release/src-rt-6.x.4708/linux/linux-2.6.36/net/atm/addr.c

   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
  13 static 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
  27 static 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
  39 static 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
  47 void 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
  67 int 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
 102 int 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
 132 int 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 }