1 /* 2 * Copyright (c) 1980, 1986, 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 * @(#)if.c 8.3 (Berkeley) 1/4/94 30 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 #include "opt_ifpoll.h" 37 38 #include <sys/param.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/systm.h> 42 #include <sys/proc.h> 43 #include <sys/priv.h> 44 #include <sys/protosw.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/socketops.h> 48 #include <sys/protosw.h> 49 #include <sys/kernel.h> 50 #include <sys/ktr.h> 51 #include <sys/mutex.h> 52 #include <sys/sockio.h> 53 #include <sys/syslog.h> 54 #include <sys/sysctl.h> 55 #include <sys/domain.h> 56 #include <sys/thread.h> 57 #include <sys/serialize.h> 58 #include <sys/bus.h> 59 60 #include <sys/thread2.h> 61 #include <sys/msgport2.h> 62 #include <sys/mutex2.h> 63 64 #include <net/if.h> 65 #include <net/if_arp.h> 66 #include <net/if_dl.h> 67 #include <net/if_types.h> 68 #include <net/if_var.h> 69 #include <net/ifq_var.h> 70 #include <net/radix.h> 71 #include <net/route.h> 72 #include <net/if_clone.h> 73 #include <net/netisr2.h> 74 #include <net/netmsg2.h> 75 76 #include <machine/atomic.h> 77 #include <machine/stdarg.h> 78 #include <machine/smp.h> 79 80 #if defined(INET) || defined(INET6) 81 /*XXX*/ 82 #include <netinet/in.h> 83 #include <netinet/in_var.h> 84 #include <netinet/if_ether.h> 85 #ifdef INET6 86 #include <netinet6/in6_var.h> 87 #include <netinet6/in6_ifattach.h> 88 #endif 89 #endif 90 91 #if defined(COMPAT_43) 92 #include <emulation/43bsd/43bsd_socket.h> 93 #endif /* COMPAT_43 */ 94 95 struct netmsg_ifaddr { 96 struct netmsg_base base; 97 struct ifaddr *ifa; 98 struct ifnet *ifp; 99 int tail; 100 }; 101 102 struct ifsubq_stage_head { 103 TAILQ_HEAD(, ifsubq_stage) stg_head; 104 } __cachealign; 105 106 /* 107 * System initialization 108 */ 109 static void if_attachdomain(void *); 110 static void if_attachdomain1(struct ifnet *); 111 static int ifconf(u_long, caddr_t, struct ucred *); 112 static void ifinit(void *); 113 static void ifnetinit(void *); 114 static void if_slowtimo(void *); 115 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 116 static int if_rtdel(struct radix_node *, void *); 117 118 /* Helper functions */ 119 static void ifsq_watchdog_reset(struct ifsubq_watchdog *); 120 121 #ifdef INET6 122 /* 123 * XXX: declare here to avoid to include many inet6 related files.. 124 * should be more generalized? 125 */ 126 extern void nd6_setmtu(struct ifnet *); 127 #endif 128 129 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 130 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 131 132 static int ifsq_stage_cntmax = 4; 133 TUNABLE_INT("net.link.stage_cntmax", &ifsq_stage_cntmax); 134 SYSCTL_INT(_net_link, OID_AUTO, stage_cntmax, CTLFLAG_RW, 135 &ifsq_stage_cntmax, 0, "ifq staging packet count max"); 136 137 static int if_stats_compat = 0; 138 SYSCTL_INT(_net_link, OID_AUTO, stats_compat, CTLFLAG_RW, 139 &if_stats_compat, 0, "Compat the old ifnet stats"); 140 141 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL) 142 /* Must be after netisr_init */ 143 SYSINIT(ifnet, SI_SUB_PRE_DRIVERS, SI_ORDER_SECOND, ifnetinit, NULL) 144 145 static if_com_alloc_t *if_com_alloc[256]; 146 static if_com_free_t *if_com_free[256]; 147 148 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 149 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 150 MALLOC_DEFINE(M_IFNET, "ifnet", "interface structure"); 151 152 int ifqmaxlen = IFQ_MAXLEN; 153 struct ifnethead ifnet = TAILQ_HEAD_INITIALIZER(ifnet); 154 155 struct callout if_slowtimo_timer; 156 157 int if_index = 0; 158 struct ifnet **ifindex2ifnet = NULL; 159 static struct thread ifnet_threads[MAXCPU]; 160 161 static struct ifsubq_stage_head ifsubq_stage_heads[MAXCPU]; 162 163 #ifdef notyet 164 #define IFQ_KTR_STRING "ifq=%p" 165 #define IFQ_KTR_ARGS struct ifaltq *ifq 166 #ifndef KTR_IFQ 167 #define KTR_IFQ KTR_ALL 168 #endif 169 KTR_INFO_MASTER(ifq); 170 KTR_INFO(KTR_IFQ, ifq, enqueue, 0, IFQ_KTR_STRING, IFQ_KTR_ARGS); 171 KTR_INFO(KTR_IFQ, ifq, dequeue, 1, IFQ_KTR_STRING, IFQ_KTR_ARGS); 172 #define logifq(name, arg) KTR_LOG(ifq_ ## name, arg) 173 174 #define IF_START_KTR_STRING "ifp=%p" 175 #define IF_START_KTR_ARGS struct ifnet *ifp 176 #ifndef KTR_IF_START 177 #define KTR_IF_START KTR_ALL 178 #endif 179 KTR_INFO_MASTER(if_start); 180 KTR_INFO(KTR_IF_START, if_start, run, 0, 181 IF_START_KTR_STRING, IF_START_KTR_ARGS); 182 KTR_INFO(KTR_IF_START, if_start, sched, 1, 183 IF_START_KTR_STRING, IF_START_KTR_ARGS); 184 KTR_INFO(KTR_IF_START, if_start, avoid, 2, 185 IF_START_KTR_STRING, IF_START_KTR_ARGS); 186 KTR_INFO(KTR_IF_START, if_start, contend_sched, 3, 187 IF_START_KTR_STRING, IF_START_KTR_ARGS); 188 KTR_INFO(KTR_IF_START, if_start, chase_sched, 4, 189 IF_START_KTR_STRING, IF_START_KTR_ARGS); 190 #define logifstart(name, arg) KTR_LOG(if_start_ ## name, arg) 191 #endif 192 193 TAILQ_HEAD(, ifg_group) ifg_head = TAILQ_HEAD_INITIALIZER(ifg_head); 194 195 /* 196 * Network interface utility routines. 197 * 198 * Routines with ifa_ifwith* names take sockaddr *'s as 199 * parameters. 200 */ 201 /* ARGSUSED*/ 202 void 203 ifinit(void *dummy) 204 { 205 struct ifnet *ifp; 206 207 callout_init(&if_slowtimo_timer); 208 209 crit_enter(); 210 TAILQ_FOREACH(ifp, &ifnet, if_link) { 211 if (ifp->if_snd.altq_maxlen == 0) { 212 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 213 ifq_set_maxlen(&ifp->if_snd, ifqmaxlen); 214 } 215 } 216 crit_exit(); 217 218 if_slowtimo(0); 219 } 220 221 static void 222 ifsq_ifstart_ipifunc(void *arg) 223 { 224 struct ifaltq_subque *ifsq = arg; 225 struct lwkt_msg *lmsg = ifsq_get_ifstart_lmsg(ifsq, mycpuid); 226 227 crit_enter(); 228 if (lmsg->ms_flags & MSGF_DONE) 229 lwkt_sendmsg(netisr_cpuport(mycpuid), lmsg); 230 crit_exit(); 231 } 232 233 static __inline void 234 ifsq_stage_remove(struct ifsubq_stage_head *head, struct ifsubq_stage *stage) 235 { 236 KKASSERT(stage->stg_flags & IFSQ_STAGE_FLAG_QUED); 237 TAILQ_REMOVE(&head->stg_head, stage, stg_link); 238 stage->stg_flags &= ~(IFSQ_STAGE_FLAG_QUED | IFSQ_STAGE_FLAG_SCHED); 239 stage->stg_cnt = 0; 240 stage->stg_len = 0; 241 } 242 243 static __inline void 244 ifsq_stage_insert(struct ifsubq_stage_head *head, struct ifsubq_stage *stage) 245 { 246 KKASSERT((stage->stg_flags & 247 (IFSQ_STAGE_FLAG_QUED | IFSQ_STAGE_FLAG_SCHED)) == 0); 248 stage->stg_flags |= IFSQ_STAGE_FLAG_QUED; 249 TAILQ_INSERT_TAIL(&head->stg_head, stage, stg_link); 250 } 251 252 /* 253 * Schedule ifnet.if_start on ifnet's CPU 254 */ 255 static void 256 ifsq_ifstart_schedule(struct ifaltq_subque *ifsq, int force) 257 { 258 int cpu; 259 260 if (!force && curthread->td_type == TD_TYPE_NETISR && 261 ifsq_stage_cntmax > 0) { 262 struct ifsubq_stage *stage = ifsq_get_stage(ifsq, mycpuid); 263 264 stage->stg_cnt = 0; 265 stage->stg_len = 0; 266 if ((stage->stg_flags & IFSQ_STAGE_FLAG_QUED) == 0) 267 ifsq_stage_insert(&ifsubq_stage_heads[mycpuid], stage); 268 stage->stg_flags |= IFSQ_STAGE_FLAG_SCHED; 269 return; 270 } 271 272 cpu = ifsq_get_cpuid(ifsq); 273 if (cpu != mycpuid) 274 lwkt_send_ipiq(globaldata_find(cpu), ifsq_ifstart_ipifunc, ifsq); 275 else 276 ifsq_ifstart_ipifunc(ifsq); 277 } 278 279 /* 280 * NOTE: 281 * This function will release ifnet.if_start interlock, 282 * if ifnet.if_start does not need to be scheduled 283 */ 284 static __inline int 285 ifsq_ifstart_need_schedule(struct ifaltq_subque *ifsq, int running) 286 { 287 if (!running || ifsq_is_empty(ifsq) 288 #ifdef ALTQ 289 || ifsq->ifsq_altq->altq_tbr != NULL 290 #endif 291 ) { 292 ALTQ_SQ_LOCK(ifsq); 293 /* 294 * ifnet.if_start interlock is released, if: 295 * 1) Hardware can not take any packets, due to 296 * o interface is marked down 297 * o hardware queue is full (ifq_is_oactive) 298 * Under the second situation, hardware interrupt 299 * or polling(4) will call/schedule ifnet.if_start 300 * when hardware queue is ready 301 * 2) There is not packet in the ifnet.if_snd. 302 * Further ifq_dispatch or ifq_handoff will call/ 303 * schedule ifnet.if_start 304 * 3) TBR is used and it does not allow further 305 * dequeueing. 306 * TBR callout will call ifnet.if_start 307 */ 308 if (!running || !ifsq_data_ready(ifsq)) { 309 ifsq_clr_started(ifsq); 310 ALTQ_SQ_UNLOCK(ifsq); 311 return 0; 312 } 313 ALTQ_SQ_UNLOCK(ifsq); 314 } 315 return 1; 316 } 317 318 static void 319 ifsq_ifstart_dispatch(netmsg_t msg) 320 { 321 struct lwkt_msg *lmsg = &msg->base.lmsg; 322 struct ifaltq_subque *ifsq = lmsg->u.ms_resultp; 323 struct ifnet *ifp = ifsq_get_ifp(ifsq); 324 int running = 0, need_sched; 325 326 crit_enter(); 327 lwkt_replymsg(lmsg, 0); /* reply ASAP */ 328 crit_exit(); 329 330 if (mycpuid != ifsq_get_cpuid(ifsq)) { 331 /* 332 * We need to chase the ifnet CPU change. 333 */ 334 ifsq_ifstart_schedule(ifsq, 1); 335 return; 336 } 337 338 ifsq_serialize_hw(ifsq); 339 if ((ifp->if_flags & IFF_RUNNING) && !ifsq_is_oactive(ifsq)) { 340 ifp->if_start(ifp, ifsq); 341 if ((ifp->if_flags & IFF_RUNNING) && !ifsq_is_oactive(ifsq)) 342 running = 1; 343 } 344 need_sched = ifsq_ifstart_need_schedule(ifsq, running); 345 ifsq_deserialize_hw(ifsq); 346 347 if (need_sched) { 348 /* 349 * More data need to be transmitted, ifnet.if_start is 350 * scheduled on ifnet's CPU, and we keep going. 351 * NOTE: ifnet.if_start interlock is not released. 352 */ 353 ifsq_ifstart_schedule(ifsq, 0); 354 } 355 } 356 357 /* Device driver ifnet.if_start helper function */ 358 void 359 ifsq_devstart(struct ifaltq_subque *ifsq) 360 { 361 struct ifnet *ifp = ifsq_get_ifp(ifsq); 362 int running = 0; 363 364 ASSERT_ALTQ_SQ_SERIALIZED_HW(ifsq); 365 366 ALTQ_SQ_LOCK(ifsq); 367 if (ifsq_is_started(ifsq) || !ifsq_data_ready(ifsq)) { 368 ALTQ_SQ_UNLOCK(ifsq); 369 return; 370 } 371 ifsq_set_started(ifsq); 372 ALTQ_SQ_UNLOCK(ifsq); 373 374 ifp->if_start(ifp, ifsq); 375 376 if ((ifp->if_flags & IFF_RUNNING) && !ifsq_is_oactive(ifsq)) 377 running = 1; 378 379 if (ifsq_ifstart_need_schedule(ifsq, running)) { 380 /* 381 * More data need to be transmitted, ifnet.if_start is 382 * scheduled on ifnet's CPU, and we keep going. 383 * NOTE: ifnet.if_start interlock is not released. 