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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* net/atm/resources.c - Statically allocated resources */
2
3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5/* Fixes
6 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
7 * 2002/01 - don't free the whole struct sock on sk->destruct time,
8 * use the default destruct function initialized by sock_init_data */
9
Joe Perches99824462010-01-26 11:40:00 +000010#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/ctype.h>
13#include <linux/string.h>
14#include <linux/atmdev.h>
15#include <linux/sonet.h>
16#include <linux/kernel.h> /* for barrier */
17#include <linux/module.h>
18#include <linux/bitops.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080019#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/delay.h>
Ingo Molnar57b47a52006-03-20 22:35:41 -080021#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Ingo Molnar57b47a52006-03-20 22:35:41 -080023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <net/sock.h> /* for struct sock */
25
26#include "common.h"
27#include "resources.h"
28#include "addr.h"
29
30
31LIST_HEAD(atm_devs);
Ingo Molnar57b47a52006-03-20 22:35:41 -080032DEFINE_MUTEX(atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34static struct atm_dev *__alloc_atm_dev(const char *type)
35{
36 struct atm_dev *dev;
37
Panagiotis Issaris0da974f2006-07-21 14:51:30 -070038 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 if (!dev)
40 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 dev->type = type;
42 dev->signal = ATM_PHY_SIG_UNKNOWN;
43 dev->link_rate = ATM_OC3_PCR;
44 spin_lock_init(&dev->lock);
45 INIT_LIST_HEAD(&dev->local);
Eric Kinzie0f21ba72005-10-06 22:19:28 -070046 INIT_LIST_HEAD(&dev->lecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48 return dev;
49}
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static struct atm_dev *__atm_dev_lookup(int number)
52{
53 struct atm_dev *dev;
54 struct list_head *p;
55
56 list_for_each(p, &atm_devs) {
57 dev = list_entry(p, struct atm_dev, dev_list);
Stanislaw Gruszkaaaaaaad2005-11-29 16:16:21 -080058 if (dev->number == number) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 atm_dev_hold(dev);
60 return dev;
61 }
62 }
63 return NULL;
64}
65
66struct atm_dev *atm_dev_lookup(int number)
67{
68 struct atm_dev *dev;
69
Ingo Molnar57b47a52006-03-20 22:35:41 -080070 mutex_lock(&atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 dev = __atm_dev_lookup(number);
Ingo Molnar57b47a52006-03-20 22:35:41 -080072 mutex_unlock(&atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return dev;
74}
Joe Perches07b54c92010-01-26 11:40:16 +000075EXPORT_SYMBOL(atm_dev_lookup);
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -080076
Dan Williamsd9ca6762010-12-08 19:40:47 +000077struct atm_dev *atm_dev_register(const char *type, struct device *parent,
78 const struct atmdev_ops *ops, int number,
79 unsigned long *flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080{
81 struct atm_dev *dev, *inuse;
82
83 dev = __alloc_atm_dev(type);
84 if (!dev) {
Joe Perches99824462010-01-26 11:40:00 +000085 pr_err("no space for dev %s\n", type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 return NULL;
87 }
Ingo Molnar57b47a52006-03-20 22:35:41 -080088 mutex_lock(&atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 if (number != -1) {
Joe Perches07b54c92010-01-26 11:40:16 +000090 inuse = __atm_dev_lookup(number);
91 if (inuse) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 atm_dev_put(inuse);
Ingo Molnar57b47a52006-03-20 22:35:41 -080093 mutex_unlock(&atm_dev_mutex);
Adrian Bunkebc37b62005-04-21 16:48:26 -070094 kfree(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 return NULL;
96 }
97 dev->number = number;
98 } else {
99 dev->number = 0;
100 while ((inuse = __atm_dev_lookup(dev->number))) {
