if.c revision 1.284
1 /* $NetBSD: if.c,v 1.284 2014/07/01 05:49:18 rtr 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 1.284 2014/07/01 05:49:18 rtr Exp $"); 94 95 #include "opt_inet.h" 96 97 #include "opt_atalk.h" 98 #include "opt_natm.h" 99 100 #include <sys/param.h> 101 #include <sys/mbuf.h> 102 #include <sys/systm.h> 103 #include <sys/callout.h> 104 #include <sys/proc.h> 105 #include <sys/socket.h> 106 #include <sys/socketvar.h> 107 #include <sys/domain.h> 108 #include <sys/protosw.h> 109 #include <sys/kernel.h> 110 #include <sys/ioctl.h> 111 #include <sys/sysctl.h> 112 #include <sys/syslog.h> 113 #include <sys/kauth.h> 114 #include <sys/kmem.h> 115 #include <sys/xcall.h> 116 117 #include <net/if.h> 118 #include <net/if_dl.h> 119 #include <net/if_ether.h> 120 #include <net/if_media.h> 121 #include <net80211/ieee80211.h> 122 #include <net80211/ieee80211_ioctl.h> 123 #include <net/if_types.h> 124 #include <net/radix.h> 125 #include <net/route.h> 126 #include <net/netisr.h> 127 #include <sys/module.h> 128 #ifdef NETATALK 129 #include <netatalk/at_extern.h> 130 #include <netatalk/at.h> 131 #endif 132 #include <net/pfil.h> 133 #include <netinet/in.h> 134 #include <netinet/in_var.h> 135 136 #ifdef INET6 137 #include <netinet6/in6_var.h> 138 #include <netinet6/nd6.h> 139 #endif 140 141 #include "carp.h" 142 #if NCARP > 0 143 #include <netinet/ip_carp.h> 144 #endif 145 146 #include <compat/sys/sockio.h> 147 #include <compat/sys/socket.h> 148 149 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 150 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 151 152 /* 153 * Global list of interfaces. 154 */ 155 struct ifnet_head ifnet_list; 156 static ifnet_t ** ifindex2ifnet = NULL; 157 158 static u_int if_index = 1; 159 static size_t if_indexlim = 0; 160 static uint64_t index_gen; 161 static kmutex_t index_gen_mtx; 162 163 static struct ifaddr ** ifnet_addrs = NULL; 164 165 static callout_t if_slowtimo_ch; 166 167 struct ifnet *lo0ifp; 168 int ifqmaxlen = IFQ_MAXLEN; 169 170 static int if_rt_walktree(struct rtentry *, void *); 171 172 static struct if_clone *if_clone_lookup(const char *, int *); 173 static int if_clone_list(struct if_clonereq *); 174 175 static LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 176 static int if_cloners_count; 177 178 /* Packet filtering hook for interfaces. */ 179 pfil_head_t * if_pfil; 180 181 static kauth_listener_t if_listener; 182 183 static int doifioctl(struct socket *, u_long, void *, struct lwp *); 184 static int ifioctl_attach(struct ifnet *); 185 static void ifioctl_detach(struct ifnet *); 186 static void ifnet_lock_enter(struct ifnet_lock *); 187 static void ifnet_lock_exit(struct ifnet_lock *); 188 static void if_detach_queues(struct ifnet *, struct ifqueue *); 189 static void sysctl_sndq_setup(struct sysctllog **, const char *, 190 struct ifaltq *); 191 192 #if defined(INET) || defined(INET6) 193 static void sysctl_net_pktq_setup(struct sysctllog **, int); 194 #endif 195 196 static int 197 if_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 198 void *arg0, void *arg1, void *arg2, void *arg3) 199 { 200 int result; 201 enum kauth_network_req req; 202 203 result = KAUTH_RESULT_DEFER; 204 req = (enum kauth_network_req)arg1; 205 206 if (action != KAUTH_NETWORK_INTERFACE) 207 return result; 208 209 if ((req == KAUTH_REQ_NETWORK_INTERFACE_GET) || 210 (req == KAUTH_REQ_NETWORK_INTERFACE_SET)) 211 result = KAUTH_RESULT_ALLOW; 212 213 return result; 214 } 215 216 /* 217 * Network interface utility routines. 218 * 219 * Routines with ifa_ifwith* names take sockaddr *'s as 220 * parameters. 221 */ 222 void 223 ifinit(void) 224 { 225 #if defined(INET) 226 sysctl_net_pktq_setup(NULL, PF_INET); 227 #endif 228 #ifdef INET6 229 sysctl_net_pktq_setup(NULL, PF_INET6); 230 #endif 231 232 callout_init(&if_slowtimo_ch, 0); 233 if_slowtimo(NULL); 234 235 if_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 236 if_listener_cb, NULL); 237 238 /* interfaces are available, inform socket code */ 239 ifioctl = doifioctl; 240 } 241 242 /* 243 * XXX Initialization before configure(). 244 * XXX hack to get pfil_add_hook working in autoconf. 245 */ 246 void 247 ifinit1(void) 248 { 249 mutex_init(&index_gen_mtx, MUTEX_DEFAULT, IPL_NONE); 250 TAILQ_INIT(&ifnet_list); 251 if_indexlim = 8; 252 253 if_pfil = pfil_head_create(PFIL_TYPE_IFNET, NULL); 254 KASSERT(if_pfil != NULL); 255 } 256 257 ifnet_t * 258 if_alloc(u_char type) 259 { 260 return kmem_zalloc(sizeof(ifnet_t), KM_SLEEP); 261 } 262 263 void 264 if_free(ifnet_t *ifp) 265 { 266 kmem_free(ifp, sizeof(ifnet_t)); 267 } 268 269 void 270 if_initname(struct ifnet *ifp, const char *name, int unit) 271 { 272 (void)snprintf(ifp->if_xname, sizeof(ifp->if_xname), 273 "%s%d", name, unit); 274 } 275 276 /* 277 * Null routines used while an interface is going away. These routines 278 * just return an error. 279 */ 280 281 int 282 if_nulloutput(struct ifnet *ifp, struct mbuf *m, 283 const struct sockaddr *so, struct rtentry *rt) 284 { 285 286 return ENXIO; 287 } 288 289 void 290 if_nullinput(struct ifnet *ifp, struct mbuf *m) 291 { 292 293 /* Nothing. */ 294 } 295 296 void 297 if_nullstart(struct ifnet *ifp) 298 { 299 300 /* Nothing. */ 301 } 302 303 int 304 if_nullioctl(struct ifnet *ifp, u_long cmd, void *data) 305 { 306 307 /* Wake ifioctl_detach(), who may wait for all threads to 308 * quit the critical section. 309 */ 310 cv_signal(&ifp->if_ioctl_lock->il_emptied); 311 return ENXIO; 312 } 313 314 int 315 if_nullinit(struct ifnet *ifp) 316 { 317 318 return ENXIO; 319 } 320 321 void 322 if_nullstop(struct ifnet *ifp, int disable) 323 { 324 325 /* Nothing. */ 326 } 327 328 void 329 if_nullwatchdog(struct ifnet *ifp) 330 { 331 332 /* Nothing. */ 333 } 334 335 void 336 if_nulldrain(struct ifnet *ifp) 337 { 338 339 /* Nothing. */ 340 } 341 342 void 343 if_set_sadl(struct ifnet *ifp, const void *lla, u_char addrlen, bool factory) 344 { 345 struct ifaddr *ifa; 346 struct sockaddr_dl *sdl; 347 348 ifp->if_addrlen = addrlen; 349 if_alloc_sadl(ifp); 350 ifa = ifp->if_dl; 351 sdl = satosdl(ifa->ifa_addr); 352 353 (void)sockaddr_dl_setaddr(sdl, sdl->sdl_len, lla, ifp->if_addrlen); 354 if (factory) { 355 ifp->if_hwdl = ifp->if_dl; 356 IFAREF(ifp->if_hwdl); 357 } 358 /* TBD routing socket */ 359 } 360 361 struct ifaddr * 362 if_dl_create(const struct ifnet *ifp, const struct sockaddr_dl **sdlp) 363 { 364 unsigned socksize, ifasize; 365 int addrlen, namelen; 366 struct sockaddr_dl *mask, *sdl; 367 struct ifaddr *ifa; 368 369 namelen = strlen(ifp->if_xname); 370 addrlen = ifp->if_addrlen; 371 socksize = roundup(sockaddr_dl_measure(namelen, addrlen), sizeof(long)); 372 ifasize = sizeof(*ifa) + 2 * socksize; 373 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK|M_ZERO); 374 375 sdl = (struct sockaddr_dl *)(ifa + 1); 376 mask = (struct sockaddr_dl *)(socksize + (char *)sdl); 377 378 sockaddr_dl_init(sdl, socksize, ifp->if_index, ifp->if_type, 379 ifp->if_xname, namelen, NULL, addrlen); 380 mask->sdl_len = sockaddr_dl_measure(namelen, 0); 381 memset(&mask->sdl_data[0], 0xff, namelen); 382 ifa->ifa_rtrequest = link_rtrequest; 383 ifa->ifa_addr = (struct sockaddr *)sdl; 384 ifa->ifa_netmask = (struct sockaddr *)mask; 385 386 *sdlp = sdl; 387 388 return ifa; 389 } 390 391 static void 392 if_sadl_setrefs(struct ifnet *ifp, struct ifaddr *ifa) 393 { 394 const struct sockaddr_dl *sdl; 395 ifnet_addrs[ifp->if_index] = ifa; 396 IFAREF(ifa); 397 ifp->if_dl = ifa; 398 IFAREF(ifa); 399 sdl = satosdl(ifa->ifa_addr); 400 ifp->if_sadl = sdl; 401 } 402 403 /* 404 * Allocate the link level name for the specified interface. This 405 * is an attachment helper. It must be called after ifp->if_addrlen 406 * is initialized, which may not be the case when if_attach() is 407 * called. 