1 /* 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)if.c 8.5 (Berkeley) 1/9/95 30 * $FreeBSD$ 31 */ 32 33 #include "opt_compat.h" 34 #include "opt_inet6.h" 35 #include "opt_inet.h" 36 #include "opt_mac.h" 37 38 #include <sys/param.h> 39 #include <sys/conf.h> 40 #include <sys/mac.h> 41 #include <sys/malloc.h> 42 #include <sys/bus.h> 43 #include <sys/mbuf.h> 44 #include <sys/systm.h> 45 #include <sys/proc.h> 46 #include <sys/socket.h> 47 #include <sys/socketvar.h> 48 #include <sys/protosw.h> 49 #include <sys/kernel.h> 50 #include <sys/sockio.h> 51 #include <sys/syslog.h> 52 #include <sys/sysctl.h> 53 #include <sys/domain.h> 54 #include <sys/jail.h> 55 #include <machine/stdarg.h> 56 57 #include <net/if.h> 58 #include <net/if_arp.h> 59 #include <net/if_clone.h> 60 #include <net/if_dl.h> 61 #include <net/if_types.h> 62 #include <net/if_var.h> 63 #include <net/radix.h> 64 #include <net/route.h> 65 66 #if defined(INET) || defined(INET6) 67 /*XXX*/ 68 #include <netinet/in.h> 69 #include <netinet/in_var.h> 70 #ifdef INET6 71 #include <netinet6/in6_var.h> 72 #include <netinet6/in6_ifattach.h> 73 #endif 74 #endif 75 #ifdef INET 76 #include <netinet/if_ether.h> 77 #endif 78 79 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 80 81 static void if_attachdomain(void *); 82 static void if_attachdomain1(struct ifnet *); 83 static int ifconf(u_long, caddr_t); 84 static void if_grow(void); 85 static void if_init(void *); 86 static void if_check(void *); 87 static int if_findindex(struct ifnet *); 88 static void if_qflush(struct ifaltq *); 89 static void if_route(struct ifnet *, int flag, int fam); 90 static void if_slowtimo(void *); 91 static void if_unroute(struct ifnet *, int flag, int fam); 92 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 93 static int if_rtdel(struct radix_node *, void *); 94 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 95 #ifdef INET6 96 /* 97 * XXX: declare here to avoid to include many inet6 related files.. 98 * should be more generalized? 99 */ 100 extern void nd6_setmtu(struct ifnet *); 101 #endif 102 103 int if_index = 0; 104 struct ifindex_entry *ifindex_table = NULL; 105 int ifqmaxlen = IFQ_MAXLEN; 106 struct ifnethead ifnet; /* depend on static init XXX */ 107 struct mtx ifnet_lock; 108 109 static int if_indexlim = 8; 110 static struct klist ifklist; 111 112 static void filt_netdetach(struct knote *kn); 113 static int filt_netdev(struct knote *kn, long hint); 114 115 static struct filterops netdev_filtops = 116 { 1, NULL, filt_netdetach, filt_netdev }; 117 118 /* 119 * System initialization 120 */ 121 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 122 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 123 124 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 125 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 126 127 static d_open_t netopen; 128 static d_close_t netclose; 129 static d_ioctl_t netioctl; 130 static d_kqfilter_t netkqfilter; 131 132 static struct cdevsw net_cdevsw = { 133 .d_version = D_VERSION, 134 .d_flags = D_NEEDGIANT, 135 .d_open = netopen, 136 .d_close = netclose, 137 .d_ioctl = netioctl, 138 .d_name = "net", 139 .d_kqfilter = netkqfilter, 140 }; 141 142 static int 143 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 144 { 145 return (0); 146 } 147 148 static int 149 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 150 { 151 return (0); 152 } 153 154 static int 155 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 156 { 157 struct ifnet *ifp; 158 int error, idx; 159 160 /* only support interface specific ioctls */ 161 if (IOCGROUP(cmd) != 'i') 162 return (EOPNOTSUPP); 163 idx = minor(dev); 164 if (idx == 0) { 165 /* 166 * special network device, not interface. 167 */ 168 if (cmd == SIOCGIFCONF) 169 return (ifconf(cmd, data)); /* XXX remove cmd */ 170 return (EOPNOTSUPP); 171 } 172 173 ifp = ifnet_byindex(idx); 174 if (ifp == NULL) 175 return (ENXIO); 176 177 error = ifhwioctl(cmd, ifp, data, td); 178 if (error == ENOIOCTL) 179 error = EOPNOTSUPP; 180 return (error); 181 } 182 183 static int 184 netkqfilter(struct cdev *dev, struct knote *kn) 185 { 186 struct klist *klist; 187 struct ifnet *ifp; 188 int idx; 189 190 idx = minor(dev); 191 if (idx == 0) { 192 klist = &ifklist; 193 } else { 194 ifp = ifnet_byindex(idx); 195 if (ifp == NULL) 196 return (1); 197 klist = &ifp->if_klist; 198 } 199 200 switch (kn->kn_filter) { 201 case EVFILT_NETDEV: 202 kn->kn_fop = &netdev_filtops; 203 break; 204 default: 205 return (1); 206 } 207 208 kn->kn_hook = (caddr_t)klist; 209 210 /* XXX locking? */ 211 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 212 213 return (0); 214 } 215 216 static void 217 filt_netdetach(struct knote *kn) 218 { 219 struct klist *klist = (struct klist *)kn->kn_hook; 220 221 if (kn->kn_status & KN_DETACHED) 222 return; 223 SLIST_REMOVE(klist, kn, knote, kn_selnext); 224 } 225 226 static int 227 filt_netdev(struct knote *kn, long hint) 228 { 229 230 /* 231 * Currently NOTE_EXIT is abused to indicate device detach. 232 */ 233 if (hint == NOTE_EXIT) { 234 kn->kn_data = NOTE_LINKINV; 235 kn->kn_status |= KN_DETACHED; 236 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 237 return (1); 238 } 239 kn->kn_data = hint; /* current status */ 240 if (kn->kn_sfflags & hint) 241 kn->kn_fflags |= hint; 242 return (kn->kn_fflags != 0); 243 } 244 245 /* 246 * Network interface utility routines. 247 * 248 * Routines with ifa_ifwith* names take sockaddr *'s as 249 * parameters. 