ifq.h revision 228571
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 228571 2011-12-16 12:16:56Z glebius $ 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 carp_softc; 73struct ifvlantrunk; 74struct route; 75struct vnet; 76#endif 77 78#include <sys/queue.h> /* get TAILQ macros */ 79 80#ifdef _KERNEL 81#include <sys/mbuf.h> 82#include <sys/eventhandler.h> 83#include <sys/buf_ring.h> 84#include <net/vnet.h> 85#endif /* _KERNEL */ 86#include <sys/lock.h> /* XXX */ 87#include <sys/mutex.h> /* XXX */ 88#include <sys/rwlock.h> /* XXX */ 89#include <sys/sx.h> /* XXX */ 90#include <sys/event.h> /* XXX */ 91#include <sys/_task.h> 92 93#define IF_DUNIT_NONE -1 94 95#include <altq/if_altq.h> 96 97TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 98TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */ 99TAILQ_HEAD(ifprefixhead, ifprefix); 100TAILQ_HEAD(ifmultihead, ifmultiaddr); 101TAILQ_HEAD(ifgrouphead, ifg_group); 102 103/* 104 * Structure defining a queue for a network interface. 105 */ 106struct ifqueue { 107 struct mbuf *ifq_head; 108 struct mbuf *ifq_tail; 109 int ifq_len; 110 int ifq_maxlen; 111 int ifq_drops; 112 struct mtx ifq_mtx; 113}; 114 115/* 116 * Structure defining a network interface. 117 * 118 * (Would like to call this struct ``if'', but C isn't PL/1.) 119 */ 120 121struct ifnet { 122 void *if_softc; /* pointer to driver state */ 123 void *if_l2com; /* pointer to protocol bits */ 124 struct vnet *if_vnet; /* pointer to network stack instance */ 125 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 126 char if_xname[IFNAMSIZ]; /* external name (name + unit) */ 127 const char *if_dname; /* driver name */ 128 int if_dunit; /* unit or IF_DUNIT_NONE */ 129 u_int if_refcount; /* reference count */ 130 struct ifaddrhead if_addrhead; /* linked list of addresses per if */ 131 /* 132 * if_addrhead is the list of all addresses associated to 133 * an interface. 134 * Some code in the kernel assumes that first element 135 * of the list has type AF_LINK, and contains sockaddr_dl 136 * addresses which store the link-level address and the name 137 * of the interface. 138 * However, access to the AF_LINK address through this 139 * field is deprecated. Use if_addr or ifaddr_byindex() instead. 140 */ 141 int if_pcount; /* number of promiscuous listeners */ 142 struct carp_if *if_carp; /* carp interface structure */ 143 struct bpf_if *if_bpf; /* packet filter structure */ 144 u_short if_index; /* numeric abbreviation for this if */ 145 short if_index_reserved; /* spare space to grow if_index */ 146 struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */ 147 int if_flags; /* up/down, broadcast, etc. */ 148 int if_capabilities; /* interface features & capabilities */ 149 int if_capenable; /* enabled features & capabilities */ 150 void *if_linkmib; /* link-type-specific MIB data */ 151 size_t if_linkmiblen; /* length of above data */ 152 struct if_data if_data; 153 struct ifmultihead if_multiaddrs; /* multicast addresses configured */ 154 int if_amcount; /* number of all-multicast requests */ 155/* procedure handles */ 156 int (*if_output) /* output routine (enqueue) */ 157 (struct ifnet *, struct mbuf *, struct sockaddr *, 158 struct route *); 159 void (*if_input) /* input routine (from h/w driver) */ 160 (struct ifnet *, struct mbuf *); 161 void (*if_start) /* initiate output routine */ 162 (struct ifnet *); 163 int (*if_ioctl) /* ioctl routine */ 164 (struct ifnet *, u_long, caddr_t); 165 void (*if_init) /* Init routine */ 166 (void *); 167 int (*if_resolvemulti) /* validate/resolve multicast */ 168 (struct ifnet *, struct sockaddr **, struct sockaddr *); 169 void (*if_qflush) /* flush any queues */ 170 (struct ifnet *); 171 int (*if_transmit) /* initiate output routine */ 172 (struct ifnet *, struct mbuf *); 173 void (*if_reassign) /* reassign to vnet routine */ 174 (struct ifnet *, struct vnet *, char *); 175 struct vnet *if_home_vnet; /* where this ifnet originates from */ 176 struct ifaddr *if_addr; /* pointer to link-level address */ 177 void *if_llsoftc; /* link layer softc */ 178 int if_drv_flags; /* driver-managed status flags */ 179 struct ifaltq if_snd; /* output queue (includes altq) */ 180 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */ 181 182 void *if_bridge; /* bridge glue */ 183 184 struct label *if_label; /* interface MAC label */ 185 186 /* these are only used by IPv6 */ 187 struct ifprefixhead if_prefixhead; /* list of prefixes per if */ 188 void *if_afdata[AF_MAX]; 189 int if_afdata_initialized; 190 struct rwlock if_afdata_lock; 191 struct task if_linktask; /* task for link change events */ 192 struct mtx if_addr_mtx; /* mutex to protect address lists */ 193 194 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */ 195 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */ 196 /* protected by if_addr_mtx */ 197 void *if_pf_kif; 198 void *if_lagg; /* lagg glue */ 199 char *if_description; /* interface description */ 200 u_int if_fib; /* interface FIB */ 201 u_char if_alloctype; /* if_type at time of allocation */ 202 203 /* 204 * Spare fields are added so that we can modify sensitive data 205 * structures without changing the kernel binary interface, and must 206 * be used with care where binary compatibility is required. 207 */ 208 char if_cspare[3]; 209 int if_ispare[4]; 210 void *if_pspare[8]; /* 1 netmap, 7 TDB */ 211}; 212 213typedef void if_init_f_t(void *); 214 215/* 216 * XXX These aliases are terribly dangerous because they could apply 217 * to anything. 218 */ 219#define if_mtu if_data.ifi_mtu 220#define if_type if_data.ifi_type 221#define if_physical if_data.ifi_physical 222#define if_addrlen if_data.ifi_addrlen 223#define if_hdrlen if_data.ifi_hdrlen 224#define if_metric if_data.ifi_metric 225#define if_link_state if_data.ifi_link_state 226#define if_baudrate if_data.ifi_baudrate 227#define if_hwassist if_data.ifi_hwassist 228#define if_ipackets if_data.ifi_ipackets 229#define if_ierrors if_data.ifi_ierrors 230#define if_opackets if_data.ifi_opackets 231#define if_oerrors if_data.ifi_oerrors 232#define if_collisions if_data.ifi_collisions 233#define if_ibytes if_data.ifi_ibytes 234#define if_obytes if_data.ifi_obytes 235#define if_imcasts if_data.ifi_imcasts 236#define if_omcasts if_data.ifi_omcasts 237#define if_iqdrops if_data.ifi_iqdrops 238#define if_noproto if_data.ifi_noproto 239#define if_lastchange if_data.ifi_lastchange 240 241/* for compatibility with other BSDs */ 242#define if_addrlist if_addrhead 243#define if_list if_link 244#define if_name(ifp) ((ifp)->if_xname) 245 246/* 247 * Locks for address lists on the network interface. 248 */ 249#define IF_ADDR_LOCK_INIT(if) mtx_init(&(if)->if_addr_mtx, \ 250 "if_addr_mtx", NULL, MTX_DEF) 251#define IF_ADDR_LOCK_DESTROY(if) mtx_destroy(&(if)->if_addr_mtx) 252#define IF_ADDR_LOCK(if) mtx_lock(&(if)->if_addr_mtx) 253#define IF_ADDR_UNLOCK(if) mtx_unlock(&(if)->if_addr_mtx) 254#define IF_ADDR_LOCK_ASSERT(if) mtx_assert(&(if)->if_addr_mtx, MA_OWNED) 255 256/* 257 * Function variations on locking macros intended to be used by loadable 258 * kernel modules in order to divorce them from the internals of address list 259 * locking. 