437 строки
9.4 KiB
C
437 строки
9.4 KiB
C
/* net/atm/resources.c - Statically allocated resources */
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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/* Fixes
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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* 2002/01 - don't free the whole struct sock on sk->destruct time,
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* use the default destruct function initialized by sock_init_data */
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#include <linux/ctype.h>
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#include <linux/string.h>
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#include <linux/atmdev.h>
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#include <linux/sonet.h>
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#include <linux/kernel.h> /* for barrier */
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/capability.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <net/sock.h> /* for struct sock */
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#include "common.h"
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#include "resources.h"
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#include "addr.h"
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LIST_HEAD(atm_devs);
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DEFINE_MUTEX(atm_dev_mutex);
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static struct atm_dev *__alloc_atm_dev(const char *type)
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{
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struct atm_dev *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->type = type;
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dev->signal = ATM_PHY_SIG_UNKNOWN;
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dev->link_rate = ATM_OC3_PCR;
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spin_lock_init(&dev->lock);
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INIT_LIST_HEAD(&dev->local);
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INIT_LIST_HEAD(&dev->lecs);
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return dev;
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}
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static struct atm_dev *__atm_dev_lookup(int number)
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{
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struct atm_dev *dev;
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struct list_head *p;
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list_for_each(p, &atm_devs) {
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dev = list_entry(p, struct atm_dev, dev_list);
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if (dev->number == number) {
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atm_dev_hold(dev);
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return dev;
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}
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}
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return NULL;
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}
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struct atm_dev *atm_dev_lookup(int number)
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{
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struct atm_dev *dev;
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mutex_lock(&atm_dev_mutex);
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dev = __atm_dev_lookup(number);
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mutex_unlock(&atm_dev_mutex);
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return dev;
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}
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struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
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int number, unsigned long *flags)
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{
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struct atm_dev *dev, *inuse;
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dev = __alloc_atm_dev(type);
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if (!dev) {
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printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
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type);
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return NULL;
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}
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mutex_lock(&atm_dev_mutex);
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if (number != -1) {
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if ((inuse = __atm_dev_lookup(number))) {
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atm_dev_put(inuse);
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mutex_unlock(&atm_dev_mutex);
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kfree(dev);
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return NULL;
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}
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dev->number = number;
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} else {
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dev->number = 0;
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while ((inuse = __atm_dev_lookup(dev->number))) {
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atm_dev_put(inuse);
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dev->number++;
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}
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}
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dev->ops = ops;
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if (flags)
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dev->flags = *flags;
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else
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memset(&dev->flags, 0, sizeof(dev->flags));
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memset(&dev->stats, 0, sizeof(dev->stats));
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atomic_set(&dev->refcnt, 1);
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if (atm_proc_dev_register(dev) < 0) {
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printk(KERN_ERR "atm_dev_register: "
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"atm_proc_dev_register failed for dev %s\n",
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type);
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goto out_fail;
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}
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if (atm_register_sysfs(dev) < 0) {
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printk(KERN_ERR "atm_dev_register: "
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"atm_register_sysfs failed for dev %s\n",
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type);
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atm_proc_dev_deregister(dev);
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goto out_fail;
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}
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list_add_tail(&dev->dev_list, &atm_devs);
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out:
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mutex_unlock(&atm_dev_mutex);
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return dev;
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out_fail:
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kfree(dev);
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dev = NULL;
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goto out;
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}
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void atm_dev_deregister(struct atm_dev *dev)
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{
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BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
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set_bit(ATM_DF_REMOVED, &dev->flags);
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/*
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* if we remove current device from atm_devs list, new device
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* with same number can appear, such we need deregister proc,
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* release async all vccs and remove them from vccs list too
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*/
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mutex_lock(&atm_dev_mutex);
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list_del(&dev->dev_list);
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mutex_unlock(&atm_dev_mutex);
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atm_dev_release_vccs(dev);
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atm_unregister_sysfs(dev);
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atm_proc_dev_deregister(dev);
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atm_dev_put(dev);
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}
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static void copy_aal_stats(struct k_atm_aal_stats *from,
