text: /*
   * Copyright (c) 1982, 1986, 1989, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)if.h	8.1 (Berkeley) 6/10/93
   * $Id: if.h,v 1.36.2.3 1997/10/05 21:41:05 julian Exp $
   */
  
  #ifndef _NET_IF_H_
  #define	_NET_IF_H_
  
  /*
   * 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, rt)
   * 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
   */
  
  #ifndef _TIME_ /*  XXX fast fix for SNMP, going away soon */
  #include <sys/time.h>
  #endif
  #if 1 /* ALTQ */
  #include <altq/if_altq.h>
  #endif
  
  #ifdef __STDC__
  /*
   * Forward structure declarations for function prototypes [sic].
   */
  struct	mbuf;
  struct	proc;
  struct	rtentry;
  struct	socket;
  struct	ether_header;
  #endif
  
  /*
   * Structure describing information about an interface
   * which may be of interest to management entities.
   */
  struct if_data {
  	/* generic interface information */
  	u_char	ifi_type;		/* ethernet, tokenring, etc */
  	u_char	ifi_physical;		/* e.g., AUI, Thinnet, 10base-T, etc */
  	u_char	ifi_addrlen;		/* media address length */
  	u_char	ifi_hdrlen;		/* media header length */
  	u_char	ifi_recvquota;		/* polling quota for receive intrs */
  	u_char	ifi_xmitquota;		/* polling quota for xmit intrs */
  	u_long	ifi_mtu;		/* maximum transmission unit */
  	u_long	ifi_metric;		/* routing metric (external only) */
  	u_long	ifi_baudrate;		/* linespeed */
  	/* volatile statistics */
  	u_long	ifi_ipackets;		/* packets received on interface */
  	u_long	ifi_ierrors;		/* input errors on interface */
  	u_long	ifi_opackets;		/* packets sent on interface */
  	u_long	ifi_oerrors;		/* output errors on interface */
  	u_long	ifi_collisions;		/* collisions on csma interfaces */
  	u_long	ifi_ibytes;		/* total number of octets received */
  	u_long	ifi_obytes;		/* total number of octets sent */
  	u_long	ifi_imcasts;		/* packets received via multicast */
  	u_long	ifi_omcasts;		/* packets sent via multicast */
  	u_long	ifi_iqdrops;		/* dropped on input, this interface */
  	u_long	ifi_noproto;		/* destined for unsupported protocol */
  	u_long	ifi_recvtiming;		/* usec spent receiving when timing */
  	u_long	ifi_xmittiming;		/* usec spent xmitting when timing */
  	struct	timeval ifi_lastchange;	/* time of last administrative change */
  };
  
  /*
   * Structure defining a queue for a network interface.
   */
  struct	ifqueue {
  	struct	mbuf *ifq_head;
  	struct	mbuf *ifq_tail;
  	int	ifq_len;
  	int	ifq_maxlen;
  	int	ifq_drops;
  };
  
  /*
   * Structure defining a network interface.
   *
   * (Would like to call this struct ``if'', but C isn't PL/1.)
   */
  struct ifnet {
  	void	*if_softc;		/* pointer to driver state */
  	char	*if_name;		/* name, e.g. ``en'' or ``lo'' */
  	struct	ifnet *if_next;		/* all struct ifnets are chained */
  	struct	ifaddr *if_addrlist;	/* linked list of addresses per if */
          int	if_pcount;		/* number of promiscuous listeners */
  	struct	bpf_if *if_bpf;		/* packet filter structure */
  	u_short	if_index;		/* numeric abbreviation for this if  */
  	short	if_unit;		/* sub-unit for lower level driver */
  	short	if_timer;		/* time 'til if_watchdog called */
  	short	if_flags;		/* up/down, broadcast, etc. */
  	int	if_ipending;		/* interrupts pending */
  	void	*if_linkmib;		/* link-type-specific MIB data */
  	size_t	if_linkmiblen;		/* length of above data */
  	struct	if_data if_data;
  /* procedure handles */
  	int	(*if_output)		/* output routine (enqueue) */
  		__P((struct ifnet *, struct mbuf *, struct sockaddr *,
  		     struct rtentry *));
  	void	(*if_start)		/* initiate output routine */
  		__P((struct ifnet *));
  	int	(*if_done)		/* output complete routine */
  		__P((struct ifnet *));	/* (XXX not used; fake prototype) */
  	int	(*if_ioctl)		/* ioctl routine */
  		__P((struct ifnet *, int, caddr_t));
  	void	(*if_watchdog)		/* timer routine */
  		__P((struct ifnet *));
  	int	(*if_poll_recv)		/* polled receive routine */
  		__P((struct ifnet *, int *));
  	int	(*if_poll_xmit)		/* polled transmit routine */
  		__P((struct ifnet *, int *));
  	void	(*if_poll_intren)	/* polled interrupt reenable routine */
  		__P((struct ifnet *));
  	void	(*if_poll_slowinput)	/* input routine for slow devices */
  		__P((struct ifnet *, struct mbuf *));
  	void	(*if_init)		/* Init routine */
  		__P((void *));
  #if 1 /* ALTQ */
  	struct	ifaltq if_snd;		/* output queue (includes altq) */
  #else
  	struct	ifqueue if_snd;		/* output queue */
  #endif
  	struct	ifqueue *if_poll_slowq;	/* input queue for slow devices */
  
