1 /* $NetBSD: if.c,v 1.208 2007/12/06 02:23:42 dyoung Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000, 2001 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the project nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 */ 67 68 /* 69 * Copyright (c) 1980, 1986, 1993 70 * The Regents of the University of California. All rights reserved. 71 * 72 * Redistribution and use in source and binary forms, with or without 73 * modification, are permitted provided that the following conditions 74 * are met: 75 * 1. Redistributions of source code must retain the above copyright 76 * notice, this list of conditions and the following disclaimer. 77 * 2. Redistributions in binary form must reproduce the above copyright 78 * notice, this list of conditions and the following disclaimer in the 79 * documentation and/or other materials provided with the distribution. 80 * 3. Neither the name of the University nor the names of its contributors 81 * may be used to endorse or promote products derived from this software 82 * without specific prior written permission. 83 * 84 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 85 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 86 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 87 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 88 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 89 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 90 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 91 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 92 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 93 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 94 * SUCH DAMAGE. 95 * 96 * @(#)if.c 8.5 (Berkeley) 1/9/95 97 */ 98 99 #include <sys/cdefs.h> 100 __KERNEL_RCSID(0, "$NetBSD: if.c,v 1.208 2007/12/06 02:23:42 dyoung Exp $"); 101 102 #include "opt_inet.h" 103 104 #include "opt_atalk.h" 105 #include "opt_natm.h" 106 #include "opt_pfil_hooks.h" 107 108 #include <sys/param.h> 109 #include <sys/mbuf.h> 110 #include <sys/systm.h> 111 #include <sys/callout.h> 112 #include <sys/proc.h> 113 #include <sys/socket.h> 114 #include <sys/socketvar.h> 115 #include <sys/domain.h> 116 #include <sys/protosw.h> 117 #include <sys/kernel.h> 118 #include <sys/ioctl.h> 119 #include <sys/sysctl.h> 120 #include <sys/syslog.h> 121 #include <sys/kauth.h> 122 123 #include <net/if.h> 124 #include <net/if_dl.h> 125 #include <net/if_ether.h> 126 #include <net/if_media.h> 127 #include <net80211/ieee80211.h> 128 #include <net80211/ieee80211_ioctl.h> 129 #include <net/if_types.h> 130 #include <net/radix.h> 131 #include <net/route.h> 132 #include <net/netisr.h> 133 #ifdef NETATALK 134 #include <netatalk/at_extern.h> 135 #include <netatalk/at.h> 136 #endif 137 #include <net/pfil.h> 138 139 #ifdef INET6 140 #include <netinet/in.h> 141 #include <netinet6/in6_var.h> 142 #include <netinet6/nd6.h> 143 #endif 144 145 #include "carp.h" 146 #if NCARP > 0 147 #include <netinet/ip_carp.h> 148 #endif 149 150 #include <compat/sys/sockio.h> 151 #include <compat/sys/socket.h> 152 153 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 154 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 155 156 int ifqmaxlen = IFQ_MAXLEN; 157 callout_t if_slowtimo_ch; 158 159 int netisr; /* scheduling bits for network */ 160 161 static int if_rt_walktree(struct rtentry *, void *); 162 163 static struct if_clone *if_clone_lookup(const char *, int *); 164 static int if_clone_list(struct if_clonereq *); 165 166 static LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 167 static int if_cloners_count; 168 169 #ifdef PFIL_HOOKS 170 struct pfil_head if_pfil; /* packet filtering hook for interfaces */ 171 #endif 172 173 static void if_detach_queues(struct ifnet *, struct ifqueue *); 174 175 /* 176 * Network interface utility routines. 177 * 178 * Routines with ifa_ifwith* names take sockaddr *'s as 179 * parameters. 180 */ 181 void 182 ifinit(void) 183 { 184 185 callout_init(&if_slowtimo_ch, 0); 186 if_slowtimo(NULL); 187 #ifdef PFIL_HOOKS 188 if_pfil.ph_type = PFIL_TYPE_IFNET; 189 if_pfil.ph_ifnet = NULL; 190 if (pfil_head_register(&if_pfil) != 0) 191 printf("WARNING: unable to register pfil hook\n"); 192 #endif 193 } 194 195 /* 196 * Null routines used while an interface is going away. These routines 197 * just return an error. 198 */ 199 200 int 201 if_nulloutput(struct ifnet *ifp, struct mbuf *m, 202 const struct sockaddr *so, struct rtentry *rt) 203 { 204 205 return ENXIO; 206 } 207 208 void 209 if_nullinput(struct ifnet *ifp, struct mbuf *m) 210 { 211 212 /* Nothing. */ 213 } 214 215 void 216 if_nullstart(struct ifnet *ifp) 217 { 218 219 /* Nothing. */ 220 } 221 222 int 223 if_nullioctl(struct ifnet *ifp, u_long cmd, void *data) 224 { 225 226 return ENXIO; 227 } 228 229 int 230 if_nullinit(struct ifnet *ifp) 231 { 232 233 return ENXIO; 234 } 235 236 void 237 if_nullstop(struct ifnet *ifp, int disable) 238 { 239 240 /* Nothing. */ 241 } 242 243 void 244 if_nullwatchdog(struct ifnet *ifp) 245 { 246 247 /* Nothing. */ 248 } 249 250 void 251 if_nulldrain(struct ifnet *ifp) 252 { 253 254 /* Nothing. */ 255 } 256 257 static u_int if_index = 1; 258 struct ifnet_head ifnet; 259 size_t if_indexlim = 0; 260 struct ifaddr **ifnet_addrs = NULL; 261 struct ifnet **ifindex2ifnet = NULL; 262 struct ifnet *lo0ifp; 263 264 /* 265 * Allocate the link level name for the specified interface. This 266 * is an attachment helper. It must be called after ifp->if_addrlen 267 * is initialized, which may not be the case when if_attach() is 268 * called. 269 */ 270 void 271 if_alloc_sadl(struct ifnet *ifp) 272 { 273 unsigned socksize, ifasize; 274 int addrlen, namelen; 275 struct sockaddr_dl *mask, *sdl; 276 struct ifaddr *ifa; 277 278 /* 279 * If the interface already has a link name, release it 280 * now. This is useful for interfaces that can change 281 * link types, and thus switch link names often. 