diff options
Diffstat (limited to 'net/atm/resources.c')
| -rw-r--r-- | net/atm/resources.c | 432 |
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); |