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v5.9
  1// SPDX-License-Identifier: GPL-2.0
  2/* net/atm/resources.c - Statically allocated resources */
  3
  4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  5
  6/* Fixes
  7 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  8 * 2002/01 - don't free the whole struct sock on sk->destruct time,
  9 * 	     use the default destruct function initialized by sock_init_data */
 10
 11#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
 12
 13#include <linux/ctype.h>
 14#include <linux/string.h>
 15#include <linux/atmdev.h>
 16#include <linux/sonet.h>
 17#include <linux/kernel.h> /* for barrier */
 18#include <linux/module.h>
 19#include <linux/bitops.h>
 20#include <linux/capability.h>
 21#include <linux/delay.h>
 22#include <linux/mutex.h>
 23#include <linux/slab.h>
 24
 25#include <net/sock.h>	 /* for struct sock */
 26
 27#include "common.h"
 28#include "resources.h"
 29#include "addr.h"
 30
 31
 32LIST_HEAD(atm_devs);
 33DEFINE_MUTEX(atm_dev_mutex);
 34
 35static struct atm_dev *__alloc_atm_dev(const char *type)
 36{
 37	struct atm_dev *dev;
 38
 39	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 40	if (!dev)
 41		return NULL;
 42	dev->type = type;
 43	dev->signal = ATM_PHY_SIG_UNKNOWN;
 44	dev->link_rate = ATM_OC3_PCR;
 45	spin_lock_init(&dev->lock);
 46	INIT_LIST_HEAD(&dev->local);
 47	INIT_LIST_HEAD(&dev->lecs);
 48
 49	return dev;
 50}
 51
 52static 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->number == number) {
 60			atm_dev_hold(dev);
 61			return dev;
 62		}
 63	}
 64	return NULL;
 65}
 66
 67struct atm_dev *atm_dev_lookup(int number)
 68{
 69	struct atm_dev *dev;
 70
 71	mutex_lock(&atm_dev_mutex);
 72	dev = __atm_dev_lookup(number);
 73	mutex_unlock(&atm_dev_mutex);
 74	return dev;
 75}
 76EXPORT_SYMBOL(atm_dev_lookup);
 77
 78struct atm_dev *atm_dev_register(const char *type, struct device *parent,
 79				 const struct atmdev_ops *ops, int number,
 80				 unsigned long *flags)
 81{
 82	struct atm_dev *dev, *inuse;
 83
 84	dev = __alloc_atm_dev(type);
 85	if (!dev) {
 86		pr_err("no space for dev %s\n", type);
 87		return NULL;
 88	}
 89	mutex_lock(&atm_dev_mutex);
 90	if (number != -1) {
 91		inuse = __atm_dev_lookup(number);
 92		if (inuse) {
 93			atm_dev_put(inuse);
 94			mutex_unlock(&atm_dev_mutex);
 95			kfree(dev);
 96			return NULL;
 97		}
 98		dev->number = number;
 99	} else {
100		dev->number = 0;
101		while ((inuse = __atm_dev_lookup(dev->number))) {
102			atm_dev_put(inuse);
103			dev->number++;
104		}
105	}
106
107	dev->ops = ops;
108	if (flags)
109		dev->flags = *flags;
110	else
111		memset(&dev->flags, 0, sizeof(dev->flags));
112	memset(&dev->stats, 0, sizeof(dev->stats));
113	refcount_set(&dev->refcnt, 1);
114
115	if (atm_proc_dev_register(dev) < 0) {
116		pr_err("atm_proc_dev_register failed for dev %s\n", type);
117		goto out_fail;
118	}
119
120	if (atm_register_sysfs(dev, parent) < 0) {
121		pr_err("atm_register_sysfs failed for dev %s\n", type);
122		atm_proc_dev_deregister(dev);
123		goto out_fail;
124	}
125
126	list_add_tail(&dev->dev_list, &atm_devs);
127
128out:
129	mutex_unlock(&atm_dev_mutex);
130	return dev;
131
132out_fail:
133	kfree(dev);
134	dev = NULL;
135	goto out;
136}
137EXPORT_SYMBOL(atm_dev_register);
138
139void atm_dev_deregister(struct atm_dev *dev)
140{
141	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
