if.c revision 1.209
1 /* $NetBSD: if.c,v 1.209 2007/12/20 19:53:30 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 1.209 2007/12/20 19:53:30 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 ifp->if_dl = ifa; 304 IFAREF(ifa); 305 ifa->ifa_rtrequest = link_rtrequest; 306 ifa->ifa_addr = (struct sockaddr *)sdl; 307 ifp->if_sadl = sdl; 308 ifa->ifa_netmask = (struct sockaddr *)mask; 309 } 310 311 /* 312 * Free the link level name for the specified interface. This is 313 * a detach helper. This is called from if_detach() or from 314 * link layer type specific detach functions. 315 */ 316 void 317 if_free_sadl(struct ifnet *ifp) 318 { 319 struct ifaddr *ifa; 320 int s; 321 322 ifa = ifnet_addrs[ifp->if_index]; 323 if (ifa == NULL) { 324 KASSERT(ifp->if_sadl == NULL); 325 KASSERT(ifp->if_dl == NULL); 326 return; 327 } 328 329 KASSERT(ifp->if_sadl != NULL); 330 KASSERT(ifp->if_dl != NULL); 331 332 s = splnet(); 333 rtinit(ifa, RTM_DELETE, 0); 334 ifa_remove(ifp, ifa); 335 336 ifp->if_sadl = NULL; 337 338 ifnet_addrs[ifp->if_index] = NULL; 339 IFAFREE(ifa); 340 ifp->if_dl = NULL; 341 IFAFREE(ifa); 342 splx(s); 343 } 344 345 /* 346 * Attach an interface to the 347 * list of "active" interfaces. 348 */ 349 void 350 if_attach(struct ifnet *ifp) 351 { 352 int indexlim = 0; 353 354 if (if_indexlim == 0) { 355 TAILQ_INIT(&ifnet); 356 if_indexlim = 8; 357 } 358 TAILQ_INIT(&ifp->if_addrlist); 359 TAILQ_INSERT_TAIL(&ifnet, ifp, if_list); 360 ifp->if_index = if_index; 361 if (ifindex2ifnet == NULL) 362 if_index++; 363 else 364 while (ifp->if_index < if_indexlim && 365 ifindex2ifnet[ifp->if_index] != NULL) { 366 ++if_index; 367 if (if_index == 0) 368 if_index = 1; 369 /* 370 * If we hit USHRT_MAX, we skip back to 0 since 371 * there are a number of places where the value 372 * of if_index or if_index itself is compared 373 * to or stored in an unsigned short. By 374 * jumping back, we won't botch those assignments 375 * or comparisons. 376 */ 377 else if (if_index == USHRT_MAX) { 378 /* 379 * However, if we have to jump back to 380 * zero *twice* without finding an empty 381 * slot in ifindex2ifnet[], then there 382 * there are too many (>65535) interfaces. 383 */ 384 if (indexlim++) 385 panic("too many interfaces"); 386 else 387 if_index = 1; 388 } 389 ifp->if_index = if_index; 390 } 391 392 /* 393 * We have some arrays that should be indexed by if_index. 394 * since if_index will grow dynamically, they should grow too. 395 * struct ifadd **ifnet_addrs 396 * struct ifnet **ifindex2ifnet 397 */ 398 if (ifnet_addrs == NULL || ifindex2ifnet == NULL || 399 ifp->if_index >= if_indexlim) { 400 size_t m, n, oldlim; 401 void *q; 402 403 oldlim = if_indexlim; 404 while (ifp->if_index >= if_indexlim) 405 if_indexlim <<= 1; 406 407 /* grow ifnet_addrs */ 408 m = oldlim * sizeof(struct ifaddr *); 409 n = if_indexlim * sizeof(struct ifaddr *); 410 q = (void *)malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 411 if (ifnet_addrs != NULL) { 412 memcpy(q, ifnet_addrs, m); 413 free((void *)ifnet_addrs, M_IFADDR); 414 } 415 ifnet_addrs = (struct ifaddr **)q; 416 417 /* grow ifindex2ifnet */ 418 m = oldlim * sizeof(struct ifnet *); 419 n = if_indexlim * sizeof(struct ifnet *); 420 q = (void *)malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 421 if (ifindex2ifnet != NULL) { 422 memcpy(q, (void *)ifindex2ifnet, m); 423 free((void *)ifindex2ifnet, M_IFADDR); 424 } 425 ifindex2ifnet = (struct ifnet **)q; 426 } 427 428 ifindex2ifnet[ifp->if_index] = ifp; 429 430 /* 431 * Link level name is allocated later by a separate call to 432 * if_alloc_sadl(). 433 */ 434 435 if (ifp->if_snd.ifq_maxlen == 0) 436 ifp->if_snd.ifq_maxlen = ifqmaxlen; 437 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 438 439 ifp->if_link_state = LINK_STATE_UNKNOWN; 440 441 ifp->if_capenable = 0; 442 ifp->if_csum_flags_tx = 0; 443 ifp->if_csum_flags_rx = 0; 444 445 #ifdef ALTQ 446 ifp->if_snd.altq_type = 0; 447 ifp->if_snd.altq_disc = NULL; 448 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 449 ifp->if_snd.altq_tbr = NULL; 450 ifp->if_snd.altq_ifp = ifp; 451 #endif 452 453 #ifdef PFIL_HOOKS 454 ifp->if_pfil.ph_type = PFIL_TYPE_IFNET; 455 ifp->if_pfil.ph_ifnet = ifp; 456 if (pfil_head_register(&ifp->if_pfil) != 0) 457 printf("%s: WARNING: unable to register pfil hook\n", 458 ifp->if_xname); 459 (void)pfil_run_hooks(&if_pfil, 460 (struct mbuf **)PFIL_IFNET_ATTACH, ifp, PFIL_IFNET); 461 #endif 462 463 if (!STAILQ_EMPTY(&domains)) 464 if_attachdomain1(ifp); 465 466 /* Announce the interface. */ 467 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 468 } 469 470 void 471 if_attachdomain(void) 472 { 473 struct ifnet *ifp; 474 int s; 475 476 s = splnet(); 477 IFNET_FOREACH(ifp) 478 if_attachdomain1(ifp); 479 splx(s); 480 } 481 482 void 483 if_attachdomain1(struct ifnet *ifp) 484 { 485 struct domain *dp; 486 int s; 487 488 s = splnet(); 489 490 /* address family dependent data region */ 491 memset(ifp->if_afdata, 0, sizeof(ifp->if_afdata)); 492 DOMAIN_FOREACH(dp) { 493 if (dp->dom_ifattach != NULL) 494 ifp->if_afdata[dp->dom_family] = 495 (*dp->dom_ifattach)(ifp); 496 } 497 498 splx(s); 499 } 500 501 /* 502 * Deactivate an interface. This points all of the procedure 503 * handles at error stubs. May be called from interrupt context. 