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 /*
 103  * Structure defining a queue for a network interface.
 104  */
 105 struct  ifqueue {
 106         struct  mbuf *ifq_head;
 107         struct  mbuf *ifq_tail;
 108         int     ifq_len;
 109         int     ifq_maxlen;
 110         int     ifq_drops;
 111         struct  mtx ifq_mtx;
 112 };
 113
 114 /*
 115  * Structure defining a network interface.
 116  *
 117  * (Would like to call this struct ``if'', but C isn't PL/1.)
 118  */
 119
 120 struct ifnet {
 121         void    *if_softc;              /* pointer to driver state */
 122         void    *if_l2com;              /* pointer to protocol bits */
 123         struct vnet *if_vnet;           /* pointer to network stack instance */
 124         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 125         char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
 126         const char *if_dname;           /* driver name */
 127         int     if_dunit;               /* unit or IF_DUNIT_NONE */
 128         u_int   if_refcount;            /* reference count */
 129         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
 130                 /*
 131                  * if_addrhead is the list of all addresses associated to
 132                  * an interface.
 133                  * Some code in the kernel assumes that first element
 134                  * of the list has type AF_LINK, and contains sockaddr_dl
 135                  * addresses which store the link-level address and the name
 136                  * of the interface.
 137                  * However, access to the AF_LINK address through this
 138                  * field is deprecated. Use if_addr or ifaddr_byindex() instead.
 139                  */
 140         int     if_pcount;              /* number of promiscuous listeners */
 141         struct  carp_if *if_carp;       /* carp interface structure */
 142         struct  bpf_if *if_bpf;         /* packet filter structure */
 143         u_short if_index;               /* numeric abbreviation for this if  */
 144         short   if_index_reserved;      /* spare space to grow if_index */
 145         struct  ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */
 146         int     if_flags;               /* up/down, broadcast, etc. */
 147         int     if_capabilities;        /* interface features & capabilities */
 148         int     if_capenable;           /* enabled features & capabilities */
 149         void    *if_linkmib;            /* link-type-specific MIB data */
 150         size_t  if_linkmiblen;          /* length of above data */
 151         struct  if_data if_data;
 152         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 153         int     if_amcount;             /* number of all-multicast requests */
 154 /* procedure handles */
 155         int     (*if_output)            /* output routine (enqueue) */
 156                 (struct ifnet *, struct mbuf *, struct sockaddr *,
 157                      struct route *);
 158         void    (*if_input)             /* input routine (from h/w driver) */
 159                 (struct ifnet *, struct mbuf *);
 160         void    (*if_start)             /* initiate output routine */
 161                 (struct ifnet *);
 162         int     (*if_ioctl)             /* ioctl routine */
 163                 (struct ifnet *, u_long, caddr_t);
 164         void    (*if_init)              /* Init routine */
 165                 (void *);
 166         int     (*if_resolvemulti)      /* validate/resolve multicast */
 167                 (struct ifnet *, struct sockaddr **, struct sockaddr *);
 168         void    (*if_qflush)            /* flush any queues */
 169                 (struct ifnet *);
 170         int     (*if_transmit)          /* initiate output routine */
 171                 (struct ifnet *, struct mbuf *);
 172         void    (*if_reassign)          /* reassign to vnet routine */
 173                 (struct ifnet *, struct vnet *, char *);
 174         struct  vnet *if_home_vnet;     /* where this ifnet originates from */
 175         struct  ifaddr  *if_addr;       /* pointer to link-level address */
 176         void    *if_llsoftc;            /* link layer softc */
 177         int     if_drv_flags;           /* driver-managed status flags */
 178         struct  ifaltq if_snd;          /* output queue (includes altq) */
 179         const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */
 180
 181         void    *if_bridge;             /* bridge glue */
 182
 183         struct  label *if_label;        /* interface MAC label */
 184
 185         /* these are only used by IPv6 */
 186         void    *if_unused[2];
 187         void    *if_afdata[AF_MAX];
 188         int     if_afdata_initialized;
 189         struct  rwlock if_afdata_lock;
 190         struct  task if_linktask;       /* task for link change events */
 191         struct  rwlock if_addr_lock;    /* lock to protect address lists */
 192
 193         LIST_ENTRY(ifnet) if_clones;    /* interfaces of a cloner */
 194         TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
 195                                         /* protected by if_addr_lock */
 196         void    *if_pf_kif;
 197         void    *if_lagg;               /* lagg glue */
 198         char    *if_description;        /* interface description */
 199         u_int   if_fib;                 /* interface FIB */
 200         u_char  if_alloctype;           /* if_type at time of allocation */
 201
 202         /*
 203          * Spare fields are added so that we can modify sensitive data
 204          * structures without changing the kernel binary interface, and must
 205          * be used with care where binary compatibility is required.
