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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)if.c 8.5 (Berkeley) 1/9/95 34 * $FreeBSD$ 35 */ 36 37 #include "opt_compat.h" 38 #include "opt_inet6.h" 39 #include "opt_inet.h" 40 #include "opt_mac.h" 41 42 #include <sys/param.h> 43 #include <sys/conf.h> 44 #include <sys/mac.h> 45 #include <sys/malloc.h> 46 #include <sys/bus.h> 47 #include <sys/mbuf.h> 48 #include <sys/systm.h> 49 #include <sys/proc.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/protosw.h> 53 #include <sys/kernel.h> 54 #include <sys/sockio.h> 55 #include <sys/syslog.h> 56 #include <sys/sysctl.h> 57 #include <sys/domain.h> 58 #include <sys/jail.h> 59 #include <machine/stdarg.h> 60 61 #include <net/if.h> 62 #include <net/if_arp.h> 63 #include <net/if_dl.h> 64 #include <net/if_types.h> 65 #include <net/if_var.h> 66 #include <net/radix.h> 67 #include <net/route.h> 68 69 #if defined(INET) || defined(INET6) 70 /*XXX*/ 71 #include <netinet/in.h> 72 #include <netinet/in_var.h> 73 #ifdef INET6 74 #include <netinet6/in6_var.h> 75 #include <netinet6/in6_ifattach.h> 76 #endif 77 #endif 78 #ifdef INET 79 #include <netinet/if_ether.h> 80 #endif 81 82 static void if_attachdomain(void *); 83 static void if_attachdomain1(struct ifnet *); 84 static int ifconf(u_long, caddr_t); 85 static void if_grow(void); 86 static void if_init(void *); 87 static void if_check(void *); 88 static int if_findindex(struct ifnet *); 89 static void if_qflush(struct ifqueue *); 90 static void if_slowtimo(void *); 91 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 92 static int if_rtdel(struct radix_node *, void *); 93 static struct if_clone *if_clone_lookup(const char *, int *); 94 static int if_clone_list(struct if_clonereq *); 95 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 96 #ifdef INET6 97 /* 98 * XXX: declare here to avoid to include many inet6 related files.. 99 * should be more generalized? 100 */ 101 extern void nd6_setmtu(struct ifnet *); 102 #endif 103 104 int if_index = 0; 105 struct ifindex_entry *ifindex_table = NULL; 106 int ifqmaxlen = IFQ_MAXLEN; 107 struct ifnethead ifnet; /* depend on static init XXX */ 108 struct mtx ifnet_lock; 109 static int if_cloners_count; 110 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 111 112 static int if_indexlim = 8; 113 static struct klist ifklist; 114 115 static void filt_netdetach(struct knote *kn); 116 static int filt_netdev(struct knote *kn, long hint); 117 118 static struct filterops netdev_filtops = 119 { 1, NULL, filt_netdetach, filt_netdev }; 120 121 /* 122 * System initialization 123 */ 124 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 125 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 126 127 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 128 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 129 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 130 131 static d_open_t netopen; 132 static d_close_t netclose; 133 static d_ioctl_t netioctl; 134 static d_kqfilter_t netkqfilter; 135 136 static struct cdevsw net_cdevsw = { 137 .d_version = D_VERSION, 138 .d_flags = D_NEEDGIANT, 139 .d_open = netopen, 140 .d_close = netclose, 141 .d_ioctl = netioctl, 142 .d_name = "net", 143 .d_kqfilter = netkqfilter, 144 }; 145 146 static int 147 netopen(dev_t dev, int flag, int mode, struct thread *td) 148 { 149 return (0); 150 } 151 152 static int 153 netclose(dev_t dev, int flags, int fmt, struct thread *td) 154 { 155 return (0); 156 } 157 158 static int 159 netioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) 160 { 161 struct ifnet *ifp; 162 int error, idx; 163 164 /* only support interface specific ioctls */ 165 if (IOCGROUP(cmd) != 'i') 166 return (EOPNOTSUPP); 167 idx = minor(dev); 168 if (idx == 0) { 169 /* 170 * special network device, not interface. 