[apple/xnu.git] / bsd / net / if_var.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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.
 *
 *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
 * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.7 2001/07/24 19:10:18 brooks Exp $
 */

#ifndef _NET_IF_VAR_H_
#define _NET_IF_VAR_H_
#include <sys/appleapiopts.h>

#ifdef __APPLE__
#define APPLE_IF_FAM_LOOPBACK  1
#define APPLE_IF_FAM_ETHERNET  2
#define APPLE_IF_FAM_SLIP      3
#define APPLE_IF_FAM_TUN       4
#define APPLE_IF_FAM_VLAN      5
#define APPLE_IF_FAM_PPP       6
#define APPLE_IF_FAM_PVC       7
#define APPLE_IF_FAM_DISC      8
#define APPLE_IF_FAM_MDECAP    9
#define APPLE_IF_FAM_GIF       10
#define APPLE_IF_FAM_FAITH     11
#define APPLE_IF_FAM_STF       12
#define APPLE_IF_FAM_FIREWIRE  13
#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, 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
 */

#ifdef __STDC__
/*
 * Forward structure declarations for function prototypes [sic].
 */
struct  mbuf;
struct  proc;
struct  rtentry;
struct  socket;
struct  ether_header;
struct  sockaddr_dl;
#endif

#define IFNAMSIZ        16

#include <sys/queue.h>          /* get TAILQ macros */

#ifdef __APPLE_API_UNSTABLE
#ifdef __APPLE__
struct tqdummy;

TAILQ_HEAD(tailq_head, tqdummy);

/* This belongs up in socket.h or socketvar.h, depending on how far the
 *   event bubbles up.
 */

struct net_event_data {
     u_long             if_family;
     u_long             if_unit;
     char               if_name[IFNAMSIZ];
};
#endif


TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
TAILQ_HEAD(ifprefixhead, ifprefix);
LIST_HEAD(ifmultihead, ifmultiaddr);

#ifdef __APPLE__
#ifdef KERNEL_PRIVATE
/* bottom 16 bits reserved for hardware checksum */
#define IF_HWASSIST_CSUM_IP             0x0001  /* will csum IP */
#define IF_HWASSIST_CSUM_TCP            0x0002  /* will csum TCP */
#define IF_HWASSIST_CSUM_UDP            0x0004  /* will csum UDP */
#define IF_HWASSIST_CSUM_IP_FRAGS       0x0008  /* will csum IP fragments */
#define IF_HWASSIST_CSUM_FRAGMENT       0x0010  /* will do IP fragmentation */
#define IF_HWASSIST_CSUM_TCP_SUM16      0x1000  /* simple TCP Sum16 computation */
#define IF_HWASSIST_CSUM_MASK           0xffff
#define IF_HWASSIST_CSUM_FLAGS(hwassist)        ((hwassist) & IF_HWASSIST_CSUM_MASK)

/* VLAN support */
#define IF_HWASSIST_VLAN_TAGGING        0x10000 /* supports VLAN tagging */
#define IF_HWASSIST_VLAN_MTU            0x20000 /* supports VLAN MTU-sized packet (for software VLAN) */
#endif KERNEL_PRIVATE
/*
 * 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 */
#ifdef __APPLE__
        u_char  ifi_typelen;            /* Length of frame type id */
#endif
        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 */
#ifdef __APPLE__
        u_long  ifi_recvtiming;         /* usec spent receiving when timing */
        u_long  ifi_xmittiming;         /* usec spent xmitting when timing */
#endif
        struct  timeval ifi_lastchange; /* time of last administrative change */
#ifdef __APPLE__
        u_long  default_proto;          /* Default dl_tag when none is specified 
                                                                 * on dlil_output */
#endif
        u_long  ifi_hwassist;           /* HW offload capabilities */
#ifdef KERNEL_PRIVATE
        u_short ifi_nvlans;             /* number of attached vlans */
        u_short ifi_reserved_1;         /* for future use */
#else KERNEL_PRIVATE
        u_long  ifi_reserved1;          /* for future use */
#endif KERNEL_PRIVATE
        u_long  ifi_reserved2;          /* for future use */
};
#endif