504 */ 505 void 506 if_deactivate(struct ifnet *ifp) 507 { 508 int s; 509 510 s = splnet(); 511 512 ifp->if_output = if_nulloutput; 513 ifp->if_input = if_nullinput; 514 ifp->if_start = if_nullstart; 515 ifp->if_ioctl = if_nullioctl; 516 ifp->if_init = if_nullinit; 517 ifp->if_stop = if_nullstop; 518 ifp->if_watchdog = if_nullwatchdog; 519 ifp->if_drain = if_nulldrain; 520 521 /* No more packets may be enqueued. */ 522 ifp->if_snd.ifq_maxlen = 0; 523 524 splx(s); 525 } 526 527 void 528 if_purgeaddrs(struct ifnet *ifp, int family, 529 void (*purgeaddr)(struct ifaddr *)) 530 { 531 struct ifaddr *ifa, *nifa; 532 533 for (ifa = IFADDR_FIRST(ifp); ifa != NULL; ifa = nifa) { 534 nifa = IFADDR_NEXT(ifa); 535 if (ifa->ifa_addr->sa_family != family) 536 continue; 537 (*purgeaddr)(ifa); 538 } 539 } 540 541 /* 542 * Detach an interface from the list of "active" interfaces, 543 * freeing any resources as we go along. 544 * 545 * NOTE: This routine must be called with a valid thread context, 546 * as it may block. 547 */ 548 void 549 if_detach(struct ifnet *ifp) 550 { 551 struct socket so; 552 struct ifaddr *ifa; 553 #ifdef IFAREF_DEBUG 554 struct ifaddr *last_ifa = NULL; 555 #endif 556 struct domain *dp; 557 const struct protosw *pr; 558 int s, i, family, purged; 559 560 /* 561 * XXX It's kind of lame that we have to have the 562 * XXX socket structure... 563 */ 564 memset(&so, 0, sizeof(so)); 565 566 s = splnet(); 567 568 /* 569 * Do an if_down() to give protocols a chance to do something. 570 */ 571 if_down(ifp); 572 573 #ifdef ALTQ 574 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 575 altq_disable(&ifp->if_snd); 576 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 577 altq_detach(&ifp->if_snd); 578 #endif 579 580 581 #if NCARP > 0 582 /* Remove the interface from any carp group it is a part of. */ 583 if (ifp->if_carp != NULL && ifp->if_type != IFT_CARP) 584 carp_ifdetach(ifp); 585 #endif 586 587 /* 588 * Rip all the addresses off the interface. This should make 589 * all of the routes go away. 590 * 591 * pr_usrreq calls can remove an arbitrary number of ifaddrs 592 * from the list, including our "cursor", ifa. For safety, 593 * and to honor the TAILQ abstraction, I just restart the 594 * loop after each removal. Note that the loop will exit 595 * when all of the remaining ifaddrs belong to the AF_LINK 596 * family. I am counting on the historical fact that at 597 * least one pr_usrreq in each address domain removes at 598 * least one ifaddr. 599 */ 600 again: 601 IFADDR_FOREACH(ifa, ifp) { 602 family = ifa->ifa_addr->sa_family; 603 #ifdef IFAREF_DEBUG 604 printf("if_detach: ifaddr %p, family %d, refcnt %d\n", 605 ifa, family, ifa->ifa_refcnt); 606 if (last_ifa != NULL && ifa == last_ifa) 607 panic("if_detach: loop detected"); 608 last_ifa = ifa; 609 #endif 610 if (family == AF_LINK) 611 continue; 612 dp = pffinddomain(family); 613 #ifdef DIAGNOSTIC 614 if (dp == NULL) 615 panic("if_detach: no domain for AF %d", 616 family); 617 #endif 618 /* 619 * XXX These PURGEIF calls are redundant with the 620 * purge-all-families calls below, but are left in for 621 * now both to make a smaller change, and to avoid 622 * unplanned interactions with clearing of 623 * ifp->if_addrlist. 624 */ 625 purged = 0; 626 for (pr = dp->dom_protosw; 627 pr < dp->dom_protoswNPROTOSW; pr++) { 628 so.so_proto = pr; 629 if (pr->pr_usrreq != NULL) { 630 (void) (*pr->pr_usrreq)(&so, 631 PRU_PURGEIF, NULL, NULL, 632 (struct mbuf *) ifp, curlwp); 633 purged = 1; 634 } 635 } 636 if (purged == 0) { 637 /* 638 * XXX What's really the best thing to do 639 * XXX here? --thorpej (at) NetBSD.org 640 */ 641 printf("if_detach: WARNING: AF %d not purged\n", 642 family); 643 ifa_remove(ifp, ifa); 644 } 645 goto again; 646 } 647 648 if_free_sadl(ifp); 649 650 /* Walk the routing table looking for stragglers. */ 651 for (i = 0; i <= AF_MAX; i++) 652 (void)rt_walktree(i, if_rt_walktree, ifp); 653 654 DOMAIN_FOREACH(dp) { 655 if (dp->dom_ifdetach != NULL && ifp->if_afdata[dp->dom_family]) 656 (*dp->dom_ifdetach)(ifp, 657 ifp->if_afdata[dp->dom_family]); 658 659 /* 660 * One would expect multicast memberships (INET and 661 * INET6) on UDP sockets to be purged by the PURGEIF 662 * calls above, but if all addresses were removed from 663 * the interface prior to destruction, the calls will 664 * not be made (e.g. ppp, for which pppd(8) generally 665 * removes addresses before destroying the interface). 666 * Because there is no invariant that multicast 667 * memberships only exist for interfaces with IPv4 668 * addresses, we must call PURGEIF regardless of 669 * addresses. (Protocols which might store ifnet 670 * pointers are marked with PR_PURGEIF.) 