1
2
3
4
5
6
7
8
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>
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>
25
26#include "common.h"
27#include "resources.h"
28#include "addr.h"
29
30
31LIST_HEAD(atm_devs);
32DEFINE_MUTEX(atm_dev_mutex);
33
34static 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
51static 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
66struct 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}
75EXPORT_SYMBOL(atm_dev_lookup);
76
77struct 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
127out:
128 mutex_unlock(&atm_dev_mutex);
129 return dev;
130
131out_fail:
132 kfree(dev);
133 dev = NULL;
134 goto out;
135}
136EXPORT_SYMBOL(atm_dev_register);
137
138void 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
145
146
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}
158EXPORT_SYMBOL(atm_dev_deregister);
159
160static 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
168static 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
176static 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
195int 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;
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
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
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
397
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
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
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;
444done:
445 atm_dev_put(dev);
446 return error;
447}
448
449void *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
455void atm_dev_seq_stop(struct seq_file *seq, void *v)
456{
457 mutex_unlock(&atm_dev_mutex);
458}
459
460void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
461{
462 return seq_list_next(v, &atm_devs, pos);
463}
464
