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 1.44 2008/01/11 11:59:40 sephe Exp $
  36  */
  37
  38 #ifndef _NET_IF_VAR_H_
  39 #define _NET_IF_VAR_H_
  40
  41 #ifndef _SYS_SERIALIZE_H_
  42 #include <sys/serialize.h>
  43 #endif
  44 #ifndef _NET_IF_H_
  45 #include <net/if.h>
  46 #endif
  47
  48 /*
  49  * Structures defining a network interface, providing a packet
  50  * transport mechanism (ala level 0 of the PUP protocols).
  51  *
  52  * Each interface accepts output datagrams of a specified maximum
  53  * length, and provides higher level routines with input datagrams
  54  * received from its medium.
  55  *
  56  * Output occurs when the routine if_output is called, with four parameters:
  57  *      ifp->if_output(ifp, m, dst, rt)
  58  * Here m is the mbuf chain to be sent and dst is the destination address.
  59  * The output routine encapsulates the supplied datagram if necessary,
  60  * and then transmits it on its medium.
  61  *
  62  * On input, each interface unwraps the data received by it, and either
  63  * places it on the input queue of a internetwork datagram routine
  64  * and posts the associated software interrupt, or passes the datagram to
  65  * the routine if_input. It is called with the mbuf chain as parameter:
  66  *      ifp->if_input(ifp, m)
  67  * The input routine removes the protocol dependent header if necessary.
  68  *
  69  * Routines exist for locating interfaces by their addresses
  70  * or for locating a interface on a certain network, as well as more general
  71  * routing and gateway routines maintaining information used to locate
  72  * interfaces.  These routines live in the files if.c and route.c
  73  */
  74
  75 /*
  76  * Forward structure declarations for function prototypes [sic].
  77  */
  78 struct  mbuf;
  79 struct  proc;
  80 struct  rtentry;
  81 struct  rt_addrinfo;
  82 struct  socket;
  83 struct  ether_header;
  84 struct  carp_if;
  85 struct  ucred;
  86 struct  lwkt_serialize;
  87
  88 #include <sys/queue.h>          /* get TAILQ macros */
  89
  90 #include <net/altq/if_altq.h>
  91
  92 #ifdef _KERNEL
  93 #include <sys/eventhandler.h>
  94 #include <sys/mbuf.h>
  95 #include <sys/systm.h>          /* XXX */
  96 #include <sys/thread2.h>
  97 #endif /* _KERNEL */
  98
  99 #define IF_DUNIT_NONE   -1
 100
 101 TAILQ_HEAD(ifnethead, ifnet);   /* we use TAILQs so that the order of */
 102 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
 103 TAILQ_HEAD(ifprefixhead, ifprefix);
 104 LIST_HEAD(ifmultihead, ifmultiaddr);
 105
 106 /*
 107  * Structure defining a queue for a network interface.
 108  */
 109 struct  ifqueue {
 110         struct  mbuf *ifq_head;
 111         struct  mbuf *ifq_tail;
 112         int     ifq_len;
 113         int     ifq_maxlen;
 114         int     ifq_drops;
 115 };
 116
 117 /*
 118  * Note of DEVICE_POLLING
 119  * 1) Any file(*.c) that depends on DEVICE_POLLING supports in this
 120  *    file should include opt_polling.h at its beginning.
 121  * 2) When struct changes, which are conditioned by DEVICE_POLLING,
 122  *    are to be introduced, please keep the struct's size and layout
 123  *    same, no matter whether DEVICE_POLLING is defined or not.
 124  *    See ifnet.if_poll and ifnet.if_poll_unused for example.
 125  */
 126
 127 #ifdef DEVICE_POLLING
 128 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER,
 129                 POLL_REGISTER };
 130 #endif
 131
 132 /*
 133  * Structure defining a network interface.
 134  *
 135  * (Would like to call this struct ``if'', but C isn't PL/1.)
 136  */
 137
 138 /*
 139  * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
 140  * one of these structures, typically held within an arpcom structure.
 141  *
 142  *      struct <foo>_softc {
 143  *              struct arpcom {
 144  *                      struct  ifnet ac_if;
 145  *                      ...