671 */ 672 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 673 so.so_proto = pr; 674 if (pr->pr_usrreq != NULL && pr->pr_flags & PR_PURGEIF) 675 (void)(*pr->pr_usrreq)(&so, PRU_PURGEIF, NULL, 676 NULL, (struct mbuf *)ifp, curlwp); 677 } 678 } 679 680 #ifdef PFIL_HOOKS 681 (void)pfil_run_hooks(&if_pfil, 682 (struct mbuf **)PFIL_IFNET_DETACH, ifp, PFIL_IFNET); 683 (void)pfil_head_unregister(&ifp->if_pfil); 684 #endif 685 686 /* Announce that the interface is gone. */ 687 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 688 689 ifindex2ifnet[ifp->if_index] = NULL; 690 691 TAILQ_REMOVE(&ifnet, ifp, if_list); 692 693 /* 694 * remove packets that came from ifp, from software interrupt queues. 695 */ 696 DOMAIN_FOREACH(dp) { 697 for (i = 0; i < __arraycount(dp->dom_ifqueues); i++) { 698 if (dp->dom_ifqueues[i] == NULL) 699 break; 700 if_detach_queues(ifp, dp->dom_ifqueues[i]); 701 } 702 } 703 704 splx(s); 705 } 706 707 static void 708 if_detach_queues(struct ifnet *ifp, struct ifqueue *q) 709 { 710 struct mbuf *m, *prev, *next; 711 712 prev = NULL; 713 for (m = q->ifq_head; m != NULL; m = next) { 714 next = m->m_nextpkt; 715 #ifdef DIAGNOSTIC 716 if ((m->m_flags & M_PKTHDR) == 0) { 717 prev = m; 718 continue; 719 } 720 #endif 721 if (m->m_pkthdr.rcvif != ifp) { 722 prev = m; 723 continue; 724 } 725 726 if (prev != NULL) 727 prev->m_nextpkt = m->m_nextpkt; 728 else 729 q->ifq_head = m->m_nextpkt; 730 if (q->ifq_tail == m) 731 q->ifq_tail = prev; 732 q->ifq_len--; 733 734 m->m_nextpkt = NULL; 735 m_freem(m); 736 IF_DROP(q); 737 } 738 } 739 740 /* 741 * Callback for a radix tree walk to delete all references to an 742 * ifnet. 743 */ 744 static int 745 if_rt_walktree(struct rtentry *rt, void *v) 746 { 747 struct ifnet *ifp = (struct ifnet *)v; 748 int error; 749 750 if (rt->rt_ifp != ifp) 751 return 0; 752 753 /* Delete the entry. */ 754 ++rt->rt_refcnt; 755 error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway, 756 rt_mask(rt), rt->rt_flags, NULL); 757 KASSERT((rt->rt_flags & RTF_UP) == 0); 758 rt->rt_ifp = NULL; 759 RTFREE(rt); 760 if (error != 0) 761 printf("%s: warning: unable to delete rtentry @ %p, " 762 "error = %d\n", ifp->if_xname, rt, error); 763 return 0; 764 } 765 766 /* 767 * Create a clone network interface. 768 */ 769 int 770 if_clone_create(const char *name) 771 { 772 struct if_clone *ifc; 773 int unit; 774 775 ifc = if_clone_lookup(name, &unit); 776 if (ifc == NULL) 777 return EINVAL; 778 779 if (ifunit(name) != NULL) 780 return EEXIST; 781 782 return (*ifc->ifc_create)(ifc, unit); 783 } 784 785 /* 786 * Destroy a clone network interface. 787 */ 788 int 789 if_clone_destroy(const char *name) 790 { 791 struct if_clone *ifc; 792 struct ifnet *ifp; 793 794 ifc = if_clone_lookup(name, NULL); 795 if (ifc == NULL) 796 return EINVAL; 797 798 ifp = ifunit(name); 799 if (ifp == NULL) 800 return ENXIO; 801 802 if (ifc->ifc_destroy == NULL) 803 return EOPNOTSUPP; 804 805 return (*ifc->ifc_destroy)(ifp); 806 } 807 808 /* 809 * Look up a network interface cloner. 810 */ 811 static struct if_clone * 812 if_clone_lookup(const char *name, int *unitp) 813 { 814 struct if_clone *ifc; 815 const char *cp; 816 int unit; 817 818 /* separate interface name from unit */ 819 for (cp = name; 820 cp - name < IFNAMSIZ && *cp && (*cp < '0' || *cp > '9'); 821 cp++) 822 continue; 823 824 if (cp == name || cp - name == IFNAMSIZ || !*cp) 825 return NULL; /* No name or unit number */ 826 827 LIST_FOREACH(ifc, &if_cloners, ifc_list) { 828 if (strlen(ifc->ifc_name) == cp - name && 829 strncmp(name, ifc->ifc_name, cp - name) == 0) 830 break; 831 } 832 833 if (ifc == NULL) 834 return NULL; 835 836 unit = 0; 837 while (cp - name < IFNAMSIZ && *cp) { 838 if (*cp < '0' || *cp > '9' || unit > INT_MAX / 10) { 839 /* Bogus unit number. */ 840 return NULL; 841 } 842 unit = (unit * 10) + (*cp++ - '0'); 843 } 844 845 if (unitp != NULL) 846 *unitp = unit; 847 return ifc; 848 } 849 850 /* 851 * Register a network interface cloner. 852 */ 853 void 854 if_clone_attach(struct if_clone *ifc) 855 { 856 857 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 858 if_cloners_count++; 859 } 860 861 /* 862 * Unregister a network interface cloner. 863 */ 864 void 865 if_clone_detach(struct if_clone *ifc) 866 { 867 868 LIST_REMOVE(ifc, ifc_list); 869 if_cloners_count--; 870 } 871 872 /* 873 * Provide list of interface cloners to userspace. 874 */ 875 static int 876 if_clone_list(struct if_clonereq *ifcr) 877 { 878 char outbuf[IFNAMSIZ], *dst; 879 struct if_clone *ifc; 880 int count, error = 0; 881 882 ifcr->ifcr_total = if_cloners_count; 883 if ((dst = ifcr->ifcr_buffer) == NULL) { 884 /* Just asking how many there are. */ 885 return 0; 886 } 887 888 if (ifcr->ifcr_count < 0) 889 return EINVAL; 890 891 count = (if_cloners_count < ifcr->ifcr_count) ? 892 if_cloners_count : ifcr->ifcr_count; 893 894 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 895 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 896 (void)strncpy(outbuf, ifc->ifc_name, sizeof(outbuf)); 897 if (outbuf[sizeof(outbuf) - 1] != '\0') 898 return ENAMETOOLONG; 899 error = copyout(outbuf, dst, sizeof(outbuf)); 900 if (error != 0) 901 break; 902 } 903 904 return error; 905 } 906 907 void 908 ifa_insert(struct ifnet *ifp, struct ifaddr *ifa) 909 { 910 ifa->ifa_ifp = ifp; 911 TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list); 912 IFAREF(ifa); 913 } 914 915 void 916 ifa_remove(struct ifnet *ifp, struct ifaddr *ifa) 917 { 918 KASSERT(ifa->ifa_ifp == ifp); 919 TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list); 920 IFAFREE(ifa); 921 } 922 923 static inline int 924 equal(const struct sockaddr *sa1, const struct sockaddr *sa2) 925 { 926 return sockaddr_cmp(sa1, sa2) == 0; 927 } 928 929 /* 930 * Locate an interface based on a complete address. 