bsd/net/if_var.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, 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      unsigned long      if_family;
 136      unsigned long      if_unit;
 137      char               if_name[IFNAMSIZ];
 138 };
 139
 140 /*
 141  * Structure describing information about an interface
 142  * which may be of interest to management entities.
 143  */
 144 struct if_data {
 145         /* generic interface information */
 146         unsigned char   ifi_type;       /* ethernet, tokenring, etc */
 147 #ifdef __APPLE__
 148         unsigned char   ifi_typelen;    /* Length of frame type id */
 149 #endif
 150         unsigned char   ifi_physical;   /* e.g., AUI, Thinnet, 10base-T, etc */
 151         unsigned char   ifi_addrlen;    /* media address length */
 152         unsigned char   ifi_hdrlen;     /* media header length */
 153         unsigned char   ifi_recvquota;  /* polling quota for receive intrs */
 154         unsigned char   ifi_xmitquota;  /* polling quota for xmit intrs */
 155         unsigned char   ifi_unused1;    /* for future use */
 156         unsigned long   ifi_mtu;        /* maximum transmission unit */
 157         unsigned long   ifi_metric;     /* routing metric (external only) */
 158         unsigned long   ifi_baudrate;   /* linespeed */
 159         /* volatile statistics */
 160         unsigned long   ifi_ipackets;   /* packets received on interface */
 161         unsigned long   ifi_ierrors;    /* input errors on interface */
 162         unsigned long   ifi_opackets;   /* packets sent on interface */
 163         unsigned long   ifi_oerrors;    /* output errors on interface */
 164         unsigned long   ifi_collisions; /* collisions on csma interfaces */
 165         unsigned long   ifi_ibytes;     /* total number of octets received */
 166         unsigned long   ifi_obytes;     /* total number of octets sent */
 167         unsigned long   ifi_imcasts;    /* packets received via multicast */
 168         unsigned long   ifi_omcasts;    /* packets sent via multicast */
 169         unsigned long   ifi_iqdrops;    /* dropped on input, this interface */
 170         unsigned long   ifi_noproto;    /* destined for unsupported protocol */
 171         unsigned long   ifi_recvtiming; /* usec spent receiving when timing */
 172         unsigned long   ifi_xmittiming; /* usec spent xmitting when timing */
 173         struct  timeval ifi_lastchange; /* time of last administrative change */
 174         unsigned long   ifi_unused2;    /* used to be the default_proto */
 175         unsigned long   ifi_hwassist;   /* HW offload capabilities */
 176         unsigned long   ifi_reserved1;  /* for future use */
 177         unsigned long   ifi_reserved2;  /* for future use */
 178 };
 179
 180 /*
 181  * Structure describing information about an interface
 182  * which may be of interest to management entities.
 183  */
 184 struct if_data64 {
 185         /* generic interface information */
 186         u_char  ifi_type;               /* ethernet, tokenring, etc */
 187 #ifdef __APPLE__
 188         u_char  ifi_typelen;            /* Length of frame type id */
 189 #endif
 190         u_char          ifi_physical;           /* e.g., AUI, Thinnet, 10base-T, etc */
 191         u_char          ifi_addrlen;            /* media address length */
 192         u_char          ifi_hdrlen;             /* media header length */
 193         u_char          ifi_recvquota;          /* polling quota for receive intrs */
 194         u_char          ifi_xmitquota;          /* polling quota for xmit intrs */
 195         u_char          ifi_unused1;            /* for future use */
 196         u_long          ifi_mtu;                /* maximum transmission unit */
 197         u_long          ifi_metric;             /* routing metric (external only) */
 198         u_int64_t       ifi_baudrate;           /* linespeed */
 199         /* volatile statistics */
 200         u_int64_t       ifi_ipackets;           /* packets received on interface */
 201         u_int64_t       ifi_ierrors;            /* input errors on interface */
 202         u_int64_t       ifi_opackets;           /* packets sent on interface */
 203         u_int64_t       ifi_oerrors;            /* output errors on interface */
 204         u_int64_t       ifi_collisions;         /* collisions on csma interfaces */
 205         u_int64_t       ifi_ibytes;             /* total number of octets received */
 206         u_int64_t       ifi_obytes;             /* total number of octets sent */
 207         u_int64_t       ifi_imcasts;            /* packets received via multicast */
 208         u_int64_t       ifi_omcasts;            /* packets sent via multicast */
 209         u_int64_t       ifi_iqdrops;            /* dropped on input, this interface */
 210         u_int64_t       ifi_noproto;            /* destined for unsupported protocol */
 211         u_long          ifi_recvtiming;         /* usec spent receiving when timing */
 212         u_long          ifi_xmittiming;         /* usec spent xmitting when timing */
 213         struct  timeval ifi_lastchange; /* time of last administrative change */
 214 };
 215
 216 #ifdef PRIVATE
 217 /*
 218  * Internal storage of if_data. This is bound to change. Various places in the
 219  * stack will translate this data structure in to the externally visible
 220  * if_data structure above.