282 */ 283 if (ifp->if_sadl != NULL) 284 if_free_sadl(ifp); 285 286 namelen = strlen(ifp->if_xname); 287 addrlen = ifp->if_addrlen; 288 socksize = roundup(sockaddr_dl_measure(namelen, addrlen), sizeof(long)); 289 ifasize = sizeof(*ifa) + 2 * socksize; 290 ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK|M_ZERO); 291 292 sdl = (struct sockaddr_dl *)(ifa + 1); 293 mask = (struct sockaddr_dl *)(socksize + (char *)sdl); 294 295 sockaddr_dl_init(sdl, socksize, ifp->if_index, ifp->if_type, 296 ifp->if_xname, namelen, NULL, addrlen); 297 mask->sdl_len = sockaddr_dl_measure(namelen, 0); 298 memset(&mask->sdl_data[0], 0xff, namelen); 299 300 ifnet_addrs[ifp->if_index] = ifa; 301 IFAREF(ifa); 302 ifa_insert(ifp, ifa); 303 ifa->ifa_rtrequest = link_rtrequest; 304 ifa->ifa_addr = (struct sockaddr *)sdl; 305 ifp->if_sadl = sdl; 306 ifa->ifa_netmask = (struct sockaddr *)mask; 307 } 308 309 /* 310 * Free the link level name for the specified interface. This is 311 * a detach helper. This is called from if_detach() or from 312 * link layer type specific detach functions. 313 */ 314 void 315 if_free_sadl(struct ifnet *ifp) 316 { 317 struct ifaddr *ifa; 318 int s; 319 320 ifa = ifnet_addrs[ifp->if_index]; 321 if (ifa == NULL) { 322 KASSERT(ifp->if_sadl == NULL); 323 return; 324 } 325 326 KASSERT(ifp->if_sadl != NULL); 327 328 s = splnet(); 329 rtinit(ifa, RTM_DELETE, 0); 330 ifa_remove(ifp, ifa); 331 332 ifp->if_sadl = NULL; 333 334 ifnet_addrs[ifp->if_index] = NULL; 335 IFAFREE(ifa); 336 splx(s); 337 } 338 339 /* 340 * Attach an interface to the 341 * list of "active" interfaces. 342 */ 343 void 344 if_attach(struct ifnet *ifp) 345 { 346 int indexlim = 0; 347 348 if (if_indexlim == 0) { 349 TAILQ_INIT(&ifnet); 350 if_indexlim = 8; 351 } 352 TAILQ_INIT(&ifp->if_addrlist); 353 TAILQ_INSERT_TAIL(&ifnet, ifp, if_list); 354 ifp->if_index = if_index; 355 if (ifindex2ifnet == NULL) 356 if_index++; 357 else 358 while (ifp->if_index < if_indexlim && 359 ifindex2ifnet[ifp->if_index] != NULL) { 360 ++if_index; 361 if (if_index == 0) 362 if_index = 1; 363 /* 364 * If we hit USHRT_MAX, we skip back to 0 since 365 * there are a number of places where the value 366 * of if_index or if_index itself is compared 367 * to or stored in an unsigned short. By 368 * jumping back, we won't botch those assignments 369 * or comparisons. 370 */ 371 else if (if_index == USHRT_MAX) { 372 /* 373 * However, if we have to jump back to 374 * zero *twice* without finding an empty 375 * slot in ifindex2ifnet[], then there 376 * there are too many (>65535) interfaces. 377 */ 378 if (indexlim++) 379 panic("too many interfaces"); 380 else 381 if_index = 1; 382 } 383 ifp->if_index = if_index; 384 } 385 386 /* 387 * We have some arrays that should be indexed by if_index. 388 * since if_index will grow dynamically, they should grow too. 389 * struct ifadd **ifnet_addrs 390 * struct ifnet **ifindex2ifnet 391 */ 392 if (ifnet_addrs == NULL || ifindex2ifnet == NULL || 393 ifp->if_index >= if_indexlim) { 394 size_t m, n, oldlim; 395 void *q; 396 397 oldlim = if_indexlim; 398 while (ifp->if_index >= if_indexlim) 399 if_indexlim <<= 1; 400 401 /* grow ifnet_addrs */ 402 m = oldlim * sizeof(struct ifaddr *); 403 n = if_indexlim * sizeof(struct ifaddr *); 404 q = (void *)malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 405 if (ifnet_addrs != NULL) { 406 memcpy(q, ifnet_addrs, m); 407 free((void *)ifnet_addrs, M_IFADDR); 408 } 409 ifnet_addrs = (struct ifaddr **)q; 410 411 /* grow ifindex2ifnet */ 412 m = oldlim * sizeof(struct ifnet *); 413 n = if_indexlim * sizeof(struct ifnet *); 414 q = (void *)malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 415 if (ifindex2ifnet != NULL) { 416 memcpy(q, (void *)ifindex2ifnet, m); 417 free((void *)ifindex2ifnet, M_IFADDR); 418 } 419 ifindex2ifnet = (struct ifnet **)q; 420 } 421 422 ifindex2ifnet[ifp->if_index] = ifp; 423 424 /* 425 * Link level name is allocated later by a separate call to 426 * if_alloc_sadl(). 427 */ 428 429 if (ifp->if_snd.ifq_maxlen == 0) 430 ifp->if_snd.ifq_maxlen = ifqmaxlen; 431 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 432 433 ifp->if_link_state = LINK_STATE_UNKNOWN; 434 435 ifp->if_capenable = 0; 436 ifp->if_csum_flags_tx = 0; 437 ifp->if_csum_flags_rx = 0; 438 439 #ifdef ALTQ 440 ifp->if_snd.altq_type = 0; 441 ifp->if_snd.altq_disc = NULL; 442 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 443 ifp->if_snd.altq_tbr = NULL; 444 ifp->if_snd.altq_ifp = ifp; 445 #endif 446 447 #ifdef PFIL_HOOKS 448 ifp->if_pfil.ph_type = PFIL_TYPE_IFNET; 449 ifp->if_pfil.ph_ifnet = ifp; 450 if (pfil_head_register(&ifp->if_pfil) != 0) 451 printf("%s: WARNING: unable to register pfil hook\n", 452 ifp->if_xname); 453 (void)pfil_run_hooks(&if_pfil, 454 (struct mbuf **)PFIL_IFNET_ATTACH, ifp, PFIL_IFNET); 455 #endif 456 457 if (!STAILQ_EMPTY(&domains)) 458 if_attachdomain1(ifp); 459 460 /* Announce the interface. */ 461 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 462 } 463 464 void 465 if_attachdomain(void) 466 { 467 struct ifnet *ifp; 468 int s; 469 470 s = splnet(); 471 IFNET_FOREACH(ifp) 472 if_attachdomain1(ifp); 473 splx(s); 474 } 475 476 void 477 if_attachdomain1(struct ifnet *ifp) 478 { 479 struct domain *dp; 480 int s; 481 482 s = splnet(); 483 484 /* address family dependent data region */ 485 memset(ifp->if_afdata, 0, sizeof(ifp->if_afdata)); 486 DOMAIN_FOREACH(dp) { 487 if (dp->dom_ifattach != NULL) 488 ifp->if_afdata[dp->dom_family] = 489 (*dp->dom_ifattach)(ifp); 490 } 491 492 splx(s); 493 } 494 495 /* 496 * Deactivate an interface. This points all of the procedure 497 * handles at error stubs. May be called from interrupt context. 