if_var.h revision 181892
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 181892 2008-08-20 03:14:48Z kmacy $ 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_llsoftc; /* link layer softc */ 165 int if_drv_flags; /* driver-managed status flags */ 166 u_int if_spare_flags2; /* spare flags 2 */ 167 struct ifaltq if_snd; /* output queue (includes altq) */ 168 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */ 169 170 void *if_bridge; /* bridge glue */ 171 172 struct lltable *lltables; /* list of L3-L2 resolution tables */ 173 174 struct label *if_label; /* interface MAC label */ 175 176 /* these are only used by IPv6 */ 177 struct ifprefixhead if_prefixhead; /* list of prefixes per if */ 178 void *if_afdata[AF_MAX]; 179 int if_afdata_initialized; 180 struct mtx if_afdata_mtx; 181 struct task if_starttask; /* task for IFF_NEEDSGIANT */ 182 struct task if_linktask; /* task for link change events */ 183 struct mtx if_addr_mtx; /* mutex to protect address lists */ 184 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */ 185 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */ 186 /* protected by if_addr_mtx */ 187 void *if_pf_kif; 188 void *if_lagg; /* lagg glue */ 189 void *if_pspare[10]; /* multiq/TOE 3; vimage 3; general use 4 */ 190 int if_ispare[2]; /* general use 2 */ 191}; 192 193typedef void if_init_f_t(void *); 194 195/* 196 * XXX These aliases are terribly dangerous because they could apply 197 * to anything. 198 */ 199#define if_mtu if_data.ifi_mtu 200#define if_type if_data.ifi_type 201#define if_physical if_data.ifi_physical 202#define if_addrlen if_data.ifi_addrlen 203#define if_hdrlen if_data.ifi_hdrlen 204#define if_metric if_data.ifi_metric 205#define if_link_state if_data.ifi_link_state 206#define if_baudrate if_data.ifi_baudrate 207#define if_hwassist if_data.ifi_hwassist 208#define if_ipackets if_data.ifi_ipackets 209#define if_ierrors if_data.ifi_ierrors 210#define if_opackets if_data.ifi_opackets 211#define if_oerrors if_data.ifi_oerrors 212#define if_collisions if_data.ifi_collisions 213#define if_ibytes if_data.ifi_ibytes 214#define if_obytes if_data.ifi_obytes 215#define if_imcasts if_data.ifi_imcasts 216#define if_omcasts if_data.ifi_omcasts 217#define if_iqdrops if_data.ifi_iqdrops 218#define if_noproto if_data.ifi_noproto 219#define if_lastchange if_data.ifi_lastchange 220#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)NULL) 221 222/* for compatibility with other BSDs */ 223#define if_addrlist if_addrhead 224#define if_list if_link 225#define if_name(ifp) ((ifp)->if_xname) 226 227/* 228 * Locks for address lists on the network interface. 229 */ 230#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \ 231 "if_addr_mtx", NULL, MTX_DEF) 232#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx) 233#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx) 234#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx) 235#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED) 236 237/* 238 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 239 * are queues of messages stored on ifqueue structures 240 * (defined above). Entries are added to and deleted from these structures 241 * by these macros, which should be called with ipl raised to splimp(). 242 */ 243#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 244#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 245#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 246#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 247#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 248#define _IF_QLEN(ifq) ((ifq)->ifq_len) 249 250#define _IF_ENQUEUE(ifq, m) do { \ 251 (m)->m_nextpkt = NULL; \ 252 if ((ifq)->ifq_tail == NULL) \ 253 (ifq)->ifq_head = m; \ 254 else \ 255 (ifq)->ifq_tail->m_nextpkt = m; \ 256 (ifq)->ifq_tail = m; \ 257 (ifq)->ifq_len++; \ 258} while (0) 259 260#define IF_ENQUEUE(ifq, m) do { \ 261 IF_LOCK(ifq); \ 262 _IF_ENQUEUE(ifq, m); \ 263 IF_UNLOCK(ifq); \ 264} while (0) 265 266#define _IF_PREPEND(ifq, m) do { \ 267 (m)->m_nextpkt = (ifq)->ifq_head; \ 268 if ((ifq)->ifq_tail == NULL) \ 269 (ifq)->ifq_tail = (m); \ 270 (ifq)->ifq_head = (m); \ 271 (ifq)->ifq_len++; \ 272} while (0) 273 274#define IF_PREPEND(ifq, m) do { \ 275 IF_LOCK(ifq); \ 276 _IF_PREPEND(ifq, m); \ 277 IF_UNLOCK(ifq); \ 278} while (0) 279 280#define _IF_DEQUEUE(ifq, m) do { \ 281 (m) = (ifq)->ifq_head; \ 282 if (m) { \ 283 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \ 284 (ifq)->ifq_tail = NULL; \ 285 (m)->m_nextpkt = NULL; \ 286 (ifq)->ifq_len--; \ 287 } \ 288} while (0) 289 290#define IF_DEQUEUE(ifq, m) do { \ 291 IF_LOCK(ifq); \ 292 _IF_DEQUEUE(ifq, m); \ 293 IF_UNLOCK(ifq); \ 294} while (0) 295 