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 1.48 2008/03/20 12:55:32 sephe Exp $ 36 */ 37 38 #ifndef _NET_IF_VAR_H_ 39 #define _NET_IF_VAR_H_ 40 41 #ifndef _SYS_SERIALIZE_H_ 42 #include <sys/serialize.h> 43 #endif 44 #ifndef _NET_IF_H_ 45 #include <net/if.h> 46 #endif 47 48 /* 49 * Structures defining a network interface, providing a packet 50 * transport mechanism (ala level 0 of the PUP protocols). 51 * 52 * Each interface accepts output datagrams of a specified maximum 53 * length, and provides higher level routines with input datagrams 54 * received from its medium. 55 * 56 * Output occurs when the routine if_output is called, with four parameters: 57 * ifp->if_output(ifp, m, dst, rt) 58 * Here m is the mbuf chain to be sent and dst is the destination address. 59 * The output routine encapsulates the supplied datagram if necessary, 60 * and then transmits it on its medium. 61 * 62 * On input, each interface unwraps the data received by it, and either 63 * places it on the input queue of a internetwork datagram routine 64 * and posts the associated software interrupt, or passes the datagram to 65 * the routine if_input. It is called with the mbuf chain as parameter: 66 * ifp->if_input(ifp, m) 67 * The input routine removes the protocol dependent header if necessary. 68 * 69 * Routines exist for locating interfaces by their addresses 70 * or for locating a interface on a certain network, as well as more general 71 * routing and gateway routines maintaining information used to locate 72 * interfaces. These routines live in the files if.c and route.c 73 */ 74 75 /* 76 * Forward structure declarations for function prototypes [sic]. 77 */ 78 struct mbuf; 79 struct proc; 80 struct rtentry; 81 struct rt_addrinfo; 82 struct socket; 83 struct ether_header; 84 struct carp_if; 85 struct ucred; 86 struct lwkt_serialize; 87 struct ifaddr_container; 88 struct ifaddr; 89 struct lwkt_port; 90 91 #include <sys/queue.h> /* get TAILQ macros */ 92 93 #include <net/altq/if_altq.h> 94 95 #ifdef _KERNEL 96 #include <sys/eventhandler.h> 97 #include <sys/mbuf.h> 98 #include <sys/systm.h> /* XXX */ 99 #include <sys/thread2.h> 100 #endif /* _KERNEL */ 101 102 #define IF_DUNIT_NONE -1 103 104 TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 105 TAILQ_HEAD(ifaddrhead, ifaddr_container); /* instantiation is preserved in the list */ 106 TAILQ_HEAD(ifprefixhead, ifprefix); 107 LIST_HEAD(ifmultihead, ifmultiaddr); 108 109 /* 110 * Structure defining a queue for a network interface. 111 */ 112 struct ifqueue { 113 struct mbuf *ifq_head; 114 struct mbuf *ifq_tail; 115 int ifq_len; 116 int ifq_maxlen; 117 int ifq_drops; 118 }; 119 120 /* 121 * Note of DEVICE_POLLING 122 * 1) Any file(*.c) that depends on DEVICE_POLLING supports in this 123 * file should include opt_polling.h at its beginning. 124 * 2) When struct changes, which are conditioned by DEVICE_POLLING, 125 * are to be introduced, please keep the struct's size and layout 126 * same, no matter whether DEVICE_POLLING is defined or not. 127 * See ifnet.if_poll and ifnet.if_poll_unused for example. 128 */ 129 130 #ifdef DEVICE_POLLING 131 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER, 132 POLL_REGISTER }; 133 #endif 134 135 /* 136 * Structure defining a network interface. 137 * 138 * (Would like to call this struct ``if'', but C isn't PL/1.) 139 */ 140 141 /* 142 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with 143 * one of these structures, typically held within an arpcom structure. 144 * 145 * struct <foo>_softc { 146 * struct arpcom { 147 * struct ifnet ac_if; 148 * ... 149 * } <arpcom> ; 150 * ... 