Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* net/atm/resources.c - Statically allocated resources */ |
3 | ||
4 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ | |
5 | ||
6 | /* Fixes | |
7 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
8 | * 2002/01 - don't free the whole struct sock on sk->destruct time, | |
9 | * use the default destruct function initialized by sock_init_data */ | |
10 | ||
99824461 | 11 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
1da177e4 | 12 | |
1da177e4 LT |
13 | #include <linux/ctype.h> |
14 | #include <linux/string.h> | |
15 | #include <linux/atmdev.h> | |
16 | #include <linux/sonet.h> | |
17 | #include <linux/kernel.h> /* for barrier */ | |
18 | #include <linux/module.h> | |
19 | #include <linux/bitops.h> | |
4fc268d2 | 20 | #include <linux/capability.h> |
1da177e4 | 21 | #include <linux/delay.h> |
57b47a53 | 22 | #include <linux/mutex.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
57b47a53 | 24 | |
1da177e4 LT |
25 | #include <net/sock.h> /* for struct sock */ |
26 | ||
27 | #include "common.h" | |
28 | #include "resources.h" | |
29 | #include "addr.h" | |
30 | ||
31 | ||
32 | LIST_HEAD(atm_devs); | |
57b47a53 | 33 | DEFINE_MUTEX(atm_dev_mutex); |
1da177e4 LT |
34 | |
35 | static struct atm_dev *__alloc_atm_dev(const char *type) | |
36 | { | |
37 | struct atm_dev *dev; | |
38 | ||
0da974f4 | 39 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
40 | if (!dev) |
41 | return NULL; | |
1da177e4 LT |
42 | dev->type = type; |
43 | dev->signal = ATM_PHY_SIG_UNKNOWN; | |
44 | dev->link_rate = ATM_OC3_PCR; | |
45 | spin_lock_init(&dev->lock); | |
46 | INIT_LIST_HEAD(&dev->local); | |
0f21ba7c | 47 | INIT_LIST_HEAD(&dev->lecs); |
1da177e4 LT |
48 | |
49 | return dev; | |
50 | } | |
51 | ||
1da177e4 LT |
52 | static struct atm_dev *__atm_dev_lookup(int number) |
53 | { | |
54 | struct atm_dev *dev; | |
55 | struct list_head *p; | |
56 | ||
57 | list_for_each(p, &atm_devs) { | |
58 | dev = list_entry(p, struct atm_dev, dev_list); | |
aaaaaadb | 59 | if (dev->number == number) { |
1da177e4 LT |
60 | atm_dev_hold(dev); |
61 | return dev; | |
62 | } | |
63 | } | |
64 | return NULL; | |
65 | } | |
66 | ||
67 | struct atm_dev *atm_dev_lookup(int number) | |
68 | { | |
69 | struct atm_dev *dev; | |
70 | ||
57b47a53 | 71 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 72 | dev = __atm_dev_lookup(number); |
57b47a53 | 73 | mutex_unlock(&atm_dev_mutex); |
1da177e4 LT |
74 | return dev; |
75 | } | |
07b54c9a | 76 | EXPORT_SYMBOL(atm_dev_lookup); |
64bf69dd | 77 | |
d9ca676b DW |
78 | struct atm_dev *atm_dev_register(const char *type, struct device *parent, |
79 | const struct atmdev_ops *ops, int number, | |
80 | unsigned long *flags) | |
1da177e4 LT |
81 | { |
82 | struct atm_dev *dev, *inuse; | |
83 | ||
84 | dev = __alloc_atm_dev(type); | |
85 | if (!dev) { | |
99824461 | 86 | pr_err("no space for dev %s\n", type); |
1da177e4 LT |
87 | return NULL; |
88 | } | |
57b47a53 | 89 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 90 | if (number != -1) { |
