ifq.h revision 240112
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 240112 2012-09-04 22:17:33Z melifaro $ 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(ifmultihead, ifmultiaddr); 100TAILQ_HEAD(ifgrouphead, ifg_group); 101 102#ifdef _KERNEL 103VNET_DECLARE(struct pfil_head, link_pfil_hook); /* packet filter hooks */ 104#define V_link_pfil_hook VNET(link_pfil_hook) 105#endif /* _KERNEL */ 106 107/* 108 * Structure defining a queue for a network interface. 109 */ 110struct ifqueue { 111 struct mbuf *ifq_head; 112 struct mbuf *ifq_tail; 113 int ifq_len; 114 int ifq_maxlen; 115 int ifq_drops; 116 struct mtx ifq_mtx; 117}; 118 119/* 120 * Structure defining a network interface. 121 * 122 * (Would like to call this struct ``if'', but C isn't PL/1.) 123 */ 124 125struct ifnet { 126 void *if_softc; /* pointer to driver state */ 127 void *if_l2com; /* pointer to protocol bits */ 128 struct vnet *if_vnet; /* pointer to network stack instance */ 129 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */ 130 char if_xname[IFNAMSIZ]; /* external name (name + unit) */ 131 const char *if_dname; /* driver name */ 132 int if_dunit; /* unit or IF_DUNIT_NONE */ 133 u_int if_refcount; /* reference count */ 134 struct ifaddrhead if_addrhead; /* linked list of addresses per if */ 135 /* 136 * if_addrhead is the list of all addresses associated to 137 * an interface. 138 * Some code in the kernel assumes that first element 139 * of the list has type AF_LINK, and contains sockaddr_dl 140 * addresses which store the link-level address and the name 141 * of the interface. 142 * However, access to the AF_LINK address through this 143 * field is deprecated. Use if_addr or ifaddr_byindex() instead. 144 */ 145 int if_pcount; /* number of promiscuous listeners */ 146 struct carp_if *if_carp; /* carp interface structure */ 147 struct bpf_if *if_bpf; /* packet filter structure */ 148 u_short if_index; /* numeric abbreviation for this if */ 149 short if_index_reserved; /* spare space to grow if_index */ 150 struct ifvlantrunk *if_vlantrunk; /* pointer to 802.1q data */ 151 int if_flags; /* up/down, broadcast, etc. */ 152 int if_capabilities; /* interface features & capabilities */ 153 int if_capenable; /* enabled features & capabilities */ 154 void *if_linkmib; /* link-type-specific MIB data */ 155 size_t if_linkmiblen; /* length of above data */ 156 struct if_data if_data; 157 struct ifmultihead if_multiaddrs; /* multicast addresses configured */ 158 int if_amcount; /* number of all-multicast requests */ 159/* procedure handles */ 160 int (*if_output) /* output routine (enqueue) */ 161 (struct ifnet *, struct mbuf *, struct sockaddr *, 162 struct route *); 163 void (*if_input) /* input routine (from h/w driver) */ 164 (struct ifnet *, struct mbuf *); 165 void (*if_start) /* initiate output routine */ 166 (struct ifnet *); 167 int (*if_ioctl) /* ioctl routine */ 168 (struct ifnet *, u_long, caddr_t); 169 void (*if_init) /* Init routine */ 170 (void *); 171 int (*if_resolvemulti) /* validate/resolve multicast */ 172 (struct ifnet *, struct sockaddr **, struct sockaddr *); 173 void (*if_qflush) /* flush any queues */ 174 (struct ifnet *); 175 int (*if_transmit) /* initiate output routine */ 176 (struct ifnet *, struct mbuf *); 177 void (*if_reassign) /* reassign to vnet routine */ 178 (struct ifnet *, struct vnet *, char *); 179 struct vnet *if_home_vnet; /* where this ifnet