151 * }; 152 * 153 * The assumption is used in a number of places, including many 154 * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach(). 155 * 156 * Unfortunately devices' softc are opaque, so we depend on this layout 157 * to locate the struct ifnet from the softc in the generic code. 158 * 159 * MPSAFE NOTES: 160 * 161 * ifnet and its related packet queues are protected by if_serializer. 162 * Callers of if_output, if_ioctl, if_start, if_watchdog, if_init, 163 * if_resolvemulti, and if_poll hold if_serializer. Device drivers usually 164 * use the same serializer for their interrupt but this is not required. 165 * However, the device driver must be holding if_serializer when it 166 * calls if_input. Note that the serializer may be temporarily released 167 * within if_input to avoid a deadlock (e.g. when fast-forwarding or 168 * bridging packets between interfaces). 169 * 170 * If a device driver installs the same serializer for its interrupt 171 * as for ifnet, then the driver only really needs to worry about further 172 * serialization in timeout based entry points. All other entry points 173 * will already be serialized. Older ISA drivers still using the old 174 * interrupt infrastructure will have to obtain and release the serializer 175 * in their interrupt routine themselves. 176 */ 177 struct ifnet { 178 void *if_softc; /* pointer to driver state */ 179 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 180 char if_xname[IFNAMSIZ]; /* external name (name + unit) */ 181 const char *if_dname; /* driver name */ 182 int if_dunit; /* unit or IF_DUNIT_NONE */ 183 void *if_vlantrunks; /* vlan trunks */ 184 struct ifaddrhead *if_addrheads; /* linked lists of addresses per if */ 185 int if_pcount; /* number of promiscuous listeners */ 186 struct carp_if *if_carp; /* carp interface structure */ 187 struct bpf_if *if_bpf; /* packet filter structure */ 188 u_short if_index; /* numeric abbreviation for this if */ 189 short if_timer; /* time 'til if_watchdog called */ 190 int if_flags; /* up/down, broadcast, etc. */ 191 int if_capabilities; /* interface capabilities */ 192 int if_capenable; /* enabled features */ 193 void *if_linkmib; /* link-type-specific MIB data */ 194 size_t if_linkmiblen; /* length of above data */ 195 struct if_data if_data; 196 struct ifmultihead if_multiaddrs; /* multicast addresses configured */ 197 int if_amcount; /* number of all-multicast requests */ 198 /* procedure handles */ 199 int (*if_output) /* output routine (enqueue) */ 200 (struct ifnet *, struct mbuf *, struct sockaddr *, 201 struct rtentry *); 202 void (*if_input) /* input routine from hardware driver */ 203 (struct ifnet *, struct mbuf *); 204 void (*if_start) /* initiate output routine */ 205 (struct ifnet *); 206 int (*if_ioctl) /* ioctl routine */ 207 (struct ifnet *, u_long, caddr_t, struct ucred *); 208 void (*if_watchdog) /* timer routine */ 209 (struct ifnet *); 210 void (*if_init) /* Init routine */ 211 (void *); 212 int (*if_resolvemulti) /* validate/resolve multicast */ 213 (struct ifnet *, struct sockaddr **, struct sockaddr *); 214 #ifdef DEVICE_POLLING 215 void (*if_poll) /* IFF_POLLING support */ 216 (struct ifnet *, enum poll_cmd, int); 217 int if_poll_cpuid; 218 #else 219 /* Place holders */ 220 void (*if_poll_unused)(void); 221 int if_poll_cpuid_used; 222 #endif 223 struct ifaltq if_snd; /* output queue (includes altq) */ 224 struct ifprefixhead if_prefixhead; /* list of prefixes per if */ 225 const uint8_t *if_broadcastaddr; 226 void *if_bridge; /* bridge glue */ 227 void *if_afdata[AF_MAX]; 228 struct ifaddr *if_lladdr; 229 struct lwkt_serialize *if_serializer; /* serializer or MP lock */ 230 struct lwkt_serialize if_default_serializer; /* if not supplied */ 231 }; 