bsd/net/if_var.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1982, 1986, 1989, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
  55  * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.7 2001/07/24 19:10:18 brooks Exp $
  56  */
  57
  58 #ifndef _NET_IF_VAR_H_
  59 #define _NET_IF_VAR_H_
  60 #include <sys/appleapiopts.h>
  61
  62 #ifdef __APPLE__
  63 #define APPLE_IF_FAM_LOOPBACK  1
  64 #define APPLE_IF_FAM_ETHERNET  2
  65 #define APPLE_IF_FAM_SLIP      3
  66 #define APPLE_IF_FAM_TUN       4
  67 #define APPLE_IF_FAM_VLAN      5
  68 #define APPLE_IF_FAM_PPP       6
  69 #define APPLE_IF_FAM_PVC       7
  70 #define APPLE_IF_FAM_DISC      8
  71 #define APPLE_IF_FAM_MDECAP    9
  72 #define APPLE_IF_FAM_GIF       10
  73 #define APPLE_IF_FAM_FAITH     11
  74 #define APPLE_IF_FAM_STF       12
  75 #define APPLE_IF_FAM_FIREWIRE  13
  76 #endif
  77
  78 /*
  79  * Structures defining a network interface, providing a packet
  80  * transport mechanism (ala level 0 of the PUP protocols).
  81  *
  82  * Each interface accepts output datagrams of a specified maximum
  83  * length, and provides higher level routines with input datagrams
  84  * received from its medium.
  85  *
  86  * Output occurs when the routine if_output is called, with three parameters:
  87  *      (*ifp->if_output)(ifp, m, dst, rt)
  88  * Here m is the mbuf chain to be sent and dst is the destination address.
  89  * The output routine encapsulates the supplied datagram if necessary,
  90  * and then transmits it on its medium.
  91  *
  92  * On input, each interface unwraps the data received by it, and either
  93  * places it on the input queue of a internetwork datagram routine
  94  * and posts the associated software interrupt, or passes the datagram to a raw
  95  * packet input routine.
  96  *
  97  * Routines exist for locating interfaces by their addresses
  98  * or for locating a interface on a certain network, as well as more general
  99  * routing and gateway routines maintaining information used to locate
 100  * interfaces.  These routines live in the files if.c and route.c
 101  */
 102
 103 #ifdef __STDC__
 104 /*
 105  * Forward structure declarations for function prototypes [sic].
 106  */
 107 struct  mbuf;
 108 struct  proc;
 109 struct  rtentry;
 110 struct  socket;
 111 struct  ether_header;
 112 struct  sockaddr_dl;
 113 #endif
 114
 115 #define IFNAMSIZ        16
 116
 117 #include <sys/queue.h>          /* get TAILQ macros */
 118
 119 #ifdef __APPLE_API_UNSTABLE
 120 #ifdef __APPLE__
 121 struct tqdummy;
 122
 123 TAILQ_HEAD(tailq_head, tqdummy);
 124
 125 /* This belongs up in socket.h or socketvar.h, depending on how far the
 126  *   event bubbles up.
 127  */
 128
 129 struct net_event_data {
 130      u_long             if_family;
 131      u_long             if_unit;
 132      char               if_name[IFNAMSIZ];
 133 };
 134 #endif
 135
 136
 137 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 138 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
 139 TAILQ_HEAD(ifprefixhead, ifprefix);
 140 LIST_HEAD(ifmultihead, ifmultiaddr);
 141
 142 #ifdef __APPLE__
 143 #ifdef KERNEL_PRIVATE
 144 /* bottom 16 bits reserved for hardware checksum */
 145 #define IF_HWASSIST_CSUM_IP             0x0001  /* will csum IP */
 146 #define IF_HWASSIST_CSUM_TCP            0x0002  /* will csum TCP */
 147 #define IF_HWASSIST_CSUM_UDP            0x0004  /* will csum UDP */
 148 #define IF_HWASSIST_CSUM_IP_FRAGS       0x0008  /* will csum IP fragments */
 149 #define IF_HWASSIST_CSUM_FRAGMENT       0x0010  /* will do IP fragmentation */
 150 #define IF_HWASSIST_CSUM_TCP_SUM16      0x1000  /* simple TCP Sum16 computation */
 151 #define IF_HWASSIST_CSUM_MASK           0xffff
 152 #define IF_HWASSIST_CSUM_FLAGS(hwassist)        ((hwassist) & IF_HWASSIST_CSUM_MASK)
 153
 154 /* VLAN support */
 155 #define IF_HWASSIST_VLAN_TAGGING        0x10000 /* supports VLAN tagging */
 156 #define IF_HWASSIST_VLAN_MTU            0x20000 /* supports VLAN MTU-sized packet (for software VLAN) */
 157 #endif KERNEL_PRIVATE
 158 /*
 159  * Structure describing information about an interface
 160  * which may be of interest to management entities.