 206          */
 207         char    if_cspare[3];
 208         int     if_ispare[4];
 209         void    *if_pspare[8];          /* 1 netmap, 7 TDB */
 210 };
 211
 212 typedef void if_init_f_t(void *);
 213
 214 /*
 215  * XXX These aliases are terribly dangerous because they could apply
 216  * to anything.
 217  */
 218 #define if_mtu          if_data.ifi_mtu
 219 #define if_type         if_data.ifi_type
 220 #define if_physical     if_data.ifi_physical
 221 #define if_addrlen      if_data.ifi_addrlen
 222 #define if_hdrlen       if_data.ifi_hdrlen
 223 #define if_metric       if_data.ifi_metric
 224 #define if_link_state   if_data.ifi_link_state
 225 #define if_baudrate     if_data.ifi_baudrate
 226 #define if_hwassist     if_data.ifi_hwassist
 227 #define if_ipackets     if_data.ifi_ipackets
 228 #define if_ierrors      if_data.ifi_ierrors
 229 #define if_opackets     if_data.ifi_opackets
 230 #define if_oerrors      if_data.ifi_oerrors
 231 #define if_collisions   if_data.ifi_collisions
 232 #define if_ibytes       if_data.ifi_ibytes
 233 #define if_obytes       if_data.ifi_obytes
 234 #define if_imcasts      if_data.ifi_imcasts
 235 #define if_omcasts      if_data.ifi_omcasts
 236 #define if_iqdrops      if_data.ifi_iqdrops
 237 #define if_noproto      if_data.ifi_noproto
 238 #define if_lastchange   if_data.ifi_lastchange
 239
 240 /* for compatibility with other BSDs */
 241 #define if_addrlist     if_addrhead
 242 #define if_list         if_link
 243 #define if_name(ifp)    ((ifp)->if_xname)
 244
 245 /*
 246  * Locks for address lists on the network interface.
 247  */
 248 #define IF_ADDR_LOCK_INIT(if)   rw_init(&(if)->if_addr_lock, "if_addr_lock")
 249 #define IF_ADDR_LOCK_DESTROY(if)        rw_destroy(&(if)->if_addr_lock)
 250 #define IF_ADDR_WLOCK(if)       rw_wlock(&(if)->if_addr_lock)
 251 #define IF_ADDR_WUNLOCK(if)     rw_wunlock(&(if)->if_addr_lock)
 252 #define IF_ADDR_RLOCK(if)       rw_rlock(&(if)->if_addr_lock)
 253 #define IF_ADDR_RUNLOCK(if)     rw_runlock(&(if)->if_addr_lock)
 254 #define IF_ADDR_LOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_LOCKED)
 255 #define IF_ADDR_WLOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_WLOCKED)
 256 /* XXX: Compat. */
 257 #define IF_ADDR_LOCK(if)        IF_ADDR_WLOCK(if)
 258 #define IF_ADDR_UNLOCK(if)      IF_ADDR_WUNLOCK(if)
 259
 260 /*
 261  * Function variations on locking macros intended to be used by loadable
 262  * kernel modules in order to divorce them from the internals of address list
 263  * locking.
 264  */
 265 void    if_addr_rlock(struct ifnet *ifp);       /* if_addrhead */
 266 void    if_addr_runlock(struct ifnet *ifp);     /* if_addrhead */
 267 void    if_maddr_rlock(struct ifnet *ifp);      /* if_multiaddrs */
 268 void    if_maddr_runlock(struct ifnet *ifp);    /* if_multiaddrs */
 269
 270 /*
 271  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 272  * are queues of messages stored on ifqueue structures
 273  * (defined above).  Entries are added to and deleted from these structures
 274  * by these macros, which should be called with ipl raised to splimp().