232 typedef void if_init_f_t (void *); 233 234 #define if_mtu if_data.ifi_mtu 235 #define if_type if_data.ifi_type 236 #define if_physical if_data.ifi_physical 237 #define if_addrlen if_data.ifi_addrlen 238 #define if_hdrlen if_data.ifi_hdrlen 239 #define if_metric if_data.ifi_metric 240 #define if_link_state if_data.ifi_link_state 241 #define if_baudrate if_data.ifi_baudrate 242 #define if_hwassist if_data.ifi_hwassist 243 #define if_ipackets if_data.ifi_ipackets 244 #define if_ierrors if_data.ifi_ierrors 245 #define if_opackets if_data.ifi_opackets 246 #define if_oerrors if_data.ifi_oerrors 247 #define if_collisions if_data.ifi_collisions 248 #define if_ibytes if_data.ifi_ibytes 249 #define if_obytes if_data.ifi_obytes 250 #define if_imcasts if_data.ifi_imcasts 251 #define if_omcasts if_data.ifi_omcasts 252 #define if_iqdrops if_data.ifi_iqdrops 253 #define if_noproto if_data.ifi_noproto 254 #define if_lastchange if_data.ifi_lastchange 255 #define if_recvquota if_data.ifi_recvquota 256 #define if_xmitquota if_data.ifi_xmitquota 257 #define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0) 258 259 /* for compatibility with other BSDs */ 260 #define if_list if_link 261 262 263 /* 264 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 265 * are queues of messages stored on ifqueue structures 266 * (defined above). Entries are added to and deleted from these structures 267 * by these macros, which should be called with ipl raised to splimp(). 268 */ 269 #define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 270 #define IF_DROP(ifq) ((ifq)->ifq_drops++) 271 #define IF_QLEN(ifq) ((ifq)->ifq_len) 272 #define IF_QEMPTY(ifq) (IF_QLEN(ifq) == 0) 273 #define IF_ENQUEUE(ifq, m) do { \ 274 (m)->m_nextpkt = 0; \ 275 if ((ifq)->ifq_tail == 0) \ 276 (ifq)->ifq_head = m; \ 277 else \ 278 (ifq)->ifq_tail->m_nextpkt = m; \ 279 (ifq)->ifq_tail = m; \ 280 (ifq)->ifq_len++; \ 281 } while (0) 282 #define IF_PREPEND(ifq, m) do { \ 283 (m)->m_nextpkt = (ifq)->ifq_head; \ 284 if ((ifq)->ifq_tail == 0) \ 285 (ifq)->ifq_tail = (m); \ 286 (ifq)->ifq_head = (m); \ 287 (ifq)->ifq_len++; \ 288 } while (0) 289 #define IF_DEQUEUE(ifq, m) do { \ 290 (m) = (ifq)->ifq_head; \ 291 if (m) { \ 292 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 293 (ifq)->ifq_tail = 0; \ 294 (m)->m_nextpkt = 0; \ 295 (ifq)->ifq_len--; \ 296 } \ 297 } while (0) 298 299 #define IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 300 301 #define IF_DRAIN(ifq) do { \ 302 struct mbuf *m; \ 303 while (1) { \ 304 IF_DEQUEUE(ifq, m); \ 305 if (m == NULL) \ 306 break; \ 307 m_freem(m); \ 308 } \ 309 } while (0) 310 311 #ifdef _KERNEL 312 313 /* 314 * DEPRECATED - should not be used by any new driver. This code uses the 315 * old queueing interface and if_start ABI and does not use the ifp's 316 * serializer. 317 */ 318 #define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0) 319 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj) 320 321 static __inline int 322 if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp, 323 int _adjust) 324 { 325 int _need_if_start = 0; 326 327 crit_enter(); 328 329 if (IF_QFULL(_ifq)) { 330 IF_DROP(_ifq); 331 crit_exit(); 332 m_freem(_m); 333 return (0); 334 } 335 if (_ifp != NULL) { 336 _ifp->if_obytes += _m->m_pkthdr.len + _adjust; 337 if (_m->m_flags & M_MCAST) 338 _ifp->if_omcasts++; 339 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE); 340 } 341 IF_ENQUEUE(_ifq, _m); 342 if (_need_if_start) { 343 (*_ifp->if_start)(_ifp); 344 } 345 crit_exit(); 346 return (1); 347 } 348 349 /* 350 * 72 was chosen below because it is the size of a TCP/IP 351 * header (40) + the minimum mss (32). 