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Linux/net/atm/resources.c

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  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 #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> /* 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>
 22 #include <linux/slab.h>
 23 
 24 #include <net/sock.h>    /* for struct sock */
 25 
 26 #include "common.h"
 27 #include "resources.h"
 28 #include "addr.h"
 29 
 30 
 31 LIST_HEAD(atm_devs);
 32 DEFINE_MUTEX(atm_dev_mutex);
 33 
 34 static 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 
 51 static 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 
 66 struct 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 }
 75 EXPORT_SYMBOL(atm_dev_lookup);
 76 
 77 struct 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 
127 out:
128         mutex_unlock(&atm_dev_mutex);
129         return dev;
130 
131 out_fail:
132         kfree(dev);
133         dev = NULL;
134         goto out;
135 }
136 EXPORT_SYMBOL(atm_dev_register);
137 
138 void 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          * if we remove current device from atm_devs list, new device
145          * with same number can appear, such we need deregister proc,
146          * release async all vccs and remove them from vccs list too
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 }
158 EXPORT_SYMBOL(atm_dev_deregister);
159 
160 static 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 
168 static 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 
176 static 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 
195 int 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; /* Just so the compiler _knows_ */
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         /* fall through */
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                 /* fall through */
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                 /* may return 0, but later on size == 0 means "don't
397                    write the length" */
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                 /* fall through */
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                 /* fall through */
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 ? -EINVAL : size);
436                         goto done;
437                 }
438         }
439 
440         if (size)
441                 error = put_user(size, sioc_len) ? -EFAULT : 0;
442         else
443                 error = 0;
444 done:
445         atm_dev_put(dev);
446         return error;
447 }
448 
449 void *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 
455 void atm_dev_seq_stop(struct seq_file *seq, void *v)
456 {
457         mutex_unlock(&atm_dev_mutex);
458 }
459 
460 void *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 

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