 275  */
 276 #define IF_LOCK(ifq)            mtx_lock(&(ifq)->ifq_mtx)
 277 #define IF_UNLOCK(ifq)          mtx_unlock(&(ifq)->ifq_mtx)
 278 #define IF_LOCK_ASSERT(ifq)     mtx_assert(&(ifq)->ifq_mtx, MA_OWNED)
 279 #define _IF_QFULL(ifq)          ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 280 #define _IF_DROP(ifq)           ((ifq)->ifq_drops++)
 281 #define _IF_QLEN(ifq)           ((ifq)->ifq_len)
 282
 283 #define _IF_ENQUEUE(ifq, m) do {                                \
 284         (m)->m_nextpkt = NULL;                                  \
 285         if ((ifq)->ifq_tail == NULL)                            \
 286                 (ifq)->ifq_head = m;                            \
 287         else                                                    \
 288                 (ifq)->ifq_tail->m_nextpkt = m;                 \
 289         (ifq)->ifq_tail = m;                                    \
 290         (ifq)->ifq_len++;                                       \
 291 } while (0)
 292
 293 #define IF_ENQUEUE(ifq, m) do {                                 \
 294         IF_LOCK(ifq);                                           \
 295         _IF_ENQUEUE(ifq, m);                                    \
 296         IF_UNLOCK(ifq);                                         \
 297 } while (0)
 298
 299 #define _IF_PREPEND(ifq, m) do {                                \
 300         (m)->m_nextpkt = (ifq)->ifq_head;                       \
 301         if ((ifq)->ifq_tail == NULL)                            \
 302                 (ifq)->ifq_tail = (m);                          \
 303         (ifq)->ifq_head = (m);                                  \
 304         (ifq)->ifq_len++;                                       \
 305 } while (0)
 306
 307 #define IF_PREPEND(ifq, m) do {                                 \
 308         IF_LOCK(ifq);                                           \
 309         _IF_PREPEND(ifq, m);                                    \
 310         IF_UNLOCK(ifq);                                         \
 311 } while (0)
 312
 313 #define _IF_DEQUEUE(ifq, m) do {                                \
 314         (m) = (ifq)->ifq_head;                                  \
 315         if (m) {                                                \
 316                 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
 317                         (ifq)->ifq_tail = NULL;                 \
 318                 (m)->m_nextpkt = NULL;                          \
 319                 (ifq)->ifq_len--;                               \
 320         }                                                       \
 321 } while (0)
 322
 323 #define IF_DEQUEUE(ifq, m) do {                                 \
 324         IF_LOCK(ifq);                                           \
 325         _IF_DEQUEUE(ifq, m);                                    \
 326         IF_UNLOCK(ifq);                                         \
 327 } while (0)
 328
 329 #define _IF_DEQUEUE_ALL(ifq, m) do {                            \
 330         (m) = (ifq)->ifq_head;                                  \
 331         (ifq)->ifq_head = (ifq)->ifq_tail = NULL;               \
 332         (ifq)->ifq_len = 0;                                     \
 333 } while (0)
 334
 335 #define IF_DEQUEUE_ALL(ifq, m) do {                             \
 336         IF_LOCK(ifq);                                           \
 337         _IF_DEQUEUE_ALL(ifq, m);                                \
 338         IF_UNLOCK(ifq);                                         \
 339 } while (0)
 340
 341 #define _IF_POLL(ifq, m)        ((m) = (ifq)->ifq_head)
 342 #define IF_POLL(ifq, m)         _IF_POLL(ifq, m)
 343
 344 #define _IF_DRAIN(ifq) do {                                     \
 345         struct mbuf *m;                                         \
 346         for (;;) {                                              \
 347                 _IF_DEQUEUE(ifq, m);                            \
 348                 if (m == NULL)                                  \
 349                         break;                                  \
 350                 m_freem(m);                                     \
 351         }                                                       \
 352 } while (0)
 353
 354 #define IF_DRAIN(ifq) do {                                      \
 355         IF_LOCK(ifq);                                           \
 356         _IF_DRAIN(ifq);                                         \
 357         IF_UNLOCK(ifq);                                         \
 358 } while(0)
 359
 360 #ifdef _KERNEL
 361 /* interface link layer address change event */
 362 typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *);
 363 EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t);
 364 /* interface address change event */
 365 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
 366 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
 367 /* new interface arrival event */
 368 typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *);
 369 EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t);
 370 /* interface departure event */
 371 typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *);
 372 EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t);
 373 /* Interface link state change event */
 374 typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int);
 375 EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t);
 376
 377 /*
