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