originates from */ 180 struct ifaddr *if_addr; /* pointer to link-level address */ 181 void *if_llsoftc; /* link layer softc */ 182 int if_drv_flags; /* driver-managed status flags */ 183 struct ifaltq if_snd; /* output queue (includes altq) */ 184 const u_int8_t *if_broadcastaddr; /* linklevel broadcast bytestring */ 185 186 void *if_bridge; /* bridge glue */ 187 188 struct label *if_label; /* interface MAC label */ 189 190 /* these are only used by IPv6 */ 191 void *if_unused[2]; 192 void *if_afdata[AF_MAX]; 193 int if_afdata_initialized; 194 struct rwlock if_afdata_lock; 195 struct task if_linktask; /* task for link change events */ 196 struct rwlock if_addr_lock; /* lock to protect address lists */ 197 198 LIST_ENTRY(ifnet) if_clones; /* interfaces of a cloner */ 199 TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */ 200 /* protected by if_addr_lock */ 201 void *if_pf_kif; 202 void *if_lagg; /* lagg glue */ 203 char *if_description; /* interface description */ 204 u_int if_fib; /* interface FIB */ 205 u_char if_alloctype; /* if_type at time of allocation */ 206 207 /* 208 * Spare fields are added so that we can modify sensitive data 209 * structures without changing the kernel binary interface, and must 210 * be used with care where binary compatibility is required. 211 */ 212 char if_cspare[3]; 213 int if_ispare[4]; 214 void *if_pspare[8]; /* 1 netmap, 7 TDB */ 215}; 216 217typedef void if_init_f_t(void *); 218 219/* 220 * XXX These aliases are terribly dangerous because they could apply 221 * to anything. 222 */ 223#define if_mtu if_data.ifi_mtu 224#define if_type if_data.ifi_type 225#define if_physical if_data.ifi_physical 226#define if_addrlen if_data.ifi_addrlen 227#define if_hdrlen if_data.ifi_hdrlen 228#define if_metric if_data.ifi_metric 229#define if_link_state if_data.ifi_link_state 230#define if_baudrate if_data.ifi_baudrate 231#define if_hwassist if_data.ifi_hwassist 232#define if_ipackets if_data.ifi_ipackets 233#define if_ierrors if_data.ifi_ierrors 234#define if_opackets if_data.ifi_opackets 235#define if_oerrors if_data.ifi_oerrors 236#define if_collisions if_data.ifi_collisions 237#define if_ibytes if_data.ifi_ibytes 238#define if_obytes if_data.ifi_obytes 239#define if_imcasts if_data.ifi_imcasts 240#define if_omcasts if_data.ifi_omcasts 241#define if_iqdrops if_data.ifi_iqdrops 242#define if_noproto if_data.ifi_noproto 243#define if_lastchange if_data.ifi_lastchange 244 245/* for compatibility with other BSDs */ 246#define if_addrlist if_addrhead 247#define if_list if_link 248#define if_name(ifp) ((ifp)->if_xname) 249 250/* 251 * Locks for address lists on the network interface. 252 */ 253#define IF_ADDR_LOCK_INIT(if) rw_init(&(if)->if_addr_lock, "if_addr_lock") 254#define IF_ADDR_LOCK_DESTROY(if) rw_destroy(&(if)->if_addr_lock) 255#define IF_ADDR_WLOCK(if) rw_wlock(&(if)->if_addr_lock) 256#define IF_ADDR_WUNLOCK(if) rw_wunlock(&(if)->if_addr_lock) 257#define IF_ADDR_RLOCK(if) rw_rlock(&(if)->if_addr_lock) 258#define IF_ADDR_RUNLOCK(if) rw_runlock(&(if)->if_addr_lock) 259#define IF_ADDR_LOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_LOCKED) 260#define IF_ADDR_WLOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_WLOCKED) 261 262/* 263 * Function variations on locking macros intended to be used by loadable 264 * kernel modules in order to divorce them from the internals of address list 265 * locking. 