include/uapi/linux/if_addr.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef __LINUX_IF_ADDR_H
   3 #define __LINUX_IF_ADDR_H
   4
   5 #include <linux/types.h>
   6 #include <linux/netlink.h>
   7
   8 struct ifaddrmsg {
   9         __u8            ifa_family;
  10         __u8            ifa_prefixlen;  /* The prefix length            */
  11         __u8            ifa_flags;      /* Flags                        */
  12         __u8            ifa_scope;      /* Address scope                */
  13         __u32           ifa_index;      /* Link index                   */
  14 };
  15
  16 /*
  17  * Important comment:
  18  * IFA_ADDRESS is prefix address, rather than local interface address.
  19  * It makes no difference for normally configured broadcast interfaces,
  20  * but for point-to-point IFA_ADDRESS is DESTINATION address,
  21  * local address is supplied in IFA_LOCAL attribute.
  22  *
  23  * IFA_FLAGS is a u32 attribute that extends the u8 field ifa_flags.
  24  * If present, the value from struct ifaddrmsg will be ignored.
  25  */
  26 enum {
  27         IFA_UNSPEC,
  28         IFA_ADDRESS,
  29         IFA_LOCAL,
  30         IFA_LABEL,
  31         IFA_BROADCAST,
  32         IFA_ANYCAST,
  33         IFA_CACHEINFO,
  34         IFA_MULTICAST,
  35         IFA_FLAGS,
  36         IFA_RT_PRIORITY,        /* u32, priority/metric for prefix route */
  37         IFA_TARGET_NETNSID,
  38         IFA_PROTO,              /* u8, address protocol */
  39         __IFA_MAX,
  40 };
  41
  42 #define IFA_MAX (__IFA_MAX - 1)
  43
  44 /* ifa_flags */
  45 #define IFA_F_SECONDARY         0x01
  46 #define IFA_F_TEMPORARY         IFA_F_SECONDARY
  47
  48 #define IFA_F_NODAD             0x02
  49 #define IFA_F_OPTIMISTIC        0x04
  50 #define IFA_F_DADFAILED         0x08
  51 #define IFA_F_HOMEADDRESS       0x10
  52 #define IFA_F_DEPRECATED        0x20
  53 #define IFA_F_TENTATIVE         0x40
  54 #define IFA_F_PERMANENT         0x80
  55 #define IFA_F_MANAGETEMPADDR    0x100
  56 #define IFA_F_NOPREFIXROUTE     0x200
  57 #define IFA_F_MCAUTOJOIN        0x400
  58 #define IFA_F_STABLE_PRIVACY    0x800
  59
  60 struct ifa_cacheinfo {
  61         __u32   ifa_prefered;
  62         __u32   ifa_valid;
  63         __u32   cstamp; /* created timestamp, hundredths of seconds */
  64         __u32   tstamp; /* updated timestamp, hundredths of seconds */
  65 };
  66
  67 /* backwards compatibility for userspace */
  68 #ifndef __KERNEL__
  69 #define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
  70 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
  71 #endif
  72
  73 /* ifa_proto */
  74 #define IFAPROT_UNSPEC          0
  75 #define IFAPROT_KERNEL_LO       1       /* loopback */
  76 #define IFAPROT_KERNEL_RA       2       /* set by kernel from router announcement */
  77 #define IFAPROT_KERNEL_LL       3       /* link-local set by kernel */
  78
  79 #endif