384 */ 385 ifsq_ifstart_schedule(ifsq, 0); 386 } 387 } 388 389 void 390 if_devstart(struct ifnet *ifp) 391 { 392 ifsq_devstart(ifq_get_subq_default(&ifp->if_snd)); 393 } 394 395 /* Device driver ifnet.if_start schedule helper function */ 396 void 397 ifsq_devstart_sched(struct ifaltq_subque *ifsq) 398 { 399 ifsq_ifstart_schedule(ifsq, 1); 400 } 401 402 void 403 if_devstart_sched(struct ifnet *ifp) 404 { 405 ifsq_devstart_sched(ifq_get_subq_default(&ifp->if_snd)); 406 } 407 408 static void 409 if_default_serialize(struct ifnet *ifp, enum ifnet_serialize slz __unused) 410 { 411 lwkt_serialize_enter(ifp->if_serializer); 412 } 413 414 static void 415 if_default_deserialize(struct ifnet *ifp, enum ifnet_serialize slz __unused) 416 { 417 lwkt_serialize_exit(ifp->if_serializer); 418 } 419 420 static int 421 if_default_tryserialize(struct ifnet *ifp, enum ifnet_serialize slz __unused) 422 { 423 return lwkt_serialize_try(ifp->if_serializer); 424 } 425 426 #ifdef INVARIANTS 427 static void 428 if_default_serialize_assert(struct ifnet *ifp, 429 enum ifnet_serialize slz __unused, 430 boolean_t serialized) 431 { 432 if (serialized) 433 ASSERT_SERIALIZED(ifp->if_serializer); 434 else 435 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 436 } 437 #endif 438 439 /* 440 * Attach an interface to the list of "active" interfaces. 441 * 442 * The serializer is optional. If non-NULL access to the interface 443 * may be MPSAFE. 444 */ 445 void 446 if_attach(struct ifnet *ifp, lwkt_serialize_t serializer) 447 { 448 unsigned socksize, ifasize; 449 int namelen, masklen; 450 struct sockaddr_dl *sdl; 451 struct ifaddr *ifa; 452 struct ifaltq *ifq; 453 int i, q; 454 455 static int if_indexlim = 8; 456 457 if (ifp->if_serialize != NULL) { 458 KASSERT(ifp->if_deserialize != NULL && 459 ifp->if_tryserialize != NULL && 460 ifp->if_serialize_assert != NULL, 461 ("serialize functions are partially setup")); 462 463 /* 464 * If the device supplies serialize functions, 465 * then clear if_serializer to catch any invalid 466 * usage of this field. 467 */ 468 KASSERT(serializer == NULL, 469 ("both serialize functions and default serializer " 470 "are supplied")); 471 ifp->if_serializer = NULL; 472 } else { 473 KASSERT(ifp->if_deserialize == NULL && 474 ifp->if_tryserialize == NULL && 475 ifp->if_serialize_assert == NULL, 476 ("serialize functions are partially setup")); 477 ifp->if_serialize = if_default_serialize; 478 ifp->if_deserialize = if_default_deserialize; 479 ifp->if_tryserialize = if_default_tryserialize; 480 #ifdef INVARIANTS 481 ifp->if_serialize_assert = if_default_serialize_assert; 482 #endif 483 484 /* 485 * The serializer can be passed in from the device, 486 * allowing the same serializer to be used for both 487 * the interrupt interlock and the device queue. 488 * If not specified, the netif structure will use an 489 * embedded serializer. 490 */ 491 if (serializer == NULL) { 492 serializer = &ifp->if_default_serializer; 493 lwkt_serialize_init(serializer); 494 } 495 ifp->if_serializer = serializer; 496 } 497 498 mtx_init(&ifp->if_ioctl_mtx); 499 mtx_lock(&ifp->if_ioctl_mtx); 500 501 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 502 ifp->if_index = ++if_index; 503 504 /* 505 * XXX - 506 * The old code would work if the interface passed a pre-existing 507 * chain of ifaddrs to this code. We don't trust our callers to 508 * properly initialize the tailq, however, so we no longer allow 509 * this unlikely case. 510 */ 511 ifp->if_addrheads = kmalloc(ncpus * sizeof(struct ifaddrhead), 512 M_IFADDR, M_WAITOK | M_ZERO); 513 for (i = 0; i < ncpus; ++i) 514 TAILQ_INIT(&ifp->if_addrheads[i]); 515 516 TAILQ_INIT(&ifp->if_prefixhead); 517 TAILQ_INIT(&ifp->if_multiaddrs); 518 TAILQ_INIT(&ifp->if_groups); 519 getmicrotime(&ifp->if_lastchange); 520 if (ifindex2ifnet == NULL || if_index >= if_indexlim) { 521 unsigned int n; 522 struct ifnet **q; 523 524 if_indexlim <<= 1; 525 526 /* grow ifindex2ifnet */ 527 n = if_indexlim * sizeof(*q); 528 q = kmalloc(n, M_IFADDR, M_WAITOK | M_ZERO); 529 if (ifindex2ifnet) { 530 bcopy(ifindex2ifnet, q, n/2); 531 kfree(ifindex2ifnet, M_IFADDR); 532 } 533 ifindex2ifnet = q; 534 } 535 536 ifindex2ifnet[if_index] = ifp; 537 538 /* 539 * create a Link Level name for this device 540 */ 541 namelen = strlen(ifp->if_xname); 542 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; 543 socksize = masklen + ifp->if_addrlen; 544 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 545 if (socksize < sizeof(*sdl)) 546 socksize = sizeof(*sdl); 547 socksize = ROUNDUP(socksize); 548 #undef ROUNDUP 549 ifasize = sizeof(struct ifaddr) + 2 * socksize; 550 ifa = ifa_create(ifasize, M_WAITOK); 551 sdl = (struct sockaddr_dl *)(ifa + 1); 552 sdl->sdl_len = socksize; 553 sdl->sdl_family = AF_LINK; 554 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 555 sdl->sdl_nlen = namelen; 556 sdl->sdl_index = ifp->if_index; 557 sdl->sdl_type = ifp->if_type; 558 ifp->if_lladdr = ifa; 559 ifa->ifa_ifp = ifp; 560 ifa->ifa_rtrequest = link_rtrequest; 561 ifa->ifa_addr = (struct sockaddr *)sdl; 562 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 563 ifa->ifa_netmask = (struct sockaddr *)sdl; 564 sdl->sdl_len = masklen; 565 while (namelen != 0) 566 sdl->sdl_data[--namelen] = 0xff; 567 ifa_iflink(ifa, ifp, 0 /* Insert head */); 568 569 ifp->if_data_pcpu = kmalloc_cachealign( 570 ncpus * sizeof(struct ifdata_pcpu), M_DEVBUF, M_WAITOK | M_ZERO); 571 572 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 573 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 574 575 if (ifp->if_mapsubq == NULL) 576 ifp->if_mapsubq = ifq_mapsubq_default; 577 578 ifq = &ifp->if_snd; 579 ifq->altq_type = 0; 580 ifq->altq_disc = NULL; 581 ifq->altq_flags &= ALTQF_CANTCHANGE; 582 ifq->altq_tbr = NULL; 583 ifq->altq_ifp = ifp; 584 585 if (ifq->altq_subq_cnt <= 0) 586 ifq->altq_subq_cnt = 1; 587 ifq->altq_subq = kmalloc_cachealign( 588 ifq->altq_subq_cnt * sizeof(struct ifaltq_subque), 589 M_DEVBUF, M_WAITOK | M_ZERO); 590 591 if (ifq->altq_maxlen == 0) { 592 if_printf(ifp, "driver didn't set ifq_maxlen\n"); 593 ifq_set_maxlen(ifq, ifqmaxlen); 594 } 595 596 for (q = 0; q < ifq->altq_subq_cnt; ++q) { 597 struct ifaltq_subque *ifsq = &ifq->altq_subq[q]; 598 599 ALTQ_SQ_LOCK_INIT(ifsq); 600 ifsq->ifsq_index = q; 601 602 ifsq->ifsq_altq = ifq; 603 ifsq->ifsq_ifp = ifp; 604 605 ifsq->ifq_maxlen = ifq->altq_maxlen; 606 ifsq->ifsq_prepended = NULL; 607 ifsq->ifsq_started = 0; 608 ifsq->ifsq_hw_oactive = 0; 609 ifsq_set_cpuid(ifsq, 0); 610 if (ifp->if_serializer != NULL) 611 ifsq_set_hw_serialize(ifsq, ifp->if_serializer); 612 613 ifsq->ifsq_stage = 614 kmalloc_cachealign(ncpus * sizeof(struct ifsubq_stage), 615 M_DEVBUF, M_WAITOK | M_ZERO); 616 for (i = 0; i < ncpus; ++i) 617 ifsq->ifsq_stage[i].stg_subq = ifsq; 618 619 ifsq->ifsq_ifstart_nmsg = 620 kmalloc(ncpus * sizeof(struct netmsg_base), 621 M_LWKTMSG, M_WAITOK); 622 for (i = 0; i < ncpus; ++i) { 623 netmsg_init(&ifsq->ifsq_ifstart_nmsg[i], NULL, 624 &netisr_adone_rport, 0, ifsq_ifstart_dispatch); 625 ifsq->ifsq_ifstart_nmsg[i].lmsg.u.ms_resultp = ifsq; 626 } 627 } 628 ifq_set_classic(ifq); 629 630 if (!SLIST_EMPTY(&domains)) 631 if_attachdomain1(ifp); 632 633 /* Announce the interface. */ 634 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 635 636 mtx_unlock(&ifp->if_ioctl_mtx); 637 } 638 639 static void 640 if_attachdomain(void *dummy) 641 { 642 struct ifnet *ifp; 643 644 crit_enter(); 645 TAILQ_FOREACH(ifp, &ifnet, if_list) 646 if_attachdomain1(ifp); 647 crit_exit(); 648 } 649 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 650 if_attachdomain, NULL); 651 652 static void 653 if_attachdomain1(struct ifnet *ifp) 654 { 655 struct domain *dp; 656 657 crit_enter(); 658 659 /* address family dependent data region */ 660 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 661 SLIST_FOREACH(dp, &domains, dom_next) 662 if (dp->dom_ifattach) 663 ifp->if_afdata[dp->dom_family] = 664 (*dp->dom_ifattach)(ifp); 665 crit_exit(); 666 } 667 668 /* 669 * Purge all addresses whose type is _not_ AF_LINK 670 */ 671 void 672 if_purgeaddrs_nolink(struct ifnet *ifp) 673 { 674 struct ifaddr_container *ifac, *next; 675 676 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], 677 ifa_link, next) { 678 struct ifaddr *ifa = ifac->ifa; 679 680 /* Leave link ifaddr as it is */ 681 if (ifa->ifa_addr->sa_family == AF_LINK) 682 continue; 683 #ifdef INET 684 /* XXX: Ugly!! ad hoc just for INET */ 685 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 686 struct ifaliasreq ifr; 687 #ifdef IFADDR_DEBUG_VERBOSE 688 int i; 689 690 kprintf("purge in4 addr %p: ", ifa); 691 for (i = 0; i < ncpus; ++i) 692 kprintf("%d ", ifa->ifa_containers[i].ifa_refcnt); 693 kprintf("\n"); 694 #endif 695 696 bzero(&ifr, sizeof ifr); 697 ifr.ifra_addr = *ifa->ifa_addr; 698 if (ifa->ifa_dstaddr) 699 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 700 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 701 NULL) == 0) 702 continue; 703 } 704 #endif /* INET */ 705 #ifdef INET6 706 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 707 #ifdef IFADDR_DEBUG_VERBOSE 708 int i; 709 710 kprintf("purge in6 addr %p: ", ifa); 711 for (i = 0; i < ncpus; ++i) 712 kprintf("%d ", ifa->ifa_containers[i].ifa_refcnt); 713 kprintf("\n"); 714 #endif 715 716 in6_purgeaddr(ifa); 717 /* ifp_addrhead is already updated */ 718 continue; 719 } 720 #endif /* INET6 */ 721 ifa_ifunlink(ifa, ifp); 722 ifa_destroy(ifa); 723 } 724 } 725 726 static void 727 ifq_stage_detach_handler(netmsg_t nmsg) 728 { 729 struct ifaltq *ifq = nmsg->lmsg.u.ms_resultp; 730 int q; 731 732 for (q = 0; q < ifq->altq_subq_cnt; ++q) { 733 struct ifaltq_subque *ifsq = &ifq->altq_subq[q]; 734 struct ifsubq_stage *stage = ifsq_get_stage(ifsq, mycpuid); 735 736 if (stage->stg_flags & IFSQ_STAGE_FLAG_QUED) 737 ifsq_stage_remove(&ifsubq_stage_heads[mycpuid], stage); 738 } 739 lwkt_replymsg(&nmsg->lmsg, 0); 740 } 741 742 static void 743 ifq_stage_detach(struct ifaltq *ifq) 744 { 745 struct netmsg_base base; 746 int cpu; 747 748 netmsg_init(&base, NULL, &curthread->td_msgport, 0, 749 ifq_stage_detach_handler); 750 base.lmsg.u.ms_resultp = ifq; 751 752 for (cpu = 0; cpu < ncpus; ++cpu) 753 lwkt_domsg(netisr_cpuport(cpu), &base.lmsg, 0); 754 } 755 756 /* 757 * Detach an interface, removing it from the 758 * list of "active" interfaces. 759 */ 760 void 761 if_detach(struct ifnet *ifp) 762 { 763 struct radix_node_head *rnh; 764 int i, q; 765 int cpu, origcpu; 766 struct domain *dp; 767 768 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 769 770 /* 771 * Remove routes and flush queues. 