498 */ 499 void 500 if_deactivate(struct ifnet *ifp) 501 { 502 int s; 503 504 s = splnet(); 505 506 ifp->if_output = if_nulloutput; 507 ifp->if_input = if_nullinput; 508 ifp->if_start = if_nullstart; 509 ifp->if_ioctl = if_nullioctl; 510 ifp->if_init = if_nullinit; 511 ifp->if_stop = if_nullstop; 512 ifp->if_watchdog = if_nullwatchdog; 513 ifp->if_drain = if_nulldrain; 514 515 /* No more packets may be enqueued. */ 516 ifp->if_snd.ifq_maxlen = 0; 517 518 splx(s); 519 } 520 521 void 522 if_purgeaddrs(struct ifnet *ifp, int family, 523 void (*purgeaddr)(struct ifaddr *)) 524 { 525 struct ifaddr *ifa, *nifa; 526 527 for (ifa = IFADDR_FIRST(ifp); ifa != NULL; ifa = nifa) { 528 nifa = IFADDR_NEXT(ifa); 529 if (ifa->ifa_addr->sa_family != family) 530 continue; 531 (*purgeaddr)(ifa); 532 } 533 } 534 535 /* 536 * Detach an interface from the list of "active" interfaces, 537 * freeing any resources as we go along. 538 * 539 * NOTE: This routine must be called with a valid thread context, 540 * as it may block. 541 */ 542 void 543 if_detach(struct ifnet *ifp) 544 { 545 struct socket so; 546 struct ifaddr *ifa; 547 #ifdef IFAREF_DEBUG 548 struct ifaddr *last_ifa = NULL; 549 #endif 550 struct domain *dp; 551 const struct protosw *pr; 552 int s, i, family, purged; 553 554 /* 555 * XXX It's kind of lame that we have to have the 556 * XXX socket structure... 557 */ 558 memset(&so, 0, sizeof(so)); 559 560 s = splnet(); 561 562 /* 563 * Do an if_down() to give protocols a chance to do something. 564 */ 565 if_down(ifp); 566 567 #ifdef ALTQ 568 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 569 altq_disable(&ifp->if_snd); 570 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 571 altq_detach(&ifp->if_snd); 572 #endif 573 574 575 #if NCARP > 0 576 /* Remove the interface from any carp group it is a part of. */ 577 if (ifp->if_carp != NULL && ifp->if_type != IFT_CARP) 578 carp_ifdetach(ifp); 579 #endif 580 581 /* 582 * Rip all the addresses off the interface. This should make 583 * all of the routes go away. 584 * 585 * pr_usrreq calls can remove an arbitrary number of ifaddrs 586 * from the list, including our "cursor", ifa. For safety, 587 * and to honor the TAILQ abstraction, I just restart the 588 * loop after each removal. Note that the loop will exit 589 * when all of the remaining ifaddrs belong to the AF_LINK 590 * family. I am counting on the historical fact that at 591 * least one pr_usrreq in each address domain removes at 592 * least one ifaddr. 593 */ 594 again: 595 IFADDR_FOREACH(ifa, ifp) { 596 family = ifa->ifa_addr->sa_family; 597 #ifdef IFAREF_DEBUG 598 printf("if_detach: ifaddr %p, family %d, refcnt %d\n", 599 ifa, family, ifa->ifa_refcnt); 600 if (last_ifa != NULL && ifa == last_ifa) 601 panic("if_detach: loop detected"); 602 last_ifa = ifa; 603 #endif 604 if (family == AF_LINK) 605 continue; 606 dp = pffinddomain(family); 607 #ifdef DIAGNOSTIC 608 if (dp == NULL) 609 panic("if_detach: no domain for AF %d", 610 family); 611 #endif 612 /* 613 * XXX These PURGEIF calls are redundant with the 614 * purge-all-families calls below, but are left in for 615 * now both to make a smaller change, and to avoid 616 * unplanned interactions with clearing of 617 * ifp->if_addrlist. 618 */ 619 purged = 0; 620 for (pr = dp->dom_protosw; 621 pr < dp->dom_protoswNPROTOSW; pr++) { 622 so.so_proto = pr; 623 if (pr->pr_usrreq != NULL) { 624 (void) (*pr->pr_usrreq)(&so, 625 PRU_PURGEIF, NULL, NULL, 626 (struct mbuf *) ifp, curlwp); 627 purged = 1; 628 } 629 } 630 if (purged == 0) { 631 /* 632 * XXX What's really the best thing to do 633 * XXX here? --thorpej@NetBSD.org 634 */ 635 printf("if_detach: WARNING: AF %d not purged\n", 636 family); 637 ifa_remove(ifp, ifa); 638 } 639 goto again; 640 } 641 642 if_free_sadl(ifp); 643 644 /* Walk the routing table looking for stragglers. */ 645 for (i = 0; i <= AF_MAX; i++) 646 (void)rt_walktree(i, if_rt_walktree, ifp); 647 648 DOMAIN_FOREACH(dp) { 649 if (dp->dom_ifdetach != NULL && ifp->if_afdata[dp->dom_family]) 650 (*dp->dom_ifdetach)(ifp, 651 ifp->if_afdata[dp->dom_family]); 652 653 /* 654 * One would expect multicast memberships (INET and 655 * INET6) on UDP sockets to be purged by the PURGEIF 656 * calls above, but if all addresses were removed from 657 * the interface prior to destruction, the calls will 658 * not be made (e.g. ppp, for which pppd(8) generally 659 * removes addresses before destroying the interface). 660 * Because there is no invariant that multicast 661 * memberships only exist for interfaces with IPv4 662 * addresses, we must call PURGEIF regardless of 663 * addresses. (Protocols which might store ifnet 664 * pointers are marked with PR_PURGEIF.) 665 */ 666 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 667 so.so_proto = pr; 668 if (pr->pr_usrreq != NULL && pr->pr_flags & PR_PURGEIF) 669 (void)(*pr->pr_usrreq)(&so, PRU_PURGEIF, NULL, 670 NULL, (struct mbuf *)ifp, curlwp); 671 } 672 } 673 674 #ifdef PFIL_HOOKS 675 (void)pfil_run_hooks(&if_pfil, 676 (struct mbuf **)PFIL_IFNET_DETACH, ifp, PFIL_IFNET); 677 (void)pfil_head_unregister(&ifp->if_pfil); 678 #endif 679 680 /* Announce that the interface is gone. */ 681 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 682 683 ifindex2ifnet[ifp->if_index] = NULL; 684 685 TAILQ_REMOVE(&ifnet, ifp, if_list); 686 687 /* 688 * remove packets that came from ifp, from software interrupt queues. 689 */ 690 DOMAIN_FOREACH(dp) { 691 for (i = 0; i < __arraycount(dp->dom_ifqueues); i++) { 692 if (dp->dom_ifqueues[i] == NULL) 693 break; 694 if_detach_queues(ifp, dp->dom_ifqueues[i]); 695 } 696 } 697 698 splx(s); 699 } 700 701 static void 702 if_detach_queues(struct ifnet *ifp, struct ifqueue *q) 703 { 704 struct mbuf *m, *prev, *next; 705 706 prev = NULL; 707 for (m = q->ifq_head; m != NULL; m = next) { 708 next = m->m_nextpkt; 709 #ifdef DIAGNOSTIC 710 if ((m->m_flags & M_PKTHDR) == 0) { 711 prev = m; 712 continue; 713 } 714 #endif 715 if (m->m_pkthdr.rcvif != ifp) { 716 prev = m; 717 continue; 718 } 719 720 if (prev != NULL) 721 prev->m_nextpkt = m->m_nextpkt; 722 else 723 q->ifq_head = m->m_nextpkt; 724 if (q->ifq_tail == m) 725 q->ifq_tail = prev; 726 q->ifq_len--; 727 728 m->m_nextpkt = NULL; 729 m_freem(m); 730 IF_DROP(q); 731 } 732 } 733 734 /* 735 * Callback for a radix tree walk to delete all references to an 736 * ifnet. 