 146  *              } <arpcom> ;
 147  *              ...
 148  *      };
 149  *
 150  * The assumption is used in a number of places, including many
 151  * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
 152  *
 153  * Unfortunately devices' softc are opaque, so we depend on this layout
 154  * to locate the struct ifnet from the softc in the generic code.
 155  *
 156  * MPSAFE NOTES:
 157  *
 158  * ifnet and its related packet queues are protected by if_serializer.
 159  * Callers of if_output, if_ioctl, if_start, if_watchdog, if_init,
 160  * if_resolvemulti, and if_poll hold if_serializer.  Device drivers usually
 161  * use the same serializer for their interrupt but this is not required.
 162  * However, the device driver must be holding if_serializer when it
 163  * calls if_input.  Note that the serializer may be temporarily released
 164  * within if_input to avoid a deadlock (e.g. when fast-forwarding or
 165  * bridging packets between interfaces).
 166  *
 167  * If a device driver installs the same serializer for its interrupt
 168  * as for ifnet, then the driver only really needs to worry about further
 169  * serialization in timeout based entry points.  All other entry points
 170  * will already be serialized.  Older ISA drivers still using the old
 171  * interrupt infrastructure will have to obtain and release the serializer
 172  * in their interrupt routine themselves.
 173  */
 174 struct ifnet {
 175         void    *if_softc;              /* pointer to driver state */
 176         TAILQ_ENTRY(ifnet) if_link;     /* all struct ifnets are chained */
 177         char    if_xname[IFNAMSIZ];     /* external name (name + unit) */
 178         const char *if_dname;           /* driver name */
 179         int     if_dunit;               /* unit or IF_DUNIT_NONE */
 180         struct  ifaddrhead if_addrhead; /* linked list of addresses per if */
 181         int     if_pcount;              /* number of promiscuous listeners */
 182         struct  carp_if *if_carp;       /* carp interface structure */
 183         struct  bpf_if *if_bpf;         /* packet filter structure */
 184         u_short if_index;               /* numeric abbreviation for this if  */
 185         short   if_timer;               /* time 'til if_watchdog called */
 186         int     if_flags;               /* up/down, broadcast, etc. */
 187         int     if_capabilities;        /* interface capabilities */
 188         int     if_capenable;           /* enabled features */
 189         void    *if_linkmib;            /* link-type-specific MIB data */
 190         size_t  if_linkmiblen;          /* length of above data */
 191         struct  if_data if_data;
 192         struct  ifmultihead if_multiaddrs; /* multicast addresses configured */
 193         int     if_amcount;             /* number of all-multicast requests */
 194 /* procedure handles */
 195         int     (*if_output)            /* output routine (enqueue) */
 196                 (struct ifnet *, struct mbuf *, struct sockaddr *,
 197                      struct rtentry *);
 198         void    (*if_input)             /* input routine from hardware driver */
 199                 (struct ifnet *, struct mbuf *);
 200         void    (*if_start)             /* initiate output routine */
 201                 (struct ifnet *);
 202         int     (*if_ioctl)             /* ioctl routine */
 203                 (struct ifnet *, u_long, caddr_t, struct ucred *);
 204         void    (*if_watchdog)          /* timer routine */
 205                 (struct ifnet *);
 206         void    (*if_init)              /* Init routine */
 207                 (void *);
 208         int     (*if_resolvemulti)      /* validate/resolve multicast */
 209                 (struct ifnet *, struct sockaddr **, struct sockaddr *);
 210 #ifdef DEVICE_POLLING
 211         void    (*if_poll)              /* IFF_POLLING support */
 212                 (struct ifnet *, enum poll_cmd, int);
 213         int     if_poll_cpuid;
 214 #else
 215         /* Place holders */
 216         void    (*if_poll_unused)(void);
 217         int     if_poll_cpuid_used;
 218 #endif
 219         struct  ifaltq if_snd;          /* output queue (includes altq) */