171 */ 172 if (cmd == SIOCGIFCONF) 173 return (ifconf(cmd, data)); /* XXX remove cmd */ 174 return (EOPNOTSUPP); 175 } 176 177 ifp = ifnet_byindex(idx); 178 if (ifp == NULL) 179 return (ENXIO); 180 181 error = ifhwioctl(cmd, ifp, data, td); 182 if (error == ENOIOCTL) 183 error = EOPNOTSUPP; 184 return (error); 185 } 186 187 static int 188 netkqfilter(dev_t dev, struct knote *kn) 189 { 190 struct klist *klist; 191 struct ifnet *ifp; 192 int idx; 193 194 idx = minor(dev); 195 if (idx == 0) { 196 klist = &ifklist; 197 } else { 198 ifp = ifnet_byindex(idx); 199 if (ifp == NULL) 200 return (1); 201 klist = &ifp->if_klist; 202 } 203 204 switch (kn->kn_filter) { 205 case EVFILT_NETDEV: 206 kn->kn_fop = &netdev_filtops; 207 break; 208 default: 209 return (1); 210 } 211 212 kn->kn_hook = (caddr_t)klist; 213 214 /* XXX locking? */ 215 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 216 217 return (0); 218 } 219 220 static void 221 filt_netdetach(struct knote *kn) 222 { 223 struct klist *klist = (struct klist *)kn->kn_hook; 224 225 if (kn->kn_status & KN_DETACHED) 226 return; 227 SLIST_REMOVE(klist, kn, knote, kn_selnext); 228 } 229 230 static int 231 filt_netdev(struct knote *kn, long hint) 232 { 233 234 /* 235 * Currently NOTE_EXIT is abused to indicate device detach. 236 */ 237 if (hint == NOTE_EXIT) { 238 kn->kn_data = NOTE_LINKINV; 239 kn->kn_status |= KN_DETACHED; 240 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 241 return (1); 242 } 243 kn->kn_data = hint; /* current status */ 244 if (kn->kn_sfflags & hint) 245 kn->kn_fflags |= hint; 246 return (kn->kn_fflags != 0); 247 } 248 249 /* 250 * Network interface utility routines. 251 * 252 * Routines with ifa_ifwith* names take sockaddr *'s as 253 * parameters. 254 */ 255 /* ARGSUSED*/ 256 static void 257 if_init(void *dummy __unused) 258 { 259 260 IFNET_LOCK_INIT(); 261 TAILQ_INIT(&ifnet); 262 SLIST_INIT(&ifklist); 263 if_grow(); /* create initial table */ 264 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 265 UID_ROOT, GID_WHEEL, 0600, "network"); 266 } 267 268 static void 269 if_grow(void) 270 { 271 u_int n; 272 struct ifindex_entry *e; 273 274 if_indexlim <<= 1; 275 n = if_indexlim * sizeof(*e); 276 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 277 if (ifindex_table != NULL) { 278 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 279 free((caddr_t)ifindex_table, M_IFADDR); 280 } 281 ifindex_table = e; 282 } 283 284 /* ARGSUSED*/ 285 static void 286 if_check(void *dummy __unused) 287 { 288 struct ifnet *ifp; 289 int s; 290 291 s = splimp(); 292 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 293 TAILQ_FOREACH(ifp, &ifnet, if_link) { 294 if (ifp->if_snd.ifq_maxlen == 0) { 295 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 296 ifp->if_snd.ifq_maxlen = ifqmaxlen; 297 } 298 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 299 if_printf(ifp, 300 "XXX: driver didn't initialize queue mtx\n"); 301 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 302 MTX_NETWORK_LOCK, MTX_DEF); 303 } 304 } 305 IFNET_RUNLOCK(); 306 splx(s); 307 if_slowtimo(0); 308 } 309 310 static int 311 if_findindex(struct ifnet *ifp) 312 { 313 int i, unit; 314 char eaddr[18], devname[32]; 315 const char *name, *p; 316 317 switch (ifp->if_type) { 318 case IFT_ETHER: /* these types use struct arpcom */ 319 case IFT_FDDI: 320 case IFT_XETHER: 321 case IFT_ISO88025: 322 case IFT_L2VLAN: 323 snprintf(eaddr, 18, "%6D", 324 ((struct arpcom *)ifp->if_softc)->ac_enaddr, ":"); 325 break; 326 default: 327 eaddr[0] = '\0'; 328 break; 329 } 330 strlcpy(devname, ifp->if_xname, sizeof(devname)); 331 name = net_cdevsw.d_name; 332 i = 0; 333 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 334 if (resource_string_value(name, unit, "ether", &p) == 0) 335 if (strcmp(p, eaddr) == 0) 336 goto found; 337 if (resource_string_value(name, unit, "dev", &p) == 0) 338 if (strcmp(p, devname) == 0) 339 goto found; 340 } 341 unit = 0; 342 found: 343 if (unit != 0) { 344 if (ifaddr_byindex(unit) == NULL) 345 return (unit); 346 printf("%s%d in use, cannot hardwire it to %s.\n", 347 name, unit, devname); 348 } 349 for (unit = 1; ; unit++) { 350 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 351 continue; 352 if (resource_string_value(name, unit, "ether", &p) == 0 || 353 resource_string_value(name, unit, "dev", &p) == 0) 354 continue; 355 break; 356 } 357 return (unit); 358 } 359 360 /* 361 * Attach an interface to the 362 * list of "active" interfaces. 