if_var.h revision 130585
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: head/sys/net/if_var.h 130585 2004-06-16 09:47:26Z phk $ 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 */ 65struct mbuf; 66struct thread; 67struct rtentry; 68struct rt_addrinfo; 69struct socket; 70struct ether_header; 71#endif 72 73#include <sys/queue.h> /* get TAILQ macros */ 74 75#ifdef _KERNEL 76#include <sys/mbuf.h> 77#include <sys/eventhandler.h> 78#endif /* _KERNEL */ 79#include <sys/lock.h> /* XXX */ 80#include <sys/mutex.h> /* XXX */ 81#include <sys/event.h> /* XXX */ 82 83#define IF_DUNIT_NONE -1 84 85#if 1 /* ALTQ */ 86#include <altq/if_altq.h> 87#endif 88 89TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 90TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */ 91TAILQ_HEAD(ifprefixhead, ifprefix); 92TAILQ_HEAD(ifmultihead, ifmultiaddr); 93 94/* 95 * Structure defining a queue for a network interface. 96 */ 97struct ifqueue { 98 struct mbuf *ifq_head; 99 struct mbuf *ifq_tail; 100 int ifq_len; 101 int ifq_maxlen; 102 int ifq_drops; 103 struct mtx ifq_mtx; 104}; 105 106/* 107 * Structure defining a network interface. 108 * 109 * (Would like to call this struct ``if'', but C isn't PL/1.) 110 */ 111 112/* 113 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with 114 * one of these structures, typically held within an arpcom structure. 115 * 116 * struct <foo>_softc { 117 * struct arpcom { 118 * struct ifnet ac_if; 119 * ... 120 * } <arpcom> ; 121 * ... 122 * }; 123 * 124 * The assumption is used in a number of places, including many 125 * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach(). 126 * 127 * Unfortunately devices' softc are opaque, so we depend on this layout 128 * to locate the struct ifnet from the softc in the generic code. 129 * 130 */ 131struct ifnet { 132 void *if_softc; /* pointer to driver state */ 133 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 134 char if_xname[IFNAMSIZ]; /* external name (name + unit) */ 135 const char *if_dname; /* driver name */ 136 int if_dunit; /* unit or IF_DUNIT_NONE */ 137 struct ifaddrhead if_addrhead; /* linked list of addresses per if */ 138 /* 139 * if_addrhead is the list of all addresses associated to 140 * an interface. 141 * Some code in the kernel assumes that first element 142 * of the list has type AF_LINK, and contains sockaddr_dl 143 * addresses which store the link-level address and the name 144 * of the interface. 145 * However, access to the AF_LINK address through this 146 * field is deprecated. Use ifaddr_byindex() instead. 147 */ 148 struct klist if_klist; /* events attached to this if */ 149 int if_pcount; /* number of promiscuous listeners */ 150 struct bpf_if *if_bpf; /* packet filter structure */ 151 u_short if_index; /* numeric abbreviation for this if */ 152 short if_timer; /* time 'til if_watchdog called */ 153 u_short if_nvlans; /* number of active vlans */ 154 int if_flags; /* up/down, broadcast, etc. */ 155 int if_capabilities; /* interface capabilities */ 156 int if_capenable; /* enabled features */ 157 void *if_linkmib; /* link-type-specific MIB data */ 158 size_t if_linkmiblen; /* length of above data */ 159 struct if_data if_data; 160 struct ifmultihead if_multiaddrs; /* multicast addresses configured */ 161 int if_amcount; /* number of all-multicast requests */ 162/* procedure handles */ 163 int (*if_output) /* output routine (enqueue) */ 164 (struct ifnet *, struct mbuf *, struct sockaddr *, 165 struct rtentry *); 166 void (*if_input) /* input routine (from h/w driver) */ 167 (struct ifnet *, struct mbuf *); 168 void (*if_start) /* initiate output routine */ 169 (struct ifnet *); 170 int (*if_ioctl) /* ioctl routine */ 171 (struct ifnet *, u_long, caddr_t); 172 void (*if_watchdog) /* timer routine */ 173 (struct ifnet *); 174 void (*if_init) /* Init routine */ 175 (void *); 176 int (*if_resolvemulti) /* validate/resolve multicast */ 177 (struct ifnet *, struct sockaddr **, struct sockaddr *); 178#if 1 /* ALTQ */ 179 struct ifaltq if_snd; /* output queue (includes altq) */ 180#else 181 struct ifqueue if_snd; /* output queue */ 182#endif 183 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */ 184 185 struct lltable *lltables; /* list of L3-L2 resolution tables */ 186 187 struct label *if_label; /* interface MAC label */ 188 189 /* these are only used by IPv6 */ 190 struct ifprefixhead if_prefixhead; /* list of prefixes per if */ 191 void *if_afdata[AF_MAX]; 192 int if_afdata_initialized; 193 struct mtx if_afdata_mtx; 194}; 195 196typedef void if_init_f_t(void *); 197 198/* 199 * XXX These aliases are terribly dangerous because they could apply 200 * to anything. 201 */ 202#define if_mtu if_data.ifi_mtu 203#define if_type if_data.ifi_type 204#define if_physical if_data.ifi_physical 205#define if_addrlen if_data.ifi_addrlen 206#define if_hdrlen if_data.ifi_hdrlen 207#define if_metric if_data.ifi_metric 208#define if_link_state if_data.ifi_link_state 209#define if_baudrate if_data.ifi_baudrate 210#define if_hwassist if_data.ifi_hwassist 211#define if_ipackets if_data.ifi_ipackets 212#define if_ierrors if_data.ifi_ierrors 213#define if_opackets if_data.ifi_opackets 214#define if_oerrors if_data.ifi_oerrors 215#define if_collisions if_data.ifi_collisions 216#define if_ibytes if_data.ifi_ibytes 217#define if_obytes if_data.ifi_obytes 218#define if_imcasts if_data.ifi_imcasts 219#define if_omcasts if_data.ifi_omcasts 220#define if_iqdrops if_data.ifi_iqdrops 221#define if_noproto if_data.ifi_noproto 222#define if_lastchange if_data.ifi_lastchange 223#define if_recvquota if_data.ifi_recvquota 224#define if_xmitquota if_data.ifi_xmitquota 225#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0) 226 227/* for compatibility with other BSDs */ 228#define if_addrlist if_addrhead 229#define if_list if_link 230 231/* 232 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 233 * are queues of messages stored on ifqueue structures 234 * (defined above). Entries are added to and deleted from these structures 235 * by these macros, which should be called with ipl raised to splimp(). 236 */ 237#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 238#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 239#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 240#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 241#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 242#define _IF_QLEN(ifq) ((ifq)->ifq_len) 243 244#define _IF_ENQUEUE(ifq, m) do { \ 245 (m)->m_nextpkt = NULL; \ 246 if ((ifq)->ifq_tail == NULL) \ 247 (ifq)->ifq_head = m; \ 248 else \ 249 (ifq)->ifq_tail->m_nextpkt = m; \ 250 (ifq)->ifq_tail = m; \ 251 (ifq)->ifq_len++; \ 252} while (0) 253 254#define IF_ENQUEUE(ifq, m) do { \ 255 IF_LOCK(ifq); \ 256 _IF_ENQUEUE(ifq, m); \ 257 IF_UNLOCK(ifq); \ 258} while (0) 259 260#define _IF_PREPEND(ifq, m) do { \ 261 (m)->m_nextpkt = (ifq)->ifq_head; \ 262 if ((ifq)->ifq_tail == NULL) \ 263 (ifq)->ifq_tail = (m); \ 