296#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 297#define IF_POLL(ifq, m) _IF_POLL(ifq, m) 298 299#define _IF_DRAIN(ifq) do { \ 300 struct mbuf *m; \ 301 for (;;) { \ 302 _IF_DEQUEUE(ifq, m); \ 303 if (m == NULL) \ 304 break; \ 305 m_freem(m); \ 306 } \ 307} while (0) 308 309#define IF_DRAIN(ifq) do { \ 310 IF_LOCK(ifq); \ 311 _IF_DRAIN(ifq); \ 312 IF_UNLOCK(ifq); \ 313} while(0) 314 315#ifdef _KERNEL 316/* interface address change event */ 317typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 318EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 319/* new interface arrival event */ 320typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 321EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 322/* interface departure event */ 323typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 324EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 325 326/* 327 * interface groups 328 */ 329struct ifg_group { 330 char ifg_group[IFNAMSIZ]; 331 u_int ifg_refcnt; 332 void *ifg_pf_kif; 333 TAILQ_HEAD(, ifg_member) ifg_members; 334 TAILQ_ENTRY(ifg_group) ifg_next; 335}; 336 337struct ifg_member { 338 TAILQ_ENTRY(ifg_member) ifgm_next; 339 struct ifnet *ifgm_ifp; 340}; 341 342struct ifg_list { 343 struct ifg_group *ifgl_group; 344 TAILQ_ENTRY(ifg_list) ifgl_next; 345}; 346 347/* group attach event */ 348typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *); 349EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t); 350/* group detach event */ 351typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *); 352EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t); 353/* group change event */ 354typedef void (*group_change_event_handler_t)(void *, const char *); 355EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t); 356 357#define IF_AFDATA_LOCK_INIT(ifp) \ 358 mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF) 359#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx) 360#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx) 361#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx) 362#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx) 363 364#define IFF_LOCKGIANT(ifp) do { \ 365 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 366 mtx_lock(&Giant); \ 367} while (0) 368 369#define IFF_UNLOCKGIANT(ifp) do { \ 370 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 371 mtx_unlock(&Giant); \ 372} while (0) 373 374int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, 375 int adjust); 376#define IF_HANDOFF(ifq, m, ifp) \ 377 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 378#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 379 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 380 381void if_start(struct ifnet *); 382 383#define IFQ_ENQUEUE(ifq, m, err) \ 384do { \ 385 IF_LOCK(ifq); \ 386 if (ALTQ_IS_ENABLED(ifq)) \ 387 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 388 else { \ 389 if (_IF_QFULL(ifq)) { \ 390 m_freem(m); \ 391 (err) = ENOBUFS; \ 392 } else { \ 393 _IF_ENQUEUE(ifq, m); \ 394 (err) = 0; \ 395 } \ 396 } \ 397 if (err) \ 398 (ifq)->ifq_drops++; \ 399 IF_UNLOCK(ifq); \ 400} while (0) 401 402#define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 403do { \ 404 if (TBR_IS_ENABLED(ifq)) \ 405 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 406 else if (ALTQ_IS_ENABLED(ifq)) \ 407 ALTQ_DEQUEUE(ifq, m); \ 408 else \ 409 _IF_DEQUEUE(ifq, m); \ 410} while (0) 411 412#define IFQ_DEQUEUE(ifq, m) \ 413do { \ 414 IF_LOCK(ifq); \ 415 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 416 IF_UNLOCK(ifq); \ 417} while (0) 418 419#define IFQ_POLL_NOLOCK(ifq, m) \ 420do { \ 421 if (TBR_IS_ENABLED(ifq)) \ 422 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 423 else if (ALTQ_IS_ENABLED(ifq)) \ 424 ALTQ_POLL(ifq, m); \ 425 else \ 426 _IF_POLL(ifq, m); \ 427} while (0) 428 429#define IFQ_POLL(ifq, m) \ 430do { \ 431 IF_LOCK(ifq); \ 432 IFQ_POLL_NOLOCK(ifq, m); \ 433 IF_UNLOCK(ifq); \ 434} while (0) 435 436#define IFQ_PURGE_NOLOCK(ifq) \ 437do { \ 438 if (ALTQ_IS_ENABLED(ifq)) { \ 439 ALTQ_PURGE(ifq); \ 440 } else \ 441 _IF_DRAIN(ifq); \ 442} while (0) 443 444#define IFQ_PURGE(ifq) \ 445do { \ 446 IF_LOCK(ifq); \ 447 IFQ_PURGE_NOLOCK(ifq); \ 448 IF_UNLOCK(ifq); \ 449} while (0) 450 451#define IFQ_SET_READY(ifq) \ 452 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 453 454#define IFQ_LOCK(ifq) IF_LOCK(ifq) 455#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq) 456#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq) 457#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0) 458#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++) 459#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len) 460#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++) 461#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len)) 462 463/* 464 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in 465 * the handoff logic, as that flag is locked by the device driver. 