1 /* $NetBSD: if.c,v 1.220 2008/04/24 13:30:52 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2000, 2001, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by William Studenmund and Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 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 1.220 2008/04/24 13:30:52 martin 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 void 265 if_set_sadl(struct ifnet *ifp, const void *lla, u_char addrlen) 266 { 267 struct ifaddr *ifa; 268 struct sockaddr_dl *sdl; 269 270 ifp->if_addrlen = addrlen; 271 if_alloc_sadl(ifp); 272 ifa = ifp->if_dl; 273 sdl = satosdl(ifa->ifa_addr); 274 275 (void)sockaddr_dl_setaddr(sdl, sdl->sdl_len, lla, ifp->if_addrlen); 276 } 277 278 struct ifaddr * 279 if_dl_create(const struct ifnet *ifp, const struct sockaddr_dl **sdlp) 280 { 281 unsigned socksize, ifasize; 282 int addrlen, namelen; 283 struct sockaddr_dl *mask, *sdl; 284 struct ifaddr *ifa; 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 ifa->ifa_rtrequest = link_rtrequest; 300 ifa->ifa_addr = (struct sockaddr *)sdl; 301 ifa->ifa_netmask = (struct sockaddr *)mask; 302 303 *sdlp = sdl; 304 305 return ifa; 306 } 307 308 /* 309 * Allocate the link level name for the specified interface. This 310 * is an attachment helper. It must be called after ifp->if_addrlen 311 * is initialized, which may not be the case when if_attach() is 312 * called. 313 */ 314 void 315 if_alloc_sadl(struct ifnet *ifp) 316 { 317 struct ifaddr *ifa; 318 const struct sockaddr_dl *sdl; 319 320 /* 321 * If the interface already has a link name, release it 322 * now. This is useful for interfaces that can change 323 * link types, and thus switch link names often. 324 */ 325 if (ifp->if_sadl != NULL) 326 if_free_sadl(ifp); 327 328 ifa = if_dl_create(ifp, &sdl); 329 330 ifnet_addrs[ifp->if_index] = ifa; 331 IFAREF(ifa); 332 ifa_insert(ifp, ifa); 333 ifp->if_dl = ifa; 334 IFAREF(ifa); 335 ifp->if_sadl = sdl; 336 } 337 338 /* 339 * Free the link level name for the specified interface. This is 340 * a detach helper. This is called from if_detach() or from 341 * link layer type specific detach functions. 342 */ 343 void 344 if_free_sadl(struct ifnet *ifp) 345 { 346 struct ifaddr *ifa; 347 int s; 348 349 ifa = ifnet_addrs[ifp->if_index]; 350 if (ifa == NULL) { 351 KASSERT(ifp->if_sadl == NULL); 352 KASSERT(ifp->if_dl == NULL); 353 return; 354 } 355 356 KASSERT(ifp->if_sadl != NULL); 357 KASSERT(ifp->if_dl != NULL); 358 359 s = splnet(); 360 rtinit(ifa, RTM_DELETE, 0); 361 ifa_remove(ifp, ifa); 362 363 ifp->if_sadl = NULL; 364 365 ifnet_addrs[ifp->if_index] = NULL; 366 IFAFREE(ifa); 367 ifp->if_dl = NULL; 368 IFAFREE(ifa); 369 splx(s); 370 } 371 372 /* 373 * Attach an interface to the 374 * list of "active" interfaces. 375 */ 376 void 377 if_attach(struct ifnet *ifp) 378 { 379 int indexlim = 0; 380 381 if (if_indexlim == 0) { 382 TAILQ_INIT(&ifnet); 383 if_indexlim = 8; 384 } 385 TAILQ_INIT(&ifp->if_addrlist); 386 TAILQ_INSERT_TAIL(&ifnet, ifp, if_list); 387 ifp->if_index = if_index; 388 if (ifindex2ifnet == NULL) 389 if_index++; 390 else 391 while (ifp->if_index < if_indexlim && 392 ifindex2ifnet[ifp->if_index] != NULL) { 393 ++if_index; 394 if (if_index == 0) 395 if_index = 1; 396 /* 397 * If we hit USHRT_MAX, we skip back to 0 since 398 * there are a number of places where the value 399 * of if_index or if_index itself is compared 400 * to or stored in an unsigned short. By 401 * jumping back, we won't botch those assignments 402 * or comparisons. 403 */ 404 else if (if_index == USHRT_MAX) { 405 /* 406 * However, if we have to jump back to 407 * zero *twice* without finding an empty 408 * slot in ifindex2ifnet[], then there 409 * there are too many (>65535) interfaces. 410 */ 411 if (indexlim++) 412 panic("too many interfaces"); 413 else 414 if_index = 1; 415 } 416 ifp->if_index = if_index; 417 } 418 419 /* 420 * We have some arrays that should be indexed by if_index. 421 * since if_index will grow dynamically, they should grow too. 422 * struct ifadd **ifnet_addrs 423 * struct ifnet **ifindex2ifnet 424 */ 425 if (ifnet_addrs == NULL || ifindex2ifnet == NULL || 426 ifp->if_index >= if_indexlim) { 427 size_t m, n, oldlim; 428 void *q; 429 430 oldlim = if_indexlim; 431 while (ifp->if_index >= if_indexlim) 432 if_indexlim <<= 1; 433 434 /* grow ifnet_addrs */ 435 m = oldlim * sizeof(struct ifaddr *); 436 n = if_indexlim * sizeof(struct ifaddr *); 437 q = (void *)malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 438 if (ifnet_addrs != NULL) { 439 memcpy(q, ifnet_addrs, m); 440 free((void *)ifnet_addrs, M_IFADDR); 441 } 442 ifnet_addrs = (struct ifaddr **)q; 443 444 /* grow ifindex2ifnet */ 445 m = oldlim * sizeof(struct ifnet *); 446 n = if_indexlim * sizeof(struct ifnet *); 447 q = (void *)malloc(n, M_IFADDR, M_WAITOK|M_ZERO); 448 if (ifindex2ifnet != NULL) { 449 memcpy(q, (void *)ifindex2ifnet, m); 450 free((void *)ifindex2ifnet, M_IFADDR); 451 } 452 ifindex2ifnet = (struct ifnet **)q; 453 } 454 455 ifindex2ifnet[ifp->if_index] = ifp; 456 457 /* 458 * Link level name is allocated later by a separate call to 459 * if_alloc_sadl(). 