bsd/net/if_var.h

   1 /*
   2  * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1982, 1986, 1989, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
  61  * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.7 2001/07/24 19:10:18 brooks Exp $
  62  */
  63
  64 #ifndef _NET_IF_VAR_H_
  65 #define _NET_IF_VAR_H_
  66
  67 #include <sys/appleapiopts.h>
  68 #include <sys/types.h>
  69 #include <sys/time.h>
  70 #include <sys/queue.h>          /* get TAILQ macros */
  71 #ifdef KERNEL_PRIVATE
  72 #include <kern/locks.h>
  73 #endif /* KERNEL_PRIVATE */
  74
  75 #ifdef KERNEL
  76 #include <net/kpi_interface.h>
  77 #endif KERNEL
  78
  79 #ifdef __APPLE__
  80 #define APPLE_IF_FAM_LOOPBACK  1
  81 #define APPLE_IF_FAM_ETHERNET  2
  82 #define APPLE_IF_FAM_SLIP      3
  83 #define APPLE_IF_FAM_TUN       4
  84 #define APPLE_IF_FAM_VLAN      5
  85 #define APPLE_IF_FAM_PPP       6
  86 #define APPLE_IF_FAM_PVC       7
  87 #define APPLE_IF_FAM_DISC      8
  88 #define APPLE_IF_FAM_MDECAP    9
  89 #define APPLE_IF_FAM_GIF       10
  90 #define APPLE_IF_FAM_FAITH     11
  91 #define APPLE_IF_FAM_STF       12
  92 #define APPLE_IF_FAM_FIREWIRE  13
  93 #define APPLE_IF_FAM_BOND      14
  94 #endif /* __APPLE__ */
  95
  96 /*
  97  * 72 was chosen below because it is the size of a TCP/IP
  98  * header (40) + the minimum mss (32).
  99  */
 100 #define IF_MINMTU       72
 101 #define IF_MAXMTU       65535
 102
 103 /*
 104  * Structures defining a network interface, providing a packet
 105  * transport mechanism (ala level 0 of the PUP protocols).
 106  *
 107  * Each interface accepts output datagrams of a specified maximum
 108  * length, and provides higher level routines with input datagrams
 109  * received from its medium.
 110  *
 111  * Output occurs when the routine if_output is called, with three parameters:
 112  *      (*ifp->if_output)(ifp, m, dst, rt)
 113  * Here m is the mbuf chain to be sent and dst is the destination address.
 114  * The output routine encapsulates the supplied datagram if necessary,
 115  * and then transmits it on its medium.
 116  *
 117  * On input, each interface unwraps the data received by it, and either
 118  * places it on the input queue of a internetwork datagram routine
 119  * and posts the associated software interrupt, or passes the datagram to a raw
 120  * packet input routine.
 121  *
 122  * Routines exist for locating interfaces by their addresses
 123  * or for locating a interface on a certain network, as well as more general
 124  * routing and gateway routines maintaining information used to locate
 125  * interfaces.  These routines live in the files if.c and route.c
 126  */
 127
 128 #define IFNAMSIZ        16
 129
 130 /* This belongs up in socket.h or socketvar.h, depending on how far the
 131  *   event bubbles up.
 132  */
 133
 134 struct net_event_data {
 135         u_int32_t       if_family;
 136         u_int32_t       if_unit;
 137         char            if_name[IFNAMSIZ];
 138 };
 139
 140 #if defined(__LP64__)
 141 #define __need_struct_timeval32
 142 #include <sys/_structs.h>
 143 #define IF_DATA_TIMEVAL timeval32
 144 #else
 145 #define IF_DATA_TIMEVAL timeval
 146 #endif
 147
 148 #pragma pack(4)
 149
 150 /*
 151  * Structure describing information about an interface
 152  * which may be of interest to management entities.