264 (ifq)->ifq_head = (m); \ 265 (ifq)->ifq_len++; \ 266} while (0) 267 268#define IF_PREPEND(ifq, m) do { \ 269 IF_LOCK(ifq); \ 270 _IF_PREPEND(ifq, m); \ 271 IF_UNLOCK(ifq); \ 272} while (0) 273 274#define _IF_DEQUEUE(ifq, m) do { \ 275 (m) = (ifq)->ifq_head; \ 276 if (m) { \ 277 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \ 278 (ifq)->ifq_tail = NULL; \ 279 (m)->m_nextpkt = NULL; \ 280 (ifq)->ifq_len--; \ 281 } \ 282} while (0) 283 284#define IF_DEQUEUE(ifq, m) do { \ 285 IF_LOCK(ifq); \ 286 _IF_DEQUEUE(ifq, m); \ 287 IF_UNLOCK(ifq); \ 288} while (0) 289 290#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 291#define IF_POLL(ifq, m) _IF_POLL(ifq, m) 292 293#define _IF_DRAIN(ifq) do { \ 294 struct mbuf *m; \ 295 for (;;) { \ 296 _IF_DEQUEUE(ifq, m); \ 297 if (m == NULL) \ 298 break; \ 299 m_freem(m); \ 300 } \ 301} while (0) 302 303#define IF_DRAIN(ifq) do { \ 304 IF_LOCK(ifq); \ 305 _IF_DRAIN(ifq); \ 306 IF_UNLOCK(ifq); \ 307} while(0) 308 309#ifdef _KERNEL 310/* interface address change event */ 311typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 312EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 313/* new interface arrival event */ 314typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 315EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 316/* interface departure event */ 317typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 318EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 319/* interface clone event */ 320typedef void (*if_clone_event_handler_t)(void *, struct if_clone *); 321EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t); 322 323#define IF_AFDATA_LOCK_INIT(ifp) \ 324 mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF) 325#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx) 326#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx) 327#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx) 328#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx) 329 330#define IF_HANDOFF(ifq, m, ifp) \ 331 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 332#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 333 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 334 335static __inline int 336if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 337{ 338 int active = 0; 339 340 IF_LOCK(ifq); 341 if (_IF_QFULL(ifq)) { 342 _IF_DROP(ifq); 343 IF_UNLOCK(ifq); 344 m_freem(m); 345 return (0); 346 } 347 if (ifp != NULL) { 348 ifp->if_obytes += m->m_pkthdr.len + adjust; 349 if (m->m_flags & (M_BCAST|M_MCAST)) 350 ifp->if_omcasts++; 351 active = ifp->if_flags & IFF_OACTIVE; 352 } 353 _IF_ENQUEUE(ifq, m); 354 IF_UNLOCK(ifq); 355 if (ifp != NULL && !active) 356 (*ifp->if_start)(ifp); 357 return (1); 358} 359#if 1 /* ALTQ */ 360#define IFQ_ENQUEUE(ifq, m, err) \ 361do { \ 362 IF_LOCK(ifq); \ 363 if (ALTQ_IS_ENABLED(ifq)) \ 364 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 365 else { \ 366 if (_IF_QFULL(ifq)) { \ 367 m_freem(m); \ 368 (err) = ENOBUFS; \ 369 } else { \ 370 _IF_ENQUEUE(ifq, m); \ 371 (err) = 0; \ 372 } \ 373 } \ 374 if (err) \ 375 (ifq)->ifq_drops++; \ 376 IF_UNLOCK(ifq); \ 377} while (0) 378 379#define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 380do { \ 381 if (TBR_IS_ENABLED(ifq)) \ 382 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 383 else if (ALTQ_IS_ENABLED(ifq)) \ 384 ALTQ_DEQUEUE(ifq, m); \ 385 else \ 386 _IF_DEQUEUE(ifq, m); \ 387} while (0) 388 389#define IFQ_DEQUEUE(ifq, m) \ 390do { \ 391 