if_var.h revision 168561
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 168561 2007-04-10 00:27:25Z thompsa $ 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; 71struct carp_if; 72struct ifvlantrunk; 73#endif 74 75#include <sys/queue.h> /* get TAILQ macros */ 76 77#ifdef _KERNEL 78#include <sys/mbuf.h> 79#include <sys/eventhandler.h> 80#endif /* _KERNEL */ 81#include <sys/lock.h> /* XXX */ 82#include <sys/mutex.h> /* XXX */ 83#include <sys/event.h> /* XXX */ 84#include <sys/_task.h> 85 86#define IF_DUNIT_NONE -1 87 88#include <altq/if_altq.h> 89 90TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 91TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */ 92TAILQ_HEAD(ifprefixhead, ifprefix); 93TAILQ_HEAD(ifmultihead, ifmultiaddr); 94TAILQ_HEAD(ifgrouphead, ifg_group); 95 96/* 97 * Structure defining a queue for a network interface. 98 */ 99struct ifqueue { 100 struct mbuf *ifq_head; 101 struct mbuf *ifq_tail; 102 int ifq_len; 103 int ifq_maxlen; 104 int ifq_drops; 105 struct mtx ifq_mtx; 106}; 107 108/* 109 * Structure defining a network interface. 110 * 111 * (Would like to call this struct ``if'', but C isn't PL/1.) 112 */ 113 114struct ifnet { 115 void *if_softc; /* pointer to driver state */ 116 void *if_l2com; /* pointer to protocol bits */ 117 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 118 char if_xname[IFNAMSIZ]; /* external name (name + unit) */ 119 const char *if_dname; /* driver name */ 120 int if_dunit; /* unit or IF_DUNIT_NONE */ 121 struct ifaddrhead if_addrhead; /* linked list of addresses per if */ 122 /* 123 * if_addrhead is the list of all addresses associated to 124 * an interface. 125 * Some code in the kernel assumes that first element 126 * of the list has type AF_LINK, and contains sockaddr_dl 127 * addresses which store the link-level address and the name 128 * of the interface. 129 * However, access to the AF_LINK address through this 130 * field is deprecated. Use if_addr or ifaddr_byindex() instead. 131 */ 132 struct knlist if_klist; /* events attached to this if */ 133 int if_pcount; /* number of promiscuous listeners */ 134 struct carp_if *if_carp; /* carp interface structure */ 135 struct bpf_if *if_bpf; /* packet filter structure */ 136 u_short if_index; /* numeric abbreviation for this if */ 137 short if_timer; /* time 'til if_watchdog called */ 138 struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */ 139 int if_flags; /* up/down, broadcast, etc. */ 140 int if_capabilities; /* interface features & capabilities */ 141 int if_capenable; /* enabled features & capabilities */ 142 void *if_linkmib; /* link-type-specific MIB data */ 143 size_t if_linkmiblen; /* length of above data */ 144 struct if_data if_data; 145 struct ifmultihead if_multiaddrs; /* multicast addresses configured */ 146 int if_amcount; /* number of all-multicast requests */ 147/* procedure handles */ 148 int (*if_output) /* output routine (enqueue) */ 149 (struct ifnet *, struct mbuf *, struct sockaddr *, 150 struct rtentry *); 151 void (*if_input) /* input routine (from h/w driver) */ 152 (struct ifnet *, struct mbuf *); 153 void (*if_start) /* initiate output routine */ 154 (struct ifnet *); 155 int (*if_ioctl) /* ioctl routine */ 156 (struct ifnet *, u_long, caddr_t); 157 void (*if_watchdog) /* timer routine */ 158 (struct ifnet *); 159 void (*if_init) /* Init routine */ 160 (void *); 161 int (*if_resolvemulti) /* validate/resolve multicast */ 162 (struct ifnet *, struct sockaddr **, struct sockaddr *); 163 struct ifaddr *if_addr; /* pointer to link-level address */ 164 void *if_spare2; /* spare pointer 2 */ 165 void *if_spare3; /* spare pointer 3 */ 166 int if_drv_flags; /* driver-managed status flags */ 167 u_int if_spare_flags2; /* spare flags 2 */ 168 struct ifaltq if_snd; /* output queue (includes altq) */ 169 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */ 170 171 void *if_bridge; /* bridge glue */ 172 173 struct lltable *lltables; /* list of L3-L2 resolution tables */ 174 175 struct label *if_label; /* interface MAC label */ 176 177 /* these are only used by IPv6 */ 178 struct ifprefixhead if_prefixhead; /* list of prefixes per if */ 179 void *if_afdata[AF_MAX]; 180 int if_afdata_initialized; 181 struct mtx if_afdata_mtx; 182 struct task if_starttask; /* task for IFF_NEEDSGIANT */ 183 struct task if_linktask; /* task for link change events */ 184 struct mtx if_addr_mtx; /* mutex to protect address lists */ 185 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */ 186 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */ 187 /* protected by if_addr_mtx */ 188 void *if_pf_kif; 189 void *if_trunk; /* trunk glue */ 190}; 191 192typedef void if_init_f_t(void *); 193 194/* 195 * XXX These aliases are terribly dangerous because they could apply 196 * to anything. 