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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 | 50 | #include <linux/slab.h> /* kmalloc(), kfree() */ |
15fd0cd9 | 51 | #include <linux/mutex.h> |
e49332bd | 52 | #include <linux/mm.h> |
1da177e4 LT |
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. */ | |
1da177e4 LT |
61 | |
62 | #define KMEM_SAFETYZONE 8 | |
63 | ||
7be6065b WC |
64 | #define DEV_TO_SLAVE(dev) (*((struct net_device **)netdev_priv(dev))) |
65 | ||
1da177e4 LT |
66 | /* |
67 | * Function Prototypes | |
68 | */ | |
69 | ||
70 | /* | |
71 | * WAN device IOCTL handlers | |
72 | */ | |
73 | ||
15fd0cd9 | 74 | static DEFINE_MUTEX(wanrouter_mutex); |
1da177e4 LT |
75 | static int wanrouter_device_setup(struct wan_device *wandev, |
76 | wandev_conf_t __user *u_conf); | |
77 | static int wanrouter_device_stat(struct wan_device *wandev, | |
78 | wandev_stat_t __user *u_stat); | |
79 | static int wanrouter_device_shutdown(struct wan_device *wandev); | |
80 | static int wanrouter_device_new_if(struct wan_device *wandev, | |
81 | wanif_conf_t __user *u_conf); | |
82 | static int wanrouter_device_del_if(struct wan_device *wandev, | |
83 | char __user *u_name); | |
84 | ||
85 | /* | |
86 | * Miscellaneous | |
87 | */ | |
88 | ||
89 | static struct wan_device *wanrouter_find_device(char *name); | |
90 | static int wanrouter_delete_interface(struct wan_device *wandev, char *name); | |
9ee62630 HE |
91 | static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
92 | __acquires(lock); | |
93 | static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) | |
94 | __releases(lock); | |
1da177e4 LT |
95 | |
96 | ||
97 | ||
98 | /* | |
99 | * Global Data | |
100 | */ | |
101 | ||
102 | static char wanrouter_fullname[] = "Sangoma WANPIPE Router"; | |
103 | static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc."; | |
104 | static char wanrouter_modname[] = ROUTER_NAME; /* short module name */ | |
105 | struct wan_device* wanrouter_router_devlist; /* list of registered devices */ | |
106 | ||
107 | /* | |
108 | * Organize Unique Identifiers for encapsulation/decapsulation | |
109 | */ | |
110 | ||
1da177e4 | 111 | #if 0 |
97353cb4 | 112 | static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 }; |
1da177e4 LT |
113 | static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 }; |
114 | #endif | |
115 | ||
116 | static int __init wanrouter_init(void) | |
117 | { | |
118 | int err; | |
119 | ||
120 | printk(KERN_INFO "%s v%u.%u %s\n", | |
121 | wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE, | |
122 | wanrouter_copyright); | |
123 | ||
124 | err = wanrouter_proc_init(); | |
125 | if (err) | |
126 | printk(KERN_INFO "%s: can't create entry in proc filesystem!\n", | |
127 | wanrouter_modname); | |
128 | ||
129 | return err; | |
130 | } | |
131 | ||
132 | static void __exit wanrouter_cleanup (void) | |
133 | { | |
134 | wanrouter_proc_cleanup(); | |
135 | } | |
136 | ||
137 | /* | |
138 | * This is just plain dumb. We should move the bugger to drivers/net/wan, | |
139 | * slap it first in directory and make it module_init(). The only reason | |
140 | * for subsys_initcall() here is that net goes after drivers (why, BTW?) | |
141 | */ | |
142 | subsys_initcall(wanrouter_init); | |
143 | module_exit(wanrouter_cleanup); | |
144 | ||
145 | /* | |
146 | * Kernel APIs | |