142	set_bit(ATM_DF_REMOVED, &dev->flags);
143
144	/*
145	 * if we remove current device from atm_devs list, new device
146	 * with same number can appear, such we need deregister proc,
147	 * release async all vccs and remove them from vccs list too
148	 */
149	mutex_lock(&atm_dev_mutex);
150	list_del(&dev->dev_list);
151	mutex_unlock(&atm_dev_mutex);
152
153	atm_dev_release_vccs(dev);
154	atm_unregister_sysfs(dev);
155	atm_proc_dev_deregister(dev);
156
157	atm_dev_put(dev);
158}
159EXPORT_SYMBOL(atm_dev_deregister);
160
161static void copy_aal_stats(struct k_atm_aal_stats *from,
162    struct atm_aal_stats *to)
163{
164#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
165	__AAL_STAT_ITEMS
166#undef __HANDLE_ITEM
167}
168
169static void subtract_aal_stats(struct k_atm_aal_stats *from,
170    struct atm_aal_stats *to)
171{
172#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
173	__AAL_STAT_ITEMS
174#undef __HANDLE_ITEM
175}
176
177static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
178		       int zero)
179{
180	struct atm_dev_stats tmp;
181	int error = 0;
182
183	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
184	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
185	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
186	if (arg)
187		error = copy_to_user(arg, &tmp, sizeof(tmp));
188	if (zero && !error) {
189		subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
190		subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
191		subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
192	}
193	return error ? -EFAULT : 0;
194}
195
196int atm_getnames(void __user *buf, int __user *iobuf_len)
197{
198	int error, len, size = 0;
199	struct atm_dev *dev;
200	struct list_head *p;
201	int *tmp_buf, *tmp_p;
202
203	if (get_user(len, iobuf_len))
204		return -EFAULT;
205	mutex_lock(&atm_dev_mutex);
206	list_for_each(p, &atm_devs)
207		size += sizeof(int);
208	if (size > len) {
209		mutex_unlock(&atm_dev_mutex);
210		return -E2BIG;
211	}
212	tmp_buf = kmalloc(size, GFP_ATOMIC);
213	if (!tmp_buf) {
214		mutex_unlock(&atm_dev_mutex);
215		return -ENOMEM;
216	}
217	tmp_p = tmp_buf;
218	list_for_each(p, &atm_devs) {
219		dev = list_entry(p, struct atm_dev, dev_list);
220		*tmp_p++ = dev->number;
221	}
222	mutex_unlock(&atm_dev_mutex);
223	error = ((copy_to_user(buf, tmp_buf, size)) ||
224		 put_user(size, iobuf_len))
225		? -EFAULT : 0;
226	kfree(tmp_buf);
227	return error;
228}
229
230int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
231		  int number, int compat)
232{
233	int error, len, size = 0;
234	struct atm_dev *dev;
235
236	if (get_user(len, sioc_len))
237		return -EFAULT;
238
239	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
240				      number);
241	if (!dev)
242		return -ENODEV;
243
244	switch (cmd) {
245	case ATM_GETTYPE:
246		size = strlen(dev->type) + 1;
247		if (copy_to_user(buf, dev->type, size)) {
248			error = -EFAULT;
249			goto done;
250		}
251		break;
252	case ATM_GETESI:
253		size = ESI_LEN;
254		if (copy_to_user(buf, dev->esi, size)) {
255			error = -EFAULT;
256			goto done;
257		}
258		break;
259	case ATM_SETESI:
260	{
261		int i;
262
263		for (i = 0; i < ESI_LEN; i++)
264			if (dev->esi[i]) {
265				error = -EEXIST;
266				goto done;
267			}
268	}
269		fallthrough;
270	case ATM_SETESIF:
271	{
272		unsigned char esi[ESI_LEN];
273
274		if (!capable(CAP_NET_ADMIN)) {
275			error = -EPERM;
276			goto done;
277		}
