sys/net/if_var.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
  34  * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.16 2003/04/15 18:11:19 fjoe Exp $
  35  * $DragonFly: src/sys/net/if_var.h,v 1.46 2008/03/16 15:30:20 sephe Exp $
  36  */
  37
  38 #ifndef _NET_IF_VAR_H_
  39 #define _NET_IF_VAR_H_
  40
  41 #ifndef _SYS_SERIALIZE_H_
  42 #include <sys/serialize.h>
  43 #endif
  44 #ifndef _NET_IF_H_
  45 #include <net/if.h>
  46 #endif
  47
  48 /*
  49  * Structures defining a network interface, providing a packet
  50  * transport mechanism (ala level 0 of the PUP protocols).
  51  *
  52  * Each interface accepts output datagrams of a specified maximum
  53  * length, and provides higher level routines with input datagrams
  54  * received from its medium.
  55  *
  56  * Output occurs when the routine if_output is called, with four parameters:
  57  *      ifp->if_output(ifp, m, dst, rt)
  58  * Here m is the mbuf chain to be sent and dst is the destination address.
  59  * The output routine encapsulates the supplied datagram if necessary,
  60  * and then transmits it on its medium.
  61  *
  62  * On input, each interface unwraps the data received by it, and either
  63  * places it on the input queue of a internetwork datagram routine
  64  * and posts the associated software interrupt, or passes the datagram to
  65  * the routine if_input. It is called with the mbuf chain as parameter:
  66  *      ifp->if_input(ifp, m)
  67  * The input routine removes the protocol dependent header if necessary.
  68  *
  69  * Routines exist for locating interfaces by their addresses
  70  * or for locating a interface on a certain network, as well as more general
  71  * routing and gateway routines maintaining information used to locate
  72  * interfaces.  These routines live in the files if.c and route.c
  73  */
  74
  75 /*
  76  * Forward structure declarations for function prototypes [sic].
  77  */
  78 struct  mbuf;
  79 struct  proc;
  80 struct  rtentry;
  81 struct  rt_addrinfo;
  82 struct  socket;
  83 struct  ether_header;
  84 struct  carp_if;
  85 struct  ucred;
  86 struct  lwkt_serialize;
  87 struct  ifaddr_container;
  88 struct  ifaddr;
  89 struct  lwkt_port;
  90
  91 #include <sys/queue.h>          /* get TAILQ macros */
  92
  93 #include <net/altq/if_altq.h>
  94
  95 #ifdef _KERNEL
  96 #include <sys/eventhandler.h>
  97 #include <sys/mbuf.h>
  98 #include <sys/systm.h>          /* XXX */
  99 #include <sys/thread2.h>
 100 #endif /* _KERNEL */
 101
 102 #define IF_DUNIT_NONE   -1
 103
 104 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 105 TAILQ_HEAD(ifaddrhead, ifaddr_container); /* instantiation is preserved in the list */
 106 TAILQ_HEAD(ifprefixhead, ifprefix);
 107 LIST_HEAD(ifmultihead, ifmultiaddr);
 108
 109 /*
 110  * Structure defining a queue for a network interface.
 111  */
 112 struct  ifqueue {
 113         struct  mbuf *ifq_head;
 114         struct  mbuf *ifq_tail;
 115         int     ifq_len;
 116         int     ifq_maxlen;
 117         int     ifq_drops;
 118 };
 119
 120 /*
 121  * Note of DEVICE_POLLING
 122  * 1) Any file(*.c) that depends on DEVICE_POLLING supports in this
 123  *    file should include opt_polling.h at its beginning.
 124  * 2) When struct changes, which are conditioned by DEVICE_POLLING,
 125  *    are to be introduced, please keep the struct's size and layout
 126  *    same, no matter whether DEVICE_POLLING is defined or not.
 127  *    See ifnet.if_poll and ifnet.if_poll_unused for example.
 128  */
 129
 130 #ifdef DEVICE_POLLING
 131 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER,
 132                 POLL_REGISTER };
 133 #endif
 134
 135 /*
 136  * Structure defining a network interface.
 137  *
 138  * (Would like to call this struct ``if'', but C isn't PL/1.)
 139  */
 140
 141 /*
 142  * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
 143  * one of these structures, typically held within an arpcom structure.
