sys/net/if_var.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      From: @(#)if.h  8.1 (Berkeley) 6/10/93
  34  * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.16 2003/04/15 18:11:19 fjoe Exp $
  35  * $DragonFly: src/sys/net/if_var.h,v 1.71 2008/11/22 04:00:53 sephe Exp $
  36  */
  37
  38 #ifndef _NET_IF_VAR_H_
  39 #define _NET_IF_VAR_H_
  40
  41 #ifndef _SYS_SERIALIZE_H_
  42 #include <sys/serialize.h>
  43 #endif
  44 #ifndef _NET_IF_H_
  45 #include <net/if.h>
  46 #endif
  47
  48 /*
  49  * Structures defining a network interface, providing a packet
  50  * transport mechanism (ala level 0 of the PUP protocols).
  51  *
  52  * Each interface accepts output datagrams of a specified maximum
  53  * length, and provides higher level routines with input datagrams
  54  * received from its medium.
  55  *
  56  * Output occurs when the routine if_output is called, with four parameters:
  57  *      ifp->if_output(ifp, m, dst, rt)
  58  * Here m is the mbuf chain to be sent and dst is the destination address.
  59  * The output routine encapsulates the supplied datagram if necessary,
  60  * and then transmits it on its medium.
  61  *
  62  * On input, each interface unwraps the data received by it, and either
  63  * places it on the input queue of a internetwork datagram routine
  64  * and posts the associated software interrupt, or passes the datagram to
  65  * the routine if_input. It is called with the mbuf chain as parameter:
  66  *      ifp->if_input(ifp, m)
  67  * The input routine removes the protocol dependent header if necessary.
  68  *
  69  * Routines exist for locating interfaces by their addresses
  70  * or for locating a interface on a certain network, as well as more general
  71  * routing and gateway routines maintaining information used to locate
  72  * interfaces.  These routines live in the files if.c and route.c
  73  */
  74
  75 /*
  76  * Forward structure declarations for function prototypes [sic].
  77  */
  78 struct  mbuf;
  79 struct  mbuf_chain;
  80 struct  proc;
  81 struct  rtentry;
  82 struct  rt_addrinfo;
  83 struct  socket;
  84 struct  ether_header;
  85 struct  ucred;
  86 struct  lwkt_serialize;
  87 struct  ifaddr_container;
  88 struct  ifaddr;
  89 struct  lwkt_port;
  90 struct  lwkt_msg;
  91 struct  netmsg;
  92
  93 #include <sys/queue.h>          /* get TAILQ macros */
  94
  95 #include <net/altq/if_altq.h>
  96
  97 #ifdef _KERNEL
  98 #include <sys/eventhandler.h>
  99 #include <sys/mbuf.h>
 100 #include <sys/systm.h>          /* XXX */
 101 #include <sys/thread2.h>
 102 #endif /* _KERNEL */
 103
 104 #define IF_DUNIT_NONE   -1
 105
 106 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 107 TAILQ_HEAD(ifaddrhead, ifaddr_container); /* instantiation is preserved in the list */
 108 TAILQ_HEAD(ifprefixhead, ifprefix);
 109 LIST_HEAD(ifmultihead, ifmultiaddr);
 110
 111 /*
 112  * Structure defining a queue for a network interface.
 113  */
 114 struct  ifqueue {
 115         struct  mbuf *ifq_head;
 116         struct  mbuf *ifq_tail;
 117         int     ifq_len;
 118         int     ifq_maxlen;
 119         int     ifq_drops;
 120 };
 121
 122 /*
 123  * Note of DEVICE_POLLING
 124  * 1) Any file(*.c) that depends on DEVICE_POLLING supports in this
 125  *    file should include opt_polling.h at its beginning.
 126  * 2) When struct changes, which are conditioned by DEVICE_POLLING,
 127  *    are to be introduced, please keep the struct's size and layout
 128  *    same, no matter whether DEVICE_POLLING is defined or not.
 129  *    See ifnet.if_poll and ifnet.if_poll_unused for example.
 130  */
 131
 132 #ifdef DEVICE_POLLING
 133 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER,
 134                 POLL_REGISTER };
 135 #endif
 136
 137 /*
 138  * Structure defining a network interface.