931 */ 932 /*ARGSUSED*/ 933 struct ifaddr * 934 ifa_ifwithaddr(const struct sockaddr *addr) 935 { 936 struct ifnet *ifp; 937 struct ifaddr *ifa; 938 939 IFNET_FOREACH(ifp) { 940 if (ifp->if_output == if_nulloutput) 941 continue; 942 IFADDR_FOREACH(ifa, ifp) { 943 if (ifa->ifa_addr->sa_family != addr->sa_family) 944 continue; 945 if (equal(addr, ifa->ifa_addr)) 946 return ifa; 947 if ((ifp->if_flags & IFF_BROADCAST) && 948 ifa->ifa_broadaddr && 949 /* IP6 doesn't have broadcast */ 950 ifa->ifa_broadaddr->sa_len != 0 && 951 equal(ifa->ifa_broadaddr, addr)) 952 return ifa; 953 } 954 } 955 return NULL; 956 } 957 958 /* 959 * Locate the point to point interface with a given destination address. 960 */ 961 /*ARGSUSED*/ 962 struct ifaddr * 963 ifa_ifwithdstaddr(const struct sockaddr *addr) 964 { 965 struct ifnet *ifp; 966 struct ifaddr *ifa; 967 968 IFNET_FOREACH(ifp) { 969 if (ifp->if_output == if_nulloutput) 970 continue; 971 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 972 continue; 973 IFADDR_FOREACH(ifa, ifp) { 974 if (ifa->ifa_addr->sa_family != addr->sa_family || 975 ifa->ifa_dstaddr == NULL) 976 continue; 977 if (equal(addr, ifa->ifa_dstaddr)) 978 return ifa; 979 } 980 } 981 return NULL; 982 } 983 984 /* 985 * Find an interface on a specific network. If many, choice 986 * is most specific found. 987 */ 988 struct ifaddr * 989 ifa_ifwithnet(const struct sockaddr *addr) 990 { 991 struct ifnet *ifp; 992 struct ifaddr *ifa; 993 const struct sockaddr_dl *sdl; 994 struct ifaddr *ifa_maybe = 0; 995 u_int af = addr->sa_family; 996 const char *addr_data = addr->sa_data, *cplim; 997 998 if (af == AF_LINK) { 999 sdl = satocsdl(addr); 1000 if (sdl->sdl_index && sdl->sdl_index < if_indexlim && 1001 ifindex2ifnet[sdl->sdl_index] && 1002 ifindex2ifnet[sdl->sdl_index]->if_output != if_nulloutput) 1003 return ifnet_addrs[sdl->sdl_index]; 1004 } 1005 #ifdef NETATALK 1006 if (af == AF_APPLETALK) { 1007 const struct sockaddr_at *sat, *sat2; 1008 sat = (const struct sockaddr_at *)addr; 1009 IFNET_FOREACH(ifp) { 1010 if (ifp->if_output == if_nulloutput) 1011 continue; 1012 ifa = at_ifawithnet((const struct sockaddr_at *)addr, ifp); 1013 if (ifa == NULL) 1014 continue; 1015 sat2 = (struct sockaddr_at *)ifa->ifa_addr; 1016 if (sat2->sat_addr.s_net == sat->sat_addr.s_net) 1017 return ifa; /* exact match */ 1018 if (ifa_maybe == NULL) { 1019 /* else keep the if with the right range */ 1020 ifa_maybe = ifa; 1021 } 1022 } 1023 return ifa_maybe; 1024 } 1025 #endif 1026 IFNET_FOREACH(ifp) { 1027 if (ifp->if_output == if_nulloutput) 1028 continue; 1029 IFADDR_FOREACH(ifa, ifp) { 1030 const char *cp, *cp2, *cp3; 1031 1032 if (ifa->ifa_addr->sa_family != af || 1033 ifa->ifa_netmask == NULL) 1034 next: continue; 1035 cp = addr_data; 1036 cp2 = ifa->ifa_addr->sa_data; 1037 cp3 = ifa->ifa_netmask->sa_data; 1038 cplim = (const char *)ifa->ifa_netmask + 1039 ifa->ifa_netmask->sa_len; 1040 while (cp3 < cplim) { 1041 if ((*cp++ ^ *cp2++) & *cp3++) { 1042 /* want to continue for() loop */ 1043 goto next; 1044 } 1045 } 1046 if (ifa_maybe == NULL || 1047 rn_refines((void *)ifa->ifa_netmask, 1048 (void *)ifa_maybe->ifa_netmask)) 1049 ifa_maybe = ifa; 1050 } 1051 } 1052 return ifa_maybe; 1053 } 1054 1055 /* 1056 * Find the interface of the addresss. 1057 */ 1058 struct ifaddr * 1059 ifa_ifwithladdr(const struct sockaddr *addr) 1060 { 1061 struct ifaddr *ia; 1062 1063 if ((ia = ifa_ifwithaddr(addr)) || (ia = ifa_ifwithdstaddr(addr)) || 1064 (ia = ifa_ifwithnet(addr))) 1065 return ia; 1066 return NULL; 1067 } 1068 1069 /* 1070 * Find an interface using a specific address family 1071 */ 1072 struct ifaddr * 1073 ifa_ifwithaf(int af) 1074 { 1075 struct ifnet *ifp; 1076 struct ifaddr *ifa; 1077 1078 IFNET_FOREACH(ifp) { 1079 if (ifp->if_output == if_nulloutput) 1080 continue; 1081 IFADDR_FOREACH(ifa, ifp) { 1082 if (ifa->ifa_addr->sa_family == af) 1083 return ifa; 1084 } 1085 } 1086 return NULL; 1087 } 1088 1089 /* 1090 * Find an interface address specific to an interface best matching 1091 * a given address. 1092 */ 1093 struct ifaddr * 1094 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 1095 { 1096 struct ifaddr *ifa; 1097 const char *cp, *cp2, *cp3; 1098 const char *cplim; 1099 struct ifaddr *ifa_maybe = 0; 1100 u_int af = addr->sa_family; 1101 1102 if (ifp->if_output == if_nulloutput) 1103 return NULL; 1104 1105 if (af >= AF_MAX) 1106 return NULL; 1107 1108 IFADDR_FOREACH(ifa, ifp) { 1109 if (ifa->ifa_addr->sa_family != af) 1110 continue; 1111 ifa_maybe = ifa; 1112 if (ifa->ifa_netmask == NULL) { 1113 if (equal(addr, ifa->ifa_addr) || 1114 (ifa->ifa_dstaddr && 1115 equal(addr, ifa->ifa_dstaddr))) 1116 return ifa; 1117 continue; 1118 } 1119 cp = addr->sa_data; 1120 cp2 = ifa->ifa_addr->sa_data; 1121 cp3 = ifa->ifa_netmask->sa_data; 1122 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1123 for (; cp3 < cplim; cp3++) { 1124 if ((*cp++ ^ *cp2++) & *cp3) 1125 break; 1126 } 1127 if (cp3 == cplim) 1128 return ifa; 1129 } 1130 return ifa_maybe; 1131 } 1132 1133 /* 1134 * Default action when installing a route with a Link Level gateway. 