772 */ 773 crit_enter(); 774 #ifdef IFPOLL_ENABLE 775 if (ifp->if_flags & IFF_NPOLLING) 776 ifpoll_deregister(ifp); 777 #endif 778 if_down(ifp); 779 780 #ifdef ALTQ 781 if (ifq_is_enabled(&ifp->if_snd)) 782 altq_disable(&ifp->if_snd); 783 if (ifq_is_attached(&ifp->if_snd)) 784 altq_detach(&ifp->if_snd); 785 #endif 786 787 /* 788 * Clean up all addresses. 789 */ 790 ifp->if_lladdr = NULL; 791 792 if_purgeaddrs_nolink(ifp); 793 if (!TAILQ_EMPTY(&ifp->if_addrheads[mycpuid])) { 794 struct ifaddr *ifa; 795 796 ifa = TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa; 797 KASSERT(ifa->ifa_addr->sa_family == AF_LINK, 798 ("non-link ifaddr is left on if_addrheads")); 799 800 ifa_ifunlink(ifa, ifp); 801 ifa_destroy(ifa); 802 KASSERT(TAILQ_EMPTY(&ifp->if_addrheads[mycpuid]), 803 ("there are still ifaddrs left on if_addrheads")); 804 } 805 806 #ifdef INET 807 /* 808 * Remove all IPv4 kernel structures related to ifp. 809 */ 810 in_ifdetach(ifp); 811 #endif 812 813 #ifdef INET6 814 /* 815 * Remove all IPv6 kernel structs related to ifp. This should be done 816 * before removing routing entries below, since IPv6 interface direct 817 * routes are expected to be removed by the IPv6-specific kernel API. 818 * Otherwise, the kernel will detect some inconsistency and bark it. 819 */ 820 in6_ifdetach(ifp); 821 #endif 822 823 /* 824 * Delete all remaining routes using this interface 825 * Unfortuneatly the only way to do this is to slog through 826 * the entire routing table looking for routes which point 827 * to this interface...oh well... 828 */ 829 origcpu = mycpuid; 830 for (cpu = 0; cpu < ncpus; cpu++) { 831 lwkt_migratecpu(cpu); 832 for (i = 1; i <= AF_MAX; i++) { 833 if ((rnh = rt_tables[cpu][i]) == NULL) 834 continue; 835 rnh->rnh_walktree(rnh, if_rtdel, ifp); 836 } 837 } 838 lwkt_migratecpu(origcpu); 839 840 /* Announce that the interface is gone. */ 841 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 842 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 843 844 SLIST_FOREACH(dp, &domains, dom_next) 845 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 846 (*dp->dom_ifdetach)(ifp, 847 ifp->if_afdata[dp->dom_family]); 848 849 /* 850 * Remove interface from ifindex2ifp[] and maybe decrement if_index. 851 */ 852 ifindex2ifnet[ifp->if_index] = NULL; 853 while (if_index > 0 && ifindex2ifnet[if_index] == NULL) 854 if_index--; 855 856 TAILQ_REMOVE(&ifnet, ifp, if_link); 857 kfree(ifp->if_addrheads, M_IFADDR); 858 859 lwkt_synchronize_ipiqs("if_detach"); 860 ifq_stage_detach(&ifp->if_snd); 861 862 for (q = 0; q < ifp->if_snd.altq_subq_cnt; ++q) { 863 struct ifaltq_subque *ifsq = &ifp->if_snd.altq_subq[q]; 864 865 kfree(ifsq->ifsq_ifstart_nmsg, M_LWKTMSG); 866 kfree(ifsq->ifsq_stage, M_DEVBUF); 867 } 868 kfree(ifp->if_snd.altq_subq, M_DEVBUF); 869 870 kfree(ifp->if_data_pcpu, M_DEVBUF); 871 872 crit_exit(); 873 } 874 875 /* 876 * Create interface group without members 877 */ 878 struct ifg_group * 879 if_creategroup(const char *groupname) 880 { 881 struct ifg_group *ifg = NULL; 882 883 if ((ifg = (struct ifg_group *)kmalloc(sizeof(struct ifg_group), 884 M_TEMP, M_NOWAIT)) == NULL) 885 return (NULL); 886 887 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 888 ifg->ifg_refcnt = 0; 889 ifg->ifg_carp_demoted = 0; 890 TAILQ_INIT(&ifg->ifg_members); 891 #if NPF > 0 892 pfi_attach_ifgroup(ifg); 893 #endif 894 TAILQ_INSERT_TAIL(&ifg_head, ifg, ifg_next); 895 896 return (ifg); 897 } 898 899 /* 900 * Add a group to an interface 901 */ 902 int 903 if_addgroup(struct ifnet *ifp, const char *groupname) 904 { 905 struct ifg_list *ifgl; 906 struct ifg_group *ifg = NULL; 907 struct ifg_member *ifgm; 908 909 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 910 groupname[strlen(groupname) - 1] <= '9') 911 return (EINVAL); 912 913 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 914 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 915 return (EEXIST); 916 917 if ((ifgl = kmalloc(sizeof(*ifgl), M_TEMP, M_NOWAIT)) == NULL) 918 return (ENOMEM); 919 920 if ((ifgm = kmalloc(sizeof(*ifgm), M_TEMP, M_NOWAIT)) == NULL) { 921 kfree(ifgl, M_TEMP); 922 return (ENOMEM); 923 } 924 925 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 926 if (!strcmp(ifg->ifg_group, groupname)) 927 break; 928 929 if (ifg == NULL && (ifg = if_creategroup(groupname)) == NULL) { 930 kfree(ifgl, M_TEMP); 931 kfree(ifgm, M_TEMP); 932 return (ENOMEM); 933 } 934 935 ifg->ifg_refcnt++; 936 ifgl->ifgl_group = ifg; 937 ifgm->ifgm_ifp = ifp; 938 939 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 940 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 941 942 #if NPF > 0 943 pfi_group_change(groupname); 944 #endif 945 946 return (0); 947 } 948 949 /* 950 * Remove a group from an interface 951 */ 952 int 953 if_delgroup(struct ifnet *ifp, const char *groupname) 954 { 955 struct ifg_list *ifgl; 956 struct ifg_member *ifgm; 957 958 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 959 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 960 break; 961 if (ifgl == NULL) 962 return (ENOENT); 963 964 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 965 966 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 967 if (ifgm->ifgm_ifp == ifp) 968 break; 969 970 if (ifgm != NULL) { 971 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 972 kfree(ifgm, M_TEMP); 973 } 974 975 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 976 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next); 977 #if NPF > 0 978 pfi_detach_ifgroup(ifgl->ifgl_group); 979 #endif 980 kfree(ifgl->ifgl_group, M_TEMP); 981 } 982 983 kfree(ifgl, M_TEMP); 984 985 #if NPF > 0 986 pfi_group_change(groupname); 987 #endif 988 989 return (0); 990 } 991 992 /* 993 * Stores all groups from an interface in memory pointed 994 * to by data 995 */ 996 int 997 if_getgroup(caddr_t data, struct ifnet *ifp) 998 { 999 int len, error; 1000 struct ifg_list *ifgl; 1001 struct ifg_req ifgrq, *ifgp; 1002 struct ifgroupreq *ifgr = (struct ifgroupreq *)data; 1003 1004 if (ifgr->ifgr_len == 0) { 1005 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1006 ifgr->ifgr_len += sizeof(struct ifg_req); 1007 return (0); 1008 } 1009 1010 len = ifgr->ifgr_len; 1011 ifgp = ifgr->ifgr_groups; 1012 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1013 if (len < sizeof(ifgrq)) 1014 return (EINVAL); 1015 bzero(&ifgrq, sizeof ifgrq); 1016 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1017 sizeof(ifgrq.ifgrq_group)); 1018 if ((error = copyout((caddr_t)&ifgrq, (caddr_t)ifgp, 1019 sizeof(struct ifg_req)))) 1020 return (error); 1021 len -= sizeof(ifgrq); 1022 ifgp++; 1023 } 1024 1025 return (0); 1026 } 1027 1028 /* 1029 * Stores all members of a group in memory pointed to by data 1030 */ 1031 int 1032 if_getgroupmembers(caddr_t data) 1033 { 1034 struct ifgroupreq *ifgr = (struct ifgroupreq *)data; 1035 struct ifg_group *ifg; 1036 struct ifg_member *ifgm; 1037 struct ifg_req ifgrq, *ifgp; 1038 int len, error; 1039 1040 TAILQ_FOREACH(ifg, &ifg_head, ifg_next) 1041 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1042 break; 1043 if (ifg == NULL) 1044 return (ENOENT); 1045 1046 if (ifgr->ifgr_len == 0) { 1047 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1048 ifgr->ifgr_len += sizeof(ifgrq); 1049 return (0); 1050 } 1051 1052 len = ifgr->ifgr_len; 1053 ifgp = ifgr->ifgr_groups; 1054 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1055 if (len < sizeof(ifgrq)) 1056 return (EINVAL); 1057 bzero(&ifgrq, sizeof ifgrq); 1058 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1059 sizeof(ifgrq.ifgrq_member)); 1060 if ((error = copyout((caddr_t)&ifgrq, (caddr_t)ifgp, 1061 sizeof(struct ifg_req)))) 1062 return (error); 1063 len -= sizeof(ifgrq); 1064 ifgp++; 1065 } 1066 1067 return (0); 1068 } 1069 1070 /* 1071 * Delete Routes for a Network Interface 1072 * 1073 * Called for each routing entry via the rnh->rnh_walktree() call above 1074 * to delete all route entries referencing a detaching network interface. 1075 * 1076 * Arguments: 1077 * rn pointer to node in the routing table 1078 * arg argument passed to rnh->rnh_walktree() - detaching interface 1079 * 1080 * Returns: 1081 * 0 successful 1082 * errno failed - reason indicated 1083 * 1084 */ 1085 static int 1086 if_rtdel(struct radix_node *rn, void *arg) 1087 { 1088 struct rtentry *rt = (struct rtentry *)rn; 1089 struct ifnet *ifp = arg; 1090 int err; 1091 1092 if (rt->rt_ifp == ifp) { 1093 1094 /* 1095 * Protect (sorta) against walktree recursion problems 1096 * with cloned routes 1097 */ 1098 if (!(rt->rt_flags & RTF_UP)) 1099 return (0); 1100 1101 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1102 rt_mask(rt), rt->rt_flags, 1103 NULL); 1104 if (err) { 1105 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1106 } 1107 } 1108 1109 return (0); 1110 } 1111 1112 /* 1113 * Locate an interface based on a complete address. 1114 */ 1115 struct ifaddr * 1116 ifa_ifwithaddr(struct sockaddr *addr) 1117 { 1118 struct ifnet *ifp; 1119 1120 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1121 struct ifaddr_container *ifac; 1122 1123 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1124 struct ifaddr *ifa = ifac->ifa; 1125 1126 if (ifa->ifa_addr->sa_family != addr->sa_family) 1127 continue; 1128 if (sa_equal(addr, ifa->ifa_addr)) 1129 return (ifa); 1130 if ((ifp->if_flags & IFF_BROADCAST) && 1131 ifa->ifa_broadaddr && 1132 /* IPv6 doesn't have broadcast */ 1133 ifa->ifa_broadaddr->sa_len != 0 && 1134 sa_equal(ifa->ifa_broadaddr, addr)) 1135 return (ifa); 1136 } 1137 } 1138 return (NULL); 1139 } 1140 /* 1141 * Locate the point to point interface with a given destination address. 1142 */ 1143 struct ifaddr * 1144 ifa_ifwithdstaddr(struct sockaddr *addr) 1145 { 1146 struct ifnet *ifp; 1147 1148 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1149 struct ifaddr_container *ifac; 1150 1151 if (!(ifp->if_flags & IFF_POINTOPOINT)) 1152 continue; 1153 1154 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1155 struct ifaddr *ifa = ifac->ifa; 1156 1157 if (ifa->ifa_addr->sa_family != addr->sa_family) 1158 continue; 1159 if (ifa->ifa_dstaddr && 1160 sa_equal(addr, ifa->ifa_dstaddr)) 1161 return (ifa); 1162 } 1163 } 1164 return (NULL); 1165 } 1166 1167 /* 1168 * Find an interface on a specific network. If many, choice 1169 * is most specific found. 