/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef	_NET_IF_H
#define	_NET_IF_H

#pragma ident	"@(#)if.h	1.25	06/02/15 SMI"
/* if.h 1.26 90/05/29 SMI; from UCB 7.1 6/4/86		*/

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Structures defining a network interface, providing a packet
 * transport mechanism (ala level 0 of the PUP protocols).
 *
 * Each interface accepts output datagrams of a specified maximum
 * length, and provides higher level routines with input datagrams
 * received from its medium.
 *
 * Output occurs when the routine if_output is called, with three parameters:
 *	(*ifp->if_output)(ifp, m, dst)
 * Here m is the mbuf chain to be sent and dst is the destination address.
 * The output routine encapsulates the supplied datagram if necessary,
 * and then transmits it on its medium.
 *
 * On input, each interface unwraps the data received by it, and either
 * places it on the input queue of a internetwork datagram routine
 * and posts the associated software interrupt, or passes the datagram to a raw
 * packet input routine.
 *
 * Routines exist for locating interfaces by their addresses
 * or for locating a interface on a certain network, as well as more general
 * routing and gateway routines maintaining information used to locate
 * interfaces.  These routines live in the files if.c and route.c
 */

/*
 * Structure defining a queue for a network interface.
 *
 * (Would like to call this struct ``if'', but C isn't PL/1.)
 */
struct ifnet {
	char	*if_name;		/* name, e.g. ``en'' or ``lo'' */
	short	if_unit;		/* sub-unit for lower level driver */
	short	if_mtu;			/* maximum transmission unit */
	short	if_flags;		/* up/down, broadcast, etc. */
	short	if_timer;		/* time 'til if_watchdog called */
	ushort_t if_promisc;		/* net # of requests for promisc mode */
	int	if_metric;		/* routing metric (external only) */
	struct	ifaddr *if_addrlist;	/* linked list of addresses per if */
	struct	ifqueue {
		struct	mbuf *ifq_head;
		struct	mbuf *ifq_tail;
		int	ifq_len;
		int	ifq_maxlen;
		int	ifq_drops;
	} if_snd;			/* output queue */
/* procedure handles */
	int	(*if_init)();		/* init routine */
	int	(*if_output)();		/* output routine */
	int	(*if_ioctl)();		/* ioctl routine */
	int	(*if_reset)();		/* bus reset routine */
	int	(*if_watchdog)();	/* timer routine */
/* generic interface statistics */
	int	if_ipackets;		/* packets received on interface */
	int	if_ierrors;		/* input errors on interface */
	int	if_opackets;		/* packets sent on interface */
	int	if_oerrors;		/* output errors on interface */
	int	if_collisions;		/* collisions on csma interfaces */
/* end statistics */
	struct	ifnet *if_next;
	struct	ifnet *if_upper;	/* next layer up */
	struct	ifnet *if_lower;	/* next layer down */
	int	(*if_input)();		/* input routine */
	int	(*if_ctlin)();		/* control input routine */
	int	(*if_ctlout)();		/* control output routine */
	struct map *if_memmap;		/* rmap for interface specific memory */
};

/*
 * NOTE : These flags are not directly used within IP.
 * ip_if.h has definitions derived from this which is used within IP.
 * If you define a flag here, you need to define one in ip_if.h before
 * using the new flag in IP. Don't use these flags directly in IP.
 */
#define	IFF_UP		0x00000001	/* interface is up */
#define	IFF_BROADCAST	0x00000002	/* broadcast address valid */
#define	IFF_DEBUG	0x00000004	/* turn on debugging */
#define	IFF_LOOPBACK	0x00000008	/* is a loopback net */

#define	IFF_POINTOPOINT	0x00000010	/* interface is point-to-point link */
#define	IFF_NOTRAILERS	0x00000020	/* avoid use of trailers */
#define	IFF_RUNNING	0x00000040	/* resources allocated */
#define	IFF_NOARP	0x00000080	/* no address resolution protocol */

