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   1 /* AFS network device helpers
   2  *
   3  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   4  */
   5
   6 #include <linux/string.h>
   7 #include <linux/rtnetlink.h>
   8 #include <linux/inetdevice.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/if_arp.h>
  11 #include "internal.h"
  12
  13 int afs_get_MAC_address(u8 mac[ETH_ALEN])
  14 {
  15         struct net_device *dev;
  16         int ret = -ENODEV;
  17
  18         rtnl_lock();
  19         dev = __dev_getfirstbyhwtype(ARPHRD_ETHER);
  20         if (dev) {
  21                 memcpy(mac, dev->dev_addr, ETH_ALEN);
  22                 ret = 0;
  23         }
  24         rtnl_unlock();
  25         return ret;
  26 }
  27
  28 int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
  29                             bool wantloopback)
  30 {
  31         struct net_device *dev;
  32         struct in_device *idev;
  33         int n = 0;
  34
  35         rtnl_lock();
  36         for (dev = dev_base; dev; dev = dev->next) {
  37                 if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
  38                         continue;
  39                 idev = __in_dev_get_rtnl(dev);
  40                 if (!idev)
  41                         continue;
  42                 for_primary_ifa(idev) {
  43                         if (n == maxbufs)
  44                                 goto out;
  45                         bufs[n].address.s_addr = ifa->ifa_address;
  46                         bufs[n].netmask.s_addr = ifa->ifa_mask;
  47                         bufs[n].mtu = dev->mtu;
  48                         n++;
  49                 } endfor_ifa(idev)
  50         }
  51 out:
  52         rtnl_unlock();
  53         return n;
  54 }