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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 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ | |
11 | ||
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> | |
19 | #include <linux/capability.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/slab.h> | |
23 | ||
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); | |
32 | DEFINE_MUTEX(atm_dev_mutex); | |
33 | ||
34 | static struct atm_dev *__alloc_atm_dev(const char *type) | |
35 | { | |
36 | struct atm_dev *dev; | |
37 | ||
38 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
39 | if (!dev) | |
40 | return NULL; | |
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); | |
46 | INIT_LIST_HEAD(&dev->lecs); | |
47 | ||
48 | return dev; | |
49 | } | |
50 | ||
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); | |
58 | if (dev->number == number) { | |
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 | ||
70 | mutex_lock(&atm_dev_mutex); | |
71 | dev = __atm_dev_lookup(number); | |
72 | mutex_unlock(&atm_dev_mutex); | |
73 | return dev; | |
74 | } | |
75 | EXPORT_SYMBOL(atm_dev_lookup); | |
76 | ||
77 | struct atm_dev *atm_dev_register(const char *type, struct device *parent, | |
78 | const struct atmdev_ops *ops, int number, | |
79 | unsigned long *flags) | |
80 | { | |
81 | struct atm_dev *dev, *inuse; | |
82 | ||
83 | dev = __alloc_atm_dev(type); | |
84 | if (!dev) { | |
85 | pr_err("no space for dev %s\n", type); | |
86 | return NULL; | |
87 | } | |
88 | mutex_lock(&atm_dev_mutex); | |
89 | if (number != -1) { | |
90 | inuse = __atm_dev_lookup(number); | |
91 | if (inuse) { | |
92 | atm_dev_put(inuse); | |
93 | mutex_unlock(&atm_dev_mutex); | |
94 | kfree(dev); | |
95 | 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); | |
113 | ||
114 | if (atm_proc_dev_register(dev) < 0) { | |
115 | pr_err("atm_proc_dev_register failed for dev %s\n", type); | |
116 | goto out_fail; | |
117 | } | |
118 | ||
119 | if (atm_register_sysfs(dev, parent) < 0) { | |
120 | pr_err("atm_register_sysfs failed for dev %s\n", type); | |
121 | atm_proc_dev_deregister(dev); | |
122 | goto out_fail; | |
123 | } | |
124 | ||
125 | list_add_tail(&dev->dev_list, &atm_devs); | |
126 | ||
127 | out: | |
128 | mutex_unlock(&atm_dev_mutex); | |
129 | return dev; | |
130 | ||
131 | out_fail: | |
132 | kfree(dev); | |
133 | dev = NULL; | |
134 | goto out; | |
135 | } | |
136 | EXPORT_SYMBOL(atm_dev_register); | |
137 | ||
138 | void atm_dev_deregister(struct atm_dev *dev) | |
139 | { | |
140 | BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags)); | |
141 | set_bit(ATM_DF_REMOVED, &dev->flags); | |
142 | ||
143 | /* | |
144 | * if we remove current device from atm_devs list, new device | |
145 | * with same number can appear, such we need deregister proc, | |
146 | * release async all vccs and remove them from vccs list too | |
147 | */ | |
148 | mutex_lock(&atm_dev_mutex); | |
149 | list_del(&dev->dev_list); | |
150 | mutex_unlock(&atm_dev_mutex); | |
151 | ||
152 | atm_dev_release_vccs(dev); | |
153 | atm_unregister_sysfs(dev); | |
154 | atm_proc_dev_deregister(dev); | |
155 | ||
156 | atm_dev_put(dev); | |
157 | } | |
158 | EXPORT_SYMBOL(atm_dev_deregister); | |
159 | ||
160 | static 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 | ||
168 | static 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 | ||
176 | static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, | |
177 | int zero) | |
178 | { | |
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 | ||
195 | int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat) | |
196 | { | |
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; | |
202 | 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 | ||
209 | switch (cmd) { | |
210 | case ATM_GETNAMES: | |
211 | if (compat) { | |
212 | #ifdef CONFIG_COMPAT | |
213 | struct compat_atm_iobuf __user *ciobuf = arg; | |
214 | compat_uptr_t cbuf; | |
215 | iobuf_len = &ciobuf->length; | |
216 | if (get_user(cbuf, &ciobuf->buffer)) | |
217 | return -EFAULT; | |
218 | 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) { | |
232 | mutex_unlock(&atm_dev_mutex); | |
233 | 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; | |
253 | } | |
254 | ||
255 | if (compat) { | |
256 | #ifdef CONFIG_COMPAT | |
257 | struct compat_atmif_sioc __user *csioc = arg; | |
258 | compat_uptr_t carg; | |
259 | ||
260 | 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 | } | |
281 | ||
282 | dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d", | |
283 | number); | |
284 | if (!dev) | |
285 | return -ENODEV; | |
286 | ||
287 | switch (cmd) { | |
288 | case ATM_GETTYPE: | |
289 | size = strlen(dev->type) + 1; | |
290 | if (copy_to_user(buf, dev->type, size)) { | |
291 | error = -EFAULT; | |
292 | goto done; | |
293 | } | |
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; | |
309 | goto done; | |
310 | } | |
311 | } | |
312 | /* 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 ? -ENOTTY : size); | |
436 | goto done; | |
437 | } | |
438 | } | |
439 | ||
440 | if (size) | |
441 | error = put_user(size, sioc_len) ? -EFAULT : 0; | |
442 | else | |
443 | error = 0; | |
444 | done: | |
445 | atm_dev_put(dev); | |
446 | return error; | |
447 | } | |
448 | ||
449 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) | |
450 | { | |
451 | mutex_lock(&atm_dev_mutex); | |
452 | return seq_list_start_head(&atm_devs, *pos); | |
453 | } | |
454 | ||
455 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | |
456 | { | |
457 | mutex_unlock(&atm_dev_mutex); | |
458 | } | |
459 | ||
460 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
461 | { | |
462 | return seq_list_next(v, &atm_devs, pos); | |
463 | } |