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/sched.h>
   8 #include <asm/uaccess.h>
   9
  10 #include "signaling.h"
  11 #include "addr.h"
  12
  13 static int check_addr(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(struct sockaddr_atmsvc *a, 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(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)
  48 {
  49         unsigned long flags;
  50         struct atm_dev_addr *this, *p;
  51
  52         spin_lock_irqsave(&dev->lock, flags);
  53         list_for_each_entry_safe(this, p, &dev->local, entry)
  54             kfree(this);
  55         spin_unlock_irqrestore(&dev->lock, flags);
  56         notify_sigd(dev);
  57 }
  58
  59 int atm_add_addr(struct atm_dev *dev, struct sockaddr_atmsvc *addr)
  60 {
  61         unsigned long flags;
  62         struct atm_dev_addr *this;
  63         int error;
  64
  65         error = check_addr(addr);
  66         if (error)
  67                 return error;
  68         spin_lock_irqsave(&dev->lock, flags);
  69         list_for_each_entry(this, &dev->local, entry) {
  70                 if (identical(&this->addr, addr)) {
  71                         spin_unlock_irqrestore(&dev->lock, flags);
  72                         return -EEXIST;
  73                 }
  74         }
  75         this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
  76         if (!this) {
  77                 spin_unlock_irqrestore(&dev->lock, flags);
  78                 return -ENOMEM;
  79         }
  80         this->addr = *addr;
  81         list_add(&this->entry, &dev->local);
  82         spin_unlock_irqrestore(&dev->lock, flags);
  83         notify_sigd(dev);
  84         return 0;
  85 }
  86
  87 int atm_del_addr(struct atm_dev *dev, struct sockaddr_atmsvc *addr)
  88 {
  89         unsigned long flags;
  90         struct atm_dev_addr *this;
  91         int error;
  92
  93         error = check_addr(addr);
  94         if (error)
  95                 return error;
  96         spin_lock_irqsave(&dev->lock, flags);
  97         list_for_each_entry(this, &dev->local, entry) {
  98                 if (identical(&this->addr, addr)) {
  99                         list_del(&this->entry);
 100                         spin_unlock_irqrestore(&dev->lock, flags);
 101                         kfree(this);
 102                         notify_sigd(dev);
 103                         return 0;
 104                 }
 105         }
 106         spin_unlock_irqrestore(&dev->lock, flags);
 107         return -ENOENT;
 108 }
 109
 110 int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
 111                  size_t size)
 112 {
 113         unsigned long flags;
 114         struct atm_dev_addr *this;
 115         int total = 0, error;
 116         struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
 117
 118         spin_lock_irqsave(&dev->lock, flags);
 119         list_for_each_entry(this, &dev->local, entry)
 120             total += sizeof(struct sockaddr_atmsvc);
 121         tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
 122         if (!tmp_buf) {
 123                 spin_unlock_irqrestore(&dev->lock, flags);
 124                 return -ENOMEM;
 125         }
 126         list_for_each_entry(this, &dev->local, entry)
 127             memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
 128         spin_unlock_irqrestore(&dev->lock, flags);
 129         error = total > size ? -E2BIG : total;
 130         if (copy_to_user(buf, tmp_buf, total < size ? total : size))
 131                 error = -EFAULT;
 132         kfree(tmp_buf);
 133         return error;
 134 }