1170 */ 1171 struct ifaddr * 1172 ifa_ifwithnet(struct sockaddr *addr) 1173 { 1174 struct ifnet *ifp; 1175 struct ifaddr *ifa_maybe = NULL; 1176 u_int af = addr->sa_family; 1177 char *addr_data = addr->sa_data, *cplim; 1178 1179 /* 1180 * AF_LINK addresses can be looked up directly by their index number, 1181 * so do that if we can. 1182 */ 1183 if (af == AF_LINK) { 1184 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1185 1186 if (sdl->sdl_index && sdl->sdl_index <= if_index) 1187 return (ifindex2ifnet[sdl->sdl_index]->if_lladdr); 1188 } 1189 1190 /* 1191 * Scan though each interface, looking for ones that have 1192 * addresses in this address family. 1193 */ 1194 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1195 struct ifaddr_container *ifac; 1196 1197 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1198 struct ifaddr *ifa = ifac->ifa; 1199 char *cp, *cp2, *cp3; 1200 1201 if (ifa->ifa_addr->sa_family != af) 1202 next: continue; 1203 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 1204 /* 1205 * This is a bit broken as it doesn't 1206 * take into account that the remote end may 1207 * be a single node in the network we are 1208 * looking for. 1209 * The trouble is that we don't know the 1210 * netmask for the remote end. 1211 */ 1212 if (ifa->ifa_dstaddr != NULL && 1213 sa_equal(addr, ifa->ifa_dstaddr)) 1214 return (ifa); 1215 } else { 1216 /* 1217 * if we have a special address handler, 1218 * then use it instead of the generic one. 1219 */ 1220 if (ifa->ifa_claim_addr) { 1221 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1222 return (ifa); 1223 } else { 1224 continue; 1225 } 1226 } 1227 1228 /* 1229 * Scan all the bits in the ifa's address. 1230 * If a bit dissagrees with what we are 1231 * looking for, mask it with the netmask 1232 * to see if it really matters. 1233 * (A byte at a time) 1234 */ 1235 if (ifa->ifa_netmask == 0) 1236 continue; 1237 cp = addr_data; 1238 cp2 = ifa->ifa_addr->sa_data; 1239 cp3 = ifa->ifa_netmask->sa_data; 1240 cplim = ifa->ifa_netmask->sa_len + 1241 (char *)ifa->ifa_netmask; 1242 while (cp3 < cplim) 1243 if ((*cp++ ^ *cp2++) & *cp3++) 1244 goto next; /* next address! */ 1245 /* 1246 * If the netmask of what we just found 1247 * is more specific than what we had before 1248 * (if we had one) then remember the new one 1249 * before continuing to search 1250 * for an even better one. 1251 */ 1252 if (ifa_maybe == NULL || 1253 rn_refines((char *)ifa->ifa_netmask, 1254 (char *)ifa_maybe->ifa_netmask)) 1255 ifa_maybe = ifa; 1256 } 1257 } 1258 } 1259 return (ifa_maybe); 1260 } 1261 1262 /* 1263 * Find an interface address specific to an interface best matching 1264 * a given address. 1265 */ 1266 struct ifaddr * 1267 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1268 { 1269 struct ifaddr_container *ifac; 1270 char *cp, *cp2, *cp3; 1271 char *cplim; 1272 struct ifaddr *ifa_maybe = NULL; 1273 u_int af = addr->sa_family; 1274 1275 if (af >= AF_MAX) 1276 return (0); 1277 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1278 struct ifaddr *ifa = ifac->ifa; 1279 1280 if (ifa->ifa_addr->sa_family != af) 1281 continue; 1282 if (ifa_maybe == NULL) 1283 ifa_maybe = ifa; 1284 if (ifa->ifa_netmask == NULL) { 1285 if (sa_equal(addr, ifa->ifa_addr) || 1286 (ifa->ifa_dstaddr != NULL && 1287 sa_equal(addr, ifa->ifa_dstaddr))) 1288 return (ifa); 1289 continue; 1290 } 1291 if (ifp->if_flags & IFF_POINTOPOINT) { 1292 if (sa_equal(addr, ifa->ifa_dstaddr)) 1293 return (ifa); 1294 } else { 1295 cp = addr->sa_data; 1296 cp2 = ifa->ifa_addr->sa_data; 1297 cp3 = ifa->ifa_netmask->sa_data; 1298 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1299 for (; cp3 < cplim; cp3++) 1300 if ((*cp++ ^ *cp2++) & *cp3) 1301 break; 1302 if (cp3 == cplim) 1303 return (ifa); 1304 } 1305 } 1306 return (ifa_maybe); 1307 } 1308 1309 /* 1310 * Default action when installing a route with a Link Level gateway. 1311 * Lookup an appropriate real ifa to point to. 1312 * This should be moved to /sys/net/link.c eventually. 1313 */ 1314 static void 1315 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1316 { 1317 struct ifaddr *ifa; 1318 struct sockaddr *dst; 1319 struct ifnet *ifp; 1320 1321 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL || 1322 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL) 1323 return; 1324 ifa = ifaof_ifpforaddr(dst, ifp); 1325 if (ifa != NULL) { 1326 IFAFREE(rt->rt_ifa); 1327 IFAREF(ifa); 1328 rt->rt_ifa = ifa; 1329 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1330 ifa->ifa_rtrequest(cmd, rt, info); 1331 } 1332 } 1333 1334 /* 1335 * Mark an interface down and notify protocols of 1336 * the transition. 1337 * NOTE: must be called at splnet or eqivalent. 1338 */ 1339 void 1340 if_unroute(struct ifnet *ifp, int flag, int fam) 1341 { 1342 struct ifaddr_container *ifac; 1343 1344 ifp->if_flags &= ~flag; 1345 getmicrotime(&ifp->if_lastchange); 1346 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1347 struct ifaddr *ifa = ifac->ifa; 1348 1349 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1350 kpfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1351 } 1352 ifq_purge_all(&ifp->if_snd); 1353 rt_ifmsg(ifp); 1354 } 1355 1356 /* 1357 * Mark an interface up and notify protocols of 1358 * the transition. 1359 * NOTE: must be called at splnet or eqivalent. 1360 */ 1361 void 1362 if_route(struct ifnet *ifp, int flag, int fam) 1363 { 1364 struct ifaddr_container *ifac; 1365 1366 ifq_purge_all(&ifp->if_snd); 1367 ifp->if_flags |= flag; 1368 getmicrotime(&ifp->if_lastchange); 1369 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1370 struct ifaddr *ifa = ifac->ifa; 1371 1372 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1373 kpfctlinput(PRC_IFUP, ifa->ifa_addr); 1374 } 1375 rt_ifmsg(ifp); 1376 #ifdef INET6 1377 in6_if_up(ifp); 1378 #endif 1379 } 1380 1381 /* 1382 * Mark an interface down and notify protocols of the transition. An 1383 * interface going down is also considered to be a synchronizing event. 1384 * We must ensure that all packet processing related to the interface 1385 * has completed before we return so e.g. the caller can free the ifnet 1386 * structure that the mbufs may be referencing. 1387 * 1388 * NOTE: must be called at splnet or eqivalent. 1389 */ 1390 void 1391 if_down(struct ifnet *ifp) 1392 { 1393 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1394 netmsg_service_sync(); 1395 } 1396 1397 /* 1398 * Mark an interface up and notify protocols of 1399 * the transition. 1400 * NOTE: must be called at splnet or eqivalent. 1401 */ 1402 void 1403 if_up(struct ifnet *ifp) 1404 { 1405 if_route(ifp, IFF_UP, AF_UNSPEC); 1406 } 1407 1408 /* 1409 * Process a link state change. 1410 * NOTE: must be called at splsoftnet or equivalent. 1411 */ 1412 void 1413 if_link_state_change(struct ifnet *ifp) 1414 { 1415 int link_state = ifp->if_link_state; 1416 1417 rt_ifmsg(ifp); 1418 devctl_notify("IFNET", ifp->if_xname, 1419 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1420 } 1421 1422 /* 1423 * Handle interface watchdog timer routines. Called 1424 * from softclock, we decrement timers (if set) and 1425 * call the appropriate interface routine on expiration. 1426 */ 1427 static void 1428 if_slowtimo(void *arg) 1429 { 1430 struct ifnet *ifp; 1431 1432 crit_enter(); 1433 1434 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1435 if (if_stats_compat) { 1436 IFNET_STAT_GET(ifp, ipackets, ifp->if_ipackets); 1437 IFNET_STAT_GET(ifp, ierrors, ifp->if_ierrors); 1438 IFNET_STAT_GET(ifp, opackets, ifp->if_opackets); 1439 IFNET_STAT_GET(ifp, oerrors, ifp->if_oerrors); 1440 IFNET_STAT_GET(ifp, collisions, ifp->if_collisions); 1441 IFNET_STAT_GET(ifp, ibytes, ifp->if_ibytes); 1442 IFNET_STAT_GET(ifp, obytes, ifp->if_obytes); 1443 IFNET_STAT_GET(ifp, imcasts, ifp->if_imcasts); 1444 IFNET_STAT_GET(ifp, omcasts, ifp->if_omcasts); 1445 IFNET_STAT_GET(ifp, iqdrops, ifp->if_iqdrops); 1446 IFNET_STAT_GET(ifp, noproto, ifp->if_noproto); 1447 } 1448 1449 if (ifp->if_timer == 0 || --ifp->if_timer) 1450 continue; 1451 if (ifp->if_watchdog) { 1452 if (ifnet_tryserialize_all(ifp)) { 1453 (*ifp->if_watchdog)(ifp); 1454 ifnet_deserialize_all(ifp); 1455 } else { 1456 /* try again next timeout */ 1457 ++ifp->if_timer; 1458 } 1459 } 1460 } 1461 1462 crit_exit(); 1463 1464 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 1465 } 1466 1467 /* 1468 * Map interface name to 1469 * interface structure pointer. 1470 */ 1471 struct ifnet * 1472 ifunit(const char *name) 1473 { 1474 struct ifnet *ifp; 1475 1476 /* 1477 * Search all the interfaces for this name/number 1478 */ 1479 1480 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1481 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0) 1482 break; 1483 } 1484 return (ifp); 1485 } 1486 1487 1488 /* 1489 * Map interface name in a sockaddr_dl to 1490 * interface structure pointer. 1491 */ 1492 struct ifnet * 1493 if_withname(struct sockaddr *sa) 1494 { 1495 char ifname[IFNAMSIZ+1]; 1496 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 1497 1498 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 1499 (sdl->sdl_nlen > IFNAMSIZ) ) 1500 return NULL; 1501 1502 /* 1503 * ifunit wants a null-terminated name. It may not be null-terminated 1504 * in the sockaddr. We don't want to change the caller's sockaddr, 1505 * and there might not be room to put the trailing null anyway, so we 1506 * make a local copy that we know we can null terminate safely. 1507 */ 1508 1509 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 1510 ifname[sdl->sdl_nlen] = '\0'; 1511 return ifunit(ifname); 1512 } 1513 1514 1515 /* 1516 * Interface ioctls. 1517 */ 1518 int 1519 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct ucred *cred) 1520 { 1521 struct ifnet *ifp; 1522 struct ifreq *ifr; 1523 struct ifstat *ifs; 1524 int error; 1525 short oif_flags; 1526 int new_flags; 1527 #ifdef COMPAT_43 1528 int ocmd; 1529 #endif 1530 size_t namelen, onamelen; 1531 char new_name[IFNAMSIZ]; 1532 struct ifaddr *ifa; 1533 struct sockaddr_dl *sdl; 1534 1535 switch (cmd) { 1536 case SIOCGIFCONF: 1537 case OSIOCGIFCONF: 1538 return (ifconf(cmd, data, cred)); 1539 default: 1540 break; 1541 } 1542 1543 ifr = (struct ifreq *)data; 1544 1545 switch (cmd) { 1546 case SIOCIFCREATE: 1547 case SIOCIFCREATE2: 1548 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0) 1549 return (error); 1550 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 1551 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 1552 case SIOCIFDESTROY: 1553 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0) 1554 return (error); 1555 return (if_clone_destroy(ifr->ifr_name)); 1556 case SIOCIFGCLONERS: 1557 return (if_clone_list((struct if_clonereq *)data)); 1558 default: 1559 break; 1560 } 1561 1562 /* 1563 * Nominal ioctl through interface, lookup the ifp and obtain a 1564 * lock to serialize the ifconfig ioctl operation. 