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