 153  */
 154 struct if_data {
 155         /* generic interface information */
 156         u_char          ifi_type;       /* ethernet, tokenring, etc */
 157         u_char          ifi_typelen;    /* Length of frame type id */
 158         u_char          ifi_physical;   /* e.g., AUI, Thinnet, 10base-T, etc */
 159         u_char          ifi_addrlen;    /* media address length */
 160         u_char          ifi_hdrlen;     /* media header length */
 161         u_char          ifi_recvquota;  /* polling quota for receive intrs */
 162         u_char          ifi_xmitquota;  /* polling quota for xmit intrs */
 163         u_char          ifi_unused1;    /* for future use */
 164         u_int32_t       ifi_mtu;        /* maximum transmission unit */
 165         u_int32_t       ifi_metric;     /* routing metric (external only) */
 166         u_int32_t       ifi_baudrate;   /* linespeed */
 167         /* volatile statistics */
 168         u_int32_t       ifi_ipackets;   /* packets received on interface */
 169         u_int32_t       ifi_ierrors;    /* input errors on interface */
 170         u_int32_t       ifi_opackets;   /* packets sent on interface */
 171         u_int32_t       ifi_oerrors;    /* output errors on interface */
 172         u_int32_t       ifi_collisions; /* collisions on csma interfaces */
 173         u_int32_t       ifi_ibytes;     /* total number of octets received */
 174         u_int32_t       ifi_obytes;     /* total number of octets sent */
 175         u_int32_t       ifi_imcasts;    /* packets received via multicast */
 176         u_int32_t       ifi_omcasts;    /* packets sent via multicast */
 177         u_int32_t       ifi_iqdrops;    /* dropped on input, this interface */
 178         u_int32_t       ifi_noproto;    /* destined for unsupported protocol */
 179         u_int32_t       ifi_recvtiming; /* usec spent receiving when timing */
 180         u_int32_t       ifi_xmittiming; /* usec spent xmitting when timing */
 181         struct IF_DATA_TIMEVAL ifi_lastchange;  /* time of last administrative change */
 182         u_int32_t       ifi_unused2;    /* used to be the default_proto */
 183         u_int32_t       ifi_hwassist;   /* HW offload capabilities */
 184         u_int32_t       ifi_reserved1;  /* for future use */
 185         u_int32_t       ifi_reserved2;  /* for future use */
 186 };
 187
 188 /*
 189  * Structure describing information about an interface
 190  * which may be of interest to management entities.
 191  */
 192 struct if_data64 {
 193         /* generic interface information */
 194         u_char          ifi_type;               /* ethernet, tokenring, etc */
 195         u_char          ifi_typelen;            /* Length of frame type id */
 196         u_char          ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */
 197         u_char          ifi_addrlen;            /* media address length */
 198         u_char          ifi_hdrlen;             /* media header length */
 199         u_char          ifi_recvquota;          /* polling quota for receive intrs */
 200         u_char          ifi_xmitquota;          /* polling quota for xmit intrs */
 201         u_char          ifi_unused1;            /* for future use */
 202         u_int32_t       ifi_mtu;                /* maximum transmission unit */
 203         u_int32_t       ifi_metric;             /* routing metric (external only) */
 204         u_int64_t       ifi_baudrate;           /* linespeed */
 205         /* volatile statistics */
 206         u_int64_t       ifi_ipackets;           /* packets received on interface */
 207         u_int64_t       ifi_ierrors;            /* input errors on interface */
 208         u_int64_t       ifi_opackets;           /* packets sent on interface */
 209         u_int64_t       ifi_oerrors;            /* output errors on interface */
 210         u_int64_t       ifi_collisions;         /* collisions on csma interfaces */
 211         u_int64_t       ifi_ibytes;             /* total number of octets received */
 212         u_int64_t       ifi_obytes;             /* total number of octets sent */
 213         u_int64_t       ifi_imcasts;            /* packets received via multicast */
 214         u_int64_t       ifi_omcasts;            /* packets sent via multicast */
 215         u_int64_t       ifi_iqdrops;            /* dropped on input, this interface */
 216         u_int64_t       ifi_noproto;            /* destined for unsupported protocol */
 217         u_int32_t       ifi_recvtiming;         /* usec spent receiving when timing */
 218         u_int32_t       ifi_xmittiming;         /* usec spent xmitting when timing */
 219         struct IF_DATA_TIMEVAL ifi_lastchange;  /* time of last administrative change */
 220 };
 221
 222 #pragma pack()
 223
 224 #ifdef PRIVATE
 225 /*
 226  * Internal storage of if_data. This is bound to change. Various places in the
 227  * stack will translate this data structure in to the externally visible
 228  * if_data structure above.