260 */ 261void if_addr_rlock(struct ifnet *ifp); /* if_addrhead */ 262void if_addr_runlock(struct ifnet *ifp); /* if_addrhead */ 263void if_maddr_rlock(struct ifnet *ifp); /* if_multiaddrs */ 264void if_maddr_runlock(struct ifnet *ifp); /* if_multiaddrs */ 265 266/* 267 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 268 * are queues of messages stored on ifqueue structures 269 * (defined above). Entries are added to and deleted from these structures 270 * by these macros, which should be called with ipl raised to splimp(). 271 */ 272#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 273#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 274#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 275#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 276#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 277#define _IF_QLEN(ifq) ((ifq)->ifq_len) 278 279#define _IF_ENQUEUE(ifq, m) do { \ 280 (m)->m_nextpkt = NULL; \ 281 if ((ifq)->ifq_tail == NULL) \ 282 (ifq)->ifq_head = m; \ 283 else \ 284 (ifq)->ifq_tail->m_nextpkt = m; \ 285 (ifq)->ifq_tail = m; \ 286 (ifq)->ifq_len++; \ 287} while (0) 288 289#define IF_ENQUEUE(ifq, m) do { \ 290 IF_LOCK(ifq); \ 291 _IF_ENQUEUE(ifq, m); \ 292 IF_UNLOCK(ifq); \ 293} while (0) 294 295#define _IF_PREPEND(ifq, m) do { \ 296 (m)->m_nextpkt = (ifq)->ifq_head; \ 297 if ((ifq)->ifq_tail == NULL) \ 298 (ifq)->ifq_tail = (m); \ 299 (ifq)->ifq_head = (m); \ 300 (ifq)->ifq_len++; \ 301} while (0) 302 303#define IF_PREPEND(ifq, m) do { \ 304 IF_LOCK(ifq); \ 305 _IF_PREPEND(ifq, m); \ 306 IF_UNLOCK(ifq); \ 307} while (0) 308 309#define _IF_DEQUEUE(ifq, m) do { \ 310 (m) = (ifq)->ifq_head; \ 311 if (m) { \ 312 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \ 313 (ifq)->ifq_tail = NULL; \ 314 (m)->m_nextpkt = NULL; \ 315 (ifq)->ifq_len--; \ 316 } \ 317} while (0) 318 319#define IF_DEQUEUE(ifq, m) do { \ 320 IF_LOCK(ifq); \ 321 _IF_DEQUEUE(ifq, m); \ 322 IF_UNLOCK(ifq); \ 323} while (0) 324 325#define _IF_DEQUEUE_ALL(ifq, m) do { \ 326 (m) = (ifq)->ifq_head; \ 327 (ifq)->ifq_head = (ifq)->ifq_tail = NULL; \ 328 (ifq)->ifq_len = 0; \ 329} while (0) 330 331#define IF_DEQUEUE_ALL(ifq, m) do { \ 332 IF_LOCK(ifq); \ 333 _IF_DEQUEUE_ALL(ifq, m); \ 334 IF_UNLOCK(ifq); \ 335} while (0) 336 337#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 338#define IF_POLL(ifq, m) _IF_POLL(ifq, m) 339 340#define _IF_DRAIN(ifq) do { \ 341 struct mbuf *m; \ 342 for (;;) { \ 343 _IF_DEQUEUE(ifq, m); \ 344 if (m == NULL) \ 345 break; \ 346 m_freem(m); \ 347 } \ 348} while (0) 349 350#define IF_DRAIN(ifq) do { \ 351 IF_LOCK(ifq); \ 352 _IF_DRAIN(ifq); \ 353 IF_UNLOCK(ifq); \ 354} while(0) 355 356#ifdef _KERNEL 357/* interface link layer address change event */ 358typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *); 359EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t); 360/* interface address change event */ 361typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 362EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 363/* new interface arrival event */ 364typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 365EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 366/* interface departure event */ 367typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 368EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 369/* Interface link