363 */ 364 void 365 if_attach(struct ifnet *ifp) 366 { 367 unsigned socksize, ifasize; 368 int namelen, masklen; 369 struct sockaddr_dl *sdl; 370 struct ifaddr *ifa; 371 372 IF_AFDATA_LOCK_INIT(ifp); 373 ifp->if_afdata_initialized = 0; 374 IFNET_WLOCK(); 375 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 376 IFNET_WUNLOCK(); 377 /* 378 * XXX - 379 * The old code would work if the interface passed a pre-existing 380 * chain of ifaddrs to this code. We don't trust our callers to 381 * properly initialize the tailq, however, so we no longer allow 382 * this unlikely case. 383 */ 384 TAILQ_INIT(&ifp->if_addrhead); 385 TAILQ_INIT(&ifp->if_prefixhead); 386 TAILQ_INIT(&ifp->if_multiaddrs); 387 SLIST_INIT(&ifp->if_klist); 388 getmicrotime(&ifp->if_lastchange); 389 390 #ifdef MAC 391 mac_init_ifnet(ifp); 392 mac_create_ifnet(ifp); 393 #endif 394 395 ifp->if_index = if_findindex(ifp); 396 if (ifp->if_index > if_index) 397 if_index = ifp->if_index; 398 if (if_index >= if_indexlim) 399 if_grow(); 400 401 ifnet_byindex(ifp->if_index) = ifp; 402 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 403 unit2minor(ifp->if_index), 404 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 405 net_cdevsw.d_name, ifp->if_xname); 406 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 407 net_cdevsw.d_name, ifp->if_index); 408 409 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 410 411 /* 412 * create a Link Level name for this device 413 */ 414 namelen = strlen(ifp->if_xname); 415 /* 416 * Always save enough space for any possiable name so we can do 417 * a rename in place later. 418 */ 419 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 420 socksize = masklen + ifp->if_addrlen; 421 if (socksize < sizeof(*sdl)) 422 socksize = sizeof(*sdl); 423 socksize = roundup2(socksize, sizeof(long)); 424 ifasize = sizeof(*ifa) + 2 * socksize; 425 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 426 IFA_LOCK_INIT(ifa); 427 sdl = (struct sockaddr_dl *)(ifa + 1); 428 sdl->sdl_len = socksize; 429 sdl->sdl_family = AF_LINK; 430 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 431 sdl->sdl_nlen = namelen; 432 sdl->sdl_index = ifp->if_index; 433 sdl->sdl_type = ifp->if_type; 434 ifaddr_byindex(ifp->if_index) = ifa; 435 ifa->ifa_ifp = ifp; 436 ifa->ifa_rtrequest = link_rtrequest; 437 ifa->ifa_addr = (struct sockaddr *)sdl; 438 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 439 ifa->ifa_netmask = (struct sockaddr *)sdl; 440 sdl->sdl_len = masklen; 441 while (namelen != 0) 442 sdl->sdl_data[--namelen] = 0xff; 443 ifa->ifa_refcnt = 1; 444 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 445 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 446 447 if (domains) 448 if_attachdomain1(ifp); 449 450 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 451 452 /* Announce the interface. */ 453 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 454 } 455 456 static void 457 if_attachdomain(void *dummy) 458 { 459 struct ifnet *ifp; 460 int s; 461 462 s = splnet(); 463 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 464 if_attachdomain1(ifp); 465 splx(s); 466 } 467 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 468 if_attachdomain, NULL); 469 470 static void 471 if_attachdomain1(struct ifnet *ifp) 472 { 473 struct domain *dp; 474 int s; 475 476 s = splnet(); 477 478 /* 479 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 480 * cannot lock ifp->if_afdata initialization, entirely. 481 */ 482 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 483 splx(s); 484 return; 485 } 486 if (ifp->if_afdata_initialized) { 487 IF_AFDATA_UNLOCK(ifp); 488 splx(s); 489 return; 490 } 491 ifp->if_afdata_initialized = 1; 492 IF_AFDATA_UNLOCK(ifp); 493 494 /* address family dependent data region */ 495 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 496 for (dp = domains; dp; dp = dp->dom_next) { 497 if (dp->dom_ifattach) 498 ifp->if_afdata[dp->dom_family] = 499 (*dp->dom_ifattach)(ifp); 500 } 501 502 splx(s); 503 } 504 505 /* 506 * Detach an interface, removing it from the 507 * list of "active" interfaces. 