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[PATCH] pcmcia: fix task state at pccard thread exit
[usb.git] / net / wanrouter / wanmain.c
blob13b650ad22e21a6a6bec891d5bfe8ce4efb52236
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/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 /***********FOR DEBUGGING PURPOSES*********************************************
66 static void * dbg_kmalloc(unsigned int size, int prio, int line) {
67 int i = 0;
68 void * v = kmalloc(size+sizeof(unsigned int)+2*KMEM_SAFETYZONE*8,prio);
69 char * c1 = v;
70 c1 += sizeof(unsigned int);
71 *((unsigned int *)v) = size;
72
73 for (i = 0; i < KMEM_SAFETYZONE; i++) {
74 c1[0] = 'D'; c1[1] = 'E'; c1[2] = 'A'; c1[3] = 'D';
75 c1[4] = 'B'; c1[5] = 'E'; c1[6] = 'E'; c1[7] = 'F';
76 c1 += 8;
77 }
78 c1 += size;
79 for (i = 0; i < KMEM_SAFETYZONE; i++) {
80 c1[0] = 'M'; c1[1] = 'U'; c1[2] = 'N'; c1[3] = 'G';
81 c1[4] = 'W'; c1[5] = 'A'; c1[6] = 'L'; c1[7] = 'L';
82 c1 += 8;
83 }
84 v = ((char *)v) + sizeof(unsigned int) + KMEM_SAFETYZONE*8;
85 printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v);
86 return v;
87 }
88 static void dbg_kfree(void * v, int line) {
89 unsigned int * sp = (unsigned int *)(((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8));
90 unsigned int size = *sp;
91 char * c1 = ((char *)v) - KMEM_SAFETYZONE*8;
92 int i = 0;
93 for (i = 0; i < KMEM_SAFETYZONE; i++) {
94 if ( c1[0] != 'D' || c1[1] != 'E' || c1[2] != 'A' || c1[3] != 'D'
95 || c1[4] != 'B' || c1[5] != 'E' || c1[6] != 'E' || c1[7] != 'F') {
96 printk(KERN_INFO "kmalloced block at %p has been corrupted (underrun)!\n",v);
97 printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
98 c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
99 }
100 c1 += 8;
101 }
102 c1 += size;
103 for (i = 0; i < KMEM_SAFETYZONE; i++) {
104 if ( c1[0] != 'M' || c1[1] != 'U' || c1[2] != 'N' || c1[3] != 'G'
105 || c1[4] != 'W' || c1[5] != 'A' || c1[6] != 'L' || c1[7] != 'L'
106 ) {
107 printk(KERN_INFO "kmalloced block at %p has been corrupted (overrun):\n",v);
108 printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
109 c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
110 }
111 c1 += 8;
112 }
113 printk(KERN_INFO "line %d kfree(%p)\n",line,v);
114 v = ((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8);
115 kfree(v);
116 }
117
118 #define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
119 #define kfree(x) dbg_kfree(x,__LINE__)
120 *****************************************************************************/
121
122 /*
123 * Function Prototypes
124 */
125
126 /*
127 * WAN device IOCTL handlers
128 */
129
130 static int wanrouter_device_setup(struct wan_device *wandev,
131 wandev_conf_t __user *u_conf);
132 static int wanrouter_device_stat(struct wan_device *wandev,
133 wandev_stat_t __user *u_stat);
134 static int wanrouter_device_shutdown(struct wan_device *wandev);
135 static int wanrouter_device_new_if(struct wan_device *wandev,
136 wanif_conf_t __user *u_conf);
137 static int wanrouter_device_del_if(struct wan_device *wandev,
138 char __user *u_name);
139
140 /*
141 * Miscellaneous
142 */
143
144 static struct wan_device *wanrouter_find_device(char *name);
145 static int wanrouter_delete_interface(struct wan_device *wandev, char *name);
146 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
147 void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags);
148
149
150
151 /*
152 * Global Data
153 */
154
155 static char wanrouter_fullname[] = "Sangoma WANPIPE Router";
156 static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
157 static char wanrouter_modname[] = ROUTER_NAME; /* short module name */
158 struct wan_device* wanrouter_router_devlist; /* list of registered devices */
159
160 /*
161 * Organize Unique Identifiers for encapsulation/decapsulation
162 */
163
164 static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 };
165 #if 0
166 static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 };
167 #endif
168
169 static int __init wanrouter_init(void)
170 {
171 int err;
172
173 printk(KERN_INFO "%s v%u.%u %s\n",
174 wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE,
175 wanrouter_copyright);
176
177 err = wanrouter_proc_init();
178 if (err)
179 printk(KERN_INFO "%s: can't create entry in proc filesystem!\n",
180 wanrouter_modname);
181
182 return err;
183 }
184
185 static void __exit wanrouter_cleanup (void)
186 {
187 wanrouter_proc_cleanup();
188 }
189
190 /*
191 * This is just plain dumb. We should move the bugger to drivers/net/wan,
192 * slap it first in directory and make it module_init(). The only reason
193 * for subsys_initcall() here is that net goes after drivers (why, BTW?)
