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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
  30  * $FreeBSD$
  31  */
  32
  33 #ifndef _NET_IF_VAR_H_
  34 #define _NET_IF_VAR_H_
  35
  36 /*
  37  * Structures defining a network interface, providing a packet
  38  * transport mechanism (ala level 0 of the PUP protocols).
  39  *
  40  * Each interface accepts output datagrams of a specified maximum
  41  * length, and provides higher level routines with input datagrams
  42  * received from its medium.
  43  *
  44  * Output occurs when the routine if_output is called, with three parameters:
  45  *      (*ifp->if_output)(ifp, m, dst, rt)
  46  * Here m is the mbuf chain to be sent and dst is the destination address.
  47  * The output routine encapsulates the supplied datagram if necessary,
  48  * and then transmits it on its medium.
  49  *
  50  * On input, each interface unwraps the data received by it, and either
  51  * places it on the input queue of an internetwork datagram routine
  52  * and posts the associated software interrupt, or passes the datagram to a raw
  53  * packet input routine.
  54  *
  55  * Routines exist for locating interfaces by their addresses
  56  * or for locating an interface on a certain network, as well as more general
  57  * routing and gateway routines maintaining information used to locate
  58  * interfaces.  These routines live in the files if.c and route.c
  59  */
  60
  61 #ifdef __STDC__
  62 /*
  63  * Forward structure declarations for function prototypes [sic].
  64  */
  65 struct  mbuf;
  66 struct  thread;
  67 struct  rtentry;
  68 struct  rt_addrinfo;
  69 struct  socket;
  70 struct  ether_header;
  71 struct  carp_if;
  72 struct  carp_softc;
  73 struct  ifvlantrunk;
  74 struct  route;
  75 struct  vnet;
  76 #endif
  77
  78 #include <sys/queue.h>          /* get TAILQ macros */
  79
  80 #ifdef _KERNEL
  81 #include <sys/mbuf.h>
  82 #include <sys/eventhandler.h>
  83 #include <sys/buf_ring.h>
  84 #include <net/vnet.h>
  85 #endif /* _KERNEL */
  86 #include <sys/lock.h>           /* XXX */
  87 #include <sys/mutex.h>          /* XXX */
  88 #include <sys/rwlock.h>         /* XXX */
  89 #include <sys/sx.h>             /* XXX */
  90 #include <sys/event.h>          /* XXX */
  91 #include <sys/_task.h>
  92
  93 #define IF_DUNIT_NONE   -1
  94
  95 #include <altq/if_altq.h>
  96
  97 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
  98 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
  99 TAILQ_HEAD(ifmultihead, ifmultiaddr);
 100 TAILQ_HEAD(ifgrouphead, ifg_group);
 101
 102 #ifdef _KERNEL
 103 VNET_DECLARE(struct pfil_head, link_pfil_hook); /* packet filter hooks */
 104 #define V_link_pfil_hook        VNET(link_pfil_hook)
 105 #endif /* _KERNEL */
 106
 107 typedef enum {
 108         IFCOUNTER_IPACKETS = 0,
 109         IFCOUNTER_IERRORS,
 110         IFCOUNTER_OPACKETS,
 111         IFCOUNTER_OERRORS,
 112         IFCOUNTER_COLLISIONS,
 113         IFCOUNTER_IBYTES,
 114         IFCOUNTER_OBYTES,
 115         IFCOUNTER_IMCASTS,
 116         IFCOUNTER_OMCASTS,
 117         IFCOUNTER_IQDROPS,
 118         IFCOUNTER_OQDROPS,
 119         IFCOUNTER_NOPROTO,
 120         IFCOUNTERS /* Array size. */
 121 } ift_counter;
 122
 123 /*
 124  * Structure defining a queue for a network interface.
 125  */
 126 struct  ifqueue {
 127         struct  mbuf *ifq_head;
 128         struct  mbuf *ifq_tail;
 129         int     ifq_len;
 130         int     ifq_maxlen;
 131         int     ifq_drops;
 132         struct  mtx ifq_mtx;
 133 };
 134
 135 struct ifnet_hw_tsomax {
 136         u_int   tsomaxbytes;    /* TSO total burst length limit in bytes */
 137         u_int   tsomaxsegcount; /* TSO maximum segment count */
 138         u_int   tsomaxsegsize;  /* TSO maximum segment size in bytes */
 139 };
 140
 141 /*
 142  * Structure defining a network interface.
 143  *
 144  * (Would like to call this struct ``if'', but C isn't PL/1.)
 145  */
 146
 147 struct ifnet {
 148         void    *if_softc;              /* pointer to driver state */
 149         void    *if_l2com;              /* pointer to protocol bits */
 150         struct vnet *if_vnet;           /* pointer to network stack instance */
 151         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 152         char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
 153         const char *if_dname;           /* driver name */
 154         int     if_dunit;               /* unit or IF_DUNIT_NONE */
 155         u_int   if_refcount;            /* reference count */
 156         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
 157                 /*
 158                  * if_addrhead is the list of all addresses associated to
 159                  * an interface.
 160                  * Some code in the kernel assumes that first element
 161                  * of the list has type AF_LINK, and contains sockaddr_dl
 162                  * addresses which store the link-level address and the name
 163                  * of the interface.
 164                  * However, access to the AF_LINK address through this
 165                  * field is deprecated. Use if_addr or ifaddr_byindex() instead.