  	void	*if_afdata[AF_MAX];
  };
  typedef void if_init_f_t __P((void *));       
  
  #define	if_mtu		if_data.ifi_mtu
  #define	if_type		if_data.ifi_type
  #define if_physical	if_data.ifi_physical
  #define	if_addrlen	if_data.ifi_addrlen
  #define	if_hdrlen	if_data.ifi_hdrlen
  #define	if_metric	if_data.ifi_metric
  #define	if_baudrate	if_data.ifi_baudrate
  #define	if_ipackets	if_data.ifi_ipackets
  #define	if_ierrors	if_data.ifi_ierrors
  #define	if_opackets	if_data.ifi_opackets
  #define	if_oerrors	if_data.ifi_oerrors
  #define	if_collisions	if_data.ifi_collisions
  #define	if_ibytes	if_data.ifi_ibytes
  #define	if_obytes	if_data.ifi_obytes
  #define	if_imcasts	if_data.ifi_imcasts
  #define	if_omcasts	if_data.ifi_omcasts
  #define	if_iqdrops	if_data.ifi_iqdrops
  #define	if_noproto	if_data.ifi_noproto
  #define	if_lastchange	if_data.ifi_lastchange
  #define if_recvquota	if_data.ifi_recvquota
  #define	if_xmitquota	if_data.ifi_xmitquota
  #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
  
  #define	IFF_UP		0x1		/* interface is up */
  #define	IFF_BROADCAST	0x2		/* broadcast address valid */
  #define	IFF_DEBUG	0x4		/* turn on debugging */
  #define	IFF_LOOPBACK	0x8		/* is a loopback net */
  #define	IFF_POINTOPOINT	0x10		/* interface is point-to-point link */
  /*#define IFF_NOTRAILERS 0x20		 * obsolete: avoid use of trailers */
  #define	IFF_RUNNING	0x40		/* resources allocated */
  #define	IFF_NOARP	0x80		/* no address resolution protocol */
  #define	IFF_PROMISC	0x100		/* receive all packets */
  #define	IFF_ALLMULTI	0x200		/* receive all multicast packets */
  #define	IFF_OACTIVE	0x400		/* transmission in progress */
  #define	IFF_SIMPLEX	0x800		/* can't hear own transmissions */
  #define	IFF_LINK0	0x1000		/* per link layer defined bit */
  #define	IFF_LINK1	0x2000		/* per link layer defined bit */
  #define	IFF_LINK2	0x4000		/* per link layer defined bit */
  #define	IFF_ALTPHYS	IFF_LINK2	/* use alternate physical connection */
  #define	IFF_MULTICAST	0x8000		/* supports multicast */
  
  /* flags set internally only: */
  #define	IFF_CANTCHANGE \
  	(IFF_BROADCAST|IFF_POINTOPOINT|IFF_RUNNING|IFF_OACTIVE|\
  	    IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI)
  
  /*
   * These really don't belong here, but there's no other obviously appropriate
   * location.
   */
  #define IFP_AUI		0
  #define IFP_10BASE2	1
  #define IFP_10BASET	2
  /* etc. */
  
  /*
   * Bit values in if_ipending
   */
  #define	IFI_RECV	1	/* I want to receive */
  #define	IFI_XMIT	2	/* I want to transmit */
  
