ifq.h revision 186048
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 186048 2008-12-13 19:13:03Z bz $ 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[8]; /* multiq/TOE 3; vimage 3; general use 4 */ 190 void (*if_qflush) /* flush any queues */ 191 (struct ifnet *); 192 int (*if_transmit) /* initiate output routine */ 193 (struct ifnet *, struct mbuf *); 194 int if_ispare[2]; /* general use 2 */ 195}; 196 197typedef void if_init_f_t(void *); 198 199/* 200 * XXX These aliases are terribly dangerous because they could apply 201 * to anything. 202 */ 203#define if_mtu if_data.ifi_mtu 204#define if_type if_data.ifi_type 205#define if_physical if_data.ifi_physical 206#define if_addrlen if_data.ifi_addrlen 207#define if_hdrlen if_data.ifi_hdrlen 208#define if_metric if_data.ifi_metric 209#define if_link_state if_data.ifi_link_state 210#define if_baudrate if_data.ifi_baudrate 211#define if_hwassist if_data.ifi_hwassist 212#define if_ipackets if_data.ifi_ipackets 213#define if_ierrors if_data.ifi_ierrors 214#define if_opackets if_data.ifi_opackets 215#define if_oerrors if_data.ifi_oerrors 216#define if_collisions if_data.ifi_collisions 217#define if_ibytes if_data.ifi_ibytes 218#define if_obytes if_data.ifi_obytes 219#define if_imcasts if_data.ifi_imcasts 220#define if_omcasts if_data.ifi_omcasts 221#define if_iqdrops if_data.ifi_iqdrops 222#define if_noproto if_data.ifi_noproto 223#define if_lastchange if_data.ifi_lastchange 224#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)NULL) 225 226/* for compatibility with other BSDs */ 227#define if_addrlist if_addrhead 228#define if_list if_link 229#define if_name(ifp) ((ifp)->if_xname) 230 231/* 232 * Locks for address lists on the network interface. 233 */ 234#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \ 235 "if_addr_mtx", NULL, MTX_DEF) 236#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx) 237#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx) 238#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx) 239#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED) 240 241/* 242 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 243 * are queues of messages stored on ifqueue structures 244 * (defined above). Entries are added to and deleted from these structures 245 * by these macros, which should be called with ipl raised to splimp(). 246 */ 247#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 248#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 249#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 250#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 251#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 252#define _IF_QLEN(ifq) ((ifq)->ifq_len) 253 254#define _IF_ENQUEUE(ifq, m) do { \ 255 (m)->m_nextpkt = NULL; \ 256 if ((ifq)->ifq_tail == NULL) \ 257 (ifq)->ifq_head = m; \ 258 else \ 259 (ifq)->ifq_tail->m_nextpkt = m; \ 260 (ifq)->ifq_tail = m; \ 261 (ifq)->ifq_len++; \ 262} while (0) 263 264#define IF_ENQUEUE(ifq, m) do { \ 265 IF_LOCK(ifq); \ 266 _IF_ENQUEUE(ifq, m); \ 267 IF_UNLOCK(ifq); \ 268} while (0) 269 270#define _IF_PREPEND(ifq, m) do { \ 271 (m)->m_nextpkt = (ifq)->ifq_head; \ 272 if ((ifq)->ifq_tail == NULL) \ 273 (ifq)->ifq_tail = (m); \ 274 (ifq)->ifq_head = (m); \ 275 (ifq)->ifq_len++; \ 276} while (0) 277 278#define IF_PREPEND(ifq, m) do { \ 279 IF_LOCK(ifq); \ 280 _IF_PREPEND(ifq, m); \ 281 IF_UNLOCK(ifq); \ 282} while (0) 283 284#define _IF_DEQUEUE(ifq, m) do { \ 285 (m) = (ifq)->ifq_head; \ 286 if (m) { \ 287 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \ 288 (ifq)->ifq_tail = NULL; \ 289 (m)->m_nextpkt = NULL; \ 290 (ifq)->ifq_len--; \ 291 } \ 292} while (0) 293 294#define IF_DEQUEUE(ifq, m) do { \ 295 IF_LOCK(ifq); \ 296 _IF_DEQUEUE(ifq, m); \ 297 IF_UNLOCK(ifq); \ 298} while (0) 299 300#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 301#define IF_POLL(ifq, m) _IF_POLL(ifq, m) 302 303#define _IF_DRAIN(ifq) do { \ 304 struct mbuf *m; \ 305 for (;;) { \ 306 _IF_DEQUEUE(ifq, m); \ 307 if (m == NULL) \ 308 break; \ 309 m_freem(m); \ 310 } \ 311} while (0) 312 313#define IF_DRAIN(ifq) do { \ 314 IF_LOCK(ifq); \ 315 _IF_DRAIN(ifq); \ 316 IF_UNLOCK(ifq); \ 317} while(0) 318 319#ifdef _KERNEL 320/* interface address change event */ 321typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 322EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 