508 */ 509 void 510 if_detach(struct ifnet *ifp) 511 { 512 struct ifaddr *ifa, *next; 513 struct radix_node_head *rnh; 514 int s; 515 int i; 516 struct domain *dp; 517 518 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 519 /* 520 * Remove routes and flush queues. 521 */ 522 s = splnet(); 523 if_down(ifp); 524 525 /* 526 * Remove address from ifindex_table[] and maybe decrement if_index. 527 * Clean up all addresses. 528 */ 529 ifaddr_byindex(ifp->if_index) = NULL; 530 destroy_dev(ifdev_byindex(ifp->if_index)); 531 ifdev_byindex(ifp->if_index) = NULL; 532 533 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 534 if_index--; 535 536 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) { 537 next = TAILQ_NEXT(ifa, ifa_link); 538 539 if (ifa->ifa_addr->sa_family == AF_LINK) 540 continue; 541 #ifdef INET 542 /* XXX: Ugly!! ad hoc just for INET */ 543 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 544 struct ifaliasreq ifr; 545 546 bzero(&ifr, sizeof(ifr)); 547 ifr.ifra_addr = *ifa->ifa_addr; 548 if (ifa->ifa_dstaddr) 549 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 550 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 551 NULL) == 0) 552 continue; 553 } 554 #endif /* INET */ 555 #ifdef INET6 556 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 557 in6_purgeaddr(ifa); 558 /* ifp_addrhead is already updated */ 559 continue; 560 } 561 #endif /* INET6 */ 562 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 563 IFAFREE(ifa); 564 } 565 566 #ifdef INET6 567 /* 568 * Remove all IPv6 kernel structs related to ifp. This should be done 569 * before removing routing entries below, since IPv6 interface direct 570 * routes are expected to be removed by the IPv6-specific kernel API. 571 * Otherwise, the kernel will detect some inconsistency and bark it. 572 */ 573 in6_ifdetach(ifp); 574 #endif 575 576 /* We can now free link ifaddr. */ 577 ifa = TAILQ_FIRST(&ifp->if_addrhead); 578 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 579 IFAFREE(ifa); 580 581 /* 582 * Delete all remaining routes using this interface 583 * Unfortuneatly the only way to do this is to slog through 584 * the entire routing table looking for routes which point 585 * to this interface...oh well... 586 */ 587 for (i = 1; i <= AF_MAX; i++) { 588 if ((rnh = rt_tables[i]) == NULL) 589 continue; 590 RADIX_NODE_HEAD_LOCK(rnh); 591 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 592 RADIX_NODE_HEAD_UNLOCK(rnh); 593 } 594 595 /* Announce that the interface is gone. */ 596 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 597 598 IF_AFDATA_LOCK(ifp); 599 for (dp = domains; dp; dp = dp->dom_next) { 600 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 601 (*dp->dom_ifdetach)(ifp, 602 ifp->if_afdata[dp->dom_family]); 603 } 604 IF_AFDATA_UNLOCK(ifp); 605 606 #ifdef MAC 607 mac_destroy_ifnet(ifp); 608 #endif /* MAC */ 609 KNOTE(&ifp->if_klist, NOTE_EXIT); 610 IFNET_WLOCK(); 611 TAILQ_REMOVE(&ifnet, ifp, if_link); 612 IFNET_WUNLOCK(); 613 mtx_destroy(&ifp->if_snd.ifq_mtx); 614 IF_AFDATA_DESTROY(ifp); 615 splx(s); 616 } 617 618 /* 619 * Delete Routes for a Network Interface 620 * 621 * Called for each routing entry via the rnh->rnh_walktree() call above 622 * to delete all route entries referencing a detaching network interface. 623 * 624 * Arguments: 625 * rn pointer to node in the routing table 626 * arg argument passed to rnh->rnh_walktree() - detaching interface 627 * 628 * Returns: 629 * 0 successful 630 * errno failed - reason indicated 631 * 632 */ 633 static int 634 if_rtdel(struct radix_node *rn, void *arg) 635 { 636 struct rtentry *rt = (struct rtentry *)rn; 637 struct ifnet *ifp = arg; 638 int err; 639 640 if (rt->rt_ifp == ifp) { 641 642 /* 643 * Protect (sorta) against walktree recursion problems 644 * with cloned routes 645 */ 646 if ((rt->rt_flags & RTF_UP) == 0) 647 return (0); 648 649 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 650 rt_mask(rt), rt->rt_flags, 651 (struct rtentry **) NULL); 652 if (err) { 653 log(LOG_WARNING, "if_rtdel: error %d\n", err); 654 } 655 } 656 657 return (0); 658 } 659 660 /* 661 * Create a clone network interface. 