 229  */
 230 struct if_data_internal {
 231         /* generic interface information */
 232         u_char          ifi_type;       /* ethernet, tokenring, etc */
 233         u_char          ifi_typelen;    /* Length of frame type id */
 234         u_char          ifi_physical;   /* e.g., AUI, Thinnet, 10base-T, etc */
 235         u_char          ifi_addrlen;    /* media address length */
 236         u_char          ifi_hdrlen;     /* media header length */
 237         u_char          ifi_recvquota;  /* polling quota for receive intrs */
 238         u_char          ifi_xmitquota;  /* polling quota for xmit intrs */
 239         u_char          ifi_unused1;    /* for future use */
 240         u_int32_t       ifi_mtu;        /* maximum transmission unit */
 241         u_int32_t       ifi_metric;     /* routing metric (external only) */
 242         u_int32_t       ifi_baudrate;   /* linespeed */
 243         /* volatile statistics */
 244         u_int64_t       ifi_ipackets;   /* packets received on interface */
 245         u_int64_t       ifi_ierrors;    /* input errors on interface */
 246         u_int64_t       ifi_opackets;   /* packets sent on interface */
 247         u_int64_t       ifi_oerrors;    /* output errors on interface */
 248         u_int64_t       ifi_collisions; /* collisions on csma interfaces */
 249         u_int64_t       ifi_ibytes;     /* total number of octets received */
 250         u_int64_t       ifi_obytes;     /* total number of octets sent */
 251         u_int64_t       ifi_imcasts;    /* packets received via multicast */
 252         u_int64_t       ifi_omcasts;    /* packets sent via multicast */
 253         u_int64_t       ifi_iqdrops;    /* dropped on input, this interface */
 254         u_int64_t       ifi_noproto;    /* destined for unsupported protocol */
 255         u_int32_t       ifi_recvtiming; /* usec spent receiving when timing */
 256         u_int32_t       ifi_xmittiming; /* usec spent xmitting when timing */
 257 #define IF_LASTCHANGEUPTIME     1       /* lastchange: 1-uptime 0-calendar time */
 258         struct  timeval ifi_lastchange; /* time of last administrative change */
 259         u_int32_t       ifi_hwassist;   /* HW offload capabilities */
 260 };
 261
 262 #define if_mtu          if_data.ifi_mtu
 263 #define if_type         if_data.ifi_type
 264 #define if_typelen      if_data.ifi_typelen
 265 #define if_physical     if_data.ifi_physical
 266 #define if_addrlen      if_data.ifi_addrlen
 267 #define if_hdrlen       if_data.ifi_hdrlen
 268 #define if_metric       if_data.ifi_metric
 269 #define if_baudrate     if_data.ifi_baudrate
 270 #define if_hwassist     if_data.ifi_hwassist
 271 #define if_ipackets     if_data.ifi_ipackets
 272 #define if_ierrors      if_data.ifi_ierrors
 273 #define if_opackets     if_data.ifi_opackets
 274 #define if_oerrors      if_data.ifi_oerrors
 275 #define if_collisions   if_data.ifi_collisions
 276 #define if_ibytes       if_data.ifi_ibytes
 277 #define if_obytes       if_data.ifi_obytes
 278 #define if_imcasts      if_data.ifi_imcasts
 279 #define if_omcasts      if_data.ifi_omcasts
 280 #define if_iqdrops      if_data.ifi_iqdrops
 281 #define if_noproto      if_data.ifi_noproto
 282 #define if_lastchange   if_data.ifi_lastchange
 283 #define if_recvquota    if_data.ifi_recvquota
 284 #define if_xmitquota    if_data.ifi_xmitquota
 285 #define if_iflags       if_data.ifi_iflags
 286
 287 struct  mbuf;
 288 struct ifaddr;
 289 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 290 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
 291 TAILQ_HEAD(ifprefixhead, ifprefix);
 292 LIST_HEAD(ifmultihead, ifmultiaddr);
 293 struct tqdummy;
 294 TAILQ_HEAD(tailq_head, tqdummy);
 295
 296 /*
 297  * Forward structure declarations for function prototypes [sic].
