1 // SPDX-License-Identifier: GPL-2.0
2 /* net/atm/resources.c - Statically allocated resources */
4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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 */
11 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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>
25 #include <net/sock.h> /* for struct sock */
28 #include "resources.h"
33 DEFINE_MUTEX(atm_dev_mutex);
35 static struct atm_dev *__alloc_atm_dev(const char *type)
39 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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);
52 static struct atm_dev *__atm_dev_lookup(int number)
56 list_for_each_entry(dev, &atm_devs, dev_list) {
57 if (dev->number == number) {
65 struct atm_dev *atm_dev_lookup(int number)
69 mutex_lock(&atm_dev_mutex);
70 dev = __atm_dev_lookup(number);
71 mutex_unlock(&atm_dev_mutex);
74 EXPORT_SYMBOL(atm_dev_lookup);
76 struct atm_dev *atm_dev_register(const char *type, struct device *parent,
77 const struct atmdev_ops *ops, int number,
80 struct atm_dev *dev, *inuse;
82 dev = __alloc_atm_dev(type);
84 pr_err("no space for dev %s\n", type);
87 mutex_lock(&atm_dev_mutex);
89 inuse = __atm_dev_lookup(number);
92 mutex_unlock(&atm_dev_mutex);
99 while ((inuse = __atm_dev_lookup(dev->number))) {
109 memset(&dev->flags, 0, sizeof(dev->flags));
110 memset(&dev->stats, 0, sizeof(dev->stats));
111 refcount_set(&dev->refcnt, 1);
113 if (atm_proc_dev_register(dev) < 0) {
114 pr_err("atm_proc_dev_register failed for dev %s\n", type);
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);
124 list_add_tail(&dev->dev_list, &atm_devs);
127 mutex_unlock(&atm_dev_mutex);
135 EXPORT_SYMBOL(atm_dev_register);
137 void atm_dev_deregister(struct atm_dev *dev)
139 BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
140 set_bit(ATM_DF_REMOVED, &dev->flags);
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
147 mutex_lock(&atm_dev_mutex);
148 list_del(&dev->dev_list);
149 mutex_unlock(&atm_dev_mutex);
151 atm_dev_release_vccs(dev);
152 atm_unregister_sysfs(dev);
153 atm_proc_dev_deregister(dev);
157 EXPORT_SYMBOL(atm_dev_deregister);
159 static void copy_aal_stats(struct k_atm_aal_stats *from,
160 struct atm_aal_stats *to)
162 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
167 static void subtract_aal_stats(struct k_atm_aal_stats *from,
168 struct atm_aal_stats *to)
170 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
175 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
178 struct atm_dev_stats tmp;
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);
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);
191 return error ? -EFAULT : 0;
194 int atm_getnames(void __user *buf, int __user *iobuf_len)
196 int error, len, size = 0;
199 int *tmp_buf, *tmp_p;
201 if (get_user(len, iobuf_len))
203 mutex_lock(&atm_dev_mutex);
204 list_for_each(p, &atm_devs)
207 mutex_unlock(&atm_dev_mutex);
210 tmp_buf = kmalloc(size, GFP_ATOMIC);
212 mutex_unlock(&atm_dev_mutex);
216 list_for_each_entry(dev, &atm_devs, dev_list) {
217 *tmp_p++ = dev->number;
219 mutex_unlock(&atm_dev_mutex);
220 error = ((copy_to_user(buf, tmp_buf, size)) ||
221 put_user(size, iobuf_len))
227 int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
228 int number, int compat)
230 int error, len, size = 0;
233 if (get_user(len, sioc_len))
236 dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
243 size = strlen(dev->type) + 1;
244 if (copy_to_user(buf, dev->type, size)) {
251 if (copy_to_user(buf, dev->esi, size)) {
260 for (i = 0; i < ESI_LEN; i++)
269 unsigned char esi[ESI_LEN];
271 if (!capable(CAP_NET_ADMIN)) {
275 if (copy_from_user(esi, buf, ESI_LEN)) {
279 memcpy(dev->esi, esi, ESI_LEN);
284 if (!capable(CAP_NET_ADMIN)) {
290 size = sizeof(struct atm_dev_stats);
291 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
296 size = sizeof(struct atm_cirange);
297 if (copy_to_user(buf, &dev->ci_range, size)) {
302 case ATM_GETLINKRATE:
304 if (copy_to_user(buf, &dev->link_rate, size)) {
310 if (!capable(CAP_NET_ADMIN)) {
314 atm_reset_addr(dev, ATM_ADDR_LOCAL);
318 case ATM_ADDLECSADDR:
319 case ATM_DELLECSADDR:
321 struct sockaddr_atmsvc addr;
323 if (!capable(CAP_NET_ADMIN)) {
328 if (copy_from_user(&addr, buf, sizeof(addr))) {
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));
337 error = atm_del_addr(dev, &addr,
338 (cmd == ATM_DELADDR ?
339 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
343 case ATM_GETLECSADDR:
344 error = atm_get_addr(dev, buf, len,
345 (cmd == ATM_GETADDR ?
346 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
350 /* may return 0, but later on size == 0 means "don't
352 error = put_user(size, sioc_len) ? -EFAULT : 0;
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)) {
366 case SONET_SETFRAMING:
367 if (!capable(CAP_NET_ADMIN)) {
373 if (IS_ENABLED(CONFIG_COMPAT) && compat) {
375 if (!dev->ops->compat_ioctl) {
379 size = dev->ops->compat_ioctl(dev, cmd, buf);
382 if (!dev->ops->ioctl) {
386 size = dev->ops->ioctl(dev, cmd, buf);
389 error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
395 error = put_user(size, sioc_len) ? -EFAULT : 0;
403 #ifdef CONFIG_PROC_FS
404 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
406 mutex_lock(&atm_dev_mutex);
407 return seq_list_start_head(&atm_devs, *pos);
410 void atm_dev_seq_stop(struct seq_file *seq, void *v)
412 mutex_unlock(&atm_dev_mutex);
415 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
417 return seq_list_next(v, &atm_devs, pos);