460 */ 461 462 if (ifp->if_snd.ifq_maxlen == 0) 463 ifp->if_snd.ifq_maxlen = ifqmaxlen; 464 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 465 466 ifp->if_link_state = LINK_STATE_UNKNOWN; 467 468 ifp->if_capenable = 0; 469 ifp->if_csum_flags_tx = 0; 470 ifp->if_csum_flags_rx = 0; 471 472 #ifdef ALTQ 473 ifp->if_snd.altq_type = 0; 474 ifp->if_snd.altq_disc = NULL; 475 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 476 ifp->if_snd.altq_tbr = NULL; 477 ifp->if_snd.altq_ifp = ifp; 478 #endif 479 480 #ifdef PFIL_HOOKS 481 ifp->if_pfil.ph_type = PFIL_TYPE_IFNET; 482 ifp->if_pfil.ph_ifnet = ifp; 483 if (pfil_head_register(&ifp->if_pfil) != 0) 484 printf("%s: WARNING: unable to register pfil hook\n", 485 ifp->if_xname); 486 (void)pfil_run_hooks(&if_pfil, 487 (struct mbuf **)PFIL_IFNET_ATTACH, ifp, PFIL_IFNET); 488 #endif 489 490 if (!STAILQ_EMPTY(&domains)) 491 if_attachdomain1(ifp); 492 493 /* Announce the interface. */ 494 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 495 } 496 497 void 498 if_attachdomain(void) 499 { 500 struct ifnet *ifp; 501 int s; 502 503 s = splnet(); 504 IFNET_FOREACH(ifp) 505 if_attachdomain1(ifp); 506 splx(s); 507 } 508 509 void 510 if_attachdomain1(struct ifnet *ifp) 511 { 512 struct domain *dp; 513 int s; 514 515 s = splnet(); 516 517 /* address family dependent data region */ 518 memset(ifp->if_afdata, 0, sizeof(ifp->if_afdata)); 519 DOMAIN_FOREACH(dp) { 520 if (dp->dom_ifattach != NULL) 521 ifp->if_afdata[dp->dom_family] = 522 (*dp->dom_ifattach)(ifp); 523 } 524 525 splx(s); 526 } 527 528 /* 529 * Deactivate an interface. This points all of the procedure 530 * handles at error stubs. May be called from interrupt context. 531 */ 532 void 533 if_deactivate(struct ifnet *ifp) 534 { 535 int s; 536 537 s = splnet(); 538 539 ifp->if_output = if_nulloutput; 540 ifp->if_input = if_nullinput; 541 ifp->if_start = if_nullstart; 542 ifp->if_ioctl = if_nullioctl; 543 ifp->if_init = if_nullinit; 544 ifp->if_stop = if_nullstop; 545 ifp->if_watchdog = if_nullwatchdog; 546 ifp->if_drain = if_nulldrain; 547 548 /* No more packets may be enqueued. */ 549 ifp->if_snd.ifq_maxlen = 0; 550 551 splx(s); 552 } 553 554 void 555 if_purgeaddrs(struct ifnet *ifp, int family, void (*purgeaddr)(struct ifaddr *)) 556 { 557 struct ifaddr *ifa, *nifa; 558 559 for (ifa = IFADDR_FIRST(ifp); ifa != NULL; ifa = nifa) { 560 nifa = IFADDR_NEXT(ifa); 561 if (ifa->ifa_addr->sa_family != family) 562 continue; 563 (*purgeaddr)(ifa); 564 } 565 } 566 567 /* 568 * Detach an interface from the list of "active" interfaces, 569 * freeing any resources as we go along. 570 * 571 * NOTE: This routine must be called with a valid thread context, 572 * as it may block. 573 */ 574 void 575 if_detach(struct ifnet *ifp) 576 { 577 struct socket so; 578 struct ifaddr *ifa; 579 #ifdef IFAREF_DEBUG 580 struct ifaddr *last_ifa = NULL; 581 #endif 582 struct domain *dp; 583 const struct protosw *pr; 584 int s, i, family, purged; 585 586 /* 587 * XXX It's kind of lame that we have to have the 588 * XXX socket structure... 589 */ 590 memset(&so, 0, sizeof(so)); 591 592 s = splnet(); 593 594 /* 595 * Do an if_down() to give protocols a chance to do something. 596 */ 597 if_down(ifp); 598 599 #ifdef ALTQ 600 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 601 altq_disable(&ifp->if_snd); 602 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 603 altq_detach(&ifp->if_snd); 604 #endif 605 606 607 #if NCARP > 0 608 /* Remove the interface from any carp group it is a part of. */ 609 if (ifp->if_carp != NULL && ifp->if_type != IFT_CARP) 610 carp_ifdetach(ifp); 611 #endif 612 613 /* 614 * Rip all the addresses off the interface. This should make 615 * all of the routes go away. 616 * 617 * pr_usrreq calls can remove an arbitrary number of ifaddrs 618 * from the list, including our "cursor", ifa. For safety, 619 * and to honor the TAILQ abstraction, I just restart the 620 * loop after each removal. Note that the loop will exit 621 * when all of the remaining ifaddrs belong to the AF_LINK 622 * family. I am counting on the historical fact that at 623 * least one pr_usrreq in each address domain removes at 624 * least one ifaddr. 625 */ 626 again: 627 IFADDR_FOREACH(ifa, ifp) { 628 family = ifa->ifa_addr->sa_family; 629 #ifdef IFAREF_DEBUG 630 printf("if_detach: ifaddr %p, family %d, refcnt %d\n", 631 ifa, family, ifa->ifa_refcnt); 632 if (last_ifa != NULL && ifa == last_ifa) 633 panic("if_detach: loop detected"); 634 last_ifa = ifa; 635 #endif 636 if (family == AF_LINK) 637 continue; 638 dp = pffinddomain(family); 639 #ifdef DIAGNOSTIC 640 if (dp == NULL) 641 panic("if_detach: no domain for AF %d", 642 family); 643 #endif 644 /* 645 * XXX These PURGEIF calls are redundant with the 646 * purge-all-families calls below, but are left in for 647 * now both to make a smaller change, and to avoid 648 * unplanned interactions with clearing of 649 * ifp->if_addrlist. 650 */ 651 purged = 0; 652 for (pr = dp->dom_protosw; 653 pr < dp->dom_protoswNPROTOSW; pr++) { 654 so.so_proto = pr; 655 if (pr->pr_usrreq != NULL) { 656 (void) (*pr->pr_usrreq)(&so, 657 PRU_PURGEIF, NULL, NULL, 658 (struct mbuf *) ifp, curlwp); 659 purged = 1; 660 } 661 } 662 if (purged == 0) { 663 /* 664 * XXX What's really the best thing to do 665 * XXX here? --thorpej@NetBSD.org 666 */ 667 printf("if_detach: WARNING: AF %d not purged\n", 668 family); 669 ifa_remove(ifp, ifa); 670 } 671 goto again; 672 } 673 674 if_free_sadl(ifp); 675 676 /* Walk the routing table looking for stragglers. */ 677 for (i = 0; i <= AF_MAX; i++) 678 (void)rt_walktree(i, if_rt_walktree, ifp); 679 680 DOMAIN_FOREACH(dp) { 681 if (dp->dom_ifdetach != NULL && ifp->if_afdata[dp->dom_family]) 682 (*dp->dom_ifdetach)(ifp, 683 ifp->if_afdata[dp->dom_family]); 684 685 /* 686 * One would expect multicast memberships (INET and 687 * INET6) on UDP sockets to be purged by the PURGEIF 688 * calls above, but if all addresses were removed from 689 * the interface prior to destruction, the calls will 690 * not be made (e.g. ppp, for which pppd(8) generally 691 * removes addresses before destroying the interface). 