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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if.c 8.3 (Berkeley) 1/4/94 34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $ 35 * $DragonFly: src/sys/net/if.c,v 1.84 2008/11/15 11:58:16 sephe Exp $ 36 */ 37 38 #include "opt_compat.h" 39 #include "opt_inet6.h" 40 #include "opt_inet.h" 41 #include "opt_polling.h" 42 #include "opt_ifpoll.h" 43 44 #include <sys/param.h> 45 #include <sys/malloc.h> 46 #include <sys/mbuf.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/priv.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/socketops.h> 54 #include <sys/protosw.h> 55 #include <sys/kernel.h> 56 #include <sys/ktr.h> 57 #include <sys/sockio.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/domain.h> 61 #include <sys/thread.h> 62 #include <sys/thread2.h> 63 #include <sys/serialize.h> 64 #include <sys/msgport2.h> 65 #include <sys/bus.h> 66 67 #include <net/if.h> 68 #include <net/if_arp.h> 69 #include <net/if_dl.h> 70 #include <net/if_types.h> 71 #include <net/if_var.h> 72 #include <net/ifq_var.h> 73 #include <net/radix.h> 74 #include <net/route.h> 75 #include <net/if_clone.h> 76 #include <net/netisr.h> 77 #include <net/netmsg2.h> 78 79 #include <machine/atomic.h> 80 #include <machine/stdarg.h> 81 #include <machine/smp.h> 82 83 #if defined(INET) || defined(INET6) 84 /*XXX*/ 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet/if_ether.h> 88 #ifdef INET6 89 #include <netinet6/in6_var.h> 90 #include <netinet6/in6_ifattach.h> 91 #endif 92 #endif 93 94 #if defined(COMPAT_43) 95 #include <emulation/43bsd/43bsd_socket.h> 96 #endif /* COMPAT_43 */ 97 98 struct netmsg_ifaddr { 99 struct netmsg netmsg; 100 struct ifaddr *ifa; 101 struct ifnet *ifp; 102 int tail; 103 }; 104 105 /* 106 * System initialization 107 */ 108 static void if_attachdomain(void *); 109 static void if_attachdomain1(struct ifnet *); 110 static int ifconf(u_long, caddr_t, struct ucred *); 111 static void ifinit(void *); 112 static void ifnetinit(void *); 113 static void if_slowtimo(void *); 114 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 115 static int if_rtdel(struct radix_node *, void *); 116 117 #ifdef INET6 118 /* 119 * XXX: declare here to avoid to include many inet6 related files.. 120 * should be more generalized? 121 */ 122 extern void nd6_setmtu(struct ifnet *); 123 #endif 124 125 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 126 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 127 128 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL) 129 /* Must be after netisr_init */ 130 SYSINIT(ifnet, SI_SUB_PRE_DRIVERS, SI_ORDER_SECOND, ifnetinit, NULL) 131 132 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 133 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 134 135 int ifqmaxlen = IFQ_MAXLEN; 136 struct ifnethead ifnet = TAILQ_HEAD_INITIALIZER(ifnet); 137 138 /* In ifq_dispatch(), try to do direct ifnet.if_start first */ 139 static int ifq_dispatch_schedonly = 0; 140 SYSCTL_INT(_net_link_generic, OID_AUTO, ifq_dispatch_schedonly, CTLFLAG_RW, 141 &ifq_dispatch_schedonly, 0, ""); 142 143 /* In ifq_dispatch(), schedule ifnet.if_start without checking ifnet.if_snd */ 144 static int ifq_dispatch_schednochk = 0; 145 SYSCTL_INT(_net_link_generic, OID_AUTO, ifq_dispatch_schednochk, CTLFLAG_RW, 146 &ifq_dispatch_schednochk, 0, ""); 147 148 /* In if_devstart(), try to do direct ifnet.if_start first */ 149 static int if_devstart_schedonly = 0; 150 SYSCTL_INT(_net_link_generic, OID_AUTO, if_devstart_schedonly, CTLFLAG_RW, 151 &if_devstart_schedonly, 0, ""); 152 153 /* In if_devstart(), schedule ifnet.if_start without checking ifnet.if_snd */ 154 static int if_devstart_schednochk = 0; 155 SYSCTL_INT(_net_link_generic, OID_AUTO, if_devstart_schednochk, CTLFLAG_RW, 156 &if_devstart_schednochk, 0, ""); 157 158 #ifdef SMP 159 /* Schedule ifnet.if_start on the current CPU */ 160 static int if_start_oncpu_sched = 0; 161 SYSCTL_INT(_net_link_generic, OID_AUTO, if_start_oncpu_sched, CTLFLAG_RW, 162 &if_start_oncpu_sched, 0, ""); 163 #endif 164 165 struct callout if_slowtimo_timer; 166 167 int if_index = 0; 168 struct ifnet **ifindex2ifnet = NULL; 169 static struct thread ifnet_threads[MAXCPU]; 170 static int ifnet_mpsafe_thread = NETMSG_SERVICE_MPSAFE; 171 172 #define IFQ_KTR_STRING "ifq=%p" 173 #define IFQ_KTR_ARG_SIZE (sizeof(void *)) 174 #ifndef KTR_IFQ 175 #define KTR_IFQ KTR_ALL 176 #endif 177 KTR_INFO_MASTER(ifq); 178 KTR_INFO(KTR_IFQ, ifq, enqueue, 0, IFQ_KTR_STRING, IFQ_KTR_ARG_SIZE); 179 KTR_INFO(KTR_IFQ, ifq, dequeue, 1, IFQ_KTR_STRING, IFQ_KTR_ARG_SIZE); 180 #define logifq(name, arg) KTR_LOG(ifq_ ## name, arg) 181 182 #define IF_START_KTR_STRING "ifp=%p" 183 #define IF_START_KTR_ARG_SIZE (sizeof(void *)) 184 #ifndef KTR_IF_START 185 #define KTR_IF_START KTR_ALL 186 #endif 187 KTR_INFO_MASTER(if_start); 188 KTR_INFO(KTR_IF_START, if_start, run, 0, 189 IF_START_KTR_STRING, IF_START_KTR_ARG_SIZE); 190 KTR_INFO(KTR_IF_START, if_start, sched, 1, 191 IF_START_KTR_STRING, IF_START_KTR_ARG_SIZE); 192 KTR_INFO(KTR_IF_START, if_start, avoid, 2, 193 IF_START_KTR_STRING, IF_START_KTR_ARG_SIZE); 194 KTR_INFO(KTR_IF_START, if_start, contend_sched, 3, 195 IF_START_KTR_STRING, IF_START_KTR_ARG_SIZE); 196 KTR_INFO(KTR_IF_START, if_start, chase_sched, 4, 197 IF_START_KTR_STRING, IF_START_KTR_ARG_SIZE); 198 #define logifstart(name, arg) KTR_LOG(if_start_ ## name, arg) 199 200 /* 201 * Network interface utility routines. 202 * 203 * Routines with ifa_ifwith* names take sockaddr *'s as 204 * parameters. 205 */ 206 /* ARGSUSED*/ 207 void 208 ifinit(void *dummy) 209 { 210 struct ifnet *ifp; 211 212 callout_init(&if_slowtimo_timer); 213 214 crit_enter(); 215 TAILQ_FOREACH(ifp, &ifnet, if_link) { 216 if (ifp->if_snd.ifq_maxlen == 0) { 217 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 218 ifp->if_snd.ifq_maxlen = ifqmaxlen; 219 } 220 } 221 crit_exit(); 222 223 if_slowtimo(0); 224 } 225 226 static int 227 if_start_cpuid(struct ifnet *ifp) 228 { 229 return ifp->if_cpuid; 230 } 231 232 #ifdef DEVICE_POLLING 233 static int 234 if_start_cpuid_poll(struct ifnet *ifp) 235 { 236 int poll_cpuid = ifp->if_poll_cpuid; 237 238 if (poll_cpuid >= 0) 239 return poll_cpuid; 240 else 241 return ifp->if_cpuid; 242 } 243 #endif 244 245 static void 246 if_start_ipifunc(void *arg) 247 { 248 struct ifnet *ifp = arg; 249 struct lwkt_msg *lmsg = &ifp->if_start_nmsg[mycpuid].nm_lmsg; 250 251 crit_enter(); 252 if (lmsg->ms_flags & MSGF_DONE) 253 lwkt_sendmsg(ifnet_portfn(mycpuid), lmsg); 254 crit_exit(); 255 } 256 257 /* 258 * Schedule ifnet.if_start on ifnet's CPU 259 */ 260 static void 261 if_start_schedule(struct ifnet *ifp) 262 { 263 #ifdef SMP 264 int cpu; 265 266 if (if_start_oncpu_sched) 267 cpu = mycpuid; 268 else 269 cpu = ifp->if_start_cpuid(ifp); 270 271 if (cpu != mycpuid) 272 lwkt_send_ipiq(globaldata_find(cpu), if_start_ipifunc, ifp); 273 else 274 #endif 275 if_start_ipifunc(ifp); 276 } 277 278 /* 279 * NOTE: 280 * This function will release ifnet.if_start interlock, 281 * if ifnet.if_start does not need to be scheduled 282 */ 283 static __inline int 284 if_start_need_schedule(struct ifaltq *ifq, int running) 285 { 286 if (!running || ifq_is_empty(ifq) 287 #ifdef ALTQ 288 || ifq->altq_tbr != NULL 289 #endif 290 ) { 291 ALTQ_LOCK(ifq); 292 /* 293 * ifnet.if_start interlock is released, if: 294 * 1) Hardware can not take any packets, due to 295 * o interface is marked down 296 * o hardware queue is full (IFF_OACTIVE) 297 * Under the second situation, hardware interrupt 298 * or polling(4) will call/schedule ifnet.if_start 299 * when hardware queue is ready 300 * 2) There is not packet in the ifnet.if_snd. 301 * Further ifq_dispatch or ifq_handoff will call/ 302 * schedule ifnet.if_start 303 * 3) TBR is used and it does not allow further 304 * dequeueing. 