250 */ 251 /* ARGSUSED*/ 252 static void 253 if_init(void *dummy __unused) 254 { 255 256 IFNET_LOCK_INIT(); 257 TAILQ_INIT(&ifnet); 258 SLIST_INIT(&ifklist); 259 if_grow(); /* create initial table */ 260 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 261 UID_ROOT, GID_WHEEL, 0600, "network"); 262 if_clone_init(); 263 } 264 265 static void 266 if_grow(void) 267 { 268 u_int n; 269 struct ifindex_entry *e; 270 271 if_indexlim <<= 1; 272 n = if_indexlim * sizeof(*e); 273 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 274 if (ifindex_table != NULL) { 275 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 276 free((caddr_t)ifindex_table, M_IFADDR); 277 } 278 ifindex_table = e; 279 } 280 281 /* ARGSUSED*/ 282 static void 283 if_check(void *dummy __unused) 284 { 285 struct ifnet *ifp; 286 int s; 287 288 s = splimp(); 289 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 290 TAILQ_FOREACH(ifp, &ifnet, if_link) { 291 if (ifp->if_snd.ifq_maxlen == 0) { 292 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 293 ifp->if_snd.ifq_maxlen = ifqmaxlen; 294 } 295 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 296 if_printf(ifp, 297 "XXX: driver didn't initialize queue mtx\n"); 298 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 299 MTX_NETWORK_LOCK, MTX_DEF); 300 } 301 } 302 IFNET_RUNLOCK(); 303 splx(s); 304 if_slowtimo(0); 305 } 306 307 static int 308 if_findindex(struct ifnet *ifp) 309 { 310 int i, unit; 311 char eaddr[18], devname[32]; 312 const char *name, *p; 313 314 switch (ifp->if_type) { 315 case IFT_ETHER: /* these types use struct arpcom */ 316 case IFT_FDDI: 317 case IFT_XETHER: 318 case IFT_ISO88025: 319 case IFT_L2VLAN: 320 snprintf(eaddr, 18, "%6D", 321 IFP2AC(ifp)->ac_enaddr, ":"); 322 break; 323 default: 324 eaddr[0] = '\0'; 325 break; 326 } 327 strlcpy(devname, ifp->if_xname, sizeof(devname)); 328 name = net_cdevsw.d_name; 329 i = 0; 330 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 331 if (resource_string_value(name, unit, "ether", &p) == 0) 332 if (strcmp(p, eaddr) == 0) 333 goto found; 334 if (resource_string_value(name, unit, "dev", &p) == 0) 335 if (strcmp(p, devname) == 0) 336 goto found; 337 } 338 unit = 0; 339 found: 340 if (unit != 0) { 341 if (ifaddr_byindex(unit) == NULL) 342 return (unit); 343 printf("%s%d in use, cannot hardwire it to %s.\n", 344 name, unit, devname); 345 } 346 for (unit = 1; ; unit++) { 347 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 348 continue; 349 if (resource_string_value(name, unit, "ether", &p) == 0 || 350 resource_string_value(name, unit, "dev", &p) == 0) 351 continue; 352 break; 353 } 354 return (unit); 355 } 356 357 /* 358 * Attach an interface to the 359 * list of "active" interfaces. 360 */ 361 void 362 if_attach(struct ifnet *ifp) 363 { 364 unsigned socksize, ifasize; 365 int namelen, masklen; 366 struct sockaddr_dl *sdl; 367 struct ifaddr *ifa; 368 369 IF_AFDATA_LOCK_INIT(ifp); 370 ifp->if_afdata_initialized = 0; 371 IFNET_WLOCK(); 372 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 373 IFNET_WUNLOCK(); 374 /* 375 * XXX - 376 * The old code would work if the interface passed a pre-existing 377 * chain of ifaddrs to this code. We don't trust our callers to 378 * properly initialize the tailq, however, so we no longer allow 379 * this unlikely case. 380 */ 381 TAILQ_INIT(&ifp->if_addrhead); 382 TAILQ_INIT(&ifp->if_prefixhead); 383 TAILQ_INIT(&ifp->if_multiaddrs); 384 SLIST_INIT(&ifp->if_klist); 385 getmicrotime(&ifp->if_lastchange); 386 387 #ifdef MAC 388 mac_init_ifnet(ifp); 389 mac_create_ifnet(ifp); 390 #endif 391 392 ifp->if_index = if_findindex(ifp); 393 if (ifp->if_index > if_index) 394 if_index = ifp->if_index; 395 if (if_index >= if_indexlim) 396 if_grow(); 397 398 ifnet_byindex(ifp->if_index) = ifp; 399 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 400 unit2minor(ifp->if_index), 401 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 402 net_cdevsw.d_name, ifp->if_xname); 403 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 404 net_cdevsw.d_name, ifp->if_index); 405 406 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 407 408 /* 409 * create a Link Level name for this device 410 */ 411 namelen = strlen(ifp->if_xname); 412 /* 413 * Always save enough space for any possiable name so we can do 414 * a rename in place later. 415 */ 416 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 417 socksize = masklen + ifp->if_addrlen; 418 if (socksize < sizeof(*sdl)) 419 socksize = sizeof(*sdl); 420 socksize = roundup2(socksize, sizeof(long)); 421 ifasize = sizeof(*ifa) + 2 * socksize; 422 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 423 IFA_LOCK_INIT(ifa); 424 sdl = (struct sockaddr_dl *)(ifa + 1); 425 sdl->sdl_len = socksize; 426 sdl->sdl_family = AF_LINK; 427 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 428 sdl->sdl_nlen = namelen; 429 sdl->sdl_index = ifp->if_index; 430 sdl->sdl_type = ifp->if_type; 431 ifaddr_byindex(ifp->if_index) = ifa; 432 ifa->ifa_ifp = ifp; 433 ifa->ifa_rtrequest = link_rtrequest; 434 ifa->ifa_addr = (struct sockaddr *)sdl; 435 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 436 ifa->ifa_netmask = (struct sockaddr *)sdl; 437 sdl->sdl_len = masklen; 438 while (namelen != 0) 439 sdl->sdl_data[--namelen] = 0xff; 440 ifa->ifa_refcnt = 1; 441 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 442 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 443 ifp->if_snd.altq_type = 0; 444 ifp->if_snd.altq_disc = NULL; 445 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 446 ifp->if_snd.altq_tbr = NULL; 447 ifp->if_snd.altq_ifp = ifp; 448 449 if (domains) 450 if_attachdomain1(ifp); 451 452 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 453 454 /* Announce the interface. */ 455 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 456 } 457 458 static void 459 if_attachdomain(void *dummy) 460 { 461 struct ifnet *ifp; 462 int s; 463 464 s = splnet(); 465 TAILQ_FOREACH(ifp, &ifnet, if_link) 466 if_attachdomain1(ifp); 467 splx(s); 468 } 469 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 470 if_attachdomain, NULL); 471 472 static void 473 if_attachdomain1(struct ifnet *ifp) 474 { 475 struct domain *dp; 476 int s; 477 478 s = splnet(); 479 480 /* 481 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 482 * cannot lock ifp->if_afdata initialization, entirely. 