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 *
22 * IFA_FLAGS is a u32 attribute that extends the u8 field ifa_flags.
23 * If present, the value from struct ifaddrmsg will be ignored.
24 */
25enum {
26	IFA_UNSPEC,
27	IFA_ADDRESS,
28	IFA_LOCAL,
29	IFA_LABEL,
30	IFA_BROADCAST,
31	IFA_ANYCAST,
32	IFA_CACHEINFO,
33	IFA_MULTICAST,
34	IFA_FLAGS,
35	__IFA_MAX,
36};
37
38#define IFA_MAX (__IFA_MAX - 1)
39
40/* ifa_flags */
41#define IFA_F_SECONDARY		0x01
42#define IFA_F_TEMPORARY		IFA_F_SECONDARY
43
44#define	IFA_F_NODAD		0x02
45#define IFA_F_OPTIMISTIC	0x04
46#define IFA_F_DADFAILED		0x08
47#define	IFA_F_HOMEADDRESS	0x10
48#define IFA_F_DEPRECATED	0x20
49#define IFA_F_TENTATIVE		0x40
50#define IFA_F_PERMANENT		0x80
51#define IFA_F_MANAGETEMPADDR	0x100
52#define IFA_F_NOPREFIXROUTE	0x200
53
54struct ifa_cacheinfo {
55	__u32	ifa_prefered;
56	__u32	ifa_valid;
57	__u32	cstamp; /* created timestamp, hundredths of seconds */
58	__u32	tstamp; /* updated timestamp, hundredths of seconds */
59};
60
61/* backwards compatibility for userspace */
62#ifndef __KERNEL__
63#define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
64#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
65#endif
66
67#endif
68