Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if.c
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1 /*- 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD: releng/5.4/sys/net/if.c 145094 2005-04-15 01:52:03Z cperciva $ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 #include "opt_mac.h" 37 #include "opt_carp.h" 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/conf.h> 42 #include <sys/mac.h> 43 #include <sys/malloc.h> 44 #include <sys/sbuf.h> 45 #include <sys/bus.h> 46 #include <sys/mbuf.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/sockio.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 #include <sys/taskqueue.h> 57 #include <sys/domain.h> 58 #include <sys/jail.h> 59 #include <machine/stdarg.h> 60 61 #include <net/if.h> 62 #include <net/if_arp.h> 63 #include <net/if_clone.h> 64 #include <net/if_dl.h> 65 #include <net/if_types.h> 66 #include <net/if_var.h> 67 #include <net/radix.h> 68 #include <net/route.h> 69 70 #if defined(INET) || defined(INET6) 71 /*XXX*/ 72 #include <netinet/in.h> 73 #include <netinet/in_var.h> 74 #ifdef INET6 75 #include <netinet6/in6_var.h> 76 #include <netinet6/in6_ifattach.h> 77 #endif 78 #endif 79 #ifdef INET 80 #include <netinet/if_ether.h> 81 #endif 82 #ifdef DEV_CARP 83 #include <netinet/ip_carp.h> 84 #endif 85 86 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 87 88 static void if_attachdomain(void *); 89 static void if_attachdomain1(struct ifnet *); 90 static int ifconf(u_long, caddr_t); 91 static void if_grow(void); 92 static void if_init(void *); 93 static void if_check(void *); 94 static int if_findindex(struct ifnet *); 95 static void if_qflush(struct ifaltq *); 96 static void if_route(struct ifnet *, int flag, int fam); 97 static void if_slowtimo(void *); 98 static void if_unroute(struct ifnet *, int flag, int fam); 99 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 100 static int if_rtdel(struct radix_node *, void *); 101 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 102 static void if_start_deferred(void *context, int pending); 103 #ifdef INET6 104 /* 105 * XXX: declare here to avoid to include many inet6 related files.. 106 * should be more generalized? 107 */ 108 extern void nd6_setmtu(struct ifnet *); 109 #endif 110 111 int if_index = 0; 112 struct ifindex_entry *ifindex_table = NULL; 113 int ifqmaxlen = IFQ_MAXLEN; 114 struct ifnethead ifnet; /* depend on static init XXX */ 115 struct mtx ifnet_lock; 116 117 static int if_indexlim = 8; 118 static struct knlist ifklist; 119 120 static void filt_netdetach(struct knote *kn); 121 static int filt_netdev(struct knote *kn, long hint); 122 123 static struct filterops netdev_filtops = 124 { 1, NULL, filt_netdetach, filt_netdev }; 125 126 /* 127 * System initialization 128 */ 129 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 130 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 131 132 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 133 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 134 135 static d_open_t netopen; 136 static d_close_t netclose; 137 static d_ioctl_t netioctl; 138 static d_kqfilter_t netkqfilter; 139 140 static struct cdevsw net_cdevsw = { 141 .d_version = D_VERSION, 142 .d_flags = D_NEEDGIANT, 143 .d_open = netopen, 144 .d_close = netclose, 145 .d_ioctl = netioctl, 146 .d_name = "net", 147 .d_kqfilter = netkqfilter, 148 }; 149 150 static int 151 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 152 { 153 return (0); 154 } 155 156 static int 157 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 158 { 159 return (0); 160 } 161 162 static int 163 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 164 { 165 struct ifnet *ifp; 166 int error, idx; 167 168 /* only support interface specific ioctls */ 169 if (IOCGROUP(cmd) != 'i') 170 return (EOPNOTSUPP); 171 idx = minor(dev); 172 if (idx == 0) { 173 /* 174 * special network device, not interface. 175 */ 176 if (cmd == SIOCGIFCONF) 177 return (ifconf(cmd, data)); /* XXX remove cmd */ 178 return (EOPNOTSUPP); 179 } 180 181 ifp = ifnet_byindex(idx); 182 if (ifp == NULL) 183 return (ENXIO); 184 185 error = ifhwioctl(cmd, ifp, data, td); 186 if (error == ENOIOCTL) 187 error = EOPNOTSUPP; 188 return (error); 189 } 190 191 static int 192 netkqfilter(struct cdev *dev, struct knote *kn) 193 { 194 struct knlist *klist; 195 struct ifnet *ifp; 196 int idx; 197 198 switch (kn->kn_filter) { 199 case EVFILT_NETDEV: 200 kn->kn_fop = &netdev_filtops; 201 break; 202 default: 203 return (1); 204 } 205 206 idx = minor(dev); 207 if (idx == 0) { 208 klist = &ifklist; 209 } else { 210 ifp = ifnet_byindex(idx); 211 if (ifp == NULL) 212 return (1); 213 klist = &ifp->if_klist; 214 } 215 216 kn->kn_hook = (caddr_t)klist; 217 218 knlist_add(klist, kn, 0); 219 220 return (0); 221 } 222 223 static void 224 filt_netdetach(struct knote *kn) 225 { 226 struct knlist *klist = (struct knlist *)kn->kn_hook; 227 228 knlist_remove(klist, kn, 0); 229 } 230 231 static int 232 filt_netdev(struct knote *kn, long hint) 233 { 234 struct knlist *klist = (struct knlist *)kn->kn_hook; 235 236 /* 237 * Currently NOTE_EXIT is abused to indicate device detach. 238 */ 239 if (hint == NOTE_EXIT) { 240 kn->kn_data = NOTE_LINKINV; 241 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 242 knlist_remove_inevent(klist, kn); 243 return (1); 244 } 245 if (hint != 0) 246 kn->kn_data = hint; /* current status */ 247 if (kn->kn_sfflags & hint) 248 kn->kn_fflags |= hint; 249 return (kn->kn_fflags != 0); 250 } 251 252 /* 253 * Network interface utility routines. 254 * 255 * Routines with ifa_ifwith* names take sockaddr *'s as 256 * parameters. 