Commit | Line | Data |
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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() */ |
405f5571 | 51 | #include <linux/smp_lock.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 | ||
74 | static int wanrouter_device_setup(struct wan_device *wandev, | |
75 | wandev_conf_t __user *u_conf); | |
76 | static int wanrouter_device_stat(struct wan_device *wandev, | |
77 | wandev_stat_t __user *u_stat); | |
78 | static int wanrouter_device_shutdown(struct wan_device *wandev); | |
79 | static int wanrouter_device_new_if(struct wan_device *wandev, | |
80 | wanif_conf_t __user *u_conf); | |
81 | static int wanrouter_device_del_if(struct wan_device *wandev, | |
82 | char __user *u_name); | |
83 | ||
84 | /* | |
85 | * Miscellaneous | |
86 | */ | |
87 | ||
88 | static struct wan_device *wanrouter_find_device(char *name); | |
89 | static int wanrouter_delete_interface(struct wan_device *wandev, char *name); | |
9ee62630 HE |
90 | static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
91 | __acquires(lock); | |
92 | static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) | |
93 | __releases(lock); | |
1da177e4 LT |
94 | |
95 | ||
96 | ||
97 | /* | |
98 | * Global Data | |
99 | */ | |
100 | ||
101 | static char wanrouter_fullname[] = "Sangoma WANPIPE Router"; | |
102 | static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc."; | |
103 | static char wanrouter_modname[] = ROUTER_NAME; /* short module name */ | |
104 | struct wan_device* wanrouter_router_devlist; /* list of registered devices */ | |
105 | ||
106 | /* | |
107 | * Organize Unique Identifiers for encapsulation/decapsulation | |
108 | */ | |
109 | ||
1da177e4 | 110 | #if 0 |
97353cb4 | 111 | static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 }; |
1da177e4 LT |
112 | static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 }; |
113 | #endif | |
114 | ||
115 | static int __init wanrouter_init(void) | |
116 | { | |
117 | int err; | |
118 | ||
119 | printk(KERN_INFO "%s v%u.%u %s\n", | |
120 | wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE, | |
121 | wanrouter_copyright); | |
122 | ||
123 | err = wanrouter_proc_init(); | |
124 | if (err) | |
125 | printk(KERN_INFO "%s: can't create entry in proc filesystem!\n", | |
126 | wanrouter_modname); | |
127 | ||
128 | return err; | |
129 | } | |
130 | ||
131 | static void __exit wanrouter_cleanup (void) | |
132 | { | |
133 | wanrouter_proc_cleanup(); | |
134 | } | |
135 | ||
136 | /* | |
137 | * This is just plain dumb. We should move the bugger to drivers/net/wan, | |
138 | * slap it first in directory and make it module_init(). The only reason | |
139 | * for subsys_initcall() here is that net goes after drivers (why, BTW?) | |
140 | */ | |
141 | subsys_initcall(wanrouter_init); | |
142 | module_exit(wanrouter_cleanup); | |
143 | ||
144 | /* | |
145 | * Kernel APIs | |
146 | */ | |
147 | ||
148 | /* | |
149 | * Register WAN device. | |
150 | * o verify device credentials | |
151 | * o create an entry for the device in the /proc/net/router directory | |
152 | * o initialize internally maintained fields of the wan_device structure | |
153 | * o link device data space to a singly-linked list | |
154 | * o if it's the first device, then start kernel 'thread' | |
155 | * o increment module use count | |
156 | * | |
157 | * Return: | |
158 | * 0 Ok | |
159 | * < 0 error. | |
160 | * | |
161 | * Context: process | |
162 | */ | |
163 | ||
164 | ||
165 | int register_wan_device(struct wan_device *wandev) | |
166 | { | |
167 | int err, namelen; | |
168 | ||
169 | if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) || | |
170 | (wandev->name == NULL)) | |
171 | return -EINVAL; | |
172 | ||
173 | namelen = strlen(wandev->name); | |
174 | if (!namelen || (namelen > WAN_DRVNAME_SZ)) | |
175 | return -EINVAL; | |
176 | ||