#define	IFF_PROMISC	0x00000100	/* receive all packets */
#define	IFF_ALLMULTI	0x00000200	/* receive all multicast packets */
#define	IFF_INTELLIGENT	0x00000400	/* protocol code on board */
#define	IFF_MULTICAST	0x00000800	/* supports multicast */

#define	IFF_MULTI_BCAST	0x00001000	/* multicast using broadcast address */
#define	IFF_UNNUMBERED	0x00002000	/* non-unique address */
#define	IFF_DHCPRUNNING	0x00004000	/* DHCP controls this interface */
#define	IFF_PRIVATE	0x00008000	/* do not advertise */

/*
 * The following flags can't be grabbed or altered by SIOC[GS]IFFLAGS.
 * Should use SIOC[GS]LIFLAGS which has a larger flags field.
 */
#define	IFF_NOXMIT	0x00010000	/* Do not transmit packets */
#define	IFF_NOLOCAL	0x00020000	/* No address - just on-link subnet */
#define	IFF_DEPRECATED	0x00040000	/* interface address deprecated */
#define	IFF_ADDRCONF	0x00080000	/* address from stateless addrconf */

#define	IFF_ROUTER	0x00100000	/* router on this interface */
#define	IFF_NONUD	0x00200000	/* No NUD on this interface */
#define	IFF_ANYCAST	0x00400000	/* Anycast address */
#define	IFF_NORTEXCH	0x00800000	/* Do not exchange routing info */

#define	IFF_IPV4	0x01000000	/* IPv4 interface */
#define	IFF_IPV6	0x02000000	/* IPv6 interface */
#define	IFF_MIPRUNNING	0x04000000	/* Mobile IP controls this interface */
#define	IFF_NOFAILOVER	0x08000000	/* Don't failover on NIC failure */

#define	IFF_FAILED	0x10000000	/* NIC has failed */
#define	IFF_STANDBY	0x20000000	/* Standby NIC to be used on failures */
#define	IFF_INACTIVE	0x40000000	/* NIC active or not ? */
					/* Used for Standby NIC or */
					/* when FAILBACK is disabled by user */
#define	IFF_OFFLINE	0x80000000	/* NIC has been offlined */

/*
 * The IFF_MULTICAST flag indicates that the network can support the
 * transmission and reception of higher-level (e.g., IP) multicast packets.
 * It is independent of hardware support for multicasting; for example,
 * point-to-point links or pure broadcast networks may well support
 * higher-level multicasts.
 */

/* flags set internally only: */
#define	IFF_CANTCHANGE \
	(IFF_BROADCAST | IFF_POINTOPOINT | IFF_RUNNING | IFF_PROMISC | \
	IFF_MULTICAST | IFF_MULTI_BCAST | IFF_UNNUMBERED | IFF_IPV4 | \
	IFF_IPV6|IFF_INACTIVE)

/*
 * Output queues (ifp->if_snd) and internetwork datagram level (pup level 1)
 * input routines have queues of messages stored on ifqueue structures
 * (defined above).  Entries are added to and deleted from these structures
 * by these macros, which should be called with ipl raised to splimp().
 */
#define	IF_QFULL(ifq)		((ifq)->ifq_len >= (ifq)->ifq_maxlen)
#define	IF_DROP(ifq)		((ifq)->ifq_drops++)
#define	IF_ENQUEUE(ifq, m) { \
	(m)->m_act = 0; \
	if ((ifq)->ifq_tail == 0) \
		(ifq)->ifq_head = m; \
	else \
		(ifq)->ifq_tail->m_act = m; \
	(ifq)->ifq_tail = m; \
	(ifq)->ifq_len++; \
}
#define	IF_PREPEND(ifq, m) { \
	(m)->m_act = (ifq)->ifq_head; \
	if ((ifq)->ifq_tail == 0) \
		(ifq)->ifq_tail = (m); \
	(ifq)->ifq_head = (m); \
	(ifq)->ifq_len++; \
}