1135 * Lookup an appropriate real ifa to point to. 1136 * This should be moved to /sys/net/link.c eventually. 1137 */ 1138 void 1139 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1140 { 1141 struct ifaddr *ifa; 1142 const struct sockaddr *dst; 1143 struct ifnet *ifp; 1144 1145 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) || 1146 ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_getkey(rt)) == NULL)) 1147 return; 1148 if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) { 1149 rt_replace_ifa(rt, ifa); 1150 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1151 ifa->ifa_rtrequest(cmd, rt, info); 1152 } 1153 } 1154 1155 /* 1156 * Handle a change in the interface link state. 1157 */ 1158 void 1159 if_link_state_change(struct ifnet *ifp, int link_state) 1160 { 1161 if (ifp->if_link_state == link_state) 1162 return; 1163 ifp->if_link_state = link_state; 1164 /* Notify that the link state has changed. */ 1165 rt_ifmsg(ifp); 1166 #if NCARP > 0 1167 if (ifp->if_carp) 1168 carp_carpdev_state(ifp); 1169 #endif 1170 } 1171 1172 /* 1173 * Mark an interface down and notify protocols of 1174 * the transition. 1175 * NOTE: must be called at splsoftnet or equivalent. 1176 */ 1177 void 1178 if_down(struct ifnet *ifp) 1179 { 1180 struct ifaddr *ifa; 1181 1182 ifp->if_flags &= ~IFF_UP; 1183 microtime(&ifp->if_lastchange); 1184 IFADDR_FOREACH(ifa, ifp) 1185 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1186 IFQ_PURGE(&ifp->if_snd); 1187 #if NCARP > 0 1188 if (ifp->if_carp) 1189 carp_carpdev_state(ifp); 1190 #endif 1191 rt_ifmsg(ifp); 1192 } 1193 1194 /* 1195 * Mark an interface up and notify protocols of 1196 * the transition. 1197 * NOTE: must be called at splsoftnet or equivalent. 1198 */ 1199 void 1200 if_up(struct ifnet *ifp) 1201 { 1202 #ifdef notyet 1203 struct ifaddr *ifa; 1204 #endif 1205 1206 ifp->if_flags |= IFF_UP; 1207 microtime(&ifp->if_lastchange); 1208 #ifdef notyet 1209 /* this has no effect on IP, and will kill all ISO connections XXX */ 1210 IFADDR_FOREACH(ifa, ifp) 1211 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1212 #endif 1213 #if NCARP > 0 1214 if (ifp->if_carp) 1215 carp_carpdev_state(ifp); 1216 #endif 1217 rt_ifmsg(ifp); 1218 #ifdef INET6 1219 in6_if_up(ifp); 1220 #endif 1221 } 1222 1223 /* 1224 * Handle interface watchdog timer routines. Called 1225 * from softclock, we decrement timers (if set) and 1226 * call the appropriate interface routine on expiration. 1227 */ 1228 void 1229 if_slowtimo(void *arg) 1230 { 1231 struct ifnet *ifp; 1232 int s = splnet(); 1233 1234 IFNET_FOREACH(ifp) { 1235 if (ifp->if_timer == 0 || --ifp->if_timer) 1236 continue; 1237 if (ifp->if_watchdog != NULL) 1238 (*ifp->if_watchdog)(ifp); 1239 } 1240 splx(s); 1241 callout_reset(&if_slowtimo_ch, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 1242 } 1243 1244 /* 1245 * Set/clear promiscuous mode on interface ifp based on the truth value 1246 * of pswitch. The calls are reference counted so that only the first 1247 * "on" request actually has an effect, as does the final "off" request. 1248 * Results are undefined if the "off" and "on" requests are not matched. 1249 */ 1250 int 1251 ifpromisc(struct ifnet *ifp, int pswitch) 1252 { 1253 int pcount, ret; 1254 short flags; 1255 struct ifreq ifr; 1256 1257 pcount = ifp->if_pcount; 1258 flags = ifp->if_flags; 1259 if (pswitch) { 1260 /* 1261 * Allow the device to be "placed" into promiscuous 1262 * mode even if it is not configured up. It will 1263 * consult IFF_PROMISC when it is is brought up. 1264 */ 1265 if (ifp->if_pcount++ != 0) 1266 return 0; 1267 ifp->if_flags |= IFF_PROMISC; 1268 if ((ifp->if_flags & IFF_UP) == 0) 1269 return 0; 1270 } else { 1271 if (--ifp->if_pcount > 0) 1272 return 0; 1273 ifp->if_flags &= ~IFF_PROMISC; 1274 /* 1275 * If the device is not configured up, we should not need to 1276 * turn off promiscuous mode (device should have turned it 1277 * off when interface went down; and will look at IFF_PROMISC 1278 * again next time interface comes up). 1279 */ 1280 if ((ifp->if_flags & IFF_UP) == 0) 1281 return 0; 1282 } 1283 memset(&ifr, 0, sizeof(ifr)); 1284 ifr.ifr_flags = ifp->if_flags; 1285 ret = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (void *) &ifr); 1286 /* Restore interface state if not successful. */ 1287 if (ret != 0) { 1288 ifp->if_pcount = pcount; 1289 ifp->if_flags = flags; 1290 } 1291 return ret; 1292 } 1293 1294 /* 1295 * Map interface name to 1296 * interface structure pointer. 1297 */ 1298 struct ifnet * 1299 ifunit(const char *name) 1300 { 1301 struct ifnet *ifp; 1302 const char *cp = name; 1303 u_int unit = 0; 1304 u_int i; 1305 1306 /* 1307 * If the entire name is a number, treat it as an ifindex. 