 161  */
 162 struct if_data {
 163         /* generic interface information */
 164         u_char  ifi_type;               /* ethernet, tokenring, etc */
 165 #ifdef __APPLE__
 166         u_char  ifi_typelen;            /* Length of frame type id */
 167 #endif
 168         u_char  ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */
 169         u_char  ifi_addrlen;            /* media address length */
 170         u_char  ifi_hdrlen;             /* media header length */
 171         u_char  ifi_recvquota;          /* polling quota for receive intrs */
 172         u_char  ifi_xmitquota;          /* polling quota for xmit intrs */
 173         u_long  ifi_mtu;                /* maximum transmission unit */
 174         u_long  ifi_metric;             /* routing metric (external only) */
 175         u_long  ifi_baudrate;           /* linespeed */
 176         /* volatile statistics */
 177         u_long  ifi_ipackets;           /* packets received on interface */
 178         u_long  ifi_ierrors;            /* input errors on interface */
 179         u_long  ifi_opackets;           /* packets sent on interface */
 180         u_long  ifi_oerrors;            /* output errors on interface */
 181         u_long  ifi_collisions;         /* collisions on csma interfaces */
 182         u_long  ifi_ibytes;             /* total number of octets received */
 183         u_long  ifi_obytes;             /* total number of octets sent */
 184         u_long  ifi_imcasts;            /* packets received via multicast */
 185         u_long  ifi_omcasts;            /* packets sent via multicast */
 186         u_long  ifi_iqdrops;            /* dropped on input, this interface */
 187         u_long  ifi_noproto;            /* destined for unsupported protocol */
 188 #ifdef __APPLE__
 189         u_long  ifi_recvtiming;         /* usec spent receiving when timing */
 190         u_long  ifi_xmittiming;         /* usec spent xmitting when timing */
 191 #endif
 192         struct  timeval ifi_lastchange; /* time of last administrative change */
 193 #ifdef __APPLE__
 194         u_long  default_proto;          /* Default dl_tag when none is specified
 195                                                                  * on dlil_output */
 196 #endif
 197         u_long  ifi_hwassist;           /* HW offload capabilities */
 198 #ifdef KERNEL_PRIVATE
 199         u_short ifi_nvlans;             /* number of attached vlans */
 200         u_short ifi_reserved_1;         /* for future use */
 201 #else KERNEL_PRIVATE
 202         u_long  ifi_reserved1;          /* for future use */
 203 #endif KERNEL_PRIVATE
 204         u_long  ifi_reserved2;          /* for future use */
 205 };
 206 #endif
 207
 208 /*
 209  * Structure defining a queue for a network interface.
 210  */
 211 struct  ifqueue {
 212         struct  mbuf *ifq_head;
 213         struct  mbuf *ifq_tail;
 214         int     ifq_len;
 215         int     ifq_maxlen;
 216         int     ifq_drops;
 217 };
 218
 219 /*
 220  * Structure defining a network interface.
 221  *
 222  * (Would like to call this struct ``if'', but C isn't PL/1.)