 298  */
 299 struct  proc;
 300 struct  rtentry;
 301 struct  socket;
 302 struct  ether_header;
 303 struct  sockaddr_dl;
 304 struct ifnet_filter;
 305
 306 TAILQ_HEAD(ifnet_filter_head, ifnet_filter);
 307 TAILQ_HEAD(ddesc_head_name, dlil_demux_desc);
 308
 309 /* bottom 16 bits reserved for hardware checksum */
 310 #define IF_HWASSIST_CSUM_IP             0x0001  /* will csum IP */
 311 #define IF_HWASSIST_CSUM_TCP            0x0002  /* will csum TCP */
 312 #define IF_HWASSIST_CSUM_UDP            0x0004  /* will csum UDP */
 313 #define IF_HWASSIST_CSUM_IP_FRAGS       0x0008  /* will csum IP fragments */
 314 #define IF_HWASSIST_CSUM_FRAGMENT       0x0010  /* will do IP fragmentation */
 315 #define IF_HWASSIST_CSUM_TCP_SUM16      0x1000  /* simple TCP Sum16 computation */
 316 #define IF_HWASSIST_CSUM_MASK           0xffff
 317 #define IF_HWASSIST_CSUM_FLAGS(hwassist)        ((hwassist) & IF_HWASSIST_CSUM_MASK)
 318
 319 /* VLAN support */
 320 #define IF_HWASSIST_VLAN_TAGGING        0x10000 /* supports VLAN tagging */
 321 #define IF_HWASSIST_VLAN_MTU            0x20000 /* supports VLAN MTU-sized packet (for software VLAN) */
 322
 323 #define IFNET_RW_LOCK 1
 324
 325 #endif /* PRIVATE */
 326 /*
 327  * Structure defining a queue for a network interface.
 328  */
 329 struct  ifqueue {
 330         void *ifq_head;
 331         void *ifq_tail;
 332         int     ifq_len;
 333         int     ifq_maxlen;
 334         int     ifq_drops;
 335 };
 336
 337 #ifdef PRIVATE
 338
 339 struct ddesc_head_str;
 340 struct proto_hash_entry;
 341 struct kev_msg;
 342 struct dlil_threading_info;
 343
 344 /*
 345  * Structure defining a network interface.
 346  *
 347  * (Would like to call this struct ``if'', but C isn't PL/1.)
 348  */
 349 struct ifnet {
 350         void    *if_softc;              /* pointer to driver state */
 351         const char      *if_name;               /* name, e.g. ``en'' or ``lo'' */
 352         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 353         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
 354         u_long  if_refcnt;
 355 #ifdef __KPI_INTERFACE__
 356         ifnet_check_multi       if_check_multi;
 357 #else
 358         void*                           if_check_multi;
 359 #endif __KPI_INTERFACE__
 360         int     if_pcount;              /* number of promiscuous listeners */
 361         struct  bpf_if *if_bpf;         /* packet filter structure */
 362         u_short if_index;               /* numeric abbreviation for this if  */
 363         short   if_unit;                /* sub-unit for lower level driver */
 364         short   if_timer;               /* time 'til if_watchdog called */
 365         short   if_flags;               /* up/down, broadcast, etc. */
 366         int     if_ipending;            /* interrupts pending */
 367         void    *if_linkmib;            /* link-type-specific MIB data */
 368         size_t  if_linkmiblen;          /* length of above data */
 369         struct  if_data_internal if_data;
 370
 371 /* New with DLIL */
 372 #ifdef BSD_KERNEL_PRIVATE
 373         int     if_usecnt;
 374 #else
 375         int     refcnt;
 376 #endif
 377 #ifdef __KPI_INTERFACE__
 378         ifnet_output_func       if_output;
 379         ifnet_ioctl_func        if_ioctl;
 380         ifnet_set_bpf_tap       if_set_bpf_tap;
 381         ifnet_detached_func     if_free;
 382         ifnet_demux_func        if_demux;
 383         ifnet_event_func        if_event;
 384         ifnet_framer_func       if_framer;
 385         ifnet_family_t          if_family;              /* ulong assigned by Apple */
 386 #else
 387         void*                           if_output;
 388         void*                           if_ioctl;
 389         void*                           if_set_bpf_tap;
 390         void*                           if_free;
