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Commit | Line | Data |
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1da177e4 LT |
1 | /* 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 | ||
99824461 | 10 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
1da177e4 | 11 | |
1da177e4 LT |
12 | #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> | |
4fc268d2 | 19 | #include <linux/capability.h> |
1da177e4 | 20 | #include <linux/delay.h> |
57b47a53 IM |
21 | #include <linux/mutex.h> |
22 | ||
1da177e4 LT |
23 | #include <net/sock.h> /* for struct sock */ |
24 | ||
25 | #include "common.h" | |
26 | #include "resources.h" | |
27 | #include "addr.h" | |
28 | ||
29 | ||
30 | LIST_HEAD(atm_devs); | |
57b47a53 | 31 | DEFINE_MUTEX(atm_dev_mutex); |
1da177e4 LT |
32 | |
33 | static struct atm_dev *__alloc_atm_dev(const char *type) | |
34 | { | |
35 | struct atm_dev *dev; | |
36 | ||
0da974f4 | 37 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
38 | if (!dev) |
39 | return NULL; | |
1da177e4 LT |
40 | dev->type = type; |
41 | dev->signal = ATM_PHY_SIG_UNKNOWN; | |
42 | dev->link_rate = ATM_OC3_PCR; | |
43 | spin_lock_init(&dev->lock); | |
44 | INIT_LIST_HEAD(&dev->local); | |
0f21ba7c | 45 | INIT_LIST_HEAD(&dev->lecs); |
1da177e4 LT |
46 | |
47 | return dev; | |
48 | } | |
49 | ||
1da177e4 LT |
50 | static struct atm_dev *__atm_dev_lookup(int number) |
51 | { | |
52 | struct atm_dev *dev; | |
53 | struct list_head *p; | |
54 | ||
55 | list_for_each(p, &atm_devs) { | |
56 | dev = list_entry(p, struct atm_dev, dev_list); | |
aaaaaadb | 57 | if (dev->number == number) { |
1da177e4 LT |
58 | atm_dev_hold(dev); |
59 | return dev; | |
60 | } | |
61 | } | |
62 | return NULL; | |
63 | } | |
64 | ||
65 | struct atm_dev *atm_dev_lookup(int number) | |
66 | { | |
67 | struct atm_dev *dev; | |
68 | ||
57b47a53 | 69 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 70 | dev = __atm_dev_lookup(number); |
57b47a53 | 71 | mutex_unlock(&atm_dev_mutex); |
1da177e4 LT |
72 | return dev; |
73 | } | |
07b54c9a | 74 | EXPORT_SYMBOL(atm_dev_lookup); |
64bf69dd | 75 | |
1da177e4 LT |
76 | struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops, |
77 | int number, unsigned long *flags) | |
78 | { | |
79 | struct atm_dev *dev, *inuse; | |
80 | ||
81 | dev = __alloc_atm_dev(type); | |
82 | if (!dev) { | |
99824461 | 83 | pr_err("no space for dev %s\n", type); |
1da177e4 LT |
84 | return NULL; |
85 | } | |
57b47a53 | 86 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 87 | if (number != -1) { |
07b54c9a JP |
88 | inuse = __atm_dev_lookup(number); |
89 | if (inuse) { | |
1da177e4 | 90 | atm_dev_put(inuse); |
57b47a53 | 91 | mutex_unlock(&atm_dev_mutex); |
ebc37b61 | 92 | kfree(dev); |
1da177e4 LT |
93 | return NULL; |
94 | } | |
95 | dev->number = number; | |
96 | } else { | |
97 | dev->number = 0; | |
98 | while ((inuse = __atm_dev_lookup(dev->number))) { | |
99 | atm_dev_put(inuse); | |
100 | dev->number++; | |
101 | } | |
102 | } | |
103 | ||
104 | dev->ops = ops; | |
105 | if (flags) | |
106 | dev->flags = *flags; | |
107 | else | |
108 | memset(&dev->flags, 0, sizeof(dev->flags)); | |
109 | memset(&dev->stats, 0, sizeof(dev->stats)); | |
110 | atomic_set(&dev->refcnt, 1); | |
1da177e4 LT |
111 | |
112 | if (atm_proc_dev_register(dev) < 0) { | |
99824461 | 113 | pr_err("atm_proc_dev_register failed for dev %s\n", type); |
656d98b0 RK |
114 | goto out_fail; |
115 | } | |
116 | ||
117 | if (atm_register_sysfs(dev) < 0) { | |
99824461 | 118 | pr_err("atm_register_sysfs failed for dev %s\n", type); |
656d98b0 RK |
119 | atm_proc_dev_deregister(dev); |
120 | goto out_fail; | |
1da177e4 | 121 | } |