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_drv_flags & IFF_DRV_OACTIVE) == 0) \ 480 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_drv_tail == NULL) \ 519 (ifq)->ifq_drv_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, *n = (ifq)->ifq_drv_head; \ 530 while((m = n) != NULL) { \ 531 n = 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 */ 604struct ifmultiaddr { 605 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 606 struct sockaddr *ifma_addr; /* address this membership is for */ 607 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 608 struct ifnet *ifma_ifp; /* back-pointer to interface */ 609 u_int ifma_refcount; /* reference count */ 610 void *ifma_protospec; /* protocol-specific state, if any */ 611 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */ 612}; 613 614#ifdef _KERNEL 615#define IFAFREE(ifa) \ 616 do { \ 617 IFA_LOCK(ifa); \ 618 KASSERT((ifa)->ifa_refcnt > 0, \ 619 ("ifa %p !(ifa_refcnt > 0)", ifa)); \ 620 if (--(ifa)->ifa_refcnt == 0) { \ 621 IFA_DESTROY(ifa); \ 622 free(ifa, M_IFADDR); \ 623 } else \ 624 IFA_UNLOCK(ifa); \ 625 } while (0) 626 627#define IFAREF(ifa) \ 628 do { \ 629 IFA_LOCK(ifa); \ 630 ++(ifa)->ifa_refcnt; \ 631 IFA_UNLOCK(ifa); \ 632 } while (0) 633 634extern struct mtx ifnet_lock; 635#define IFNET_LOCK_INIT() \ 636 mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE) 637#define IFNET_WLOCK() mtx_lock(&ifnet_lock) 638#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock) 639#define IFNET_WLOCK_ASSERT() mtx_assert(&ifnet_lock, MA_OWNED) 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 648struct ifnet *ifnet_byindex(u_short idx); 649void ifnet_setbyindex(u_short idx, struct ifnet *ifp); 650 651/* 652 * Given the index, ifaddr_byindex() returns the one and only 653 * link-level ifaddr for the interface. You are not supposed to use 654 * it to traverse the list of addresses associated to the interface. 655 */ 656struct ifaddr *ifaddr_byindex(u_short idx); 657struct cdev *ifdev_byindex(u_short idx); 658 659extern struct ifnethead ifnet; 660extern int ifqmaxlen; 661extern struct ifnet *loif; /* first loopback interface */ 662extern int if_index; 663 664int if_addgroup(struct ifnet *, const char *); 665int if_delgroup(struct ifnet *, const char *); 666int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 667int if_allmulti(struct ifnet *, int); 668struct ifnet* if_alloc(u_char); 669void if_attach(struct ifnet *); 670int if_delmulti(struct ifnet *, struct sockaddr *); 671void if_delmulti_ifma(struct ifmultiaddr *); 672void if_detach(struct ifnet *); 673void if_purgeaddrs(struct ifnet *); 674void if_purgemaddrs(struct ifnet *); 675void if_down(struct ifnet *); 676struct ifmultiaddr * 677 if_findmulti(struct ifnet *, struct sockaddr *); 678void if_free(struct ifnet *); 679void if_free_type(struct ifnet *, u_char); 680void if_initname(struct ifnet *, const char *, int); 681void if_link_state_change(struct ifnet *, int); 682int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 683int if_setlladdr(struct ifnet *, const u_char *, int); 684void if_up(struct ifnet *); 685/*void ifinit(void);*/ /* declared in systm.h for main() */ 686int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 687int ifpromisc(struct ifnet *, int); 688struct ifnet *ifunit(const char *); 689 690struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 691struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *); 692struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 693struct ifaddr *ifa_ifwithnet(struct sockaddr *); 694struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 695struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int); 696 697struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 698 699int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 700 701typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp); 702typedef void if_com_free_t(void *com, u_char type); 703void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f); 704void if_deregister_com_alloc(u_char type); 705 706#define IF_LLADDR(ifp) \ 707 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr)) 708 709#ifdef DEVICE_POLLING 710enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS }; 711 712typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 713int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 714int ether_poll_deregister(struct ifnet *ifp); 715#endif /* DEVICE_POLLING */ 716 717#endif /* _KERNEL */ 718 719#endif /* !_NET_IF_VAR_H_ */ 720