408 */ 409 void 410 if_alloc_sadl(struct ifnet *ifp) 411 { 412 struct ifaddr *ifa; 413 const struct sockaddr_dl *sdl; 414 415 /* 416 * If the interface already has a link name, release it 417 * now. This is useful for interfaces that can change 418 * link types, and thus switch link names often. 419 */ 420 if (ifp->if_sadl != NULL) 421 if_free_sadl(ifp); 422 423 ifa = if_dl_create(ifp, &sdl); 424 425 ifa_insert(ifp, ifa); 426 if_sadl_setrefs(ifp, ifa); 427 } 428 429 static void 430 if_deactivate_sadl(struct ifnet *ifp) 431 { 432 struct ifaddr *ifa; 433 434 KASSERT(ifp->if_dl != NULL); 435 436 ifa = ifp->if_dl; 437 438 ifp->if_sadl = NULL; 439 440 ifnet_addrs[ifp->if_index] = NULL; 441 IFAFREE(ifa); 442 ifp->if_dl = NULL; 443 IFAFREE(ifa); 444 } 445 446 void 447 if_activate_sadl(struct ifnet *ifp, struct ifaddr *ifa, 448 const struct sockaddr_dl *sdl) 449 { 450 int s; 451 452 s = splnet(); 453 454 if_deactivate_sadl(ifp); 455 456 if_sadl_setrefs(ifp, ifa); 457 IFADDR_FOREACH(ifa, ifp) 458 rtinit(ifa, RTM_LLINFO_UPD, 0); 459 splx(s); 460 } 461 462 /* 463 * Free the link level name for the specified interface. This is 464 * a detach helper. This is called from if_detach() or from 465 * link layer type specific detach functions. 466 */ 467 void 468 if_free_sadl(struct ifnet *ifp) 469 { 470 struct ifaddr *ifa; 471 int s; 472 473 ifa = ifnet_addrs[ifp->if_index]; 474 if (ifa == NULL) { 475 KASSERT(ifp->if_sadl == NULL); 476 KASSERT(ifp->if_dl == NULL); 477 return; 478 } 479 480 KASSERT(ifp->if_sadl != NULL); 481 KASSERT(ifp->if_dl != NULL); 482 483 s = splnet(); 484 rtinit(ifa, RTM_DELETE, 0); 485 ifa_remove(ifp, ifa); 486 if_deactivate_sadl(ifp); 487 if (ifp->if_hwdl == ifa) { 488 IFAFREE(ifa); 489 ifp->if_hwdl = NULL; 490 } 491 splx(s); 492 } 493 494 static void 495 if_getindex(ifnet_t *ifp) 496 { 497 bool hitlimit = false; 498 499 mutex_enter(&index_gen_mtx); 500 ifp->if_index_gen = index_gen++; 501 mutex_exit(&index_gen_mtx); 502 503 ifp->if_index = if_index; 504 if (ifindex2ifnet == NULL) { 505 if_index++; 506 goto skip; 507 } 508 while (if_byindex(ifp->if_index)) { 509 /* 510 * If we hit USHRT_MAX, we skip back to 0 since 511 * there are a number of places where the value 512 * of if_index or if_index itself is compared 513 * to or stored in an unsigned short. By 514 * jumping back, we won't botch those assignments 515 * or comparisons. 516 */ 517 if (++if_index == 0) { 518 if_index = 1; 519 } else if (if_index == USHRT_MAX) { 520 /* 521 * However, if we have to jump back to 522 * zero *twice* without finding an empty 523 * slot in ifindex2ifnet[], then there 524 * there are too many (>65535) interfaces. 525 */ 526 if (hitlimit) { 527 panic("too many interfaces"); 528 } 529 hitlimit = true; 530 if_index = 1; 531 } 532 ifp->if_index = if_index; 533 } 534 skip: 535 /* 536 * We have some arrays that should be indexed by if_index. 537 * since if_index will grow dynamically, they should grow too. 538 * struct ifadd **ifnet_addrs 539 * struct ifnet **ifindex2ifnet 540 */ 541 if (ifnet_addrs == NULL || ifindex2ifnet == NULL || 542 ifp->if_index >= if_indexlim) { 543 size_t m, n, oldlim; 544 void *q; 545 546 oldlim = if_indexlim; 547 while (ifp->if_index >= if_indexlim) 548 if_indexlim <<= 1; 549 550 /* grow ifnet_addrs */ 551 m = oldlim * sizeof(struct ifaddr *); 552 n = if_indexlim * sizeof(struct ifaddr *); 553 q = malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 554 if (ifnet_addrs != NULL) { 555 memcpy(q, ifnet_addrs, m); 556 free(ifnet_addrs, M_IFADDR); 557 } 558 ifnet_addrs = (struct ifaddr **)q; 559 560 /* grow ifindex2ifnet */ 561 m = oldlim * sizeof(struct ifnet *); 562 n = if_indexlim * sizeof(struct ifnet *); 563 q = malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 564 if (ifindex2ifnet != NULL) { 565 memcpy(q, ifindex2ifnet, m); 566 free(ifindex2ifnet, M_IFADDR); 567 } 568 ifindex2ifnet = (struct ifnet **)q; 569 } 570 ifindex2ifnet[ifp->if_index] = ifp; 571 } 572 573 /* 574 * Attach an interface to the list of "active" interfaces. 575 */ 576 void 577 if_attach(ifnet_t *ifp) 578 { 579 KASSERT(if_indexlim > 0); 580 TAILQ_INIT(&ifp->if_addrlist); 581 TAILQ_INSERT_TAIL(&ifnet_list, ifp, if_list); 582 583 if (ifioctl_attach(ifp) != 0) 584 panic("%s: ifioctl_attach() failed", __func__); 585 586 if_getindex(ifp); 587 588 /* 589 * Link level name is allocated later by a separate call to 590 * if_alloc_sadl(). 591 */ 592 593 if (ifp->if_snd.ifq_maxlen == 0) 594 ifp->if_snd.ifq_maxlen = ifqmaxlen; 595 596 sysctl_sndq_setup(&ifp->if_sysctl_log, ifp->if_xname, &ifp->if_snd); 597 598 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 599 600 ifp->if_link_state = LINK_STATE_UNKNOWN; 601 602 ifp->if_capenable = 0; 603 ifp->if_csum_flags_tx = 0; 604 ifp->if_csum_flags_rx = 0; 605 606 #ifdef ALTQ 607 ifp->if_snd.altq_type = 0; 608 ifp->if_snd.altq_disc = NULL; 609 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 610 ifp->if_snd.altq_tbr = NULL; 611 ifp->if_snd.altq_ifp = ifp; 612 #endif 613 614 ifp->if_pfil = pfil_head_create(PFIL_TYPE_IFNET, ifp); 615 (void)pfil_run_hooks(if_pfil, 616 (struct mbuf **)PFIL_IFNET_ATTACH, ifp, PFIL_IFNET); 617 618 if (!STAILQ_EMPTY(&domains)) 619 if_attachdomain1(ifp); 620 621 /* Announce the interface. */ 622 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 623 } 624 625 void 626 if_attachdomain(void) 627 { 628 struct ifnet *ifp; 629 int s; 630 631 s = splnet(); 632 IFNET_FOREACH(ifp) 633 if_attachdomain1(ifp); 634 splx(s); 635 } 636 637 void 638 if_attachdomain1(struct ifnet *ifp) 639 { 640 struct domain *dp; 641 int s; 642 643 s = splnet(); 644 645 /* address family dependent data region */ 646 memset(ifp->if_afdata, 0, sizeof(ifp->if_afdata)); 647 DOMAIN_FOREACH(dp) { 648 if (dp->dom_ifattach != NULL) 649 ifp->if_afdata[dp->dom_family] = 650 (*dp->dom_ifattach)(ifp); 651 } 652 653 splx(s); 654 } 655 656 /* 657 * Deactivate an interface. This points all of the procedure 658 * handles at error stubs. May be called from interrupt context. 659 */ 660 void 661 if_deactivate(struct ifnet *ifp) 662 { 663 int s; 664 665 s = splnet(); 666 667 ifp->if_output = if_nulloutput; 668 ifp->if_input = if_nullinput; 669 ifp->if_start = if_nullstart; 670 ifp->if_ioctl = if_nullioctl; 671 ifp->if_init = if_nullinit; 672 ifp->if_stop = if_nullstop; 673 ifp->if_watchdog = if_nullwatchdog; 674 ifp->if_drain = if_nulldrain; 675 676 /* No more packets may be enqueued. */ 677 ifp->if_snd.ifq_maxlen = 0; 678 679 splx(s); 680 } 681 682 void 683 if_purgeaddrs(struct ifnet *ifp, int family, void (*purgeaddr)(struct ifaddr *)) 684 { 685 struct ifaddr *ifa, *nifa; 686 687 for (ifa = IFADDR_FIRST(ifp); ifa != NULL; ifa = nifa) { 688 nifa = IFADDR_NEXT(ifa); 689 if (ifa->ifa_addr->sa_family != family) 690 continue; 691 (*purgeaddr)(ifa); 692 } 693 } 694 695 /* 696 * Detach an interface from the list of "active" interfaces, 697 * freeing any resources as we go along. 698 * 699 * NOTE: This routine must be called with a valid thread context, 700 * as it may block. 701 */ 702 void 703 if_detach(struct ifnet *ifp) 704 { 705 struct socket so; 706 struct ifaddr *ifa; 707 #ifdef IFAREF_DEBUG 708 struct ifaddr *last_ifa = NULL; 709 #endif 710 struct domain *dp; 711 const struct protosw *pr; 712 int s, i, family, purged; 713 uint64_t xc; 714 715 /* 716 * XXX It's kind of lame that we have to have the 717 * XXX socket structure... 718 */ 719 memset(&so, 0, sizeof(so)); 720 721 s = splnet(); 722 723 /* 724 * Do an if_down() to give protocols a chance to do something. 