1565 */ 1566 ifp = ifunit(ifr->ifr_name); 1567 if (ifp == NULL) 1568 return (ENXIO); 1569 error = 0; 1570 mtx_lock(&ifp->if_ioctl_mtx); 1571 1572 switch (cmd) { 1573 case SIOCGIFINDEX: 1574 ifr->ifr_index = ifp->if_index; 1575 break; 1576 1577 case SIOCGIFFLAGS: 1578 ifr->ifr_flags = ifp->if_flags; 1579 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1580 break; 1581 1582 case SIOCGIFCAP: 1583 ifr->ifr_reqcap = ifp->if_capabilities; 1584 ifr->ifr_curcap = ifp->if_capenable; 1585 break; 1586 1587 case SIOCGIFMETRIC: 1588 ifr->ifr_metric = ifp->if_metric; 1589 break; 1590 1591 case SIOCGIFMTU: 1592 ifr->ifr_mtu = ifp->if_mtu; 1593 break; 1594 1595 case SIOCGIFTSOLEN: 1596 ifr->ifr_tsolen = ifp->if_tsolen; 1597 break; 1598 1599 case SIOCGIFDATA: 1600 error = copyout((caddr_t)&ifp->if_data, ifr->ifr_data, 1601 sizeof(ifp->if_data)); 1602 break; 1603 1604 case SIOCGIFPHYS: 1605 ifr->ifr_phys = ifp->if_physical; 1606 break; 1607 1608 case SIOCGIFPOLLCPU: 1609 ifr->ifr_pollcpu = -1; 1610 break; 1611 1612 case SIOCSIFPOLLCPU: 1613 break; 1614 1615 case SIOCSIFFLAGS: 1616 error = priv_check_cred(cred, PRIV_ROOT, 0); 1617 if (error) 1618 break; 1619 new_flags = (ifr->ifr_flags & 0xffff) | 1620 (ifr->ifr_flagshigh << 16); 1621 if (ifp->if_flags & IFF_SMART) { 1622 /* Smart drivers twiddle their own routes */ 1623 } else if (ifp->if_flags & IFF_UP && 1624 (new_flags & IFF_UP) == 0) { 1625 crit_enter(); 1626 if_down(ifp); 1627 crit_exit(); 1628 } else if (new_flags & IFF_UP && 1629 (ifp->if_flags & IFF_UP) == 0) { 1630 crit_enter(); 1631 if_up(ifp); 1632 crit_exit(); 1633 } 1634 1635 #ifdef IFPOLL_ENABLE 1636 if ((new_flags ^ ifp->if_flags) & IFF_NPOLLING) { 1637 if (new_flags & IFF_NPOLLING) 1638 ifpoll_register(ifp); 1639 else 1640 ifpoll_deregister(ifp); 1641 } 1642 #endif 1643 1644 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1645 (new_flags &~ IFF_CANTCHANGE); 1646 if (new_flags & IFF_PPROMISC) { 1647 /* Permanently promiscuous mode requested */ 1648 ifp->if_flags |= IFF_PROMISC; 1649 } else if (ifp->if_pcount == 0) { 1650 ifp->if_flags &= ~IFF_PROMISC; 1651 } 1652 if (ifp->if_ioctl) { 1653 ifnet_serialize_all(ifp); 1654 ifp->if_ioctl(ifp, cmd, data, cred); 1655 ifnet_deserialize_all(ifp); 1656 } 1657 getmicrotime(&ifp->if_lastchange); 1658 break; 1659 1660 case SIOCSIFCAP: 1661 error = priv_check_cred(cred, PRIV_ROOT, 0); 1662 if (error) 1663 break; 1664 if (ifr->ifr_reqcap & ~ifp->if_capabilities) { 1665 error = EINVAL; 1666 break; 1667 } 1668 ifnet_serialize_all(ifp); 1669 ifp->if_ioctl(ifp, cmd, data, cred); 1670 ifnet_deserialize_all(ifp); 1671 break; 1672 1673 case SIOCSIFNAME: 1674 error = priv_check_cred(cred, PRIV_ROOT, 0); 1675 if (error) 1676 break; 1677 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1678 if (error) 1679 break; 1680 if (new_name[0] == '\0') { 1681 error = EINVAL; 1682 break; 1683 } 1684 if (ifunit(new_name) != NULL) { 1685 error = EEXIST; 1686 break; 1687 } 1688 1689 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 1690 1691 /* Announce the departure of the interface. */ 1692 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1693 1694 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1695 ifa = TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa; 1696 /* XXX IFA_LOCK(ifa); */ 1697 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1698 namelen = strlen(new_name); 1699 onamelen = sdl->sdl_nlen; 1700 /* 1701 * Move the address if needed. This is safe because we 1702 * allocate space for a name of length IFNAMSIZ when we 1703 * create this in if_attach(). 1704 */ 1705 if (namelen != onamelen) { 1706 bcopy(sdl->sdl_data + onamelen, 1707 sdl->sdl_data + namelen, sdl->sdl_alen); 1708 } 1709 bcopy(new_name, sdl->sdl_data, namelen); 1710 sdl->sdl_nlen = namelen; 1711 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1712 bzero(sdl->sdl_data, onamelen); 1713 while (namelen != 0) 1714 sdl->sdl_data[--namelen] = 0xff; 1715 /* XXX IFA_UNLOCK(ifa) */ 1716 1717 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 1718 1719 /* Announce the return of the interface. */ 1720 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1721 break; 1722 1723 case SIOCSIFMETRIC: 1724 error = priv_check_cred(cred, PRIV_ROOT, 0); 1725 if (error) 1726 break; 1727 ifp->if_metric = ifr->ifr_metric; 1728 getmicrotime(&ifp->if_lastchange); 1729 break; 1730 1731 case SIOCSIFPHYS: 1732 error = priv_check_cred(cred, PRIV_ROOT, 0); 1733 if (error) 1734 break; 1735 if (ifp->if_ioctl == NULL) { 1736 error = EOPNOTSUPP; 1737 break; 1738 } 1739 ifnet_serialize_all(ifp); 1740 error = ifp->if_ioctl(ifp, cmd, data, cred); 1741 ifnet_deserialize_all(ifp); 1742 if (error == 0) 1743 getmicrotime(&ifp->if_lastchange); 1744 break; 1745 1746 case SIOCSIFMTU: 1747 { 1748 u_long oldmtu = ifp->if_mtu; 1749 1750 error = priv_check_cred(cred, PRIV_ROOT, 0); 1751 if (error) 1752 break; 1753 if (ifp->if_ioctl == NULL) { 1754 error = EOPNOTSUPP; 1755 break; 1756 } 1757 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) { 1758 error = EINVAL; 1759 break; 1760 } 1761 ifnet_serialize_all(ifp); 1762 error = ifp->if_ioctl(ifp, cmd, data, cred); 1763 ifnet_deserialize_all(ifp); 1764 if (error == 0) { 1765 getmicrotime(&ifp->if_lastchange); 1766 rt_ifmsg(ifp); 1767 } 1768 /* 1769 * If the link MTU changed, do network layer specific procedure. 1770 */ 1771 if (ifp->if_mtu != oldmtu) { 1772 #ifdef INET6 1773 nd6_setmtu(ifp); 1774 #endif 1775 } 1776 break; 1777 } 1778 1779 case SIOCSIFTSOLEN: 1780 error = priv_check_cred(cred, PRIV_ROOT, 0); 1781 if (error) 1782 break; 1783 1784 /* XXX need driver supplied upper limit */ 1785 if (ifr->ifr_tsolen <= 0) { 1786 error = EINVAL; 1787 break; 1788 } 1789 ifp->if_tsolen = ifr->ifr_tsolen; 1790 break; 1791 1792 case SIOCADDMULTI: 1793 case SIOCDELMULTI: 1794 error = priv_check_cred(cred, PRIV_ROOT, 0); 1795 if (error) 1796 break; 1797 1798 /* Don't allow group membership on non-multicast interfaces. */ 1799 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1800 error = EOPNOTSUPP; 1801 break; 1802 } 1803 1804 /* Don't let users screw up protocols' entries. */ 1805 if (ifr->ifr_addr.sa_family != AF_LINK) { 1806 error = EINVAL; 1807 break; 1808 } 1809 1810 if (cmd == SIOCADDMULTI) { 1811 struct ifmultiaddr *ifma; 1812 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1813 } else { 1814 error = if_delmulti(ifp, &ifr->ifr_addr); 1815 } 1816 if (error == 0) 1817 getmicrotime(&ifp->if_lastchange); 1818 break; 1819 1820 case SIOCSIFPHYADDR: 1821 case SIOCDIFPHYADDR: 1822 #ifdef INET6 1823 case SIOCSIFPHYADDR_IN6: 1824 #endif 1825 case SIOCSLIFPHYADDR: 1826 case SIOCSIFMEDIA: 1827 case SIOCSIFGENERIC: 1828 error = priv_check_cred(cred, PRIV_ROOT, 0); 1829 if (error) 1830 break; 1831 if (ifp->if_ioctl == 0) { 1832 error = EOPNOTSUPP; 1833 break; 1834 } 1835 ifnet_serialize_all(ifp); 1836 error = ifp->if_ioctl(ifp, cmd, data, cred); 1837 ifnet_deserialize_all(ifp); 1838 if (error == 0) 1839 getmicrotime(&ifp->if_lastchange); 1840 break; 1841 1842 case SIOCGIFSTATUS: 1843 ifs = (struct ifstat *)data; 1844 ifs->ascii[0] = '\0'; 1845 /* fall through */ 1846 case SIOCGIFPSRCADDR: 1847 case SIOCGIFPDSTADDR: 1848 case SIOCGLIFPHYADDR: 1849 case SIOCGIFMEDIA: 1850 case SIOCGIFGENERIC: 1851 if (ifp->if_ioctl == NULL) { 1852 error = EOPNOTSUPP; 1853 break; 1854 } 1855 ifnet_serialize_all(ifp); 1856 error = ifp->if_ioctl(ifp, cmd, data, cred); 1857 ifnet_deserialize_all(ifp); 1858 break; 1859 1860 case SIOCSIFLLADDR: 1861 error = priv_check_cred(cred, PRIV_ROOT, 0); 1862 if (error) 1863 break; 1864 error = if_setlladdr(ifp, ifr->ifr_addr.sa_data, 1865 ifr->ifr_addr.sa_len); 1866 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 1867 break; 1868 1869 default: 1870 oif_flags = ifp->if_flags; 1871 if (so->so_proto == 0) { 1872 error = EOPNOTSUPP; 1873 break; 1874 } 1875 #ifndef COMPAT_43 1876 error = so_pru_control_direct(so, cmd, data, ifp); 1877 #else 1878 ocmd = cmd; 1879 1880 switch (cmd) { 1881 case SIOCSIFDSTADDR: 1882 case SIOCSIFADDR: 1883 case SIOCSIFBRDADDR: 1884 case SIOCSIFNETMASK: 1885 #if BYTE_ORDER != BIG_ENDIAN 1886 if (ifr->ifr_addr.sa_family == 0 && 1887 ifr->ifr_addr.sa_len < 16) { 1888 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1889 ifr->ifr_addr.sa_len = 16; 1890 } 1891 #else 1892 if (ifr->ifr_addr.sa_len == 0) 1893 ifr->ifr_addr.sa_len = 16; 1894 #endif 1895 break; 1896 case OSIOCGIFADDR: 1897 cmd = SIOCGIFADDR; 1898 break; 1899 case OSIOCGIFDSTADDR: 1900 cmd = SIOCGIFDSTADDR; 1901 break; 1902 case OSIOCGIFBRDADDR: 1903 cmd = SIOCGIFBRDADDR; 1904 break; 1905 case OSIOCGIFNETMASK: 1906 cmd = SIOCGIFNETMASK; 1907 break; 1908 default: 1909 break; 1910 } 1911 1912 error = so_pru_control_direct(so, cmd, data, ifp); 1913 1914 switch (ocmd) { 1915 case OSIOCGIFADDR: 1916 case OSIOCGIFDSTADDR: 1917 case OSIOCGIFBRDADDR: 1918 case OSIOCGIFNETMASK: 1919 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1920 break; 1921 } 1922 #endif /* COMPAT_43 */ 1923 1924 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1925 #ifdef INET6 1926 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1927 if (ifp->if_flags & IFF_UP) { 1928 crit_enter(); 1929 in6_if_up(ifp); 1930 crit_exit(); 1931 } 1932 #endif 1933 } 1934 break; 1935 } 1936 1937 mtx_unlock(&ifp->if_ioctl_mtx); 1938 return (error); 1939 } 1940 1941 /* 1942 * Set/clear promiscuous mode on interface ifp based on the truth value 1943 * of pswitch. The calls are reference counted so that only the first 1944 * "on" request actually has an effect, as does the final "off" request. 1945 * Results are undefined if the "off" and "on" requests are not matched. 