 166                  */
 167         int     if_pcount;              /* number of promiscuous listeners */
 168         struct  carp_if *if_carp;       /* carp interface structure */
 169         struct  bpf_if *if_bpf;         /* packet filter structure */
 170         u_short if_index;               /* numeric abbreviation for this if  */
 171         short   if_index_reserved;      /* spare space to grow if_index */
 172         struct  ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
 173         int     if_flags;               /* up/down, broadcast, etc. */
 174         int     if_capabilities;        /* interface features & capabilities */
 175         int     if_capenable;           /* enabled features & capabilities */
 176         void    *if_linkmib;            /* link-type-specific MIB data */
 177         size_t  if_linkmiblen;          /* length of above data */
 178         struct  if_data if_data;
 179         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 180         int     if_amcount;             /* number of all-multicast requests */
 181 /* procedure handles */
 182         int     (*if_output)            /* output routine (enqueue) */
 183                 (struct ifnet *, struct mbuf *, const struct sockaddr *,
 184                      struct route *);
 185         void    (*if_input)             /* input routine (from h/w driver) */
 186                 (struct ifnet *, struct mbuf *);
 187         void    (*if_start)             /* initiate output routine */
 188                 (struct ifnet *);
 189         int     (*if_ioctl)             /* ioctl routine */
 190                 (struct ifnet *, u_long, caddr_t);
 191         void    (*if_init)              /* Init routine */
 192                 (void *);
 193         int     (*if_resolvemulti)      /* validate/resolve multicast */
 194                 (struct ifnet *, struct sockaddr **, struct sockaddr *);
 195         void    (*if_qflush)            /* flush any queues */
 196                 (struct ifnet *);
 197         int     (*if_transmit)          /* initiate output routine */
 198                 (struct ifnet *, struct mbuf *);
 199         void    (*if_reassign)          /* reassign to vnet routine */
 200                 (struct ifnet *, struct vnet *, char *);
 201         struct  vnet *if_home_vnet;     /* where this ifnet originates from */
 202         struct  ifaddr  *if_addr;       /* pointer to link-level address */
 203         void    *if_llsoftc;            /* link layer softc */
 204         int     if_drv_flags;           /* driver-managed status flags */
 205         struct  ifaltq if_snd;          /* output queue (includes altq) */
 206         const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
 207
 208         void    *if_bridge;             /* bridge glue */
 209
 210         struct  label *if_label;        /* interface MAC label */
 211
 212         /* these are only used by IPv6 */
 213         void    *if_unused[2];
 214         void    *if_afdata[AF_MAX];
 215         int     if_afdata_initialized;
 216         struct  rwlock if_afdata_lock;
 217         struct  task if_linktask;       /* task for link change events */
 218         struct  rwlock if_addr_lock;    /* lock to protect address lists */
 219
 220         LIST_ENTRY(ifnet) if_clones;    /* interfaces of a cloner */
 221         TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
 222                                         /* protected by if_addr_lock */
 223         void    *if_pf_kif;
 224         void    *if_lagg;               /* lagg glue */
 225         char    *if_description;        /* interface description */
 226         u_int   if_fib;                 /* interface FIB */
 227         u_char  if_alloctype;           /* if_type at time of allocation */
 228
 229         /*
 230          * Network adapter TSO limits:
 231          * ===========================
 232          *
 233          * If the "if_hw_tsomax" field is zero the maximum segment
 234          * length limit does not apply. If the "if_hw_tsomaxsegcount"
 235          * or the "if_hw_tsomaxsegsize" field is zero the TSO segment
 236          * count limit does not apply. If all three fields are zero,
 237          * there is no TSO limit.
 238          *
 239          * NOTE: The TSO limits should reflect the values used in the
 240          * BUSDMA tag a network adapter is using to load a mbuf chain
 241          * for transmission. The TCP/IP network stack will subtract
 242          * space for all linklevel and protocol level headers and
 243          * ensure that the full mbuf chain passed to the network
 244          * adapter fits within the given limits.
 245          */
 246         u_int   if_hw_tsomax;
 247
 248         /*
 249          * Spare fields are added so that we can modify sensitive data
 250          * structures without changing the kernel binary interface, and must
 251          * be used with care where binary compatibility is required.
 252          */
 253         char    if_cspare[3];
 254         int     if_ispare[2];
 255
 256         /*
 257          * TSO fields for segment limits. If a field is zero below,
 258          * there is no limit:
 259          */
 260         u_int   if_hw_tsomaxsegcount;   /* TSO maximum segment count */
 261         u_int   if_hw_tsomaxsegsize;    /* TSO maximum segment size in bytes */
 262         void    *if_pspare[7];          /* 1 netmap, 6 TDB */
 263         void    *if_hw_addr;            /* hardware link-level address */
 264 };
 265
 266 typedef void if_init_f_t(void *);
 267
 268 /*
 269  * XXX These aliases are terribly dangerous because they could apply
 270  * to anything.
