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FreeBSD/Linux Kernel Cross Reference
sys/net/if_var.h
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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: releng/10.1/sys/net/if_var.h 267186 2014-06-06 20:35:40Z asomers $ 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 */ 65 struct mbuf; 66 struct thread; 67 struct rtentry; 68 struct rt_addrinfo; 69 struct socket; 70 struct ether_header; 71 struct carp_if; 72 struct carp_softc; 73 struct ifvlantrunk; 74 struct route; 75 struct 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 97 TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */ 98 TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */ 99 TAILQ_HEAD(ifmultihead, ifmultiaddr); 100 TAILQ_HEAD(ifgrouphead, ifg_group); 101 102 #ifdef _KERNEL 103 VNET_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 */ 110 struct 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 */ 124 125 struct 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 *, const 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 u_int if_hw_tsomax; /* tso burst length limit, the minimum 208 * is (IP_MAXPACKET / 8). 209 * XXXAO: Have to find a better place 210 * for it eventually. */ 211 212 /* 213 * Spare fields are added so that we can modify sensitive data 214 * structures without changing the kernel binary interface, and must 215 * be used with care where binary compatibility is required. 216 */ 217 char if_cspare[3]; 218 int if_ispare[4]; 219 void *if_pspare[8]; /* 1 netmap, 7 TDB */ 220 }; 221 222 typedef void if_init_f_t(void *); 223 224 /* 225 * XXX These aliases are terribly dangerous because they could apply 226 * to anything. 227 */ 228 #define if_mtu if_data.ifi_mtu 229 #define if_type if_data.ifi_type 230 #define if_physical if_data.ifi_physical 231 #define if_addrlen if_data.ifi_addrlen 232 #define if_hdrlen if_data.ifi_hdrlen 233 #define if_metric if_data.ifi_metric 234 #define if_link_state if_data.ifi_link_state 235 #define if_baudrate if_data.ifi_baudrate 236 #define if_baudrate_pf if_data.ifi_baudrate_pf 237 #define if_hwassist if_data.ifi_hwassist 238 #define if_ipackets if_data.ifi_ipackets 239 #define if_ierrors if_data.ifi_ierrors 240 #define if_opackets if_data.ifi_opackets 241 #define if_oerrors if_data.ifi_oerrors 242 #define if_collisions if_data.ifi_collisions 243 #define if_ibytes if_data.ifi_ibytes 244 #define if_obytes if_data.ifi_obytes 245 #define if_imcasts if_data.ifi_imcasts 246 #define if_omcasts if_data.ifi_omcasts 247 #define if_iqdrops if_data.ifi_iqdrops 248 #define if_noproto if_data.ifi_noproto 249 #define if_lastchange if_data.ifi_lastchange 250 251 /* for compatibility with other BSDs */ 252 #define if_addrlist if_addrhead 253 #define if_list if_link 254 #define if_name(ifp) ((ifp)->if_xname) 255 256 /* 257 * Locks for address lists on the network interface. 