if_addr.h

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#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