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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 
      7 struct 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  */
     25 enum {
     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 #define IFA_F_MCAUTOJOIN	0x400
     54 #define IFA_F_STABLE_PRIVACY	0x800
     55 
     56 struct ifa_cacheinfo {
     57 	__u32	ifa_prefered;
     58 	__u32	ifa_valid;
     59 	__u32	cstamp; /* created timestamp, hundredths of seconds */
     60 	__u32	tstamp; /* updated timestamp, hundredths of seconds */
     61 };
     62 
     63 /* backwards compatibility for userspace */
     64 #define IFA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
     65 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
     66 
     67 #endif
     68