 378  * interface groups
 379  */
 380 struct ifg_group {
 381         char                             ifg_group[IFNAMSIZ];
 382         u_int                            ifg_refcnt;
 383         void                            *ifg_pf_kif;
 384         TAILQ_HEAD(, ifg_member)         ifg_members;
 385         TAILQ_ENTRY(ifg_group)           ifg_next;
 386 };
 387
 388 struct ifg_member {
 389         TAILQ_ENTRY(ifg_member)  ifgm_next;
 390         struct ifnet            *ifgm_ifp;
 391 };
 392
 393 struct ifg_list {
 394         struct ifg_group        *ifgl_group;
 395         TAILQ_ENTRY(ifg_list)    ifgl_next;
 396 };
 397
 398 /* group attach event */
 399 typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *);
 400 EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t);
 401 /* group detach event */
 402 typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *);
 403 EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t);
 404 /* group change event */
 405 typedef void (*group_change_event_handler_t)(void *, const char *);
 406 EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t);
 407
 408 #define IF_AFDATA_LOCK_INIT(ifp)        \
 409         rw_init(&(ifp)->if_afdata_lock, "if_afdata")
 410
 411 #define IF_AFDATA_WLOCK(ifp)    rw_wlock(&(ifp)->if_afdata_lock)
 412 #define IF_AFDATA_RLOCK(ifp)    rw_rlock(&(ifp)->if_afdata_lock)
 413 #define IF_AFDATA_WUNLOCK(ifp)  rw_wunlock(&(ifp)->if_afdata_lock)
 414 #define IF_AFDATA_RUNLOCK(ifp)  rw_runlock(&(ifp)->if_afdata_lock)
 415 #define IF_AFDATA_LOCK(ifp)     IF_AFDATA_WLOCK(ifp)
 416 #define IF_AFDATA_UNLOCK(ifp)   IF_AFDATA_WUNLOCK(ifp)
 417 #define IF_AFDATA_TRYLOCK(ifp)  rw_try_wlock(&(ifp)->if_afdata_lock)
 418 #define IF_AFDATA_DESTROY(ifp)  rw_destroy(&(ifp)->if_afdata_lock)
 419
 420 #define IF_AFDATA_LOCK_ASSERT(ifp)      rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED)
 421 #define IF_AFDATA_UNLOCK_ASSERT(ifp)    rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED)
 422
 423 int     if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp,
 424             int adjust);
 425 #define IF_HANDOFF(ifq, m, ifp)                 \
 426         if_handoff((struct ifqueue *)ifq, m, ifp, 0)
 427 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj)        \
 428         if_handoff((struct ifqueue *)ifq, m, ifp, adj)
 429
 430 void    if_start(struct ifnet *);
 431
 432 #define IFQ_ENQUEUE(ifq, m, err)                                        \
 433 do {                                                                    \
 434         IF_LOCK(ifq);                                                   \
 435         if (ALTQ_IS_ENABLED(ifq))                                       \
 436                 ALTQ_ENQUEUE(ifq, m, NULL, err);                        \
 437         else {                                                          \
 438                 if (_IF_QFULL(ifq)) {                                   \
 439                         m_freem(m);                                     \
 440                         (err) = ENOBUFS;                                \
 441                 } else {                                                \
 442                         _IF_ENQUEUE(ifq, m);                            \
 443                         (err) = 0;                                      \
 444                 }                                                       \
 445         }                                                               \
 446         if (err)                                                        \
 447                 (ifq)->ifq_drops++;                                     \
 448         IF_UNLOCK(ifq);                                                 \
 449 } while (0)
 450
 451 #define IFQ_DEQUEUE_NOLOCK(ifq, m)                                      \
 452 do {                                                                    \
 453         if (TBR_IS_ENABLED(ifq))                                        \
 454                 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE);               \
 455         else if (ALTQ_IS_ENABLED(ifq))                                  \
 456                 ALTQ_DEQUEUE(ifq, m);                                   \
 457         else                                                            \
 458                 _IF_DEQUEUE(ifq, m);                                    \
 459 } while (0)
 460
 461 #define IFQ_DEQUEUE(ifq, m)                                             \
 462 do {                                                                    \
 463         IF_LOCK(ifq);                                                   \
 464         IFQ_DEQUEUE_NOLOCK(ifq, m);                                     \
 465         IF_UNLOCK(ifq);                                                 \
 466 } while (0)
 467
 468 #define IFQ_POLL_NOLOCK(ifq, m)                                         \
 469 do {                                                                    \
 470         if (TBR_IS_ENABLED(ifq))                                        \
 471                 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL);                 \
 472         else if (ALTQ_IS_ENABLED(ifq))                                  \
 473                 ALTQ_POLL(ifq, m);                                      \
 474         else                                                            \
 475                 _IF_POLL(ifq, m);                                       \