 139  *
 140  * (Would like to call this struct ``if'', but C isn't PL/1.)
 141  */
 142
 143 /*
 144  * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
 145  * one of these structures, typically held within an arpcom structure.
 146  *
 147  *      struct <foo>_softc {
 148  *              struct arpcom {
 149  *                      struct  ifnet ac_if;
 150  *                      ...
 151  *              } <arpcom> ;
 152  *              ...
 153  *      };
 154  *
 155  * The assumption is used in a number of places, including many
 156  * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
 157  *
 158  * Unfortunately devices' softc are opaque, so we depend on this layout
 159  * to locate the struct ifnet from the softc in the generic code.
 160  *
 161  * MPSAFE NOTES:
 162  *
 163  * ifnet is protected by if_serializer.  ifnet.if_snd is protected by its
 164  * own spinlock.  Callers of if_ioctl, if_start, if_watchdog, if_init,
 165  * if_resolvemulti, and if_poll hold if_serializer.  Device drivers usually
 166  * use the same serializer for their interrupt but this is not required.
 167  * Caller of if_output must not hold if_serializer; if_output should hold
 168  * if_serializer based on its own needs.  However, the device driver must
 169  * be holding if_serializer when it calls if_input.  Note that the serializer
 170  * may be temporarily released within if_input to avoid a deadlock (e.g. when
 171  * fast-forwarding or bridging packets between interfaces).
 172  *
 173  * If a device driver installs the same serializer for its interrupt
 174  * as for ifnet, then the driver only really needs to worry about further
 175  * serialization in timeout based entry points.  All other entry points
 176  * will already be serialized.  Older ISA drivers still using the old
 177  * interrupt infrastructure will have to obtain and release the serializer
 178  * in their interrupt routine themselves.
 179  */
 180 struct ifnet {
 181         void    *if_softc;              /* pointer to driver state */
 182         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 183         char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
 184         const char *if_dname;           /* driver name */
 185         int     if_dunit;               /* unit or IF_DUNIT_NONE */
 186         void    *if_vlantrunks;         /* vlan trunks */
 187         struct  ifaddrhead *if_addrheads; /* array[NCPU] of TAILQs of addresses per if */
 188         int     if_pcount;              /* number of promiscuous listeners */
 189         void    *if_carp;               /* carp interfaces */
 190         struct  bpf_if *if_bpf;         /* packet filter structure */
 191         u_short if_index;               /* numeric abbreviation for this if  */
 192         short   if_timer;               /* time 'til if_watchdog called */
 193         int     if_flags;               /* up/down, broadcast, etc. */
 194         int     if_capabilities;        /* interface capabilities */
 195         int     if_capenable;           /* enabled features */
 196         void    *if_linkmib;            /* link-type-specific MIB data */
 197         size_t  if_linkmiblen;          /* length of above data */
 198         struct  if_data if_data;
 199         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 200         int     if_amcount;             /* number of all-multicast requests */
 201 /* procedure handles */
 202         int     (*if_output)            /* output routine (enqueue) */
 203                 (struct ifnet *, struct mbuf *, struct sockaddr *,
 204                      struct rtentry *);
 205         void    (*if_input)             /* input routine from hardware driver */
 206                 (struct ifnet *, struct mbuf *);
 207         void    (*if_start)             /* initiate output routine */
 208                 (struct ifnet *);
 209         int     (*if_ioctl)             /* ioctl routine */
 210                 (struct ifnet *, u_long, caddr_t, struct ucred *);
 211         void    (*if_watchdog)          /* timer routine */
 212                 (struct ifnet *);
 213         void    (*if_init)              /* Init routine */
 214                 (void *);
 215         int     (*if_resolvemulti)      /* validate/resolve multicast */
 216                 (struct ifnet *, struct sockaddr **, struct sockaddr *);
 217         int     (*if_start_cpuid)       /* cpuid to run if_start */
 218                 (struct ifnet *);
 219 #ifdef DEVICE_POLLING
 220         void    (*if_poll)              /* IFF_POLLING support */
 221                 (struct ifnet *, enum poll_cmd, int);
 222         int     if_poll_cpuid;
 223 #else
 224         /* Place holders */
 225         void    (*if_poll_unused)(void);
 226         int     if_poll_cpuid_used;
 227 #endif
 228         struct  ifaltq if_snd;          /* output queue (includes altq) */