state change event */ 370typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int); 371EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t); 372 373/* 374 * interface groups 375 */ 376struct ifg_group { 377 char ifg_group[IFNAMSIZ]; 378 u_int ifg_refcnt; 379 void *ifg_pf_kif; 380 TAILQ_HEAD(, ifg_member) ifg_members; 381 TAILQ_ENTRY(ifg_group) ifg_next; 382}; 383 384struct ifg_member { 385 TAILQ_ENTRY(ifg_member) ifgm_next; 386 struct ifnet *ifgm_ifp; 387}; 388 389struct ifg_list { 390 struct ifg_group *ifgl_group; 391 TAILQ_ENTRY(ifg_list) ifgl_next; 392}; 393 394/* group attach event */ 395typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *); 396EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t); 397/* group detach event */ 398typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *); 399EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t); 400/* group change event */ 401typedef void (*group_change_event_handler_t)(void *, const char *); 402EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t); 403 404#define IF_AFDATA_LOCK_INIT(ifp) \ 405 rw_init(&(ifp)->if_afdata_lock, "if_afdata") 406 407#define IF_AFDATA_WLOCK(ifp) rw_wlock(&(ifp)->if_afdata_lock) 408#define IF_AFDATA_RLOCK(ifp) rw_rlock(&(ifp)->if_afdata_lock) 409#define IF_AFDATA_WUNLOCK(ifp) rw_wunlock(&(ifp)->if_afdata_lock) 410#define IF_AFDATA_RUNLOCK(ifp) rw_runlock(&(ifp)->if_afdata_lock) 411#define IF_AFDATA_LOCK(ifp) IF_AFDATA_WLOCK(ifp) 412#define IF_AFDATA_UNLOCK(ifp) IF_AFDATA_WUNLOCK(ifp) 413#define IF_AFDATA_TRYLOCK(ifp) rw_try_wlock(&(ifp)->if_afdata_lock) 414#define IF_AFDATA_DESTROY(ifp) rw_destroy(&(ifp)->if_afdata_lock) 415 416#define IF_AFDATA_LOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED) 417#define IF_AFDATA_UNLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED) 418 419int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, 420 int adjust); 421#define IF_HANDOFF(ifq, m, ifp) \ 422 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 423#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 424 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 425 426void if_start(struct ifnet *); 427 428#define IFQ_ENQUEUE(ifq, m, err) \ 429do { \ 430 IF_LOCK(ifq); \ 431 if (ALTQ_IS_ENABLED(ifq)) \ 432 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 433 else { \ 434 if (_IF_QFULL(ifq)) { \ 435 m_freem(m); \ 436 (err) = ENOBUFS; \ 437 } else { \ 438 _IF_ENQUEUE(ifq, m); \ 439 (err) = 0; \ 440 } \ 441 } \ 442 if (err) \ 443 (ifq)->ifq_drops++; \ 444 IF_UNLOCK(ifq); \ 445} while (0) 446 447#define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 448do { \ 449 if (TBR_IS_ENABLED(ifq)) \ 450 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 451 else if (ALTQ_IS_ENABLED(ifq)) \ 452 ALTQ_DEQUEUE(ifq, m); \ 453 else \ 454 _IF_DEQUEUE(ifq, m); \ 455} while (0) 456 457#define IFQ_DEQUEUE(ifq, m) \ 458do { \ 459 IF_LOCK(ifq); \ 460 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 461 IF_UNLOCK(ifq); \ 462} while (0) 463 464#define IFQ_POLL_NOLOCK(ifq, m) \ 465do { \ 466 if (TBR_IS_ENABLED(ifq)) \ 467 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 468 else if (ALTQ_IS_ENABLED(ifq)) \ 469 ALTQ_POLL(ifq, m); \ 470 else \ 471 _IF_POLL(ifq, m); \ 472} while (0) 473 474#define IFQ_POLL(ifq, m) \ 475do { \ 476 IF_LOCK(ifq); \ 477 IFQ_POLL_NOLOCK(ifq, m); \ 478 IF_UNLOCK(ifq); \ 479} while (0) 480 481#define IFQ_PURGE_NOLOCK(ifq) \ 482do { \ 483 if (ALTQ_IS_ENABLED(ifq)) { \ 484 ALTQ_PURGE(ifq); \ 485 } else \ 486 _IF_DRAIN(ifq); \ 