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> | |
19 | #include <linux/delay.h> | |
20 | #include <net/sock.h> /* for struct sock */ | |
21 | ||
22 | #include "common.h" | |
23 | #include "resources.h" | |
24 | #include "addr.h" | |
25 | ||
26 | ||
27 | LIST_HEAD(atm_devs); | |
aaaaaadb | 28 | DECLARE_MUTEX(atm_dev_mutex); |
1da177e4 LT |
29 | |
30 | static struct atm_dev *__alloc_atm_dev(const char *type) | |
31 | { | |
32 | struct atm_dev *dev; | |
33 | ||
34 | dev = kmalloc(sizeof(*dev), GFP_KERNEL); | |
35 | if (!dev) | |
36 | return NULL; | |
37 | memset(dev, 0, sizeof(*dev)); | |
38 | dev->type = type; | |
39 | dev->signal = ATM_PHY_SIG_UNKNOWN; | |
40 | dev->link_rate = ATM_OC3_PCR; | |
41 | spin_lock_init(&dev->lock); | |
42 | INIT_LIST_HEAD(&dev->local); | |
0f21ba7c | 43 | INIT_LIST_HEAD(&dev->lecs); |
1da177e4 LT |
44 | |
45 | return dev; | |
46 | } | |
47 | ||
1da177e4 LT |
48 | static struct atm_dev *__atm_dev_lookup(int number) |
49 | { | |
50 | struct atm_dev *dev; | |
51 | struct list_head *p; | |
52 | ||
53 | list_for_each(p, &atm_devs) { | |
54 | dev = list_entry(p, struct atm_dev, dev_list); | |
aaaaaadb | 55 | if (dev->number == number) { |
1da177e4 LT |
56 | atm_dev_hold(dev); |
57 | return dev; | |
58 | } | |
59 | } | |
60 | return NULL; | |
61 | } | |
62 | ||
63 | struct atm_dev *atm_dev_lookup(int number) | |
64 | { | |
65 | struct atm_dev *dev; | |
66 | ||
aaaaaadb | 67 | down(&atm_dev_mutex); |
1da177e4 | 68 | dev = __atm_dev_lookup(number); |
aaaaaadb | 69 | up(&atm_dev_mutex); |
1da177e4 LT |
70 | return dev; |
71 | } | |
72 | ||
64bf69dd | 73 | |
1da177e4 LT |
74 | struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops, |
75 | int number, unsigned long *flags) | |
76 | { | |
77 | struct atm_dev *dev, *inuse; | |
78 | ||
79 | dev = __alloc_atm_dev(type); | |
80 | if (!dev) { | |
81 | printk(KERN_ERR "atm_dev_register: no space for dev %s\n", | |
82 | type); | |
83 | return NULL; | |
84 | } | |
aaaaaadb | 85 | down(&atm_dev_mutex); |
1da177e4 LT |
86 | if (number != -1) { |
87 | if ((inuse = __atm_dev_lookup(number))) { | |
88 | atm_dev_put(inuse); | |
aaaaaadb | 89 | up(&atm_dev_mutex); |
ebc37b61 | 90 | kfree(dev); |
1da177e4 LT |
91 | return NULL; |
92 | } | |
93 | dev->number = number; | |
94 | } else { | |
95 | dev->number = 0; | |
96 | while ((inuse = __atm_dev_lookup(dev->number))) { | |
97 | atm_dev_put(inuse); | |
98 | dev->number++; | |
99 | } | |
100 | } | |
101 | ||
102 | dev->ops = ops; | |
103 | if (flags) | |
104 | dev->flags = *flags; | |
105 | else | |
106 | memset(&dev->flags, 0, sizeof(dev->flags)); | |
107 | memset(&dev->stats, 0, sizeof(dev->stats)); | |
108 | atomic_set(&dev->refcnt, 1); | |
1da177e4 LT |
109 | |
110 | if (atm_proc_dev_register(dev) < 0) { | |
111 | printk(KERN_ERR "atm_dev_register: " | |
112 | "atm_proc_dev_register failed for dev %s\n", | |
113 | type); | |
aaaaaadb | 114 | up(&atm_dev_mutex); |
ebc37b61 | 115 | kfree(dev); |
1da177e4 LT |
116 | return NULL; |
117 | } | |
aaaaaadb SG |
118 | list_add_tail(&dev->dev_list, &atm_devs); |
119 | up(&atm_dev_mutex); | |