323/* new interface arrival event */ 324typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 325EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 326/* interface departure event */ 327typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 328EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 329 330/* 331 * interface groups 332 */ 333struct ifg_group { 334 char ifg_group[IFNAMSIZ]; 335 u_int ifg_refcnt; 336 void *ifg_pf_kif; 337 TAILQ_HEAD(, ifg_member) ifg_members; 338 TAILQ_ENTRY(ifg_group) ifg_next; 339}; 340 341struct ifg_member { 342 TAILQ_ENTRY(ifg_member) ifgm_next; 343 struct ifnet *ifgm_ifp; 344}; 345 346struct ifg_list { 347 struct ifg_group *ifgl_group; 348 TAILQ_ENTRY(ifg_list) ifgl_next; 349}; 350 351/* group attach event */ 352typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *); 353EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t); 354/* group detach event */ 355typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *); 356EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t); 357/* group change event */ 358typedef void (*group_change_event_handler_t)(void *, const char *); 359EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t); 360 361#define IF_AFDATA_LOCK_INIT(ifp) \ 362 mtx_init(&(ifp)->if_afdata_mtx, "if_afdata", NULL, MTX_DEF) 363#define IF_AFDATA_LOCK(ifp) mtx_lock(&(ifp)->if_afdata_mtx) 364#define IF_AFDATA_TRYLOCK(ifp) mtx_trylock(&(ifp)->if_afdata_mtx) 365#define IF_AFDATA_UNLOCK(ifp) mtx_unlock(&(ifp)->if_afdata_mtx) 366#define IF_AFDATA_DESTROY(ifp) mtx_destroy(&(ifp)->if_afdata_mtx) 367 368#define IFF_LOCKGIANT(ifp) do { \ 369 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 370 mtx_lock(&Giant); \ 371} while (0) 372 373#define IFF_UNLOCKGIANT(ifp) do { \ 374 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 375 mtx_unlock(&Giant); \ 376} while (0) 377 378int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, 379 int adjust); 380#define IF_HANDOFF(ifq, m, ifp) \ 381 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 382#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 383 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 384 385void if_start(struct ifnet *); 386 387#define IFQ_ENQUEUE(ifq, m, err) \ 388do { \ 389 IF_LOCK(ifq); \ 390 if (ALTQ_IS_ENABLED(ifq)) \ 391 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 392 else { \ 393 if (_IF_QFULL(ifq)) { \ 394 m_freem(m); \ 395 (err) = ENOBUFS; \ 396 } else { \ 397 _IF_ENQUEUE(ifq, m); \ 398 (err) = 0; \ 399 } \ 400 } \ 401 if (err) \ 402 (ifq)->ifq_drops++; \ 403 IF_UNLOCK(ifq); \ 404} while (0) 405 406#define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 407do { \ 408 if (TBR_IS_ENABLED(ifq)) \ 409 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 410 else if (ALTQ_IS_ENABLED(ifq)) \ 411 ALTQ_DEQUEUE(ifq, m); \ 412 else \ 413 _IF_DEQUEUE(ifq, m); \ 414} while (0) 415 416#define IFQ_DEQUEUE(ifq, m) \ 417do { \ 418 IF_LOCK(ifq); \ 419 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 420 IF_UNLOCK(ifq); \ 421} while (0) 422 423#define IFQ_POLL_NOLOCK(ifq, m) \ 424do { \ 425 if (TBR_IS_ENABLED(ifq)) \ 426 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 427 else if (ALTQ_IS_ENABLED(ifq)) \ 428 ALTQ_POLL(ifq, m); \ 429 else \ 430 _IF_POLL(ifq, m); \ 431} while (0) 432 433#define IFQ_POLL(ifq, m) \ 434do { \ 435 IF_LOCK(ifq); \ 436 IFQ_POLL_NOLOCK(ifq, m); \ 437 IF_UNLOCK(ifq); \ 438} while (0) 439 440#define IFQ_PURGE_NOLOCK(ifq) \ 441do { \ 442 if (ALTQ_IS_ENABLED(ifq)) { \ 443 ALTQ_PURGE(ifq); \ 444 } else \ 445 _IF_DRAIN(ifq); \ 446} while (0) 447 448#define IFQ_PURGE(ifq) \ 449do { \ 450 IF_LOCK(ifq); \ 451 IFQ_PURGE_NOLOCK(ifq); \ 452 IF_UNLOCK(ifq); \ 453} while (0) 454 455#define IFQ_SET_READY(ifq) \ 456 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 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/* 468 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in 469 * the handoff logic, as that flag is locked by the device driver. 