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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> | |
49 | #include <linux/init.h> | |
50 | #include <linux/module.h> /* support for loadable modules */ | |
e49332bd JJ |
51 | #include <linux/slab.h> /* kmalloc(), kfree() */ |
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. */ | |
61 | #include <net/syncppp.h> | |
62 | ||
63 | #define KMEM_SAFETYZONE 8 | |
64 | ||
1da177e4 LT |
65 | /* |
66 | * Function Prototypes | |
67 | */ | |
68 | ||
69 | /* | |
70 | * WAN device IOCTL handlers | |
71 | */ | |
72 | ||
73 | static int wanrouter_device_setup(struct wan_device *wandev, | |
74 | wandev_conf_t __user *u_conf); | |
75 | static int wanrouter_device_stat(struct wan_device *wandev, | |
76 | wandev_stat_t __user *u_stat); | |
77 | static int wanrouter_device_shutdown(struct wan_device *wandev); | |
78 | static int wanrouter_device_new_if(struct wan_device *wandev, | |
79 | wanif_conf_t __user *u_conf); | |
80 | static int wanrouter_device_del_if(struct wan_device *wandev, | |
81 | char __user *u_name); | |
82 | ||
83 | /* | |
84 | * Miscellaneous | |
85 | */ | |
86 | ||
87 | static struct wan_device *wanrouter_find_device(char *name); | |
88 | static int wanrouter_delete_interface(struct wan_device *wandev, char *name); | |
97353cb4 AB |
89 | static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags); |
90 | static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags); | |
1da177e4 LT |
91 | |
92 | ||
93 | ||
94 | /* | |
95 | * Global Data | |
96 | */ | |
97 | ||
98 | static char wanrouter_fullname[] = "Sangoma WANPIPE Router"; | |
99 | static char wanrouter_copyright[] = "(c) 1995-2000 Sangoma Technologies Inc."; | |
100 | static char wanrouter_modname[] = ROUTER_NAME; /* short module name */ | |
101 | struct wan_device* wanrouter_router_devlist; /* list of registered devices */ | |
102 | ||
103 | /* | |
104 | * Organize Unique Identifiers for encapsulation/decapsulation | |
105 | */ | |
106 | ||
1da177e4 | 107 | #if 0 |
97353cb4 | 108 | static unsigned char wanrouter_oui_ether[] = { 0x00, 0x00, 0x00 }; |
1da177e4 LT |
109 | static unsigned char wanrouter_oui_802_2[] = { 0x00, 0x80, 0xC2 }; |
110 | #endif | |
111 | ||
112 | static int __init wanrouter_init(void) | |
113 | { | |
114 | int err; | |
115 | ||
116 | printk(KERN_INFO "%s v%u.%u %s\n", | |
117 | wanrouter_fullname, ROUTER_VERSION, ROUTER_RELEASE, | |
118 | wanrouter_copyright); | |
119 | ||
120 | err = wanrouter_proc_init(); | |
121 | if (err) | |
122 | printk(KERN_INFO "%s: can't create entry in proc filesystem!\n", | |
123 | wanrouter_modname); | |
124 | ||
125 | return err; | |
126 | } | |
127 | ||
128 | static void __exit wanrouter_cleanup (void) | |
129 | { | |
130 | wanrouter_proc_cleanup(); | |
131 | } | |
132 | ||
133 | /* | |
134 | * This is just plain dumb. We should move the bugger to drivers/net/wan, | |
135 | * slap it first in directory and make it module_init(). The only reason | |
136 | * for subsys_initcall() here is that net goes after drivers (why, BTW?) | |
137 | */ | |
138 | subsys_initcall(wanrouter_init); | |
139 | module_exit(wanrouter_cleanup); | |
140 | ||
141 | /* | |
142 | * Kernel APIs | |
143 | */ | |
144 | ||
145 | /* | |
146 | * Register WAN device. | |
147 | * o verify device credentials | |
148 | * o create an entry for the device in the /proc/net/router directory | |
149 | * o initialize internally maintained fields of the wan_device structure | |