257 */ 258 /* ARGSUSED*/ 259 static void 260 if_init(void *dummy __unused) 261 { 262 263 IFNET_LOCK_INIT(); 264 TAILQ_INIT(&ifnet); 265 knlist_init(&ifklist, NULL); 266 if_grow(); /* create initial table */ 267 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 268 UID_ROOT, GID_WHEEL, 0600, "network"); 269 if_clone_init(); 270 } 271 272 static void 273 if_grow(void) 274 { 275 u_int n; 276 struct ifindex_entry *e; 277 278 if_indexlim <<= 1; 279 n = if_indexlim * sizeof(*e); 280 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 281 if (ifindex_table != NULL) { 282 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 283 free((caddr_t)ifindex_table, M_IFADDR); 284 } 285 ifindex_table = e; 286 } 287 288 /* ARGSUSED*/ 289 static void 290 if_check(void *dummy __unused) 291 { 292 struct ifnet *ifp; 293 int s; 294 295 s = splimp(); 296 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 297 TAILQ_FOREACH(ifp, &ifnet, if_link) { 298 if (ifp->if_snd.ifq_maxlen == 0) { 299 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 300 ifp->if_snd.ifq_maxlen = ifqmaxlen; 301 } 302 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 303 if_printf(ifp, 304 "XXX: driver didn't initialize queue mtx\n"); 305 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 306 MTX_NETWORK_LOCK, MTX_DEF); 307 } 308 } 309 IFNET_RUNLOCK(); 310 splx(s); 311 if_slowtimo(0); 312 } 313 314 static int 315 if_findindex(struct ifnet *ifp) 316 { 317 int i, unit; 318 char eaddr[18], devname[32]; 319 const char *name, *p; 320 321 switch (ifp->if_type) { 322 case IFT_ETHER: /* these types use struct arpcom */ 323 case IFT_FDDI: 324 case IFT_XETHER: 325 case IFT_ISO88025: 326 case IFT_L2VLAN: 327 snprintf(eaddr, 18, "%6D", IFP2AC(ifp)->ac_enaddr, ":"); 328 break; 329 default: 330 eaddr[0] = '\0'; 331 break; 332 } 333 strlcpy(devname, ifp->if_xname, sizeof(devname)); 334 name = net_cdevsw.d_name; 335 i = 0; 336 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 337 if (resource_string_value(name, unit, "ether", &p) == 0) 338 if (strcmp(p, eaddr) == 0) 339 goto found; 340 if (resource_string_value(name, unit, "dev", &p) == 0) 341 if (strcmp(p, devname) == 0) 342 goto found; 343 } 344 unit = 0; 345 found: 346 if (unit != 0) { 347 if (ifaddr_byindex(unit) == NULL) 348 return (unit); 349 printf("%s%d in use, cannot hardwire it to %s.\n", 350 name, unit, devname); 351 } 352 for (unit = 1; ; unit++) { 353 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 354 continue; 355 if (resource_string_value(name, unit, "ether", &p) == 0 || 356 resource_string_value(name, unit, "dev", &p) == 0) 357 continue; 358 break; 359 } 360 return (unit); 361 } 362 363 /* 364 * Attach an interface to the 365 * list of "active" interfaces. 366 */ 367 void 368 if_attach(struct ifnet *ifp) 369 { 370 unsigned socksize, ifasize; 371 int namelen, masklen; 372 struct sockaddr_dl *sdl; 373 struct ifaddr *ifa; 374 375 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 376 IF_AFDATA_LOCK_INIT(ifp); 377 ifp->if_afdata_initialized = 0; 378 IFNET_WLOCK(); 379 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 380 IFNET_WUNLOCK(); 381 /* 382 * XXX - 383 * The old code would work if the interface passed a pre-existing 384 * chain of ifaddrs to this code. We don't trust our callers to 385 * properly initialize the tailq, however, so we no longer allow 386 * this unlikely case. 387 */ 388 TAILQ_INIT(&ifp->if_addrhead); 389 TAILQ_INIT(&ifp->if_prefixhead); 390 TAILQ_INIT(&ifp->if_multiaddrs); 391 knlist_init(&ifp->if_klist, NULL); 392 getmicrotime(&ifp->if_lastchange); 393 ifp->if_data.ifi_epoch = time_uptime; 394 395 #ifdef MAC 396 mac_init_ifnet(ifp); 397 mac_create_ifnet(ifp); 398 #endif 399 400 ifp->if_index = if_findindex(ifp); 401 if (ifp->if_index > if_index) 402 if_index = ifp->if_index; 403 if (if_index >= if_indexlim) 404 if_grow(); 405 ifp->if_data.ifi_datalen = sizeof(struct if_data); 406 407 ifnet_byindex(ifp->if_index) = ifp; 408 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 409 unit2minor(ifp->if_index), 410 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 411 net_cdevsw.d_name, ifp->if_xname); 412 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 413 net_cdevsw.d_name, ifp->if_index); 414 415 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 416 417 /* 418 * create a Link Level name for this device 419 */ 420 namelen = strlen(ifp->if_xname); 421 /* 422 * Always save enough space for any possiable name so we can do 423 * a rename in place later. 424 */ 425 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 426 socksize = masklen + ifp->if_addrlen; 427 if (socksize < sizeof(*sdl)) 428 socksize = sizeof(*sdl); 429 socksize = roundup2(socksize, sizeof(long)); 430 ifasize = sizeof(*ifa) + 2 * socksize; 431 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 432 IFA_LOCK_INIT(ifa); 433 sdl = (struct sockaddr_dl *)(ifa + 1); 434 sdl->sdl_len = socksize; 435 sdl->sdl_family = AF_LINK; 436 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 437 sdl->sdl_nlen = namelen; 438 sdl->sdl_index = ifp->if_index; 439 sdl->sdl_type = ifp->if_type; 440 ifaddr_byindex(ifp->if_index) = ifa; 441 ifa->ifa_ifp = ifp; 442 ifa->ifa_rtrequest = link_rtrequest; 443 ifa->ifa_addr = (struct sockaddr *)sdl; 444 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 445 ifa->ifa_netmask = (struct sockaddr *)sdl; 446 sdl->sdl_len = masklen; 447 while (namelen != 0) 448 sdl->sdl_data[--namelen] = 0xff; 449 ifa->ifa_refcnt = 1; 450 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 451 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 452 ifp->if_snd.altq_type = 0; 453 ifp->if_snd.altq_disc = NULL; 454 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 455 ifp->if_snd.altq_tbr = NULL; 456 ifp->if_snd.altq_ifp = ifp; 457 458 if (domains) 459 if_attachdomain1(ifp); 460 461 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 462 463 /* Announce the interface. */ 464 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 465 } 466 467 static void 468 if_attachdomain(void *dummy) 469 { 470 struct ifnet *ifp; 471 int s; 472 473 s = splnet(); 474 TAILQ_FOREACH(ifp, &ifnet, if_link) 475 if_attachdomain1(ifp); 476 splx(s); 477 } 478 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 479 if_attachdomain, NULL); 480 481 static void 482 if_attachdomain1(struct ifnet *ifp) 483 { 484 struct domain *dp; 485 int s; 486 487 s = splnet(); 488 489 /* 490 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 491 * cannot lock ifp->if_afdata initialization, entirely. 492 */ 493 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 494 splx(s); 495 return; 496 } 497 if (ifp->if_afdata_initialized) { 498 IF_AFDATA_UNLOCK(ifp); 499 splx(s); 500 return; 501 } 502 ifp->if_afdata_initialized = 1; 503 IF_AFDATA_UNLOCK(ifp); 504 505 /* address family dependent data region */ 506 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 507 for (dp = domains; dp; dp = dp->dom_next) { 508 if (dp->dom_ifattach) 509 ifp->if_afdata[dp->dom_family] = 510 (*dp->dom_ifattach)(ifp); 511 } 512 513 splx(s); 514 } 515 516 /* 517 * Detach an interface, removing it from the 518 * list of "active" interfaces. 