07b54c9a JP |
91 | inuse = __atm_dev_lookup(number); |
92 | if (inuse) { | |
1da177e4 | 93 | atm_dev_put(inuse); |
57b47a53 | 94 | mutex_unlock(&atm_dev_mutex); |
ebc37b61 | 95 | kfree(dev); |
1da177e4 LT |
96 | return NULL; |
97 | } | |
98 | dev->number = number; | |
99 | } else { | |
100 | dev->number = 0; | |
101 | while ((inuse = __atm_dev_lookup(dev->number))) { | |
102 | atm_dev_put(inuse); | |
103 | dev->number++; | |
104 | } | |
105 | } | |
106 | ||
107 | dev->ops = ops; | |
108 | if (flags) | |
109 | dev->flags = *flags; | |
110 | else | |
111 | memset(&dev->flags, 0, sizeof(dev->flags)); | |
112 | memset(&dev->stats, 0, sizeof(dev->stats)); | |
458bc30c | 113 | refcount_set(&dev->refcnt, 1); |
1da177e4 LT |
114 | |
115 | if (atm_proc_dev_register(dev) < 0) { | |
99824461 | 116 | pr_err("atm_proc_dev_register failed for dev %s\n", type); |
656d98b0 RK |
117 | goto out_fail; |
118 | } | |
119 | ||
d9ca676b | 120 | if (atm_register_sysfs(dev, parent) < 0) { |
99824461 | 121 | pr_err("atm_register_sysfs failed for dev %s\n", type); |
656d98b0 RK |
122 | atm_proc_dev_deregister(dev); |
123 | goto out_fail; | |
1da177e4 | 124 | } |
656d98b0 | 125 | |
aaaaaadb | 126 | list_add_tail(&dev->dev_list, &atm_devs); |
1da177e4 | 127 | |
656d98b0 RK |
128 | out: |
129 | mutex_unlock(&atm_dev_mutex); | |
1da177e4 | 130 | return dev; |
656d98b0 RK |
131 | |
132 | out_fail: | |
133 | kfree(dev); | |
134 | dev = NULL; | |
135 | goto out; | |
1da177e4 | 136 | } |
07b54c9a | 137 | EXPORT_SYMBOL(atm_dev_register); |
1da177e4 LT |
138 | |
139 | void atm_dev_deregister(struct atm_dev *dev) | |
140 | { | |
64bf69dd SG |
141 | BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags)); |
142 | set_bit(ATM_DF_REMOVED, &dev->flags); | |
143 | ||
144 | /* | |
f7d57453 YH |
145 | * if we remove current device from atm_devs list, new device |
146 | * with same number can appear, such we need deregister proc, | |
64bf69dd SG |
147 | * release async all vccs and remove them from vccs list too |
148 | */ | |
57b47a53 | 149 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 150 | list_del(&dev->dev_list); |
57b47a53 | 151 | mutex_unlock(&atm_dev_mutex); |
1da177e4 | 152 | |
64bf69dd | 153 | atm_dev_release_vccs(dev); |
656d98b0 | 154 | atm_unregister_sysfs(dev); |
64bf69dd | 155 | atm_proc_dev_deregister(dev); |
1da177e4 | 156 | |
64bf69dd | 157 | atm_dev_put(dev); |
1da177e4 | 158 | } |
07b54c9a | 159 | EXPORT_SYMBOL(atm_dev_deregister); |
1da177e4 LT |
160 | |
161 | static void copy_aal_stats(struct k_atm_aal_stats *from, | |
162 | struct atm_aal_stats *to) | |
163 | { | |
164 | #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i) | |
165 | __AAL_STAT_ITEMS | |
166 | #undef __HANDLE_ITEM | |
167 | } | |
168 | ||
1da177e4 LT |
169 | static void subtract_aal_stats(struct k_atm_aal_stats *from, |
170 | struct atm_aal_stats *to) | |
171 | { | |
172 | #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) | |
173 | __AAL_STAT_ITEMS | |
174 | #undef __HANDLE_ITEM | |
175 | } | |