487} while (0) 488 489#define IFQ_PURGE(ifq) \ 490do { \ 491 IF_LOCK(ifq); \ 492 IFQ_PURGE_NOLOCK(ifq); \ 493 IF_UNLOCK(ifq); \ 494} while (0) 495 496#define IFQ_SET_READY(ifq) \ 497 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 498 499#define IFQ_LOCK(ifq) IF_LOCK(ifq) 500#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq) 501#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq) 502#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0) 503#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++) 504#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len) 505#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++) 506#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len)) 507 508/* 509 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in 510 * the handoff logic, as that flag is locked by the device driver. 511 */ 512#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \ 513do { \ 514 int len; \ 515 short mflags; \ 516 \ 517 len = (m)->m_pkthdr.len; \ 518 mflags = (m)->m_flags; \ 519 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \ 520 if ((err) == 0) { \ 521 (ifp)->if_obytes += len + (adj); \ 522 if (mflags & M_MCAST) \ 523 (ifp)->if_omcasts++; \ 524 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \ 525 if_start(ifp); \ 526 } \ 527} while (0) 528 529#define IFQ_HANDOFF(ifp, m, err) \ 530 IFQ_HANDOFF_ADJ(ifp, m, 0, err) 531 532#define IFQ_DRV_DEQUEUE(ifq, m) \ 533do { \ 534 (m) = (ifq)->ifq_drv_head; \ 535 if (m) { \ 536 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \ 537 (ifq)->ifq_drv_tail = NULL; \ 538 (m)->m_nextpkt = NULL; \ 539 (ifq)->ifq_drv_len--; \ 540 } else { \ 541 IFQ_LOCK(ifq); \ 542 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 543 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \ 544 struct mbuf *m0; \ 545 IFQ_DEQUEUE_NOLOCK(ifq, m0); \ 546 if (m0 == NULL) \ 547 break; \ 548 m0->m_nextpkt = NULL; \ 549 if ((ifq)->ifq_drv_tail == NULL) \ 550 (ifq)->ifq_drv_head = m0; \ 551 else \ 552 (ifq)->ifq_drv_tail->m_nextpkt = m0; \ 553 (ifq)->ifq_drv_tail = m0; \ 554 (ifq)->ifq_drv_len++; \ 555 } \ 556 IFQ_UNLOCK(ifq); \ 557 } \ 558} while (0) 559 560#define IFQ_DRV_PREPEND(ifq, m) \ 561do { \ 562 (m)->m_nextpkt = (ifq)->ifq_drv_head; \ 563 if ((ifq)->ifq_drv_tail == NULL) \ 564 (ifq)->ifq_drv_tail = (m); \ 565 (ifq)->ifq_drv_head = (m); \ 566 (ifq)->ifq_drv_len++; \ 567} while (0) 568 569#define IFQ_DRV_IS_EMPTY(ifq) \ 570 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0)) 571 572#define IFQ_DRV_PURGE(ifq) \ 573do { \ 574 struct mbuf *m, *n = (ifq)->ifq_drv_head; \ 575 while((m = n) != NULL) { \ 576 n = m->m_nextpkt; \ 577 m_freem(m); \ 578 } \ 579 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \ 580 (ifq)->ifq_drv_len = 0; \ 581 IFQ_PURGE(ifq); \ 582} while (0) 583 584#ifdef _KERNEL 585static __inline void 586drbr_stats_update(struct ifnet *ifp, int len, int mflags) 587{ 588#ifndef NO_SLOW_STATS 589 ifp->if_obytes += len; 590 if (mflags & M_MCAST) 591 ifp->if_omcasts++; 592#endif 593} 594 595static __inline int 596drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m) 597{ 598 int error = 0; 599 int len = m->m_pkthdr.len; 600 int mflags = m->m_flags; 601 602#ifdef ALTQ 603 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 604 IFQ_ENQUEUE(&ifp->if_snd, m, error); 605 return (error); 606 } 607#endif 608 if ((error = buf_ring_enqueue_bytes(br, m, len)) == ENOBUFS) { 609 br->br_drops++; 610 m_freem(m); 611 } else 612 drbr_stats_update(ifp, len, mflags); 613 