278		if (copy_from_user(esi, buf, ESI_LEN)) {
279			error = -EFAULT;
280			goto done;
281		}
282		memcpy(dev->esi, esi, ESI_LEN);
283		error =  ESI_LEN;
284		goto done;
285	}
286	case ATM_GETSTATZ:
287		if (!capable(CAP_NET_ADMIN)) {
288			error = -EPERM;
289			goto done;
290		}
291		fallthrough;
292	case ATM_GETSTAT:
293		size = sizeof(struct atm_dev_stats);
294		error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
295		if (error)
296			goto done;
297		break;
298	case ATM_GETCIRANGE:
299		size = sizeof(struct atm_cirange);
300		if (copy_to_user(buf, &dev->ci_range, size)) {
301			error = -EFAULT;
302			goto done;
303		}
304		break;
305	case ATM_GETLINKRATE:
306		size = sizeof(int);
307		if (copy_to_user(buf, &dev->link_rate, size)) {
308			error = -EFAULT;
309			goto done;
310		}
311		break;
312	case ATM_RSTADDR:
313		if (!capable(CAP_NET_ADMIN)) {
314			error = -EPERM;
315			goto done;
316		}
317		atm_reset_addr(dev, ATM_ADDR_LOCAL);
318		break;
319	case ATM_ADDADDR:
320	case ATM_DELADDR:
321	case ATM_ADDLECSADDR:
322	case ATM_DELLECSADDR:
323	{
324		struct sockaddr_atmsvc addr;
325
326		if (!capable(CAP_NET_ADMIN)) {
327			error = -EPERM;
328			goto done;
329		}
330
331		if (copy_from_user(&addr, buf, sizeof(addr))) {
332			error = -EFAULT;
333			goto done;
334		}
335		if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
336			error = atm_add_addr(dev, &addr,
337					     (cmd == ATM_ADDADDR ?
338					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
339		else
340			error = atm_del_addr(dev, &addr,
341					     (cmd == ATM_DELADDR ?
342					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
343		goto done;
344	}
345	case ATM_GETADDR:
346	case ATM_GETLECSADDR:
347		error = atm_get_addr(dev, buf, len,
348				     (cmd == ATM_GETADDR ?
349				      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
350		if (error < 0)
351			goto done;
352		size = error;
353		/* may return 0, but later on size == 0 means "don't
354		   write the length" */
355		error = put_user(size, sioc_len) ? -EFAULT : 0;
356		goto done;
357	case ATM_SETLOOP:
358		if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
359		    __ATM_LM_XTLOC((int) (unsigned long) buf) >
360		    __ATM_LM_XTRMT((int) (unsigned long) buf)) {
361			error = -EINVAL;
362			goto done;
363		}
364		fallthrough;
365	case ATM_SETCIRANGE:
366	case SONET_GETSTATZ:
367	case SONET_SETDIAG:
368	case SONET_CLRDIAG:
369	case SONET_SETFRAMING:
370		if (!capable(CAP_NET_ADMIN)) {
371			error = -EPERM;
372			goto done;
373		}
374		fallthrough;
375	default:
376		if (IS_ENABLED(CONFIG_COMPAT) && compat) {
377#ifdef CONFIG_COMPAT
378			if (!dev->ops->compat_ioctl) {
379				error = -EINVAL;
380				goto done;
381			}
382			size = dev->ops->compat_ioctl(dev, cmd, buf);
383#endif
384		} else {
385			if (!dev->ops->ioctl) {
386				error = -EINVAL;
387				goto done;
388			}
389			size = dev->ops->ioctl(dev, cmd, buf);
390		}
391		if (size < 0) {
392			error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
393			goto done;
394		}
395	}
396
397	if (size)
398		error = put_user(size, sioc_len) ? -EFAULT : 0;
399	else
400		error = 0;
401done:
402	atm_dev_put(dev);
403	return error;
404}
405
 
406void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
407{
408	mutex_lock(&atm_dev_mutex);
409	return seq_list_start_head(&atm_devs, *pos);
410}
411
412void atm_dev_seq_stop(struct seq_file *seq, void *v)
413{