197 */ 198#define if_mtu if_data.ifi_mtu 199#define if_type if_data.ifi_type 200#define if_physical if_data.ifi_physical 201#define if_addrlen if_data.ifi_addrlen 202#define if_hdrlen if_data.ifi_hdrlen 203#define if_metric if_data.ifi_metric 204#define if_link_state if_data.ifi_link_state 205#define if_baudrate if_data.ifi_baudrate 206#define if_hwassist if_data.ifi_hwassist 207#define if_ipackets if_data.ifi_ipackets 208#define if_ierrors if_data.ifi_ierrors 209#define if_opackets if_data.ifi_opackets 210#define if_oerrors if_data.ifi_oerrors 211#define if_collisions if_data.ifi_collisions 212#define if_ibytes if_data.ifi_ibytes 213#define if_obytes if_data.ifi_obytes 214#define if_imcasts if_data.ifi_imcasts 215#define if_omcasts if_data.ifi_omcasts 216#define if_iqdrops if_data.ifi_iqdrops 217#define if_noproto if_data.ifi_noproto 218#define if_lastchange if_data.ifi_lastchange 219#define if_recvquota if_data.ifi_recvquota 220#define if_xmitquota if_data.ifi_xmitquota 221#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)NULL) 222 223/* for compatibility with other BSDs */ 224#define if_addrlist if_addrhead 225#define if_list if_link 226#define if_name(ifp) ((ifp)->if_xname) 227 228/* 229 * Locks for address lists on the network interface. 230 */ 231#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \ 232 "if_addr_mtx", NULL, MTX_DEF) 233#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx) 234#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx) 235#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx) 236#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED) 237 238/* 239 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 240 * are queues of messages stored on ifqueue structures 241 * (defined above). Entries are added to and deleted from these structures 242 * by these macros, which should be called with ipl raised to splimp(). 243 */ 244#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 245#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 246#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 247#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 248#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 249#define _IF_QLEN(ifq) ((ifq)->ifq_len) 250 251#define _IF_ENQUEUE(ifq, m) do { \ 252 (m)->m_nextpkt = NULL; \ 253 if ((ifq)->ifq_tail == NULL) \ 254 (ifq)->ifq_head = m; \ 255 else \ 256 (ifq)->ifq_tail->m_nextpkt = m; \ 257 (ifq)->ifq_tail = m; \ 258 (ifq)->ifq_len++; \ 259} while (0) 260 261#define IF_ENQUEUE(ifq, m) do { \ 262 IF_LOCK(ifq); \ 263 _IF_ENQUEUE(ifq, m); \ 264 IF_UNLOCK(ifq); \ 265} while (0) 266 267#define _IF_PREPEND(ifq, m) do { \ 268 (m)->m_nextpkt = (ifq)->ifq_head; \ 269 if ((ifq)->ifq_tail == NULL) \ 270 (ifq)->ifq_tail = (m); \ 271 (ifq)->ifq_head = (m); \ 272 (ifq)->ifq_len++; \ 273} while (0) 274 275#define IF_PREPEND(ifq, m) do { \ 276 IF_LOCK(ifq); \ 277 _IF_PREPEND(ifq, m); \ 278 IF_UNLOCK(ifq); \ 279} while (0) 280 281#define _IF_DEQUEUE(ifq, m) do { \ 282 (m) = (ifq)->ifq_head; \ 283 if (m) { \ 284 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \ 285 (ifq)->ifq_tail = NULL; \ 286 (m)->m_nextpkt = NULL; \ 287 (ifq)->ifq_len--; \ 288 } \ 289} while (0) 290 291#define IF_DEQUEUE(ifq, m) do { \ 292 IF_LOCK(ifq); \ 293 _IF_DEQUEUE(ifq, m); \ 294 IF_UNLOCK(ifq); \ 295} while (0) 296 297#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 298#define IF_POLL(ifq, m) _IF_POLL(ifq, m) 299 300#define _IF_DRAIN(ifq) do { \ 301 struct mbuf *m; \ 302 for (;;) { \ 303 _IF_DEQUEUE(ifq, m); \ 304 if (m == NULL) \ 305 break; \ 306 m_freem(m); \ 307 } \ 308} while (0) 309 310#define IF_DRAIN(ifq) do { \ 311 IF_LOCK(ifq); \ 312 _IF_DRAIN(ifq); \ 313 IF_UNLOCK(ifq); \ 314} while(0) 315 316#ifdef _KERNEL 317/* interface address change event */ 318typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 319EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 320/* new interface arrival event */ 321typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 322EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 323/* interface departure event */ 324typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 325EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 326 327/* 328 * interface groups 329 */ 330struct ifg_group { 331 char ifg_group[IFNAMSIZ]; 332 u_int ifg_refcnt; 333 void *ifg_pf_kif; 334 TAILQ_HEAD(, ifg_member) ifg_members; 335 TAILQ_ENTRY(ifg_group) ifg_next; 336}; 337 338struct ifg_member { 339 TAILQ_ENTRY(ifg_member) ifgm_next; 340 struct ifnet *ifgm_ifp; 341}; 342 343struct ifg_list { 344 struct ifg_group *ifgl_group; 345 TAILQ_ENTRY(ifg_list) ifgl_next; 346}; 347 348/* group attach event */ 349typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *); 350EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t); 351/* group detach event */ 352typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *); 353EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t); 354/* group change event */ 355typedef void (*group_change_event_handler_t)(void *, const char *); 356EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t); 357 358#define IF_AFDATA_LOCK_INIT(ifp) \ 359 mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF) 360#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx) 361#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx) 362#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx) 363#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx) 364 365#define IFF_LOCKGIANT(ifp) do { \ 366 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 367 mtx_lock(&Giant); \ 368} while (0) 369 370#define IFF_UNLOCKGIANT(ifp) do { \ 371 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 372 mtx_unlock(&Giant); \ 373} while (0) 374 375int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, 376 int adjust); 377#define IF_HANDOFF(ifq, m, ifp) \ 378 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 379#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 380 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 381 382void if_start(struct ifnet *); 383 384#define IFQ_ENQUEUE(ifq, m, err) \ 385do { \ 386 IF_LOCK(ifq); \ 387 if (ALTQ_IS_ENABLED(ifq)) \ 388 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 389 else { \ 390 if (_IF_QFULL(ifq)) { \ 391 m_freem(m); \ 392 (err) = ENOBUFS; \ 393 } else { \ 394 _IF_ENQUEUE(ifq, m); \ 395 (err) = 0; \ 396 } \ 397 } \ 398 if (err) \ 399 (ifq)->ifq_drops++; \ 400 IF_UNLOCK(ifq); \ 401} while (0) 402 403#define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 404do { \ 405 if (TBR_IS_ENABLED(ifq)) \ 406 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 407 else if (ALTQ_IS_ENABLED(ifq)) \ 408 ALTQ_DEQUEUE(ifq, m); \ 409 else \ 410 _IF_DEQUEUE(ifq, m); \ 411} while (0) 412 413#define IFQ_DEQUEUE(ifq, m) \ 414do { \ 415 IF_LOCK(ifq); \ 416 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 417 IF_UNLOCK(ifq); \ 418} while (0) 419 420#define IFQ_POLL_NOLOCK(ifq, m) \ 421do { \ 422 if (TBR_IS_ENABLED(ifq)) \ 423 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 424 else if (ALTQ_IS_ENABLED(ifq)) \ 425 ALTQ_POLL(ifq, m); \ 426 else \ 427 _IF_POLL(ifq, m); \ 428} while (0) 429 430#define IFQ_POLL(ifq, m) \ 431do { \ 432 IF_LOCK(ifq); \ 433 IFQ_POLL_NOLOCK(ifq, m); \ 434 IF_UNLOCK(ifq); \ 435} while (0) 436 437#define IFQ_PURGE_NOLOCK(ifq) \ 438do { \ 439 if (ALTQ_IS_ENABLED(ifq)) { \ 440 ALTQ_PURGE(ifq); \ 441 } else \ 442 _IF_DRAIN(ifq); \ 443} while (0) 444 445#define IFQ_PURGE(ifq) \ 446do { \ 447 IF_LOCK(ifq); \ 448 IFQ_PURGE_NOLOCK(ifq); \ 449 IF_UNLOCK(ifq); \ 450} while (0) 451 452#define IFQ_SET_READY(ifq) \ 453 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 454 455#define IFQ_LOCK(ifq) IF_LOCK(ifq) 456#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq) 457#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq) 458#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0) 459#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++) 460#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len) 461#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++) 462#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len)) 463 464/* 465 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in 466 * the handoff logic, as that flag is locked by the device driver. 