  /*
   * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
   * are 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_nextpkt = 0; \
  	if ((ifq)->ifq_tail == 0) \
  		(ifq)->ifq_head = m; \
  	else \
  		(ifq)->ifq_tail->m_nextpkt = m; \
  	(ifq)->ifq_tail = m; \
  	(ifq)->ifq_len++; \
  }
  #define	IF_PREPEND(ifq, m) { \
  	(m)->m_nextpkt = (ifq)->ifq_head; \
  	if ((ifq)->ifq_tail == 0) \
  		(ifq)->ifq_tail = (m); \
  	(ifq)->ifq_head = (m); \
  	(ifq)->ifq_len++; \
  }
  #define	IF_DEQUEUE(ifq, m) { \
  	(m) = (ifq)->ifq_head; \
  	if (m) { \
  		if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
  			(ifq)->ifq_tail = 0; \
  		(m)->m_nextpkt = 0; \
  		(ifq)->ifq_len--; \
  	} \
  }
  #define	IF_POLL(ifq, m)		((m) = (ifq)->ifq_head)
  #define	IF_PURGE(ifq)							\
  while (1) {								\
  	struct mbuf *m0;						\
  	IF_DEQUEUE((ifq), m0);						\
  	if (m0 == NULL)							\
  		break;							\
  	else								\
  		m_freem(m0);						\
  }
  #define	IF_IS_EMPTY(ifq)	((ifq)->ifq_len == 0)
  
  #ifdef KERNEL
  #define	IF_ENQ_DROP(ifq, m)	if_enq_drop(ifq, m)
  
  #if defined(__GNUC__) && defined(MT_HEADER)
  static __inline int
  if_queue_drop(struct ifqueue *ifq, struct mbuf *m)
  {
  	IF_DROP(ifq);
  	return 0;
  }
  
  static __inline int
  if_enq_drop(struct ifqueue *ifq, struct mbuf *m)
  {
  	if (IF_QFULL(ifq) &&
  	    !if_queue_drop(ifq, m))
  		return 0;
  	IF_ENQUEUE(ifq, m);
  	return 1;
  }
  #else
  
  #ifdef MT_HEADER
  int	if_enq_drop __P((struct ifqueue *, struct mbuf *));
  #endif
  
  #endif
  #endif /* KERNEL */
  
  #define	IFQ_MAXLEN	50
  #define	IFNET_SLOWHZ	1		/* granularity is 1 second */
  
  #ifdef KERNEL
  #ifdef ALTQ
  #define	ALTQ_DECL(x)		x
  
  #define	IFQ_ENQUEUE(ifq, m, pattr, err)					\
  do {									\
  	if (ALTQ_IS_ENABLED((ifq)))					\
  		ALTQ_ENQUEUE((ifq), (m), (pattr), (err));		\
  	else {								\
  		if (IF_QFULL((ifq))) {					\
  			m_freem((m));					\
  			(err) = ENOBUFS;				\
  		} else {						\
  			IF_ENQUEUE((ifq), (m));				\
  			(err) = 0;					\
  		}							\
  	}								\
  	if ((err))							\
  		(ifq)->ifq_drops++;					\
  } while (0)
  
  #define	IFQ_DEQUEUE(ifq, m)						\
  do {									\
  	if (TBR_IS_ENABLED((ifq)))					\
  		(m) = tbr_dequeue((ifq), ALTDQ_REMOVE);			\
  	else if (ALTQ_IS_ENABLED((ifq)))				\
  		ALTQ_DEQUEUE((ifq), (m));				\
  	else								\
  		IF_DEQUEUE((ifq), (m));					\
  } while (0)
  
  #define	IFQ_POLL(ifq, m)						\
  do {									\
  	if (TBR_IS_ENABLED((ifq)))					\
  		(m) = tbr_dequeue((ifq), ALTDQ_POLL);			\
  	else if (ALTQ_IS_ENABLED((ifq)))				\
  		ALTQ_POLL((ifq), (m));					\
  	else								\
  		IF_POLL((ifq), (m));					\
  } while (0)
  
  #define	IFQ_PURGE(ifq)							\
  do {									\
  	if (ALTQ_IS_ENABLED((ifq)))					\
  		ALTQ_PURGE((ifq));					\
  	else								\
  		IF_PURGE((ifq));					\
  } while (0)
  
  #define	IFQ_SET_READY(ifq)						\
  	do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
  
  #define	IFQ_CLASSIFY(ifq, m, af, pa)					\
  do {									\
  	if (ALTQ_IS_ENABLED((ifq))) {					\
  		if (ALTQ_NEEDS_CLASSIFY((ifq)))				\
  			(pa)->pattr_class = (*(ifq)->altq_classify)	\
  				((ifq)->altq_clfier, (m), (af));	\
  		(pa)->pattr_af = (af);					\
  		(pa)->pattr_hdr = mtod((m), caddr_t);			\
  	}								\
  } while (0)
  
