#ifndef __LINUX_IF_ADDR_H
  #define __LINUX_IF_ADDR_H

  #include <linux/types.h>

  #include <linux/netlink.h>

  struct ifaddrmsg {

  	__u8		ifa_family;
  	__u8		ifa_prefixlen;	/* The prefix length		*/
  	__u8		ifa_flags;	/* Flags			*/
  	__u8		ifa_scope;	/* Address scope		*/
  	__u32		ifa_index;	/* Link index			*/
  };
  
  /*
   * Important comment:
   * IFA_ADDRESS is prefix address, rather than local interface address.
   * It makes no difference for normally configured broadcast interfaces,
   * but for point-to-point IFA_ADDRESS is DESTINATION address,
   * local address is supplied in IFA_LOCAL attribute.
   */

  enum {

  	IFA_UNSPEC,
  	IFA_ADDRESS,
  	IFA_LOCAL,
  	IFA_LABEL,
  	IFA_BROADCAST,
  	IFA_ANYCAST,
  	IFA_CACHEINFO,
  	IFA_MULTICAST,
  	__IFA_MAX,
  };
  
  #define IFA_MAX (__IFA_MAX - 1)
  
  /* ifa_flags */
  #define IFA_F_SECONDARY		0x01
  #define IFA_F_TEMPORARY		IFA_F_SECONDARY

  #define	IFA_F_NODAD		0x02

  #define IFA_F_OPTIMISTIC	0x04

  #define IFA_F_DADFAILED		0x08

  #define	IFA_F_HOMEADDRESS	0x10

  #define IFA_F_DEPRECATED	0x20
  #define IFA_F_TENTATIVE		0x40
  #define IFA_F_PERMANENT		0x80

  struct ifa_cacheinfo {

  	__u32	ifa_prefered;
  	__u32	ifa_valid;
  	__u32	cstamp; /* created timestamp, hundredths of seconds */
  	__u32	tstamp; /* updated timestamp, hundredths of seconds */
  };

  /* backwards compatibility for userspace */
  #ifndef __KERNEL__
  #define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
  #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
  #endif

  #endif