/*
 * Packets destined for level-1 protocol input routines
 * have a pointer to the receiving interface prepended to the data.
 * IF_DEQUEUEIF extracts and returns this pointer when dequeuing the packet.
 * IF_ADJ should be used otherwise to adjust for its presence.
 */
#define	IF_ADJ(m) { \
	(m)->m_off += sizeof (struct ifnet *); \
	(m)->m_len -= sizeof (struct ifnet *); \
	if ((m)->m_len == 0) { \
		struct mbuf *n; \
		MFREE((m), n); \
		(m) = n; \
	} \
}
#define	IF_DEQUEUEIF(ifq, m, ifp) { \
	(m) = (ifq)->ifq_head; \
	if (m) { \
		if (((ifq)->ifq_head = (m)->m_act) == 0) \
			(ifq)->ifq_tail = 0; \
		(m)->m_act = 0; \
		(ifq)->ifq_len--; \
		(ifp) = *(mtod((m), struct ifnet **)); \
		IF_ADJ(m); \
	} \
}
#define	IF_DEQUEUE(ifq, m) { \
	(m) = (ifq)->ifq_head; \
	if (m) { \
		if (((ifq)->ifq_head = (m)->m_act) == 0) \
			(ifq)->ifq_tail = 0; \
		(m)->m_act = 0; \
		(ifq)->ifq_len--; \
	} \
}

#define	IFQ_MAXLEN	50
#define	IFNET_SLOWHZ	1		/* granularity is 1 second */

/*
 * The ifaddr structure contains information about one address
 * of an interface.  They are maintained by the different address families,
 * are allocated and attached when an address is set, and are linked
 * together so all addresses for an interface can be located.
 */
struct ifaddr {
	struct	sockaddr ifa_addr;	/* address of interface */
	union {
		struct	sockaddr ifu_broadaddr;
		struct	sockaddr ifu_dstaddr;
	} ifa_ifu;
#define	ifa_broadaddr	ifa_ifu.ifu_broadaddr	/* broadcast address */
#define	ifa_dstaddr	ifa_ifu.ifu_dstaddr	/* other end of p-to-p link */
	struct	ifnet *ifa_ifp;		/* back-pointer to interface */
	struct	ifaddr *ifa_next;	/* next address for interface */
};

/*
 * The if_nameindex structure holds the interface index value about
 * a single interface. An array of this structure is used to return
 * all interfaces and indexes.
 */
struct if_nameindex {
	uint32_t	if_index;	/* positive interface index */
	char		*if_name;	/* if name, e.g. "en0" */
};

/*
 * For SIOCLIF*ND ioctls.
 *
 * The lnr_state_* fields use the ND_* neighbor reachability states.
 * The 3 different fields are for use with SIOCLIFSETND to cover the cases
 * when
 *	A new entry is created
 *	The entry already exists and the link-layer address is the same
 *	The entry already exists and the link-layer address differs
 *
 * Use ND_UNCHANGED and ND_ISROUTER_UNCHANGED to not change any state.
 */
#define	ND_MAX_HDW_LEN	64
typedef struct lif_nd_req {
	struct sockaddr_storage	lnr_addr;
	uint8_t			lnr_state_create;	/* When creating */
	uint8_t			lnr_state_same_lla;	/* Update same addr */
	uint8_t			lnr_state_diff_lla;	/* Update w/ diff. */
	int			lnr_hdw_len;
	int			lnr_flags;		/* See below */
	/* padding because ia32 "long long"s are only 4-byte aligned. */
	int			lnr_pad0;
	char			lnr_hdw_addr[ND_MAX_HDW_LEN];
} lif_nd_req_t;

/*
 * Neighbor reachability states
 * Used with SIOCLIF*ND ioctls.
 */
#define	ND_UNCHANGED	0	/* For ioctls that don't modify state */
#define	ND_INCOMPLETE	1	/* addr resolution in progress */
#define	ND_REACHABLE	2	/* have recently been reachable */
#define	ND_STALE	3	/* may be unreachable, don't do anything */
#define	ND_DELAY	4	/* wait for upper layer hint */
#define	ND_PROBE	5	/* send probes */
#define	ND_UNREACHABLE	6	/* delete this route */