305 * TBR callout will call ifnet.if_start 306 */ 307 if (!running || !ifq_data_ready(ifq)) { 308 ifq->altq_started = 0; 309 ALTQ_UNLOCK(ifq); 310 return 0; 311 } 312 ALTQ_UNLOCK(ifq); 313 } 314 return 1; 315 } 316 317 static void 318 if_start_dispatch(struct netmsg *nmsg) 319 { 320 struct lwkt_msg *lmsg = &nmsg->nm_lmsg; 321 struct ifnet *ifp = lmsg->u.ms_resultp; 322 struct ifaltq *ifq = &ifp->if_snd; 323 int running = 0; 324 325 crit_enter(); 326 lwkt_replymsg(lmsg, 0); /* reply ASAP */ 327 crit_exit(); 328 329 #ifdef SMP 330 if (!if_start_oncpu_sched && mycpuid != ifp->if_start_cpuid(ifp)) { 331 /* 332 * If the ifnet is still up, we need to 333 * chase its CPU change. 334 */ 335 if (ifp->if_flags & IFF_UP) { 336 logifstart(chase_sched, ifp); 337 if_start_schedule(ifp); 338 return; 339 } else { 340 goto check; 341 } 342 } 343 #endif 344 345 if (ifp->if_flags & IFF_UP) { 346 ifnet_serialize_tx(ifp); /* XXX try? */ 347 if ((ifp->if_flags & IFF_OACTIVE) == 0) { 348 logifstart(run, ifp); 349 ifp->if_start(ifp); 350 if ((ifp->if_flags & 351 (IFF_OACTIVE | IFF_RUNNING)) == IFF_RUNNING) 352 running = 1; 353 } 354 ifnet_deserialize_tx(ifp); 355 } 356 #ifdef SMP 357 check: 358 #endif 359 if (if_start_need_schedule(ifq, running)) { 360 crit_enter(); 361 if (lmsg->ms_flags & MSGF_DONE) { /* XXX necessary? */ 362 logifstart(sched, ifp); 363 lwkt_sendmsg(ifnet_portfn(mycpuid), lmsg); 364 } 365 crit_exit(); 366 } 367 } 368 369 /* Device driver ifnet.if_start helper function */ 370 void 371 if_devstart(struct ifnet *ifp) 372 { 373 struct ifaltq *ifq = &ifp->if_snd; 374 int running = 0; 375 376 ASSERT_IFNET_SERIALIZED_TX(ifp); 377 378 ALTQ_LOCK(ifq); 379 if (ifq->altq_started || !ifq_data_ready(ifq)) { 380 logifstart(avoid, ifp); 381 ALTQ_UNLOCK(ifq); 382 return; 383 } 384 ifq->altq_started = 1; 385 ALTQ_UNLOCK(ifq); 386 387 if (if_devstart_schedonly) { 388 /* 389 * Always schedule ifnet.if_start on ifnet's CPU, 390 * short circuit the rest of this function. 391 */ 392 logifstart(sched, ifp); 393 if_start_schedule(ifp); 394 return; 395 } 396 397 logifstart(run, ifp); 398 ifp->if_start(ifp); 399 400 if ((ifp->if_flags & (IFF_OACTIVE | IFF_RUNNING)) == IFF_RUNNING) 401 running = 1; 402 403 if (if_devstart_schednochk || if_start_need_schedule(ifq, running)) { 404 /* 405 * More data need to be transmitted, ifnet.if_start is 406 * scheduled on ifnet's CPU, and we keep going. 407 * NOTE: ifnet.if_start interlock is not released. 408 */ 409 logifstart(sched, ifp); 410 if_start_schedule(ifp); 411 } 412 } 413 414 static void 415 if_default_serialize(struct ifnet *ifp, enum ifnet_serialize slz __unused) 416 { 417 lwkt_serialize_enter(ifp->if_serializer); 418 } 419 420 static void 421 if_default_deserialize(struct ifnet *ifp, enum ifnet_serialize slz __unused) 422 { 423 lwkt_serialize_exit(ifp->if_serializer); 424 } 425 426 static int 427 if_default_tryserialize(struct ifnet *ifp, enum ifnet_serialize slz __unused) 428 { 429 return lwkt_serialize_try(ifp->if_serializer); 430 } 431 432 #ifdef INVARIANTS 433 static void 434 if_default_serialize_assert(struct ifnet *ifp, 435 enum ifnet_serialize slz __unused, 436 boolean_t serialized) 437 { 438 if (serialized) 439 ASSERT_SERIALIZED(ifp->if_serializer); 440 else 441 ASSERT_NOT_SERIALIZED(ifp->if_serializer); 442 } 443 #endif 444 445 /* 446 * Attach an interface to the list of "active" interfaces. 447 * 448 * The serializer is optional. If non-NULL access to the interface 449 * may be MPSAFE. 450 */ 451 void 452 if_attach(struct ifnet *ifp, lwkt_serialize_t serializer) 453 { 454 unsigned socksize, ifasize; 455 int namelen, masklen; 456 struct sockaddr_dl *sdl; 457 struct ifaddr *ifa; 458 struct ifaltq *ifq; 459 int i; 460 461 static int if_indexlim = 8; 462 463 if (ifp->if_serialize != NULL) { 464 KASSERT(ifp->if_deserialize != NULL && 465 ifp->if_tryserialize != NULL && 466 ifp->if_serialize_assert != NULL, 467 ("serialize functions are partially setup\n")); 468 469 /* 470 * If the device supplies serialize functions, 471 * then clear if_serializer to catch any invalid 472 * usage of this field. 473 */ 474 KASSERT(serializer == NULL, 475 ("both serialize functions and default serializer " 476 "are supplied\n")); 477 ifp->if_serializer = NULL; 478 } else { 479 KASSERT(ifp->if_deserialize == NULL && 480 ifp->if_tryserialize == NULL && 481 ifp->if_serialize_assert == NULL, 482 ("serialize functions are partially setup\n")); 483 ifp->if_serialize = if_default_serialize; 484 ifp->if_deserialize = if_default_deserialize; 485 ifp->if_tryserialize = if_default_tryserialize; 486 #ifdef INVARIANTS 487 ifp->if_serialize_assert = if_default_serialize_assert; 488 #endif 489 490 /* 491 * The serializer can be passed in from the device, 492 * allowing the same serializer to be used for both 493 * the interrupt interlock and the device queue. 494 * If not specified, the netif structure will use an 495 * embedded serializer. 496 */ 497 if (serializer == NULL) { 498 serializer = &ifp->if_default_serializer; 499 lwkt_serialize_init(serializer); 500 } 501 ifp->if_serializer = serializer; 502 } 503 504 ifp->if_start_cpuid = if_start_cpuid; 505 ifp->if_cpuid = 0; 506 507 #ifdef DEVICE_POLLING 508 /* Device is not in polling mode by default */ 509 ifp->if_poll_cpuid = -1; 510 if (ifp->if_poll != NULL) 511 ifp->if_start_cpuid = if_start_cpuid_poll; 512 #endif 513 514 ifp->if_start_nmsg = kmalloc(ncpus * sizeof(struct netmsg), 515 M_LWKTMSG, M_WAITOK); 516 for (i = 0; i < ncpus; ++i) { 517 netmsg_init(&ifp->if_start_nmsg[i], &netisr_adone_rport, 0, 518 if_start_dispatch); 519 ifp->if_start_nmsg[i].nm_lmsg.u.ms_resultp = ifp; 520 } 521 522 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 523 ifp->if_index = ++if_index; 524 525 /* 526 * XXX - 527 * The old code would work if the interface passed a pre-existing 528 * chain of ifaddrs to this code. We don't trust our callers to 529 * properly initialize the tailq, however, so we no longer allow 530 * this unlikely case. 531 */ 532 ifp->if_addrheads = kmalloc(ncpus * sizeof(struct ifaddrhead), 533 M_IFADDR, M_WAITOK | M_ZERO); 534 for (i = 0; i < ncpus; ++i) 535 TAILQ_INIT(&ifp->if_addrheads[i]); 536 537 TAILQ_INIT(&ifp->if_prefixhead); 538 LIST_INIT(&ifp->if_multiaddrs); 539 getmicrotime(&ifp->if_lastchange); 540 if (ifindex2ifnet == NULL || if_index >= if_indexlim) { 541 unsigned int n; 542 struct ifnet **q; 543 544 if_indexlim <<= 1; 545 546 /* grow ifindex2ifnet */ 547 n = if_indexlim * sizeof(*q); 548 q = kmalloc(n, M_IFADDR, M_WAITOK | M_ZERO); 549 if (ifindex2ifnet) { 550 bcopy(ifindex2ifnet, q, n/2); 551 kfree(ifindex2ifnet, M_IFADDR); 552 } 553 ifindex2ifnet = q; 554 } 555 556 ifindex2ifnet[if_index] = ifp; 557 558 /* 559 * create a Link Level name for this device 560 */ 561 namelen = strlen(ifp->if_xname); 562 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m)) 563 masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen; 564 socksize = masklen + ifp->if_addrlen; 565 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1))) 566 if (socksize < sizeof(*sdl)) 567 socksize = sizeof(*sdl); 568 socksize = ROUNDUP(socksize); 569 ifasize = sizeof(struct ifaddr) + 2 * socksize; 570 ifa = ifa_create(ifasize, M_WAITOK); 571 sdl = (struct sockaddr_dl *)(ifa + 1); 572 sdl->sdl_len = socksize; 573 sdl->sdl_family = AF_LINK; 574 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 575 sdl->sdl_nlen = namelen; 576 sdl->sdl_index = ifp->if_index; 577 sdl->sdl_type = ifp->if_type; 578 ifp->if_lladdr = ifa; 579 ifa->ifa_ifp = ifp; 580 ifa->ifa_rtrequest = link_rtrequest; 581 ifa->ifa_addr = (struct sockaddr *)sdl; 582 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 583 ifa->ifa_netmask = (struct sockaddr *)sdl; 584 sdl->sdl_len = masklen; 585 while (namelen != 0) 586 sdl->sdl_data[--namelen] = 0xff; 587 ifa_iflink(ifa, ifp, 0 /* Insert head */); 588 589 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 590 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 591 592 ifq = &ifp->if_snd; 593 ifq->altq_type = 0; 594 ifq->altq_disc = NULL; 595 ifq->altq_flags &= ALTQF_CANTCHANGE; 596 ifq->altq_tbr = NULL; 597 ifq->altq_ifp = ifp; 598 ifq->altq_started = 0; 599 ifq->altq_prepended = NULL; 600 