 221  */
 222 struct if_data_internal {
 223         /* generic interface information */
 224         u_char  ifi_type;               /* ethernet, tokenring, etc */
 225         u_char  ifi_typelen;    /* Length of frame type id */
 226         u_char  ifi_physical;   /* e.g., AUI, Thinnet, 10base-T, etc */
 227         u_char  ifi_addrlen;    /* media address length */
 228         u_char  ifi_hdrlen;             /* media header length */
 229         u_char  ifi_recvquota;  /* polling quota for receive intrs */
 230         u_char  ifi_xmitquota;  /* polling quota for xmit intrs */
 231     u_char      ifi_unused1;    /* for future use */
 232         u_long  ifi_mtu;                /* maximum transmission unit */
 233         u_long  ifi_metric;             /* routing metric (external only) */
 234         u_long  ifi_baudrate;   /* linespeed */
 235         /* volatile statistics */
 236         u_int64_t       ifi_ipackets;   /* packets received on interface */
 237         u_int64_t       ifi_ierrors;    /* input errors on interface */
 238         u_int64_t       ifi_opackets;   /* packets sent on interface */
 239         u_int64_t       ifi_oerrors;    /* output errors on interface */
 240         u_int64_t       ifi_collisions; /* collisions on csma interfaces */
 241         u_int64_t       ifi_ibytes;             /* total number of octets received */
 242         u_int64_t       ifi_obytes;             /* total number of octets sent */
 243         u_int64_t       ifi_imcasts;    /* packets received via multicast */
 244         u_int64_t       ifi_omcasts;    /* packets sent via multicast */
 245         u_int64_t       ifi_iqdrops;    /* dropped on input, this interface */
 246         u_int64_t       ifi_noproto;    /* destined for unsupported protocol */
 247         u_long  ifi_recvtiming;         /* usec spent receiving when timing */
 248         u_long  ifi_xmittiming;         /* usec spent xmitting when timing */
 249 #define IF_LASTCHANGEUPTIME     1       /* lastchange: 1-uptime 0-calendar time */
 250         struct  timeval ifi_lastchange; /* time of last administrative change */
 251         u_long  ifi_hwassist;           /* HW offload capabilities */
 252 };
 253
 254 #define if_mtu          if_data.ifi_mtu
 255 #define if_type         if_data.ifi_type
 256 #define if_typelen      if_data.ifi_typelen
 257 #define if_physical     if_data.ifi_physical
 258 #define if_addrlen      if_data.ifi_addrlen
 259 #define if_hdrlen       if_data.ifi_hdrlen
 260 #define if_metric       if_data.ifi_metric
 261 #define if_baudrate     if_data.ifi_baudrate
 262 #define if_hwassist     if_data.ifi_hwassist
 263 #define if_ipackets     if_data.ifi_ipackets
 264 #define if_ierrors      if_data.ifi_ierrors
 265 #define if_opackets     if_data.ifi_opackets
 266 #define if_oerrors      if_data.ifi_oerrors
 267 #define if_collisions   if_data.ifi_collisions
 268 #define if_ibytes       if_data.ifi_ibytes
 269 #define if_obytes       if_data.ifi_obytes
 270 #define if_imcasts      if_data.ifi_imcasts
 271 #define if_omcasts      if_data.ifi_omcasts
 272 #define if_iqdrops      if_data.ifi_iqdrops
 273 #define if_noproto      if_data.ifi_noproto
 274 #define if_lastchange   if_data.ifi_lastchange
 275 #define if_recvquota    if_data.ifi_recvquota
 276 #define if_xmitquota    if_data.ifi_xmitquota
 277 #define if_iflags       if_data.ifi_iflags
 278
 279 struct  mbuf;
 280 struct ifaddr;
 281 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 282 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
 283 TAILQ_HEAD(ifprefixhead, ifprefix);
 284 LIST_HEAD(ifmultihead, ifmultiaddr);
 285 struct tqdummy;
 286 TAILQ_HEAD(tailq_head, tqdummy);
 287
 288 /*
 289  * Forward structure declarations for function prototypes [sic].
