/* AFS network device helpers
   *
   * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
   */
  
  #include <linux/string.h>
  #include <linux/rtnetlink.h>
  #include <linux/inetdevice.h>
  #include <linux/netdevice.h>
  #include <linux/if_arp.h>

  #include <net/net_namespace.h>

  #include "internal.h"

  /*
   * get a MAC address from a random ethernet interface that has a real one
   * - the buffer will normally be 6 bytes in size
   */
  int afs_get_MAC_address(u8 *mac, size_t maclen)

  {
  	struct net_device *dev;
  	int ret = -ENODEV;

  	BUG_ON(maclen != ETH_ALEN);

  	rtnl_lock();

  	dev = __dev_getfirstbyhwtype(&init_net, ARPHRD_ETHER);

  	if (dev) {

  		memcpy(mac, dev->dev_addr, maclen);

  		ret = 0;
  	}
  	rtnl_unlock();
  	return ret;
  }

  /*
   * get a list of this system's interface IPv4 addresses, netmasks and MTUs
   * - maxbufs must be at least 1
   * - returns the number of interface records in the buffer
   */

  int afs_get_ipv4_interfaces(struct afs_interface *bufs, size_t maxbufs,
  			    bool wantloopback)
  {
  	struct net_device *dev;
  	struct in_device *idev;
  	int n = 0;

  	ASSERT(maxbufs > 0);

  	rtnl_lock();

  	for_each_netdev(&init_net, dev) {

  		if (dev->type == ARPHRD_LOOPBACK && !wantloopback)
  			continue;
  		idev = __in_dev_get_rtnl(dev);
  		if (!idev)
  			continue;
  		for_primary_ifa(idev) {

  			bufs[n].address.s_addr = ifa->ifa_address;
  			bufs[n].netmask.s_addr = ifa->ifa_mask;
  			bufs[n].mtu = dev->mtu;
  			n++;

  			if (n >= maxbufs)
  				goto out;
  		} endfor_ifa(idev);

  	}
  out:
  	rtnl_unlock();
  	return n;
  }