if.c revision 1.292
1 /* $NetBSD: if.c,v 1.292 2014/11/07 12:57:42 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000, 2001, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by William Studenmund and Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the project nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 */ 60 61 /* 62 * Copyright (c) 1980, 1986, 1993 63 * The Regents of the University of California. All rights reserved. 64 * 65 * Redistribution and use in source and binary forms, with or without 66 * modification, are permitted provided that the following conditions 67 * are met: 68 * 1. Redistributions of source code must retain the above copyright 69 * notice, this list of conditions and the following disclaimer. 70 * 2. Redistributions in binary form must reproduce the above copyright 71 * notice, this list of conditions and the following disclaimer in the 72 * documentation and/or other materials provided with the distribution. 73 * 3. Neither the name of the University nor the names of its contributors 74 * may be used to endorse or promote products derived from this software 75 * without specific prior written permission. 76 * 77 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 80 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 87 * SUCH DAMAGE. 88 * 89 * @(#)if.c 8.5 (Berkeley) 1/9/95 90 */ 91 92 #include <sys/cdefs.h> 93 __KERNEL_RCSID(0, "$NetBSD: if.c,v 1.292 2014/11/07 12:57:42 christos Exp $"); 94 95 #include "opt_inet.h" 96 97 #include "opt_atalk.h" 98 #include "opt_natm.h" 99 #include "opt_wlan.h" 100 101 #include <sys/param.h> 102 #include <sys/mbuf.h> 103 #include <sys/systm.h> 104 #include <sys/callout.h> 105 #include <sys/proc.h> 106 #include <sys/socket.h> 107 #include <sys/socketvar.h> 108 #include <sys/domain.h> 109 #include <sys/protosw.h> 110 #include <sys/kernel.h> 111 #include <sys/ioctl.h> 112 #include <sys/sysctl.h> 113 #include <sys/syslog.h> 114 #include <sys/kauth.h> 115 #include <sys/kmem.h> 116 #include <sys/xcall.h> 117 118 #include <net/if.h> 119 #include <net/if_dl.h> 120 #include <net/if_ether.h> 121 #include <net/if_media.h> 122 #include <net80211/ieee80211.h> 123 #include <net80211/ieee80211_ioctl.h> 124 #include <net/if_types.h> 125 #include <net/radix.h> 126 #include <net/route.h> 127 #include <net/netisr.h> 128 #include <sys/module.h> 129 #ifdef NETATALK 130 #include <netatalk/at_extern.h> 131 #include <netatalk/at.h> 132 #endif 133 #include <net/pfil.h> 134 #include <netinet/in.h> 135 #include <netinet/in_var.h> 136 137 #ifdef INET6 138 #include <netinet6/in6_var.h> 139 #include <netinet6/nd6.h> 140 #endif 141 142 #include "ether.h" 143 #include "fddi.h" 144 #include "token.h" 145 146 #include "carp.h" 147 #if NCARP > 0 148 #include <netinet/ip_carp.h> 149 #endif 150 151 #include <compat/sys/sockio.h> 152 #include <compat/sys/socket.h> 153 154 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 155 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 156 157 /* 158 * Global list of interfaces. 159 */ 160 struct ifnet_head ifnet_list; 161 static ifnet_t ** ifindex2ifnet = NULL; 162 163 static u_int if_index = 1; 164 static size_t if_indexlim = 0; 165 static uint64_t index_gen; 166 static kmutex_t index_gen_mtx; 167 static kmutex_t if_clone_mtx; 168 169 static struct ifaddr ** ifnet_addrs = NULL; 170 171 static callout_t if_slowtimo_ch; 172 173 struct ifnet *lo0ifp; 174 int ifqmaxlen = IFQ_MAXLEN; 175 176 static int if_rt_walktree(struct rtentry *, void *); 177 178 static struct if_clone *if_clone_lookup(const char *, int *); 179 static int if_clone_list(struct if_clonereq *); 180 181 static LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 182 static int if_cloners_count; 183 184 /* Packet filtering hook for interfaces. */ 185 pfil_head_t * if_pfil; 186 187 static kauth_listener_t if_listener; 188 189 static int doifioctl(struct socket *, u_long, void *, struct lwp *); 190 static int ifioctl_attach(struct ifnet *); 191 static void ifioctl_detach(struct ifnet *); 192 static void ifnet_lock_enter(struct ifnet_lock *); 193 static void ifnet_lock_exit(struct ifnet_lock *); 194 static void if_detach_queues(struct ifnet *, struct ifqueue *); 195 static void sysctl_sndq_setup(struct sysctllog **, const char *, 196 struct ifaltq *); 197 198 #if defined(INET) || defined(INET6) 199 static void sysctl_net_pktq_setup(struct sysctllog **, int); 200 #endif 201 202 static int 203 if_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 204 void *arg0, void *arg1, void *arg2, void *arg3) 205 { 206 int result; 207 enum kauth_network_req req; 208 209 result = KAUTH_RESULT_DEFER; 210 req = (enum kauth_network_req)arg1; 211 212 if (action != KAUTH_NETWORK_INTERFACE) 213 return result; 214 215 if ((req == KAUTH_REQ_NETWORK_INTERFACE_GET) || 216 (req == KAUTH_REQ_NETWORK_INTERFACE_SET)) 217 result = KAUTH_RESULT_ALLOW; 218 219 return result; 220 } 221 222 /* 223 * Network interface utility routines. 224 * 225 * Routines with ifa_ifwith* names take sockaddr *'s as 226 * parameters. 227 */ 228 void 229 ifinit(void) 230 { 231 #if defined(INET) 232 sysctl_net_pktq_setup(NULL, PF_INET); 233 #endif 234 #ifdef INET6 235 sysctl_net_pktq_setup(NULL, PF_INET6); 236 #endif 237 238 callout_init(&if_slowtimo_ch, 0); 239 if_slowtimo(NULL); 240 241 if_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 242 if_listener_cb, NULL); 243 244 /* interfaces are available, inform socket code */ 245 ifioctl = doifioctl; 246 } 247 248 /* 249 * XXX Initialization before configure(). 250 * XXX hack to get pfil_add_hook working in autoconf. 251 */ 252 void 253 ifinit1(void) 254 { 255 mutex_init(&index_gen_mtx, MUTEX_DEFAULT, IPL_NONE); 256 mutex_init(&if_clone_mtx, MUTEX_DEFAULT, IPL_NONE); 257 TAILQ_INIT(&ifnet_list); 258 if_indexlim = 8; 259 260 if_pfil = pfil_head_create(PFIL_TYPE_IFNET, NULL); 261 KASSERT(if_pfil != NULL); 262 263 #if NETHER > 0 || NFDDI > 0 || defined(NETATALK) || NTOKEN > 0 || defined(WLAN) 264 etherinit(); 265 #endif 266 } 267 268 ifnet_t * 269 if_alloc(u_char type) 270 { 271 return kmem_zalloc(sizeof(ifnet_t), KM_SLEEP); 272 } 273 274 void 275 if_free(ifnet_t *ifp) 276 { 277 kmem_free(ifp, sizeof(ifnet_t)); 278 } 279 280 void 281 if_initname(struct ifnet *ifp, const char *name, int unit) 282 { 283 (void)snprintf(ifp->if_xname, sizeof(ifp->if_xname), 284 "%s%d", name, unit); 285 } 286 287 /* 288 * Null routines used while an interface is going away. These routines 289 * just return an error. 290 */ 291 292 int 293 if_nulloutput(struct ifnet *ifp, struct mbuf *m, 294 const struct sockaddr *so, struct rtentry *rt) 295 { 296 297 return ENXIO; 298 } 299 300 void 301 if_nullinput(struct ifnet *ifp, struct mbuf *m) 302 { 303 304 /* Nothing. */ 305 } 306 307 void 308 if_nullstart(struct ifnet *ifp) 309 { 310 311 /* Nothing. */ 312 } 313 314 int 315 if_nullioctl(struct ifnet *ifp, u_long cmd, void *data) 316 { 317 318 /* Wake ifioctl_detach(), who may wait for all threads to 319 * quit the critical section. 