258 */ 259 #define IF_ADDR_LOCK_INIT(if) rw_init(&(if)->if_addr_lock, "if_addr_lock") 260 #define IF_ADDR_LOCK_DESTROY(if) rw_destroy(&(if)->if_addr_lock) 261 #define IF_ADDR_WLOCK(if) rw_wlock(&(if)->if_addr_lock) 262 #define IF_ADDR_WUNLOCK(if) rw_wunlock(&(if)->if_addr_lock) 263 #define IF_ADDR_RLOCK(if) rw_rlock(&(if)->if_addr_lock) 264 #define IF_ADDR_RUNLOCK(if) rw_runlock(&(if)->if_addr_lock) 265 #define IF_ADDR_LOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_LOCKED) 266 #define IF_ADDR_WLOCK_ASSERT(if) rw_assert(&(if)->if_addr_lock, RA_WLOCKED) 267 268 /* 269 * Function variations on locking macros intended to be used by loadable 270 * kernel modules in order to divorce them from the internals of address list 271 * locking. 272 */ 273 void if_addr_rlock(struct ifnet *ifp); /* if_addrhead */ 274 void if_addr_runlock(struct ifnet *ifp); /* if_addrhead */ 275 void if_maddr_rlock(struct ifnet *ifp); /* if_multiaddrs */ 276 void if_maddr_runlock(struct ifnet *ifp); /* if_multiaddrs */ 277 278 /* 279 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq) 280 * are queues of messages stored on ifqueue structures 281 * (defined above). Entries are added to and deleted from these structures 282 * by these macros. 283 */ 284 #define IF_LOCK(ifq) mtx_lock(&(ifq)->ifq_mtx) 285 #define IF_UNLOCK(ifq) mtx_unlock(&(ifq)->ifq_mtx) 286 #define IF_LOCK_ASSERT(ifq) mtx_assert(&(ifq)->ifq_mtx, MA_OWNED) 287 #define _IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen) 288 #define _IF_DROP(ifq) ((ifq)->ifq_drops++) 289 #define _IF_QLEN(ifq) ((ifq)->ifq_len) 290 291 #define _IF_ENQUEUE(ifq, m) do { \ 292 (m)->m_nextpkt = NULL; \ 293 if ((ifq)->ifq_tail == NULL) \ 294 (ifq)->ifq_head = m; \ 295 else \ 296 (ifq)->ifq_tail->m_nextpkt = m; \ 297 (ifq)->ifq_tail = m; \ 298 (ifq)->ifq_len++; \ 299 } while (0) 300 301 #define IF_ENQUEUE(ifq, m) do { \ 302 IF_LOCK(ifq); \ 303 _IF_ENQUEUE(ifq, m); \ 304 IF_UNLOCK(ifq); \ 305 } while (0) 306 307 #define _IF_PREPEND(ifq, m) do { \ 308 (m)->m_nextpkt = (ifq)->ifq_head; \ 309 if ((ifq)->ifq_tail == NULL) \ 310 (ifq)->ifq_tail = (m); \ 311 (ifq)->ifq_head = (m); \ 312 (ifq)->ifq_len++; \ 313 } while (0) 314 315 #define IF_PREPEND(ifq, m) do { \ 316 IF_LOCK(ifq); \ 317 _IF_PREPEND(ifq, m); \ 318 IF_UNLOCK(ifq); \ 319 } while (0) 320 321 #define _IF_DEQUEUE(ifq, m) do { \ 322 (m) = (ifq)->ifq_head; \ 323 if (m) { \ 324 if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \ 325 (ifq)->ifq_tail = NULL; \ 326 (m)->m_nextpkt = NULL; \ 327 (ifq)->ifq_len--; \ 328 } \ 329 } while (0) 330 331 #define IF_DEQUEUE(ifq, m) do { \ 332 IF_LOCK(ifq); \ 333 _IF_DEQUEUE(ifq, m); \ 334 IF_UNLOCK(ifq); \ 335 } while (0) 336 337 #define _IF_DEQUEUE_ALL(ifq, m) do { \ 338 (m) = (ifq)->ifq_head; \ 339 (ifq)->ifq_head = (ifq)->ifq_tail = NULL; \ 340 (ifq)->ifq_len = 0; \ 341 } while (0) 342 343 #define IF_DEQUEUE_ALL(ifq, m) do { \ 344 IF_LOCK(ifq); \ 345 _IF_DEQUEUE_ALL(ifq, m); \ 346 IF_UNLOCK(ifq); \ 347 } while (0) 348 349 #define _IF_POLL(ifq, m) ((m) = (ifq)->ifq_head) 350 #define IF_POLL(ifq, m) _IF_POLL(ifq, m) 351 352 #define _IF_DRAIN(ifq) do { \ 353 struct mbuf *m; \ 354 for (;;) { \ 355 _IF_DEQUEUE(ifq, m); \ 356 if (m == NULL) \ 357 break; \ 358 m_freem(m); \ 359 } \ 360 } while (0) 361 362 #define IF_DRAIN(ifq) do { \ 363 IF_LOCK(ifq); \ 364 _IF_DRAIN(ifq); \ 365 IF_UNLOCK(ifq); \ 366 } while(0) 367 368 #ifdef _KERNEL 369 /* interface link layer address change event */ 370 typedef void (*iflladdr_event_handler_t)(void *, struct ifnet *); 371 