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/config.h>
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/delay.h>
20 #include <net/sock.h> /* for struct sock */
23 #include "resources.h"
28 DECLARE_MUTEX(atm_dev_mutex
);
30 static struct atm_dev
*__alloc_atm_dev(const char *type
)
34 dev
= kmalloc(sizeof(*dev
), GFP_KERNEL
);
37 memset(dev
, 0, sizeof(*dev
));
39 dev
->signal
= ATM_PHY_SIG_UNKNOWN
;
40 dev
->link_rate
= ATM_OC3_PCR
;
41 spin_lock_init(&dev
->lock
);
42 INIT_LIST_HEAD(&dev
->local
);
43 INIT_LIST_HEAD(&dev
->lecs
);
48 static struct atm_dev
*__atm_dev_lookup(int number
)
53 list_for_each(p
, &atm_devs
) {
54 dev
= list_entry(p
, struct atm_dev
, dev_list
);
55 if (dev
->number
== number
) {
63 struct atm_dev
*atm_dev_lookup(int number
)
68 dev
= __atm_dev_lookup(number
);
74 struct atm_dev
*atm_dev_register(const char *type
, const struct atmdev_ops
*ops
,
75 int number
, unsigned long *flags
)
77 struct atm_dev
*dev
, *inuse
;
79 dev
= __alloc_atm_dev(type
);
81 printk(KERN_ERR
"atm_dev_register: no space for dev %s\n",
87 if ((inuse
= __atm_dev_lookup(number
))) {
96 while ((inuse
= __atm_dev_lookup(dev
->number
))) {
106 memset(&dev
->flags
, 0, sizeof(dev
->flags
));
107 memset(&dev
->stats
, 0, sizeof(dev
->stats
));
108 atomic_set(&dev
->refcnt
, 1);
110 if (atm_proc_dev_register(dev
) < 0) {
111 printk(KERN_ERR
"atm_dev_register: "
112 "atm_proc_dev_register failed for dev %s\n",
118 list_add_tail(&dev
->dev_list
, &atm_devs
);
125 void atm_dev_deregister(struct atm_dev
*dev
)
127 BUG_ON(test_bit(ATM_DF_REMOVED
, &dev
->flags
));
128 set_bit(ATM_DF_REMOVED
, &dev
->flags
);
131 * if we remove current device from atm_devs list, new device
132 * with same number can appear, such we need deregister proc,
133 * release async all vccs and remove them from vccs list too
135 down(&atm_dev_mutex
);
136 list_del(&dev
->dev_list
);
139 atm_dev_release_vccs(dev
);
140 atm_proc_dev_deregister(dev
);
146 static void copy_aal_stats(struct k_atm_aal_stats
*from
,
147 struct atm_aal_stats
*to
)
149 #define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
155 static void subtract_aal_stats(struct k_atm_aal_stats
*from
,
156 struct atm_aal_stats
*to
)
158 #define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
164 static int fetch_stats(struct atm_dev
*dev
, struct atm_dev_stats __user
*arg
, int zero
)
166 struct atm_dev_stats tmp
;
169 copy_aal_stats(&dev
->stats
.aal0
, &tmp
.aal0
);
170 copy_aal_stats(&dev
->stats
.aal34
, &tmp
.aal34
);
171 copy_aal_stats(&dev
->stats
.aal5
, &tmp
.aal5
);
173 error
= copy_to_user(arg
, &tmp
, sizeof(tmp
));
174 if (zero
&& !error
) {
175 subtract_aal_stats(&dev
->stats
.aal0
, &tmp
.aal0
);
176 subtract_aal_stats(&dev
->stats
.aal34
, &tmp
.aal34
);
177 subtract_aal_stats(&dev
->stats
.aal5
, &tmp
.aal5
);
179 return error
? -EFAULT
: 0;
183 int atm_dev_ioctl(unsigned int cmd
, void __user
*arg
)
186 int error
, len
, number
, size
= 0;
189 int *tmp_buf
, *tmp_p
;
190 struct atm_iobuf __user
*iobuf
= arg
;
191 struct atmif_sioc __user
*sioc