  #else /* !ALTQ */
  #define	ALTQ_DECL(x)		/* nothing */
  
  #define	IFQ_ENQUEUE(ifq, m, pattr, err)					\
  do {									\
  	if (IF_QFULL((ifq))) {						\
  		m_freem((m));						\
  		(err) = ENOBUFS;					\
  	} else {							\
  		IF_ENQUEUE((ifq), (m));					\
  		(err) = 0;						\
  	}								\
  	if ((err))							\
  		(ifq)->ifq_drops++;					\
  } while (0)
  
  #define	IFQ_DEQUEUE(ifq, m)	IF_DEQUEUE((ifq), (m))
  
  #define	IFQ_POLL(ifq, m)	IF_POLL((ifq), (m))
  
  #define	IFQ_PURGE(ifq)							\
  while (1) {								\
  	struct mbuf *m0;						\
  	IF_DEQUEUE((ifq), m0);						\
  	if (m0 == NULL)							\
  		break;							\
  	else								\
  		m_freem(m0);						\
  }
  
  #define	IFQ_SET_READY(ifq)		((void)0)
  #define	IFQ_CLASSIFY(ifq, m, af, pa)	((void)0)
  
  #endif /* !ALTQ */
  
  #define	IFQ_IS_EMPTY(ifq)		((ifq)->ifq_len == 0)
  #define	IFQ_INC_LEN(ifq)		((ifq)->ifq_len++)
  #define	IFQ_DEC_LEN(ifq)		(--(ifq)->ifq_len)
  #define	IFQ_INC_DROPS(ifq)		((ifq)->ifq_drops++)
  #define	IFQ_SET_MAXLEN(ifq, len)	((ifq)->ifq_maxlen = (len))
  
  #endif /* KERNEL */
  
  /*
   * 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 */
  	struct	sockaddr *ifa_dstaddr;	/* other end of p-to-p link */
  #define	ifa_broadaddr	ifa_dstaddr	/* broadcast address interface */
  	struct	sockaddr *ifa_netmask;	/* used to determine subnet */
  	struct	ifnet *ifa_ifp;		/* back-pointer to interface */
  	struct	ifaddr *ifa_next;	/* next address for interface */
  	void	(*ifa_rtrequest)	/* check or clean routes (+ or -)'d */
  		__P((int, struct rtentry *, struct sockaddr *));
  	u_short	ifa_flags;		/* mostly rt_flags for cloning */
  	short	ifa_refcnt;		/* references to this structure */
  	int	ifa_metric;		/* cost of going out this interface */
  #ifdef notdef
  	struct	rtentry *ifa_rt;	/* XXXX for ROUTETOIF ????? */
  #endif
  	int (*ifa_claim_addr)		/* check if an addr goes to this if */
  		__P((struct ifaddr *, struct sockaddr *));
  
  };
  #define	IFA_ROUTE	RTF_UP		/* route installed */
  
  /*
   * Message format for use in obtaining information about interfaces
   * from getkerninfo and the routing socket
   */
  struct if_msghdr {
  	u_short	ifm_msglen;	/* to skip over non-understood messages */
  	u_char	ifm_version;	/* future binary compatability */
  	u_char	ifm_type;	/* message type */
  	int	ifm_addrs;	/* like rtm_addrs */
  	int	ifm_flags;	/* value of if_flags */
  	u_short	ifm_index;	/* index for associated ifp */
  	struct	if_data ifm_data;/* statistics and other data about if */
  };
  
  /*
   * Message format for use in obtaining information about interface addresses
   * from getkerninfo and the routing socket
   */
  struct ifa_msghdr {
  	u_short	ifam_msglen;	/* to skip over non-understood messages */
  	u_char	ifam_version;	/* future binary compatability */
  	u_char	ifam_type;	/* message type */
  	int	ifam_addrs;	/* like rtm_addrs */
  	int	ifam_flags;	/* value of ifa_flags */
  	u_short	ifam_index;	/* index for associated ifp */
  	int	ifam_metric;	/* value of ifa_metric */
  };
  