IF_LOCK(ifq); \ 392 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 393 IF_UNLOCK(ifq); \ 394} while (0) 395 396#define IFQ_POLL_NOLOCK(ifq, m) \ 397do { \ 398 if (TBR_IS_ENABLED(ifq)) \ 399 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 400 else if (ALTQ_IS_ENABLED(ifq)) \ 401 ALTQ_POLL(ifq, m); \ 402 else \ 403 _IF_POLL(ifq, m); \ 404} while (0) 405 406#define IFQ_POLL(ifq, m) \ 407do { \ 408 IF_LOCK(ifq); \ 409 IFQ_POLL_NOLOCK(ifq, m); \ 410 IF_UNLOCK(ifq); \ 411} while (0) 412 413#define IFQ_PURGE_NOLOCK(ifq) \ 414do { \ 415 if (ALTQ_IS_ENABLED(ifq)) { \ 416 ALTQ_PURGE(ifq); \ 417 } else \ 418 _IF_DRAIN(ifq); \ 419} while (0) 420 421#define IFQ_PURGE(ifq) \ 422do { \ 423 IF_LOCK(ifq); \ 424 IFQ_PURGE_NOLOCK(ifq); \ 425 IF_UNLOCK(ifq); \ 426} while (0) 427 428#define IFQ_SET_READY(ifq) \ 429 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 430 431#else /* !ALTQ */ 432#define IFQ_ENQUEUE(ifq, m, err) \ 433do { \ 434 IF_LOCK(ifq); \ 435 if (_IF_QFULL(ifq)) { \ 436 m_freem(m); \ 437 (err) = ENOBUFS; \ 438 } else { \ 439 _IF_ENQUEUE(ifq, m); \ 440 (err) = 0; \ 441 } \ 442 if (err) \ 443 (ifq)->ifq_drops++; \ 444 IF_UNLOCK(ifq); \ 445} while (0) 446 447#define IFQ_DEQUEUE_NOLOCK(ifq, m) _IF_DEQUEUE(ifq, m) 448#define IFQ_DEQUEUE(ifq, m) IF_DEQUEUE(ifq, m) 449#define IFQ_POLL_NOLOCK(ifq, m) _IF_POLL(ifq, m) 450#define IFQ_POLL(ifq, m) IF_POLL(ifq, m) 451#define IFQ_PURGE_NOLOCK(ifq) _IF_DRAIN(ifq) 452#define IFQ_PURGE(ifq) IF_DRAIN(ifq) 453 454#define IFQ_SET_READY(ifq) /* nothing */ 455 456#endif /* !ALTQ */ 457 458#define IFQ_LOCK(ifq) IF_LOCK(ifq) 459#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq) 460#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq) 461#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0) 462#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++) 463#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len) 464#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++) 465#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len)) 466 467#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \ 468do { \ 469 int len; \ 470 short mflags; \ 471 \ 472 len = (m)->m_pkthdr.len; \ 473 mflags = (m)->m_flags; \ 474 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \ 475 if ((err) == 0) { \ 476 (ifp)->if_obytes += len + (adj); \ 477 if (mflags & M_MCAST) \ 478 (ifp)->if_omcasts++; \ 479 if (((ifp)->if_flags & IFF_OACTIVE) == 0) \ 480 (*(ifp)->if_start)(ifp); \ 481 } \ 482} while (0) 483 484#define IFQ_HANDOFF(ifp, m, err) \ 485 IFQ_HANDOFF_ADJ(ifp, m, 0, err) 486 487#define IFQ_DRV_DEQUEUE(ifq, m) \ 488do { \ 489 (m) = (ifq)->ifq_drv_head; \ 490 if (m) { \ 491 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \ 492 (ifq)->ifq_drv_tail = NULL; \ 493 (m)->m_nextpkt = NULL; \ 494 (ifq)->ifq_drv_len--; \ 495 } else { \ 496 IFQ_LOCK(ifq); \ 497 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 498 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \ 499 struct mbuf *m0; \ 500 IFQ_DEQUEUE_NOLOCK(ifq, m0); \ 501 if (m0 == NULL) \ 502 break; \ 503 m0->m_nextpkt = NULL; \ 504 if ((ifq)->ifq_drv_tail == NULL) \ 505 (ifq)->ifq_drv_head = m0; \ 506 else \ 507 (ifq)->ifq_drv_tail->m_nextpkt = m0; \ 508 (ifq)->ifq_drv_tail = m0; \ 509 (ifq)->ifq_drv_len++; \ 510 } \ 511 IFQ_UNLOCK(ifq); \ 512 } \ 513} while (0) 514 515#define IFQ_DRV_PREPEND(ifq, m) \ 516do { \ 517 (m)->m_nextpkt = (ifq)->ifq_drv_head; \ 518 if ((ifq)->ifq_tail == NULL) \ 519 (ifq)->ifq_tail = (m); \ 