1da177e4 LT |
120 | |
121 | return dev; | |
122 | } | |
123 | ||
124 | ||
125 | void atm_dev_deregister(struct atm_dev *dev) | |
126 | { | |
64bf69dd SG |
127 | BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags)); |
128 | set_bit(ATM_DF_REMOVED, &dev->flags); | |
129 | ||
130 | /* | |
131 | * if we remove current device from atm_devs list, new device | |
132 | * with same number can appear, such we need deregister proc, | |
133 | * release async all vccs and remove them from vccs list too | |
134 | */ | |
aaaaaadb | 135 | down(&atm_dev_mutex); |
1da177e4 | 136 | list_del(&dev->dev_list); |
aaaaaadb | 137 | up(&atm_dev_mutex); |
1da177e4 | 138 | |
64bf69dd SG |
139 | atm_dev_release_vccs(dev); |
140 | atm_proc_dev_deregister(dev); | |
1da177e4 | 141 | |
64bf69dd | 142 | atm_dev_put(dev); |
1da177e4 LT |
143 | } |
144 | ||
145 | ||
146 | static void copy_aal_stats(struct k_atm_aal_stats *from, | |
147 | struct atm_aal_stats *to) | |
148 | { | |
149 | #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i) | |
150 | __AAL_STAT_ITEMS | |
151 | #undef __HANDLE_ITEM | |
152 | } | |
153 | ||
154 | ||
155 | static void subtract_aal_stats(struct k_atm_aal_stats *from, | |
156 | struct atm_aal_stats *to) | |
157 | { | |
158 | #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i) | |
159 | __AAL_STAT_ITEMS | |
160 | #undef __HANDLE_ITEM | |
161 | } | |
162 | ||
163 | ||
164 | static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero) | |
165 | { | |
166 | struct atm_dev_stats tmp; | |
167 | int error = 0; | |
168 | ||
169 | copy_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
170 | copy_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
171 | copy_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
172 | if (arg) | |
173 | error = copy_to_user(arg, &tmp, sizeof(tmp)); | |
174 | if (zero && !error) { | |
175 | subtract_aal_stats(&dev->stats.aal0, &tmp.aal0); | |
176 | subtract_aal_stats(&dev->stats.aal34, &tmp.aal34); | |
177 | subtract_aal_stats(&dev->stats.aal5, &tmp.aal5); | |
178 | } | |
179 | return error ? -EFAULT : 0; | |
180 | } | |
181 | ||
182 | ||
183 | int atm_dev_ioctl(unsigned int cmd, void __user *arg) | |
184 | { | |
185 | void __user *buf; | |
186 | int error, len, number, size = 0; | |
187 | struct atm_dev *dev; | |
188 | struct list_head *p; | |
189 | int *tmp_buf, *tmp_p; | |
190 | struct atm_iobuf __user *iobuf = arg; | |
191 | struct atmif_sioc __user *sioc = arg; | |
192 | switch (cmd) { | |
193 | case ATM_GETNAMES: | |
194 | if (get_user(buf, &iobuf->buffer)) | |
195 | return -EFAULT; | |
196 | if (get_user(len, &iobuf->length)) | |
197 | return -EFAULT; | |
aaaaaadb | 198 | down(&atm_dev_mutex); |
1da177e4 LT |
199 | list_for_each(p, &atm_devs) |
200 | size += sizeof(int); | |
201 | if (size > len) { | |
aaaaaadb | 202 | up(&atm_dev_mutex); |
1da177e4 LT |
203 | return -E2BIG; |
204 | } | |
205 | tmp_buf = kmalloc(size, GFP_ATOMIC); | |
206 | if (!tmp_buf) { | |
aaaaaadb | 207 | up(&atm_dev_mutex); |
1da177e4 LT |
208 | return -ENOMEM; |
209 | } | |
210 | tmp_p = tmp_buf; | |