 476 } while (0)
 477
 478 #define IFQ_POLL(ifq, m)                                                \
 479 do {                                                                    \
 480         IF_LOCK(ifq);                                                   \
 481         IFQ_POLL_NOLOCK(ifq, m);                                        \
 482         IF_UNLOCK(ifq);                                                 \
 483 } while (0)
 484
 485 #define IFQ_PURGE_NOLOCK(ifq)                                           \
 486 do {                                                                    \
 487         if (ALTQ_IS_ENABLED(ifq)) {                                     \
 488                 ALTQ_PURGE(ifq);                                        \
 489         } else                                                          \
 490                 _IF_DRAIN(ifq);                                         \
 491 } while (0)
 492
 493 #define IFQ_PURGE(ifq)                                                  \
 494 do {                                                                    \
 495         IF_LOCK(ifq);                                                   \
 496         IFQ_PURGE_NOLOCK(ifq);                                          \
 497         IF_UNLOCK(ifq);                                                 \
 498 } while (0)
 499
 500 #define IFQ_SET_READY(ifq)                                              \
 501         do { ((ifq)->altq_flags |= ALTQF_READY); } while (0)
 502
 503 #define IFQ_LOCK(ifq)                   IF_LOCK(ifq)
 504 #define IFQ_UNLOCK(ifq)                 IF_UNLOCK(ifq)
 505 #define IFQ_LOCK_ASSERT(ifq)            IF_LOCK_ASSERT(ifq)
 506 #define IFQ_IS_EMPTY(ifq)               ((ifq)->ifq_len == 0)
 507 #define IFQ_INC_LEN(ifq)                ((ifq)->ifq_len++)
 508 #define IFQ_DEC_LEN(ifq)                (--(ifq)->ifq_len)
 509 #define IFQ_INC_DROPS(ifq)              ((ifq)->ifq_drops++)
 510 #define IFQ_SET_MAXLEN(ifq, len)        ((ifq)->ifq_maxlen = (len))
 511
 512 /*
 513  * The IFF_DRV_OACTIVE test should really occur in the device driver, not in
 514  * the handoff logic, as that flag is locked by the device driver.
 515  */
 516 #define IFQ_HANDOFF_ADJ(ifp, m, adj, err)                               \
 517 do {                                                                    \
 518         int len;                                                        \
 519         short mflags;                                                   \
 520                                                                         \
 521         len = (m)->m_pkthdr.len;                                        \
 522         mflags = (m)->m_flags;                                          \
 523         IFQ_ENQUEUE(&(ifp)->if_snd, m, err);                            \
 524         if ((err) == 0) {                                               \
 525                 (ifp)->if_obytes += len + (adj);                        \
 526                 if (mflags & M_MCAST)                                   \
 527                         (ifp)->if_omcasts++;                            \
 528                 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0)       \
 529                         if_start(ifp);                                  \
 530         }                                                               \
 531 } while (0)
 532
 533 #define IFQ_HANDOFF(ifp, m, err)                                        \
 534         IFQ_HANDOFF_ADJ(ifp, m, 0, err)
 535
 536 #define IFQ_DRV_DEQUEUE(ifq, m)                                         \
 537 do {                                                                    \
 538         (m) = (ifq)->ifq_drv_head;                                      \
 539         if (m) {                                                        \
 540                 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL)     \
 541                         (ifq)->ifq_drv_tail = NULL;                     \
 542                 (m)->m_nextpkt = NULL;                                  \
 543                 (ifq)->ifq_drv_len--;                                   \
 544         } else {                                                        \
 545                 IFQ_LOCK(ifq);                                          \
 546                 IFQ_DEQUEUE_NOLOCK(ifq, m);                             \
 547                 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) {    \
 548                         struct mbuf *m0;                                \
 549                         IFQ_DEQUEUE_NOLOCK(ifq, m0);                    \
 550                         if (m0 == NULL)                                 \
 551                                 break;                                  \
 552                         m0->m_nextpkt = NULL;                           \
 553                         if ((ifq)->ifq_drv_tail == NULL)                \
 554                                 (ifq)->ifq_drv_head = m0;               \
 555                         else                                            \
 556                                 (ifq)->ifq_drv_tail->m_nextpkt = m0;    \
 557                         (ifq)->ifq_drv_tail = m0;                       \
 558                         (ifq)->ifq_drv_len++;                           \
 559                 }                                                       \