ALTQ_LOCK_INIT(ifq); 601 ifq_set_classic(ifq); 602 603 if (!SLIST_EMPTY(&domains)) 604 if_attachdomain1(ifp); 605 606 /* Announce the interface. */ 607 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 608 } 609 610 static void 611 if_attachdomain(void *dummy) 612 { 613 struct ifnet *ifp; 614 615 crit_enter(); 616 TAILQ_FOREACH(ifp, &ifnet, if_list) 617 if_attachdomain1(ifp); 618 crit_exit(); 619 } 620 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 621 if_attachdomain, NULL); 622 623 static void 624 if_attachdomain1(struct ifnet *ifp) 625 { 626 struct domain *dp; 627 628 crit_enter(); 629 630 /* address family dependent data region */ 631 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 632 SLIST_FOREACH(dp, &domains, dom_next) 633 if (dp->dom_ifattach) 634 ifp->if_afdata[dp->dom_family] = 635 (*dp->dom_ifattach)(ifp); 636 crit_exit(); 637 } 638 639 /* 640 * Purge all addresses whose type is _not_ AF_LINK 641 */ 642 void 643 if_purgeaddrs_nolink(struct ifnet *ifp) 644 { 645 struct ifaddr_container *ifac, *next; 646 647 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], 648 ifa_link, next) { 649 struct ifaddr *ifa = ifac->ifa; 650 651 /* Leave link ifaddr as it is */ 652 if (ifa->ifa_addr->sa_family == AF_LINK) 653 continue; 654 #ifdef INET 655 /* XXX: Ugly!! ad hoc just for INET */ 656 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 657 struct ifaliasreq ifr; 658 #ifdef IFADDR_DEBUG_VERBOSE 659 int i; 660 661 kprintf("purge in4 addr %p: ", ifa); 662 for (i = 0; i < ncpus; ++i) 663 kprintf("%d ", ifa->ifa_containers[i].ifa_refcnt); 664 kprintf("\n"); 665 #endif 666 667 bzero(&ifr, sizeof ifr); 668 ifr.ifra_addr = *ifa->ifa_addr; 669 if (ifa->ifa_dstaddr) 670 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 671 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 672 NULL) == 0) 673 continue; 674 } 675 #endif /* INET */ 676 #ifdef INET6 677 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 678 #ifdef IFADDR_DEBUG_VERBOSE 679 int i; 680 681 kprintf("purge in6 addr %p: ", ifa); 682 for (i = 0; i < ncpus; ++i) 683 kprintf("%d ", ifa->ifa_containers[i].ifa_refcnt); 684 kprintf("\n"); 685 #endif 686 687 in6_purgeaddr(ifa); 688 /* ifp_addrhead is already updated */ 689 continue; 690 } 691 #endif /* INET6 */ 692 ifa_ifunlink(ifa, ifp); 693 ifa_destroy(ifa); 694 } 695 } 696 697 /* 698 * Detach an interface, removing it from the 699 * list of "active" interfaces. 700 */ 701 void 702 if_detach(struct ifnet *ifp) 703 { 704 struct radix_node_head *rnh; 705 int i; 706 int cpu, origcpu; 707 struct domain *dp; 708 709 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 710 711 /* 712 * Remove routes and flush queues. 713 */ 714 crit_enter(); 715 #ifdef DEVICE_POLLING 716 if (ifp->if_flags & IFF_POLLING) 717 ether_poll_deregister(ifp); 718 #endif 719 #ifdef IFPOLL_ENABLE 720 if (ifp->if_flags & IFF_NPOLLING) 721 ifpoll_deregister(ifp); 722 #endif 723 if_down(ifp); 724 725 if (ifq_is_enabled(&ifp->if_snd)) 726 altq_disable(&ifp->if_snd); 727 if (ifq_is_attached(&ifp->if_snd)) 728 altq_detach(&ifp->if_snd); 729 730 /* 731 * Clean up all addresses. 732 */ 733 ifp->if_lladdr = NULL; 734 735 if_purgeaddrs_nolink(ifp); 736 if (!TAILQ_EMPTY(&ifp->if_addrheads[mycpuid])) { 737 struct ifaddr *ifa; 738 739 ifa = TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa; 740 KASSERT(ifa->ifa_addr->sa_family == AF_LINK, 741 ("non-link ifaddr is left on if_addrheads")); 742 743 ifa_ifunlink(ifa, ifp); 744 ifa_destroy(ifa); 745 KASSERT(TAILQ_EMPTY(&ifp->if_addrheads[mycpuid]), 746 ("there are still ifaddrs left on if_addrheads")); 747 } 748 749 #ifdef INET 750 /* 751 * Remove all IPv4 kernel structures related to ifp. 752 */ 753 in_ifdetach(ifp); 754 #endif 755 756 #ifdef INET6 757 /* 758 * Remove all IPv6 kernel structs related to ifp. This should be done 759 * before removing routing entries below, since IPv6 interface direct 760 * routes are expected to be removed by the IPv6-specific kernel API. 761 * Otherwise, the kernel will detect some inconsistency and bark it. 762 */ 763 in6_ifdetach(ifp); 764 #endif 765 766 /* 767 * Delete all remaining routes using this interface 768 * Unfortuneatly the only way to do this is to slog through 769 * the entire routing table looking for routes which point 770 * to this interface...oh well... 771 */ 772 origcpu = mycpuid; 773 for (cpu = 0; cpu < ncpus2; cpu++) { 774 lwkt_migratecpu(cpu); 775 for (i = 1; i <= AF_MAX; i++) { 776 if ((rnh = rt_tables[cpu][i]) == NULL) 777 continue; 778 rnh->rnh_walktree(rnh, if_rtdel, ifp); 779 } 780 } 781 lwkt_migratecpu(origcpu); 782 783 /* Announce that the interface is gone. */ 784 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 785 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 786 787 SLIST_FOREACH(dp, &domains, dom_next) 788 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 789 (*dp->dom_ifdetach)(ifp, 790 ifp->if_afdata[dp->dom_family]); 791 792 /* 793 * Remove interface from ifindex2ifp[] and maybe decrement if_index. 794 */ 795 ifindex2ifnet[ifp->if_index] = NULL; 796 while (if_index > 0 && ifindex2ifnet[if_index] == NULL) 797 if_index--; 798 799 TAILQ_REMOVE(&ifnet, ifp, if_link); 800 kfree(ifp->if_addrheads, M_IFADDR); 801 kfree(ifp->if_start_nmsg, M_LWKTMSG); 802 crit_exit(); 803 } 804 805 /* 806 * Delete Routes for a Network Interface 807 * 808 * Called for each routing entry via the rnh->rnh_walktree() call above 809 * to delete all route entries referencing a detaching network interface. 810 * 811 * Arguments: 812 * rn pointer to node in the routing table 813 * arg argument passed to rnh->rnh_walktree() - detaching interface 814 * 815 * Returns: 816 * 0 successful 817 * errno failed - reason indicated 818 * 819 */ 820 static int 821 if_rtdel(struct radix_node *rn, void *arg) 822 { 823 struct rtentry *rt = (struct rtentry *)rn; 824 struct ifnet *ifp = arg; 825 int err; 826 827 if (rt->rt_ifp == ifp) { 828 829 /* 830 * Protect (sorta) against walktree recursion problems 831 * with cloned routes 832 */ 833 if (!(rt->rt_flags & RTF_UP)) 834 return (0); 835 836 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 837 rt_mask(rt), rt->rt_flags, 838 NULL); 839 if (err) { 840 log(LOG_WARNING, "if_rtdel: error %d\n", err); 841 } 842 } 843 844 return (0); 845 } 846 847 /* 848 * Locate an interface based on a complete address. 849 */ 850 struct ifaddr * 851 ifa_ifwithaddr(struct sockaddr *addr) 852 { 853 struct ifnet *ifp; 854 855 TAILQ_FOREACH(ifp, &ifnet, if_link) { 856 struct ifaddr_container *ifac; 857 858 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 859 struct ifaddr *ifa = ifac->ifa; 860 861 if (ifa->ifa_addr->sa_family != addr->sa_family) 862 continue; 863 if (sa_equal(addr, ifa->ifa_addr)) 864 return (ifa); 865 if ((ifp->if_flags & IFF_BROADCAST) && 866 ifa->ifa_broadaddr && 867 /* IPv6 doesn't have broadcast */ 868 ifa->ifa_broadaddr->sa_len != 0 && 869 sa_equal(ifa->ifa_broadaddr, addr)) 870 return (ifa); 871 } 872 } 873 return (NULL); 874 } 875 /* 876 * Locate the point to point interface with a given destination address. 877 */ 878 struct ifaddr * 879 ifa_ifwithdstaddr(struct sockaddr *addr) 880 { 881 struct ifnet *ifp; 882 883 TAILQ_FOREACH(ifp, &ifnet, if_link) { 884 struct ifaddr_container *ifac; 885 886 if (!(ifp->if_flags & IFF_POINTOPOINT)) 887 continue; 888 889 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 890 struct ifaddr *ifa = ifac->ifa; 891 892 if (ifa->ifa_addr->sa_family != addr->sa_family) 893 continue; 894 if (ifa->ifa_dstaddr && 895 sa_equal(addr, ifa->ifa_dstaddr)) 896 return (ifa); 897 } 898 } 899 return (NULL); 900 } 901 902 /* 903 * Find an interface on a specific network. If many, choice 904 * is most specific found. 