 229         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 230         const uint8_t   *if_broadcastaddr;
 231         void    *if_bridge;             /* bridge glue */
 232         void    *if_afdata[AF_MAX];
 233         struct ifaddr   *if_lladdr;
 234         struct lwkt_serialize *if_serializer;   /* serializer or MP lock */
 235         struct lwkt_serialize if_default_serializer; /* if not supplied */
 236         int     if_cpuid;
 237         struct netmsg *if_start_nmsg; /* percpu messages to schedule if_start */
 238 };
 239 typedef void if_init_f_t (void *);
 240
 241 #define if_mtu          if_data.ifi_mtu
 242 #define if_type         if_data.ifi_type
 243 #define if_physical     if_data.ifi_physical
 244 #define if_addrlen      if_data.ifi_addrlen
 245 #define if_hdrlen       if_data.ifi_hdrlen
 246 #define if_metric       if_data.ifi_metric
 247 #define if_link_state   if_data.ifi_link_state
 248 #define if_baudrate     if_data.ifi_baudrate
 249 #define if_hwassist     if_data.ifi_hwassist
 250 #define if_ipackets     if_data.ifi_ipackets
 251 #define if_ierrors      if_data.ifi_ierrors
 252 #define if_opackets     if_data.ifi_opackets
 253 #define if_oerrors      if_data.ifi_oerrors
 254 #define if_collisions   if_data.ifi_collisions
 255 #define if_ibytes       if_data.ifi_ibytes
 256 #define if_obytes       if_data.ifi_obytes
 257 #define if_imcasts      if_data.ifi_imcasts
 258 #define if_omcasts      if_data.ifi_omcasts
 259 #define if_iqdrops      if_data.ifi_iqdrops
 260 #define if_noproto      if_data.ifi_noproto
 261 #define if_lastchange   if_data.ifi_lastchange
 262 #define if_recvquota    if_data.ifi_recvquota
 263 #define if_xmitquota    if_data.ifi_xmitquota
 264 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
 265
 266 /* for compatibility with other BSDs */
 267 #define if_list         if_link
 268
 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_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 277 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 278 #define IF_QLEN(ifq)            ((ifq)->ifq_len)
 279 #define IF_QEMPTY(ifq)          (IF_QLEN(ifq) == 0)
 280 #define IF_ENQUEUE(ifq, m) do {                                         \
 281         (m)->m_nextpkt = 0;                                             \
 282         if ((ifq)->ifq_tail == 0)                                       \
 283                 (ifq)->ifq_head = m;                                    \
 284         else                                                            \
 285                 (ifq)->ifq_tail->m_nextpkt = m;                         \
 286         (ifq)->ifq_tail = m;                                            \
 287         (ifq)->ifq_len++;                                               \
 288 } while (0)
 289 #define IF_PREPEND(ifq, m) do {                                         \
 290         (m)->m_nextpkt = (ifq)->ifq_head;                               \
 291         if ((ifq)->ifq_tail == 0)                                       \
 292                 (ifq)->ifq_tail = (m);                                  \
 293         (ifq)->ifq_head = (m);                                          \
 294         (ifq)->ifq_len++;                                               \
 295 } while (0)
 296 #define IF_DEQUEUE(ifq, m) do {                                         \
 297         (m) = (ifq)->ifq_head;                                          \
 298         if (m) {                                                        \
 299                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0)            \
 300                         (ifq)->ifq_tail = 0;                            \
 301                 (m)->m_nextpkt = 0;                                     \
 302                 (ifq)->ifq_len--;                                       \
 303         }                                                               \
 304 } while (0)
 305
 306 #define IF_POLL(ifq, m)         ((m) = (ifq)->ifq_head)
 307
 308 #define IF_DRAIN(ifq) do {                                              \
 309         struct mbuf *m;                                                 \
 310         while (1) {                                                     \
 311                 IF_DEQUEUE(ifq, m);                                     \
 312                 if (m == NULL)                                          \
 313                         break;                                          \
 314                 m_freem(m);                                             \
 315         }                                                               \
 316 } while (0)
 317
 318 #ifdef _KERNEL
 319
 320 /*
 321  * DEPRECATED - should not be used by any new driver.  This code uses the
 322  * old queueing interface and if_start ABI and does not use the ifp's
 323  * serializer.
