root/include/linux/if_addr.h

INCLUDED FROM

#ifndef __LINUX_IF_ADDR_H
#define __LINUX_IF_ADDR_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_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