662 */ 663 int 664 if_clone_create(char *name, int len) 665 { 666 struct if_clone *ifc; 667 char *dp; 668 int wildcard, bytoff, bitoff; 669 int unit; 670 int err; 671 672 ifc = if_clone_lookup(name, &unit); 673 if (ifc == NULL) 674 return (EINVAL); 675 676 if (ifunit(name) != NULL) 677 return (EEXIST); 678 679 bytoff = bitoff = 0; 680 wildcard = (unit < 0); 681 /* 682 * Find a free unit if none was given. 683 */ 684 if (wildcard) { 685 while ((bytoff < ifc->ifc_bmlen) 686 && (ifc->ifc_units[bytoff] == 0xff)) 687 bytoff++; 688 if (bytoff >= ifc->ifc_bmlen) 689 return (ENOSPC); 690 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) 691 bitoff++; 692 unit = (bytoff << 3) + bitoff; 693 } 694 695 if (unit > ifc->ifc_maxunit) 696 return (ENXIO); 697 698 err = (*ifc->ifc_create)(ifc, unit); 699 if (err != 0) 700 return (err); 701 702 if (!wildcard) { 703 bytoff = unit >> 3; 704 bitoff = unit - (bytoff << 3); 705 } 706 707 /* 708 * Allocate the unit in the bitmap. 709 */ 710 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0, 711 ("%s: bit is already set", __func__)); 712 ifc->ifc_units[bytoff] |= (1 << bitoff); 713 714 /* In the wildcard case, we need to update the name. */ 715 if (wildcard) { 716 for (dp = name; *dp != '\0'; dp++); 717 if (snprintf(dp, len - (dp-name), "%d", unit) > 718 len - (dp-name) - 1) { 719 /* 720 * This can only be a programmer error and 721 * there's no straightforward way to recover if 722 * it happens. 723 */ 724 panic("if_clone_create(): interface name too long"); 725 } 726 727 } 728 729 return (0); 730 } 731 732 /* 733 * Destroy a clone network interface. 734 */ 735 int 736 if_clone_destroy(const char *name) 737 { 738 struct if_clone *ifc; 739 struct ifnet *ifp; 740 int bytoff, bitoff; 741 int unit; 742 743 ifp = ifunit(name); 744 if (ifp == NULL) 745 return (ENXIO); 746 747 unit = ifp->if_dunit; 748 749 ifc = if_clone_lookup(ifp->if_dname, NULL); 750 if (ifc == NULL) 751 return (EINVAL); 752 753 if (ifc->ifc_destroy == NULL) 754 return (EOPNOTSUPP); 755 756 (*ifc->ifc_destroy)(ifp); 757 758 /* 759 * Compute offset in the bitmap and deallocate the unit. 760 */ 761 bytoff = unit >> 3; 762 bitoff = unit - (bytoff << 3); 763 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0, 764 ("%s: bit is already cleared", __func__)); 765 ifc->ifc_units[bytoff] &= ~(1 << bitoff); 766 return (0); 767 } 768 769 /* 770 * Look up a network interface cloner. 771 */ 772 static struct if_clone * 773 if_clone_lookup(const char *name, int *unitp) 774 { 775 struct if_clone *ifc; 776 const char *cp; 777 int i; 778 779 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) { 780 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) { 781 if (ifc->ifc_name[i] != *cp) 782 goto next_ifc; 783 } 784 goto found_name; 785 next_ifc: 786 ifc = LIST_NEXT(ifc, ifc_list); 787 } 788 789 /* No match. */ 790 return ((struct if_clone *)NULL); 791 792 found_name: 793 if (*cp == '\0') { 794 i = -1; 795 } else { 796 for (i = 0; *cp != '\0'; cp++) { 797 if (*cp < '0' || *cp > '9') { 798 /* Bogus unit number. */ 799 return (NULL); 800 } 801 i = (i * 10) + (*cp - '0'); 802 } 803 } 804 805 if (unitp != NULL) 806 *unitp = i; 807 return (ifc); 808 } 809 810 /* 811 * Register a network interface cloner. 812 */ 813 void 814 if_clone_attach(struct if_clone *ifc) 815 { 816 int bytoff, bitoff; 817 int err; 818 int len, maxclone; 819 int unit; 820 821 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit, 822 ("%s: %s requested more units then allowed (%d > %d)", 823 __func__, ifc->ifc_name, ifc->ifc_minifs, 824 ifc->ifc_maxunit + 1)); 825 /* 826 * Compute bitmap size and allocate it. 827 */ 828 maxclone = ifc->ifc_maxunit + 1; 829 len = maxclone >> 3; 830 if ((len << 3) < maxclone) 831 len++; 832 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO); 833 ifc->ifc_bmlen = len; 834 835 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 836 if_cloners_count++; 837 838 for (unit = 0; unit < ifc->ifc_minifs; unit++) { 839 err = (*ifc->ifc_create)(ifc, unit); 840 KASSERT(err == 0, 841 ("%s: failed to create required interface %s%d", 842 __func__, ifc->ifc_name, unit)); 843 844 /* Allocate the unit in the bitmap. */ 845 bytoff = unit >> 3; 846 bitoff = unit - (bytoff << 3); 847 ifc->ifc_units[bytoff] |= (1 << bitoff); 848 } 849 EVENTHANDLER_INVOKE(if_clone_event, ifc); 850 } 851 852 /* 853 * Unregister a network interface cloner. 