737 */ 738 static int 739 if_rt_walktree(struct rtentry *rt, void *v) 740 { 741 struct ifnet *ifp = (struct ifnet *)v; 742 int error; 743 744 if (rt->rt_ifp != ifp) 745 return 0; 746 747 /* Delete the entry. */ 748 ++rt->rt_refcnt; 749 error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway, 750 rt_mask(rt), rt->rt_flags, NULL); 751 KASSERT((rt->rt_flags & RTF_UP) == 0); 752 rt->rt_ifp = NULL; 753 RTFREE(rt); 754 if (error != 0) 755 printf("%s: warning: unable to delete rtentry @ %p, " 756 "error = %d\n", ifp->if_xname, rt, error); 757 return 0; 758 } 759 760 /* 761 * Create a clone network interface. 762 */ 763 int 764 if_clone_create(const char *name) 765 { 766 struct if_clone *ifc; 767 int unit; 768 769 ifc = if_clone_lookup(name, &unit); 770 if (ifc == NULL) 771 return EINVAL; 772 773 if (ifunit(name) != NULL) 774 return EEXIST; 775 776 return (*ifc->ifc_create)(ifc, unit); 777 } 778 779 /* 780 * Destroy a clone network interface. 781 */ 782 int 783 if_clone_destroy(const char *name) 784 { 785 struct if_clone *ifc; 786 struct ifnet *ifp; 787 788 ifc = if_clone_lookup(name, NULL); 789 if (ifc == NULL) 790 return EINVAL; 791 792 ifp = ifunit(name); 793 if (ifp == NULL) 794 return ENXIO; 795 796 if (ifc->ifc_destroy == NULL) 797 return EOPNOTSUPP; 798 799 return (*ifc->ifc_destroy)(ifp); 800 } 801 802 /* 803 * Look up a network interface cloner. 804 */ 805 static struct if_clone * 806 if_clone_lookup(const char *name, int *unitp) 807 { 808 struct if_clone *ifc; 809 const char *cp; 810 int unit; 811 812 /* separate interface name from unit */ 813 for (cp = name; 814 cp - name < IFNAMSIZ && *cp && (*cp < '0' || *cp > '9'); 815 cp++) 816 continue; 817 818 if (cp == name || cp - name == IFNAMSIZ || !*cp) 819 return NULL; /* No name or unit number */ 820 821 LIST_FOREACH(ifc, &if_cloners, ifc_list) { 822 if (strlen(ifc->ifc_name) == cp - name && 823 strncmp(name, ifc->ifc_name, cp - name) == 0) 824 break; 825 } 826 827 if (ifc == NULL) 828 return NULL; 829 830 unit = 0; 831 while (cp - name < IFNAMSIZ && *cp) { 832 if (*cp < '0' || *cp > '9' || unit > INT_MAX / 10) { 833 /* Bogus unit number. */ 834 return NULL; 835 } 836 unit = (unit * 10) + (*cp++ - '0'); 837 } 838 839 if (unitp != NULL) 840 *unitp = unit; 841 return ifc; 842 } 843 844 /* 845 * Register a network interface cloner. 846 */ 847 void 848 if_clone_attach(struct if_clone *ifc) 849 { 850 851 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 852 if_cloners_count++; 853 } 854 855 /* 856 * Unregister a network interface cloner. 857 */ 858 void 859 if_clone_detach(struct if_clone *ifc) 860 { 861 862 LIST_REMOVE(ifc, ifc_list); 863 if_cloners_count--; 864 } 865 866 /* 867 * Provide list of interface cloners to userspace. 868 */ 869 static int 870 if_clone_list(struct if_clonereq *ifcr) 871 { 872 char outbuf[IFNAMSIZ], *dst; 873 struct if_clone *ifc; 874 int count, error = 0; 875 876 ifcr->ifcr_total = if_cloners_count; 877 if ((dst = ifcr->ifcr_buffer) == NULL) { 878 /* Just asking how many there are. */ 879 return 0; 880 } 881 882 if (ifcr->ifcr_count < 0) 883 return EINVAL; 884 885 count = (if_cloners_count < ifcr->ifcr_count) ? 886 if_cloners_count : ifcr->ifcr_count; 887 888 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 889 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 890 (void)strncpy(outbuf, ifc->ifc_name, sizeof(outbuf)); 891 if (outbuf[sizeof(outbuf) - 1] != '\0') 892 return ENAMETOOLONG; 893 error = copyout(outbuf, dst, sizeof(outbuf)); 894 if (error != 0) 895 break; 896 } 897 898 return error; 899 } 900 901 void 902 ifa_insert(struct ifnet *ifp, struct ifaddr *ifa) 903 { 904 ifa->ifa_ifp = ifp; 905 TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list); 906 IFAREF(ifa); 907 } 908 909 void 910 ifa_remove(struct ifnet *ifp, struct ifaddr *ifa) 911 { 912 KASSERT(ifa->ifa_ifp == ifp); 913 TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list); 914 IFAFREE(ifa); 915 } 916 917 static inline int 918 equal(const struct sockaddr *sa1, const struct sockaddr *sa2) 919 { 920 return sockaddr_cmp(sa1, sa2) == 0; 921 } 922 923 /* 924 * Locate an interface based on a complete address. 925 */ 926 /*ARGSUSED*/ 927 struct ifaddr * 928 ifa_ifwithaddr(const struct sockaddr *addr) 929 { 930 struct ifnet *ifp; 931 struct ifaddr *ifa; 932 933 IFNET_FOREACH(ifp) { 934 if (ifp->if_output == if_nulloutput) 935 continue; 936 IFADDR_FOREACH(ifa, ifp) { 937 if (ifa->ifa_addr->sa_family != addr->sa_family) 938 continue; 939 if (equal(addr, ifa->ifa_addr)) 940 return ifa; 941 if ((ifp->if_flags & IFF_BROADCAST) && 942 ifa->ifa_broadaddr && 943 /* IP6 doesn't have broadcast */ 944 ifa->ifa_broadaddr->sa_len != 0 && 945 equal(ifa->ifa_broadaddr, addr)) 946 return ifa; 947 } 948 } 949 return NULL; 950 } 951 952 /* 953 * Locate the point to point interface with a given destination address. 954 */ 955 /*ARGSUSED*/ 956 struct ifaddr * 957 ifa_ifwithdstaddr(const struct sockaddr *addr) 958 { 959 struct ifnet *ifp; 960 struct ifaddr *ifa; 961 962 IFNET_FOREACH(ifp) { 963 if (ifp->if_output == if_nulloutput) 964 continue; 965 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 966 continue; 967 IFADDR_FOREACH(ifa, ifp) { 968 if (ifa->ifa_addr->sa_family != addr->sa_family || 969 ifa->ifa_dstaddr == NULL) 970 continue; 971 if (equal(addr, ifa->ifa_dstaddr)) 972 return ifa; 973 } 974 } 975 return NULL; 976 } 977 978 /* 979 * Find an interface on a specific network. If many, choice 980 * is most specific found. 