 290  */
 291 struct  proc;
 292 struct  rtentry;
 293 struct  socket;
 294 struct  ether_header;
 295 struct  sockaddr_dl;
 296 struct ifnet_filter;
 297
 298 TAILQ_HEAD(ifnet_filter_head, ifnet_filter);
 299 TAILQ_HEAD(ddesc_head_name, dlil_demux_desc);
 300
 301 /* bottom 16 bits reserved for hardware checksum */
 302 #define IF_HWASSIST_CSUM_IP             0x0001  /* will csum IP */
 303 #define IF_HWASSIST_CSUM_TCP            0x0002  /* will csum TCP */
 304 #define IF_HWASSIST_CSUM_UDP            0x0004  /* will csum UDP */
 305 #define IF_HWASSIST_CSUM_IP_FRAGS       0x0008  /* will csum IP fragments */
 306 #define IF_HWASSIST_CSUM_FRAGMENT       0x0010  /* will do IP fragmentation */
 307 #define IF_HWASSIST_CSUM_TCP_SUM16      0x1000  /* simple TCP Sum16 computation */
 308 #define IF_HWASSIST_CSUM_MASK           0xffff
 309 #define IF_HWASSIST_CSUM_FLAGS(hwassist)        ((hwassist) & IF_HWASSIST_CSUM_MASK)
 310
 311 /* VLAN support */
 312 #define IF_HWASSIST_VLAN_TAGGING        0x10000 /* supports VLAN tagging */
 313 #define IF_HWASSIST_VLAN_MTU            0x20000 /* supports VLAN MTU-sized packet (for software VLAN) */
 314
 315 #define IFNET_RW_LOCK 1
 316
 317 /*
 318  * Structure defining a queue for a network interface.
 319  */
 320 struct  ifqueue {
 321         void *ifq_head;
 322         void *ifq_tail;
 323         int     ifq_len;
 324         int     ifq_maxlen;
 325         int     ifq_drops;
 326 };
 327
 328 struct ddesc_head_str;
 329 struct proto_hash_entry;
 330 struct kev_msg;
 331
 332 /*
 333  * Structure defining a network interface.
 334  *
 335  * (Would like to call this struct ``if'', but C isn't PL/1.)
 336  */
 337 struct ifnet {
 338         void    *if_softc;              /* pointer to driver state */
 339         const char      *if_name;               /* name, e.g. ``en'' or ``lo'' */
 340         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 341         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
 342         u_long  if_refcnt;
 343 #ifdef __KPI_INTERFACE__
 344         ifnet_check_multi       if_check_multi;
 345 #else
 346         void*                           if_check_multi;
 347 #endif __KPI_INTERFACE__
 348         int     if_pcount;              /* number of promiscuous listeners */
 349         struct  bpf_if *if_bpf;         /* packet filter structure */
 350         u_short if_index;               /* numeric abbreviation for this if  */
 351         short   if_unit;                /* sub-unit for lower level driver */
 352         short   if_timer;               /* time 'til if_watchdog called */
 353         short   if_flags;               /* up/down, broadcast, etc. */
 354         int     if_ipending;            /* interrupts pending */
 355         void    *if_linkmib;            /* link-type-specific MIB data */
 356         size_t  if_linkmiblen;          /* length of above data */
 357         struct  if_data_internal if_data;
 358
 359 /* New with DLIL */
 360 #ifdef BSD_KERNEL_PRIVATE
 361         int     if_usecnt;
 362 #else
 363         int     refcnt;
 364 #endif
 365         int     offercnt;
 366 #ifdef __KPI_INTERFACE__
 367         ifnet_output_func       if_output;
 368         ifnet_ioctl_func        if_ioctl;
 369         ifnet_set_bpf_tap       if_set_bpf_tap;
 370         ifnet_detached_func     if_free;
 371         ifnet_demux_func        if_demux;
 372         ifnet_event_func        if_event;
 373         ifnet_framer_func       if_framer;
 374         ifnet_family_t          if_family;              /* ulong assigned by Apple */
 375 #else
 376         void*                           if_output;
 377         void*                           if_ioctl;
 378         void*                           if_set_bpf_tap;
 379         void*                           if_free;
 380         void*                           if_demux;