177 | if (wanrouter_find_device(wandev->name)) | |
178 | return -EEXIST; | |
179 | ||
180 | #ifdef WANDEBUG | |
181 | printk(KERN_INFO "%s: registering WAN device %s\n", | |
182 | wanrouter_modname, wandev->name); | |
183 | #endif | |
184 | ||
185 | /* | |
186 | * Register /proc directory entry | |
187 | */ | |
188 | err = wanrouter_proc_add(wandev); | |
189 | if (err) { | |
190 | printk(KERN_INFO | |
191 | "%s: can't create /proc/net/router/%s entry!\n", | |
192 | wanrouter_modname, wandev->name); | |
193 | return err; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Initialize fields of the wan_device structure maintained by the | |
198 | * router and update local data. | |
199 | */ | |
200 | ||
201 | wandev->ndev = 0; | |
202 | wandev->dev = NULL; | |
203 | wandev->next = wanrouter_router_devlist; | |
204 | wanrouter_router_devlist = wandev; | |
205 | return 0; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Unregister WAN device. | |
210 | * o shut down device | |
211 | * o unlink device data space from the linked list | |
212 | * o delete device entry in the /proc/net/router directory | |
213 | * o decrement module use count | |
214 | * | |
215 | * Return: 0 Ok | |
216 | * <0 error. | |
217 | * Context: process | |
218 | */ | |
219 | ||
220 | ||
221 | int unregister_wan_device(char *name) | |
222 | { | |
223 | struct wan_device *wandev, *prev; | |
224 | ||
225 | if (name == NULL) | |
226 | return -EINVAL; | |
227 | ||
228 | for (wandev = wanrouter_router_devlist, prev = NULL; | |
229 | wandev && strcmp(wandev->name, name); | |
230 | prev = wandev, wandev = wandev->next) | |
231 | ; | |
232 | if (wandev == NULL) | |
233 | return -ENODEV; | |
234 | ||
235 | #ifdef WANDEBUG | |
236 | printk(KERN_INFO "%s: unregistering WAN device %s\n", | |
237 | wanrouter_modname, name); | |
238 | #endif | |
239 | ||
240 | if (wandev->state != WAN_UNCONFIGURED) | |
241 | wanrouter_device_shutdown(wandev); | |
242 | ||
243 | if (prev) | |
244 | prev->next = wandev->next; | |
245 | else | |
246 | wanrouter_router_devlist = wandev->next; | |
247 | ||
248 | wanrouter_proc_delete(wandev); | |
249 | return 0; | |
250 | } | |
251 | ||
97353cb4 AB |
252 | #if 0 |
253 | ||
1da177e4 LT |
254 | /* |
255 | * Encapsulate packet. | |
256 | * | |
257 | * Return: encapsulation header size | |
258 | * < 0 - unsupported Ethertype | |
259 | * | |
260 | * Notes: | |
261 | * 1. This function may be called on interrupt context. | |
262 | */ | |
263 | ||
264 | ||
265 | int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev, | |
266 | unsigned short type) | |
267 | { | |
268 | int hdr_len = 0; | |
269 | ||
270 | switch (type) { | |
271 | case ETH_P_IP: /* IP datagram encapsulation */ | |
272 | hdr_len += 1; | |
273 | skb_push(skb, 1); | |
274 | skb->data[0] = NLPID_IP; | |
275 | break; | |
276 | ||
277 | case ETH_P_IPX: /* SNAP encapsulation */ | |
278 | case ETH_P_ARP: | |
279 | hdr_len += 7; | |
280 | skb_push(skb, 7); | |
281 | skb->data[0] = 0; | |
282 | skb->data[1] = NLPID_SNAP; | |
27d7ff46 ACM |
283 | skb_copy_to_linear_data_offset(skb, 2, wanrouter_oui_ether, |
284 | sizeof(wanrouter_oui_ether)); | |
1da177e4 LT |
285 | *((unsigned short*)&skb->data[5]) = htons(type); |
286 | break; | |
287 | ||
288 | default: /* Unknown packet type */ | |
289 | printk(KERN_INFO | |
290 | "%s: unsupported Ethertype 0x%04X on interface %s!\n", | |
291 | wanrouter_modname, type, dev->name); | |
292 | hdr_len = -EINVAL; | |
293 | } | |
294 | return hdr_len; | |
295 | } | |
296 | ||
297 | ||
298 | /* | |
299 | * Decapsulate packet. | |
300 | * | |
301 | * Return: Ethertype (in network order) | |
302 | * 0 unknown encapsulation | |
303 | * | |
304 | * Notes: | |
305 | * 1. This function may be called on interrupt context. | |
306 | */ | |
307 | ||
308 | ||
ab611487 | 309 | __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