194 */
195 subsys_initcall(wanrouter_init);
196 module_exit(wanrouter_cleanup);
197
198 /*
199 * Kernel APIs
200 */
201
202 /*
203 * Register WAN device.
204 * o verify device credentials
205 * o create an entry for the device in the /proc/net/router directory
206 * o initialize internally maintained fields of the wan_device structure
207 * o link device data space to a singly-linked list
208 * o if it's the first device, then start kernel 'thread'
209 * o increment module use count
210 *
211 * Return:
212 * 0 Ok
213 * < 0 error.
214 *
215 * Context: process
216 */
217
218
219 int register_wan_device(struct wan_device *wandev)
220 {
221 int err, namelen;
222
223 if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) ||
224 (wandev->name == NULL))
225 return -EINVAL;
226
227 namelen = strlen(wandev->name);
228 if (!namelen || (namelen > WAN_DRVNAME_SZ))
229 return -EINVAL;
230
231 if (wanrouter_find_device(wandev->name))
232 return -EEXIST;
233
234 #ifdef WANDEBUG
235 printk(KERN_INFO "%s: registering WAN device %s\n",
236 wanrouter_modname, wandev->name);
237 #endif
238
239 /*
240 * Register /proc directory entry
241 */
242 err = wanrouter_proc_add(wandev);
243 if (err) {
244 printk(KERN_INFO
245 "%s: can't create /proc/net/router/%s entry!\n",
246 wanrouter_modname, wandev->name);
247 return err;
248 }
249
250 /*
251 * Initialize fields of the wan_device structure maintained by the
252 * router and update local data.
253 */
254
255 wandev->ndev = 0;
256 wandev->dev = NULL;
257 wandev->next = wanrouter_router_devlist;
258 wanrouter_router_devlist = wandev;
259 return 0;
260 }
261
262 /*
263 * Unregister WAN device.
264 * o shut down device
265 * o unlink device data space from the linked list
266 * o delete device entry in the /proc/net/router directory
267 * o decrement module use count
268 *
269 * Return: 0 Ok
270 * <0 error.
271 * Context: process
272 */
273
274
275 int unregister_wan_device(char *name)
276 {
277 struct wan_device *wandev, *prev;
278
279 if (name == NULL)
280 return -EINVAL;
281
282 for (wandev = wanrouter_router_devlist, prev = NULL;
283 wandev && strcmp(wandev->name, name);
284 prev = wandev, wandev = wandev->next)
285 ;
286 if (wandev == NULL)
287 return -ENODEV;
288
289 #ifdef WANDEBUG
290 printk(KERN_INFO "%s: unregistering WAN device %s\n",
291 wanrouter_modname, name);
292 #endif
293
294 if (wandev->state != WAN_UNCONFIGURED)
295 wanrouter_device_shutdown(wandev);
296
297 if (prev)
298 prev->next = wandev->next;
299 else
300 wanrouter_router_devlist = wandev->next;
301
302 wanrouter_proc_delete(wandev);
303 return 0;
304 }
305
306 /*
307 * Encapsulate packet.
308 *
309 * Return: encapsulation header size
310 * < 0 - unsupported Ethertype
311 *
312 * Notes:
313 * 1. This function may be called on interrupt context.
