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      1 #ifndef __LINUX_IF_ADDR_H
      2 #define __LINUX_IF_ADDR_H
      3 
      4 #include <linux/netlink.h>
      5 
      6 struct ifaddrmsg
      7 {
      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 enum
     23 {
     24 	IFA_UNSPEC,
     25 	IFA_ADDRESS,
     26 	IFA_LOCAL,
     27 	IFA_LABEL,
     28 	IFA_BROADCAST,
     29 	IFA_ANYCAST,
     30 	IFA_CACHEINFO,
     31 	IFA_MULTICAST,
     32 	__IFA_MAX,
     33 };
     34 
     35 #define IFA_MAX (__IFA_MAX - 1)
     36 
     37 /* ifa_flags */
     38 #define IFA_F_SECONDARY		0x01
     39 #define IFA_F_TEMPORARY		IFA_F_SECONDARY
     40 
     41 #define	IFA_F_NODAD		0x02
     42 #define IFA_F_OPTIMISTIC	0x04
     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 
     48 struct ifa_cacheinfo
     49 {
     50 	__u32	ifa_prefered;
     51 	__u32	ifa_valid;
     52 	__u32	cstamp; /* created timestamp, hundredths of seconds */
     53 	__u32	tstamp; /* updated timestamp, hundredths of seconds */
     54 };
     55 
     56 /* backwards compatibility for userspace */
     57 #ifndef __KERNEL__
     58 #define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
     59 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
     60 #endif
     61 
     62 #endif
     63