/*
 * 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'' */
        TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
        struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
#ifdef __APPLE__
        struct  tailq_head proto_head;  /* Head for if_proto structures */  
#endif
        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;

#ifdef __APPLE__
/* New with DLIL */
        int     refcnt;
        int     offercnt;
        int     (*if_output)(struct ifnet *ifnet_ptr, struct mbuf *m);
        int     (*if_ioctl)(struct ifnet *ifnet_ptr, u_long  ioctl_code, void  *ioctl_arg);
        int     (*if_set_bpf_tap)(struct ifnet *ifp, int mode, 
                                  int (*bpf_callback)(struct ifnet *, struct mbuf *));
        int     (*if_free)(struct ifnet *ifnet_ptr);
        int     (*if_demux)(struct ifnet  *ifnet_ptr, struct mbuf  *mbuf_ptr, 
                            char *frame_ptr, void  *if_proto_ptr);

        int     (*if_event)(struct ifnet  *ifnet_ptr, caddr_t  event_ptr);

        int     (*if_framer)(struct ifnet    *ifp,
                             struct mbuf     **m,
                             struct sockaddr *dest,
                             char            *dest_linkaddr,
                             char            *frame_type);

        u_long  if_family;              /* ulong assigned by Apple */
        struct tailq_head   if_flt_head;

/* End DLIL specific */

        void    *reserved0;     /* for future use */
        void    *if_private;    /* private to interface */
        long    if_eflags;              /* autoaddr, autoaddr done, etc. */
#endif /* __APPLE__ */

        struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
        int     if_amcount;             /* number of all-multicast requests */
/* procedure handles */
#ifndef __APPLE__
        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 *, u_long, caddr_t));
        void    (*if_watchdog)          /* timer routine */
                __P((struct ifnet *));
#endif
        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 *));
        int     (*if_resolvemulti)      /* validate/resolve multicast */
                __P((struct ifnet *, struct sockaddr **, struct sockaddr *));
        struct  ifqueue if_snd;         /* output queue */
        struct  ifqueue *if_poll_slowq; /* input queue for slow devices */
#ifdef __APPLE__
        u_long  family_cookie;  
        struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
        void *reserved1;        /* for future use */
#else
        struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
#endif /* __APPLE__ */
};
typedef void if_init_f_t __P((void *));

#define if_mtu          if_data.ifi_mtu
#define if_type         if_data.ifi_type
#define if_typelen      if_data.ifi_typelen
#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_hwassist     if_data.ifi_hwassist
#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
#ifdef KERNEL_PRIVATE
#define if_nvlans       if_data.ifi_nvlans
#endif KERNEL_PRIVATE
#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)

#ifndef __APPLE__
/* for compatibility with other BSDs */
#define if_addrlist     if_addrhead
#define if_list         if_link
#endif
#ifdef KERNEL_PRIVATE
/*
 * Structure describing a `cloning' interface.
 */
struct if_clone {
        LIST_ENTRY(if_clone) ifc_list;  /* on list of cloners */
        const char *ifc_name;           /* name of device, e.g. `vlan' */
        size_t ifc_namelen;             /* length of name */
        int ifc_minifs;                 /* minimum number of interfaces */
        int ifc_maxunit;                /* maximum unit number */
        unsigned char *ifc_units;       /* bitmap to handle units */
        int ifc_bmlen;                  /* bitmap length */

        int     (*ifc_create)(struct if_clone *, int);
        void    (*ifc_destroy)(struct ifnet *);
};

#define IF_CLONE_INITIALIZER(name, create, destroy, minifs, maxunit)    \
    { { 0 }, name, sizeof(name) - 1, minifs, maxunit, NULL, 0, create, destroy }
#endif

/*
 * 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--; \
        } \
}

#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 /* __APPLE_API_UNSTABLE */

/*
 * 72 was chosen below because it is the size of a TCP/IP
 * header (40) + the minimum mss (32).
 */
#define IF_MINMTU       72
#define IF_MAXMTU       65535

