -EEXIST;
234
235 #ifdef WANDEBUG
236 printk(KERN_INFO "%s: registering WAN device %s\n",
237 wanrouter_modname, wandev->name);
238 #endif
239
240 /*
241 * Register /proc directory entry
242 */
243 err = wanrouter_proc_add(wandev);
244 if (err) {
245 printk(KERN_INFO
246 "%s: can't create /proc/net/router/%s entry!\n",
247 wanrouter_modname, wandev->name);
248 return err;
249 }
250
251 /*
252 * Initialize fields of the wan_device structure maintained by the
253 * router and update local data.
254 */
255
256 wandev->ndev = 0;
257 wandev->dev = NULL;
258 wandev->next = wanrouter_router_devlist;
259 wanrouter_router_devlist = wandev;
260 return 0;
261 }
262
263 /*
264 * Unregister WAN device.
265 * o shut down device
266 * o unlink device data space from the linked list
267 * o delete device entry in the /proc/net/router directory
268 * o decrement module use count
269 *
270 * Return: 0 Ok
271 * <0 error.
272 * Context: process
273 */
274
275
276 int unregister_wan_device(char *name)
277 {
278 struct wan_device *wandev, *prev;
279
280 if (name == NULL)
281 return -EINVAL;
282
283 for (wandev = wanrouter_router_devlist, prev = NULL;
284 wandev && strcmp(wandev->name, name);
285 prev = wandev, wandev = wandev->next)
286 ;
287 if (wandev == NULL)
288 return -ENODEV;
289
290 #ifdef WANDEBUG
291 printk(KERN_INFO "%s: unregistering WAN device %s\n",
292 wanrouter_modname, name);
293 #endif
294
295 if (wandev->state != WAN_UNCONFIGURED)
296 wanrouter_device_shutdown(wandev);
297
298 if (prev)
299 prev->next = wandev->next;
300 else
301 wanrouter_router_devlist = wandev->next;
302
303 wanrouter_proc_delete(wandev);
304 return 0;
305 }
306
307 /*
308 * Encapsulate packet.
309 *
310 * Return: encapsulation header size
311 * < 0 - unsupported Ethertype
312 *
313 * Notes:
314 * 1. This function may be called on interrupt context.
315 */
316
317
318 int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
319 unsigned short type)
320 {
321 int hdr_len = 0;
322
323 switch (type) {
324 case ETH_P_IP: /* IP datagram encapsulation */
325 hdr_len += 1;
326 skb_push(skb, 1);
327 skb->data[0] = NLPID_IP;
328 break;
329
330 case ETH_P_IPX: /* SNAP encapsulation */
331 case ETH_P_ARP:
332 hdr_len += 7;
333 skb_push(skb, 7);
334 skb->data[0] = 0;
335 skb->data[1] = NLPID_SNAP;
336 memcpy(&skb->data[2], wanrouter_oui_ether,
337 sizeof(wanrouter_oui_ether));
338 *((unsigned short*)&skb->data[5]) = htons(type);
339 break;
340
341 default: /* Unknown packet type */
342 printk(KERN_INFO
343 "%s: unsupported Ethertype 0x%04X on interface %s!\n",
344 wanrouter_modname, type, dev->name);
345 hdr_len = -EINVAL;
346 }
347 return hdr_len;
348 }
349
350
351 /*
352 * Decapsulate packet.
353 *
354 * Return: Ethertype (in network order)
355 * 0 unknown encapsulation
356 *
357 * Notes:
358 * 1. This function may be called on interrupt context.
359 */
360
361
362 __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
363 {
364 int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
365 __be16 ethertype;
366
367 switch (skb->data[cnt]) {
368 case NLPID_IP: /* IP datagramm */
369 ethertype = htons(ETH_P_IP);
370 cnt += 1;
371 break;
372
373 case NLPID_SNAP: /* SNAP encapsulation */
374 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
375 sizeof(wanrouter_oui_ether))){
376 printk(KERN_INFO
377 "%s: unsupported SNAP OUI %02X-%02X-%02X "
378 "on interface %s!\n", wanrouter_modname,
379 skb->data[cnt+1], skb->data[cnt+2],
380 skb->data[cnt+3], dev->name);
381 return 0;
382 }
383 ethertype = *((__be16*)&skb->data[cnt+4]);
384 cnt += 6;
385 break;
386
387 /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
388
389 default:
390 printk(KERN_INFO
391 "%s: unsupported NLPID 0x%02X on interface %s!\n",
392 wanrouter_modname, skb->data[cnt], dev->name);
393 return 0;
394 }
395 skb->protocol = ethertype;
396 skb->pkt_type = PACKET_HOST; /* Physically point to point */
397 skb_pull(skb, cnt);
398 skb->mac.raw = skb->data;
399 return ethertype;
400 }
401
402
403 /*
404 * WAN device IOCTL.
