Commit | Line | Data |
---|---|---|
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 | 21 | #include <linux/mutex.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
57b47a53 | 23 | |
1da177e4 LT |
24 | #include <net/sock.h> /* for struct sock */ |
25 | ||
26 | #include "common.h" | |
27 | #include "resources.h" | |
28 | #include "addr.h" | |
29 | ||
30 | ||
31 | LIST_HEAD(atm_devs); | |
57b47a53 | 32 | DEFINE_MUTEX(atm_dev_mutex); |
1da177e4 LT |
33 | |
34 | static struct atm_dev *__alloc_atm_dev(const char *type) | |
35 | { | |
36 | struct atm_dev *dev; | |
37 | ||
0da974f4 | 38 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
39 | if (!dev) |
40 | return NULL; | |
1da177e4 LT |
41 | 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); | |
0f21ba7c | 46 | INIT_LIST_HEAD(&dev->lecs); |
1da177e4 LT |
47 | |
48 | return dev; | |
49 | } | |
50 | ||
1da177e4 LT |
51 | static 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); | |
aaaaaadb | 58 | if (dev->number == number) { |
1da177e4 LT |
59 | atm_dev_hold(dev); |
60 | return dev; | |
61 | } | |
62 | } | |
63 | return NULL; | |
64 | } | |
65 | ||
66 | struct atm_dev *atm_dev_lookup(int number) | |
67 | { | |
68 | struct atm_dev *dev; | |
69 | ||
57b47a53 | 70 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 71 | dev = __atm_dev_lookup(number); |
57b47a53 | 72 | mutex_unlock(&atm_dev_mutex); |
1da177e4 LT |
73 | return dev; |
74 | } | |
07b54c9a | 75 | EXPORT_SYMBOL(atm_dev_lookup); |
64bf69dd | 76 | |
1da177e4 LT |
77 | struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops, |
78 | int number, unsigned long *flags) | |
79 | { | |
80 | struct atm_dev *dev, *inuse; | |
81 | ||
82 | dev = __alloc_atm_dev(type); | |
83 | if (!dev) { | |
99824461 | 84 | pr_err("no space for dev %s\n", type); |
1da177e4 LT |
85 | return NULL; |
86 | } | |
57b47a53 | 87 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 88 | if (number != -1) { |
07b54c9a JP |
89 | inuse = __atm_dev_lookup(number); |
90 | if (inuse) { | |
1da177e4 | 91 | atm_dev_put(inuse); |
57b47a53 | 92 | mutex_unlock(&atm_dev_mutex); |
ebc37b61 | 93 | kfree(dev); |
1da177e4 LT |
94 | return NULL; |
95 | } | |
96 | dev->number = number; | |
97 | } else { | |
98 | dev->number = 0; | |
99 | while ((inuse = __atm_dev_lookup(dev->number))) { | |
100 | atm_dev_put(inuse); | |
101 | dev->number++; | |
102 | } | |
103 | } | |
104 | ||
105 | dev->ops = ops; | |
106 | if (flags) | |
107 | dev->flags = *flags; | |
108 | else | |
109 | memset(&dev->flags, 0, sizeof(dev->flags)); | |
110 | memset(&dev->stats, 0, sizeof(dev->stats)); | |
111 | atomic_set(&dev->refcnt, 1); | |
1da177e4 LT |
112 | |
113 | if (atm_proc_dev_register(dev) < 0) { | |
99824461 | 114 | pr_err("atm_proc_dev_register failed for dev %s\n", type); |
656d98b0 RK |
115 | goto out_fail; |
116 | } | |
117 | ||
118 | if (atm_register_sysfs(dev) < 0) { | |
99824461 | 119 | pr_err("atm_register_sysfs failed for dev %s\n", type); |
656d98b0 RK |
120 | atm_proc_dev_deregister(dev); |
121 | goto out_fail; | |
1da177e4 | 122 | } |
656d98b0 | 123 | |
aaaaaadb | 124 | list_add_tail(&dev->dev_list, &atm_devs); |
1da177e4 | 125 | |
656d98b0 RK |
126 | out: |
127 | mutex_unlock(&atm_dev_mutex); | |
1da177e4 | 128 | return dev; |
656d98b0 RK |
129 | |
130 | out_fail: | |
131 | kfree(dev); | |
132 | dev = NULL; | |
133 | goto out; | |
1da177e4 | 134 | } |
07b54c9a | 135 | EXPORT_SYMBOL(atm_dev_register); |
1da177e4 LT |
136 | |
137 | void atm_dev_deregister(struct atm_dev *dev) | |