 223  */
 224 struct ifnet {
 225         void    *if_softc;              /* pointer to driver state */
 226         char    *if_name;               /* name, e.g. ``en'' or ``lo'' */
 227         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 228         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
 229 #ifdef __APPLE__
 230         struct  tailq_head proto_head;  /* Head for if_proto structures */
 231 #endif
 232         int     if_pcount;              /* number of promiscuous listeners */
 233         struct  bpf_if *if_bpf;         /* packet filter structure */
 234         u_short if_index;               /* numeric abbreviation for this if  */
 235         short   if_unit;                /* sub-unit for lower level driver */
 236         short   if_timer;               /* time 'til if_watchdog called */
 237         short   if_flags;               /* up/down, broadcast, etc. */
 238         int     if_ipending;            /* interrupts pending */
 239         void    *if_linkmib;            /* link-type-specific MIB data */
 240         size_t  if_linkmiblen;          /* length of above data */
 241         struct  if_data if_data;
 242
 243 #ifdef __APPLE__
 244 /* New with DLIL */
 245         int     refcnt;
 246         int     offercnt;
 247         int     (*if_output)(struct ifnet *ifnet_ptr, struct mbuf *m);
 248         int     (*if_ioctl)(struct ifnet *ifnet_ptr, u_long  ioctl_code, void  *ioctl_arg);
 249         int     (*if_set_bpf_tap)(struct ifnet *ifp, int mode,
 250                                   int (*bpf_callback)(struct ifnet *, struct mbuf *));
 251         int     (*if_free)(struct ifnet *ifnet_ptr);
 252         int     (*if_demux)(struct ifnet  *ifnet_ptr, struct mbuf  *mbuf_ptr,
 253                             char *frame_ptr, void  *if_proto_ptr);
 254
 255         int     (*if_event)(struct ifnet  *ifnet_ptr, caddr_t  event_ptr);
 256
 257         int     (*if_framer)(struct ifnet    *ifp,
 258                              struct mbuf     **m,
 259                              struct sockaddr *dest,
 260                              char            *dest_linkaddr,
 261                              char            *frame_type);
 262
 263         u_long  if_family;              /* ulong assigned by Apple */
 264         struct tailq_head   if_flt_head;
 265
 266 /* End DLIL specific */
 267
 268         void    *reserved0;     /* for future use */
 269         void    *if_private;    /* private to interface */
 270         long    if_eflags;              /* autoaddr, autoaddr done, etc. */
 271 #endif /* __APPLE__ */
 272
 273         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 274         int     if_amcount;             /* number of all-multicast requests */
 275 /* procedure handles */
 276 #ifndef __APPLE__
 277         int     (*if_output)            /* output routine (enqueue) */
 278                 __P((struct ifnet *, struct mbuf *, struct sockaddr *,
 279                      struct rtentry *));
 280         void    (*if_start)             /* initiate output routine */
 281                 __P((struct ifnet *));
 282         int     (*if_done)              /* output complete routine */
 283                 __P((struct ifnet *));  /* (XXX not used; fake prototype) */
 284         int     (*if_ioctl)             /* ioctl routine */
 285                 __P((struct ifnet *, u_long, caddr_t));
 286         void    (*if_watchdog)          /* timer routine */
 287                 __P((struct ifnet *));
 288 #endif
 289         int     (*if_poll_recv)         /* polled receive routine */
 290                 __P((struct ifnet *, int *));
 291         int     (*if_poll_xmit)         /* polled transmit routine */
 292                 __P((struct ifnet *, int *));