905 */ 906 struct ifaddr * 907 ifa_ifwithnet(struct sockaddr *addr) 908 { 909 struct ifnet *ifp; 910 struct ifaddr *ifa_maybe = NULL; 911 u_int af = addr->sa_family; 912 char *addr_data = addr->sa_data, *cplim; 913 914 /* 915 * AF_LINK addresses can be looked up directly by their index number, 916 * so do that if we can. 917 */ 918 if (af == AF_LINK) { 919 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 920 921 if (sdl->sdl_index && sdl->sdl_index <= if_index) 922 return (ifindex2ifnet[sdl->sdl_index]->if_lladdr); 923 } 924 925 /* 926 * Scan though each interface, looking for ones that have 927 * addresses in this address family. 928 */ 929 TAILQ_FOREACH(ifp, &ifnet, if_link) { 930 struct ifaddr_container *ifac; 931 932 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 933 struct ifaddr *ifa = ifac->ifa; 934 char *cp, *cp2, *cp3; 935 936 if (ifa->ifa_addr->sa_family != af) 937 next: continue; 938 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 939 /* 940 * This is a bit broken as it doesn't 941 * take into account that the remote end may 942 * be a single node in the network we are 943 * looking for. 944 * The trouble is that we don't know the 945 * netmask for the remote end. 946 */ 947 if (ifa->ifa_dstaddr != NULL && 948 sa_equal(addr, ifa->ifa_dstaddr)) 949 return (ifa); 950 } else { 951 /* 952 * if we have a special address handler, 953 * then use it instead of the generic one. 954 */ 955 if (ifa->ifa_claim_addr) { 956 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 957 return (ifa); 958 } else { 959 continue; 960 } 961 } 962 963 /* 964 * Scan all the bits in the ifa's address. 965 * If a bit dissagrees with what we are 966 * looking for, mask it with the netmask 967 * to see if it really matters. 968 * (A byte at a time) 969 */ 970 if (ifa->ifa_netmask == 0) 971 continue; 972 cp = addr_data; 973 cp2 = ifa->ifa_addr->sa_data; 974 cp3 = ifa->ifa_netmask->sa_data; 975 cplim = ifa->ifa_netmask->sa_len + 976 (char *)ifa->ifa_netmask; 977 while (cp3 < cplim) 978 if ((*cp++ ^ *cp2++) & *cp3++) 979 goto next; /* next address! */ 980 /* 981 * If the netmask of what we just found 982 * is more specific than what we had before 983 * (if we had one) then remember the new one 984 * before continuing to search 985 * for an even better one. 986 */ 987 if (ifa_maybe == 0 || 988 rn_refines((char *)ifa->ifa_netmask, 989 (char *)ifa_maybe->ifa_netmask)) 990 ifa_maybe = ifa; 991 } 992 } 993 } 994 return (ifa_maybe); 995 } 996 997 /* 998 * Find an interface address specific to an interface best matching 999 * a given address. 1000 */ 1001 struct ifaddr * 1002 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1003 { 1004 struct ifaddr_container *ifac; 1005 char *cp, *cp2, *cp3; 1006 char *cplim; 1007 struct ifaddr *ifa_maybe = 0; 1008 u_int af = addr->sa_family; 1009 1010 if (af >= AF_MAX) 1011 return (0); 1012 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1013 struct ifaddr *ifa = ifac->ifa; 1014 1015 if (ifa->ifa_addr->sa_family != af) 1016 continue; 1017 if (ifa_maybe == 0) 1018 ifa_maybe = ifa; 1019 if (ifa->ifa_netmask == NULL) { 1020 if (sa_equal(addr, ifa->ifa_addr) || 1021 (ifa->ifa_dstaddr != NULL && 1022 sa_equal(addr, ifa->ifa_dstaddr))) 1023 return (ifa); 1024 continue; 1025 } 1026 if (ifp->if_flags & IFF_POINTOPOINT) { 1027 if (sa_equal(addr, ifa->ifa_dstaddr)) 1028 return (ifa); 1029 } else { 1030 cp = addr->sa_data; 1031 cp2 = ifa->ifa_addr->sa_data; 1032 cp3 = ifa->ifa_netmask->sa_data; 1033 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1034 for (; cp3 < cplim; cp3++) 1035 if ((*cp++ ^ *cp2++) & *cp3) 1036 break; 1037 if (cp3 == cplim) 1038 return (ifa); 1039 } 1040 } 1041 return (ifa_maybe); 1042 } 1043 1044 /* 1045 * Default action when installing a route with a Link Level gateway. 1046 * Lookup an appropriate real ifa to point to. 1047 * This should be moved to /sys/net/link.c eventually. 1048 */ 1049 static void 1050 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1051 { 1052 struct ifaddr *ifa; 1053 struct sockaddr *dst; 1054 struct ifnet *ifp; 1055 1056 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL || 1057 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL) 1058 return; 1059 ifa = ifaof_ifpforaddr(dst, ifp); 1060 if (ifa != NULL) { 1061 IFAFREE(rt->rt_ifa); 1062 IFAREF(ifa); 1063 rt->rt_ifa = ifa; 1064 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1065 ifa->ifa_rtrequest(cmd, rt, info); 1066 } 1067 } 1068 1069 /* 1070 * Mark an interface down and notify protocols of 1071 * the transition. 1072 * NOTE: must be called at splnet or eqivalent. 1073 */ 1074 void 1075 if_unroute(struct ifnet *ifp, int flag, int fam) 1076 { 1077 struct ifaddr_container *ifac; 1078 1079 ifp->if_flags &= ~flag; 1080 getmicrotime(&ifp->if_lastchange); 1081 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1082 struct ifaddr *ifa = ifac->ifa; 1083 1084 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1085 kpfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1086 } 1087 ifq_purge(&ifp->if_snd); 1088 rt_ifmsg(ifp); 1089 } 1090 1091 /* 1092 * Mark an interface up and notify protocols of 1093 * the transition. 1094 * NOTE: must be called at splnet or eqivalent. 1095 */ 1096 void 1097 if_route(struct ifnet *ifp, int flag, int fam) 1098 { 1099 struct ifaddr_container *ifac; 1100 1101 ifq_purge(&ifp->if_snd); 1102 ifp->if_flags |= flag; 1103 getmicrotime(&ifp->if_lastchange); 1104 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1105 struct ifaddr *ifa = ifac->ifa; 1106 1107 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1108 kpfctlinput(PRC_IFUP, ifa->ifa_addr); 1109 } 1110 rt_ifmsg(ifp); 1111 #ifdef INET6 1112 in6_if_up(ifp); 1113 #endif 1114 } 1115 1116 /* 1117 * Mark an interface down and notify protocols of the transition. An 1118 * interface going down is also considered to be a synchronizing event. 1119 * We must ensure that all packet processing related to the interface 1120 * has completed before we return so e.g. the caller can free the ifnet 1121 * structure that the mbufs may be referencing. 1122 * 1123 * NOTE: must be called at splnet or eqivalent. 1124 */ 1125 void 1126 if_down(struct ifnet *ifp) 1127 { 1128 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1129 netmsg_service_sync(); 1130 } 1131 1132 /* 1133 * Mark an interface up and notify protocols of 1134 * the transition. 1135 * NOTE: must be called at splnet or eqivalent. 1136 */ 1137 void 1138 if_up(struct ifnet *ifp) 1139 { 1140 if_route(ifp, IFF_UP, AF_UNSPEC); 1141 } 1142 1143 /* 1144 * Process a link state change. 1145 * NOTE: must be called at splsoftnet or equivalent. 1146 */ 1147 void 1148 if_link_state_change(struct ifnet *ifp) 1149 { 1150 int link_state = ifp->if_link_state; 1151 1152 rt_ifmsg(ifp); 1153 devctl_notify("IFNET", ifp->if_xname, 1154 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL); 1155 } 1156 1157 /* 1158 * Handle interface watchdog timer routines. Called 1159 * from softclock, we decrement timers (if set) and 1160 * call the appropriate interface routine on expiration. 1161 */ 1162 static void 1163 if_slowtimo(void *arg) 1164 { 1165 struct ifnet *ifp; 1166 1167 crit_enter(); 1168 1169 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1170 if (ifp->if_timer == 0 || --ifp->if_timer) 1171 continue; 1172 if (ifp->if_watchdog) { 1173 if (ifnet_tryserialize_all(ifp)) { 1174 (*ifp->if_watchdog)(ifp); 1175 ifnet_deserialize_all(ifp); 1176 } else { 1177 /* try again next timeout */ 1178 ++ifp->if_timer; 1179 } 1180 } 1181 } 1182 1183 crit_exit(); 1184 1185 callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 1186 } 1187 1188 /* 1189 * Map interface name to 1190 * interface structure pointer. 1191 */ 1192 struct ifnet * 1193 ifunit(const char *name) 1194 { 1195 struct ifnet *ifp; 1196 1197 /* 1198 * Search all the interfaces for this name/number 1199 */ 1200 1201 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1202 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0) 1203 break; 1204 } 1205 return (ifp); 1206 } 1207 1208 1209 /* 1210 * Map interface name in a sockaddr_dl to 1211 * interface structure pointer. 