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#define RTP_NONE	0	/* unset priority use sane default */
#define RTP_LOCAL	1	/* local address routes (must be the highest) */
#define RTP_CONNECTED	4	/* directly connected routes */
#define RTP_STATIC	8	/* static routes base priority */
#define RTP_EIGRP	28	/* EIGRP routes */
#define RTP_OSPF	32	/* OSPF routes */
#define RTP_ISIS	36	/* IS-IS routes */
#define RTP_RIP		40	/* RIP routes */
#define RTP_BGP		48	/* BGP routes */
#define RTP_DEFAULT	56	/* routes that have nothing set */
#define RTP_PROPOSAL_STATIC	57
#define RTP_PROPOSAL_DHCLIENT	58
#define RTP_PROPOSAL_SLAAC	59
#define RTP_PROPOSAL_UMB	60
#define RTP_PROPOSAL_PPP	61
#define RTP_PROPOSAL_SOLICIT	62	/* request reply of all RTM_PROPOSAL */
#define RTP_MAX		63	/* maximum priority */
#define RTP_ANY		64	/* any of the above */
#define RTP_MASK	0x7f
#define RTP_DOWN	0x80	/* route/link is down */

#define RTM_ADD		0x1	/* Add Route */
#define RTM_DELETE	0x2	/* Delete Route */
#define RTM_CHANGE	0x3	/* Change Metrics or flags */
#define RTM_GET		0x4	/* Report Metrics */
#define RTM_LOSING	0x5	/* Kernel Suspects Partitioning */
#define RTM_REDIRECT	0x6	/* Told to use different route */
#define RTM_MISS	0x7	/* Lookup failed on this address */
#define RTM_RESOLVE	0xb	/* req to resolve dst to LL addr */
#define RTM_NEWADDR	0xc	/* address being added to iface */
#define RTM_DELADDR	0xd	/* address being removed from iface */
#define RTM_IFINFO	0xe	/* iface going up/down etc. */
#define RTM_IFANNOUNCE	0xf	/* iface arrival/departure */
#define RTM_DESYNC	0x10	/* route socket buffer overflow */
#define RTM_INVALIDATE	0x11	/* Invalidate cache of L2 route */

struct rt_msghdr {
	u_short	rtm_msglen;	/* to skip over non-understood messages */
	u_char	rtm_version;	/* future binary compatibility */
	u_char	rtm_type;	/* message type */
	u_short	rtm_hdrlen;	/* sizeof(rt_msghdr) to skip over the header */
	u_short	rtm_index;	/* index for associated ifp */
	u_short rtm_tableid;	/* routing table id */
	u_char	rtm_priority;	/* routing priority */
	u_char	rtm_mpls;	/* MPLS additional infos */
	int	rtm_addrs;	/* bitmask identifying sockaddrs in msg */
	int	rtm_flags;	/* flags, incl. kern & message, e.g. DONE */
	int	rtm_fmask;	/* bitmask used in RTM_CHANGE message */
	pid_t	rtm_pid;	/* identify sender */
	int	rtm_seq;	/* for sender to identify action */
	int	rtm_errno;	/* why failed */
	u_int	rtm_inits;	/* which metrics we are initializing */
	struct	rt_metrics rtm_rmx; /* metrics themselves */
};

struct if_msghdr {
	u_short	ifm_msglen;	/* to skip over non-understood messages */
	u_char	ifm_version;	/* future binary compatibility */
	u_char	ifm_type;	/* message type */
	u_short ifm_hdrlen;	/* sizeof(if_msghdr) to skip over the header */
	u_short	ifm_index;	/* index for associated ifp */
	u_short	ifm_tableid;	/* routing table id */
	u_char	ifm_pad1;
	u_char	ifm_pad2;
	int	ifm_addrs;	/* like rtm_addrs */
	int	ifm_flags;	/* value of if_flags */
	int	ifm_xflags;
	struct	if_data ifm_data;/* statistics and other data about if */
};

struct ifa_msghdr {
	u_short	ifam_msglen;	/* to skip over non-understood messages */
	u_char	ifam_version;	/* future binary compatibility */
	u_char	ifam_type;	/* message type */
	u_short ifam_hdrlen;	/* sizeof(ifa_msghdr) to skip over the header */
	u_short	ifam_index;	/* index for associated ifp */
	u_short	ifam_tableid;	/* routing table id */
	u_char	ifam_pad1;
	u_char	ifam_pad2;
	int	ifam_addrs;	/* like rtm_addrs */
	int	ifam_flags;	/* value of ifa_flags */
	int	ifam_metric;	/* value of ifa_metric */
};

