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 #endif
  76
  77 /*
  78  * Structures defining a network interface, providing a packet
  79  * transport mechanism (ala level 0 of the PUP protocols).
  80  *
  81  * Each interface accepts output datagrams of a specified maximum
  82  * length, and provides higher level routines with input datagrams
  83  * received from its medium.
  84  *
  85  * Output occurs when the routine if_output is called, with three parameters:
  86  *      (*ifp->if_output)(ifp, m, dst, rt)
  87  * Here m is the mbuf chain to be sent and dst is the destination address.
  88  * The output routine encapsulates the supplied datagram if necessary,
  89  * and then transmits it on its medium.
  90  *
  91  * On input, each interface unwraps the data received by it, and either
  92  * places it on the input queue of a internetwork datagram routine
  93  * and posts the associated software interrupt, or passes the datagram to a raw
  94  * packet input routine.
  95  *
  96  * Routines exist for locating interfaces by their addresses
  97  * or for locating a interface on a certain network, as well as more general
  98  * routing and gateway routines maintaining information used to locate
  99  * interfaces.  These routines live in the files if.c and route.c
 100  */
 101
 102 #ifdef __STDC__
 103 /*
 104  * Forward structure declarations for function prototypes [sic].
 105  */
 106 struct  mbuf;
 107 struct  proc;
 108 struct  rtentry;
 109 struct  socket;
 110 struct  ether_header;
 111 struct  sockaddr_dl;
 112 #endif
 113
 114 #define IFNAMSIZ        16
 115
 116 #include <sys/queue.h>          /* get TAILQ macros */
 117
 118 #ifdef __APPLE_API_UNSTABLE
 119 #ifdef __APPLE__
 120 struct tqdummy;
 121
 122 TAILQ_HEAD(tailq_head, tqdummy);
 123
 124 /* This belongs up in socket.h or socketvar.h, depending on how far the
 125  *   event bubbles up.
 126  */
 127
 128 struct net_event_data {
 129      u_long             if_family;
 130      u_long             if_unit;
 131      char               if_name[IFNAMSIZ];
 132 };
 133 #endif
 134
 135
 136 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 137 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
 138 TAILQ_HEAD(ifprefixhead, ifprefix);
 139 LIST_HEAD(ifmultihead, ifmultiaddr);
 140
 141 #ifdef __APPLE__
 142 /*
 143  * Structure describing information about an interface
 144  * which may be of interest to management entities.
 145  */
 146 struct if_data {
 147         /* generic interface information */
 148         u_char  ifi_type;               /* ethernet, tokenring, etc */
 149 #ifdef __APPLE__
 150         u_char  ifi_typelen;            /* Length of frame type id */
 151 #endif
 152         u_char  ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */
 153         u_char  ifi_addrlen;            /* media address length */
 154         u_char  ifi_hdrlen;             /* media header length */
 155         u_char  ifi_recvquota;          /* polling quota for receive intrs */
 156         u_char  ifi_xmitquota;          /* polling quota for xmit intrs */
 157         u_long  ifi_mtu;                /* maximum transmission unit */
 158         u_long  ifi_metric;             /* routing metric (external only) */
 159         u_long  ifi_baudrate;           /* linespeed */
 160         /* volatile statistics */
 161         u_long  ifi_ipackets;           /* packets received on interface */
 162         u_long  ifi_ierrors;            /* input errors on interface */
 163         u_long  ifi_opackets;           /* packets sent on interface */
 164         u_long  ifi_oerrors;            /* output errors on interface */
 165         u_long  ifi_collisions;         /* collisions on csma interfaces */
 166         u_long  ifi_ibytes;             /* total number of octets received */
 167         u_long  ifi_obytes;             /* total number of octets sent */
 168         u_long  ifi_imcasts;            /* packets received via multicast */
 169         u_long  ifi_omcasts;            /* packets sent via multicast */
 170         u_long  ifi_iqdrops;            /* dropped on input, this interface */
 171         u_long  ifi_noproto;            /* destined for unsupported protocol */
 172 #ifdef __APPLE__
 173         u_long  ifi_recvtiming;         /* usec spent receiving when timing */
 174         u_long  ifi_xmittiming;         /* usec spent xmitting when timing */
 175 #endif
 176         struct  timeval ifi_lastchange; /* time of last administrative change */
 177 #ifdef __APPLE__
 178         u_long  default_proto;          /* Default dl_tag when none is specified
 179                                                                  * on dlil_output */
 180 #endif
 181         u_long  ifi_hwassist;           /* HW offload capabilities */
 182         u_long  ifi_reserved1;          /* for future use */
 183         u_long  ifi_reserved2;          /* for future use */
 184 };
 185 #endif
 186
 187 /*
 188  * Structure defining a queue for a network interface.