1212 */ 1213 struct ifnet * 1214 if_withname(struct sockaddr *sa) 1215 { 1216 char ifname[IFNAMSIZ+1]; 1217 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa; 1218 1219 if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) || 1220 (sdl->sdl_nlen > IFNAMSIZ) ) 1221 return NULL; 1222 1223 /* 1224 * ifunit wants a null-terminated name. It may not be null-terminated 1225 * in the sockaddr. We don't want to change the caller's sockaddr, 1226 * and there might not be room to put the trailing null anyway, so we 1227 * make a local copy that we know we can null terminate safely. 1228 */ 1229 1230 bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen); 1231 ifname[sdl->sdl_nlen] = '\0'; 1232 return ifunit(ifname); 1233 } 1234 1235 1236 /* 1237 * Interface ioctls. 1238 */ 1239 int 1240 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct ucred *cred) 1241 { 1242 struct ifnet *ifp; 1243 struct ifreq *ifr; 1244 struct ifstat *ifs; 1245 int error; 1246 short oif_flags; 1247 int new_flags; 1248 size_t namelen, onamelen; 1249 char new_name[IFNAMSIZ]; 1250 struct ifaddr *ifa; 1251 struct sockaddr_dl *sdl; 1252 1253 switch (cmd) { 1254 1255 case SIOCGIFCONF: 1256 case OSIOCGIFCONF: 1257 return (ifconf(cmd, data, cred)); 1258 } 1259 ifr = (struct ifreq *)data; 1260 1261 switch (cmd) { 1262 case SIOCIFCREATE: 1263 case SIOCIFDESTROY: 1264 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0) 1265 return (error); 1266 return ((cmd == SIOCIFCREATE) ? 1267 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1268 if_clone_destroy(ifr->ifr_name)); 1269 1270 case SIOCIFGCLONERS: 1271 return (if_clone_list((struct if_clonereq *)data)); 1272 } 1273 1274 ifp = ifunit(ifr->ifr_name); 1275 if (ifp == 0) 1276 return (ENXIO); 1277 switch (cmd) { 1278 1279 case SIOCGIFINDEX: 1280 ifr->ifr_index = ifp->if_index; 1281 break; 1282 1283 case SIOCGIFFLAGS: 1284 ifr->ifr_flags = ifp->if_flags; 1285 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1286 break; 1287 1288 case SIOCGIFCAP: 1289 ifr->ifr_reqcap = ifp->if_capabilities; 1290 ifr->ifr_curcap = ifp->if_capenable; 1291 break; 1292 1293 case SIOCGIFMETRIC: 1294 ifr->ifr_metric = ifp->if_metric; 1295 break; 1296 1297 case SIOCGIFMTU: 1298 ifr->ifr_mtu = ifp->if_mtu; 1299 break; 1300 1301 case SIOCGIFPHYS: 1302 ifr->ifr_phys = ifp->if_physical; 1303 break; 1304 1305 case SIOCGIFPOLLCPU: 1306 #ifdef DEVICE_POLLING 1307 ifr->ifr_pollcpu = ifp->if_poll_cpuid; 1308 #else 1309 ifr->ifr_pollcpu = -1; 1310 #endif 1311 break; 1312 1313 case SIOCSIFPOLLCPU: 1314 #ifdef DEVICE_POLLING 1315 if ((ifp->if_flags & IFF_POLLING) == 0) 1316 ether_pollcpu_register(ifp, ifr->ifr_pollcpu); 1317 #endif 1318 break; 1319 1320 case SIOCSIFFLAGS: 1321 error = priv_check_cred(cred, PRIV_ROOT, 0); 1322 if (error) 1323 return (error); 1324 new_flags = (ifr->ifr_flags & 0xffff) | 1325 (ifr->ifr_flagshigh << 16); 1326 if (ifp->if_flags & IFF_SMART) { 1327 /* Smart drivers twiddle their own routes */ 1328 } else if (ifp->if_flags & IFF_UP && 1329 (new_flags & IFF_UP) == 0) { 1330 crit_enter(); 1331 if_down(ifp); 1332 crit_exit(); 1333 } else if (new_flags & IFF_UP && 1334 (ifp->if_flags & IFF_UP) == 0) { 1335 crit_enter(); 1336 if_up(ifp); 1337 crit_exit(); 1338 } 1339 1340 #ifdef DEVICE_POLLING 1341 if ((new_flags ^ ifp->if_flags) & IFF_POLLING) { 1342 if (new_flags & IFF_POLLING) { 1343 ether_poll_register(ifp); 1344 } else { 1345 ether_poll_deregister(ifp); 1346 } 1347 } 1348 #endif 1349 #ifdef IFPOLL_ENABLE 1350 if ((new_flags ^ ifp->if_flags) & IFF_NPOLLING) { 1351 if (new_flags & IFF_NPOLLING) 1352 ifpoll_register(ifp); 1353 else 1354 ifpoll_deregister(ifp); 1355 } 1356 #endif 1357 1358 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1359 (new_flags &~ IFF_CANTCHANGE); 1360 if (new_flags & IFF_PPROMISC) { 1361 /* Permanently promiscuous mode requested */ 1362 ifp->if_flags |= IFF_PROMISC; 1363 } else if (ifp->if_pcount == 0) { 1364 ifp->if_flags &= ~IFF_PROMISC; 1365 } 1366 if (ifp->if_ioctl) { 1367 ifnet_serialize_all(ifp); 1368 ifp->if_ioctl(ifp, cmd, data, cred); 1369 ifnet_deserialize_all(ifp); 1370 } 1371 getmicrotime(&ifp->if_lastchange); 1372 break; 1373 1374 case SIOCSIFCAP: 1375 error = priv_check_cred(cred, PRIV_ROOT, 0); 1376 if (error) 1377 return (error); 1378 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1379 return (EINVAL); 1380 ifnet_serialize_all(ifp); 1381 ifp->if_ioctl(ifp, cmd, data, cred); 1382 ifnet_deserialize_all(ifp); 1383 break; 1384 1385 case SIOCSIFNAME: 1386 error = priv_check_cred(cred, PRIV_ROOT, 0); 1387 if (error != 0) 1388 return (error); 1389 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1390 if (error != 0) 1391 return (error); 1392 if (new_name[0] == '\0') 1393 return (EINVAL); 1394 if (ifunit(new_name) != NULL) 1395 return (EEXIST); 1396 1397 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp); 1398 1399 /* Announce the departure of the interface. */ 1400 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1401 1402 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1403 ifa = TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa; 1404 /* XXX IFA_LOCK(ifa); */ 1405 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1406 namelen = strlen(new_name); 1407 onamelen = sdl->sdl_nlen; 1408 /* 1409 * Move the address if needed. This is safe because we 1410 * allocate space for a name of length IFNAMSIZ when we 1411 * create this in if_attach(). 1412 */ 1413 if (namelen != onamelen) { 1414 bcopy(sdl->sdl_data + onamelen, 1415 sdl->sdl_data + namelen, sdl->sdl_alen); 1416 } 1417 bcopy(new_name, sdl->sdl_data, namelen); 1418 sdl->sdl_nlen = namelen; 1419 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1420 bzero(sdl->sdl_data, onamelen); 1421 while (namelen != 0) 1422 sdl->sdl_data[--namelen] = 0xff; 1423 /* XXX IFA_UNLOCK(ifa) */ 1424 1425 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp); 1426 1427 /* Announce the return of the interface. */ 1428 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1429 break; 1430 1431 case SIOCSIFMETRIC: 1432 error = priv_check_cred(cred, PRIV_ROOT, 0); 1433 if (error) 1434 return (error); 1435 ifp->if_metric = ifr->ifr_metric; 1436 getmicrotime(&ifp->if_lastchange); 1437 break; 1438 1439 case SIOCSIFPHYS: 1440 error = priv_check_cred(cred, PRIV_ROOT, 0); 1441 if (error) 1442 return error; 1443 if (!ifp->if_ioctl) 1444 return EOPNOTSUPP; 1445 ifnet_serialize_all(ifp); 1446 error = ifp->if_ioctl(ifp, cmd, data, cred); 1447 ifnet_deserialize_all(ifp); 1448 if (error == 0) 1449 getmicrotime(&ifp->if_lastchange); 1450 return (error); 1451 1452 case SIOCSIFMTU: 1453 { 1454 u_long oldmtu = ifp->if_mtu; 1455 1456 error = priv_check_cred(cred, PRIV_ROOT, 0); 1457 if (error) 1458 return (error); 1459 if (ifp->if_ioctl == NULL) 1460 return (EOPNOTSUPP); 1461 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1462 return (EINVAL); 1463 ifnet_serialize_all(ifp); 1464 error = ifp->if_ioctl(ifp, cmd, data, cred); 1465 ifnet_deserialize_all(ifp); 1466 if (error == 0) { 1467 getmicrotime(&ifp->if_lastchange); 1468 rt_ifmsg(ifp); 1469 } 1470 /* 1471 * If the link MTU changed, do network layer specific procedure. 