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 | ||
11 | #include <linux/config.h> | |
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 LT |
20 | #include <linux/delay.h> |
21 | #include <net/sock.h> /* for struct sock */ | |
22 | ||
23 | #include "common.h" | |
24 | #include "resources.h" | |
25 | #include "addr.h" | |
26 | ||
27 | ||
28 | LIST_HEAD(atm_devs); | |
aaaaaadb | 29 | DECLARE_MUTEX(atm_dev_mutex); |
1da177e4 LT |
30 | |
31 | static struct atm_dev *__alloc_atm_dev(const char *type) | |
32 | { | |
33 | struct atm_dev *dev; | |
34 | ||
35 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
36 | if (!dev) | |
37 | return NULL; | |
38 | memset(dev, 0, sizeof(*dev)); | |
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 | ||
aaaaaadb | 68 | down(&atm_dev_mutex); |
1da177e4 | 69 | dev = __atm_dev_lookup(number); |
aaaaaadb | 70 | up(&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 | } | |
aaaaaadb | 86 | down(&atm_dev_mutex); |
1da177e4 LT |
87 | if (number != -1) { |
88 | if ((inuse = __atm_dev_lookup(number))) { | |
89 | atm_dev_put(inuse); | |
aaaaaadb | 90 | up(&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); | |
aaaaaadb | 115 | up(&atm_dev_mutex); |
ebc37b61 | 116 | kfree(dev); |
1da177e4 LT |
117 | return NULL; |
118 | } | |
aaaaaadb SG |
119 | list_add_tail(&dev->dev_list, &atm_devs); |
120 | up(&atm_dev_mutex); | |
1da177e4 LT |
121 | |
122 | return dev; | |
123 | } | |
124 | ||
125 | ||
126 | void atm_dev_deregister(struct atm_dev *dev) | |
127 | { | |
64bf69dd SG |
128 | BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags)); |
129 | set_bit(ATM_DF_REMOVED, &dev->flags); | |
130 | ||
131 | /* | |
132 | * if we remove current device from atm_devs list, new device | |
133 | * with same number can appear, such we need deregister proc, | |
134 | * release async all vccs and remove them from vccs list too | |
135 | */ | |
aaaaaadb | 136 | down(&atm_dev_mutex); |
1da177e4 | 137 | list_del(&dev->dev_list); |
aaaaaadb | 138 | up(&atm_dev_mutex); |
1da177e4 | 139 | |
64bf69dd SG |
140 | atm_dev_release_vccs(dev); |
141 | atm_proc_dev_deregister(dev); | |
1da177e4 | 142 | |
64bf69dd | 143 | atm_dev_put(dev); |
1da177e4 LT |
144 | } |
145 | ||
146 | ||
147 | static void copy_aal_stats(struct k_atm_aal_stats *from, | |
148 | struct atm_aal_stats *to) | |
149 | { | |
150 | #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i) | |
151 | __AAL_STAT_ITEMS | |
152 | #undef __HANDLE_ITEM | |
153 | } | |
154 | ||
155 | ||
156 | static void subtract_aal_stats(struct k_atm_aal_stats *from, | |
157 | struct atm_aal_stats *to) | |
158 | { | |
159 | #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) | |
160 | __AAL_STAT_ITEMS | |
161 | #undef __HANDLE_ITEM | |
162 | } | |
163 | ||
164 | ||
165 | static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero) | |
166 | { | |
167 | struct atm_dev_stats tmp; | |
168 | int error = 0; | |
169 | ||
170 | copy_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
171 | copy_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
172 | copy_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
173 | if (arg) | |
174 | error = copy_to_user(arg, &tmp, sizeof(tmp)); | |
175 | if (zero && !error) { | |
176 | subtract_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
177 | subtract_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
178 | subtract_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
179 | } | |
180 | return error ? -EFAULT : 0; | |
181 | } | |
182 | ||
183 | ||
184 | int atm_dev_ioctl(unsigned int cmd, void __user *arg) | |