#endif /* KERNEL */

#ifdef __APPLE_API_UNSTABLE
/*
 * 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 */
#ifndef __APPLE__
        /* Use of if_data doesn't justify change of API */
        struct  if_data if_data;        /* not all members are meaningful */
#endif
        struct  ifnet *ifa_ifp;         /* back-pointer to interface */
        TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
        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;/* 16bit ref count, use ifaref, ifafree */
        int     ifa_metric;             /* cost of going out this interface */
#ifdef notdef
        struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
#endif
        u_long  ifa_dlt;
        int (*ifa_claim_addr)           /* check if an addr goes to this if */
                __P((struct ifaddr *, struct sockaddr *));
};
#define IFA_ROUTE       RTF_UP          /* route installed */

/*
 * The prefix structure contains information about one prefix
 * of an interface.  They are maintained by the different address families,
 * are allocated and attached when an prefix or an address is set,
 * and are linked together so all prefixes for an interface can be located.
 */
struct ifprefix {
        struct  sockaddr *ifpr_prefix;  /* prefix of interface */
        struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
        TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
        u_char  ifpr_plen;              /* prefix length in bits */
        u_char  ifpr_type;              /* protocol dependent prefix type */
};

/*
 * Multicast address structure.  This is analogous to the ifaddr
 * structure except that it keeps track of multicast addresses.
 * Also, the reference count here is a count of requests for this
 * address, not a count of pointers to this structure.
 */
struct ifmultiaddr {
        LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
        struct  sockaddr *ifma_addr;    /* address this membership is for */
        struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
        struct  ifnet *ifma_ifp;        /* back-pointer to interface */
        u_int   ifma_refcount;          /* reference count */
        void    *ifma_protospec;        /* protocol-specific state, if any */
};

#ifdef KERNEL
#define IFAREF(ifa) ifaref(ifa)
#define IFAFREE(ifa) ifafree(ifa)

#ifdef __APPLE_API_PRIVATE
extern  struct ifnethead ifnet;
extern struct   ifnet   **ifindex2ifnet;
extern  int ifqmaxlen;
extern  struct ifnet loif[];
extern  int if_index;
extern  struct ifaddr **ifnet_addrs;
#endif /* __APPLE_API_PRIVATE */

#ifndef __APPLE__
void    ether_ifattach __P((struct ifnet *, int));
void    ether_ifdetach __P((struct ifnet *, int));
void    ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *));
void    ether_demux __P((struct ifnet *, struct ether_header *, struct mbuf *));
int     ether_output __P((struct ifnet *,
           struct mbuf *, struct sockaddr *, struct rtentry *));
int     ether_output_frame __P((struct ifnet *, struct mbuf *));
int     ether_ioctl __P((struct ifnet *, int, caddr_t));
#endif

int     if_addmulti __P((struct ifnet *, struct sockaddr *,
                         struct ifmultiaddr **));
int     if_allmulti __P((struct ifnet *, int));
void    if_attach __P((struct ifnet *));
int     if_delmultiaddr __P((struct ifmultiaddr *ifma));
int     if_delmulti __P((struct ifnet *, struct sockaddr *));
void    if_down __P((struct ifnet *));
void    if_route __P((struct ifnet *, int flag, int fam));
void    if_unroute __P((struct ifnet *, int flag, int fam));
void    if_up __P((struct ifnet *));
/*void  ifinit __P((void));*/ /* declared in systm.h for main() */
int     ifioctl __P((struct socket *, u_long, caddr_t, struct proc *));
int     ifpromisc __P((struct ifnet *, int));
struct  ifnet *ifunit __P((const 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));
#ifdef KERNEL_PRIVATE
void    if_clone_attach(struct if_clone *);
void    if_clone_detach(struct if_clone *);
#endif KERNEL_PRIVATE

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 *));
void    ifaref __P((struct ifaddr *));

struct  ifmultiaddr *ifmaof_ifpforaddr __P((struct sockaddr *, 
                                            struct ifnet *));
#ifndef __APPLE__
int     if_simloop __P((struct ifnet *ifp, struct mbuf *m,
                struct sockaddr *dst, int hlen));
#endif

#endif /* KERNEL */


#endif /* __APPLE_API_UNSTABLE */
#endif /* !_NET_IF_VAR_H_ */