 381         void*                           if_event;
 382         void*                           if_framer;
 383         u_long                          if_family;              /* ulong assigned by Apple */
 384 #endif
 385
 386         struct ifnet_filter_head if_flt_head;
 387
 388 /* End DLIL specific */
 389
 390         u_long  if_delayed_detach; /* need to perform delayed detach */
 391         void    *if_private;    /* private to interface */
 392         long    if_eflags;              /* autoaddr, autoaddr done, etc. */
 393
 394         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 395         int     if_amcount;             /* number of all-multicast requests */
 396 /* procedure handles */
 397 #ifdef __KPI_INTERFACE__
 398         union {
 399                 int     (*original)(struct ifnet *ifp, u_long protocol_family,
 400                         struct ddesc_head_str *demux_desc_head);
 401                 ifnet_add_proto_func    kpi;
 402         } if_add_proto_u;
 403         ifnet_del_proto_func    if_del_proto;
 404 #else __KPI_INTERFACE__
 405         void*   if_add_proto;
 406         void*   if_del_proto;
 407 #endif __KPI_INTERFACE__
 408         struct proto_hash_entry *if_proto_hash;
 409         void                                    *if_kpi_storage;
 410
 411         void    *unused_was_init;
 412         void    *unused_was_resolvemulti;
 413
 414         struct ifqueue  if_snd;
 415         u_long  unused_2[1];
 416 #ifdef __APPLE__
 417         u_long  family_cookie;
 418         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 419
 420 #ifdef _KERN_LOCKS_H_
 421 #if IFNET_RW_LOCK
 422         lck_rw_t *if_lock;              /* Lock to protect this interface */
 423 #else
 424         lck_mtx_t *if_lock;             /* Lock to protect this interface */
 425 #endif
 426 #else
 427         void    *if_lock;
 428 #endif
 429
 430 #else
 431         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 432 #endif /* __APPLE__ */
 433         struct {
 434                 u_long  length;
 435                 union {
 436                         u_char  buffer[8];
 437                         u_char  *ptr;
 438                 } u;
 439         } if_broadcast;
 440 };
 441
 442 #define if_add_proto    if_add_proto_u.original
 443
 444 #ifndef __APPLE__
 445 /* for compatibility with other BSDs */
 446 #define if_addrlist     if_addrhead
 447 #define if_list         if_link
 448 #endif !__APPLE__
 449
 450
 451 #endif /* PRIVATE */
 452
 453 #ifdef KERNEL_PRIVATE
 454 /*
 455  * Structure describing a `cloning' interface.
 456  */
 457 struct if_clone {
 458         LIST_ENTRY(if_clone) ifc_list;  /* on list of cloners */
 459         const char *ifc_name;                   /* name of device, e.g. `vlan' */
 460         size_t ifc_namelen;             /* length of name */
 461         int ifc_minifs;                 /* minimum number of interfaces */
 462         int ifc_maxunit;                /* maximum unit number */
 463         unsigned char *ifc_units;       /* bitmap to handle units */
 464         int ifc_bmlen;                  /* bitmap length */
 465
 466         int     (*ifc_create)(struct if_clone *, int);
 467         void    (*ifc_destroy)(struct ifnet *);
 468 };
 469
 470 #define IF_CLONE_INITIALIZER(name, create, destroy, minifs, maxunit)    \
 471     { { 0, 0 }, name, sizeof(name) - 1, minifs, maxunit, NULL, 0, create, destroy }
 472
 473 /*
 474  * Bit values in if_ipending
 475  */
 476 #define IFI_RECV        1       /* I want to receive */
 477 #define IFI_XMIT        2       /* I want to transmit */
 478
 479 /*
 480  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 481  * are queues of messages stored on ifqueue structures
 482  * (defined above).  Entries are added to and deleted from these structures
 483  * by these macros, which should be called with ipl raised to splimp().