EVENTHANDLER_DECLARE(iflladdr_event, iflladdr_event_handler_t); 372 /* interface address change event */ 373 typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *); 374 EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t); 375 /* new interface arrival event */ 376 typedef void (*ifnet_arrival_event_handler_t)(void *, struct ifnet *); 377 EVENTHANDLER_DECLARE(ifnet_arrival_event, ifnet_arrival_event_handler_t); 378 /* interface departure event */ 379 typedef void (*ifnet_departure_event_handler_t)(void *, struct ifnet *); 380 EVENTHANDLER_DECLARE(ifnet_departure_event, ifnet_departure_event_handler_t); 381 /* Interface link state change event */ 382 typedef void (*ifnet_link_event_handler_t)(void *, struct ifnet *, int); 383 EVENTHANDLER_DECLARE(ifnet_link_event, ifnet_link_event_handler_t); 384 385 /* 386 * interface groups 387 */ 388 struct ifg_group { 389 char ifg_group[IFNAMSIZ]; 390 u_int ifg_refcnt; 391 void *ifg_pf_kif; 392 TAILQ_HEAD(, ifg_member) ifg_members; 393 TAILQ_ENTRY(ifg_group) ifg_next; 394 }; 395 396 struct ifg_member { 397 TAILQ_ENTRY(ifg_member) ifgm_next; 398 struct ifnet *ifgm_ifp; 399 }; 400 401 struct ifg_list { 402 struct ifg_group *ifgl_group; 403 TAILQ_ENTRY(ifg_list) ifgl_next; 404 }; 405 406 /* group attach event */ 407 typedef void (*group_attach_event_handler_t)(void *, struct ifg_group *); 408 EVENTHANDLER_DECLARE(group_attach_event, group_attach_event_handler_t); 409 /* group detach event */ 410 typedef void (*group_detach_event_handler_t)(void *, struct ifg_group *); 411 EVENTHANDLER_DECLARE(group_detach_event, group_detach_event_handler_t); 412 /* group change event */ 413 typedef void (*group_change_event_handler_t)(void *, const char *); 414 EVENTHANDLER_DECLARE(group_change_event, group_change_event_handler_t); 415 416 #define IF_AFDATA_LOCK_INIT(ifp) \ 417 rw_init(&(ifp)->if_afdata_lock, "if_afdata") 418 419 #define IF_AFDATA_WLOCK(ifp) rw_wlock(&(ifp)->if_afdata_lock) 420 #define IF_AFDATA_RLOCK(ifp) rw_rlock(&(ifp)->if_afdata_lock) 421 #define IF_AFDATA_WUNLOCK(ifp) rw_wunlock(&(ifp)->if_afdata_lock) 422 #define IF_AFDATA_RUNLOCK(ifp) rw_runlock(&(ifp)->if_afdata_lock) 423 #define IF_AFDATA_LOCK(ifp) IF_AFDATA_WLOCK(ifp) 424 #define IF_AFDATA_UNLOCK(ifp) IF_AFDATA_WUNLOCK(ifp) 425 #define IF_AFDATA_TRYLOCK(ifp) rw_try_wlock(&(ifp)->if_afdata_lock) 426 #define IF_AFDATA_DESTROY(ifp) rw_destroy(&(ifp)->if_afdata_lock) 427 428 #define IF_AFDATA_LOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_LOCKED) 429 #define IF_AFDATA_RLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_RLOCKED) 430 #define IF_AFDATA_WLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_WLOCKED) 431 #define IF_AFDATA_UNLOCK_ASSERT(ifp) rw_assert(&(ifp)->if_afdata_lock, RA_UNLOCKED) 432 433 int if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, 434 int adjust); 435 #define IF_HANDOFF(ifq, m, ifp) \ 436 if_handoff((struct ifqueue *)ifq, m, ifp, 0) 437 #define IF_HANDOFF_ADJ(ifq, m, ifp, adj) \ 438 if_handoff((struct ifqueue *)ifq, m, ifp, adj) 439 440 void if_start(struct ifnet *); 441 442 #define IFQ_ENQUEUE(ifq, m, err) \ 443 do { \ 444 IF_LOCK(ifq); \ 445 if (ALTQ_IS_ENABLED(ifq)) \ 446 ALTQ_ENQUEUE(ifq, m, NULL, err); \ 