470 */ 471#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \ 472do { \ 473 int len; \ 474 short mflags; \ 475 \ 476 len = (m)->m_pkthdr.len; \ 477 mflags = (m)->m_flags; \ 478 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \ 479 if ((err) == 0) { \ 480 (ifp)->if_obytes += len + (adj); \ 481 if (mflags & M_MCAST) \ 482 (ifp)->if_omcasts++; \ 483 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \ 484 if_start(ifp); \ 485 } \ 486} while (0) 487 488#define IFQ_HANDOFF(ifp, m, err) \ 489 IFQ_HANDOFF_ADJ(ifp, m, 0, err) 490 491#define IFQ_DRV_DEQUEUE(ifq, m) \ 492do { \ 493 (m) = (ifq)->ifq_drv_head; \ 494 if (m) { \ 495 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \ 496 (ifq)->ifq_drv_tail = NULL; \ 497 (m)->m_nextpkt = NULL; \ 498 (ifq)->ifq_drv_len--; \ 499 } else { \ 500 IFQ_LOCK(ifq); \ 501 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 502 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \ 503 struct mbuf *m0; \ 504 IFQ_DEQUEUE_NOLOCK(ifq, m0); \ 505 if (m0 == NULL) \ 506 break; \ 507 m0->m_nextpkt = NULL; \ 508 if ((ifq)->ifq_drv_tail == NULL) \ 509 (ifq)->ifq_drv_head = m0; \ 510 else \ 511 (ifq)->ifq_drv_tail->m_nextpkt = m0; \ 512 (ifq)->ifq_drv_tail = m0; \ 513 (ifq)->ifq_drv_len++; \ 514 } \ 515 IFQ_UNLOCK(ifq); \ 516 } \ 517} while (0) 518 519#define IFQ_DRV_PREPEND(ifq, m) \ 520do { \ 521 (m)->m_nextpkt = (ifq)->ifq_drv_head; \ 522 if ((ifq)->ifq_drv_tail == NULL) \ 523 (ifq)->ifq_drv_tail = (m); \ 524 (ifq)->ifq_drv_head = (m); \ 525 (ifq)->ifq_drv_len++; \ 526} while (0) 527 528#define IFQ_DRV_IS_EMPTY(ifq) \ 529 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0)) 530 531#define IFQ_DRV_PURGE(ifq) \ 532do { \ 533 struct mbuf *m, *n = (ifq)->ifq_drv_head; \ 534 while((m = n) != NULL) { \ 535 n = m->m_nextpkt; \ 536 m_freem(m); \ 537 } \ 538 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \ 539 (ifq)->ifq_drv_len = 0; \ 540 IFQ_PURGE(ifq); \ 541} while (0) 542 543/* 544 * 72 was chosen below because it is the size of a TCP/IP 545 * header (40) + the minimum mss (32). 546 */ 547#define IF_MINMTU 72 548#define IF_MAXMTU 65535 549 550#endif /* _KERNEL */ 551 552/* 553 * The ifaddr structure contains information about one address 554 * of an interface. They are maintained by the different address families, 555 * are allocated and attached when an address is set, and are linked 556 * together so all addresses for an interface can be located. 557 * 558 * NOTE: a 'struct ifaddr' is always at the beginning of a larger 559 * chunk of malloc'ed memory, where we store the three addresses 560 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here. 561 */ 562struct ifaddr { 563 struct sockaddr *ifa_addr; /* address of interface */ 564 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 565#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 566 struct sockaddr *ifa_netmask; /* used to determine subnet */ 567 struct if_data if_data; /* not all members are meaningful */ 568 struct ifnet *ifa_ifp; /* back-pointer to interface */ 569 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 570 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 571 (int, struct rtentry *, struct rt_addrinfo *); 572 u_short ifa_flags; /* mostly rt_flags for cloning */ 573 u_int ifa_refcnt; /* references to this structure */ 574 int ifa_metric; /* cost of going out this interface */ 575 int (*ifa_claim_addr) /* check if an addr goes to this if */ 576 (struct ifaddr *, struct sockaddr *); 577 struct mtx ifa_mtx; 578}; 579#define IFA_ROUTE RTF_UP /* route installed */ 580 581/* for compatibility with other BSDs */ 582#define ifa_list ifa_link 583 584#define IFA_LOCK_INIT(ifa) \ 585 mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF) 586#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx) 587#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx) 588#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx) 589 590/* 591 * The prefix structure contains information about one prefix 592 * of an interface. They are maintained by the different address families, 593 * are allocated and attached when a prefix or an address is set, 594 * and are linked together so all prefixes for an interface can be located. 595 */ 596struct ifprefix { 597 struct sockaddr *ifpr_prefix; /* prefix of interface */ 598 struct ifnet *ifpr_ifp; /* back-pointer to interface */ 599 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */ 600 u_char ifpr_plen; /* prefix length in bits */ 601 u_char ifpr_type; /* protocol dependent prefix type */ 602}; 603 604/* 605 * Multicast address structure. This is analogous to the ifaddr 606 * structure except that it keeps track of multicast addresses. 