 293         void    (*if_poll_intren)       /* polled interrupt reenable routine */
 294                 __P((struct ifnet *));
 295         void    (*if_poll_slowinput)    /* input routine for slow devices */
 296                 __P((struct ifnet *, struct mbuf *));
 297         void    (*if_init)              /* Init routine */
 298                 __P((void *));
 299         int     (*if_resolvemulti)      /* validate/resolve multicast */
 300                 __P((struct ifnet *, struct sockaddr **, struct sockaddr *));
 301         struct  ifqueue if_snd;         /* output queue */
 302         struct  ifqueue *if_poll_slowq; /* input queue for slow devices */
 303 #ifdef __APPLE__
 304         u_long  family_cookie;
 305         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 306         void *reserved1;        /* for future use */
 307 #else
 308         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 309 #endif /* __APPLE__ */
 310 };
 311 typedef void if_init_f_t __P((void *));
 312
 313 #define if_mtu          if_data.ifi_mtu
 314 #define if_type         if_data.ifi_type
 315 #define if_typelen      if_data.ifi_typelen
 316 #define if_physical     if_data.ifi_physical
 317 #define if_addrlen      if_data.ifi_addrlen
 318 #define if_hdrlen       if_data.ifi_hdrlen
 319 #define if_metric       if_data.ifi_metric
 320 #define if_baudrate     if_data.ifi_baudrate
 321 #define if_hwassist     if_data.ifi_hwassist
 322 #define if_ipackets     if_data.ifi_ipackets
 323 #define if_ierrors      if_data.ifi_ierrors
 324 #define if_opackets     if_data.ifi_opackets
 325 #define if_oerrors      if_data.ifi_oerrors
 326 #define if_collisions   if_data.ifi_collisions
 327 #define if_ibytes       if_data.ifi_ibytes
 328 #define if_obytes       if_data.ifi_obytes
 329 #define if_imcasts      if_data.ifi_imcasts
 330 #define if_omcasts      if_data.ifi_omcasts
 331 #define if_iqdrops      if_data.ifi_iqdrops
 332 #define if_noproto      if_data.ifi_noproto
 333 #define if_lastchange   if_data.ifi_lastchange
 334 #define if_recvquota    if_data.ifi_recvquota
 335 #define if_xmitquota    if_data.ifi_xmitquota
 336 #ifdef KERNEL_PRIVATE
 337 #define if_nvlans       if_data.ifi_nvlans
 338 #endif KERNEL_PRIVATE
 339 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
 340
 341 #ifndef __APPLE__
 342 /* for compatibility with other BSDs */
 343 #define if_addrlist     if_addrhead
 344 #define if_list         if_link
 345 #endif
 346 #ifdef KERNEL_PRIVATE
 347 /*
 348  * Structure describing a `cloning' interface.
 349  */
 350 struct if_clone {
 351         LIST_ENTRY(if_clone) ifc_list;  /* on list of cloners */
 352         const char *ifc_name;           /* name of device, e.g. `vlan' */
 353         size_t ifc_namelen;             /* length of name */
 354         int ifc_minifs;                 /* minimum number of interfaces */
 355         int ifc_maxunit;                /* maximum unit number */
 356         unsigned char *ifc_units;       /* bitmap to handle units */
 357         int ifc_bmlen;                  /* bitmap length */
 358
 359         int     (*ifc_create)(struct if_clone *, int);
 360         void    (*ifc_destroy)(struct ifnet *);
 361 };
 362
 363 #define IF_CLONE_INITIALIZER(name, create, destroy, minifs, maxunit)    \
 364     { { 0 }, name, sizeof(name) - 1, minifs, maxunit, NULL, 0, create, destroy }
 365 #endif
 366
 367 /*
 368  * Bit values in if_ipending
 369  */
 370 #define IFI_RECV        1       /* I want to receive */
 371 #define IFI_XMIT        2       /* I want to transmit */
 372
 373 /*
 374  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 375  * are queues of messages stored on ifqueue structures
 376  * (defined above).  Entries are added to and deleted from these structures
 377  * by these macros, which should be called with ipl raised to splimp().