138 | { | |
64bf69dd SG |
139 | BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags)); |
140 | set_bit(ATM_DF_REMOVED, &dev->flags); | |
141 | ||
142 | /* | |
f7d57453 YH |
143 | * if we remove current device from atm_devs list, new device |
144 | * with same number can appear, such we need deregister proc, | |
64bf69dd SG |
145 | * release async all vccs and remove them from vccs list too |
146 | */ | |
57b47a53 | 147 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 148 | list_del(&dev->dev_list); |
57b47a53 | 149 | mutex_unlock(&atm_dev_mutex); |
1da177e4 | 150 | |
64bf69dd | 151 | atm_dev_release_vccs(dev); |
656d98b0 | 152 | atm_unregister_sysfs(dev); |
64bf69dd | 153 | atm_proc_dev_deregister(dev); |
1da177e4 | 154 | |
64bf69dd | 155 | atm_dev_put(dev); |
1da177e4 | 156 | } |
07b54c9a | 157 | EXPORT_SYMBOL(atm_dev_deregister); |
1da177e4 LT |
158 | |
159 | static void copy_aal_stats(struct k_atm_aal_stats *from, | |
160 | struct atm_aal_stats *to) | |
161 | { | |
162 | #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i) | |
163 | __AAL_STAT_ITEMS | |
164 | #undef __HANDLE_ITEM | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static void subtract_aal_stats(struct k_atm_aal_stats *from, |
168 | struct atm_aal_stats *to) | |
169 | { | |
170 | #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) | |
171 | __AAL_STAT_ITEMS | |
172 | #undef __HANDLE_ITEM | |
173 | } | |
174 | ||
07b54c9a JP |
175 | static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, |
176 | int zero) | |
1da177e4 LT |
177 | { |
178 | struct atm_dev_stats tmp; | |
179 | int error = 0; | |
180 | ||
181 | copy_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
182 | copy_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
183 | copy_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
184 | if (arg) | |
185 | error = copy_to_user(arg, &tmp, sizeof(tmp)); | |
186 | if (zero && !error) { | |
187 | subtract_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
188 | subtract_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
189 | subtract_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
190 | } | |
191 | return error ? -EFAULT : 0; | |
192 | } | |
193 | ||
8865c418 | 194 | int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat) |
1da177e4 LT |
195 | { |
196 | void __user *buf; | |
197 | int error, len, number, size = 0; | |
198 | struct atm_dev *dev; | |
199 | struct list_head *p; | |
200 | int *tmp_buf, *tmp_p; | |
8865c418 DW |
201 | int __user *sioc_len; |
202 | int __user *iobuf_len; | |
203 | ||
204 | #ifndef CONFIG_COMPAT | |
205 | compat = 0; /* Just so the compiler _knows_ */ | |
206 | #endif | |
207 | ||
1da177e4 | 208 | switch (cmd) { |
07b54c9a JP |
209 | case ATM_GETNAMES: |
210 | if (compat) { | |
8865c418 | 211 | #ifdef CONFIG_COMPAT |
07b54c9a JP |
212 | struct compat_atm_iobuf __user *ciobuf = arg; |
213 | compat_uptr_t cbuf; | |
214 | iobuf_len = &ciobuf->length; | |
215 | if (get_user(cbuf, &ciobuf->buffer)) | |
216 | return -EFAULT; | |
217 | buf = compat_ptr(cbuf); | |
8865c418 | 218 | #endif |
07b54c9a JP |
219 | } else { |
220 | struct atm_iobuf __user *iobuf = arg; | |
221 | iobuf_len = &iobuf->length; | |
222 | if (get_user(buf, &iobuf->buffer)) | |
1da177e4 | 223 | return -EFAULT; |
07b54c9a JP |
224 | } |
225 | if (get_user(len, iobuf_len)) | |
226 | return -EFAULT; | |
227 | mutex_lock(&atm_dev_mutex); | |
228 | list_for_each(p, &atm_devs) | |
229 | size += sizeof(int); | |
230 | if (size > len) { | |