185 | { | |
186 | void __user *buf; | |
187 | int error, len, number, size = 0; | |
188 | struct atm_dev *dev; | |
189 | struct list_head *p; | |
190 | int *tmp_buf, *tmp_p; | |
191 | struct atm_iobuf __user *iobuf = arg; | |
192 | struct atmif_sioc __user *sioc = arg; | |
193 | switch (cmd) { | |
194 | case ATM_GETNAMES: | |
195 | if (get_user(buf, &iobuf->buffer)) | |
196 | return -EFAULT; | |
197 | if (get_user(len, &iobuf->length)) | |
198 | return -EFAULT; | |
aaaaaadb | 199 | down(&atm_dev_mutex); |
1da177e4 LT |
200 | list_for_each(p, &atm_devs) |
201 | size += sizeof(int); | |
202 | if (size > len) { | |
aaaaaadb | 203 | up(&atm_dev_mutex); |
1da177e4 LT |
204 | return -E2BIG; |
205 | } | |
206 | tmp_buf = kmalloc(size, GFP_ATOMIC); | |
207 | if (!tmp_buf) { | |
aaaaaadb | 208 | up(&atm_dev_mutex); |
1da177e4 LT |
209 | return -ENOMEM; |
210 | } | |
211 | tmp_p = tmp_buf; | |
212 | list_for_each(p, &atm_devs) { | |
213 | dev = list_entry(p, struct atm_dev, dev_list); | |
214 | *tmp_p++ = dev->number; | |
215 | } | |
aaaaaadb | 216 | up(&atm_dev_mutex); |
1da177e4 LT |
217 | error = ((copy_to_user(buf, tmp_buf, size)) || |
218 | put_user(size, &iobuf->length)) | |
219 | ? -EFAULT : 0; | |
220 | kfree(tmp_buf); | |
221 | return error; | |
222 | default: | |
223 | break; | |
224 | } | |
225 | ||
226 | if (get_user(buf, &sioc->arg)) | |
227 | return -EFAULT; | |
228 | if (get_user(len, &sioc->length)) | |
229 | return -EFAULT; | |
230 | if (get_user(number, &sioc->number)) | |
231 | return -EFAULT; | |
232 | ||
50accc9c MBJ |
233 | if (!(dev = try_then_request_module(atm_dev_lookup(number), |
234 | "atm-device-%d", number))) | |
1da177e4 LT |
235 | return -ENODEV; |
236 | ||
237 | switch (cmd) { | |
238 | case ATM_GETTYPE: | |
239 | size = strlen(dev->type) + 1; | |
240 | if (copy_to_user(buf, dev->type, size)) { | |
241 | error = -EFAULT; | |
242 | goto done; | |
243 | } | |
244 | break; | |
245 | case ATM_GETESI: | |
246 | size = ESI_LEN; | |
247 | if (copy_to_user(buf, dev->esi, size)) { | |
248 | error = -EFAULT; | |
249 | goto done; | |
250 | } | |
251 | break; | |
252 | case ATM_SETESI: | |
253 | { | |
254 | int i; | |
255 | ||
256 | for (i = 0; i < ESI_LEN; i++) | |
257 | if (dev->esi[i]) { | |
258 | error = -EEXIST; | |
259 | goto done; | |
260 | } | |
261 | } | |
262 | /* fall through */ | |
263 | case ATM_SETESIF: | |
264 | { | |
265 | unsigned char esi[ESI_LEN]; | |
266 | ||
267 | if (!capable(CAP_NET_ADMIN)) { | |
268 | error = -EPERM; | |
269 | goto done; | |
270 | } | |
271 | if (copy_from_user(esi, buf, ESI_LEN)) { | |
272 | error = -EFAULT; | |
273 | goto done; | |
274 | } | |
275 | memcpy(dev->esi, esi, ESI_LEN); | |
276 | error = ESI_LEN; | |
277 | goto done; | |
278 | } | |
279 | case ATM_GETSTATZ: | |
280 | if (!capable(CAP_NET_ADMIN)) { | |
281 | error = -EPERM; | |
282 | goto done; | |
283 | } | |
284 | /* fall through */ | |
285 | case ATM_GETSTAT: | |
286 | size = sizeof(struct atm_dev_stats); | |
287 | error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ); | |
288 | if (error) | |
289 | goto done; | |
290 | break; | |
291 | case ATM_GETCIRANGE: | |
292 | size = sizeof(struct atm_cirange); | |
293 | if (copy_to_user(buf, &dev->ci_range, size)) { | |
294 | error = -EFAULT; | |
295 | goto done; | |
296 | } | |
297 | break; | |
298 | case ATM_GETLINKRATE: | |
299 | size = sizeof(int); | |
300 | if (copy_to_user(buf, &dev->link_rate, size)) { | |
301 | error = -EFAULT; | |
302 | goto done; | |
303 | } | |
304 | break; | |
305 | case ATM_RSTADDR: | |