519 */ 520 void 521 if_detach(struct ifnet *ifp) 522 { 523 struct ifaddr *ifa, *next; 524 struct radix_node_head *rnh; 525 int s; 526 int i; 527 struct domain *dp; 528 struct ifnet *iter; 529 int found; 530 531 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 532 #ifdef DEV_CARP 533 /* Maybe hook to the generalized departure handler above?!? */ 534 if (ifp->if_carp) 535 carp_ifdetach(ifp); 536 #endif 537 538 /* 539 * Remove routes and flush queues. 540 */ 541 s = splnet(); 542 if_down(ifp); 543 #ifdef ALTQ 544 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 545 altq_disable(&ifp->if_snd); 546 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 547 altq_detach(&ifp->if_snd); 548 #endif 549 550 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) { 551 next = TAILQ_NEXT(ifa, ifa_link); 552 553 if (ifa->ifa_addr->sa_family == AF_LINK) 554 continue; 555 #ifdef INET 556 /* XXX: Ugly!! ad hoc just for INET */ 557 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 558 struct ifaliasreq ifr; 559 560 bzero(&ifr, sizeof(ifr)); 561 ifr.ifra_addr = *ifa->ifa_addr; 562 if (ifa->ifa_dstaddr) 563 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 564 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 565 NULL) == 0) 566 continue; 567 } 568 #endif /* INET */ 569 #ifdef INET6 570 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 571 in6_purgeaddr(ifa); 572 /* ifp_addrhead is already updated */ 573 continue; 574 } 575 #endif /* INET6 */ 576 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 577 IFAFREE(ifa); 578 } 579 580 #ifdef INET6 581 /* 582 * Remove all IPv6 kernel structs related to ifp. This should be done 583 * before removing routing entries below, since IPv6 interface direct 584 * routes are expected to be removed by the IPv6-specific kernel API. 585 * Otherwise, the kernel will detect some inconsistency and bark it. 586 */ 587 in6_ifdetach(ifp); 588 #endif 589 /* 590 * Remove address from ifindex_table[] and maybe decrement if_index. 591 * Clean up all addresses. 592 */ 593 ifnet_byindex(ifp->if_index) = NULL; 594 ifaddr_byindex(ifp->if_index) = NULL; 595 destroy_dev(ifdev_byindex(ifp->if_index)); 596 ifdev_byindex(ifp->if_index) = NULL; 597 598 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 599 if_index--; 600 601 602 /* We can now free link ifaddr. */ 603 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 604 ifa = TAILQ_FIRST(&ifp->if_addrhead); 605 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 606 IFAFREE(ifa); 607 } 608 609 /* 610 * Delete all remaining routes using this interface 611 * Unfortuneatly the only way to do this is to slog through 612 * the entire routing table looking for routes which point 613 * to this interface...oh well... 614 */ 615 for (i = 1; i <= AF_MAX; i++) { 616 if ((rnh = rt_tables[i]) == NULL) 617 continue; 618 RADIX_NODE_HEAD_LOCK(rnh); 619 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 620 RADIX_NODE_HEAD_UNLOCK(rnh); 621 } 622 623 /* Announce that the interface is gone. */ 624 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 625 626 IF_AFDATA_LOCK(ifp); 627 for (dp = domains; dp; dp = dp->dom_next) { 628 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 629 (*dp->dom_ifdetach)(ifp, 630 ifp->if_afdata[dp->dom_family]); 631 } 632 IF_AFDATA_UNLOCK(ifp); 633 634 #ifdef MAC 635 mac_destroy_ifnet(ifp); 636 #endif /* MAC */ 637 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 638 knlist_clear(&ifp->if_klist, 0); 639 knlist_destroy(&ifp->if_klist); 640 IFNET_WLOCK(); 641 found = 0; 642 TAILQ_FOREACH(iter, &ifnet, if_link) 643 if (iter == ifp) { 644 found = 1; 645 break; 646 } 647 if (found) 648 TAILQ_REMOVE(&ifnet, ifp, if_link); 649 IFNET_WUNLOCK(); 650 mtx_destroy(&ifp->if_snd.ifq_mtx); 651 IF_AFDATA_DESTROY(ifp); 652 splx(s); 653 } 654 655 /* 656 * Delete Routes for a Network Interface 657 * 658 * Called for each routing entry via the rnh->rnh_walktree() call above 659 * to delete all route entries referencing a detaching network interface. 660 * 661 * Arguments: 662 * rn pointer to node in the routing table 663 * arg argument passed to rnh->rnh_walktree() - detaching interface 664 * 665 * Returns: 666 * 0 successful 667 * errno failed - reason indicated 668 * 669 */ 670 static int 671 if_rtdel(struct radix_node *rn, void *arg) 672 { 673 struct rtentry *rt = (struct rtentry *)rn; 674 struct ifnet *ifp = arg; 675 int err; 676 677 if (rt->rt_ifp == ifp) { 678 679 /* 680 * Protect (sorta) against walktree recursion problems 681 * with cloned routes 682 */ 683 if ((rt->rt_flags & RTF_UP) == 0) 684 return (0); 685 686 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 687 rt_mask(rt), rt->rt_flags, 688 (struct rtentry **) NULL); 689 if (err) { 690 log(LOG_WARNING, "if_rtdel: error %d\n", err); 691 } 692 } 693 694 return (0); 695 } 696 697 #define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 698 699 /* 700 * Locate an interface based on a complete address. 701 */ 702 /*ARGSUSED*/ 703 struct ifaddr * 704 ifa_ifwithaddr(struct sockaddr *addr) 705 { 706 struct ifnet *ifp; 707 struct ifaddr *ifa; 708 709 IFNET_RLOCK(); 710 TAILQ_FOREACH(ifp, &ifnet, if_link) 711 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 712 if (ifa->ifa_addr->sa_family != addr->sa_family) 713 continue; 714 if (equal(addr, ifa->ifa_addr)) 715 goto done; 716 /* IP6 doesn't have broadcast */ 717 if ((ifp->if_flags & IFF_BROADCAST) && 718 ifa->ifa_broadaddr && 719 ifa->ifa_broadaddr->sa_len != 0 && 720 equal(ifa->ifa_broadaddr, addr)) 721 goto done; 722 } 723 ifa = NULL; 724 done: 725 IFNET_RUNLOCK(); 726 return (ifa); 727 } 728 729 /* 730 * Locate the point to point interface with a given destination address. 731 */ 732 /*ARGSUSED*/ 733 struct ifaddr * 734 ifa_ifwithdstaddr(struct sockaddr *addr) 735 { 736 struct ifnet *ifp; 737 struct ifaddr *ifa; 738 739 IFNET_RLOCK(); 740 TAILQ_FOREACH(ifp, &ifnet, if_link) { 741 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 742 continue; 743 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 744 if (ifa->ifa_addr->sa_family != addr->sa_family) 745 continue; 746 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 747 goto done; 748 } 749 } 750 ifa = NULL; 751 done: 752 IFNET_RUNLOCK(); 753 return (ifa); 754 } 755 756 /* 757 * Find an interface on a specific network. If many, choice 758 * is most specific found. 759 */ 760 struct ifaddr * 761 ifa_ifwithnet(struct sockaddr *addr) 762 { 763 struct ifnet *ifp; 764 struct ifaddr *ifa; 765 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 766 u_int af = addr->sa_family; 767 char *addr_data = addr->sa_data, *cplim; 768 769 /* 770 * AF_LINK addresses can be looked up directly by their index number, 771 * so do that if we can. 772 */ 773 if (af == AF_LINK) { 774 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 775 if (sdl->sdl_index && sdl->sdl_index <= if_index) 776 return (ifaddr_byindex(sdl->sdl_index)); 777 } 778 779 /* 780 * Scan though each interface, looking for ones that have 781 * addresses in this address family. 