320 */ 321 cv_signal(&ifp->if_ioctl_lock->il_emptied); 322 return ENXIO; 323 } 324 325 int 326 if_nullinit(struct ifnet *ifp) 327 { 328 329 return ENXIO; 330 } 331 332 void 333 if_nullstop(struct ifnet *ifp, int disable) 334 { 335 336 /* Nothing. */ 337 } 338 339 void 340 if_nullwatchdog(struct ifnet *ifp) 341 { 342 343 /* Nothing. */ 344 } 345 346 void 347 if_nulldrain(struct ifnet *ifp) 348 { 349 350 /* Nothing. */ 351 } 352 353 void 354 if_set_sadl(struct ifnet *ifp, const void *lla, u_char addrlen, bool factory) 355 { 356 struct ifaddr *ifa; 357 struct sockaddr_dl *sdl; 358 359 ifp->if_addrlen = addrlen; 360 if_alloc_sadl(ifp); 361 ifa = ifp->if_dl; 362 sdl = satosdl(ifa->ifa_addr); 363 364 (void)sockaddr_dl_setaddr(sdl, sdl->sdl_len, lla, ifp->if_addrlen); 365 if (factory) { 366 ifp->if_hwdl = ifp->if_dl; 367 ifaref(ifp->if_hwdl); 368 } 369 /* TBD routing socket */ 370 } 371 372 struct ifaddr * 373 if_dl_create(const struct ifnet *ifp, const struct sockaddr_dl **sdlp) 374 { 375 unsigned socksize, ifasize; 376 int addrlen, namelen; 377 struct sockaddr_dl *mask, *sdl; 378 struct ifaddr *ifa; 379 380 namelen = strlen(ifp->if_xname); 381 addrlen = ifp->if_addrlen; 382 socksize = roundup(sockaddr_dl_measure(namelen, addrlen), sizeof(long)); 383 ifasize = sizeof(*ifa) + 2 * socksize; 384 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK|M_ZERO); 385 386 sdl = (struct sockaddr_dl *)(ifa + 1); 387 mask = (struct sockaddr_dl *)(socksize + (char *)sdl); 388 389 sockaddr_dl_init(sdl, socksize, ifp->if_index, ifp->if_type, 390 ifp->if_xname, namelen, NULL, addrlen); 391 mask->sdl_len = sockaddr_dl_measure(namelen, 0); 392 memset(&mask->sdl_data[0], 0xff, namelen); 393 ifa->ifa_rtrequest = link_rtrequest; 394 ifa->ifa_addr = (struct sockaddr *)sdl; 395 ifa->ifa_netmask = (struct sockaddr *)mask; 396 397 *sdlp = sdl; 398 399 return ifa; 400 } 401 402 static void 403 if_sadl_setrefs(struct ifnet *ifp, struct ifaddr *ifa) 404 { 405 const struct sockaddr_dl *sdl; 406 ifnet_addrs[ifp->if_index] = ifa; 407 ifaref(ifa); 408 ifp->if_dl = ifa; 409 ifaref(ifa); 410 sdl = satosdl(ifa->ifa_addr); 411 ifp->if_sadl = sdl; 412 } 413 414 /* 415 * Allocate the link level name for the specified interface. This 416 * is an attachment helper. It must be called after ifp->if_addrlen 417 * is initialized, which may not be the case when if_attach() is 418 * called. 419 */ 420 void 421 if_alloc_sadl(struct ifnet *ifp) 422 { 423 struct ifaddr *ifa; 424 const struct sockaddr_dl *sdl; 425 426 /* 427 * If the interface already has a link name, release it 428 * now. This is useful for interfaces that can change 429 * link types, and thus switch link names often. 430 */ 431 if (ifp->if_sadl != NULL) 432 if_free_sadl(ifp); 433 434 ifa = if_dl_create(ifp, &sdl); 435 436 ifa_insert(ifp, ifa); 437 if_sadl_setrefs(ifp, ifa); 438 } 439 440 static void 441 if_deactivate_sadl(struct ifnet *ifp) 442 { 443 struct ifaddr *ifa; 444 445 KASSERT(ifp->if_dl != NULL); 446 447 ifa = ifp->if_dl; 448 449 ifp->if_sadl = NULL; 450 451 ifnet_addrs[ifp->if_index] = NULL; 452 ifafree(ifa); 453 ifp->if_dl = NULL; 454 ifafree(ifa); 455 } 456 457 void 458 if_activate_sadl(struct ifnet *ifp, struct ifaddr *ifa, 459 const struct sockaddr_dl *sdl) 460 { 461 int s; 462 463 s = splnet(); 464 465 if_deactivate_sadl(ifp); 466 467 if_sadl_setrefs(ifp, ifa); 468 IFADDR_FOREACH(ifa, ifp) 469 rtinit(ifa, RTM_LLINFO_UPD, 0); 470 splx(s); 471 } 472 473 /* 474 * Free the link level name for the specified interface. This is 475 * a detach helper. This is called from if_detach() or from 476 * link layer type specific detach functions. 477 */ 478 void 479 if_free_sadl(struct ifnet *ifp) 480 { 481 struct ifaddr *ifa; 482 int s; 483 484 ifa = ifnet_addrs[ifp->if_index]; 485 if (ifa == NULL) { 486 KASSERT(ifp->if_sadl == NULL); 487 KASSERT(ifp->if_dl == NULL); 488 return; 489 } 490 491 KASSERT(ifp->if_sadl != NULL); 492 KASSERT(ifp->if_dl != NULL); 493 494 s = splnet(); 495 rtinit(ifa, RTM_DELETE, 0); 496 ifa_remove(ifp, ifa); 497 if_deactivate_sadl(ifp); 498 if (ifp->if_hwdl == ifa) { 499 ifafree(ifa); 500 ifp->if_hwdl = NULL; 501 } 502 splx(s); 503 } 504 505 static void 506 if_getindex(ifnet_t *ifp) 507 { 508 bool hitlimit = false; 509 510 mutex_enter(&index_gen_mtx); 511 ifp->if_index_gen = index_gen++; 512 mutex_exit(&index_gen_mtx); 513 514 ifp->if_index = if_index; 515 if (ifindex2ifnet == NULL) { 516 if_index++; 517 goto skip; 518 } 519 while (if_byindex(ifp->if_index)) { 520 /* 521 * If we hit USHRT_MAX, we skip back to 0 since 522 * there are a number of places where the value 523 * of if_index or if_index itself is compared 524 * to or stored in an unsigned short. By 525 * jumping back, we won't botch those assignments 526 * or comparisons. 527 */ 528 if (++if_index == 0) { 529 if_index = 1; 530 } else if (if_index == USHRT_MAX) { 531 /* 532 * However, if we have to jump back to 533 * zero *twice* without finding an empty 534 * slot in ifindex2ifnet[], then there 535 * there are too many (>65535) interfaces. 536 */ 537 if (hitlimit) { 538 panic("too many interfaces"); 539 } 540 hitlimit = true; 541 if_index = 1; 542 } 543 ifp->if_index = if_index; 544 } 545 skip: 546 /* 547 * We have some arrays that should be indexed by if_index. 548 * since if_index will grow dynamically, they should grow too. 549 * struct ifadd **ifnet_addrs 550 * struct ifnet **ifindex2ifnet 551 */ 552 if (ifnet_addrs == NULL || ifindex2ifnet == NULL || 553 ifp->if_index >= if_indexlim) { 554 size_t m, n, oldlim; 555 void *q; 556 557 oldlim = if_indexlim; 558 while (ifp->if_index >= if_indexlim) 559 if_indexlim <<= 1; 560 561 /* grow ifnet_addrs */ 562 m = oldlim * sizeof(struct ifaddr *); 563 n = if_indexlim * sizeof(struct ifaddr *); 564 q = malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 565 if (ifnet_addrs != NULL) { 566 memcpy(q, ifnet_addrs, m); 567 free(ifnet_addrs, M_IFADDR); 568 } 569 ifnet_addrs = (struct ifaddr **)q; 570 571 /* grow ifindex2ifnet */ 572 m = oldlim * sizeof(struct ifnet *); 573 n = if_indexlim * sizeof(struct ifnet *); 574 q = malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 575 if (ifindex2ifnet != NULL) { 576 memcpy(q, ifindex2ifnet, m); 577 free(ifindex2ifnet, M_IFADDR); 578 } 579 ifindex2ifnet = (struct ifnet **)q; 580 } 581 ifindex2ifnet[ifp->if_index] = ifp; 582 } 583 584 /* 585 * Attach an interface to the list of "active" interfaces. 586 */ 587 void 588 if_attach(ifnet_t *ifp) 589 { 590 KASSERT(if_indexlim > 0); 591 TAILQ_INIT(&ifp->if_addrlist); 592 TAILQ_INSERT_TAIL(&ifnet_list, ifp, if_list); 593 594 if (ifioctl_attach(ifp) != 0) 595 panic("%s: ifioctl_attach() failed", __func__); 596 597 if_getindex(ifp); 598 599 /* 600 * Link level name is allocated later by a separate call to 601 * if_alloc_sadl(). 602 */ 603 604 if (ifp->if_snd.ifq_maxlen == 0) 605 ifp->if_snd.ifq_maxlen = ifqmaxlen; 606 607 sysctl_sndq_setup(&ifp->if_sysctl_log, ifp->if_xname, &ifp->if_snd); 608 609 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 610 611 ifp->if_link_state = LINK_STATE_UNKNOWN; 612 613 ifp->if_capenable = 0; 614 ifp->if_csum_flags_tx = 0; 615 ifp->if_csum_flags_rx = 0; 616 617 #ifdef ALTQ 618 ifp->if_snd.altq_type = 0; 619 ifp->if_snd.altq_disc = NULL; 620 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 621 ifp->if_snd.altq_tbr = NULL; 622 ifp->if_snd.altq_ifp = ifp; 623 #endif 624 625 #ifdef NET_MPSAFE 626 ifp->if_snd.ifq_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 627 #else 628 ifp->if_snd.ifq_lock = NULL; 629 #endif 630 631 ifp->if_pfil = pfil_head_create(PFIL_TYPE_IFNET, ifp); 632 (void)pfil_run_hooks(if_pfil, 633 (struct mbuf **)PFIL_IFNET_ATTACH, ifp, PFIL_IFNET); 634 635 if (!STAILQ_EMPTY(&domains)) 636 if_attachdomain1(ifp); 637 638 /* Announce the interface. */ 639 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 640 } 641 642 void 643 if_attachdomain(void) 644 { 645 struct ifnet *ifp; 646 int s; 647 648 s = splnet(); 649 IFNET_FOREACH(ifp) 650 if_attachdomain1(ifp); 651 splx(s); 652 } 653 654 void 655 if_attachdomain1(struct ifnet *ifp) 656 { 657 struct domain *dp; 658 int s; 659 660 s = splnet(); 661 662 /* address family dependent data region */ 663 memset(ifp->if_afdata, 0, sizeof(ifp->if_afdata)); 664 DOMAIN_FOREACH(dp) { 665 if (dp->dom_ifattach != NULL) 666 ifp->if_afdata[dp->dom_family] = 667 (*dp->dom_ifattach)(ifp); 668 } 669 670 splx(s); 671 } 672 673 /* 674 * Deactivate an interface. This points all of the procedure 675 * handles at error stubs. May be called from interrupt context. 