981 */ 982 struct ifaddr * 983 ifa_ifwithnet(const struct sockaddr *addr) 984 { 985 struct ifnet *ifp; 986 struct ifaddr *ifa; 987 const struct sockaddr_dl *sdl; 988 struct ifaddr *ifa_maybe = 0; 989 u_int af = addr->sa_family; 990 const char *addr_data = addr->sa_data, *cplim; 991 992 if (af == AF_LINK) { 993 sdl = satocsdl(addr); 994 if (sdl->sdl_index && sdl->sdl_index < if_indexlim && 995 ifindex2ifnet[sdl->sdl_index] && 996 ifindex2ifnet[sdl->sdl_index]->if_output != if_nulloutput) 997 return ifnet_addrs[sdl->sdl_index]; 998 } 999 #ifdef NETATALK 1000 if (af == AF_APPLETALK) { 1001 const struct sockaddr_at *sat, *sat2; 1002 sat = (const struct sockaddr_at *)addr; 1003 IFNET_FOREACH(ifp) { 1004 if (ifp->if_output == if_nulloutput) 1005 continue; 1006 ifa = at_ifawithnet((const struct sockaddr_at *)addr, ifp); 1007 if (ifa == NULL) 1008 continue; 1009 sat2 = (struct sockaddr_at *)ifa->ifa_addr; 1010 if (sat2->sat_addr.s_net == sat->sat_addr.s_net) 1011 return ifa; /* exact match */ 1012 if (ifa_maybe == NULL) { 1013 /* else keep the if with the right range */ 1014 ifa_maybe = ifa; 1015 } 1016 } 1017 return ifa_maybe; 1018 } 1019 #endif 1020 IFNET_FOREACH(ifp) { 1021 if (ifp->if_output == if_nulloutput) 1022 continue; 1023 IFADDR_FOREACH(ifa, ifp) { 1024 const char *cp, *cp2, *cp3; 1025 1026 if (ifa->ifa_addr->sa_family != af || 1027 ifa->ifa_netmask == NULL) 1028 next: continue; 1029 cp = addr_data; 1030 cp2 = ifa->ifa_addr->sa_data; 1031 cp3 = ifa->ifa_netmask->sa_data; 1032 cplim = (const char *)ifa->ifa_netmask + 1033 ifa->ifa_netmask->sa_len; 1034 while (cp3 < cplim) { 1035 if ((*cp++ ^ *cp2++) & *cp3++) { 1036 /* want to continue for() loop */ 1037 goto next; 1038 } 1039 } 1040 if (ifa_maybe == NULL || 1041 rn_refines((void *)ifa->ifa_netmask, 1042 (void *)ifa_maybe->ifa_netmask)) 1043 ifa_maybe = ifa; 1044 } 1045 } 1046 return ifa_maybe; 1047 } 1048 1049 /* 1050 * Find the interface of the addresss. 1051 */ 1052 struct ifaddr * 1053 ifa_ifwithladdr(const struct sockaddr *addr) 1054 { 1055 struct ifaddr *ia; 1056 1057 if ((ia = ifa_ifwithaddr(addr)) || (ia = ifa_ifwithdstaddr(addr)) || 1058 (ia = ifa_ifwithnet(addr))) 1059 return ia; 1060 return NULL; 1061 } 1062 1063 /* 1064 * Find an interface using a specific address family 1065 */ 1066 struct ifaddr * 1067 ifa_ifwithaf(int af) 1068 { 1069 struct ifnet *ifp; 1070 struct ifaddr *ifa; 1071 1072 IFNET_FOREACH(ifp) { 1073 if (ifp->if_output == if_nulloutput) 1074 continue; 1075 IFADDR_FOREACH(ifa, ifp) { 1076 if (ifa->ifa_addr->sa_family == af) 1077 return ifa; 1078 } 1079 } 1080 return NULL; 1081 } 1082 1083 /* 1084 * Find an interface address specific to an interface best matching 1085 * a given address. 1086 */ 1087 struct ifaddr * 1088 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 1089 { 1090 struct ifaddr *ifa; 1091 const char *cp, *cp2, *cp3; 1092 const char *cplim; 1093 struct ifaddr *ifa_maybe = 0; 1094 u_int af = addr->sa_family; 1095 1096 if (ifp->if_output == if_nulloutput) 1097 return NULL; 1098 1099 if (af >= AF_MAX) 1100 return NULL; 1101 1102 IFADDR_FOREACH(ifa, ifp) { 1103 if (ifa->ifa_addr->sa_family != af) 1104 continue; 1105 ifa_maybe = ifa; 1106 if (ifa->ifa_netmask == NULL) { 1107 if (equal(addr, ifa->ifa_addr) || 1108 (ifa->ifa_dstaddr && 1109 equal(addr, ifa->ifa_dstaddr))) 1110 return ifa; 1111 continue; 1112 } 1113 cp = addr->sa_data; 1114 cp2 = ifa->ifa_addr->sa_data; 1115 cp3 = ifa->ifa_netmask->sa_data; 1116 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1117 for (; cp3 < cplim; cp3++) { 1118 if ((*cp++ ^ *cp2++) & *cp3) 1119 break; 1120 } 1121 if (cp3 == cplim) 1122 return ifa; 1123 } 1124 return ifa_maybe; 1125 } 1126 1127 /* 1128 * Default action when installing a route with a Link Level gateway. 1129 * Lookup an appropriate real ifa to point to. 1130 * This should be moved to /sys/net/link.c eventually. 1131 */ 1132 void 1133 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1134 { 1135 struct ifaddr *ifa; 1136 const struct sockaddr *dst; 1137 struct ifnet *ifp; 1138 1139 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) || 1140 ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_getkey(rt)) == NULL)) 1141 return; 1142 if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) { 1143 rt_replace_ifa(rt, ifa); 1144 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1145 ifa->ifa_rtrequest(cmd, rt, info); 1146 } 1147 } 1148 1149 /* 1150 * Handle a change in the interface link state. 1151 */ 1152 void 1153 if_link_state_change(struct ifnet *ifp, int link_state) 1154 { 1155 if (ifp->if_link_state == link_state) 1156 return; 1157 ifp->if_link_state = link_state; 1158 /* Notify that the link state has changed. */ 1159 rt_ifmsg(ifp); 1160 #if NCARP > 0 1161 if (ifp->if_carp) 1162 carp_carpdev_state(ifp); 1163 #endif 1164 } 1165 1166 /* 1167 * Mark an interface down and notify protocols of 1168 * the transition. 1169 * NOTE: must be called at splsoftnet or equivalent. 1170 */ 1171 void 1172 if_down(struct ifnet *ifp) 1173 { 1174 struct ifaddr *ifa; 1175 1176 ifp->if_flags &= ~IFF_UP; 1177 microtime(&ifp->if_lastchange); 1178 IFADDR_FOREACH(ifa, ifp) 1179 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1180 IFQ_PURGE(&ifp->if_snd); 1181 #if NCARP > 0 1182 if (ifp->if_carp) 1183 carp_carpdev_state(ifp); 1184 #endif 1185 rt_ifmsg(ifp); 1186 } 1187 1188 /* 1189 * Mark an interface up and notify protocols of 1190 * the transition. 1191 * NOTE: must be called at splsoftnet or equivalent. 1192 */ 1193 void 1194 if_up(struct ifnet *ifp) 1195 { 1196 #ifdef notyet 1197 struct ifaddr *ifa; 1198 #endif 1199 1200 ifp->if_flags |= IFF_UP; 1201 microtime(&ifp->if_lastchange); 1202 #ifdef notyet 1203 /* this has no effect on IP, and will kill all ISO connections XXX */ 1204 IFADDR_FOREACH(ifa, ifp) 1205 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1206 #endif 1207 #if NCARP > 0 1208 if (ifp->if_carp) 1209 carp_carpdev_state(ifp); 1210 #endif 1211 rt_ifmsg(ifp); 1212 #ifdef INET6 1213 in6_if_up(ifp); 1214 #endif 1215 } 1216 1217 /* 1218 * Handle interface watchdog timer routines. Called 1219 * from softclock, we decrement timers (if set) and 1220 * call the appropriate interface routine on expiration. 