692 * Because there is no invariant that multicast 693 * memberships only exist for interfaces with IPv4 694 * addresses, we must call PURGEIF regardless of 695 * addresses. (Protocols which might store ifnet 696 * pointers are marked with PR_PURGEIF.) 697 */ 698 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) { 699 so.so_proto = pr; 700 if (pr->pr_usrreq != NULL && pr->pr_flags & PR_PURGEIF) 701 (void)(*pr->pr_usrreq)(&so, PRU_PURGEIF, NULL, 702 NULL, (struct mbuf *)ifp, curlwp); 703 } 704 } 705 706 #ifdef PFIL_HOOKS 707 (void)pfil_run_hooks(&if_pfil, 708 (struct mbuf **)PFIL_IFNET_DETACH, ifp, PFIL_IFNET); 709 (void)pfil_head_unregister(&ifp->if_pfil); 710 #endif 711 712 /* Announce that the interface is gone. */ 713 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 714 715 ifindex2ifnet[ifp->if_index] = NULL; 716 717 TAILQ_REMOVE(&ifnet, ifp, if_list); 718 719 /* 720 * remove packets that came from ifp, from software interrupt queues. 721 */ 722 DOMAIN_FOREACH(dp) { 723 for (i = 0; i < __arraycount(dp->dom_ifqueues); i++) { 724 if (dp->dom_ifqueues[i] == NULL) 725 break; 726 if_detach_queues(ifp, dp->dom_ifqueues[i]); 727 } 728 } 729 730 splx(s); 731 } 732 733 static void 734 if_detach_queues(struct ifnet *ifp, struct ifqueue *q) 735 { 736 struct mbuf *m, *prev, *next; 737 738 prev = NULL; 739 for (m = q->ifq_head; m != NULL; m = next) { 740 next = m->m_nextpkt; 741 #ifdef DIAGNOSTIC 742 if ((m->m_flags & M_PKTHDR) == 0) { 743 prev = m; 744 continue; 745 } 746 #endif 747 if (m->m_pkthdr.rcvif != ifp) { 748 prev = m; 749 continue; 750 } 751 752 if (prev != NULL) 753 prev->m_nextpkt = m->m_nextpkt; 754 else 755 q->ifq_head = m->m_nextpkt; 756 if (q->ifq_tail == m) 757 q->ifq_tail = prev; 758 q->ifq_len--; 759 760 m->m_nextpkt = NULL; 761 m_freem(m); 762 IF_DROP(q); 763 } 764 } 765 766 /* 767 * Callback for a radix tree walk to delete all references to an 768 * ifnet. 769 */ 770 static int 771 if_rt_walktree(struct rtentry *rt, void *v) 772 { 773 struct ifnet *ifp = (struct ifnet *)v; 774 int error; 775 776 if (rt->rt_ifp != ifp) 777 return 0; 778 779 /* Delete the entry. */ 780 ++rt->rt_refcnt; 781 error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway, 782 rt_mask(rt), rt->rt_flags, NULL); 783 KASSERT((rt->rt_flags & RTF_UP) == 0); 784 rt->rt_ifp = NULL; 785 RTFREE(rt); 786 if (error != 0) 787 printf("%s: warning: unable to delete rtentry @ %p, " 788 "error = %d\n", ifp->if_xname, rt, error); 789 return 0; 790 } 791 792 /* 793 * Create a clone network interface. 794 */ 795 int 796 if_clone_create(const char *name) 797 { 798 struct if_clone *ifc; 799 int unit; 800 801 ifc = if_clone_lookup(name, &unit); 802 if (ifc == NULL) 803 return EINVAL; 804 805 if (ifunit(name) != NULL) 806 return EEXIST; 807 808 return (*ifc->ifc_create)(ifc, unit); 809 } 810 811 /* 812 * Destroy a clone network interface. 813 */ 814 int 815 if_clone_destroy(const char *name) 816 { 817 struct if_clone *ifc; 818 struct ifnet *ifp; 819 820 ifc = if_clone_lookup(name, NULL); 821 if (ifc == NULL) 822 return EINVAL; 823 824 ifp = ifunit(name); 825 if (ifp == NULL) 826 return ENXIO; 827 828 if (ifc->ifc_destroy == NULL) 829 return EOPNOTSUPP; 830 831 return (*ifc->ifc_destroy)(ifp); 832 } 833 834 /* 835 * Look up a network interface cloner. 836 */ 837 static struct if_clone * 838 if_clone_lookup(const char *name, int *unitp) 839 { 840 struct if_clone *ifc; 841 const char *cp; 842 int unit; 843 844 /* separate interface name from unit */ 845 for (cp = name; 846 cp - name < IFNAMSIZ && *cp && (*cp < '0' || *cp > '9'); 847 cp++) 848 continue; 849 850 if (cp == name || cp - name == IFNAMSIZ || !*cp) 851 return NULL; /* No name or unit number */ 852 853 LIST_FOREACH(ifc, &if_cloners, ifc_list) { 854 if (strlen(ifc->ifc_name) == cp - name && 855 strncmp(name, ifc->ifc_name, cp - name) == 0) 856 break; 857 } 858 859 if (ifc == NULL) 860 return NULL; 861 862 unit = 0; 863 while (cp - name < IFNAMSIZ && *cp) { 864 if (*cp < '0' || *cp > '9' || unit > INT_MAX / 10) { 865 /* Bogus unit number. */ 866 return NULL; 867 } 868 unit = (unit * 10) + (*cp++ - '0'); 869 } 870 871 if (unitp != NULL) 872 *unitp = unit; 873 return ifc; 874 } 875 876 /* 877 * Register a network interface cloner. 878 */ 879 void 880 if_clone_attach(struct if_clone *ifc) 881 { 882 883 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 884 if_cloners_count++; 885 } 886 887 /* 888 * Unregister a network interface cloner. 889 */ 890 void 891 if_clone_detach(struct if_clone *ifc) 892 { 893 894 LIST_REMOVE(ifc, ifc_list); 895 if_cloners_count--; 896 } 897 898 /* 899 * Provide list of interface cloners to userspace. 