676 */ 677 void 678 if_deactivate(struct ifnet *ifp) 679 { 680 int s; 681 682 s = splnet(); 683 684 ifp->if_output = if_nulloutput; 685 ifp->if_input = if_nullinput; 686 ifp->if_start = if_nullstart; 687 ifp->if_ioctl = if_nullioctl; 688 ifp->if_init = if_nullinit; 689 ifp->if_stop = if_nullstop; 690 ifp->if_watchdog = if_nullwatchdog; 691 ifp->if_drain = if_nulldrain; 692 693 /* No more packets may be enqueued. */ 694 ifp->if_snd.ifq_maxlen = 0; 695 696 splx(s); 697 } 698 699 void 700 if_purgeaddrs(struct ifnet *ifp, int family, void (*purgeaddr)(struct ifaddr *)) 701 { 702 struct ifaddr *ifa, *nifa; 703 704 IFADDR_FOREACH_SAFE(ifa, ifp, nifa) { 705 if (ifa->ifa_addr->sa_family != family) 706 continue; 707 (*purgeaddr)(ifa); 708 } 709 } 710 711 /* 712 * Detach an interface from the list of "active" interfaces, 713 * freeing any resources as we go along. 714 * 715 * NOTE: This routine must be called with a valid thread context, 716 * as it may block. 717 */ 718 void 719 if_detach(struct ifnet *ifp) 720 { 721 struct socket so; 722 struct ifaddr *ifa; 723 #ifdef IFAREF_DEBUG 724 struct ifaddr *last_ifa = NULL; 725 #endif 726 struct domain *dp; 727 const struct protosw *pr; 728 int s, i, family, purged; 729 uint64_t xc; 730 731 /* 732 * XXX It's kind of lame that we have to have the 733 * XXX socket structure... 734 */ 735 memset(&so, 0, sizeof(so)); 736 737 s = splnet(); 738 739 /* 740 * Do an if_down() to give protocols a chance to do something. 741 */ 742 if_down(ifp); 743 744 #ifdef ALTQ 745 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 746 altq_disable(&ifp->if_snd); 747 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 748 altq_detach(&ifp->if_snd); 749 #endif 750 751 if (ifp->if_snd.ifq_lock) 752 mutex_obj_free(ifp->if_snd.ifq_lock); 753 754 sysctl_teardown(&ifp->if_sysctl_log); 755 756 #if NCARP > 0 757 /* Remove the interface from any carp group it is a part of. */ 758 if (ifp->if_carp != NULL && ifp->if_type != IFT_CARP) 759 carp_ifdetach(ifp); 760 #endif 761 762 /* 763 * Rip all the addresses off the interface. This should make 764 * all of the routes go away. 765 * 766 * pr_usrreq calls can remove an arbitrary number of ifaddrs 767 * from the list, including our "cursor", ifa. For safety, 768 * and to honor the TAILQ abstraction, I just restart the 769 * loop after each removal. Note that the loop will exit 770 * when all of the remaining ifaddrs belong to the AF_LINK 771 * family. I am counting on the historical fact that at 772 * least one pr_usrreq in each address domain removes at 773 * least one ifaddr. 774 */ 775 again: 776 IFADDR_FOREACH(ifa, ifp) { 777 family = ifa->ifa_addr->sa_family; 778 #ifdef IFAREF_DEBUG 779 printf("if_detach: ifaddr %p, family %d, refcnt %d\n", 780 ifa, family, ifa->ifa_refcnt); 781 if (last_ifa != NULL && ifa == last_ifa) 782 panic("if_detach: loop detected"); 783 last_ifa = ifa; 784 #endif 785 if (family == AF_LINK) 786 continue; 787 dp = pffinddomain(family); 788 #ifdef DIAGNOSTIC 789 if (dp == NULL) 790 panic("if_detach: no domain for AF %d", 791 family); 792 #endif 793 /* 794 * XXX These PURGEIF calls are redundant with the 795 * purge-all-families calls below, but are left in for 796 * now both to make a smaller change, and to avoid 797 * unplanned interactions with clearing of 798 * ifp->if_addrlist. 799 */ 800 purged = 0; 801 for (pr = dp->dom_protosw; 802 pr < dp->dom_protoswNPROTOSW; pr++) { 803 so.so_proto = pr; 804 if (pr->pr_usrreqs) { 805 (void) (*pr->pr_usrreqs->pr_purgeif)(&so, ifp); 806 purged = 1; 807 } 808 } 809 if (purged == 0) { 810 /* 811 * XXX What's really the best thing to do 812 * XXX here? --thorpej (at) NetBSD.org 813 */ 814 printf("if_detach: WARNING: AF %d not purged\n", 815 family); 816 ifa_remove(ifp, ifa); 817 } 818 goto again; 819 } 820 821 if_free_sadl(ifp); 822 823 /* Walk the routing table looking for stragglers. */ 824 for (i = 0; i <= AF_MAX; i++) { 825 while (rt_walktree(i, if_rt_walktree, ifp) == ERESTART) 826 continue; 827 } 828 829 DOMAIN_FOREACH(dp) { 830 if (dp->dom_ifdetach != NULL && ifp->if_afdata[dp->dom_family]) 831 { 832 void *p = ifp->if_afdata[dp->dom_family]; 833 if (p) { 834 ifp->if_afdata[dp->dom_family] = NULL; 835 (*dp->dom_ifdetach)(ifp, p); 836 } 837 } 838 839 /* 840 * One would expect multicast memberships (INET and 841 * INET6) on UDP sockets to be purged by the PURGEIF 842 * calls above, but if all addresses were removed from 843 * the interface prior to destruction, the calls will 844 * not be made (e.g. ppp, for which pppd(8) generally 845 * removes addresses before destroying the interface). 846 * Because there is no invariant that multicast 847 * memberships only exist for interfaces with IPv4 848 * addresses, we must call PURGEIF regardless of 849 * addresses. (Protocols which might store ifnet 850 * pointers are marked with PR_PURGEIF.) 851 */ 852 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 853 so.so_proto = pr; 854 if (pr->pr_usrreqs && pr->pr_flags & PR_PURGEIF) 855 (void)(*pr->pr_usrreqs->pr_purgeif)(&so, ifp); 856 } 857 } 858 859 (void)pfil_run_hooks(if_pfil, 860 (struct mbuf **)PFIL_IFNET_DETACH, ifp, PFIL_IFNET); 861 (void)pfil_head_destroy(ifp->if_pfil); 862 863 /* Announce that the interface is gone. */ 864 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 865 866 ifindex2ifnet[ifp->if_index] = NULL; 867 868 TAILQ_REMOVE(&ifnet_list, ifp, if_list); 869 870 ifioctl_detach(ifp); 871 872 /* 873 * remove packets that came from ifp, from software interrupt queues. 874 */ 875 DOMAIN_FOREACH(dp) { 876 for (i = 0; i < __arraycount(dp->dom_ifqueues); i++) { 877 struct ifqueue *iq = dp->dom_ifqueues[i]; 878 if (iq == NULL) 879 break; 880 dp->dom_ifqueues[i] = NULL; 881 if_detach_queues(ifp, iq); 882 } 883 } 884 885 /* 886 * IP queues have to be processed separately: net-queue barrier 887 * ensures that the packets are dequeued while a cross-call will 888 * ensure that the interrupts have completed. FIXME: not quite.. 889 */ 890 #ifdef INET 891 pktq_barrier(ip_pktq); 892 #endif 893 #ifdef INET6 894 pktq_barrier(ip6_pktq); 895 #endif 896 xc = xc_broadcast(0, (xcfunc_t)nullop, NULL, NULL); 897 xc_wait(xc); 898 899 splx(s); 900 } 901 902 static void 903 if_detach_queues(struct ifnet *ifp, struct ifqueue *q) 904 { 905 struct mbuf *m, *prev, *next; 906 907 prev = NULL; 908 for (m = q->ifq_head; m != NULL; m = next) { 909 KASSERT((m->m_flags & M_PKTHDR) != 0); 910 911 next = m->m_nextpkt; 912 if (m->m_pkthdr.rcvif != ifp) { 913 prev = m; 914 continue; 915 } 916 917 if (prev != NULL) 918 prev->m_nextpkt = m->m_nextpkt; 919 else 920 q->ifq_head = m->m_nextpkt; 921 if (q->ifq_tail == m) 922 q->ifq_tail = prev; 923 q->ifq_len--; 924 925 m->m_nextpkt = NULL; 926 m_freem(m); 927 IF_DROP(q); 928 } 929 } 930 931 /* 932 * Callback for a radix tree walk to delete all references to an 933 * ifnet. 934 */ 935 static int 936 if_rt_walktree(struct rtentry *rt, void *v) 937 { 938 struct ifnet *ifp = (struct ifnet *)v; 939 int error; 940 941 if (rt->rt_ifp != ifp) 942 return 0; 943 944 /* Delete the entry. */ 945 ++rt->rt_refcnt; 946 error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway, 947 rt_mask(rt), rt->rt_flags, NULL); 948 KASSERT((rt->rt_flags & RTF_UP) == 0); 949 rt->rt_ifp = NULL; 950 rtfree(rt); 951 if (error != 0) 952 printf("%s: warning: unable to delete rtentry @ %p, " 953 "error = %d\n", ifp->if_xname, rt, error); 954 return ERESTART; 955 } 956 957 /* 958 * Create a clone network interface. 959 */ 960 int 961 if_clone_create(const char *name) 962 { 963 struct if_clone *ifc; 964 int unit; 965 966 ifc = if_clone_lookup(name, &unit); 967 if (ifc == NULL) 968 return EINVAL; 969 970 if (ifunit(name) != NULL) 971 return EEXIST; 972 973 return (*ifc->ifc_create)(ifc, unit); 974 } 975 976 /* 977 * Destroy a clone network interface. 978 */ 979 int 980 if_clone_destroy(const char *name) 981 { 982 struct if_clone *ifc; 983 struct ifnet *ifp; 984 985 ifc = if_clone_lookup(name, NULL); 986 if (ifc == NULL) 987 return EINVAL; 988 989 ifp = ifunit(name); 990 if (ifp == NULL) 991 return ENXIO; 992 993 if (ifc->ifc_destroy == NULL) 994 return EOPNOTSUPP; 995 996 return (*ifc->ifc_destroy)(ifp); 997 } 998 999 /* 1000 * Look up a network interface cloner. 