414	mutex_unlock(&atm_dev_mutex);
415}
416
417void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
418{
419	return seq_list_next(v, &atm_devs, pos);
420}
v6.13.7
  1// SPDX-License-Identifier: GPL-2.0
  2/* net/atm/resources.c - Statically allocated resources */
  3
  4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  5
  6/* Fixes
  7 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  8 * 2002/01 - don't free the whole struct sock on sk->destruct time,
  9 * 	     use the default destruct function initialized by sock_init_data */
 10
 11#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
 12
 13#include <linux/ctype.h>
 14#include <linux/string.h>
 15#include <linux/atmdev.h>
 16#include <linux/sonet.h>
 17#include <linux/kernel.h> /* for barrier */
 18#include <linux/module.h>
 19#include <linux/bitops.h>
 20#include <linux/capability.h>
 21#include <linux/delay.h>
 22#include <linux/mutex.h>
 23#include <linux/slab.h>
 24
 25#include <net/sock.h>	 /* for struct sock */
 26
 27#include "common.h"
 28#include "resources.h"
 29#include "addr.h"
 30
 31
 32LIST_HEAD(atm_devs);
 33DEFINE_MUTEX(atm_dev_mutex);
 34
 35static struct atm_dev *__alloc_atm_dev(const char *type)
 36{
 37	struct atm_dev *dev;
 38
 39	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 40	if (!dev)
 41		return NULL;
 42	dev->type = type;
 43	dev->signal = ATM_PHY_SIG_UNKNOWN;
 44	dev->link_rate = ATM_OC3_PCR;
 45	spin_lock_init(&dev->lock);
 46	INIT_LIST_HEAD(&dev->local);
 47	INIT_LIST_HEAD(&dev->lecs);
 48
 49	return dev;
 50}
 51
 52static struct atm_dev *__atm_dev_lookup(int number)
 53{
 54	struct atm_dev *dev;
 
 55
 56	list_for_each_entry(dev, &atm_devs, dev_list) {
 
 57		if (dev->number == number) {
 58			atm_dev_hold(dev);
 59			return dev;
 60		}
 61	}
 62	return NULL;
 63}
 64
 65struct atm_dev *atm_dev_lookup(int number)
 66{
 67	struct atm_dev *dev;
 68
 69	mutex_lock(&atm_dev_mutex);
 70	dev = __atm_dev_lookup(number);
 71	mutex_unlock(&atm_dev_mutex);
 72	return dev;
 73}
 74EXPORT_SYMBOL(atm_dev_lookup);
 75
 76struct atm_dev *atm_dev_register(const char *type, struct device *parent,
 77				 const struct atmdev_ops *ops, int number,
 78				 unsigned long *flags)
 79{
 80	struct atm_dev *dev, *inuse;
 81
 82	dev = __alloc_atm_dev(type);
 83	if (!dev) {
 84		pr_err("no space for dev %s\n", type);
 85		return NULL;
 86	}
 87	mutex_lock(&atm_dev_mutex);
 88	if (number != -1) {
 89		inuse = __atm_dev_lookup(number);
 90		if (inuse) {
 91			atm_dev_put(inuse);
 92			mutex_unlock(&atm_dev_mutex);
 93			kfree(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	refcount_set(&dev->refcnt, 1);
112
113	if (atm_proc_dev_register(dev) < 0) {
114		pr_err("atm_proc_dev_register failed for dev %s\n", type);
115		goto out_fail;
116	}
117
118	if (atm_register_sysfs(dev, parent) < 0) {
119		pr_err("atm_register_sysfs failed for dev %s\n", type);
120		atm_proc_dev_deregister(dev);
121		goto out_fail;
122	}
123
124	list_add_tail(&dev->dev_list, &atm_devs);
125
126out:
127	mutex_unlock(&atm_dev_mutex);
128	return dev;
129
130out_fail:
131	kfree(dev);
132	dev = NULL;
133	goto out;
134}
135EXPORT_SYMBOL(atm_dev_register);
136
137void atm_dev_deregister(struct atm_dev *dev)
138{
139	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
140	set_bit(ATM_DF_REMOVED, &dev->flags);
141
142	/*
143	 * if we remove current device from atm_devs list, new device
144	 * with same number can appear, such we need deregister proc,