614 return (error); 615} 616 617static __inline void 618drbr_flush(struct ifnet *ifp, struct buf_ring *br) 619{ 620 struct mbuf *m; 621 622#ifdef ALTQ 623 if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) 624 IFQ_PURGE(&ifp->if_snd); 625#endif 626 while ((m = buf_ring_dequeue_sc(br)) != NULL) 627 m_freem(m); 628} 629 630static __inline void 631drbr_free(struct buf_ring *br, struct malloc_type *type) 632{ 633 634 drbr_flush(NULL, br); 635 buf_ring_free(br, type); 636} 637 638static __inline struct mbuf * 639drbr_dequeue(struct ifnet *ifp, struct buf_ring *br) 640{ 641#ifdef ALTQ 642 struct mbuf *m; 643 644 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 645 IFQ_DEQUEUE(&ifp->if_snd, m); 646 return (m); 647 } 648#endif 649 return (buf_ring_dequeue_sc(br)); 650} 651 652static __inline struct mbuf * 653drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br, 654 int (*func) (struct mbuf *, void *), void *arg) 655{ 656 struct mbuf *m; 657#ifdef ALTQ 658 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 659 IFQ_LOCK(&ifp->if_snd); 660 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 661 if (m != NULL && func(m, arg) == 0) { 662 IFQ_UNLOCK(&ifp->if_snd); 663 return (NULL); 664 } 665 IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m); 666 IFQ_UNLOCK(&ifp->if_snd); 667 return (m); 668 } 669#endif 670 m = buf_ring_peek(br); 671 if (m == NULL || func(m, arg) == 0) 672 return (NULL); 673 674 return (buf_ring_dequeue_sc(br)); 675} 676 677static __inline int 678drbr_empty(struct ifnet *ifp, struct buf_ring *br) 679{ 680#ifdef ALTQ 681 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 682 return (IFQ_IS_EMPTY(&ifp->if_snd)); 683#endif 684 return (buf_ring_empty(br)); 685} 686 687static __inline int 688drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br) 689{ 690#ifdef ALTQ 691 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 692 return (1); 693#endif 694 return (!buf_ring_empty(br)); 695} 696 697static __inline int 698drbr_inuse(struct ifnet *ifp, struct buf_ring *br) 699{ 700#ifdef ALTQ 701 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 702 return (ifp->if_snd.ifq_len); 703#endif 704 return (buf_ring_count(br)); 705} 706#endif 707/* 708 * 72 was chosen below because it is the size of a TCP/IP 709 * header (40) + the minimum mss (32). 710 */ 711#define IF_MINMTU 72 712#define IF_MAXMTU 65535 713 714#endif /* _KERNEL */ 715 716/* 717 * The ifaddr structure contains information about one address 718 * of an interface. They are maintained by the different address families, 719 * are allocated and attached when an address is set, and are linked 720 * together so all addresses for an interface can be located. 721 * 722 * NOTE: a 'struct ifaddr' is always at the beginning of a larger 723 * chunk of malloc'ed memory, where we store the three addresses 724 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here. 725 */ 726struct ifaddr { 727 struct sockaddr *ifa_addr; /* address of interface */ 728 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 729#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 730 struct sockaddr *ifa_netmask; /* used to determine subnet */ 731 struct if_data if_data; /* not all members are meaningful */ 732 struct ifnet *ifa_ifp; /* back-pointer to interface */ 733 struct carp_softc *ifa_carp; /* pointer to CARP data */ 734 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 735 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 736 (int, struct rtentry *, struct rt_addrinfo *); 737 u_short ifa_flags; /* mostly rt_flags for cloning */ 738 u_int ifa_refcnt; /* references to this structure */ 739 int ifa_metric; /* cost of going out this interface */ 740 int (*ifa_claim_addr) /* check if an addr goes to this if */ 741 (struct ifaddr *, struct sockaddr *); 742 struct mtx ifa_mtx; 743}; 744#define IFA_ROUTE RTF_UP /* route installed */ 745#define IFA_RTSELF RTF_HOST /* loopback route to self installed */ 746 747/* for compatibility with other BSDs */ 748#define ifa_list ifa_link 749 750#ifdef _KERNEL 751#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx) 752#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx) 753 754void ifa_free(struct ifaddr *ifa); 755void ifa_init(struct ifaddr *ifa); 756void ifa_ref(struct ifaddr *ifa); 757#endif 758 759/* 760 * The prefix structure contains information about one prefix 761 * of an interface. They are maintained by the different address families, 762 * are allocated and attached when a prefix or an address is set, 763 * and are linked together so all prefixes for an interface can be located. 764 */ 765struct ifprefix { 766 struct sockaddr *ifpr_prefix; /* prefix of interface */ 767 struct ifnet *ifpr_ifp; /* back-pointer to interface */ 768 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */ 769 u_char ifpr_plen; /* prefix length in bits */ 770 u_char ifpr_type; /* protocol dependent prefix type */ 771}; 772 773/* 774 * Multicast address structure. This is analogous to the ifaddr 775 * structure except that it keeps track of multicast addresses. 776 */ 777struct ifmultiaddr { 778 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 779 struct sockaddr *ifma_addr; /* address this membership is for */ 780 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 781 struct ifnet *ifma_ifp; /* back-pointer to interface */ 782 u_int ifma_refcount; /* reference count */ 783 void *ifma_protospec; /* protocol-specific state, if any */ 784 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */ 785}; 786 787#ifdef _KERNEL 788 789extern struct rwlock ifnet_rwlock; 790extern struct sx ifnet_sxlock; 791 792#define IFNET_LOCK_INIT() do { \ 793 rw_init_flags(&ifnet_rwlock, "ifnet_rw", RW_RECURSE); \ 794 sx_init_flags(&ifnet_sxlock, "ifnet_sx", SX_RECURSE); \ 795} while(0) 796 797#define IFNET_WLOCK() do { \ 798 sx_xlock(&ifnet_sxlock); \ 799 rw_wlock(&ifnet_rwlock); \ 800} while (0) 801 802#define IFNET_WUNLOCK() do { \ 803 rw_wunlock(&ifnet_rwlock); \ 804 sx_xunlock(&ifnet_sxlock); \ 805} while (0) 806 807/* 808 * To assert the ifnet lock, you must know not only whether it's for read or 809 * write, but also whether it was acquired with sleep support or not. 810 */ 811#define IFNET_RLOCK_ASSERT() sx_assert(&ifnet_sxlock, SA_SLOCKED) 812#define IFNET_RLOCK_NOSLEEP_ASSERT() rw_assert(&ifnet_rwlock, RA_RLOCKED) 813#define IFNET_WLOCK_ASSERT() do { \ 814 sx_assert(&ifnet_sxlock, SA_XLOCKED); \ 815 rw_assert(&ifnet_rwlock, RA_WLOCKED); \ 816} while (0) 817 818#define IFNET_RLOCK() sx_slock(&ifnet_sxlock) 819#define IFNET_RLOCK_NOSLEEP() rw_rlock(&ifnet_rwlock) 820#define IFNET_RUNLOCK() sx_sunlock(&ifnet_sxlock) 821#define IFNET_RUNLOCK_NOSLEEP() rw_runlock(&ifnet_rwlock) 822 823/* 824 * Look up an ifnet given its index; the _ref variant also acquires a 825 * reference that must be freed using if_rele(). It is almost always a bug 826 * to call ifnet_byindex() instead if ifnet_byindex_ref(). 