266 */ 267void if_addr_rlock(struct ifnet *ifp); /* if_addrhead */ 268void if_addr_runlock(struct ifnet *ifp); /* if_addrhead */ 269void if_maddr_rlock(struct ifnet *ifp); /* if_multiaddrs */ 270void if_maddr_runlock(struct ifnet *ifp); /* if_multiaddrs */ 271 272/* 273 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 274 * are queues of messages stored on ifqueue structures 275 * (defined above). Entries are added to and deleted from these structures 276 * by these macros, which should be called with ipl raised to splimp(). 277 */ 278#define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 279#define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 280#define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 281#define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 282#define _IF_DROP(ifq) ((ifq)->ifq_drops++) 283#define _IF_QLEN(ifq) ((ifq)->ifq_len) 284 285#define _IF_ENQUEUE(ifq, m) do { \ 286 (m)->m_nextpkt = NULL; \ 287 if ((ifq)->ifq_tail == NULL) \ 288 (ifq)->ifq_head = m; \ 289 else \ 290 (ifq)->ifq_tail->m_nextpkt = m; \ 291 (ifq)->ifq_tail = m; \ 292 (ifq)->ifq_len++; \ 293} while (0) 294 295#define IF_ENQUEUE(ifq, m) do { \ 296 IF_LOCK(ifq); \ 297 _IF_ENQUEUE(ifq, m); \ 298 IF_UNLOCK(ifq); \ 299} while (0) 300 301#define _IF_PREPEND(ifq, m) do { \ 302 (m)->m_nextpkt = (ifq)->ifq_head; \ 303 if ((ifq)->ifq_tail == NULL) \ 304 (ifq)->ifq_tail = (m); \ 305 (ifq)->ifq_head = (m); \ 306 (ifq)->ifq_len++; \ 307} while (0) 308 309#define IF_PREPEND(ifq, m) do { \ 310 IF_LOCK(ifq); \ 311 _IF_PREPEND(ifq, m); \ 312 IF_UNLOCK(ifq); \ 313} while (0) 314 315#define _IF_DEQUEUE(ifq, m) do { \ 316 (m) = (ifq)->ifq_head; \ 317 if (m) { \ 318 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \ 319 (ifq)->ifq_tail = NULL; \ 320 (m)->m_nextpkt = NULL; \ 321 (ifq)->ifq_len--; \ 322 } \ 323} while (0) 324 325#define IF_DEQUEUE(ifq, m) do { \ 326 IF_LOCK(ifq); \ 327 _IF_DEQUEUE(ifq, m); \ 328 IF_UNLOCK(ifq); \ 329} while (0) 330 331#define _IF_DEQUEUE_ALL(ifq, m) do { \ 332 (m) = (ifq)->ifq_head; \ 333 (ifq)->ifq_head = (ifq)->ifq_tail = NULL; \ 334 (ifq)->ifq_len = 0; \ 335} while (0) 336 337#define IF_DEQUEUE_ALL(ifq, m) do { \ 338 IF_LOCK(ifq); \ 339 _IF_DEQUEUE_ALL(ifq, m); \ 340 IF_UNLOCK(ifq); \ 341} while (0) 342 343#define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 344#define IF_POLL(ifq, m) _IF_POLL(ifq, m) 345 346#define _IF_DRAIN(ifq) do { \ 347 struct mbuf *m; \ 348 for (;;) { \ 349 _IF_DEQUEUE(ifq, m); \ 350 if (m == NULL) \ 351 break; \ 352 m_freem(m); \ 353 } \ 354} while (0) 355 356#define IF_DRAIN(ifq) do { \ 357 IF_LOCK(ifq); \ 358 _IF_DRAIN(ifq); \ 359 IF_UNLOCK(ifq); \ 360} while(0) 361 362#ifdef _KERNEL 363/* interface link layer address change event */ 364typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *); 365EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t); 366/* interface address change event */ 367typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 368EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 369/* new interface arrival event */ 370typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 371EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 372/* interface departure event */ 373typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 374EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 375/* Interface link state change event */ 376typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int); 377EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t); 378 379/* 380 * interface groups 381 */ 382struct ifg_group { 383 char ifg_group[IFNAMSIZ]; 384 u_int ifg_refcnt; 385 void *ifg_pf_kif; 386 TAILQ_HEAD(, ifg_member) ifg_members; 387 TAILQ_ENTRY(ifg_group) ifg_next; 388}; 389 390struct ifg_member { 391 TAILQ_ENTRY(ifg_member) ifgm_next; 392 struct ifnet *ifgm_ifp; 393}; 394 395struct ifg_list { 396 struct ifg_group *ifgl_group; 397 TAILQ_ENTRY(ifg_list) ifgl_next; 398}; 399 400/* group attach event */ 401typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *); 402EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t); 403/* group detach event */ 404typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *); 405EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t); 406/* group change event */ 407typedef void (*group_change_event_handler_t)(void *, const char *); 408EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t); 409 410#define IF_AFDATA_LOCK_INIT(ifp) \ 411 rw_init(&(ifp)->if_afdata_lock, "if_afdata") 412 413#define IF_AFDATA_WLOCK(ifp) rw_wlock(&(ifp)->if_afdata_lock) 414#define IF_AFDATA_RLOCK(ifp) rw_rlock(&(ifp)->if_afdata_lock) 415#define IF_AFDATA_WUNLOCK(ifp) rw_wunlock(&(ifp)->if_afdata_lock) 416#define IF_AFDATA_RUNLOCK(ifp) rw_runlock(&(ifp)->if_afdata_lock) 417#define IF_AFDATA_LOCK(ifp) IF_AFDATA_WLOCK(ifp) 418#define IF_AFDATA_UNLOCK(ifp) IF_AFDATA_WUNLOCK(ifp) 419#define IF_AFDATA_TRYLOCK(ifp) rw_try_wlock(&(ifp)->if_afdata_lock) 420#define IF_AFDATA_DESTROY(ifp) rw_destroy(&(ifp)->if_afdata_lock) 421 422#define IF_AFDATA_LOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED) 423#define IF_AFDATA_RLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_RLOCKED) 424#define IF_AFDATA_WLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_WLOCKED) 425#define IF_AFDATA_UNLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED) 426 427int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, 428 int adjust); 429#define IF_HANDOFF(ifq, m, ifp) \ 430 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 431#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 432 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 433 434void if_start(struct ifnet *); 435 436#define IFQ_ENQUEUE(ifq, m, err) \ 437do { \ 438 IF_LOCK(ifq); \ 439 if (ALTQ_IS_ENABLED(ifq)) \ 440 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 441 else { \ 442 if (_IF_QFULL(ifq)) { \ 443 m_freem(m); \ 444 (err) = ENOBUFS; \ 445 } else { \ 446 _IF_ENQUEUE(ifq, m); \ 447 (err) = 0; \ 448 } \ 449 } \ 450 if (err) \ 451 (ifq)->ifq_drops++; \ 452 IF_UNLOCK(ifq); \ 453} while (0) 454 455#define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 456do { \ 457 if (TBR_IS_ENABLED(ifq)) \ 458 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 459 else if (ALTQ_IS_ENABLED(ifq)) \ 460 ALTQ_DEQUEUE(ifq, m); \ 461 else \ 462 _IF_DEQUEUE(ifq, m); \ 463} while (0) 464 465#define IFQ_DEQUEUE(ifq, m) \ 466do { \ 467 IF_LOCK(ifq); \ 468 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 469 IF_UNLOCK(ifq); \ 470} while (0) 471 472#define IFQ_POLL_NOLOCK(ifq, m) \ 473do { \ 474 if (TBR_IS_ENABLED(ifq)) \ 475 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 476 else if (ALTQ_IS_ENABLED(ifq)) \ 477 ALTQ_POLL(ifq, m); \ 478 else \ 479 _IF_POLL(ifq, m); \ 480} while (0) 481 482#define IFQ_POLL(ifq, m) \ 483do { \ 484 IF_LOCK(ifq); \ 485 IFQ_POLL_NOLOCK(ifq, m); \ 