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);
28 DEFINE_SPINLOCK(atm_dev_lock);
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);
43
44 return dev;
45 }
46
47 static void __free_atm_dev(struct atm_dev *dev)
48 {
49 kfree(dev);
50 }
51
52 static struct atm_dev *__atm_dev_lookup(int number)
53 {
54 struct atm_dev *dev;
55 struct list_head *p;
56
57 list_for_each(p, &atm_devs) {
58 dev = list_entry(p, struct atm_dev, dev_list);
59 if ((dev->ops) && (dev->number == number)) {
60 atm_dev_hold(dev);
61 return dev;
62 }
63 }
64 return NULL;
65 }
66
67 struct atm_dev *atm_dev_lookup(int number)
68 {
69 struct atm_dev *dev;
70
71 spin_lock(&atm_dev_lock);
72 dev = __atm_dev_lookup(number);
73 spin_unlock(&atm_dev_lock);
74 return dev;
75 }
76
77 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
78 int number, unsigned long *flags)
79 {
80 struct atm_dev *dev, *inuse;
81
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;
87 }
88 spin_lock(&atm_dev_lock);
89 if (number != -1) {
90 if ((inuse = __atm_dev_lookup(number))) {
91 atm_dev_put(inuse);
92 spin_unlock(&atm_dev_lock);
93 __free_atm_dev(dev);
94 return NULL;
95 }
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++;
102 }
103 }
104
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);
112 list_add_tail(&dev->dev_list, &atm_devs);
113 spin_unlock(&atm_dev_lock);
114
115 if (atm_proc_dev_register(dev) < 0) {
116 printk(KERN_ERR "atm_dev_register: "
117 "atm_proc_dev_register failed for dev %s\n",
118 type);
119 spin_lock(&atm_dev_lock);
120 list_del(&dev->dev_list);
121 spin_unlock(&atm_dev_lock);
122 __free_atm_dev(dev);
123 return NULL;
124 }
125
126 return dev;
127 }
128
129
130 void atm_dev_deregister(struct atm_dev *dev)
131 {
132 unsigned long warning_time;
133
134 atm_proc_dev_deregister(dev);
135
136 spin_lock(&atm_dev_lock);
137 list_del(&dev->dev_list);
138 spin_unlock(&atm_dev_lock);
139
140 warning_time = jiffies;
141 while (atomic_read(&dev->refcnt) != 1) {
142 msleep(250);
143 if ((jiffies - warning_time) > 10 * HZ) {
144 printk(KERN_EMERG "atm_dev_deregister: waiting for "
145 "dev %d to become free. Usage count = %d\n",
146 dev->number, atomic_read(&dev->refcnt));
147 warning_time = jiffies;
148 }
149 }
150
151 __free_atm_dev(dev);
152 }
153
154 void shutdown_atm_dev(struct atm_dev *dev)
155 {
156 if (atomic_read(&dev->refcnt) > 1) {
157 set_bit(ATM_DF_CLOSE, &dev->flags);
158 return;
159 }
160 if (dev->ops->dev_close)
161 dev->ops->dev_close(dev);
162 atm_dev_deregister(dev);
163 }
164
165
166 static void copy_aal_stats(struct k_atm_aal_stats *from,
167 struct atm_aal_stats *to)
168 {
169 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
170 __AAL_STAT_ITEMS
171 #undef __HANDLE_ITEM
172 }
173
174
175 static void subtract_aal_stats(struct k_atm_aal_stats *from,
176 struct atm_aal_stats *to)
177 {
178 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
179 __AAL_STAT_ITEMS
180 #undef __HANDLE_ITEM
181 }
182
183
184 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
185 {
186 struct atm_dev_stats tmp;
187 int error = 0;
188
189 copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
190 copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
191 copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
192 if (arg)
193 error = copy_to_user(arg, &tmp, sizeof(tmp));
194 if (zero && !error) {
195 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
196 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
197 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
198 }
199 return error ? -EFAULT : 0;
200 }
201
202
203 int atm_dev_ioctl(unsigned int cmd, void __user *arg)
204 {
205 void __user *buf;
206 int error, len, number, size = 0;
207 struct atm_dev *dev;
208 struct list_head *p;
209 int *tmp_buf, *tmp_p;
210 struct atm_iobuf __user *iobuf = arg;
211 struct atmif_sioc __user *sioc = arg;
212 switch (cmd) {
213 case ATM_GETNAMES:
214 if (get_user(buf, &iobuf->buffer))
215 return -EFAULT;
216 if (get_user(len, &iobuf->length))
217 return -EFAULT;
218 spin_lock(&atm_dev_lock);
219 list_for_each(p, &atm_devs)
220 size += sizeof(int);
221 if (size > len) {
222 spin_unlock(&atm_dev_lock);
223 return -E2BIG;
224 }
225 tmp_buf = kmalloc(size, GFP_ATOMIC);
226 if (!tmp_buf) {
227 spin_unlock(&atm_dev_lock);
228 return -ENOMEM;
229 }
230 tmp_p = tmp_buf;
231 list_for_each(p, &atm_devs) {
232 dev = list_entry(p, struct atm_dev, dev_list);