483 */ 484 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 485 splx(s); 486 return; 487 } 488 if (ifp->if_afdata_initialized) { 489 IF_AFDATA_UNLOCK(ifp); 490 splx(s); 491 return; 492 } 493 ifp->if_afdata_initialized = 1; 494 IF_AFDATA_UNLOCK(ifp); 495 496 /* address family dependent data region */ 497 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 498 for (dp = domains; dp; dp = dp->dom_next) { 499 if (dp->dom_ifattach) 500 ifp->if_afdata[dp->dom_family] = 501 (*dp->dom_ifattach)(ifp); 502 } 503 504 splx(s); 505 } 506 507 /* 508 * Detach an interface, removing it from the 509 * list of "active" interfaces. 510 */ 511 void 512 if_detach(struct ifnet *ifp) 513 { 514 struct ifaddr *ifa, *next; 515 struct radix_node_head *rnh; 516 int s; 517 int i; 518 struct domain *dp; 519 520 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 521 /* 522 * Remove routes and flush queues. 523 */ 524 s = splnet(); 525 if_down(ifp); 526 #ifdef ALTQ 527 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 528 altq_disable(&ifp->if_snd); 529 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 530 altq_detach(&ifp->if_snd); 531 #endif 532 533 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) { 534 next = TAILQ_NEXT(ifa, ifa_link); 535 536 if (ifa->ifa_addr->sa_family == AF_LINK) 537 continue; 538 #ifdef INET 539 /* XXX: Ugly!! ad hoc just for INET */ 540 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 541 struct ifaliasreq ifr; 542 543 bzero(&ifr, sizeof(ifr)); 544 ifr.ifra_addr = *ifa->ifa_addr; 545 if (ifa->ifa_dstaddr) 546 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 547 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 548 NULL) == 0) 549 continue; 550 } 551 #endif /* INET */ 552 #ifdef INET6 553 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 554 in6_purgeaddr(ifa); 555 /* ifp_addrhead is already updated */ 556 continue; 557 } 558 #endif /* INET6 */ 559 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 560 IFAFREE(ifa); 561 } 562 563 #ifdef INET6 564 /* 565 * Remove all IPv6 kernel structs related to ifp. This should be done 566 * before removing routing entries below, since IPv6 interface direct 567 * routes are expected to be removed by the IPv6-specific kernel API. 568 * Otherwise, the kernel will detect some inconsistency and bark it. 569 */ 570 in6_ifdetach(ifp); 571 #endif 572 /* 573 * Remove address from ifindex_table[] and maybe decrement if_index. 574 * Clean up all addresses. 575 */ 576 ifaddr_byindex(ifp->if_index) = NULL; 577 destroy_dev(ifdev_byindex(ifp->if_index)); 578 ifdev_byindex(ifp->if_index) = NULL; 579 580 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 581 if_index--; 582 583 584 /* We can now free link ifaddr. */ 585 ifa = TAILQ_FIRST(&ifp->if_addrhead); 586 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 587 IFAFREE(ifa); 588 589 /* 590 * Delete all remaining routes using this interface 591 * Unfortuneatly the only way to do this is to slog through 592 * the entire routing table looking for routes which point 593 * to this interface...oh well... 594 */ 595 for (i = 1; i <= AF_MAX; i++) { 596 if ((rnh = rt_tables[i]) == NULL) 597 continue; 598 RADIX_NODE_HEAD_LOCK(rnh); 599 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 600 RADIX_NODE_HEAD_UNLOCK(rnh); 601 } 602 603 /* Announce that the interface is gone. */ 604 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 605 606 IF_AFDATA_LOCK(ifp); 607 for (dp = domains; dp; dp = dp->dom_next) { 608 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 609 (*dp->dom_ifdetach)(ifp, 610 ifp->if_afdata[dp->dom_family]); 611 } 612 IF_AFDATA_UNLOCK(ifp); 613 614 #ifdef MAC 615 mac_destroy_ifnet(ifp); 616 #endif /* MAC */ 617 KNOTE(&ifp->if_klist, NOTE_EXIT); 618 IFNET_WLOCK(); 619 TAILQ_REMOVE(&ifnet, ifp, if_link); 620 IFNET_WUNLOCK(); 621 mtx_destroy(&ifp->if_snd.ifq_mtx); 622 IF_AFDATA_DESTROY(ifp); 623 splx(s); 624 } 625 626 /* 627 * Delete Routes for a Network Interface 628 * 629 * Called for each routing entry via the rnh->rnh_walktree() call above 630 * to delete all route entries referencing a detaching network interface. 631 * 632 * Arguments: 633 * rn pointer to node in the routing table 634 * arg argument passed to rnh->rnh_walktree() - detaching interface 635 * 636 * Returns: 637 * 0 successful 638 * errno failed - reason indicated 639 * 640 */ 641 static int 642 if_rtdel(struct radix_node *rn, void *arg) 643 { 644 struct rtentry *rt = (struct rtentry *)rn; 645 struct ifnet *ifp = arg; 646 int err; 647 648 if (rt->rt_ifp == ifp) { 649 650 /* 651 * Protect (sorta) against walktree recursion problems 652 * with cloned routes 653 */ 654 if ((rt->rt_flags & RTF_UP) == 0) 655 return (0); 656 657 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 658 rt_mask(rt), rt->rt_flags, 659 (struct rtentry **) NULL); 660 if (err) { 661 log(LOG_WARNING, "if_rtdel: error %d\n", err); 662 } 663 } 664 665 return (0); 666 } 667 668 #define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 669 670 /* 671 * Locate an interface based on a complete address. 672 */ 673 /*ARGSUSED*/ 674 struct ifaddr * 675 ifa_ifwithaddr(struct sockaddr *addr) 676 { 677 struct ifnet *ifp; 678 struct ifaddr *ifa; 679 680 IFNET_RLOCK(); 681 TAILQ_FOREACH(ifp, &ifnet, if_link) 682 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 683 if (ifa->ifa_addr->sa_family != addr->sa_family) 684 continue; 685 if (equal(addr, ifa->ifa_addr)) 686 goto done; 687 /* IP6 doesn't have broadcast */ 688 if ((ifp->if_flags & IFF_BROADCAST) && 689 ifa->ifa_broadaddr && 690 ifa->ifa_broadaddr->sa_len != 0 && 691 equal(ifa->ifa_broadaddr, addr)) 692 goto done; 693 } 694 ifa = NULL; 695 done: 696 IFNET_RUNLOCK(); 697 return (ifa); 698 } 699 700 /* 701 * Locate the point to point interface with a given destination address. 