147 | */ | |
148 | ||
149 | /* | |
150 | * Register WAN device. | |
151 | * o verify device credentials | |
152 | * o create an entry for the device in the /proc/net/router directory | |
153 | * o initialize internally maintained fields of the wan_device structure | |
154 | * o link device data space to a singly-linked list | |
155 | * o if it's the first device, then start kernel 'thread' | |
156 | * o increment module use count | |
157 | * | |
158 | * Return: | |
159 | * 0 Ok | |
160 | * < 0 error. | |
161 | * | |
162 | * Context: process | |
163 | */ | |
164 | ||
165 | ||
166 | int register_wan_device(struct wan_device *wandev) | |
167 | { | |
168 | int err, namelen; | |
169 | ||
170 | if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) || | |
171 | (wandev->name == NULL)) | |
172 | return -EINVAL; | |
173 | ||
174 | namelen = strlen(wandev->name); | |
175 | if (!namelen || (namelen > WAN_DRVNAME_SZ)) | |
176 | return -EINVAL; | |
177 | ||
178 | if (wanrouter_find_device(wandev->name)) | |
179 | return -EEXIST; | |
180 | ||
181 | #ifdef WANDEBUG | |
182 | printk(KERN_INFO "%s: registering WAN device %s\n", | |
183 | wanrouter_modname, wandev->name); | |
184 | #endif | |
185 | ||
186 | /* | |
187 | * Register /proc directory entry | |
188 | */ | |
189 | err = wanrouter_proc_add(wandev); | |
190 | if (err) { | |
191 | printk(KERN_INFO | |
192 | "%s: can't create /proc/net/router/%s entry!\n", | |
193 | wanrouter_modname, wandev->name); | |
194 | return err; | |
195 | } | |
196 | ||
197 | /* | |
198 | * Initialize fields of the wan_device structure maintained by the | |
199 | * router and update local data. | |
200 | */ | |
201 | ||
202 | wandev->ndev = 0; | |
203 | wandev->dev = NULL; | |
204 | wandev->next = wanrouter_router_devlist; | |
205 | wanrouter_router_devlist = wandev; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | /* | |
210 | * Unregister WAN device. | |
211 | * o shut down device | |
212 | * o unlink device data space from the linked list | |
213 | * o delete device entry in the /proc/net/router directory | |
214 | * o decrement module use count | |
215 | * | |
216 | * Return: 0 Ok | |
217 | * <0 error. | |
218 | * Context: process | |
219 | */ | |
220 | ||
221 | ||
222 | int unregister_wan_device(char *name) | |
223 | { | |
224 | struct wan_device *wandev, *prev; | |
225 | ||
226 | if (name == NULL) | |
227 | return -EINVAL; | |
228 | ||
229 | for (wandev = wanrouter_router_devlist, prev = NULL; | |
230 | wandev && strcmp(wandev->name, name); | |
231 | prev = wandev, wandev = wandev->next) | |
232 | ; | |
233 | if (wandev == NULL) | |
234 | return -ENODEV; | |
235 | ||
236 | #ifdef WANDEBUG | |
237 | printk(KERN_INFO "%s: unregistering WAN device %s\n", | |
238 | wanrouter_modname, name); | |
239 | #endif | |
240 | ||
241 | if (wandev->state != WAN_UNCONFIGURED) | |
242 | wanrouter_device_shutdown(wandev); | |
243 | ||
244 | if (prev) | |
245 | prev->next = wandev->next; | |
246 | else | |
247 | wanrouter_router_devlist = wandev->next; | |
248 | ||
249 | wanrouter_proc_delete(wandev); | |
250 | return 0; | |
251 | } | |
252 | ||
97353cb4 AB |
253 | #if 0 |
254 | ||
1da177e4 LT |
255 | /* |
256 | * Encapsulate packet. | |
257 | * | |
258 | * Return: encapsulation header size | |
259 | * < 0 - unsupported Ethertype | |
260 | * | |
261 | * Notes: | |