150 | * o link device data space to a singly-linked list | |
151 | * o if it's the first device, then start kernel 'thread' | |
152 | * o increment module use count | |
153 | * | |
154 | * Return: | |
155 | * 0 Ok | |
156 | * < 0 error. | |
157 | * | |
158 | * Context: process | |
159 | */ | |
160 | ||
161 | ||
162 | int register_wan_device(struct wan_device *wandev) | |
163 | { | |
164 | int err, namelen; | |
165 | ||
166 | if ((wandev == NULL) || (wandev->magic != ROUTER_MAGIC) || | |
167 | (wandev->name == NULL)) | |
168 | return -EINVAL; | |
169 | ||
170 | namelen = strlen(wandev->name); | |
171 | if (!namelen || (namelen > WAN_DRVNAME_SZ)) | |
172 | return -EINVAL; | |
173 | ||
174 | if (wanrouter_find_device(wandev->name)) | |
175 | return -EEXIST; | |
176 | ||
177 | #ifdef WANDEBUG | |
178 | printk(KERN_INFO "%s: registering WAN device %s\n", | |
179 | wanrouter_modname, wandev->name); | |
180 | #endif | |
181 | ||
182 | /* | |
183 | * Register /proc directory entry | |
184 | */ | |
185 | err = wanrouter_proc_add(wandev); | |
186 | if (err) { | |
187 | printk(KERN_INFO | |
188 | "%s: can't create /proc/net/router/%s entry!\n", | |
189 | wanrouter_modname, wandev->name); | |
190 | return err; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Initialize fields of the wan_device structure maintained by the | |
195 | * router and update local data. | |
196 | */ | |
197 | ||
198 | wandev->ndev = 0; | |
199 | wandev->dev = NULL; | |
200 | wandev->next = wanrouter_router_devlist; | |
201 | wanrouter_router_devlist = wandev; | |
202 | return 0; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Unregister WAN device. | |
207 | * o shut down device | |
208 | * o unlink device data space from the linked list | |
209 | * o delete device entry in the /proc/net/router directory | |
210 | * o decrement module use count | |
211 | * | |
212 | * Return: 0 Ok | |
213 | * <0 error. | |
214 | * Context: process | |
215 | */ | |
216 | ||
217 | ||
218 | int unregister_wan_device(char *name) | |
219 | { | |
220 | struct wan_device *wandev, *prev; | |
221 | ||
222 | if (name == NULL) | |
223 | return -EINVAL; | |
224 | ||
225 | for (wandev = wanrouter_router_devlist, prev = NULL; | |
226 | wandev && strcmp(wandev->name, name); | |
227 | prev = wandev, wandev = wandev->next) | |
228 | ; | |
229 | if (wandev == NULL) | |
230 | return -ENODEV; | |
231 | ||
232 | #ifdef WANDEBUG | |
233 | printk(KERN_INFO "%s: unregistering WAN device %s\n", | |
234 | wanrouter_modname, name); | |
235 | #endif | |
236 | ||
237 | if (wandev->state != WAN_UNCONFIGURED) | |
238 | wanrouter_device_shutdown(wandev); | |
239 | ||
240 | if (prev) | |
241 | prev->next = wandev->next; | |
242 | else | |
243 | wanrouter_router_devlist = wandev->next; | |
244 | ||
245 | wanrouter_proc_delete(wandev); | |
246 | return 0; | |
247 | } | |
248 | ||
97353cb4 AB |
249 | #if 0 |
250 | ||
1da177e4 LT |
251 | /* |
252 | * Encapsulate packet. | |
253 | * | |
254 | * Return: encapsulation header size | |
255 | * < 0 - unsupported Ethertype | |
256 | * | |
257 | * Notes: | |
258 | * 1. This function may be called on interrupt context. | |
259 | */ | |
260 | ||
261 | ||
262 | int wanrouter_encapsulate(struct sk_buff *skb, struct net_device *dev, | |
263 | unsigned short type) | |
264 | { | |
265 | int hdr_len = 0; | |
266 | ||
267 | switch (type) { | |
268 | case ETH_P_IP: /* IP datagram encapsulation */ | |
269 | hdr_len += 1; | |
270 | skb_push(skb, 1); | |
271 | skb->data[0] = NLPID_IP; | |