 189  */
 190 struct  ifqueue {
 191         struct  mbuf *ifq_head;
 192         struct  mbuf *ifq_tail;
 193         int     ifq_len;
 194         int     ifq_maxlen;
 195         int     ifq_drops;
 196 };
 197
 198 /*
 199  * Structure defining a network interface.
 200  *
 201  * (Would like to call this struct ``if'', but C isn't PL/1.)
 202  */
 203 struct ifnet {
 204         void    *if_softc;              /* pointer to driver state */
 205         char    *if_name;               /* name, e.g. ``en'' or ``lo'' */
 206         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 207         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
 208 #ifdef __APPLE__
 209         struct  tailq_head proto_head;  /* Head for if_proto structures */
 210 #endif
 211         int     if_pcount;              /* number of promiscuous listeners */
 212         struct  bpf_if *if_bpf;         /* packet filter structure */
 213         u_short if_index;               /* numeric abbreviation for this if  */
 214         short   if_unit;                /* sub-unit for lower level driver */
 215         short   if_timer;               /* time 'til if_watchdog called */
 216         short   if_flags;               /* up/down, broadcast, etc. */
 217         int     if_ipending;            /* interrupts pending */
 218         void    *if_linkmib;            /* link-type-specific MIB data */
 219         size_t  if_linkmiblen;          /* length of above data */
 220         struct  if_data if_data;
 221
 222 #ifdef __APPLE__
 223 /* New with DLIL */
 224         int     refcnt;
 225         int     offercnt;
 226         int     (*if_output)(struct ifnet *ifnet_ptr, struct mbuf *m);
 227         int     (*if_ioctl)(struct ifnet *ifnet_ptr, u_long  ioctl_code, void  *ioctl_arg);
 228         int     (*if_set_bpf_tap)(struct ifnet *ifp, int mode,
 229                                   int (*bpf_callback)(struct ifnet *, struct mbuf *));
 230         int     (*if_free)(struct ifnet *ifnet_ptr);
 231         int     (*if_demux)(struct ifnet  *ifnet_ptr, struct mbuf  *mbuf_ptr,
 232                             char *frame_ptr, void  *if_proto_ptr);
 233
 234         int     (*if_event)(struct ifnet  *ifnet_ptr, caddr_t  event_ptr);
 235
 236         int     (*if_framer)(struct ifnet    *ifp,
 237                              struct mbuf     **m,
 238                              struct sockaddr *dest,
 239                              char            *dest_linkaddr,
 240                              char            *frame_type);
 241
 242         u_long  if_family;              /* ulong assigned by Apple */
 243         struct tailq_head   if_flt_head;
 244
 245 /* End DLIL specific */
 246
 247         void    *reserved0;     /* for future use */
 248         void    *if_private;    /* private to interface */
 249         long    if_eflags;              /* autoaddr, autoaddr done, etc. */
 250 #endif /* __APPLE__ */
 251
 252         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 253         int     if_amcount;             /* number of all-multicast requests */
 254 /* procedure handles */
 255 #ifndef __APPLE__
 256         int     (*if_output)            /* output routine (enqueue) */
 257                 __P((struct ifnet *, struct mbuf *, struct sockaddr *,
 258                      struct rtentry *));
 259         void    (*if_start)             /* initiate output routine */
 260                 __P((struct ifnet *));