1946 */ 1947 int 1948 ifpromisc(struct ifnet *ifp, int pswitch) 1949 { 1950 struct ifreq ifr; 1951 int error; 1952 int oldflags; 1953 1954 oldflags = ifp->if_flags; 1955 if (ifp->if_flags & IFF_PPROMISC) { 1956 /* Do nothing if device is in permanently promiscuous mode */ 1957 ifp->if_pcount += pswitch ? 1 : -1; 1958 return (0); 1959 } 1960 if (pswitch) { 1961 /* 1962 * If the device is not configured up, we cannot put it in 1963 * promiscuous mode. 1964 */ 1965 if ((ifp->if_flags & IFF_UP) == 0) 1966 return (ENETDOWN); 1967 if (ifp->if_pcount++ != 0) 1968 return (0); 1969 ifp->if_flags |= IFF_PROMISC; 1970 log(LOG_INFO, "%s: promiscuous mode enabled\n", 1971 ifp->if_xname); 1972 } else { 1973 if (--ifp->if_pcount > 0) 1974 return (0); 1975 ifp->if_flags &= ~IFF_PROMISC; 1976 log(LOG_INFO, "%s: promiscuous mode disabled\n", 1977 ifp->if_xname); 1978 } 1979 ifr.ifr_flags = ifp->if_flags; 1980 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1981 ifnet_serialize_all(ifp); 1982 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, NULL); 1983 ifnet_deserialize_all(ifp); 1984 if (error == 0) 1985 rt_ifmsg(ifp); 1986 else 1987 ifp->if_flags = oldflags; 1988 return error; 1989 } 1990 1991 /* 1992 * Return interface configuration 1993 * of system. List may be used 1994 * in later ioctl's (above) to get 1995 * other information. 1996 */ 1997 static int 1998 ifconf(u_long cmd, caddr_t data, struct ucred *cred) 1999 { 2000 struct ifconf *ifc = (struct ifconf *)data; 2001 struct ifnet *ifp; 2002 struct sockaddr *sa; 2003 struct ifreq ifr, *ifrp; 2004 int space = ifc->ifc_len, error = 0; 2005 2006 ifrp = ifc->ifc_req; 2007 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2008 struct ifaddr_container *ifac; 2009 int addrs; 2010 2011 if (space <= sizeof ifr) 2012 break; 2013 2014 /* 2015 * Zero the stack declared structure first to prevent 2016 * memory disclosure. 2017 */ 2018 bzero(&ifr, sizeof(ifr)); 2019 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2020 >= sizeof(ifr.ifr_name)) { 2021 error = ENAMETOOLONG; 2022 break; 2023 } 2024 2025 addrs = 0; 2026 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2027 struct ifaddr *ifa = ifac->ifa; 2028 2029 if (space <= sizeof ifr) 2030 break; 2031 sa = ifa->ifa_addr; 2032 if (cred->cr_prison && 2033 prison_if(cred, sa)) 2034 continue; 2035 addrs++; 2036 #ifdef COMPAT_43 2037 if (cmd == OSIOCGIFCONF) { 2038 struct osockaddr *osa = 2039 (struct osockaddr *)&ifr.ifr_addr; 2040 ifr.ifr_addr = *sa; 2041 osa->sa_family = sa->sa_family; 2042 error = copyout(&ifr, ifrp, sizeof ifr); 2043 ifrp++; 2044 } else 2045 #endif 2046 if (sa->sa_len <= sizeof(*sa)) { 2047 ifr.ifr_addr = *sa; 2048 error = copyout(&ifr, ifrp, sizeof ifr); 2049 ifrp++; 2050 } else { 2051 if (space < (sizeof ifr) + sa->sa_len - 2052 sizeof(*sa)) 2053 break; 2054 space -= sa->sa_len - sizeof(*sa); 2055 error = copyout(&ifr, ifrp, 2056 sizeof ifr.ifr_name); 2057 if (error == 0) 2058 error = copyout(sa, &ifrp->ifr_addr, 2059 sa->sa_len); 2060 ifrp = (struct ifreq *) 2061 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 2062 } 2063 if (error) 2064 break; 2065 space -= sizeof ifr; 2066 } 2067 if (error) 2068 break; 2069 if (!addrs) { 2070 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr); 2071 error = copyout(&ifr, ifrp, sizeof ifr); 2072 if (error) 2073 break; 2074 space -= sizeof ifr; 2075 ifrp++; 2076 } 2077 } 2078 ifc->ifc_len -= space; 2079 return (error); 2080 } 2081 2082 /* 2083 * Just like if_promisc(), but for all-multicast-reception mode. 2084 */ 2085 int 2086 if_allmulti(struct ifnet *ifp, int onswitch) 2087 { 2088 int error = 0; 2089 struct ifreq ifr; 2090 2091 crit_enter(); 2092 2093 if (onswitch) { 2094 if (ifp->if_amcount++ == 0) { 2095 ifp->if_flags |= IFF_ALLMULTI; 2096 ifr.ifr_flags = ifp->if_flags; 2097 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2098 ifnet_serialize_all(ifp); 2099 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 2100 NULL); 2101 ifnet_deserialize_all(ifp); 2102 } 2103 } else { 2104 if (ifp->if_amcount > 1) { 2105 ifp->if_amcount--; 2106 } else { 2107 ifp->if_amcount = 0; 2108 ifp->if_flags &= ~IFF_ALLMULTI; 2109 ifr.ifr_flags = ifp->if_flags; 2110 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2111 ifnet_serialize_all(ifp); 2112 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 2113 NULL); 2114 ifnet_deserialize_all(ifp); 2115 } 2116 } 2117 2118 crit_exit(); 2119 2120 if (error == 0) 2121 rt_ifmsg(ifp); 2122 return error; 2123 } 2124 2125 /* 2126 * Add a multicast listenership to the interface in question. 2127 * The link layer provides a routine which converts 2128 */ 2129 int 2130 if_addmulti( 2131 struct ifnet *ifp, /* interface to manipulate */ 2132 struct sockaddr *sa, /* address to add */ 2133 struct ifmultiaddr **retifma) 2134 { 2135 struct sockaddr *llsa, *dupsa; 2136 int error; 2137 struct ifmultiaddr *ifma; 2138 2139 /* 2140 * If the matching multicast address already exists 2141 * then don't add a new one, just add a reference 2142 */ 2143 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2144 if (sa_equal(sa, ifma->ifma_addr)) { 2145 ifma->ifma_refcount++; 2146 if (retifma) 2147 *retifma = ifma; 2148 return 0; 2149 } 2150 } 2151 2152 /* 2153 * Give the link layer a chance to accept/reject it, and also 2154 * find out which AF_LINK address this maps to, if it isn't one 2155 * already. 2156 */ 2157 if (ifp->if_resolvemulti) { 2158 ifnet_serialize_all(ifp); 2159 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2160 ifnet_deserialize_all(ifp); 2161 if (error) 2162 return error; 2163 } else { 2164 llsa = NULL; 2165 } 2166 2167 ifma = kmalloc(sizeof *ifma, M_IFMADDR, M_WAITOK); 2168 dupsa = kmalloc(sa->sa_len, M_IFMADDR, M_WAITOK); 2169 bcopy(sa, dupsa, sa->sa_len); 2170 2171 ifma->ifma_addr = dupsa; 2172 ifma->ifma_lladdr = llsa; 2173 ifma->ifma_ifp = ifp; 2174 ifma->ifma_refcount = 1; 2175 ifma->ifma_protospec = 0; 2176 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2177 2178 /* 2179 * Some network interfaces can scan the address list at 2180 * interrupt time; lock them out. 2181 */ 2182 crit_enter(); 2183 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2184 crit_exit(); 2185 if (retifma) 2186 *retifma = ifma; 2187 2188 if (llsa != NULL) { 2189 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2190 if (sa_equal(ifma->ifma_addr, llsa)) 2191 break; 2192 } 2193 if (ifma) { 2194 ifma->ifma_refcount++; 2195 } else { 2196 ifma = kmalloc(sizeof *ifma, M_IFMADDR, M_WAITOK); 2197 dupsa = kmalloc(llsa->sa_len, M_IFMADDR, M_WAITOK); 2198 bcopy(llsa, dupsa, llsa->sa_len); 2199 ifma->ifma_addr = dupsa; 2200 ifma->ifma_ifp = ifp; 2201 ifma->ifma_refcount = 1; 2202 crit_enter(); 2203 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2204 crit_exit(); 2205 } 2206 } 2207 /* 2208 * We are certain we have added something, so call down to the 2209 * interface to let them know about it. 2210 */ 2211 crit_enter(); 2212 ifnet_serialize_all(ifp); 2213 if (ifp->if_ioctl) 2214 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, NULL); 2215 ifnet_deserialize_all(ifp); 2216 crit_exit(); 2217 2218 return 0; 2219 } 2220 2221 /* 2222 * Remove a reference to a multicast address on this interface. Yell 2223 * if the request does not match an existing membership. 2224 */ 2225 int 2226 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 2227 { 2228 struct ifmultiaddr *ifma; 2229 2230 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 2231 if (sa_equal(sa, ifma->ifma_addr)) 2232 break; 2233 if (ifma == NULL) 2234 return ENOENT; 2235 2236 if (ifma->ifma_refcount > 1) { 2237 ifma->ifma_refcount--; 2238 return 0; 2239 } 2240 2241 rt_newmaddrmsg(RTM_DELMADDR, ifma); 2242 sa = ifma->ifma_lladdr; 2243 crit_enter(); 2244 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2245 /* 2246 * Make sure the interface driver is notified 2247 * in the case of a link layer mcast group being left. 2248 */ 2249 if (ifma->ifma_addr->sa_family == AF_LINK && sa == NULL) { 2250 ifnet_serialize_all(ifp); 2251 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, NULL); 2252 ifnet_deserialize_all(ifp); 2253 } 2254 crit_exit(); 2255 kfree(ifma->ifma_addr, M_IFMADDR); 2256 kfree(ifma, M_IFMADDR); 2257 if (sa == NULL) 2258 return 0; 2259 2260 /* 2261 * Now look for the link-layer address which corresponds to 2262 * this network address. It had been squirreled away in 2263 * ifma->ifma_lladdr for this purpose (so we don't have 2264 * to call ifp->if_resolvemulti() again), and we saved that 2265 * value in sa above. If some nasty deleted the 2266 * link-layer address out from underneath us, we can deal because 2267 * the address we stored was is not the same as the one which was 2268 * in the record for the link-layer address. (So we don't complain 2269 * in that case.) 2270 */ 2271 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 2272 if (sa_equal(sa, ifma->ifma_addr)) 2273 break; 2274 if (ifma == NULL) 2275 return 0; 2276 2277 if (ifma->ifma_refcount > 1) { 2278 ifma->ifma_refcount--; 2279 return 0; 2280 } 2281 2282 crit_enter(); 2283 ifnet_serialize_all(ifp); 2284 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 2285 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, NULL); 2286 ifnet_deserialize_all(ifp); 2287 crit_exit(); 2288 kfree(ifma->ifma_addr, M_IFMADDR); 2289 kfree(sa, M_IFMADDR); 2290 kfree(ifma, M_IFMADDR); 2291 2292 return 0; 2293 } 2294 2295 /* 2296 * Delete all multicast group membership for an interface. 2297 * Should be used to quickly flush all multicast filters. 2298 */ 2299 void 2300 if_delallmulti(struct ifnet *ifp) 2301 { 2302 struct ifmultiaddr *ifma; 2303 struct ifmultiaddr *next; 2304 2305 TAILQ_FOREACH_MUTABLE(ifma, &ifp->if_multiaddrs, ifma_link, next) 2306 if_delmulti(ifp, ifma->ifma_addr); 2307 } 2308 2309 2310 /* 2311 * Set the link layer address on an interface. 2312 * 2313 * At this time we only support certain types of interfaces, 2314 * and we don't allow the length of the address to change. 2315 */ 2316 int 2317 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 2318 { 2319 struct sockaddr_dl *sdl; 2320 struct ifreq ifr; 2321 2322 sdl = IF_LLSOCKADDR(ifp); 2323 if (sdl == NULL) 2324 return (EINVAL); 2325 if (len != sdl->sdl_alen) /* don't allow length to change */ 2326 return (EINVAL); 2327 switch (ifp->if_type) { 2328 case IFT_ETHER: /* these types use struct arpcom */ 2329 case IFT_XETHER: 2330 case IFT_L2VLAN: 2331 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 2332 bcopy(lladdr, LLADDR(sdl), len); 2333 break; 2334 default: 2335 return (ENODEV); 2336 } 2337 /* 2338 * If the interface is already up, we need 2339 * to re-init it in order to reprogram its 2340 * address filter. 