 378  */
 379 #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 380 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 381 #define IF_ENQUEUE(ifq, m) { \
 382         (m)->m_nextpkt = 0; \
 383         if ((ifq)->ifq_tail == 0) \
 384                 (ifq)->ifq_head = m; \
 385         else \
 386                 (ifq)->ifq_tail->m_nextpkt = m; \
 387         (ifq)->ifq_tail = m; \
 388         (ifq)->ifq_len++; \
 389 }
 390 #define IF_PREPEND(ifq, m) { \
 391         (m)->m_nextpkt = (ifq)->ifq_head; \
 392         if ((ifq)->ifq_tail == 0) \
 393                 (ifq)->ifq_tail = (m); \
 394         (ifq)->ifq_head = (m); \
 395         (ifq)->ifq_len++; \
 396 }
 397 #define IF_DEQUEUE(ifq, m) { \
 398         (m) = (ifq)->ifq_head; \
 399         if (m) { \
 400                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
 401                         (ifq)->ifq_tail = 0; \
 402                 (m)->m_nextpkt = 0; \
 403                 (ifq)->ifq_len--; \
 404         } \
 405 }
 406
 407 #ifdef KERNEL
 408 #define IF_ENQ_DROP(ifq, m)     if_enq_drop(ifq, m)
 409
 410 #if defined(__GNUC__) && defined(MT_HEADER)
 411 static __inline int
 412 if_queue_drop(struct ifqueue *ifq, struct mbuf *m)
 413 {
 414         IF_DROP(ifq);
 415         return 0;
 416 }
 417
 418 static __inline int
 419 if_enq_drop(struct ifqueue *ifq, struct mbuf *m)
 420 {
 421         if (IF_QFULL(ifq) &&
 422             !if_queue_drop(ifq, m))
 423                 return 0;
 424         IF_ENQUEUE(ifq, m);
 425         return 1;
 426 }
 427 #else
 428
 429 #ifdef MT_HEADER
 430 int     if_enq_drop __P((struct ifqueue *, struct mbuf *));
 431 #endif
 432
 433 #endif
 434 #endif /* __APPLE_API_UNSTABLE */
 435
 436 /*
 437  * 72 was chosen below because it is the size of a TCP/IP
 438  * header (40) + the minimum mss (32).
 439  */
 440 #define IF_MINMTU       72
 441 #define IF_MAXMTU       65535
 442
 443 #endif /* KERNEL */
 444
 445 #ifdef __APPLE_API_UNSTABLE
 446 /*
 447  * The ifaddr structure contains information about one address
 448  * of an interface.  They are maintained by the different address families,
 449  * are allocated and attached when an address is set, and are linked
 450  * together so all addresses for an interface can be located.
 451  */
 452 struct ifaddr {
 453         struct  sockaddr *ifa_addr;     /* address of interface */
 454         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 455 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 456         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 457 #ifndef __APPLE__
 458         /* Use of if_data doesn't justify change of API */
 459         struct  if_data if_data;        /* not all members are meaningful */
 460 #endif
 461         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 462         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
 463         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 464                 __P((int, struct rtentry *, struct sockaddr *));
 465         u_short ifa_flags;              /* mostly rt_flags for cloning */
 466         short   ifa_refcnt;/* 16bit ref count, use ifaref, ifafree */
 467         int     ifa_metric;             /* cost of going out this interface */
 468 #ifdef notdef
 469         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 470 #endif
 471         u_long  ifa_dlt;
 472         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 473                 __P((struct ifaddr *, struct sockaddr *));
 474 };
 475 #define IFA_ROUTE       RTF_UP          /* route installed */
 476
 477 /*
 478  * The prefix structure contains information about one prefix
 479  * of an interface.  They are maintained by the different address families,
 480  * are allocated and attached when an prefix or an address is set,
 481  * and are linked together so all prefixes for an interface can be located.
 482  */
 483 struct ifprefix {
 484         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 485         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 486         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 487         u_char  ifpr_plen;              /* prefix length in bits */
 488         u_char  ifpr_type;              /* protocol dependent prefix type */
 489 };
 490
 491 /*
 492  * Multicast address structure.  This is analogous to the ifaddr
 493  * structure except that it keeps track of multicast addresses.
 494  * Also, the reference count here is a count of requests for this
 495  * address, not a count of pointers to this structure.