101 atm_dev_put(inuse);
102 dev->number++;
103 }
104 }
105
106 dev->ops = ops;
107 if (flags)
108 dev->flags = *flags;
109 else
110 memset(&dev->flags, 0, sizeof(dev->flags));
111 memset(&dev->stats, 0, sizeof(dev->stats));
112 atomic_set(&dev->refcnt, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 if (atm_proc_dev_register(dev) < 0) {
Joe Perches99824462010-01-26 11:40:00 +0000115 pr_err("atm_proc_dev_register failed for dev %s\n", type);
Roman Kagan656d98b2006-06-29 12:36:34 -0700116 goto out_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 }
118
Dan Williamsd9ca6762010-12-08 19:40:47 +0000119 if (atm_register_sysfs(dev, parent) < 0) {
Joe Perches99824462010-01-26 11:40:00 +0000120 pr_err("atm_register_sysfs failed for dev %s\n", type);
Roman Kagan656d98b2006-06-29 12:36:34 -0700121 atm_proc_dev_deregister(dev);
122 goto out_fail;
123 }
124
125 list_add_tail(&dev->dev_list, &atm_devs);
126
127out:
128 mutex_unlock(&atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return dev;
Roman Kagan656d98b2006-06-29 12:36:34 -0700130
131out_fail:
132 kfree(dev);
133 dev = NULL;
134 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
Joe Perches07b54c92010-01-26 11:40:16 +0000136EXPORT_SYMBOL(atm_dev_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138void atm_dev_deregister(struct atm_dev *dev)
139{
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -0800140 BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
141 set_bit(ATM_DF_REMOVED, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -0800143 /*
YOSHIFUJI Hideakif7d57452007-02-09 23:24:29 +0900144 * if we remove current device from atm_devs list, new device
145 * with same number can appear, such we need deregister proc,
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -0800146 * release async all vccs and remove them from vccs list too
147 */
Ingo Molnar57b47a52006-03-20 22:35:41 -0800148 mutex_lock(&atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 list_del(&dev->dev_list);
Ingo Molnar57b47a52006-03-20 22:35:41 -0800150 mutex_unlock(&atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -0800152 atm_dev_release_vccs(dev);
Roman Kagan656d98b2006-06-29 12:36:34 -0700153 atm_unregister_sysfs(dev);
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -0800154 atm_proc_dev_deregister(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Stanislaw Gruszka64bf69d2005-11-29 16:16:41 -0800156 atm_dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
Joe Perches07b54c92010-01-26 11:40:16 +0000158EXPORT_SYMBOL(atm_dev_deregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160static void copy_aal_stats(struct k_atm_aal_stats *from,
161 struct atm_aal_stats *to)
162{
163#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
164 __AAL_STAT_ITEMS
165#undef __HANDLE_ITEM
166}
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168static void subtract_aal_stats(struct k_atm_aal_stats *from,
169 struct atm_aal_stats *to)
170{
171#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
172 __AAL_STAT_ITEMS
173#undef __HANDLE_ITEM
174}
175
Joe Perches07b54c92010-01-26 11:40:16 +0000176static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
177 int zero)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
179 struct atm_dev_stats tmp;
180 int error = 0;
181
182 copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
183 copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
184 copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
185 if (arg)
186 error = copy_to_user(arg, &tmp, sizeof(tmp));
187 if (zero && !error) {
188 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
189 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
190 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
191 }
192 return error ? -EFAULT : 0;
193}
194