1472 */ 1473 if (ifp->if_mtu != oldmtu) { 1474 #ifdef INET6 1475 nd6_setmtu(ifp); 1476 #endif 1477 } 1478 return (error); 1479 } 1480 1481 case SIOCADDMULTI: 1482 case SIOCDELMULTI: 1483 error = priv_check_cred(cred, PRIV_ROOT, 0); 1484 if (error) 1485 return (error); 1486 1487 /* Don't allow group membership on non-multicast interfaces. */ 1488 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1489 return EOPNOTSUPP; 1490 1491 /* Don't let users screw up protocols' entries. */ 1492 if (ifr->ifr_addr.sa_family != AF_LINK) 1493 return EINVAL; 1494 1495 if (cmd == SIOCADDMULTI) { 1496 struct ifmultiaddr *ifma; 1497 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1498 } else { 1499 error = if_delmulti(ifp, &ifr->ifr_addr); 1500 } 1501 if (error == 0) 1502 getmicrotime(&ifp->if_lastchange); 1503 return error; 1504 1505 case SIOCSIFPHYADDR: 1506 case SIOCDIFPHYADDR: 1507 #ifdef INET6 1508 case SIOCSIFPHYADDR_IN6: 1509 #endif 1510 case SIOCSLIFPHYADDR: 1511 case SIOCSIFMEDIA: 1512 case SIOCSIFGENERIC: 1513 error = priv_check_cred(cred, PRIV_ROOT, 0); 1514 if (error) 1515 return (error); 1516 if (ifp->if_ioctl == 0) 1517 return (EOPNOTSUPP); 1518 ifnet_serialize_all(ifp); 1519 error = ifp->if_ioctl(ifp, cmd, data, cred); 1520 ifnet_deserialize_all(ifp); 1521 if (error == 0) 1522 getmicrotime(&ifp->if_lastchange); 1523 return error; 1524 1525 case SIOCGIFSTATUS: 1526 ifs = (struct ifstat *)data; 1527 ifs->ascii[0] = '\0'; 1528 1529 case SIOCGIFPSRCADDR: 1530 case SIOCGIFPDSTADDR: 1531 case SIOCGLIFPHYADDR: 1532 case SIOCGIFMEDIA: 1533 case SIOCGIFGENERIC: 1534 if (ifp->if_ioctl == NULL) 1535 return (EOPNOTSUPP); 1536 ifnet_serialize_all(ifp); 1537 error = ifp->if_ioctl(ifp, cmd, data, cred); 1538 ifnet_deserialize_all(ifp); 1539 return (error); 1540 1541 case SIOCSIFLLADDR: 1542 error = priv_check_cred(cred, PRIV_ROOT, 0); 1543 if (error) 1544 return (error); 1545 return if_setlladdr(ifp, 1546 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1547 1548 default: 1549 oif_flags = ifp->if_flags; 1550 if (so->so_proto == 0) 1551 return (EOPNOTSUPP); 1552 #ifndef COMPAT_43 1553 error = so_pru_control(so, cmd, data, ifp); 1554 #else 1555 { 1556 int ocmd = cmd; 1557 1558 switch (cmd) { 1559 1560 case SIOCSIFDSTADDR: 1561 case SIOCSIFADDR: 1562 case SIOCSIFBRDADDR: 1563 case SIOCSIFNETMASK: 1564 #if BYTE_ORDER != BIG_ENDIAN 1565 if (ifr->ifr_addr.sa_family == 0 && 1566 ifr->ifr_addr.sa_len < 16) { 1567 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1568 ifr->ifr_addr.sa_len = 16; 1569 } 1570 #else 1571 if (ifr->ifr_addr.sa_len == 0) 1572 ifr->ifr_addr.sa_len = 16; 1573 #endif 1574 break; 1575 1576 case OSIOCGIFADDR: 1577 cmd = SIOCGIFADDR; 1578 break; 1579 1580 case OSIOCGIFDSTADDR: 1581 cmd = SIOCGIFDSTADDR; 1582 break; 1583 1584 case OSIOCGIFBRDADDR: 1585 cmd = SIOCGIFBRDADDR; 1586 break; 1587 1588 case OSIOCGIFNETMASK: 1589 cmd = SIOCGIFNETMASK; 1590 } 1591 error = so_pru_control(so, cmd, data, ifp); 1592 switch (ocmd) { 1593 1594 case OSIOCGIFADDR: 1595 case OSIOCGIFDSTADDR: 1596 case OSIOCGIFBRDADDR: 1597 case OSIOCGIFNETMASK: 1598 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1599 1600 } 1601 } 1602 #endif /* COMPAT_43 */ 1603 1604 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1605 #ifdef INET6 1606 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1607 if (ifp->if_flags & IFF_UP) { 1608 crit_enter(); 1609 in6_if_up(ifp); 1610 crit_exit(); 1611 } 1612 #endif 1613 } 1614 return (error); 1615 1616 } 1617 return (0); 1618 } 1619 1620 /* 1621 * Set/clear promiscuous mode on interface ifp based on the truth value 1622 * of pswitch. The calls are reference counted so that only the first 1623 * "on" request actually has an effect, as does the final "off" request. 1624 * Results are undefined if the "off" and "on" requests are not matched. 1625 */ 1626 int 1627 ifpromisc(struct ifnet *ifp, int pswitch) 1628 { 1629 struct ifreq ifr; 1630 int error; 1631 int oldflags; 1632 1633 oldflags = ifp->if_flags; 1634 if (ifp->if_flags & IFF_PPROMISC) { 1635 /* Do nothing if device is in permanently promiscuous mode */ 1636 ifp->if_pcount += pswitch ? 1 : -1; 1637 return (0); 1638 } 1639 if (pswitch) { 1640 /* 1641 * If the device is not configured up, we cannot put it in 1642 * promiscuous mode. 1643 */ 1644 if ((ifp->if_flags & IFF_UP) == 0) 1645 return (ENETDOWN); 1646 if (ifp->if_pcount++ != 0) 1647 return (0); 1648 ifp->if_flags |= IFF_PROMISC; 1649 log(LOG_INFO, "%s: promiscuous mode enabled\n", 1650 ifp->if_xname); 1651 } else { 1652 if (--ifp->if_pcount > 0) 1653 return (0); 1654 ifp->if_flags &= ~IFF_PROMISC; 1655 log(LOG_INFO, "%s: promiscuous mode disabled\n", 1656 ifp->if_xname); 1657 } 1658 ifr.ifr_flags = ifp->if_flags; 1659 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1660 ifnet_serialize_all(ifp); 1661 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, NULL); 1662 ifnet_deserialize_all(ifp); 1663 if (error == 0) 1664 rt_ifmsg(ifp); 1665 else 1666 ifp->if_flags = oldflags; 1667 return error; 1668 } 1669 1670 /* 1671 * Return interface configuration 1672 * of system. List may be used 1673 * in later ioctl's (above) to get 1674 * other information. 1675 */ 1676 static int 1677 ifconf(u_long cmd, caddr_t data, struct ucred *cred) 1678 { 1679 struct ifconf *ifc = (struct ifconf *)data; 1680 struct ifnet *ifp; 1681 struct sockaddr *sa; 1682 struct ifreq ifr, *ifrp; 1683 int space = ifc->ifc_len, error = 0; 1684 1685 ifrp = ifc->ifc_req; 1686 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1687 struct ifaddr_container *ifac; 1688 int addrs; 1689 1690 if (space <= sizeof ifr) 1691 break; 1692 1693 /* 1694 * Zero the stack declared structure first to prevent 1695 * memory disclosure. 1696 */ 1697 bzero(&ifr, sizeof(ifr)); 1698 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1699 >= sizeof(ifr.ifr_name)) { 1700 error = ENAMETOOLONG; 1701 break; 1702 } 1703 1704 addrs = 0; 1705 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1706 struct ifaddr *ifa = ifac->ifa; 1707 1708 if (space <= sizeof ifr) 1709 break; 1710 sa = ifa->ifa_addr; 1711 if (cred->cr_prison && 1712 prison_if(cred, sa)) 1713 continue; 1714 addrs++; 1715 #ifdef COMPAT_43 1716 if (cmd == OSIOCGIFCONF) { 1717 struct osockaddr *osa = 1718 (struct osockaddr *)&ifr.ifr_addr; 1719 ifr.ifr_addr = *sa; 1720 osa->sa_family = sa->sa_family; 1721 error = copyout(&ifr, ifrp, sizeof ifr); 1722 ifrp++; 1723 } else 1724 #endif 1725 if (sa->sa_len <= sizeof(*sa)) { 1726 ifr.ifr_addr = *sa; 1727 error = copyout(&ifr, ifrp, sizeof ifr); 1728 ifrp++; 1729 } else { 1730 if (space < (sizeof ifr) + sa->sa_len - 1731 sizeof(*sa)) 1732 break; 1733 space -= sa->sa_len - sizeof(*sa); 1734 error = copyout(&ifr, ifrp, 1735 sizeof ifr.ifr_name); 1736 if (error == 0) 1737 error = copyout(sa, &ifrp->ifr_addr, 1738 sa->sa_len); 1739 ifrp = (struct ifreq *) 1740 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1741 } 1742 if (error) 1743 break; 1744 space -= sizeof ifr; 1745 } 1746 if (error) 1747 break; 1748 if (!addrs) { 1749 bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr); 1750 error = copyout(&ifr, ifrp, sizeof ifr); 1751 if (error) 1752 break; 1753 space -= sizeof ifr; 1754 ifrp++; 1755 } 1756 } 1757 ifc->ifc_len -= space; 1758 return (error); 1759 } 1760 1761 /* 1762 * Just like if_promisc(), but for all-multicast-reception mode. 1763 */ 1764 int 1765 if_allmulti(struct ifnet *ifp, int onswitch) 1766 { 1767 int error = 0; 1768 struct ifreq ifr; 1769 1770 crit_enter(); 1771 1772 if (onswitch) { 1773 if (ifp->if_amcount++ == 0) { 1774 ifp->if_flags |= IFF_ALLMULTI; 1775 ifr.ifr_flags = ifp->if_flags; 1776 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1777 ifnet_serialize_all(ifp); 1778 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1779 NULL); 1780 ifnet_deserialize_all(ifp); 1781 } 1782 } else { 1783 if (ifp->if_amcount > 1) { 1784 ifp->if_amcount--; 1785 } else { 1786 ifp->if_amcount = 0; 1787 ifp->if_flags &= ~IFF_ALLMULTI; 1788 ifr.ifr_flags = ifp->if_flags; 1789 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1790 ifnet_serialize_all(ifp); 1791 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 1792 NULL); 1793 ifnet_deserialize_all(ifp); 1794 } 1795 } 1796 1797 crit_exit(); 1798 1799 if (error == 0) 1800 rt_ifmsg(ifp); 1801 return error; 1802 } 1803 1804 /* 1805 * Add a multicast listenership to the interface in question. 1806 * The link layer provides a routine which converts 1807 */ 1808 int 1809 if_addmulti( 1810 struct ifnet *ifp, /* interface to manipulate */ 1811 struct sockaddr *sa, /* address to add */ 1812 struct ifmultiaddr **retifma) 1813 { 1814 struct sockaddr *llsa, *dupsa; 1815 int error; 1816 struct ifmultiaddr *ifma; 1817 1818 /* 1819 * If the matching multicast address already exists 1820 * then don't add a new one, just add a reference 1821 */ 1822 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1823 if (sa_equal(sa, ifma->ifma_addr)) { 1824 ifma->ifma_refcount++; 1825 if (retifma) 1826 *retifma = ifma; 1827 return 0; 1828 } 1829 } 1830 1831 /* 1832 * Give the link layer a chance to accept/reject it, and also 1833 * find out which AF_LINK address this maps to, if it isn't one 1834 * already. 