520 (ifq)->ifq_drv_head = (m); \ 521 (ifq)->ifq_drv_len++; \ 522} while (0) 523 524#define IFQ_DRV_IS_EMPTY(ifq) \ 525 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0)) 526 527#define IFQ_DRV_PURGE(ifq) \ 528do { \ 529 struct mbuf *m = (ifq)->ifq_drv_head; \ 530 while(m != NULL) { \ 531 m = m->m_nextpkt; \ 532 m_freem(m); \ 533 } \ 534 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \ 535 (ifq)->ifq_drv_len = 0; \ 536 IFQ_PURGE(ifq); \ 537} while (0) 538 539/* 540 * 72 was chosen below because it is the size of a TCP/IP 541 * header (40) + the minimum mss (32). 542 */ 543#define IF_MINMTU 72 544#define IF_MAXMTU 65535 545 546#endif /* _KERNEL */ 547 548/* 549 * The ifaddr structure contains information about one address 550 * of an interface. They are maintained by the different address families, 551 * are allocated and attached when an address is set, and are linked 552 * together so all addresses for an interface can be located. 553 * 554 * NOTE: a 'struct ifaddr' is always at the beginning of a larger 555 * chunk of malloc'ed memory, where we store the three addresses 556 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here. 557 */ 558struct ifaddr { 559 struct sockaddr *ifa_addr; /* address of interface */ 560 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 561#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 562 struct sockaddr *ifa_netmask; /* used to determine subnet */ 563 struct if_data if_data; /* not all members are meaningful */ 564 struct ifnet *ifa_ifp; /* back-pointer to interface */ 565 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 566 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 567 (int, struct rtentry *, struct rt_addrinfo *); 568 u_short ifa_flags; /* mostly rt_flags for cloning */ 569 u_int ifa_refcnt; /* references to this structure */ 570 int ifa_metric; /* cost of going out this interface */ 571 int (*ifa_claim_addr) /* check if an addr goes to this if */ 572 (struct ifaddr *, struct sockaddr *); 573 struct mtx ifa_mtx; 574}; 575#define IFA_ROUTE RTF_UP /* route installed */ 576 577/* for compatibility with other BSDs */ 578#define ifa_list ifa_link 579 580#define IFA_LOCK_INIT(ifa) \ 581 mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF) 582#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx) 583#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx) 584#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx) 585 586/* 587 * The prefix structure contains information about one prefix 588 * of an interface. They are maintained by the different address families, 589 * are allocated and attached when a prefix or an address is set, 590 * and are linked together so all prefixes for an interface can be located. 591 */ 592struct ifprefix { 593 struct sockaddr *ifpr_prefix; /* prefix of interface */ 594 struct ifnet *ifpr_ifp; /* back-pointer to interface */ 595 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */ 596 u_char ifpr_plen; /* prefix length in bits */ 597 u_char ifpr_type; /* protocol dependent prefix type */ 598}; 599 600/* 601 * Multicast address structure. This is analogous to the ifaddr 602 * structure except that it keeps track of multicast addresses. 603 * Also, the reference count here is a count of requests for this 604 * address, not a count of pointers to this structure. 