310 | { |
311 | int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */ | |
ab611487 | 312 | __be16 ethertype; |
1da177e4 LT |
313 | |
314 | switch (skb->data[cnt]) { | |
315 | case NLPID_IP: /* IP datagramm */ | |
316 | ethertype = htons(ETH_P_IP); | |
317 | cnt += 1; | |
318 | break; | |
319 | ||
4ba6122b | 320 | case NLPID_SNAP: /* SNAP encapsulation */ |
1da177e4 LT |
321 | if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether, |
322 | sizeof(wanrouter_oui_ether))){ | |
4ba6122b | 323 | printk(KERN_INFO |
1da177e4 LT |
324 | "%s: unsupported SNAP OUI %02X-%02X-%02X " |
325 | "on interface %s!\n", wanrouter_modname, | |
326 | skb->data[cnt+1], skb->data[cnt+2], | |
327 | skb->data[cnt+3], dev->name); | |
328 | return 0; | |
329 | } | |
ab611487 | 330 | ethertype = *((__be16*)&skb->data[cnt+4]); |
1da177e4 LT |
331 | cnt += 6; |
332 | break; | |
333 | ||
334 | /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */ | |
335 | ||
336 | default: | |
337 | printk(KERN_INFO | |
338 | "%s: unsupported NLPID 0x%02X on interface %s!\n", | |
339 | wanrouter_modname, skb->data[cnt], dev->name); | |
340 | return 0; | |
341 | } | |
342 | skb->protocol = ethertype; | |
343 | skb->pkt_type = PACKET_HOST; /* Physically point to point */ | |
344 | skb_pull(skb, cnt); | |
459a98ed | 345 | skb_reset_mac_header(skb); |
1da177e4 LT |
346 | return ethertype; |
347 | } | |
348 | ||
97353cb4 | 349 | #endif /* 0 */ |
1da177e4 LT |
350 | |
351 | /* | |
352 | * WAN device IOCTL. | |
353 | * o find WAN device associated with this node | |
354 | * o execute requested action or pass command to the device driver | |
355 | */ | |
356 | ||
866988ed | 357 | long wanrouter_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4 | 358 | { |
866988ed | 359 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
360 | int err = 0; |
361 | struct proc_dir_entry *dent; | |
362 | struct wan_device *wandev; | |
363 | void __user *data = (void __user *)arg; | |
364 | ||
365 | if (!capable(CAP_NET_ADMIN)) | |
366 | return -EPERM; | |
367 | ||
368 | if ((cmd >> 8) != ROUTER_IOCTL) | |
369 | return -EINVAL; | |
370 | ||
371 | dent = PDE(inode); | |
372 | if ((dent == NULL) || (dent->data == NULL)) | |
373 | return -EINVAL; | |
374 | ||
375 | wandev = dent->data; | |
376 | if (wandev->magic != ROUTER_MAGIC) | |
377 | return -EINVAL; | |
378 | ||
866988ed | 379 | lock_kernel(); |
1da177e4 LT |
380 | switch (cmd) { |
381 | case ROUTER_SETUP: | |
382 | err = wanrouter_device_setup(wandev, data); | |
383 | break; | |
384 | ||
385 | case ROUTER_DOWN: | |
386 | err = wanrouter_device_shutdown(wandev); | |
387 | break; | |
388 | ||
389 | case ROUTER_STAT: | |
390 | err = wanrouter_device_stat(wandev, data); | |
391 | break; | |
392 | ||
393 | case ROUTER_IFNEW: | |
394 | err = wanrouter_device_new_if(wandev, data); | |
395 | break; | |
396 | ||
397 | case ROUTER_IFDEL: | |
398 | err = wanrouter_device_del_if(wandev, data); | |
399 | break; | |
400 | ||
401 | case ROUTER_IFSTAT: | |
402 | break; | |
403 | ||
404 | default: | |
405 | if ((cmd >= ROUTER_USER) && | |
406 | (cmd <= ROUTER_USER_MAX) && | |
407 | wandev->ioctl) | |
408 | err = wandev->ioctl(wandev, cmd, arg); | |
409 | else err = -EINVAL; | |
410 | } | |
866988ed | 411 | unlock_kernel(); |
1da177e4 LT |
412 | return err; |
413 | } | |
414 | ||
415 | /* | |
416 | * WAN Driver IOCTL Handlers | |
417 | */ | |
418 | ||
419 | /* | |
420 | * Setup WAN link device. | |
421 | * o verify user address space | |
422 | * o allocate kernel memory and copy configuration data to kernel space | |
423 | * o if configuration data includes extension, copy it to kernel space too | |
424 | * o call driver's setup() entry point | |
425 | */ | |
426 | ||
427 | static int wanrouter_device_setup(struct wan_device *wandev, | |
428 | wandev_conf_t __user *u_conf) | |
429 | { | |