 261         int     (*if_done)              /* output complete routine */
 262                 __P((struct ifnet *));  /* (XXX not used; fake prototype) */
 263         int     (*if_ioctl)             /* ioctl routine */
 264                 __P((struct ifnet *, u_long, caddr_t));
 265         void    (*if_watchdog)          /* timer routine */
 266                 __P((struct ifnet *));
 267 #endif
 268         int     (*if_poll_recv)         /* polled receive routine */
 269                 __P((struct ifnet *, int *));
 270         int     (*if_poll_xmit)         /* polled transmit routine */
 271                 __P((struct ifnet *, int *));
 272         void    (*if_poll_intren)       /* polled interrupt reenable routine */
 273                 __P((struct ifnet *));
 274         void    (*if_poll_slowinput)    /* input routine for slow devices */
 275                 __P((struct ifnet *, struct mbuf *));
 276         void    (*if_init)              /* Init routine */
 277                 __P((void *));
 278         int     (*if_resolvemulti)      /* validate/resolve multicast */
 279                 __P((struct ifnet *, struct sockaddr **, struct sockaddr *));
 280         struct  ifqueue if_snd;         /* output queue */
 281         struct  ifqueue *if_poll_slowq; /* input queue for slow devices */
 282 #ifdef __APPLE__
 283         u_long  family_cookie;
 284         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 285         void *reserved1;        /* for future use */
 286 #else
 287         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 288 #endif /* __APPLE__ */
 289 };
 290 typedef void if_init_f_t __P((void *));
 291
 292 #define if_mtu          if_data.ifi_mtu
 293 #define if_type         if_data.ifi_type
 294 #define if_typelen      if_data.ifi_typelen
 295 #define if_physical     if_data.ifi_physical
 296 #define if_addrlen      if_data.ifi_addrlen
 297 #define if_hdrlen       if_data.ifi_hdrlen
 298 #define if_metric       if_data.ifi_metric
 299 #define if_baudrate     if_data.ifi_baudrate
 300 #define if_hwassist     if_data.ifi_hwassist
 301 #define if_ipackets     if_data.ifi_ipackets
 302 #define if_ierrors      if_data.ifi_ierrors
 303 #define if_opackets     if_data.ifi_opackets
 304 #define if_oerrors      if_data.ifi_oerrors
 305 #define if_collisions   if_data.ifi_collisions
 306 #define if_ibytes       if_data.ifi_ibytes
 307 #define if_obytes       if_data.ifi_obytes
 308 #define if_imcasts      if_data.ifi_imcasts
 309 #define if_omcasts      if_data.ifi_omcasts
 310 #define if_iqdrops      if_data.ifi_iqdrops
 311 #define if_noproto      if_data.ifi_noproto
 312 #define if_lastchange   if_data.ifi_lastchange
 313 #define if_recvquota    if_data.ifi_recvquota
 314 #define if_xmitquota    if_data.ifi_xmitquota
 315 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
 316
 317 #ifndef __APPLE__
 318 /* for compatibility with other BSDs */
 319 #define if_addrlist     if_addrhead
 320 #define if_list         if_link
 321 #endif
 322
 323 /*
 324  * Bit values in if_ipending
 325  */
 326 #define IFI_RECV        1       /* I want to receive */
 327 #define IFI_XMIT        2       /* I want to transmit */
 328
 329 /*
 330  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 331  * are queues of messages stored on ifqueue structures
 332  * (defined above).  Entries are added to and deleted from these structures
 333  * by these macros, which should be called with ipl raised to splimp().