272 | break; | |
273 | ||
274 | case ETH_P_IPX: /* SNAP encapsulation */ | |
275 | case ETH_P_ARP: | |
276 | hdr_len += 7; | |
277 | skb_push(skb, 7); | |
278 | skb->data[0] = 0; | |
279 | skb->data[1] = NLPID_SNAP; | |
280 | memcpy(&skb->data[2], wanrouter_oui_ether, | |
281 | sizeof(wanrouter_oui_ether)); | |
282 | *((unsigned short*)&skb->data[5]) = htons(type); | |
283 | break; | |
284 | ||
285 | default: /* Unknown packet type */ | |
286 | printk(KERN_INFO | |
287 | "%s: unsupported Ethertype 0x%04X on interface %s!\n", | |
288 | wanrouter_modname, type, dev->name); | |
289 | hdr_len = -EINVAL; | |
290 | } | |
291 | return hdr_len; | |
292 | } | |
293 | ||
294 | ||
295 | /* | |
296 | * Decapsulate packet. | |
297 | * | |
298 | * Return: Ethertype (in network order) | |
299 | * 0 unknown encapsulation | |
300 | * | |
301 | * Notes: | |
302 | * 1. This function may be called on interrupt context. | |
303 | */ | |
304 | ||
305 | ||
ab611487 | 306 | __be16 wanrouter_type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
307 | { |
308 | int cnt = skb->data[0] ? 0 : 1; /* there may be a pad present */ | |
ab611487 | 309 | __be16 ethertype; |
1da177e4 LT |
310 | |
311 | switch (skb->data[cnt]) { | |
312 | case NLPID_IP: /* IP datagramm */ | |
313 | ethertype = htons(ETH_P_IP); | |
314 | cnt += 1; | |
315 | break; | |
316 | ||
4ba6122b | 317 | case NLPID_SNAP: /* SNAP encapsulation */ |
1da177e4 LT |
318 | if (memcmp(&skb->data[cnt + 1], wanrouter_oui_ether, |
319 | sizeof(wanrouter_oui_ether))){ | |
4ba6122b | 320 | printk(KERN_INFO |
1da177e4 LT |
321 | "%s: unsupported SNAP OUI %02X-%02X-%02X " |
322 | "on interface %s!\n", wanrouter_modname, | |
323 | skb->data[cnt+1], skb->data[cnt+2], | |
324 | skb->data[cnt+3], dev->name); | |
325 | return 0; | |
326 | } | |
ab611487 | 327 | ethertype = *((__be16*)&skb->data[cnt+4]); |
1da177e4 LT |
328 | cnt += 6; |
329 | break; | |
330 | ||
331 | /* add other protocols, e.g. CLNP, ESIS, ISIS, if needed */ | |
332 | ||
333 | default: | |
334 | printk(KERN_INFO | |
335 | "%s: unsupported NLPID 0x%02X on interface %s!\n", | |
336 | wanrouter_modname, skb->data[cnt], dev->name); | |
337 | return 0; | |
338 | } | |
339 | skb->protocol = ethertype; | |
340 | skb->pkt_type = PACKET_HOST; /* Physically point to point */ | |
341 | skb_pull(skb, cnt); | |
342 | skb->mac.raw = skb->data; | |
343 | return ethertype; | |
344 | } | |
345 | ||
97353cb4 | 346 | #endif /* 0 */ |
1da177e4 LT |
347 | |
348 | /* | |
349 | * WAN device IOCTL. | |
350 | * o find WAN device associated with this node | |
351 | * o execute requested action or pass command to the device driver | |
352 | */ | |
353 | ||
354 | int wanrouter_ioctl(struct inode *inode, struct file *file, | |
355 | unsigned int cmd, unsigned long arg) | |
356 | { | |
357 | int err = 0; | |
358 | struct proc_dir_entry *dent; | |
359 | struct wan_device *wandev; | |
360 | void __user *data = (void __user *)arg; | |
361 | ||
362 | if (!capable(CAP_NET_ADMIN)) | |
363 | return -EPERM; | |
364 | ||
365 | if ((cmd >> 8) != ROUTER_IOCTL) | |
366 | return -EINVAL; | |
367 | ||
368 | dent = PDE(inode); | |
369 | if ((dent == NULL) || (dent->data == NULL)) | |
370 | return -EINVAL; | |
371 | ||
372 | wandev = dent->data; | |
373 | if (wandev->magic != ROUTER_MAGIC) | |
374 | return -EINVAL; | |
375 | ||
376 | switch (cmd) { | |
377 | case ROUTER_SETUP: | |
378 | err = wanrouter_device_setup(wandev, data); | |
379 | break; | |
380 | ||
381 | case ROUTER_DOWN: | |