306 | if (!capable(CAP_NET_ADMIN)) { | |
307 | error = -EPERM; | |
308 | goto done; | |
309 | } | |
0f21ba7c | 310 | atm_reset_addr(dev, ATM_ADDR_LOCAL); |
1da177e4 LT |
311 | break; |
312 | case ATM_ADDADDR: | |
313 | case ATM_DELADDR: | |
0f21ba7c EK |
314 | case ATM_ADDLECSADDR: |
315 | case ATM_DELLECSADDR: | |
1da177e4 LT |
316 | if (!capable(CAP_NET_ADMIN)) { |
317 | error = -EPERM; | |
318 | goto done; | |
319 | } | |
320 | { | |
321 | struct sockaddr_atmsvc addr; | |
322 | ||
323 | if (copy_from_user(&addr, buf, sizeof(addr))) { | |
324 | error = -EFAULT; | |
325 | goto done; | |
326 | } | |
0f21ba7c EK |
327 | if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR) |
328 | error = atm_add_addr(dev, &addr, | |
329 | (cmd == ATM_ADDADDR ? | |
330 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 | 331 | else |
0f21ba7c EK |
332 | error = atm_del_addr(dev, &addr, |
333 | (cmd == ATM_DELADDR ? | |
334 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 LT |
335 | goto done; |
336 | } | |
337 | case ATM_GETADDR: | |
0f21ba7c EK |
338 | case ATM_GETLECSADDR: |
339 | error = atm_get_addr(dev, buf, len, | |
340 | (cmd == ATM_GETADDR ? | |
341 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 LT |
342 | if (error < 0) |
343 | goto done; | |
344 | size = error; | |
345 | /* may return 0, but later on size == 0 means "don't | |
346 | write the length" */ | |
347 | error = put_user(size, &sioc->length) | |
348 | ? -EFAULT : 0; | |
349 | goto done; | |
350 | case ATM_SETLOOP: | |
351 | if (__ATM_LM_XTRMT((int) (unsigned long) buf) && | |
352 | __ATM_LM_XTLOC((int) (unsigned long) buf) > | |
353 | __ATM_LM_XTRMT((int) (unsigned long) buf)) { | |
354 | error = -EINVAL; | |
355 | goto done; | |
356 | } | |
357 | /* fall through */ | |
358 | case ATM_SETCIRANGE: | |
359 | case SONET_GETSTATZ: | |
360 | case SONET_SETDIAG: | |
361 | case SONET_CLRDIAG: | |
362 | case SONET_SETFRAMING: | |
363 | if (!capable(CAP_NET_ADMIN)) { | |
364 | error = -EPERM; | |
365 | goto done; | |
366 | } | |
367 | /* fall through */ | |
368 | default: | |
369 | if (!dev->ops->ioctl) { | |
370 | error = -EINVAL; | |
371 | goto done; | |
372 | } | |
373 | size = dev->ops->ioctl(dev, cmd, buf); | |
374 | if (size < 0) { | |
375 | error = (size == -ENOIOCTLCMD ? -EINVAL : size); | |
376 | goto done; | |
377 | } | |
378 | } | |
379 | ||
380 | if (size) | |
381 | error = put_user(size, &sioc->length) | |
382 | ? -EFAULT : 0; | |
383 | else | |
384 | error = 0; | |
385 | done: | |
386 | atm_dev_put(dev); | |
387 | return error; | |
388 | } | |
389 | ||
390 | static __inline__ void *dev_get_idx(loff_t left) | |
391 | { | |
392 | struct list_head *p; | |
393 | ||
394 | list_for_each(p, &atm_devs) { | |
395 | if (!--left) | |
396 | break; | |
397 | } | |
398 | return (p != &atm_devs) ? p : NULL; | |
399 | } | |
400 | ||
401 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) | |
402 | { | |
aaaaaadb | 403 | down(&atm_dev_mutex); |
1da177e4 LT |
404 | return *pos ? dev_get_idx(*pos) : (void *) 1; |
405 | } | |
406 | ||
407 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | |
408 | { | |
aaaaaadb | 409 | up(&atm_dev_mutex); |
1da177e4 LT |
410 | } |
411 | ||
412 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
413 | { | |
414 | ++*pos; | |
415 | v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next; | |
416 | return (v == &atm_devs) ? NULL : v; | |
417 | } | |
418 | ||
419 | ||
420 | EXPORT_SYMBOL(atm_dev_register); | |
421 | EXPORT_SYMBOL(atm_dev_deregister); | |
422 | EXPORT_SYMBOL(atm_dev_lookup); |