1001 */ 1002 static struct if_clone * 1003 if_clone_lookup(const char *name, int *unitp) 1004 { 1005 struct if_clone *ifc; 1006 const char *cp; 1007 char *dp, ifname[IFNAMSIZ + 3]; 1008 int unit; 1009 1010 strcpy(ifname, "if_"); 1011 /* separate interface name from unit */ 1012 for (dp = ifname + 3, cp = name; cp - name < IFNAMSIZ && 1013 *cp && (*cp < '0' || *cp > '9');) 1014 *dp++ = *cp++; 1015 1016 if (cp == name || cp - name == IFNAMSIZ || !*cp) 1017 return NULL; /* No name or unit number */ 1018 *dp++ = '\0'; 1019 1020 again: 1021 LIST_FOREACH(ifc, &if_cloners, ifc_list) { 1022 if (strcmp(ifname + 3, ifc->ifc_name) == 0) 1023 break; 1024 } 1025 1026 if (ifc == NULL) { 1027 if (*ifname == '\0' || 1028 module_autoload(ifname, MODULE_CLASS_DRIVER)) 1029 return NULL; 1030 *ifname = '\0'; 1031 goto again; 1032 } 1033 1034 unit = 0; 1035 while (cp - name < IFNAMSIZ && *cp) { 1036 if (*cp < '0' || *cp > '9' || unit >= INT_MAX / 10) { 1037 /* Bogus unit number. */ 1038 return NULL; 1039 } 1040 unit = (unit * 10) + (*cp++ - '0'); 1041 } 1042 1043 if (unitp != NULL) 1044 *unitp = unit; 1045 return ifc; 1046 } 1047 1048 /* 1049 * Register a network interface cloner. 1050 */ 1051 void 1052 if_clone_attach(struct if_clone *ifc) 1053 { 1054 1055 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 1056 if_cloners_count++; 1057 } 1058 1059 /* 1060 * Unregister a network interface cloner. 1061 */ 1062 void 1063 if_clone_detach(struct if_clone *ifc) 1064 { 1065 1066 LIST_REMOVE(ifc, ifc_list); 1067 if_cloners_count--; 1068 } 1069 1070 /* 1071 * Provide list of interface cloners to userspace. 1072 */ 1073 static int 1074 if_clone_list(struct if_clonereq *ifcr) 1075 { 1076 char outbuf[IFNAMSIZ], *dst; 1077 struct if_clone *ifc; 1078 int count, error = 0; 1079 1080 ifcr->ifcr_total = if_cloners_count; 1081 if ((dst = ifcr->ifcr_buffer) == NULL) { 1082 /* Just asking how many there are. */ 1083 return 0; 1084 } 1085 1086 if (ifcr->ifcr_count < 0) 1087 return EINVAL; 1088 1089 count = (if_cloners_count < ifcr->ifcr_count) ? 1090 if_cloners_count : ifcr->ifcr_count; 1091 1092 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 1093 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 1094 (void)strncpy(outbuf, ifc->ifc_name, sizeof(outbuf)); 1095 if (outbuf[sizeof(outbuf) - 1] != '\0') 1096 return ENAMETOOLONG; 1097 error = copyout(outbuf, dst, sizeof(outbuf)); 1098 if (error != 0) 1099 break; 1100 } 1101 1102 return error; 1103 } 1104 1105 void 1106 ifaref(struct ifaddr *ifa) 1107 { 1108 ifa->ifa_refcnt++; 1109 } 1110 1111 void 1112 ifafree(struct ifaddr *ifa) 1113 { 1114 KASSERT(ifa != NULL); 1115 KASSERT(ifa->ifa_refcnt > 0); 1116 1117 if (--ifa->ifa_refcnt == 0) { 1118 free(ifa, M_IFADDR); 1119 } 1120 } 1121 1122 void 1123 ifa_insert(struct ifnet *ifp, struct ifaddr *ifa) 1124 { 1125 ifa->ifa_ifp = ifp; 1126 TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list); 1127 ifaref(ifa); 1128 } 1129 1130 void 1131 ifa_remove(struct ifnet *ifp, struct ifaddr *ifa) 1132 { 1133 KASSERT(ifa->ifa_ifp == ifp); 1134 TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list); 1135 ifafree(ifa); 1136 } 1137 1138 static inline int 1139 equal(const struct sockaddr *sa1, const struct sockaddr *sa2) 1140 { 1141 return sockaddr_cmp(sa1, sa2) == 0; 1142 } 1143 1144 /* 1145 * Locate an interface based on a complete address. 1146 */ 1147 /*ARGSUSED*/ 1148 struct ifaddr * 1149 ifa_ifwithaddr(const struct sockaddr *addr) 1150 { 1151 struct ifnet *ifp; 1152 struct ifaddr *ifa; 1153 1154 IFNET_FOREACH(ifp) { 1155 if (ifp->if_output == if_nulloutput) 1156 continue; 1157 IFADDR_FOREACH(ifa, ifp) { 1158 if (ifa->ifa_addr->sa_family != addr->sa_family) 1159 continue; 1160 if (equal(addr, ifa->ifa_addr)) 1161 return ifa; 1162 if ((ifp->if_flags & IFF_BROADCAST) && 1163 ifa->ifa_broadaddr && 1164 /* IP6 doesn't have broadcast */ 1165 ifa->ifa_broadaddr->sa_len != 0 && 1166 equal(ifa->ifa_broadaddr, addr)) 1167 return ifa; 1168 } 1169 } 1170 return NULL; 1171 } 1172 1173 /* 1174 * Locate the point to point interface with a given destination address. 1175 */ 1176 /*ARGSUSED*/ 1177 struct ifaddr * 1178 ifa_ifwithdstaddr(const struct sockaddr *addr) 1179 { 1180 struct ifnet *ifp; 1181 struct ifaddr *ifa; 1182 1183 IFNET_FOREACH(ifp) { 1184 if (ifp->if_output == if_nulloutput) 1185 continue; 1186 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1187 continue; 1188 IFADDR_FOREACH(ifa, ifp) { 1189 if (ifa->ifa_addr->sa_family != addr->sa_family || 1190 ifa->ifa_dstaddr == NULL) 1191 continue; 1192 if (equal(addr, ifa->ifa_dstaddr)) 1193 return ifa; 1194 } 1195 } 1196 return NULL; 1197 } 1198 1199 /* 1200 * Find an interface on a specific network. If many, choice 1201 * is most specific found. 1202 */ 1203 struct ifaddr * 1204 ifa_ifwithnet(const struct sockaddr *addr) 1205 { 1206 struct ifnet *ifp; 1207 struct ifaddr *ifa; 1208 const struct sockaddr_dl *sdl; 1209 struct ifaddr *ifa_maybe = 0; 1210 u_int af = addr->sa_family; 1211 const char *addr_data = addr->sa_data, *cplim; 1212 1213 if (af == AF_LINK) { 1214 sdl = satocsdl(addr); 1215 if (sdl->sdl_index && sdl->sdl_index < if_indexlim && 1216 ifindex2ifnet[sdl->sdl_index] && 1217 ifindex2ifnet[sdl->sdl_index]->if_output != if_nulloutput) 1218 return ifnet_addrs[sdl->sdl_index]; 1219 } 1220 #ifdef NETATALK 1221 if (af == AF_APPLETALK) { 1222 const struct sockaddr_at *sat, *sat2; 1223 sat = (const struct sockaddr_at *)addr; 1224 IFNET_FOREACH(ifp) { 1225 if (ifp->if_output == if_nulloutput) 1226 continue; 1227 ifa = at_ifawithnet((const struct sockaddr_at *)addr, ifp); 1228 if (ifa == NULL) 1229 continue; 1230 sat2 = (struct sockaddr_at *)ifa->ifa_addr; 1231 if (sat2->sat_addr.s_net == sat->sat_addr.s_net) 1232 return ifa; /* exact match */ 1233 if (ifa_maybe == NULL) { 1234 /* else keep the if with the right range */ 1235 ifa_maybe = ifa; 1236 } 1237 } 1238 return ifa_maybe; 1239 } 1240 #endif 1241 IFNET_FOREACH(ifp) { 1242 if (ifp->if_output == if_nulloutput) 1243 continue; 1244 IFADDR_FOREACH(ifa, ifp) { 1245 const char *cp, *cp2, *cp3; 1246 1247 if (ifa->ifa_addr->sa_family != af || 1248 ifa->ifa_netmask == NULL) 1249 next: continue; 1250 cp = addr_data; 1251 cp2 = ifa->ifa_addr->sa_data; 1252 cp3 = ifa->ifa_netmask->sa_data; 1253 cplim = (const char *)ifa->ifa_netmask + 1254 ifa->ifa_netmask->sa_len; 1255 while (cp3 < cplim) { 1256 if ((*cp++ ^ *cp2++) & *cp3++) { 1257 /* want to continue for() loop */ 1258 goto next; 1259 } 1260 } 1261 if (ifa_maybe == NULL || 1262 rn_refines((void *)ifa->ifa_netmask, 1263 (void *)ifa_maybe->ifa_netmask)) 1264 ifa_maybe = ifa; 1265 } 1266 } 1267 return ifa_maybe; 1268 } 1269 1270 /* 1271 * Find the interface of the addresss. 1272 */ 1273 struct ifaddr * 1274 ifa_ifwithladdr(const struct sockaddr *addr) 1275 { 1276 struct ifaddr *ia; 1277 1278 if ((ia = ifa_ifwithaddr(addr)) || (ia = ifa_ifwithdstaddr(addr)) || 1279 (ia = ifa_ifwithnet(addr))) 1280 return ia; 1281 return NULL; 1282 } 1283 1284 /* 1285 * Find an interface using a specific address family 1286 */ 1287 struct ifaddr * 1288 ifa_ifwithaf(int af) 1289 { 1290 struct ifnet *ifp; 1291 struct ifaddr *ifa; 1292 1293 IFNET_FOREACH(ifp) { 1294 if (ifp->if_output == if_nulloutput) 1295 continue; 1296 IFADDR_FOREACH(ifa, ifp) { 1297 if (ifa->ifa_addr->sa_family == af) 1298 return ifa; 1299 } 1300 } 1301 return NULL; 1302 } 1303 1304 /* 1305 * Find an interface address specific to an interface best matching 1306 * a given address. 