2341 */ 2342 ifnet_serialize_all(ifp); 2343 if ((ifp->if_flags & IFF_UP) != 0) { 2344 #ifdef INET 2345 struct ifaddr_container *ifac; 2346 #endif 2347 2348 ifp->if_flags &= ~IFF_UP; 2349 ifr.ifr_flags = ifp->if_flags; 2350 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2351 ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 2352 NULL); 2353 ifp->if_flags |= IFF_UP; 2354 ifr.ifr_flags = ifp->if_flags; 2355 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2356 ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 2357 NULL); 2358 #ifdef INET 2359 /* 2360 * Also send gratuitous ARPs to notify other nodes about 2361 * the address change. 2362 */ 2363 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2364 struct ifaddr *ifa = ifac->ifa; 2365 2366 if (ifa->ifa_addr != NULL && 2367 ifa->ifa_addr->sa_family == AF_INET) 2368 arp_gratuitous(ifp, ifa); 2369 } 2370 #endif 2371 } 2372 ifnet_deserialize_all(ifp); 2373 return (0); 2374 } 2375 2376 struct ifmultiaddr * 2377 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 2378 { 2379 struct ifmultiaddr *ifma; 2380 2381 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 2382 if (sa_equal(ifma->ifma_addr, sa)) 2383 break; 2384 2385 return ifma; 2386 } 2387 2388 /* 2389 * This function locates the first real ethernet MAC from a network 2390 * card and loads it into node, returning 0 on success or ENOENT if 2391 * no suitable interfaces were found. It is used by the uuid code to 2392 * generate a unique 6-byte number. 2393 */ 2394 int 2395 if_getanyethermac(uint16_t *node, int minlen) 2396 { 2397 struct ifnet *ifp; 2398 struct sockaddr_dl *sdl; 2399 2400 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2401 if (ifp->if_type != IFT_ETHER) 2402 continue; 2403 sdl = IF_LLSOCKADDR(ifp); 2404 if (sdl->sdl_alen < minlen) 2405 continue; 2406 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr, node, 2407 minlen); 2408 return(0); 2409 } 2410 return (ENOENT); 2411 } 2412 2413 /* 2414 * The name argument must be a pointer to storage which will last as 2415 * long as the interface does. For physical devices, the result of 2416 * device_get_name(dev) is a good choice and for pseudo-devices a 2417 * static string works well. 2418 */ 2419 void 2420 if_initname(struct ifnet *ifp, const char *name, int unit) 2421 { 2422 ifp->if_dname = name; 2423 ifp->if_dunit = unit; 2424 if (unit != IF_DUNIT_NONE) 2425 ksnprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2426 else 2427 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2428 } 2429 2430 int 2431 if_printf(struct ifnet *ifp, const char *fmt, ...) 2432 { 2433 __va_list ap; 2434 int retval; 2435 2436 retval = kprintf("%s: ", ifp->if_xname); 2437 __va_start(ap, fmt); 2438 retval += kvprintf(fmt, ap); 2439 __va_end(ap); 2440 return (retval); 2441 } 2442 2443 struct ifnet * 2444 if_alloc(uint8_t type) 2445 { 2446 struct ifnet *ifp; 2447 size_t size; 2448 2449 /* 2450 * XXX temporary hack until arpcom is setup in if_l2com 2451 */ 2452 if (type == IFT_ETHER) 2453 size = sizeof(struct arpcom); 2454 else 2455 size = sizeof(struct ifnet); 2456 2457 ifp = kmalloc(size, M_IFNET, M_WAITOK|M_ZERO); 2458 2459 ifp->if_type = type; 2460 2461 if (if_com_alloc[type] != NULL) { 2462 ifp->if_l2com = if_com_alloc[type](type, ifp); 2463 if (ifp->if_l2com == NULL) { 2464 kfree(ifp, M_IFNET); 2465 return (NULL); 2466 } 2467 } 2468 return (ifp); 2469 } 2470 2471 void 2472 if_free(struct ifnet *ifp) 2473 { 2474 kfree(ifp, M_IFNET); 2475 } 2476 2477 void 2478 ifq_set_classic(struct ifaltq *ifq) 2479 { 2480 ifq_set_methods(ifq, ifq->altq_ifp->if_mapsubq, 2481 ifsq_classic_enqueue, ifsq_classic_dequeue, ifsq_classic_request); 2482 } 2483 2484 void 2485 ifq_set_methods(struct ifaltq *ifq, altq_mapsubq_t mapsubq, 2486 ifsq_enqueue_t enqueue, ifsq_dequeue_t dequeue, ifsq_request_t request) 2487 { 2488 int q; 2489 2490 KASSERT(mapsubq != NULL, ("mapsubq is not specified")); 2491 KASSERT(enqueue != NULL, ("enqueue is not specified")); 2492 KASSERT(dequeue != NULL, ("dequeue is not specified")); 2493 KASSERT(request != NULL, ("request is not specified")); 2494 2495 ifq->altq_mapsubq = mapsubq; 2496 for (q = 0; q < ifq->altq_subq_cnt; ++q) { 2497 struct ifaltq_subque *ifsq = &ifq->altq_subq[q]; 2498 2499 ifsq->ifsq_enqueue = enqueue; 2500 ifsq->ifsq_dequeue = dequeue; 2501 ifsq->ifsq_request = request; 2502 } 2503 } 2504 2505 int 2506 ifsq_classic_enqueue(struct ifaltq_subque *ifsq, struct mbuf *m, 2507 struct altq_pktattr *pa __unused) 2508 { 2509 if (IF_QFULL(ifsq)) { 2510 m_freem(m); 2511 return(ENOBUFS); 2512 } else { 2513 IF_ENQUEUE(ifsq, m); 2514 return(0); 2515 } 2516 } 2517 2518 struct mbuf * 2519 ifsq_classic_dequeue(struct ifaltq_subque *ifsq, struct mbuf *mpolled, int op) 2520 { 2521 struct mbuf *m; 2522 2523 switch (op) { 2524 case ALTDQ_POLL: 2525 IF_POLL(ifsq, m); 2526 break; 2527 case ALTDQ_REMOVE: 2528 IF_DEQUEUE(ifsq, m); 2529 break; 2530 default: 2531 panic("unsupported ALTQ dequeue op: %d", op); 2532 } 2533 KKASSERT(mpolled == NULL || mpolled == m); 2534 return(m); 2535 } 2536 2537 int 2538 ifsq_classic_request(struct ifaltq_subque *ifsq, int req, void *arg) 2539 { 2540 switch (req) { 2541 case ALTRQ_PURGE: 2542 IF_DRAIN(ifsq); 2543 break; 2544 default: 2545 panic("unsupported ALTQ request: %d", req); 2546 } 2547 return(0); 2548 } 2549 2550 static void 2551 ifsq_ifstart_try(struct ifaltq_subque *ifsq, int force_sched) 2552 { 2553 struct ifnet *ifp = ifsq_get_ifp(ifsq); 2554 int running = 0, need_sched; 2555 2556 /* 2557 * Try to do direct ifnet.if_start first, if there is 2558 * contention on ifnet's serializer, ifnet.if_start will 2559 * be scheduled on ifnet's CPU. 2560 */ 2561 if (!ifsq_tryserialize_hw(ifsq)) { 2562 /* 2563 * ifnet serializer contention happened, 2564 * ifnet.if_start is scheduled on ifnet's 2565 * CPU, and we keep going. 2566 */ 2567 ifsq_ifstart_schedule(ifsq, 1); 2568 return; 2569 } 2570 2571 if ((ifp->if_flags & IFF_RUNNING) && !ifsq_is_oactive(ifsq)) { 2572 ifp->if_start(ifp, ifsq); 2573 if ((ifp->if_flags & IFF_RUNNING) && !ifsq_is_oactive(ifsq)) 2574 running = 1; 2575 } 2576 need_sched = ifsq_ifstart_need_schedule(ifsq, running); 2577 2578 ifsq_deserialize_hw(ifsq); 2579 2580 if (need_sched) { 2581 /* 2582 * More data need to be transmitted, ifnet.if_start is 2583 * scheduled on ifnet's CPU, and we keep going. 2584 * NOTE: ifnet.if_start interlock is not released. 2585 */ 2586 ifsq_ifstart_schedule(ifsq, force_sched); 2587 } 2588 } 2589 2590 /* 2591 * IFSUBQ packets staging mechanism: 2592 * 2593 * The packets enqueued into IFSUBQ are staged to a certain amount before the 2594 * ifnet's if_start is called. In this way, the driver could avoid writing 2595 * to hardware registers upon every packet, instead, hardware registers 2596 * could be written when certain amount of packets are put onto hardware 2597 * TX ring. The measurement on several modern NICs (emx(4), igb(4), bnx(4), 2598 * bge(4), jme(4)) shows that the hardware registers writing aggregation 2599 * could save ~20% CPU time when 18bytes UDP datagrams are transmitted at 2600 * 1.48Mpps. The performance improvement by hardware registers writing 2601 * aggeregation is also mentioned by Luigi Rizzo's netmap paper 2602 * (http://info.iet.unipi.it/~luigi/netmap/). 2603 * 2604 * IFSUBQ packets staging is performed for two entry points into drivers's 2605 * transmission function: 2606 * - Direct ifnet's if_start calling, i.e. ifsq_ifstart_try() 2607 * - ifnet's if_start scheduling, i.e. ifsq_ifstart_schedule() 2608 * 2609 * IFSUBQ packets staging will be stopped upon any of the following conditions: 2610 * - If the count of packets enqueued on the current CPU is great than or 2611 * equal to ifsq_stage_cntmax. (XXX this should be per-interface) 2612 * - If the total length of packets enqueued on the current CPU is great 2613 * than or equal to the hardware's MTU - max_protohdr. max_protohdr is 2614 * cut from the hardware's MTU mainly bacause a full TCP segment's size 2615 * is usually less than hardware's MTU. 2616 * - ifsq_ifstart_schedule() is not pending on the current CPU and if_start 2617 * interlock (if_snd.altq_started) is not released. 2618 * - The if_start_rollup(), which is registered as low priority netisr 2619 * rollup function, is called; probably because no more work is pending 2620 * for netisr. 2621 * 2622 * NOTE: 2623 * Currently IFSUBQ packet staging is only performed in netisr threads. 2624 */ 2625 int 2626 ifq_dispatch(struct ifnet *ifp, struct mbuf *m, struct altq_pktattr *pa) 2627 { 2628 struct ifaltq *ifq = &ifp->if_snd; 2629 struct ifaltq_subque *ifsq; 2630 int error, start = 0, len, mcast = 0, avoid_start = 0; 2631 struct ifsubq_stage_head *head = NULL; 2632 struct ifsubq_stage *stage = NULL; 2633 2634 ifsq = ifq_map_subq(ifq, mycpuid); 2635 ASSERT_ALTQ_SQ_NOT_SERIALIZED_HW(ifsq); 2636 2637 len = m->m_pkthdr.len; 2638 if (m->m_flags & M_MCAST) 2639 mcast = 1; 2640 2641 if (curthread->td_type == TD_TYPE_NETISR) { 2642 head = &ifsubq_stage_heads[mycpuid]; 2643 stage = ifsq_get_stage(ifsq, mycpuid); 2644 2645 stage->stg_cnt++; 2646 stage->stg_len += len; 2647 if (stage->stg_cnt < ifsq_stage_cntmax && 2648 stage->stg_len < (ifp->if_mtu - max_protohdr)) 2649 avoid_start = 1; 2650 } 2651 2652 ALTQ_SQ_LOCK(ifsq); 2653 error = ifsq_enqueue_locked(ifsq, m, pa); 2654 if (error) { 2655 if (!ifsq_data_ready(ifsq)) { 2656 ALTQ_SQ_UNLOCK(ifsq); 2657 return error; 2658 } 2659 avoid_start = 0; 2660 } 2661 if (!ifsq_is_started(ifsq)) { 2662 if (avoid_start) { 2663 ALTQ_SQ_UNLOCK(ifsq); 2664 2665 KKASSERT(!error); 2666 if ((stage->stg_flags & IFSQ_STAGE_FLAG_QUED) == 0) 2667 ifsq_stage_insert(head, stage); 2668 2669 IFNET_STAT_INC(ifp, obytes, len); 2670 if (mcast) 2671 IFNET_STAT_INC(ifp, omcasts, 1); 2672 return error; 2673 } 2674 2675 /* 2676 * Hold the interlock of ifnet.if_start 2677 */ 2678 ifsq_set_started(ifsq); 2679 start = 1; 2680 } 2681 ALTQ_SQ_UNLOCK(ifsq); 2682 2683 if (!error) { 2684 IFNET_STAT_INC(ifp, obytes, len); 2685 if (mcast) 2686 IFNET_STAT_INC(ifp, omcasts, 1); 2687 } 2688 2689 if (stage != NULL) { 2690 if (!start && (stage->stg_flags & IFSQ_STAGE_FLAG_SCHED)) { 2691 KKASSERT(stage->stg_flags & IFSQ_STAGE_FLAG_QUED); 2692 if (!avoid_start) { 2693 ifsq_stage_remove(head, stage); 2694 ifsq_ifstart_schedule(ifsq, 1); 2695 } 2696 return error; 2697 } 2698 2699 if (stage->stg_flags & IFSQ_STAGE_FLAG_QUED) { 2700 ifsq_stage_remove(head, stage); 2701 } else { 2702 stage->stg_cnt = 0; 2703 stage->stg_len = 0; 2704 } 2705 } 2706 2707 if (!start) 2708 return error; 2709 2710 ifsq_ifstart_try(ifsq, 0); 2711 return error; 2712 } 2713 2714 void * 2715 ifa_create(int size, int flags) 2716 { 2717 struct ifaddr *ifa; 2718 int i; 2719 2720 KASSERT(size >= sizeof(*ifa), ("ifaddr size too small")); 2721 2722 ifa = kmalloc(size, M_IFADDR, flags | M_ZERO); 2723 if (ifa == NULL) 2724 return NULL; 2725 2726 ifa->ifa_containers = 2727 kmalloc_cachealign(ncpus * sizeof(struct ifaddr_container), 2728 M_IFADDR, M_WAITOK | M_ZERO); 2729 ifa->ifa_ncnt = ncpus; 2730 for (i = 0; i < ncpus; ++i) { 2731 struct ifaddr_container *ifac = &ifa->ifa_containers[i]; 2732 2733 ifac->ifa_magic = IFA_CONTAINER_MAGIC; 2734 ifac->ifa = ifa; 2735 ifac->ifa_refcnt = 1; 2736 } 2737 #ifdef IFADDR_DEBUG 2738 kprintf("alloc ifa %p %d\n", ifa, size); 2739 #endif 2740 return ifa; 2741 } 2742 2743 void 2744 ifac_free(struct ifaddr_container *ifac, int cpu_id) 2745 { 2746 struct ifaddr *ifa = ifac->ifa; 2747 2748 KKASSERT(ifac->ifa_magic == IFA_CONTAINER_MAGIC); 2749 KKASSERT(ifac->ifa_refcnt == 0); 2750 KASSERT(ifac->ifa_listmask == 0, 2751 ("ifa is still on %#x lists", ifac->ifa_listmask)); 2752 2753 ifac->ifa_magic = IFA_CONTAINER_DEAD; 2754 2755 #ifdef IFADDR_DEBUG_VERBOSE 2756 kprintf("try free ifa %p cpu_id %d\n", ifac->ifa, cpu_id); 2757 #endif 2758 2759 KASSERT(ifa->ifa_ncnt > 0 && ifa->ifa_ncnt <= ncpus, 2760 ("invalid # of ifac, %d", ifa->ifa_ncnt)); 2761 if (atomic_fetchadd_int(&ifa->ifa_ncnt, -1) == 1) { 2762 #ifdef IFADDR_DEBUG 2763 kprintf("free ifa %p\n", ifa); 2764 #endif 2765 kfree(ifa->ifa_containers, M_IFADDR); 2766 kfree(ifa, M_IFADDR); 2767 } 2768 } 2769 2770 static void 2771 ifa_iflink_dispatch(netmsg_t nmsg) 2772 { 2773 struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg; 2774 struct ifaddr *ifa = msg->ifa; 2775 struct ifnet *ifp = msg->ifp; 2776 int cpu = mycpuid; 2777 struct ifaddr_container *ifac; 2778 2779 crit_enter(); 2780 2781 ifac = &ifa->ifa_containers[cpu]; 2782 ASSERT_IFAC_VALID(ifac); 2783 KASSERT((ifac->ifa_listmask & IFA_LIST_IFADDRHEAD) == 0, 2784 ("ifaddr is on if_addrheads")); 2785 2786 ifac->ifa_listmask |= IFA_LIST_IFADDRHEAD; 2787 if (msg->tail) 2788 TAILQ_INSERT_TAIL(&ifp->if_addrheads[cpu], ifac, ifa_link); 2789 else 2790 TAILQ_INSERT_HEAD(&ifp->if_addrheads[cpu], ifac, ifa_link); 2791 2792 crit_exit(); 2793 2794 ifa_forwardmsg(&nmsg->lmsg, cpu + 1); 2795 } 2796 2797 void 2798 ifa_iflink(struct ifaddr *ifa, struct ifnet *ifp, int tail) 2799 { 2800 struct netmsg_ifaddr msg; 2801 2802 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 2803 0, ifa_iflink_dispatch); 2804 msg.ifa = ifa; 2805 msg.ifp = ifp; 2806 msg.tail = tail; 2807 2808 ifa_domsg(&msg.base.lmsg, 0); 2809 } 2810 2811 static void 2812 ifa_ifunlink_dispatch(netmsg_t nmsg) 2813 { 2814 struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg; 2815 struct ifaddr *ifa = msg->ifa; 2816 struct ifnet *ifp = msg->ifp; 2817 int cpu = mycpuid; 2818 struct ifaddr_container *ifac; 2819 2820 crit_enter(); 2821 2822 ifac = &ifa->ifa_containers[cpu]; 2823 ASSERT_IFAC_VALID(ifac); 2824 KASSERT(ifac->ifa_listmask & IFA_LIST_IFADDRHEAD, 2825 ("ifaddr is not on if_addrhead")); 2826 2827 TAILQ_REMOVE(&ifp->if_addrheads[cpu], ifac, ifa_link); 2828 ifac->ifa_listmask &= ~IFA_LIST_IFADDRHEAD; 2829 2830 crit_exit(); 2831 2832 ifa_forwardmsg(&nmsg->lmsg, cpu + 1); 2833 } 2834 2835 void 2836 ifa_ifunlink(struct ifaddr *ifa, struct ifnet *ifp) 2837 { 2838 struct netmsg_ifaddr msg; 2839 2840 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 2841 0, ifa_ifunlink_dispatch); 2842 msg.ifa = ifa; 2843 msg.ifp = ifp; 2844 2845 ifa_domsg(&msg.base.lmsg, 0); 2846 } 2847 2848 static void 2849 ifa_destroy_dispatch(netmsg_t nmsg) 2850 { 2851 struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg; 2852 2853 IFAFREE(msg->ifa); 2854 ifa_forwardmsg(&nmsg->lmsg, mycpuid + 1); 2855 } 2856 2857 void 2858 ifa_destroy(struct ifaddr *ifa) 2859 { 2860 struct netmsg_ifaddr msg; 2861 2862 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 2863 0, ifa_destroy_dispatch); 2864 msg.ifa = ifa; 2865 2866 ifa_domsg(&msg.base.lmsg, 0); 2867 } 2868 2869 struct lwkt_port * 2870 ifnet_portfn(int cpu) 2871 { 2872 return &ifnet_threads[cpu].td_msgport; 2873 } 2874 2875 void 2876 ifnet_forwardmsg(struct lwkt_msg *lmsg, int next_cpu) 2877 { 2878 KKASSERT(next_cpu > mycpuid && next_cpu <= ncpus); 2879 2880 if (next_cpu < ncpus) 2881 lwkt_forwardmsg(ifnet_portfn(next_cpu), lmsg); 2882 else 2883 lwkt_replymsg(lmsg, 0); 2884 } 2885 2886 int 2887 ifnet_domsg(struct lwkt_msg *lmsg, int cpu) 2888 { 2889 KKASSERT(cpu < ncpus); 2890 return lwkt_domsg(ifnet_portfn(cpu), lmsg, 0); 2891 } 2892 2893 void 2894 ifnet_sendmsg(struct lwkt_msg *lmsg, int cpu) 2895 { 2896 KKASSERT(cpu < ncpus); 2897 lwkt_sendmsg(ifnet_portfn(cpu), lmsg); 2898 } 2899 2900 /* 2901 * Generic netmsg service loop. Some protocols may roll their own but all 2902 * must do the basic command dispatch function call done here. 2903 */ 2904 static void 2905 ifnet_service_loop(void *arg __unused) 2906 { 2907 netmsg_t msg; 2908 2909 while ((msg = lwkt_waitport(&curthread->td_msgport, 0))) { 2910 KASSERT(msg->base.nm_dispatch, ("ifnet_service: badmsg")); 2911 msg->base.nm_dispatch(msg); 2912 } 2913 } 2914 2915 static void 2916 if_start_rollup(void) 2917 { 2918 struct ifsubq_stage_head *head = &ifsubq_stage_heads[mycpuid]; 2919 struct ifsubq_stage *stage; 2920 2921 while ((stage = TAILQ_FIRST(&head->stg_head)) != NULL) { 2922 struct ifaltq_subque *ifsq = stage->stg_subq; 2923 int is_sched = 0; 2924 2925 if (stage->stg_flags & IFSQ_STAGE_FLAG_SCHED) 2926 is_sched = 1; 2927 ifsq_stage_remove(head, stage); 2928 2929 if (is_sched) { 2930 ifsq_ifstart_schedule(ifsq, 1); 2931 } else { 2932 int start = 0; 2933 2934 ALTQ_SQ_LOCK(ifsq); 2935 if (!ifsq_is_started(ifsq)) { 2936 /* 2937 * Hold the interlock of ifnet.if_start 2938 */ 2939 ifsq_set_started(ifsq); 2940 start = 1; 2941 } 2942 ALTQ_SQ_UNLOCK(ifsq); 2943 2944 if (start) 2945 ifsq_ifstart_try(ifsq, 1); 2946 } 2947 KKASSERT((stage->stg_flags & 2948 (IFSQ_STAGE_FLAG_QUED | IFSQ_STAGE_FLAG_SCHED)) == 0); 2949 } 2950 } 2951 2952 static void 2953 ifnetinit(void *dummy __unused) 2954 { 2955 int i; 2956 2957 for (i = 0; i < ncpus; ++i) { 2958 struct thread *thr = &ifnet_threads[i]; 2959 2960 lwkt_create(ifnet_service_loop, NULL, NULL, 2961 thr, TDF_NOSTART|TDF_FORCE_SPINPORT, 2962 i, "ifnet %d", i); 2963 netmsg_service_port_init(&thr->td_msgport); 2964 lwkt_schedule(thr); 2965 } 2966 2967 for (i = 0; i < ncpus; ++i) 2968 TAILQ_INIT(&ifsubq_stage_heads[i].stg_head); 2969 netisr_register_rollup(if_start_rollup, NETISR_ROLLUP_PRIO_IFSTART); 2970 } 2971 2972 struct ifnet * 2973 ifnet_byindex(unsigned short idx) 2974 { 2975 if (idx > if_index) 2976 return NULL; 2977 return ifindex2ifnet[idx]; 2978 } 2979 2980 struct ifaddr * 2981 ifaddr_byindex(unsigned short idx) 2982 { 2983 struct ifnet *ifp; 2984 2985 ifp = ifnet_byindex(idx); 2986 if (!ifp) 2987 return NULL; 2988 return TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa; 2989 } 2990 2991 void 2992 if_register_com_alloc(u_char type, 2993 if_com_alloc_t *a, if_com_free_t *f) 2994 { 2995 2996 KASSERT(if_com_alloc[type] == NULL, 2997 ("if_register_com_alloc: %d already registered", type)); 2998 KASSERT(if_com_free[type] == NULL, 2999 ("if_register_com_alloc: %d free already registered", type)); 3000 3001 if_com_alloc[type] = a; 3002 if_com_free[type] = f; 3003 } 3004 3005 void 3006 if_deregister_com_alloc(u_char type) 3007 { 3008 3009 KASSERT(if_com_alloc[type] != NULL, 3010 ("if_deregister_com_alloc: %d not registered", type)); 3011 KASSERT(if_com_free[type] != NULL, 3012 ("if_deregister_com_alloc: %d free not registered", type)); 3013 if_com_alloc[type] = NULL; 3014 if_com_free[type] = NULL; 3015 } 3016 3017 int 3018 if_ring_count2(int cnt, int cnt_max) 3019 { 3020 int shift = 0; 3021 3022 KASSERT(cnt_max >= 1 && powerof2(cnt_max), 3023 ("invalid ring count max %d", cnt_max)); 3024 3025 if (cnt <= 0) 3026 cnt = cnt_max; 3027 if (cnt > ncpus2) 3028 cnt = ncpus2; 3029 if (cnt > cnt_max) 3030 cnt = cnt_max; 3031 3032 while ((1 << (shift + 1)) <= cnt) 3033 ++shift; 3034 cnt = 1 << shift; 3035 3036 KASSERT(cnt >= 1 && cnt <= ncpus2 && cnt <= cnt_max, 3037 ("calculate cnt %d, ncpus2 %d, cnt max %d", 3038 cnt, ncpus2, cnt_max)); 3039 return cnt; 3040 } 3041 3042 void 3043 ifq_set_maxlen(struct ifaltq *ifq, int len) 3044 { 3045 ifq->altq_maxlen = len + (ncpus * ifsq_stage_cntmax); 3046 } 3047 3048 int 3049 ifq_mapsubq_default(struct ifaltq *ifq __unused, int cpuid __unused) 3050 { 3051 return ALTQ_SUBQ_INDEX_DEFAULT; 3052 } 3053 3054 int 3055 ifq_mapsubq_mask(struct ifaltq *ifq, int cpuid) 3056 { 3057 return (cpuid & ifq->altq_subq_mask); 3058 } 3059 3060 static void 3061 ifsq_watchdog(void *arg) 3062 { 3063 struct ifsubq_watchdog *wd = arg; 3064 struct ifnet *ifp; 3065 3066 if (__predict_true(wd->wd_timer == 0 || --wd->wd_timer)) 3067 goto done; 3068 3069 ifp = ifsq_get_ifp(wd->wd_subq); 3070 if (ifnet_tryserialize_all(ifp)) { 3071 wd->wd_watchdog(wd->wd_subq); 3072 ifnet_deserialize_all(ifp); 3073 } else { 3074 /* try again next timeout */ 3075 wd->wd_timer = 1; 3076 } 3077 done: 3078 ifsq_watchdog_reset(wd); 3079 } 3080 3081 static void 3082 ifsq_watchdog_reset(struct ifsubq_watchdog *wd) 3083 { 3084 callout_reset_bycpu(&wd->wd_callout, hz, ifsq_watchdog, wd, 3085 ifsq_get_cpuid(wd->wd_subq)); 3086 } 3087 3088 void 3089 ifsq_watchdog_init(struct ifsubq_watchdog *wd, struct ifaltq_subque *ifsq, 3090 ifsq_watchdog_t watchdog) 3091 { 3092 callout_init_mp(&wd->wd_callout); 3093 wd->wd_timer = 0; 3094 wd->wd_subq = ifsq; 3095 wd->wd_watchdog = watchdog; 3096 } 3097 3098 void 3099 ifsq_watchdog_start(struct ifsubq_watchdog *wd) 3100 { 3101 wd->wd_timer = 0; 3102 ifsq_watchdog_reset(wd); 3103 } 3104 3105 void 3106 ifsq_watchdog_stop(struct ifsubq_watchdog *wd) 3107 { 3108 wd->wd_timer = 0; 3109 callout_stop(&wd->wd_callout); 3110 } 3111