352 */ 353 #define IF_MINMTU 72 354 #define IF_MAXMTU 65535 355 356 #endif /* _KERNEL */ 357 358 struct ifaddr_container { 359 #define IFA_CONTAINER_MAGIC 0x19810219 360 #define IFA_CONTAINER_DEAD 0xc0dedead 361 uint32_t ifa_magic; /* IFA_CONTAINER_MAGIC */ 362 struct ifaddr *ifa; 363 TAILQ_ENTRY(ifaddr_container) ifa_link; /* queue macro glue */ 364 u_int ifa_refcnt; /* references to this structure */ 365 }; 366 367 /* 368 * The ifaddr structure contains information about one address 369 * of an interface. They are maintained by the different address families, 370 * are allocated and attached when an address is set, and are linked 371 * together so all addresses for an interface can be located. 372 */ 373 struct ifaddr { 374 struct sockaddr *ifa_addr; /* address of interface */ 375 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 376 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 377 struct sockaddr *ifa_netmask; /* used to determine subnet */ 378 struct if_data if_data; /* not all members are meaningful */ 379 struct ifnet *ifa_ifp; /* back-pointer to interface */ 380 void *ifa_link_pad; 381 struct ifaddr_container *ifa_containers; 382 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 383 (int, struct rtentry *, struct rt_addrinfo *); 384 u_short ifa_flags; /* mostly rt_flags for cloning */ 385 cpumask_t ifa_cpumask; 386 int ifa_metric; /* cost of going out this interface */ 387 #ifdef notdef 388 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */ 389 #endif 390 int (*ifa_claim_addr) /* check if an addr goes to this if */ 391 (struct ifaddr *, struct sockaddr *); 392 393 }; 394 #define IFA_ROUTE RTF_UP /* route installed */ 395 396 /* for compatibility with other BSDs */ 397 #define ifa_list ifa_link 398 399 /* 400 * The prefix structure contains information about one prefix 401 * of an interface. They are maintained by the different address families, 402 * are allocated and attached when an prefix or an address is set, 403 * and are linked together so all prefixes for an interface can be located. 404 */ 405 struct ifprefix { 406 struct sockaddr *ifpr_prefix; /* prefix of interface */ 407 struct ifnet *ifpr_ifp; /* back-pointer to interface */ 408 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */ 409 u_char ifpr_plen; /* prefix length in bits */ 410 u_char ifpr_type; /* protocol dependent prefix type */ 411 }; 412 413 /* 414 * Multicast address structure. This is analogous to the ifaddr 415 * structure except that it keeps track of multicast addresses. 416 * Also, the reference count here is a count of requests for this 417 * address, not a count of pointers to this structure. 418 */ 419 struct ifmultiaddr { 420 LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 421 struct sockaddr *ifma_addr; /* address this membership is for */ 422 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 423 struct ifnet *ifma_ifp; /* back-pointer to interface */ 424 u_int ifma_refcount; /* reference count */ 425 void *ifma_protospec; /* protocol-specific state, if any */ 426 }; 427 428 #ifdef _KERNEL 429 /* interface address change event */ 430 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 431 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 432 /* new interface attach event */ 433 typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *); 434 EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t); 435 /* interface detach event */ 436 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *); 437 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t); 438 439 static __inline void 440 _IFAREF(struct ifaddr *_ifa, int _cpu_id) 441 { 442 struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id]; 443 444 crit_enter(); 