1307 */ 1308 struct ifaddr * 1309 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 1310 { 1311 struct ifaddr *ifa; 1312 const char *cp, *cp2, *cp3; 1313 const char *cplim; 1314 struct ifaddr *ifa_maybe = 0; 1315 u_int af = addr->sa_family; 1316 1317 if (ifp->if_output == if_nulloutput) 1318 return NULL; 1319 1320 if (af >= AF_MAX) 1321 return NULL; 1322 1323 IFADDR_FOREACH(ifa, ifp) { 1324 if (ifa->ifa_addr->sa_family != af) 1325 continue; 1326 ifa_maybe = ifa; 1327 if (ifa->ifa_netmask == NULL) { 1328 if (equal(addr, ifa->ifa_addr) || 1329 (ifa->ifa_dstaddr && 1330 equal(addr, ifa->ifa_dstaddr))) 1331 return ifa; 1332 continue; 1333 } 1334 cp = addr->sa_data; 1335 cp2 = ifa->ifa_addr->sa_data; 1336 cp3 = ifa->ifa_netmask->sa_data; 1337 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1338 for (; cp3 < cplim; cp3++) { 1339 if ((*cp++ ^ *cp2++) & *cp3) 1340 break; 1341 } 1342 if (cp3 == cplim) 1343 return ifa; 1344 } 1345 return ifa_maybe; 1346 } 1347 1348 /* 1349 * Default action when installing a route with a Link Level gateway. 1350 * Lookup an appropriate real ifa to point to. 1351 * This should be moved to /sys/net/link.c eventually. 1352 */ 1353 void 1354 link_rtrequest(int cmd, struct rtentry *rt, const struct rt_addrinfo *info) 1355 { 1356 struct ifaddr *ifa; 1357 const struct sockaddr *dst; 1358 struct ifnet *ifp; 1359 1360 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL || 1361 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_getkey(rt)) == NULL) 1362 return; 1363 if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) { 1364 rt_replace_ifa(rt, ifa); 1365 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1366 ifa->ifa_rtrequest(cmd, rt, info); 1367 } 1368 } 1369 1370 /* 1371 * Handle a change in the interface link state. 1372 * XXX: We should listen to the routing socket in-kernel rather 1373 * than calling in6_if_link_* functions directly from here. 1374 */ 1375 void 1376 if_link_state_change(struct ifnet *ifp, int link_state) 1377 { 1378 int s; 1379 #if defined(DEBUG) || defined(INET6) 1380 int old_link_state; 1381 #endif 1382 1383 s = splnet(); 1384 if (ifp->if_link_state == link_state) { 1385 splx(s); 1386 return; 1387 } 1388 1389 #if defined(DEBUG) || defined(INET6) 1390 old_link_state = ifp->if_link_state; 1391 #endif 1392 ifp->if_link_state = link_state; 1393 #ifdef DEBUG 1394 log(LOG_DEBUG, "%s: link state %s (was %s)\n", ifp->if_xname, 1395 link_state == LINK_STATE_UP ? "UP" : 1396 link_state == LINK_STATE_DOWN ? "DOWN" : 1397 "UNKNOWN", 1398 old_link_state == LINK_STATE_UP ? "UP" : 1399 old_link_state == LINK_STATE_DOWN ? "DOWN" : 1400 "UNKNOWN"); 1401 #endif 1402 1403 #ifdef INET6 1404 /* 1405 * When going from UNKNOWN to UP, we need to mark existing 1406 * IPv6 addresses as tentative and restart DAD as we may have 1407 * erroneously not found a duplicate. 1408 * 1409 * This needs to happen before rt_ifmsg to avoid a race where 1410 * listeners would have an address and expect it to work right 1411 * away. 1412 */ 1413 if (in6_present && link_state == LINK_STATE_UP && 1414 old_link_state == LINK_STATE_UNKNOWN) 1415 in6_if_link_down(ifp); 1416 #endif 1417 1418 /* Notify that the link state has changed. */ 1419 rt_ifmsg(ifp); 1420 1421 #if NCARP > 0 1422 if (ifp->if_carp) 1423 carp_carpdev_state(ifp); 1424 #endif 1425 1426 #ifdef INET6 1427 if (in6_present) { 1428 if (link_state == LINK_STATE_DOWN) 1429 in6_if_link_down(ifp); 1430 else if (link_state == LINK_STATE_UP) 1431 in6_if_link_up(ifp); 1432 } 1433 #endif 1434 1435 splx(s); 1436 } 1437 1438 /* 1439 * Mark an interface down and notify protocols of 1440 * the transition. 1441 * NOTE: must be called at splsoftnet or equivalent. 1442 */ 1443 void 1444 if_down(struct ifnet *ifp) 1445 { 1446 struct ifaddr *ifa; 1447 1448 ifp->if_flags &= ~IFF_UP; 1449 nanotime(&ifp->if_lastchange); 1450 IFADDR_FOREACH(ifa, ifp) 1451 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1452 IFQ_PURGE(&ifp->if_snd); 1453 #if NCARP > 0 1454 if (ifp->if_carp) 1455 carp_carpdev_state(ifp); 1456 #endif 1457 rt_ifmsg(ifp); 1458 #ifdef INET6 1459 if (in6_present) 1460 in6_if_down(ifp); 1461 #endif 1462 } 1463 1464 /* 1465 * Mark an interface up and notify protocols of 1466 * the transition. 1467 * NOTE: must be called at splsoftnet or equivalent. 1468 */ 1469 void 1470 if_up(struct ifnet *ifp) 1471 { 1472 #ifdef notyet 1473 struct ifaddr *ifa; 1474 #endif 1475 1476 ifp->if_flags |= IFF_UP; 1477 nanotime(&ifp->if_lastchange); 1478 #ifdef notyet 1479 /* this has no effect on IP, and will kill all ISO connections XXX */ 1480 IFADDR_FOREACH(ifa, ifp) 1481 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1482 #endif 1483 #if NCARP > 0 1484 if (ifp->if_carp) 1485 carp_carpdev_state(ifp); 1486 #endif 1487 rt_ifmsg(ifp); 1488 #ifdef INET6 1489 if (in6_present) 1490 in6_if_up(ifp); 1491 #endif 1492 } 1493 1494 /* 1495 * Handle interface watchdog timer routines. Called 1496 * from softclock, we decrement timers (if set) and 1497 * call the appropriate interface routine on expiration. 1498 */ 1499 void 1500 if_slowtimo(void *arg) 1501 { 1502 struct ifnet *ifp; 1503 int s = splnet(); 1504 1505 IFNET_FOREACH(ifp) { 1506 if (ifp->if_timer == 0 || --ifp->if_timer) 1507 continue; 1508 if (ifp->if_watchdog != NULL) 1509 (*ifp->if_watchdog)(ifp); 1510 } 1511 splx(s); 1512 callout_reset(&if_slowtimo_ch, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 1513 } 1514 1515 /* 1516 * Set/clear promiscuous mode on interface ifp based on the truth value 1517 * of pswitch. The calls are reference counted so that only the first 1518 * "on" request actually has an effect, as does the final "off" request. 1519 * Results are undefined if the "off" and "on" requests are not matched. 1520 */ 1521 int 1522 ifpromisc(struct ifnet *ifp, int pswitch) 1523 { 1524 int pcount, ret; 1525 short nflags; 1526 1527 pcount = ifp->if_pcount; 1528 if (pswitch) { 1529 /* 1530 * Allow the device to be "placed" into promiscuous 1531 * mode even if it is not configured up. It will 1532 * consult IFF_PROMISC when it is brought up. 1533 */ 1534 if (ifp->if_pcount++ != 0) 1535 return 0; 1536 nflags = ifp->if_flags | IFF_PROMISC; 1537 } else { 1538 if (--ifp->if_pcount > 0) 1539 return 0; 1540 nflags = ifp->if_flags & ~IFF_PROMISC; 1541 } 1542 ret = if_flags_set(ifp, nflags); 1543 /* Restore interface state if not successful. */ 1544 if (ret != 0) { 1545 ifp->if_pcount = pcount; 1546 } 1547 return ret; 1548 } 1549 1550 /* 1551 * Map interface name to 1552 * interface structure pointer. 1553 */ 1554 struct ifnet * 1555 ifunit(const char *name) 1556 { 1557 struct ifnet *ifp; 1558 const char *cp = name; 1559 u_int unit = 0; 1560 u_int i; 1561 1562 /* 1563 * If the entire name is a number, treat it as an ifindex. 1564 */ 1565 for (i = 0; i < IFNAMSIZ && *cp >= '0' && *cp <= '9'; i++, cp++) { 1566 unit = unit * 10 + (*cp - '0'); 1567 } 1568 1569 /* 1570 * If the number took all of the name, then it's a valid ifindex. 1571 */ 1572 if (i == IFNAMSIZ || (cp != name && *cp == '\0')) { 1573 if (unit >= if_indexlim) 1574 return NULL; 1575 ifp = ifindex2ifnet[unit]; 1576 if (ifp == NULL || ifp->if_output == if_nulloutput) 1577 return NULL; 1578 return ifp; 1579 } 1580 1581 IFNET_FOREACH(ifp) { 1582 if (ifp->if_output == if_nulloutput) 1583 continue; 1584 if (strcmp(ifp->if_xname, name) == 0) 1585 return ifp; 1586 } 1587 return NULL; 1588 } 1589 1590 ifnet_t * 1591 if_byindex(u_int idx) 1592 { 1593 return (idx < if_indexlim) ? ifindex2ifnet[idx] : NULL; 1594 } 1595 1596 /* common */ 1597 int 1598 ifioctl_common(struct ifnet *ifp, u_long cmd, void *data) 1599 { 1600 int s; 1601 struct ifreq *ifr; 1602 struct ifcapreq *ifcr; 1603 struct ifdatareq *ifdr; 1604 1605 switch (cmd) { 1606 case SIOCSIFCAP: 1607 ifcr = data; 1608 if ((ifcr->ifcr_capenable & ~ifp->if_capabilities) != 0) 1609 return EINVAL; 1610 1611 if (ifcr->ifcr_capenable == ifp->if_capenable) 1612 return 0; 1613 1614 ifp->if_capenable = ifcr->ifcr_capenable; 1615 1616 /* Pre-compute the checksum flags mask. */ 1617 ifp->if_csum_flags_tx = 0; 1618 ifp->if_csum_flags_rx = 0; 1619 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Tx) { 1620 ifp->if_csum_flags_tx |= M_CSUM_IPv4; 1621 } 1622 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Rx) { 1623 ifp->if_csum_flags_rx |= M_CSUM_IPv4; 1624 } 1625 1626 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Tx) { 1627 ifp->if_csum_flags_tx |= M_CSUM_TCPv4; 1628 } 1629 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Rx) { 1630 ifp->if_csum_flags_rx |= M_CSUM_TCPv4; 1631 } 1632 1633 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Tx) { 1634 ifp->if_csum_flags_tx |= M_CSUM_UDPv4; 1635 } 1636 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Rx) { 1637 ifp->if_csum_flags_rx |= M_CSUM_UDPv4; 1638 } 1639 1640 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Tx) { 1641 ifp->if_csum_flags_tx |= M_CSUM_TCPv6; 1642 } 1643 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Rx) { 1644 ifp->if_csum_flags_rx |= M_CSUM_TCPv6; 1645 } 1646 1647 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Tx) { 1648 ifp->if_csum_flags_tx |= M_CSUM_UDPv6; 1649 } 1650 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Rx) { 1651 ifp->if_csum_flags_rx |= M_CSUM_UDPv6; 1652 } 1653 if (ifp->if_flags & IFF_UP) 1654 return ENETRESET; 1655 return 0; 1656 case SIOCSIFFLAGS: 1657 ifr = data; 1658 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 1659 s = splnet(); 1660 if_down(ifp); 1661 splx(s); 1662 } 1663 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { 1664 s = splnet(); 1665 if_up(ifp); 1666 splx(s); 1667 } 1668 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1669 (ifr->ifr_flags &~ IFF_CANTCHANGE); 1670 break; 1671 case SIOCGIFFLAGS: 1672 ifr = data; 1673 ifr->ifr_flags = ifp->if_flags; 1674 break; 1675 1676 case SIOCGIFMETRIC: 1677 ifr = data; 1678 ifr->ifr_metric = ifp->if_metric; 1679 break; 1680 1681 case SIOCGIFMTU: 1682 ifr = data; 1683 ifr->ifr_mtu = ifp->if_mtu; 1684 break; 1685 1686 case SIOCGIFDLT: 1687 ifr = data; 1688 ifr->ifr_dlt = ifp->if_dlt; 1689 break; 1690 1691 case SIOCGIFCAP: 1692 ifcr = data; 1693 ifcr->ifcr_capabilities = ifp->if_capabilities; 1694 ifcr->ifcr_capenable = ifp->if_capenable; 1695 break; 1696 1697 case SIOCSIFMETRIC: 1698 ifr = data; 1699 ifp->if_metric = ifr->ifr_metric; 1700 break; 1701 1702 case SIOCGIFDATA: 1703 ifdr = data; 1704 ifdr->ifdr_data = ifp->if_data; 1705 break; 1706 1707 case SIOCGIFINDEX: 1708 ifr = data; 1709 ifr->ifr_index = ifp->if_index; 1710 break; 1711 1712 case SIOCZIFDATA: 1713 ifdr = data; 1714 ifdr->ifdr_data = ifp->if_data; 1715 /* 1716 * Assumes that the volatile counters that can be 1717 * zero'ed are at the end of if_data. 1718 */ 1719 memset(&ifp->if_data.ifi_ipackets, 0, sizeof(ifp->if_data) - 1720 offsetof(struct if_data, ifi_ipackets)); 1721 /* 1722 * The memset() clears to the bottm of if_data. In the area, 1723 * if_lastchange is included. Please be careful if new entry 1724 * will be added into if_data or rewite this. 1725 * 1726 * And also, update if_lastchnage. 1727 */ 1728 getnanotime(&ifp->if_lastchange); 1729 break; 1730 case SIOCSIFMTU: 1731 ifr = data; 1732 if (ifp->if_mtu == ifr->ifr_mtu) 1733 break; 1734 ifp->if_mtu = ifr->ifr_mtu; 1735 /* 1736 * If the link MTU changed, do network layer specific procedure. 1737 */ 1738 #ifdef INET6 1739 if (in6_present) 1740 nd6_setmtu(ifp); 1741 #endif 1742 return ENETRESET; 1743 default: 1744 return ENOTTY; 1745 } 1746 return 0; 1747 } 1748 1749 int 1750 ifaddrpref_ioctl(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 1751 { 1752 struct if_addrprefreq *ifap = (struct if_addrprefreq *)data; 1753 struct ifaddr *ifa; 1754 const struct sockaddr *any, *sa; 1755 union { 1756 struct sockaddr sa; 1757 struct sockaddr_storage ss; 1758 } u, v; 1759 1760 switch (cmd) { 1761 case SIOCSIFADDRPREF: 1762 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_INTERFACE, 1763 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1764 NULL) != 0) 1765 return EPERM; 1766 case SIOCGIFADDRPREF: 1767 break; 1768 default: 1769 return EOPNOTSUPP; 1770 } 1771 1772 /* sanity checks */ 1773 if (data == NULL || ifp == NULL) { 1774 panic("invalid argument to %s", __func__); 1775 /*NOTREACHED*/ 1776 } 1777 1778 /* address must be specified on ADD and DELETE */ 1779 sa = sstocsa(&ifap->ifap_addr); 1780 if (sa->sa_family != sofamily(so)) 1781 return EINVAL; 1782 if ((any = sockaddr_any(sa)) == NULL || sa->sa_len != any->sa_len) 1783 return EINVAL; 1784 1785 sockaddr_externalize(&v.sa, sizeof(v.ss), sa); 1786 1787 IFADDR_FOREACH(ifa, ifp) { 1788 if (ifa->ifa_addr->sa_family != sa->sa_family) 1789 continue; 1790 sockaddr_externalize(&u.sa, sizeof(u.ss), ifa->ifa_addr); 1791 if (sockaddr_cmp(&u.sa, &v.sa) == 0) 1792 break; 1793 } 1794 if (ifa == NULL) 1795 return EADDRNOTAVAIL; 1796 1797 switch (cmd) { 1798 case SIOCSIFADDRPREF: 1799 ifa->ifa_preference = ifap->ifap_preference; 1800 return 0; 1801 case SIOCGIFADDRPREF: 1802 /* fill in the if_laddrreq structure */ 1803 (void)sockaddr_copy(sstosa(&ifap->ifap_addr), 1804 sizeof(ifap->ifap_addr), ifa->ifa_addr); 1805 ifap->ifap_preference = ifa->ifa_preference; 1806 return 0; 1807 default: 1808 return EOPNOTSUPP; 1809 } 1810 } 1811 1812 static void 1813 ifnet_lock_enter(struct ifnet_lock *il) 1814 { 1815 uint64_t *nenter; 1816 1817 /* Before trying to acquire the mutex, increase the count of threads 1818 * who have entered or who wait to enter the critical section. 1819 * Avoid one costly locked memory transaction by keeping a count for 1820 * each CPU. 1821 */ 1822 nenter = percpu_getref(il->il_nenter); 1823 (*nenter)++; 1824 percpu_putref(il->il_nenter); 1825 mutex_enter(&il->il_lock); 1826 } 1827 1828 static void 1829 ifnet_lock_exit(struct ifnet_lock *il) 1830 { 1831 /* Increase the count of threads who have exited the critical 1832 * section. Increase while we still hold the lock. 1833 */ 1834 il->il_nexit++; 1835 mutex_exit(&il->il_lock); 1836 } 1837 1838 /* 1839 * Interface ioctls. 1840 */ 1841 static int 1842 doifioctl(struct socket *so, u_long cmd, void *data, struct lwp *l) 1843 { 1844 struct ifnet *ifp; 1845 struct ifreq *ifr; 1846 int error = 0; 1847 #if defined(COMPAT_OSOCK) || defined(COMPAT_OIFREQ) 1848 u_long ocmd = cmd; 1849 #endif 1850 short oif_flags; 1851 #ifdef COMPAT_OIFREQ 1852 struct ifreq ifrb; 1853 struct oifreq *oifr = NULL; 1854 #endif 1855 int r; 1856 1857 switch (cmd) { 1858 #ifdef COMPAT_OIFREQ 1859 case OSIOCGIFCONF: 1860 case OOSIOCGIFCONF: 1861 return compat_ifconf(cmd, data); 1862 #endif 1863 #ifdef COMPAT_OIFDATA 1864 case OSIOCGIFDATA: 1865 case OSIOCZIFDATA: 1866 return compat_ifdatareq(l, cmd, data); 1867 #endif 1868 case SIOCGIFCONF: 1869 return ifconf(cmd, data); 1870 case SIOCINITIFADDR: 1871 return EPERM; 1872 } 1873 1874 #ifdef COMPAT_OIFREQ 1875 cmd = compat_cvtcmd(cmd); 1876 if (cmd != ocmd) { 1877 oifr = data; 1878 data = ifr = &ifrb; 1879 ifreqo2n(oifr, ifr); 1880 } else 1881 #endif 1882 ifr = data; 1883 1884 ifp = ifunit(ifr->ifr_name); 1885 1886 switch (cmd) { 1887 case SIOCIFCREATE: 1888 case SIOCIFDESTROY: 1889 if (l != NULL) { 1890 error = kauth_authorize_network(l->l_cred, 1891 KAUTH_NETWORK_INTERFACE, 1892 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1893 (void *)cmd, NULL); 1894 if (error != 0) 1895 return error; 1896 } 1897 mutex_enter(&if_clone_mtx); 1898 r = (cmd == SIOCIFCREATE) ? 