 391         void*                           if_demux;
 392         void*                           if_event;
 393         void*                           if_framer;
 394         u_long                          if_family;              /* ulong assigned by Apple */
 395 #endif
 396
 397         struct ifnet_filter_head if_flt_head;
 398
 399 /* End DLIL specific */
 400
 401         u_long  if_delayed_detach; /* need to perform delayed detach */
 402         void    *if_private;    /* private to interface */
 403         long    if_eflags;              /* autoaddr, autoaddr done, etc. */
 404
 405         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 406         int     if_amcount;             /* number of all-multicast requests */
 407 /* procedure handles */
 408 #ifdef __KPI_INTERFACE__
 409         ifnet_add_proto_func    if_add_proto;
 410         ifnet_del_proto_func    if_del_proto;
 411 #else __KPI_INTERFACE__
 412         void*   if_add_proto;
 413         void*   if_del_proto;
 414 #endif __KPI_INTERFACE__
 415         struct proto_hash_entry *if_proto_hash;
 416         void                                    *if_kpi_storage;
 417 #if 0
 418         void    *unused_was_init;
 419 #else
 420         struct dlil_threading_info *if_input_thread;
 421 #endif
 422         void    *unused_was_resolvemulti;
 423
 424         struct ifqueue  if_snd;
 425         u_long  unused_2[1];
 426 #ifdef __APPLE__
 427         u_long  family_cookie;
 428         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 429
 430 #ifdef _KERN_LOCKS_H_
 431 #if IFNET_RW_LOCK
 432         lck_rw_t *if_lock;              /* Lock to protect this interface */
 433 #else
 434         lck_mtx_t *if_lock;             /* Lock to protect this interface */
 435 #endif
 436 #else
 437         void    *if_lock;
 438 #endif
 439
 440 #else
 441         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 442 #endif /* __APPLE__ */
 443         struct {
 444                 u_long  length;
 445                 union {
 446                         u_char  buffer[8];
 447                         u_char  *ptr;
 448                 } u;
 449         } if_broadcast;
 450 #if CONFIG_MACF_NET
 451         struct  label *if_label;        /* interface MAC label */
 452 #endif
 453 };
 454
 455 #ifndef __APPLE__
 456 /* for compatibility with other BSDs */
 457 #define if_addrlist     if_addrhead
 458 #define if_list         if_link
 459 #endif !__APPLE__
 460
 461
 462 #endif /* PRIVATE */
 463
 464 #ifdef KERNEL_PRIVATE
 465 /*
 466  * Structure describing a `cloning' interface.
 467  */
 468 struct if_clone {
 469         LIST_ENTRY(if_clone) ifc_list;  /* on list of cloners */
 470         const char *ifc_name;                   /* name of device, e.g. `vlan' */
 471         size_t ifc_namelen;             /* length of name */
 472         int ifc_minifs;                 /* minimum number of interfaces */
 473         int ifc_maxunit;                /* maximum unit number */
 474         unsigned char *ifc_units;       /* bitmap to handle units */
 475         int ifc_bmlen;                  /* bitmap length */
 476
 477         int     (*ifc_create)(struct if_clone *, int);
 478         void    (*ifc_destroy)(struct ifnet *);
 479 };
 480
 481 #define IF_CLONE_INITIALIZER(name, create, destroy, minifs, maxunit)    \
 482     { { NULL, NULL }, name, sizeof(name) - 1, minifs, maxunit, NULL, 0, create, destroy }
 483
 484 /*
 485  * Bit values in if_ipending
 486  */
 487 #define IFI_RECV        1       /* I want to receive */
 488 #define IFI_XMIT        2       /* I want to transmit */
 489
 490 /*
 491  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 492  * are queues of messages stored on ifqueue structures
 493  * (defined above).  Entries are added to and deleted from these structures
 494  * by these macros, which should be called with ipl raised to splimp().