405 * o find WAN device associated with this node
406 * o execute requested action or pass command to the device driver
407 */
408
409 int wanrouter_ioctl(struct inode *inode, struct file *file,
410 unsigned int cmd, unsigned long arg)
411 {
412 int err = 0;
413 struct proc_dir_entry *dent;
414 struct wan_device *wandev;
415 void __user *data = (void __user *)arg;
416
417 if (!capable(CAP_NET_ADMIN))
418 return -EPERM;
419
420 if ((cmd >> 8) != ROUTER_IOCTL)
421 return -EINVAL;
422
423 dent = PDE(inode);
424 if ((dent == NULL) || (dent->data == NULL))
425 return -EINVAL;
426
427 wandev = dent->data;
428 if (wandev->magic != ROUTER_MAGIC)
429 return -EINVAL;
430
431 switch (cmd) {
432 case ROUTER_SETUP:
433 err = wanrouter_device_setup(wandev, data);
434 break;
435
436 case ROUTER_DOWN:
437 err = wanrouter_device_shutdown(wandev);
438 break;
439
440 case ROUTER_STAT:
441 err = wanrouter_device_stat(wandev, data);
442 break;
443
444 case ROUTER_IFNEW:
445 err = wanrouter_device_new_if(wandev, data);
446 break;
447
448 case ROUTER_IFDEL:
449 err = wanrouter_device_del_if(wandev, data);
450 break;
451
452 case ROUTER_IFSTAT:
453 break;
454
455 default:
456 if ((cmd >= ROUTER_USER) &&
457 (cmd <= ROUTER_USER_MAX) &&
458 wandev->ioctl)
459 err = wandev->ioctl(wandev, cmd, arg);
460 else err = -EINVAL;
461 }
462 return err;
463 }
464
465 /*
466 * WAN Driver IOCTL Handlers
467 */
468
469 /*
470 * Setup WAN link device.
471 * o verify user address space
472 * o allocate kernel memory and copy configuration data to kernel space
473 * o if configuration data includes extension, copy it to kernel space too
474 * o call driver's setup() entry point
475 */
476
477 static int wanrouter_device_setup(struct wan_device *wandev,
478 wandev_conf_t __user *u_conf)
479 {
480 void *data = NULL;
481 wandev_conf_t *conf;
482 int err = -EINVAL;
483
484 if (wandev->setup == NULL) { /* Nothing to do ? */
485 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
486 wandev->name);
487 return 0;
488 }
489
490 conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
491 if (conf == NULL){
492 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
493 wandev->name);
494 return -ENOBUFS;
495 }
496
497 if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
498 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
499 wandev->name);
500 kfree(conf);
501 return -EFAULT;
502 }
503
504 if (conf->magic != ROUTER_MAGIC) {
505 kfree(conf);
506 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
507 wandev->name);
508 return -EINVAL;
509 }
510
511 if (conf->data_size && conf->data) {
512 if (conf->data_size > 128000 || conf->data_size < 0) {
513 printk(KERN_INFO
514 "%s: ERROR, Invalid firmware data size %i !\n",
515 wandev->name, conf->data_size);
516 kfree(conf);
517 return -EINVAL;
518 }
519
520 data = vmalloc(conf->data_size);
521 if (!data) {
522 printk(KERN_INFO
523 "%s: ERROR, Faild allocate kernel memory !\n",
524 wandev->name);
525 kfree(conf);
526 return -ENOBUFS;
527 }
528 if (!copy_from_user(data, conf->data, conf->data_size)) {
529 conf->data = data;
530 err = wandev->setup(wandev, conf);
531 } else {
532 printk(KERN_INFO
533 "%s: ERROR, Faild to copy from user data !\n",
534 wandev->name);
535 err = -EFAULT;
536 }
537 vfree(data);
538 } else {
539 printk(KERN_INFO
540 "%s: ERROR, No firmware found ! Firmware size = %i !\n",
541 wandev->name, conf->data_size);
542 }
543
544 kfree(conf);
545 return err;
546 }
547
548 /*
549 * Shutdown WAN device.