176 | ||
07b54c9a JP |
177 | static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, |
178 | int zero) | |
1da177e4 LT |
179 | { |
180 | struct atm_dev_stats tmp; | |
181 | int error = 0; | |
182 | ||
183 | copy_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
184 | copy_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
185 | copy_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
186 | if (arg) | |
187 | error = copy_to_user(arg, &tmp, sizeof(tmp)); | |
188 | if (zero && !error) { | |
189 | subtract_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
190 | subtract_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
191 | subtract_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
192 | } | |
193 | return error ? -EFAULT : 0; | |
194 | } | |
195 | ||
8865c418 | 196 | int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat) |
1da177e4 LT |
197 | { |
198 | void __user *buf; | |
199 | int error, len, number, size = 0; | |
200 | struct atm_dev *dev; | |
201 | struct list_head *p; | |
202 | int *tmp_buf, *tmp_p; | |
8865c418 DW |
203 | int __user *sioc_len; |
204 | int __user *iobuf_len; | |
205 | ||
1da177e4 | 206 | switch (cmd) { |
07b54c9a | 207 | case ATM_GETNAMES: |
f9d19a74 | 208 | if (IS_ENABLED(CONFIG_COMPAT) && compat) { |
8865c418 | 209 | #ifdef CONFIG_COMPAT |
07b54c9a JP |
210 | struct compat_atm_iobuf __user *ciobuf = arg; |
211 | compat_uptr_t cbuf; | |
212 | iobuf_len = &ciobuf->length; | |
213 | if (get_user(cbuf, &ciobuf->buffer)) | |
214 | return -EFAULT; | |
215 | buf = compat_ptr(cbuf); | |
8865c418 | 216 | #endif |
07b54c9a JP |
217 | } else { |
218 | struct atm_iobuf __user *iobuf = arg; | |
219 | iobuf_len = &iobuf->length; | |
220 | if (get_user(buf, &iobuf->buffer)) | |
1da177e4 | 221 | return -EFAULT; |
07b54c9a JP |
222 | } |
223 | if (get_user(len, iobuf_len)) | |
224 | return -EFAULT; | |
225 | mutex_lock(&atm_dev_mutex); | |
226 | list_for_each(p, &atm_devs) | |
227 | size += sizeof(int); | |
228 | if (size > len) { | |
57b47a53 | 229 | mutex_unlock(&atm_dev_mutex); |
07b54c9a JP |
230 | return -E2BIG; |
231 | } | |
232 | tmp_buf = kmalloc(size, GFP_ATOMIC); | |
233 | if (!tmp_buf) { | |
234 | mutex_unlock(&atm_dev_mutex); | |
235 | return -ENOMEM; | |
236 | } | |
237 | tmp_p = tmp_buf; | |
238 | list_for_each(p, &atm_devs) { | |
239 | dev = list_entry(p, struct atm_dev, dev_list); | |
240 | *tmp_p++ = dev->number; | |
241 | } | |
242 | mutex_unlock(&atm_dev_mutex); | |
243 | error = ((copy_to_user(buf, tmp_buf, size)) || | |
244 | put_user(size, iobuf_len)) | |
245 | ? -EFAULT : 0; | |
246 | kfree(tmp_buf); | |
247 | return error; | |
248 | default: | |
249 | break; | |
1da177e4 LT |
250 | } |
251 | ||
f9d19a74 | 252 | if (IS_ENABLED(CONFIG_COMPAT) && compat) { |
8865c418 DW |
253 | #ifdef CONFIG_COMPAT |
254 | struct compat_atmif_sioc __user *csioc = arg; | |
255 | compat_uptr_t carg; | |
256 | ||
257 | sioc_len = &csioc->length; | |
258 | if (get_user(carg, &csioc->arg)) | |
259 | return -EFAULT; | |
260 | buf = compat_ptr(carg); | |