David Woodhouse8865c412008-12-03 22:12:38 -0800195int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 void __user *buf;
198 int error, len, number, size = 0;
199 struct atm_dev *dev;
200 struct list_head *p;
201 int *tmp_buf, *tmp_p;
David Woodhouse8865c412008-12-03 22:12:38 -0800202 int __user *sioc_len;
203 int __user *iobuf_len;
204
205#ifndef CONFIG_COMPAT
206 compat = 0; /* Just so the compiler _knows_ */
207#endif
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 switch (cmd) {
Joe Perches07b54c92010-01-26 11:40:16 +0000210 case ATM_GETNAMES:
211 if (compat) {
David Woodhouse8865c412008-12-03 22:12:38 -0800212#ifdef CONFIG_COMPAT
Joe Perches07b54c92010-01-26 11:40:16 +0000213 struct compat_atm_iobuf __user *ciobuf = arg;
214 compat_uptr_t cbuf;
215 iobuf_len = &ciobuf->length;
216 if (get_user(cbuf, &ciobuf->buffer))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 return -EFAULT;
Joe Perches07b54c92010-01-26 11:40:16 +0000218 buf = compat_ptr(cbuf);
219#endif
220 } else {
221 struct atm_iobuf __user *iobuf = arg;
222 iobuf_len = &iobuf->length;
223 if (get_user(buf, &iobuf->buffer))
224 return -EFAULT;
225 }
226 if (get_user(len, iobuf_len))
227 return -EFAULT;
228 mutex_lock(&atm_dev_mutex);
229 list_for_each(p, &atm_devs)
230 size += sizeof(int);
231 if (size > len) {
Ingo Molnar57b47a52006-03-20 22:35:41 -0800232 mutex_unlock(&atm_dev_mutex);
Joe Perches07b54c92010-01-26 11:40:16 +0000233 return -E2BIG;
234 }
235 tmp_buf = kmalloc(size, GFP_ATOMIC);
236 if (!tmp_buf) {
237 mutex_unlock(&atm_dev_mutex);
238 return -ENOMEM;
239 }
240 tmp_p = tmp_buf;
241 list_for_each(p, &atm_devs) {
242 dev = list_entry(p, struct atm_dev, dev_list);
243 *tmp_p++ = dev->number;
244 }
245 mutex_unlock(&atm_dev_mutex);
246 error = ((copy_to_user(buf, tmp_buf, size)) ||
247 put_user(size, iobuf_len))
248 ? -EFAULT : 0;
249 kfree(tmp_buf);
250 return error;
251 default:
252 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
254
David Woodhouse8865c412008-12-03 22:12:38 -0800255 if (compat) {
256#ifdef CONFIG_COMPAT
257 struct compat_atmif_sioc __user *csioc = arg;
258 compat_uptr_t carg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
David Woodhouse8865c412008-12-03 22:12:38 -0800260 sioc_len = &csioc->length;
261 if (get_user(carg, &csioc->arg))
262 return -EFAULT;
263 buf = compat_ptr(carg);
264
265 if (get_user(len, &csioc->length))
266 return -EFAULT;
267 if (get_user(number, &csioc->number))
268 return -EFAULT;
269#endif
270 } else {
271 struct atmif_sioc __user *sioc = arg;
272
273 sioc_len = &sioc->length;
274 if (get_user(buf, &sioc->arg))
275 return -EFAULT;
276 if (get_user(len, &sioc->length))
277 return -EFAULT;
278 if (get_user(number, &sioc->number))
279 return -EFAULT;
280 }
Joe Perches07b54c92010-01-26 11:40:16 +0000281
282 dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
283 number);
284 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return -ENODEV;
YOSHIFUJI Hideakif7d57452007-02-09 23:24:29 +0900286
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 switch (cmd) {
Joe Perches07b54c92010-01-26 11:40:16 +0000288 case ATM_GETTYPE:
289 size = strlen(dev->type) + 1;
290 if (copy_to_user(buf, dev->type, size)) {
291 error = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 goto done;
Joe Perches07b54c92010-01-26 11:40:16 +0000293 }
294 break;
295 case ATM_GETESI:
296 size = ESI_LEN;
297 if (copy_to_user(buf, dev->esi, size)) {
298 error = -EFAULT;
299 goto done;
300 }
301 break;
302 case ATM_SETESI:
303 {
304 int i;
305
306 for (i = 0; i < ESI_LEN; i++)
307 if (dev->esi[i]) {
308 error = -EEXIST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 goto done;
310 }
311 }
Joe Perches07b54c92010-01-26 11:40:16 +0000312 /* fall through */
313 case ATM_SETESIF:
314 {
315 unsigned char esi[ESI_LEN];
316
317 if (!capable(CAP_NET_ADMIN)) {
318 error = -EPERM;
319 goto done;
320 }
321 if (copy_from_user(esi, buf, ESI_LEN)) {