145	 * release async all vccs and remove them from vccs list too
146	 */
147	mutex_lock(&atm_dev_mutex);
148	list_del(&dev->dev_list);
149	mutex_unlock(&atm_dev_mutex);
150
151	atm_dev_release_vccs(dev);
152	atm_unregister_sysfs(dev);
153	atm_proc_dev_deregister(dev);
154
155	atm_dev_put(dev);
156}
157EXPORT_SYMBOL(atm_dev_deregister);
158
159static void copy_aal_stats(struct k_atm_aal_stats *from,
160    struct atm_aal_stats *to)
161{
162#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
163	__AAL_STAT_ITEMS
164#undef __HANDLE_ITEM
165}
166
167static void subtract_aal_stats(struct k_atm_aal_stats *from,
168    struct atm_aal_stats *to)
169{
170#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
171	__AAL_STAT_ITEMS
172#undef __HANDLE_ITEM
173}
174
175static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
176		       int zero)
177{
178	struct atm_dev_stats tmp;
179	int error = 0;
180
181	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
182	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
183	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
184	if (arg)
185		error = copy_to_user(arg, &tmp, sizeof(tmp));
186	if (zero && !error) {
187		subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
188		subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
189		subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
190	}
191	return error ? -EFAULT : 0;
192}
193
194int atm_getnames(void __user *buf, int __user *iobuf_len)
195{
196	int error, len, size = 0;
197	struct atm_dev *dev;
198	struct list_head *p;
199	int *tmp_buf, *tmp_p;
200
201	if (get_user(len, iobuf_len))
202		return -EFAULT;
203	mutex_lock(&atm_dev_mutex);
204	list_for_each(p, &atm_devs)
205		size += sizeof(int);
206	if (size > len) {
207		mutex_unlock(&atm_dev_mutex);
208		return -E2BIG;
209	}
210	tmp_buf = kmalloc(size, GFP_ATOMIC);
211	if (!tmp_buf) {
212		mutex_unlock(&atm_dev_mutex);
213		return -ENOMEM;
214	}
215	tmp_p = tmp_buf;
216	list_for_each_entry(dev, &atm_devs, dev_list) {
 
217		*tmp_p++ = dev->number;
218	}
219	mutex_unlock(&atm_dev_mutex);
220	error = ((copy_to_user(buf, tmp_buf, size)) ||
221		 put_user(size, iobuf_len))
222		? -EFAULT : 0;
223	kfree(tmp_buf);
224	return error;
225}
226
227int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
228		  int number, int compat)
229{
230	int error, len, size = 0;
231	struct atm_dev *dev;
232
233	if (get_user(len, sioc_len))
234		return -EFAULT;
235
236	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
237				      number);
238	if (!dev)
239		return -ENODEV;
240
241	switch (cmd) {
242	case ATM_GETTYPE:
243		size = strlen(dev->type) + 1;
244		if (copy_to_user(buf, dev->type, size)) {
245			error = -EFAULT;
246			goto done;
247		}
248		break;
249	case ATM_GETESI:
250		size = ESI_LEN;
251		if (copy_to_user(buf, dev->esi, size)) {
252			error = -EFAULT;
253			goto done;
254		}
255		break;
256	case ATM_SETESI:
257	{
258		int i;
259
260		for (i = 0; i < ESI_LEN; i++)
261			if (dev->esi[i]) {
262				error = -EEXIST;
263				goto done;
264			}
265	}
266		fallthrough;
267	case ATM_SETESIF:
268	{
269		unsigned char esi[ESI_LEN];
270
271		if (!capable(CAP_NET_ADMIN)) {
272			error = -EPERM;
273			goto done;
274		}
275		if (copy_from_user(esi, buf, ESI_LEN)) {
276			error = -EFAULT;
277			goto done;
278		}
279		memcpy(dev->esi, esi, ESI_LEN);
280		error =  ESI_LEN;
281		goto done;
282	}