467 */ 468#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \ 469do { \ 470 int len; \ 471 short mflags; \ 472 \ 473 len = (m)->m_pkthdr.len; \ 474 mflags = (m)->m_flags; \ 475 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \ 476 if ((err) == 0) { \ 477 (ifp)->if_obytes += len + (adj); \ 478 if (mflags & M_MCAST) \ 479 (ifp)->if_omcasts++; \ 480 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \ 481 if_start(ifp); \ 482 } \ 483} while (0) 484 485#define IFQ_HANDOFF(ifp, m, err) \ 486 IFQ_HANDOFF_ADJ(ifp, m, 0, err) 487 488#define IFQ_DRV_DEQUEUE(ifq, m) \ 489do { \ 490 (m) = (ifq)->ifq_drv_head; \ 491 if (m) { \ 492 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \ 493 (ifq)->ifq_drv_tail = NULL; \ 494 (m)->m_nextpkt = NULL; \ 495 (ifq)->ifq_drv_len--; \ 496 } else { \ 497 IFQ_LOCK(ifq); \ 498 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 499 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \ 500 struct mbuf *m0; \ 501 IFQ_DEQUEUE_NOLOCK(ifq, m0); \ 502 if (m0 == NULL) \ 503 break; \ 504 m0->m_nextpkt = NULL; \ 505 if ((ifq)->ifq_drv_tail == NULL) \ 506 (ifq)->ifq_drv_head = m0; \ 507 else \ 508 (ifq)->ifq_drv_tail->m_nextpkt = m0; \ 509 (ifq)->ifq_drv_tail = m0; \ 510 (ifq)->ifq_drv_len++; \ 511 } \ 512 IFQ_UNLOCK(ifq); \ 513 } \ 514} while (0) 515 516#define IFQ_DRV_PREPEND(ifq, m) \ 517do { \ 518 (m)->m_nextpkt = (ifq)->ifq_drv_head; \ 519 if ((ifq)->ifq_drv_tail == NULL) \ 520 (ifq)->ifq_drv_tail = (m); \ 521 (ifq)->ifq_drv_head = (m); \ 522 (ifq)->ifq_drv_len++; \ 523} while (0) 524 525#define IFQ_DRV_IS_EMPTY(ifq) \ 526 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0)) 527 528#define IFQ_DRV_PURGE(ifq) \ 529do { \ 530 struct mbuf *m, *n = (ifq)->ifq_drv_head; \ 531 while((m = n) != NULL) { \ 532 n = m->m_nextpkt; \ 533 m_freem(m); \ 534 } \ 535 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \ 536 (ifq)->ifq_drv_len = 0; \ 537 IFQ_PURGE(ifq); \ 538} while (0) 539 540/* 541 * 72 was chosen below because it is the size of a TCP/IP 542 * header (40) + the minimum mss (32). 543 */ 544#define IF_MINMTU 72 545#define IF_MAXMTU 65535 546 547#endif /* _KERNEL */ 548 549/* 550 * The ifaddr structure contains information about one address 551 * of an interface. They are maintained by the different address families, 552 * are allocated and attached when an address is set, and are linked 553 * together so all addresses for an interface can be located. 554 * 555 * NOTE: a 'struct ifaddr' is always at the beginning of a larger 556 * chunk of malloc'ed memory, where we store the three addresses 557 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here. 558 */ 559struct ifaddr { 560 struct sockaddr *ifa_addr; /* address of interface */ 561 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 562#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 563 struct sockaddr *ifa_netmask; /* used to determine subnet */ 564 struct if_data if_data; /* not all members are meaningful */ 565 struct ifnet *ifa_ifp; /* back-pointer to interface */ 566 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 567 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 568 (int, struct rtentry *, struct rt_addrinfo *); 569 u_short ifa_flags; /* mostly rt_flags for cloning */ 570 u_int ifa_refcnt; /* references to this structure */ 571 int ifa_metric; /* cost of going out this interface */ 572 int (*ifa_claim_addr) /* check if an addr goes to this if */ 573 (struct ifaddr *, struct sockaddr *); 574 struct mtx ifa_mtx; 575}; 576#define IFA_ROUTE RTF_UP /* route installed */ 577 578/* for compatibility with other BSDs */ 579#define ifa_list ifa_link 580 581#define IFA_LOCK_INIT(ifa) \ 582 mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF) 583#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx) 584#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx) 585#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx) 586 587/* 588 * The prefix structure contains information about one prefix 589 * of an interface. They are maintained by the different address families, 590 * are allocated and attached when a prefix or an address is set, 591 * and are linked together so all prefixes for an interface can be located. 