linux/include/linux/if_addr.h
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   1#ifndef __LINUX_IF_ADDR_H
   2#define __LINUX_IF_ADDR_H
   3
   4#include <linux/types.h>
   5#include <linux/netlink.h>
   6
   7struct ifaddrmsg {
   8        __u8            ifa_family;
   9        __u8            ifa_prefixlen;  /* The prefix length            */
  10        __u8            ifa_flags;      /* Flags                        */
  11        __u8            ifa_scope;      /* Address scope                */
  12        __u32           ifa_index;      /* Link index                   */
  13};
  14
  15/*
  16 * Important comment:
  17 * IFA_ADDRESS is prefix address, rather than local interface address.
  18 * It makes no difference for normally configured broadcast interfaces,
  19 * but for point-to-point IFA_ADDRESS is DESTINATION address,
  20 * local address is supplied in IFA_LOCAL attribute.
  21 */
  22enum {
  23        IFA_UNSPEC,
  24        IFA_ADDRESS,
  25        IFA_LOCAL,
  26        IFA_LABEL,
  27        IFA_BROADCAST,
  28        IFA_ANYCAST,
  29        IFA_CACHEINFO,
  30        IFA_MULTICAST,
  31        __IFA_MAX,
  32};
  33
  34#define IFA_MAX (__IFA_MAX - 1)
  35
  36/* ifa_flags */
  37#define IFA_F_SECONDARY         0x01
  38#define IFA_F_TEMPORARY         IFA_F_SECONDARY
  39
  40#define IFA_F_NODAD             0x02
  41#define IFA_F_OPTIMISTIC        0x04
  42#define IFA_F_DADFAILED         0x08
  43#define IFA_F_HOMEADDRESS       0x10
  44#define IFA_F_DEPRECATED        0x20
  45#define IFA_F_TENTATIVE         0x40
  46#define IFA_F_PERMANENT         0x80
  47
  48struct ifa_cacheinfo {
  49        __u32   ifa_prefered;
  50        __u32   ifa_valid;
  51        __u32   cstamp; /* created timestamp, hundredths of seconds */
  52        __u32   tstamp; /* updated timestamp, hundredths of seconds */
  53};
  54
  55/* backwards compatibility for userspace */
  56#ifndef __KERNEL__
  57#define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
  58#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
  59#endif
  60
  61#endif
  62
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