 271  */
 272 #define if_mtu          if_data.ifi_mtu
 273 #define if_type         if_data.ifi_type
 274 #define if_physical     if_data.ifi_physical
 275 #define if_addrlen      if_data.ifi_addrlen
 276 #define if_hdrlen       if_data.ifi_hdrlen
 277 #define if_metric       if_data.ifi_metric
 278 #define if_link_state   if_data.ifi_link_state
 279 #define if_baudrate     if_data.ifi_baudrate
 280 #define if_baudrate_pf  if_data.ifi_baudrate_pf
 281 #define if_hwassist     if_data.ifi_hwassist
 282 #define if_ipackets     if_data.ifi_ipackets
 283 #define if_ierrors      if_data.ifi_ierrors
 284 #define if_opackets     if_data.ifi_opackets
 285 #define if_oerrors      if_data.ifi_oerrors
 286 #define if_collisions   if_data.ifi_collisions
 287 #define if_ibytes       if_data.ifi_ibytes
 288 #define if_obytes       if_data.ifi_obytes
 289 #define if_imcasts      if_data.ifi_imcasts
 290 #define if_omcasts      if_data.ifi_omcasts
 291 #define if_iqdrops      if_data.ifi_iqdrops
 292 #define if_noproto      if_data.ifi_noproto
 293 #define if_lastchange   if_data.ifi_lastchange
 294
 295 /* for compatibility with other BSDs */
 296 #define if_addrlist     if_addrhead
 297 #define if_list         if_link
 298 #define if_name(ifp)    ((ifp)->if_xname)
 299
 300 /*
 301  * Locks for address lists on the network interface.
 302  */
 303 #define IF_ADDR_LOCK_INIT(if)   rw_init(&(if)->if_addr_lock, "if_addr_lock")
 304 #define IF_ADDR_LOCK_DESTROY(if)        rw_destroy(&(if)->if_addr_lock)
 305 #define IF_ADDR_WLOCK(if)       rw_wlock(&(if)->if_addr_lock)
 306 #define IF_ADDR_WUNLOCK(if)     rw_wunlock(&(if)->if_addr_lock)
 307 #define IF_ADDR_RLOCK(if)       rw_rlock(&(if)->if_addr_lock)
 308 #define IF_ADDR_RUNLOCK(if)     rw_runlock(&(if)->if_addr_lock)
 309 #define IF_ADDR_LOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_LOCKED)
 310 #define IF_ADDR_WLOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_WLOCKED)
 311
 312 /*
 313  * Function variations on locking macros intended to be used by loadable
 314  * kernel modules in order to divorce them from the internals of address list
 315  * locking.
 316  */
 317 void    if_addr_rlock(struct ifnet *ifp);       /* if_addrhead */
 318 void    if_addr_runlock(struct ifnet *ifp);     /* if_addrhead */
 319 void    if_maddr_rlock(struct ifnet *ifp);      /* if_multiaddrs */
 320 void    if_maddr_runlock(struct ifnet *ifp);    /* if_multiaddrs */
 321
 322 /*
 323  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 324  * are queues of messages stored on ifqueue structures
 325  * (defined above).  Entries are added to and deleted from these structures
 326  * by these macros.
 327  */
 328 #define IF_LOCK(ifq)            mtx_lock(&(ifq)->ifq_mtx)
 329 #define IF_UNLOCK(ifq)          mtx_unlock(&(ifq)->ifq_mtx)
 330 #define IF_LOCK_ASSERT(ifq)     mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
 331 #define _IF_QFULL(ifq)          ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 332 #define _IF_DROP(ifq)           ((ifq)->ifq_drops++)
 333 #define _IF_QLEN(ifq)           ((ifq)->ifq_len)
 334
 335 #define _IF_ENQUEUE(ifq, m) do {                                \
 336         (m)->m_nextpkt = NULL;                                  \
 337         if ((ifq)->ifq_tail == NULL)                            \
 338                 (ifq)->ifq_head = m;                            \
 339         else                                                    \
 340                 (ifq)->ifq_tail->m_nextpkt = m;                 \
 341         (ifq)->ifq_tail = m;                                    \
 342         (ifq)->ifq_len++;                                       \
 343 } while (0)
 344
 345 #define IF_ENQUEUE(ifq, m) do {                                 \
 346         IF_LOCK(ifq);                                           \
 347         _IF_ENQUEUE(ifq, m);                                    \
 348         IF_UNLOCK(ifq);                                         \
 349 } while (0)
 350
 351 #define _IF_PREPEND(ifq, m) do {                                \
 352         (m)->m_nextpkt = (ifq)->ifq_head;                       \
 353         if ((ifq)->ifq_tail == NULL)                            \
 354                 (ifq)->ifq_tail = (m);                          \
 355         (ifq)->ifq_head = (m);                                  \
 356         (ifq)->ifq_len++;                                       \
 357 } while (0)
 358
 359 #define IF_PREPEND(ifq, m) do {                                 \
 360         IF_LOCK(ifq);                                           \
 361         _IF_PREPEND(ifq, m);                                    \
 362         IF_UNLOCK(ifq);                                         \
 363 } while (0)
 364
 365 #define _IF_DEQUEUE(ifq, m) do {                                \
 366         (m) = (ifq)->ifq_head;                                  \
 367         if (m) {                                                \
 368                 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
 369                         (ifq)->ifq_tail = NULL;                 \
 370                 (m)->m_nextpkt = NULL;                          \
 371                 (ifq)->ifq_len--;                               \
 372         }                                                       \
 373 } while (0)
 374
 375 #define IF_DEQUEUE(ifq, m) do {                                 \
 376         IF_LOCK(ifq);                                           \
 377         _IF_DEQUEUE(ifq, m);                                    \
 378         IF_UNLOCK(ifq);                                         \
 379 } while (0)
 380
 381 #define _IF_DEQUEUE_ALL(ifq, m) do {                            \
 382         (m) = (ifq)->ifq_head;                                  \
 383         (ifq)->ifq_head = (ifq)->ifq_tail = NULL;               \
 384         (ifq)->ifq_len = 0;                                     \
 385 } while (0)
 386
 387 #define IF_DEQUEUE_ALL(ifq, m) do {                             \
 388         IF_LOCK(ifq);                                           \
 389         _IF_DEQUEUE_ALL(ifq, m);                                \
 390         IF_UNLOCK(ifq);                                         \
 391 } while (0)
 392
 393 #define _IF_POLL(ifq, m)        ((m) = (ifq)->ifq_head)
 394 #define IF_POLL(ifq, m)         _IF_POLL(ifq, m)
 395
 396 #define _IF_DRAIN(ifq) do {                                     \
 397         struct mbuf *m;                                         \
 398         for (;;) {                                              \