592 */ 593struct ifprefix { 594 struct sockaddr *ifpr_prefix; /* prefix of interface */ 595 struct ifnet *ifpr_ifp; /* back-pointer to interface */ 596 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */ 597 u_char ifpr_plen; /* prefix length in bits */ 598 u_char ifpr_type; /* protocol dependent prefix type */ 599}; 600 601/* 602 * Multicast address structure. This is analogous to the ifaddr 603 * structure except that it keeps track of multicast addresses. 604 */ 605struct ifmultiaddr { 606 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 607 struct sockaddr *ifma_addr; /* address this membership is for */ 608 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 609 struct ifnet *ifma_ifp; /* back-pointer to interface */ 610 u_int ifma_refcount; /* reference count */ 611 void *ifma_protospec; /* protocol-specific state, if any */ 612 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */ 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 cdev *ife_dev; 646}; 647 648#define ifnet_byindex(idx) ifindex_table[(idx)].ife_ifnet 649/* 650 * Given the index, ifaddr_byindex() returns the one and only 651 * link-level ifaddr for the interface. You are not supposed to use 652 * it to traverse the list of addresses associated to the interface. 653 */ 654#define ifaddr_byindex(idx) ifnet_byindex(idx)->if_addr 655#define ifdev_byindex(idx) ifindex_table[(idx)].ife_dev 656 657extern struct ifnethead ifnet; 658extern struct ifindex_entry *ifindex_table; 659extern int ifqmaxlen; 660extern struct ifnet *loif; /* first loopback interface */ 661extern int if_index; 662 663int if_addgroup(struct ifnet *, const char *); 664int if_delgroup(struct ifnet *, const char *); 665int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 666int if_allmulti(struct ifnet *, int); 667struct ifnet* if_alloc(u_char); 668void if_attach(struct ifnet *); 669int if_delmulti(struct ifnet *, struct sockaddr *); 670void if_delmulti_ifma(struct ifmultiaddr *); 671void if_detach(struct ifnet *); 672void if_purgeaddrs(struct ifnet *); 673void if_down(struct ifnet *); 674struct ifmultiaddr * 675 if_findmulti(struct ifnet *, struct sockaddr *); 676void if_free(struct ifnet *); 677void if_free_type(struct ifnet *, u_char); 678void if_initname(struct ifnet *, const char *, int); 679void if_link_state_change(struct ifnet *, int); 680int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 681int if_setlladdr(struct ifnet *, const u_char *, int); 682void if_up(struct ifnet *); 683/*void ifinit(void);*/ /* declared in systm.h for main() */ 684int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 685int ifpromisc(struct ifnet *, int); 686struct ifnet *ifunit(const char *); 687 688struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 689struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *); 690struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 691struct ifaddr *ifa_ifwithnet(struct sockaddr *); 692struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 693struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 694 695int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 696 697typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp); 698typedef void if_com_free_t(void *com, u_char type); 699void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f); 700void if_deregister_com_alloc(u_char type); 701 702#define IF_LLADDR(ifp) \ 703 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr)) 704 705#ifdef DEVICE_POLLING 706enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS }; 707 708typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 709int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 710int ether_poll_deregister(struct ifnet *ifp); 711#endif /* DEVICE_POLLING */ 712 713#endif /* _KERNEL */ 714 715#endif /* !_NET_IF_VAR_H_ */ 716