607 */ 608struct ifmultiaddr { 609 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 610 struct sockaddr *ifma_addr; /* address this membership is for */ 611 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 612 struct ifnet *ifma_ifp; /* back-pointer to interface */ 613 u_int ifma_refcount; /* reference count */ 614 void *ifma_protospec; /* protocol-specific state, if any */ 615 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */ 616}; 617 618#ifdef _KERNEL 619#define IFAFREE(ifa) \ 620 do { \ 621 IFA_LOCK(ifa); \ 622 KASSERT((ifa)->ifa_refcnt > 0, \ 623 ("ifa %p !(ifa_refcnt > 0)", ifa)); \ 624 if (--(ifa)->ifa_refcnt == 0) { \ 625 IFA_DESTROY(ifa); \ 626 free(ifa, M_IFADDR); \ 627 } else \ 628 IFA_UNLOCK(ifa); \ 629 } while (0) 630 631#define IFAREF(ifa) \ 632 do { \ 633 IFA_LOCK(ifa); \ 634 ++(ifa)->ifa_refcnt; \ 635 IFA_UNLOCK(ifa); \ 636 } while (0) 637 638extern struct mtx ifnet_lock; 639#define IFNET_LOCK_INIT() \ 640 mtx_init(&ifnet_lock, "ifnet", NULL, MTX_DEF | MTX_RECURSE) 641#define IFNET_WLOCK() mtx_lock(&ifnet_lock) 642#define IFNET_WUNLOCK() mtx_unlock(&ifnet_lock) 643#define IFNET_WLOCK_ASSERT() mtx_assert(&ifnet_lock, MA_OWNED) 644#define IFNET_RLOCK() IFNET_WLOCK() 645#define IFNET_RUNLOCK() IFNET_WUNLOCK() 646 647struct ifindex_entry { 648 struct ifnet *ife_ifnet; 649 struct cdev *ife_dev; 650}; 651 652struct ifnet *ifnet_byindex(u_short idx); 653 654/* 655 * Given the index, ifaddr_byindex() returns the one and only 656 * link-level ifaddr for the interface. You are not supposed to use 657 * it to traverse the list of addresses associated to the interface. 658 */ 659struct ifaddr *ifaddr_byindex(u_short idx); 660struct cdev *ifdev_byindex(u_short idx); 661 662#ifdef VIMAGE_GLOBALS 663extern struct ifnethead ifnet; 664extern struct ifnet *loif; /* first loopback interface */ 665extern int if_index; 666#endif 667extern int ifqmaxlen; 668 669int if_addgroup(struct ifnet *, const char *); 670int if_delgroup(struct ifnet *, const char *); 671int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 672int if_allmulti(struct ifnet *, int); 673struct ifnet* if_alloc(u_char); 674void if_attach(struct ifnet *); 675int if_delmulti(struct ifnet *, struct sockaddr *); 676void if_delmulti_ifma(struct ifmultiaddr *); 677void if_detach(struct ifnet *); 678void if_purgeaddrs(struct ifnet *); 679void if_purgemaddrs(struct ifnet *); 680void if_down(struct ifnet *); 681struct ifmultiaddr * 682 if_findmulti(struct ifnet *, struct sockaddr *); 683void if_free(struct ifnet *); 684void if_free_type(struct ifnet *, u_char); 685void if_initname(struct ifnet *, const char *, int); 686void if_link_state_change(struct ifnet *, int); 687int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 688int if_setlladdr(struct ifnet *, const u_char *, int); 689void if_up(struct ifnet *); 690/*void ifinit(void);*/ /* declared in systm.h for main() */ 691int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 692int ifpromisc(struct ifnet *, int); 693struct ifnet *ifunit(const char *); 694 695void ifq_attach(struct ifaltq *, struct ifnet *ifp); 696void ifq_detach(struct ifaltq *); 697 698struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 699struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *); 700struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 701struct ifaddr *ifa_ifwithnet(struct sockaddr *); 702struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 703struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int); 704 705struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 706 707int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 708 709typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp); 710typedef void if_com_free_t(void *com, u_char type); 711void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f); 712void if_deregister_com_alloc(u_char type); 713 714#define IF_LLADDR(ifp) \ 715 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr)) 716 717#ifdef DEVICE_POLLING 718enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS }; 719 720typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 721int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 722int ether_poll_deregister(struct ifnet *ifp); 723#endif /* DEVICE_POLLING */ 724 725#endif /* _KERNEL */ 726 727#endif /* !_NET_IF_VAR_H_ */ 728