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struct atm_aal_stats *to)
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{
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#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
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__AAL_STAT_ITEMS
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#undef __HANDLE_ITEM
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}
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static void subtract_aal_stats(struct k_atm_aal_stats *from,
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struct atm_aal_stats *to)
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{
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#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
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__AAL_STAT_ITEMS
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#undef __HANDLE_ITEM
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}
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static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, int zero)
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{
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struct atm_dev_stats tmp;
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int error = 0;
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copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
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copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
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copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
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if (arg)
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error = copy_to_user(arg, &tmp, sizeof(tmp));
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if (zero && !error) {
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subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
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subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
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subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
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}
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return error ? -EFAULT : 0;
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}
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int atm_dev_ioctl(unsigned int cmd, void __user *arg)
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{
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void __user *buf;
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int error, len, number, size = 0;
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struct atm_dev *dev;
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struct list_head *p;
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int *tmp_buf, *tmp_p;
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struct atm_iobuf __user *iobuf = arg;
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struct atmif_sioc __user *sioc = arg;
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switch (cmd) {
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case ATM_GETNAMES:
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if (get_user(buf, &iobuf->buffer))
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return -EFAULT;
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if (get_user(len, &iobuf->length))
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return -EFAULT;
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mutex_lock(&atm_dev_mutex);
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list_for_each(p, &atm_devs)
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size += sizeof(int);
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if (size > len) {
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mutex_unlock(&atm_dev_mutex);
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return -E2BIG;
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}
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tmp_buf = kmalloc(size, GFP_ATOMIC);
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if (!tmp_buf) {
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mutex_unlock(&atm_dev_mutex);
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return -ENOMEM;
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}
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tmp_p = tmp_buf;
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list_for_each(p, &atm_devs) {
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dev = list_entry(p, struct atm_dev, dev_list);
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*tmp_p++ = dev->number;
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}
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mutex_unlock(&atm_dev_mutex);
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error = ((copy_to_user(buf, tmp_buf, size)) ||
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put_user(size, &iobuf->length))
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? -EFAULT : 0;
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kfree(tmp_buf);
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return error;
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default:
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break;
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}
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if (get_user(buf, &sioc->arg))
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return -EFAULT;
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if (get_user(len, &sioc->length))
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return -EFAULT;
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if (get_user(number, &sioc->number))
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return -EFAULT;
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if (!(dev = try_then_request_module(atm_dev_lookup(number),
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"atm-device-%d", number)))
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return -ENODEV;
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switch (cmd) {
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case ATM_GETTYPE:
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size = strlen(dev->type) + 1;
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if (copy_to_user(buf, dev->type, size)) {
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error = -EFAULT;
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goto done;
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}
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break;
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case ATM_GETESI:
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size = ESI_LEN;
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if (copy_to_user(buf, dev->esi, size)) {
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error = -EFAULT;
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goto done;
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}
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break;
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case ATM_SETESI:
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{
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int i;
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for (i = 0; i < ESI_LEN; i++)
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if (dev->esi[i]) {
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error = -EEXIST;
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goto done;
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}
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}
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/* fall through */
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case ATM_SETESIF:
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{
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unsigned char esi[ESI_LEN];
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if (!capable(CAP_NET_ADMIN)) {
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error = -EPERM;
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goto done;
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}
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if (copy_from_user(esi, buf, ESI_LEN)) {
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error = -EFAULT;
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goto done;
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}
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memcpy(dev->esi, esi, ESI_LEN);
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error = ESI_LEN;
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goto done;
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}
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case ATM_GETSTATZ:
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if (!capable(CAP_NET_ADMIN)) {
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error = -EPERM;
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goto done;
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}