= arg
;
194 if (get_user(buf
, &iobuf
->buffer
))
196 if (get_user(len
, &iobuf
->length
))
198 down(&atm_dev_mutex
);
199 list_for_each(p
, &atm_devs
)
205 tmp_buf
= kmalloc(size
, GFP_ATOMIC
);
211 list_for_each(p
, &atm_devs
) {
212 dev
= list_entry(p
, struct atm_dev
, dev_list
);
213 *tmp_p
++ = dev
->number
;
216 error
= ((copy_to_user(buf
, tmp_buf
, size
)) ||
217 put_user(size
, &iobuf
->length
))
225 if (get_user(buf
, &sioc
->arg
))
227 if (get_user(len
, &sioc
->length
))
229 if (get_user(number
, &sioc
->number
))
232 if (!(dev
= try_then_request_module(atm_dev_lookup(number
),
233 "atm-device-%d", number
)))
238 size
= strlen(dev
->type
) + 1;
239 if (copy_to_user(buf
, dev
->type
, size
)) {
246 if (copy_to_user(buf
, dev
->esi
, size
)) {
255 for (i
= 0; i
< ESI_LEN
; i
++)
264 unsigned char esi
[ESI_LEN
];
266 if (!capable(CAP_NET_ADMIN
)) {
270 if (copy_from_user(esi
, buf
, ESI_LEN
)) {
274 memcpy(dev
->esi
, esi
, ESI_LEN
);
279 if (!capable(CAP_NET_ADMIN
)) {
285 size
= sizeof(struct atm_dev_stats
);
286 error
= fetch_stats(dev
, buf
, cmd
== ATM_GETSTATZ
);
291 size
= sizeof(struct atm_cirange
);
292 if (copy_to_user(buf
, &dev
->ci_range
, size
)) {
297 case ATM_GETLINKRATE
:
299 if (copy_to_user(buf
, &dev
->link_rate
, size
)) {
305 if (!capable(CAP_NET_ADMIN
)) {
309 atm_reset_addr(dev
, ATM_ADDR_LOCAL
);
313 case ATM_ADDLECSADDR
:
314 case ATM_DELLECSADDR
:
315 if (!capable(CAP_NET_ADMIN
)) {
320 struct sockaddr_atmsvc addr
;
322 if (copy_from_user(&addr
, buf
, sizeof(addr
))) {
326 if (cmd
== ATM_ADDADDR
|| cmd
== ATM_ADDLECSADDR
)
327 error
= atm_add_addr(dev
, &addr
,
328 (cmd
== ATM_ADDADDR
?
329 ATM_ADDR_LOCAL
: ATM_ADDR_LECS
));
331 error
= atm_del_addr(dev
, &addr
,
332 (cmd
== ATM_DELADDR
?
333 ATM_ADDR_LOCAL
: ATM_ADDR_LECS
));
337 case ATM_GETLECSADDR
:
338 error
= atm_get_addr(dev
, buf
, len
,
339 (cmd
== ATM_GETADDR
?
340 ATM_ADDR_LOCAL
: ATM_ADDR_LECS
));
344 /* may return 0, but later on size == 0 means "don't
346 error
= put_user(size
, &sioc
->length
)
350 if (__ATM_LM_XTRMT((int) (unsigned long) buf
) &&
351 __ATM_LM_XTLOC((int) (unsigned long) buf
) >
352 __ATM_LM_XTRMT((int) (unsigned long) buf
)) {
361 case SONET_SETFRAMING
:
362 if (!capable(CAP_NET_ADMIN
)) {
368 if (!dev
->ops
->ioctl
) {
372 size
= dev
->ops
->ioctl(dev
, cmd
, buf
);
374 error
= (size
== -ENOIOCTLCMD
? -EINVAL
: size
);
380 error
= put_user(size
, &sioc
->length
)
389 static __inline__
void *dev_get_idx(loff_t left
)
393 list_for_each(p
, &atm_devs
) {
397 return (p
!= &atm_devs
) ? p
: NULL
;
400 void *atm_dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
402 down(&atm_dev_mutex
);
403 return *pos
? dev_get_idx(*pos
) : (void *) 1;
406 void atm_dev_seq_stop(struct seq_file
*seq
, void *v
)
411 void *atm_dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
414 v
= (v
== (void *)1) ? atm_devs
.next
: ((struct list_head
*)v
)->next
;
415 return (v
== &atm_devs
) ? NULL
: v
;
419 EXPORT_SYMBOL(atm_dev_register
);
420 EXPORT_SYMBOL(atm_dev_deregister
);
421 EXPORT_SYMBOL(atm_dev_lookup
);