 399                 _IF_DEQUEUE(ifq, m);                            \
 400                 if (m == NULL)                                  \
 401                         break;                                  \
 402                 m_freem(m);                                     \
 403         }                                                       \
 404 } while (0)
 405
 406 #define IF_DRAIN(ifq) do {                                      \
 407         IF_LOCK(ifq);                                           \
 408         _IF_DRAIN(ifq);                                         \
 409         IF_UNLOCK(ifq);                                         \
 410 } while(0)
 411
 412 #ifdef _KERNEL
 413 /* interface link layer address change event */
 414 typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *);
 415 EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t);
 416 /* interface address change event */
 417 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
 418 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
 419 /* new interface arrival event */
 420 typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
 421 EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
 422 /* interface departure event */
 423 typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
 424 EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
 425 /* Interface link state change event */
 426 typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int);
 427 EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t);
 428 /* Interface up/down event */
 429 #define IFNET_EVENT_UP          0
 430 #define IFNET_EVENT_DOWN        1
 431 typedef void (*ifnet_event_fn)(void *, struct ifnet *ifp, int event);
 432 EVENTHANDLER_DECLARE(ifnet_event, ifnet_event_fn);
 433
 434 /*
 435  * interface groups
 436  */
 437 struct ifg_group {
 438         char                             ifg_group[IFNAMSIZ];
 439         u_int                            ifg_refcnt;
 440         void                            *ifg_pf_kif;
 441         TAILQ_HEAD(, ifg_member)         ifg_members;
 442         TAILQ_ENTRY(ifg_group)           ifg_next;
 443 };
 444
 445 struct ifg_member {
 446         TAILQ_ENTRY(ifg_member)  ifgm_next;
 447         struct ifnet            *ifgm_ifp;
 448 };
 449
 450 struct ifg_list {
 451         struct ifg_group        *ifgl_group;
 452         TAILQ_ENTRY(ifg_list)    ifgl_next;
 453 };
 454
 455 /* group attach event */
 456 typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
 457 EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
 458 /* group detach event */
 459 typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
 460 EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
 461 /* group change event */
 462 typedef void (*group_change_event_handler_t)(void *, const char *);
 463 EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
 464
 465 #define IF_AFDATA_LOCK_INIT(ifp)        \
 466         rw_init(&(ifp)->if_afdata_lock, "if_afdata")
 467
 468 #define IF_AFDATA_WLOCK(ifp)    rw_wlock(&(ifp)->if_afdata_lock)
 469 #define IF_AFDATA_RLOCK(ifp)    rw_rlock(&(ifp)->if_afdata_lock)
 470 #define IF_AFDATA_WUNLOCK(ifp)  rw_wunlock(&(ifp)->if_afdata_lock)
 471 #define IF_AFDATA_RUNLOCK(ifp)  rw_runlock(&(ifp)->if_afdata_lock)
 472 #define IF_AFDATA_LOCK(ifp)     IF_AFDATA_WLOCK(ifp)
 473 #define IF_AFDATA_UNLOCK(ifp)   IF_AFDATA_WUNLOCK(ifp)
 474 #define IF_AFDATA_TRYLOCK(ifp)  rw_try_wlock(&(ifp)->if_afdata_lock)
 475 #define IF_AFDATA_DESTROY(ifp)  rw_destroy(&(ifp)->if_afdata_lock)
 476
 477 #define IF_AFDATA_LOCK_ASSERT(ifp)      rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED)
 478 #define IF_AFDATA_RLOCK_ASSERT(ifp)     rw_assert(&(ifp)->if_afdata_lock, RA_RLOCKED)
 479 #define IF_AFDATA_WLOCK_ASSERT(ifp)     rw_assert(&(ifp)->if_afdata_lock, RA_WLOCKED)
 480 #define IF_AFDATA_UNLOCK_ASSERT(ifp)    rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED)
 481
 482 int     if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
 483             int adjust);
 484 #define IF_HANDOFF(ifq, m, ifp)                 \
 485         if_handoff((struct ifqueue *)ifq, m, ifp, 0)
 486 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj)        \
 487         if_handoff((struct ifqueue *)ifq, m, ifp, adj)
 488
 489 void    if_start(struct ifnet *);
 490
 491 #define IFQ_ENQUEUE(ifq, m, err)                                        \
 492 do {                                                                    \
 493         IF_LOCK(ifq);                                                   \
 494         if (ALTQ_IS_ENABLED(ifq))                                       \
 495                 ALTQ_ENQUEUE(ifq, m, NULL, err);                        \
 496         else {                                                          \
 497                 if (_IF_QFULL(ifq)) {                                   \
 498                         m_freem(m);                                     \
 499                         (err) = ENOBUFS;                                \
 500                 } else {                                                \
 501                         _IF_ENQUEUE(ifq, m);                            \
 502                         (err) = 0;                                      \
 503                 }                                                       \
 504         }                                                               \
 505         if (err)                                                        \
 506                 (ifq)->ifq_drops++;                                     \
 507         IF_UNLOCK(ifq);                                                 \
 508 } while (0)
 509
 510 #define IFQ_DEQUEUE_NOLOCK(ifq, m)                                      \
 511 do {                                                                    \
 512         if (TBR_IS_ENABLED(ifq))                                        \
 513                 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE);               \
 514         else if (ALTQ_IS_ENABLED(ifq))                                  \
 515                 ALTQ_DEQUEUE(ifq, m);                                   \
 516         else                                                            \
 517                 _IF_DEQUEUE(ifq, m);                                    \
 518 } while (0)
 519
 520 #define IFQ_DEQUEUE(ifq, m)                                             \
 521 do {                                                                    \
 522         IF_LOCK(ifq);                                                   \