430 | void *data = NULL; | |
431 | wandev_conf_t *conf; | |
432 | int err = -EINVAL; | |
433 | ||
434 | if (wandev->setup == NULL) { /* Nothing to do ? */ | |
435 | printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n", | |
436 | wandev->name); | |
437 | return 0; | |
438 | } | |
439 | ||
440 | conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL); | |
441 | if (conf == NULL){ | |
442 | printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n", | |
443 | wandev->name); | |
444 | return -ENOBUFS; | |
445 | } | |
446 | ||
447 | if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) { | |
448 | printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n", | |
449 | wandev->name); | |
450 | kfree(conf); | |
451 | return -EFAULT; | |
452 | } | |
453 | ||
454 | if (conf->magic != ROUTER_MAGIC) { | |
455 | kfree(conf); | |
456 | printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n", | |
457 | wandev->name); | |
4ba6122b | 458 | return -EINVAL; |
1da177e4 LT |
459 | } |
460 | ||
461 | if (conf->data_size && conf->data) { | |
75202e76 | 462 | if (conf->data_size > 128000) { |
1da177e4 LT |
463 | printk(KERN_INFO |
464 | "%s: ERROR, Invalid firmware data size %i !\n", | |
465 | wandev->name, conf->data_size); | |
466 | kfree(conf); | |
4ba6122b | 467 | return -EINVAL; |
1da177e4 LT |
468 | } |
469 | ||
470 | data = vmalloc(conf->data_size); | |
471 | if (!data) { | |
472 | printk(KERN_INFO | |
4ba6122b | 473 | "%s: ERROR, Faild allocate kernel memory !\n", |
1da177e4 LT |
474 | wandev->name); |
475 | kfree(conf); | |
476 | return -ENOBUFS; | |
477 | } | |
478 | if (!copy_from_user(data, conf->data, conf->data_size)) { | |
479 | conf->data = data; | |
480 | err = wandev->setup(wandev, conf); | |
481 | } else { | |
482 | printk(KERN_INFO | |
483 | "%s: ERROR, Faild to copy from user data !\n", | |
484 | wandev->name); | |
485 | err = -EFAULT; | |
486 | } | |
487 | vfree(data); | |
488 | } else { | |
489 | printk(KERN_INFO | |
490 | "%s: ERROR, No firmware found ! Firmware size = %i !\n", | |
491 | wandev->name, conf->data_size); | |
492 | } | |
493 | ||
494 | kfree(conf); | |
495 | return err; | |
496 | } | |
497 | ||
498 | /* | |
499 | * Shutdown WAN device. | |
500 | * o delete all not opened logical channels for this device | |
501 | * o call driver's shutdown() entry point | |
502 | */ | |
503 | ||
504 | static int wanrouter_device_shutdown(struct wan_device *wandev) | |
505 | { | |
506 | struct net_device *dev; | |
507 | int err=0; | |
508 | ||
509 | if (wandev->state == WAN_UNCONFIGURED) | |
510 | return 0; | |
511 | ||
512 | printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name); | |
513 | ||
514 | for (dev = wandev->dev; dev;) { | |
515 | err = wanrouter_delete_interface(wandev, dev->name); | |
516 | if (err) | |
517 | return err; | |
518 | /* The above function deallocates the current dev | |
7be6065b | 519 | * structure. Therefore, we cannot use netdev_priv(dev) |
1da177e4 LT |
520 | * as the next element: wandev->dev points to the |
521 | * next element */ | |
522 | dev = wandev->dev; | |
523 | } | |
524 | ||
525 | if (wandev->ndev) | |
526 | return -EBUSY; /* there are opened interfaces */ | |
527 | ||
528 | if (wandev->shutdown) | |
529 | err=wandev->shutdown(wandev); | |
530 | ||
531 | return err; | |
532 | } | |
533 | ||
534 | /* | |
535 | * Get WAN device status & statistics. | |
536 | */ | |
537 | ||
538 | static int wanrouter_device_stat(struct wan_device *wandev, | |
539 | wandev_stat_t __user *u_stat) | |
540 | { | |
541 | wandev_stat_t stat; | |
542 | ||
543 | memset(&stat, 0, sizeof(stat)); | |
544 | ||
545 | /* Ask device driver to update device statistics */ | |
546 | if ((wandev->state != WAN_UNCONFIGURED) && wandev->update) | |
547 | wandev->update(wandev); | |
548 | ||
549 | /* Fill out structure */ | |
550 | stat.ndev = wandev->ndev; | |