1899 if_clone_create(ifr->ifr_name) : 1900 if_clone_destroy(ifr->ifr_name); 1901 mutex_exit(&if_clone_mtx); 1902 return r; 1903 1904 case SIOCIFGCLONERS: 1905 return if_clone_list((struct if_clonereq *)data); 1906 } 1907 1908 if (ifp == NULL) 1909 return ENXIO; 1910 1911 switch (cmd) { 1912 case SIOCALIFADDR: 1913 case SIOCDLIFADDR: 1914 case SIOCSIFADDRPREF: 1915 case SIOCSIFFLAGS: 1916 case SIOCSIFCAP: 1917 case SIOCSIFMETRIC: 1918 case SIOCZIFDATA: 1919 case SIOCSIFMTU: 1920 case SIOCSIFPHYADDR: 1921 case SIOCDIFPHYADDR: 1922 #ifdef INET6 1923 case SIOCSIFPHYADDR_IN6: 1924 #endif 1925 case SIOCSLIFPHYADDR: 1926 case SIOCADDMULTI: 1927 case SIOCDELMULTI: 1928 case SIOCSIFMEDIA: 1929 case SIOCSDRVSPEC: 1930 case SIOCG80211: 1931 case SIOCS80211: 1932 case SIOCS80211NWID: 1933 case SIOCS80211NWKEY: 1934 case SIOCS80211POWER: 1935 case SIOCS80211BSSID: 1936 case SIOCS80211CHANNEL: 1937 case SIOCSLINKSTR: 1938 if (l != NULL) { 1939 error = kauth_authorize_network(l->l_cred, 1940 KAUTH_NETWORK_INTERFACE, 1941 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1942 (void *)cmd, NULL); 1943 if (error != 0) 1944 return error; 1945 } 1946 } 1947 1948 oif_flags = ifp->if_flags; 1949 1950 ifnet_lock_enter(ifp->if_ioctl_lock); 1951 error = (*ifp->if_ioctl)(ifp, cmd, data); 1952 if (error != ENOTTY) 1953 ; 1954 else if (so->so_proto == NULL) 1955 error = EOPNOTSUPP; 1956 else { 1957 #ifdef COMPAT_OSOCK 1958 error = compat_ifioctl(so, ocmd, cmd, data, l); 1959 #else 1960 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, 1961 cmd, data, ifp); 1962 #endif 1963 } 1964 1965 if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) { 1966 #ifdef INET6 1967 if (in6_present && (ifp->if_flags & IFF_UP) != 0) { 1968 int s = splnet(); 1969 in6_if_up(ifp); 1970 splx(s); 1971 } 1972 #endif 1973 } 1974 #ifdef COMPAT_OIFREQ 1975 if (cmd != ocmd) 1976 ifreqn2o(oifr, ifr); 1977 #endif 1978 1979 ifnet_lock_exit(ifp->if_ioctl_lock); 1980 return error; 1981 } 1982 1983 /* This callback adds to the sum in `arg' the number of 1984 * threads on `ci' who have entered or who wait to enter the 1985 * critical section. 1986 */ 1987 static void 1988 ifnet_lock_sum(void *p, void *arg, struct cpu_info *ci) 1989 { 1990 uint64_t *sum = arg, *nenter = p; 1991 1992 *sum += *nenter; 1993 } 1994 1995 /* Return the number of threads who have entered or who wait 1996 * to enter the critical section on all CPUs. 1997 */ 1998 static uint64_t 1999 ifnet_lock_entrances(struct ifnet_lock *il) 2000 { 2001 uint64_t sum = 0; 2002 2003 percpu_foreach(il->il_nenter, ifnet_lock_sum, &sum); 2004 2005 return sum; 2006 } 2007 2008 static int 2009 ifioctl_attach(struct ifnet *ifp) 2010 { 2011 struct ifnet_lock *il; 2012 2013 /* If the driver has not supplied its own if_ioctl, then 2014 * supply the default. 2015 */ 2016 if (ifp->if_ioctl == NULL) 2017 ifp->if_ioctl = ifioctl_common; 2018 2019 /* Create an ifnet_lock for synchronizing ifioctls. */ 2020 if ((il = kmem_zalloc(sizeof(*il), KM_SLEEP)) == NULL) 2021 return ENOMEM; 2022 2023 il->il_nenter = percpu_alloc(sizeof(uint64_t)); 2024 if (il->il_nenter == NULL) { 2025 kmem_free(il, sizeof(*il)); 2026 return ENOMEM; 2027 } 2028 2029 mutex_init(&il->il_lock, MUTEX_DEFAULT, IPL_NONE); 2030 cv_init(&il->il_emptied, ifp->if_xname); 2031 2032 ifp->if_ioctl_lock = il; 2033 2034 return 0; 2035 } 2036 2037 /* 2038 * This must not be called until after `ifp' has been withdrawn from the 2039 * ifnet tables so that ifioctl() cannot get a handle on it by calling 2040 * ifunit(). 2041 */ 2042 static void 2043 ifioctl_detach(struct ifnet *ifp) 2044 { 2045 struct ifnet_lock *il; 2046 2047 il = ifp->if_ioctl_lock; 2048 mutex_enter(&il->il_lock); 2049 /* Install if_nullioctl to make sure that any thread that 2050 * subsequently enters the critical section will quit it 2051 * immediately and signal the condition variable that we 2052 * wait on, below. 2053 */ 2054 ifp->if_ioctl = if_nullioctl; 2055 /* Sleep while threads are still in the critical section or 2056 * wait to enter it. 2057 */ 2058 while (ifnet_lock_entrances(il) != il->il_nexit) 2059 cv_wait(&il->il_emptied, &il->il_lock); 2060 /* At this point, we are the only thread still in the critical 2061 * section, and no new thread can get a handle on the ifioctl 2062 * lock, so it is safe to free its memory. 2063 */ 2064 mutex_exit(&il->il_lock); 2065 ifp->if_ioctl_lock = NULL; 2066 percpu_free(il->il_nenter, sizeof(uint64_t)); 2067 il->il_nenter = NULL; 2068 cv_destroy(&il->il_emptied); 2069 mutex_destroy(&il->il_lock); 2070 kmem_free(il, sizeof(*il)); 2071 } 2072 2073 /* 2074 * Return interface configuration 2075 * of system. List may be used 2076 * in later ioctl's (above) to get 2077 * other information. 2078 * 2079 * Each record is a struct ifreq. Before the addition of 2080 * sockaddr_storage, the API rule was that sockaddr flavors that did 2081 * not fit would extend beyond the struct ifreq, with the next struct 2082 * ifreq starting sa_len beyond the struct sockaddr. Because the 2083 * union in struct ifreq includes struct sockaddr_storage, every kind 2084 * of sockaddr must fit. Thus, there are no longer any overlength 2085 * records. 2086 * 2087 * Records are added to the user buffer if they fit, and ifc_len is 2088 * adjusted to the length that was written. Thus, the user is only 2089 * assured of getting the complete list if ifc_len on return is at 2090 * least sizeof(struct ifreq) less than it was on entry. 2091 * 2092 * If the user buffer pointer is NULL, this routine copies no data and 2093 * returns the amount of space that would be needed. 2094 * 2095 * Invariants: 2096 * ifrp points to the next part of the user's buffer to be used. If 2097 * ifrp != NULL, space holds the number of bytes remaining that we may 2098 * write at ifrp. Otherwise, space holds the number of bytes that 2099 * would have been written had there been adequate space. 2100 */ 2101 /*ARGSUSED*/ 2102 int 2103 ifconf(u_long cmd, void *data) 2104 { 2105 struct ifconf *ifc = (struct ifconf *)data; 2106 struct ifnet *ifp; 2107 struct ifaddr *ifa; 2108 struct ifreq ifr, *ifrp; 2109 int space, error = 0; 2110 const int sz = (int)sizeof(struct ifreq); 2111 2112 if ((ifrp = ifc->ifc_req) == NULL) 2113 space = 0; 2114 else 2115 space = ifc->ifc_len; 2116 IFNET_FOREACH(ifp) { 2117 (void)strncpy(ifr.ifr_name, ifp->if_xname, 2118 sizeof(ifr.ifr_name)); 2119 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') 2120 return ENAMETOOLONG; 2121 if (IFADDR_EMPTY(ifp)) { 2122 /* Interface with no addresses - send zero sockaddr. */ 2123 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr)); 2124 if (ifrp == NULL) { 2125 space += sz; 2126 continue; 2127 } 2128 if (space >= sz) { 2129 error = copyout(&ifr, ifrp, sz); 2130 if (error != 0) 2131 return error; 2132 ifrp++; 2133 space -= sz; 2134 } 2135 } 2136 2137 IFADDR_FOREACH(ifa, ifp) { 2138 struct sockaddr *sa = ifa->ifa_addr; 2139 /* all sockaddrs must fit in sockaddr_storage */ 2140 KASSERT(sa->sa_len <= sizeof(ifr.ifr_ifru)); 2141 2142 if (ifrp == NULL) { 2143 space += sz; 2144 continue; 2145 } 2146 memcpy(&ifr.ifr_space, sa, sa->sa_len); 2147 if (space >= sz) { 2148 error = copyout(&ifr, ifrp, sz); 2149 if (error != 0) 2150 return (error); 2151 ifrp++; space -= sz; 2152 } 2153 } 2154 } 2155 if (ifrp != NULL) { 2156 KASSERT(0 <= space && space <= ifc->ifc_len); 2157 ifc->ifc_len -= space; 2158 } else { 2159 KASSERT(space >= 0); 2160 ifc->ifc_len = space; 2161 } 2162 return (0); 2163 } 2164 2165 int 2166 ifreq_setaddr(u_long cmd, struct ifreq *ifr, const struct sockaddr *sa) 2167 { 2168 uint8_t len; 2169 #ifdef COMPAT_OIFREQ 2170 struct ifreq ifrb; 2171 struct oifreq *oifr = NULL; 2172 u_long ocmd = cmd; 2173 cmd = compat_cvtcmd(cmd); 2174 if (cmd != ocmd) { 2175 oifr = (struct oifreq *)(void *)ifr; 2176 ifr = &ifrb; 2177 ifreqo2n(oifr, ifr); 2178 len = sizeof(oifr->ifr_addr); 2179 } else 2180 #endif 2181 len = sizeof(ifr->ifr_ifru.ifru_space); 2182 2183 if (len < sa->sa_len) 2184 return EFBIG; 2185 2186 memset(&ifr->ifr_addr, 0, len); 2187 sockaddr_copy(&ifr->ifr_addr, len, sa); 2188 2189 #ifdef COMPAT_OIFREQ 2190 if (cmd != ocmd) 2191 ifreqn2o(oifr, ifr); 2192 #endif 2193 return 0; 2194 } 2195 2196 /* 2197 * Queue message on interface, and start output if interface 2198 * not yet active. 