 144  *
 145  *      struct <foo>_softc {
 146  *              struct arpcom {
 147  *                      struct  ifnet ac_if;
 148  *                      ...
 149  *              } <arpcom> ;
 150  *              ...
 151  *      };
 152  *
 153  * The assumption is used in a number of places, including many
 154  * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
 155  *
 156  * Unfortunately devices' softc are opaque, so we depend on this layout
 157  * to locate the struct ifnet from the softc in the generic code.
 158  *
 159  * MPSAFE NOTES:
 160  *
 161  * ifnet and its related packet queues are protected by if_serializer.
 162  * Callers of if_output, if_ioctl, if_start, if_watchdog, if_init,
 163  * if_resolvemulti, and if_poll hold if_serializer.  Device drivers usually
 164  * use the same serializer for their interrupt but this is not required.
 165  * However, the device driver must be holding if_serializer when it
 166  * calls if_input.  Note that the serializer may be temporarily released
 167  * within if_input to avoid a deadlock (e.g. when fast-forwarding or
 168  * bridging packets between interfaces).
 169  *
 170  * If a device driver installs the same serializer for its interrupt
 171  * as for ifnet, then the driver only really needs to worry about further
 172  * serialization in timeout based entry points.  All other entry points
 173  * will already be serialized.  Older ISA drivers still using the old
 174  * interrupt infrastructure will have to obtain and release the serializer
 175  * in their interrupt routine themselves.
 176  */
 177 struct ifnet {
 178         void    *if_softc;              /* pointer to driver state */
 179         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 180         char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
 181         const char *if_dname;           /* driver name */
 182         int     if_dunit;               /* unit or IF_DUNIT_NONE */
 183         void    *if_vlantrunks;         /* vlan trunks */
 184         struct  ifaddrhead *if_addrheads; /* linked lists of addresses per if */
 185         int     if_pcount;              /* number of promiscuous listeners */
 186         struct  carp_if *if_carp;       /* carp interface structure */
 187         struct  bpf_if *if_bpf;         /* packet filter structure */
 188         u_short if_index;               /* numeric abbreviation for this if  */
 189         short   if_timer;               /* time 'til if_watchdog called */
 190         int     if_flags;               /* up/down, broadcast, etc. */
 191         int     if_capabilities;        /* interface capabilities */
 192         int     if_capenable;           /* enabled features */
 193         void    *if_linkmib;            /* link-type-specific MIB data */
 194         size_t  if_linkmiblen;          /* length of above data */
 195         struct  if_data if_data;
 196         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 197         int     if_amcount;             /* number of all-multicast requests */
 198 /* procedure handles */
 199         int     (*if_output)            /* output routine (enqueue) */
 200                 (struct ifnet *, struct mbuf *, struct sockaddr *,
 201                      struct rtentry *);
 202         void    (*if_input)             /* input routine from hardware driver */
 203                 (struct ifnet *, struct mbuf *);
 204         void    (*if_start)             /* initiate output routine */
 205                 (struct ifnet *);
 206         int     (*if_ioctl)             /* ioctl routine */
 207                 (struct ifnet *, u_long, caddr_t, struct ucred *);
 208         void    (*if_watchdog)          /* timer routine */
 209                 (struct ifnet *);
 210         void    (*if_init)              /* Init routine */
 211                 (void *);
 212         int     (*if_resolvemulti)      /* validate/resolve multicast */
 213                 (struct ifnet *, struct sockaddr **, struct sockaddr *);
 214 #ifdef DEVICE_POLLING
 215         void    (*if_poll)              /* IFF_POLLING support */
 216                 (struct ifnet *, enum poll_cmd, int);
 217         int     if_poll_cpuid;
 218 #else
 219         /* Place holders */