 324  */
 325 #define IF_HANDOFF(ifq, m, ifp)                 if_handoff(ifq, m, ifp, 0)
 326 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj)        if_handoff(ifq, m, ifp, adj)
 327
 328 static __inline int
 329 if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp,
 330            int _adjust)
 331 {
 332         int _need_if_start = 0;
 333
 334         crit_enter();
 335
 336         if (IF_QFULL(_ifq)) {
 337                 IF_DROP(_ifq);
 338                 crit_exit();
 339                 m_freem(_m);
 340                 return (0);
 341         }
 342         if (_ifp != NULL) {
 343                 _ifp->if_obytes += _m->m_pkthdr.len + _adjust;
 344                 if (_m->m_flags & M_MCAST)
 345                         _ifp->if_omcasts++;
 346                 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE);
 347         }
 348         IF_ENQUEUE(_ifq, _m);
 349         if (_need_if_start) {
 350                 (*_ifp->if_start)(_ifp);
 351         }
 352         crit_exit();
 353         return (1);
 354 }
 355
 356 /*
 357  * 72 was chosen below because it is the size of a TCP/IP
 358  * header (40) + the minimum mss (32).
 359  */
 360 #define IF_MINMTU       72
 361 #define IF_MAXMTU       65535
 362
 363 #endif /* _KERNEL */
 364
 365 struct in_ifaddr;
 366
 367 struct in_ifaddr_container {
 368         struct in_ifaddr        *ia;
 369         LIST_ENTRY(in_ifaddr_container) ia_hash;
 370                                 /* entry in bucket of inet addresses */
 371         TAILQ_ENTRY(in_ifaddr_container) ia_link;
 372                                 /* list of internet addresses */
 373         struct ifaddr_container *ia_ifac; /* parent ifaddr_container */
 374 };
 375
 376 struct ifaddr_container {
 377 #define IFA_CONTAINER_MAGIC     0x19810219
 378 #define IFA_CONTAINER_DEAD      0xc0dedead
 379         uint32_t                ifa_magic;  /* IFA_CONTAINER_MAGIC */
 380         struct ifaddr           *ifa;
 381         TAILQ_ENTRY(ifaddr_container)   ifa_link;   /* queue macro glue */
 382         u_int                   ifa_refcnt; /* references to this structure */
 383         uint16_t                ifa_listmask;   /* IFA_LIST_ */
 384         uint16_t                ifa_prflags;    /* protocol specific flags */
 385
 386         /*
 387          * Protocol specific states
 388          */
 389         union {
 390                 struct in_ifaddr_container u_in_ifac;
 391         } ifa_proto_u;
 392 };
 393
 394 #define IFA_LIST_IFADDRHEAD     0x01    /* on ifnet.if_addrheads[cpuid] */
 395 #define IFA_LIST_IN_IFADDRHEAD  0x02    /* on in_ifaddrheads[cpuid] */
 396 #define IFA_LIST_IN_IFADDRHASH  0x04    /* on in_ifaddrhashtbls[cpuid] */
 397
 398 #define IFA_PRF_FLAG0           0x01
 399 #define IFA_PRF_FLAG1           0x02
 400 #define IFA_PRF_FLAG2           0x04
 401 #define IFA_PRF_FLAG3           0x08
 402
 403 /*
 404  * The ifaddr structure contains information about one address
 405  * of an interface.  They are maintained by the different address families,
 406  * are allocated and attached when an address is set, and are linked
 407  * together so all addresses for an interface can be located.