262 | * 1. This function may be called on interrupt context. | |
263 | */ | |
264 | ||
265 | ||
266 | int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev, | |
267 | unsigned short type) | |
268 | { | |
269 | int hdr_len = 0; | |
270 | ||
271 | switch (type) { | |
272 | case ETH_P_IP: /* IP datagram encapsulation */ | |
273 | hdr_len += 1; | |
274 | skb_push(skb, 1); | |
275 | skb->data[0] = NLPID_IP; | |
276 | break; | |
277 | ||
278 | case ETH_P_IPX: /* SNAP encapsulation */ | |
279 | case ETH_P_ARP: | |
280 | hdr_len += 7; | |
281 | skb_push(skb, 7); | |
282 | skb->data[0] = 0; | |
283 | skb->data[1] = NLPID_SNAP; | |
27d7ff46 ACM |
284 | skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether, |
285 | sizeof(wanrouter_oui_ether)); | |
1da177e4 LT |
286 | *((unsigned short*)&skb->data[5]) = htons(type); |
287 | break; | |
288 | ||
289 | default: /* Unknown packet type */ | |
290 | printk(KERN_INFO | |
291 | "%s: unsupported Ethertype 0x%04X on interface %s!\n", | |
292 | wanrouter_modname, type, dev->name); | |
293 | hdr_len = -EINVAL; | |
294 | } | |
295 | return hdr_len; | |
296 | } | |
297 | ||
298 | ||
299 | /* | |
300 | * Decapsulate packet. | |
301 | * | |
302 | * Return: Ethertype (in network order) | |
303 | * 0 unknown encapsulation | |
304 | * | |
305 | * Notes: | |
306 | * 1. This function may be called on interrupt context. | |
307 | */ | |
308 | ||
309 | ||
ab611487 | 310 | __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
311 | { |
312 | int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */ | |
ab611487 | 313 | __be16 ethertype; |
1da177e4 LT |
314 | |
315 | switch (skb->data[cnt]) { | |
316 | case NLPID_IP: /* IP datagramm */ | |
317 | ethertype = htons(ETH_P_IP); | |
318 | cnt += 1; | |
319 | break; | |
320 | ||
4ba6122b | 321 | case NLPID_SNAP: /* SNAP encapsulation */ |
1da177e4 LT |
322 | if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether, |
323 | sizeof(wanrouter_oui_ether))){ | |
4ba6122b | 324 | printk(KERN_INFO |
1da177e4 LT |
325 | "%s: unsupported SNAP OUI %02X-%02X-%02X " |
326 | "on interface %s!\n", wanrouter_modname, | |
327 | skb->data[cnt+1], skb->data[cnt+2], | |
328 | skb->data[cnt+3], dev->name); | |
329 | return 0; | |
330 | } | |
ab611487 | 331 | ethertype = *((__be16*)&skb->data[cnt+4]); |
1da177e4 LT |
332 | cnt += 6; |
333 | break; | |
334 | ||
335 | /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */ | |
336 | ||
337 | default: | |
338 | printk(KERN_INFO | |
339 | "%s: unsupported NLPID 0x%02X on interface %s!\n", | |
340 | wanrouter_modname, skb->data[cnt], dev->name); | |
341 | return 0; | |
342 | } | |
343 | skb->protocol = ethertype; | |
344 | skb->pkt_type = PACKET_HOST; /* Physically point to point */ | |
345 | skb_pull(skb, cnt); | |
459a98ed | 346 | skb_reset_mac_header(skb); |
1da177e4 LT |
347 | return ethertype; |
348 | } | |
349 | ||
97353cb4 | 350 | #endif /* 0 */ |
1da177e4 LT |
351 | |
352 | /* | |
353 | * WAN device IOCTL. | |
354 | * o find WAN device associated with this node | |
355 | * o execute requested action or pass command to the device driver | |
356 | */ | |
357 | ||
866988ed | 358 | long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 359 | { |
866988ed | 360 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
361 | int err = 0; |
362 | struct proc_dir_entry *dent; | |
363 | struct wan_device *wandev; | |