 220         void    (*if_poll_unused)(void);
 221         int     if_poll_cpuid_used;
 222 #endif
 223         struct  ifaltq if_snd;          /* output queue (includes altq) */
 224         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 225         const uint8_t   *if_broadcastaddr;
 226         void    *if_bridge;             /* bridge glue */
 227         void    *if_afdata[AF_MAX];
 228         struct ifaddr   *if_lladdr;
 229         struct lwkt_serialize *if_serializer;   /* serializer or MP lock */
 230         struct lwkt_serialize if_default_serializer; /* if not supplied */
 231 };
 232 typedef void if_init_f_t (void *);
 233
 234 #define if_mtu          if_data.ifi_mtu
 235 #define if_type         if_data.ifi_type
 236 #define if_physical     if_data.ifi_physical
 237 #define if_addrlen      if_data.ifi_addrlen
 238 #define if_hdrlen       if_data.ifi_hdrlen
 239 #define if_metric       if_data.ifi_metric
 240 #define if_link_state   if_data.ifi_link_state
 241 #define if_baudrate     if_data.ifi_baudrate
 242 #define if_hwassist     if_data.ifi_hwassist
 243 #define if_ipackets     if_data.ifi_ipackets
 244 #define if_ierrors      if_data.ifi_ierrors
 245 #define if_opackets     if_data.ifi_opackets
 246 #define if_oerrors      if_data.ifi_oerrors
 247 #define if_collisions   if_data.ifi_collisions
 248 #define if_ibytes       if_data.ifi_ibytes
 249 #define if_obytes       if_data.ifi_obytes
 250 #define if_imcasts      if_data.ifi_imcasts
 251 #define if_omcasts      if_data.ifi_omcasts
 252 #define if_iqdrops      if_data.ifi_iqdrops
 253 #define if_noproto      if_data.ifi_noproto
 254 #define if_lastchange   if_data.ifi_lastchange
 255 #define if_recvquota    if_data.ifi_recvquota
 256 #define if_xmitquota    if_data.ifi_xmitquota
 257 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
 258
 259 /* for compatibility with other BSDs */
 260 #define if_list         if_link
 261
 262
 263 /*
 264  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 265  * are queues of messages stored on ifqueue structures
 266  * (defined above).  Entries are added to and deleted from these structures
 267  * by these macros, which should be called with ipl raised to splimp().
 268  */
 269 #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 270 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 271 #define IF_QLEN(ifq)            ((ifq)->ifq_len)
 272 #define IF_QEMPTY(ifq)          (IF_QLEN(ifq) == 0)
 273 #define IF_ENQUEUE(ifq, m) { \
 274         (m)->m_nextpkt = 0; \
 275         if ((ifq)->ifq_tail == 0) \
 276                 (ifq)->ifq_head = m; \
 277         else \
 278                 (ifq)->ifq_tail->m_nextpkt = m; \
 279         (ifq)->ifq_tail = m; \
 280         (ifq)->ifq_len++; \
 281 }
 282 #define IF_PREPEND(ifq, m) { \
 283         (m)->m_nextpkt = (ifq)->ifq_head; \
 284         if ((ifq)->ifq_tail == 0) \
 285                 (ifq)->ifq_tail = (m); \
 286         (ifq)->ifq_head = (m); \
 287         (ifq)->ifq_len++; \
 288 }
 289 #define IF_DEQUEUE(ifq, m) { \
 290         (m) = (ifq)->ifq_head; \
 291         if (m) { \
 292                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
 293                         (ifq)->ifq_tail = 0; \
 294                 (m)->m_nextpkt = 0; \
 295                 (ifq)->ifq_len--; \
 296         } \
 297 }
 298
 299 #define IF_POLL(ifq, m)         ((m) = (ifq)->ifq_head)
 300
 301 #define IF_DRAIN(ifq) do {                                              \
 302         struct mbuf *m;                                                 \
 303         while (1) {                                                     \
 304                 IF_DEQUEUE(ifq, m);                                     \
 305                 if (m == NULL)                                          \
 306                         break;                                          \
 307                 m_freem(m);                                             \
 308         }                                                               \
 309 } while (0)
 310
 311 #ifdef _KERNEL
 312
 313 /*
 314  * DEPRECATED - should not be used by any new driver.  This code uses the
 315  * old queueing interface and if_start ABI and does not use the ifp's
 316  * serializer.