656d98b0 | 122 | |
aaaaaadb | 123 | list_add_tail(&dev->dev_list, &atm_devs); |
1da177e4 | 124 | |
656d98b0 RK |
125 | out: |
126 | mutex_unlock(&atm_dev_mutex); | |
1da177e4 | 127 | return dev; |
656d98b0 RK |
128 | |
129 | out_fail: | |
130 | kfree(dev); | |
131 | dev = NULL; | |
132 | goto out; | |
1da177e4 | 133 | } |
07b54c9a | 134 | EXPORT_SYMBOL(atm_dev_register); |
1da177e4 LT |
135 | |
136 | void atm_dev_deregister(struct atm_dev *dev) | |
137 | { | |
64bf69dd SG |
138 | BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags)); |
139 | set_bit(ATM_DF_REMOVED, &dev->flags); | |
140 | ||
141 | /* | |
f7d57453 YH |
142 | * if we remove current device from atm_devs list, new device |
143 | * with same number can appear, such we need deregister proc, | |
64bf69dd SG |
144 | * release async all vccs and remove them from vccs list too |
145 | */ | |
57b47a53 | 146 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 147 | list_del(&dev->dev_list); |
57b47a53 | 148 | mutex_unlock(&atm_dev_mutex); |
1da177e4 | 149 | |
64bf69dd | 150 | atm_dev_release_vccs(dev); |
656d98b0 | 151 | atm_unregister_sysfs(dev); |
64bf69dd | 152 | atm_proc_dev_deregister(dev); |
1da177e4 | 153 | |
64bf69dd | 154 | atm_dev_put(dev); |
1da177e4 | 155 | } |
07b54c9a | 156 | EXPORT_SYMBOL(atm_dev_deregister); |
1da177e4 LT |
157 | |
158 | static void copy_aal_stats(struct k_atm_aal_stats *from, | |
159 | struct atm_aal_stats *to) | |
160 | { | |
161 | #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i) | |
162 | __AAL_STAT_ITEMS | |
163 | #undef __HANDLE_ITEM | |
164 | } | |
165 | ||
1da177e4 LT |
166 | static void subtract_aal_stats(struct k_atm_aal_stats *from, |
167 | struct atm_aal_stats *to) | |
168 | { | |
169 | #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) | |
170 | __AAL_STAT_ITEMS | |
171 | #undef __HANDLE_ITEM | |
172 | } | |
173 | ||
07b54c9a JP |
174 | static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, |
175 | int zero) | |
1da177e4 LT |
176 | { |
177 | struct atm_dev_stats tmp; | |
178 | int error = 0; | |
179 | ||
180 | copy_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
181 | copy_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
182 | copy_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
183 | if (arg) | |
184 | error = copy_to_user(arg, &tmp, sizeof(tmp)); | |
185 | if (zero && !error) { | |
186 | subtract_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
187 | subtract_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
188 | subtract_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
189 | } | |
190 | return error ? -EFAULT : 0; | |
191 | } | |
192 | ||
8865c418 | 193 | int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat) |
1da177e4 LT |
194 | { |
195 | void __user *buf; | |
196 | int error, len, number, size = 0; | |
197 | struct atm_dev *dev; | |
198 | struct list_head *p; | |
199 | int *tmp_buf, *tmp_p; | |
8865c418 DW |
200 | int __user *sioc_len; |
201 | int __user *iobuf_len; | |
202 | ||
203 | #ifndef CONFIG_COMPAT | |
204 | compat = 0; /* Just so the compiler _knows_ */ | |
205 | #endif | |
206 | ||
1da177e4 | 207 | switch (cmd) { |
07b54c9a JP |
208 | case ATM_GETNAMES: |
209 | if (compat) { | |
8865c418 | 210 | #ifdef CONFIG_COMPAT |
07b54c9a JP |
211 | struct compat_atm_iobuf __user *ciobuf = arg; |
212 | compat_uptr_t cbuf; | |
213 | iobuf_len = &ciobuf->length; | |
214 | if (get_user(cbuf, &ciobuf->buffer)) | |
215 | return -EFAULT; | |
216 | buf = compat_ptr(cbuf); | |
8865c418 | 217 | #endif |
07b54c9a JP |
218 | } else { |
219 | struct atm_iobuf __user *iobuf = arg; | |
220 | iobuf_len = &iobuf->length; | |
