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 | ||
10 | ||
1da177e4 LT |
11 | #include <linux/ctype.h> |
12 | #include <linux/string.h> | |
13 | #include <linux/atmdev.h> | |
14 | #include <linux/sonet.h> | |
15 | #include <linux/kernel.h> /* for barrier */ | |
16 | #include <linux/module.h> | |
17 | #include <linux/bitops.h> | |
4fc268d2 | 18 | #include <linux/capability.h> |
1da177e4 | 19 | #include <linux/delay.h> |
57b47a53 IM |
20 | #include <linux/mutex.h> |
21 | ||
1da177e4 LT |
22 | #include <net/sock.h> /* for struct sock */ |
23 | ||
24 | #include "common.h" | |
25 | #include "resources.h" | |
26 | #include "addr.h" | |
27 | ||
28 | ||
29 | LIST_HEAD(atm_devs); | |
57b47a53 | 30 | DEFINE_MUTEX(atm_dev_mutex); |
1da177e4 LT |
31 | |
32 | static struct atm_dev *__alloc_atm_dev(const char *type) | |
33 | { | |
34 | struct atm_dev *dev; | |
35 | ||
0da974f4 | 36 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
37 | if (!dev) |
38 | return NULL; | |
1da177e4 LT |
39 | dev->type = type; |
40 | dev->signal = ATM_PHY_SIG_UNKNOWN; | |
41 | dev->link_rate = ATM_OC3_PCR; | |
42 | spin_lock_init(&dev->lock); | |
43 | INIT_LIST_HEAD(&dev->local); | |
0f21ba7c | 44 | INIT_LIST_HEAD(&dev->lecs); |
1da177e4 LT |
45 | |
46 | return dev; | |
47 | } | |
48 | ||
1da177e4 LT |
49 | static struct atm_dev *__atm_dev_lookup(int number) |
50 | { | |
51 | struct atm_dev *dev; | |
52 | struct list_head *p; | |
53 | ||
54 | list_for_each(p, &atm_devs) { | |
55 | dev = list_entry(p, struct atm_dev, dev_list); | |
aaaaaadb | 56 | if (dev->number == number) { |
1da177e4 LT |
57 | atm_dev_hold(dev); |
58 | return dev; | |
59 | } | |
60 | } | |
61 | return NULL; | |
62 | } | |
63 | ||
64 | struct atm_dev *atm_dev_lookup(int number) | |
65 | { | |
66 | struct atm_dev *dev; | |
67 | ||
57b47a53 | 68 | mutex_lock(&atm_dev_mutex); |
1da177e4 | 69 | dev = __atm_dev_lookup(number); |
57b47a53 | 70 | mutex_unlock(&atm_dev_mutex); |
1da177e4 LT |
71 | return dev; |
72 | } | |
73 | ||
64bf69dd | 74 | |
1da177e4 LT |
75 | struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops, |
76 | int number, unsigned long *flags) | |
77 | { | |
78 | struct atm_dev *dev, *inuse; | |
79 | ||
80 | dev = __alloc_atm_dev(type); | |
81 | if (!dev) { | |
82 | printk(KERN_ERR "atm_dev_register: no space for dev %s\n", | |
83 | type); | |
84 | return NULL; | |
85 | } | |
57b47a53 | 86 | mutex_lock(&atm_dev_mutex); |
1da177e4 LT |
87 | if (number != -1) { |
88 | if ((inuse = __atm_dev_lookup(number))) { | |
89 | atm_dev_put(inuse); | |
57b47a53 | 90 | mutex_unlock(&atm_dev_mutex); |
ebc37b61 | 91 | kfree(dev); |
1da177e4 LT |
92 | return NULL; |
93 | } | |
94 | dev->number = number; | |
95 | } else { | |
96 | dev->number = 0; | |
97 | while ((inuse = __atm_dev_lookup(dev->number))) { | |
98 | atm_dev_put(inuse); | |
99 | dev->number++; | |
100 | } | |
101 | } | |
102 | ||
103 | dev->ops = ops; | |
104 | if (flags) | |
105 | dev->flags = *flags; | |
106 | else | |
107 | memset(&dev->flags, 0, sizeof(dev->flags)); | |
108 | memset(&dev->stats, 0, sizeof(dev->stats)); | |
109 | atomic_set(&dev->refcnt, 1); | |
1da177e4 LT |
110 | |
111 | if (atm_proc_dev_register(dev) < 0) { | |
112 | printk(KERN_ERR "atm_dev_register: " | |
113 | "atm_proc_dev_register failed for dev %s\n", | |
114 | type); | |
656d98b0 RK |
115 | goto out_fail; |
116 | } | |
117 | ||
118 | if (atm_register_sysfs(dev) < 0) { | |