322 error = -EFAULT;
323 goto done;
324 }
325 memcpy(dev->esi, esi, ESI_LEN);
326 error = ESI_LEN;
327 goto done;
328 }
329 case ATM_GETSTATZ:
330 if (!capable(CAP_NET_ADMIN)) {
331 error = -EPERM;
332 goto done;
333 }
334 /* fall through */
335 case ATM_GETSTAT:
336 size = sizeof(struct atm_dev_stats);
337 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
338 if (error)
339 goto done;
340 break;
341 case ATM_GETCIRANGE:
342 size = sizeof(struct atm_cirange);
343 if (copy_to_user(buf, &dev->ci_range, size)) {
344 error = -EFAULT;
345 goto done;
346 }
347 break;
348 case ATM_GETLINKRATE:
349 size = sizeof(int);
350 if (copy_to_user(buf, &dev->link_rate, size)) {
351 error = -EFAULT;
352 goto done;
353 }
354 break;
355 case ATM_RSTADDR:
356 if (!capable(CAP_NET_ADMIN)) {
357 error = -EPERM;
358 goto done;
359 }
360 atm_reset_addr(dev, ATM_ADDR_LOCAL);
361 break;
362 case ATM_ADDADDR:
363 case ATM_DELADDR:
364 case ATM_ADDLECSADDR:
365 case ATM_DELLECSADDR:
366 {
367 struct sockaddr_atmsvc addr;
368
369 if (!capable(CAP_NET_ADMIN)) {
370 error = -EPERM;
371 goto done;
372 }
373
374 if (copy_from_user(&addr, buf, sizeof(addr))) {
375 error = -EFAULT;
376 goto done;
377 }
378 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
379 error = atm_add_addr(dev, &addr,
380 (cmd == ATM_ADDADDR ?
381 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
382 else
383 error = atm_del_addr(dev, &addr,
384 (cmd == ATM_DELADDR ?
385 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
386 goto done;
387 }
388 case ATM_GETADDR:
389 case ATM_GETLECSADDR:
390 error = atm_get_addr(dev, buf, len,
391 (cmd == ATM_GETADDR ?
392 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
393 if (error < 0)
394 goto done;
395 size = error;
396 /* may return 0, but later on size == 0 means "don't
397 write the length" */
398 error = put_user(size, sioc_len) ? -EFAULT : 0;
399 goto done;
400 case ATM_SETLOOP:
401 if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
402 __ATM_LM_XTLOC((int) (unsigned long) buf) >
403 __ATM_LM_XTRMT((int) (unsigned long) buf)) {
404 error = -EINVAL;
405 goto done;
406 }
407 /* fall through */
408 case ATM_SETCIRANGE:
409 case SONET_GETSTATZ:
410 case SONET_SETDIAG:
411 case SONET_CLRDIAG:
412 case SONET_SETFRAMING:
413 if (!capable(CAP_NET_ADMIN)) {
414 error = -EPERM;
415 goto done;
416 }
417 /* fall through */
418 default:
419 if (compat) {
420#ifdef CONFIG_COMPAT
421 if (!dev->ops->compat_ioctl) {
422 error = -EINVAL;
423 goto done;
424 }
425 size = dev->ops->compat_ioctl(dev, cmd, buf);
426#endif
427 } else {
428 if (!dev->ops->ioctl) {
429 error = -EINVAL;
430 goto done;
431 }
432 size = dev->ops->ioctl(dev, cmd, buf);
433 }
434 if (size < 0) {
435 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
436 goto done;
437 }
438 }
YOSHIFUJI Hideakif7d57452007-02-09 23:24:29 +0900439
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 if (size)
Joe Perches07b54c92010-01-26 11:40:16 +0000441 error = put_user(size, sioc_len) ? -EFAULT : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 else
443 error = 0;
444done:
445 atm_dev_put(dev);
446 return error;
447}
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
450{
YOSHIFUJI Hideakif7d57452007-02-09 23:24:29 +0900451 mutex_lock(&atm_dev_mutex);
Li Zefan67de7922010-02-08 23:21:51 +0000452 return seq_list_start_head(&atm_devs, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
455void atm_dev_seq_stop(struct seq_file *seq, void *v)
456{
YOSHIFUJI Hideakif7d57452007-02-09 23:24:29 +0900457 mutex_unlock(&atm_dev_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
YOSHIFUJI Hideakif7d57452007-02-09 23:24:29 +0900459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
461{
Li Zefan67de7922010-02-08 23:21:51 +0000462 return seq_list_next(v, &atm_devs, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463}