211 | list_for_each(p, &atm_devs) { | |
212 | dev = list_entry(p, struct atm_dev, dev_list); | |
213 | *tmp_p++ = dev->number; | |
214 | } | |
aaaaaadb | 215 | up(&atm_dev_mutex); |
1da177e4 LT |
216 | error = ((copy_to_user(buf, tmp_buf, size)) || |
217 | put_user(size, &iobuf->length)) | |
218 | ? -EFAULT : 0; | |
219 | kfree(tmp_buf); | |
220 | return error; | |
221 | default: | |
222 | break; | |
223 | } | |
224 | ||
225 | if (get_user(buf, &sioc->arg)) | |
226 | return -EFAULT; | |
227 | if (get_user(len, &sioc->length)) | |
228 | return -EFAULT; | |
229 | if (get_user(number, &sioc->number)) | |
230 | return -EFAULT; | |
231 | ||
50accc9c MBJ |
232 | if (!(dev = try_then_request_module(atm_dev_lookup(number), |
233 | "atm-device-%d", number))) | |
1da177e4 LT |
234 | return -ENODEV; |
235 | ||
236 | switch (cmd) { | |
237 | case ATM_GETTYPE: | |
238 | size = strlen(dev->type) + 1; | |
239 | if (copy_to_user(buf, dev->type, size)) { | |
240 | error = -EFAULT; | |
241 | goto done; | |
242 | } | |
243 | break; | |
244 | case ATM_GETESI: | |
245 | size = ESI_LEN; | |
246 | if (copy_to_user(buf, dev->esi, size)) { | |
247 | error = -EFAULT; | |
248 | goto done; | |
249 | } | |
250 | break; | |
251 | case ATM_SETESI: | |
252 | { | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < ESI_LEN; i++) | |
256 | if (dev->esi[i]) { | |
257 | error = -EEXIST; | |
258 | goto done; | |
259 | } | |
260 | } | |
261 | /* fall through */ | |
262 | case ATM_SETESIF: | |
263 | { | |
264 | unsigned char esi[ESI_LEN]; | |
265 | ||
266 | if (!capable(CAP_NET_ADMIN)) { | |
267 | error = -EPERM; | |
268 | goto done; | |
269 | } | |
270 | if (copy_from_user(esi, buf, ESI_LEN)) { | |
271 | error = -EFAULT; | |
272 | goto done; | |
273 | } | |
274 | memcpy(dev->esi, esi, ESI_LEN); | |
275 | error = ESI_LEN; | |
276 | goto done; | |
277 | } | |
278 | case ATM_GETSTATZ: | |
279 | if (!capable(CAP_NET_ADMIN)) { | |
280 | error = -EPERM; | |
281 | goto done; | |
282 | } | |
283 | /* fall through */ | |
284 | case ATM_GETSTAT: | |
285 | size = sizeof(struct atm_dev_stats); | |
286 | error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ); | |
287 | if (error) | |
288 | goto done; | |
289 | break; | |
290 | case ATM_GETCIRANGE: | |
291 | size = sizeof(struct atm_cirange); | |
292 | if (copy_to_user(buf, &dev->ci_range, size)) { | |
293 | error = -EFAULT; | |
294 | goto done; | |
295 | } | |
296 | break; | |
297 | case ATM_GETLINKRATE: | |
298 | size = sizeof(int); | |
299 | if (copy_to_user(buf, &dev->link_rate, size)) { | |
300 | error = -EFAULT; | |
301 | goto done; | |
302 | } | |
303 | break; | |
304 | case ATM_RSTADDR: | |
305 | if (!capable(CAP_NET_ADMIN)) { | |
306 | error = -EPERM; | |
307 | goto done; | |
308 | } | |
0f21ba7c | 309 | atm_reset_addr(dev, ATM_ADDR_LOCAL); |
1da177e4 LT |
310 | break; |
311 | case ATM_ADDADDR: | |
312 | case ATM_DELADDR: | |
0f21ba7c EK |
313 | case ATM_ADDLECSADDR: |
314 | case ATM_DELLECSADDR: | |
1da177e4 LT |
315 | if (!capable(CAP_NET_ADMIN)) { |
316 | error = -EPERM; | |
317 | goto done; | |
318 | } | |
319 | { | |
320 | struct sockaddr_atmsvc addr; | |