 560                 IFQ_UNLOCK(ifq);                                        \
 561         }                                                               \
 562 } while (0)
 563
 564 #define IFQ_DRV_PREPEND(ifq, m)                                         \
 565 do {                                                                    \
 566         (m)->m_nextpkt = (ifq)->ifq_drv_head;                           \
 567         if ((ifq)->ifq_drv_tail == NULL)                                \
 568                 (ifq)->ifq_drv_tail = (m);                              \
 569         (ifq)->ifq_drv_head = (m);                                      \
 570         (ifq)->ifq_drv_len++;                                           \
 571 } while (0)
 572
 573 #define IFQ_DRV_IS_EMPTY(ifq)                                           \
 574         (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0))
 575
 576 #define IFQ_DRV_PURGE(ifq)                                              \
 577 do {                                                                    \
 578         struct mbuf *m, *n = (ifq)->ifq_drv_head;                       \
 579         while((m = n) != NULL) {                                        \
 580                 n = m->m_nextpkt;                                       \
 581                 m_freem(m);                                             \
 582         }                                                               \
 583         (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL;               \
 584         (ifq)->ifq_drv_len = 0;                                         \
 585         IFQ_PURGE(ifq);                                                 \
 586 } while (0)
 587
 588 #ifdef _KERNEL
 589 static __inline void
 590 drbr_stats_update(struct ifnet *ifp, int len, int mflags)
 591 {
 592 #ifndef NO_SLOW_STATS
 593         ifp->if_obytes += len;
 594         if (mflags & M_MCAST)
 595                 ifp->if_omcasts++;
 596 #endif
 597 }
 598
 599 static __inline int
 600 drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m)
 601 {
 602         int error = 0;
 603         int len = m->m_pkthdr.len;
 604         int mflags = m->m_flags;
 605
 606 #ifdef ALTQ
 607         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 608                 IFQ_ENQUEUE(&ifp->if_snd, m, error);
 609                 return (error);
 610         }
 611 #endif
 612         if ((error = buf_ring_enqueue_bytes(br, m, len)) == ENOBUFS) {
 613                 br->br_drops++;
 614                 m_freem(m);
 615         } else
 616                 drbr_stats_update(ifp, len, mflags);
 617
 618         return (error);
 619 }
 620
 621 static __inline void
 622 drbr_flush(struct ifnet *ifp, struct buf_ring *br)
 623 {
 624         struct mbuf *m;
 625
 626 #ifdef ALTQ
 627         if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd))
 628                 IFQ_PURGE(&ifp->if_snd);
 629 #endif
 630         while ((m = buf_ring_dequeue_sc(br)) != NULL)
 631                 m_freem(m);
 632 }
 633
 634 static __inline void
 635 drbr_free(struct buf_ring *br, struct malloc_type *type)
 636 {
 637
 638         drbr_flush(NULL, br);
 639         buf_ring_free(br, type);
 640 }
 641
 642 static __inline struct mbuf *
 643 drbr_dequeue(struct ifnet *ifp, struct buf_ring *br)
 644 {
 645 #ifdef ALTQ
 646         struct mbuf *m;
 647
 648         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 649                 IFQ_DEQUEUE(&ifp->if_snd, m);
 650                 return (m);
 651         }
 652 #endif
 653         return (buf_ring_dequeue_sc(br));
 654 }
 655
 656 static __inline struct mbuf *
 657 drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br,
 658     int (*func) (struct mbuf *, void *), void *arg)
 659 {
 660         struct mbuf *m;
 661 #ifdef ALTQ
 662         if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
 663                 IFQ_LOCK(&ifp->if_snd);
 664                 IFQ_POLL_NOLOCK(&ifp->if_snd, m);
 665                 if (m != NULL && func(m, arg) == 0) {
 666                         IFQ_UNLOCK(&ifp->if_snd);
 667                         return (NULL);
 668                 }
 669                 IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m);
 670                 IFQ_UNLOCK(&ifp->if_snd);
 671                 return (m);
 672         }
 673 #endif
 674         m = buf_ring_peek(br);
 675         if (m == NULL || func(m, arg) == 0)
 676                 return (NULL);
 677
 678         return (buf_ring_dequeue_sc(br));
 679 }
 680
 681 static __inline int
 682 drbr_empty(struct ifnet *ifp, struct buf_ring *br)
 683 {
 684 #ifdef ALTQ
 685         if (ALTQ_IS_ENABLED(&ifp->if_snd))
 686                 return (IFQ_IS_EMPTY(&ifp->if_snd));
 687 #endif
 688         return (buf_ring_empty(br));
 689 }
 690
 691 static __inline int
 692 drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br)
 693 {
 694 #ifdef ALTQ
 695         if (ALTQ_IS_ENABLED(&ifp->if_snd))
 696                 return (1);
 697 #endif
 698         return (!buf_ring_empty(br));
 699 }
 700
 701 static __inline int
 702 drbr_inuse(struct ifnet *ifp, struct buf_ring *br)
 703 {
 704 #ifdef ALTQ
 705         if (ALTQ_IS_ENABLED(&ifp->if_snd))
 706                 return (ifp->if_snd.ifq_len);
 707 #endif
 708         return (buf_ring_count(br));
 709 }
 710 #endif
 711 /*
 712  * 72 was chosen below because it is the size of a TCP/IP
 713  * header (40) + the minimum mss (32).