725 */ 726 if_down(ifp); 727 728 #ifdef ALTQ 729 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 730 altq_disable(&ifp->if_snd); 731 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 732 altq_detach(&ifp->if_snd); 733 #endif 734 735 sysctl_teardown(&ifp->if_sysctl_log); 736 737 #if NCARP > 0 738 /* Remove the interface from any carp group it is a part of. */ 739 if (ifp->if_carp != NULL && ifp->if_type != IFT_CARP) 740 carp_ifdetach(ifp); 741 #endif 742 743 /* 744 * Rip all the addresses off the interface. This should make 745 * all of the routes go away. 746 * 747 * pr_usrreq calls can remove an arbitrary number of ifaddrs 748 * from the list, including our "cursor", ifa. For safety, 749 * and to honor the TAILQ abstraction, I just restart the 750 * loop after each removal. Note that the loop will exit 751 * when all of the remaining ifaddrs belong to the AF_LINK 752 * family. I am counting on the historical fact that at 753 * least one pr_usrreq in each address domain removes at 754 * least one ifaddr. 755 */ 756 again: 757 IFADDR_FOREACH(ifa, ifp) { 758 family = ifa->ifa_addr->sa_family; 759 #ifdef IFAREF_DEBUG 760 printf("if_detach: ifaddr %p, family %d, refcnt %d\n", 761 ifa, family, ifa->ifa_refcnt); 762 if (last_ifa != NULL && ifa == last_ifa) 763 panic("if_detach: loop detected"); 764 last_ifa = ifa; 765 #endif 766 if (family == AF_LINK) 767 continue; 768 dp = pffinddomain(family); 769 #ifdef DIAGNOSTIC 770 if (dp == NULL) 771 panic("if_detach: no domain for AF %d", 772 family); 773 #endif 774 /* 775 * XXX These PURGEIF calls are redundant with the 776 * purge-all-families calls below, but are left in for 777 * now both to make a smaller change, and to avoid 778 * unplanned interactions with clearing of 779 * ifp->if_addrlist. 780 */ 781 purged = 0; 782 for (pr = dp->dom_protosw; 783 pr < dp->dom_protoswNPROTOSW; pr++) { 784 so.so_proto = pr; 785 if (pr->pr_usrreqs) { 786 (void) (*pr->pr_usrreqs->pr_generic)(&so, 787 PRU_PURGEIF, NULL, NULL, 788 (struct mbuf *) ifp, curlwp); 789 purged = 1; 790 } 791 } 792 if (purged == 0) { 793 /* 794 * XXX What's really the best thing to do 795 * XXX here? --thorpej (at) NetBSD.org 796 */ 797 printf("if_detach: WARNING: AF %d not purged\n", 798 family); 799 ifa_remove(ifp, ifa); 800 } 801 goto again; 802 } 803 804 if_free_sadl(ifp); 805 806 /* Walk the routing table looking for stragglers. */ 807 for (i = 0; i <= AF_MAX; i++) { 808 while (rt_walktree(i, if_rt_walktree, ifp) == ERESTART) 809 continue; 810 } 811 812 DOMAIN_FOREACH(dp) { 813 if (dp->dom_ifdetach != NULL && ifp->if_afdata[dp->dom_family]) 814 { 815 void *p = ifp->if_afdata[dp->dom_family]; 816 if (p) { 817 ifp->if_afdata[dp->dom_family] = NULL; 818 (*dp->dom_ifdetach)(ifp, p); 819 } 820 } 821 822 /* 823 * One would expect multicast memberships (INET and 824 * INET6) on UDP sockets to be purged by the PURGEIF 825 * calls above, but if all addresses were removed from 826 * the interface prior to destruction, the calls will 827 * not be made (e.g. ppp, for which pppd(8) generally 828 * removes addresses before destroying the interface). 829 * Because there is no invariant that multicast 830 * memberships only exist for interfaces with IPv4 831 * addresses, we must call PURGEIF regardless of 832 * addresses. (Protocols which might store ifnet 833 * pointers are marked with PR_PURGEIF.) 834 */ 835 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 836 so.so_proto = pr; 837 if (pr->pr_usrreqs && pr->pr_flags & PR_PURGEIF) 838 (void)(*pr->pr_usrreqs->pr_generic)(&so, 839 PRU_PURGEIF, NULL, NULL, 840 (struct mbuf *)ifp, curlwp); 841 } 842 } 843 844 (void)pfil_run_hooks(if_pfil, 845 (struct mbuf **)PFIL_IFNET_DETACH, ifp, PFIL_IFNET); 846 (void)pfil_head_destroy(ifp->if_pfil); 847 848 /* Announce that the interface is gone. */ 849 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 850 851 ifindex2ifnet[ifp->if_index] = NULL; 852 853 TAILQ_REMOVE(&ifnet_list, ifp, if_list); 854 855 ifioctl_detach(ifp); 856 857 /* 858 * remove packets that came from ifp, from software interrupt queues. 859 */ 860 DOMAIN_FOREACH(dp) { 861 for (i = 0; i < __arraycount(dp->dom_ifqueues); i++) { 862 struct ifqueue *iq = dp->dom_ifqueues[i]; 863 if (iq == NULL) 864 break; 865 dp->dom_ifqueues[i] = NULL; 866 if_detach_queues(ifp, iq); 867 } 868 } 869 870 /* 871 * IP queues have to be processed separately: net-queue barrier 872 * ensures that the packets are dequeued while a cross-call will 873 * ensure that the interrupts have completed. FIXME: not quite.. 874 */ 875 #ifdef INET 876 pktq_barrier(ip_pktq); 877 #endif 878 #ifdef INET6 879 pktq_barrier(ip6_pktq); 880 #endif 881 xc = xc_broadcast(0, (xcfunc_t)nullop, NULL, NULL); 882 xc_wait(xc); 883 884 splx(s); 885 } 886 887 static void 888 if_detach_queues(struct ifnet *ifp, struct ifqueue *q) 889 { 890 struct mbuf *m, *prev, *next; 891 892 prev = NULL; 893 for (m = q->ifq_head; m != NULL; m = next) { 894 KASSERT((m->m_flags & M_PKTHDR) != 0); 895 896 next = m->m_nextpkt; 897 if (m->m_pkthdr.rcvif != ifp) { 898 prev = m; 899 continue; 900 } 901 902 if (prev != NULL) 903 prev->m_nextpkt = m->m_nextpkt; 904 else 905 q->ifq_head = m->m_nextpkt; 906 if (q->ifq_tail == m) 907 q->ifq_tail = prev; 908 q->ifq_len--; 909 910 m->m_nextpkt = NULL; 911 m_freem(m); 912 IF_DROP(q); 913 } 914 } 915 916 /* 917 * Callback for a radix tree walk to delete all references to an 918 * ifnet. 919 */ 920 static int 921 if_rt_walktree(struct rtentry *rt, void *v) 922 { 923 struct ifnet *ifp = (struct ifnet *)v; 924 int error; 925 926 if (rt->rt_ifp != ifp) 927 return 0; 928 929 /* Delete the entry. */ 930 ++rt->rt_refcnt; 931 error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway, 932 rt_mask(rt), rt->rt_flags, NULL); 933 KASSERT((rt->rt_flags & RTF_UP) == 0); 934 rt->rt_ifp = NULL; 935 rtfree(rt); 936 if (error != 0) 937 printf("%s: warning: unable to delete rtentry @ %p, " 938 "error = %d\n", ifp->if_xname, rt, error); 939 return ERESTART; 940 } 941 942 /* 943 * Create a clone network interface. 944 */ 945 int 946 if_clone_create(const char *name) 947 { 948 struct if_clone *ifc; 949 int unit; 950 951 ifc = if_clone_lookup(name, &unit); 952 if (ifc == NULL) 953 return EINVAL; 954 955 if (ifunit(name) != NULL) 956 return EEXIST; 957 958 return (*ifc->ifc_create)(ifc, unit); 959 } 960 961 /* 962 * Destroy a clone network interface. 963 */ 964 int 965 if_clone_destroy(const char *name) 966 { 967 struct if_clone *ifc; 968 struct ifnet *ifp; 969 970 ifc = if_clone_lookup(name, NULL); 971 if (ifc == NULL) 972 return EINVAL; 973 974 ifp = ifunit(name); 975 if (ifp == NULL) 976 return ENXIO; 977 978 if (ifc->ifc_destroy == NULL) 979 return EOPNOTSUPP; 980 981 return (*ifc->ifc_destroy)(ifp); 982 } 983 984 /* 985 * Look up a network interface cloner. 986 */ 987 static struct if_clone * 988 if_clone_lookup(const char *name, int *unitp) 989 { 990 struct if_clone *ifc; 991 const char *cp; 992 char *dp, ifname[IFNAMSIZ + 3]; 993 int unit; 994 995 strcpy(ifname, "if_"); 996 /* separate interface name from unit */ 997 for (dp = ifname + 3, cp = name; cp - name < IFNAMSIZ && 998 *cp && (*cp < '0' || *cp > '9');) 999 *dp++ = *cp++; 1000 1001 if (cp == name || cp - name == IFNAMSIZ || !*cp) 1002 return NULL; /* No name or unit number */ 1003 *dp++ = '\0'; 1004 1005 again: 1006 LIST_FOREACH(ifc, &if_cloners, ifc_list) { 1007 if (strcmp(ifname + 3, ifc->ifc_name) == 0) 1008 break; 1009 } 1010 1011 if (ifc == NULL) { 1012 if (*ifname == '\0' || 1013 module_autoload(ifname, MODULE_CLASS_DRIVER)) 1014 return NULL; 1015 *ifname = '\0'; 1016 goto again; 1017 } 1018 1019 unit = 0; 1020 while (cp - name < IFNAMSIZ && *cp) { 1021 if (*cp < '0' || *cp > '9' || unit >= INT_MAX / 10) { 1022 /* Bogus unit number. */ 1023 return NULL; 1024 } 1025 unit = (unit * 10) + (*cp++ - '0'); 1026 } 1027 1028 if (unitp != NULL) 1029 *unitp = unit; 1030 return ifc; 1031 } 1032 1033 /* 1034 * Register a network interface cloner. 