 317  */
 318 #define IF_HANDOFF(ifq, m, ifp)                 if_handoff(ifq, m, ifp, 0)
 319 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj)        if_handoff(ifq, m, ifp, adj)
 320
 321 static __inline int
 322 if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp,
 323            int _adjust)
 324 {
 325         int _need_if_start = 0;
 326
 327         crit_enter();
 328
 329         if (IF_QFULL(_ifq)) {
 330                 IF_DROP(_ifq);
 331                 crit_exit();
 332                 m_freem(_m);
 333                 return (0);
 334         }
 335         if (_ifp != NULL) {
 336                 _ifp->if_obytes += _m->m_pkthdr.len + _adjust;
 337                 if (_m->m_flags & M_MCAST)
 338                         _ifp->if_omcasts++;
 339                 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE);
 340         }
 341         IF_ENQUEUE(_ifq, _m);
 342         if (_need_if_start) {
 343                 (*_ifp->if_start)(_ifp);
 344         }
 345         crit_exit();
 346         return (1);
 347 }
 348
 349 /*
 350  * 72 was chosen below because it is the size of a TCP/IP
 351  * header (40) + the minimum mss (32).
 352  */
 353 #define IF_MINMTU       72
 354 #define IF_MAXMTU       65535
 355
 356 #endif /* _KERNEL */
 357
 358 struct ifaddr_container {
 359 #define IFA_CONTAINER_MAGIC     0x19810219
 360 #define IFA_CONTAINER_DEAD      0xc0dedead
 361         uint32_t                ifa_magic;  /* IFA_CONTAINER_MAGIC */
 362         struct ifaddr           *ifa;
 363         TAILQ_ENTRY(ifaddr_container)   ifa_link;   /* queue macro glue */
 364         u_int                   ifa_refcnt; /* references to this structure */
 365 };
 366
 367 /*
 368  * The ifaddr structure contains information about one address
 369  * of an interface.  They are maintained by the different address families,
 370  * are allocated and attached when an address is set, and are linked
 371  * together so all addresses for an interface can be located.
 372  */
 373 struct ifaddr {
 374         struct  sockaddr *ifa_addr;     /* address of interface */
 375         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 376 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 377         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 378         struct  if_data if_data;        /* not all members are meaningful */
 379         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 380         void    *ifa_link_pad;
 381         struct ifaddr_container *ifa_containers;
 382         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 383                 (int, struct rtentry *, struct rt_addrinfo *);
 384         u_short ifa_flags;              /* mostly rt_flags for cloning */
 385         cpumask_t ifa_cpumask;
 386         int     ifa_metric;             /* cost of going out this interface */
 387 #ifdef notdef
 388         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 389 #endif
 390         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 391                 (struct ifaddr *, struct sockaddr *);
 392
 393 };
 394 #define IFA_ROUTE       RTF_UP          /* route installed */
 395
 396 /* for compatibility with other BSDs */
 397 #define ifa_list        ifa_link
 398
 399 /*
 400  * The prefix structure contains information about one prefix
 401  * of an interface.  They are maintained by the different address families,
 402  * are allocated and attached when an prefix or an address is set,
 403  * and are linked together so all prefixes for an interface can be located.
 404  */
 405 struct ifprefix {
 406         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 407         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 408         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 409         u_char  ifpr_plen;              /* prefix length in bits */
 410         u_char  ifpr_type;              /* protocol dependent prefix type */
 411 };
 412
 413 /*
 414  * Multicast address structure.  This is analogous to the ifaddr
 415  * structure except that it keeps track of multicast addresses.
 416  * Also, the reference count here is a count of requests for this
 417  * address, not a count of pointers to this structure.