221 | if (get_user(buf, &iobuf->buffer)) | |
1da177e4 | 222 | return -EFAULT; |
07b54c9a JP |
223 | } |
224 | if (get_user(len, iobuf_len)) | |
225 | return -EFAULT; | |
226 | mutex_lock(&atm_dev_mutex); | |
227 | list_for_each(p, &atm_devs) | |
228 | size += sizeof(int); | |
229 | if (size > len) { | |
57b47a53 | 230 | mutex_unlock(&atm_dev_mutex); |
07b54c9a JP |
231 | return -E2BIG; |
232 | } | |
233 | tmp_buf = kmalloc(size, GFP_ATOMIC); | |
234 | if (!tmp_buf) { | |
235 | mutex_unlock(&atm_dev_mutex); | |
236 | return -ENOMEM; | |
237 | } | |
238 | tmp_p = tmp_buf; | |
239 | list_for_each(p, &atm_devs) { | |
240 | dev = list_entry(p, struct atm_dev, dev_list); | |
241 | *tmp_p++ = dev->number; | |
242 | } | |
243 | mutex_unlock(&atm_dev_mutex); | |
244 | error = ((copy_to_user(buf, tmp_buf, size)) || | |
245 | put_user(size, iobuf_len)) | |
246 | ? -EFAULT : 0; | |
247 | kfree(tmp_buf); | |
248 | return error; | |
249 | default: | |
250 | break; | |
1da177e4 LT |
251 | } |
252 | ||
8865c418 DW |
253 | if (compat) { |
254 | #ifdef CONFIG_COMPAT | |
255 | struct compat_atmif_sioc __user *csioc = arg; | |
256 | compat_uptr_t carg; | |
257 | ||
258 | sioc_len = &csioc->length; | |
259 | if (get_user(carg, &csioc->arg)) | |
260 | return -EFAULT; | |
261 | buf = compat_ptr(carg); | |
262 | ||
263 | if (get_user(len, &csioc->length)) | |
264 | return -EFAULT; | |
265 | if (get_user(number, &csioc->number)) | |
266 | return -EFAULT; | |
267 | #endif | |
268 | } else { | |
269 | struct atmif_sioc __user *sioc = arg; | |
270 | ||
271 | sioc_len = &sioc->length; | |
272 | if (get_user(buf, &sioc->arg)) | |
273 | return -EFAULT; | |
274 | if (get_user(len, &sioc->length)) | |
275 | return -EFAULT; | |
276 | if (get_user(number, &sioc->number)) | |
277 | return -EFAULT; | |
278 | } | |
07b54c9a JP |
279 | |
280 | dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d", | |
281 | number); | |
282 | if (!dev) | |
1da177e4 | 283 | return -ENODEV; |
f7d57453 | 284 | |
1da177e4 | 285 | switch (cmd) { |
07b54c9a JP |
286 | case ATM_GETTYPE: |
287 | size = strlen(dev->type) + 1; | |
288 | if (copy_to_user(buf, dev->type, size)) { | |
289 | error = -EFAULT; | |
290 | goto done; | |
291 | } | |
292 | break; | |
293 | case ATM_GETESI: | |
294 | size = ESI_LEN; | |
295 | if (copy_to_user(buf, dev->esi, size)) { | |
296 | error = -EFAULT; | |
297 | goto done; | |
298 | } | |
299 | break; | |
300 | case ATM_SETESI: | |
301 | { | |
302 | int i; | |
303 | ||
304 | for (i = 0; i < ESI_LEN; i++) | |
305 | if (dev->esi[i]) { | |
306 | error = -EEXIST; | |
1da177e4 LT |
307 | goto done; |
308 | } | |
07b54c9a JP |
309 | } |
310 | /* fall through */ | |
311 | case ATM_SETESIF: | |
312 | { | |
313 | unsigned char esi[ESI_LEN]; | |
314 | ||
315 | if (!capable(CAP_NET_ADMIN)) { | |
316 | error = -EPERM; | |
317 | goto done; | |
318 | } | |
319 | if (copy_from_user(esi, buf, ESI_LEN)) { | |
320 | error = -EFAULT; | |
321 | goto done; | |
322 | } | |
323 | memcpy(dev->esi, esi, ESI_LEN); | |
324 | error = ESI_LEN; | |
325 | goto done; | |
326 | } | |
327 | case ATM_GETSTATZ: | |
328 | if (!capable(CAP_NET_ADMIN)) { | |
329 | error = -EPERM; | |
330 | goto done; | |
331 | } | |
332 | /* fall through */ | |
333 | case ATM_GETSTAT: | |
334 | size = sizeof(struct atm_dev_stats); | |
335 | error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ); | |
336 | if (error) | |
337 | goto done; | |
338 | break; | |
339 | case ATM_GETCIRANGE: | |
340 | size = sizeof(struct atm_cirange); | |
341 | if (copy_to_user(buf, &dev->ci_range, size)) { | |
342 | error = -EFAULT; | |
343 | goto done; | |
344 | } | |
345 | break; | |