702 */ 703 /*ARGSUSED*/ 704 struct ifaddr * 705 ifa_ifwithdstaddr(struct sockaddr *addr) 706 { 707 struct ifnet *ifp; 708 struct ifaddr *ifa; 709 710 IFNET_RLOCK(); 711 TAILQ_FOREACH(ifp, &ifnet, if_link) { 712 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 713 continue; 714 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 715 if (ifa->ifa_addr->sa_family != addr->sa_family) 716 continue; 717 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 718 goto done; 719 } 720 } 721 ifa = NULL; 722 done: 723 IFNET_RUNLOCK(); 724 return (ifa); 725 } 726 727 /* 728 * Find an interface on a specific network. If many, choice 729 * is most specific found. 730 */ 731 struct ifaddr * 732 ifa_ifwithnet(struct sockaddr *addr) 733 { 734 struct ifnet *ifp; 735 struct ifaddr *ifa; 736 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 737 u_int af = addr->sa_family; 738 char *addr_data = addr->sa_data, *cplim; 739 740 /* 741 * AF_LINK addresses can be looked up directly by their index number, 742 * so do that if we can. 743 */ 744 if (af == AF_LINK) { 745 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 746 if (sdl->sdl_index && sdl->sdl_index <= if_index) 747 return (ifaddr_byindex(sdl->sdl_index)); 748 } 749 750 /* 751 * Scan though each interface, looking for ones that have 752 * addresses in this address family. 753 */ 754 IFNET_RLOCK(); 755 TAILQ_FOREACH(ifp, &ifnet, if_link) { 756 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 757 char *cp, *cp2, *cp3; 758 759 if (ifa->ifa_addr->sa_family != af) 760 next: continue; 761 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 762 /* 763 * This is a bit broken as it doesn't 764 * take into account that the remote end may 765 * be a single node in the network we are 766 * looking for. 767 * The trouble is that we don't know the 768 * netmask for the remote end. 769 */ 770 if (ifa->ifa_dstaddr != 0 771 && equal(addr, ifa->ifa_dstaddr)) 772 goto done; 773 } else { 774 /* 775 * if we have a special address handler, 776 * then use it instead of the generic one. 777 */ 778 if (ifa->ifa_claim_addr) { 779 if ((*ifa->ifa_claim_addr)(ifa, addr)) 780 goto done; 781 continue; 782 } 783 784 /* 785 * Scan all the bits in the ifa's address. 786 * If a bit dissagrees with what we are 787 * looking for, mask it with the netmask 788 * to see if it really matters. 789 * (A byte at a time) 790 */ 791 if (ifa->ifa_netmask == 0) 792 continue; 793 cp = addr_data; 794 cp2 = ifa->ifa_addr->sa_data; 795 cp3 = ifa->ifa_netmask->sa_data; 796 cplim = ifa->ifa_netmask->sa_len 797 + (char *)ifa->ifa_netmask; 798 while (cp3 < cplim) 799 if ((*cp++ ^ *cp2++) & *cp3++) 800 goto next; /* next address! */ 801 /* 802 * If the netmask of what we just found 803 * is more specific than what we had before 804 * (if we had one) then remember the new one 805 * before continuing to search 806 * for an even better one. 807 */ 808 if (ifa_maybe == 0 || 809 rn_refines((caddr_t)ifa->ifa_netmask, 810 (caddr_t)ifa_maybe->ifa_netmask)) 811 ifa_maybe = ifa; 812 } 813 } 814 } 815 ifa = ifa_maybe; 816 done: 817 IFNET_RUNLOCK(); 818 return (ifa); 819 } 820 821 /* 822 * Find an interface address specific to an interface best matching 823 * a given address. 824 */ 825 struct ifaddr * 826 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 827 { 828 struct ifaddr *ifa; 829 char *cp, *cp2, *cp3; 830 char *cplim; 831 struct ifaddr *ifa_maybe = 0; 832 u_int af = addr->sa_family; 833 834 if (af >= AF_MAX) 835 return (0); 836 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 837 if (ifa->ifa_addr->sa_family != af) 838 continue; 839 if (ifa_maybe == 0) 840 ifa_maybe = ifa; 841 if (ifa->ifa_netmask == 0) { 842 if (equal(addr, ifa->ifa_addr) || 843 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 844 goto done; 845 continue; 846 } 847 if (ifp->if_flags & IFF_POINTOPOINT) { 848 if (equal(addr, ifa->ifa_dstaddr)) 849 goto done; 850 } else { 851 cp = addr->sa_data; 852 cp2 = ifa->ifa_addr->sa_data; 853 cp3 = ifa->ifa_netmask->sa_data; 854 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 855 for (; cp3 < cplim; cp3++) 856 if ((*cp++ ^ *cp2++) & *cp3) 857 break; 858 if (cp3 == cplim) 859 goto done; 860 } 861 } 862 ifa = ifa_maybe; 863 done: 864 return (ifa); 865 } 866 867 #include <net/route.h> 868 869 /* 870 * Default action when installing a route with a Link Level gateway. 871 * Lookup an appropriate real ifa to point to. 872 * This should be moved to /sys/net/link.c eventually. 873 */ 874 static void 875 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 876 { 877 struct ifaddr *ifa, *oifa; 878 struct sockaddr *dst; 879 struct ifnet *ifp; 880 881 RT_LOCK_ASSERT(rt); 882 883 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 884 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 885 return; 886 ifa = ifaof_ifpforaddr(dst, ifp); 887 if (ifa) { 888 IFAREF(ifa); /* XXX */ 889 oifa = rt->rt_ifa; 890 rt->rt_ifa = ifa; 891 IFAFREE(oifa); 892 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 893 ifa->ifa_rtrequest(cmd, rt, info); 894 } 895 } 896 897 /* 898 * Mark an interface down and notify protocols of 899 * the transition. 900 * NOTE: must be called at splnet or eqivalent. 901 */ 902 static void 903 if_unroute(struct ifnet *ifp, int flag, int fam) 904 { 905 struct ifaddr *ifa; 906 907 ifp->if_flags &= ~flag; 908 getmicrotime(&ifp->if_lastchange); 909 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 910 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 911 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 912 if_qflush(&ifp->if_snd); 913 rt_ifmsg(ifp); 914 } 915 916 /* 917 * Mark an interface up and notify protocols of 918 * the transition. 919 * NOTE: must be called at splnet or eqivalent. 920 */ 921 static void 922 if_route(struct ifnet *ifp, int flag, int fam) 923 { 924 struct ifaddr *ifa; 925 926 ifp->if_flags |= flag; 927 getmicrotime(&ifp->if_lastchange); 928 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 929 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 930 pfctlinput(PRC_IFUP, ifa->ifa_addr); 931 rt_ifmsg(ifp); 932 #ifdef INET6 933 in6_if_up(ifp); 934 #endif 935 } 936 937 /* 938 * Mark an interface down and notify protocols of 939 * the transition. 