827 */ 828struct ifnet *ifnet_byindex(u_short idx); 829struct ifnet *ifnet_byindex_locked(u_short idx); 830struct ifnet *ifnet_byindex_ref(u_short idx); 831 832/* 833 * Given the index, ifaddr_byindex() returns the one and only 834 * link-level ifaddr for the interface. You are not supposed to use 835 * it to traverse the list of addresses associated to the interface. 836 */ 837struct ifaddr *ifaddr_byindex(u_short idx); 838 839VNET_DECLARE(struct ifnethead, ifnet); 840VNET_DECLARE(struct ifgrouphead, ifg_head); 841VNET_DECLARE(int, if_index); 842VNET_DECLARE(struct ifnet *, loif); /* first loopback interface */ 843VNET_DECLARE(int, useloopback); 844 845#define V_ifnet VNET(ifnet) 846#define V_ifg_head VNET(ifg_head) 847#define V_if_index VNET(if_index) 848#define V_loif VNET(loif) 849#define V_useloopback VNET(useloopback) 850 851extern int ifqmaxlen; 852 853int if_addgroup(struct ifnet *, const char *); 854int if_delgroup(struct ifnet *, const char *); 855int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 856int if_allmulti(struct ifnet *, int); 857struct ifnet* if_alloc(u_char); 858void if_attach(struct ifnet *); 859void if_dead(struct ifnet *); 860int if_delmulti(struct ifnet *, struct sockaddr *); 861void if_delmulti_ifma(struct ifmultiaddr *); 862void if_detach(struct ifnet *); 863void if_vmove(struct ifnet *, struct vnet *); 864void if_purgeaddrs(struct ifnet *); 865void if_delallmulti(struct ifnet *); 866void if_down(struct ifnet *); 867struct ifmultiaddr * 868 if_findmulti(struct ifnet *, struct sockaddr *); 869void if_free(struct ifnet *); 870void if_initname(struct ifnet *, const char *, int); 871void if_link_state_change(struct ifnet *, int); 872int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 873void if_qflush(struct ifnet *); 874void if_ref(struct ifnet *); 875void if_rele(struct ifnet *); 876int if_setlladdr(struct ifnet *, const u_char *, int); 877void if_up(struct ifnet *); 878int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 879int ifpromisc(struct ifnet *, int); 880struct ifnet *ifunit(const char *); 881struct ifnet *ifunit_ref(const char *); 882 883void ifq_init(struct ifaltq *, struct ifnet *ifp); 884void ifq_delete(struct ifaltq *); 885 886int ifa_add_loopback_route(struct ifaddr *, struct sockaddr *); 887int ifa_del_loopback_route(struct ifaddr *, struct sockaddr *); 888 889struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 890int ifa_ifwithaddr_check(struct sockaddr *); 891struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *); 892struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 893struct ifaddr *ifa_ifwithnet(struct sockaddr *, int); 894struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 895struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int); 896 897struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 898 899int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 900 901typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp); 902typedef void if_com_free_t(void *com, u_char type); 903void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f); 904void if_deregister_com_alloc(u_char type); 905 906#define IF_LLADDR(ifp) \ 907 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr)) 908 909#ifdef DEVICE_POLLING 910enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS }; 911 912typedef int poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 913int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 914int ether_poll_deregister(struct ifnet *ifp); 915#endif /* DEVICE_POLLING */ 916 917#endif /* _KERNEL */ 918 919#endif /* !_NET_IF_VAR_H_ */ 920