#define	ND_STATE_VALID_MIN	0
#define	ND_STATE_VALID_MAX	6

/*
 * lnr_flags value of lif_nd_req.
 * Used with SIOCLIF*ND ioctls.
 */
#define	NDF_ISROUTER_ON		0x1
#define	NDF_ISROUTER_OFF	0x2
#define	NDF_ANYCAST_ON		0x4
#define	NDF_ANYCAST_OFF		0x8
#define	NDF_PROXY_ON		0x10
#define	NDF_PROXY_OFF		0x20

/* For SIOC[GS]LIFLNKINFO */
typedef struct lif_ifinfo_req {
	uint8_t		lir_maxhops;
	uint32_t	lir_reachtime;		/* Reachable time in msec */
	uint32_t	lir_reachretrans;	/* Retransmission timer msec */
	uint32_t	lir_maxmtu;
} lif_ifinfo_req_t;

/* Interface name size limit */
#define	LIFNAMSIZ	32

/*
 * Interface request structure used for socket
 * ioctl's.  All interface ioctl's must have parameter
 * definitions which begin with ifr_name.  The
 * remainder may be interface specific.
 * Note: This data structure uses 64bit type uint64_t which is not
 *	 a valid type for strict ANSI/ISO C compilation for ILP32.
 *	 Applications with ioctls using this structure that insist on
 *	 building with strict ANSI/ISO C (-Xc) will need to be LP64.
 */
#if defined(_LP64) || (__STDC__ - 0 == 0 && !defined(_NO_LONGLONG))
struct	lifreq {
	char	lifr_name[LIFNAMSIZ];		/* if name, e.g. "en0" */
	union {
		int	lifru_addrlen;		/* for subnet/token etc */
		uint_t	lifru_ppa;		/* SIOCSLIFNAME */
	} lifr_lifru1;
#define	lifr_addrlen	lifr_lifru1.lifru_addrlen
#define	lifr_ppa	lifr_lifru1.lifru_ppa	/* Driver's ppa */
	uint_t	lifr_movetoindex;		/* FAILOVER/FAILBACK ifindex */
	union {
		struct	sockaddr_storage lifru_addr;
		struct	sockaddr_storage lifru_dstaddr;
		struct	sockaddr_storage lifru_broadaddr;
		struct	sockaddr_storage lifru_token;	/* With lifr_addrlen */
		struct	sockaddr_storage lifru_subnet;	/* With lifr_addrlen */
		int	lifru_index;		/* interface index */
		uint64_t lifru_flags;		/* Flags for SIOC?LIFFLAGS */
		int	lifru_metric;
		uint_t	lifru_mtu;
		char	lifru_data[1];		/* interface dependent data */
		char	lifru_enaddr[6];
		int	lif_muxid[2];		/* mux id's for arp and ip */
		struct lif_nd_req	lifru_nd_req;
		struct lif_ifinfo_req	lifru_ifinfo_req;
		char	lifru_groupname[LIFNAMSIZ]; /* SIOC[GS]LIFGROUPNAME */
		uint_t	lifru_delay;		   /* SIOC[GS]LIFNOTIFYDELAY */
	} lifr_lifru;

#define	lifr_addr	lifr_lifru.lifru_addr	/* address */
#define	lifr_dstaddr	lifr_lifru.lifru_dstaddr /* other end of p-to-p link */
#define	lifr_broadaddr	lifr_lifru.lifru_broadaddr /* broadcast address */
#define	lifr_token	lifr_lifru.lifru_token	/* address token */
#define	lifr_subnet	lifr_lifru.lifru_subnet	/* subnet prefix */
#define	lifr_index	lifr_lifru.lifru_index	/* interface index */
#define	lifr_flags	lifr_lifru.lifru_flags	/* flags */
#define	lifr_metric	lifr_lifru.lifru_metric	/* metric */
#define	lifr_mtu	lifr_lifru.lifru_mtu	/* mtu */
#define	lifr_data	lifr_lifru.lifru_data	/* for use by interface */
#define	lifr_enaddr	lifr_lifru.lifru_enaddr	/* ethernet address */
#define	lifr_index	lifr_lifru.lifru_index	/* interface index */
#define	lifr_ip_muxid	lifr_lifru.lif_muxid[0]
#define	lifr_arp_muxid	lifr_lifru.lif_muxid[1]
#define	lifr_nd		lifr_lifru.lifru_nd_req	/* SIOCLIF*ND */
#define	lifr_ifinfo	lifr_lifru.lifru_ifinfo_req /* SIOC[GS]LIFLNKINFO */
#define	lifr_groupname	lifr_lifru.lifru_groupname
#define	lifr_delay	lifr_lifru.lifru_delay
};
#endif /* defined(_LP64) || (__STDC__ - 0 == 0 && !defined(_NO_LONGLONG)) */