940 * NOTE: must be called at splnet or eqivalent. 941 */ 942 void 943 if_down(struct ifnet *ifp) 944 { 945 946 if_unroute(ifp, IFF_UP, AF_UNSPEC); 947 } 948 949 /* 950 * Mark an interface up and notify protocols of 951 * the transition. 952 * NOTE: must be called at splnet or eqivalent. 953 */ 954 void 955 if_up(struct ifnet *ifp) 956 { 957 958 if_route(ifp, IFF_UP, AF_UNSPEC); 959 } 960 961 /* 962 * Flush an interface queue. 963 */ 964 static void 965 if_qflush(struct ifaltq *ifq) 966 { 967 struct mbuf *m, *n; 968 969 #ifdef ALTQ 970 if (ALTQ_IS_ENABLED(ifq)) 971 ALTQ_PURGE(ifq); 972 #endif 973 n = ifq->ifq_head; 974 while ((m = n) != 0) { 975 n = m->m_act; 976 m_freem(m); 977 } 978 ifq->ifq_head = 0; 979 ifq->ifq_tail = 0; 980 ifq->ifq_len = 0; 981 } 982 983 /* 984 * Handle interface watchdog timer routines. Called 985 * from softclock, we decrement timers (if set) and 986 * call the appropriate interface routine on expiration. 987 */ 988 static void 989 if_slowtimo(void *arg) 990 { 991 struct ifnet *ifp; 992 int s = splimp(); 993 994 IFNET_RLOCK(); 995 TAILQ_FOREACH(ifp, &ifnet, if_link) { 996 if (ifp->if_timer == 0 || --ifp->if_timer) 997 continue; 998 if (ifp->if_watchdog) 999 (*ifp->if_watchdog)(ifp); 1000 } 1001 IFNET_RUNLOCK(); 1002 splx(s); 1003 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1004 } 1005 1006 /* 1007 * Map interface name to 1008 * interface structure pointer. 1009 */ 1010 struct ifnet * 1011 ifunit(const char *name) 1012 { 1013 struct ifnet *ifp; 1014 1015 IFNET_RLOCK(); 1016 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1017 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1018 break; 1019 } 1020 IFNET_RUNLOCK(); 1021 return (ifp); 1022 } 1023 1024 /* 1025 * Hardware specific interface ioctls. 1026 */ 1027 static int 1028 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1029 { 1030 struct ifreq *ifr; 1031 struct ifstat *ifs; 1032 int error = 0; 1033 int new_flags; 1034 size_t namelen, onamelen; 1035 char new_name[IFNAMSIZ]; 1036 struct ifaddr *ifa; 1037 struct sockaddr_dl *sdl; 1038 1039 ifr = (struct ifreq *)data; 1040 switch (cmd) { 1041 case SIOCGIFINDEX: 1042 ifr->ifr_index = ifp->if_index; 1043 break; 1044 1045 case SIOCGIFFLAGS: 1046 ifr->ifr_flags = ifp->if_flags & 0xffff; 1047 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1048 break; 1049 1050 case SIOCGIFCAP: 1051 ifr->ifr_reqcap = ifp->if_capabilities; 1052 ifr->ifr_curcap = ifp->if_capenable; 1053 break; 1054 1055 #ifdef MAC 1056 case SIOCGIFMAC: 1057 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1058 break; 1059 #endif 1060 1061 case SIOCGIFMETRIC: 1062 ifr->ifr_metric = ifp->if_metric; 1063 break; 1064 1065 case SIOCGIFMTU: 1066 ifr->ifr_mtu = ifp->if_mtu; 1067 break; 1068 1069 case SIOCGIFPHYS: 1070 ifr->ifr_phys = ifp->if_physical; 1071 break; 1072 1073 case SIOCSIFFLAGS: 1074 error = suser(td); 1075 if (error) 1076 return (error); 1077 new_flags = (ifr->ifr_flags & 0xffff) | 1078 (ifr->ifr_flagshigh << 16); 1079 if (ifp->if_flags & IFF_SMART) { 1080 /* Smart drivers twiddle their own routes */ 1081 } else if (ifp->if_flags & IFF_UP && 1082 (new_flags & IFF_UP) == 0) { 1083 int s = splimp(); 1084 if_down(ifp); 1085 splx(s); 1086 } else if (new_flags & IFF_UP && 1087 (ifp->if_flags & IFF_UP) == 0) { 1088 int s = splimp(); 1089 if_up(ifp); 1090 splx(s); 1091 } 1092 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1093 (new_flags &~ IFF_CANTCHANGE); 1094 if (new_flags & IFF_PPROMISC) { 1095 /* Permanently promiscuous mode requested */ 1096 ifp->if_flags |= IFF_PROMISC; 1097 } else if (ifp->if_pcount == 0) { 1098 ifp->if_flags &= ~IFF_PROMISC; 1099 } 1100 if (ifp->if_ioctl) 1101 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1102 getmicrotime(&ifp->if_lastchange); 1103 break; 1104 1105 case SIOCSIFCAP: 1106 error = suser(td); 1107 if (error) 1108 return (error); 1109 if (ifp->if_ioctl == NULL) 1110 return (EOPNOTSUPP); 1111 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1112 return (EINVAL); 1113 error = (*ifp->if_ioctl)(ifp, cmd, data); 1114 if (error == 0) 1115 getmicrotime(&ifp->if_lastchange); 1116 break; 1117 1118 #ifdef MAC 1119 case SIOCSIFMAC: 1120 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1121 break; 1122 #endif 1123 1124 case SIOCSIFNAME: 1125 error = suser(td); 1126 if (error != 0) 1127 return (error); 1128 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1129 if (error != 0) 1130 return (error); 1131 if (new_name[0] == '\0') 1132 return (EINVAL); 1133 if (ifunit(new_name) != NULL) 1134 return (EEXIST); 1135 1136 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1137 /* Announce the departure of the interface. */ 1138 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1139 1140 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1141 ifa = ifaddr_byindex(ifp->if_index); 1142 IFA_LOCK(ifa); 1143 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1144 namelen = strlen(new_name); 1145 onamelen = sdl->sdl_nlen; 1146 /* 1147 * Move the address if needed. This is safe because we 1148 * allocate space for a name of length IFNAMSIZ when we 1149 * create this in if_attach(). 