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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/atm/resources.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/atm/resources.c')
-rw-r--r--net/atm/resources.c432
1 files changed, 432 insertions, 0 deletions
diff --git a/net/atm/resources.c b/net/atm/resources.c
new file mode 100644
index 00000000000..33f1685dbb7
--- /dev/null
+++ b/net/atm/resources.c
@@ -0,0 +1,432 @@
+/* net/atm/resources.c - Statically allocated resources */
+
+/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
+
+/* Fixes
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * 2002/01 - don't free the whole struct sock on sk->destruct time,
+ * use the default destruct function initialized by sock_init_data */
+
+
+#include <linux/config.h>
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/atmdev.h>
+#include <linux/sonet.h>
+#include <linux/kernel.h> /* for barrier */
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <net/sock.h> /* for struct sock */
+
+#include "common.h"
+#include "resources.h"
+#include "addr.h"
+
+
+LIST_HEAD(atm_devs);
+DEFINE_SPINLOCK(atm_dev_lock);
+
+static struct atm_dev *__alloc_atm_dev(const char *type)
+{
+ struct atm_dev *dev;
+
+ dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+ memset(dev, 0, sizeof(*dev));
+ dev->type = type;
+ dev->signal = ATM_PHY_SIG_UNKNOWN;
+ dev->link_rate = ATM_OC3_PCR;
+ spin_lock_init(&dev->lock);
+ INIT_LIST_HEAD(&dev->local);
+
+ return dev;
+}
+
+static void __free_atm_dev(struct atm_dev *dev)
+{
+ kfree(dev);
+}
+
+static struct atm_dev *__atm_dev_lookup(int number)
+{
+ struct atm_dev *dev;
+ struct list_head *p;
+
+ list_for_each(p, &atm_devs) {
+ dev = list_entry(p, struct atm_dev, dev_list);
+ if ((dev->ops) && (dev->number == number)) {
+ atm_dev_hold(dev);
+ return dev;
+ }
+ }
+ return NULL;
+}
+
+struct atm_dev *atm_dev_lookup(int number)
+{
+ struct atm_dev *dev;
+
+ spin_lock(&atm_dev_lock);
+ dev = __atm_dev_lookup(number);
+ spin_unlock(&atm_dev_lock);
+ return dev;
+}
+
+struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
+ int number, unsigned long *flags)
+{
+ struct atm_dev *dev, *inuse;
+
+ dev = __alloc_atm_dev(type);
+ if (!dev) {
+ printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
+ type);
+ return NULL;
+ }
+ spin_lock(&atm_dev_lock);
+ if (number != -1) {
+ if ((inuse = __atm_dev_lookup(number))) {
+ atm_dev_put(inuse);
+ spin_unlock(&atm_dev_lock);
+ __free_atm_dev(dev);
+ return NULL;
+ }
+ dev->number = number;
+ } else {
+ dev->number = 0;
+ while ((inuse = __atm_dev_lookup(dev->number))) {
+ atm_dev_put(inuse);
+ dev->number++;
+ }
+ }
+
+ dev->ops = ops;
+ if (flags)
+ dev->flags = *flags;
+ else
+ memset(&dev->flags, 0, sizeof(dev->flags));
+ memset(&dev->stats, 0, sizeof(dev->stats));
+ atomic_set(&dev->refcnt, 1);
+ list_add_tail(&dev->dev_list, &atm_devs);
+ spin_unlock(&atm_dev_lock);
+
+ if (atm_proc_dev_register(dev) < 0) {
+ printk(KERN_ERR "atm_dev_register: "
+ "atm_proc_dev_register failed for dev %s\n",
+ type);
+ spin_lock(&atm_dev_lock);
+ list_del(&dev->dev_list);
+ spin_unlock(&atm_dev_lock);
+ __free_atm_dev(dev);
+ return NULL;
+ }
+
+ return dev;
