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 80