ifq.h revision 189230
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 189230 2009-03-01 12:42:54Z rwatson $ 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#include <sys/buf_ring.h> 81#endif /* _KERNEL */ 82#include <sys/lock.h> /* XXX */ 83#include <sys/mutex.h> /* XXX */ 84#include <sys/rwlock.h> /* XXX */ 85#include <sys/event.h> /* XXX */ 86#include <sys/_task.h> 87 88#define IF_DUNIT_NONE -1 89 90#include <altq/if_altq.h> 91 92TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 93TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */ 94TAILQ_HEAD(ifprefixhead, ifprefix); 95TAILQ_HEAD(ifmultihead, ifmultiaddr); 96TAILQ_HEAD(ifgrouphead, ifg_group); 97 98/* 99 * Structure defining a queue for a network interface. 100 */ 101struct ifqueue { 102 struct mbuf *ifq_head; 103 struct mbuf *ifq_tail; 104 int ifq_len; 105 int ifq_maxlen; 106 int ifq_drops; 107 struct mtx ifq_mtx; 108}; 109 110/* 111 * Structure defining a network interface. 112 * 113 * (Would like to call this struct ``if'', but C isn't PL/1.) 114 */ 115 116struct ifnet { 117 void *if_softc; /* pointer to driver state */ 118 void *if_l2com; /* pointer to protocol bits */ 119 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 120 char if_xname[IFNAMSIZ]; /* external name (name + unit) */ 121 const char *if_dname; /* driver name */ 122 int if_dunit; /* unit or IF_DUNIT_NONE */ 123 struct ifaddrhead if_addrhead; /* linked list of addresses per if */ 124 /* 125 * if_addrhead is the list of all addresses associated to 126 * an interface. 127 * Some code in the kernel assumes that first element 128 * of the list has type AF_LINK, and contains sockaddr_dl 129 * addresses which store the link-level address and the name 130 * of the interface. 131 * However, access to the AF_LINK address through this 132 * field is deprecated. Use if_addr or ifaddr_byindex() instead. 133 */ 134 struct knlist if_klist; /* events attached to this if */ 135 int if_pcount; /* number of promiscuous listeners */ 136 struct carp_if *if_carp; /* carp interface structure */ 137 struct bpf_if *if_bpf; /* packet filter structure */ 138 u_short if_index; /* numeric abbreviation for this if */ 139 short if_timer; /* time 'til if_watchdog called */ 140 struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */ 141 int if_flags; /* up/down, broadcast, etc. */ 142 int if_capabilities; /* interface features & capabilities */ 143 int if_capenable; /* enabled features & capabilities */ 144 void *if_linkmib; /* link-type-specific MIB data */ 145 size_t if_linkmiblen; /* length of above data */ 146 struct if_data if_data; 147 struct ifmultihead if_multiaddrs; /* multicast addresses configured */ 148 int if_amcount; /* number of all-multicast requests */ 149/* procedure handles */ 150 int (*if_output) /* output routine (enqueue) */ 151 (struct ifnet *, struct mbuf *, struct sockaddr *, 152 struct rtentry *); 153 void (*if_input) /* input routine (from h/w driver) */ 154 (struct ifnet *, struct mbuf *); 155 void (*if_start) /* initiate output routine */ 156 (struct ifnet *); 157 int (*if_ioctl) /* ioctl routine */ 158 (struct ifnet *, u_long, caddr_t); 159 void (*if_watchdog) /* timer routine */ 160 (struct ifnet *); 161 void (*if_init) /* Init routine */ 162 (void *); 163 int (*if_resolvemulti) /* validate/resolve multicast */ 164 (struct ifnet *, struct sockaddr **, struct sockaddr *); 165 void (*if_qflush) /* flush any queues */ 166 (struct ifnet *); 167 int (*if_transmit) /* initiate output routine */ 168 (struct ifnet *, struct mbuf *); 169 struct ifaddr *if_addr; /* pointer to link-level address */ 170 void *if_llsoftc; /* link layer softc */ 171 int if_drv_flags; /* driver-managed status flags */ 172 struct ifaltq if_snd; /* output queue (includes altq) */ 173 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */ 174 175 void *if_bridge; /* bridge glue */ 176 177 struct label *if_label; /* interface MAC label */ 178 179 /* these are only used by IPv6 */ 180 struct ifprefixhead if_prefixhead; /* list of prefixes per if */ 181 void *if_afdata[AF_MAX]; 182 int if_afdata_initialized; 183 struct rwlock if_afdata_lock; 184 struct task if_starttask; /* task for IFF_NEEDSGIANT */ 185 struct task if_linktask; /* task for link change events */ 186 struct mtx if_addr_mtx; /* mutex to protect address lists */ 187 188 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */ 189 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */ 190 /* protected by if_addr_mtx */ 191 void *if_pf_kif; 192 void *if_lagg; /* lagg glue */ 193 194 /* 195 * Spare fields are added so that we can modify sensitive data 196 * structures without changing the kernel binary interface, and must 197 * be used with care where binary compatibility is required. 198 */ 199 void *if_pspare[8]; 200 int if_ispare[4]; 201}; 202 203typedef void if_init_f_t(void *); 204 205/* 206 * XXX These aliases are terribly dangerous because they could apply 207 * to anything. 208 */ 209#define if_mtu if_data.ifi_mtu 210#define if_type if_data.ifi_type 211#define if_physical if_data.ifi_physical 212#define if_addrlen if_data.ifi_addrlen 213#define if_hdrlen if_data.ifi_hdrlen 214#define if_metric if_data.ifi_metric 215#define if_link_state if_data.ifi_link_state 216#define if_baudrate if_data.ifi_baudrate 217#define if_hwassist if_data.ifi_hwassist 218#define if_ipackets if_data.ifi_ipackets 219#define if_ierrors if_data.ifi_ierrors 220#define if_opackets if_data.ifi_opackets 221#define if_oerrors if_data.ifi_oerrors 222#define if_collisions if_data.ifi_collisions 223#define if_ibytes if_data.ifi_ibytes 224#define if_obytes if_data.ifi_obytes 225#define if_imcasts if_data.ifi_imcasts 226#define if_omcasts if_data.ifi_omcasts 227#define if_iqdrops if_data.ifi_iqdrops 228#define if_noproto if_data.ifi_noproto 229#define if_lastchange if_data.ifi_lastchange 230#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)NULL) 231 232/* for compatibility with other BSDs */ 233#define if_addrlist if_addrhead 234#define if_list if_link 235#define if_name(ifp) ((ifp)->if_xname) 236 237/* 238 * Locks for address lists on the network interface. 239 */ 240#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \ 241 "if_addr_mtx", NULL, MTX_DEF) 242#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx) 243#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx) 244#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx) 245#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED) 246 247/* 248 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 249 * are queues of messages stored on ifqueue structures 250 * (defined above). Entries are added to and deleted from these structures 251 * by these macros, which should be called with ipl raised to splimp(). 252 */ 253#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 254#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 255#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 256#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 257#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 258#define _IF_QLEN(ifq) ((ifq)->ifq_len) 259 260#define _IF_ENQUEUE(ifq, m) do { \ 261 (m)->m_nextpkt = NULL; \ 262 if ((ifq)->ifq_tail == NULL) \ 263 (ifq)->ifq_head = m; \ 264 else \ 265 (ifq)->ifq_tail->m_nextpkt = m; \ 266 (ifq)->ifq_tail = m; \ 267 (ifq)->ifq_len++; \ 268} while (0) 269 270#define IF_ENQUEUE(ifq, m) do { \ 271 IF_LOCK(ifq); \ 272 _IF_ENQUEUE(ifq, m); \ 273 IF_UNLOCK(ifq); \ 274} while (0) 275 276#define _IF_PREPEND(ifq, m) do { \ 277 (m)->m_nextpkt = (ifq)->ifq_head; \ 278 if ((ifq)->ifq_tail == NULL) \ 279 (ifq)->ifq_tail = (m); \ 280 (ifq)->ifq_head = (m); \ 281 (ifq)->ifq_len++; \ 282} while (0) 283 284#define IF_PREPEND(ifq, m) do { \ 285 IF_LOCK(ifq); \ 286 _IF_PREPEND(ifq, m); \ 287 IF_UNLOCK(ifq); \ 