linux/net/atm/addr.c
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   1/* net/atm/addr.c - Local ATM address registry */
   2
   3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4
   5#include <linux/atm.h>
   6#include <linux/atmdev.h>
   7#include <linux/slab.h>
   8#include <linux/uaccess.h>
   9
  10#include "signaling.h"
  11#include "addr.h"
  12
  13static int check_addr(const struct sockaddr_atmsvc *addr)
  14{
  15        int i;
  16
  17        if (addr->sas_family != AF_ATMSVC)
  18                return -EAFNOSUPPORT;
  19        if (!*addr->sas_addr.pub)
  20                return *addr->sas_addr.prv ? 0 : -EINVAL;
  21        for (i = 1; i < ATM_E164_LEN + 1; i++)  /* make sure it's \0-terminated */
  22                if (!addr->sas_addr.pub[i])
  23                        return 0;
  24        return -EINVAL;
  25}
  26
  27static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
  28{
  29        if (*a->sas_addr.prv)
  30                if (memcmp(a->sas_addr.prv, b->sas_addr.prv, ATM_ESA_LEN))
  31                        return 0;
  32        if (!*a->sas_addr.pub)
  33                return !*b->sas_addr.pub;
  34        if (!*b->sas_addr.pub)
  35                return 0;
  36        return !strcmp(a->sas_addr.pub, b->sas_addr.pub);
  37}
  38
  39static void notify_sigd(const struct atm_dev *dev)
  40{
  41        struct sockaddr_atmpvc pvc;
  42
  43        pvc.sap_addr.itf = dev->number;
  44        sigd_enq(NULL, as_itf_notify, NULL, &pvc, NULL);
  45}
  46
  47void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
  48{
  49        unsigned long flags;
  50        struct atm_dev_addr *this, *p;
  51        struct list_head *head;
  52
  53        spin_lock_irqsave(&dev->lock, flags);
  54        if (atype == ATM_ADDR_LECS)
  55                head = &dev->lecs;
  56        else
  57                head = &dev->local;
  58        list_for_each_entry_safe(this, p, head, entry) {
  59                list_del(&this->entry);
  60                kfree(this);
  61        }
  62        spin_unlock_irqrestore(&dev->lock, flags);
  63        if (head == &dev->local)
  64                notify_sigd(dev);
  65}
  66
  67int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
  68                 enum atm_addr_type_t atype)
  69{
  70        unsigned long flags;
  71        struct atm_dev_addr *this;
  72        struct list_head *head;
  73        int error;
  74
  75        error = check_addr(addr);
  76        if (error)
  77                return error;
  78        spin_lock_irqsave(&dev->lock, flags);
  79        if (atype == ATM_ADDR_LECS)
  80                head = &dev->lecs;
  81        else
  82                head = &dev->local;
  83        list_for_each_entry(this, head, entry) {
  84                if (identical(&this->addr, addr)) {
  85                        spin_unlock_irqrestore(&dev->lock, flags);
  86                        return -EEXIST;
  87                }
  88        }
  89        this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
  90        if (!this) {
  91                spin_unlock_irqrestore(&dev->lock, flags);
  92                return -ENOMEM;
  93        }
  94        this->addr = *addr;
  95        list_add(&this->entry, head);
  96        spin_unlock_irqrestore(&dev->lock, flags);
  97        if (head == &dev->local)
  98                notify_sigd(dev);
  99        return 0;
 100}
 101
 102int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
 103                 enum atm_addr_type_t atype)
 104{
 105        unsigned long flags;
 106        struct atm_dev_addr *this;
 107        struct list_head *head;
 108        int error;
 109
 110        error = check_addr(addr);
 111        if (error)
 112                return error;
 113        spin_lock_irqsave(&dev->lock, flags);
 114        if (atype == ATM_ADDR_LECS)
 115                head = &dev->lecs;
 116        else
 117                head = &dev->local;
 118        list_for_each_entry(this, head, entry) {
 119                if (identical(&this->addr, addr)) {
 120                        list_del(&this->entry);
 121                        spin_unlock_irqrestore(&dev->lock, flags);
 122                        kfree(this);
 123                        if (head == &dev->local)
 124                                notify_sigd(dev);
 125                        return 0;
 126                }
 127        }
 128        spin_unlock_irqrestore(&dev->lock, flags);
 129        return -ENOENT;
 130}
 131
 132int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
 133                 size_t size, enum atm_addr_type_t atype)
 134{
 135        unsigned long flags;
 136        struct atm_dev_addr *this;
 137        struct list_head *head;
 138        int total = 0, error;
 139        struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
 140
 141        spin_lock_irqsave(&dev->lock, flags);
 142        if (atype == ATM_ADDR_LECS)
 143                head = &dev->lecs;
 144        else
 145                head = &dev->local;
 146        list_for_each_entry(this, head, entry)
 147            total += sizeof(struct sockaddr_atmsvc);
 148        tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
 149        if (!tmp_buf) {
 150                spin_unlock_irqrestore(&dev->lock, flags);
 151                return -ENOMEM;
 152        }
 153        list_for_each_entry(this, head, entry)
 154            memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
 155        spin_unlock_irqrestore(&dev->lock, flags);
 156        error = total > size ? -E2BIG : total;
 157        if (copy_to_user(buf, tmp_buf, total < size ? total : size))
 158                error = -EFAULT;
 159        kfree(tmp_buf);
 160        return error;
 161}
 162
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