1308 */ 1309 for (i = 0; i < IFNAMSIZ && *cp >= '0' && *cp <= '9'; i++, cp++) { 1310 unit = unit * 10 + (*cp - '0'); 1311 } 1312 1313 /* 1314 * If the number took all of the name, then it's a valid ifindex. 1315 */ 1316 if (i == IFNAMSIZ || (cp != name && *cp == '\0')) { 1317 if (unit >= if_indexlim) 1318 return NULL; 1319 ifp = ifindex2ifnet[unit]; 1320 if (ifp == NULL || ifp->if_output == if_nulloutput) 1321 return NULL; 1322 return ifp; 1323 } 1324 1325 IFNET_FOREACH(ifp) { 1326 if (ifp->if_output == if_nulloutput) 1327 continue; 1328 if (strcmp(ifp->if_xname, name) == 0) 1329 return ifp; 1330 } 1331 return NULL; 1332 } 1333 1334 /* 1335 * Interface ioctls. 1336 */ 1337 int 1338 ifioctl(struct socket *so, u_long cmd, void *data, struct lwp *l) 1339 { 1340 struct ifnet *ifp; 1341 struct ifreq *ifr; 1342 struct ifcapreq *ifcr; 1343 struct ifdatareq *ifdr; 1344 int s, error = 0; 1345 #if defined(COMPAT_OSOCK) || defined(COMPAT_OIFREQ) 1346 u_long ocmd = cmd; 1347 #endif 1348 short oif_flags; 1349 #ifdef COMPAT_OIFREQ 1350 struct ifreq ifrb; 1351 struct oifreq *oifr = NULL; 1352 #endif 1353 1354 switch (cmd) { 1355 #ifdef COMPAT_OIFREQ 1356 case OSIOCGIFCONF: 1357 case OOSIOCGIFCONF: 1358 return compat_ifconf(cmd, data); 1359 #endif 1360 case SIOCGIFCONF: 1361 return ifconf(cmd, data); 1362 } 1363 1364 #ifdef COMPAT_OIFREQ 1365 cmd = compat_cvtcmd(cmd); 1366 if (cmd != ocmd) { 1367 oifr = data; 1368 data = ifr = &ifrb; 1369 ifreqo2n(oifr, ifr); 1370 } else 1371 #endif 1372 ifr = data; 1373 ifcr = data; 1374 ifdr = data; 1375 1376 ifp = ifunit(ifr->ifr_name); 1377 1378 switch (cmd) { 1379 case SIOCIFCREATE: 1380 case SIOCIFDESTROY: 1381 if (l != NULL) { 1382 error = kauth_authorize_network(l->l_cred, 1383 KAUTH_NETWORK_INTERFACE, 1384 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1385 (void *)cmd, NULL); 1386 if (error != 0) 1387 return error; 1388 } 1389 return (cmd == SIOCIFCREATE) ? 1390 if_clone_create(ifr->ifr_name) : 1391 if_clone_destroy(ifr->ifr_name); 1392 1393 case SIOCIFGCLONERS: 1394 return if_clone_list((struct if_clonereq *)data); 1395 } 1396 1397 if (ifp == NULL) 1398 return ENXIO; 1399 1400 switch (cmd) { 1401 case SIOCSIFFLAGS: 1402 case SIOCSIFCAP: 1403 case SIOCSIFMETRIC: 1404 case SIOCZIFDATA: 1405 case SIOCSIFMTU: 1406 case SIOCSIFPHYADDR: 1407 case SIOCDIFPHYADDR: 1408 #ifdef INET6 1409 case SIOCSIFPHYADDR_IN6: 1410 #endif 1411 case SIOCSLIFPHYADDR: 1412 case SIOCADDMULTI: 1413 case SIOCDELMULTI: 1414 case SIOCSIFMEDIA: 1415 case SIOCSDRVSPEC: 1416 case SIOCG80211: 1417 case SIOCS80211: 1418 case SIOCS80211NWID: 1419 case SIOCS80211NWKEY: 1420 case SIOCS80211POWER: 1421 case SIOCS80211BSSID: 1422 case SIOCS80211CHANNEL: 1423 if (l != NULL) { 1424 error = kauth_authorize_network(l->l_cred, 1425 KAUTH_NETWORK_INTERFACE, 1426 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1427 (void *)cmd, NULL); 1428 if (error != 0) 1429 return error; 1430 } 1431 } 1432 1433 oif_flags = ifp->if_flags; 1434 switch (cmd) { 1435 1436 case SIOCGIFFLAGS: 1437 ifr->ifr_flags = ifp->if_flags; 1438 break; 1439 1440 case SIOCGIFMETRIC: 1441 ifr->ifr_metric = ifp->if_metric; 1442 break; 1443 1444 case SIOCGIFMTU: 1445 ifr->ifr_mtu = ifp->if_mtu; 1446 break; 1447 1448 case SIOCGIFDLT: 1449 ifr->ifr_dlt = ifp->if_dlt; 1450 break; 1451 1452 case SIOCSIFFLAGS: 1453 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 1454 s = splnet(); 1455 if_down(ifp); 1456 splx(s); 1457 } 1458 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { 1459 s = splnet(); 1460 if_up(ifp); 1461 splx(s); 1462 } 1463 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1464 (ifr->ifr_flags &~ IFF_CANTCHANGE); 1465 if (ifp->if_ioctl) 1466 (void)(*ifp->if_ioctl)(ifp, cmd, data); 1467 break; 1468 1469 case SIOCGIFCAP: 1470 ifcr->ifcr_capabilities = ifp->if_capabilities; 1471 ifcr->ifcr_capenable = ifp->if_capenable; 1472 break; 1473 1474 case SIOCSIFCAP: 1475 if ((ifcr->ifcr_capenable & ~ifp->if_capabilities) != 0) 1476 return EINVAL; 1477 if (ifp->if_ioctl == NULL) 1478 return EOPNOTSUPP; 1479 1480 /* Must prevent race with packet reception here. */ 1481 s = splnet(); 1482 if (ifcr->ifcr_capenable != ifp->if_capenable) { 1483 struct ifreq ifrq; 1484 1485 ifrq.ifr_flags = ifp->if_flags; 1486 ifp->if_capenable = ifcr->ifcr_capenable; 1487 1488 /* Pre-compute the checksum flags mask. */ 1489 ifp->if_csum_flags_tx = 0; 1490 ifp->if_csum_flags_rx = 0; 1491 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Tx) { 1492 ifp->if_csum_flags_tx |= M_CSUM_IPv4; 1493 } 1494 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Rx) { 1495 ifp->if_csum_flags_rx |= M_CSUM_IPv4; 1496 } 1497 1498 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Tx) { 1499 ifp->if_csum_flags_tx |= M_CSUM_TCPv4; 1500 } 1501 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Rx) { 1502 ifp->if_csum_flags_rx |= M_CSUM_TCPv4; 1503 } 1504 1505 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Tx) { 1506 ifp->if_csum_flags_tx |= M_CSUM_UDPv4; 1507 } 1508 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Rx) { 1509 ifp->if_csum_flags_rx |= M_CSUM_UDPv4; 1510 } 1511 1512 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Tx) { 1513 ifp->if_csum_flags_tx |= M_CSUM_TCPv6; 1514 } 1515 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Rx) { 1516 ifp->if_csum_flags_rx |= M_CSUM_TCPv6; 1517 } 1518 1519 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Tx) { 1520 ifp->if_csum_flags_tx |= M_CSUM_UDPv6; 1521 } 1522 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Rx) { 1523 ifp->if_csum_flags_rx |= M_CSUM_UDPv6; 1524 } 1525 1526 /* 1527 * Only kick the interface if it's up. If it's 1528 * not up now, it will notice the cap enables 1529 * when it is brought up later. 