288} while (0) 289 290#define _IF_DEQUEUE(ifq, m) do { \ 291 (m) = (ifq)->ifq_head; \ 292 if (m) { \ 293 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \ 294 (ifq)->ifq_tail = NULL; \ 295 (m)->m_nextpkt = NULL; \ 296 (ifq)->ifq_len--; \ 297 } \ 298} while (0) 299 300#define IF_DEQUEUE(ifq, m) do { \ 301 IF_LOCK(ifq); \ 302 _IF_DEQUEUE(ifq, m); \ 303 IF_UNLOCK(ifq); \ 304} while (0) 305 306#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 307#define IF_POLL(ifq, m) _IF_POLL(ifq, m) 308 309#define _IF_DRAIN(ifq) do { \ 310 struct mbuf *m; \ 311 for (;;) { \ 312 _IF_DEQUEUE(ifq, m); \ 313 if (m == NULL) \ 314 break; \ 315 m_freem(m); \ 316 } \ 317} while (0) 318 319#define IF_DRAIN(ifq) do { \ 320 IF_LOCK(ifq); \ 321 _IF_DRAIN(ifq); \ 322 IF_UNLOCK(ifq); \ 323} while(0) 324 325#ifdef _KERNEL 326/* interface address change event */ 327typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 328EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 329/* new interface arrival event */ 330typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 331EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 332/* interface departure event */ 333typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 334EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 335 336/* 337 * interface groups 338 */ 339struct ifg_group { 340 char ifg_group[IFNAMSIZ]; 341 u_int ifg_refcnt; 342 void *ifg_pf_kif; 343 TAILQ_HEAD(, ifg_member) ifg_members; 344 TAILQ_ENTRY(ifg_group) ifg_next; 345}; 346 347struct ifg_member { 348 TAILQ_ENTRY(ifg_member) ifgm_next; 349 struct ifnet *ifgm_ifp; 350}; 351 352struct ifg_list { 353 struct ifg_group *ifgl_group; 354 TAILQ_ENTRY(ifg_list) ifgl_next; 355}; 356 357/* group attach event */ 358typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *); 359EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t); 360/* group detach event */ 361typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *); 362EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t); 363/* group change event */ 364typedef void (*group_change_event_handler_t)(void *, const char *); 365EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t); 366 367#define IF_AFDATA_LOCK_INIT(ifp) \ 368 rw_init(&(ifp)->if_afdata_lock, "if_afdata") 369 370#define IF_AFDATA_WLOCK(ifp) rw_wlock(&(ifp)->if_afdata_lock) 371#define IF_AFDATA_RLOCK(ifp) rw_rlock(&(ifp)->if_afdata_lock) 372#define IF_AFDATA_WUNLOCK(ifp) rw_wunlock(&(ifp)->if_afdata_lock) 373#define IF_AFDATA_RUNLOCK(ifp) rw_runlock(&(ifp)->if_afdata_lock) 374#define IF_AFDATA_LOCK(ifp) IF_AFDATA_WLOCK(ifp) 375#define IF_AFDATA_UNLOCK(ifp) IF_AFDATA_WUNLOCK(ifp) 376#define IF_AFDATA_TRYLOCK(ifp) rw_try_wlock(&(ifp)->if_afdata_lock) 377#define IF_AFDATA_DESTROY(ifp) rw_destroy(&(ifp)->if_afdata_lock) 378 379#define IF_AFDATA_LOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED) 380#define IF_AFDATA_UNLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED) 381 382#define IFF_LOCKGIANT(ifp) do { \ 383 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 384 mtx_lock(&Giant); \ 385} while (0) 386 387#define IFF_UNLOCKGIANT(ifp) do { \ 388 if ((ifp)->if_flags & IFF_NEEDSGIANT) \ 389 mtx_unlock(&Giant); \ 390} while (0) 391 392int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, 393 int adjust); 394#define IF_HANDOFF(ifq, m, ifp) \ 395 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 396#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 397 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 398 399void if_start(struct ifnet *); 400 401#define IFQ_ENQUEUE(ifq, m, err) \ 402do { \ 403 IF_LOCK(ifq); \ 404 if (ALTQ_IS_ENABLED(ifq)) \ 405 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 406 else { \ 407 if (_IF_QFULL(ifq)) { \ 408 m_freem(m); \ 409 (err) = ENOBUFS; \ 410 } else { \ 411 _IF_ENQUEUE(ifq, m); \ 412 (err) = 0; \ 413 } \ 414 } \ 415 if (err) \ 416 (ifq)->ifq_drops++; \ 417 IF_UNLOCK(ifq); \ 418} while (0) 419 420#define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 421do { \ 422 if (TBR_IS_ENABLED(ifq)) \ 423 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 424 else if (ALTQ_IS_ENABLED(ifq)) \ 425 ALTQ_DEQUEUE(ifq, m); \ 426 else \ 427 _IF_DEQUEUE(ifq, m); \ 428} while (0) 429 430#define IFQ_DEQUEUE(ifq, m) \ 431do { \ 432 IF_LOCK(ifq); \ 433 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 434 IF_UNLOCK(ifq); \ 435} while (0) 436 437#define IFQ_POLL_NOLOCK(ifq, m) \ 438do { \ 439 if (TBR_IS_ENABLED(ifq)) \ 440 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 441 else if (ALTQ_IS_ENABLED(ifq)) \ 442 ALTQ_POLL(ifq, m); \ 443 else \ 444 _IF_POLL(ifq, m); \ 445} while (0) 446 447#define IFQ_POLL(ifq, m) \ 448do { \ 449 IF_LOCK(ifq); \ 450 IFQ_POLL_NOLOCK(ifq, m); \ 451 IF_UNLOCK(ifq); \ 452} while (0) 453 454#define IFQ_PURGE_NOLOCK(ifq) \ 455do { \ 456 if (ALTQ_IS_ENABLED(ifq)) { \ 457 ALTQ_PURGE(ifq); \ 458 } else \ 459 _IF_DRAIN(ifq); \ 460} while (0) 461 462#define IFQ_PURGE(ifq) \ 463do { \ 464 IF_LOCK(ifq); \ 465 IFQ_PURGE_NOLOCK(ifq); \ 466 IF_UNLOCK(ifq); \ 467} while (0) 468 469#define IFQ_SET_READY(ifq) \ 470 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 471 472#define IFQ_LOCK(ifq) IF_LOCK(ifq) 473#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq) 474#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq) 475#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0) 476#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++) 477#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len) 478#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++) 479#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len)) 480 481/* 482 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in 483 * the handoff logic, as that flag is locked by the device driver. 484 */ 485#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \ 486do { \ 487 int len; \ 488 short mflags; \ 489 \ 490 len = (m)->m_pkthdr.len; \ 491 mflags = (m)->m_flags; \ 492 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \ 493 if ((err) == 0) { \ 494 (ifp)->if_obytes += len + (adj); \ 495 if (mflags & M_MCAST) \ 496 (ifp)->if_omcasts++; \ 497 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \ 498 if_start(ifp); \ 499 } \ 500} while (0) 501 502#define IFQ_HANDOFF(ifp, m, err) \ 503 IFQ_HANDOFF_ADJ(ifp, m, 0, err) 504 505#define IFQ_DRV_DEQUEUE(ifq, m) \ 506do { \ 507 (m) = (ifq)->ifq_drv_head; \ 508 if (m) { \ 509 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \ 510 (ifq)->ifq_drv_tail = NULL; \ 511 (m)->m_nextpkt = NULL; \ 512 (ifq)->ifq_drv_len--; \ 513 } else { \ 514 IFQ_LOCK(ifq); \ 515 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 516 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \ 517 struct mbuf *m0; \ 518 IFQ_DEQUEUE_NOLOCK(ifq, m0); \ 519 if (m0 == NULL) \ 520 break; \ 521 m0->m_nextpkt = NULL; \ 522 if ((ifq)->ifq_drv_tail == NULL) \ 523 (ifq)->ifq_drv_head = m0; \ 524 else \ 525 (ifq)->ifq_drv_tail->m_nextpkt = m0; \ 526 (ifq)->ifq_drv_tail = m0; \ 527 (ifq)->ifq_drv_len++; \ 528 } \ 529 IFQ_UNLOCK(ifq); \ 530 } \ 531} while (0) 532 533#define IFQ_DRV_PREPEND(ifq, m) \ 534do { \ 535 (m)->m_nextpkt = (ifq)->ifq_drv_head; \ 536 if ((ifq)->ifq_drv_tail == NULL) \ 537 (ifq)->ifq_drv_tail = (m); \ 538 (ifq)->ifq_drv_head = (m); \ 539 (ifq)->ifq_drv_len++; \ 540} while (0) 541 542#define IFQ_DRV_IS_EMPTY(ifq) \ 543 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0)) 544 545#define IFQ_DRV_PURGE(ifq) \ 546do { \ 547 struct mbuf *m, *n = (ifq)->ifq_drv_head; \ 548 while((m = n) != NULL) { \ 549 n = m->m_nextpkt; \ 550 m_freem(m); \ 551 } \ 552 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \ 553 (ifq)->ifq_drv_len = 0; \ 554 IFQ_PURGE(ifq); \ 555} while (0) 556 557#ifdef _KERNEL 558static __inline void 559drbr_stats_update(struct ifnet *ifp, int len, int mflags) 560{ 561 562 ifp->if_obytes += len; 563 if (mflags & M_MCAST) 564 ifp->if_omcasts++; 565} 566 567static __inline int 568drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m) 569{ 570 int error = 0; 571 int len = m->m_pkthdr.len; 572 int mflags = m->m_flags; 573 574 if ((error = buf_ring_enqueue(br, m)) == ENOBUFS) { 575 br->br_drops++; 576 _IF_DROP(&ifp->if_snd); 577 m_freem(m); 578 } else 579 drbr_stats_update(ifp, len, mflags); 580 581 return (error); 582} 583 584static __inline void 585drbr_free(struct buf_ring *br, struct malloc_type *type) 586{ 587 struct mbuf *m; 588 589 while ((m = buf_ring_dequeue_sc(br)) != NULL) 590 m_freem(m); 591 592 buf_ring_free(br, type); 593} 594#endif 595 596/* 597 * 72 was chosen below because it is the size of a TCP/IP 598 * header (40) + the minimum mss (32). 599 */ 600#define IF_MINMTU 72 601#define IF_MAXMTU 65535 602 603#endif /* _KERNEL */ 604 605/* 606 * The ifaddr structure contains information about one address 607 * of an interface. They are maintained by the different address families, 608 * are allocated and attached when an address is set, and are linked 609 * together so all addresses for an interface can be located. 610 * 611 * NOTE: a 'struct ifaddr' is always at the beginning of a larger 612 * chunk of malloc'ed memory, where we store the three addresses 613 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here. 614 */ 615struct ifaddr { 616 struct sockaddr *ifa_addr; /* address of interface */ 617 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 618#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 619 struct sockaddr *ifa_netmask; /* used to determine subnet */ 620 struct if_data if_data; /* not all members are meaningful */ 621 struct ifnet *ifa_ifp; /* back-pointer to interface */ 622 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 623 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 624 (int, struct rtentry *, struct rt_addrinfo *); 625 u_short ifa_flags; /* mostly rt_flags for cloning */ 626 u_int ifa_refcnt; /* references to this structure */ 627 int ifa_metric; /* cost of going out this interface */ 628 int (*ifa_claim_addr) /* check if an addr goes to this if */ 629 (struct ifaddr *, struct sockaddr *); 630 struct mtx ifa_mtx; 631}; 632#define IFA_ROUTE RTF_UP /* route installed */ 633 634/* for compatibility with other BSDs */ 635#define ifa_list ifa_link 636 637#define IFA_LOCK_INIT(ifa) \ 638 mtx_init(&(ifa)->ifa_mtx, "ifaddr", NULL, MTX_DEF) 639#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx) 640#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx) 641#define IFA_DESTROY(ifa) mtx_destroy(&(ifa)->ifa_mtx) 642 643/* 644 * The prefix structure contains information about one prefix 645 * of an interface. They are maintained by the different address families, 646 * are allocated and attached when a prefix or an address is set, 647 * and are linked together so all prefixes for an interface can be located. 648 */ 649struct ifprefix { 650 struct sockaddr *ifpr_prefix; /* prefix of interface */ 651 struct ifnet *ifpr_ifp; /* back-pointer to interface */ 652 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */ 653 u_char ifpr_plen; /* prefix length in bits */ 654 u_char ifpr_type; /* protocol dependent prefix type */ 655}; 656 657/* 658 * Multicast address structure. This is analogous to the ifaddr 659 * structure except that it keeps track of multicast addresses. 660 */ 661struct ifmultiaddr { 662 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 663 struct sockaddr *ifma_addr; /* address this membership is for */ 664 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 665 struct ifnet *ifma_ifp; /* back-pointer to interface */ 666 u_int ifma_refcount; /* reference count */ 667 void *ifma_protospec; /* protocol-specific state, if any */ 668 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */ 669}; 670 671#ifdef _KERNEL 672#define IFAFREE(ifa) \ 673 do { \ 674 IFA_LOCK(ifa); \ 675 KASSERT((ifa)->ifa_refcnt > 0, \ 676 ("ifa %p !