364 | void __user *data = (void __user *)arg; | |
365 | ||
366 | if (!capable(CAP_NET_ADMIN)) | |
367 | return -EPERM; | |
368 | ||
369 | if ((cmd >> 8) != ROUTER_IOCTL) | |
370 | return -EINVAL; | |
371 | ||
372 | dent = PDE(inode); | |
373 | if ((dent == NULL) || (dent->data == NULL)) | |
374 | return -EINVAL; | |
375 | ||
376 | wandev = dent->data; | |
377 | if (wandev->magic != ROUTER_MAGIC) | |
378 | return -EINVAL; | |
379 | ||
15fd0cd9 | 380 | mutex_lock(&wanrouter_mutex); |
1da177e4 LT |
381 | switch (cmd) { |
382 | case ROUTER_SETUP: | |
383 | err = wanrouter_device_setup(wandev, data); | |
384 | break; | |
385 | ||
386 | case ROUTER_DOWN: | |
387 | err = wanrouter_device_shutdown(wandev); | |
388 | break; | |
389 | ||
390 | case ROUTER_STAT: | |
391 | err = wanrouter_device_stat(wandev, data); | |
392 | break; | |
393 | ||
394 | case ROUTER_IFNEW: | |
395 | err = wanrouter_device_new_if(wandev, data); | |
396 | break; | |
397 | ||
398 | case ROUTER_IFDEL: | |
399 | err = wanrouter_device_del_if(wandev, data); | |
400 | break; | |
401 | ||
402 | case ROUTER_IFSTAT: | |
403 | break; | |
404 | ||
405 | default: | |
406 | if ((cmd >= ROUTER_USER) && | |
407 | (cmd <= ROUTER_USER_MAX) && | |
408 | wandev->ioctl) | |
409 | err = wandev->ioctl(wandev, cmd, arg); | |
410 | else err = -EINVAL; | |
411 | } | |
15fd0cd9 | 412 | mutex_unlock(&wanrouter_mutex); |
1da177e4 LT |
413 | return err; |
414 | } | |
415 | ||
416 | /* | |
417 | * WAN Driver IOCTL Handlers | |
418 | */ | |
419 | ||
420 | /* | |
421 | * Setup WAN link device. | |
422 | * o verify user address space | |
423 | * o allocate kernel memory and copy configuration data to kernel space | |
424 | * o if configuration data includes extension, copy it to kernel space too | |
425 | * o call driver's setup() entry point | |
426 | */ | |
427 | ||
428 | static int wanrouter_device_setup(struct wan_device *wandev, | |
429 | wandev_conf_t __user *u_conf) | |
430 | { | |
431 | void *data = NULL; | |
432 | wandev_conf_t *conf; | |
433 | int err = -EINVAL; | |
434 | ||
435 | if (wandev->setup == NULL) { /* Nothing to do ? */ | |
436 | printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n", | |
437 | wandev->name); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL); | |
442 | if (conf == NULL){ | |
443 | printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n", | |
444 | wandev->name); | |
445 | return -ENOBUFS; | |
446 | } | |
447 | ||
448 | if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) { | |
449 | printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n", | |
450 | wandev->name); | |
451 | kfree(conf); | |
452 | return -EFAULT; | |
453 | } | |
454 | ||
455 | if (conf->magic != ROUTER_MAGIC) { | |
456 | kfree(conf); | |
457 | printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n", | |
458 | wandev->name); | |
4ba6122b | 459 | return -EINVAL; |
1da177e4 LT |
460 | } |
461 | ||
462 | if (conf->data_size && conf->data) { | |
75202e76 | 463 | if (conf->data_size > 128000) { |
1da177e4 LT |
464 | printk(KERN_INFO |
465 | "%s: ERROR, Invalid firmware data size %i !\n", | |
466 | wandev->name, conf->data_size); | |
467 | kfree(conf); | |
4ba6122b | 468 | return -EINVAL; |
1da177e4 LT |
469 | } |
470 | ||
471 | data = vmalloc(conf->data_size); | |
472 | if (!data) { | |
473 | printk(KERN_INFO | |
4ba6122b | 474 | "%s: ERROR, Faild allocate kernel memory !\n", |