1035 */ 1036 void 1037 if_clone_attach(struct if_clone *ifc) 1038 { 1039 1040 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 1041 if_cloners_count++; 1042 } 1043 1044 /* 1045 * Unregister a network interface cloner. 1046 */ 1047 void 1048 if_clone_detach(struct if_clone *ifc) 1049 { 1050 1051 LIST_REMOVE(ifc, ifc_list); 1052 if_cloners_count--; 1053 } 1054 1055 /* 1056 * Provide list of interface cloners to userspace. 1057 */ 1058 static int 1059 if_clone_list(struct if_clonereq *ifcr) 1060 { 1061 char outbuf[IFNAMSIZ], *dst; 1062 struct if_clone *ifc; 1063 int count, error = 0; 1064 1065 ifcr->ifcr_total = if_cloners_count; 1066 if ((dst = ifcr->ifcr_buffer) == NULL) { 1067 /* Just asking how many there are. */ 1068 return 0; 1069 } 1070 1071 if (ifcr->ifcr_count < 0) 1072 return EINVAL; 1073 1074 count = (if_cloners_count < ifcr->ifcr_count) ? 1075 if_cloners_count : ifcr->ifcr_count; 1076 1077 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 1078 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 1079 (void)strncpy(outbuf, ifc->ifc_name, sizeof(outbuf)); 1080 if (outbuf[sizeof(outbuf) - 1] != '\0') 1081 return ENAMETOOLONG; 1082 error = copyout(outbuf, dst, sizeof(outbuf)); 1083 if (error != 0) 1084 break; 1085 } 1086 1087 return error; 1088 } 1089 1090 void 1091 ifa_insert(struct ifnet *ifp, struct ifaddr *ifa) 1092 { 1093 ifa->ifa_ifp = ifp; 1094 TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list); 1095 IFAREF(ifa); 1096 } 1097 1098 void 1099 ifa_remove(struct ifnet *ifp, struct ifaddr *ifa) 1100 { 1101 KASSERT(ifa->ifa_ifp == ifp); 1102 TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list); 1103 IFAFREE(ifa); 1104 } 1105 1106 static inline int 1107 equal(const struct sockaddr *sa1, const struct sockaddr *sa2) 1108 { 1109 return sockaddr_cmp(sa1, sa2) == 0; 1110 } 1111 1112 /* 1113 * Locate an interface based on a complete address. 1114 */ 1115 /*ARGSUSED*/ 1116 struct ifaddr * 1117 ifa_ifwithaddr(const struct sockaddr *addr) 1118 { 1119 struct ifnet *ifp; 1120 struct ifaddr *ifa; 1121 1122 IFNET_FOREACH(ifp) { 1123 if (ifp->if_output == if_nulloutput) 1124 continue; 1125 IFADDR_FOREACH(ifa, ifp) { 1126 if (ifa->ifa_addr->sa_family != addr->sa_family) 1127 continue; 1128 if (equal(addr, ifa->ifa_addr)) 1129 return ifa; 1130 if ((ifp->if_flags & IFF_BROADCAST) && 1131 ifa->ifa_broadaddr && 1132 /* IP6 doesn't have broadcast */ 1133 ifa->ifa_broadaddr->sa_len != 0 && 1134 equal(ifa->ifa_broadaddr, addr)) 1135 return ifa; 1136 } 1137 } 1138 return NULL; 1139 } 1140 1141 /* 1142 * Locate the point to point interface with a given destination address. 1143 */ 1144 /*ARGSUSED*/ 1145 struct ifaddr * 1146 ifa_ifwithdstaddr(const struct sockaddr *addr) 1147 { 1148 struct ifnet *ifp; 1149 struct ifaddr *ifa; 1150 1151 IFNET_FOREACH(ifp) { 1152 if (ifp->if_output == if_nulloutput) 1153 continue; 1154 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1155 continue; 1156 IFADDR_FOREACH(ifa, ifp) { 1157 if (ifa->ifa_addr->sa_family != addr->sa_family || 1158 ifa->ifa_dstaddr == NULL) 1159 continue; 1160 if (equal(addr, ifa->ifa_dstaddr)) 1161 return ifa; 1162 } 1163 } 1164 return NULL; 1165 } 1166 1167 /* 1168 * Find an interface on a specific network. If many, choice 1169 * is most specific found. 1170 */ 1171 struct ifaddr * 1172 ifa_ifwithnet(const struct sockaddr *addr) 1173 { 1174 struct ifnet *ifp; 1175 struct ifaddr *ifa; 1176 const struct sockaddr_dl *sdl; 1177 struct ifaddr *ifa_maybe = 0; 1178 u_int af = addr->sa_family; 1179 const char *addr_data = addr->sa_data, *cplim; 1180 1181 if (af == AF_LINK) { 1182 sdl = satocsdl(addr); 1183 if (sdl->sdl_index && sdl->sdl_index < if_indexlim && 1184 ifindex2ifnet[sdl->sdl_index] && 1185 ifindex2ifnet[sdl->sdl_index]->if_output != if_nulloutput) 1186 return ifnet_addrs[sdl->sdl_index]; 1187 } 1188 #ifdef NETATALK 1189 if (af == AF_APPLETALK) { 1190 const struct sockaddr_at *sat, *sat2; 1191 sat = (const struct sockaddr_at *)addr; 1192 IFNET_FOREACH(ifp) { 1193 if (ifp->if_output == if_nulloutput) 1194 continue; 1195 ifa = at_ifawithnet((const struct sockaddr_at *)addr, ifp); 1196 if (ifa == NULL) 1197 continue; 1198 sat2 = (struct sockaddr_at *)ifa->ifa_addr; 1199 if (sat2->sat_addr.s_net == sat->sat_addr.s_net) 1200 return ifa; /* exact match */ 1201 if (ifa_maybe == NULL) { 1202 /* else keep the if with the right range */ 1203 ifa_maybe = ifa; 1204 } 1205 } 1206 return ifa_maybe; 1207 } 1208 #endif 1209 IFNET_FOREACH(ifp) { 1210 if (ifp->if_output == if_nulloutput) 1211 continue; 1212 IFADDR_FOREACH(ifa, ifp) { 1213 const char *cp, *cp2, *cp3; 1214 1215 if (ifa->ifa_addr->sa_family != af || 1216 ifa->ifa_netmask == NULL) 1217 next: continue; 1218 cp = addr_data; 1219 cp2 = ifa->ifa_addr->sa_data; 1220 cp3 = ifa->ifa_netmask->sa_data; 1221 cplim = (const char *)ifa->ifa_netmask + 1222 ifa->ifa_netmask->sa_len; 1223 while (cp3 < cplim) { 1224 if ((*cp++ ^ *cp2++) & *cp3++) { 1225 /* want to continue for() loop */ 1226 goto next; 1227 } 1228 } 1229 if (ifa_maybe == NULL || 1230 rn_refines((void *)ifa->ifa_netmask, 1231 (void *)ifa_maybe->ifa_netmask)) 1232 ifa_maybe = ifa; 1233 } 1234 } 1235 return ifa_maybe; 1236 } 1237 1238 /* 1239 * Find the interface of the addresss. 1240 */ 1241 struct ifaddr * 1242 ifa_ifwithladdr(const struct sockaddr *addr) 1243 { 1244 struct ifaddr *ia; 1245 1246 if ((ia = ifa_ifwithaddr(addr)) || (ia = ifa_ifwithdstaddr(addr)) || 1247 (ia = ifa_ifwithnet(addr))) 1248 return ia; 1249 return NULL; 1250 } 1251 1252 /* 1253 * Find an interface using a specific address family 1254 */ 1255 struct ifaddr * 1256 ifa_ifwithaf(int af) 1257 { 1258 struct ifnet *ifp; 1259 struct ifaddr *ifa; 1260 1261 IFNET_FOREACH(ifp) { 1262 if (ifp->if_output == if_nulloutput) 1263 continue; 1264 IFADDR_FOREACH(ifa, ifp) { 1265 if (ifa->ifa_addr->sa_family == af) 1266 return ifa; 1267 } 1268 } 1269 return NULL; 1270 } 1271 1272 /* 1273 * Find an interface address specific to an interface best matching 1274 * a given address. 1275 */ 1276 struct ifaddr * 1277 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 1278 { 1279 struct ifaddr *ifa; 1280 const char *cp, *cp2, *cp3; 1281 const char *cplim; 1282 struct ifaddr *ifa_maybe = 0; 1283 u_int af = addr->sa_family; 1284 1285 if (ifp->if_output == if_nulloutput) 1286 return NULL; 1287 1288 if (af >= AF_MAX) 1289 return NULL; 1290 1291 IFADDR_FOREACH(ifa, ifp) { 1292 if (ifa->ifa_addr->sa_family != af) 1293 continue; 1294 ifa_maybe = ifa; 1295 if (ifa->ifa_netmask == NULL) { 1296 if (equal(addr, ifa->ifa_addr) || 1297 (ifa->ifa_dstaddr && 1298 equal(addr, ifa->ifa_dstaddr))) 1299 return ifa; 1300 continue; 1301 } 1302 cp = addr->sa_data; 1303 cp2 = ifa->ifa_addr->sa_data; 1304 cp3 = ifa->ifa_netmask->sa_data; 1305 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1306 for (; cp3 < cplim; cp3++) { 1307 if ((*cp++ ^ *cp2++) & *cp3) 1308 break; 1309 } 1310 if (cp3 == cplim) 1311 return ifa; 1312 } 1313 return ifa_maybe; 1314 } 1315 1316 /* 1317 * Default action when installing a route with a Link Level gateway. 1318 * Lookup an appropriate real ifa to point to. 1319 * This should be moved to /sys/net/link.c eventually. 