 495  */
 496 #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 497 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 498 #define IF_ENQUEUE(ifq, m) { \
 499         (m)->m_nextpkt = 0; \
 500         if ((ifq)->ifq_tail == 0) \
 501                 (ifq)->ifq_head = m; \
 502         else \
 503                 ((struct mbuf*)(ifq)->ifq_tail)->m_nextpkt = m; \
 504         (ifq)->ifq_tail = m; \
 505         (ifq)->ifq_len++; \
 506 }
 507 #define IF_PREPEND(ifq, m) { \
 508         (m)->m_nextpkt = (ifq)->ifq_head; \
 509         if ((ifq)->ifq_tail == 0) \
 510                 (ifq)->ifq_tail = (m); \
 511         (ifq)->ifq_head = (m); \
 512         (ifq)->ifq_len++; \
 513 }
 514 #define IF_DEQUEUE(ifq, m) { \
 515         (m) = (ifq)->ifq_head; \
 516         if (m) { \
 517                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
 518                         (ifq)->ifq_tail = 0; \
 519                 (m)->m_nextpkt = 0; \
 520                 (ifq)->ifq_len--; \
 521         } \
 522 }
 523
 524 #define IF_ENQ_DROP(ifq, m)     if_enq_drop(ifq, m)
 525
 526 #if defined(__GNUC__) && defined(MT_HEADER)
 527 static __inline int
 528 if_queue_drop(struct ifqueue *ifq, __unused struct mbuf *m)
 529 {
 530         IF_DROP(ifq);
 531         return 0;
 532 }
 533
 534 static __inline int
 535 if_enq_drop(struct ifqueue *ifq, struct mbuf *m)
 536 {
 537         if (IF_QFULL(ifq) &&
 538             !if_queue_drop(ifq, m))
 539                 return 0;
 540         IF_ENQUEUE(ifq, m);
 541         return 1;
 542 }
 543 #else
 544
 545 #ifdef MT_HEADER
 546 int     if_enq_drop(struct ifqueue *, struct mbuf *);
 547 #endif MT_HEADER
 548
 549 #endif defined(__GNUC__) && defined(MT_HEADER)
 550
 551 #endif /* KERNEL_PRIVATE */
 552
 553
 554 #ifdef PRIVATE
 555 /*
 556  * The ifaddr structure contains information about one address
 557  * of an interface.  They are maintained by the different address families,
 558  * are allocated and attached when an address is set, and are linked
 559  * together so all addresses for an interface can be located.
 560  */
 561 struct ifaddr {
 562         struct  sockaddr *ifa_addr;     /* address of interface */
 563         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 564 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 565         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 566         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 567         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
 568         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 569                 (int, struct rtentry *, struct sockaddr *);
 570         u_short ifa_flags;              /* mostly rt_flags for cloning */
 571         int     ifa_refcnt;/* 32bit ref count, use ifaref, ifafree */
 572         int     ifa_metric;             /* cost of going out this interface */
 573 #ifdef notdef
 574         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 575 #endif
 576         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 577                 (struct ifaddr *, const struct sockaddr *);
 578         u_long  ifa_debug;              /* debug flags */
 579 };
 580 #define IFA_ROUTE       RTF_UP          /* route installed (0x1) */
 581 #define IFA_CLONING     RTF_CLONING     /* (0x100) */
 582 #define IFA_ATTACHED    0x1             /* ifa_debug: IFA is attached to an interface */
 583
 584 #endif /* PRIVATE */
 585
 586 #ifdef KERNEL_PRIVATE
 587 /*
 588  * The prefix structure contains information about one prefix
 589  * of an interface.  They are maintained by the different address families,
 590  * are allocated and attached when an prefix or an address is set,
 591  * and are linked together so all prefixes for an interface can be located.
 592  */
 593 struct ifprefix {
 594         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 595         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 596         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 597         u_char  ifpr_plen;              /* prefix length in bits */
 598         u_char  ifpr_type;              /* protocol dependent prefix type */
 599 };
 600 #endif /* KERNEL_PRIVATE */
 601
 602 #ifdef PRIVATE
 603 typedef void (*ifma_protospec_free_func)(void* ifma_protospec);
 604
 605 /*
 606  * Multicast address structure.  This is analogous to the ifaddr
 607  * structure except that it keeps track of multicast addresses.
 608  * Also, the reference count here is a count of requests for this
 609  * address, not a count of pointers to this structure.
 610  */
 611 struct ifmultiaddr {
 612         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 613         struct  sockaddr *ifma_addr;    /* address this membership is for */
 614         struct ifmultiaddr *ifma_ll;    /* link-layer translation, if any */
 615         struct  ifnet *ifma_ifp;                /* back-pointer to interface */
 616         u_int   ifma_usecount;                  /* use count, protected by ifp's lock */
 617         void    *ifma_protospec;                /* protocol-specific state, if any */
 618         int32_t ifma_refcount;                  /* reference count, atomically protected */
 619         ifma_protospec_free_func ifma_free;     /* function called to free ifma_protospec */
 620 };
 621 #endif /* PRIVATE */
 622
 623 #ifdef KERNEL_PRIVATE
 624 #define IFAREF(ifa) ifaref(ifa)
 625 #define IFAFREE(ifa) ifafree(ifa)
 626
 627 /*
 628  * To preserve kmem compatibility, we define
 629  * ifnet_head to ifnet. This should be temp.