/*
 * Argument structure for SIOCT* address testing ioctls.
 */
struct sioc_addrreq {
	struct sockaddr_storage	sa_addr;	/* Address to test */
	int			sa_res;		/* Result - 0/1 */
	int			sa_pad;
};

/*
 * Argument structure used by mrouted to get src-grp pkt counts using
 * SIOCGETLSGCNT. See <netinet/ip_mroute.h>.
 */
struct sioc_lsg_req {
	struct sockaddr_storage	slr_src;
	struct sockaddr_storage	slr_grp;
	uint_t			slr_pktcnt;
	uint_t			slr_bytecnt;
	uint_t			slr_wrong_if;
	uint_t			slr_pad;
};

/*
 * OBSOLETE: Replaced by struct lifreq. Supported for compatibility.
 *
 * Interface request structure used for socket
 * ioctl's.  All interface ioctl's must have parameter
 * definitions which begin with ifr_name.  The
 * remainder may be interface specific.
 */
struct	ifreq {
#define	IFNAMSIZ	16
	char	ifr_name[IFNAMSIZ];		/* if name, e.g. "en0" */
	union {
		struct	sockaddr ifru_addr;
		struct	sockaddr ifru_dstaddr;
		char	ifru_oname[IFNAMSIZ];	/* other if name */
		struct	sockaddr ifru_broadaddr;
		int	ifru_index;		/* interface index */
		short	ifru_flags;
		int	ifru_metric;
		char	ifru_data[1];		/* interface dependent data */
		char	ifru_enaddr[6];
		int	if_muxid[2];		/* mux id's for arp and ip */

		/* Struct for flags/ppa */
		struct ifr_ppaflags {
			short ifrup_flags;	/* Space of ifru_flags. */
			short ifrup_filler;
			uint_t ifrup_ppa;
		} ifru_ppaflags;

		/* Struct for FDDI ioctl's */
		struct ifr_dnld_reqs {
			uint32_t	v_addr;
			uint32_t	m_addr;
			uint32_t	ex_addr;
			uint32_t	size;
		} ifru_dnld_req;

		/* Struct for FDDI stats */
		struct ifr_fddi_stats {
			uint32_t stat_size;
			uint32_t fddi_stats;
		} ifru_fddi_stat;

		struct ifr_netmapents {
			uint32_t map_ent_size,	/* size of netmap structure */
				entry_number;	/* index into netmap list */
			uint32_t fddi_map_ent;	/* pointer to user structure */
		} ifru_netmapent;

		/* Field for generic ioctl for fddi */

		struct ifr_fddi_gen_struct {
			uint32_t ifru_fddi_gioctl; /* field for gen ioctl */
			uint32_t ifru_fddi_gaddr;  /* Generic ptr to a field */
		} ifru_fddi_gstruct;

	} ifr_ifru;

#define	ifr_addr	ifr_ifru.ifru_addr	/* address */
#define	ifr_dstaddr	ifr_ifru.ifru_dstaddr	/* other end of p-to-p link */
#define	ifr_oname	ifr_ifru.ifru_oname	/* other if name */
#define	ifr_broadaddr	ifr_ifru.ifru_broadaddr	/* broadcast address */
#define	ifr_flags	ifr_ifru.ifru_flags	/* flags */
#define	ifr_metric	ifr_ifru.ifru_metric	/* metric */
#define	ifr_data	ifr_ifru.ifru_data	/* for use by interface */
#define	ifr_enaddr	ifr_ifru.ifru_enaddr	/* ethernet address */
#define	ifr_index	ifr_ifru.ifru_index	/* interface index */
/* For setting ppa */
#define	ifr_ppa		ifr_ifru.ifru_ppaflags.ifrup_ppa