486 IF_UNLOCK(ifq); \ 487} while (0) 488 489#define IFQ_PURGE_NOLOCK(ifq) \ 490do { \ 491 if (ALTQ_IS_ENABLED(ifq)) { \ 492 ALTQ_PURGE(ifq); \ 493 } else \ 494 _IF_DRAIN(ifq); \ 495} while (0) 496 497#define IFQ_PURGE(ifq) \ 498do { \ 499 IF_LOCK(ifq); \ 500 IFQ_PURGE_NOLOCK(ifq); \ 501 IF_UNLOCK(ifq); \ 502} while (0) 503 504#define IFQ_SET_READY(ifq) \ 505 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 506 507#define IFQ_LOCK(ifq) IF_LOCK(ifq) 508#define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq) 509#define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq) 510#define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0) 511#define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++) 512#define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len) 513#define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++) 514#define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len)) 515 516/* 517 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in 518 * the handoff logic, as that flag is locked by the device driver. 519 */ 520#define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \ 521do { \ 522 int len; \ 523 short mflags; \ 524 \ 525 len = (m)->m_pkthdr.len; \ 526 mflags = (m)->m_flags; \ 527 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \ 528 if ((err) == 0) { \ 529 (ifp)->if_obytes += len + (adj); \ 530 if (mflags & M_MCAST) \ 531 (ifp)->if_omcasts++; \ 532 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \ 533 if_start(ifp); \ 534 } \ 535} while (0) 536 537#define IFQ_HANDOFF(ifp, m, err) \ 538 IFQ_HANDOFF_ADJ(ifp, m, 0, err) 539 540#define IFQ_DRV_DEQUEUE(ifq, m) \ 541do { \ 542 (m) = (ifq)->ifq_drv_head; \ 543 if (m) { \ 544 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \ 545 (ifq)->ifq_drv_tail = NULL; \ 546 (m)->m_nextpkt = NULL; \ 547 (ifq)->ifq_drv_len--; \ 548 } else { \ 549 IFQ_LOCK(ifq); \ 550 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 551 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \ 552 struct mbuf *m0; \ 553 IFQ_DEQUEUE_NOLOCK(ifq, m0); \ 554 if (m0 == NULL) \ 555 break; \ 556 m0->m_nextpkt = NULL; \ 557 if ((ifq)->ifq_drv_tail == NULL) \ 558 (ifq)->ifq_drv_head = m0; \ 559 else \ 560 (ifq)->ifq_drv_tail->m_nextpkt = m0; \ 561 (ifq)->ifq_drv_tail = m0; \ 562 (ifq)->ifq_drv_len++; \ 563 } \ 564 IFQ_UNLOCK(ifq); \ 565 } \ 566} while (0) 567 568#define IFQ_DRV_PREPEND(ifq, m) \ 569do { \ 570 (m)->m_nextpkt = (ifq)->ifq_drv_head; \ 571 if ((ifq)->ifq_drv_tail == NULL) \ 572 (ifq)->ifq_drv_tail = (m); \ 573 (ifq)->ifq_drv_head = (m); \ 574 (ifq)->ifq_drv_len++; \ 575} while (0) 576 577#define IFQ_DRV_IS_EMPTY(ifq) \ 578 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0)) 579 580#define IFQ_DRV_PURGE(ifq) \ 581do { \ 582 struct mbuf *m, *n = (ifq)->ifq_drv_head; \ 583 while((m = n) != NULL) { \ 584 n = m->m_nextpkt; \ 585 m_freem(m); \ 586 } \ 587 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \ 588 (ifq)->ifq_drv_len = 0; \ 589 IFQ_PURGE(ifq); \ 590} while (0) 591 592#ifdef _KERNEL 593static __inline void 594drbr_stats_update(struct ifnet *ifp, int len, int mflags) 595{ 596#ifndef NO_SLOW_STATS 597 ifp->if_obytes += len; 598 if (mflags & M_MCAST) 599 ifp->if_omcasts++; 600#endif 601} 602 603static __inline int 604drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m) 605{ 606 int error = 0; 607 int len = m->m_pkthdr.len; 608 int mflags = m->m_flags; 609 