 714  */
 715 #define IF_MINMTU       72
 716 #define IF_MAXMTU       65535
 717
 718 #endif /* _KERNEL */
 719
 720 /*
 721  * The ifaddr structure contains information about one address
 722  * of an interface.  They are maintained by the different address families,
 723  * are allocated and attached when an address is set, and are linked
 724  * together so all addresses for an interface can be located.
 725  *
 726  * NOTE: a 'struct ifaddr' is always at the beginning of a larger
 727  * chunk of malloc'ed memory, where we store the three addresses
 728  * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here.
 729  */
 730 struct ifaddr {
 731         struct  sockaddr *ifa_addr;     /* address of interface */
 732         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 733 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 734         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 735         struct  if_data if_data;        /* not all members are meaningful */
 736         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 737         struct  carp_softc *ifa_carp;   /* pointer to CARP data */
 738         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
 739         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 740                 (int, struct rtentry *, struct rt_addrinfo *);
 741         u_short ifa_flags;              /* mostly rt_flags for cloning */
 742         u_int   ifa_refcnt;             /* references to this structure */
 743         int     ifa_metric;             /* cost of going out this interface */
 744         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 745                 (struct ifaddr *, struct sockaddr *);
 746         struct mtx ifa_mtx;
 747 };
 748 #define IFA_ROUTE       RTF_UP          /* route installed */
 749 #define IFA_RTSELF      RTF_HOST        /* loopback route to self installed */
 750
 751 /* for compatibility with other BSDs */
 752 #define ifa_list        ifa_link
 753
 754 #ifdef _KERNEL
 755 #define IFA_LOCK(ifa)           mtx_lock(&(ifa)->ifa_mtx)
 756 #define IFA_UNLOCK(ifa)         mtx_unlock(&(ifa)->ifa_mtx)
 757
 758 void    ifa_free(struct ifaddr *ifa);
 759 void    ifa_init(struct ifaddr *ifa);
 760 void    ifa_ref(struct ifaddr *ifa);
 761 #endif
 762
 763 /*
 764  * Multicast address structure.  This is analogous to the ifaddr
 765  * structure except that it keeps track of multicast addresses.
 766  */
 767 struct ifmultiaddr {
 768         TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 769         struct  sockaddr *ifma_addr;    /* address this membership is for */
 770         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 771         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 772         u_int   ifma_refcount;          /* reference count */
 773         void    *ifma_protospec;        /* protocol-specific state, if any */
 774         struct  ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */
 775 };
 776
 777 #ifdef _KERNEL
 778
 779 extern  struct rwlock ifnet_rwlock;
 780 extern  struct sx ifnet_sxlock;
 781
 782 #define IFNET_LOCK_INIT() do {                                          \
 783         rw_init_flags(&ifnet_rwlock, "ifnet_rw",  RW_RECURSE);          \
 784         sx_init_flags(&ifnet_sxlock, "ifnet_sx",  SX_RECURSE);          \
 785 } while(0)
 786
 787 #define IFNET_WLOCK() do {                                              \
 788         sx_xlock(&ifnet_sxlock);                                        \
 789         rw_wlock(&ifnet_rwlock);                                        \
 790 } while (0)
 791
 792 #define IFNET_WUNLOCK() do {                                            \
 793         rw_wunlock(&ifnet_rwlock);                                      \
 794         sx_xunlock(&ifnet_sxlock);                                      \
 795 } while (0)
 796
 797 /*
 798  * To assert the ifnet lock, you must know not only whether it's for read or
 799  * write, but also whether it was acquired with sleep support or not.
 800  */
 801 #define IFNET_RLOCK_ASSERT()            sx_assert(&ifnet_sxlock, SA_SLOCKED)
 802 #define IFNET_RLOCK_NOSLEEP_ASSERT()    rw_assert(&ifnet_rwlock, RA_RLOCKED)
 803 #define IFNET_WLOCK_ASSERT() do {                                       \
 804         sx_assert(&ifnet_sxlock, SA_XLOCKED);                           \
 805         rw_assert(&ifnet_rwlock, RA_WLOCKED);                           \
 806 } while (0)
 807
 808 #define IFNET_RLOCK()           sx_slock(&ifnet_sxlock)
 809 #define IFNET_RLOCK_NOSLEEP()   rw_rlock(&ifnet_rwlock)
 810 #define IFNET_RUNLOCK()         sx_sunlock(&ifnet_sxlock)
 811 #define IFNET_RUNLOCK_NOSLEEP() rw_runlock(&ifnet_rwlock)
 812
 813 /*
 814  * Look up an ifnet given its index; the _ref variant also acquires a
 815  * reference that must be freed using if_rele().  It is almost always a bug
 816  * to call ifnet_byindex() instead if ifnet_byindex_ref().