233 *tmp_p++ = dev->number;
234 }
235 spin_unlock(&atm_dev_lock);
236 error = ((copy_to_user(buf, tmp_buf, size)) ||
237 put_user(size, &iobuf->length))
238 ? -EFAULT : 0;
239 kfree(tmp_buf);
240 return error;
241 default:
242 break;
243 }
244
245 if (get_user(buf, &sioc->arg))
246 return -EFAULT;
247 if (get_user(len, &sioc->length))
248 return -EFAULT;
249 if (get_user(number, &sioc->number))
250 return -EFAULT;
251
252 if (!(dev = atm_dev_lookup(number)))
253 return -ENODEV;
254
255 switch (cmd) {
256 case ATM_GETTYPE:
257 size = strlen(dev->type) + 1;
258 if (copy_to_user(buf, dev->type, size)) {
259 error = -EFAULT;
260 goto done;
261 }
262 break;
263 case ATM_GETESI:
264 size = ESI_LEN;
265 if (copy_to_user(buf, dev->esi, size)) {
266 error = -EFAULT;
267 goto done;
268 }
269 break;
270 case ATM_SETESI:
271 {
272 int i;
273
274 for (i = 0; i < ESI_LEN; i++)
275 if (dev->esi[i]) {
276 error = -EEXIST;
277 goto done;
278 }
279 }
280 /* fall through */
281 case ATM_SETESIF:
282 {
283 unsigned char esi[ESI_LEN];
284
285 if (!capable(CAP_NET_ADMIN)) {
286 error = -EPERM;
287 goto done;
288 }
289 if (copy_from_user(esi, buf, ESI_LEN)) {
290 error = -EFAULT;
291 goto done;
292 }
293 memcpy(dev->esi, esi, ESI_LEN);
294 error = ESI_LEN;
295 goto done;
296 }
297 case ATM_GETSTATZ:
298 if (!capable(CAP_NET_ADMIN)) {
299 error = -EPERM;
300 goto done;
301 }
302 /* fall through */
303 case ATM_GETSTAT:
304 size = sizeof(struct atm_dev_stats);
305 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
306 if (error)
307 goto done;
308 break;
309 case ATM_GETCIRANGE:
310 size = sizeof(struct atm_cirange);
311 if (copy_to_user(buf, &dev->ci_range, size)) {
312 error = -EFAULT;
313 goto done;
314 }
315 break;
316 case ATM_GETLINKRATE:
317 size = sizeof(int);
318 if (copy_to_user(buf, &dev->link_rate, size)) {
319 error = -EFAULT;
320 goto done;
321 }
322 break;
323 case ATM_RSTADDR:
324 if (!capable(CAP_NET_ADMIN)) {
325 error = -EPERM;
326 goto done;
327 }
328 atm_reset_addr(dev);
329 break;
330 case ATM_ADDADDR:
331 case ATM_DELADDR:
332 if (!capable(CAP_NET_ADMIN)) {
333 error = -EPERM;
334 goto done;
335 }
336 {
337 struct sockaddr_atmsvc addr;
338
339 if (copy_from_user(&addr, buf, sizeof(addr))) {
340 error = -EFAULT;
341 goto done;
342 }
343 if (cmd == ATM_ADDADDR)
344 error = atm_add_addr(dev, &addr);
345 else
346 error = atm_del_addr(dev, &addr);
347 goto done;
348 }
349 case ATM_GETADDR:
350 error = atm_get_addr(dev, buf, len);
351 if (error < 0)
352 goto done;
353 size = error;
354 /* may return 0, but later on size == 0 means "don't
355 write the length" */
356 error = put_user(size, &sioc->length)
357 ? -EFAULT : 0;
358 goto done;
359 case ATM_SETLOOP:
360 if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
361 __ATM_LM_XTLOC((int) (unsigned long) buf) >
362 __ATM_LM_XTRMT((int) (unsigned long) buf)) {
363 error = -EINVAL;
364 goto done;
365 }
366 /* fall through */
367 case ATM_SETCIRANGE:
368 case SONET_GETSTATZ:
369 case SONET_SETDIAG:
370 case SONET_CLRDIAG:
371 case SONET_SETFRAMING:
372 if (!capable(CAP_NET_ADMIN)) {
373 error = -EPERM;
374 goto done;
375 }
376 /* fall through */
377 default:
378 if (!dev->ops->ioctl) {
379 error = -EINVAL;
380 goto done;
381 }
382 size = dev->ops->ioctl(dev, cmd, buf);
383 if (size < 0) {
384 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
385 goto done;
386 }
387 }
388
389 if (size)
390 error = put_user(size, &sioc->length)
391 ? -EFAULT : 0;
392 else
393 error = 0;
394 done:
395 atm_dev_put(dev);
396 return error;
397 }
398
399 static __inline__ void *dev_get_idx(loff_t left)
400 {
401 struct list_head *p;
402
403 list_for_each(p, &atm_devs) {
404 if (!--left)
405 break;
406 }
407 return (p != &atm_devs) ? p : NULL;
408 }
409
410 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
411 {
412 spin_lock(&atm_dev_lock);
413 return *pos ? dev_get_idx(*pos) : (void *) 1;
414 }
415
416 void atm_dev_seq_stop(struct seq_file *seq, void *v)
417 {
418 spin_unlock(&atm_dev_lock);
419 }
420
421 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
422 {
423 ++*pos;
424 v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
425 return (v == &atm_devs) ? NULL : v;
426 }
427
428
429 EXPORT_SYMBOL(atm_dev_register);
430 EXPORT_SYMBOL(atm_dev_deregister);
431 EXPORT_SYMBOL(atm_dev_lookup);
432 EXPORT_SYMBOL(shutdown_atm_dev);
433
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