610#ifdef ALTQ 611 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 612 IFQ_ENQUEUE(&ifp->if_snd, m, error); 613 return (error); 614 } 615#endif 616 if ((error = buf_ring_enqueue_bytes(br, m, len)) == ENOBUFS) { 617 br->br_drops++; 618 m_freem(m); 619 } else 620 drbr_stats_update(ifp, len, mflags); 621 622 return (error); 623} 624 625static __inline void 626drbr_flush(struct ifnet *ifp, struct buf_ring *br) 627{ 628 struct mbuf *m; 629 630#ifdef ALTQ 631 if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) 632 IFQ_PURGE(&ifp->if_snd); 633#endif 634 while ((m = buf_ring_dequeue_sc(br)) != NULL) 635 m_freem(m); 636} 637 638static __inline void 639drbr_free(struct buf_ring *br, struct malloc_type *type) 640{ 641 642 drbr_flush(NULL, br); 643 buf_ring_free(br, type); 644} 645 646static __inline struct mbuf * 647drbr_dequeue(struct ifnet *ifp, struct buf_ring *br) 648{ 649#ifdef ALTQ 650 struct mbuf *m; 651 652 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 653 IFQ_DEQUEUE(&ifp->if_snd, m); 654 return (m); 655 } 656#endif 657 return (buf_ring_dequeue_sc(br)); 658} 659 660static __inline struct mbuf * 661drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br, 662 int (*func) (struct mbuf *, void *), void *arg) 663{ 664 struct mbuf *m; 665#ifdef ALTQ 666 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 667 IFQ_LOCK(&ifp->if_snd); 668 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 669 if (m != NULL && func(m, arg) == 0) { 670 IFQ_UNLOCK(&ifp->if_snd); 671 return (NULL); 672 } 673 IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m); 674 IFQ_UNLOCK(&ifp->if_snd); 675 return (m); 676 } 677#endif 678 m = buf_ring_peek(br); 679 if (m == NULL || func(m, arg) == 0) 680 return (NULL); 681 682 return (buf_ring_dequeue_sc(br)); 683} 684 685static __inline int 686drbr_empty(struct ifnet *ifp, struct buf_ring *br) 687{ 688#ifdef ALTQ 689 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 690 return (IFQ_IS_EMPTY(&ifp->if_snd)); 691#endif 692 return (buf_ring_empty(br)); 693} 694 695static __inline int 696drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br) 697{ 698#ifdef ALTQ 699 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 700 return (1); 701#endif 702 return (!buf_ring_empty(br)); 703} 704 705static __inline int 706drbr_inuse(struct ifnet *ifp, struct buf_ring *br) 707{ 708#ifdef ALTQ 709 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 710 return (ifp->if_snd.ifq_len); 711#endif 712 return (buf_ring_count(br)); 713} 714#endif 715/* 716 * 72 was chosen below because it is the size of a TCP/IP 717 * header (40) + the minimum mss (32). 718 */ 719#define IF_MINMTU 72 720#define IF_MAXMTU 65535 721 722#define TOEDEV(ifp) ((ifp)->if_llsoftc) 723 724#endif /* _KERNEL */ 725 726/* 727 * The ifaddr structure contains information about one address 728 * of an interface. They are maintained by the different address families, 729 * are allocated and attached when an address is set, and are linked 730 * together so all addresses for an interface can be located. 