57b47a53 | 231 | mutex_unlock(&atm_dev_mutex); |
07b54c9a JP |
232 | return -E2BIG; |
233 | } | |
234 | tmp_buf = kmalloc(size, GFP_ATOMIC); | |
235 | if (!tmp_buf) { | |
236 | mutex_unlock(&atm_dev_mutex); | |
237 | return -ENOMEM; | |
238 | } | |
239 | tmp_p = tmp_buf; | |
240 | list_for_each(p, &atm_devs) { | |
241 | dev = list_entry(p, struct atm_dev, dev_list); | |
242 | *tmp_p++ = dev->number; | |
243 | } | |
244 | mutex_unlock(&atm_dev_mutex); | |
245 | error = ((copy_to_user(buf, tmp_buf, size)) || | |
246 | put_user(size, iobuf_len)) | |
247 | ? -EFAULT : 0; | |
248 | kfree(tmp_buf); | |
249 | return error; | |
250 | default: | |
251 | break; | |
1da177e4 LT |
252 | } |
253 | ||
8865c418 DW |
254 | if (compat) { |
255 | #ifdef CONFIG_COMPAT | |
256 | struct compat_atmif_sioc __user *csioc = arg; | |
257 | compat_uptr_t carg; | |
258 | ||
259 | sioc_len = &csioc->length; | |
260 | if (get_user(carg, &csioc->arg)) | |
261 | return -EFAULT; | |
262 | buf = compat_ptr(carg); | |
263 | ||
264 | if (get_user(len, &csioc->length)) | |
265 | return -EFAULT; | |
266 | if (get_user(number, &csioc->number)) | |
267 | return -EFAULT; | |
268 | #endif | |
269 | } else { | |
270 | struct atmif_sioc __user *sioc = arg; | |
271 | ||
272 | sioc_len = &sioc->length; | |
273 | if (get_user(buf, &sioc->arg)) | |
274 | return -EFAULT; | |
275 | if (get_user(len, &sioc->length)) | |
276 | return -EFAULT; | |
277 | if (get_user(number, &sioc->number)) | |
278 | return -EFAULT; | |
279 | } | |
07b54c9a JP |
280 | |
281 | dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d", | |
282 | number); | |
283 | if (!dev) | |
1da177e4 | 284 | return -ENODEV; |
f7d57453 | 285 | |
1da177e4 | 286 | switch (cmd) { |
07b54c9a JP |
287 | case ATM_GETTYPE: |
288 | size = strlen(dev->type) + 1; | |
289 | if (copy_to_user(buf, dev->type, size)) { | |
290 | error = -EFAULT; | |
291 | goto done; | |
292 | } | |
293 | break; | |
294 | case ATM_GETESI: | |
295 | size = ESI_LEN; | |
296 | if (copy_to_user(buf, dev->esi, size)) { | |
297 | error = -EFAULT; | |
298 | goto done; | |
299 | } | |
300 | break; | |
301 | case ATM_SETESI: | |
302 | { | |
303 | int i; | |
304 | ||
305 | for (i = 0; i < ESI_LEN; i++) | |
306 | if (dev->esi[i]) { | |
307 | error = -EEXIST; | |
1da177e4 LT |
308 | goto done; |
309 | } | |
07b54c9a JP |
310 | } |
311 | /* fall through */ | |
312 | case ATM_SETESIF: | |
313 | { | |
314 | unsigned char esi[ESI_LEN]; | |
315 | ||
316 | if (!capable(CAP_NET_ADMIN)) { | |
317 | error = -EPERM; | |
318 | goto done; | |
319 | } | |
320 | if (copy_from_user(esi, buf, ESI_LEN)) { | |
321 | error = -EFAULT; | |
322 | goto done; | |
323 | } | |
324 | memcpy(dev->esi, esi, ESI_LEN); | |
325 | error = ESI_LEN; | |
326 | goto done; | |
327 | } | |
328 | case ATM_GETSTATZ: | |
329 | if (!capable(CAP_NET_ADMIN)) { | |
330 | error = -EPERM; | |
331 | goto done; | |
332 | } | |
333 | /* fall through */ | |
334 | case ATM_GETSTAT: | |
335 | size = sizeof(struct atm_dev_stats); | |
336 | error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ); | |
337 | if (error) | |
338 | goto done; | |
339 | break; | |
340 | case ATM_GETCIRANGE: | |
341 | size = sizeof(struct atm_cirange); | |
342 | if (copy_to_user(buf, &dev->ci_range, size)) { | |
343 | error = -EFAULT; | |
344 | goto done; | |
345 | } | |
346 | break; | |
347 | case ATM_GETLINKRATE: | |
348 | size = sizeof(int); | |
349 | if (copy_to_user(buf, &dev->link_rate, size)) { | |
350 | error = -EFAULT; | |
351 | goto done; | |