 418  */
 419 struct ifmultiaddr {
 420         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 421         struct  sockaddr *ifma_addr;    /* address this membership is for */
 422         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 423         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 424         u_int   ifma_refcount;          /* reference count */
 425         void    *ifma_protospec;        /* protocol-specific state, if any */
 426 };
 427
 428 #ifdef _KERNEL
 429 /* interface address change event */
 430 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
 431 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
 432 /* new interface attach event */
 433 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
 434 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
 435 /* interface detach event */
 436 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
 437 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
 438
 439 static __inline void
 440 _IFAREF(struct ifaddr *_ifa, int _cpu_id)
 441 {
 442         struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
 443
 444         crit_enter();
 445         KKASSERT(_ifac->ifa_magic == IFA_CONTAINER_MAGIC);
 446         ++_ifac->ifa_refcnt;
 447         crit_exit();
 448 }
 449
 450 static __inline void
 451 IFAREF(struct ifaddr *_ifa)
 452 {
 453         _IFAREF(_ifa, mycpuid);
 454 }
 455
 456 #include <sys/malloc.h>
 457
 458 MALLOC_DECLARE(M_IFADDR);
 459 MALLOC_DECLARE(M_IFMADDR);
 460
 461 void    ifac_free(struct ifaddr_container *, int);
 462
 463 static __inline void
 464 _IFAFREE(struct ifaddr *_ifa, int _cpu_id)
 465 {
 466         struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
 467
 468         crit_enter();
 469         KKASSERT(_ifac->ifa_magic == IFA_CONTAINER_MAGIC);
 470         KKASSERT(_ifac->ifa_refcnt > 0);
 471         if (--_ifac->ifa_refcnt == 0)
 472                 ifac_free(_ifac, _cpu_id);
 473         crit_exit();
 474 }
 475
 476 static __inline void
 477 IFAFREE(struct ifaddr *_ifa)
 478 {
 479         _IFAFREE(_ifa, mycpuid);
 480 }
 481
 482 extern  struct ifnethead ifnet;
 483 extern struct   ifnet   **ifindex2ifnet;
 484 extern  int ifqmaxlen;
 485 extern  struct ifnet loif[];
 486 extern  int if_index;
 487
 488 void    ether_ifattach(struct ifnet *, uint8_t *, struct lwkt_serialize *);
 489 void    ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int,
 490                         struct lwkt_serialize *);
 491 void    ether_ifdetach(struct ifnet *);
 492 void    ether_input(struct ifnet *, struct mbuf *);
 493 void    ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
 494 int     ether_output_frame(struct ifnet *, struct mbuf *);
 495 int     ether_ioctl(struct ifnet *, int, caddr_t);
 496 uint32_t        ether_crc32_le(const uint8_t *, size_t);
 497 uint32_t        ether_crc32_be(const uint8_t *, size_t);
 498
 499 int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
 500 int     if_allmulti(struct ifnet *, int);
 501 void    if_attach(struct ifnet *, struct lwkt_serialize *);
 502 int     if_delmulti(struct ifnet *, struct sockaddr *);
 503 void    if_purgeaddrs_nolink(struct ifnet *);
 504 void    if_detach(struct ifnet *);
 505 void    if_down(struct ifnet *);
 506 void    if_link_state_change(struct ifnet *);
 507 void    if_initname(struct ifnet *, const char *, int);
 508 int     if_getanyethermac(uint16_t *, int);
 509 int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
 510 void    if_route(struct ifnet *, int flag, int fam);
 511 int     if_setlladdr(struct ifnet *, const u_char *, int);
 512 void    if_unroute(struct ifnet *, int flag, int fam);
 513 void    if_up(struct ifnet *);
 514 /*void  ifinit(void);*/ /* declared in systm.h for main() */
 515 int     ifioctl(struct socket *, u_long, caddr_t, struct ucred *);
 516 int     ifpromisc(struct ifnet *, int);
 517 struct  ifnet *ifunit(const char *);
 518 struct  ifnet *if_withname(struct sockaddr *);
 519
 520 struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
 521 struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
 522 struct  ifaddr *ifa_ifwithnet(struct sockaddr *);
 523 struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
 524 struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 525
 526 void    *ifa_create(int, int);
 527 void    ifa_destroy(struct ifaddr *);
 528 void    ifa_iflink(struct ifaddr *, struct ifnet *, int);
 529 void    ifa_ifunlink(struct ifaddr *, struct ifnet *);
 530 struct lwkt_port *ifa_portfn(int);
 531
 532 struct  ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 533 int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
 534
 535 #define IF_LLSOCKADDR(ifp)                                              \
 536     ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
 537 #define IF_LLADDR(ifp)  LLADDR(IF_LLSOCKADDR(ifp))
 538
 539 #ifdef DEVICE_POLLING
 540 typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count);
 541 int     ether_poll_register(struct ifnet *);
 542 int     ether_poll_deregister(struct ifnet *);
 543 int     ether_pollcpu_register(struct ifnet *, int);
 544 #endif /* DEVICE_POLLING */
 545 #endif /* _KERNEL */
 546
 547 #endif /* !_NET_IF_VAR_H_ */