 523         IFQ_DEQUEUE_NOLOCK(ifq, m);                                     \
 524         IF_UNLOCK(ifq);                                                 \
 525 } while (0)
 526
 527 #define IFQ_POLL_NOLOCK(ifq, m)                                         \
 528 do {                                                                    \
 529         if (TBR_IS_ENABLED(ifq))                                        \
 530                 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL);                 \
 531         else if (ALTQ_IS_ENABLED(ifq))                                  \
 532                 ALTQ_POLL(ifq, m);                                      \
 533         else                                                            \
 534                 _IF_POLL(ifq, m);                                       \
 535 } while (0)
 536
 537 #define IFQ_POLL(ifq, m)                                                \
 538 do {                                                                    \
 539         IF_LOCK(ifq);                                                   \
 540         IFQ_POLL_NOLOCK(ifq, m);                                        \
 541         IF_UNLOCK(ifq);                                                 \
 542 } while (0)
 543
 544 #define IFQ_PURGE_NOLOCK(ifq)                                           \
 545 do {                                                                    \
 546         if (ALTQ_IS_ENABLED(ifq)) {                                     \
 547                 ALTQ_PURGE(ifq);                                        \
 548         } else                                                          \
 549                 _IF_DRAIN(ifq);                                         \
 550 } while (0)
 551
 552 #define IFQ_PURGE(ifq)                                                  \
 553 do {                                                                    \
 554         IF_LOCK(ifq);                                                   \
 555         IFQ_PURGE_NOLOCK(ifq);                                          \
 556         IF_UNLOCK(ifq);                                                 \
 557 } while (0)
 558
 559 #define IFQ_SET_READY(ifq)                                              \
 560         do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
 561
 562 #define IFQ_LOCK(ifq)                   IF_LOCK(ifq)
 563 #define IFQ_UNLOCK(ifq)                 IF_UNLOCK(ifq)
 564 #define IFQ_LOCK_ASSERT(ifq)            IF_LOCK_ASSERT(ifq)
 565 #define IFQ_IS_EMPTY(ifq)               ((ifq)->ifq_len == 0)
 566 #define IFQ_INC_LEN(ifq)                ((ifq)->ifq_len++)
 567 #define IFQ_DEC_LEN(ifq)                (--(ifq)->ifq_len)
 568 #define IFQ_INC_DROPS(ifq)              ((ifq)->ifq_drops++)
 569 #define IFQ_SET_MAXLEN(ifq, len)        ((ifq)->ifq_maxlen = (len))
 570
 571 /*
 572  * The IFF_DRV_OACTIVE test should really occur in the device driver, not in
 573  * the handoff logic, as that flag is locked by the device driver.
 574  */
 575 #define IFQ_HANDOFF_ADJ(ifp, m, adj, err)                               \
 576 do {                                                                    \
 577         int len;                                                        \
 578         short mflags;                                                   \
 579                                                                         \
 580         len = (m)->m_pkthdr.len;                                        \
 581         mflags = (m)->m_flags;                                          \
 582         IFQ_ENQUEUE(&(ifp)->if_snd, m, err);                            \
 583         if ((err) == 0) {                                               \
 584                 (ifp)->if_obytes += len + (adj);                        \
 585                 if (mflags & M_MCAST)                                   \
 586                         (ifp)->if_omcasts++;                            \
 587                 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0)       \
 588                         if_start(ifp);                                  \
 589         }                                                               \
 590 } while (0)
 591
 592 #define IFQ_HANDOFF(ifp, m, err)                                        \
 593         IFQ_HANDOFF_ADJ(ifp, m, 0, err)
 594
 595 #define IFQ_DRV_DEQUEUE(ifq, m)                                         \
 596 do {                                                                    \
 597         (m) = (ifq)->ifq_drv_head;                                      \
 598         if (m) {                                                        \
 599                 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL)     \
 600                         (ifq)->ifq_drv_tail = NULL;                     \
 601                 (m)->m_nextpkt = NULL;                                  \
 602                 (ifq)->ifq_drv_len--;                                   \
 603         } else {                                                        \
 604                 IFQ_LOCK(ifq);                                          \
 605                 IFQ_DEQUEUE_NOLOCK(ifq, m);                             \
 606                 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) {    \
 607                         struct mbuf *m0;                                \
 608                         IFQ_DEQUEUE_NOLOCK(ifq, m0);                    \
 609                         if (m0 == NULL)                                 \
 610                                 break;                                  \
 611                         m0->m_nextpkt = NULL;                           \
 612                         if ((ifq)->ifq_drv_tail == NULL)                \
 613                                 (ifq)->ifq_drv_head = m0;               \
 614                         else                                            \
 615                                 (ifq)->ifq_drv_tail->m_nextpkt = m0;    \
 616                         (ifq)->ifq_drv_tail = m0;                       \
 617                         (ifq)->ifq_drv_len++;                           \
 618                 }                                                       \
 619                 IFQ_UNLOCK(ifq);                                        \
 620         }                                                               \
 621 } while (0)
 622
 623 #define IFQ_DRV_PREPEND(ifq, m)                                         \
 624 do {                                                                    \