550 * o delete all not opened logical channels for this device
551 * o call driver's shutdown() entry point
552 */
553
554 static int wanrouter_device_shutdown(struct wan_device *wandev)
555 {
556 struct net_device *dev;
557 int err=0;
558
559 if (wandev->state == WAN_UNCONFIGURED)
560 return 0;
561
562 printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
563
564 for (dev = wandev->dev; dev;) {
565 err = wanrouter_delete_interface(wandev, dev->name);
566 if (err)
567 return err;
568 /* The above function deallocates the current dev
569 * structure. Therefore, we cannot use dev->priv
570 * as the next element: wandev->dev points to the
571 * next element */
572 dev = wandev->dev;
573 }
574
575 if (wandev->ndev)
576 return -EBUSY; /* there are opened interfaces */
577
578 if (wandev->shutdown)
579 err=wandev->shutdown(wandev);
580
581 return err;
582 }
583
584 /*
585 * Get WAN device status & statistics.
586 */
587
588 static int wanrouter_device_stat(struct wan_device *wandev,
589 wandev_stat_t __user *u_stat)
590 {
591 wandev_stat_t stat;
592
593 memset(&stat, 0, sizeof(stat));
594
595 /* Ask device driver to update device statistics */
596 if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
597 wandev->update(wandev);
598
599 /* Fill out structure */
600 stat.ndev = wandev->ndev;
601 stat.state = wandev->state;
602
603 if (copy_to_user(u_stat, &stat, sizeof(stat)))
604 return -EFAULT;
605
606 return 0;
607 }
608
609 /*
610 * Create new WAN interface.
611 * o verify user address space
612 * o copy configuration data to kernel address space
613 * o allocate network interface data space
614 * o call driver's new_if() entry point
615 * o make sure there is no interface name conflict
616 * o register network interface
617 */
618
619 static int wanrouter_device_new_if(struct wan_device *wandev,
620 wanif_conf_t __user *u_conf)
621 {
622 wanif_conf_t *cnf;
623 struct net_device *dev = NULL;
624 #ifdef CONFIG_WANPIPE_MULTPPP
625 struct ppp_device *pppdev=NULL;
626 #endif
627 int err;
628
629 if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
630 return -ENODEV;
631
632 cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
633 if (!cnf)
634 return -ENOBUFS;
635
636 err = -EFAULT;
637 if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
638 goto out;
639
640 err = -EINVAL;
641 if (cnf->magic != ROUTER_MAGIC)
642 goto out;
643
644 if (cnf->config_id == WANCONFIG_MPPP) {
645 #ifdef CONFIG_WANPIPE_MULTPPP
646 pppdev = kmalloc(sizeof(struct ppp_device), GFP_KERNEL);
647 err = -ENOBUFS;
648 if (pppdev == NULL)
649 goto out;
650 memset(pppdev, 0, sizeof(struct ppp_device));
651 pppdev->dev = kmalloc(sizeof(struct net_device), GFP_KERNEL);
652 if (pppdev->dev == NULL) {
653 kfree(pppdev);
654 err = -ENOBUFS;
655 goto out;
656 }
657 memset(pppdev->dev, 0, sizeof(struct net_device));
658 err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
659 dev = pppdev->dev;
660 #else
661 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
662 wandev->name);
663 err = -EPROTONOSUPPORT;
664 goto out;
665 #endif
666 } else {
667 dev = kmalloc(sizeof(struct net_device), GFP_KERNEL);
668 err = -ENOBUFS;
669 if (dev == NULL)
670 goto out;
671 memset(dev, 0, sizeof(struct net_device));
672 err = wandev->new_if(wandev, dev, cnf);
673 }
674
675 if (!err) {
676 /* Register network interface. This will invoke init()
677 * function supplied by the driver. If device registered
678 * successfully, add it to the interface list.
679 */
680
681 if (dev->name == NULL) {
682 err = -EINVAL;
683 } else {
684
685 #ifdef WANDEBUG
686 printk(KERN_INFO "%s: registering interface %s...\n",
687 wanrouter_modname, dev->name);
688 #endif
689
690 err = register_netdev(dev);
691 if (!err) {
692 struct net_device *slave = NULL;
693 unsigned long smp_flags=0;
694
695 lock_adapter_irq(&wandev->lock, &smp_flags);
696
697 if (wandev->dev == NULL) {
698 wandev->dev = dev;
699 } else {
700 for (slave=wandev->dev;
701 *((struct net_device **)slave->priv);
702 slave = *((struct net_device **)slave->priv));
703
704 *((struct net_device **)slave->priv) = dev;
705 }
706 ++wandev->ndev;
707
708 unlock_adapter_irq(&wandev->lock, &smp_flags);
709 err = 0; /* done !!! */
710 goto out;
711 }
712 }
713 if (wandev->del_if)
714 wandev->del_if(wandev, dev);
715 }
716
717 /* This code has moved from del_if() function */
718 kfree(dev->priv);
719 dev->priv = NULL;
720
721 #ifdef CONFIG_WANPIPE_MULTPPP
722 if (cnf->config_id == WANCONFIG_MPPP)
723 kfree(pppdev);
724 else
725 kfree(dev);
726 #else
727 /* Sync PPP is disabled */
728 if (cnf->config_id != WANCONFIG_MPPP)
729 kfree(dev);
730 #endif
731
732 out:
733 kfree(cnf);
734 return err;
735 }
736
737
738 /*
739 * Delete WAN logical channel.