346 | case ATM_GETLINKRATE: | |
347 | size = sizeof(int); | |
348 | if (copy_to_user(buf, &dev->link_rate, size)) { | |
349 | error = -EFAULT; | |
350 | goto done; | |
351 | } | |
352 | break; | |
353 | case ATM_RSTADDR: | |
354 | if (!capable(CAP_NET_ADMIN)) { | |
355 | error = -EPERM; | |
356 | goto done; | |
357 | } | |
358 | atm_reset_addr(dev, ATM_ADDR_LOCAL); | |
359 | break; | |
360 | case ATM_ADDADDR: | |
361 | case ATM_DELADDR: | |
362 | case ATM_ADDLECSADDR: | |
363 | case ATM_DELLECSADDR: | |
364 | { | |
365 | struct sockaddr_atmsvc addr; | |
366 | ||
367 | if (!capable(CAP_NET_ADMIN)) { | |
368 | error = -EPERM; | |
369 | goto done; | |
370 | } | |
371 | ||
372 | if (copy_from_user(&addr, buf, sizeof(addr))) { | |
373 | error = -EFAULT; | |
374 | goto done; | |
375 | } | |
376 | if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR) | |
377 | error = atm_add_addr(dev, &addr, | |
378 | (cmd == ATM_ADDADDR ? | |
0f21ba7c | 379 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); |
07b54c9a JP |
380 | else |
381 | error = atm_del_addr(dev, &addr, | |
382 | (cmd == ATM_DELADDR ? | |
383 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
384 | goto done; | |
385 | } | |
386 | case ATM_GETADDR: | |
387 | case ATM_GETLECSADDR: | |
388 | error = atm_get_addr(dev, buf, len, | |
389 | (cmd == ATM_GETADDR ? | |
390 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
391 | if (error < 0) | |
392 | goto done; | |
393 | size = error; | |
394 | /* may return 0, but later on size == 0 means "don't | |
395 | write the length" */ | |
396 | error = put_user(size, sioc_len) ? -EFAULT : 0; | |
397 | goto done; | |
398 | case ATM_SETLOOP: | |
399 | if (__ATM_LM_XTRMT((int) (unsigned long) buf) && | |
400 | __ATM_LM_XTLOC((int) (unsigned long) buf) > | |
401 | __ATM_LM_XTRMT((int) (unsigned long) buf)) { | |
402 | error = -EINVAL; | |
1da177e4 | 403 | goto done; |
07b54c9a JP |
404 | } |
405 | /* fall through */ | |
406 | case ATM_SETCIRANGE: | |
407 | case SONET_GETSTATZ: | |
408 | case SONET_SETDIAG: | |
409 | case SONET_CLRDIAG: | |
410 | case SONET_SETFRAMING: | |
411 | if (!capable(CAP_NET_ADMIN)) { | |
412 | error = -EPERM; | |
413 | goto done; | |
414 | } | |
415 | /* fall through */ | |
416 | default: | |
417 | if (compat) { | |
418 | #ifdef CONFIG_COMPAT | |
419 | if (!dev->ops->compat_ioctl) { | |
1da177e4 LT |
420 | error = -EINVAL; |
421 | goto done; | |
422 | } | |
07b54c9a | 423 | size = dev->ops->compat_ioctl(dev, cmd, buf); |
8865c418 | 424 | #endif |
07b54c9a JP |
425 | } else { |
426 | if (!dev->ops->ioctl) { | |
427 | error = -EINVAL; | |
1da177e4 LT |
428 | goto done; |
429 | } | |
07b54c9a JP |
430 | size = dev->ops->ioctl(dev, cmd, buf); |
431 | } | |
432 | if (size < 0) { | |
433 | error = (size == -ENOIOCTLCMD ? -EINVAL : size); | |
434 | goto done; | |
435 | } | |
1da177e4 | 436 | } |
f7d57453 | 437 | |
1da177e4 | 438 | if (size) |
07b54c9a | 439 | error = put_user(size, sioc_len) ? -EFAULT : 0; |
1da177e4 LT |
440 | else |
441 | error = 0; | |
442 | done: | |
443 | atm_dev_put(dev); | |
444 | return error; | |
445 | } | |
446 | ||
1da177e4 LT |
447 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) |
448 | { | |
f7d57453 | 449 | mutex_lock(&atm_dev_mutex); |
67de7924 | 450 | return seq_list_start_head(&atm_devs, *pos); |
1da177e4 LT |
451 | } |
452 | ||
453 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | |
454 | { | |
f7d57453 | 455 | mutex_unlock(&atm_dev_mutex); |
1da177e4 | 456 | } |
f7d57453 | 457 | |
1da177e4 LT |
458 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
459 | { | |
67de7924 | 460 | return seq_list_next(v, &atm_devs, pos); |
1da177e4 | 461 | } |