 630  */
 631 #define ifnet_head ifnet
 632 extern  struct ifnethead ifnet_head;
 633 extern struct   ifnet   **ifindex2ifnet;
 634 extern  int ifqmaxlen;
 635 extern  ifnet_t  lo_ifp;
 636 extern  int if_index;
 637 extern  struct ifaddr **ifnet_addrs;
 638
 639 int     if_addmulti(struct ifnet *, const struct sockaddr *, struct ifmultiaddr **);
 640 int     if_allmulti(struct ifnet *, int);
 641 void    if_attach(struct ifnet *);
 642 int     if_delmultiaddr(struct ifmultiaddr *ifma, int locked);
 643 int     if_delmulti(struct ifnet *, const struct sockaddr *);
 644 void    if_down(struct ifnet *);
 645 int     if_down_all(void);
 646 void    if_route(struct ifnet *, int flag, int fam);
 647 void    if_unroute(struct ifnet *, int flag, int fam);
 648 void    if_up(struct ifnet *);
 649 void    if_updown(struct ifnet *ifp, int up);
 650 /*void  ifinit(void));*/ /* declared in systm.h for main( */
 651 int     ifioctl(struct socket *, u_long, caddr_t, struct proc *);
 652 int     ifioctllocked(struct socket *, u_long, caddr_t, struct proc *);
 653 struct  ifnet *ifunit(const char *);
 654 struct  ifnet *if_withname(struct sockaddr *);
 655
 656 void    if_clone_attach(struct if_clone *);
 657 void    if_clone_detach(struct if_clone *);
 658
 659 void    ifnet_lock_assert(struct ifnet *ifp, int what);
 660 void    ifnet_lock_shared(struct ifnet *ifp);
 661 void    ifnet_lock_exclusive(struct ifnet *ifp);
 662 void    ifnet_lock_done(struct ifnet *ifp);
 663
 664 void    ifnet_head_lock_shared(void);
 665 void    ifnet_head_lock_exclusive(void);
 666 void    ifnet_head_done(void);
 667
 668 void    if_attach_ifa(struct ifnet * ifp, struct ifaddr *ifa);
 669 void    if_detach_ifa(struct ifnet * ifp, struct ifaddr *ifa);
 670
 671 void    ifma_reference(struct ifmultiaddr *ifma);
 672 void    ifma_release(struct ifmultiaddr *ifma);
 673
 674 struct  ifaddr *ifa_ifwithaddr(const struct sockaddr *);
 675 struct  ifaddr *ifa_ifwithdstaddr(const struct sockaddr *);
 676 struct  ifaddr *ifa_ifwithnet(const struct sockaddr *);
 677 struct  ifaddr *ifa_ifwithroute(int, const struct sockaddr *, const struct sockaddr *);
 678 struct  ifaddr *ifa_ifwithroute_locked(int, const struct sockaddr *, const struct sockaddr *);
 679 struct  ifaddr *ifaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
 680 struct  ifaddr *ifa_ifpgetprimary(struct ifnet *, int);
 681 void    ifafree(struct ifaddr *);
 682 void    ifaref(struct ifaddr *);
 683
 684 struct  ifmultiaddr *ifmaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
 685
 686 int     ifa_foraddr(unsigned int addr);
 687
 688 #ifdef BSD_KERNEL_PRIVATE
 689 enum {
 690         kIfNetUseCount_MayBeZero = 0,
 691         kIfNetUseCount_MustNotBeZero = 1
 692 };
 693
 694 int ifp_use(struct ifnet *ifp, int handle_zero);
 695 int ifp_unuse(struct ifnet *ifp);
 696 void ifp_use_reached_zero(struct ifnet *ifp);
 697
 698 void    if_data_internal_to_if_data(struct ifnet *ifp, const struct if_data_internal *if_data_int,
 699                            struct if_data *if_data);
 700 void    if_data_internal_to_if_data64(struct ifnet *ifp, const struct if_data_internal *if_data_int,
 701                                                            struct if_data64 *if_data64);
 702 #endif /* BSD_KERNEL_PRIVATE */
 703 #endif /* KERNEL_PRIVATE */
 704 #endif /* !_NET_IF_VAR_H_ */