 334  */
 335 #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 336 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 337 #define IF_ENQUEUE(ifq, m) { \
 338         (m)->m_nextpkt = 0; \
 339         if ((ifq)->ifq_tail == 0) \
 340                 (ifq)->ifq_head = m; \
 341         else \
 342                 (ifq)->ifq_tail->m_nextpkt = m; \
 343         (ifq)->ifq_tail = m; \
 344         (ifq)->ifq_len++; \
 345 }
 346 #define IF_PREPEND(ifq, m) { \
 347         (m)->m_nextpkt = (ifq)->ifq_head; \
 348         if ((ifq)->ifq_tail == 0) \
 349                 (ifq)->ifq_tail = (m); \
 350         (ifq)->ifq_head = (m); \
 351         (ifq)->ifq_len++; \
 352 }
 353 #define IF_DEQUEUE(ifq, m) { \
 354         (m) = (ifq)->ifq_head; \
 355         if (m) { \
 356                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
 357                         (ifq)->ifq_tail = 0; \
 358                 (m)->m_nextpkt = 0; \
 359                 (ifq)->ifq_len--; \
 360         } \
 361 }
 362
 363 #ifdef KERNEL
 364 #define IF_ENQ_DROP(ifq, m)     if_enq_drop(ifq, m)
 365
 366 #if defined(__GNUC__) && defined(MT_HEADER)
 367 static __inline int
 368 if_queue_drop(struct ifqueue *ifq, struct mbuf *m)
 369 {
 370         IF_DROP(ifq);
 371         return 0;
 372 }
 373
 374 static __inline int
 375 if_enq_drop(struct ifqueue *ifq, struct mbuf *m)
 376 {
 377         if (IF_QFULL(ifq) &&
 378             !if_queue_drop(ifq, m))
 379                 return 0;
 380         IF_ENQUEUE(ifq, m);
 381         return 1;
 382 }
 383 #else
 384
 385 #ifdef MT_HEADER
 386 int     if_enq_drop __P((struct ifqueue *, struct mbuf *));
 387 #endif
 388
 389 #endif
 390 #endif /* __APPLE_API_UNSTABLE */
 391
 392 /*
 393  * 72 was chosen below because it is the size of a TCP/IP
 394  * header (40) + the minimum mss (32).
 395  */
 396 #define IF_MINMTU       72
 397 #define IF_MAXMTU       65535
 398
 399 #endif /* KERNEL */
 400
 401 #ifdef __APPLE_API_UNSTABLE
 402 /*
 403  * The ifaddr structure contains information about one address
 404  * of an interface.  They are maintained by the different address families,
 405  * are allocated and attached when an address is set, and are linked
 406  * together so all addresses for an interface can be located.
 407  */
 408 struct ifaddr {
 409         struct  sockaddr *ifa_addr;     /* address of interface */
 410         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 411 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 412         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 413 #ifndef __APPLE__
 414         /* Use of if_data doesn't justify change of API */
 415         struct  if_data if_data;        /* not all members are meaningful */
 416 #endif
 417         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 418         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
 419         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 420                 __P((int, struct rtentry *, struct sockaddr *));
 421         u_short ifa_flags;              /* mostly rt_flags for cloning */
 422         short   ifa_refcnt;/* 16bit ref count, use ifaref, ifafree */
 423         int     ifa_metric;             /* cost of going out this interface */
 424 #ifdef notdef
 425         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 426 #endif
 427         u_long  ifa_dlt;
 428         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 429                 __P((struct ifaddr *, struct sockaddr *));
 430 };
 431 #define IFA_ROUTE       RTF_UP          /* route installed */
 432
 433 /*
 434  * The prefix structure contains information about one prefix
 435  * of an interface.  They are maintained by the different address families,
 436  * are allocated and attached when an prefix or an address is set,
 437  * and are linked together so all prefixes for an interface can be located.
 438  */
 439 struct ifprefix {
 440         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 441         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 442         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 443         u_char  ifpr_plen;              /* prefix length in bits */
 444         u_char  ifpr_type;              /* protocol dependent prefix type */
 445 };
 446
 447 /*
 448  * Multicast address structure.  This is analogous to the ifaddr
 449  * structure except that it keeps track of multicast addresses.
 450  * Also, the reference count here is a count of requests for this
 451  * address, not a count of pointers to this structure.