900 */ 901 static int 902 if_clone_list(struct if_clonereq *ifcr) 903 { 904 char outbuf[IFNAMSIZ], *dst; 905 struct if_clone *ifc; 906 int count, error = 0; 907 908 ifcr->ifcr_total = if_cloners_count; 909 if ((dst = ifcr->ifcr_buffer) == NULL) { 910 /* Just asking how many there are. */ 911 return 0; 912 } 913 914 if (ifcr->ifcr_count < 0) 915 return EINVAL; 916 917 count = (if_cloners_count < ifcr->ifcr_count) ? 918 if_cloners_count : ifcr->ifcr_count; 919 920 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 921 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 922 (void)strncpy(outbuf, ifc->ifc_name, sizeof(outbuf)); 923 if (outbuf[sizeof(outbuf) - 1] != '\0') 924 return ENAMETOOLONG; 925 error = copyout(outbuf, dst, sizeof(outbuf)); 926 if (error != 0) 927 break; 928 } 929 930 return error; 931 } 932 933 void 934 ifa_insert(struct ifnet *ifp, struct ifaddr *ifa) 935 { 936 ifa->ifa_ifp = ifp; 937 TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list); 938 IFAREF(ifa); 939 } 940 941 void 942 ifa_remove(struct ifnet *ifp, struct ifaddr *ifa) 943 { 944 KASSERT(ifa->ifa_ifp == ifp); 945 TAILQ_REMOVE(&ifp->if_addrlist, ifa, ifa_list); 946 IFAFREE(ifa); 947 } 948 949 static inline int 950 equal(const struct sockaddr *sa1, const struct sockaddr *sa2) 951 { 952 return sockaddr_cmp(sa1, sa2) == 0; 953 } 954 955 /* 956 * Locate an interface based on a complete address. 957 */ 958 /*ARGSUSED*/ 959 struct ifaddr * 960 ifa_ifwithaddr(const struct sockaddr *addr) 961 { 962 struct ifnet *ifp; 963 struct ifaddr *ifa; 964 965 IFNET_FOREACH(ifp) { 966 if (ifp->if_output == if_nulloutput) 967 continue; 968 IFADDR_FOREACH(ifa, ifp) { 969 if (ifa->ifa_addr->sa_family != addr->sa_family) 970 continue; 971 if (equal(addr, ifa->ifa_addr)) 972 return ifa; 973 if ((ifp->if_flags & IFF_BROADCAST) && 974 ifa->ifa_broadaddr && 975 /* IP6 doesn't have broadcast */ 976 ifa->ifa_broadaddr->sa_len != 0 && 977 equal(ifa->ifa_broadaddr, addr)) 978 return ifa; 979 } 980 } 981 return NULL; 982 } 983 984 /* 985 * Locate the point to point interface with a given destination address. 986 */ 987 /*ARGSUSED*/ 988 struct ifaddr * 989 ifa_ifwithdstaddr(const struct sockaddr *addr) 990 { 991 struct ifnet *ifp; 992 struct ifaddr *ifa; 993 994 IFNET_FOREACH(ifp) { 995 if (ifp->if_output == if_nulloutput) 996 continue; 997 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 998 continue; 999 IFADDR_FOREACH(ifa, ifp) { 1000 if (ifa->ifa_addr->sa_family != addr->sa_family || 1001 ifa->ifa_dstaddr == NULL) 1002 continue; 1003 if (equal(addr, ifa->ifa_dstaddr)) 1004 return ifa; 1005 } 1006 } 1007 return NULL; 1008 } 1009 1010 /* 1011 * Find an interface on a specific network. If many, choice 1012 * is most specific found. 1013 */ 1014 struct ifaddr * 1015 ifa_ifwithnet(const struct sockaddr *addr) 1016 { 1017 struct ifnet *ifp; 1018 struct ifaddr *ifa; 1019 const struct sockaddr_dl *sdl; 1020 struct ifaddr *ifa_maybe = 0; 1021 u_int af = addr->sa_family; 1022 const char *addr_data = addr->sa_data, *cplim; 1023 1024 if (af == AF_LINK) { 1025 sdl = satocsdl(addr); 1026 if (sdl->sdl_index && sdl->sdl_index < if_indexlim && 1027 ifindex2ifnet[sdl->sdl_index] && 1028 ifindex2ifnet[sdl->sdl_index]->if_output != if_nulloutput) 1029 return ifnet_addrs[sdl->sdl_index]; 1030 } 1031 #ifdef NETATALK 1032 if (af == AF_APPLETALK) { 1033 const struct sockaddr_at *sat, *sat2; 1034 sat = (const struct sockaddr_at *)addr; 1035 IFNET_FOREACH(ifp) { 1036 if (ifp->if_output == if_nulloutput) 1037 continue; 1038 ifa = at_ifawithnet((const struct sockaddr_at *)addr, ifp); 1039 if (ifa == NULL) 1040 continue; 1041 sat2 = (struct sockaddr_at *)ifa->ifa_addr; 1042 if (sat2->sat_addr.s_net == sat->sat_addr.s_net) 1043 return ifa; /* exact match */ 1044 if (ifa_maybe == NULL) { 1045 /* else keep the if with the right range */ 1046 ifa_maybe = ifa; 1047 } 1048 } 1049 return ifa_maybe; 1050 } 1051 #endif 1052 IFNET_FOREACH(ifp) { 1053 if (ifp->if_output == if_nulloutput) 1054 continue; 1055 IFADDR_FOREACH(ifa, ifp) { 1056 const char *cp, *cp2, *cp3; 1057 1058 if (ifa->ifa_addr->sa_family != af || 1059 ifa->ifa_netmask == NULL) 1060 next: continue; 1061 cp = addr_data; 1062 cp2 = ifa->ifa_addr->sa_data; 1063 cp3 = ifa->ifa_netmask->sa_data; 1064 cplim = (const char *)ifa->ifa_netmask + 1065 ifa->ifa_netmask->sa_len; 1066 while (cp3 < cplim) { 1067 if ((*cp++ ^ *cp2++) & *cp3++) { 1068 /* want to continue for() loop */ 1069 goto next; 1070 } 1071 } 1072 if (ifa_maybe == NULL || 1073 rn_refines((void *)ifa->ifa_netmask, 1074 (void *)ifa_maybe->ifa_netmask)) 1075 ifa_maybe = ifa; 1076 } 1077 } 1078 return ifa_maybe; 1079 } 1080 1081 /* 1082 * Find the interface of the addresss. 1083 */ 1084 struct ifaddr * 1085 ifa_ifwithladdr(const struct sockaddr *addr) 1086 { 1087 struct ifaddr *ia; 1088 1089 if ((ia = ifa_ifwithaddr(addr)) || (ia = ifa_ifwithdstaddr(addr)) || 1090 (ia = ifa_ifwithnet(addr))) 1091 return ia; 1092 return NULL; 1093 } 1094 1095 /* 1096 * Find an interface using a specific address family 1097 */ 1098 struct ifaddr * 1099 ifa_ifwithaf(int af) 1100 { 1101 struct ifnet *ifp; 1102 struct ifaddr *ifa; 1103 1104 IFNET_FOREACH(ifp) { 1105 if (ifp->if_output == if_nulloutput) 1106 continue; 1107 IFADDR_FOREACH(ifa, ifp) { 1108 if (ifa->ifa_addr->sa_family == af) 1109 return ifa; 1110 } 1111 } 1112 return NULL; 1113 } 1114 1115 /* 1116 * Find an interface address specific to an interface best matching 1117 * a given address. 