447 else { \ 448 if (_IF_QFULL(ifq)) { \ 449 m_freem(m); \ 450 (err) = ENOBUFS; \ 451 } else { \ 452 _IF_ENQUEUE(ifq, m); \ 453 (err) = 0; \ 454 } \ 455 } \ 456 if (err) \ 457 (ifq)->ifq_drops++; \ 458 IF_UNLOCK(ifq); \ 459 } while (0) 460 461 #define IFQ_DEQUEUE_NOLOCK(ifq, m) \ 462 do { \ 463 if (TBR_IS_ENABLED(ifq)) \ 464 (m) = tbr_dequeue_ptr(ifq, ALTDQ_REMOVE); \ 465 else if (ALTQ_IS_ENABLED(ifq)) \ 466 ALTQ_DEQUEUE(ifq, m); \ 467 else \ 468 _IF_DEQUEUE(ifq, m); \ 469 } while (0) 470 471 #define IFQ_DEQUEUE(ifq, m) \ 472 do { \ 473 IF_LOCK(ifq); \ 474 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 475 IF_UNLOCK(ifq); \ 476 } while (0) 477 478 #define IFQ_POLL_NOLOCK(ifq, m) \ 479 do { \ 480 if (TBR_IS_ENABLED(ifq)) \ 481 (m) = tbr_dequeue_ptr(ifq, ALTDQ_POLL); \ 482 else if (ALTQ_IS_ENABLED(ifq)) \ 483 ALTQ_POLL(ifq, m); \ 484 else \ 485 _IF_POLL(ifq, m); \ 486 } while (0) 487 488 #define IFQ_POLL(ifq, m) \ 489 do { \ 490 IF_LOCK(ifq); \ 491 IFQ_POLL_NOLOCK(ifq, m); \ 492 IF_UNLOCK(ifq); \ 493 } while (0) 494 495 #define IFQ_PURGE_NOLOCK(ifq) \ 496 do { \ 497 if (ALTQ_IS_ENABLED(ifq)) { \ 498 ALTQ_PURGE(ifq); \ 499 } else \ 500 _IF_DRAIN(ifq); \ 501 } while (0) 502 503 #define IFQ_PURGE(ifq) \ 504 do { \ 505 IF_LOCK(ifq); \ 506 IFQ_PURGE_NOLOCK(ifq); \ 507 IF_UNLOCK(ifq); \ 508 } while (0) 509 510 #define IFQ_SET_READY(ifq) \ 511 do { ((ifq)->altq_flags |= ALTQF_READY); } while (0) 512 513 #define IFQ_LOCK(ifq) IF_LOCK(ifq) 514 #define IFQ_UNLOCK(ifq) IF_UNLOCK(ifq) 515 #define IFQ_LOCK_ASSERT(ifq) IF_LOCK_ASSERT(ifq) 516 #define IFQ_IS_EMPTY(ifq) ((ifq)->ifq_len == 0) 517 #define IFQ_INC_LEN(ifq) ((ifq)->ifq_len++) 518 #define IFQ_DEC_LEN(ifq) (--(ifq)->ifq_len) 519 #define IFQ_INC_DROPS(ifq) ((ifq)->ifq_drops++) 520 #define IFQ_SET_MAXLEN(ifq, len) ((ifq)->ifq_maxlen = (len)) 521 522 /* 523 * The IFF_DRV_OACTIVE test should really occur in the device driver, not in 524 * the handoff logic, as that flag is locked by the device driver. 525 */ 526 #define IFQ_HANDOFF_ADJ(ifp, m, adj, err) \ 527 do { \ 528 int len; \ 529 short mflags; \ 530 \ 531 len = (m)->m_pkthdr.len; \ 532 mflags = (m)->m_flags; \ 533 IFQ_ENQUEUE(&(ifp)->if_snd, m, err); \ 534 if ((err) == 0) { \ 535 (ifp)->if_obytes += len + (adj); \ 536 if (mflags & M_MCAST) \ 537 (ifp)->if_omcasts++; \ 538 if (((ifp)->if_drv_flags & IFF_DRV_OACTIVE) == 0) \ 539 if_start(ifp); \ 540 } \ 541 } while (0) 542 543 #define IFQ_HANDOFF(ifp, m, err) \ 544 IFQ_HANDOFF_ADJ(ifp, m, 0, err) 545 546 #define IFQ_DRV_DEQUEUE(ifq, m) \ 547 do { \ 548 (m) = (ifq)->ifq_drv_head; \ 549 if (m) { \ 550 if (((ifq)->ifq_drv_head = (m)->m_nextpkt) == NULL) \ 551 (ifq)->ifq_drv_tail = NULL; \ 552 (m)->m_nextpkt = NULL; \ 553 (ifq)->ifq_drv_len--; \ 554 } else { \ 555 IFQ_LOCK(ifq); \ 556 IFQ_DEQUEUE_NOLOCK(ifq, m); \ 557 while ((ifq)->ifq_drv_len < (ifq)->ifq_drv_maxlen) { \ 558 struct mbuf *m0; \ 559 IFQ_DEQUEUE_NOLOCK(ifq, m0); \ 560 if (m0 == NULL) \ 561 break; \ 562 m0->m_nextpkt = NULL; \ 563 if ((ifq)->ifq_drv_tail == NULL) \ 564 (ifq)->ifq_drv_head = m0; \ 565 else \ 566 (ifq)->ifq_drv_tail->m_nextpkt = m0; \ 567 (ifq)->ifq_drv_tail = m0; \ 568 (ifq)->ifq_drv_len++; \ 569 } \ 570 IFQ_UNLOCK(ifq); \ 571 } \ 572 } while (0) 573 574 #define IFQ_DRV_PREPEND(ifq, m) \ 575 do { \ 576 (m)->m_nextpkt = (ifq)->ifq_drv_head; \ 577 if ((ifq)->ifq_drv_tail == NULL) \ 578 (ifq)->ifq_drv_tail = (m); \ 579 (ifq)->ifq_drv_head = (m); \ 580 (ifq)->ifq_drv_len++; \ 581 } while (0) 582 583 #define IFQ_DRV_IS_EMPTY(ifq) \ 584 (((ifq)->ifq_drv_len == 0) && ((ifq)->ifq_len == 0)) 585 586 #define IFQ_DRV_PURGE(ifq) \ 587 do { \ 588 struct mbuf *m, *n = (ifq)->ifq_drv_head; \ 589 while((m = n) != NULL) { \ 590 n = m->m_nextpkt; \ 591 m_freem(m); \ 592 } \ 593 (ifq)->ifq_drv_head = (ifq)->ifq_drv_tail = NULL; \ 594 (ifq)->ifq_drv_len = 0; \ 595 IFQ_PURGE(ifq); \ 596 } while (0) 597 598 #ifdef _KERNEL 599 static __inline void 600 if_initbaudrate(struct ifnet *ifp, uintmax_t baud) 601 { 602 603 ifp->if_baudrate_pf = 0; 604 while (baud > (u_long)(~0UL)) { 605 baud /= 10; 606 ifp->if_baudrate_pf++; 607 } 608 ifp->if_baudrate = baud; 609 } 610 611 static __inline int 612 drbr_enqueue(struct ifnet *ifp, struct buf_ring *br, struct mbuf *m) 613 { 614 int error = 0; 615 616 #ifdef ALTQ 617 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 618 IFQ_ENQUEUE(&ifp->if_snd, m, error); 619 return (error); 620 } 621 #endif 622 error = buf_ring_enqueue(br, m); 623 if (error) 624 m_freem(m); 625 626 return (error); 627 } 628 629 static __inline void 630 drbr_putback(struct ifnet *ifp, struct buf_ring *br, struct mbuf *new) 631 { 632 /* 633 * The top of the list needs to be swapped 634 * for this one. 635 */ 636 #ifdef ALTQ 637 if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) { 638 /* 639 * Peek in altq case dequeued it 640 * so put it back. 641 */ 642 IFQ_DRV_PREPEND(&ifp->if_snd, new); 643 return; 644 } 645 #endif 646 buf_ring_putback_sc(br, new); 647 } 648 649 static __inline struct mbuf * 650 drbr_peek(struct ifnet *ifp, struct buf_ring *br) 651 { 652 #ifdef ALTQ 653 struct mbuf *m; 654 if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) { 655 /* 656 * Pull it off like a dequeue 657 * since drbr_advance() does nothing 658 * for altq and drbr_putback() will 659 * use the old prepend function. 660 */ 661 IFQ_DEQUEUE(&ifp->if_snd, m); 662 return (m); 663 } 664 #endif 665 return(buf_ring_peek(br)); 666 } 667 668 static __inline void 669 drbr_flush(struct ifnet *ifp, struct buf_ring *br) 670 { 671 struct mbuf *m; 672 673 #ifdef ALTQ 674 if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) 675 IFQ_PURGE(&ifp->if_snd); 676 #endif 677 while ((m = buf_ring_dequeue_sc(br)) != NULL) 678 m_freem(m); 679 } 680 681 static __inline void 682 drbr_free(struct buf_ring *br, struct malloc_type *type) 683 { 684 685 drbr_flush(NULL, br); 686 buf_ring_free(br, type); 687 } 688 689 static __inline struct mbuf * 690 drbr_dequeue(struct ifnet *ifp, struct buf_ring *br) 691 { 692 #ifdef ALTQ 693 struct mbuf *m; 694 695 if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) { 696 IFQ_DEQUEUE(&ifp->if_snd, m); 697 return (m); 698 } 699 #endif 700 return (buf_ring_dequeue_sc(br)); 701 } 702 703 static __inline void 704 drbr_advance(struct ifnet *ifp, struct buf_ring *br) 705 { 706 #ifdef ALTQ 707 /* Nothing to do here since peek dequeues in altq case */ 708 if (ifp != NULL && ALTQ_IS_ENABLED(&ifp->if_snd)) 709 