1da177e4 LT |
475 | wandev->name); |
476 | kfree(conf); | |
477 | return -ENOBUFS; | |
478 | } | |
479 | if (!copy_from_user(data, conf->data, conf->data_size)) { | |
480 | conf->data = data; | |
481 | err = wandev->setup(wandev, conf); | |
482 | } else { | |
483 | printk(KERN_INFO | |
484 | "%s: ERROR, Faild to copy from user data !\n", | |
485 | wandev->name); | |
486 | err = -EFAULT; | |
487 | } | |
488 | vfree(data); | |
489 | } else { | |
490 | printk(KERN_INFO | |
491 | "%s: ERROR, No firmware found ! Firmware size = %i !\n", | |
492 | wandev->name, conf->data_size); | |
493 | } | |
494 | ||
495 | kfree(conf); | |
496 | return err; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Shutdown WAN device. | |
501 | * o delete all not opened logical channels for this device | |
502 | * o call driver's shutdown() entry point | |
503 | */ | |
504 | ||
505 | static int wanrouter_device_shutdown(struct wan_device *wandev) | |
506 | { | |
507 | struct net_device *dev; | |
508 | int err=0; | |
509 | ||
510 | if (wandev->state == WAN_UNCONFIGURED) | |
511 | return 0; | |
512 | ||
513 | printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name); | |
514 | ||
515 | for (dev = wandev->dev; dev;) { | |
516 | err = wanrouter_delete_interface(wandev, dev->name); | |
517 | if (err) | |
518 | return err; | |
519 | /* The above function deallocates the current dev | |
7be6065b | 520 | * structure. Therefore, we cannot use netdev_priv(dev) |
1da177e4 LT |
521 | * as the next element: wandev->dev points to the |
522 | * next element */ | |
523 | dev = wandev->dev; | |
524 | } | |
525 | ||
526 | if (wandev->ndev) | |
527 | return -EBUSY; /* there are opened interfaces */ | |
528 | ||
529 | if (wandev->shutdown) | |
530 | err=wandev->shutdown(wandev); | |
531 | ||
532 | return err; | |
533 | } | |
534 | ||
535 | /* | |
536 | * Get WAN device status & statistics. | |
537 | */ | |
538 | ||
539 | static int wanrouter_device_stat(struct wan_device *wandev, | |
540 | wandev_stat_t __user *u_stat) | |
541 | { | |
542 | wandev_stat_t stat; | |
543 | ||
544 | memset(&stat, 0, sizeof(stat)); | |
545 | ||
546 | /* Ask device driver to update device statistics */ | |
547 | if ((wandev->state != WAN_UNCONFIGURED) && wandev->update) | |
548 | wandev->update(wandev); | |
549 | ||
550 | /* Fill out structure */ | |
551 | stat.ndev = wandev->ndev; | |
552 | stat.state = wandev->state; | |
553 | ||
554 | if (copy_to_user(u_stat, &stat, sizeof(stat))) | |
555 | return -EFAULT; | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Create new WAN interface. | |
562 | * o verify user address space | |
563 | * o copy configuration data to kernel address space | |
564 | * o allocate network interface data space | |
565 | * o call driver's new_if() entry point | |
566 | * o make sure there is no interface name conflict | |
567 | * o register network interface | |
568 | */ | |
569 | ||
570 | static int wanrouter_device_new_if(struct wan_device *wandev, | |
571 | wanif_conf_t __user *u_conf) | |
572 | { | |
573 | wanif_conf_t *cnf; | |
574 | struct net_device *dev = NULL; | |
1da177e4 LT |
575 | int err; |
576 | ||
577 | if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL)) | |
578 | return -ENODEV; | |
579 | ||
580 | cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL); | |
581 | if (!cnf) | |