1118 */ 1119 struct ifaddr * 1120 ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp) 1121 { 1122 struct ifaddr *ifa; 1123 const char *cp, *cp2, *cp3; 1124 const char *cplim; 1125 struct ifaddr *ifa_maybe = 0; 1126 u_int af = addr->sa_family; 1127 1128 if (ifp->if_output == if_nulloutput) 1129 return NULL; 1130 1131 if (af >= AF_MAX) 1132 return NULL; 1133 1134 IFADDR_FOREACH(ifa, ifp) { 1135 if (ifa->ifa_addr->sa_family != af) 1136 continue; 1137 ifa_maybe = ifa; 1138 if (ifa->ifa_netmask == NULL) { 1139 if (equal(addr, ifa->ifa_addr) || 1140 (ifa->ifa_dstaddr && 1141 equal(addr, ifa->ifa_dstaddr))) 1142 return ifa; 1143 continue; 1144 } 1145 cp = addr->sa_data; 1146 cp2 = ifa->ifa_addr->sa_data; 1147 cp3 = ifa->ifa_netmask->sa_data; 1148 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1149 for (; cp3 < cplim; cp3++) { 1150 if ((*cp++ ^ *cp2++) & *cp3) 1151 break; 1152 } 1153 if (cp3 == cplim) 1154 return ifa; 1155 } 1156 return ifa_maybe; 1157 } 1158 1159 /* 1160 * Default action when installing a route with a Link Level gateway. 1161 * Lookup an appropriate real ifa to point to. 1162 * This should be moved to /sys/net/link.c eventually. 1163 */ 1164 void 1165 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1166 { 1167 struct ifaddr *ifa; 1168 const struct sockaddr *dst; 1169 struct ifnet *ifp; 1170 1171 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == NULL) || 1172 ((ifp = ifa->ifa_ifp) == NULL) || ((dst = rt_getkey(rt)) == NULL)) 1173 return; 1174 if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) { 1175 rt_replace_ifa(rt, ifa); 1176 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1177 ifa->ifa_rtrequest(cmd, rt, info); 1178 } 1179 } 1180 1181 /* 1182 * Handle a change in the interface link state. 1183 */ 1184 void 1185 if_link_state_change(struct ifnet *ifp, int link_state) 1186 { 1187 if (ifp->if_link_state == link_state) 1188 return; 1189 ifp->if_link_state = link_state; 1190 /* Notify that the link state has changed. */ 1191 rt_ifmsg(ifp); 1192 #if NCARP > 0 1193 if (ifp->if_carp) 1194 carp_carpdev_state(ifp); 1195 #endif 1196 } 1197 1198 /* 1199 * Mark an interface down and notify protocols of 1200 * the transition. 1201 * NOTE: must be called at splsoftnet or equivalent. 1202 */ 1203 void 1204 if_down(struct ifnet *ifp) 1205 { 1206 struct ifaddr *ifa; 1207 1208 ifp->if_flags &= ~IFF_UP; 1209 microtime(&ifp->if_lastchange); 1210 IFADDR_FOREACH(ifa, ifp) 1211 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1212 IFQ_PURGE(&ifp->if_snd); 1213 #if NCARP > 0 1214 if (ifp->if_carp) 1215 carp_carpdev_state(ifp); 1216 #endif 1217 rt_ifmsg(ifp); 1218 } 1219 1220 /* 1221 * Mark an interface up and notify protocols of 1222 * the transition. 1223 * NOTE: must be called at splsoftnet or equivalent. 1224 */ 1225 void 1226 if_up(struct ifnet *ifp) 1227 { 1228 #ifdef notyet 1229 struct ifaddr *ifa; 1230 #endif 1231 1232 ifp->if_flags |= IFF_UP; 1233 microtime(&ifp->if_lastchange); 1234 #ifdef notyet 1235 /* this has no effect on IP, and will kill all ISO connections XXX */ 1236 IFADDR_FOREACH(ifa, ifp) 1237 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1238 #endif 1239 #if NCARP > 0 1240 if (ifp->if_carp) 1241 carp_carpdev_state(ifp); 1242 #endif 1243 rt_ifmsg(ifp); 1244 #ifdef INET6 1245 in6_if_up(ifp); 1246 #endif 1247 } 1248 1249 /* 1250 * Handle interface watchdog timer routines. Called 1251 * from softclock, we decrement timers (if set) and 1252 * call the appropriate interface routine on expiration. 1253 */ 1254 void 1255 if_slowtimo(void *arg) 1256 { 1257 struct ifnet *ifp; 1258 int s = splnet(); 1259 1260 IFNET_FOREACH(ifp) { 1261 if (ifp->if_timer == 0 || --ifp->if_timer) 1262 continue; 1263 if (ifp->if_watchdog != NULL) 1264 (*ifp->if_watchdog)(ifp); 1265 } 1266 splx(s); 1267 callout_reset(&if_slowtimo_ch, hz / IFNET_SLOWHZ, if_slowtimo, NULL); 1268 } 1269 1270 /* 1271 * Set/clear promiscuous mode on interface ifp based on the truth value 1272 * of pswitch. The calls are reference counted so that only the first 1273 * "on" request actually has an effect, as does the final "off" request. 1274 * Results are undefined if the "off" and "on" requests are not matched. 1275 */ 1276 int 1277 ifpromisc(struct ifnet *ifp, int pswitch) 1278 { 1279 int pcount, ret; 1280 short flags; 1281 struct ifreq ifr; 1282 1283 pcount = ifp->if_pcount; 1284 flags = ifp->if_flags; 1285 if (pswitch) { 1286 /* 1287 * Allow the device to be "placed" into promiscuous 1288 * mode even if it is not configured up. It will 1289 * consult IFF_PROMISC when it is is brought up. 1290 */ 1291 if (ifp->if_pcount++ != 0) 1292 return 0; 1293 ifp->if_flags |= IFF_PROMISC; 1294 if ((ifp->if_flags & IFF_UP) == 0) 1295 return 0; 1296 } else { 1297 if (--ifp->if_pcount > 0) 1298 return 0; 1299 ifp->if_flags &= ~IFF_PROMISC; 1300 /* 1301 * If the device is not configured up, we should not need to 1302 * turn off promiscuous mode (device should have turned it 1303 * off when interface went down; and will look at IFF_PROMISC 1304 * again next time interface comes up). 