782 */ 783 IFNET_RLOCK(); 784 TAILQ_FOREACH(ifp, &ifnet, if_link) { 785 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 786 char *cp, *cp2, *cp3; 787 788 if (ifa->ifa_addr->sa_family != af) 789 next: continue; 790 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 791 /* 792 * This is a bit broken as it doesn't 793 * take into account that the remote end may 794 * be a single node in the network we are 795 * looking for. 796 * The trouble is that we don't know the 797 * netmask for the remote end. 798 */ 799 if (ifa->ifa_dstaddr != 0 800 && equal(addr, ifa->ifa_dstaddr)) 801 goto done; 802 } else { 803 /* 804 * if we have a special address handler, 805 * then use it instead of the generic one. 806 */ 807 if (ifa->ifa_claim_addr) { 808 if ((*ifa->ifa_claim_addr)(ifa, addr)) 809 goto done; 810 continue; 811 } 812 813 /* 814 * Scan all the bits in the ifa's address. 815 * If a bit dissagrees with what we are 816 * looking for, mask it with the netmask 817 * to see if it really matters. 818 * (A byte at a time) 819 */ 820 if (ifa->ifa_netmask == 0) 821 continue; 822 cp = addr_data; 823 cp2 = ifa->ifa_addr->sa_data; 824 cp3 = ifa->ifa_netmask->sa_data; 825 cplim = ifa->ifa_netmask->sa_len 826 + (char *)ifa->ifa_netmask; 827 while (cp3 < cplim) 828 if ((*cp++ ^ *cp2++) & *cp3++) 829 goto next; /* next address! */ 830 /* 831 * If the netmask of what we just found 832 * is more specific than what we had before 833 * (if we had one) then remember the new one 834 * before continuing to search 835 * for an even better one. 836 */ 837 if (ifa_maybe == 0 || 838 rn_refines((caddr_t)ifa->ifa_netmask, 839 (caddr_t)ifa_maybe->ifa_netmask)) 840 ifa_maybe = ifa; 841 } 842 } 843 } 844 ifa = ifa_maybe; 845 done: 846 IFNET_RUNLOCK(); 847 return (ifa); 848 } 849 850 /* 851 * Find an interface address specific to an interface best matching 852 * a given address. 853 */ 854 struct ifaddr * 855 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 856 { 857 struct ifaddr *ifa; 858 char *cp, *cp2, *cp3; 859 char *cplim; 860 struct ifaddr *ifa_maybe = 0; 861 u_int af = addr->sa_family; 862 863 if (af >= AF_MAX) 864 return (0); 865 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 866 if (ifa->ifa_addr->sa_family != af) 867 continue; 868 if (ifa_maybe == 0) 869 ifa_maybe = ifa; 870 if (ifa->ifa_netmask == 0) { 871 if (equal(addr, ifa->ifa_addr) || 872 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 873 goto done; 874 continue; 875 } 876 if (ifp->if_flags & IFF_POINTOPOINT) { 877 if (equal(addr, ifa->ifa_dstaddr)) 878 goto done; 879 } else { 880 cp = addr->sa_data; 881 cp2 = ifa->ifa_addr->sa_data; 882 cp3 = ifa->ifa_netmask->sa_data; 883 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 884 for (; cp3 < cplim; cp3++) 885 if ((*cp++ ^ *cp2++) & *cp3) 886 break; 887 if (cp3 == cplim) 888 goto done; 889 } 890 } 891 ifa = ifa_maybe; 892 done: 893 return (ifa); 894 } 895 896 #include <net/route.h> 897 898 /* 899 * Default action when installing a route with a Link Level gateway. 900 * Lookup an appropriate real ifa to point to. 901 * This should be moved to /sys/net/link.c eventually. 902 */ 903 static void 904 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 905 { 906 struct ifaddr *ifa, *oifa; 907 struct sockaddr *dst; 908 struct ifnet *ifp; 909 910 RT_LOCK_ASSERT(rt); 911 912 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 913 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 914 return; 915 ifa = ifaof_ifpforaddr(dst, ifp); 916 if (ifa) { 917 IFAREF(ifa); /* XXX */ 918 oifa = rt->rt_ifa; 919 rt->rt_ifa = ifa; 920 IFAFREE(oifa); 921 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 922 ifa->ifa_rtrequest(cmd, rt, info); 923 } 924 } 925 926 /* 927 * Mark an interface down and notify protocols of 928 * the transition. 929 * NOTE: must be called at splnet or eqivalent. 930 */ 931 static void 932 if_unroute(struct ifnet *ifp, int flag, int fam) 933 { 934 struct ifaddr *ifa; 935 936 ifp->if_flags &= ~flag; 937 getmicrotime(&ifp->if_lastchange); 938 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 939 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 940 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 941 if_qflush(&ifp->if_snd); 942 #ifdef DEV_CARP 943 if (ifp->if_carp) 944 carp_carpdev_state(ifp->if_carp); 945 #endif 946 rt_ifmsg(ifp); 947 } 948 949 /* 950 * Mark an interface up and notify protocols of 951 * the transition. 952 * NOTE: must be called at splnet or eqivalent. 953 */ 954 static void 955 if_route(struct ifnet *ifp, int flag, int fam) 956 { 957 struct ifaddr *ifa; 958 959 ifp->if_flags |= flag; 960 getmicrotime(&ifp->if_lastchange); 961 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 962 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 963 pfctlinput(PRC_IFUP, ifa->ifa_addr); 964 #ifdef DEV_CARP 965 if (ifp->if_carp) 966 carp_carpdev_state(ifp->if_carp); 967 #endif 968 rt_ifmsg(ifp); 969 #ifdef INET6 970 in6_if_up(ifp); 971 #endif 972 } 973 974 /* 975 * Mark an interface down and notify protocols of 976 * the transition. 977 * NOTE: must be called at splnet or eqivalent. 978 */ 979 void 980 if_down(struct ifnet *ifp) 981 { 982 983 if_unroute(ifp, IFF_UP, AF_UNSPEC); 984 } 985 986 /* 987 * Mark an interface up and notify protocols of 988 * the transition. 989 * NOTE: must be called at splnet or eqivalent. 990 */ 991 void 992 if_up(struct ifnet *ifp) 993 { 994 995 if_route(ifp, IFF_UP, AF_UNSPEC); 996 } 997 998 /* 999 * Flush an interface queue. 1000 */ 1001 static void 1002 if_qflush(struct ifaltq *ifq) 1003 { 1004 struct mbuf *m, *n; 1005 1006 IFQ_LOCK(ifq); 1007 #ifdef ALTQ 1008 if (ALTQ_IS_ENABLED(ifq)) 1009 ALTQ_PURGE(ifq); 1010 #endif 1011 n = ifq->ifq_head; 1012 while ((m = n) != 0) { 1013 n = m->m_act; 1014 m_freem(m); 1015 } 1016 ifq->ifq_head = 0; 1017 ifq->ifq_tail = 0; 1018 ifq->ifq_len = 0; 1019 IFQ_UNLOCK(ifq); 1020 } 1021 1022 /* 1023 * Handle interface watchdog timer routines. Called 1024 * from softclock, we decrement timers (if set) and 1025 * call the appropriate interface routine on expiration. 