/* FDDI specific */
#define	ifr_dnld_req	ifr_ifru.ifru_dnld_req
#define	ifr_fddi_stat	ifr_ifru.ifru_fddi_stat
#define	ifr_fddi_netmap	ifr_ifru.ifru_netmapent	/* FDDI network map entries */
#define	ifr_fddi_gstruct ifr_ifru.ifru_fddi_gstruct

#define	ifr_ip_muxid	ifr_ifru.if_muxid[0]
#define	ifr_arp_muxid	ifr_ifru.if_muxid[1]
};

/* Used by SIOCGLIFNUM. Uses same flags as in struct lifconf */
struct lifnum {
	sa_family_t	lifn_family;
	int		lifn_flags;	/* request specific interfaces */
	int		lifn_count;	/* Result */
};

/*
 * Structure used in SIOCGLIFCONF request.
 * Used to retrieve interface configuration
 * for machine (useful for programs which
 * must know all networks accessible) for a given address family.
 * Using AF_UNSPEC will retrieve all address families.
 */
struct	lifconf {
	sa_family_t	lifc_family;
	int		lifc_flags;	/* request specific interfaces */
	int		lifc_len;	/* size of associated buffer */
	union {
		caddr_t	lifcu_buf;
		struct	lifreq *lifcu_req;
	} lifc_lifcu;
#define	lifc_buf lifc_lifcu.lifcu_buf	/* buffer address */
#define	lifc_req lifc_lifcu.lifcu_req	/* array of structures returned */
};

/* Flags */
#define	LIFC_NOXMIT	0x01		/* Include IFF_NOXMIT interfaces */
#define	LIFC_EXTERNAL_SOURCE	0x02	/* Exclude the interfaces which can't */
					/* be used to communicate outside the */
					/* node (exclude interfaces which are */
					/* IFF_NOXMIT, IFF_NOLOCAL, */
					/* IFF_LOOPBACK, IFF_DEPRECATED, or */
					/* not IFF_UP). Has priority over */
					/* LIFC_NOXMIT. */

#if defined(_SYSCALL32)

struct	lifconf32 {
	sa_family_t	lifc_family;
	int		lifc_flags;	/* request specific interfaces */
	int32_t	lifc_len;		/* size of associated buffer */
	union {
		caddr32_t lifcu_buf;
		caddr32_t lifcu_req;
	} lifc_lifcu;
};

#endif	/* _SYSCALL32 */

/*
 * OBSOLETE: Structure used in SIOCGIFCONF request.
 * Used to retrieve interface configuration
 * for machine (useful for programs which
 * must know all networks accessible).
 */
struct	ifconf {
	int	ifc_len;		/* size of associated buffer */
	union {
		caddr_t	ifcu_buf;
		struct	ifreq *ifcu_req;
	} ifc_ifcu;
#define	ifc_buf	ifc_ifcu.ifcu_buf	/* buffer address */
#define	ifc_req	ifc_ifcu.ifcu_req	/* array of structures returned */
};

#if defined(_SYSCALL32)

struct	ifconf32 {
	int32_t	ifc_len;		/* size of associated buffer */
	union {
		caddr32_t ifcu_buf;
		caddr32_t ifcu_req;
	} ifc_ifcu;
};

