[PATCH] w1: Userspace communication protocol over connector.
[linux-2.6/verdex.git] / net / atm / resources.c
blob18ac80698f835906cab6cd9f45971892ef42d46b
1 /* net/atm/resources.c - Statically allocated resources */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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 */
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/capability.h>
20 #include <linux/delay.h>
21 #include <linux/mutex.h>
23 #include <net/sock.h> /* for struct sock */
25 #include "common.h"
26 #include "resources.h"
27 #include "addr.h"
30 LIST_HEAD(atm_devs);
31 DEFINE_MUTEX(atm_dev_mutex);
33 static struct atm_dev *__alloc_atm_dev(const char *type)
35 struct atm_dev *dev;
37 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
38 if (!dev)
39 return NULL;
40 memset(dev, 0, sizeof(*dev));
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);
48 return dev;
51 static struct atm_dev *__atm_dev_lookup(int number)
53 struct atm_dev *dev;
54 struct list_head *p;
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;
63 return NULL;
66 struct atm_dev *atm_dev_lookup(int number)
68 struct atm_dev *dev;
70 mutex_lock(&atm_dev_mutex);
71 dev = __atm_dev_lookup(number);
72 mutex_unlock(&atm_dev_mutex);
73 return dev;
77 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
78 int number, unsigned long *flags)
80 struct atm_dev *dev, *inuse;
82 dev = __alloc_atm_dev(type);
83 if (!dev) {
84 printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
85 type);
86 return NULL;
88 mutex_lock(&atm_dev_mutex);
89 if (number != -1) {
90 if ((inuse = __atm_dev_lookup(number))) {
91 atm_dev_put(inuse);
92 mutex_unlock(&atm_dev_mutex);
93 kfree(dev);
94 return NULL;
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++;
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);
113 if (atm_proc_dev_register(dev) < 0) {
114 printk(KERN_ERR "atm_dev_register: "
115 "atm_proc_dev_register failed for dev %s\n",
116 type);
117 mutex_unlock(&atm_dev_mutex);
118 kfree(dev);
119 return NULL;
121 list_add_tail(&dev->dev_list, &atm_devs);
122 mutex_unlock(&atm_dev_mutex);
124 return dev;
128 void atm_dev_deregister(struct atm_dev *dev)
130 BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
131 set_bit(ATM_DF_REMOVED, &dev->flags);
134 * if we remove current device from atm_devs list, new device
135 * with same number can appear, such we need deregister proc,
136 * release async all vccs and remove them from vccs list too
138 mutex_lock(&atm_dev_mutex);
139 list_del(&dev->dev_list);
140 mutex_unlock(&atm_dev_mutex);
142 atm_dev_release_vccs(dev);
143 atm_proc_dev_deregister(dev);
145 atm_dev_put(dev);
149 static void copy_aal_stats(struct k_atm_aal_stats *from,
150 struct atm_aal_stats *to)
152 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
153 __AAL_STAT_ITEMS
154 #undef __HANDLE_ITEM
158 static void subtract_aal_stats(struct k_atm_aal_stats *from,
159 struct atm_aal_stats *to)
161 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
162 __AAL_STAT_ITEMS
163 #undef __HANDLE_ITEM
167 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
169 struct atm_dev_stats tmp;
170 int error = 0;
172 copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
173 copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
174 copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
175 if (arg)
176 error = copy_to_user(arg, &tmp, sizeof(tmp));
177 if (zero && !error) {
178 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
179 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
180 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
182 return error ? -EFAULT : 0;
186 int atm_dev_ioctl(unsigned int cmd, void __user *arg)
188 void __user *buf;
189 int error, len, number, size = 0;
190 struct atm_dev *dev;
191 struct list_head *p;
192 int *tmp_buf, *tmp_p;
193 struct atm_iobuf __user *iobuf = arg;
194 struct atmif_sioc __user *sioc = arg;
195 switch (cmd) {
196 case ATM_GETNAMES:
197 if (get_user(buf, &iobuf->buffer))
198 return -EFAULT;
199 if (get_user(len, &iobuf->length))
200 return -EFAULT;
201 mutex_lock(&atm_dev_mutex);
202 list_for_each(p, &atm_devs)
203 size += sizeof(int);
204 if (size > len) {
205 mutex_unlock(&atm_dev_mutex);
206 return -E2BIG;
208 tmp_buf = kmalloc(size, GFP_ATOMIC);
209 if (!tmp_buf) {
210 mutex_unlock(&atm_dev_mutex);
211 return -ENOMEM;
213 tmp_p = tmp_buf;
214 list_for_each(p, &atm_devs) {
215 dev = list_entry(p, struct atm_dev, dev_list);
216 *tmp_p++ = dev->number;