382 | err = wanrouter_device_shutdown(wandev); | |
383 | break; | |
384 | ||
385 | case ROUTER_STAT: | |
386 | err = wanrouter_device_stat(wandev, data); | |
387 | break; | |
388 | ||
389 | case ROUTER_IFNEW: | |
390 | err = wanrouter_device_new_if(wandev, data); | |
391 | break; | |
392 | ||
393 | case ROUTER_IFDEL: | |
394 | err = wanrouter_device_del_if(wandev, data); | |
395 | break; | |
396 | ||
397 | case ROUTER_IFSTAT: | |
398 | break; | |
399 | ||
400 | default: | |
401 | if ((cmd >= ROUTER_USER) && | |
402 | (cmd <= ROUTER_USER_MAX) && | |
403 | wandev->ioctl) | |
404 | err = wandev->ioctl(wandev, cmd, arg); | |
405 | else err = -EINVAL; | |
406 | } | |
407 | return err; | |
408 | } | |
409 | ||
410 | /* | |
411 | * WAN Driver IOCTL Handlers | |
412 | */ | |
413 | ||
414 | /* | |
415 | * Setup WAN link device. | |
416 | * o verify user address space | |
417 | * o allocate kernel memory and copy configuration data to kernel space | |
418 | * o if configuration data includes extension, copy it to kernel space too | |
419 | * o call driver's setup() entry point | |
420 | */ | |
421 | ||
422 | static int wanrouter_device_setup(struct wan_device *wandev, | |
423 | wandev_conf_t __user *u_conf) | |
424 | { | |
425 | void *data = NULL; | |
426 | wandev_conf_t *conf; | |
427 | int err = -EINVAL; | |
428 | ||
429 | if (wandev->setup == NULL) { /* Nothing to do ? */ | |
430 | printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n", | |
431 | wandev->name); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL); | |
436 | if (conf == NULL){ | |
437 | printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n", | |
438 | wandev->name); | |
439 | return -ENOBUFS; | |
440 | } | |
441 | ||
442 | if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) { | |
443 | printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n", | |
444 | wandev->name); | |
445 | kfree(conf); | |
446 | return -EFAULT; | |
447 | } | |
448 | ||
449 | if (conf->magic != ROUTER_MAGIC) { | |
450 | kfree(conf); | |
451 | printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n", | |
452 | wandev->name); | |
4ba6122b | 453 | return -EINVAL; |
1da177e4 LT |
454 | } |
455 | ||
456 | if (conf->data_size && conf->data) { | |
457 | if (conf->data_size > 128000 || conf->data_size < 0) { | |
458 | printk(KERN_INFO | |
459 | "%s: ERROR, Invalid firmware data size %i !\n", | |
460 | wandev->name, conf->data_size); | |
461 | kfree(conf); | |
4ba6122b | 462 | return -EINVAL; |
1da177e4 LT |
463 | } |
464 | ||
465 | data = vmalloc(conf->data_size); | |
466 | if (!data) { | |
467 | printk(KERN_INFO | |
4ba6122b | 468 | "%s: ERROR, Faild allocate kernel memory !\n", |
1da177e4 LT |
469 | wandev->name); |
470 | kfree(conf); | |
471 | return -ENOBUFS; | |
472 | } | |
473 | if (!copy_from_user(data, conf->data, conf->data_size)) { | |
474 | conf->data = data; | |
475 | err = wandev->setup(wandev, conf); | |
476 | } else { | |
477 | printk(KERN_INFO | |
478 | "%s: ERROR, Faild to copy from user data !\n", | |
479 | wandev->name); | |
480 | err = -EFAULT; | |
481 | } | |
482 | vfree(data); | |
483 | } else { | |
484 | printk(KERN_INFO | |
485 | "%s: ERROR, No firmware found ! Firmware size = %i !\n", | |
486 | wandev->name, conf->data_size); | |
487 | } | |
488 | ||
489 | kfree(conf); | |
490 | return err; | |
491 | } | |
492 | ||
493 | /* | |
494 | * Shutdown WAN device. | |
495 | * o delete all not opened logical channels for this device | |
496 | * o call driver's shutdown() entry point | |