1026 * 1027 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1028 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1029 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1030 */ 1031 static void 1032 if_slowtimo(void *arg) 1033 { 1034 struct ifnet *ifp; 1035 int s = splimp(); 1036 1037 IFNET_RLOCK(); 1038 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1039 if (ifp->if_timer == 0 || --ifp->if_timer) 1040 continue; 1041 if (ifp->if_watchdog) 1042 (*ifp->if_watchdog)(ifp); 1043 } 1044 IFNET_RUNLOCK(); 1045 splx(s); 1046 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1047 } 1048 1049 /* 1050 * Map interface name to 1051 * interface structure pointer. 1052 */ 1053 struct ifnet * 1054 ifunit(const char *name) 1055 { 1056 struct ifnet *ifp; 1057 1058 IFNET_RLOCK(); 1059 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1060 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1061 break; 1062 } 1063 IFNET_RUNLOCK(); 1064 return (ifp); 1065 } 1066 1067 /* 1068 * Hardware specific interface ioctls. 1069 */ 1070 static int 1071 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1072 { 1073 struct ifreq *ifr; 1074 struct ifstat *ifs; 1075 int error = 0; 1076 int new_flags; 1077 size_t namelen, onamelen; 1078 char new_name[IFNAMSIZ]; 1079 struct ifaddr *ifa; 1080 struct sockaddr_dl *sdl; 1081 1082 ifr = (struct ifreq *)data; 1083 switch (cmd) { 1084 case SIOCGIFINDEX: 1085 ifr->ifr_index = ifp->if_index; 1086 break; 1087 1088 case SIOCGIFFLAGS: 1089 ifr->ifr_flags = ifp->if_flags & 0xffff; 1090 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1091 break; 1092 1093 case SIOCGIFCAP: 1094 ifr->ifr_reqcap = ifp->if_capabilities; 1095 ifr->ifr_curcap = ifp->if_capenable; 1096 break; 1097 1098 #ifdef MAC 1099 case SIOCGIFMAC: 1100 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1101 break; 1102 #endif 1103 1104 case SIOCGIFMETRIC: 1105 ifr->ifr_metric = ifp->if_metric; 1106 break; 1107 1108 case SIOCGIFMTU: 1109 ifr->ifr_mtu = ifp->if_mtu; 1110 break; 1111 1112 case SIOCGIFPHYS: 1113 ifr->ifr_phys = ifp->if_physical; 1114 break; 1115 1116 case SIOCSIFFLAGS: 1117 error = suser(td); 1118 if (error) 1119 return (error); 1120 new_flags = (ifr->ifr_flags & 0xffff) | 1121 (ifr->ifr_flagshigh << 16); 1122 if (ifp->if_flags & IFF_SMART) { 1123 /* Smart drivers twiddle their own routes */ 1124 } else if (ifp->if_flags & IFF_UP && 1125 (new_flags & IFF_UP) == 0) { 1126 int s = splimp(); 1127 if_down(ifp); 1128 splx(s); 1129 } else if (new_flags & IFF_UP && 1130 (ifp->if_flags & IFF_UP) == 0) { 1131 int s = splimp(); 1132 if_up(ifp); 1133 splx(s); 1134 } 1135 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1136 (new_flags &~ IFF_CANTCHANGE); 1137 if (new_flags & IFF_PPROMISC) { 1138 /* Permanently promiscuous mode requested */ 1139 ifp->if_flags |= IFF_PROMISC; 1140 } else if (ifp->if_pcount == 0) { 1141 ifp->if_flags &= ~IFF_PROMISC; 1142 } 1143 if (ifp->if_ioctl) { 1144 IFF_LOCKGIANT(ifp); 1145 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1146 IFF_UNLOCKGIANT(ifp); 1147 } 1148 getmicrotime(&ifp->if_lastchange); 1149 break; 1150 1151 case SIOCSIFCAP: 1152 error = suser(td); 1153 if (error) 1154 return (error); 1155 if (ifp->if_ioctl == NULL) 1156 return (EOPNOTSUPP); 1157 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1158 return (EINVAL); 1159 IFF_LOCKGIANT(ifp); 1160 error = (*ifp->if_ioctl)(ifp, cmd, data); 1161 IFF_UNLOCKGIANT(ifp); 1162 if (error == 0) 1163 getmicrotime(&ifp->if_lastchange); 1164 break; 1165 1166 #ifdef MAC 1167 case SIOCSIFMAC: 1168 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1169 break; 1170 #endif 1171 1172 case SIOCSIFNAME: 1173 error = suser(td); 1174 if (error != 0) 1175 return (error); 1176 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1177 if (error != 0) 1178 return (error); 1179 if (new_name[0] == '\0') 1180 return (EINVAL); 1181 if (ifunit(new_name) != NULL) 1182 return (EEXIST); 1183 1184 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1185 /* Announce the departure of the interface. */ 1186 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1187 1188 log(LOG_INFO, "%s: changing name to '%s'\n", 1189 ifp->if_xname, new_name); 1190 1191 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1192 ifa = ifaddr_byindex(ifp->if_index); 1193 IFA_LOCK(ifa); 1194 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1195 namelen = strlen(new_name); 1196 onamelen = sdl->sdl_nlen; 1197 /* 1198 * Move the address if needed. This is safe because we 1199 * allocate space for a name of length IFNAMSIZ when we 1200 * create this in if_attach(). 1201 */ 1202 if (namelen != onamelen) { 1203 bcopy(sdl->sdl_data + onamelen, 1204 sdl->sdl_data + namelen, sdl->sdl_alen); 1205 } 1206 bcopy(new_name, sdl->sdl_data, namelen); 1207 sdl->sdl_nlen = namelen; 1208 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1209 bzero(sdl->sdl_data, onamelen); 1210 while (namelen != 0) 1211 sdl->sdl_data[--namelen] = 0xff; 1212 IFA_UNLOCK(ifa); 1213 1214 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1215 /* Announce the return of the interface. */ 1216 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1217 break; 1218 1219 case SIOCSIFMETRIC: 1220 error = suser(td); 1221 if (error) 1222 return (error); 1223 ifp->if_metric = ifr->ifr_metric; 1224 getmicrotime(&ifp->if_lastchange); 1225 break; 1226 1227 case SIOCSIFPHYS: 1228 error = suser(td); 1229 if (error) 1230 return (error); 1231 if (ifp->if_ioctl == NULL) 1232 return (EOPNOTSUPP); 1233 IFF_LOCKGIANT(ifp); 1234 error = (*ifp->if_ioctl)(ifp, cmd, data); 1235 IFF_UNLOCKGIANT(ifp); 1236 if (error == 0) 1237 getmicrotime(&ifp->if_lastchange); 1238 break; 1239 1240 case SIOCSIFMTU: 1241 { 1242 u_long oldmtu = ifp->if_mtu; 1243 1244 error = suser(td); 1245 if (error) 1246 return (error); 1247 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1248 return (EINVAL); 1249 if (ifp->if_ioctl == NULL) 1250 return (EOPNOTSUPP); 1251 IFF_LOCKGIANT(ifp); 1252 error = (*ifp->if_ioctl)(ifp, cmd, data); 1253 IFF_UNLOCKGIANT(ifp); 1254 if (error == 0) { 1255 getmicrotime(&ifp->if_lastchange); 1256 rt_ifmsg(ifp); 1257 } 1258 /* 1259 * If the link MTU changed, do network layer specific procedure. 