LXR linux/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 */
  19int 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        }
  44out:
  45        rtnl_unlock();
  46        return n;
  47}
  48