2199 */ 2200 int 2201 ifq_enqueue(struct ifnet *ifp, struct mbuf *m 2202 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 2203 { 2204 int len = m->m_pkthdr.len; 2205 int mflags = m->m_flags; 2206 int s = splnet(); 2207 int error; 2208 2209 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 2210 if (error != 0) 2211 goto out; 2212 ifp->if_obytes += len; 2213 if (mflags & M_MCAST) 2214 ifp->if_omcasts++; 2215 if ((ifp->if_flags & IFF_OACTIVE) == 0) 2216 (*ifp->if_start)(ifp); 2217 out: 2218 splx(s); 2219 return error; 2220 } 2221 2222 /* 2223 * Queue message on interface, possibly using a second fast queue 2224 */ 2225 int 2226 ifq_enqueue2(struct ifnet *ifp, struct ifqueue *ifq, struct mbuf *m 2227 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 2228 { 2229 int error = 0; 2230 2231 if (ifq != NULL 2232 #ifdef ALTQ 2233 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 2234 #endif 2235 ) { 2236 if (IF_QFULL(ifq)) { 2237 IF_DROP(&ifp->if_snd); 2238 m_freem(m); 2239 if (error == 0) 2240 error = ENOBUFS; 2241 } else 2242 IF_ENQUEUE(ifq, m); 2243 } else 2244 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 2245 if (error != 0) { 2246 ++ifp->if_oerrors; 2247 return error; 2248 } 2249 return 0; 2250 } 2251 2252 int 2253 if_addr_init(ifnet_t *ifp, struct ifaddr *ifa, const bool src) 2254 { 2255 int rc; 2256 2257 if (ifp->if_initaddr != NULL) 2258 rc = (*ifp->if_initaddr)(ifp, ifa, src); 2259 else if (src || 2260 (rc = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ifa)) == ENOTTY) 2261 rc = (*ifp->if_ioctl)(ifp, SIOCINITIFADDR, ifa); 2262 2263 return rc; 2264 } 2265 2266 int 2267 if_flags_set(ifnet_t *ifp, const short flags) 2268 { 2269 int rc; 2270 2271 if (ifp->if_setflags != NULL) 2272 rc = (*ifp->if_setflags)(ifp, flags); 2273 else { 2274 short cantflags, chgdflags; 2275 struct ifreq ifr; 2276 2277 chgdflags = ifp->if_flags ^ flags; 2278 cantflags = chgdflags & IFF_CANTCHANGE; 2279 2280 if (cantflags != 0) 2281 ifp->if_flags ^= cantflags; 2282 2283 /* Traditionally, we do not call if_ioctl after 2284 * setting/clearing only IFF_PROMISC if the interface 2285 * isn't IFF_UP. Uphold that tradition. 2286 */ 2287 if (chgdflags == IFF_PROMISC && (ifp->if_flags & IFF_UP) == 0) 2288 return 0; 2289 2290 memset(&ifr, 0, sizeof(ifr)); 2291 2292 ifr.ifr_flags = flags & ~IFF_CANTCHANGE; 2293 rc = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, &ifr); 2294 2295 if (rc != 0 && cantflags != 0) 2296 ifp->if_flags ^= cantflags; 2297 } 2298 2299 return rc; 2300 } 2301 2302 int 2303 if_mcast_op(ifnet_t *ifp, const unsigned long cmd, const struct sockaddr *sa) 2304 { 2305 int rc; 2306 struct ifreq ifr; 2307 2308 if (ifp->if_mcastop != NULL) 2309 rc = (*ifp->if_mcastop)(ifp, cmd, sa); 2310 else { 2311 ifreq_setaddr(cmd, &ifr, sa); 2312 rc = (*ifp->if_ioctl)(ifp, cmd, &ifr); 2313 } 2314 2315 return rc; 2316 } 2317 2318 static void 2319 sysctl_sndq_setup(struct sysctllog **clog, const char *ifname, 2320 struct ifaltq *ifq) 2321 { 2322 const struct sysctlnode *cnode, *rnode; 2323 2324 if (sysctl_createv(clog, 0, NULL, &rnode, 2325 CTLFLAG_PERMANENT, 2326 CTLTYPE_NODE, "interfaces", 2327 SYSCTL_DESCR("Per-interface controls"), 2328 NULL, 0, NULL, 0, 2329 CTL_NET, CTL_CREATE, CTL_EOL) != 0) 2330 goto bad; 2331 2332 if (sysctl_createv(clog, 0, &rnode, &rnode, 2333 CTLFLAG_PERMANENT, 2334 CTLTYPE_NODE, ifname, 2335 SYSCTL_DESCR("Interface controls"), 2336 NULL, 0, NULL, 0, 2337 CTL_CREATE, CTL_EOL) != 0) 2338 goto bad; 2339 2340 if (sysctl_createv(clog, 0, &rnode, &rnode, 2341 CTLFLAG_PERMANENT, 2342 CTLTYPE_NODE, "sndq", 2343 SYSCTL_DESCR("Interface output queue controls"), 2344 NULL, 0, NULL, 0, 2345 CTL_CREATE, CTL_EOL) != 0) 2346 goto bad; 2347 2348 if (sysctl_createv(clog, 0, &rnode, &cnode, 2349 CTLFLAG_PERMANENT, 2350 CTLTYPE_INT, "len", 2351 SYSCTL_DESCR("Current output queue length"), 2352 NULL, 0, &ifq->ifq_len, 0, 2353 CTL_CREATE, CTL_EOL) != 0) 2354 goto bad; 2355 2356 if (sysctl_createv(clog, 0, &rnode, &cnode, 2357 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2358 CTLTYPE_INT, "maxlen", 2359 SYSCTL_DESCR("Maximum allowed output queue length"), 2360 NULL, 0, &ifq->ifq_maxlen, 0, 2361 CTL_CREATE, CTL_EOL) != 0) 2362 goto bad; 2363 2364 if (sysctl_createv(clog, 0, &rnode, &cnode, 2365 CTLFLAG_PERMANENT, 2366 CTLTYPE_INT, "drops", 2367 SYSCTL_DESCR("Packets dropped due to full output queue"), 2368 NULL, 0, &ifq->ifq_drops, 0, 2369 CTL_CREATE, CTL_EOL) != 0) 2370 goto bad; 2371 2372 return; 2373 bad: 2374 printf("%s: could not attach sysctl nodes\n", ifname); 2375 return; 2376 } 2377 2378 #if defined(INET) || defined(INET6) 2379 2380 #define SYSCTL_NET_PKTQ(q, cn, c) \ 2381 static int \ 2382 sysctl_net_##q##_##cn(SYSCTLFN_ARGS) \ 2383 { \ 2384 return sysctl_pktq_count(SYSCTLFN_CALL(rnode), q, c); \ 2385 } 2386 2387 #if defined(INET) 2388 static int 2389 sysctl_net_ip_pktq_maxlen(SYSCTLFN_ARGS) 2390 { 2391 return sysctl_pktq_maxlen(SYSCTLFN_CALL(rnode), ip_pktq); 2392 } 2393 SYSCTL_NET_PKTQ(ip_pktq, items, PKTQ_NITEMS) 2394 SYSCTL_NET_PKTQ(ip_pktq, drops, PKTQ_DROPS) 2395 #endif 2396 2397 #if defined(INET6) 2398 static int 2399 sysctl_net_ip6_pktq_maxlen(SYSCTLFN_ARGS) 2400 { 2401 return sysctl_pktq_maxlen(SYSCTLFN_CALL(rnode), ip6_pktq); 2402 } 2403 SYSCTL_NET_PKTQ(ip6_pktq, items, PKTQ_NITEMS) 2404 SYSCTL_NET_PKTQ(ip6_pktq, drops, PKTQ_DROPS) 2405 #endif 2406 2407 static void 2408 sysctl_net_pktq_setup(struct sysctllog **clog, int pf) 2409 { 2410 sysctlfn len_func = NULL, maxlen_func = NULL, drops_func = NULL; 2411 const char *pfname = NULL, *ipname = NULL; 2412 int ipn = 0, qid = 0; 2413 2414 switch (pf) { 2415 #if defined(INET) 2416 case PF_INET: 2417 len_func = sysctl_net_ip_pktq_items; 2418 maxlen_func = sysctl_net_ip_pktq_maxlen; 2419 drops_func = sysctl_net_ip_pktq_drops; 2420 pfname = "inet", ipn = IPPROTO_IP; 2421 ipname = "ip", qid = IPCTL_IFQ; 2422 break; 2423 #endif 2424 #if defined(INET6) 2425 case PF_INET6: 2426 len_func = sysctl_net_ip6_pktq_items; 2427 maxlen_func = sysctl_net_ip6_pktq_maxlen; 2428 drops_func = sysctl_net_ip6_pktq_drops; 2429 pfname = "inet6", ipn = IPPROTO_IPV6; 2430 ipname = "ip6", qid = IPV6CTL_IFQ; 2431 break; 2432 #endif 2433 default: 2434 KASSERT(false); 2435 } 2436 2437 sysctl_createv(clog, 0, NULL, NULL, 2438 CTLFLAG_PERMANENT, 2439 CTLTYPE_NODE, pfname, NULL, 2440 NULL, 0, NULL, 0, 2441 CTL_NET, pf, CTL_EOL); 2442 sysctl_createv(clog, 0, NULL, NULL, 2443 CTLFLAG_PERMANENT, 2444 CTLTYPE_NODE, ipname, NULL, 2445 NULL, 0, NULL, 0, 2446 CTL_NET, pf, ipn, CTL_EOL); 2447 sysctl_createv(clog, 0, NULL, NULL, 2448 CTLFLAG_PERMANENT, 2449 CTLTYPE_NODE, "ifq", 2450 SYSCTL_DESCR("Protocol input queue controls"), 2451 NULL, 0, NULL, 0, 2452 CTL_NET, pf, ipn, qid, CTL_EOL); 2453 2454 sysctl_createv(clog, 0, NULL, NULL, 2455 CTLFLAG_PERMANENT, 2456 CTLTYPE_INT, "len", 2457 SYSCTL_DESCR("Current input queue length"), 2458 len_func, 0, NULL, 0, 2459 CTL_NET, pf, ipn, qid, IFQCTL_LEN, CTL_EOL); 2460 sysctl_createv(clog, 0, NULL, NULL, 2461 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2462 CTLTYPE_INT, "maxlen", 2463 SYSCTL_DESCR("Maximum allowed input queue length"), 2464 maxlen_func, 0, NULL, 0, 2465 CTL_NET, pf, ipn, qid, IFQCTL_MAXLEN, CTL_EOL); 2466 sysctl_createv(clog, 0, NULL, NULL, 2467 CTLFLAG_PERMANENT, 2468 CTLTYPE_INT, "drops", 2469 SYSCTL_DESCR("Packets dropped due to full input queue"), 2470 drops_func, 0, NULL, 0, 2471 CTL_NET, pf, ipn, qid, IFQCTL_DROPS, CTL_EOL); 2472 } 2473 #endif /* INET || INET6 */ 2474 2475 static int 2476 if_sdl_sysctl(SYSCTLFN_ARGS) 2477 { 2478 struct ifnet *ifp; 2479 const struct sockaddr_dl *sdl; 2480 2481 if (namelen != 1) 2482 return EINVAL; 2483 2484 ifp = if_byindex(name[0]); 2485 if (ifp == NULL) 2486 return ENODEV; 2487 2488 sdl = ifp->if_sadl; 2489 if (sdl == NULL) { 2490 *oldlenp = 0; 2491 return 0; 2492 } 2493 2494 if (oldp == NULL) { 2495 *oldlenp = sdl->sdl_alen; 2496 return 0; 2497 } 2498 2499 if (*oldlenp >= sdl->sdl_alen) 2500 *oldlenp = sdl->sdl_alen; 2501 return sysctl_copyout(l, &sdl->sdl_data[sdl->sdl_nlen], oldp, *oldlenp); 2502 } 2503 2504 SYSCTL_SETUP(sysctl_net_sdl_setup, "sysctl net.sdl subtree setup") 2505 { 2506 const struct sysctlnode *rnode = NULL; 2507 2508 sysctl_createv(clog, 0, NULL, &rnode, 2509 CTLFLAG_PERMANENT, 2510 CTLTYPE_NODE, "sdl", 2511 SYSCTL_DESCR("Get active link-layer address"), 2512 if_sdl_sysctl, 0, NULL, 0, 2513 CTL_NET, CTL_CREATE, CTL_EOL); 2514 } 2515
Indexes created Tue Sep 23 14:10:03 GMT 2025