119 | printk(KERN_ERR "atm_dev_register: " | |
120 | "atm_register_sysfs failed for dev %s\n", | |
121 | type); | |
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 LT |
136 | } |
137 | ||
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 LT |
158 | } |
159 | ||
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 | ||
169 | ||
170 | static void subtract_aal_stats(struct k_atm_aal_stats *from, | |
171 | struct atm_aal_stats *to) | |
172 | { | |
173 | #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) | |
174 | __AAL_STAT_ITEMS | |
175 | #undef __HANDLE_ITEM | |
176 | } | |
177 | ||
178 | ||
179 | static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero) | |
180 | { | |
181 | struct atm_dev_stats tmp; | |
182 | int error = 0; | |
183 | ||
184 | copy_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
185 | copy_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
186 | copy_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
187 | if (arg) | |
188 | error = copy_to_user(arg, &tmp, sizeof(tmp)); | |
189 | if (zero && !error) { | |
190 | subtract_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
191 | subtract_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
192 | subtract_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
193 | } | |
194 | return error ? -EFAULT : 0; | |
195 | } | |
196 | ||
197 | ||
8865c418 | 198 | int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat) |
1da177e4 LT |
199 | { |
200 | void __user *buf; | |
201 | int error, len, number, size = 0; | |
202 | struct atm_dev *dev; | |
203 | struct list_head *p; | |
204 | int *tmp_buf, *tmp_p; | |
8865c418 DW |
205 | int __user *sioc_len; |
206 | int __user *iobuf_len; | |
207 | ||
208 | #ifndef CONFIG_COMPAT | |
209 | compat = 0; /* Just so the compiler _knows_ */ | |
210 | #endif | |
211 | ||
1da177e4 LT |
212 | switch (cmd) { |
213 | case ATM_GETNAMES: | |
8865c418 DW |
214 | |
215 | if (compat) { | |
216 | #ifdef CONFIG_COMPAT | |
217 | struct compat_atm_iobuf __user *ciobuf = arg; | |
218 | compat_uptr_t cbuf; | |
219 | iobuf_len = &ciobuf->length; | |
220 | if (get_user(cbuf, &ciobuf->buffer)) | |
221 | return -EFAULT; | |
222 | buf = compat_ptr(cbuf); | |
223 | #endif | |
224 | } else { | |
225 | struct atm_iobuf __user *iobuf = arg; | |
226 | iobuf_len = &iobuf->length; | |
227 | if (get_user(buf, &iobuf->buffer)) | |
228 | return -EFAULT; | |
229 | } | |
230 | if (get_user(len, iobuf_len)) | |
1da177e4 | 231 | return -EFAULT; |
57b47a53 | 232 | mutex_lock(&atm_dev_mutex); |
1da177e4 LT |
233 | list_for_each(p, &atm_devs) |
234 | size += sizeof(int); | |
235 | if (size > len) { | |
57b47a53 | 236 | mutex_unlock(&atm_dev_mutex); |
1da177e4 LT |
237 | return -E2BIG; |
238 | } | |
239 | tmp_buf = kmalloc(size, GFP_ATOMIC); | |
240 | if (!tmp_buf) { | |
57b47a53 | 241 | mutex_unlock(&atm_dev_mutex); |
1da177e4 LT |
242 | return -ENOMEM; |
243 | } | |
244 | tmp_p = tmp_buf; | |
245 | list_for_each(p, &atm_devs) { | |
246 | dev = list_entry(p, struct atm_dev, dev_list); | |
247 | *tmp_p++ = dev->number; | |
248 | } | |
57b47a53 | 249 | mutex_unlock(&atm_dev_mutex); |
f7d57453 | 250 | error = ((copy_to_user(buf, tmp_buf, size)) || |
8865c418 | 251 | put_user(size, iobuf_len)) |
1da177e4 LT |
252 | ? -EFAULT : 0; |
253 | kfree(tmp_buf); | |
254 | return error; | |
255 | default: | |
256 | break; | |
257 | } | |
258 | ||
8865c418 DW |