497 | */ | |
498 | ||
499 | static int wanrouter_device_shutdown(struct wan_device *wandev) | |
500 | { | |
501 | struct net_device *dev; | |
502 | int err=0; | |
503 | ||
504 | if (wandev->state == WAN_UNCONFIGURED) | |
505 | return 0; | |
506 | ||
507 | printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name); | |
508 | ||
509 | for (dev = wandev->dev; dev;) { | |
510 | err = wanrouter_delete_interface(wandev, dev->name); | |
511 | if (err) | |
512 | return err; | |
513 | /* The above function deallocates the current dev | |
514 | * structure. Therefore, we cannot use dev->priv | |
515 | * as the next element: wandev->dev points to the | |
516 | * next element */ | |
517 | dev = wandev->dev; | |
518 | } | |
519 | ||
520 | if (wandev->ndev) | |
521 | return -EBUSY; /* there are opened interfaces */ | |
522 | ||
523 | if (wandev->shutdown) | |
524 | err=wandev->shutdown(wandev); | |
525 | ||
526 | return err; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Get WAN device status & statistics. | |
531 | */ | |
532 | ||
533 | static int wanrouter_device_stat(struct wan_device *wandev, | |
534 | wandev_stat_t __user *u_stat) | |
535 | { | |
536 | wandev_stat_t stat; | |
537 | ||
538 | memset(&stat, 0, sizeof(stat)); | |
539 | ||
540 | /* Ask device driver to update device statistics */ | |
541 | if ((wandev->state != WAN_UNCONFIGURED) && wandev->update) | |
542 | wandev->update(wandev); | |
543 | ||
544 | /* Fill out structure */ | |
545 | stat.ndev = wandev->ndev; | |
546 | stat.state = wandev->state; | |
547 | ||
548 | if (copy_to_user(u_stat, &stat, sizeof(stat))) | |
549 | return -EFAULT; | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | /* | |
555 | * Create new WAN interface. | |
556 | * o verify user address space | |
557 | * o copy configuration data to kernel address space | |
558 | * o allocate network interface data space | |
559 | * o call driver's new_if() entry point | |
560 | * o make sure there is no interface name conflict | |
561 | * o register network interface | |
562 | */ | |
563 | ||
564 | static int wanrouter_device_new_if(struct wan_device *wandev, | |
565 | wanif_conf_t __user *u_conf) | |
566 | { | |
567 | wanif_conf_t *cnf; | |
568 | struct net_device *dev = NULL; | |
569 | #ifdef CONFIG_WANPIPE_MULTPPP | |
570 | struct ppp_device *pppdev=NULL; | |
571 | #endif | |
572 | int err; | |
573 | ||
574 | if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL)) | |
575 | return -ENODEV; | |
576 | ||
577 | cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL); | |
578 | if (!cnf) | |
579 | return -ENOBUFS; | |
580 | ||
581 | err = -EFAULT; | |
582 | if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t))) | |
583 | goto out; | |
584 | ||
585 | err = -EINVAL; | |
586 | if (cnf->magic != ROUTER_MAGIC) | |
587 | goto out; | |
588 | ||
589 | if (cnf->config_id == WANCONFIG_MPPP) { | |
590 | #ifdef CONFIG_WANPIPE_MULTPPP | |
0da974f4 | 591 | pppdev = kzalloc(sizeof(struct ppp_device), GFP_KERNEL); |
1da177e4 LT |
592 | err = -ENOBUFS; |
593 | if (pppdev == NULL) | |
594 | goto out; | |
0da974f4 | 595 | pppdev->dev = kzalloc(sizeof(struct net_device), GFP_KERNEL); |
1da177e4 LT |
596 | if (pppdev->dev == NULL) { |
597 | kfree(pppdev); | |
598 | err = -ENOBUFS; | |
599 | goto out; | |
600 | } | |
1da177e4 LT |
601 | err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf); |
602 | dev = pppdev->dev; | |
603 | #else | |
604 | printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n", | |