1260 */ 1261 if (ifp->if_mtu != oldmtu) { 1262 #ifdef INET6 1263 nd6_setmtu(ifp); 1264 #endif 1265 } 1266 break; 1267 } 1268 1269 case SIOCADDMULTI: 1270 case SIOCDELMULTI: 1271 error = suser(td); 1272 if (error) 1273 return (error); 1274 1275 /* Don't allow group membership on non-multicast interfaces. */ 1276 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1277 return (EOPNOTSUPP); 1278 1279 /* Don't let users screw up protocols' entries. */ 1280 if (ifr->ifr_addr.sa_family != AF_LINK) 1281 return (EINVAL); 1282 1283 if (cmd == SIOCADDMULTI) { 1284 struct ifmultiaddr *ifma; 1285 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1286 } else { 1287 error = if_delmulti(ifp, &ifr->ifr_addr); 1288 } 1289 if (error == 0) 1290 getmicrotime(&ifp->if_lastchange); 1291 break; 1292 1293 case SIOCSIFPHYADDR: 1294 case SIOCDIFPHYADDR: 1295 #ifdef INET6 1296 case SIOCSIFPHYADDR_IN6: 1297 #endif 1298 case SIOCSLIFPHYADDR: 1299 case SIOCSIFMEDIA: 1300 case SIOCSIFGENERIC: 1301 error = suser(td); 1302 if (error) 1303 return (error); 1304 if (ifp->if_ioctl == NULL) 1305 return (EOPNOTSUPP); 1306 IFF_LOCKGIANT(ifp); 1307 error = (*ifp->if_ioctl)(ifp, cmd, data); 1308 IFF_UNLOCKGIANT(ifp); 1309 if (error == 0) 1310 getmicrotime(&ifp->if_lastchange); 1311 break; 1312 1313 case SIOCGIFSTATUS: 1314 ifs = (struct ifstat *)data; 1315 ifs->ascii[0] = '\0'; 1316 1317 case SIOCGIFPSRCADDR: 1318 case SIOCGIFPDSTADDR: 1319 case SIOCGLIFPHYADDR: 1320 case SIOCGIFMEDIA: 1321 case SIOCGIFGENERIC: 1322 if (ifp->if_ioctl == NULL) 1323 return (EOPNOTSUPP); 1324 IFF_LOCKGIANT(ifp); 1325 error = (*ifp->if_ioctl)(ifp, cmd, data); 1326 IFF_UNLOCKGIANT(ifp); 1327 break; 1328 1329 case SIOCSIFLLADDR: 1330 error = suser(td); 1331 if (error) 1332 return (error); 1333 error = if_setlladdr(ifp, 1334 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1335 break; 1336 1337 default: 1338 error = ENOIOCTL; 1339 break; 1340 } 1341 return (error); 1342 } 1343 1344 /* 1345 * Interface ioctls. 1346 */ 1347 int 1348 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1349 { 1350 struct ifnet *ifp; 1351 struct ifreq *ifr; 1352 int error; 1353 int oif_flags; 1354 1355 switch (cmd) { 1356 case SIOCGIFCONF: 1357 case OSIOCGIFCONF: 1358 return (ifconf(cmd, data)); 1359 } 1360 ifr = (struct ifreq *)data; 1361 1362 switch (cmd) { 1363 case SIOCIFCREATE: 1364 case SIOCIFDESTROY: 1365 if ((error = suser(td)) != 0) 1366 return (error); 1367 return ((cmd == SIOCIFCREATE) ? 1368 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1369 if_clone_destroy(ifr->ifr_name)); 1370 1371 case SIOCIFGCLONERS: 1372 return (if_clone_list((struct if_clonereq *)data)); 1373 } 1374 1375 ifp = ifunit(ifr->ifr_name); 1376 if (ifp == 0) 1377 return (ENXIO); 1378 1379 error = ifhwioctl(cmd, ifp, data, td); 1380 if (error != ENOIOCTL) 1381 return (error); 1382 1383 oif_flags = ifp->if_flags; 1384 if (so->so_proto == 0) 1385 return (EOPNOTSUPP); 1386 #ifndef COMPAT_43 1387 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1388 data, 1389 ifp, td)); 1390 #else 1391 { 1392 int ocmd = cmd; 1393 1394 switch (cmd) { 1395 1396 case SIOCSIFDSTADDR: 1397 case SIOCSIFADDR: 1398 case SIOCSIFBRDADDR: 1399 case SIOCSIFNETMASK: 1400 #if BYTE_ORDER != BIG_ENDIAN 1401 if (ifr->ifr_addr.sa_family == 0 && 1402 ifr->ifr_addr.sa_len < 16) { 1403 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1404 ifr->ifr_addr.sa_len = 16; 1405 } 1406 #else 1407 if (ifr->ifr_addr.sa_len == 0) 1408 ifr->ifr_addr.sa_len = 16; 1409 #endif 1410 break; 1411 1412 case OSIOCGIFADDR: 1413 cmd = SIOCGIFADDR; 1414 break; 1415 1416 case OSIOCGIFDSTADDR: 1417 cmd = SIOCGIFDSTADDR; 1418 break; 1419 1420 case OSIOCGIFBRDADDR: 1421 cmd = SIOCGIFBRDADDR; 1422 break; 1423 1424 case OSIOCGIFNETMASK: 1425 cmd = SIOCGIFNETMASK; 1426 } 1427 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1428 cmd, 1429 data, 1430 ifp, td)); 1431 switch (ocmd) { 1432 1433 case OSIOCGIFADDR: 1434 case OSIOCGIFDSTADDR: 1435 case OSIOCGIFBRDADDR: 1436 case OSIOCGIFNETMASK: 1437 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1438 1439 } 1440 } 1441 #endif /* COMPAT_43 */ 1442 1443 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1444 #ifdef INET6 1445 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1446 if (ifp->if_flags & IFF_UP) { 1447 int s = splimp(); 1448 in6_if_up(ifp); 1449 splx(s); 1450 } 1451 #endif 1452 } 1453 return (error); 1454 } 1455 1456 /* 1457 * Set/clear promiscuous mode on interface ifp based on the truth value 1458 * of pswitch. The calls are reference counted so that only the first 1459 * "on" request actually has an effect, as does the final "off" request. 1460 * Results are undefined if the "off" and "on" requests are not matched. 1461 */ 1462 int 1463 ifpromisc(struct ifnet *ifp, int pswitch) 1464 { 1465 struct ifreq ifr; 1466 int error; 1467 int oldflags, oldpcount; 1468 1469 oldpcount = ifp->if_pcount; 1470 oldflags = ifp->if_flags; 1471 if (ifp->if_flags & IFF_PPROMISC) { 1472 /* Do nothing if device is in permanently promiscuous mode */ 1473 ifp->if_pcount += pswitch ? 1 : -1; 1474 return (0); 1475 } 1476 if (pswitch) { 1477 /* 1478 * If the device is not configured up, we cannot put it in 1479 * promiscuous mode. 1480 */ 1481 if ((ifp->if_flags & IFF_UP) == 0) 1482 return (ENETDOWN); 1483 if (ifp->if_pcount++ != 0) 1484 return (0); 1485 ifp->if_flags |= IFF_PROMISC; 1486 } else { 1487 if (--ifp->if_pcount > 0) 1488 return (0); 1489 ifp->if_flags &= ~IFF_PROMISC; 1490 } 1491 ifr.ifr_flags = ifp->if_flags & 0xffff; 1492 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1493 IFF_LOCKGIANT(ifp); 1494 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1495 IFF_UNLOCKGIANT(ifp); 1496 if (error == 0) { 1497 log(LOG_INFO, "%s: promiscuous mode %s\n", 1498 ifp->if_xname, 1499 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1500 rt_ifmsg(ifp); 1501 } else { 1502 ifp->if_pcount = oldpcount; 1503 ifp->if_flags = oldflags; 1504 } 1505 return error; 1506 } 1507 1508 /* 1509 * Return interface configuration 1510 * of system. List may be used 1511 * in later ioctl's (above) to get 1512 * other information. 1513 */ 1514 /*ARGSUSED*/ 1515 static int 1516 ifconf(u_long cmd, caddr_t data) 1517 { 1518 struct ifconf *ifc = (struct ifconf *)data; 1519 struct ifnet *ifp; 1520 struct ifaddr *ifa; 1521 struct ifreq ifr; 1522 struct sbuf *sb; 1523 int error, full = 0, valid_len, max_len; 1524 1525 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1526 max_len = MAXPHYS - 1; 1527 1528 /* Prevent hostile input from being able to crash the system */ 1529 if (ifc->ifc_len <= 0) 1530 return (EINVAL); 1531 1532 again: 1533 if (ifc->ifc_len <= max_len) { 1534 max_len = ifc->ifc_len; 1535 full = 1; 1536 } 1537 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1538 max_len = 0; 1539 valid_len = 0; 1540 1541 IFNET_RLOCK(); /* could sleep XXX */ 1542 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1543 int addrs; 1544 1545 /* 1546 * Zero the ifr_name buffer to make sure we don't 1547 * disclose the contents of the stack. 