582 | return -ENOBUFS; | |
583 | ||
584 | err = -EFAULT; | |
585 | if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t))) | |
586 | goto out; | |
587 | ||
588 | err = -EINVAL; | |
589 | if (cnf->magic != ROUTER_MAGIC) | |
590 | goto out; | |
591 | ||
592 | if (cnf->config_id == WANCONFIG_MPPP) { | |
1da177e4 LT |
593 | printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n", |
594 | wandev->name); | |
595 | err = -EPROTONOSUPPORT; | |
596 | goto out; | |
1da177e4 | 597 | } else { |
1da177e4 LT |
598 | err = wandev->new_if(wandev, dev, cnf); |
599 | } | |
600 | ||
601 | if (!err) { | |
602 | /* Register network interface. This will invoke init() | |
603 | * function supplied by the driver. If device registered | |
604 | * successfully, add it to the interface list. | |
605 | */ | |
606 | ||
607 | if (dev->name == NULL) { | |
608 | err = -EINVAL; | |
609 | } else { | |
610 | ||
611 | #ifdef WANDEBUG | |
612 | printk(KERN_INFO "%s: registering interface %s...\n", | |
613 | wanrouter_modname, dev->name); | |
614 | #endif | |
615 | ||
616 | err = register_netdev(dev); | |
617 | if (!err) { | |
618 | struct net_device *slave = NULL; | |
619 | unsigned long smp_flags=0; | |
620 | ||
621 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
622 | ||
623 | if (wandev->dev == NULL) { | |
624 | wandev->dev = dev; | |
625 | } else { | |
626 | for (slave=wandev->dev; | |
7be6065b WC |
627 | DEV_TO_SLAVE(slave); |
628 | slave = DEV_TO_SLAVE(slave)) | |
629 | DEV_TO_SLAVE(slave) = dev; | |
1da177e4 LT |
630 | } |
631 | ++wandev->ndev; | |
632 | ||
633 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
634 | err = 0; /* done !!! */ | |
635 | goto out; | |
636 | } | |
637 | } | |
638 | if (wandev->del_if) | |
639 | wandev->del_if(wandev, dev); | |
7be6065b | 640 | free_netdev(dev); |
1da177e4 LT |
641 | } |
642 | ||
1da177e4 LT |
643 | out: |
644 | kfree(cnf); | |
645 | return err; | |
646 | } | |
647 | ||
648 | ||
649 | /* | |
650 | * Delete WAN logical channel. | |
651 | * o verify user address space | |
652 | * o copy configuration data to kernel address space | |
653 | */ | |
654 | ||
655 | static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name) | |
656 | { | |
657 | char name[WAN_IFNAME_SZ + 1]; | |
4ba6122b | 658 | int err = 0; |
1da177e4 LT |
659 | |
660 | if (wandev->state == WAN_UNCONFIGURED) | |
661 | return -ENODEV; | |
662 | ||
663 | memset(name, 0, sizeof(name)); | |
664 | ||
665 | if (copy_from_user(name, u_name, WAN_IFNAME_SZ)) | |
666 | return -EFAULT; | |
667 | ||
668 | err = wanrouter_delete_interface(wandev, name); | |
669 | if (err) | |
670 | return err; | |
671 | ||
672 | /* If last interface being deleted, shutdown card | |
673 | * This helps with administration at leaf nodes | |
674 | * (You can tell if the person at the other end of the phone | |
675 | * has an interface configured) and avoids DoS vulnerabilities | |
676 | * in binary driver files - this fixes a problem with the current | |
677 | * Sangoma driver going into strange states when all the network | |
678 | * interfaces are deleted and the link irrecoverably disconnected. | |
679 | */ | |
680 | ||
4ba6122b YH |
681 | if (!wandev->ndev && wandev->shutdown) |
682 | err = wandev->shutdown(wandev); | |
1da177e4 LT |
683 | |
684 | return err; | |
685 | } | |
686 | ||
687 | /* | |
688 | * Miscellaneous Functions | |