605 | wandev->name); | |
606 | err = -EPROTONOSUPPORT; | |
607 | goto out; | |
608 | #endif | |
609 | } else { | |
0da974f4 | 610 | dev = kzalloc(sizeof(struct net_device), GFP_KERNEL); |
1da177e4 LT |
611 | err = -ENOBUFS; |
612 | if (dev == NULL) | |
613 | goto out; | |
1da177e4 LT |
614 | err = wandev->new_if(wandev, dev, cnf); |
615 | } | |
616 | ||
617 | if (!err) { | |
618 | /* Register network interface. This will invoke init() | |
619 | * function supplied by the driver. If device registered | |
620 | * successfully, add it to the interface list. | |
621 | */ | |
622 | ||
623 | if (dev->name == NULL) { | |
624 | err = -EINVAL; | |
625 | } else { | |
626 | ||
627 | #ifdef WANDEBUG | |
628 | printk(KERN_INFO "%s: registering interface %s...\n", | |
629 | wanrouter_modname, dev->name); | |
630 | #endif | |
631 | ||
632 | err = register_netdev(dev); | |
633 | if (!err) { | |
634 | struct net_device *slave = NULL; | |
635 | unsigned long smp_flags=0; | |
636 | ||
637 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
638 | ||
639 | if (wandev->dev == NULL) { | |
640 | wandev->dev = dev; | |
641 | } else { | |
642 | for (slave=wandev->dev; | |
643 | *((struct net_device **)slave->priv); | |
644 | slave = *((struct net_device **)slave->priv)); | |
645 | ||
646 | *((struct net_device **)slave->priv) = dev; | |
647 | } | |
648 | ++wandev->ndev; | |
649 | ||
650 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
651 | err = 0; /* done !!! */ | |
652 | goto out; | |
653 | } | |
654 | } | |
655 | if (wandev->del_if) | |
656 | wandev->del_if(wandev, dev); | |
657 | } | |
658 | ||
659 | /* This code has moved from del_if() function */ | |
a51482bd JJ |
660 | kfree(dev->priv); |
661 | dev->priv = NULL; | |
1da177e4 LT |
662 | |
663 | #ifdef CONFIG_WANPIPE_MULTPPP | |
664 | if (cnf->config_id == WANCONFIG_MPPP) | |
665 | kfree(pppdev); | |
666 | else | |
667 | kfree(dev); | |
668 | #else | |
669 | /* Sync PPP is disabled */ | |
670 | if (cnf->config_id != WANCONFIG_MPPP) | |
671 | kfree(dev); | |
672 | #endif | |
673 | ||
674 | out: | |
675 | kfree(cnf); | |
676 | return err; | |
677 | } | |
678 | ||
679 | ||
680 | /* | |
681 | * Delete WAN logical channel. | |
682 | * o verify user address space | |
683 | * o copy configuration data to kernel address space | |
684 | */ | |
685 | ||
686 | static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name) | |
687 | { | |
688 | char name[WAN_IFNAME_SZ + 1]; | |
4ba6122b | 689 | int err = 0; |
1da177e4 LT |
690 | |
691 | if (wandev->state == WAN_UNCONFIGURED) | |
692 | return -ENODEV; | |
693 | ||
694 | memset(name, 0, sizeof(name)); | |
695 | ||
696 | if (copy_from_user(name, u_name, WAN_IFNAME_SZ)) | |
697 | return -EFAULT; | |
698 | ||
699 | err = wanrouter_delete_interface(wandev, name); | |
700 | if (err) | |
701 | return err; | |
702 | ||
703 | /* If last interface being deleted, shutdown card | |
704 | * This helps with administration at leaf nodes | |
705 | * (You can tell if the person at the other end of the phone | |
706 | * has an interface configured) and avoids DoS vulnerabilities | |
707 | * in binary driver files - this fixes a problem with the current | |
708 | * Sangoma driver going into strange states when all the network | |
709 | * interfaces are deleted and the link irrecoverably disconnected. | |
710 | */ | |
711 | ||
4ba6122b YH |
712 | if (!wandev->ndev && wandev->shutdown) |
713 | err = wandev->shutdown(wandev); | |
1da177e4 LT |