445 KKASSERT(_ifac->ifa_magic == IFA_CONTAINER_MAGIC); 446 ++_ifac->ifa_refcnt; 447 crit_exit(); 448 } 449 450 static __inline void 451 IFAREF(struct ifaddr *_ifa) 452 { 453 _IFAREF(_ifa, mycpuid); 454 } 455 456 #include <sys/malloc.h> 457 458 MALLOC_DECLARE(M_IFADDR); 459 MALLOC_DECLARE(M_IFMADDR); 460 461 void ifac_free(struct ifaddr_container *, int); 462 463 static __inline void 464 _IFAFREE(struct ifaddr *_ifa, int _cpu_id) 465 { 466 struct ifaddr_container *_ifac = &_ifa->ifa_containers[_cpu_id]; 467 468 crit_enter(); 469 KKASSERT(_ifac->ifa_magic == IFA_CONTAINER_MAGIC); 470 KKASSERT(_ifac->ifa_refcnt > 0); 471 if (--_ifac->ifa_refcnt == 0) 472 ifac_free(_ifac, _cpu_id); 473 crit_exit(); 474 } 475 476 static __inline void 477 IFAFREE(struct ifaddr *_ifa) 478 { 479 _IFAFREE(_ifa, mycpuid); 480 } 481 482 extern struct ifnethead ifnet; 483 extern struct ifnet **ifindex2ifnet; 484 extern int ifqmaxlen; 485 extern struct ifnet loif[]; 486 extern int if_index; 487 488 void ether_ifattach(struct ifnet *, uint8_t *, struct lwkt_serialize *); 489 void ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int, 490 struct lwkt_serialize *); 491 void ether_ifdetach(struct ifnet *); 492 void ether_input(struct ifnet *, struct mbuf *); 493 void ether_demux(struct ifnet *, struct mbuf *); 494 int ether_output_frame(struct ifnet *, struct mbuf *); 495 int ether_ioctl(struct ifnet *, int, caddr_t); 496 uint32_t ether_crc32_le(const uint8_t *, size_t); 497 uint32_t ether_crc32_be(const uint8_t *, size_t); 498 499 int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 500 int if_allmulti(struct ifnet *, int); 501 void if_attach(struct ifnet *, struct lwkt_serialize *); 502 int if_delmulti(struct ifnet *, struct sockaddr *); 503 void if_purgeaddrs_nolink(struct ifnet *); 504 void if_detach(struct ifnet *); 505 void if_down(struct ifnet *); 506 void if_link_state_change(struct ifnet *); 507 void if_initname(struct ifnet *, const char *, int); 508 int if_getanyethermac(uint16_t *, int); 509 int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 510 void if_route(struct ifnet *, int flag, int fam); 511 int if_setlladdr(struct ifnet *, const u_char *, int); 512 void if_unroute(struct ifnet *, int flag, int fam); 513 void if_up(struct ifnet *); 514 /*void ifinit(void);*/ /* declared in systm.h for main() */ 515 int ifioctl(struct socket *, u_long, caddr_t, struct ucred *); 516 int ifpromisc(struct ifnet *, int); 517 struct ifnet *ifunit(const char *); 518 struct ifnet *if_withname(struct sockaddr *); 519 520 struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 521 struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 522 struct ifaddr *ifa_ifwithnet(struct sockaddr *); 523 struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 524 struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 525 526 void *ifa_create(int, int); 527 void ifa_destroy(struct ifaddr *); 528 void ifa_iflink(struct ifaddr *, struct ifnet *, int); 529 void ifa_ifunlink(struct ifaddr *, struct ifnet *); 530 struct lwkt_port *ifa_portfn(int); 531 532 struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *); 533 int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 534 535 #define IF_LLSOCKADDR(ifp) \ 536 ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr) 537 #define IF_LLADDR(ifp) LLADDR(IF_LLSOCKADDR(ifp)) 538 539 #ifdef DEVICE_POLLING 540 typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count); 541 int ether_poll_register(struct ifnet *); 542 int ether_poll_deregister(struct ifnet *); 543 int ether_pollcpu_register(struct ifnet *, int); 544 #endif /* DEVICE_POLLING */ 545 #endif /* _KERNEL */ 546 547 #endif /* !_NET_IF_VAR_H_ */ 548