1835 */ 1836 if (ifp->if_resolvemulti) { 1837 ifnet_serialize_all(ifp); 1838 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1839 ifnet_deserialize_all(ifp); 1840 if (error) 1841 return error; 1842 } else { 1843 llsa = 0; 1844 } 1845 1846 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1847 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1848 bcopy(sa, dupsa, sa->sa_len); 1849 1850 ifma->ifma_addr = dupsa; 1851 ifma->ifma_lladdr = llsa; 1852 ifma->ifma_ifp = ifp; 1853 ifma->ifma_refcount = 1; 1854 ifma->ifma_protospec = 0; 1855 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1856 1857 /* 1858 * Some network interfaces can scan the address list at 1859 * interrupt time; lock them out. 1860 */ 1861 crit_enter(); 1862 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1863 crit_exit(); 1864 *retifma = ifma; 1865 1866 if (llsa != 0) { 1867 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1868 if (sa_equal(ifma->ifma_addr, llsa)) 1869 break; 1870 } 1871 if (ifma) { 1872 ifma->ifma_refcount++; 1873 } else { 1874 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1875 M_IFMADDR, M_WAITOK); 1876 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1877 M_IFMADDR, M_WAITOK); 1878 bcopy(llsa, dupsa, llsa->sa_len); 1879 ifma->ifma_addr = dupsa; 1880 ifma->ifma_ifp = ifp; 1881 ifma->ifma_refcount = 1; 1882 crit_enter(); 1883 LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1884 crit_exit(); 1885 } 1886 } 1887 /* 1888 * We are certain we have added something, so call down to the 1889 * interface to let them know about it. 1890 */ 1891 crit_enter(); 1892 ifnet_serialize_all(ifp); 1893 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, NULL); 1894 ifnet_deserialize_all(ifp); 1895 crit_exit(); 1896 1897 return 0; 1898 } 1899 1900 /* 1901 * Remove a reference to a multicast address on this interface. Yell 1902 * if the request does not match an existing membership. 1903 */ 1904 int 1905 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1906 { 1907 struct ifmultiaddr *ifma; 1908 1909 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1910 if (sa_equal(sa, ifma->ifma_addr)) 1911 break; 1912 if (ifma == 0) 1913 return ENOENT; 1914 1915 if (ifma->ifma_refcount > 1) { 1916 ifma->ifma_refcount--; 1917 return 0; 1918 } 1919 1920 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1921 sa = ifma->ifma_lladdr; 1922 crit_enter(); 1923 LIST_REMOVE(ifma, ifma_link); 1924 /* 1925 * Make sure the interface driver is notified 1926 * in the case of a link layer mcast group being left. 1927 */ 1928 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) { 1929 ifnet_serialize_all(ifp); 1930 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, NULL); 1931 ifnet_deserialize_all(ifp); 1932 } 1933 crit_exit(); 1934 kfree(ifma->ifma_addr, M_IFMADDR); 1935 kfree(ifma, M_IFMADDR); 1936 if (sa == 0) 1937 return 0; 1938 1939 /* 1940 * Now look for the link-layer address which corresponds to 1941 * this network address. It had been squirreled away in 1942 * ifma->ifma_lladdr for this purpose (so we don't have 1943 * to call ifp->if_resolvemulti() again), and we saved that 1944 * value in sa above. If some nasty deleted the 1945 * link-layer address out from underneath us, we can deal because 1946 * the address we stored was is not the same as the one which was 1947 * in the record for the link-layer address. (So we don't complain 1948 * in that case.) 1949 */ 1950 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1951 if (sa_equal(sa, ifma->ifma_addr)) 1952 break; 1953 if (ifma == 0) 1954 return 0; 1955 1956 if (ifma->ifma_refcount > 1) { 1957 ifma->ifma_refcount--; 1958 return 0; 1959 } 1960 1961 crit_enter(); 1962 ifnet_serialize_all(ifp); 1963 LIST_REMOVE(ifma, ifma_link); 1964 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, NULL); 1965 ifnet_deserialize_all(ifp); 1966 crit_exit(); 1967 kfree(ifma->ifma_addr, M_IFMADDR); 1968 kfree(sa, M_IFMADDR); 1969 kfree(ifma, M_IFMADDR); 1970 1971 return 0; 1972 } 1973 1974 /* 1975 * Set the link layer address on an interface. 1976 * 1977 * At this time we only support certain types of interfaces, 1978 * and we don't allow the length of the address to change. 1979 */ 1980 int 1981 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1982 { 1983 struct sockaddr_dl *sdl; 1984 struct ifreq ifr; 1985 1986 sdl = IF_LLSOCKADDR(ifp); 1987 if (sdl == NULL) 1988 return (EINVAL); 1989 if (len != sdl->sdl_alen) /* don't allow length to change */ 1990 return (EINVAL); 1991 switch (ifp->if_type) { 1992 case IFT_ETHER: /* these types use struct arpcom */ 1993 case IFT_XETHER: 1994 case IFT_L2VLAN: 1995 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1996 bcopy(lladdr, LLADDR(sdl), len); 1997 break; 1998 default: 1999 return (ENODEV); 2000 } 2001 /* 2002 * If the interface is already up, we need 2003 * to re-init it in order to reprogram its 2004 * address filter. 2005 */ 2006 ifnet_serialize_all(ifp); 2007 if ((ifp->if_flags & IFF_UP) != 0) { 2008 struct ifaddr_container *ifac; 2009 2010 ifp->if_flags &= ~IFF_UP; 2011 ifr.ifr_flags = ifp->if_flags; 2012 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2013 ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 2014 NULL); 2015 ifp->if_flags |= IFF_UP; 2016 ifr.ifr_flags = ifp->if_flags; 2017 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2018 ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, 2019 NULL); 2020 #ifdef INET 2021 /* 2022 * Also send gratuitous ARPs to notify other nodes about 2023 * the address change. 2024 */ 2025 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2026 struct ifaddr *ifa = ifac->ifa; 2027 2028 if (ifa->ifa_addr != NULL && 2029 ifa->ifa_addr->sa_family == AF_INET) 2030 arp_ifinit(ifp, ifa); 2031 } 2032 #endif 2033 } 2034 ifnet_deserialize_all(ifp); 2035 return (0); 2036 } 2037 2038 struct ifmultiaddr * 2039 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 2040 { 2041 struct ifmultiaddr *ifma; 2042 2043 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 2044 if (sa_equal(ifma->ifma_addr, sa)) 2045 break; 2046 2047 return ifma; 2048 } 2049 2050 /* 2051 * This function locates the first real ethernet MAC from a network 2052 * card and loads it into node, returning 0 on success or ENOENT if 2053 * no suitable interfaces were found. It is used by the uuid code to 2054 * generate a unique 6-byte number. 2055 */ 2056 int 2057 if_getanyethermac(uint16_t *node, int minlen) 2058 { 2059 struct ifnet *ifp; 2060 struct sockaddr_dl *sdl; 2061 2062 TAILQ_FOREACH(ifp, &ifnet, if_link) { 2063 if (ifp->if_type != IFT_ETHER) 2064 continue; 2065 sdl = IF_LLSOCKADDR(ifp); 2066 if (sdl->sdl_alen < minlen) 2067 continue; 2068 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr, node, 2069 minlen); 2070 return(0); 2071 } 2072 return (ENOENT); 2073 } 2074 2075 /* 2076 * The name argument must be a pointer to storage which will last as 2077 * long as the interface does. For physical devices, the result of 2078 * device_get_name(dev) is a good choice and for pseudo-devices a 2079 * static string works well. 2080 */ 2081 void 2082 if_initname(struct ifnet *ifp, const char *name, int unit) 2083 { 2084 ifp->if_dname = name; 2085 ifp->if_dunit = unit; 2086 if (unit != IF_DUNIT_NONE) 2087 ksnprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2088 else 2089 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2090 } 2091 2092 int 2093 if_printf(struct ifnet *ifp, const char *fmt, ...) 