689 | */ | |
690 | ||
691 | /* | |
692 | * Find WAN device by name. | |
693 | * Return pointer to the WAN device data space or NULL if device not found. | |
694 | */ | |
695 | ||
696 | static struct wan_device *wanrouter_find_device(char *name) | |
697 | { | |
698 | struct wan_device *wandev; | |
699 | ||
700 | for (wandev = wanrouter_router_devlist; | |
701 | wandev && strcmp(wandev->name, name); | |
702 | wandev = wandev->next); | |
703 | return wandev; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Delete WAN logical channel identified by its name. | |
708 | * o find logical channel by its name | |
709 | * o call driver's del_if() entry point | |
710 | * o unregister network interface | |
711 | * o unlink channel data space from linked list of channels | |
712 | * o release channel data space | |
713 | * | |
714 | * Return: 0 success | |
715 | * -ENODEV channel not found. | |
716 | * -EBUSY interface is open | |
717 | * | |
718 | * Note: If (force != 0), then device will be destroyed even if interface | |
719 | * associated with it is open. It's caller's responsibility to make | |
720 | * sure that opened interfaces are not removed! | |
721 | */ | |
722 | ||
723 | static int wanrouter_delete_interface(struct wan_device *wandev, char *name) | |
724 | { | |
725 | struct net_device *dev = NULL, *prev = NULL; | |
726 | unsigned long smp_flags=0; | |
727 | ||
728 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
729 | dev = wandev->dev; | |
730 | prev = NULL; | |
731 | while (dev && strcmp(name, dev->name)) { | |
7be6065b | 732 | struct net_device **slave = netdev_priv(dev); |
1da177e4 LT |
733 | prev = dev; |
734 | dev = *slave; | |
735 | } | |
736 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
737 | ||
738 | if (dev == NULL) | |
739 | return -ENODEV; /* interface not found */ | |
740 | ||
741 | if (netif_running(dev)) | |
742 | return -EBUSY; /* interface in use */ | |
743 | ||
744 | if (wandev->del_if) | |
745 | wandev->del_if(wandev, dev); | |
746 | ||
747 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
748 | if (prev) { | |
7be6065b WC |
749 | struct net_device **prev_slave = netdev_priv(prev); |
750 | struct net_device **slave = netdev_priv(dev); | |
1da177e4 LT |
751 | |
752 | *prev_slave = *slave; | |
753 | } else { | |
7be6065b | 754 | struct net_device **slave = netdev_priv(dev); |
1da177e4 LT |
755 | wandev->dev = *slave; |
756 | } | |
757 | --wandev->ndev; | |
758 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
759 | ||
760 | printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name); | |
761 | ||
1da177e4 LT |
762 | unregister_netdev(dev); |
763 | ||
764 | free_netdev(dev); | |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
97353cb4 | 769 | static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
9ee62630 | 770 | __acquires(lock) |
1da177e4 | 771 | { |
4ba6122b | 772 | spin_lock_irqsave(lock, *smp_flags); |
1da177e4 LT |
773 | } |
774 | ||
775 | ||
97353cb4 | 776 | static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
9ee62630 | 777 | __releases(lock) |
1da177e4 LT |
778 | { |
779 | spin_unlock_irqrestore(lock, *smp_flags); | |
780 | } | |
781 | ||
782 | EXPORT_SYMBOL(register_wan_device); | |
783 | EXPORT_SYMBOL(unregister_wan_device); | |
1da177e4 LT |
784 | |
785 | MODULE_LICENSE("GPL"); | |
786 | ||
787 | /* | |
788 | * End | |
789 | */ |