  /*
   * 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
  #define	IF_NAMESIZE	IFNAMSIZ
  	char	ifr_name[IFNAMSIZ];		/* if name, e.g. "en0" */
  	union {
  		struct	sockaddr ifru_addr;
  		struct	sockaddr ifru_dstaddr;
  		struct	sockaddr ifru_broadaddr;
  		short	ifru_flags;
  		int	ifru_metric;
  		int	ifru_mtu;
  		int	ifru_phys;
  		int	ifru_media;
  		caddr_t	ifru_data;
  	} 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_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_mtu		ifr_ifru.ifru_mtu	/* mtu */
  #define ifr_phys	ifr_ifru.ifru_phys	/* physical wire */
  #define ifr_media	ifr_ifru.ifru_media	/* physical media */
  #define	ifr_data	ifr_ifru.ifru_data	/* for use by interface */
  };
  
  struct ifaliasreq {
  	char	ifra_name[IFNAMSIZ];		/* if name, e.g. "en0" */
  	struct	sockaddr ifra_addr;
  	struct	sockaddr ifra_broadaddr;
  	struct	sockaddr ifra_mask;
  };
  
  struct ifmediareq {
  	char	ifm_name[IFNAMSIZ];	/* if name, e.g. "en0" */
  	int	ifm_current;		/* current media options */
  	int	ifm_mask;		/* don't care mask */
  	int	ifm_status;		/* media status */
  	int	ifm_active;		/* active options */
  	int	ifm_count;		/* # entries in ifm_ulist array */
  	int	*ifm_ulist;		/* media words */
  };
  /*
   * 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 */
  };
  
  /*
   * Structure for SIOC[AGD]LIFADDR
   */
  struct if_laddrreq {
  	char iflr_name[IFNAMSIZ];
  	unsigned int flags;
  #define IFLR_PREFIX	0x8000	/* in: prefix given  out: kernel fills id */
  	unsigned int prefixlen;		/* in/out */
  	struct sockaddr_storage addr;	/* in/out */
  	struct sockaddr_storage dstaddr; /* out */
  };
  
  #include <net/if_arp.h>
  
  #ifdef KERNEL
  #define	IFAFREE(ifa) \
  	if ((ifa)->ifa_refcnt <= 0) \
  		ifafree(ifa); \
  	else \
  		(ifa)->ifa_refcnt--;
  
  extern struct	ifnet	*ifnet;
  extern struct	ifnet	**ifindex2ifnet;
  extern int	ifqmaxlen;
  extern struct	ifnet	loif[];
  extern int	if_index;
  extern struct	ifaddr	**ifnet_addrs;
  
  void	ether_ifattach __P((struct ifnet *));
  void	ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *));
  int	ether_output __P((struct ifnet *,
  	   struct mbuf *, struct sockaddr *, struct rtentry *));
  int	ether_ioctl __P((struct ifnet *, int , caddr_t ));
  
  void	if_attach __P((struct ifnet *));
  void	if_attachdomain __P((void));
  void	if_down __P((struct ifnet *));
  void	if_up __P((struct ifnet *));
  #ifdef vax
  void	ifubareset __P((int));
  #endif
  /*void	ifinit __P((void));*/ /* declared in systm.h for main() */
  int	ifioctl __P((struct socket *, int, caddr_t, struct proc *));
  int	ifpromisc __P((struct ifnet *, int));
  struct	ifnet *ifunit __P((char *));
  struct  ifnet *if_withname __P((struct sockaddr *));
  
  int	if_poll_recv_slow __P((struct ifnet *ifp, int *quotap));
  void	if_poll_xmit_slow __P((struct ifnet *ifp, int *quotap));
  void	if_poll_throttle __P((void));
  void	if_poll_unthrottle __P((void *));
  void	if_poll_init __P((void));
  void	if_poll __P((void));
  
  struct	ifaddr *ifa_ifwithaddr __P((struct sockaddr *));
  struct	ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *));
  struct	ifaddr *ifa_ifwithnet __P((struct sockaddr *));
  struct	ifaddr *ifa_ifwithroute __P((int, struct sockaddr *,
  					struct sockaddr *));
  struct	ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *));
  void	ifafree __P((struct ifaddr *));
  
  int	looutput __P((struct ifnet *,
  	   struct mbuf *, struct sockaddr *, struct rtentry *));
  #else
  struct if_nameindex {
  	unsigned int	if_index;	/* 1, 2, ... */
  	char		*if_name;	/* null terminated name: "le0", ... */
  };
  
  __BEGIN_DECLS
  unsigned int if_nametoindex __P((const char *));
  char *if_indextoname __P((unsigned int, char *));
  struct if_nameindex *if_nameindex __P((void));
  void if_freenameindex __P((struct if_nameindex *));
  __END_DECLS
  #endif /* KERNEL */
  
  #endif /* !_NET_IF_H_ */
  