1320 */ 1321 void 1322 link_rtrequest(int cmd, struct rtentry *rt, const struct rt_addrinfo *info) 1323 { 1324 struct ifaddr *ifa; 1325 const struct sockaddr *dst; 1326 struct ifnet *ifp; 1327 1328 if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL || 1329 (ifp = ifa->ifa_ifp) == NULL || (dst = rt_getkey(rt)) == NULL) 1330 return; 1331 if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) { 1332 rt_replace_ifa(rt, ifa); 1333 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1334 ifa->ifa_rtrequest(cmd, rt, info); 1335 } 1336 } 1337 1338 /* 1339 * Handle a change in the interface link state. 1340 * XXX: We should listen to the routing socket in-kernel rather 1341 * than calling in6_if_link_* functions directly from here. 1342 */ 1343 void 1344 if_link_state_change(struct ifnet *ifp, int link_state) 1345 { 1346 int s; 1347 #if defined(DEBUG) || defined(INET6) 1348 int old_link_state; 1349 #endif 1350 1351 s = splnet(); 1352 if (ifp->if_link_state == link_state) { 1353 splx(s); 1354 return; 1355 } 1356 1357 #if defined(DEBUG) || defined(INET6) 1358 old_link_state = ifp->if_link_state; 1359 #endif 1360 ifp->if_link_state = link_state; 1361 #ifdef DEBUG 1362 log(LOG_DEBUG, "%s: link state %s (was %s)\n", ifp->if_xname, 1363 link_state == LINK_STATE_UP ? "UP" : 1364 link_state == LINK_STATE_DOWN ? "DOWN" : 1365 "UNKNOWN", 1366 old_link_state == LINK_STATE_UP ? "UP" : 1367 old_link_state == LINK_STATE_DOWN ? "DOWN" : 1368 "UNKNOWN"); 1369 #endif 1370 1371 #ifdef INET6 1372 /* 1373 * When going from UNKNOWN to UP, we need to mark existing 1374 * IPv6 addresses as tentative and restart DAD as we may have 1375 * erroneously not found a duplicate. 1376 * 1377 * This needs to happen before rt_ifmsg to avoid a race where 1378 * listeners would have an address and expect it to work right 1379 * away. 1380 */ 1381 if (in6_present && link_state == LINK_STATE_UP && 1382 old_link_state == LINK_STATE_UNKNOWN) 1383 in6_if_link_down(ifp); 1384 #endif 1385 1386 /* Notify that the link state has changed. */ 1387 rt_ifmsg(ifp); 1388 1389 #if NCARP > 0 1390 if (ifp->if_carp) 1391 carp_carpdev_state(ifp); 1392 #endif 1393 1394 #ifdef INET6 1395 if (in6_present) { 1396 if (link_state == LINK_STATE_DOWN) 1397 in6_if_link_down(ifp); 1398 else if (link_state == LINK_STATE_UP) 1399 in6_if_link_up(ifp); 1400 } 1401 #endif 1402 1403 splx(s); 1404 } 1405 1406 /* 1407 * Mark an interface down and notify protocols of 1408 * the transition. 1409 * NOTE: must be called at splsoftnet or equivalent. 1410 */ 1411 void 1412 if_down(struct ifnet *ifp) 1413 { 1414 struct ifaddr *ifa; 1415 1416 ifp->if_flags &= ~IFF_UP; 1417 nanotime(&ifp->if_lastchange); 1418 IFADDR_FOREACH(ifa, ifp) 1419 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1420 IFQ_PURGE(&ifp->if_snd); 1421 #if NCARP > 0 1422 if (ifp->if_carp) 1423 carp_carpdev_state(ifp); 1424 #endif 1425 rt_ifmsg(ifp); 1426 #ifdef INET6 1427 if (in6_present) 1428 in6_if_down(ifp); 1429 #endif 1430 } 1431 1432 /* 1433 * Mark an interface up and notify protocols of 1434 * the transition. 1435 * NOTE: must be called at splsoftnet or equivalent. 1436 */ 1437 void 1438 if_up(struct ifnet *ifp) 1439 { 1440 #ifdef notyet 1441 struct ifaddr *ifa; 1442 #endif 1443 1444 ifp->if_flags |= IFF_UP; 1445 nanotime(&ifp->if_lastchange); 1446 #ifdef notyet 1447 /* this has no effect on IP, and will kill all ISO connections XXX */ 1448 IFADDR_FOREACH(ifa, ifp) 1449 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1450 #endif 1451 #if NCARP > 0 1452 if (ifp->if_carp) 1453 carp_carpdev_state(ifp); 1454 #endif 1455 rt_ifmsg(ifp); 1456 #ifdef INET6 1457 if (in6_present) 1458 in6_if_up(ifp); 1459 #endif 1460 } 1461 1462 /* 1463 * Handle interface watchdog timer routines. Called 1464 * from softclock, we decrement timers (if set) and 1465 * call the appropriate interface routine on expiration. 1466 */ 1467 void 1468 if_slowtimo(void *arg) 1469 { 1470 struct ifnet *ifp; 1471 int s = splnet(); 1472 1473 IFNET_FOREACH(ifp) { 1474 if (ifp->if_timer == 0 || --ifp->if_timer) 1475 continue; 1476 if (ifp->if_watchdog != NULL) 1477 (*ifp->if_watchdog)(ifp); 1478 } 1479 splx(s); 1480 callout_reset(&if_slowtimo_ch, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 1481 } 1482 1483 /* 1484 * Set/clear promiscuous mode on interface ifp based on the truth value 1485 * of pswitch. The calls are reference counted so that only the first 1486 * "on" request actually has an effect, as does the final "off" request. 1487 * Results are undefined if the "off" and "on" requests are not matched. 1488 */ 1489 int 1490 ifpromisc(struct ifnet *ifp, int pswitch) 1491 { 1492 int pcount, ret; 1493 short nflags; 1494 1495 pcount = ifp->if_pcount; 1496 if (pswitch) { 1497 /* 1498 * Allow the device to be "placed" into promiscuous 1499 * mode even if it is not configured up. It will 1500 * consult IFF_PROMISC when it is brought up. 1501 */ 1502 if (ifp->if_pcount++ != 0) 1503 return 0; 1504 nflags = ifp->if_flags | IFF_PROMISC; 1505 } else { 1506 if (--ifp->if_pcount > 0) 1507 return 0; 1508 nflags = ifp->if_flags & ~IFF_PROMISC; 1509 } 1510 ret = if_flags_set(ifp, nflags); 1511 /* Restore interface state if not successful. */ 1512 if (ret != 0) { 1513 ifp->if_pcount = pcount; 1514 } 1515 return ret; 1516 } 1517 1518 /* 1519 * Map interface name to 1520 * interface structure pointer. 1521 */ 1522 struct ifnet * 1523 ifunit(const char *name) 1524 { 1525 struct ifnet *ifp; 1526 const char *cp = name; 1527 u_int unit = 0; 1528 u_int i; 1529 1530 /* 1531 * If the entire name is a number, treat it as an ifindex. 1532 */ 1533 for (i = 0; i < IFNAMSIZ && *cp >= '0' && *cp <= '9'; i++, cp++) { 1534 unit = unit * 10 + (*cp - '0'); 1535 } 1536 1537 /* 1538 * If the number took all of the name, then it's a valid ifindex. 1539 */ 1540 if (i == IFNAMSIZ || (cp != name && *cp == '\0')) { 1541 if (unit >= if_indexlim) 1542 return NULL; 1543 ifp = ifindex2ifnet[unit]; 1544 if (ifp == NULL || ifp->if_output == if_nulloutput) 1545 return NULL; 1546 return ifp; 1547 } 1548 1549 IFNET_FOREACH(ifp) { 1550 if (ifp->if_output == if_nulloutput) 1551 continue; 1552 if (strcmp(ifp->if_xname, name) == 0) 1553 return ifp; 1554 } 1555 return NULL; 1556 } 1557 1558 ifnet_t * 1559 if_byindex(u_int idx) 1560 { 1561 return (idx < if_indexlim) ? ifindex2ifnet[idx] : NULL; 1562 } 1563 1564 /* common */ 1565 int 1566 ifioctl_common(struct ifnet *ifp, u_long cmd, void *data) 1567 { 1568 int s; 1569 struct ifreq *ifr; 1570 struct ifcapreq *ifcr; 1571 struct ifdatareq *ifdr; 1572 1573 switch (cmd) { 1574 case SIOCSIFCAP: 1575 ifcr = data; 1576 if ((ifcr->ifcr_capenable & ~ifp->if_capabilities) != 0) 1577 return EINVAL; 1578 1579 if (ifcr->ifcr_capenable == ifp->if_capenable) 1580 return 0; 1581 1582 ifp->if_capenable = ifcr->ifcr_capenable; 1583 1584 /* Pre-compute the checksum flags mask. */ 1585 ifp->if_csum_flags_tx = 0; 1586 ifp->if_csum_flags_rx = 0; 1587 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Tx) { 1588 ifp->if_csum_flags_tx |= M_CSUM_IPv4; 1589 } 1590 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Rx) { 1591 ifp->if_csum_flags_rx |= M_CSUM_IPv4; 1592 } 1593 1594 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Tx) { 1595 ifp->if_csum_flags_tx |= M_CSUM_TCPv4; 1596 } 1597 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Rx) { 1598 ifp->if_csum_flags_rx |= M_CSUM_TCPv4; 1599 } 1600 1601 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Tx) { 1602 ifp->if_csum_flags_tx |= M_CSUM_UDPv4; 1603 } 1604 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Rx) { 1605 ifp->if_csum_flags_rx |= M_CSUM_UDPv4; 1606 } 1607 1608 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Tx) { 1609 ifp->if_csum_flags_tx |= M_CSUM_TCPv6; 1610 } 1611 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Rx) { 1612 ifp->if_csum_flags_rx |= M_CSUM_TCPv6; 1613 } 1614 1615 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Tx) { 1616 