1150 */ 1151 if (namelen != onamelen) { 1152 bcopy(sdl->sdl_data + onamelen, 1153 sdl->sdl_data + namelen, sdl->sdl_alen); 1154 } 1155 bcopy(new_name, sdl->sdl_data, namelen); 1156 sdl->sdl_nlen = namelen; 1157 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1158 bzero(sdl->sdl_data, onamelen); 1159 while (namelen != 0) 1160 sdl->sdl_data[--namelen] = 0xff; 1161 IFA_UNLOCK(ifa); 1162 1163 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1164 /* Announce the return of the interface. */ 1165 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1166 break; 1167 1168 case SIOCSIFMETRIC: 1169 error = suser(td); 1170 if (error) 1171 return (error); 1172 ifp->if_metric = ifr->ifr_metric; 1173 getmicrotime(&ifp->if_lastchange); 1174 break; 1175 1176 case SIOCSIFPHYS: 1177 error = suser(td); 1178 if (error) 1179 return (error); 1180 if (ifp->if_ioctl == NULL) 1181 return (EOPNOTSUPP); 1182 error = (*ifp->if_ioctl)(ifp, cmd, data); 1183 if (error == 0) 1184 getmicrotime(&ifp->if_lastchange); 1185 break; 1186 1187 case SIOCSIFMTU: 1188 { 1189 u_long oldmtu = ifp->if_mtu; 1190 1191 error = suser(td); 1192 if (error) 1193 return (error); 1194 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1195 return (EINVAL); 1196 if (ifp->if_ioctl == NULL) 1197 return (EOPNOTSUPP); 1198 error = (*ifp->if_ioctl)(ifp, cmd, data); 1199 if (error == 0) { 1200 getmicrotime(&ifp->if_lastchange); 1201 rt_ifmsg(ifp); 1202 } 1203 /* 1204 * If the link MTU changed, do network layer specific procedure. 1205 */ 1206 if (ifp->if_mtu != oldmtu) { 1207 #ifdef INET6 1208 nd6_setmtu(ifp); 1209 #endif 1210 } 1211 break; 1212 } 1213 1214 case SIOCADDMULTI: 1215 case SIOCDELMULTI: 1216 error = suser(td); 1217 if (error) 1218 return (error); 1219 1220 /* Don't allow group membership on non-multicast interfaces. */ 1221 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1222 return (EOPNOTSUPP); 1223 1224 /* Don't let users screw up protocols' entries. */ 1225 if (ifr->ifr_addr.sa_family != AF_LINK) 1226 return (EINVAL); 1227 1228 if (cmd == SIOCADDMULTI) { 1229 struct ifmultiaddr *ifma; 1230 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1231 } else { 1232 error = if_delmulti(ifp, &ifr->ifr_addr); 1233 } 1234 if (error == 0) 1235 getmicrotime(&ifp->if_lastchange); 1236 break; 1237 1238 case SIOCSIFPHYADDR: 1239 case SIOCDIFPHYADDR: 1240 #ifdef INET6 1241 case SIOCSIFPHYADDR_IN6: 1242 #endif 1243 case SIOCSLIFPHYADDR: 1244 case SIOCSIFMEDIA: 1245 case SIOCSIFGENERIC: 1246 error = suser(td); 1247 if (error) 1248 return (error); 1249 if (ifp->if_ioctl == NULL) 1250 return (EOPNOTSUPP); 1251 error = (*ifp->if_ioctl)(ifp, cmd, data); 1252 if (error == 0) 1253 getmicrotime(&ifp->if_lastchange); 1254 break; 1255 1256 case SIOCGIFSTATUS: 1257 ifs = (struct ifstat *)data; 1258 ifs->ascii[0] = '\0'; 1259 1260 case SIOCGIFPSRCADDR: 1261 case SIOCGIFPDSTADDR: 1262 case SIOCGLIFPHYADDR: 1263 case SIOCGIFMEDIA: 1264 case SIOCGIFGENERIC: 1265 if (ifp->if_ioctl == NULL) 1266 return (EOPNOTSUPP); 1267 error = (*ifp->if_ioctl)(ifp, cmd, data); 1268 break; 1269 1270 case SIOCSIFLLADDR: 1271 error = suser(td); 1272 if (error) 1273 return (error); 1274 error = if_setlladdr(ifp, 1275 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1276 break; 1277 1278 default: 1279 error = ENOIOCTL; 1280 break; 1281 } 1282 return (error); 1283 } 1284 1285 /* 1286 * Interface ioctls. 1287 */ 1288 int 1289 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1290 { 1291 struct ifnet *ifp; 1292 struct ifreq *ifr; 1293 int error; 1294 int oif_flags; 1295 1296 switch (cmd) { 1297 case SIOCGIFCONF: 1298 case OSIOCGIFCONF: 1299 return (ifconf(cmd, data)); 1300 } 1301 ifr = (struct ifreq *)data; 1302 1303 switch (cmd) { 1304 case SIOCIFCREATE: 1305 case SIOCIFDESTROY: 1306 if ((error = suser(td)) != 0) 1307 return (error); 1308 return ((cmd == SIOCIFCREATE) ? 1309 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1310 if_clone_destroy(ifr->ifr_name)); 1311 1312 case SIOCIFGCLONERS: 1313 return (if_clone_list((struct if_clonereq *)data)); 1314 } 1315 1316 ifp = ifunit(ifr->ifr_name); 1317 if (ifp == 0) 1318 return (ENXIO); 1319 1320 error = ifhwioctl(cmd, ifp, data, td); 1321 if (error != ENOIOCTL) 1322 return (error); 1323 1324 oif_flags = ifp->if_flags; 1325 if (so->so_proto == 0) 1326 return (EOPNOTSUPP); 1327 #ifndef COMPAT_43 1328 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1329 data, 1330 ifp, td)); 1331 #else 1332 { 1333 int ocmd = cmd; 1334 1335 switch (cmd) { 1336 1337 case SIOCSIFDSTADDR: 1338 case SIOCSIFADDR: 1339 case SIOCSIFBRDADDR: 1340 case SIOCSIFNETMASK: 1341 #if BYTE_ORDER != BIG_ENDIAN 1342 if (ifr->ifr_addr.sa_family == 0 && 1343 ifr->ifr_addr.sa_len < 16) { 1344 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1345 ifr->ifr_addr.sa_len = 16; 1346 } 1347 #else 1348 if (ifr->ifr_addr.sa_len == 0) 1349 ifr->ifr_addr.sa_len = 16; 1350 #endif 1351 break; 1352 1353 case OSIOCGIFADDR: 1354 cmd = SIOCGIFADDR; 1355 break; 1356 1357 case OSIOCGIFDSTADDR: 1358 cmd = SIOCGIFDSTADDR; 1359 break; 1360 1361 case OSIOCGIFBRDADDR: 1362 cmd = SIOCGIFBRDADDR; 1363 break; 1364 1365 case OSIOCGIFNETMASK: 1366 cmd = SIOCGIFNETMASK; 1367 } 1368 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1369 cmd, 1370 data, 1371 ifp, td)); 1372 switch (ocmd) { 1373 1374 case OSIOCGIFADDR: 1375 case OSIOCGIFDSTADDR: 1376 case OSIOCGIFBRDADDR: 1377 case OSIOCGIFNETMASK: 1378 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1379 1380 } 1381 } 1382 #endif /* COMPAT_43 */ 1383 1384 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1385 #ifdef INET6 1386 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1387 if (ifp->if_flags & IFF_UP) { 1388 int s = splimp(); 1389 in6_if_up(ifp); 1390 splx(s); 1391 } 1392 #endif 1393 } 1394 return (error); 1395 } 1396 1397 /* 1398 * Set/clear promiscuous mode on interface ifp based on the truth value 1399 * of pswitch. The calls are reference counted so that only the first 1400 * "on" request actually has an effect, as does the final "off" request. 1401 * Results are undefined if the "off" and "on" requests are not matched. 1402 */ 1403 int 1404 ifpromisc(struct ifnet *ifp, int pswitch) 1405 { 1406 struct ifreq ifr; 1407 int error; 1408 int oldflags, oldpcount; 1409 1410 oldpcount = ifp->if_pcount; 1411 oldflags = ifp->if_flags; 1412 if (ifp->if_flags & IFF_PPROMISC) { 1413 /* Do nothing if device is in permanently promiscuous mode */ 1414 ifp->if_pcount += pswitch ? 