218 mutex_unlock(&atm_dev_mutex);
219 error = ((copy_to_user(buf, tmp_buf, size)) ||
220 put_user(size, &iobuf->length))
221 ? -EFAULT : 0;
222 kfree(tmp_buf);
223 return error;
224 default:
225 break;
228 if (get_user(buf, &sioc->arg))
229 return -EFAULT;
230 if (get_user(len, &sioc->length))
231 return -EFAULT;
232 if (get_user(number, &sioc->number))
233 return -EFAULT;
235 if (!(dev = try_then_request_module(atm_dev_lookup(number),
236 "atm-device-%d", number)))
237 return -ENODEV;
239 switch (cmd) {
240 case ATM_GETTYPE:
241 size = strlen(dev->type) + 1;
242 if (copy_to_user(buf, dev->type, size)) {
243 error = -EFAULT;
244 goto done;
246 break;
247 case ATM_GETESI:
248 size = ESI_LEN;
249 if (copy_to_user(buf, dev->esi, size)) {
250 error = -EFAULT;
251 goto done;
253 break;
254 case ATM_SETESI:
256 int i;
258 for (i = 0; i < ESI_LEN; i++)
259 if (dev->esi[i]) {
260 error = -EEXIST;
261 goto done;
264 /* fall through */
265 case ATM_SETESIF:
267 unsigned char esi[ESI_LEN];
269 if (!capable(CAP_NET_ADMIN)) {
270 error = -EPERM;
271 goto done;
273 if (copy_from_user(esi, buf, ESI_LEN)) {
274 error = -EFAULT;
275 goto done;
277 memcpy(dev->esi, esi, ESI_LEN);
278 error = ESI_LEN;
279 goto done;
281 case ATM_GETSTATZ:
282 if (!capable(CAP_NET_ADMIN)) {
283 error = -EPERM;
284 goto done;
286 /* fall through */
287 case ATM_GETSTAT:
288 size = sizeof(struct atm_dev_stats);
289 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
290 if (error)
291 goto done;
292 break;
293 case ATM_GETCIRANGE:
294 size = sizeof(struct atm_cirange);
295 if (copy_to_user(buf, &dev->ci_range, size)) {
296 error = -EFAULT;
297 goto done;
299 break;
300 case ATM_GETLINKRATE:
301 size = sizeof(int);
302 if (copy_to_user(buf, &dev->link_rate, size)) {
303 error = -EFAULT;
304 goto done;
306 break;
307 case ATM_RSTADDR:
308 if (!capable(CAP_NET_ADMIN)) {
309 error = -EPERM;
310 goto done;
312 atm_reset_addr(dev, ATM_ADDR_LOCAL);
313 break;
314 case ATM_ADDADDR:
315 case ATM_DELADDR:
316 case ATM_ADDLECSADDR:
317 case ATM_DELLECSADDR:
318 if (!capable(CAP_NET_ADMIN)) {
319 error = -EPERM;
320 goto done;
323 struct sockaddr_atmsvc addr;
325 if (copy_from_user(&addr, buf, sizeof(addr))) {
326 error = -EFAULT;
327 goto done;
329 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
330 error = atm_add_addr(dev, &addr,
331 (cmd == ATM_ADDADDR ?
332 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
333 else
334 error = atm_del_addr(dev, &addr,
335 (cmd == ATM_DELADDR ?
336 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
337 goto done;
339 case ATM_GETADDR:
340 case ATM_GETLECSADDR:
341 error = atm_get_addr(dev, buf, len,
342 (cmd == ATM_GETADDR ?
343 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
344 if (error < 0)
345 goto done;
346 size = error;
347 /* may return 0, but later on size == 0 means "don't
348 write the length" */
349 error = put_user(size, &sioc->length)
350 ? -EFAULT : 0;
351 goto done;
352 case ATM_SETLOOP:
353 if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
354 __ATM_LM_XTLOC((int) (unsigned long) buf) >
355 __ATM_LM_XTRMT((int) (unsigned long) buf)) {
356 error = -EINVAL;
357 goto done;
359 /* fall through */
360 case ATM_SETCIRANGE:
361 case SONET_GETSTATZ:
362 case SONET_SETDIAG:
363 case SONET_CLRDIAG:
364 case SONET_SETFRAMING:
365 if (!capable(CAP_NET_ADMIN)) {
366 error = -EPERM;
367 goto done;
369 /* fall through */
370 default:
371 if (!dev->ops->ioctl) {
372 error = -EINVAL;
373 goto done;
375 size = dev->ops->ioctl(dev, cmd, buf);
376 if (size < 0) {
377 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
378 goto done;
382 if (size)
383 error = put_user(size, &sioc->length)
384 ? -EFAULT : 0;
385 else
386 error = 0;
387 done:
388 atm_dev_put(dev);
389 return error;
392 static __inline__ void *dev_get_idx(loff_t left)
394 struct list_head *p;
396 list_for_each(p, &atm_devs) {
397 if (!--left)
398 break;
400 return (p != &atm_devs) ? p : NULL;
403 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
405 mutex_lock(&atm_dev_mutex);
406 return *pos ? dev_get_idx(*pos) : (void *) 1;
409 void atm_dev_seq_stop(struct seq_file *seq, void *v)
411 mutex_unlock(&atm_dev_mutex);
414 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
416 ++*pos;
417 v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
418 return (v == &atm_devs) ? NULL : v;
422 EXPORT_SYMBOL(atm_dev_register);
423 EXPORT_SYMBOL(atm_dev_deregister);
424 EXPORT_SYMBOL(atm_dev_lookup);