ifp->if_csum_flags_tx |= M_CSUM_UDPv6; 1617 } 1618 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Rx) { 1619 ifp->if_csum_flags_rx |= M_CSUM_UDPv6; 1620 } 1621 if (ifp->if_flags & IFF_UP) 1622 return ENETRESET; 1623 return 0; 1624 case SIOCSIFFLAGS: 1625 ifr = data; 1626 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 1627 s = splnet(); 1628 if_down(ifp); 1629 splx(s); 1630 } 1631 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { 1632 s = splnet(); 1633 if_up(ifp); 1634 splx(s); 1635 } 1636 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1637 (ifr->ifr_flags &~ IFF_CANTCHANGE); 1638 break; 1639 case SIOCGIFFLAGS: 1640 ifr = data; 1641 ifr->ifr_flags = ifp->if_flags; 1642 break; 1643 1644 case SIOCGIFMETRIC: 1645 ifr = data; 1646 ifr->ifr_metric = ifp->if_metric; 1647 break; 1648 1649 case SIOCGIFMTU: 1650 ifr = data; 1651 ifr->ifr_mtu = ifp->if_mtu; 1652 break; 1653 1654 case SIOCGIFDLT: 1655 ifr = data; 1656 ifr->ifr_dlt = ifp->if_dlt; 1657 break; 1658 1659 case SIOCGIFCAP: 1660 ifcr = data; 1661 ifcr->ifcr_capabilities = ifp->if_capabilities; 1662 ifcr->ifcr_capenable = ifp->if_capenable; 1663 break; 1664 1665 case SIOCSIFMETRIC: 1666 ifr = data; 1667 ifp->if_metric = ifr->ifr_metric; 1668 break; 1669 1670 case SIOCGIFDATA: 1671 ifdr = data; 1672 ifdr->ifdr_data = ifp->if_data; 1673 break; 1674 1675 case SIOCGIFINDEX: 1676 ifr = data; 1677 ifr->ifr_index = ifp->if_index; 1678 break; 1679 1680 case SIOCZIFDATA: 1681 ifdr = data; 1682 ifdr->ifdr_data = ifp->if_data; 1683 /* 1684 * Assumes that the volatile counters that can be 1685 * zero'ed are at the end of if_data. 1686 */ 1687 memset(&ifp->if_data.ifi_ipackets, 0, sizeof(ifp->if_data) - 1688 offsetof(struct if_data, ifi_ipackets)); 1689 /* 1690 * The memset() clears to the bottm of if_data. In the area, 1691 * if_lastchange is included. Please be careful if new entry 1692 * will be added into if_data or rewite this. 1693 * 1694 * And also, update if_lastchnage. 1695 */ 1696 getnanotime(&ifp->if_lastchange); 1697 break; 1698 case SIOCSIFMTU: 1699 ifr = data; 1700 if (ifp->if_mtu == ifr->ifr_mtu) 1701 break; 1702 ifp->if_mtu = ifr->ifr_mtu; 1703 /* 1704 * If the link MTU changed, do network layer specific procedure. 1705 */ 1706 #ifdef INET6 1707 if (in6_present) 1708 nd6_setmtu(ifp); 1709 #endif 1710 return ENETRESET; 1711 default: 1712 return ENOTTY; 1713 } 1714 return 0; 1715 } 1716 1717 int 1718 ifaddrpref_ioctl(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 1719 { 1720 struct if_addrprefreq *ifap = (struct if_addrprefreq *)data; 1721 struct ifaddr *ifa; 1722 const struct sockaddr *any, *sa; 1723 union { 1724 struct sockaddr sa; 1725 struct sockaddr_storage ss; 1726 } u, v; 1727 1728 switch (cmd) { 1729 case SIOCSIFADDRPREF: 1730 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_INTERFACE, 1731 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1732 NULL) != 0) 1733 return EPERM; 1734 case SIOCGIFADDRPREF: 1735 break; 1736 default: 1737 return EOPNOTSUPP; 1738 } 1739 1740 /* sanity checks */ 1741 if (data == NULL || ifp == NULL) { 1742 panic("invalid argument to %s", __func__); 1743 /*NOTREACHED*/ 1744 } 1745 1746 /* address must be specified on ADD and DELETE */ 1747 sa = sstocsa(&ifap->ifap_addr); 1748 if (sa->sa_family != sofamily(so)) 1749 return EINVAL; 1750 if ((any = sockaddr_any(sa)) == NULL || sa->sa_len != any->sa_len) 1751 return EINVAL; 1752 1753 sockaddr_externalize(&v.sa, sizeof(v.ss), sa); 1754 1755 IFADDR_FOREACH(ifa, ifp) { 1756 if (ifa->ifa_addr->sa_family != sa->sa_family) 1757 continue; 1758 sockaddr_externalize(&u.sa, sizeof(u.ss), ifa->ifa_addr); 1759 if (sockaddr_cmp(&u.sa, &v.sa) == 0) 1760 break; 1761 } 1762 if (ifa == NULL) 1763 return EADDRNOTAVAIL; 1764 1765 switch (cmd) { 1766 case SIOCSIFADDRPREF: 1767 ifa->ifa_preference = ifap->ifap_preference; 1768 return 0; 1769 case SIOCGIFADDRPREF: 1770 /* fill in the if_laddrreq structure */ 1771 (void)sockaddr_copy(sstosa(&ifap->ifap_addr), 1772 sizeof(ifap->ifap_addr), ifa->ifa_addr); 1773 ifap->ifap_preference = ifa->ifa_preference; 1774 return 0; 1775 default: 1776 return EOPNOTSUPP; 1777 } 1778 } 1779 1780 static void 1781 ifnet_lock_enter(struct ifnet_lock *il) 1782 { 1783 uint64_t *nenter; 1784 1785 /* Before trying to acquire the mutex, increase the count of threads 1786 * who have entered or who wait to enter the critical section. 1787 * Avoid one costly locked memory transaction by keeping a count for 1788 * each CPU. 1789 */ 1790 nenter = percpu_getref(il->il_nenter); 1791 (*nenter)++; 1792 percpu_putref(il->il_nenter); 1793 mutex_enter(&il->il_lock); 1794 } 1795 1796 static void 1797 ifnet_lock_exit(struct ifnet_lock *il) 1798 { 1799 /* Increase the count of threads who have exited the critical 1800 * section. Increase while we still hold the lock. 1801 */ 1802 il->il_nexit++; 1803 mutex_exit(&il->il_lock); 1804 } 1805 1806 /* 1807 * Interface ioctls. 1808 */ 1809 static int 1810 doifioctl(struct socket *so, u_long cmd, void *data, struct lwp *l) 1811 { 1812 struct ifnet *ifp; 1813 struct ifreq *ifr; 1814 int error = 0; 1815 #if defined(COMPAT_OSOCK) || defined(COMPAT_OIFREQ) 1816 u_long ocmd = cmd; 1817 #endif 1818 short oif_flags; 1819 #ifdef COMPAT_OIFREQ 1820 struct ifreq ifrb; 1821 struct oifreq *oifr = NULL; 1822 #endif 1823 1824 switch (cmd) { 1825 #ifdef COMPAT_OIFREQ 1826 case OSIOCGIFCONF: 1827 case OOSIOCGIFCONF: 1828 return compat_ifconf(cmd, data); 1829 #endif 1830 #ifdef COMPAT_OIFDATA 1831 case OSIOCGIFDATA: 1832 case OSIOCZIFDATA: 1833 return compat_ifdatareq(l, cmd, data); 1834 #endif 1835 case SIOCGIFCONF: 1836 return ifconf(cmd, data); 1837 case SIOCINITIFADDR: 1838 return EPERM; 1839 } 1840 1841 #ifdef COMPAT_OIFREQ 1842 cmd = compat_cvtcmd(cmd); 1843 if (cmd != ocmd) { 1844 oifr = data; 1845 data = ifr = &ifrb; 1846 ifreqo2n(oifr, ifr); 1847 } else 1848 #endif 1849 ifr = data; 1850 1851 ifp = ifunit(ifr->ifr_name); 1852 1853 switch (cmd) { 1854 case SIOCIFCREATE: 1855 case SIOCIFDESTROY: 1856 if (l != NULL) { 1857 error = kauth_authorize_network(l->l_cred, 1858 KAUTH_NETWORK_INTERFACE, 1859 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1860 (void *)cmd, NULL); 1861 if (error != 0) 1862 return error; 1863 } 1864 return (cmd == SIOCIFCREATE) ? 1865 if_clone_create(ifr->ifr_name) : 1866 if_clone_destroy(ifr->ifr_name); 1867 1868 case SIOCIFGCLONERS: 1869 return if_clone_list((struct if_clonereq *)data); 1870 } 1871 1872 if (ifp == NULL) 1873 return ENXIO; 1874 1875 switch (cmd) { 1876 case SIOCALIFADDR: 1877 case SIOCDLIFADDR: 1878 case SIOCSIFADDRPREF: 1879 case SIOCSIFFLAGS: 1880 case SIOCSIFCAP: 1881 case SIOCSIFMETRIC: 1882 case SIOCZIFDATA: 1883 case SIOCSIFMTU: 1884 case SIOCSIFPHYADDR: 1885 case SIOCDIFPHYADDR: 1886 #ifdef INET6 1887 case SIOCSIFPHYADDR_IN6: 1888 #endif 1889 case SIOCSLIFPHYADDR: 1890 case SIOCADDMULTI: 1891 case SIOCDELMULTI: 1892 case SIOCSIFMEDIA: 1893 case SIOCSDRVSPEC: 1894 case SIOCG80211: 1895 case SIOCS80211: 1896 case SIOCS80211NWID: 1897 case SIOCS80211NWKEY: 1898 case SIOCS80211POWER: 1899 case SIOCS80211BSSID: 1900 case SIOCS80211CHANNEL: 1901 case SIOCSLINKSTR: 1902 if (l != NULL) { 1903 error = kauth_authorize_network(l->l_cred, 1904 KAUTH_NETWORK_INTERFACE, 1905 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1906 (void *)cmd, NULL); 1907 if (error != 0) 1908 return error; 1909 } 1910 } 1911 1912 oif_flags = ifp->if_flags; 1913 1914 ifnet_lock_enter(ifp->if_ioctl_lock); 1915 error = (*ifp->if_ioctl)(ifp, cmd, data); 1916 if (error != ENOTTY) 1917 ; 1918 else if (so->so_proto == NULL) 1919 error = EOPNOTSUPP; 1920 else { 1921 #ifdef COMPAT_OSOCK 1922 error = compat_ifioctl(so, ocmd, cmd, data, l); 1923 #else 1924 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so, 1925 cmd, data, ifp); 1926 #endif 1927 } 1928 1929 if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) { 1930 #ifdef INET6 1931 if (in6_present && (ifp->if_flags & IFF_UP) != 0) { 1932 int s = splnet(); 1933 in6_if_up(ifp); 1934 splx(s); 1935 } 1936 #endif 1937 } 1938 #ifdef COMPAT_OIFREQ 1939 if (cmd != ocmd) 1940 ifreqn2o(oifr, ifr); 1941 #endif 1942 1943 ifnet_lock_exit(ifp->if_ioctl_lock); 1944 return error; 1945 } 1946 1947 /* This callback adds to the sum in `arg' the number of 1948 * threads on `ci' who have entered or who wait to enter the 1949 * critical section. 