 408  */
 409 struct ifaddr {
 410         struct  sockaddr *ifa_addr;     /* address of interface */
 411         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 412 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 413         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 414         struct  if_data if_data;        /* not all members are meaningful */
 415         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 416         void    *ifa_link_pad;
 417         struct ifaddr_container *ifa_containers;
 418         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 419                 (int, struct rtentry *, struct rt_addrinfo *);
 420         u_short ifa_flags;              /* mostly rt_flags for cloning */
 421         int     ifa_ncnt;               /* # of valid ifaddr_container */
 422         int     ifa_metric;             /* cost of going out this interface */
 423 #ifdef notdef
 424         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 425 #endif
 426         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 427                 (struct ifaddr *, struct sockaddr *);
 428
 429 };
 430 #define IFA_ROUTE       RTF_UP          /* route installed */
 431
 432 /* for compatibility with other BSDs */
 433 #define ifa_list        ifa_link
 434
 435 /*
 436  * The prefix structure contains information about one prefix
 437  * of an interface.  They are maintained by the different address families,
 438  * are allocated and attached when an prefix or an address is set,
 439  * and are linked together so all prefixes for an interface can be located.
 440  */
 441 struct ifprefix {
 442         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 443         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 444         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 445         u_char  ifpr_plen;              /* prefix length in bits */
 446         u_char  ifpr_type;              /* protocol dependent prefix type */
 447 };
 448
 449 /*
 450  * Multicast address structure.  This is analogous to the ifaddr
 451  * structure except that it keeps track of multicast addresses.
 452  * Also, the reference count here is a count of requests for this
 453  * address, not a count of pointers to this structure.
 454  */
 455 struct ifmultiaddr {
 456         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 457         struct  sockaddr *ifma_addr;    /* address this membership is for */
 458         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 459         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 460         u_int   ifma_refcount;          /* reference count */
 461         void    *ifma_protospec;        /* protocol-specific state, if any */
 462 };
 463
 464 #ifdef _KERNEL
 465
 466 enum ifaddr_event {
 467         IFADDR_EVENT_ADD,
 468         IFADDR_EVENT_DELETE,
 469         IFADDR_EVENT_CHANGE
 470 };
 471
 472 /* interface address change event */
 473 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *,
 474         enum ifaddr_event, struct ifaddr *);
 475 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
 476 /* new interface attach event */
 477 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
 478 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
 479 /* interface detach event */
 480 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
 481 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
 482
 483 #ifdef INVARIANTS
 484 #define ASSERT_IFAC_VALID(ifac) do { \
 485         KKASSERT((ifac)->ifa_magic == IFA_CONTAINER_MAGIC); \
 486         KKASSERT((ifac)->ifa_refcnt > 0); \
 487 } while (0)
 488 #else
 489 #define ASSERT_IFAC_VALID(ifac) ((void)0)
 490 #endif
 491
 492 static __inline void
 493 _IFAREF(struct ifaddr *_ifa, int _cpu_id)
 494 {
 495         struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
 496
 497         crit_enter();
 498         ASSERT_IFAC_VALID(_ifac);
 499         ++_ifac->ifa_refcnt;
 500         crit_exit();
 501 }
 502
 503 static __inline void
 504 IFAREF(struct ifaddr *_ifa)
 505 {
 506         _IFAREF(_ifa, mycpuid);
 507 }
 508
 509 #include <sys/malloc.h>
 510
 511 MALLOC_DECLARE(M_IFADDR);
 512 MALLOC_DECLARE(M_IFMADDR);
 513
 514 void    ifac_free(struct ifaddr_container *, int);
 515
 516 static __inline void
 517 _IFAFREE(struct ifaddr *_ifa, int _cpu_id)
 518 {