1 : -1; 1415 return (0); 1416 } 1417 if (pswitch) { 1418 /* 1419 * If the device is not configured up, we cannot put it in 1420 * promiscuous mode. 1421 */ 1422 if ((ifp->if_flags & IFF_UP) == 0) 1423 return (ENETDOWN); 1424 if (ifp->if_pcount++ != 0) 1425 return (0); 1426 ifp->if_flags |= IFF_PROMISC; 1427 } else { 1428 if (--ifp->if_pcount > 0) 1429 return (0); 1430 ifp->if_flags &= ~IFF_PROMISC; 1431 } 1432 ifr.ifr_flags = ifp->if_flags & 0xffff; 1433 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1434 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1435 if (error == 0) { 1436 log(LOG_INFO, "%s: promiscuous mode %s\n", 1437 ifp->if_xname, 1438 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1439 rt_ifmsg(ifp); 1440 } else { 1441 ifp->if_pcount = oldpcount; 1442 ifp->if_flags = oldflags; 1443 } 1444 return error; 1445 } 1446 1447 /* 1448 * Return interface configuration 1449 * of system. List may be used 1450 * in later ioctl's (above) to get 1451 * other information. 1452 */ 1453 /*ARGSUSED*/ 1454 static int 1455 ifconf(u_long cmd, caddr_t data) 1456 { 1457 struct ifconf *ifc = (struct ifconf *)data; 1458 struct ifnet *ifp; 1459 struct ifaddr *ifa; 1460 struct ifreq ifr, *ifrp; 1461 int space = ifc->ifc_len, error = 0; 1462 1463 ifrp = ifc->ifc_req; 1464 IFNET_RLOCK(); /* could sleep XXX */ 1465 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1466 int addrs; 1467 1468 if (space < sizeof(ifr)) 1469 break; 1470 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1471 >= sizeof(ifr.ifr_name)) { 1472 error = ENAMETOOLONG; 1473 break; 1474 } 1475 1476 addrs = 0; 1477 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1478 struct sockaddr *sa = ifa->ifa_addr; 1479 1480 if (space < sizeof(ifr)) 1481 break; 1482 if (jailed(curthread->td_ucred) && 1483 prison_if(curthread->td_ucred, sa)) 1484 continue; 1485 addrs++; 1486 #ifdef COMPAT_43 1487 if (cmd == OSIOCGIFCONF) { 1488 struct osockaddr *osa = 1489 (struct osockaddr *)&ifr.ifr_addr; 1490 ifr.ifr_addr = *sa; 1491 osa->sa_family = sa->sa_family; 1492 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1493 sizeof (ifr)); 1494 ifrp++; 1495 } else 1496 #endif 1497 if (sa->sa_len <= sizeof(*sa)) { 1498 ifr.ifr_addr = *sa; 1499 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1500 sizeof (ifr)); 1501 ifrp++; 1502 } else { 1503 if (space < sizeof (ifr) + sa->sa_len - 1504 sizeof(*sa)) 1505 break; 1506 space -= sa->sa_len - sizeof(*sa); 1507 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1508 sizeof (ifr.ifr_name)); 1509 if (error == 0) 1510 error = copyout((caddr_t)sa, 1511 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1512 ifrp = (struct ifreq *) 1513 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1514 } 1515 if (error) 1516 break; 1517 space -= sizeof (ifr); 1518 } 1519 if (error) 1520 break; 1521 if (!addrs) { 1522 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1523 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1524 sizeof (ifr)); 1525 if (error) 1526 break; 1527 space -= sizeof (ifr); 1528 ifrp++; 1529 } 1530 } 1531 IFNET_RUNLOCK(); 1532 ifc->ifc_len -= space; 1533 return (error); 1534 } 1535 1536 /* 1537 * Just like if_promisc(), but for all-multicast-reception mode. 1538 */ 1539 int 1540 if_allmulti(struct ifnet *ifp, int onswitch) 1541 { 1542 int error = 0; 1543 int s = splimp(); 1544 struct ifreq ifr; 1545 1546 if (onswitch) { 1547 if (ifp->if_amcount++ == 0) { 1548 ifp->if_flags |= IFF_ALLMULTI; 1549 ifr.ifr_flags = ifp->if_flags & 0xffff; 1550 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1551 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1552 } 1553 } else { 1554 if (ifp->if_amcount > 1) { 1555 ifp->if_amcount--; 1556 } else { 1557 ifp->if_amcount = 0; 1558 ifp->if_flags &= ~IFF_ALLMULTI; 1559 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1560 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1561 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1562 } 1563 } 1564 splx(s); 1565 1566 if (error == 0) 1567 rt_ifmsg(ifp); 1568 return error; 1569 } 1570 1571 /* 1572 * Add a multicast listenership to the interface in question. 1573 * The link layer provides a routine which converts 1574 */ 1575 int 1576 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1577 { 1578 struct sockaddr *llsa, *dupsa; 1579 int error, s; 1580 struct ifmultiaddr *ifma; 1581 1582 /* 1583 * If the matching multicast address already exists 1584 * then don't add a new one, just add a reference 1585 */ 1586 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1587 if (equal(sa, ifma->ifma_addr)) { 1588 ifma->ifma_refcount++; 1589 if (retifma) 1590 *retifma = ifma; 1591 return 0; 1592 } 1593 } 1594 1595 /* 1596 * Give the link layer a chance to accept/reject it, and also 1597 * find out which AF_LINK address this maps to, if it isn't one 1598 * already. 1599 */ 1600 if (ifp->if_resolvemulti) { 1601 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1602 if (error) return error; 1603 } else { 1604 llsa = 0; 1605 } 1606 1607 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1608 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1609 bcopy(sa, dupsa, sa->sa_len); 1610 1611 ifma->ifma_addr = dupsa; 1612 ifma->ifma_lladdr = llsa; 1613 ifma->ifma_ifp = ifp; 1614 ifma->ifma_refcount = 1; 1615 ifma->ifma_protospec = 0; 1616 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1617 1618 /* 1619 * Some network interfaces can scan the address list at 1620 * interrupt time; lock them out. 1621 */ 1622 s = splimp(); 1623 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1624 splx(s); 1625 if (retifma != NULL) 1626 *retifma = ifma; 1627 1628 if (llsa != 0) { 1629 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1630 if (equal(ifma->ifma_addr, llsa)) 1631 break; 1632 } 1633 if (ifma) { 1634 ifma->ifma_refcount++; 1635 } else { 1636 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1637 M_IFMADDR, M_WAITOK); 1638 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1639 M_IFMADDR, M_WAITOK); 1640 bcopy(llsa, dupsa, llsa->sa_len); 1641 ifma->ifma_addr = dupsa; 1642 ifma->ifma_lladdr = NULL; 1643 ifma->ifma_ifp = ifp; 1644 ifma->ifma_refcount = 1; 1645 ifma->ifma_protospec = 0; 1646 s = splimp(); 1647 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1648 splx(s); 1649 } 1650 } 1651 /* 1652 * We are certain we have added something, so call down to the 1653 * interface to let them know about it. 1654 */ 1655 s = splimp(); 1656 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1657 splx(s); 1658 1659 return 0; 1660 } 1661 1662 /* 1663 * Remove a reference to a multicast address on this interface. Yell 1664 * if the request does not match an existing membership. 