linux/fs/afs/netdevices.c
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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 <net/net_namespace.h>
  12#include "internal.h"
  13
  14/*
  15 * get a MAC address from a random ethernet interface that has a real one
  16 * - the buffer will normally be 6 bytes in size
  17 */
  18int afs_get_MAC_address(u8 *mac, size_t maclen)
  19{
  20        struct net_device *dev;
  21        int ret = -ENODEV;
  22
  23        BUG_ON(maclen != ETH_ALEN);
  24
  25        rtnl_lock();
  26        dev = __dev_getfirstbyhwtype(&init_net, ARPHRD_ETHER);
  27        if (dev) {
  28                memcpy(mac, dev->dev_addr, maclen);
  29                ret = 0;
  30        }
  31        rtnl_unlock();
  32        return ret;
  33}
  34
  35/*
  36 * get a list of this system's interface IPv4 addresses, netmasks and MTUs
  37 * - maxbufs must be at least 1
  38 * - returns the number of interface records in the buffer
  39 */
  40int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
  41                            bool wantloopback)
  42{
  43        struct net_device *dev;
  44        struct in_device *idev;
  45        int n = 0;
  46
  47        ASSERT(maxbufs > 0);
  48
  49        rtnl_lock();
  50        for_each_netdev(&init_net, dev) {
  51                if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
  52                        continue;
  53                idev = __in_dev_get_rtnl(dev);
  54                if (!idev)
  55                        continue;
  56                for_primary_ifa(idev) {
  57                        bufs[n].address.s_addr = ifa->ifa_address;
  58                        bufs[n].netmask.s_addr = ifa->ifa_mask;
  59                        bufs[n].mtu = dev->mtu;
  60                        n++;
  61                        if (n >= maxbufs)
  62                                goto out;
  63                } endfor_ifa(idev);
  64        }
  65out:
  66        rtnl_unlock();
  67        return n;
  68}
  69
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