321 | ||
322 | if (copy_from_user(&addr, buf, sizeof(addr))) { | |
323 | error = -EFAULT; | |
324 | goto done; | |
325 | } | |
0f21ba7c EK |
326 | if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR) |
327 | error = atm_add_addr(dev, &addr, | |
328 | (cmd == ATM_ADDADDR ? | |
329 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 | 330 | else |
0f21ba7c EK |
331 | error = atm_del_addr(dev, &addr, |
332 | (cmd == ATM_DELADDR ? | |
333 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 LT |
334 | goto done; |
335 | } | |
336 | case ATM_GETADDR: | |
0f21ba7c EK |
337 | case ATM_GETLECSADDR: |
338 | error = atm_get_addr(dev, buf, len, | |
339 | (cmd == ATM_GETADDR ? | |
340 | ATM_ADDR_LOCAL : ATM_ADDR_LECS)); | |
1da177e4 LT |
341 | if (error < 0) |
342 | goto done; | |
343 | size = error; | |
344 | /* may return 0, but later on size == 0 means "don't | |
345 | write the length" */ | |
346 | error = put_user(size, &sioc->length) | |
347 | ? -EFAULT : 0; | |
348 | goto done; | |
349 | case ATM_SETLOOP: | |
350 | if (__ATM_LM_XTRMT((int) (unsigned long) buf) && | |
351 | __ATM_LM_XTLOC((int) (unsigned long) buf) > | |
352 | __ATM_LM_XTRMT((int) (unsigned long) buf)) { | |
353 | error = -EINVAL; | |
354 | goto done; | |
355 | } | |
356 | /* fall through */ | |
357 | case ATM_SETCIRANGE: | |
358 | case SONET_GETSTATZ: | |
359 | case SONET_SETDIAG: | |
360 | case SONET_CLRDIAG: | |
361 | case SONET_SETFRAMING: | |
362 | if (!capable(CAP_NET_ADMIN)) { | |
363 | error = -EPERM; | |
364 | goto done; | |
365 | } | |
366 | /* fall through */ | |
367 | default: | |
368 | if (!dev->ops->ioctl) { | |
369 | error = -EINVAL; | |
370 | goto done; | |
371 | } | |
372 | size = dev->ops->ioctl(dev, cmd, buf); | |
373 | if (size < 0) { | |
374 | error = (size == -ENOIOCTLCMD ? -EINVAL : size); | |
375 | goto done; | |
376 | } | |
377 | } | |
378 | ||
379 | if (size) | |
380 | error = put_user(size, &sioc->length) | |
381 | ? -EFAULT : 0; | |
382 | else | |
383 | error = 0; | |
384 | done: | |
385 | atm_dev_put(dev); | |
386 | return error; | |
387 | } | |
388 | ||
389 | static __inline__ void *dev_get_idx(loff_t left) | |
390 | { | |
391 | struct list_head *p; | |
392 | ||
393 | list_for_each(p, &atm_devs) { | |
394 | if (!--left) | |
395 | break; | |
396 | } | |
397 | return (p != &atm_devs) ? p : NULL; | |
398 | } | |
399 | ||
400 | void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos) | |
401 | { | |
aaaaaadb | 402 | down(&atm_dev_mutex); |
1da177e4 LT |
403 | return *pos ? dev_get_idx(*pos) : (void *) 1; |
404 | } | |
405 | ||
406 | void atm_dev_seq_stop(struct seq_file *seq, void *v) | |
407 | { | |
aaaaaadb | 408 | up(&atm_dev_mutex); |
1da177e4 LT |
409 | } |
410 | ||
411 | void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
412 | { | |
413 | ++*pos; | |
414 | v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next; | |
415 | return (v == &atm_devs) ? NULL : v; | |
416 | } | |
417 | ||
418 | ||
419 | EXPORT_SYMBOL(atm_dev_register); | |
420 | EXPORT_SYMBOL(atm_dev_deregister); | |
421 | EXPORT_SYMBOL(atm_dev_lookup); |