740 * o verify user address space
741 * o copy configuration data to kernel address space
742 */
743
744 static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
745 {
746 char name[WAN_IFNAME_SZ + 1];
747 int err = 0;
748
749 if (wandev->state == WAN_UNCONFIGURED)
750 return -ENODEV;
751
752 memset(name, 0, sizeof(name));
753
754 if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
755 return -EFAULT;
756
757 err = wanrouter_delete_interface(wandev, name);
758 if (err)
759 return err;
760
761 /* If last interface being deleted, shutdown card
762 * This helps with administration at leaf nodes
763 * (You can tell if the person at the other end of the phone
764 * has an interface configured) and avoids DoS vulnerabilities
765 * in binary driver files - this fixes a problem with the current
766 * Sangoma driver going into strange states when all the network
767 * interfaces are deleted and the link irrecoverably disconnected.
768 */
769
770 if (!wandev->ndev && wandev->shutdown)
771 err = wandev->shutdown(wandev);
772
773 return err;
774 }
775
776 /*
777 * Miscellaneous Functions
778 */
779
780 /*
781 * Find WAN device by name.
782 * Return pointer to the WAN device data space or NULL if device not found.
783 */
784
785 static struct wan_device *wanrouter_find_device(char *name)
786 {
787 struct wan_device *wandev;
788
789 for (wandev = wanrouter_router_devlist;
790 wandev && strcmp(wandev->name, name);
791 wandev = wandev->next);
792 return wandev;
793 }
794
795 /*
796 * Delete WAN logical channel identified by its name.
797 * o find logical channel by its name
798 * o call driver's del_if() entry point
799 * o unregister network interface
800 * o unlink channel data space from linked list of channels
801 * o release channel data space
802 *
803 * Return: 0 success
804 * -ENODEV channel not found.
805 * -EBUSY interface is open
806 *
807 * Note: If (force != 0), then device will be destroyed even if interface
808 * associated with it is open. It's caller's responsibility to make
809 * sure that opened interfaces are not removed!
810 */
811
812 static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
813 {
814 struct net_device *dev = NULL, *prev = NULL;
815 unsigned long smp_flags=0;
816
817 lock_adapter_irq(&wandev->lock, &smp_flags);
818 dev = wandev->dev;
819 prev = NULL;
820 while (dev && strcmp(name, dev->name)) {
821 struct net_device **slave = dev->priv;
822 prev = dev;
823 dev = *slave;
824 }
825 unlock_adapter_irq(&wandev->lock, &smp_flags);
826
827 if (dev == NULL)
828 return -ENODEV; /* interface not found */
829
830 if (netif_running(dev))
831 return -EBUSY; /* interface in use */
832
833 if (wandev->del_if)
834 wandev->del_if(wandev, dev);
835
836 lock_adapter_irq(&wandev->lock, &smp_flags);
837 if (prev) {
838 struct net_device **prev_slave = prev->priv;
839 struct net_device **slave = dev->priv;
840
841 *prev_slave = *slave;
842 } else {
843 struct net_device **slave = dev->priv;
844 wandev->dev = *slave;
845 }
846 --wandev->ndev;
847 unlock_adapter_irq(&wandev->lock, &smp_flags);
848
849 printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
850
851 /* Due to new interface linking method using dev->priv,
852 * this code has moved from del_if() function.*/
853 kfree(dev->priv);
854 dev->priv=NULL;
855
856 unregister_netdev(dev);
857
858 free_netdev(dev);
859
860 return 0;
861 }
862
863 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
864 {
865 spin_lock_irqsave(lock, *smp_flags);
866 }
867
868
869 void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
870 {
871 spin_unlock_irqrestore(lock, *smp_flags);
872 }
873
874 EXPORT_SYMBOL(register_wan_device);
875 EXPORT_SYMBOL(unregister_wan_device);
876 EXPORT_SYMBOL(wanrouter_encapsulate);
877 EXPORT_SYMBOL(wanrouter_type_trans);
878 EXPORT_SYMBOL(lock_adapter_irq);
879 EXPORT_SYMBOL(unlock_adapter_irq);
880
881 MODULE_LICENSE("GPL");
882
883 /*
884 * End
885 */