1305 */ 1306 if ((ifp->if_flags & IFF_UP) == 0) 1307 return 0; 1308 } 1309 memset(&ifr, 0, sizeof(ifr)); 1310 ifr.ifr_flags = ifp->if_flags; 1311 ret = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (void *) &ifr); 1312 /* Restore interface state if not successful. */ 1313 if (ret != 0) { 1314 ifp->if_pcount = pcount; 1315 ifp->if_flags = flags; 1316 } 1317 return ret; 1318 } 1319 1320 /* 1321 * Map interface name to 1322 * interface structure pointer. 1323 */ 1324 struct ifnet * 1325 ifunit(const char *name) 1326 { 1327 struct ifnet *ifp; 1328 const char *cp = name; 1329 u_int unit = 0; 1330 u_int i; 1331 1332 /* 1333 * If the entire name is a number, treat it as an ifindex. 1334 */ 1335 for (i = 0; i < IFNAMSIZ && *cp >= '0' && *cp <= '9'; i++, cp++) { 1336 unit = unit * 10 + (*cp - '0'); 1337 } 1338 1339 /* 1340 * If the number took all of the name, then it's a valid ifindex. 1341 */ 1342 if (i == IFNAMSIZ || (cp != name && *cp == '\0')) { 1343 if (unit >= if_indexlim) 1344 return NULL; 1345 ifp = ifindex2ifnet[unit]; 1346 if (ifp == NULL || ifp->if_output == if_nulloutput) 1347 return NULL; 1348 return ifp; 1349 } 1350 1351 IFNET_FOREACH(ifp) { 1352 if (ifp->if_output == if_nulloutput) 1353 continue; 1354 if (strcmp(ifp->if_xname, name) == 0) 1355 return ifp; 1356 } 1357 return NULL; 1358 } 1359 1360 /* common */ 1361 int 1362 ifioctl_common(struct ifnet *ifp, u_long cmd, void *data) 1363 { 1364 int s; 1365 struct ifreq *ifr; 1366 struct ifcapreq *ifcr; 1367 struct ifdatareq *ifdr; 1368 1369 switch (cmd) { 1370 case SIOCSIFCAP: 1371 ifcr = data; 1372 if ((ifcr->ifcr_capenable & ~ifp->if_capabilities) != 0) 1373 return EINVAL; 1374 1375 if (ifcr->ifcr_capenable == ifp->if_capenable) 1376 return 0; 1377 1378 ifp->if_capenable = ifcr->ifcr_capenable; 1379 1380 /* Pre-compute the checksum flags mask. */ 1381 ifp->if_csum_flags_tx = 0; 1382 ifp->if_csum_flags_rx = 0; 1383 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Tx) { 1384 ifp->if_csum_flags_tx |= M_CSUM_IPv4; 1385 } 1386 if (ifp->if_capenable & IFCAP_CSUM_IPv4_Rx) { 1387 ifp->if_csum_flags_rx |= M_CSUM_IPv4; 1388 } 1389 1390 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Tx) { 1391 ifp->if_csum_flags_tx |= M_CSUM_TCPv4; 1392 } 1393 if (ifp->if_capenable & IFCAP_CSUM_TCPv4_Rx) { 1394 ifp->if_csum_flags_rx |= M_CSUM_TCPv4; 1395 } 1396 1397 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Tx) { 1398 ifp->if_csum_flags_tx |= M_CSUM_UDPv4; 1399 } 1400 if (ifp->if_capenable & IFCAP_CSUM_UDPv4_Rx) { 1401 ifp->if_csum_flags_rx |= M_CSUM_UDPv4; 1402 } 1403 1404 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Tx) { 1405 ifp->if_csum_flags_tx |= M_CSUM_TCPv6; 1406 } 1407 if (ifp->if_capenable & IFCAP_CSUM_TCPv6_Rx) { 1408 ifp->if_csum_flags_rx |= M_CSUM_TCPv6; 1409 } 1410 1411 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Tx) { 1412 ifp->if_csum_flags_tx |= M_CSUM_UDPv6; 1413 } 1414 if (ifp->if_capenable & IFCAP_CSUM_UDPv6_Rx) { 1415 ifp->if_csum_flags_rx |= M_CSUM_UDPv6; 1416 } 1417 if (ifp->if_flags & IFF_UP) 1418 return ENETRESET; 1419 return 0; 1420 case SIOCSIFFLAGS: 1421 ifr = data; 1422 if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) { 1423 s = splnet(); 1424 if_down(ifp); 1425 splx(s); 1426 } 1427 if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) { 1428 s = splnet(); 1429 if_up(ifp); 1430 splx(s); 1431 } 1432 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1433 (ifr->ifr_flags &~ IFF_CANTCHANGE); 1434 break; 1435 case SIOCGIFFLAGS: 1436 ifr = data; 1437 ifr->ifr_flags = ifp->if_flags; 1438 break; 1439 1440 case SIOCGIFMETRIC: 1441 ifr = data; 1442 ifr->ifr_metric = ifp->if_metric; 1443 break; 1444 1445 case SIOCGIFMTU: 1446 ifr = data; 1447 ifr->ifr_mtu = ifp->if_mtu; 1448 break; 1449 1450 case SIOCGIFDLT: 1451 ifr = data; 1452 ifr->ifr_dlt = ifp->if_dlt; 1453 break; 1454 1455 case SIOCGIFCAP: 1456 ifcr = data; 1457 ifcr->ifcr_capabilities = ifp->if_capabilities; 1458 ifcr->ifcr_capenable = ifp->if_capenable; 1459 break; 1460 1461 case SIOCSIFMETRIC: 1462 ifr = data; 1463 ifp->if_metric = ifr->ifr_metric; 1464 break; 1465 1466 case SIOCGIFDATA: 1467 ifdr = data; 1468 ifdr->ifdr_data = ifp->if_data; 1469 break; 1470 1471 case SIOCZIFDATA: 1472 ifdr = data; 1473 ifdr->ifdr_data = ifp->if_data; 1474 /* 1475 * Assumes that the volatile counters that can be 1476 * zero'ed are at the end of if_data. 1477 */ 1478 memset(&ifp->if_data.ifi_ipackets, 0, sizeof(ifp->if_data) - 1479 offsetof(struct if_data, ifi_ipackets)); 1480 break; 1481 case SIOCSIFMTU: 1482 ifr = data; 1483 if (ifp->if_mtu == ifr->ifr_mtu) 1484 break; 1485 ifp->if_mtu = ifr->ifr_mtu; 1486 /* 1487 * If the link MTU changed, do network layer specific procedure. 1488 */ 1489 #ifdef INET6 1490 nd6_setmtu(ifp); 1491 #endif 1492 return ENETRESET; 1493 default: 1494 return EOPNOTSUPP; 1495 } 1496 return 0; 1497 } 1498 1499 /* 1500 * Interface ioctls. 1501 */ 1502 int 1503 ifioctl(struct socket *so, u_long cmd, void *data, struct lwp *l) 1504 { 1505 struct ifnet *ifp; 1506 struct ifreq *ifr; 1507 struct ifcapreq *ifcr; 1508 struct ifdatareq *ifdr; 1509 int error = 0; 1510 #if defined(COMPAT_OSOCK) || defined(COMPAT_OIFREQ) 1511 u_long ocmd = cmd; 1512 #endif 1513 short oif_flags; 1514 #ifdef COMPAT_OIFREQ 1515 struct ifreq ifrb; 1516 struct oifreq *oifr = NULL; 1517 #endif 1518 1519 switch (cmd) { 1520 #ifdef COMPAT_OIFREQ 1521 case OSIOCGIFCONF: 1522 case OOSIOCGIFCONF: 1523 return compat_ifconf(cmd, data); 1524 #endif 1525 case SIOCGIFCONF: 1526 return ifconf(cmd, data); 1527 } 1528 1529 #ifdef COMPAT_OIFREQ 1530 cmd = compat_cvtcmd(cmd); 1531 if (cmd != ocmd) { 1532 oifr = data; 1533 data = ifr = &ifrb; 1534 ifreqo2n(oifr, ifr); 1535 } else 1536 #endif 1537 ifr = data; 1538 ifcr = data; 1539 ifdr = data; 1540 1541 ifp = ifunit(ifr->ifr_name); 1542 1543 switch (cmd) { 1544 case SIOCIFCREATE: 1545 case SIOCIFDESTROY: 1546 if (l != NULL) { 1547 error = kauth_authorize_network(l->l_cred, 1548 KAUTH_NETWORK_INTERFACE, 1549 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1550 (void *)cmd, NULL); 1551 if (error != 0) 1552 return error; 1553 } 1554 return (cmd == SIOCIFCREATE) ? 