+}
+
+
+void atm_dev_deregister(struct atm_dev *dev)
+{
+ unsigned long warning_time;
+
+ atm_proc_dev_deregister(dev);
+
+ spin_lock(&atm_dev_lock);
+ list_del(&dev->dev_list);
+ spin_unlock(&atm_dev_lock);
+
+ warning_time = jiffies;
+ while (atomic_read(&dev->refcnt) != 1) {
+ msleep(250);
+ if ((jiffies - warning_time) > 10 * HZ) {
+ printk(KERN_EMERG "atm_dev_deregister: waiting for "
+ "dev %d to become free. Usage count = %d\n",
+ dev->number, atomic_read(&dev->refcnt));
+ warning_time = jiffies;
+ }
+ }
+
+ __free_atm_dev(dev);
+}
+
+void shutdown_atm_dev(struct atm_dev *dev)
+{
+ if (atomic_read(&dev->refcnt) > 1) {
+ set_bit(ATM_DF_CLOSE, &dev->flags);
+ return;
+ }
+ if (dev->ops->dev_close)
+ dev->ops->dev_close(dev);
+ atm_dev_deregister(dev);
+}
+
+
+static void copy_aal_stats(struct k_atm_aal_stats *from,
+ struct atm_aal_stats *to)
+{
+#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
+ __AAL_STAT_ITEMS
+#undef __HANDLE_ITEM
+}
+
+
+static void subtract_aal_stats(struct k_atm_aal_stats *from,
+ struct atm_aal_stats *to)
+{
+#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
+ __AAL_STAT_ITEMS
+#undef __HANDLE_ITEM
+}
+
+
+static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
+{
+ struct atm_dev_stats tmp;
+ int error = 0;
+
+ copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
+ copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
+ copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
+ if (arg)
+ error = copy_to_user(arg, &tmp, sizeof(tmp));
+ if (zero && !error) {
+ subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
+ subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
+ subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
+ }
+ return error ? -EFAULT : 0;
+}
+
+
+int atm_dev_ioctl(unsigned int cmd, void __user *arg)
+{
+ void __user *buf;
+ int error, len, number, size = 0;
+ struct atm_dev *dev;
+ struct list_head *p;
+ int *tmp_buf, *tmp_p;
+ struct atm_iobuf __user *iobuf = arg;
+ struct atmif_sioc __user *sioc = arg;
+ switch (cmd) {
+ case ATM_GETNAMES:
+ if (get_user(buf, &iobuf->buffer))
+ return -EFAULT;
+ if (get_user(len, &iobuf->length))
+ return -EFAULT;
+ spin_lock(&atm_dev_lock);
+ list_for_each(p, &atm_devs)
+ size += sizeof(int);
+ if (size > len) {
+ spin_unlock(&atm_dev_lock);
+ return -E2BIG;
+ }
+ tmp_buf = kmalloc(size, GFP_ATOMIC);
+ if (!tmp_buf) {
+ spin_unlock(&atm_dev_lock);
+ return -ENOMEM;
+ }
+ tmp_p = tmp_buf;
+ list_for_each(p, &atm_devs) {
+ dev = list_entry(p, struct atm_dev, dev_list);
+ *tmp_p++ = dev->number;
+ }
+ spin_unlock(&atm_dev_lock);
+ error = ((copy_to_user(buf, tmp_buf, size)) ||
+ put_user(size, &iobuf->length))
+ ? -EFAULT : 0;
+ kfree(tmp_buf);
+ return error;
+ default:
+ break;
+ }
+
+ if (get_user(buf, &sioc->arg))
+ return -EFAULT;
+ if (get_user(len, &sioc->length))
+ return -EFAULT;
+ if (get_user(number, &sioc->number))
+ return -EFAULT;
+
+ if (!(dev = atm_dev_lookup(number)))
+ return -ENODEV;
+
+ switch (cmd) {
+ case ATM_GETTYPE:
+ size = strlen(dev->type) + 1;
+ if (copy_to_user(buf, dev->type, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_GETESI:
+ size = ESI_LEN;