2094 { 2095 __va_list ap; 2096 int retval; 2097 2098 retval = kprintf("%s: ", ifp->if_xname); 2099 __va_start(ap, fmt); 2100 retval += kvprintf(fmt, ap); 2101 __va_end(ap); 2102 return (retval); 2103 } 2104 2105 void 2106 ifq_set_classic(struct ifaltq *ifq) 2107 { 2108 ifq->altq_enqueue = ifq_classic_enqueue; 2109 ifq->altq_dequeue = ifq_classic_dequeue; 2110 ifq->altq_request = ifq_classic_request; 2111 } 2112 2113 int 2114 ifq_classic_enqueue(struct ifaltq *ifq, struct mbuf *m, 2115 struct altq_pktattr *pa __unused) 2116 { 2117 logifq(enqueue, ifq); 2118 if (IF_QFULL(ifq)) { 2119 m_freem(m); 2120 return(ENOBUFS); 2121 } else { 2122 IF_ENQUEUE(ifq, m); 2123 return(0); 2124 } 2125 } 2126 2127 struct mbuf * 2128 ifq_classic_dequeue(struct ifaltq *ifq, struct mbuf *mpolled, int op) 2129 { 2130 struct mbuf *m; 2131 2132 switch (op) { 2133 case ALTDQ_POLL: 2134 IF_POLL(ifq, m); 2135 break; 2136 case ALTDQ_REMOVE: 2137 logifq(dequeue, ifq); 2138 IF_DEQUEUE(ifq, m); 2139 break; 2140 default: 2141 panic("unsupported ALTQ dequeue op: %d", op); 2142 } 2143 KKASSERT(mpolled == NULL || mpolled == m); 2144 return(m); 2145 } 2146 2147 int 2148 ifq_classic_request(struct ifaltq *ifq, int req, void *arg) 2149 { 2150 switch (req) { 2151 case ALTRQ_PURGE: 2152 IF_DRAIN(ifq); 2153 break; 2154 default: 2155 panic("unsupported ALTQ request: %d", req); 2156 } 2157 return(0); 2158 } 2159 2160 int 2161 ifq_dispatch(struct ifnet *ifp, struct mbuf *m, struct altq_pktattr *pa) 2162 { 2163 struct ifaltq *ifq = &ifp->if_snd; 2164 int running = 0, error, start = 0; 2165 2166 ASSERT_IFNET_NOT_SERIALIZED_TX(ifp); 2167 2168 ALTQ_LOCK(ifq); 2169 error = ifq_enqueue_locked(ifq, m, pa); 2170 if (error) { 2171 ALTQ_UNLOCK(ifq); 2172 return error; 2173 } 2174 if (!ifq->altq_started) { 2175 /* 2176 * Hold the interlock of ifnet.if_start 2177 */ 2178 ifq->altq_started = 1; 2179 start = 1; 2180 } 2181 ALTQ_UNLOCK(ifq); 2182 2183 ifp->if_obytes += m->m_pkthdr.len; 2184 if (m->m_flags & M_MCAST) 2185 ifp->if_omcasts++; 2186 2187 if (!start) { 2188 logifstart(avoid, ifp); 2189 return 0; 2190 } 2191 2192 if (ifq_dispatch_schedonly) { 2193 /* 2194 * Always schedule ifnet.if_start on ifnet's CPU, 2195 * short circuit the rest of this function. 2196 */ 2197 logifstart(sched, ifp); 2198 if_start_schedule(ifp); 2199 return 0; 2200 } 2201 2202 /* 2203 * Try to do direct ifnet.if_start first, if there is 2204 * contention on ifnet's serializer, ifnet.if_start will 2205 * be scheduled on ifnet's CPU. 2206 */ 2207 if (!ifnet_tryserialize_tx(ifp)) { 2208 /* 2209 * ifnet serializer contention happened, 2210 * ifnet.if_start is scheduled on ifnet's 2211 * CPU, and we keep going. 2212 */ 2213 logifstart(contend_sched, ifp); 2214 if_start_schedule(ifp); 2215 return 0; 2216 } 2217 2218 if ((ifp->if_flags & IFF_OACTIVE) == 0) { 2219 logifstart(run, ifp); 2220 ifp->if_start(ifp); 2221 if ((ifp->if_flags & 2222 (IFF_OACTIVE | IFF_RUNNING)) == IFF_RUNNING) 2223 running = 1; 2224 } 2225 2226 ifnet_deserialize_tx(ifp); 2227 2228 if (ifq_dispatch_schednochk || if_start_need_schedule(ifq, running)) { 2229 /* 2230 * More data need to be transmitted, ifnet.if_start is 2231 * scheduled on ifnet's CPU, and we keep going. 2232 * NOTE: ifnet.if_start interlock is not released. 2233 */ 2234 logifstart(sched, ifp); 2235 if_start_schedule(ifp); 2236 } 2237 return 0; 2238 } 2239 2240 void * 2241 ifa_create(int size, int flags) 2242 { 2243 struct ifaddr *ifa; 2244 int i; 2245 2246 KASSERT(size >= sizeof(*ifa), ("ifaddr size too small\n")); 2247 2248 ifa = kmalloc(size, M_IFADDR, flags | M_ZERO); 2249 if (ifa == NULL) 2250 return NULL; 2251 2252 ifa->ifa_containers = kmalloc(ncpus * sizeof(struct ifaddr_container), 2253 M_IFADDR, M_WAITOK | M_ZERO); 2254 ifa->ifa_ncnt = ncpus; 2255 for (i = 0; i < ncpus; ++i) { 2256 struct ifaddr_container *ifac = &ifa->ifa_containers[i]; 2257 2258 ifac->ifa_magic = IFA_CONTAINER_MAGIC; 2259 ifac->ifa = ifa; 2260 ifac->ifa_refcnt = 1; 2261 } 2262 #ifdef IFADDR_DEBUG 2263 kprintf("alloc ifa %p %d\n", ifa, size); 2264 #endif 2265 return ifa; 2266 } 2267 2268 void 2269 ifac_free(struct ifaddr_container *ifac, int cpu_id) 2270 { 2271 struct ifaddr *ifa = ifac->ifa; 2272 2273 KKASSERT(ifac->ifa_magic == IFA_CONTAINER_MAGIC); 2274 KKASSERT(ifac->ifa_refcnt == 0); 2275 KASSERT(ifac->ifa_listmask == 0, 2276 ("ifa is still on %#x lists\n", ifac->ifa_listmask)); 2277 2278 ifac->ifa_magic = IFA_CONTAINER_DEAD; 2279 2280 #ifdef IFADDR_DEBUG_VERBOSE 2281 kprintf("try free ifa %p cpu_id %d\n", ifac->ifa, cpu_id); 2282 #endif 2283 2284 KASSERT(ifa->ifa_ncnt > 0 && ifa->ifa_ncnt <= ncpus, 2285 ("invalid # of ifac, %d\n", ifa->ifa_ncnt)); 2286 if (atomic_fetchadd_int(&ifa->ifa_ncnt, -1) == 1) { 2287 #ifdef IFADDR_DEBUG 2288 kprintf("free ifa %p\n", ifa); 2289 #endif 2290 kfree(ifa->ifa_containers, M_IFADDR); 2291 kfree(ifa, M_IFADDR); 2292 } 2293 } 2294 2295 static void 2296 ifa_iflink_dispatch(struct netmsg *nmsg) 2297 { 2298 struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg; 2299 struct ifaddr *ifa = msg->ifa; 2300 struct ifnet *ifp = msg->ifp; 2301 int cpu = mycpuid; 2302 struct ifaddr_container *ifac; 2303 2304 crit_enter(); 2305 2306 ifac = &ifa->ifa_containers[cpu]; 2307 ASSERT_IFAC_VALID(ifac); 2308 KASSERT((ifac->ifa_listmask & IFA_LIST_IFADDRHEAD) == 0, 2309 ("ifaddr is on if_addrheads\n")); 2310 2311 ifac->ifa_listmask |= IFA_LIST_IFADDRHEAD; 2312 if (msg->tail) 2313 TAILQ_INSERT_TAIL(&ifp->if_addrheads[cpu], ifac, ifa_link); 2314 else 2315 TAILQ_INSERT_HEAD(&ifp->if_addrheads[cpu], ifac, ifa_link); 2316 2317 crit_exit(); 2318 2319 ifa_forwardmsg(&nmsg->nm_lmsg, cpu + 1); 2320 } 2321 2322 void 2323 ifa_iflink(struct ifaddr *ifa, struct ifnet *ifp, int tail) 2324 { 2325 struct netmsg_ifaddr msg; 2326 2327 netmsg_init(&msg.netmsg, &curthread->td_msgport, 0, 2328 ifa_iflink_dispatch); 2329 msg.ifa = ifa; 2330 msg.ifp = ifp; 2331 msg.tail = tail; 2332 2333 ifa_domsg(&msg.netmsg.nm_lmsg, 0); 2334 } 2335 2336 static void 2337 ifa_ifunlink_dispatch(struct netmsg *nmsg) 2338 { 2339 struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg; 2340 struct ifaddr *ifa = msg->ifa; 2341 struct ifnet *ifp = msg->ifp; 2342 int cpu = mycpuid; 2343 struct ifaddr_container *ifac; 2344 2345 crit_enter(); 2346 2347 ifac = &ifa->ifa_containers[cpu]; 2348 ASSERT_IFAC_VALID(ifac); 2349 KASSERT(ifac->ifa_listmask & IFA_LIST_IFADDRHEAD, 2350 ("ifaddr is not on if_addrhead\n")); 2351 2352 TAILQ_REMOVE(&ifp->if_addrheads[cpu], ifac, ifa_link); 2353 ifac->ifa_listmask &= ~IFA_LIST_IFADDRHEAD; 2354 2355 crit_exit(); 2356 2357 ifa_forwardmsg(&nmsg->nm_lmsg, cpu + 1); 2358 } 2359 2360 void 2361 ifa_ifunlink(struct ifaddr *ifa, struct ifnet *ifp) 2362 { 2363 struct netmsg_ifaddr msg; 2364 2365 netmsg_init(&msg.netmsg, &curthread->td_msgport, 0, 2366 ifa_ifunlink_dispatch); 2367 msg.ifa = ifa; 2368 msg.ifp = ifp; 2369 2370 ifa_domsg(&msg.netmsg.nm_lmsg, 0); 2371 } 2372 2373 static void 2374 ifa_destroy_dispatch(struct netmsg *nmsg) 2375 { 2376 struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg; 2377 2378 IFAFREE(msg->ifa); 2379 ifa_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1); 2380 } 2381 2382 void 2383 ifa_destroy(struct ifaddr *ifa) 2384 { 2385 struct netmsg_ifaddr msg; 2386 2387 netmsg_init(&msg.netmsg, &curthread->td_msgport, 0, 2388 ifa_destroy_dispatch); 2389 msg.ifa = ifa; 2390 2391 ifa_domsg(&msg.netmsg.nm_lmsg, 0); 2392 } 2393 2394 struct lwkt_port * 2395 ifnet_portfn(int cpu) 2396 { 2397 return &ifnet_threads[cpu].td_msgport; 2398 } 2399 2400 void 2401 ifnet_forwardmsg(struct lwkt_msg *lmsg, int next_cpu) 2402 { 2403 KKASSERT(next_cpu > mycpuid && next_cpu <= ncpus); 2404 2405 if (next_cpu < ncpus) 2406 lwkt_forwardmsg(ifnet_portfn(next_cpu), lmsg); 2407 else 2408 lwkt_replymsg(lmsg, 0); 2409 } 2410 2411 int 2412 ifnet_domsg(struct lwkt_msg *lmsg, int cpu) 2413 { 2414 KKASSERT(cpu < ncpus); 2415 return lwkt_domsg(ifnet_portfn(cpu), lmsg, 0); 2416 } 2417 2418 void 2419 ifnet_sendmsg(struct lwkt_msg *lmsg, int cpu) 2420 { 2421 KKASSERT(cpu < ncpus); 2422 lwkt_sendmsg(ifnet_portfn(cpu), lmsg); 2423 } 2424 2425 static void 2426 ifnetinit(void *dummy __unused) 2427 { 2428 int i; 2429 2430 for (i = 0; i < ncpus; ++i) { 2431 struct thread *thr = &ifnet_threads[i]; 2432 2433 lwkt_create(netmsg_service_loop, &ifnet_mpsafe_thread, NULL, 2434 thr, TDF_NETWORK | TDF_MPSAFE, i, "ifnet %d", i); 2435 netmsg_service_port_init(&thr->td_msgport); 2436 } 2437 } 2438