854 */ 855 void 856 if_clone_detach(struct if_clone *ifc) 857 { 858 859 LIST_REMOVE(ifc, ifc_list); 860 free(ifc->ifc_units, M_CLONE); 861 if_cloners_count--; 862 } 863 864 /* 865 * Provide list of interface cloners to userspace. 866 */ 867 static int 868 if_clone_list(struct if_clonereq *ifcr) 869 { 870 char outbuf[IFNAMSIZ], *dst; 871 struct if_clone *ifc; 872 int count, error = 0; 873 874 ifcr->ifcr_total = if_cloners_count; 875 if ((dst = ifcr->ifcr_buffer) == NULL) { 876 /* Just asking how many there are. */ 877 return (0); 878 } 879 880 if (ifcr->ifcr_count < 0) 881 return (EINVAL); 882 883 count = (if_cloners_count < ifcr->ifcr_count) ? 884 if_cloners_count : ifcr->ifcr_count; 885 886 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 887 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 888 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ); 889 error = copyout(outbuf, dst, IFNAMSIZ); 890 if (error) 891 break; 892 } 893 894 return (error); 895 } 896 897 #define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 898 899 /* 900 * Locate an interface based on a complete address. 901 */ 902 /*ARGSUSED*/ 903 struct ifaddr * 904 ifa_ifwithaddr(struct sockaddr *addr) 905 { 906 struct ifnet *ifp; 907 struct ifaddr *ifa; 908 909 IFNET_RLOCK(); 910 TAILQ_FOREACH(ifp, &ifnet, if_link) 911 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 912 if (ifa->ifa_addr->sa_family != addr->sa_family) 913 continue; 914 if (equal(addr, ifa->ifa_addr)) 915 goto done; 916 /* IP6 doesn't have broadcast */ 917 if ((ifp->if_flags & IFF_BROADCAST) && 918 ifa->ifa_broadaddr && 919 ifa->ifa_broadaddr->sa_len != 0 && 920 equal(ifa->ifa_broadaddr, addr)) 921 goto done; 922 } 923 ifa = NULL; 924 done: 925 IFNET_RUNLOCK(); 926 return (ifa); 927 } 928 929 /* 930 * Locate the point to point interface with a given destination address. 931 */ 932 /*ARGSUSED*/ 933 struct ifaddr * 934 ifa_ifwithdstaddr(struct sockaddr *addr) 935 { 936 struct ifnet *ifp; 937 struct ifaddr *ifa; 938 939 IFNET_RLOCK(); 940 TAILQ_FOREACH(ifp, &ifnet, if_link) { 941 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 942 continue; 943 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 944 if (ifa->ifa_addr->sa_family != addr->sa_family) 945 continue; 946 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 947 goto done; 948 } 949 } 950 ifa = NULL; 951 done: 952 IFNET_RUNLOCK(); 953 return (ifa); 954 } 955 956 /* 957 * Find an interface on a specific network. If many, choice 958 * is most specific found. 959 */ 960 struct ifaddr * 961 ifa_ifwithnet(struct sockaddr *addr) 962 { 963 struct ifnet *ifp; 964 struct ifaddr *ifa; 965 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 966 u_int af = addr->sa_family; 967 char *addr_data = addr->sa_data, *cplim; 968 969 /* 970 * AF_LINK addresses can be looked up directly by their index number, 971 * so do that if we can. 972 */ 973 if (af == AF_LINK) { 974 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 975 if (sdl->sdl_index && sdl->sdl_index <= if_index) 976 return (ifaddr_byindex(sdl->sdl_index)); 977 } 978 979 /* 980 * Scan though each interface, looking for ones that have 981 * addresses in this address family. 