 484  */
 485 #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 486 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 487 #define IF_ENQUEUE(ifq, m) { \
 488         (m)->m_nextpkt = 0; \
 489         if ((ifq)->ifq_tail == 0) \
 490                 (ifq)->ifq_head = m; \
 491         else \
 492                 ((struct mbuf*)(ifq)->ifq_tail)->m_nextpkt = m; \
 493         (ifq)->ifq_tail = m; \
 494         (ifq)->ifq_len++; \
 495 }
 496 #define IF_PREPEND(ifq, m) { \
 497         (m)->m_nextpkt = (ifq)->ifq_head; \
 498         if ((ifq)->ifq_tail == 0) \
 499                 (ifq)->ifq_tail = (m); \
 500         (ifq)->ifq_head = (m); \
 501         (ifq)->ifq_len++; \
 502 }
 503 #define IF_DEQUEUE(ifq, m) { \
 504         (m) = (ifq)->ifq_head; \
 505         if (m) { \
 506                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
 507                         (ifq)->ifq_tail = 0; \
 508                 (m)->m_nextpkt = 0; \
 509                 (ifq)->ifq_len--; \
 510         } \
 511 }
 512
 513 #define IF_ENQ_DROP(ifq, m)     if_enq_drop(ifq, m)
 514
 515 #if defined(__GNUC__) && defined(MT_HEADER)
 516 static __inline int
 517 if_queue_drop(struct ifqueue *ifq, __unused struct mbuf *m)
 518 {
 519         IF_DROP(ifq);
 520         return 0;
 521 }
 522
 523 static __inline int
 524 if_enq_drop(struct ifqueue *ifq, struct mbuf *m)
 525 {
 526         if (IF_QFULL(ifq) &&
 527             !if_queue_drop(ifq, m))
 528                 return 0;
 529         IF_ENQUEUE(ifq, m);
 530         return 1;
 531 }
 532 #else
 533
 534 #ifdef MT_HEADER
 535 int     if_enq_drop(struct ifqueue *, struct mbuf *);
 536 #endif MT_HEADER
 537
 538 #endif defined(__GNUC__) && defined(MT_HEADER)
 539
 540 #endif /* KERNEL_PRIVATE */
 541
 542
 543 #ifdef PRIVATE
 544 /*
 545  * The ifaddr structure contains information about one address
 546  * of an interface.  They are maintained by the different address families,
 547  * are allocated and attached when an address is set, and are linked
 548  * together so all addresses for an interface can be located.
 549  */
 550 struct ifaddr {
 551         struct  sockaddr *ifa_addr;     /* address of interface */
 552         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 553 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 554         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 555         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 556         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
 557         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 558                 (int, struct rtentry *, struct sockaddr *);
 559         u_short ifa_flags;              /* mostly rt_flags for cloning */
 560         int     ifa_refcnt;/* 32bit ref count, use ifaref, ifafree */
 561         int     ifa_metric;             /* cost of going out this interface */
 562 #ifdef notdef
 563         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 564 #endif
 565         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 566                 (struct ifaddr *, const struct sockaddr *);
 567         u_long  ifa_debug;              /* debug flags */
 568 };
 569 #define IFA_ROUTE       RTF_UP          /* route installed (0x1) */
 570 #define IFA_CLONING     RTF_CLONING     /* (0x100) */
 571 #define IFA_ATTACHED    0x1             /* ifa_debug: IFA is attached to an interface */
 572
 573 #endif /* PRIVATE */
 574
 575 #ifdef KERNEL_PRIVATE
 576 /*
 577  * The prefix structure contains information about one prefix
 578  * of an interface.  They are maintained by the different address families,
 579  * are allocated and attached when an prefix or an address is set,
 580  * and are linked together so all prefixes for an interface can be located.
 581  */
 582 struct ifprefix {
 583         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 584         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 585         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 586         u_char  ifpr_plen;              /* prefix length in bits */
 587         u_char  ifpr_type;              /* protocol dependent prefix type */
 588 };
 589 #endif /* KERNEL_PRIVATE */
 590
 591 #ifdef PRIVATE
 592 typedef void (*ifma_protospec_free_func)(void* ifma_protospec);
 593
 594 /*
 595  * Multicast address structure.  This is analogous to the ifaddr
 596  * structure except that it keeps track of multicast addresses.
 597  * Also, the reference count here is a count of requests for this
 598  * address, not a count of pointers to this structure.