261 | ||
262 | if (get_user(len, &csioc->length)) | |
263 | return -EFAULT; | |
264 | if (get_user(number, &csioc->number)) | |
265 | return -EFAULT; | |
266 | #endif | |
267 | } else { | |
268 | struct atmif_sioc __user *sioc = arg; | |
269 | ||
270 | sioc_len = &sioc->length; | |
271 | if (get_user(buf, &sioc->arg)) | |
272 | return -EFAULT; | |
273 | if (get_user(len, &sioc->length)) | |
274 | return -EFAULT; | |
275 | if (get_user(number, &sioc->number)) | |
276 | return -EFAULT; | |
277 | } | |
07b54c9a JP |
278 | |
279 | dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d", | |
280 | number); | |
281 | if (!dev) | |
1da177e4 | 282 | return -ENODEV; |
f7d57453 | 283 | |
1da177e4 | 284 | switch (cmd) { |
07b54c9a JP |
285 | case ATM_GETTYPE: |
286 | size = strlen(dev->type) + 1; | |
287 | if (copy_to_user(buf, dev->type, size)) { | |
288 | error = -EFAULT; | |
289 | goto done; | |
290 | } | |
291 | break; | |
292 | case ATM_GETESI: | |
293 | size = ESI_LEN; | |
294 | if (copy_to_user(buf, dev->esi, size)) { | |
295 | error = -EFAULT; | |
296 | goto done; | |
297 | } | |
298 | break; | |
299 | case ATM_SETESI: | |
300 | { | |
301 | int i; | |
302 | ||
303 | for (i = 0; i < ESI_LEN; i++) | |
304 | if (dev->esi[i]) { | |
305 | error = -EEXIST; | |
1da177e4 LT |
306 | goto done; |
307 | } | |
07b54c9a JP |
308 | } |
309 | /* fall through */ | |
310 | case ATM_SETESIF: | |
311 | { | |
312 | unsigned char esi[ESI_LEN]; | |
313 | ||
314 | if (!capable(CAP_NET_ADMIN)) { | |
315 | error = -EPERM; | |
316 | goto done; | |
317 | } | |
318 | if (copy_from_user(esi, buf, ESI_LEN)) { | |
319 | error = -EFAULT; | |
320 | goto done; | |
321 | } | |
322 | memcpy(dev->esi, esi, ESI_LEN); | |
323 | error = ESI_LEN; | |
324 | goto done; | |
325 | } | |
326 | case ATM_GETSTATZ: | |
327 | if (!capable(CAP_NET_ADMIN)) { | |
328 | error = -EPERM; | |
329 | goto done; | |
330 | } | |
331 | /* fall through */ | |
332 | case ATM_GETSTAT: | |
333 | size = sizeof(struct atm_dev_stats); | |
334 | error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ); | |
335 | if (error) | |
336 | goto done; | |
337 | break; | |
338 | case ATM_GETCIRANGE: | |
339 | size = sizeof(struct atm_cirange); | |
340 | if (copy_to_user(buf, &dev->ci_range, size)) { | |
341 | error = -EFAULT; | |
342 | goto done; | |
343 | } | |
344 | break; | |
345 | case ATM_GETLINKRATE: | |
346 | size = sizeof(int); | |
347 | if (copy_to_user(buf, &dev->link_rate, size)) { | |
348 | error = -EFAULT; | |
349 | goto done; | |
350 | } | |
351 | break; | |
352 | case ATM_RSTADDR: | |
353 | if (!capable(CAP_NET_ADMIN)) { | |
354 | error = -EPERM; | |
355 | goto done; | |
356 | } | |
357 | atm_reset_addr(dev, ATM_ADDR_LOCAL); | |
358 | break; | |
359 | case ATM_ADDADDR: | |
360 | case ATM_DELADDR: | |
361 | case ATM_ADDLECSADDR: | |
362 | case ATM_DELLECSADDR: | |
363 | { | |
364 | struct sockaddr_atmsvc addr; | |
365 | ||
366 | if (!capable(CAP_NET_ADMIN)) { | |
367 | error = -EPERM; | |
368 | goto done; | |
369 | } | |
370 | ||
