bsd/net/if_var.h

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