982 */ 983 IFNET_RLOCK(); 984 TAILQ_FOREACH(ifp, &ifnet, if_link) { 985 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 986 char *cp, *cp2, *cp3; 987 988 if (ifa->ifa_addr->sa_family != af) 989 next: continue; 990 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 991 /* 992 * This is a bit broken as it doesn't 993 * take into account that the remote end may 994 * be a single node in the network we are 995 * looking for. 996 * The trouble is that we don't know the 997 * netmask for the remote end. 998 */ 999 if (ifa->ifa_dstaddr != 0 1000 && equal(addr, ifa->ifa_dstaddr)) 1001 goto done; 1002 } else { 1003 /* 1004 * if we have a special address handler, 1005 * then use it instead of the generic one. 1006 */ 1007 if (ifa->ifa_claim_addr) { 1008 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1009 goto done; 1010 continue; 1011 } 1012 1013 /* 1014 * Scan all the bits in the ifa's address. 1015 * If a bit dissagrees with what we are 1016 * looking for, mask it with the netmask 1017 * to see if it really matters. 1018 * (A byte at a time) 1019 */ 1020 if (ifa->ifa_netmask == 0) 1021 continue; 1022 cp = addr_data; 1023 cp2 = ifa->ifa_addr->sa_data; 1024 cp3 = ifa->ifa_netmask->sa_data; 1025 cplim = ifa->ifa_netmask->sa_len 1026 + (char *)ifa->ifa_netmask; 1027 while (cp3 < cplim) 1028 if ((*cp++ ^ *cp2++) & *cp3++) 1029 goto next; /* next address! */ 1030 /* 1031 * If the netmask of what we just found 1032 * is more specific than what we had before 1033 * (if we had one) then remember the new one 1034 * before continuing to search 1035 * for an even better one. 1036 */ 1037 if (ifa_maybe == 0 || 1038 rn_refines((caddr_t)ifa->ifa_netmask, 1039 (caddr_t)ifa_maybe->ifa_netmask)) 1040 ifa_maybe = ifa; 1041 } 1042 } 1043 } 1044 ifa = ifa_maybe; 1045 done: 1046 IFNET_RUNLOCK(); 1047 return (ifa); 1048 } 1049 1050 /* 1051 * Find an interface address specific to an interface best matching 1052 * a given address. 1053 */ 1054 struct ifaddr * 1055 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1056 { 1057 struct ifaddr *ifa; 1058 char *cp, *cp2, *cp3; 1059 char *cplim; 1060 struct ifaddr *ifa_maybe = 0; 1061 u_int af = addr->sa_family; 1062 1063 if (af >= AF_MAX) 1064 return (0); 1065 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1066 if (ifa->ifa_addr->sa_family != af) 1067 continue; 1068 if (ifa_maybe == 0) 1069 ifa_maybe = ifa; 1070 if (ifa->ifa_netmask == 0) { 1071 if (equal(addr, ifa->ifa_addr) || 1072 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 1073 goto done; 1074 continue; 1075 } 1076 if (ifp->if_flags & IFF_POINTOPOINT) { 1077 if (equal(addr, ifa->ifa_dstaddr)) 1078 goto done; 1079 } else { 1080 cp = addr->sa_data; 1081 cp2 = ifa->ifa_addr->sa_data; 1082 cp3 = ifa->ifa_netmask->sa_data; 1083 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1084 for (; cp3 < cplim; cp3++) 1085 if ((*cp++ ^ *cp2++) & *cp3) 1086 break; 1087 if (cp3 == cplim) 1088 goto done; 1089 } 1090 } 1091 ifa = ifa_maybe; 1092 done: 1093 return (ifa); 1094 } 1095 1096 #include <net/route.h> 1097 1098 /* 1099 * Default action when installing a route with a Link Level gateway. 1100 * Lookup an appropriate real ifa to point to. 1101 * This should be moved to /sys/net/link.c eventually. 1102 */ 1103 static void 1104 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1105 { 1106 struct ifaddr *ifa, *oifa; 1107 struct sockaddr *dst; 1108 struct ifnet *ifp; 1109 1110 RT_LOCK_ASSERT(rt); 1111 1112 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1113 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1114 return; 1115 ifa = ifaof_ifpforaddr(dst, ifp); 1116 if (ifa) { 1117 IFAREF(ifa); /* XXX */ 1118 oifa = rt->rt_ifa; 1119 rt->rt_ifa = ifa; 1120 IFAFREE(oifa); 1121 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1122 ifa->ifa_rtrequest(cmd, rt, info); 1123 } 1124 } 1125 1126 /* 1127 * Mark an interface down and notify protocols of 1128 * the transition. 1129 * NOTE: must be called at splnet or eqivalent. 1130 */ 1131 void 1132 if_unroute(struct ifnet *ifp, int flag, int fam) 1133 { 1134 struct ifaddr *ifa; 1135 1136 ifp->if_flags &= ~flag; 1137 getmicrotime(&ifp->if_lastchange); 1138 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1139 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1140 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1141 if_qflush(&ifp->if_snd); 1142 rt_ifmsg(ifp); 1143 } 1144 1145 /* 1146 * Mark an interface up and notify protocols of 1147 * the transition. 