 625         (m)->m_nextpkt = (ifq)->ifq_drv_head;                           \
 626         if ((ifq)->ifq_drv_tail == NULL)                                \
 627                 (ifq)->ifq_drv_tail = (m);                              \
 628         (ifq)->ifq_drv_head = (m);                                      \
 629         (ifq)->ifq_drv_len++;                                           \
 630 } while (0)
 631
 632 #define IFQ_DRV_IS_EMPTY(ifq)                                           \
 633         (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
 634
 635 #define IFQ_DRV_PURGE(ifq)                                              \
 636 do {                                                                    \
 637         struct mbuf *m, *n = (ifq)->ifq_drv_head;                       \
 638         while((m = n) != NULL) {                                        \
 639                 n = m->m_nextpkt;                                       \
 640                 m_freem(m);                                             \
 641         }                                                               \
 642         (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL;               \
 643         (ifq)->ifq_drv_len = 0;                                         \
 644         IFQ_PURGE(ifq);                                                 \
 645 } while (0)
 646
 647 #ifdef _KERNEL
 648 static __inline void
 649 if_initbaudrate(struct ifnet *ifp, uintmax_t baud)
 650 {
 651
 652         ifp->if_baudrate_pf = 0;
 653         while (baud > (u_long)(~0UL)) {
 654                 baud /= 10;
 655                 ifp->if_baudrate_pf++;
 656         }
 657         ifp->if_baudrate = baud;
 658 }
 659
 660 static __inline int
 661 drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m)
 662 {
 663         int error = 0;
 664
 665 #ifdef ALTQ
 666         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 667                 IFQ_ENQUEUE(&ifp->if_snd, m, error);
 668                 return (error);
 669         }
 670 #endif
 671         error = buf_ring_enqueue(br, m);
 672         if (error)
 673                 m_freem(m);
 674
 675         return (error);
 676 }
 677
 678 static __inline void
 679 drbr_putback(struct ifnet *ifp, struct buf_ring *br, struct mbuf *new)
 680 {
 681         /*
 682          * The top of the list needs to be swapped
 683          * for this one.
 684          */
 685 #ifdef ALTQ
 686         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
 687                 /*
 688                  * Peek in altq case dequeued it
 689                  * so put it back.
 690                  */
 691                 IFQ_DRV_PREPEND(&ifp->if_snd, new);
 692                 return;
 693         }
 694 #endif
 695         buf_ring_putback_sc(br, new);
 696 }
 697
 698 static __inline struct mbuf *
 699 drbr_peek(struct ifnet *ifp, struct buf_ring *br)
 700 {
 701 #ifdef ALTQ
 702         struct mbuf *m;
 703         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
 704                 /*
 705                  * Pull it off like a dequeue
 706                  * since drbr_advance() does nothing
 707                  * for altq and drbr_putback() will
 708                  * use the old prepend function.
 709                  */
 710                 IFQ_DEQUEUE(&ifp->if_snd, m);
 711                 return (m);
 712         }
 713 #endif
 714         return(buf_ring_peek_clear_sc(br));
 715 }
 716
 717 static __inline void
 718 drbr_flush(struct ifnet *ifp, struct buf_ring *br)
 719 {
 720         struct mbuf *m;
 721
 722 #ifdef ALTQ
 723         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
 724                 IFQ_PURGE(&ifp->if_snd);
 725 #endif
 726         while ((m = buf_ring_dequeue_sc(br)) != NULL)
 727                 m_freem(m);
 728 }
 729
 730 static __inline void
 731 drbr_free(struct buf_ring *br, struct malloc_type *type)
 732 {
 733
 734         drbr_flush(NULL, br);
 735         buf_ring_free(br, type);
 736 }
 737
 738 static __inline struct mbuf *
 739 drbr_dequeue(struct ifnet *ifp, struct buf_ring *br)
 740 {
 741 #ifdef ALTQ
 742         struct mbuf *m;
 743
 744         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) {
 745                 IFQ_DEQUEUE(&ifp->if_snd, m);
 746                 return (m);
 747         }
 748 #endif
 749         return (buf_ring_dequeue_sc(br));
 750 }
 751
 752 static __inline void
 753 drbr_advance(struct ifnet *ifp, struct buf_ring *br)
 754 {
 755 #ifdef ALTQ
 756         /* Nothing to do here since peek dequeues in altq case */
 757         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
 758                 return;
 759 #endif
 760         return (buf_ring_advance_sc(br));
 761 }
 762
 763
 764 static __inline struct mbuf *
 765 drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br,
 766     int (*func) (struct mbuf *, void *), void *arg)
 767 {
 768         struct mbuf *m;
 769 #ifdef ALTQ
 770         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 771                 IFQ_LOCK(&ifp->if_snd);
 772                 IFQ_POLL_NOLOCK(&ifp->if_snd, m);
 773                 if (m != NULL && func(m, arg) == 0) {
 774                         IFQ_UNLOCK(&ifp->if_snd);
 775                         return (NULL);
 776                 }
 777                 IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m);
 778                 IFQ_UNLOCK(&ifp->if_snd);
 779                 return (m);
 780         }
 781 #endif
 782         m = buf_ring_peek(br);
 783         if (m == NULL || func(m, arg) == 0)
 784                 return (NULL);
 785
 786         return (buf_ring_dequeue_sc(br));
 787 }
 788
 789 static __inline int
 790 drbr_empty(struct ifnet *ifp, struct buf_ring *br)
 791 {
 792 #ifdef ALTQ
 793         if (ALTQ_IS_ENABLED(&ifp->if_snd))
 794                 return (IFQ_IS_EMPTY(&ifp->if_snd));
 795 #endif
 796         return (buf_ring_empty(br));
 797 }
 798
 799 static __inline int
 800 drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br)
 801 {
 802 #ifdef ALTQ
 803         if (ALTQ_IS_ENABLED(&ifp->if_snd))
 804                 return (1);
 805 #endif
 806         return (!buf_ring_empty(br));
 807 }
 808
 809 static __inline int
 810 drbr_inuse(struct ifnet *ifp, struct buf_ring *br)
 811 {
 812 #ifdef ALTQ
 813         if (ALTQ_IS_ENABLED(&ifp->if_snd))
 814                 return (ifp->if_snd.ifq_len);
 815 #endif
 816         return (buf_ring_count(br));
 817 }
 818 #endif
 819 /*
 820  * 72 was chosen below because it is the size of a TCP/IP
 821  * header (40) + the minimum mss (32).