1555 if_clone_create(ifr->ifr_name) : 1556 if_clone_destroy(ifr->ifr_name); 1557 1558 case SIOCIFGCLONERS: 1559 return if_clone_list((struct if_clonereq *)data); 1560 } 1561 1562 if (ifp == NULL) 1563 return ENXIO; 1564 1565 switch (cmd) { 1566 case SIOCSIFFLAGS: 1567 case SIOCSIFCAP: 1568 case SIOCSIFMETRIC: 1569 case SIOCZIFDATA: 1570 case SIOCSIFMTU: 1571 case SIOCSIFPHYADDR: 1572 case SIOCDIFPHYADDR: 1573 #ifdef INET6 1574 case SIOCSIFPHYADDR_IN6: 1575 #endif 1576 case SIOCSLIFPHYADDR: 1577 case SIOCADDMULTI: 1578 case SIOCDELMULTI: 1579 case SIOCSIFMEDIA: 1580 case SIOCSDRVSPEC: 1581 case SIOCG80211: 1582 case SIOCS80211: 1583 case SIOCS80211NWID: 1584 case SIOCS80211NWKEY: 1585 case SIOCS80211POWER: 1586 case SIOCS80211BSSID: 1587 case SIOCS80211CHANNEL: 1588 if (l != NULL) { 1589 error = kauth_authorize_network(l->l_cred, 1590 KAUTH_NETWORK_INTERFACE, 1591 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, 1592 (void *)cmd, NULL); 1593 if (error != 0) 1594 return error; 1595 } 1596 } 1597 1598 oif_flags = ifp->if_flags; 1599 switch (cmd) { 1600 1601 case SIOCSIFFLAGS: 1602 ifioctl_common(ifp, cmd, data); 1603 if (ifp->if_ioctl) 1604 (void)(*ifp->if_ioctl)(ifp, cmd, data); 1605 break; 1606 1607 case SIOCSIFPHYADDR: 1608 case SIOCDIFPHYADDR: 1609 #ifdef INET6 1610 case SIOCSIFPHYADDR_IN6: 1611 #endif 1612 case SIOCSLIFPHYADDR: 1613 case SIOCADDMULTI: 1614 case SIOCDELMULTI: 1615 case SIOCSIFMEDIA: 1616 case SIOCGIFPSRCADDR: 1617 case SIOCGIFPDSTADDR: 1618 case SIOCGLIFPHYADDR: 1619 case SIOCGIFMEDIA: 1620 case SIOCG80211: 1621 case SIOCS80211: 1622 case SIOCS80211NWID: 1623 case SIOCS80211NWKEY: 1624 case SIOCS80211POWER: 1625 case SIOCS80211BSSID: 1626 case SIOCS80211CHANNEL: 1627 case SIOCSIFCAP: 1628 case SIOCSIFMTU: 1629 if (ifp->if_ioctl == NULL) 1630 return EOPNOTSUPP; 1631 error = (*ifp->if_ioctl)(ifp, cmd, data); 1632 break; 1633 1634 default: 1635 error = ifioctl_common(ifp, cmd, data); 1636 if (error != EOPNOTSUPP) 1637 break; 1638 if (so->so_proto == NULL) 1639 return EOPNOTSUPP; 1640 solock(so); 1641 #ifdef COMPAT_OSOCK 1642 error = compat_ifioctl(so, ocmd, cmd, data, l); 1643 #else 1644 error = (*so->so_proto->pr_usrreq)(so, PRU_CONTROL, 1645 (struct mbuf *)cmd, (struct mbuf *)data, 1646 (struct mbuf *)ifp, l); 1647 #endif 1648 sounlock(so); 1649 break; 1650 } 1651 1652 if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) { 1653 #ifdef INET6 1654 if ((ifp->if_flags & IFF_UP) != 0) { 1655 int s = splnet(); 1656 in6_if_up(ifp); 1657 splx(s); 1658 } 1659 #endif 1660 } 1661 #ifdef COMPAT_OIFREQ 1662 if (cmd != ocmd) 1663 ifreqn2o(oifr, ifr); 1664 #endif 1665 1666 return error; 1667 } 1668 1669 /* 1670 * Return interface configuration 1671 * of system. List may be used 1672 * in later ioctl's (above) to get 1673 * other information. 1674 * 1675 * Each record is a struct ifreq. Before the addition of 1676 * sockaddr_storage, the API rule was that sockaddr flavors that did 1677 * not fit would extend beyond the struct ifreq, with the next struct 1678 * ifreq starting sa_len beyond the struct sockaddr. Because the 1679 * union in struct ifreq includes struct sockaddr_storage, every kind 1680 * of sockaddr must fit. Thus, there are no longer any overlength 1681 * records. 1682 * 1683 * Records are added to the user buffer if they fit, and ifc_len is 1684 * adjusted to the length that was written. Thus, the user is only 1685 * assured of getting the complete list if ifc_len on return is at 1686 * least sizeof(struct ifreq) less than it was on entry. 1687 * 1688 * If the user buffer pointer is NULL, this routine copies no data and 1689 * returns the amount of space that would be needed. 1690 * 1691 * Invariants: 1692 * ifrp points to the next part of the user's buffer to be used. If 1693 * ifrp != NULL, space holds the number of bytes remaining that we may 1694 * write at ifrp. Otherwise, space holds the number of bytes that 1695 * would have been written had there been adequate space. 