return; 710 #endif 711 return (buf_ring_advance_sc(br)); 712 } 713 714 715 static __inline struct mbuf * 716 drbr_dequeue_cond(struct ifnet *ifp, struct buf_ring *br, 717 int (*func) (struct mbuf *, void *), void *arg) 718 { 719 struct mbuf *m; 720 #ifdef ALTQ 721 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 722 IFQ_LOCK(&ifp->if_snd); 723 IFQ_POLL_NOLOCK(&ifp->if_snd, m); 724 if (m != NULL && func(m, arg) == 0) { 725 IFQ_UNLOCK(&ifp->if_snd); 726 return (NULL); 727 } 728 IFQ_DEQUEUE_NOLOCK(&ifp->if_snd, m); 729 IFQ_UNLOCK(&ifp->if_snd); 730 return (m); 731 } 732 #endif 733 m = buf_ring_peek(br); 734 if (m == NULL || func(m, arg) == 0) 735 return (NULL); 736 737 return (buf_ring_dequeue_sc(br)); 738 } 739 740 static __inline int 741 drbr_empty(struct ifnet *ifp, struct buf_ring *br) 742 { 743 #ifdef ALTQ 744 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 745 return (IFQ_IS_EMPTY(&ifp->if_snd)); 746 #endif 747 return (buf_ring_empty(br)); 748 } 749 750 static __inline int 751 drbr_needs_enqueue(struct ifnet *ifp, struct buf_ring *br) 752 { 753 #ifdef ALTQ 754 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 755 return (1); 756 #endif 757 return (!buf_ring_empty(br)); 758 } 759 760 static __inline int 761 drbr_inuse(struct ifnet *ifp, struct buf_ring *br) 762 { 763 #ifdef ALTQ 764 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 765 return (ifp->if_snd.ifq_len); 766 #endif 767 return (buf_ring_count(br)); 768 } 769 #endif 770 /* 771 * 72 was chosen below because it is the size of a TCP/IP 772 * header (40) + the minimum mss (32). 773 */ 774 #define IF_MINMTU 72 775 #define IF_MAXMTU 65535 776 777 #define TOEDEV(ifp) ((ifp)->if_llsoftc) 778 779 #endif /* _KERNEL */ 780 781 /* 782 * The ifaddr structure contains information about one address 783 * of an interface. They are maintained by the different address families, 784 * are allocated and attached when an address is set, and are linked 785 * together so all addresses for an interface can be located. 786 * 787 * NOTE: a 'struct ifaddr' is always at the beginning of a larger 788 * chunk of malloc'ed memory, where we store the three addresses 789 * (ifa_addr, ifa_dstaddr and ifa_netmask) referenced here. 790 */ 791 struct ifaddr { 792 struct sockaddr *ifa_addr; /* address of interface */ 793 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */ 794 #define ifa_broadaddr ifa_dstaddr /* broadcast address interface */ 795 struct sockaddr *ifa_netmask; /* used to determine subnet */ 796 struct if_data if_data; /* not all members are meaningful */ 797 struct ifnet *ifa_ifp; /* back-pointer to interface */ 798 struct carp_softc *ifa_carp; /* pointer to CARP data */ 799 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */ 800 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */ 801 (int, struct rtentry *, struct rt_addrinfo *); 802 u_short ifa_flags; /* mostly rt_flags for cloning */ 803 u_int ifa_refcnt; /* references to this structure */ 804 int ifa_metric; /* cost of going out this interface */ 805 int (*ifa_claim_addr) /* check if an addr goes to this if */ 806 (struct ifaddr *, struct sockaddr *); 807 struct mtx ifa_mtx; 808 }; 809 #define IFA_ROUTE RTF_UP /* route installed */ 