731 * 732 * NOTE: a 'struct ifaddr' is always at the beginning of a larger 733 * chunk of malloc'ed memory, where we store the three addresses 734 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here. 735 */ 736struct ifaddr { 737 struct sockaddr *ifa_addr; /* address of interface */ 738 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 739#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 740 struct sockaddr *ifa_netmask; /* used to determine subnet */ 741 struct if_data if_data; /* not all members are meaningful */ 742 struct ifnet *ifa_ifp; /* back-pointer to interface */ 743 struct carp_softc *ifa_carp; /* pointer to CARP data */ 744 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 745 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 746 (int, struct rtentry *, struct rt_addrinfo *); 747 u_short ifa_flags; /* mostly rt_flags for cloning */ 748 u_int ifa_refcnt; /* references to this structure */ 749 int ifa_metric; /* cost of going out this interface */ 750 int (*ifa_claim_addr) /* check if an addr goes to this if */ 751 (struct ifaddr *, struct sockaddr *); 752 struct mtx ifa_mtx; 753}; 754#define IFA_ROUTE RTF_UP /* route installed */ 755#define IFA_RTSELF RTF_HOST /* loopback route to self installed */ 756 757/* for compatibility with other BSDs */ 758#define ifa_list ifa_link 759 760#ifdef _KERNEL 761#define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx) 762#define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx) 763 764void ifa_free(struct ifaddr *ifa); 765void ifa_init(struct ifaddr *ifa); 766void ifa_ref(struct ifaddr *ifa); 767#endif 768 769/* 770 * Multicast address structure. This is analogous to the ifaddr 771 * structure except that it keeps track of multicast addresses. 772 */ 773struct ifmultiaddr { 774 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 775 struct sockaddr *ifma_addr; /* address this membership is for */ 776 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 777 struct ifnet *ifma_ifp; /* back-pointer to interface */ 778 u_int ifma_refcount; /* reference count */ 779 void *ifma_protospec; /* protocol-specific state, if any */ 780 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */ 781}; 782 783#ifdef _KERNEL 784 785extern struct rwlock ifnet_rwlock; 786extern struct sx ifnet_sxlock; 787 788#define IFNET_LOCK_INIT() do { \ 789 rw_init_flags(&ifnet_rwlock, "ifnet_rw", RW_RECURSE); \ 790 sx_init_flags(&ifnet_sxlock, "ifnet_sx", SX_RECURSE); \ 791} while(0) 792 793#define IFNET_WLOCK() do { \ 794 sx_xlock(&ifnet_sxlock); \ 795 rw_wlock(&ifnet_rwlock); \ 796} while (0) 797 798#define IFNET_WUNLOCK() do { \ 799 rw_wunlock(&ifnet_rwlock); \ 800 sx_xunlock(&ifnet_sxlock); \ 801} while (0) 802 803/* 804 * To assert the ifnet lock, you must know not only whether it's for read or 805 * write, but also whether it was acquired with sleep support or not. 806 */ 807#define IFNET_RLOCK_ASSERT() sx_assert(&ifnet_sxlock, SA_SLOCKED) 808#define IFNET_RLOCK_NOSLEEP_ASSERT() rw_assert(&ifnet_rwlock, RA_RLOCKED) 809#define IFNET_WLOCK_ASSERT() do { \ 810 sx_assert(&ifnet_sxlock, SA_XLOCKED); \ 811 rw_assert(&ifnet_rwlock, RA_WLOCKED); \ 812} while (0) 813 814#define IFNET_RLOCK() sx_slock(&ifnet_sxlock) 815#define IFNET_RLOCK_NOSLEEP() rw_rlock(&ifnet_rwlock) 816#define IFNET_RUNLOCK() sx_sunlock(&ifnet_sxlock) 817#define IFNET_RUNLOCK_NOSLEEP() rw_runlock(&ifnet_rwlock) 818 819/* 820 * Look up an ifnet given its index; the _ref variant also acquires a 821 * reference that must be freed using if_rele(). It is almost always a bug 822 * to call ifnet_byindex() instead if ifnet_byindex_ref(). 