 822  */
 823 #define IF_MINMTU       72
 824 #define IF_MAXMTU       65535
 825
 826 #define TOEDEV(ifp)     ((ifp)->if_llsoftc)
 827
 828 #endif /* _KERNEL */
 829
 830 /*
 831  * The ifaddr structure contains information about one address
 832  * of an interface.  They are maintained by the different address families,
 833  * are allocated and attached when an address is set, and are linked
 834  * together so all addresses for an interface can be located.
 835  *
 836  * NOTE: a 'struct ifaddr' is always at the beginning of a larger
 837  * chunk of malloc'ed memory, where we store the three addresses
 838  * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
 839  */
 840 struct ifaddr {
 841         struct  sockaddr *ifa_addr;     /* address of interface */
 842         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 843 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 844         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 845         struct  if_data if_data;        /* not all members are meaningful */
 846         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 847         struct  carp_softc *ifa_carp;   /* pointer to CARP data */
 848         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
 849         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 850                 (int, struct rtentry *, struct rt_addrinfo *);
 851         u_short ifa_flags;              /* mostly rt_flags for cloning */
 852         u_int   ifa_refcnt;             /* references to this structure */
 853         int     ifa_metric;             /* cost of going out this interface */
 854         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 855                 (struct ifaddr *, struct sockaddr *);
 856         struct mtx ifa_mtx;
 857 };
 858 #define IFA_ROUTE       RTF_UP          /* route installed */
 859 #define IFA_RTSELF      RTF_HOST        /* loopback route to self installed */
 860
 861 /* for compatibility with other BSDs */
 862 #define ifa_list        ifa_link
 863
 864 #ifdef _KERNEL
 865 #define IFA_LOCK(ifa)           mtx_lock(&(ifa)->ifa_mtx)
 866 #define IFA_UNLOCK(ifa)         mtx_unlock(&(ifa)->ifa_mtx)
 867
 868 void    ifa_free(struct ifaddr *ifa);
 869 void    ifa_init(struct ifaddr *ifa);
 870 void    ifa_ref(struct ifaddr *ifa);
 871 #endif
 872
 873 /*
 874  * Multicast address structure.  This is analogous to the ifaddr
 875  * structure except that it keeps track of multicast addresses.
 876  */
 877 struct ifmultiaddr {
 878         TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 879         struct  sockaddr *ifma_addr;    /* address this membership is for */
 880         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 881         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 882         u_int   ifma_refcount;          /* reference count */
 883         void    *ifma_protospec;        /* protocol-specific state, if any */
 884         struct  ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
 885 };
 886
 887 #ifdef _KERNEL
 888
 889 extern  struct rwlock ifnet_rwlock;
 890 extern  struct sx ifnet_sxlock;
 891
 892 #define IFNET_LOCK_INIT() do {                                          \
 893         rw_init_flags(&ifnet_rwlock, "ifnet_rw",  RW_RECURSE);          \
 894         sx_init_flags(&ifnet_sxlock, "ifnet_sx",  SX_RECURSE);          \
 895 } while(0)
 896
 897 #define IFNET_WLOCK() do {                                              \
 898         sx_xlock(&ifnet_sxlock);                                        \
 899         rw_wlock(&ifnet_rwlock);                                        \
 900 } while (0)
 901
 902 #define IFNET_WUNLOCK() do {                                            \
 903         rw_wunlock(&ifnet_rwlock);                                      \
 904         sx_xunlock(&ifnet_sxlock);                                      \
 905 } while (0)
 906
 907 /*
 908  * To assert the ifnet lock, you must know not only whether it's for read or
 909  * write, but also whether it was acquired with sleep support or not.