1950 */ 1951 static void 1952 ifnet_lock_sum(void *p, void *arg, struct cpu_info *ci) 1953 { 1954 uint64_t *sum = arg, *nenter = p; 1955 1956 *sum += *nenter; 1957 } 1958 1959 /* Return the number of threads who have entered or who wait 1960 * to enter the critical section on all CPUs. 1961 */ 1962 static uint64_t 1963 ifnet_lock_entrances(struct ifnet_lock *il) 1964 { 1965 uint64_t sum = 0; 1966 1967 percpu_foreach(il->il_nenter, ifnet_lock_sum, &sum); 1968 1969 return sum; 1970 } 1971 1972 static int 1973 ifioctl_attach(struct ifnet *ifp) 1974 { 1975 struct ifnet_lock *il; 1976 1977 /* If the driver has not supplied its own if_ioctl, then 1978 * supply the default. 1979 */ 1980 if (ifp->if_ioctl == NULL) 1981 ifp->if_ioctl = ifioctl_common; 1982 1983 /* Create an ifnet_lock for synchronizing ifioctls. */ 1984 if ((il = kmem_zalloc(sizeof(*il), KM_SLEEP)) == NULL) 1985 return ENOMEM; 1986 1987 il->il_nenter = percpu_alloc(sizeof(uint64_t)); 1988 if (il->il_nenter == NULL) { 1989 kmem_free(il, sizeof(*il)); 1990 return ENOMEM; 1991 } 1992 1993 mutex_init(&il->il_lock, MUTEX_DEFAULT, IPL_NONE); 1994 cv_init(&il->il_emptied, ifp->if_xname); 1995 1996 ifp->if_ioctl_lock = il; 1997 1998 return 0; 1999 } 2000 2001 /* 2002 * This must not be called until after `ifp' has been withdrawn from the 2003 * ifnet tables so that ifioctl() cannot get a handle on it by calling 2004 * ifunit(). 2005 */ 2006 static void 2007 ifioctl_detach(struct ifnet *ifp) 2008 { 2009 struct ifnet_lock *il; 2010 2011 il = ifp->if_ioctl_lock; 2012 mutex_enter(&il->il_lock); 2013 /* Install if_nullioctl to make sure that any thread that 2014 * subsequently enters the critical section will quit it 2015 * immediately and signal the condition variable that we 2016 * wait on, below. 2017 */ 2018 ifp->if_ioctl = if_nullioctl; 2019 /* Sleep while threads are still in the critical section or 2020 * wait to enter it. 2021 */ 2022 while (ifnet_lock_entrances(il) != il->il_nexit) 2023 cv_wait(&il->il_emptied, &il->il_lock); 2024 /* At this point, we are the only thread still in the critical 2025 * section, and no new thread can get a handle on the ifioctl 2026 * lock, so it is safe to free its memory. 2027 */ 2028 mutex_exit(&il->il_lock); 2029 ifp->if_ioctl_lock = NULL; 2030 percpu_free(il->il_nenter, sizeof(uint64_t)); 2031 il->il_nenter = NULL; 2032 cv_destroy(&il->il_emptied); 2033 mutex_destroy(&il->il_lock); 2034 kmem_free(il, sizeof(*il)); 2035 } 2036 2037 /* 2038 * Return interface configuration 2039 * of system. List may be used 2040 * in later ioctl's (above) to get 2041 * other information. 2042 * 2043 * Each record is a struct ifreq. Before the addition of 2044 * sockaddr_storage, the API rule was that sockaddr flavors that did 2045 * not fit would extend beyond the struct ifreq, with the next struct 2046 * ifreq starting sa_len beyond the struct sockaddr. Because the 2047 * union in struct ifreq includes struct sockaddr_storage, every kind 2048 * of sockaddr must fit. Thus, there are no longer any overlength 2049 * records. 2050 * 2051 * Records are added to the user buffer if they fit, and ifc_len is 2052 * adjusted to the length that was written. Thus, the user is only 2053 * assured of getting the complete list if ifc_len on return is at 2054 * least sizeof(struct ifreq) less than it was on entry. 2055 * 2056 * If the user buffer pointer is NULL, this routine copies no data and 2057 * returns the amount of space that would be needed. 2058 * 2059 * Invariants: 2060 * ifrp points to the next part of the user's buffer to be used. If 2061 * ifrp != NULL, space holds the number of bytes remaining that we may 2062 * write at ifrp. Otherwise, space holds the number of bytes that 2063 * would have been written had there been adequate space. 2064 */ 2065 /*ARGSUSED*/ 2066 int 2067 ifconf(u_long cmd, void *data) 2068 { 2069 struct ifconf *ifc = (struct ifconf *)data; 2070 struct ifnet *ifp; 2071 struct ifaddr *ifa; 2072 struct ifreq ifr, *ifrp; 2073 int space, error = 0; 2074 const int sz = (int)sizeof(struct ifreq); 2075 2076 if ((ifrp = ifc->ifc_req) == NULL) 2077 space = 0; 2078 else 2079 space = ifc->ifc_len; 2080 IFNET_FOREACH(ifp) { 2081 (void)strncpy(ifr.ifr_name, ifp->if_xname, 2082 sizeof(ifr.ifr_name)); 2083 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') 2084 return ENAMETOOLONG; 2085 if (IFADDR_EMPTY(ifp)) { 2086 /* Interface with no addresses - send zero sockaddr. */ 2087 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr)); 2088 if (ifrp == NULL) { 2089 space += sz; 2090 continue; 2091 } 2092 if (space >= sz) { 2093 error = copyout(&ifr, ifrp, sz); 2094 if (error != 0) 2095 return error; 2096 ifrp++; 2097 space -= sz; 2098 } 2099 } 2100 2101 IFADDR_FOREACH(ifa, ifp) { 2102 struct sockaddr *sa = ifa->ifa_addr; 2103 /* all sockaddrs must fit in sockaddr_storage */ 2104 KASSERT(sa->sa_len <= sizeof(ifr.ifr_ifru)); 2105 2106 if (ifrp == NULL) { 2107 space += sz; 2108 continue; 2109 } 2110 memcpy(&ifr.ifr_space, sa, sa->sa_len); 2111 if (space >= sz) { 2112 error = copyout(&ifr, ifrp, sz); 2113 if (error != 0) 2114 return (error); 2115 ifrp++; space -= sz; 2116 } 2117 } 2118 } 2119 if (ifrp != NULL) { 2120 KASSERT(0 <= space && space <= ifc->ifc_len); 2121 ifc->ifc_len -= space; 2122 } else { 2123 KASSERT(space >= 0); 2124 ifc->ifc_len = space; 2125 } 2126 return (0); 2127 } 2128 2129 int 2130 ifreq_setaddr(u_long cmd, struct ifreq *ifr, const struct sockaddr *sa) 2131 { 2132 uint8_t len; 2133 #ifdef COMPAT_OIFREQ 2134 struct ifreq ifrb; 2135 struct oifreq *oifr = NULL; 2136 u_long ocmd = cmd; 2137 cmd = compat_cvtcmd(cmd); 2138 if (cmd != ocmd) { 2139 oifr = (struct oifreq *)(void *)ifr; 2140 ifr = &ifrb; 2141 ifreqo2n(oifr, ifr); 2142 len = sizeof(oifr->ifr_addr); 2143 } else 2144 #endif 2145 len = sizeof(ifr->ifr_ifru.ifru_space); 2146 2147 if (len < sa->sa_len) 2148 return EFBIG; 2149 2150 memset(&ifr->ifr_addr, 0, len); 2151 sockaddr_copy(&ifr->ifr_addr, len, sa); 2152 2153 #ifdef COMPAT_OIFREQ 2154 if (cmd != ocmd) 2155 ifreqn2o(oifr, ifr); 2156 #endif 2157 return 0; 2158 } 2159 2160 /* 2161 * Queue message on interface, and start output if interface 2162 * not yet active. 