714 | |
715 | return err; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Miscellaneous Functions | |
720 | */ | |
721 | ||
722 | /* | |
723 | * Find WAN device by name. | |
724 | * Return pointer to the WAN device data space or NULL if device not found. | |
725 | */ | |
726 | ||
727 | static struct wan_device *wanrouter_find_device(char *name) | |
728 | { | |
729 | struct wan_device *wandev; | |
730 | ||
731 | for (wandev = wanrouter_router_devlist; | |
732 | wandev && strcmp(wandev->name, name); | |
733 | wandev = wandev->next); | |
734 | return wandev; | |
735 | } | |
736 | ||
737 | /* | |
738 | * Delete WAN logical channel identified by its name. | |
739 | * o find logical channel by its name | |
740 | * o call driver's del_if() entry point | |
741 | * o unregister network interface | |
742 | * o unlink channel data space from linked list of channels | |
743 | * o release channel data space | |
744 | * | |
745 | * Return: 0 success | |
746 | * -ENODEV channel not found. | |
747 | * -EBUSY interface is open | |
748 | * | |
749 | * Note: If (force != 0), then device will be destroyed even if interface | |
750 | * associated with it is open. It's caller's responsibility to make | |
751 | * sure that opened interfaces are not removed! | |
752 | */ | |
753 | ||
754 | static int wanrouter_delete_interface(struct wan_device *wandev, char *name) | |
755 | { | |
756 | struct net_device *dev = NULL, *prev = NULL; | |
757 | unsigned long smp_flags=0; | |
758 | ||
759 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
760 | dev = wandev->dev; | |
761 | prev = NULL; | |
762 | while (dev && strcmp(name, dev->name)) { | |
763 | struct net_device **slave = dev->priv; | |
764 | prev = dev; | |
765 | dev = *slave; | |
766 | } | |
767 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
768 | ||
769 | if (dev == NULL) | |
770 | return -ENODEV; /* interface not found */ | |
771 | ||
772 | if (netif_running(dev)) | |
773 | return -EBUSY; /* interface in use */ | |
774 | ||
775 | if (wandev->del_if) | |
776 | wandev->del_if(wandev, dev); | |
777 | ||
778 | lock_adapter_irq(&wandev->lock, &smp_flags); | |
779 | if (prev) { | |
780 | struct net_device **prev_slave = prev->priv; | |
781 | struct net_device **slave = dev->priv; | |
782 | ||
783 | *prev_slave = *slave; | |
784 | } else { | |
785 | struct net_device **slave = dev->priv; | |
786 | wandev->dev = *slave; | |
787 | } | |
788 | --wandev->ndev; | |
789 | unlock_adapter_irq(&wandev->lock, &smp_flags); | |
790 | ||
791 | printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name); | |
792 | ||
793 | /* Due to new interface linking method using dev->priv, | |
794 | * this code has moved from del_if() function.*/ | |
a51482bd JJ |
795 | kfree(dev->priv); |
796 | dev->priv=NULL; | |
1da177e4 LT |
797 | |
798 | unregister_netdev(dev); | |
799 | ||
800 | free_netdev(dev); | |
801 | ||
802 | return 0; | |
803 | } | |
804 | ||
97353cb4 | 805 | static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
1da177e4 | 806 | { |
4ba6122b | 807 | spin_lock_irqsave(lock, *smp_flags); |
1da177e4 LT |
808 | } |
809 | ||
810 | ||
97353cb4 | 811 | static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags) |
1da177e4 LT |
812 | { |
813 | spin_unlock_irqrestore(lock, *smp_flags); | |
814 | } | |
815 | ||
816 | EXPORT_SYMBOL(register_wan_device); | |
817 | EXPORT_SYMBOL(unregister_wan_device); | |
1da177e4 LT |
818 | |
819 | MODULE_LICENSE("GPL"); | |
820 | ||
821 | /* | |
822 | * End | |
823 | */ |