314 */
315
316
317 int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev,
318 unsigned short type)
319 {
320 int hdr_len = 0;
321
322 switch (type) {
323 case ETH_P_IP: /* IP datagram encapsulation */
324 hdr_len += 1;
325 skb_push(skb, 1);
326 skb->data[0] = NLPID_IP;
327 break;
328
329 case ETH_P_IPX: /* SNAP encapsulation */
330 case ETH_P_ARP:
331 hdr_len += 7;
332 skb_push(skb, 7);
333 skb->data[0] = 0;
334 skb->data[1] = NLPID_SNAP;
335 memcpy(&skb->data[2], wanrouter_oui_ether,
336 sizeof(wanrouter_oui_ether));
337 *((unsigned short*)&skb->data[5]) = htons(type);
338 break;
339
340 default: /* Unknown packet type */
341 printk(KERN_INFO
342 "%s: unsupported Ethertype 0x%04X on interface %s!\n",
343 wanrouter_modname, type, dev->name);
344 hdr_len = -EINVAL;
345 }
346 return hdr_len;
347 }
348
349
350 /*
351 * Decapsulate packet.
352 *
353 * Return: Ethertype (in network order)
354 * 0 unknown encapsulation
355 *
356 * Notes:
357 * 1. This function may be called on interrupt context.
358 */
359
360
361 __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev)
362 {
363 int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */
364 __be16 ethertype;
365
366 switch (skb->data[cnt]) {
367 case NLPID_IP: /* IP datagramm */
368 ethertype = htons(ETH_P_IP);
369 cnt += 1;
370 break;
371
372 case NLPID_SNAP: /* SNAP encapsulation */
373 if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether,
374 sizeof(wanrouter_oui_ether))){
375 printk(KERN_INFO
376 "%s: unsupported SNAP OUI %02X-%02X-%02X "
377 "on interface %s!\n", wanrouter_modname,
378 skb->data[cnt+1], skb->data[cnt+2],
379 skb->data[cnt+3], dev->name);
380 return 0;
381 }
382 ethertype = *((__be16*)&skb->data[cnt+4]);
383 cnt += 6;
384 break;
385
386 /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */
387
388 default:
389 printk(KERN_INFO
390 "%s: unsupported NLPID 0x%02X on interface %s!\n",
391 wanrouter_modname, skb->data[cnt], dev->name);
392 return 0;
393 }
394 skb->protocol = ethertype;
395 skb->pkt_type = PACKET_HOST; /* Physically point to point */
396 skb_pull(skb, cnt);
397 skb->mac.raw = skb->data;
398 return ethertype;
399 }
400
401
402 /*
403 * WAN device IOCTL.
404 * o find WAN device associated with this node
405 * o execute requested action or pass command to the device driver
406 */
407
408 int wanrouter_ioctl(struct inode *inode, struct file *file,
409 unsigned int cmd, unsigned long arg)
410 {
411 int err = 0;
412 struct proc_dir_entry *dent;
413 struct wan_device *wandev;
414 void __user *data = (void __user *)arg;
415
416 if (!capable(CAP_NET_ADMIN))
417 return -EPERM;
418
419 if ((cmd >> 8) != ROUTER_IOCTL)
420 return -EINVAL;
421
422 dent = PDE(inode);
423 if ((dent == NULL) || (dent->data == NULL))
424 return -EINVAL;
425
426 wandev = dent->data;
427 if (wandev->magic != ROUTER_MAGIC)
428 return -EINVAL;
429
430 switch (cmd) {
431 case ROUTER_SETUP:
432 err = wanrouter_device_setup(wandev, data);
433 break;
434
435 case ROUTER_DOWN:
436 err = wanrouter_device_shutdown(wandev);
437 break;
438
439 case ROUTER_STAT:
440 err = wanrouter_device_stat(wandev, data);
441 break;
442
443 case ROUTER_IFNEW:
444 err = wanrouter_device_new_if(wandev, data);
445 break;
446
447 case ROUTER_IFDEL:
448 err = wanrouter_device_del_if(wandev, data);
449 break;
450
451 case ROUTER_IFSTAT:
452 break;
453
454 default:
455 if ((cmd >= ROUTER_USER) &&
456 (cmd <= ROUTER_USER_MAX) &&
457 wandev->ioctl)
458 err = wandev->ioctl(wandev, cmd, arg);
459 else err = -EINVAL;
460 }
461 return err;
462 }
463
464 /*
465 * WAN Driver IOCTL Handlers
466 */
467
468 /*
469 * Setup WAN link device.