 519         struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id];
 520
 521         crit_enter();
 522         ASSERT_IFAC_VALID(_ifac);
 523         if (--_ifac->ifa_refcnt == 0)
 524                 ifac_free(_ifac, _cpu_id);
 525         crit_exit();
 526 }
 527
 528 static __inline void
 529 IFAFREE(struct ifaddr *_ifa)
 530 {
 531         _IFAFREE(_ifa, mycpuid);
 532 }
 533
 534 struct lwkt_port *ifnet_portfn(int);
 535 int     ifnet_domsg(struct lwkt_msg *, int);
 536 void    ifnet_sendmsg(struct lwkt_msg *, int);
 537 void    ifnet_forwardmsg(struct lwkt_msg *, int);
 538
 539 static __inline int
 540 ifa_domsg(struct lwkt_msg *_lmsg, int _cpu)
 541 {
 542         return ifnet_domsg(_lmsg, _cpu);
 543 }
 544
 545 static __inline void
 546 ifa_sendmsg(struct lwkt_msg *_lmsg, int _cpu)
 547 {
 548         ifnet_sendmsg(_lmsg, _cpu);
 549 }
 550
 551 static __inline void
 552 ifa_forwardmsg(struct lwkt_msg *_lmsg, int _nextcpu)
 553 {
 554         ifnet_forwardmsg(_lmsg, _nextcpu);
 555 }
 556
 557 extern  struct ifnethead ifnet;
 558 extern struct   ifnet   **ifindex2ifnet;
 559 extern  int ifqmaxlen;
 560 extern  struct ifnet loif[];
 561 extern  int if_index;
 562
 563 void    ether_ifattach(struct ifnet *, uint8_t *, struct lwkt_serialize *);
 564 void    ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int,
 565                         struct lwkt_serialize *);
 566 void    ether_ifdetach(struct ifnet *);
 567 void    ether_demux_oncpu(struct ifnet *, struct mbuf *);
 568 void    ether_input_oncpu(struct ifnet *, struct mbuf *);
 569 void    ether_reinput_oncpu(struct ifnet *, struct mbuf *, int);
 570 void    ether_input_chain(struct ifnet *, struct mbuf *, struct mbuf_chain *);
 571 void    ether_input_chain_init(struct mbuf_chain *);
 572 void    ether_input_dispatch(struct mbuf_chain *);
 573 int     ether_output_frame(struct ifnet *, struct mbuf *);
 574 int     ether_ioctl(struct ifnet *, int, caddr_t);
 575 uint32_t        ether_crc32_le(const uint8_t *, size_t);
 576 uint32_t        ether_crc32_be(const uint8_t *, size_t);
 577
 578 int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
 579 int     if_allmulti(struct ifnet *, int);
 580 void    if_attach(struct ifnet *, struct lwkt_serialize *);
 581 int     if_delmulti(struct ifnet *, struct sockaddr *);
 582 void    if_purgeaddrs_nolink(struct ifnet *);
 583 void    if_detach(struct ifnet *);
 584 void    if_down(struct ifnet *);
 585 void    if_link_state_change(struct ifnet *);
 586 void    if_initname(struct ifnet *, const char *, int);
 587 int     if_getanyethermac(uint16_t *, int);
 588 int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
 589 void    if_route(struct ifnet *, int flag, int fam);
 590 int     if_setlladdr(struct ifnet *, const u_char *, int);
 591 void    if_unroute(struct ifnet *, int flag, int fam);
 592 void    if_up(struct ifnet *);
 593 /*void  ifinit(void);*/ /* declared in systm.h for main() */
 594 int     ifioctl(struct socket *, u_long, caddr_t, struct ucred *);
 595 int     ifpromisc(struct ifnet *, int);
 596 struct  ifnet *ifunit(const char *);
 597 struct  ifnet *if_withname(struct sockaddr *);
 598
 599 struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
 600 struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
 601 struct  ifaddr *ifa_ifwithnet(struct sockaddr *);
 602 struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
 603 struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 604
 605 void    *ifa_create(int, int);
 606 void    ifa_destroy(struct ifaddr *);
 607 void    ifa_iflink(struct ifaddr *, struct ifnet *, int);
 608 void    ifa_ifunlink(struct ifaddr *, struct ifnet *);
 609
 610 struct  ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 611 int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
 612 void    if_devstart(struct ifnet *ifp);
 613
 614 #define IF_LLSOCKADDR(ifp)                                              \
 615     ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
 616 #define IF_LLADDR(ifp)  LLADDR(IF_LLSOCKADDR(ifp))
 617
 618 #ifdef DEVICE_POLLING
 619 typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count);
 620 int     ether_poll_register(struct ifnet *);
 621 int     ether_poll_deregister(struct ifnet *);
 622 int     ether_pollcpu_register(struct ifnet *, int);
 623 #endif /* DEVICE_POLLING */
 624 #endif /* _KERNEL */
 625
 626 #endif /* !_NET_IF_VAR_H_ */