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 */
10 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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>
23 #include <net/sock.h> /* for struct sock */
26 #include "resources.h"
31 DEFINE_MUTEX(atm_dev_mutex);
33 static struct atm_dev *__alloc_atm_dev(const char *type)
37 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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);
74 EXPORT_SYMBOL(atm_dev_lookup);
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 pr_err("no space for dev %s\n", type);
86 mutex_lock(&atm_dev_mutex);
88 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 pr_err("atm_proc_dev_register failed for dev %s\n", type);
117 if (atm_register_sysfs(dev) < 0) {
118 pr_err("atm_register_sysfs failed for dev %s\n", type);
119 atm_proc_dev_deregister(dev);
123 list_add_tail(&dev->dev_list, &atm_devs);
126 mutex_unlock(&atm_dev_mutex);
134 EXPORT_SYMBOL(atm_dev_register);
136 void atm_dev_deregister(struct atm_dev *dev)
138 BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
139 set_bit(ATM_DF_REMOVED, &dev->flags);
142 * if we remove current device from atm_devs list, new device
143 * with same number can appear, such we need deregister proc,
144 * release async all vccs and remove them from vccs list too
146 mutex_lock(&atm_dev_mutex);
147 list_del(&dev->dev_list);
148 mutex_unlock(&atm_dev_mutex);
150 atm_dev_release_vccs(dev);
151 atm_unregister_sysfs(dev);
152 atm_proc_dev_deregister(dev);
156 EXPORT_SYMBOL(atm_dev_deregister);
158 static void copy_aal_stats(struct k_atm_aal_stats *from,
159 struct atm_aal_stats *to)
161 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
166 static void subtract_aal_stats(struct k_atm_aal_stats *from,
167 struct atm_aal_stats *to)
169 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
174 static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
177 struct atm_dev_stats tmp;
180 copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
181 copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
182 copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
184 error = copy_to_user(arg, &tmp, sizeof(tmp));
185 if (zero && !error) {
186 subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
187 subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
188 subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
190 return error ? -EFAULT : 0;
193 int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
196 int error, len, number, size = 0;
199 int *tmp_buf, *tmp_p;
200 int __user *sioc_len;
201 int __user *iobuf_len;
203 #ifndef CONFIG_COMPAT
204 compat = 0; /* Just so the compiler _knows_ */
211 struct compat_atm_iobuf __user *ciobuf = arg;
213 iobuf_len = &ciobuf->length;
214 if (get_user(cbuf, &ciobuf->buffer))
216 buf = compat_ptr(cbuf);
219 struct atm_iobuf __user *iobuf = arg;
220 iobuf_len = &iobuf->length;
221 if (get_user(buf, &iobuf->buffer))
224 if (get_user(len, iobuf_len))
226 mutex_lock(&atm_dev_mutex);
227 list_for_each(p, &atm_devs)
230 mutex_unlock(&atm_dev_mutex);
233 tmp_buf = kmalloc(size, GFP_ATOMIC);
235 mutex_unlock(&atm_dev_mutex);
239 list_for_each(p, &atm_devs) {
240 dev = list_entry(p, struct atm_dev, dev_list);
241 *tmp_p++ = dev->number;
243 mutex_unlock(&atm_dev_mutex);
244 error = ((copy_to_user(buf, tmp_buf, size)) ||
245 put_user(size, iobuf_len))
255 struct compat_atmif_sioc __user *csioc = arg;
258 sioc_len = &csioc->length;
259 if (get_user(carg, &csioc->arg))
261 buf = compat_ptr(carg);
263 if (get_user(len, &csioc->length))
265 if (get_user(number, &csioc->number))
269 struct atmif_sioc __user *sioc = arg;
271 sioc_len = &sioc->length;
272 if (get_user(buf, &sioc->arg))
274 if (get_user(len, &sioc->length))
276 if (get_user(number, &sioc->number))
280 dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
287 size = strlen(dev->type) + 1;
288 if (copy_to_user(buf, dev->type, size)) {
295 if (copy_to_user(buf, dev->esi, size)) {
304 for (i = 0; i < ESI_LEN; i++)
313 unsigned char esi[ESI_LEN];
315 if (!capable(CAP_NET_ADMIN)) {
319 if (copy_from_user(esi, buf, ESI_LEN)) {
323 memcpy(dev->esi, esi, ESI_LEN);
328 if (!capable(CAP_NET_ADMIN)) {
334 size = sizeof(struct atm_dev_stats);
335 error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
340 size = sizeof(struct atm_cirange);
341 if (copy_to_user(buf, &dev->ci_range, size)) {
346 case ATM_GETLINKRATE:
348 if (copy_to_user(buf, &dev->link_rate, size)) {
354 if (!capable(CAP_NET_ADMIN)) {
358 atm_reset_addr(dev, ATM_ADDR_LOCAL);
362 case ATM_ADDLECSADDR:
363 case ATM_DELLECSADDR:
365 struct sockaddr_atmsvc addr;
367 if (!capable(CAP_NET_ADMIN)) {
372 if (copy_from_user(&addr, buf, sizeof(addr))) {
376 if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
377 error = atm_add_addr(dev, &addr,
378 (cmd == ATM_ADDADDR ?
379 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
381 error = atm_del_addr(dev, &addr,
382 (cmd == ATM_DELADDR ?
383 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
387 case ATM_GETLECSADDR:
388 error = atm_get_addr(dev, buf, len,
389 (cmd == ATM_GETADDR ?
390 ATM_ADDR_LOCAL : ATM_ADDR_LECS));
394 /* may return 0, but later on size == 0 means "don't
396 error = put_user(size, sioc_len) ? -EFAULT : 0;
399 if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
400 __ATM_LM_XTLOC((int) (unsigned long) buf) >
401 __ATM_LM_XTRMT((int) (unsigned long) buf)) {
410 case SONET_SETFRAMING:
411 if (!capable(CAP_NET_ADMIN)) {
419 if (!dev->ops->compat_ioctl) {
423 size = dev->ops->compat_ioctl(dev, cmd, buf);
426 if (!dev->ops->ioctl) {
430 size = dev->ops->ioctl(dev, cmd, buf);
433 error = (size == -ENOIOCTLCMD ? -EINVAL : size);
439 error = put_user(size, sioc_len) ? -EFAULT : 0;
447 static inline void *dev_get_idx(loff_t left)
451 list_for_each(p, &atm_devs) {
455 return (p != &atm_devs) ? p : NULL;
458 void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
460 mutex_lock(&atm_dev_mutex);
461 return *pos ? dev_get_idx(*pos) : SEQ_START_TOKEN;
464 void atm_dev_seq_stop(struct seq_file *seq, void *v)
466 mutex_unlock(&atm_dev_mutex);
469 void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
472 v = (v == SEQ_START_TOKEN)
473 ? atm_devs.next : ((struct list_head *)v)->next;
474 return (v == &atm_devs) ? NULL : v;