1665 */ 1666 int 1667 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1668 { 1669 struct ifmultiaddr *ifma; 1670 int s; 1671 1672 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1673 if (equal(sa, ifma->ifma_addr)) 1674 break; 1675 if (ifma == 0) 1676 return ENOENT; 1677 1678 if (ifma->ifma_refcount > 1) { 1679 ifma->ifma_refcount--; 1680 return 0; 1681 } 1682 1683 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1684 sa = ifma->ifma_lladdr; 1685 s = splimp(); 1686 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1687 /* 1688 * Make sure the interface driver is notified 1689 * in the case of a link layer mcast group being left. 1690 */ 1691 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1692 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1693 splx(s); 1694 free(ifma->ifma_addr, M_IFMADDR); 1695 free(ifma, M_IFMADDR); 1696 if (sa == 0) 1697 return 0; 1698 1699 /* 1700 * Now look for the link-layer address which corresponds to 1701 * this network address. It had been squirreled away in 1702 * ifma->ifma_lladdr for this purpose (so we don't have 1703 * to call ifp->if_resolvemulti() again), and we saved that 1704 * value in sa above. If some nasty deleted the 1705 * link-layer address out from underneath us, we can deal because 1706 * the address we stored was is not the same as the one which was 1707 * in the record for the link-layer address. (So we don't complain 1708 * in that case.) 1709 */ 1710 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1711 if (equal(sa, ifma->ifma_addr)) 1712 break; 1713 if (ifma == 0) 1714 return 0; 1715 1716 if (ifma->ifma_refcount > 1) { 1717 ifma->ifma_refcount--; 1718 return 0; 1719 } 1720 1721 s = splimp(); 1722 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1723 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1724 splx(s); 1725 free(ifma->ifma_addr, M_IFMADDR); 1726 free(sa, M_IFMADDR); 1727 free(ifma, M_IFMADDR); 1728 1729 return 0; 1730 } 1731 1732 /* 1733 * Set the link layer address on an interface. 1734 * 1735 * At this time we only support certain types of interfaces, 1736 * and we don't allow the length of the address to change. 1737 */ 1738 int 1739 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1740 { 1741 struct sockaddr_dl *sdl; 1742 struct ifaddr *ifa; 1743 struct ifreq ifr; 1744 1745 ifa = ifaddr_byindex(ifp->if_index); 1746 if (ifa == NULL) 1747 return (EINVAL); 1748 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1749 if (sdl == NULL) 1750 return (EINVAL); 1751 if (len != sdl->sdl_alen) /* don't allow length to change */ 1752 return (EINVAL); 1753 switch (ifp->if_type) { 1754 case IFT_ETHER: /* these types use struct arpcom */ 1755 case IFT_FDDI: 1756 case IFT_XETHER: 1757 case IFT_ISO88025: 1758 case IFT_L2VLAN: 1759 bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len); 1760 /* 1761 * XXX We also need to store the lladdr in LLADDR(sdl), 1762 * which is done below. This is a pain because we must 1763 * remember to keep the info in sync. 1764 */ 1765 /* FALLTHROUGH */ 1766 case IFT_ARCNET: 1767 bcopy(lladdr, LLADDR(sdl), len); 1768 break; 1769 default: 1770 return (ENODEV); 1771 } 1772 /* 1773 * If the interface is already up, we need 1774 * to re-init it in order to reprogram its 1775 * address filter. 1776 */ 1777 if ((ifp->if_flags & IFF_UP) != 0) { 1778 ifp->if_flags &= ~IFF_UP; 1779 ifr.ifr_flags = ifp->if_flags & 0xffff; 1780 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1781 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1782 ifp->if_flags |= IFF_UP; 1783 ifr.ifr_flags = ifp->if_flags & 0xffff; 1784 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1785 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1786 #ifdef INET 1787 /* 1788 * Also send gratuitous ARPs to notify other nodes about 1789 * the address change. 1790 */ 1791 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1792 if (ifa->ifa_addr != NULL && 1793 ifa->ifa_addr->sa_family == AF_INET) 1794 arp_ifinit(ifp, ifa); 1795 } 1796 #endif 1797 } 1798 return (0); 1799 } 1800 1801 struct ifmultiaddr * 1802 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1803 { 1804 struct ifmultiaddr *ifma; 1805 1806 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1807 if (equal(ifma->ifma_addr, sa)) 1808 break; 1809 1810 return ifma; 1811 } 1812 1813 /* 1814 * The name argument must be a pointer to storage which will last as 1815 * long as the interface does. For physical devices, the result of 1816 * device_get_name(dev) is a good choice and for pseudo-devices a 1817 * static string works well. 1818 */ 1819 void 1820 if_initname(struct ifnet *ifp, const char *name, int unit) 1821 { 1822 ifp->if_dname = name; 1823 ifp->if_dunit = unit; 1824 if (unit != IF_DUNIT_NONE) 1825 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1826 else 1827 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1828 } 1829 1830 int 1831 if_printf(struct ifnet *ifp, const char * fmt, ...) 1832 { 1833 va_list ap; 1834 int retval; 1835 1836 retval = printf("%s: ", ifp->if_xname); 1837 va_start(ap, fmt); 1838 retval += vprintf(fmt, ap); 1839 va_end(ap); 1840 return (retval); 1841 } 1842 1843 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 1844 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 1845