551 | stat.state = wandev->state; | |
552 | ||
553 | if (copy_to_user(u_stat, &stat, sizeof(stat))) | |
554 | return -EFAULT; | |
555 | ||
556 | return 0; | |
557 | } | |
558 | ||
559 | /* | |
560 | * Create new WAN interface. | |
561 | * o verify user address space | |
562 | * o copy configuration data to kernel address space | |
563 | * o allocate network interface data space | |
564 | * o call driver's new_if() entry point | |
565 | * o make sure there is no interface name conflict | |
566 | * o register network interface | |
567 | */ | |
568 | ||
569 | static int wanrouter_device_new_if(struct wan_device *wandev, | |
570 | wanif_conf_t __user *u_conf) | |
571 | { | |
572 | wanif_conf_t *cnf; | |
573 | struct net_device *dev = NULL; | |
1da177e4 LT |
574 | int err; |
575 | ||
576 | if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL)) | |
577 | return -ENODEV; | |
578 | ||
579 | cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL); | |
580 | if (!cnf) | |
581 | return -ENOBUFS; | |
582 | ||
583 | err = -EFAULT; | |
584 | if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t))) | |
585 | goto out; | |
586 | ||
587 | err = -EINVAL; | |
588 | if (cnf->magic != ROUTER_MAGIC) | |
589 | goto out; | |
590 | ||
591 | if (cnf->config_id == WANCONFIG_MPPP) { | |
1da177e4 LT |
592 | printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n", |
593 | wandev->name); | |
594 | err = -EPROTONOSUPPORT; | |
595 | goto out; | |
1da177e4 | 596 | } else { |
1da177e4 LT |
597 | err = wandev->new_if(wandev, dev, cnf); |
598 | } | |
599 | ||
600 | if (!err) { | |
601 | /* Register network interface. This will invoke init() | |
602 | * function supplied by the driver. If device registered | |
603 | * successfully, add it to the interface list. | |
604 | */ | |
605 | ||
606 | if (dev->name == NULL) { | |
607 | err = -EINVAL; | |
608 | } else { | |
609 | ||
610 | #ifdef WANDEBUG | |
611 | printk(KERN_INFO "%s: registering interface %s...\n", | |
612 | wanrouter_modname, dev->name); | |
613 | #endif | |
614 | ||
615 | err = register_netdev(dev); | |
616 | if (!err) { | |
617 | struct net_device *slave = NULL; | |
618 | unsigned long smp_flags=0; | |
619 | ||
620 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
621 | ||
622 | if (wandev->dev == NULL) { | |
623 | wandev->dev = dev; | |
624 | } else { | |
625 | for (slave=wandev->dev; | |
7be6065b WC |
626 | DEV_TO_SLAVE(slave); |
627 | slave = DEV_TO_SLAVE(slave)) | |
628 | DEV_TO_SLAVE(slave) = dev; | |
1da177e4 LT |
629 | } |
630 | ++wandev->ndev; | |
631 | ||
632 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
633 | err = 0; /* done !!! */ | |
634 | goto out; | |
635 | } | |
636 | } | |
637 | if (wandev->del_if) | |
638 | wandev->del_if(wandev, dev); | |
7be6065b | 639 | free_netdev(dev); |
1da177e4 LT |
640 | } |
641 | ||
1da177e4 LT |
642 | out: |
643 | kfree(cnf); | |
644 | return err; | |
645 | } | |
646 | ||
647 | ||
648 | /* | |
649 | * Delete WAN logical channel. | |
650 | * o verify user address space | |
651 | * o copy configuration data to kernel address space | |
652 | */ | |
653 | ||
654 | static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name) | |
655 | { | |
656 | char name[WAN_IFNAME_SZ + 1]; | |
4ba6122b | 657 | int err = 0; |
1da177e4 LT |
658 | |
659 | if (wandev->state == WAN_UNCONFIGURED) | |
660 | return -ENODEV; | |
661 | ||
662 | memset(name, 0, sizeof(name)); | |
663 | ||
664 | if (copy_from_user(name, u_name, WAN_IFNAME_SZ)) | |
665 | return -EFAULT; | |
666 | ||
667 | err = wanrouter_delete_interface(wandev, name); | |
668 | if (err) | |
669 | return err; | |
670 | ||
671 | /* If last interface being deleted, shutdown card | |
672 | * This helps with administration at leaf nodes | |
673 | * (You can tell if the person at the other end of the phone | |
674 | * has an interface configured) and avoids DoS vulnerabilities | |