470 * o verify user address space
471 * o allocate kernel memory and copy configuration data to kernel space
472 * o if configuration data includes extension, copy it to kernel space too
473 * o call driver's setup() entry point
474 */
475
476 static int wanrouter_device_setup(struct wan_device *wandev,
477 wandev_conf_t __user *u_conf)
478 {
479 void *data = NULL;
480 wandev_conf_t *conf;
481 int err = -EINVAL;
482
483 if (wandev->setup == NULL) { /* Nothing to do ? */
484 printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
485 wandev->name);
486 return 0;
487 }
488
489 conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
490 if (conf == NULL){
491 printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
492 wandev->name);
493 return -ENOBUFS;
494 }
495
496 if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
497 printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
498 wandev->name);
499 kfree(conf);
500 return -EFAULT;
501 }
502
503 if (conf->magic != ROUTER_MAGIC) {
504 kfree(conf);
505 printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
506 wandev->name);
507 return -EINVAL;
508 }
509
510 if (conf->data_size && conf->data) {
511 if (conf->data_size > 128000 || conf->data_size < 0) {
512 printk(KERN_INFO
513 "%s: ERROR, Invalid firmware data size %i !\n",
514 wandev->name, conf->data_size);
515 kfree(conf);
516 return -EINVAL;
517 }
518
519 data = vmalloc(conf->data_size);
520 if (!data) {
521 printk(KERN_INFO
522 "%s: ERROR, Faild allocate kernel memory !\n",
523 wandev->name);
524 kfree(conf);
525 return -ENOBUFS;
526 }
527 if (!copy_from_user(data, conf->data, conf->data_size)) {
528 conf->data = data;
529 err = wandev->setup(wandev, conf);
530 } else {
531 printk(KERN_INFO
532 "%s: ERROR, Faild to copy from user data !\n",
533 wandev->name);
534 err = -EFAULT;
535 }
536 vfree(data);
537 } else {
538 printk(KERN_INFO
539 "%s: ERROR, No firmware found ! Firmware size = %i !\n",
540 wandev->name, conf->data_size);
541 }
542
543 kfree(conf);
544 return err;
545 }
546
547 /*
548 * Shutdown WAN device.
549 * o delete all not opened logical channels for this device
550 * o call driver's shutdown() entry point
551 */
552
553 static int wanrouter_device_shutdown(struct wan_device *wandev)
554 {
555 struct net_device *dev;
556 int err=0;
557
558 if (wandev->state == WAN_UNCONFIGURED)
559 return 0;
560
561 printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);
562
563 for (dev = wandev->dev; dev;) {
564 err = wanrouter_delete_interface(wandev, dev->name);
565 if (err)
566 return err;
567 /* The above function deallocates the current dev
568 * structure. Therefore, we cannot use dev->priv
569 * as the next element: wandev->dev points to the
570 * next element */
571 dev = wandev->dev;
572 }
573
574 if (wandev->ndev)
575 return -EBUSY; /* there are opened interfaces */
576
577 if (wandev->shutdown)
578 err=wandev->shutdown(wandev);
579
580 return err;
581 }
582
583 /*
584 * Get WAN device status & statistics.
585 */
586
587 static int wanrouter_device_stat(struct wan_device *wandev,
588 wandev_stat_t __user *u_stat)
589 {
590 wandev_stat_t stat;
591
592 memset(&stat, 0, sizeof(stat));
593
594 /* Ask device driver to update device statistics */
595 if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
596 wandev->update(wandev);
597
598 /* Fill out structure */
599 stat.ndev = wandev->ndev;
600 stat.state = wandev->state;
601
602 if (copy_to_user(u_stat, &stat, sizeof(stat)))
603 return -EFAULT;
604
605 return 0;
606 }
607
608 /*
609 * Create new WAN interface.