1548 */ 1549 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1550 1551 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1552 >= sizeof(ifr.ifr_name)) 1553 return (ENAMETOOLONG); 1554 1555 addrs = 0; 1556 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1557 struct sockaddr *sa = ifa->ifa_addr; 1558 1559 if (jailed(curthread->td_ucred) && 1560 prison_if(curthread->td_ucred, sa)) 1561 continue; 1562 addrs++; 1563 #ifdef COMPAT_43 1564 if (cmd == OSIOCGIFCONF) { 1565 struct osockaddr *osa = 1566 (struct osockaddr *)&ifr.ifr_addr; 1567 ifr.ifr_addr = *sa; 1568 osa->sa_family = sa->sa_family; 1569 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1570 max_len += sizeof(ifr); 1571 } else 1572 #endif 1573 if (sa->sa_len <= sizeof(*sa)) { 1574 ifr.ifr_addr = *sa; 1575 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1576 max_len += sizeof(ifr); 1577 } else { 1578 sbuf_bcat(sb, &ifr, 1579 offsetof(struct ifreq, ifr_addr)); 1580 max_len += offsetof(struct ifreq, ifr_addr); 1581 sbuf_bcat(sb, sa, sa->sa_len); 1582 max_len += sa->sa_len; 1583 } 1584 1585 if (!sbuf_overflowed(sb)) 1586 valid_len = sbuf_len(sb); 1587 } 1588 if (addrs == 0) { 1589 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1590 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1591 max_len += sizeof(ifr); 1592 1593 if (!sbuf_overflowed(sb)) 1594 valid_len = sbuf_len(sb); 1595 } 1596 } 1597 IFNET_RUNLOCK(); 1598 1599 /* 1600 * If we didn't allocate enough space (uncommon), try again. If 1601 * we have already allocated as much space as we are allowed, 1602 * return what we've got. 1603 */ 1604 if (valid_len != max_len && !full) { 1605 sbuf_delete(sb); 1606 goto again; 1607 } 1608 1609 ifc->ifc_len = valid_len; 1610 sbuf_finish(sb); 1611 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1612 sbuf_delete(sb); 1613 return (error); 1614 } 1615 1616 /* 1617 * Just like if_promisc(), but for all-multicast-reception mode. 1618 */ 1619 int 1620 if_allmulti(struct ifnet *ifp, int onswitch) 1621 { 1622 int error = 0; 1623 int s = splimp(); 1624 struct ifreq ifr; 1625 1626 if (onswitch) { 1627 if (ifp->if_amcount++ == 0) { 1628 ifp->if_flags |= IFF_ALLMULTI; 1629 ifr.ifr_flags = ifp->if_flags & 0xffff; 1630 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1631 IFF_LOCKGIANT(ifp); 1632 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1633 IFF_UNLOCKGIANT(ifp); 1634 } 1635 } else { 1636 if (ifp->if_amcount > 1) { 1637 ifp->if_amcount--; 1638 } else { 1639 ifp->if_amcount = 0; 1640 ifp->if_flags &= ~IFF_ALLMULTI; 1641 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1642 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1643 IFF_LOCKGIANT(ifp); 1644 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1645 IFF_UNLOCKGIANT(ifp); 1646 } 1647 } 1648 splx(s); 1649 1650 if (error == 0) 1651 rt_ifmsg(ifp); 1652 return error; 1653 } 1654 1655 /* 1656 * Add a multicast listenership to the interface in question. 1657 * The link layer provides a routine which converts 1658 */ 1659 int 1660 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1661 { 1662 struct sockaddr *llsa, *dupsa; 1663 int error, s; 1664 struct ifmultiaddr *ifma; 1665 1666 /* 1667 * If the matching multicast address already exists 1668 * then don't add a new one, just add a reference 1669 */ 1670 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1671 if (equal(sa, ifma->ifma_addr)) { 1672 ifma->ifma_refcount++; 1673 if (retifma) 1674 *retifma = ifma; 1675 return 0; 1676 } 1677 } 1678 1679 /* 1680 * Give the link layer a chance to accept/reject it, and also 1681 * find out which AF_LINK address this maps to, if it isn't one 1682 * already. 1683 */ 1684 if (ifp->if_resolvemulti) { 1685 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1686 if (error) return error; 1687 } else { 1688 llsa = 0; 1689 } 1690 1691 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1692 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1693 bcopy(sa, dupsa, sa->sa_len); 1694 1695 ifma->ifma_addr = dupsa; 1696 ifma->ifma_lladdr = llsa; 1697 ifma->ifma_ifp = ifp; 1698 ifma->ifma_refcount = 1; 1699 ifma->ifma_protospec = 0; 1700 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1701 1702 /* 1703 * Some network interfaces can scan the address list at 1704 * interrupt time; lock them out. 1705 */ 1706 s = splimp(); 1707 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1708 splx(s); 1709 if (retifma != NULL) 1710 *retifma = ifma; 1711 1712 if (llsa != 0) { 1713 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1714 if (equal(ifma->ifma_addr, llsa)) 1715 break; 1716 } 1717 if (ifma) { 1718 ifma->ifma_refcount++; 1719 } else { 1720 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1721 M_IFMADDR, M_WAITOK); 1722 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1723 M_IFMADDR, M_WAITOK); 1724 bcopy(llsa, dupsa, llsa->sa_len); 1725 ifma->ifma_addr = dupsa; 1726 ifma->ifma_lladdr = NULL; 1727 ifma->ifma_ifp = ifp; 1728 ifma->ifma_refcount = 1; 1729 ifma->ifma_protospec = 0; 1730 s = splimp(); 1731 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1732 splx(s); 1733 } 1734 } 1735 /* 1736 * We are certain we have added something, so call down to the 1737 * interface to let them know about it. 1738 */ 1739 s = splimp(); 1740 IFF_LOCKGIANT(ifp); 1741 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1742 IFF_UNLOCKGIANT(ifp); 1743 splx(s); 1744 1745 return 0; 1746 } 1747 1748 /* 1749 * Remove a reference to a multicast address on this interface. Yell 1750 * if the request does not match an existing membership. 