1221 */ 1222 void 1223 if_slowtimo(void *arg) 1224 { 1225 struct ifnet *ifp; 1226 int s = splnet(); 1227 1228 IFNET_FOREACH(ifp) { 1229 if (ifp->if_timer == 0 || --ifp->if_timer) 1230 continue; 1231 if (ifp->if_watchdog != NULL) 1232 (*ifp->if_watchdog)(ifp); 1233 } 1234 splx(s); 1235 callout_reset(&if_slowtimo_ch, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 1236 } 1237 1238 /* 1239 * Set/clear promiscuous mode on interface ifp based on the truth value 1240 * of pswitch. The calls are reference counted so that only the first 1241 * "on" request actually has an effect, as does the final "off" request. 1242 * Results are undefined if the "off" and "on" requests are not matched. 1243 */ 1244 int 1245 ifpromisc(struct ifnet *ifp, int pswitch) 1246 { 1247 int pcount, ret; 1248 short flags; 1249 struct ifreq ifr; 1250 1251 pcount = ifp->if_pcount; 1252 flags = ifp->if_flags; 1253 if (pswitch) { 1254 /* 1255 * Allow the device to be "placed" into promiscuous 1256 * mode even if it is not configured up. It will 1257 * consult IFF_PROMISC when it is is brought up. 1258 */ 1259 if (ifp->if_pcount++ != 0) 1260 return 0; 1261 ifp->if_flags |= IFF_PROMISC; 1262 if ((ifp->if_flags & IFF_UP) == 0) 1263 return 0; 1264 } else { 1265 if (--ifp->if_pcount > 0) 1266 return 0; 1267 ifp->if_flags &= ~IFF_PROMISC; 1268 /* 1269 * If the device is not configured up, we should not need to 1270 * turn off promiscuous mode (device should have turned it 1271 * off when interface went down; and will look at IFF_PROMISC 1272 * again next time interface comes up). 1273 */ 1274 if ((ifp->if_flags & IFF_UP) == 0) 1275 return 0; 1276 } 1277 memset(&ifr, 0, sizeof(ifr)); 1278 ifr.ifr_flags = ifp->if_flags; 1279 ret = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (void *) &ifr); 1280 /* Restore interface state if not successful. */ 1281 if (ret != 0) { 1282 ifp->if_pcount = pcount; 1283 ifp->if_flags = flags; 1284 } 1285 return ret; 1286 } 1287 1288 /* 1289 * Map interface name to 1290 * interface structure pointer. 1291 */ 1292 struct ifnet * 1293 ifunit(const char *name) 1294 { 1295 struct ifnet *ifp; 1296 const char *cp = name; 1297 u_int unit = 0; 1298 u_int i; 1299 1300 /* 1301 * If the entire name is a number, treat it as an ifindex. 1302 */ 1303 for (i = 0; i < IFNAMSIZ && *cp >= '0' && *cp <= '9'; i++, cp++) { 1304 unit = unit * 10 + (*cp - '0'); 1305 } 1306 1307 /* 1308 * If the number took all of the name, then it's a valid ifindex. 1309 */ 1310 if (i == IFNAMSIZ || (cp != name && *cp == '\0')) { 1311 if (unit >= if_indexlim) 1312 return NULL; 1313 ifp = ifindex2ifnet[unit]; 1314 if (ifp == NULL || ifp->if_output == if_nulloutput) 1315 return NULL; 1316 return ifp; 1317 } 1318 1319 IFNET_FOREACH(ifp) { 1320 if (ifp->if_output == if_nulloutput) 1321 continue; 1322 if (strcmp(ifp->if_xname, name) == 0) 1323 return ifp; 1324 } 1325 return NULL; 1326 } 1327 1328 /* 1329 * Interface ioctls. 1330 */ 1331 int 1332 ifioctl(struct socket *so, u_long cmd, void *data, struct lwp *l) 1333 { 1334 struct ifnet *ifp; 1335 struct ifreq *ifr; 1336 struct ifcapreq *ifcr; 1337 struct ifdatareq *ifdr; 1338 int s, error = 0; 1339 #if defined(COMPAT_OSOCK) || defined(COMPAT_OIFREQ) 1340 u_long ocmd = cmd; 1341 #endif 1342 short oif_flags; 1343 #ifdef COMPAT_OIFREQ 1344 struct ifreq ifrb; 1345 struct oifreq *oifr = NULL; 1346 #endif 1347 1348 switch (cmd) { 1349 #ifdef COMPAT_OIFREQ 1350 case OSIOCGIFCONF: 1351 case OOSIOCGIFCONF: 1352 return compat_ifconf(cmd, data); 1353 #endif 1354 case SIOCGIFCONF: 1355 return ifconf(cmd, data); 1356 } 1357 1358 #ifdef COMPAT_OIFREQ 1359 cmd = compat_cvtcmd(cmd); 1360 if (cmd != ocmd) { 1361 oifr = data; 1362 data = ifr = &ifrb; 1363 ifreqo2n(oifr, ifr); 1364 } else 1365 #endif 1366 ifr = data; 1367 ifcr = data; 1368 ifdr = data; 1369 1370 ifp = ifunit(ifr->ifr_name); 1371 1372 switch (cmd) { 1373 case SIOCIFCREATE: 1374 case SIOCIFDESTROY: 1375 if (l != NULL) { 1376 error = kauth_authorize_network(l->l_cred, 1377 KAUTH_NETWORK_INTERFACE, 1378 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1379 (void *)cmd, NULL); 1380 if (error != 0) 1381 return error; 1382 } 1383 return (cmd == SIOCIFCREATE) ? 1384 if_clone_create(ifr->ifr_name) : 1385 if_clone_destroy(ifr->ifr_name); 1386 1387 case SIOCIFGCLONERS: 1388 return if_clone_list((struct if_clonereq *)data); 1389 } 1390 1391 if (ifp == NULL) 1392 return ENXIO; 1393 1394 switch (cmd) { 1395 case SIOCSIFFLAGS: 1396 case SIOCSIFCAP: 1397 case SIOCSIFMETRIC: 1398 case SIOCZIFDATA: 1399 case SIOCSIFMTU: 1400 case SIOCSIFPHYADDR: 1401 case SIOCDIFPHYADDR: 1402 #ifdef INET6 1403 case SIOCSIFPHYADDR_IN6: 1404 #endif 1405 case SIOCSLIFPHYADDR: 1406 case SIOCADDMULTI: 1407 case SIOCDELMULTI: 1408 case SIOCSIFMEDIA: 1409 case SIOCSDRVSPEC: 1410 case SIOCG80211: 1411 case SIOCS80211: 1412 case SIOCS80211NWID: 1413 case SIOCS80211NWKEY: 1414 case SIOCS80211POWER: 1415 case SIOCS80211BSSID: 1416 case SIOCS80211CHANNEL: 1417 if (l != NULL) { 1418 error = kauth_authorize_network(l->l_cred, 1419 KAUTH_NETWORK_INTERFACE, 1420 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1421 (void *)cmd, NULL); 1422 if (error != 0) 1423 return error; 1424 } 1425 } 1426 1427 oif_flags = ifp->if_flags; 1428 switch (cmd) { 1429 1430 case SIOCGIFFLAGS: 1431 ifr->ifr_flags = ifp->if_flags; 1432 break; 1433 1434 case SIOCGIFMETRIC: 1435 ifr->ifr_metric = ifp->if_metric; 1436 break; 1437 1438 case SIOCGIFMTU: 1439 ifr->ifr_mtu = ifp->if_mtu; 1440 break; 1441 1442 case SIOCGIFDLT: 1443 ifr->ifr_dlt = ifp->if_dlt; 1444 break; 1445 1446 case SIOCSIFFLAGS: 1447 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 1448 s = splnet(); 1449 if_down(ifp); 1450 splx(s); 1451 } 1452 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { 1453 s = splnet(); 1454 if_up(ifp); 1455 splx(s); 1456 } 1457 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1458 (ifr->ifr_flags &~ IFF_CANTCHANGE); 1459 if (ifp->if_ioctl) 1460 (void)(*ifp->if_ioctl)(ifp, cmd, data); 1461 break; 1462 1463 case SIOCGIFCAP: 1464 ifcr->ifcr_capabilities = ifp->if_capabilities; 1465 ifcr->ifcr_capenable = ifp->if_capenable; 1466 break; 1467 1468 case SIOCSIFCAP: 1469 if ((ifcr->ifcr_capenable & ~ifp->if_capabilities) != 0) 1470 return EINVAL; 1471 if (ifp->if_ioctl == NULL) 1472 return EOPNOTSUPP; 1473 1474 /* Must prevent race with packet reception here. */ 1475 s = splnet(); 1476 if (ifcr->ifcr_capenable != ifp->if_capenable) { 1477 struct ifreq ifrq; 1478 1479 ifrq.ifr_flags = ifp->if_flags; 1480 ifp->if_capenable = ifcr->ifcr_capenable; 1481 1482 /* Pre-compute the checksum flags mask. */ 1483 ifp->if_csum_flags_tx = 0; 1484 ifp->if_csum_flags_rx = 0; 1485 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Tx) { 1486 ifp->if_csum_flags_tx |= M_CSUM_IPv4; 1487 } 1488 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Rx) { 1489 ifp->if_csum_flags_rx |= M_CSUM_IPv4; 1490 } 1491 1492 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Tx) { 1493 ifp->if_csum_flags_tx |= M_CSUM_TCPv4; 1494 } 1495 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Rx) { 1496 ifp->if_csum_flags_rx |= M_CSUM_TCPv4; 1497 } 1498 1499 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Tx) { 1500 ifp->if_csum_flags_tx |= M_CSUM_UDPv4; 1501 } 1502 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Rx) { 1503 ifp->if_csum_flags_rx |= M_CSUM_UDPv4; 1504 } 1505 1506 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Tx) { 1507 ifp->if_csum_flags_tx |= M_CSUM_TCPv6; 1508 } 1509 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Rx) { 1510 ifp->if_csum_flags_rx |= M_CSUM_TCPv6; 1511 } 1512 1513 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Tx) { 1514 ifp->if_csum_flags_tx |= M_CSUM_UDPv6; 1515 } 1516 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Rx) { 1517 ifp->if_csum_flags_rx |= M_CSUM_UDPv6; 1518 } 1519 1520 /* 1521 * Only kick the interface if it's up. If it's 1522 * not up now, it will notice the cap enables 1523 * when it is brought up later. 1524 */ 1525 if (ifp->if_flags & IFF_UP) 1526 (void)(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, 1527 (void *)&ifrq); 1528 } 1529 splx(s); 1530 break; 1531 1532 case SIOCSIFMETRIC: 1533 ifp->if_metric = ifr->ifr_metric; 1534 break; 1535 1536 case SIOCGIFDATA: 1537 ifdr->ifdr_data = ifp->if_data; 1538 break; 1539 1540 case SIOCZIFDATA: 1541 ifdr->ifdr_data = ifp->if_data; 1542 /* 1543 * Assumes that the volatile counters that can be 1544 * zero'ed are at the end of if_data. 1545 */ 1546 memset(&ifp->if_data.ifi_ipackets, 0, sizeof(ifp->if_data) - 1547 offsetof(struct if_data, ifi_ipackets)); 1548 break; 1549 1550 case SIOCSIFMTU: 1551 { 1552 u_long oldmtu = ifp->if_mtu; 1553 1554 if (ifp->if_ioctl == NULL) 1555 return EOPNOTSUPP; 1556 error = (*ifp->if_ioctl)(ifp, cmd, data); 1557 1558 /* 1559 * If the link MTU changed, do network layer specific procedure. 1560 */ 1561 if (ifp->if_mtu != oldmtu) { 1562 #ifdef INET6 1563 nd6_setmtu(ifp); 1564 #endif 1565 } 1566 break; 1567 } 1568 case SIOCSIFPHYADDR: 1569 case SIOCDIFPHYADDR: 1570 #ifdef INET6 1571 case SIOCSIFPHYADDR_IN6: 1572 #endif 1573 case SIOCSLIFPHYADDR: 1574 case SIOCADDMULTI: 1575 case SIOCDELMULTI: 1576 case SIOCSIFMEDIA: 1577 case SIOCGIFPSRCADDR: 1578 case SIOCGIFPDSTADDR: 1579 case SIOCGLIFPHYADDR: 1580 case SIOCGIFMEDIA: 1581 case SIOCG80211: 1582 case SIOCS80211: 1583 case SIOCS80211NWID: 1584 case SIOCS80211NWKEY: 1585 case SIOCS80211POWER: 1586 case SIOCS80211BSSID: 1587 case SIOCS80211CHANNEL: 1588 if (ifp->if_ioctl == NULL) 1589 return EOPNOTSUPP; 1590 error = (*ifp->if_ioctl)(ifp, cmd, data); 1591 break; 1592 1593 case SIOCSDRVSPEC: 1594 default: 1595 if (so->so_proto == NULL) 1596 return EOPNOTSUPP; 1597 #ifdef COMPAT_OSOCK 1598 error = compat_ifioctl(so, ocmd, cmd, data, l); 1599 #else 1600 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 1601 (struct mbuf *)cmd, (struct mbuf *)data, 1602 (struct mbuf *)ifp, l)); 1603 #endif 1604 break; 1605 } 1606 1607 if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) { 1608 #ifdef INET6 1609 if ((ifp->if_flags & IFF_UP) != 0) { 1610 s = splnet(); 1611 in6_if_up(ifp); 1612 splx(s); 1613 } 1614 #endif 1615 } 1616 #ifdef COMPAT_OIFREQ 1617 if (cmd != ocmd) 1618 ifreqn2o(oifr, ifr); 1619 #endif 1620 1621 return error; 1622 } 1623 1624 /* 1625 * Return interface configuration 1626 * of system. List may be used 1627 * in later ioctl's (above) to get 1628 * other information. 1629 * 1630 * Each record is a struct ifreq. Before the addition of 1631 * sockaddr_storage, the API rule was that sockaddr flavors that did 1632 * not fit would extend beyond the struct ifreq, with the next struct 1633 * ifreq starting sa_len beyond the struct sockaddr. Because the 1634 * union in struct ifreq includes struct sockaddr_storage, every kind 1635 * of sockaddr must fit. Thus, there are no longer any overlength 1636 * records. 1637 * 1638 * Records are added to the user buffer if they fit, and ifc_len is 1639 * adjusted to the length that was written. Thus, the user is only 1640 * assured of getting the complete list if ifc_len on return is at 1641 * least sizeof(struct ifreq) less than it was on entry. 1642 * 1643 * If the user buffer pointer is NULL, this routine copies no data and 1644 * returns the amount of space that would be needed. 1645 * 1646 * Invariants: 1647 * ifrp points to the next part of the user's buffer to be used. If 1648 * ifrp != NULL, space holds the number of bytes remaining that we may 1649 * write at ifrp. Otherwise, space holds the number of bytes that 1650 * would have been written had there been adequate space. 