 220         struct  ifprefixhead if_prefixhead; /* list of prefixes per if */
 221         const uint8_t   *if_broadcastaddr;
 222         void    *if_bridge;             /* bridge glue */
 223         void    *if_afdata[AF_MAX];
 224         struct ifaddr   *if_lladdr;
 225         struct lwkt_serialize *if_serializer;   /* serializer or MP lock */
 226         struct lwkt_serialize if_default_serializer; /* if not supplied */
 227 };
 228 typedef void if_init_f_t (void *);
 229
 230 #define if_mtu          if_data.ifi_mtu
 231 #define if_type         if_data.ifi_type
 232 #define if_physical     if_data.ifi_physical
 233 #define if_addrlen      if_data.ifi_addrlen
 234 #define if_hdrlen       if_data.ifi_hdrlen
 235 #define if_metric       if_data.ifi_metric
 236 #define if_link_state   if_data.ifi_link_state
 237 #define if_baudrate     if_data.ifi_baudrate
 238 #define if_hwassist     if_data.ifi_hwassist
 239 #define if_ipackets     if_data.ifi_ipackets
 240 #define if_ierrors      if_data.ifi_ierrors
 241 #define if_opackets     if_data.ifi_opackets
 242 #define if_oerrors      if_data.ifi_oerrors
 243 #define if_collisions   if_data.ifi_collisions
 244 #define if_ibytes       if_data.ifi_ibytes
 245 #define if_obytes       if_data.ifi_obytes
 246 #define if_imcasts      if_data.ifi_imcasts
 247 #define if_omcasts      if_data.ifi_omcasts
 248 #define if_iqdrops      if_data.ifi_iqdrops
 249 #define if_noproto      if_data.ifi_noproto
 250 #define if_lastchange   if_data.ifi_lastchange
 251 #define if_recvquota    if_data.ifi_recvquota
 252 #define if_xmitquota    if_data.ifi_xmitquota
 253 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
 254
 255 /* for compatibility with other BSDs */
 256 #define if_addrlist     if_addrhead
 257 #define if_list         if_link
 258
 259 /*
 260  * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
 261  * are queues of messages stored on ifqueue structures
 262  * (defined above).  Entries are added to and deleted from these structures
 263  * by these macros, which should be called with ipl raised to splimp().
 264  */
 265 #define IF_QFULL(ifq)           ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
 266 #define IF_DROP(ifq)            ((ifq)->ifq_drops++)
 267 #define IF_QLEN(ifq)            ((ifq)->ifq_len)
 268 #define IF_QEMPTY(ifq)          (IF_QLEN(ifq) == 0)
 269 #define IF_ENQUEUE(ifq, m) { \
 270         (m)->m_nextpkt = 0; \
 271         if ((ifq)->ifq_tail == 0) \
 272                 (ifq)->ifq_head = m; \
 273         else \
 274                 (ifq)->ifq_tail->m_nextpkt = m; \
 275         (ifq)->ifq_tail = m; \
 276         (ifq)->ifq_len++; \
 277 }
 278 #define IF_PREPEND(ifq, m) { \
 279         (m)->m_nextpkt = (ifq)->ifq_head; \
 280         if ((ifq)->ifq_tail == 0) \
 281                 (ifq)->ifq_tail = (m); \
 282         (ifq)->ifq_head = (m); \
 283         (ifq)->ifq_len++; \
 284 }
 285 #define IF_DEQUEUE(ifq, m) { \
 286         (m) = (ifq)->ifq_head; \
 287         if (m) { \
 288                 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
 289                         (ifq)->ifq_tail = 0; \
 290                 (m)->m_nextpkt = 0; \
 291                 (ifq)->ifq_len--; \
 292         } \
 293 }
 294
 295 #define IF_POLL(ifq, m)         ((m) = (ifq)->ifq_head)
 296
 297 #define IF_DRAIN(ifq) do {                                              \
 298         struct mbuf *m;                                                 \
 299         while (1) {                                                     \
 300                 IF_DEQUEUE(ifq, m);                                     \
 301                 if (m == NULL)                                          \
 302                         break;                                          \
 303                 m_freem(m);                                             \
 304         }                                                               \
 305 } while (0)
 306
 307 #ifdef _KERNEL
 308
 309 /*
 310  * DEPRECATED - should not be used by any new driver.  This code uses the
 311  * old queueing interface and if_start ABI and does not use the ifp's
 312  * serializer.