610 * o verify user address space
611 * o copy configuration data to kernel address space
612 * o allocate network interface data space
613 * o call driver's new_if() entry point
614 * o make sure there is no interface name conflict
615 * o register network interface
616 */
617
618 static int wanrouter_device_new_if(struct wan_device *wandev,
619 wanif_conf_t __user *u_conf)
620 {
621 wanif_conf_t *cnf;
622 struct net_device *dev = NULL;
623 #ifdef CONFIG_WANPIPE_MULTPPP
624 struct ppp_device *pppdev=NULL;
625 #endif
626 int err;
627
628 if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
629 return -ENODEV;
630
631 cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
632 if (!cnf)
633 return -ENOBUFS;
634
635 err = -EFAULT;
636 if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
637 goto out;
638
639 err = -EINVAL;
640 if (cnf->magic != ROUTER_MAGIC)
641 goto out;
642
643 if (cnf->config_id == WANCONFIG_MPPP) {
644 #ifdef CONFIG_WANPIPE_MULTPPP
645 pppdev = kmalloc(sizeof(struct ppp_device), GFP_KERNEL);
646 err = -ENOBUFS;
647 if (pppdev == NULL)
648 goto out;
649 memset(pppdev, 0, sizeof(struct ppp_device));
650 pppdev->dev = kmalloc(sizeof(struct net_device), GFP_KERNEL);
651 if (pppdev->dev == NULL) {
652 kfree(pppdev);
653 err = -ENOBUFS;
654 goto out;
655 }
656 memset(pppdev->dev, 0, sizeof(struct net_device));
657 err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
658 dev = pppdev->dev;
659 #else
660 printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
661 wandev->name);
662 err = -EPROTONOSUPPORT;
663 goto out;
664 #endif
665 } else {
666 dev = kmalloc(sizeof(struct net_device), GFP_KERNEL);
667 err = -ENOBUFS;
668 if (dev == NULL)
669 goto out;
670 memset(dev, 0, sizeof(struct net_device));
671 err = wandev->new_if(wandev, dev, cnf);
672 }
673
674 if (!err) {
675 /* Register network interface. This will invoke init()
676 * function supplied by the driver. If device registered
677 * successfully, add it to the interface list.
678 */
679
680 if (dev->name == NULL) {
681 err = -EINVAL;
682 } else {
683
684 #ifdef WANDEBUG
685 printk(KERN_INFO "%s: registering interface %s...\n",
686 wanrouter_modname, dev->name);
687 #endif
688
689 err = register_netdev(dev);
690 if (!err) {
691 struct net_device *slave = NULL;
692 unsigned long smp_flags=0;
693
694 lock_adapter_irq(&wandev->lock, &smp_flags);
695
696 if (wandev->dev == NULL) {
697 wandev->dev = dev;
698 } else {
699 for (slave=wandev->dev;
700 *((struct net_device **)slave->priv);
701 slave = *((struct net_device **)slave->priv));
702
703 *((struct net_device **)slave->priv) = dev;
704 }
705 ++wandev->ndev;
706
707 unlock_adapter_irq(&wandev->lock, &smp_flags);
708 err = 0; /* done !!! */
709 goto out;
710 }
711 }
712 if (wandev->del_if)
713 wandev->del_if(wandev, dev);
714 }
715
716 /* This code has moved from del_if() function */
717 if (dev->priv) {
718 kfree(dev->priv);
719 dev->priv = NULL;
720 }
721
722 #ifdef CONFIG_WANPIPE_MULTPPP
723 if (cnf->config_id == WANCONFIG_MPPP)
724 kfree(pppdev);
725 else
726 kfree(dev);
727 #else
728 /* Sync PPP is disabled */
729 if (cnf->config_id != WANCONFIG_MPPP)
730 kfree(dev);
731 #endif
732
733 out:
734 kfree(cnf);
735 return err;
736 }
737
738
739 /*
740 * Delete WAN logical channel.