 910  */
 911 #define IFNET_RLOCK_ASSERT()            sx_assert(&ifnet_sxlock, SA_SLOCKED)
 912 #define IFNET_RLOCK_NOSLEEP_ASSERT()    rw_assert(&ifnet_rwlock, RA_RLOCKED)
 913 #define IFNET_WLOCK_ASSERT() do {                                       \
 914         sx_assert(&ifnet_sxlock, SA_XLOCKED);                           \
 915         rw_assert(&ifnet_rwlock, RA_WLOCKED);                           \
 916 } while (0)
 917
 918 #define IFNET_RLOCK()           sx_slock(&ifnet_sxlock)
 919 #define IFNET_RLOCK_NOSLEEP()   rw_rlock(&ifnet_rwlock)
 920 #define IFNET_RUNLOCK()         sx_sunlock(&ifnet_sxlock)
 921 #define IFNET_RUNLOCK_NOSLEEP() rw_runlock(&ifnet_rwlock)
 922
 923 /*
 924  * Look up an ifnet given its index; the _ref variant also acquires a
 925  * reference that must be freed using if_rele().  It is almost always a bug
 926  * to call ifnet_byindex() instead if ifnet_byindex_ref().
 927  */
 928 struct ifnet    *ifnet_byindex(u_short idx);
 929 struct ifnet    *ifnet_byindex_locked(u_short idx);
 930 struct ifnet    *ifnet_byindex_ref(u_short idx);
 931
 932 /*
 933  * Given the index, ifaddr_byindex() returns the one and only
 934  * link-level ifaddr for the interface. You are not supposed to use
 935  * it to traverse the list of addresses associated to the interface.
 936  */
 937 struct ifaddr   *ifaddr_byindex(u_short idx);
 938
 939 VNET_DECLARE(struct ifnethead, ifnet);
 940 VNET_DECLARE(struct ifgrouphead, ifg_head);
 941 VNET_DECLARE(int, if_index);
 942 VNET_DECLARE(struct ifnet *, loif);     /* first loopback interface */
 943 VNET_DECLARE(int, useloopback);
 944
 945 #define V_ifnet         VNET(ifnet)
 946 #define V_ifg_head      VNET(ifg_head)
 947 #define V_if_index      VNET(if_index)
 948 #define V_loif          VNET(loif)
 949 #define V_useloopback   VNET(useloopback)
 950
 951 extern  int ifqmaxlen;
 952
 953 int     if_addgroup(struct ifnet *, const char *);
 954 int     if_delgroup(struct ifnet *, const char *);
 955 int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
 956 int     if_allmulti(struct ifnet *, int);
 957 struct  ifnet* if_alloc(u_char);
 958 void    if_attach(struct ifnet *);
 959 void    if_dead(struct ifnet *);
 960 int     if_delmulti(struct ifnet *, struct sockaddr *);
 961 void    if_delmulti_ifma(struct ifmultiaddr *);
 962 void    if_detach(struct ifnet *);
 963 void    if_vmove(struct ifnet *, struct vnet *);
 964 void    if_purgeaddrs(struct ifnet *);
 965 void    if_delallmulti(struct ifnet *);
 966 void    if_down(struct ifnet *);
 967 struct ifmultiaddr *
 968         if_findmulti(struct ifnet *, struct sockaddr *);
 969 void    if_free(struct ifnet *);
 970 void    if_initname(struct ifnet *, const char *, int);
 971 void    if_link_state_change(struct ifnet *, int);
 972 int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
 973 void    if_qflush(struct ifnet *);
 974 void    if_ref(struct ifnet *);
 975 void    if_rele(struct ifnet *);
 976 int     if_setlladdr(struct ifnet *, const u_char *, int);
 977 int     if_gethwaddr(struct ifnet *, struct ifreq *);
 978 void    if_up(struct ifnet *);
 979 int     ifioctl(struct socket *, u_long, caddr_t, struct thread *);
 980 int     ifpromisc(struct ifnet *, int);
 981 struct  ifnet *ifunit(const char *);
 982 struct  ifnet *ifunit_ref(const char *);
 983
 984 void    ifq_init(struct ifaltq *, struct ifnet *ifp);
 985 void    ifq_delete(struct ifaltq *);
 986
 987 int     ifa_add_loopback_route(struct ifaddr *, struct sockaddr *);
 988 int     ifa_del_loopback_route(struct ifaddr *, struct sockaddr *);
 989
 990 struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
 991 int             ifa_ifwithaddr_check(struct sockaddr *);
 992 struct  ifaddr *ifa_ifwithbroadaddr(struct sockaddr *);
 993 struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
 994 struct  ifaddr *ifa_ifwithdstaddr_fib(struct sockaddr *, int);
 995 struct  ifaddr *ifa_ifwithnet(struct sockaddr *, int);
 996 struct  ifaddr *ifa_ifwithnet_fib(struct sockaddr *, int, int);
 997 struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
 998 struct  ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int);
 999 struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
1000 int     ifa_preferred(struct ifaddr *, struct ifaddr *);
1001
1002 int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
1003
1004 typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
1005 typedef void if_com_free_t(void *com, u_char type);
1006 void    if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
1007 void    if_deregister_com_alloc(u_char type);
1008 uint64_t if_get_counter_default(struct ifnet *, ift_counter);
1009 void    if_inc_counter(struct ifnet *, ift_counter, int64_t);
1010
1011 #define IF_LLADDR(ifp)                                                  \
1012     LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
1013
1014 #ifdef DEVICE_POLLING
1015 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
1016
1017 typedef int poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
1018 int    ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
1019 int    ether_poll_deregister(struct ifnet *ifp);
1020 #endif /* DEVICE_POLLING */
1021
1022 /* TSO */
1023 void if_hw_tsomax_common(struct ifnet *, struct ifnet_hw_tsomax *);
1024 int if_hw_tsomax_update(struct ifnet *, struct ifnet_hw_tsomax *);
1025
1026 #endif /* _KERNEL */
1027
1028 #endif /* !_NET_IF_VAR_H_ */