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/* fall through */
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case ATM_GETSTAT:
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size = sizeof(struct atm_dev_stats);
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error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
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if (error)
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goto done;
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break;
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case ATM_GETCIRANGE:
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size = sizeof(struct atm_cirange);
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if (copy_to_user(buf, &dev->ci_range, size)) {
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error = -EFAULT;
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goto done;
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}
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break;
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case ATM_GETLINKRATE:
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size = sizeof(int);
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if (copy_to_user(buf, &dev->link_rate, size)) {
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error = -EFAULT;
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goto done;
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}
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break;
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case ATM_RSTADDR:
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if (!capable(CAP_NET_ADMIN)) {
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error = -EPERM;
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goto done;
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}
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atm_reset_addr(dev, ATM_ADDR_LOCAL);
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break;
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case ATM_ADDADDR:
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case ATM_DELADDR:
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case ATM_ADDLECSADDR:
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case ATM_DELLECSADDR:
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if (!capable(CAP_NET_ADMIN)) {
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error = -EPERM;
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goto done;
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}
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{
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struct sockaddr_atmsvc addr;
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if (copy_from_user(&addr, buf, sizeof(addr))) {
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error = -EFAULT;
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goto done;
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}
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if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
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error = atm_add_addr(dev, &addr,
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(cmd == ATM_ADDADDR ?
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ATM_ADDR_LOCAL : ATM_ADDR_LECS));
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else
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error = atm_del_addr(dev, &addr,
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(cmd == ATM_DELADDR ?
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ATM_ADDR_LOCAL : ATM_ADDR_LECS));
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goto done;
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}
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case ATM_GETADDR:
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case ATM_GETLECSADDR:
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error = atm_get_addr(dev, buf, len,
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(cmd == ATM_GETADDR ?
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ATM_ADDR_LOCAL : ATM_ADDR_LECS));
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if (error < 0)
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goto done;
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size = error;
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/* may return 0, but later on size == 0 means "don't
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write the length" */
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error = put_user(size, &sioc->length)
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? -EFAULT : 0;
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goto done;
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case ATM_SETLOOP:
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if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
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__ATM_LM_XTLOC((int) (unsigned long) buf) >
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__ATM_LM_XTRMT((int) (unsigned long) buf)) {
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error = -EINVAL;
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goto done;
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}
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/* fall through */
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case ATM_SETCIRANGE:
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case SONET_GETSTATZ:
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case SONET_SETDIAG:
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case SONET_CLRDIAG:
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case SONET_SETFRAMING:
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if (!capable(CAP_NET_ADMIN)) {
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error = -EPERM;
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goto done;
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}
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/* fall through */
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default:
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if (!dev->ops->ioctl) {
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error = -EINVAL;
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goto done;
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}
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size = dev->ops->ioctl(dev, cmd, buf);
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if (size < 0) {
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error = (size == -ENOIOCTLCMD ? -EINVAL : size);
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goto done;
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}
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}
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if (size)
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error = put_user(size, &sioc->length)
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? -EFAULT : 0;
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else
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error = 0;
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done:
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atm_dev_put(dev);
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return error;
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}
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static __inline__ void *dev_get_idx(loff_t left)
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{
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struct list_head *p;
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list_for_each(p, &atm_devs) {
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if (!--left)
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break;
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}
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return (p != &atm_devs) ? p : NULL;
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}
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void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
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{
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mutex_lock(&atm_dev_mutex);
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return *pos ? dev_get_idx(*pos) : (void *) 1;
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}
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void atm_dev_seq_stop(struct seq_file *seq, void *v)
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{
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mutex_unlock(&atm_dev_mutex);
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}
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void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
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return (v == &atm_devs) ? NULL : v;
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}
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EXPORT_SYMBOL(atm_dev_register);
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EXPORT_SYMBOL(atm_dev_deregister);
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EXPORT_SYMBOL(atm_dev_lookup);
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