1530 */ 1531 if (ifp->if_flags & IFF_UP) 1532 (void)(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, 1533 (void *)&ifrq); 1534 } 1535 splx(s); 1536 break; 1537 1538 case SIOCSIFMETRIC: 1539 ifp->if_metric = ifr->ifr_metric; 1540 break; 1541 1542 case SIOCGIFDATA: 1543 ifdr->ifdr_data = ifp->if_data; 1544 break; 1545 1546 case SIOCZIFDATA: 1547 ifdr->ifdr_data = ifp->if_data; 1548 /* 1549 * Assumes that the volatile counters that can be 1550 * zero'ed are at the end of if_data. 1551 */ 1552 memset(&ifp->if_data.ifi_ipackets, 0, sizeof(ifp->if_data) - 1553 offsetof(struct if_data, ifi_ipackets)); 1554 break; 1555 1556 case SIOCSIFMTU: 1557 { 1558 u_long oldmtu = ifp->if_mtu; 1559 1560 if (ifp->if_ioctl == NULL) 1561 return EOPNOTSUPP; 1562 error = (*ifp->if_ioctl)(ifp, cmd, data); 1563 1564 /* 1565 * If the link MTU changed, do network layer specific procedure. 1566 */ 1567 if (ifp->if_mtu != oldmtu) { 1568 #ifdef INET6 1569 nd6_setmtu(ifp); 1570 #endif 1571 } 1572 break; 1573 } 1574 case SIOCSIFPHYADDR: 1575 case SIOCDIFPHYADDR: 1576 #ifdef INET6 1577 case SIOCSIFPHYADDR_IN6: 1578 #endif 1579 case SIOCSLIFPHYADDR: 1580 case SIOCADDMULTI: 1581 case SIOCDELMULTI: 1582 case SIOCSIFMEDIA: 1583 case SIOCGIFPSRCADDR: 1584 case SIOCGIFPDSTADDR: 1585 case SIOCGLIFPHYADDR: 1586 case SIOCGIFMEDIA: 1587 case SIOCG80211: 1588 case SIOCS80211: 1589 case SIOCS80211NWID: 1590 case SIOCS80211NWKEY: 1591 case SIOCS80211POWER: 1592 case SIOCS80211BSSID: 1593 case SIOCS80211CHANNEL: 1594 if (ifp->if_ioctl == NULL) 1595 return EOPNOTSUPP; 1596 error = (*ifp->if_ioctl)(ifp, cmd, data); 1597 break; 1598 1599 case SIOCSDRVSPEC: 1600 default: 1601 if (so->so_proto == NULL) 1602 return EOPNOTSUPP; 1603 #ifdef COMPAT_OSOCK 1604 error = compat_ifioctl(so, ocmd, cmd, data, l); 1605 #else 1606 error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 1607 (struct mbuf *)cmd, (struct mbuf *)data, 1608 (struct mbuf *)ifp, l)); 1609 #endif 1610 break; 1611 } 1612 1613 if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) { 1614 #ifdef INET6 1615 if ((ifp->if_flags & IFF_UP) != 0) { 1616 s = splnet(); 1617 in6_if_up(ifp); 1618 splx(s); 1619 } 1620 #endif 1621 } 1622 #ifdef COMPAT_OIFREQ 1623 if (cmd != ocmd) 1624 ifreqn2o(oifr, ifr); 1625 #endif 1626 1627 return error; 1628 } 1629 1630 /* 1631 * Return interface configuration 1632 * of system. List may be used 1633 * in later ioctl's (above) to get 1634 * other information. 1635 * 1636 * Each record is a struct ifreq. Before the addition of 1637 * sockaddr_storage, the API rule was that sockaddr flavors that did 1638 * not fit would extend beyond the struct ifreq, with the next struct 1639 * ifreq starting sa_len beyond the struct sockaddr. Because the 1640 * union in struct ifreq includes struct sockaddr_storage, every kind 1641 * of sockaddr must fit. Thus, there are no longer any overlength 1642 * records. 1643 * 1644 * Records are added to the user buffer if they fit, and ifc_len is 1645 * adjusted to the length that was written. Thus, the user is only 1646 * assured of getting the complete list if ifc_len on return is at 1647 * least sizeof(struct ifreq) less than it was on entry. 1648 * 1649 * If the user buffer pointer is NULL, this routine copies no data and 1650 * returns the amount of space that would be needed. 1651 * 1652 * Invariants: 1653 * ifrp points to the next part of the user's buffer to be used. If 1654 * ifrp != NULL, space holds the number of bytes remaining that we may 1655 * write at ifrp. Otherwise, space holds the number of bytes that 1656 * would have been written had there been adequate space. 1657 */ 1658 /*ARGSUSED*/ 1659 int 1660 ifconf(u_long cmd, void *data) 1661 { 1662 struct ifconf *ifc = (struct ifconf *)data; 1663 struct ifnet *ifp; 1664 struct ifaddr *ifa; 1665 struct ifreq ifr, *ifrp; 1666 int space, error = 0; 1667 const int sz = (int)sizeof(struct ifreq); 1668 1669 if ((ifrp = ifc->ifc_req) == NULL) 1670 space = 0; 1671 else 1672 space = ifc->ifc_len; 1673 IFNET_FOREACH(ifp) { 1674 (void)strncpy(ifr.ifr_name, ifp->if_xname, 1675 sizeof(ifr.ifr_name)); 1676 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') 1677 return ENAMETOOLONG; 1678 if (IFADDR_EMPTY(ifp)) { 1679 /* Interface with no addresses - send zero sockaddr. */ 1680 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr)); 1681 if (ifrp != NULL) 1682 { 1683 if (space >= sz) { 1684 error = copyout(&ifr, ifrp, sz); 1685 if (error != 0) 1686 return (error); 1687 ifrp++; space -= sz; 1688 } 1689 } 1690 else 1691 space += sz; 1692 continue; 1693 } 1694 1695 IFADDR_FOREACH(ifa, ifp) { 1696 struct sockaddr *sa = ifa->ifa_addr; 1697 /* all