1751 */ 1752 int 1753 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1754 { 1755 struct ifmultiaddr *ifma; 1756 int s; 1757 1758 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1759 if (equal(sa, ifma->ifma_addr)) 1760 break; 1761 if (ifma == 0) 1762 return ENOENT; 1763 1764 if (ifma->ifma_refcount > 1) { 1765 ifma->ifma_refcount--; 1766 return 0; 1767 } 1768 1769 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1770 sa = ifma->ifma_lladdr; 1771 s = splimp(); 1772 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1773 /* 1774 * Make sure the interface driver is notified 1775 * in the case of a link layer mcast group being left. 1776 */ 1777 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) { 1778 IFF_LOCKGIANT(ifp); 1779 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1780 IFF_UNLOCKGIANT(ifp); 1781 } 1782 splx(s); 1783 free(ifma->ifma_addr, M_IFMADDR); 1784 free(ifma, M_IFMADDR); 1785 if (sa == 0) 1786 return 0; 1787 1788 /* 1789 * Now look for the link-layer address which corresponds to 1790 * this network address. It had been squirreled away in 1791 * ifma->ifma_lladdr for this purpose (so we don't have 1792 * to call ifp->if_resolvemulti() again), and we saved that 1793 * value in sa above. If some nasty deleted the 1794 * link-layer address out from underneath us, we can deal because 1795 * the address we stored was is not the same as the one which was 1796 * in the record for the link-layer address. (So we don't complain 1797 * in that case.) 1798 */ 1799 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1800 if (equal(sa, ifma->ifma_addr)) 1801 break; 1802 if (ifma == 0) 1803 return 0; 1804 1805 if (ifma->ifma_refcount > 1) { 1806 ifma->ifma_refcount--; 1807 return 0; 1808 } 1809 1810 s = splimp(); 1811 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1812 IFF_LOCKGIANT(ifp); 1813 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1814 IFF_UNLOCKGIANT(ifp); 1815 splx(s); 1816 free(ifma->ifma_addr, M_IFMADDR); 1817 free(sa, M_IFMADDR); 1818 free(ifma, M_IFMADDR); 1819 1820 return 0; 1821 } 1822 1823 /* 1824 * Set the link layer address on an interface. 1825 * 1826 * At this time we only support certain types of interfaces, 1827 * and we don't allow the length of the address to change. 1828 */ 1829 int 1830 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1831 { 1832 struct sockaddr_dl *sdl; 1833 struct ifaddr *ifa; 1834 struct ifreq ifr; 1835 1836 ifa = ifaddr_byindex(ifp->if_index); 1837 if (ifa == NULL) 1838 return (EINVAL); 1839 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1840 if (sdl == NULL) 1841 return (EINVAL); 1842 if (len != sdl->sdl_alen) /* don't allow length to change */ 1843 return (EINVAL); 1844 switch (ifp->if_type) { 1845 case IFT_ETHER: /* these types use struct arpcom */ 1846 case IFT_FDDI: 1847 case IFT_XETHER: 1848 case IFT_ISO88025: 1849 case IFT_L2VLAN: 1850 bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len); 1851 /* 1852 * XXX We also need to store the lladdr in LLADDR(sdl), 1853 * which is done below. This is a pain because we must 1854 * remember to keep the info in sync. 1855 */ 1856 /* FALLTHROUGH */ 1857 case IFT_ARCNET: 1858 bcopy(lladdr, LLADDR(sdl), len); 1859 break; 1860 default: 1861 return (ENODEV); 1862 } 1863 /* 1864 * If the interface is already up, we need 1865 * to re-init it in order to reprogram its 1866 * address filter. 1867 */ 1868 if ((ifp->if_flags & IFF_UP) != 0) { 1869 IFF_LOCKGIANT(ifp); 1870 ifp->if_flags &= ~IFF_UP; 1871 ifr.ifr_flags = ifp->if_flags & 0xffff; 1872 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1873 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1874 ifp->if_flags |= IFF_UP; 1875 ifr.ifr_flags = ifp->if_flags & 0xffff; 1876 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1877 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1878 IFF_UNLOCKGIANT(ifp); 1879 #ifdef INET 1880 /* 1881 * Also send gratuitous ARPs to notify other nodes about 1882 * the address change. 1883 */ 1884 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1885 if (ifa->ifa_addr != NULL && 1886 ifa->ifa_addr->sa_family == AF_INET) 1887 arp_ifinit(ifp, ifa); 1888 } 1889 #endif 1890 } 1891 return (0); 1892 } 1893 1894 struct ifmultiaddr * 1895 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1896 { 1897 struct ifmultiaddr *ifma; 1898 1899 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1900 if (equal(ifma->ifma_addr, sa)) 1901 break; 1902 1903 return ifma; 1904 } 1905 1906 /* 1907 * The name argument must be a pointer to storage which will last as 1908 * long as the interface does. For physical devices, the result of 1909 * device_get_name(dev) is a good choice and for pseudo-devices a 1910 * static string works well. 1911 */ 1912 void 1913 if_initname(struct ifnet *ifp, const char *name, int unit) 1914 { 1915 ifp->if_dname = name; 1916 ifp->if_dunit = unit; 1917 if (unit != IF_DUNIT_NONE) 1918 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1919 else 1920 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1921 } 1922 1923 int 1924 if_printf(struct ifnet *ifp, const char * fmt, ...) 1925 { 1926 va_list ap; 1927 int retval; 1928 1929 retval = printf("%s: ", ifp->if_xname); 1930 va_start(ap, fmt); 1931 retval += vprintf(fmt, ap); 1932 va_end(ap); 1933 return (retval); 1934 } 1935 1936 /* 1937 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 1938 * be called without Giant. However, we often can't acquire the Giant lock 1939 * at those points; instead, we run it via a task queue that holds Giant via 1940 * if_start_deferred. 1941 * 1942 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 1943 * outstanding if_start_deferred() tasks that will run after the free. This 1944 * probably means waiting in if_detach(). 1945 */ 1946 void 1947 if_start(struct ifnet *ifp) 1948 { 1949 1950 NET_ASSERT_GIANT(); 1951 1952 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 1953 if (mtx_owned(&Giant)) 1954 (*(ifp)->if_start)(ifp); 1955 else 1956 taskqueue_enqueue(taskqueue_swi_giant, 1957 &ifp->if_starttask); 1958 } else 1959 (*(ifp)->if_start)(ifp); 1960 } 1961 1962 static void 1963 if_start_deferred(void *context, int pending) 1964 { 1965 struct ifnet *ifp; 1966 1967 /* 1968 * This code must be entered with Giant, and should never run if 1969 * we're not running with debug.mpsafenet. 1970 */ 1971 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 1972 GIANT_REQUIRED; 1973 1974 ifp = (struct ifnet *)context; 1975 (ifp->if_start)(ifp); 1976 } 1977 1978 int 1979 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 1980 { 1981 int active = 0; 1982 1983 IF_LOCK(ifq); 1984 if (_IF_QFULL(ifq)) { 1985 _IF_DROP(ifq); 1986 IF_UNLOCK(ifq); 1987 m_freem(m); 1988 return (0); 1989 } 1990 if (ifp != NULL) { 1991 ifp->if_obytes += m->m_pkthdr.len + adjust; 1992 if (m->m_flags & (M_BCAST|M_MCAST)) 1993 ifp->if_omcasts++; 1994 active = ifp->if_flags & IFF_OACTIVE; 1995 } 1996 _IF_ENQUEUE(ifq, m); 1997 IF_UNLOCK(ifq); 1998 if (ifp != NULL && !active) 1999 if_start(ifp); 2000 return (1); 2001 } 2002 2003 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 2004 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
Cache object: 97a27e5a4c154c98ea9e8a4a944950c1
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