823 */ 824struct ifnet *ifnet_byindex(u_short idx); 825struct ifnet *ifnet_byindex_locked(u_short idx); 826struct ifnet *ifnet_byindex_ref(u_short idx); 827 828/* 829 * Given the index, ifaddr_byindex() returns the one and only 830 * link-level ifaddr for the interface. You are not supposed to use 831 * it to traverse the list of addresses associated to the interface. 832 */ 833struct ifaddr *ifaddr_byindex(u_short idx); 834 835VNET_DECLARE(struct ifnethead, ifnet); 836VNET_DECLARE(struct ifgrouphead, ifg_head); 837VNET_DECLARE(int, if_index); 838VNET_DECLARE(struct ifnet *, loif); /* first loopback interface */ 839VNET_DECLARE(int, useloopback); 840 841#define V_ifnet VNET(ifnet) 842#define V_ifg_head VNET(ifg_head) 843#define V_if_index VNET(if_index) 844#define V_loif VNET(loif) 845#define V_useloopback VNET(useloopback) 846 847extern int ifqmaxlen; 848 849int if_addgroup(struct ifnet *, const char *); 850int if_delgroup(struct ifnet *, const char *); 851int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 852int if_allmulti(struct ifnet *, int); 853struct ifnet* if_alloc(u_char); 854void if_attach(struct ifnet *); 855void if_dead(struct ifnet *); 856int if_delmulti(struct ifnet *, struct sockaddr *); 857void if_delmulti_ifma(struct ifmultiaddr *); 858void if_detach(struct ifnet *); 859void if_vmove(struct ifnet *, struct vnet *); 860void if_purgeaddrs(struct ifnet *); 861void if_delallmulti(struct ifnet *); 862void if_down(struct ifnet *); 863struct ifmultiaddr * 864 if_findmulti(struct ifnet *, struct sockaddr *); 865void if_free(struct ifnet *); 866void if_initname(struct ifnet *, const char *, int); 867void if_link_state_change(struct ifnet *, int); 868int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 869void if_qflush(struct ifnet *); 870void if_ref(struct ifnet *); 871void if_rele(struct ifnet *); 872int if_setlladdr(struct ifnet *, const u_char *, int); 873void if_up(struct ifnet *); 874int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 875int ifpromisc(struct ifnet *, int); 876struct ifnet *ifunit(const char *); 877struct ifnet *ifunit_ref(const char *); 878 879void ifq_init(struct ifaltq *, struct ifnet *ifp); 880void ifq_delete(struct ifaltq *); 881 882int ifa_add_loopback_route(struct ifaddr *, struct sockaddr *); 883int ifa_del_loopback_route(struct ifaddr *, struct sockaddr *); 884 885struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 886int ifa_ifwithaddr_check(struct sockaddr *); 887struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *); 888struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 889struct ifaddr *ifa_ifwithnet(struct sockaddr *, int); 890struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 891struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int); 892 893struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 894 895int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 896 897typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp); 898typedef void if_com_free_t(void *com, u_char type); 899void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f); 900void if_deregister_com_alloc(u_char type); 901 902#define IF_LLADDR(ifp) \ 903 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr)) 904 905#ifdef DEVICE_POLLING 906enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS }; 907 908typedef int poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 909int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 910int ether_poll_deregister(struct ifnet *ifp); 911#endif /* DEVICE_POLLING */ 912 913#endif /* _KERNEL */ 914 915#endif /* !_NET_IF_VAR_H_ */ 916