371 | if (copy_from_user(&addr, buf, sizeof(addr))) { | |
372 | error = -EFAULT; | |
373 | goto done; | |
374 | } | |
375 | if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR) | |
376 | error = atm_add_addr(dev, &addr, | |
377 | (cmd == ATM_ADDADDR ? | |
0f21ba7c | 378 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); |
07b54c9a JP |
379 | else |
380 | error = atm_del_addr(dev, &addr, | |
381 | (cmd == ATM_DELADDR ? | |
382 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
383 | goto done; | |
384 | } | |
385 | case ATM_GETADDR: | |
386 | case ATM_GETLECSADDR: | |
387 | error = atm_get_addr(dev, buf, len, | |
388 | (cmd == ATM_GETADDR ? | |
389 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
390 | if (error < 0) | |
391 | goto done; | |
392 | size = error; | |
393 | /* may return 0, but later on size == 0 means "don't | |
394 | write the length" */ | |
395 | error = put_user(size, sioc_len) ? -EFAULT : 0; | |
396 | goto done; | |
397 | case ATM_SETLOOP: | |
398 | if (__ATM_LM_XTRMT((int) (unsigned long) buf) && | |
399 | __ATM_LM_XTLOC((int) (unsigned long) buf) > | |
400 | __ATM_LM_XTRMT((int) (unsigned long) buf)) { | |
401 | error = -EINVAL; | |
1da177e4 | 402 | goto done; |
07b54c9a JP |
403 | } |
404 | /* fall through */ | |
405 | case ATM_SETCIRANGE: | |
406 | case SONET_GETSTATZ: | |
407 | case SONET_SETDIAG: | |
408 | case SONET_CLRDIAG: | |
409 | case SONET_SETFRAMING: | |
410 | if (!capable(CAP_NET_ADMIN)) { | |
411 | error = -EPERM; | |
412 | goto done; | |
413 | } | |
414 | /* fall through */ | |
415 | default: | |
0805a4b8 | 416 | if (IS_ENABLED(CONFIG_COMPAT) && compat) { |
07b54c9a JP |
417 | #ifdef CONFIG_COMPAT |
418 | if (!dev->ops->compat_ioctl) { | |
1da177e4 LT |
419 | error = -EINVAL; |
420 | goto done; | |
421 | } | |
07b54c9a | 422 | size = dev->ops->compat_ioctl(dev, cmd, buf); |
8865c418 | 423 | #endif |
07b54c9a JP |
424 | } else { |
425 | if (!dev->ops->ioctl) { | |
426 | error = -EINVAL; | |
1da177e4 LT |
427 | goto done; |
428 | } | |
07b54c9a JP |
429 | size = dev->ops->ioctl(dev, cmd, buf); |
430 | } | |
431 | if (size < 0) { | |
4a2c2406 | 432 | error = (size == -ENOIOCTLCMD ? -ENOTTY : size); |
07b54c9a JP |
433 | goto done; |
434 | } | |
1da177e4 | 435 | } |
f7d57453 | 436 | |
1da177e4 | 437 | if (size) |
07b54c9a | 438 | error = put_user(size, sioc_len) ? -EFAULT : 0; |
1da177e4 LT |
439 | else |
440 | error = 0; | |
441 | done: | |
442 | atm_dev_put(dev); | |
443 | return error; | |
444 | } | |
445 | ||
1da177e4 LT |
446 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) |
447 | { | |
f7d57453 | 448 | mutex_lock(&atm_dev_mutex); |
67de7924 | 449 | return seq_list_start_head(&atm_devs, *pos); |
1da177e4 LT |
450 | } |
451 | ||
452 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | |
453 | { | |
f7d57453 | 454 | mutex_unlock(&atm_dev_mutex); |
1da177e4 | 455 | } |
f7d57453 | 456 | |
1da177e4 LT |
457 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
458 | { | |
67de7924 | 459 | return seq_list_next(v, &atm_devs, pos); |
1da177e4 | 460 | } |