 817  */
 818 struct ifnet    *ifnet_byindex(u_short idx);
 819 struct ifnet    *ifnet_byindex_locked(u_short idx);
 820 struct ifnet    *ifnet_byindex_ref(u_short idx);
 821
 822 /*
 823  * Given the index, ifaddr_byindex() returns the one and only
 824  * link-level ifaddr for the interface. You are not supposed to use
 825  * it to traverse the list of addresses associated to the interface.
 826  */
 827 struct ifaddr   *ifaddr_byindex(u_short idx);
 828
 829 VNET_DECLARE(struct ifnethead, ifnet);
 830 VNET_DECLARE(struct ifgrouphead, ifg_head);
 831 VNET_DECLARE(int, if_index);
 832 VNET_DECLARE(struct ifnet *, loif);     /* first loopback interface */
 833 VNET_DECLARE(int, useloopback);
 834
 835 #define V_ifnet         VNET(ifnet)
 836 #define V_ifg_head      VNET(ifg_head)
 837 #define V_if_index      VNET(if_index)
 838 #define V_loif          VNET(loif)
 839 #define V_useloopback   VNET(useloopback)
 840
 841 extern  int ifqmaxlen;
 842
 843 int     if_addgroup(struct ifnet *, const char *);
 844 int     if_delgroup(struct ifnet *, const char *);
 845 int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
 846 int     if_allmulti(struct ifnet *, int);
 847 struct  ifnet* if_alloc(u_char);
 848 void    if_attach(struct ifnet *);
 849 void    if_dead(struct ifnet *);
 850 int     if_delmulti(struct ifnet *, struct sockaddr *);
 851 void    if_delmulti_ifma(struct ifmultiaddr *);
 852 void    if_detach(struct ifnet *);
 853 void    if_vmove(struct ifnet *, struct vnet *);
 854 void    if_purgeaddrs(struct ifnet *);
 855 void    if_delallmulti(struct ifnet *);
 856 void    if_down(struct ifnet *);
 857 struct ifmultiaddr *
 858         if_findmulti(struct ifnet *, struct sockaddr *);
 859 void    if_free(struct ifnet *);
 860 void    if_initname(struct ifnet *, const char *, int);
 861 void    if_link_state_change(struct ifnet *, int);
 862 int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
 863 void    if_qflush(struct ifnet *);
 864 void    if_ref(struct ifnet *);
 865 void    if_rele(struct ifnet *);
 866 int     if_setlladdr(struct ifnet *, const u_char *, int);
 867 void    if_up(struct ifnet *);
 868 int     ifioctl(struct socket *, u_long, caddr_t, struct thread *);
 869 int     ifpromisc(struct ifnet *, int);
 870 struct  ifnet *ifunit(const char *);
 871 struct  ifnet *ifunit_ref(const char *);
 872
 873 void    ifq_init(struct ifaltq *, struct ifnet *ifp);
 874 void    ifq_delete(struct ifaltq *);
 875
 876 int     ifa_add_loopback_route(struct ifaddr *, struct sockaddr *);
 877 int     ifa_del_loopback_route(struct ifaddr *, struct sockaddr *);
 878
 879 struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
 880 int             ifa_ifwithaddr_check(struct sockaddr *);
 881 struct  ifaddr *ifa_ifwithbroadaddr(struct sockaddr *);
 882 struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
 883 struct  ifaddr *ifa_ifwithnet(struct sockaddr *, int);
 884 struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
 885 struct  ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int);
 886
 887 struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 888
 889 int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
 890
 891 typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp);
 892 typedef void if_com_free_t(void *com, u_char type);
 893 void    if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f);
 894 void    if_deregister_com_alloc(u_char type);
 895
 896 #define IF_LLADDR(ifp)                                                  \
 897     LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr))
 898
 899 #ifdef DEVICE_POLLING
 900 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS };
 901
 902 typedef int poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
 903 int    ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
 904 int    ether_poll_deregister(struct ifnet *ifp);
 905 #endif /* DEVICE_POLLING */
 906
 907 #endif /* _KERNEL */
 908
 909 #endif /* !_NET_IF_VAR_H_ */