(ifa_refcnt > 0)", ifa)); \ 677 if (--(ifa)->ifa_refcnt == 0) { \ 678 IFA_DESTROY(ifa); \ 679 free(ifa, M_IFADDR); \ 680 } else \ 681 IFA_UNLOCK(ifa); \ 682 } while (0) 683 684#define IFAREF(ifa) \ 685 do { \ 686 IFA_LOCK(ifa); \ 687 ++(ifa)->ifa_refcnt; \ 688 IFA_UNLOCK(ifa); \ 689 } while (0) 690 691extern struct rwlock ifnet_lock; 692#define IFNET_LOCK_INIT() \ 693 rw_init_flags(&ifnet_lock, "ifnet", RW_RECURSE) 694#define IFNET_WLOCK() rw_wlock(&ifnet_lock) 695#define IFNET_WUNLOCK() rw_wunlock(&ifnet_lock) 696#define IFNET_WLOCK_ASSERT() rw_assert(&ifnet_lock, RA_LOCKED) 697#define IFNET_RLOCK() rw_rlock(&ifnet_lock) 698#define IFNET_RUNLOCK() rw_runlock(&ifnet_lock) 699 700struct ifindex_entry { 701 struct ifnet *ife_ifnet; 702 struct cdev *ife_dev; 703}; 704 705struct ifnet *ifnet_byindex(u_short idx); 706 707/* 708 * Given the index, ifaddr_byindex() returns the one and only 709 * link-level ifaddr for the interface. You are not supposed to use 710 * it to traverse the list of addresses associated to the interface. 711 */ 712struct ifaddr *ifaddr_byindex(u_short idx); 713struct cdev *ifdev_byindex(u_short idx); 714 715#ifdef VIMAGE_GLOBALS 716extern struct ifnethead ifnet; 717extern struct ifnet *loif; /* first loopback interface */ 718extern int if_index; 719#endif 720extern int ifqmaxlen; 721 722int if_addgroup(struct ifnet *, const char *); 723int if_delgroup(struct ifnet *, const char *); 724int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 725int if_allmulti(struct ifnet *, int); 726struct ifnet* if_alloc(u_char); 727void if_attach(struct ifnet *); 728int if_delmulti(struct ifnet *, struct sockaddr *); 729void if_delmulti_ifma(struct ifmultiaddr *); 730void if_detach(struct ifnet *); 731void if_purgeaddrs(struct ifnet *); 732void if_purgemaddrs(struct ifnet *); 733void if_down(struct ifnet *); 734struct ifmultiaddr * 735 if_findmulti(struct ifnet *, struct sockaddr *); 736void if_free(struct ifnet *); 737void if_free_type(struct ifnet *, u_char); 738void if_initname(struct ifnet *, const char *, int); 739void if_link_state_change(struct ifnet *, int); 740int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 741int if_setlladdr(struct ifnet *, const u_char *, int); 742void if_up(struct ifnet *); 743/*void ifinit(void);*/ /* declared in systm.h for main() */ 744int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 745int ifpromisc(struct ifnet *, int); 746struct ifnet *ifunit(const char *); 747 748void ifq_attach(struct ifaltq *, struct ifnet *ifp); 749void ifq_detach(struct ifaltq *); 750 751struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 752struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *); 753struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 754struct ifaddr *ifa_ifwithnet(struct sockaddr *); 755struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 756struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int); 757 758struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 759 760int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 761 762typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp); 763typedef void if_com_free_t(void *com, u_char type); 764void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f); 765void if_deregister_com_alloc(u_char type); 766 767#define IF_LLADDR(ifp) \ 768 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr)) 769 770#ifdef DEVICE_POLLING 771enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS }; 772 773typedef void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 774int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 775int ether_poll_deregister(struct ifnet *ifp); 776#endif /* DEVICE_POLLING */ 777 778#endif /* _KERNEL */ 779 780#endif /* !_NET_IF_VAR_H_ */ 781