sockaddrs must fit in sockaddr_storage */ 1698 KASSERT(sa->sa_len <= sizeof(ifr.ifr_ifru)); 1699 1700 if (ifrp != NULL) 1701 { 1702 memcpy(&ifr.ifr_space, sa, sa->sa_len); 1703 if (space >= sz) { 1704 error = copyout(&ifr, ifrp, sz); 1705 if (error != 0) 1706 return (error); 1707 ifrp++; space -= sz; 1708 } 1709 } 1710 else 1711 space += sz; 1712 } 1713 } 1714 if (ifrp != NULL) 1715 { 1716 KASSERT(0 <= space && space <= ifc->ifc_len); 1717 ifc->ifc_len -= space; 1718 } 1719 else 1720 { 1721 KASSERT(space >= 0); 1722 ifc->ifc_len = space; 1723 } 1724 return (0); 1725 } 1726 1727 int 1728 ifreq_setaddr(const u_long cmd, struct ifreq *ifr, const struct sockaddr *sa) 1729 { 1730 uint8_t len; 1731 u_long ncmd; 1732 const uint8_t osockspace = sizeof(ifr->ifr_addr); 1733 const uint8_t sockspace = sizeof(ifr->ifr_ifru.ifru_space); 1734 1735 #ifdef INET6 1736 if (cmd == SIOCGIFPSRCADDR_IN6 || cmd == SIOCGIFPDSTADDR_IN6) 1737 len = MIN(sizeof(struct sockaddr_in6), sa->sa_len); 1738 else 1739 #endif /* INET6 */ 1740 if ((ncmd = compat_cvtcmd(cmd)) != cmd) 1741 len = MIN(osockspace, sa->sa_len); 1742 else 1743 len = MIN(sockspace, sa->sa_len); 1744 if (len < sa->sa_len) 1745 return EFBIG; 1746 sockaddr_copy(&ifr->ifr_addr, len, sa); 1747 return 0; 1748 } 1749 1750 /* 1751 * Queue message on interface, and start output if interface 1752 * not yet active. 1753 */ 1754 int 1755 ifq_enqueue(struct ifnet *ifp, struct mbuf *m 1756 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 1757 { 1758 int len = m->m_pkthdr.len; 1759 int mflags = m->m_flags; 1760 int s = splnet(); 1761 int error; 1762 1763 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 1764 if (error != 0) 1765 goto out; 1766 ifp->if_obytes += len; 1767 if (mflags & M_MCAST) 1768 ifp->if_omcasts++; 1769 if ((ifp->if_flags & IFF_OACTIVE) == 0) 1770 (*ifp->if_start)(ifp); 1771 out: 1772 splx(s); 1773 return error; 1774 } 1775 1776 /* 1777 * Queue message on interface, possibly using a second fast queue 1778 */ 1779 int 1780 ifq_enqueue2(struct ifnet *ifp, struct ifqueue *ifq, struct mbuf *m 1781 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 1782 { 1783 int error = 0; 1784 1785 if (ifq != NULL 1786 #ifdef ALTQ 1787 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 1788 #endif 1789 ) { 1790 if (IF_QFULL(ifq)) { 1791 IF_DROP(&ifp->if_snd); 1792 m_freem(m); 1793 if (error == 0) 1794 error = ENOBUFS; 1795 } else 1796 IF_ENQUEUE(ifq, m); 1797 } else 1798 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 1799 if (error != 0) { 1800 ++ifp->if_oerrors; 1801 return error; 1802 } 1803 return 0; 1804 } 1805 1806 1807 #if defined(INET) || defined(INET6) 1808 static void 1809 sysctl_net_ifq_setup(struct sysctllog **clog, 1810 int pf, const char *pfname, 1811 int ipn, const char *ipname, 1812 int qid, struct ifqueue *ifq) 1813 { 1814 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT, 1817 CTLTYPE_NODE, "net", NULL, 1818 NULL, 0, NULL, 0, 1819 CTL_NET, CTL_EOL); 1820 sysctl_createv(clog, 0, NULL, NULL, 1821 CTLFLAG_PERMANENT, 1822 CTLTYPE_NODE, pfname, NULL, 1823 NULL, 0, NULL, 0, 1824 CTL_NET, pf, CTL_EOL); 1825 sysctl_createv(clog, 0, NULL, NULL, 1826 CTLFLAG_PERMANENT, 1827 CTLTYPE_NODE, ipname, NULL, 1828 NULL, 0, NULL, 0, 1829 CTL_NET, pf, ipn, CTL_EOL); 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT, 1832 CTLTYPE_NODE, "ifq", 1833 SYSCTL_DESCR("Protocol input queue controls"), 1834 NULL, 0, NULL, 0, 1835 CTL_NET, pf, ipn, qid, CTL_EOL); 1836 1837 sysctl_createv(clog, 0, NULL, NULL, 1838 CTLFLAG_PERMANENT, 1839 CTLTYPE_INT, "len", 1840 SYSCTL_DESCR("Current input queue length"), 1841 NULL, 0, &ifq->ifq_len, 0, 1842 CTL_NET, pf, ipn, qid, IFQCTL_LEN, CTL_EOL); 1843 sysctl_createv(clog, 0, NULL, NULL, 1844 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1845 CTLTYPE_INT, "maxlen", 1846 SYSCTL_DESCR("Maximum allowed input queue length"), 1847 NULL, 0, &ifq->ifq_maxlen, 0, 1848 CTL_NET, pf, ipn, qid, IFQCTL_MAXLEN, CTL_EOL); 1849 #ifdef notyet 1850 sysctl_createv(clog, 0, NULL, NULL, 1851 CTLFLAG_PERMANENT, 1852 CTLTYPE_INT, "peak", 1853 SYSCTL_DESCR("Highest input queue length"), 1854 NULL, 0, &ifq->ifq_peak, 0, 1855 CTL_NET, pf, ipn, qid, IFQCTL_PEAK, CTL_EOL); 1856 #endif 1857 sysctl_createv(clog, 0, NULL, NULL, 1858 CTLFLAG_PERMANENT, 1859 CTLTYPE_INT, "drops", 1860 SYSCTL_DESCR("Packets dropped due to full input queue"), 1861 NULL, 0, &ifq->ifq_drops, 0, 1862 CTL_NET, pf, ipn, qid, IFQCTL_DROPS, CTL_EOL); 1863 } 1864 1865 #ifdef INET 1866 SYSCTL_SETUP(sysctl_net_inet_ip_ifq_setup, 1867 "sysctl net.inet.ip.ifq subtree setup") 1868 { 1869 extern struct ifqueue ipintrq; 1870 1871 sysctl_net_ifq_setup(clog, PF_INET, "inet", IPPROTO_IP, "ip", 1872 IPCTL_IFQ, &ipintrq); 1873 } 1874 #endif /* INET */ 1875 1876 #ifdef INET6 1877 SYSCTL_SETUP(sysctl_net_inet6_ip6_ifq_setup, 1878 "sysctl net.inet6.ip6.ifq subtree setup") 1879 { 1880 extern struct ifqueue ip6intrq; 1881 1882 sysctl_net_ifq_setup(clog, PF_INET6, "inet6", IPPROTO_IPV6, "ip6", 1883 IPV6CTL_IFQ, &ip6intrq); 1884 } 1885 #endif /* INET6 */ 1886 #endif /* INET || INET6 */ 1887
Indexes created Sun Sep 21 20:09:37 GMT 2025