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
   6 #include <linux/atm.h>
   7 #include <linux/atmdev.h>
   8 #include <linux/sched.h>
   9 #include <asm/uaccess.h>
  10
  11 #include "signaling.h"
  12 #include "addr.h"
  13
  14
  15 static int check_addr(struct sockaddr_atmsvc *addr)
  16 {
  17         int i;
  18
  19         if (addr->sas_family != AF_ATMSVC) return -EAFNOSUPPORT;
  20         if (!*addr->sas_addr.pub)
  21                 return *addr->sas_addr.prv ? 0 : -EINVAL;
  22         for (i = 1; i < ATM_E164_LEN+1; i++) /* make sure it's \0-terminated */
  23                 if (!addr->sas_addr.pub[i]) return 0;
  24         return -EINVAL;
  25 }
  26
  27
  28 static int identical(struct sockaddr_atmsvc *a,struct sockaddr_atmsvc *b)
  29 {
  30         if (*a->sas_addr.prv)
  31                 if (memcmp(a->sas_addr.prv,b->sas_addr.prv,ATM_ESA_LEN))
  32                         return 0;
  33         if (!*a->sas_addr.pub) return !*b->sas_addr.pub;
  34         if (!*b->sas_addr.pub) return 0;
  35         return !strcmp(a->sas_addr.pub,b->sas_addr.pub);
  36 }
  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
  48 void atm_reset_addr(struct atm_dev *dev)
  49 {
  50         unsigned long flags;
  51         struct atm_dev_addr *this;
  52
  53         spin_lock_irqsave(&dev->lock, flags);
  54         while (dev->local) {
  55                 this = dev->local;
  56                 dev->local = this->next;
  57                 kfree(this);
  58         }
  59         spin_unlock_irqrestore(&dev->lock, flags);
  60         notify_sigd(dev);
  61 }
  62
  63
  64 int atm_add_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)
  65 {
  66         unsigned long flags;
  67         struct atm_dev_addr **walk;
  68         int error;
  69
  70         error = check_addr(addr);
  71         if (error)
  72                 return error;
  73         spin_lock_irqsave(&dev->lock, flags);
  74         for (walk = &dev->local; *walk; walk = &(*walk)->next)
  75                 if (identical(&(*walk)->addr,addr)) {
  76                         spin_unlock_irqrestore(&dev->lock, flags);
  77                         return -EEXIST;
  78                 }
  79         *walk = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
  80         if (!*walk) {
  81                 spin_unlock_irqrestore(&dev->lock, flags);
  82                 return -ENOMEM;
  83         }
  84         (*walk)->addr = *addr;
  85         (*walk)->next = NULL;
  86         spin_unlock_irqrestore(&dev->lock, flags);
  87         notify_sigd(dev);
  88         return 0;
  89 }
  90
  91
  92 int atm_del_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)
  93 {
  94         unsigned long flags;
  95         struct atm_dev_addr **walk,*this;
  96         int error;
  97
  98         error = check_addr(addr);
  99         if (error)
 100                 return error;
 101         spin_lock_irqsave(&dev->lock, flags);
 102         for (walk = &dev->local; *walk; walk = &(*walk)->next)
 103                 if (identical(&(*walk)->addr,addr)) break;
 104         if (!*walk) {
 105                 spin_unlock_irqrestore(&dev->lock, flags);
 106                 return -ENOENT;
 107         }
 108         this = *walk;
 109         *walk = this->next;
 110         kfree(this);
 111         spin_unlock_irqrestore(&dev->lock, flags);
 112         notify_sigd(dev);
 113         return 0;
 114 }
 115
 116
 117 int atm_get_addr(struct atm_dev *dev,struct sockaddr_atmsvc *u_buf,int size)
 118 {
 119         unsigned long flags;
 120         struct atm_dev_addr *walk;
 121         int total = 0, error;
 122         struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
 123
 124
 125         spin_lock_irqsave(&dev->lock, flags);
 126         for (walk = dev->local; walk; walk = walk->next)
 127                 total += sizeof(struct sockaddr_atmsvc);
 128         tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
 129         if (!tmp_buf) {
 130                 spin_unlock_irqrestore(&dev->lock, flags);
 131                 return -ENOMEM;
 132         }
 133         for (walk = dev->local; walk; walk = walk->next)
 134                 memcpy(tmp_bufp++, &walk->addr, sizeof(struct sockaddr_atmsvc));
 135         spin_unlock_irqrestore(&dev->lock, flags);
 136         error = total > size ? -E2BIG : total;
 137         if (copy_to_user(u_buf, tmp_buf, total < size ? total : size))
 138                 error = -EFAULT;
 139         kfree(tmp_buf);
 140         return error;
 141 }