 599  */
 600 struct ifmultiaddr {
 601         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 602         struct  sockaddr *ifma_addr;    /* address this membership is for */
 603         struct ifmultiaddr *ifma_ll;    /* link-layer translation, if any */
 604         struct  ifnet *ifma_ifp;                /* back-pointer to interface */
 605         u_int   ifma_usecount;                  /* use count, protected by ifp's lock */
 606         void    *ifma_protospec;                /* protocol-specific state, if any */
 607         int32_t ifma_refcount;                  /* reference count, atomically protected */
 608         ifma_protospec_free_func ifma_free;     /* function called to free ifma_protospec */
 609 };
 610 #endif /* PRIVATE */
 611
 612 #ifdef KERNEL_PRIVATE
 613 #define IFAREF(ifa) ifaref(ifa)
 614 #define IFAFREE(ifa) ifafree(ifa)
 615
 616 /*
 617  * To preserve kmem compatibility, we define
 618  * ifnet_head to ifnet. This should be temp.
 619  */
 620 #define ifnet_head ifnet
 621 extern  struct ifnethead ifnet_head;
 622 extern struct   ifnet   **ifindex2ifnet;
 623 extern  int ifqmaxlen;
 624 extern  struct ifnet loif[];
 625 extern  int if_index;
 626 extern  struct ifaddr **ifnet_addrs;
 627 extern struct ifnet *lo_ifp;
 628
 629 int     if_addmulti(struct ifnet *, const struct sockaddr *, struct ifmultiaddr **);
 630 int     if_allmulti(struct ifnet *, int);
 631 void    if_attach(struct ifnet *);
 632 int     if_delmultiaddr(struct ifmultiaddr *ifma, int locked);
 633 int     if_delmulti(struct ifnet *, const struct sockaddr *);
 634 void    if_down(struct ifnet *);
 635 void    if_route(struct ifnet *, int flag, int fam);
 636 void    if_unroute(struct ifnet *, int flag, int fam);
 637 void    if_up(struct ifnet *);
 638 void    if_updown(struct ifnet *ifp, int up);
 639 /*void  ifinit(void));*/ /* declared in systm.h for main( */
 640 int     ifioctl(struct socket *, u_long, caddr_t, struct proc *);
 641 int     ifioctllocked(struct socket *, u_long, caddr_t, struct proc *);
 642 struct  ifnet *ifunit(const char *);
 643 struct  ifnet *if_withname(struct sockaddr *);
 644
 645 void    if_clone_attach(struct if_clone *);
 646 void    if_clone_detach(struct if_clone *);
 647
 648 void    ifnet_lock_assert(struct ifnet *ifp, int what);
 649 void    ifnet_lock_shared(struct ifnet *ifp);
 650 void    ifnet_lock_exclusive(struct ifnet *ifp);
 651 void    ifnet_lock_done(struct ifnet *ifp);
 652
 653 void    ifnet_head_lock_shared(void);
 654 void    ifnet_head_lock_exclusive(void);
 655 void    ifnet_head_done(void);
 656
 657 void    if_attach_ifa(struct ifnet * ifp, struct ifaddr *ifa);
 658 void    if_detach_ifa(struct ifnet * ifp, struct ifaddr *ifa);
 659
 660 void    ifma_reference(struct ifmultiaddr *ifma);
 661 void    ifma_release(struct ifmultiaddr *ifma);
 662
 663 struct  ifaddr *ifa_ifwithaddr(const struct sockaddr *);
 664 struct  ifaddr *ifa_ifwithdstaddr(const struct sockaddr *);
 665 struct  ifaddr *ifa_ifwithnet(const struct sockaddr *);
 666 struct  ifaddr *ifa_ifwithroute(int, const struct sockaddr *, const struct sockaddr *);
 667 struct  ifaddr *ifaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
 668 void    ifafree(struct ifaddr *);
 669 void    ifaref(struct ifaddr *);
 670
 671 struct  ifmultiaddr *ifmaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
 672
 673 #ifdef BSD_KERNEL_PRIVATE
 674 void    if_data_internal_to_if_data(const struct if_data_internal *if_data_int,
 675                                                            struct if_data *if_data);
 676 void    if_data_internal_to_if_data64(const struct if_data_internal *if_data_int,
 677                                                            struct if_data64 *if_data64);
 678 #endif /* BSD_KERNEL_PRIVATE */
 679 #endif /* KERNEL_PRIVATE */
 680 #endif /* !_NET_IF_VAR_H_ */