352 | } | |
353 | break; | |
354 | case ATM_RSTADDR: | |
355 | if (!capable(CAP_NET_ADMIN)) { | |
356 | error = -EPERM; | |
357 | goto done; | |
358 | } | |
359 | atm_reset_addr(dev, ATM_ADDR_LOCAL); | |
360 | break; | |
361 | case ATM_ADDADDR: | |
362 | case ATM_DELADDR: | |
363 | case ATM_ADDLECSADDR: | |
364 | case ATM_DELLECSADDR: | |
365 | { | |
366 | struct sockaddr_atmsvc addr; | |
367 | ||
368 | if (!capable(CAP_NET_ADMIN)) { | |
369 | error = -EPERM; | |
370 | goto done; | |
371 | } | |
372 | ||
373 | if (copy_from_user(&addr, buf, sizeof(addr))) { | |
374 | error = -EFAULT; | |
375 | goto done; | |
376 | } | |
377 | if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR) | |
378 | error = atm_add_addr(dev, &addr, | |
379 | (cmd == ATM_ADDADDR ? | |
0f21ba7c | 380 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); |
07b54c9a JP |
381 | else |
382 | error = atm_del_addr(dev, &addr, | |
383 | (cmd == ATM_DELADDR ? | |
384 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
385 | goto done; | |
386 | } | |
387 | case ATM_GETADDR: | |
388 | case ATM_GETLECSADDR: | |
389 | error = atm_get_addr(dev, buf, len, | |
390 | (cmd == ATM_GETADDR ? | |
391 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
392 | if (error < 0) | |
393 | goto done; | |
394 | size = error; | |
395 | /* may return 0, but later on size == 0 means "don't | |
396 | write the length" */ | |
397 | error = put_user(size, sioc_len) ? -EFAULT : 0; | |
398 | goto done; | |
399 | case ATM_SETLOOP: | |
400 | if (__ATM_LM_XTRMT((int) (unsigned long) buf) && | |
401 | __ATM_LM_XTLOC((int) (unsigned long) buf) > | |
402 | __ATM_LM_XTRMT((int) (unsigned long) buf)) { | |
403 | error = -EINVAL; | |
1da177e4 | 404 | goto done; |
07b54c9a JP |
405 | } |
406 | /* fall through */ | |
407 | case ATM_SETCIRANGE: | |
408 | case SONET_GETSTATZ: | |
409 | case SONET_SETDIAG: | |
410 | case SONET_CLRDIAG: | |
411 | case SONET_SETFRAMING: | |
412 | if (!capable(CAP_NET_ADMIN)) { | |
413 | error = -EPERM; | |
414 | goto done; | |
415 | } | |
416 | /* fall through */ | |
417 | default: | |
418 | if (compat) { | |
419 | #ifdef CONFIG_COMPAT | |
420 | if (!dev->ops->compat_ioctl) { | |
1da177e4 LT |
421 | error = -EINVAL; |
422 | goto done; | |
423 | } | |
07b54c9a | 424 | size = dev->ops->compat_ioctl(dev, cmd, buf); |
8865c418 | 425 | #endif |
07b54c9a JP |
426 | } else { |
427 | if (!dev->ops->ioctl) { | |
428 | error = -EINVAL; | |
1da177e4 LT |
429 | goto done; |
430 | } | |
07b54c9a JP |
431 | size = dev->ops->ioctl(dev, cmd, buf); |
432 | } | |
433 | if (size < 0) { | |
434 | error = (size == -ENOIOCTLCMD ? -EINVAL : size); | |
435 | goto done; | |
436 | } | |
1da177e4 | 437 | } |
f7d57453 | 438 | |
1da177e4 | 439 | if (size) |
07b54c9a | 440 | error = put_user(size, sioc_len) ? -EFAULT : 0; |
1da177e4 LT |
441 | else |
442 | error = 0; | |
443 | done: | |
444 | atm_dev_put(dev); | |
445 | return error; | |
446 | } | |
447 | ||
1da177e4 LT |
448 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) |
449 | { | |
f7d57453 | 450 | mutex_lock(&atm_dev_mutex); |
67de7924 | 451 | return seq_list_start_head(&atm_devs, *pos); |
1da177e4 LT |
452 | } |
453 | ||
454 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | |
455 | { | |
f7d57453 | 456 | mutex_unlock(&atm_dev_mutex); |
1da177e4 | 457 | } |
f7d57453 | 458 | |
1da177e4 LT |
459 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
460 | { | |
67de7924 | 461 | return seq_list_next(v, &atm_devs, pos); |
1da177e4 | 462 | } |