 496  */
 497 struct ifmultiaddr {
 498         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 499         struct  sockaddr *ifma_addr;    /* address this membership is for */
 500         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 501         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 502         u_int   ifma_refcount;          /* reference count */
 503         void    *ifma_protospec;        /* protocol-specific state, if any */
 504 };
 505
 506 #ifdef KERNEL
 507 #define IFAREF(ifa) ifaref(ifa)
 508 #define IFAFREE(ifa) ifafree(ifa)
 509
 510 #ifdef __APPLE_API_PRIVATE
 511 extern  struct ifnethead ifnet;
 512 extern struct   ifnet   **ifindex2ifnet;
 513 extern  int ifqmaxlen;
 514 extern  struct ifnet loif[];
 515 extern  int if_index;
 516 extern  struct ifaddr **ifnet_addrs;
 517 #endif /* __APPLE_API_PRIVATE */
 518
 519 #ifndef __APPLE__
 520 void    ether_ifattach __P((struct ifnet *, int));
 521 void    ether_ifdetach __P((struct ifnet *, int));
 522 void    ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *));
 523 void    ether_demux __P((struct ifnet *, struct ether_header *, struct mbuf *));
 524 int     ether_output __P((struct ifnet *,
 525            struct mbuf *, struct sockaddr *, struct rtentry *));
 526 int     ether_output_frame __P((struct ifnet *, struct mbuf *));
 527 int     ether_ioctl __P((struct ifnet *, int, caddr_t));
 528 #endif
 529
 530 int     if_addmulti __P((struct ifnet *, struct sockaddr *,
 531                          struct ifmultiaddr **));
 532 int     if_allmulti __P((struct ifnet *, int));
 533 void    if_attach __P((struct ifnet *));
 534 int     if_delmultiaddr __P((struct ifmultiaddr *ifma));
 535 int     if_delmulti __P((struct ifnet *, struct sockaddr *));
 536 void    if_down __P((struct ifnet *));
 537 void    if_route __P((struct ifnet *, int flag, int fam));
 538 void    if_unroute __P((struct ifnet *, int flag, int fam));
 539 void    if_up __P((struct ifnet *));
 540 /*void  ifinit __P((void));*/ /* declared in systm.h for main() */
 541 int     ifioctl __P((struct socket *, u_long, caddr_t, struct proc *));
 542 int     ifpromisc __P((struct ifnet *, int));
 543 struct  ifnet *ifunit __P((const char *));
 544 struct  ifnet *if_withname __P((struct sockaddr *));
 545
 546 int     if_poll_recv_slow __P((struct ifnet *ifp, int *quotap));
 547 void    if_poll_xmit_slow __P((struct ifnet *ifp, int *quotap));
 548 void    if_poll_throttle __P((void));
 549 void    if_poll_unthrottle __P((void *));
 550 void    if_poll_init __P((void));
 551 void    if_poll __P((void));
 552 #ifdef KERNEL_PRIVATE
 553 void    if_clone_attach(struct if_clone *);
 554 void    if_clone_detach(struct if_clone *);
 555 #endif KERNEL_PRIVATE
 556
 557 struct  ifaddr *ifa_ifwithaddr __P((struct sockaddr *));
 558 struct  ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *));
 559 struct  ifaddr *ifa_ifwithnet __P((struct sockaddr *));
 560 struct  ifaddr *ifa_ifwithroute __P((int, struct sockaddr *,
 561                                         struct sockaddr *));
 562 struct  ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *));
 563 void    ifafree __P((struct ifaddr *));
 564 void    ifaref __P((struct ifaddr *));
 565
 566 struct  ifmultiaddr *ifmaof_ifpforaddr __P((struct sockaddr *,
 567                                             struct ifnet *));
 568 #ifndef __APPLE__
 569 int     if_simloop __P((struct ifnet *ifp, struct mbuf *m,
 570                 struct sockaddr *dst, int hlen));
 571 #endif
 572
 573 #endif /* KERNEL */
 574
 575
 576 #endif /* __APPLE_API_UNSTABLE */
 577 #endif /* !_NET_IF_VAR_H_ */