741 * o verify user address space
742 * o copy configuration data to kernel address space
743 */
744
745 static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
746 {
747 char name[WAN_IFNAME_SZ + 1];
748 int err = 0;
749
750 if (wandev->state == WAN_UNCONFIGURED)
751 return -ENODEV;
752
753 memset(name, 0, sizeof(name));
754
755 if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
756 return -EFAULT;
757
758 err = wanrouter_delete_interface(wandev, name);
759 if (err)
760 return err;
761
762 /* If last interface being deleted, shutdown card
763 * This helps with administration at leaf nodes
764 * (You can tell if the person at the other end of the phone
765 * has an interface configured) and avoids DoS vulnerabilities
766 * in binary driver files - this fixes a problem with the current
767 * Sangoma driver going into strange states when all the network
768 * interfaces are deleted and the link irrecoverably disconnected.
769 */
770
771 if (!wandev->ndev && wandev->shutdown)
772 err = wandev->shutdown(wandev);
773
774 return err;
775 }
776
777 /*
778 * Miscellaneous Functions
779 */
780
781 /*
782 * Find WAN device by name.
783 * Return pointer to the WAN device data space or NULL if device not found.
784 */
785
786 static struct wan_device *wanrouter_find_device(char *name)
787 {
788 struct wan_device *wandev;
789
790 for (wandev = wanrouter_router_devlist;
791 wandev && strcmp(wandev->name, name);
792 wandev = wandev->next);
793 return wandev;
794 }
795
796 /*
797 * Delete WAN logical channel identified by its name.
798 * o find logical channel by its name
799 * o call driver's del_if() entry point
800 * o unregister network interface
801 * o unlink channel data space from linked list of channels
802 * o release channel data space
803 *
804 * Return: 0 success
805 * -ENODEV channel not found.
806 * -EBUSY interface is open
807 *
808 * Note: If (force != 0), then device will be destroyed even if interface
809 * associated with it is open. It's caller's responsibility to make
810 * sure that opened interfaces are not removed!
811 */
812
813 static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
814 {
815 struct net_device *dev = NULL, *prev = NULL;
816 unsigned long smp_flags=0;
817
818 lock_adapter_irq(&wandev->lock, &smp_flags);
819 dev = wandev->dev;
820 prev = NULL;
821 while (dev && strcmp(name, dev->name)) {
822 struct net_device **slave = dev->priv;
823 prev = dev;
824 dev = *slave;
825 }
826 unlock_adapter_irq(&wandev->lock, &smp_flags);
827
828 if (dev == NULL)
829 return -ENODEV; /* interface not found */
830
831 if (netif_running(dev))
832 return -EBUSY; /* interface in use */
833
834 if (wandev->del_if)
835 wandev->del_if(wandev, dev);
836
837 lock_adapter_irq(&wandev->lock, &smp_flags);
838 if (prev) {
839 struct net_device **prev_slave = prev->priv;
840 struct net_device **slave = dev->priv;
841
842 *prev_slave = *slave;
843 } else {
844 struct net_device **slave = dev->priv;
845 wandev->dev = *slave;
846 }
847 --wandev->ndev;
848 unlock_adapter_irq(&wandev->lock, &smp_flags);
849
850 printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);
851
852 /* Due to new interface linking method using dev->priv,
853 * this code has moved from del_if() function.*/
854 if (dev->priv){
855 kfree(dev->priv);
856 dev->priv=NULL;
857 }
858
859 unregister_netdev(dev);
860
861 free_netdev(dev);
862
863 return 0;
864 }
865
866 void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
867 {
868 spin_lock_irqsave(lock, *smp_flags);
869 }
870
871
872 void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
873 {
874 spin_unlock_irqrestore(lock, *smp_flags);
875 }
876
877 EXPORT_SYMBOL(register_wan_device);
878 EXPORT_SYMBOL(unregister_wan_device);
879 EXPORT_SYMBOL(wanrouter_encapsulate);
880 EXPORT_SYMBOL(wanrouter_type_trans);
881 EXPORT_SYMBOL(lock_adapter_irq);
882 EXPORT_SYMBOL(unlock_adapter_irq);
883
884 MODULE_LICENSE("GPL");
885
886 /*
887 * End
888 */
USB Experimental Work