 452  */
 453 struct ifmultiaddr {
 454         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 455         struct  sockaddr *ifma_addr;    /* address this membership is for */
 456         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 457         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 458         u_int   ifma_refcount;          /* reference count */
 459         void    *ifma_protospec;        /* protocol-specific state, if any */
 460 };
 461
 462 #ifdef KERNEL
 463 #define IFAREF(ifa) ifaref(ifa)
 464 #define IFAFREE(ifa) ifafree(ifa)
 465
 466 #ifdef __APPLE_API_PRIVATE
 467 extern  struct ifnethead ifnet;
 468 extern struct   ifnet   **ifindex2ifnet;
 469 extern  int ifqmaxlen;
 470 extern  struct ifnet loif[];
 471 extern  int if_index;
 472 extern  struct ifaddr **ifnet_addrs;
 473 #endif /* __APPLE_API_PRIVATE */
 474
 475 #ifndef __APPLE__
 476 void    ether_ifattach __P((struct ifnet *, int));
 477 void    ether_ifdetach __P((struct ifnet *, int));
 478 void    ether_input __P((struct ifnet *, struct ether_header *, struct mbuf *));
 479 void    ether_demux __P((struct ifnet *, struct ether_header *, struct mbuf *));
 480 int     ether_output __P((struct ifnet *,
 481            struct mbuf *, struct sockaddr *, struct rtentry *));
 482 int     ether_output_frame __P((struct ifnet *, struct mbuf *));
 483 int     ether_ioctl __P((struct ifnet *, int, caddr_t));
 484 #endif
 485
 486 int     if_addmulti __P((struct ifnet *, struct sockaddr *,
 487                          struct ifmultiaddr **));
 488 int     if_allmulti __P((struct ifnet *, int));
 489 void    if_attach __P((struct ifnet *));
 490 int     if_delmulti __P((struct ifnet *, struct sockaddr *));
 491 void    if_down __P((struct ifnet *));
 492 void    if_route __P((struct ifnet *, int flag, int fam));
 493 void    if_unroute __P((struct ifnet *, int flag, int fam));
 494 void    if_up __P((struct ifnet *));
 495 /*void  ifinit __P((void));*/ /* declared in systm.h for main() */
 496 int     ifioctl __P((struct socket *, u_long, caddr_t, struct proc *));
 497 int     ifpromisc __P((struct ifnet *, int));
 498 struct  ifnet *ifunit __P((const char *));
 499 struct  ifnet *if_withname __P((struct sockaddr *));
 500
 501 int     if_poll_recv_slow __P((struct ifnet *ifp, int *quotap));
 502 void    if_poll_xmit_slow __P((struct ifnet *ifp, int *quotap));
 503 void    if_poll_throttle __P((void));
 504 void    if_poll_unthrottle __P((void *));
 505 void    if_poll_init __P((void));
 506 void    if_poll __P((void));
 507
 508 struct  ifaddr *ifa_ifwithaddr __P((struct sockaddr *));
 509 struct  ifaddr *ifa_ifwithdstaddr __P((struct sockaddr *));
 510 struct  ifaddr *ifa_ifwithnet __P((struct sockaddr *));
 511 struct  ifaddr *ifa_ifwithroute __P((int, struct sockaddr *,
 512                                         struct sockaddr *));
 513 struct  ifaddr *ifaof_ifpforaddr __P((struct sockaddr *, struct ifnet *));
 514 void    ifafree __P((struct ifaddr *));
 515 void    ifaref __P((struct ifaddr *));
 516
 517 struct  ifmultiaddr *ifmaof_ifpforaddr __P((struct sockaddr *,
 518                                             struct ifnet *));
 519 #ifndef __APPLE__
 520 int     if_simloop __P((struct ifnet *ifp, struct mbuf *m,
 521                 struct sockaddr *dst, int hlen));
 522 #endif
 523
 524 #endif /* KERNEL */
 525
 526
 527 #endif /* __APPLE_API_UNSTABLE */
 528 #endif /* !_NET_IF_VAR_H_ */