struct if_announcemsghdr {
	u_short	ifan_msglen;	/* to skip over non-understood messages */
	u_char	ifan_version;	/* future binary compatibility */
	u_char	ifan_type;	/* message type */
	u_short ifan_hdrlen;	/* sizeof(ifa_msghdr) to skip over the header */
	u_short	ifan_index;	/* index for associated ifp */
	u_short	ifan_what;	/* what type of announcement */
	char	ifan_name[IFNAMSIZ];	/* if name, e.g. "en0" */
};

struct rt_metrics {
	u_int64_t	rmx_pksent;	/* packets sent using this route */
	int64_t		rmx_expire;	/* lifetime for route, e.g. redirect */
	u_int		rmx_locks;	/* Kernel must leave these values */
	u_int		rmx_mtu;	/* MTU for this path */
	u_int		rmx_refcnt;	/* # references hold */
	u_int		rmx_hopcount;	/* max hops expected */
	u_int		rmx_recvpipe;	/* inbound delay-bandwidth product */
	u_int		rmx_sendpipe;	/* outbound delay-bandwidth product */
	u_int		rmx_ssthresh;	/* outbound gateway buffer limit */
	u_int		rmx_rtt;	/* estimated round trip time */
	u_int		rmx_rttvar;	/* estimated rtt variance */
	u_int		rmx_pad;
};

#define	RTF_UP        0x1       /* route usable */
#define	RTF_GATEWAY   0x2       /* destination is a gateway */
#define	RTF_HOST      0x4       /* host entry (net otherwise) */
#define	RTF_REJECT    0x8       /* host or net unreachable */
#define	RTF_DYNAMIC   0x10      /* created dynamically (by redirect) */
#define	RTF_MODIFIED  0x20      /* modified dynamically (by redirect) */
#define	RTF_DONE      0x40      /* message confirmed */
#define	RTF_CLONING   0x100     /* generate new routes on use */
#define	RTF_MULTICAST 0x200     /* route associated to a mcast addr.  */
#define	RTF_LLINFO    0x400     /* generated by ARP or NDP */
#define	RTF_STATIC    0x800     /* manually added */
#define	RTF_BLACKHOLE 0x1000    /* just discard pkts (during updates) */
#define	RTF_PROTO3    0x2000    /* protocol specific routing flag */
#define	RTF_PROTO2    0x4000    /* protocol specific routing flag */
#define	RTF_PROTO1    0x8000    /* protocol specific routing flag */
#define	RTF_CLONED    0x10000   /* this is a cloned route */
#define RTF_MPATH     0x40000   /* multipath route or operation */
#define RTF_MPLS      0x100000  /* MPLS additional infos */
#define RTF_LOCAL     0x200000	/* route to a local address */
#define RTF_BROADCAST 0x400000	/* route associated to a bcast addr. */
#define RTF_CONNECTED 0x800000	/* interface route */

#define RTV_MTU		0x1	/* init or lock _mtu */
#define RTV_HOPCOUNT	0x2	/* init or lock _hopcount */
#define RTV_EXPIRE	0x4	/* init or lock _expire */
#define RTV_RPIPE	0x8	/* init or lock _recvpipe */
#define RTV_SPIPE	0x10	/* init or lock _sendpipe */
#define RTV_SSTHRESH	0x20	/* init or lock _ssthresh */
#define RTV_RTT		0x40	/* init or lock _rtt */
#define RTV_RTTVAR	0x80	/* init or lock _rttvar */

#define RTA_DST		0x1	/* destination sockaddr present */
#define RTA_GATEWAY	0x2	/* gateway sockaddr present */
#define RTA_NETMASK	0x4	/* netmask sockaddr present */
#define RTA_IFP		0x10	/* interface name sockaddr present */
#define RTA_IFA		0x20	/* interface addr sockaddr present */
#define RTA_AUTHOR	0x40	/* sockaddr for author of redirect */
#define RTA_BRD		0x80	/* for NEWADDR, bcast or p-p dest addr */
#define RTA_SRC		0x100	/* source sockaddr present */
#define RTA_SRCMASK	0x200	/* source netmask present */
#define RTA_LABEL	0x400	/* route label present */