1651 */ 1652 /*ARGSUSED*/ 1653 int 1654 ifconf(u_long cmd, void *data) 1655 { 1656 struct ifconf *ifc = (struct ifconf *)data; 1657 struct ifnet *ifp; 1658 struct ifaddr *ifa; 1659 struct ifreq ifr, *ifrp; 1660 int space, error = 0; 1661 const int sz = (int)sizeof(struct ifreq); 1662 1663 if ((ifrp = ifc->ifc_req) == NULL) 1664 space = 0; 1665 else 1666 space = ifc->ifc_len; 1667 IFNET_FOREACH(ifp) { 1668 (void)strncpy(ifr.ifr_name, ifp->if_xname, 1669 sizeof(ifr.ifr_name)); 1670 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') 1671 return ENAMETOOLONG; 1672 if (IFADDR_EMPTY(ifp)) { 1673 /* Interface with no addresses - send zero sockaddr. */ 1674 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr)); 1675 if (ifrp != NULL) 1676 { 1677 if (space >= sz) { 1678 error = copyout(&ifr, ifrp, sz); 1679 if (error != 0) 1680 return (error); 1681 ifrp++; space -= sz; 1682 } 1683 } 1684 else 1685 space += sz; 1686 continue; 1687 } 1688 1689 IFADDR_FOREACH(ifa, ifp) { 1690 struct sockaddr *sa = ifa->ifa_addr; 1691 /* all sockaddrs must fit in sockaddr_storage */ 1692 KASSERT(sa->sa_len <= sizeof(ifr.ifr_ifru)); 1693 1694 if (ifrp != NULL) 1695 { 1696 memcpy(&ifr.ifr_space, sa, sa->sa_len); 1697 if (space >= sz) { 1698 error = copyout(&ifr, ifrp, sz); 1699 if (error != 0) 1700 return (error); 1701 ifrp++; space -= sz; 1702 } 1703 } 1704 else 1705 space += sz; 1706 } 1707 } 1708 if (ifrp != NULL) 1709 { 1710 KASSERT(0 <= space && space <= ifc->ifc_len); 1711 ifc->ifc_len -= space; 1712 } 1713 else 1714 { 1715 KASSERT(space >= 0); 1716 ifc->ifc_len = space; 1717 } 1718 return (0); 1719 } 1720 1721 int 1722 ifreq_setaddr(const u_long cmd, struct ifreq *ifr, const struct sockaddr *sa) 1723 { 1724 uint8_t len; 1725 u_long ncmd; 1726 const uint8_t osockspace = sizeof(ifr->ifr_addr); 1727 const uint8_t sockspace = sizeof(ifr->ifr_ifru.ifru_space); 1728 1729 #ifdef INET6 1730 if (cmd == SIOCGIFPSRCADDR_IN6 || cmd == SIOCGIFPDSTADDR_IN6) 1731 len = MIN(sizeof(struct sockaddr_in6), sa->sa_len); 1732 else 1733 #endif /* INET6 */ 1734 if ((ncmd = compat_cvtcmd(cmd)) != cmd) 1735 len = MIN(osockspace, sa->sa_len); 1736 else 1737 len = MIN(sockspace, sa->sa_len); 1738 if (len < sa->sa_len) 1739 return EFBIG; 1740 sockaddr_copy(&ifr->ifr_addr, len, sa); 1741 return 0; 1742 } 1743 1744 /* 1745 * Queue message on interface, and start output if interface 1746 * not yet active. 1747 */ 1748 int 1749 ifq_enqueue(struct ifnet *ifp, struct mbuf *m 1750 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 1751 { 1752 int len = m->m_pkthdr.len; 1753 int mflags = m->m_flags; 1754 int s = splnet(); 1755 int error; 1756 1757 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 1758 if (error != 0) 1759 goto out; 1760 ifp->if_obytes += len; 1761 if (mflags & M_MCAST) 1762 ifp->if_omcasts++; 1763 if ((ifp->if_flags & IFF_OACTIVE) == 0) 1764 (*ifp->if_start)(ifp); 1765 out: 1766 splx(s); 1767 return error; 1768 } 1769 1770 /* 1771 * Queue message on interface, possibly using a second fast queue 1772 */ 1773 int 1774 ifq_enqueue2(struct ifnet *ifp, struct ifqueue *ifq, struct mbuf *m 1775 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 1776 { 1777 int error = 0; 1778 1779 if (ifq != NULL 1780 #ifdef ALTQ 1781 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 1782 #endif 1783 ) { 1784 if (IF_QFULL(ifq)) { 1785 IF_DROP(&ifp->if_snd); 1786 m_freem(m); 1787 if (error == 0) 1788 error = ENOBUFS; 1789 } else 1790 IF_ENQUEUE(ifq, m); 1791 } else 1792 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 1793 if (error != 0) { 1794 ++ifp->if_oerrors; 1795 return error; 1796 } 1797 return 0; 1798 } 1799 1800 1801 #if defined(INET) || defined(INET6) 1802 static void 1803 sysctl_net_ifq_setup(struct sysctllog **clog, 1804 int pf, const char *pfname, 1805 int ipn, const char *ipname, 1806 int qid, struct ifqueue *ifq) 1807 { 1808 1809 sysctl_createv(clog, 0, NULL, NULL, 1810 CTLFLAG_PERMANENT, 1811 CTLTYPE_NODE, "net", NULL, 1812 NULL, 0, NULL, 0, 1813 CTL_NET, CTL_EOL); 1814 sysctl_createv(clog, 0, NULL, NULL, 1815 CTLFLAG_PERMANENT, 1816 CTLTYPE_NODE, pfname, NULL, 1817 NULL, 0, NULL, 0, 1818 CTL_NET, pf, CTL_EOL); 1819 sysctl_createv(clog, 0, NULL, NULL, 1820 CTLFLAG_PERMANENT, 1821 CTLTYPE_NODE, ipname, NULL, 1822 NULL, 0, NULL, 0, 1823 CTL_NET, pf, ipn, CTL_EOL); 1824 sysctl_createv(clog, 0, NULL, NULL, 1825 CTLFLAG_PERMANENT, 1826 CTLTYPE_NODE, "ifq", 1827 SYSCTL_DESCR("Protocol input queue controls"), 1828 NULL, 0, NULL, 0, 1829 CTL_NET, pf, ipn, qid, CTL_EOL); 1830 1831 sysctl_createv(clog, 0, NULL, NULL, 1832 CTLFLAG_PERMANENT, 1833 CTLTYPE_INT, "len", 1834 SYSCTL_DESCR("Current input queue length"), 1835 NULL, 0, &ifq->ifq_len, 0, 1836 CTL_NET, pf, ipn, qid, IFQCTL_LEN, CTL_EOL); 1837 sysctl_createv(clog, 0, NULL, NULL, 1838 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1839 CTLTYPE_INT, "maxlen", 1840 SYSCTL_DESCR("Maximum allowed input queue length"), 1841 NULL, 0, &ifq->ifq_maxlen, 0, 1842 CTL_NET, pf, ipn, qid, IFQCTL_MAXLEN, CTL_EOL); 1843 #ifdef notyet 1844 sysctl_createv(clog, 0, NULL, NULL, 1845 CTLFLAG_PERMANENT, 1846 CTLTYPE_INT, "peak", 1847 SYSCTL_DESCR("Highest input queue length"), 1848 NULL, 0, &ifq->ifq_peak, 0, 1849 CTL_NET, pf, ipn, qid, IFQCTL_PEAK, CTL_EOL); 1850 #endif 1851 sysctl_createv(clog, 0, NULL, NULL, 1852 CTLFLAG_PERMANENT, 1853 CTLTYPE_INT, "drops", 1854 SYSCTL_DESCR("Packets dropped due to full input queue"), 1855 NULL, 0, &ifq->ifq_drops, 0, 1856 CTL_NET, pf, ipn, qid, IFQCTL_DROPS, CTL_EOL); 1857 } 1858 1859 #ifdef INET 1860 SYSCTL_SETUP(sysctl_net_inet_ip_ifq_setup, 1861 "sysctl net.inet.ip.ifq subtree setup") 1862 { 1863 extern struct ifqueue ipintrq; 1864 1865 sysctl_net_ifq_setup(clog, PF_INET, "inet", IPPROTO_IP, "ip", 1866 IPCTL_IFQ, &ipintrq); 1867 } 1868 #endif /* INET */ 1869 1870 #ifdef INET6 1871 SYSCTL_SETUP(sysctl_net_inet6_ip6_ifq_setup, 1872 "sysctl net.inet6.ip6.ifq subtree setup") 1873 { 1874 extern struct ifqueue ip6intrq; 1875 1876 sysctl_net_ifq_setup(clog, PF_INET6, "inet6", IPPROTO_IPV6, "ip6", 1877 IPV6CTL_IFQ, &ip6intrq); 1878 } 1879 #endif /* INET6 */ 1880 #endif /* INET || INET6 */ 1881