810 #define IFA_RTSELF RTF_HOST /* loopback route to self installed */ 811 812 /* for compatibility with other BSDs */ 813 #define ifa_list ifa_link 814 815 #ifdef _KERNEL 816 #define IFA_LOCK(ifa) mtx_lock(&(ifa)->ifa_mtx) 817 #define IFA_UNLOCK(ifa) mtx_unlock(&(ifa)->ifa_mtx) 818 819 void ifa_free(struct ifaddr *ifa); 820 void ifa_init(struct ifaddr *ifa); 821 void ifa_ref(struct ifaddr *ifa); 822 #endif 823 824 /* 825 * Multicast address structure. This is analogous to the ifaddr 826 * structure except that it keeps track of multicast addresses. 827 */ 828 struct ifmultiaddr { 829 TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */ 830 struct sockaddr *ifma_addr; /* address this membership is for */ 831 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */ 832 struct ifnet *ifma_ifp; /* back-pointer to interface */ 833 u_int ifma_refcount; /* reference count */ 834 void *ifma_protospec; /* protocol-specific state, if any */ 835 struct ifmultiaddr *ifma_llifma; /* pointer to ifma for ifma_lladdr */ 836 }; 837 838 #ifdef _KERNEL 839 840 extern struct rwlock ifnet_rwlock; 841 extern struct sx ifnet_sxlock; 842 843 #define IFNET_LOCK_INIT() do { \ 844 rw_init_flags(&ifnet_rwlock, "ifnet_rw", RW_RECURSE); \ 845 sx_init_flags(&ifnet_sxlock, "ifnet_sx", SX_RECURSE); \ 846 } while(0) 847 848 #define IFNET_WLOCK() do { \ 849 sx_xlock(&ifnet_sxlock); \ 850 rw_wlock(&ifnet_rwlock); \ 851 } while (0) 852 853 #define IFNET_WUNLOCK() do { \ 854 rw_wunlock(&ifnet_rwlock); \ 855 sx_xunlock(&ifnet_sxlock); \ 856 } while (0) 857 858 /* 859 * To assert the ifnet lock, you must know not only whether it's for read or 860 * write, but also whether it was acquired with sleep support or not. 861 */ 862 #define IFNET_RLOCK_ASSERT() sx_assert(&ifnet_sxlock, SA_SLOCKED) 863 #define IFNET_RLOCK_NOSLEEP_ASSERT() rw_assert(&ifnet_rwlock, RA_RLOCKED) 864 #define IFNET_WLOCK_ASSERT() do { \ 865 sx_assert(&ifnet_sxlock, SA_XLOCKED); \ 866 rw_assert(&ifnet_rwlock, RA_WLOCKED); \ 867 } while (0) 868 869 #define IFNET_RLOCK() sx_slock(&ifnet_sxlock) 870 #define IFNET_RLOCK_NOSLEEP() rw_rlock(&ifnet_rwlock) 871 #define IFNET_RUNLOCK() sx_sunlock(&ifnet_sxlock) 872 #define IFNET_RUNLOCK_NOSLEEP() rw_runlock(&ifnet_rwlock) 873 874 /* 875 * Look up an ifnet given its index; the _ref variant also acquires a 876 * reference that must be freed using if_rele(). It is almost always a bug 877 * to call ifnet_byindex() instead if ifnet_byindex_ref(). 878 */ 879 struct ifnet *ifnet_byindex(u_short idx); 880 struct ifnet *ifnet_byindex_locked(u_short idx); 881 struct ifnet *ifnet_byindex_ref(u_short idx); 882 883 /* 884 * Given the index, ifaddr_byindex() returns the one and only 885 * link-level ifaddr for the interface. You are not supposed to use 886 * it to traverse the list of addresses associated to the interface. 