fs/afs/netdevices.c

   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 <net/net_namespace.h>
  12 #include "internal.h"
  13
  14 /*
  15  * get a list of this system's interface IPv4 addresses, netmasks and MTUs
  16  * - maxbufs must be at least 1
  17  * - returns the number of interface records in the buffer
  18  */
  19 int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
  20                             bool wantloopback)
  21 {
  22         struct net_device *dev;
  23         struct in_device *idev;
  24         int n = 0;
  25
  26         ASSERT(maxbufs > 0);
  27
  28         rtnl_lock();
  29         for_each_netdev(&init_net, dev) {
  30                 if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
  31                         continue;
  32                 idev = __in_dev_get_rtnl(dev);
  33                 if (!idev)
  34                         continue;
  35                 for_primary_ifa(idev) {
  36                         bufs[n].address.s_addr = ifa->ifa_address;
  37                         bufs[n].netmask.s_addr = ifa->ifa_mask;
  38                         bufs[n].mtu = dev->mtu;
  39                         n++;
  40                         if (n >= maxbufs)
  41                                 goto out;
  42                 } endfor_ifa(idev);
  43         }
  44 out:
  45         rtnl_unlock();
  46         return n;
  47 }