 313  */
 314 #define IF_HANDOFF(ifq, m, ifp)                 if_handoff(ifq, m, ifp, 0)
 315 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj)        if_handoff(ifq, m, ifp, adj)
 316
 317 static __inline int
 318 if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp,
 319            int _adjust)
 320 {
 321         int _need_if_start = 0;
 322
 323         crit_enter();
 324
 325         if (IF_QFULL(_ifq)) {
 326                 IF_DROP(_ifq);
 327                 crit_exit();
 328                 m_freem(_m);
 329                 return (0);
 330         }
 331         if (_ifp != NULL) {
 332                 _ifp->if_obytes += _m->m_pkthdr.len + _adjust;
 333                 if (_m->m_flags & M_MCAST)
 334                         _ifp->if_omcasts++;
 335                 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE);
 336         }
 337         IF_ENQUEUE(_ifq, _m);
 338         if (_need_if_start) {
 339                 (*_ifp->if_start)(_ifp);
 340         }
 341         crit_exit();
 342         return (1);
 343 }
 344
 345 /*
 346  * 72 was chosen below because it is the size of a TCP/IP
 347  * header (40) + the minimum mss (32).
 348  */
 349 #define IF_MINMTU       72
 350 #define IF_MAXMTU       65535
 351
 352 #endif /* _KERNEL */
 353
 354 /*
 355  * The ifaddr structure contains information about one address
 356  * of an interface.  They are maintained by the different address families,
 357  * are allocated and attached when an address is set, and are linked
 358  * together so all addresses for an interface can be located.
 359  */
 360 struct ifaddr {
 361         struct  sockaddr *ifa_addr;     /* address of interface */
 362         struct  sockaddr *ifa_dstaddr;  /* other end of p-to-p link */
 363 #define ifa_broadaddr   ifa_dstaddr     /* broadcast address interface */
 364         struct  sockaddr *ifa_netmask;  /* used to determine subnet */
 365         struct  if_data if_data;        /* not all members are meaningful */
 366         struct  ifnet *ifa_ifp;         /* back-pointer to interface */
 367         TAILQ_ENTRY(ifaddr) ifa_link;   /* queue macro glue */
 368         void    (*ifa_rtrequest)        /* check or clean routes (+ or -)'d */
 369                 (int, struct rtentry *, struct rt_addrinfo *);
 370         u_short ifa_flags;              /* mostly rt_flags for cloning */
 371         u_int   ifa_refcnt;             /* references to this structure */
 372         int     ifa_metric;             /* cost of going out this interface */
 373 #ifdef notdef
 374         struct  rtentry *ifa_rt;        /* XXXX for ROUTETOIF ????? */
 375 #endif
 376         int (*ifa_claim_addr)           /* check if an addr goes to this if */
 377                 (struct ifaddr *, struct sockaddr *);
 378
 379 };
 380 #define IFA_ROUTE       RTF_UP          /* route installed */
 381
 382 /* for compatibility with other BSDs */
 383 #define ifa_list        ifa_link
 384
 385 /*
 386  * The prefix structure contains information about one prefix
 387  * of an interface.  They are maintained by the different address families,
 388  * are allocated and attached when an prefix or an address is set,
 389  * and are linked together so all prefixes for an interface can be located.
 390  */
 391 struct ifprefix {
 392         struct  sockaddr *ifpr_prefix;  /* prefix of interface */
 393         struct  ifnet *ifpr_ifp;        /* back-pointer to interface */
 394         TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
 395         u_char  ifpr_plen;              /* prefix length in bits */
 396         u_char  ifpr_type;              /* protocol dependent prefix type */
 397 };
 398
 399 /*
 400  * Multicast address structure.  This is analogous to the ifaddr
 401  * structure except that it keeps track of multicast addresses.
 402  * Also, the reference count here is a count of requests for this
 403  * address, not a count of pointers to this structure.