605 */ 606struct ifmultiaddr { 607 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 608 struct sockaddr *ifma_addr; /* address this membership is for */ 609 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 610 struct ifnet *ifma_ifp; /* back-pointer to interface */ 611 u_int ifma_refcount; /* reference count */ 612 void *ifma_protospec; /* protocol-specific state, if any */ 613}; 614 615#ifdef _KERNEL 616#define IFAFREE(ifa) \ 617 do { \ 618 IFA_LOCK(ifa); \ 619 KASSERT((ifa)->ifa_refcnt > 0, \ 620 ("ifa %p !(ifa_refcnt > 0)", ifa)); \ 621 if (--(ifa)->ifa_refcnt == 0) { \ 622 IFA_DESTROY(ifa); \ 623 free(ifa, M_IFADDR); \ 624 } else \ 625 IFA_UNLOCK(ifa); \ 626 } while (0) 627 628#define IFAREF(ifa) \ 629 do { \ 630 IFA_LOCK(ifa); \ 631 ++(ifa)->ifa_refcnt; \ 632 IFA_UNLOCK(ifa); \ 633 } while (0) 634 635extern struct mtx ifnet_lock; 636#define IFNET_LOCK_INIT() \ 637 mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE) 638#define IFNET_WLOCK() mtx_lock(&ifnet_lock) 639#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock) 640#define IFNET_RLOCK() IFNET_WLOCK() 641#define IFNET_RUNLOCK() IFNET_WUNLOCK() 642 643struct ifindex_entry { 644 struct ifnet *ife_ifnet; 645 struct ifaddr *ife_ifnet_addr; 646 struct cdev *ife_dev; 647}; 648 649#define ifnet_byindex(idx) ifindex_table[(idx)].ife_ifnet 650/* 651 * Given the index, ifaddr_byindex() returns the one and only 652 * link-level ifaddr for the interface. You are not supposed to use 653 * it to traverse the list of addresses associated to the interface. 654 */ 655#define ifaddr_byindex(idx) ifindex_table[(idx)].ife_ifnet_addr 656#define ifdev_byindex(idx) ifindex_table[(idx)].ife_dev 657 658extern struct ifnethead ifnet; 659extern struct ifindex_entry *ifindex_table; 660extern int ifqmaxlen; 661extern struct ifnet *loif; /* first loopback interface */ 662extern int if_index; 663 664int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 665int if_allmulti(struct ifnet *, int); 666void if_attach(struct ifnet *); 667int if_delmulti(struct ifnet *, struct sockaddr *); 668void if_detach(struct ifnet *); 669void if_down(struct ifnet *); 670void if_initname(struct ifnet *, const char *, int); 671int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 672int if_setlladdr(struct ifnet *, const u_char *, int); 673void if_up(struct ifnet *); 674/*void ifinit(void);*/ /* declared in systm.h for main() */ 675int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 676int ifpromisc(struct ifnet *, int); 677struct ifnet *ifunit(const char *); 678 679struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 680struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 681struct ifaddr *ifa_ifwithnet(struct sockaddr *); 682struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 683struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 684 685struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *); 686int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 687 688void if_clone_attach(struct if_clone *); 689void if_clone_detach(struct if_clone *); 690 691int if_clone_create(char *, int); 692int if_clone_destroy(const char *); 693 694#define IF_LLADDR(ifp) \ 695 LLADDR((struct sockaddr_dl *) ifaddr_byindex((ifp)->if_index)->ifa_addr) 696 697#ifdef DEVICE_POLLING 698enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER }; 699 700typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 701int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 702int ether_poll_deregister(struct ifnet *ifp); 703#endif /* DEVICE_POLLING */ 704 705#endif /* _KERNEL */ 706 707#endif /* !_NET_IF_VAR_H_ */ 708