675 | * in binary driver files - this fixes a problem with the current | |
676 | * Sangoma driver going into strange states when all the network | |
677 | * interfaces are deleted and the link irrecoverably disconnected. | |
678 | */ | |
679 | ||
4ba6122b YH |
680 | if (!wandev->ndev && wandev->shutdown) |
681 | err = wandev->shutdown(wandev); | |
1da177e4 LT |
682 | |
683 | return err; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Miscellaneous Functions | |
688 | */ | |
689 | ||
690 | /* | |
691 | * Find WAN device by name. | |
692 | * Return pointer to the WAN device data space or NULL if device not found. | |
693 | */ | |
694 | ||
695 | static struct wan_device *wanrouter_find_device(char *name) | |
696 | { | |
697 | struct wan_device *wandev; | |
698 | ||
699 | for (wandev = wanrouter_router_devlist; | |
700 | wandev && strcmp(wandev->name, name); | |
701 | wandev = wandev->next); | |
702 | return wandev; | |
703 | } | |
704 | ||
705 | /* | |
706 | * Delete WAN logical channel identified by its name. | |
707 | * o find logical channel by its name | |
708 | * o call driver's del_if() entry point | |
709 | * o unregister network interface | |
710 | * o unlink channel data space from linked list of channels | |
711 | * o release channel data space | |
712 | * | |
713 | * Return: 0 success | |
714 | * -ENODEV channel not found. | |
715 | * -EBUSY interface is open | |
716 | * | |
717 | * Note: If (force != 0), then device will be destroyed even if interface | |
718 | * associated with it is open. It's caller's responsibility to make | |
719 | * sure that opened interfaces are not removed! | |
720 | */ | |
721 | ||
722 | static int wanrouter_delete_interface(struct wan_device *wandev, char *name) | |
723 | { | |
724 | struct net_device *dev = NULL, *prev = NULL; | |
725 | unsigned long smp_flags=0; | |
726 | ||
727 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
728 | dev = wandev->dev; | |
729 | prev = NULL; | |
730 | while (dev && strcmp(name, dev->name)) { | |
7be6065b | 731 | struct net_device **slave = netdev_priv(dev); |
1da177e4 LT |
732 | prev = dev; |
733 | dev = *slave; | |
734 | } | |
735 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
736 | ||
737 | if (dev == NULL) | |
738 | return -ENODEV; /* interface not found */ | |
739 | ||
740 | if (netif_running(dev)) | |
741 | return -EBUSY; /* interface in use */ | |
742 | ||
743 | if (wandev->del_if) | |
744 | wandev->del_if(wandev, dev); | |
745 | ||
746 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
747 | if (prev) { | |
7be6065b WC |
748 | struct net_device **prev_slave = netdev_priv(prev); |
749 | struct net_device **slave = netdev_priv(dev); | |
1da177e4 LT |
750 | |
751 | *prev_slave = *slave; | |
752 | } else { | |
7be6065b | 753 | struct net_device **slave = netdev_priv(dev); |
1da177e4 LT |
754 | wandev->dev = *slave; |
755 | } | |
756 | --wandev->ndev; | |
757 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
758 | ||
759 | printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name); | |
760 | ||
1da177e4 LT |
761 | unregister_netdev(dev); |
762 | ||
763 | free_netdev(dev); | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
97353cb4 | 768 | static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
9ee62630 | 769 | __acquires(lock) |
1da177e4 | 770 | { |
4ba6122b | 771 | spin_lock_irqsave(lock, *smp_flags); |
1da177e4 LT |
772 | } |
773 | ||
774 | ||
97353cb4 | 775 | static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
9ee62630 | 776 | __releases(lock) |
1da177e4 LT |
777 | { |
778 | spin_unlock_irqrestore(lock, *smp_flags); | |
779 | } | |
780 | ||
781 | EXPORT_SYMBOL(register_wan_device); | |
782 | EXPORT_SYMBOL(unregister_wan_device); | |
1da177e4 LT |
783 | |
784 | MODULE_LICENSE("GPL"); | |
785 | ||
786 | /* | |
787 | * End | |
788 | */ |