 404  */
 405 struct ifmultiaddr {
 406         LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
 407         struct  sockaddr *ifma_addr;    /* address this membership is for */
 408         struct  sockaddr *ifma_lladdr;  /* link-layer translation, if any */
 409         struct  ifnet *ifma_ifp;        /* back-pointer to interface */
 410         u_int   ifma_refcount;          /* reference count */
 411         void    *ifma_protospec;        /* protocol-specific state, if any */
 412 };
 413
 414 #ifdef _KERNEL
 415 /* interface address change event */
 416 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
 417 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
 418 /* new interface attach event */
 419 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
 420 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
 421 /* interface detach event */
 422 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
 423 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
 424
 425 static __inline void
 426 IFAREF(struct ifaddr *_ifa)
 427 {
 428         ++_ifa->ifa_refcnt;
 429 }
 430
 431 #include <sys/malloc.h>
 432
 433 MALLOC_DECLARE(M_IFADDR);
 434 MALLOC_DECLARE(M_IFMADDR);
 435
 436 static __inline void
 437 IFAFREE(struct ifaddr *_ifa)
 438 {
 439         if (_ifa->ifa_refcnt <= 0)
 440                 kfree(_ifa, M_IFADDR);
 441         else
 442                 _ifa->ifa_refcnt--;
 443 }
 444
 445 extern  struct ifnethead ifnet;
 446 extern struct   ifnet   **ifindex2ifnet;
 447 extern  int ifqmaxlen;
 448 extern  struct ifnet loif[];
 449 extern  int if_index;
 450
 451 void    ether_ifattach(struct ifnet *, uint8_t *, struct lwkt_serialize *);
 452 void    ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int,
 453                         struct lwkt_serialize *);
 454 void    ether_ifdetach(struct ifnet *);
 455 void    ether_input(struct ifnet *, struct mbuf *);
 456 void    ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
 457 int     ether_output_frame(struct ifnet *, struct mbuf *);
 458 int     ether_ioctl(struct ifnet *, int, caddr_t);
 459 uint32_t        ether_crc32_le(const uint8_t *, size_t);
 460 uint32_t        ether_crc32_be(const uint8_t *, size_t);
 461
 462 int     if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
 463 int     if_allmulti(struct ifnet *, int);
 464 void    if_attach(struct ifnet *, struct lwkt_serialize *);
 465 int     if_delmulti(struct ifnet *, struct sockaddr *);
 466 void    if_purgeaddrs_nolink(struct ifnet *);
 467 void    if_detach(struct ifnet *);
 468 void    if_down(struct ifnet *);
 469 void    if_link_state_change(struct ifnet *);
 470 void    if_initname(struct ifnet *, const char *, int);
 471 int     if_getanyethermac(uint16_t *, int);
 472 int     if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
 473 void    if_route(struct ifnet *, int flag, int fam);
 474 int     if_setlladdr(struct ifnet *, const u_char *, int);
 475 void    if_unroute(struct ifnet *, int flag, int fam);
 476 void    if_up(struct ifnet *);
 477 /*void  ifinit(void);*/ /* declared in systm.h for main() */
 478 int     ifioctl(struct socket *, u_long, caddr_t, struct ucred *);
 479 int     ifpromisc(struct ifnet *, int);
 480 struct  ifnet *ifunit(const char *);
 481 struct  ifnet *if_withname(struct sockaddr *);
 482
 483 struct  ifaddr *ifa_ifwithaddr(struct sockaddr *);
 484 struct  ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
 485 struct  ifaddr *ifa_ifwithnet(struct sockaddr *);
 486 struct  ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
 487 struct  ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 488
 489 struct  ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
 490 int     if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
 491
 492 #define IF_LLSOCKADDR(ifp)                                              \
 493     ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
 494 #define IF_LLADDR(ifp)  LLADDR(IF_LLSOCKADDR(ifp))
 495
 496 #ifdef DEVICE_POLLING
 497 typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count);
 498 int     ether_poll_register(struct ifnet *);
 499 int     ether_poll_deregister(struct ifnet *);
 500 int     ether_pollcpu_register(struct ifnet *, int);
 501 #endif /* DEVICE_POLLING */
 502 #endif /* _KERNEL */
 503
 504 #endif /* !_NET_IF_VAR_H_ */