259 | if (compat) { |
260 | #ifdef CONFIG_COMPAT | |
261 | struct compat_atmif_sioc __user *csioc = arg; | |
262 | compat_uptr_t carg; | |
263 | ||
264 | sioc_len = &csioc->length; | |
265 | if (get_user(carg, &csioc->arg)) | |
266 | return -EFAULT; | |
267 | buf = compat_ptr(carg); | |
268 | ||
269 | if (get_user(len, &csioc->length)) | |
270 | return -EFAULT; | |
271 | if (get_user(number, &csioc->number)) | |
272 | return -EFAULT; | |
273 | #endif | |
274 | } else { | |
275 | struct atmif_sioc __user *sioc = arg; | |
276 | ||
277 | sioc_len = &sioc->length; | |
278 | if (get_user(buf, &sioc->arg)) | |
279 | return -EFAULT; | |
280 | if (get_user(len, &sioc->length)) | |
281 | return -EFAULT; | |
282 | if (get_user(number, &sioc->number)) | |
283 | return -EFAULT; | |
284 | } | |
50accc9c MBJ |
285 | if (!(dev = try_then_request_module(atm_dev_lookup(number), |
286 | "atm-device-%d", number))) | |
1da177e4 | 287 | return -ENODEV; |
f7d57453 | 288 | |
1da177e4 LT |
289 | switch (cmd) { |
290 | case ATM_GETTYPE: | |
291 | size = strlen(dev->type) + 1; | |
292 | if (copy_to_user(buf, dev->type, size)) { | |
293 | error = -EFAULT; | |
294 | goto done; | |
295 | } | |
296 | break; | |
297 | case ATM_GETESI: | |
298 | size = ESI_LEN; | |
299 | if (copy_to_user(buf, dev->esi, size)) { | |
300 | error = -EFAULT; | |
301 | goto done; | |
302 | } | |
303 | break; | |
304 | case ATM_SETESI: | |
305 | { | |
306 | int i; | |
307 | ||
308 | for (i = 0; i < ESI_LEN; i++) | |
309 | if (dev->esi[i]) { | |
310 | error = -EEXIST; | |
311 | goto done; | |
312 | } | |
313 | } | |
314 | /* fall through */ | |
315 | case ATM_SETESIF: | |
316 | { | |
317 | unsigned char esi[ESI_LEN]; | |
318 | ||
319 | if (!capable(CAP_NET_ADMIN)) { | |
320 | error = -EPERM; | |
321 | goto done; | |
322 | } | |
323 | if (copy_from_user(esi, buf, ESI_LEN)) { | |
324 | error = -EFAULT; | |
325 | goto done; | |
326 | } | |
327 | memcpy(dev->esi, esi, ESI_LEN); | |
328 | error = ESI_LEN; | |
329 | goto done; | |
330 | } | |
331 | case ATM_GETSTATZ: | |
332 | if (!capable(CAP_NET_ADMIN)) { | |
333 | error = -EPERM; | |
334 | goto done; | |
335 | } | |
336 | /* fall through */ | |
337 | case ATM_GETSTAT: | |
338 | size = sizeof(struct atm_dev_stats); | |
339 | error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ); | |
340 | if (error) | |
341 | goto done; | |
342 | break; | |
343 | case ATM_GETCIRANGE: | |
344 | size = sizeof(struct atm_cirange); | |
345 | if (copy_to_user(buf, &dev->ci_range, size)) { | |
346 | error = -EFAULT; | |
347 | goto done; | |
348 | } | |
349 | break; | |
350 | case ATM_GETLINKRATE: | |
351 | size = sizeof(int); | |
352 | if (copy_to_user(buf, &dev->link_rate, size)) { | |
353 | error = -EFAULT; | |
354 | goto done; | |
355 | } | |
356 | break; | |
357 | case ATM_RSTADDR: | |
358 | if (!capable(CAP_NET_ADMIN)) { | |
359 | error = -EPERM; | |
360 | goto done; | |
361 | } | |
0f21ba7c | 362 | atm_reset_addr(dev, ATM_ADDR_LOCAL); |
1da177e4 LT |
363 | break; |
364 | case ATM_ADDADDR: | |
365 | case ATM_DELADDR: | |
0f21ba7c EK |
366 | case ATM_ADDLECSADDR: |
367 | case ATM_DELLECSADDR: | |
1da177e4 LT |
368 | if (!capable(CAP_NET_ADMIN)) { |
369 | error = -EPERM; | |
370 | goto done; | |
371 | } | |
372 | { | |
373 | struct sockaddr_atmsvc addr; | |
374 | ||
375 | if (copy_from_user(&addr, buf, sizeof(addr))) { | |
376 | error = -EFAULT; | |
377 | goto done; | |