283	case ATM_GETSTATZ:
284		if (!capable(CAP_NET_ADMIN)) {
285			error = -EPERM;
286			goto done;
287		}
288		fallthrough;
289	case ATM_GETSTAT:
290		size = sizeof(struct atm_dev_stats);
291		error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
292		if (error)
293			goto done;
294		break;
295	case ATM_GETCIRANGE:
296		size = sizeof(struct atm_cirange);
297		if (copy_to_user(buf, &dev->ci_range, size)) {
298			error = -EFAULT;
299			goto done;
300		}
301		break;
302	case ATM_GETLINKRATE:
303		size = sizeof(int);
304		if (copy_to_user(buf, &dev->link_rate, size)) {
305			error = -EFAULT;
306			goto done;
307		}
308		break;
309	case ATM_RSTADDR:
310		if (!capable(CAP_NET_ADMIN)) {
311			error = -EPERM;
312			goto done;
313		}
314		atm_reset_addr(dev, ATM_ADDR_LOCAL);
315		break;
316	case ATM_ADDADDR:
317	case ATM_DELADDR:
318	case ATM_ADDLECSADDR:
319	case ATM_DELLECSADDR:
320	{
321		struct sockaddr_atmsvc addr;
322
323		if (!capable(CAP_NET_ADMIN)) {
324			error = -EPERM;
325			goto done;
326		}
327
328		if (copy_from_user(&addr, buf, sizeof(addr))) {
329			error = -EFAULT;
330			goto done;
331		}
332		if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
333			error = atm_add_addr(dev, &addr,
334					     (cmd == ATM_ADDADDR ?
335					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
336		else
337			error = atm_del_addr(dev, &addr,
338					     (cmd == ATM_DELADDR ?
339					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
340		goto done;
341	}
342	case ATM_GETADDR:
343	case ATM_GETLECSADDR:
344		error = atm_get_addr(dev, buf, len,
345				     (cmd == ATM_GETADDR ?
346				      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
347		if (error < 0)
348			goto done;
349		size = error;
350		/* may return 0, but later on size == 0 means "don't
351		   write the length" */
352		error = put_user(size, sioc_len) ? -EFAULT : 0;
353		goto done;
354	case ATM_SETLOOP:
355		if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
356		    __ATM_LM_XTLOC((int) (unsigned long) buf) >
357		    __ATM_LM_XTRMT((int) (unsigned long) buf)) {
358			error = -EINVAL;
359			goto done;
360		}
361		fallthrough;
362	case ATM_SETCIRANGE:
363	case SONET_GETSTATZ:
364	case SONET_SETDIAG:
365	case SONET_CLRDIAG:
366	case SONET_SETFRAMING:
367		if (!capable(CAP_NET_ADMIN)) {
368			error = -EPERM;
369			goto done;
370		}
371		fallthrough;
372	default:
373		if (IS_ENABLED(CONFIG_COMPAT) && compat) {
374#ifdef CONFIG_COMPAT
375			if (!dev->ops->compat_ioctl) {
376				error = -EINVAL;
377				goto done;
378			}
379			size = dev->ops->compat_ioctl(dev, cmd, buf);
380#endif
381		} else {
382			if (!dev->ops->ioctl) {
383				error = -EINVAL;
384				goto done;
385			}
386			size = dev->ops->ioctl(dev, cmd, buf);
387		}
388		if (size < 0) {
389			error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
390			goto done;
391		}
392	}
393
394	if (size)
395		error = put_user(size, sioc_len) ? -EFAULT : 0;
396	else
397		error = 0;
398done:
399	atm_dev_put(dev);
400	return error;
401}
402
403#ifdef CONFIG_PROC_FS
404void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
405{
406	mutex_lock(&atm_dev_mutex);
407	return seq_list_start_head(&atm_devs, *pos);
408}
409
410void atm_dev_seq_stop(struct seq_file *seq, void *v)
411{
412	mutex_unlock(&atm_dev_mutex);
413}
414
415void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
416{
417	return seq_list_next(v, &atm_devs, pos);
418}
419#endif