+ if (copy_to_user(buf, dev->esi, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_SETESI:
+ {
+ int i;
+
+ for (i = 0; i < ESI_LEN; i++)
+ if (dev->esi[i]) {
+ error = -EEXIST;
+ goto done;
+ }
+ }
+ /* fall through */
+ case ATM_SETESIF:
+ {
+ unsigned char esi[ESI_LEN];
+
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ if (copy_from_user(esi, buf, ESI_LEN)) {
+ error = -EFAULT;
+ goto done;
+ }
+ memcpy(dev->esi, esi, ESI_LEN);
+ error = ESI_LEN;
+ goto done;
+ }
+ case ATM_GETSTATZ:
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ /* fall through */
+ case ATM_GETSTAT:
+ size = sizeof(struct atm_dev_stats);
+ error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
+ if (error)
+ goto done;
+ break;
+ case ATM_GETCIRANGE:
+ size = sizeof(struct atm_cirange);
+ if (copy_to_user(buf, &dev->ci_range, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_GETLINKRATE:
+ size = sizeof(int);
+ if (copy_to_user(buf, &dev->link_rate, size)) {
+ error = -EFAULT;
+ goto done;
+ }
+ break;
+ case ATM_RSTADDR:
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ atm_reset_addr(dev);
+ break;
+ case ATM_ADDADDR:
+ case ATM_DELADDR:
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ {
+ struct sockaddr_atmsvc addr;
+
+ if (copy_from_user(&addr, buf, sizeof(addr))) {
+ error = -EFAULT;
+ goto done;
+ }
+ if (cmd == ATM_ADDADDR)
+ error = atm_add_addr(dev, &addr);
+ else
+ error = atm_del_addr(dev, &addr);
+ goto done;
+ }
+ case ATM_GETADDR:
+ error = atm_get_addr(dev, buf, len);
+ if (error < 0)
+ goto done;
+ size = error;
+ /* may return 0, but later on size == 0 means "don't
+ write the length" */
+ error = put_user(size, &sioc->length)
+ ? -EFAULT : 0;
+ goto done;
+ case ATM_SETLOOP:
+ if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
+ __ATM_LM_XTLOC((int) (unsigned long) buf) >
+ __ATM_LM_XTRMT((int) (unsigned long) buf)) {
+ error = -EINVAL;
+ goto done;
+ }
+ /* fall through */
+ case ATM_SETCIRANGE:
+ case SONET_GETSTATZ:
+ case SONET_SETDIAG:
+ case SONET_CLRDIAG:
+ case SONET_SETFRAMING:
+ if (!capable(CAP_NET_ADMIN)) {
+ error = -EPERM;
+ goto done;
+ }
+ /* fall through */
+ default:
+ if (!dev->ops->ioctl) {
+ error = -EINVAL;
+ goto done;
+ }
+ size = dev->ops->ioctl(dev, cmd, buf);
+ if (size < 0) {
+ error = (size == -ENOIOCTLCMD ? -EINVAL : size);
+ goto done;
+ }
+ }
+
+ if (size)
+ error = put_user(size, &sioc->length)
+ ? -EFAULT : 0;
+ else
+ error = 0;
+done:
+ atm_dev_put(dev);
+ return error;
+}
+
+static __inline__ void *dev_get_idx(loff_t left)
+{
+ struct list_head *p;
+
+ list_for_each(p, &atm_devs) {
+ if (!--left)
+ break;
+ }
+ return (p != &atm_devs) ? p : NULL;
+}
+
+void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ spin_lock(&atm_dev_lock);
+ return *pos ? dev_get_idx(*pos) : (void *) 1;
+}
+
+void atm_dev_seq_stop(struct seq_file *seq, void *v)
+{
+ spin_unlock(&atm_dev_lock);
+}
+
+void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ ++*pos;
+ v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
+ return (v == &atm_devs) ? NULL : v;
+}
+
+
+EXPORT_SYMBOL(atm_dev_register);
+EXPORT_SYMBOL(atm_dev_deregister);
+EXPORT_SYMBOL(atm_dev_lookup);
+EXPORT_SYMBOL(shutdown_atm_dev);