2163 */ 2164 int 2165 ifq_enqueue(struct ifnet *ifp, struct mbuf *m 2166 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 2167 { 2168 int len = m->m_pkthdr.len; 2169 int mflags = m->m_flags; 2170 int s = splnet(); 2171 int error; 2172 2173 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 2174 if (error != 0) 2175 goto out; 2176 ifp->if_obytes += len; 2177 if (mflags & M_MCAST) 2178 ifp->if_omcasts++; 2179 if ((ifp->if_flags & IFF_OACTIVE) == 0) 2180 (*ifp->if_start)(ifp); 2181 out: 2182 splx(s); 2183 return error; 2184 } 2185 2186 /* 2187 * Queue message on interface, possibly using a second fast queue 2188 */ 2189 int 2190 ifq_enqueue2(struct ifnet *ifp, struct ifqueue *ifq, struct mbuf *m 2191 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 2192 { 2193 int error = 0; 2194 2195 if (ifq != NULL 2196 #ifdef ALTQ 2197 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 2198 #endif 2199 ) { 2200 if (IF_QFULL(ifq)) { 2201 IF_DROP(&ifp->if_snd); 2202 m_freem(m); 2203 if (error == 0) 2204 error = ENOBUFS; 2205 } else 2206 IF_ENQUEUE(ifq, m); 2207 } else 2208 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 2209 if (error != 0) { 2210 ++ifp->if_oerrors; 2211 return error; 2212 } 2213 return 0; 2214 } 2215 2216 int 2217 if_addr_init(ifnet_t *ifp, struct ifaddr *ifa, const bool src) 2218 { 2219 int rc; 2220 2221 if (ifp->if_initaddr != NULL) 2222 rc = (*ifp->if_initaddr)(ifp, ifa, src); 2223 else if (src || 2224 (rc = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ifa)) == ENOTTY) 2225 rc = (*ifp->if_ioctl)(ifp, SIOCINITIFADDR, ifa); 2226 2227 return rc; 2228 } 2229 2230 int 2231 if_flags_set(ifnet_t *ifp, const short flags) 2232 { 2233 int rc; 2234 2235 if (ifp->if_setflags != NULL) 2236 rc = (*ifp->if_setflags)(ifp, flags); 2237 else { 2238 short cantflags, chgdflags; 2239 struct ifreq ifr; 2240 2241 chgdflags = ifp->if_flags ^ flags; 2242 cantflags = chgdflags & IFF_CANTCHANGE; 2243 2244 if (cantflags != 0) 2245 ifp->if_flags ^= cantflags; 2246 2247 /* Traditionally, we do not call if_ioctl after 2248 * setting/clearing only IFF_PROMISC if the interface 2249 * isn't IFF_UP. Uphold that tradition. 2250 */ 2251 if (chgdflags == IFF_PROMISC && (ifp->if_flags & IFF_UP) == 0) 2252 return 0; 2253 2254 memset(&ifr, 0, sizeof(ifr)); 2255 2256 ifr.ifr_flags = flags & ~IFF_CANTCHANGE; 2257 rc = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, &ifr); 2258 2259 if (rc != 0 && cantflags != 0) 2260 ifp->if_flags ^= cantflags; 2261 } 2262 2263 return rc; 2264 } 2265 2266 int 2267 if_mcast_op(ifnet_t *ifp, const unsigned long cmd, const struct sockaddr *sa) 2268 { 2269 int rc; 2270 struct ifreq ifr; 2271 2272 if (ifp->if_mcastop != NULL) 2273 rc = (*ifp->if_mcastop)(ifp, cmd, sa); 2274 else { 2275 ifreq_setaddr(cmd, &ifr, sa); 2276 rc = (*ifp->if_ioctl)(ifp, cmd, &ifr); 2277 } 2278 2279 return rc; 2280 } 2281 2282 static void 2283 sysctl_sndq_setup(struct sysctllog **clog, const char *ifname, 2284 struct ifaltq *ifq) 2285 { 2286 const struct sysctlnode *cnode, *rnode; 2287 2288 if (sysctl_createv(clog, 0, NULL, &rnode, 2289 CTLFLAG_PERMANENT, 2290 CTLTYPE_NODE, "interfaces", 2291 SYSCTL_DESCR("Per-interface controls"), 2292 NULL, 0, NULL, 0, 2293 CTL_NET, CTL_CREATE, CTL_EOL) != 0) 2294 goto bad; 2295 2296 if (sysctl_createv(clog, 0, &rnode, &rnode, 2297 CTLFLAG_PERMANENT, 2298 CTLTYPE_NODE, ifname, 2299 SYSCTL_DESCR("Interface controls"), 2300 NULL, 0, NULL, 0, 2301 CTL_CREATE, CTL_EOL) != 0) 2302 goto bad; 2303 2304 if (sysctl_createv(clog, 0, &rnode, &rnode, 2305 CTLFLAG_PERMANENT, 2306 CTLTYPE_NODE, "sndq", 2307 SYSCTL_DESCR("Interface output queue controls"), 2308 NULL, 0, NULL, 0, 2309 CTL_CREATE, CTL_EOL) != 0) 2310 goto bad; 2311 2312 if (sysctl_createv(clog, 0, &rnode, &cnode, 2313 CTLFLAG_PERMANENT, 2314 CTLTYPE_INT, "len", 2315 SYSCTL_DESCR("Current output queue length"), 2316 NULL, 0, &ifq->ifq_len, 0, 2317 CTL_CREATE, CTL_EOL) != 0) 2318 goto bad; 2319 2320 if (sysctl_createv(clog, 0, &rnode, &cnode, 2321 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2322 CTLTYPE_INT, "maxlen", 2323 SYSCTL_DESCR("Maximum allowed output queue length"), 2324 NULL, 0, &ifq->ifq_maxlen, 0, 2325 CTL_CREATE, CTL_EOL) != 0) 2326 goto bad; 2327 2328 if (sysctl_createv(clog, 0, &rnode, &cnode, 2329 CTLFLAG_PERMANENT, 2330 CTLTYPE_INT, "drops", 2331 SYSCTL_DESCR("Packets dropped due to full output queue"), 2332 NULL, 0, &ifq->ifq_drops, 0, 2333 CTL_CREATE, CTL_EOL) != 0) 2334 goto bad; 2335 2336 return; 2337 bad: 2338 printf("%s: could not attach sysctl nodes\n", ifname); 2339 return; 2340 } 2341 2342 #if defined(INET) || defined(INET6) 2343 2344 #define SYSCTL_NET_PKTQ(q, cn, c) \ 2345 static int \ 2346 sysctl_net_##q##_##cn(SYSCTLFN_ARGS) \ 2347 { \ 2348 return sysctl_pktq_count(SYSCTLFN_CALL(rnode), q, c); \ 2349 } 2350 2351 #if defined(INET) 2352 static int 2353 sysctl_net_ip_pktq_maxlen(SYSCTLFN_ARGS) 2354 { 2355 return sysctl_pktq_maxlen(SYSCTLFN_CALL(rnode), ip_pktq); 2356 } 2357 SYSCTL_NET_PKTQ(ip_pktq, items, PKTQ_NITEMS) 2358 SYSCTL_NET_PKTQ(ip_pktq, drops, PKTQ_DROPS) 2359 #endif 2360 2361 #if defined(INET6) 2362 static int 2363 sysctl_net_ip6_pktq_maxlen(SYSCTLFN_ARGS) 2364 { 2365 return sysctl_pktq_maxlen(SYSCTLFN_CALL(rnode), ip6_pktq); 2366 } 2367 SYSCTL_NET_PKTQ(ip6_pktq, items, PKTQ_NITEMS) 2368 SYSCTL_NET_PKTQ(ip6_pktq, drops, PKTQ_DROPS) 2369 #endif 2370 2371 static void 2372 sysctl_net_pktq_setup(struct sysctllog **clog, int pf) 2373 { 2374 sysctlfn len_func = NULL, maxlen_func = NULL, drops_func = NULL; 2375 const char *pfname = NULL, *ipname = NULL; 2376 int ipn = 0, qid = 0; 2377 2378 switch (pf) { 2379 #if defined(INET) 2380 case PF_INET: 2381 len_func = sysctl_net_ip_pktq_items; 2382 maxlen_func = sysctl_net_ip_pktq_maxlen; 2383 drops_func = sysctl_net_ip_pktq_drops; 2384 pfname = "inet", ipn = IPPROTO_IP; 2385 ipname = "ip", qid = IPCTL_IFQ; 2386 break; 2387 #endif 2388 #if defined(INET6) 2389 case PF_INET6: 2390 len_func = sysctl_net_ip6_pktq_items; 2391 maxlen_func = sysctl_net_ip6_pktq_maxlen; 2392 drops_func = sysctl_net_ip6_pktq_drops; 2393 pfname = "inet6", ipn = IPPROTO_IPV6; 2394 ipname = "ip6", qid = IPV6CTL_IFQ; 2395 break; 2396 #endif 2397 default: 2398 KASSERT(false); 2399 } 2400 2401 sysctl_createv(clog, 0, NULL, NULL, 2402 CTLFLAG_PERMANENT, 2403 CTLTYPE_NODE, pfname, NULL, 2404 NULL, 0, NULL, 0, 2405 CTL_NET, pf, CTL_EOL); 2406 sysctl_createv(clog, 0, NULL, NULL, 2407 CTLFLAG_PERMANENT, 2408 CTLTYPE_NODE, ipname, NULL, 2409 NULL, 0, NULL, 0, 2410 CTL_NET, pf, ipn, CTL_EOL); 2411 sysctl_createv(clog, 0, NULL, NULL, 2412 CTLFLAG_PERMANENT, 2413 CTLTYPE_NODE, "ifq", 2414 SYSCTL_DESCR("Protocol input queue controls"), 2415 NULL, 0, NULL, 0, 2416 CTL_NET, pf, ipn, qid, CTL_EOL); 2417 2418 sysctl_createv(clog, 0, NULL, NULL, 2419 CTLFLAG_PERMANENT, 2420 CTLTYPE_INT, "len", 2421 SYSCTL_DESCR("Current input queue length"), 2422 len_func, 0, NULL, 0, 2423 CTL_NET, pf, ipn, qid, IFQCTL_LEN, CTL_EOL); 2424 sysctl_createv(clog, 0, NULL, NULL, 2425 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2426 CTLTYPE_INT, "maxlen", 2427 SYSCTL_DESCR("Maximum allowed input queue length"), 2428 maxlen_func, 0, NULL, 0, 2429 CTL_NET, pf, ipn, qid, IFQCTL_MAXLEN, CTL_EOL); 2430 sysctl_createv(clog, 0, NULL, NULL, 2431 CTLFLAG_PERMANENT, 2432 CTLTYPE_INT, "drops", 2433 SYSCTL_DESCR("Packets dropped due to full input queue"), 2434 drops_func, 0, NULL, 0, 2435 CTL_NET, pf, ipn, qid, IFQCTL_DROPS, CTL_EOL); 2436 } 2437 #endif /* INET || INET6 */ 2438 2439 static int 2440 if_sdl_sysctl(SYSCTLFN_ARGS) 2441 { 2442 struct ifnet *ifp; 2443 const struct sockaddr_dl *sdl; 2444 2445 if (namelen != 1) 2446 return EINVAL; 2447 2448 ifp = if_byindex(name[0]); 2449 if (ifp == NULL) 2450 return ENODEV; 2451 2452 sdl = ifp->if_sadl; 2453 if (sdl == NULL) { 2454 *oldlenp = 0; 2455 return 0; 2456 } 2457 2458 if (oldp == NULL) { 2459 *oldlenp = sdl->sdl_alen; 2460 return 0; 2461 } 2462 2463 if (*oldlenp >= sdl->sdl_alen) 2464 *oldlenp = sdl->sdl_alen; 2465 return sysctl_copyout(l, &sdl->sdl_data[sdl->sdl_nlen], oldp, *oldlenp); 2466 } 2467 2468 SYSCTL_SETUP(sysctl_net_sdl_setup, "sysctl net.sdl subtree setup") 2469 { 2470 const struct sysctlnode *rnode = NULL; 2471 2472 sysctl_createv(clog, 0, NULL, &rnode, 2473 CTLFLAG_PERMANENT, 2474 CTLTYPE_NODE, "sdl", 2475 SYSCTL_DESCR("Get active link-layer address"), 2476 if_sdl_sysctl, 0, NULL, 0, 2477 CTL_NET, CTL_CREATE, CTL_EOL); 2478 } 2479
Indexes created Sun Sep 21 20:09:37 GMT 2025