887 */ 888 struct ifaddr *ifaddr_byindex(u_short idx); 889 890 VNET_DECLARE(struct ifnethead, ifnet); 891 VNET_DECLARE(struct ifgrouphead, ifg_head); 892 VNET_DECLARE(int, if_index); 893 VNET_DECLARE(struct ifnet *, loif); /* first loopback interface */ 894 VNET_DECLARE(int, useloopback); 895 896 #define V_ifnet VNET(ifnet) 897 #define V_ifg_head VNET(ifg_head) 898 #define V_if_index VNET(if_index) 899 #define V_loif VNET(loif) 900 #define V_useloopback VNET(useloopback) 901 902 extern int ifqmaxlen; 903 904 int if_addgroup(struct ifnet *, const char *); 905 int if_delgroup(struct ifnet *, const char *); 906 int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **); 907 int if_allmulti(struct ifnet *, int); 908 struct ifnet* if_alloc(u_char); 909 void if_attach(struct ifnet *); 910 void if_dead(struct ifnet *); 911 int if_delmulti(struct ifnet *, struct sockaddr *); 912 void if_delmulti_ifma(struct ifmultiaddr *); 913 void if_detach(struct ifnet *); 914 void if_vmove(struct ifnet *, struct vnet *); 915 void if_purgeaddrs(struct ifnet *); 916 void if_delallmulti(struct ifnet *); 917 void if_down(struct ifnet *); 918 struct ifmultiaddr * 919 if_findmulti(struct ifnet *, struct sockaddr *); 920 void if_free(struct ifnet *); 921 void if_initname(struct ifnet *, const char *, int); 922 void if_link_state_change(struct ifnet *, int); 923 int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3); 924 void if_qflush(struct ifnet *); 925 void if_ref(struct ifnet *); 926 void if_rele(struct ifnet *); 927 int if_setlladdr(struct ifnet *, const u_char *, int); 928 void if_up(struct ifnet *); 929 int ifioctl(struct socket *, u_long, caddr_t, struct thread *); 930 int ifpromisc(struct ifnet *, int); 931 struct ifnet *ifunit(const char *); 932 struct ifnet *ifunit_ref(const char *); 933 934 void ifq_init(struct ifaltq *, struct ifnet *ifp); 935 void ifq_delete(struct ifaltq *); 936 937 int ifa_add_loopback_route(struct ifaddr *, struct sockaddr *); 938 int ifa_del_loopback_route(struct ifaddr *, struct sockaddr *); 939 940 struct ifaddr *ifa_ifwithaddr(struct sockaddr *); 941 int ifa_ifwithaddr_check(struct sockaddr *); 942 struct ifaddr *ifa_ifwithbroadaddr(struct sockaddr *); 943 struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *); 944 struct ifaddr *ifa_ifwithdstaddr_fib(struct sockaddr *, int); 945 struct ifaddr *ifa_ifwithnet(struct sockaddr *, int); 946 struct ifaddr *ifa_ifwithnet_fib(struct sockaddr *, int, int); 947 struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *); 948 struct ifaddr *ifa_ifwithroute_fib(int, struct sockaddr *, struct sockaddr *, u_int); 949 struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *); 950 int ifa_preferred(struct ifaddr *, struct ifaddr *); 951 952 int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen); 953 954 typedef void *if_com_alloc_t(u_char type, struct ifnet *ifp); 955 typedef void if_com_free_t(void *com, u_char type); 956 void if_register_com_alloc(u_char type, if_com_alloc_t *a, if_com_free_t *f); 957 void if_deregister_com_alloc(u_char type); 958 959 #define IF_LLADDR(ifp) \ 960 LLADDR((struct sockaddr_dl *)((ifp)->if_addr->ifa_addr)) 961 962 #ifdef DEVICE_POLLING 963 enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS }; 964 965 typedef int poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count); 966 int ether_poll_register(poll_handler_t *h, struct ifnet *ifp); 967 int ether_poll_deregister(struct ifnet *ifp); 968 #endif /* DEVICE_POLLING */ 969 970 #endif /* _KERNEL */ 971 972 #endif /* !_NET_IF_VAR_H_ */
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