378 | } | |
0f21ba7c EK |
379 | if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR) |
380 | error = atm_add_addr(dev, &addr, | |
381 | (cmd == ATM_ADDADDR ? | |
382 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 | 383 | else |
0f21ba7c EK |
384 | error = atm_del_addr(dev, &addr, |
385 | (cmd == ATM_DELADDR ? | |
386 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 LT |
387 | goto done; |
388 | } | |
389 | case ATM_GETADDR: | |
0f21ba7c EK |
390 | case ATM_GETLECSADDR: |
391 | error = atm_get_addr(dev, buf, len, | |
392 | (cmd == ATM_GETADDR ? | |
393 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 LT |
394 | if (error < 0) |
395 | goto done; | |
396 | size = error; | |
397 | /* may return 0, but later on size == 0 means "don't | |
398 | write the length" */ | |
8865c418 | 399 | error = put_user(size, sioc_len) |
1da177e4 LT |
400 | ? -EFAULT : 0; |
401 | goto done; | |
402 | case ATM_SETLOOP: | |
403 | if (__ATM_LM_XTRMT((int) (unsigned long) buf) && | |
404 | __ATM_LM_XTLOC((int) (unsigned long) buf) > | |
405 | __ATM_LM_XTRMT((int) (unsigned long) buf)) { | |
406 | error = -EINVAL; | |
407 | goto done; | |
408 | } | |
409 | /* fall through */ | |
410 | case ATM_SETCIRANGE: | |
411 | case SONET_GETSTATZ: | |
412 | case SONET_SETDIAG: | |
413 | case SONET_CLRDIAG: | |
414 | case SONET_SETFRAMING: | |
415 | if (!capable(CAP_NET_ADMIN)) { | |
416 | error = -EPERM; | |
417 | goto done; | |
418 | } | |
419 | /* fall through */ | |
420 | default: | |
8865c418 DW |
421 | if (compat) { |
422 | #ifdef CONFIG_COMPAT | |
423 | if (!dev->ops->compat_ioctl) { | |
424 | error = -EINVAL; | |
425 | goto done; | |
426 | } | |
427 | size = dev->ops->compat_ioctl(dev, cmd, buf); | |
428 | #endif | |
429 | } else { | |
430 | if (!dev->ops->ioctl) { | |
431 | error = -EINVAL; | |
432 | goto done; | |
433 | } | |
434 | size = dev->ops->ioctl(dev, cmd, buf); | |
1da177e4 | 435 | } |
1da177e4 LT |
436 | if (size < 0) { |
437 | error = (size == -ENOIOCTLCMD ? -EINVAL : size); | |
438 | goto done; | |
439 | } | |
440 | } | |
f7d57453 | 441 | |
1da177e4 | 442 | if (size) |
8865c418 | 443 | error = put_user(size, sioc_len) |
1da177e4 LT |
444 | ? -EFAULT : 0; |
445 | else | |
446 | error = 0; | |
447 | done: | |
448 | atm_dev_put(dev); | |
449 | return error; | |
450 | } | |
451 | ||
452 | static __inline__ void *dev_get_idx(loff_t left) | |
453 | { | |
454 | struct list_head *p; | |
455 | ||
456 | list_for_each(p, &atm_devs) { | |
457 | if (!--left) | |
458 | break; | |
459 | } | |
460 | return (p != &atm_devs) ? p : NULL; | |
461 | } | |
462 | ||
463 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) | |
464 | { | |
f7d57453 | 465 | mutex_lock(&atm_dev_mutex); |
2e1e9848 | 466 | return *pos ? dev_get_idx(*pos) : SEQ_START_TOKEN; |
1da177e4 LT |
467 | } |
468 | ||
469 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | |
470 | { | |
f7d57453 | 471 | mutex_unlock(&atm_dev_mutex); |
1da177e4 | 472 | } |
f7d57453 | 473 | |
1da177e4 LT |
474 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
475 | { | |
476 | ++*pos; | |
2e1e9848 JP |
477 | v = (v == SEQ_START_TOKEN) |
478 | ? atm_devs.next : ((struct list_head *)v)->next; | |
1da177e4 LT |
479 | return (v == &atm_devs) ? NULL : v; |
480 | } | |
481 | ||
482 | ||
483 | EXPORT_SYMBOL(atm_dev_register); | |
484 | EXPORT_SYMBOL(atm_dev_deregister); | |
485 | EXPORT_SYMBOL(atm_dev_lookup); |