1 /* net/atm/resources.c - Statically allocated resources */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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 */
11 #include <linux/ctype.h>
12 #include <linux/string.h>
13 #include <linux/atmdev.h>
14 #include <linux/sonet.h>
15 #include <linux/kernel.h> /* for barrier */
16 #include <linux/module.h>
17 #include <linux/bitops.h>
18 #include <linux/capability.h>
19 #include <linux/delay.h>
20 #include <linux/mutex.h>
22 #include <net/sock.h> /* for struct sock */
25 #include "resources.h"
30 DEFINE_MUTEX(atm_dev_mutex);
32 static struct atm_dev *__alloc_atm_dev(const char *type)
36 dev = kmalloc(sizeof(*dev), GFP_KERNEL);
39 memset(dev, 0, sizeof(*dev));
41 dev->signal = ATM_PHY_SIG_UNKNOWN;
42 dev->link_rate = ATM_OC3_PCR;
43 spin_lock_init(&dev->lock);
44 INIT_LIST_HEAD(&dev->local);
45 INIT_LIST_HEAD(&dev->lecs);
50 static struct atm_dev *__atm_dev_lookup(int number)
55 list_for_each(p, &atm_devs) {
56 dev = list_entry(p, struct atm_dev, 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);
76 struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
77 int number, unsigned long *flags)
79 struct atm_dev *dev, *inuse;
81 dev = __alloc_atm_dev(type);
83 printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
87 mutex_lock(&atm_dev_mutex);
89 if ((inuse = __atm_dev_lookup(number))) {
91 mutex_unlock(&atm_dev_mutex);
98 while ((inuse = __atm_dev_lookup(dev->number))) {
108 memset(&dev->flags, 0, sizeof(dev->flags));
109 memset(&dev->stats, 0, sizeof(dev->stats));
110 atomic_set(&dev->refcnt, 1);
112 if (atm_proc_dev_register(dev) < 0) {
113 printk(KERN_ERR "atm_dev_register: "
114 "atm_proc_dev_register failed for dev %s\n",
119 if (atm_register_sysfs(dev) < 0) {
120 printk(KERN_ERR "atm_dev_register: "
121 "atm_register_sysfs failed for dev %s\n",
123 atm_proc_dev_deregister(dev);
127 list_add_tail(&dev->dev_list, &atm_devs);
130 mutex_unlock(&atm_dev_mutex);
140 void atm_dev_deregister(struct atm_dev *dev)
142 BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
143 set_bit(ATM_DF_REMOVED, &dev->flags);
146 * if we remove current device from atm_devs list, new device
147 * with same number can appear, such we need deregister proc,
148 * release async all vccs and remove them from vccs list too
150 mutex_lock(&atm_dev_mutex);
151 list_del(&dev->dev_list);
152 mutex_unlock(&atm_dev_mutex);
154 atm_dev_release_vccs(dev);
155 atm_unregister_sysfs(dev);
156 atm_proc_dev_deregister(dev);
162 static void copy_aal_stats(struct k_atm_aal_stats *from,
163 struct atm_aal_stats *to)
165 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
171 static void subtract_aal_stats(struct k_atm_aal_stats *from,
172 struct atm_aal_stats *to)
174 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
180 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
182 struct atm_dev_stats tmp;
185 copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
186 copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
187 copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
189 error = copy_to_user(arg, &tmp, sizeof(tmp));
190 if (zero && !error) {
191 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
192 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
193 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
195 return error ? -EFAULT : 0;
199 int atm_dev_ioctl(unsigned int cmd, void __user *arg)
202 int error, len, number, size = 0;
205 int *tmp_buf, *tmp_p;
206 struct atm_iobuf __user *iobuf = arg;
207 struct atmif_sioc __user *sioc = arg;
210 if (get_user(buf, &iobuf->buffer))
212 if (get_user(len, &iobuf->length))
214 mutex_lock(&atm_dev_mutex);
215 list_for_each(p, &atm_devs)
218 mutex_unlock(&atm_dev_mutex);
221 tmp_buf = kmalloc(size, GFP_ATOMIC);
223 mutex_unlock(&atm_dev_mutex);
227 list_for_each(p, &atm_devs) {
228 dev = list_entry(p, struct atm_dev, dev_list);
229 *tmp_p++ = dev->number;
231 mutex_unlock(&atm_dev_mutex);
232 error = ((copy_to_user(buf, tmp_buf, size)) ||
233 put_user(size, &iobuf->length))
241 if (get_user(buf, &sioc->arg))
243 if (get_user(len, &sioc->length))
245 if (get_user(number, &sioc->number))
248 if (!(dev = try_then_request_module(atm_dev_lookup(number),
249 "atm-device-%d", number)))
254 size = strlen(dev->type) + 1;
255 if (copy_to_user(buf, dev->type, size)) {
262 if (copy_to_user(buf, dev->esi, size)) {
271 for (i = 0; i < ESI_LEN; i++)
280 unsigned char esi[ESI_LEN];
282 if (!capable(CAP_NET_ADMIN)) {
286 if (copy_from_user(esi, buf, ESI_LEN)) {
290 memcpy(dev->esi, esi, ESI_LEN);
295 if (!capable(CAP_NET_ADMIN)) {
301 size = sizeof(struct atm_dev_stats);
302 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
307 size = sizeof(struct atm_cirange);
308 if (copy_to_user(buf, &dev->ci_range, size)) {
313 case ATM_GETLINKRATE:
315 if (copy_to_user(buf, &dev->link_rate, size)) {
321 if (!capable(CAP_NET_ADMIN)) {
325 atm_reset_addr(dev, ATM_ADDR_LOCAL);
329 case ATM_ADDLECSADDR:
330 case ATM_DELLECSADDR:
331 if (!capable(CAP_NET_ADMIN)) {
336 struct sockaddr_atmsvc addr;
338 if (copy_from_user(&addr, buf, sizeof(addr))) {
342 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
343 error = atm_add_addr(dev, &addr,
344 (cmd == ATM_ADDADDR ?
345 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
347 error = atm_del_addr(dev, &addr,
348 (cmd == ATM_DELADDR ?
349 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
353 case ATM_GETLECSADDR:
354 error = atm_get_addr(dev, buf, len,
355 (cmd == ATM_GETADDR ?
356 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
360 /* may return 0, but later on size == 0 means "don't
362 error = put_user(size, &sioc->length)
366 if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
367 __ATM_LM_XTLOC((int) (unsigned long) buf) >
368 __ATM_LM_XTRMT((int) (unsigned long) buf)) {
377 case SONET_SETFRAMING:
378 if (!capable(CAP_NET_ADMIN)) {
384 if (!dev->ops->ioctl) {
388 size = dev->ops->ioctl(dev, cmd, buf);
390 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
396 error = put_user(size, &sioc->length)
405 static __inline__ void *dev_get_idx(loff_t left)
409 list_for_each(p, &atm_devs) {
413 return (p != &atm_devs) ? p : NULL;
416 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
418 mutex_lock(&atm_dev_mutex);
419 return *pos ? dev_get_idx(*pos) : (void *) 1;
422 void atm_dev_seq_stop(struct seq_file *seq, void *v)
424 mutex_unlock(&atm_dev_mutex);
427 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
430 v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
431 return (v == &atm_devs) ? NULL : v;
435 EXPORT_SYMBOL(atm_dev_register);
436 EXPORT_SYMBOL(atm_dev_deregister);
437 EXPORT_SYMBOL(atm_dev_lookup);