1696 */ 1697 /*ARGSUSED*/ 1698 int 1699 ifconf(u_long cmd, void *data) 1700 { 1701 struct ifconf *ifc = (struct ifconf *)data; 1702 struct ifnet *ifp; 1703 struct ifaddr *ifa; 1704 struct ifreq ifr, *ifrp; 1705 int space, error = 0; 1706 const int sz = (int)sizeof(struct ifreq); 1707 1708 if ((ifrp = ifc->ifc_req) == NULL) 1709 space = 0; 1710 else 1711 space = ifc->ifc_len; 1712 IFNET_FOREACH(ifp) { 1713 (void)strncpy(ifr.ifr_name, ifp->if_xname, 1714 sizeof(ifr.ifr_name)); 1715 if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') 1716 return ENAMETOOLONG; 1717 if (IFADDR_EMPTY(ifp)) { 1718 /* Interface with no addresses - send zero sockaddr. */ 1719 memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr)); 1720 if (ifrp == NULL) { 1721 space += sz; 1722 continue; 1723 } 1724 if (space >= sz) { 1725 error = copyout(&ifr, ifrp, sz); 1726 if (error != 0) 1727 return error; 1728 ifrp++; 1729 space -= sz; 1730 } 1731 } 1732 1733 IFADDR_FOREACH(ifa, ifp) { 1734 struct sockaddr *sa = ifa->ifa_addr; 1735 /* all sockaddrs must fit in sockaddr_storage */ 1736 KASSERT(sa->sa_len <= sizeof(ifr.ifr_ifru)); 1737 1738 if (ifrp == NULL) { 1739 space += sz; 1740 continue; 1741 } 1742 memcpy(&ifr.ifr_space, sa, sa->sa_len); 1743 if (space >= sz) { 1744 error = copyout(&ifr, ifrp, sz); 1745 if (error != 0) 1746 return (error); 1747 ifrp++; space -= sz; 1748 } 1749 } 1750 } 1751 if (ifrp != NULL) { 1752 KASSERT(0 <= space && space <= ifc->ifc_len); 1753 ifc->ifc_len -= space; 1754 } else { 1755 KASSERT(space >= 0); 1756 ifc->ifc_len = space; 1757 } 1758 return (0); 1759 } 1760 1761 int 1762 ifreq_setaddr(const u_long cmd, struct ifreq *ifr, const struct sockaddr *sa) 1763 { 1764 uint8_t len; 1765 u_long ncmd; 1766 const uint8_t osockspace = sizeof(ifr->ifr_addr); 1767 const uint8_t sockspace = sizeof(ifr->ifr_ifru.ifru_space); 1768 1769 #ifdef INET6 1770 if (cmd == SIOCGIFPSRCADDR_IN6 || cmd == SIOCGIFPDSTADDR_IN6) 1771 len = MIN(sizeof(struct sockaddr_in6), sa->sa_len); 1772 else 1773 #endif /* INET6 */ 1774 if ((ncmd = compat_cvtcmd(cmd)) != cmd) 1775 len = MIN(osockspace, sa->sa_len); 1776 else 1777 len = MIN(sockspace, sa->sa_len); 1778 if (len < sa->sa_len) 1779 return EFBIG; 1780 sockaddr_copy(&ifr->ifr_addr, len, sa); 1781 return 0; 1782 } 1783 1784 /* 1785 * Queue message on interface, and start output if interface 1786 * not yet active. 1787 */ 1788 int 1789 ifq_enqueue(struct ifnet *ifp, struct mbuf *m 1790 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 1791 { 1792 int len = m->m_pkthdr.len; 1793 int mflags = m->m_flags; 1794 int s = splnet(); 1795 int error; 1796 1797 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 1798 if (error != 0) 1799 goto out; 1800 ifp->if_obytes += len; 1801 if (mflags & M_MCAST) 1802 ifp->if_omcasts++; 1803 if ((ifp->if_flags & IFF_OACTIVE) == 0) 1804 (*ifp->if_start)(ifp); 1805 out: 1806 splx(s); 1807 return error; 1808 } 1809 1810 /* 1811 * Queue message on interface, possibly using a second fast queue 1812 */ 1813 int 1814 ifq_enqueue2(struct ifnet *ifp, struct ifqueue *ifq, struct mbuf *m 1815 ALTQ_COMMA ALTQ_DECL(struct altq_pktattr *pktattr)) 1816 { 1817 int error = 0; 1818 1819 if (ifq != NULL 1820 #ifdef ALTQ 1821 && ALTQ_IS_ENABLED(&ifp->if_snd) == 0 1822 #endif 1823 ) { 1824 if (IF_QFULL(ifq)) { 1825 IF_DROP(&ifp->if_snd); 1826 m_freem(m); 1827 if (error == 0) 1828 error = ENOBUFS; 1829 } else 1830 IF_ENQUEUE(ifq, m); 1831 } else 1832 IFQ_ENQUEUE(&ifp->if_snd, m, pktattr, error); 1833 if (error != 0) { 1834 ++ifp->if_oerrors; 1835 return error; 1836 } 1837 return 0; 1838 } 1839 1840 1841 #if defined(INET) || defined(INET6) 1842 static void 1843 sysctl_net_ifq_setup(struct sysctllog **clog, 1844 int pf, const char *pfname, 1845 int ipn, const char *ipname, 1846 int qid, struct ifqueue *ifq) 1847 { 1848 1849 sysctl_createv(clog, 0, NULL, NULL, 1850 CTLFLAG_PERMANENT, 1851 CTLTYPE_NODE, "net", NULL, 1852 NULL, 0, NULL, 0, 1853 CTL_NET, CTL_EOL); 1854 sysctl_createv(clog, 0, NULL, NULL, 1855 CTLFLAG_PERMANENT, 1856 CTLTYPE_NODE, pfname, NULL, 1857 NULL, 0, NULL, 0, 1858 CTL_NET, pf, CTL_EOL); 1859 sysctl_createv(clog, 0, NULL, NULL, 1860 CTLFLAG_PERMANENT, 1861 CTLTYPE_NODE, ipname, NULL, 1862 NULL, 0, NULL, 0, 1863 CTL_NET, pf, ipn, CTL_EOL); 1864 sysctl_createv(clog, 0, NULL, NULL, 1865 CTLFLAG_PERMANENT, 1866 CTLTYPE_NODE, "ifq", 1867 SYSCTL_DESCR("Protocol input queue controls"), 1868 NULL, 0, NULL, 0, 1869 CTL_NET, pf, ipn, qid, CTL_EOL); 1870 1871 sysctl_createv(clog, 0, NULL, NULL, 1872 CTLFLAG_PERMANENT, 1873 CTLTYPE_INT, "len", 1874 SYSCTL_DESCR("Current input queue length"), 1875 NULL, 0, &ifq->ifq_len, 0, 1876 CTL_NET, pf, ipn, qid, IFQCTL_LEN, CTL_EOL); 1877 sysctl_createv(clog, 0, NULL, NULL, 1878 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1879 CTLTYPE_INT, "maxlen", 1880 SYSCTL_DESCR("Maximum allowed input queue length"), 1881 NULL, 0, &ifq->ifq_maxlen, 0, 1882 CTL_NET, pf, ipn, qid, IFQCTL_MAXLEN, CTL_EOL); 1883 #ifdef notyet 1884 sysctl_createv(clog, 0, NULL, NULL, 1885 CTLFLAG_PERMANENT, 1886 CTLTYPE_INT, "peak", 1887 SYSCTL_DESCR("Highest input queue length"), 1888 NULL, 0, &ifq->ifq_peak, 0, 1889 CTL_NET, pf, ipn, qid, IFQCTL_PEAK, CTL_EOL); 1890 #endif 1891 sysctl_createv(clog, 0, NULL, NULL, 1892 CTLFLAG_PERMANENT, 1893 CTLTYPE_INT, "drops", 1894 SYSCTL_DESCR("Packets dropped due to full input queue"), 1895 NULL, 0, &ifq->ifq_drops, 0, 1896 CTL_NET, pf, ipn, qid, IFQCTL_DROPS, CTL_EOL); 1897 } 1898 1899 #ifdef INET 1900 SYSCTL_SETUP(sysctl_net_inet_ip_ifq_setup, 1901 "sysctl net.inet.ip.ifq subtree setup") 1902 { 1903 extern struct ifqueue ipintrq; 1904 1905 sysctl_net_ifq_setup(clog, PF_INET, "inet", IPPROTO_IP, "ip", 1906 IPCTL_IFQ, &ipintrq); 1907 } 1908 #endif /* INET */ 1909 1910 #ifdef INET6 1911 SYSCTL_SETUP(sysctl_net_inet6_ip6_ifq_setup, 1912 "sysctl net.inet6.ip6.ifq subtree setup") 1913 { 1914 extern struct ifqueue ip6intrq; 1915 1916 sysctl_net_ifq_setup(clog, PF_INET6, "inet6", IPPROTO_IPV6, "ip6", 1917 IPV6CTL_IFQ, &ip6intrq); 1918 } 1919 #endif /* INET6 */ 1920 #endif /* INET || INET6 */ 1921