#endif	/* _SYSCALL32 */

typedef struct if_data {
				/* generic interface information */
	uchar_t	ifi_type;	/* ethernet, tokenring, etc */
	uchar_t	ifi_addrlen;	/* media address length */
	uchar_t	ifi_hdrlen;	/* media header length */
	uint_t	ifi_mtu;	/* maximum transmission unit */
	uint_t	ifi_metric;	/* routing metric (external only) */
	uint_t	ifi_baudrate;	/* linespeed */
				/* volatile statistics */
	uint_t	ifi_ipackets;	/* packets received on interface */
	uint_t	ifi_ierrors;	/* input errors on interface */
	uint_t	ifi_opackets;	/* packets sent on interface */
	uint_t	ifi_oerrors;	/* output errors on interface */
	uint_t	ifi_collisions;	/* collisions on csma interfaces */
	uint_t	ifi_ibytes;	/* total number of octets received */
	uint_t	ifi_obytes;	/* total number of octets sent */
	uint_t	ifi_imcasts;	/* packets received via multicast */
	uint_t	ifi_omcasts;	/* packets sent via multicast */
	uint_t	ifi_iqdrops;	/* dropped on input, this interface */
	uint_t	ifi_noproto;	/* destined for unsupported protocol */
	struct	timeval ifi_lastchange; /* last updated */
} if_data_t;

/*
 * Message format for use in obtaining information about interfaces
 * from the routing socket
 */
typedef struct if_msghdr {
	ushort_t ifm_msglen;	/* to skip over non-understood messages */
	uchar_t	ifm_version;	/* future binary compatibility */
	uchar_t	ifm_type;	/* message type */
	int	ifm_addrs;	/* like rtm_addrs */
	int	ifm_flags;	/* value of if_flags */
	ushort_t ifm_index;	/* index for associated ifp */
	struct	if_data ifm_data; /* statistics and other data about if */
} if_msghdr_t;

/*
 * Message format for use in obtaining information about interface addresses
 * from the routing socket
 */
typedef struct ifa_msghdr {
	ushort_t ifam_msglen;	/* to skip over non-understood messages */
	uchar_t	ifam_version;	/* future binary compatibility */
	uchar_t	ifam_type;	/* message type */
	int	ifam_addrs;	/* like rtm_addrs */
	int	ifam_flags;	/* route flags */
	ushort_t ifam_index;	/* index for associated ifp */
	int	ifam_metric;	/* value of ipif_metric */
} ifa_msghdr_t;

/* currently tunnels only support IPv4 or IPv6 */
enum ifta_proto {
	IFTAP_INVALID,
	IFTAP_IPV4,
	IFTAP_IPV6
};

#define	IFTUN_SECINFOLEN 8	/* In units of 32-bit words. */
#define	IFTUN_VERSION 1		/* Current version number. */

/*
 * Used by tunneling module to get/set a tunnel parameters using
 * SIOCTUN[SG]PARAM.
 *
 * There is a version number and an array of uint32_t at the end of this
 * ioctl because in a perfect world, the ipsec_req_t would be inside
 * tun_addreq.  Since this file is independent of IP (and IPsec), I have to
 * just leave room there, and have the appropriate handlers deal with the
 * security information.
 *
 * In the future, the sockaddr types and the ta_vers could be used together
 * to determine the nature of the security information that is at the end
 * of this ioctl.
 */
struct iftun_req {
	char		ifta_lifr_name[LIFNAMSIZ]; /* if name */
	struct sockaddr_storage ifta_saddr;	/* source address */
	struct sockaddr_storage ifta_daddr;	/* destination address */
	uint_t		ifta_flags;		/* See below */
	/* IP version information is read only */
	enum ifta_proto	ifta_upper;		/* IP version above tunnel */
	enum ifta_proto	ifta_lower;		/* IP version below tunnel */
	uint_t		ifta_vers;		/* Version number */
	uint32_t	ifta_secinfo[IFTUN_SECINFOLEN]; /* Security prefs. */
};

/* ifta_flags are set to indicate which members are valid */
#define	IFTUN_SRC			0x01
#define	IFTUN_DST			0x02
#define	IFTUN_SECURITY			0x04	/* Pay attention to secinfo */

/* Interface index identification API definitions */
extern	uint32_t	if_nametoindex(const char *ifname);
extern	char		*if_indextoname(uint32_t ifindex, char *ifname);
extern	struct if_nameindex	*if_nameindex(void);
extern	void		if_freenameindex(struct if_nameindex *ptr);

#define	IF_NAMESIZE	LIFNAMSIZ

#ifdef	__cplusplus
}
#endif

#endif	/* _NET_IF_H */