1148 * NOTE: must be called at splnet or eqivalent. 1149 */ 1150 void 1151 if_route(struct ifnet *ifp, int flag, int fam) 1152 { 1153 struct ifaddr *ifa; 1154 1155 ifp->if_flags |= flag; 1156 getmicrotime(&ifp->if_lastchange); 1157 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1158 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1159 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1160 rt_ifmsg(ifp); 1161 #ifdef INET6 1162 in6_if_up(ifp); 1163 #endif 1164 } 1165 1166 /* 1167 * Mark an interface down and notify protocols of 1168 * the transition. 1169 * NOTE: must be called at splnet or eqivalent. 1170 */ 1171 void 1172 if_down(struct ifnet *ifp) 1173 { 1174 1175 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1176 } 1177 1178 /* 1179 * Mark an interface up and notify protocols of 1180 * the transition. 1181 * NOTE: must be called at splnet or eqivalent. 1182 */ 1183 void 1184 if_up(struct ifnet *ifp) 1185 { 1186 1187 if_route(ifp, IFF_UP, AF_UNSPEC); 1188 } 1189 1190 /* 1191 * Flush an interface queue. 1192 */ 1193 static void 1194 if_qflush(struct ifqueue *ifq) 1195 { 1196 struct mbuf *m, *n; 1197 1198 n = ifq->ifq_head; 1199 while ((m = n) != 0) { 1200 n = m->m_act; 1201 m_freem(m); 1202 } 1203 ifq->ifq_head = 0; 1204 ifq->ifq_tail = 0; 1205 ifq->ifq_len = 0; 1206 } 1207 1208 /* 1209 * Handle interface watchdog timer routines. Called 1210 * from softclock, we decrement timers (if set) and 1211 * call the appropriate interface routine on expiration. 1212 */ 1213 static void 1214 if_slowtimo(void *arg) 1215 { 1216 struct ifnet *ifp; 1217 int s = splimp(); 1218 1219 IFNET_RLOCK(); 1220 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1221 if (ifp->if_timer == 0 || --ifp->if_timer) 1222 continue; 1223 if (ifp->if_watchdog) 1224 (*ifp->if_watchdog)(ifp); 1225 } 1226 IFNET_RUNLOCK(); 1227 splx(s); 1228 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1229 } 1230 1231 /* 1232 * Map interface name to 1233 * interface structure pointer. 1234 */ 1235 struct ifnet * 1236 ifunit(const char *name) 1237 { 1238 struct ifnet *ifp; 1239 1240 IFNET_RLOCK(); 1241 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1242 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1243 break; 1244 } 1245 IFNET_RUNLOCK(); 1246 return (ifp); 1247 } 1248 1249 /* 1250 * Hardware specific interface ioctls. 1251 */ 1252 static int 1253 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1254 { 1255 struct ifreq *ifr; 1256 struct ifstat *ifs; 1257 int error = 0; 1258 int new_flags; 1259 size_t namelen, onamelen; 1260 char new_name[IFNAMSIZ]; 1261 struct ifaddr *ifa; 1262 struct sockaddr_dl *sdl; 1263 1264 ifr = (struct ifreq *)data; 1265 switch (cmd) { 1266 case SIOCGIFINDEX: 1267 ifr->ifr_index = ifp->if_index; 1268 break; 1269 1270 case SIOCGIFFLAGS: 1271 ifr->ifr_flags = ifp->if_flags & 0xffff; 1272 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1273 break; 1274 1275 case SIOCGIFCAP: 1276 ifr->ifr_reqcap = ifp->if_capabilities; 1277 ifr->ifr_curcap = ifp->if_capenable; 1278 break; 1279 1280 #ifdef MAC 1281 case SIOCGIFMAC: 1282 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1283 break; 1284 #endif 1285 1286 case SIOCGIFMETRIC: 1287 ifr->ifr_metric = ifp->if_metric; 1288 break; 1289 1290 case SIOCGIFMTU: 1291 ifr->ifr_mtu = ifp->if_mtu; 1292 break; 1293 1294 case SIOCGIFPHYS: 1295 ifr->ifr_phys = ifp->if_physical; 1296 break; 1297 1298 case SIOCSIFFLAGS: 1299 error = suser(td); 1300 if (error) 1301 return (error); 1302 new_flags = (ifr->ifr_flags & 0xffff) | 1303 (ifr->ifr_flagshigh << 16); 1304 if (ifp->if_flags & IFF_SMART) { 1305 /* Smart drivers twiddle their own routes */ 1306 } else if (ifp->if_flags & IFF_UP && 1307 (new_flags & IFF_UP) == 0) { 1308 int s = splimp(); 1309 if_down(ifp); 1310 splx(s); 1311 } else if (new_flags & IFF_UP && 1312 (ifp->if_flags & IFF_UP) == 0) { 1313 int s = splimp(); 1314 if_up(ifp); 1315 splx(s); 1316 } 1317 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1318 (new_flags &~ IFF_CANTCHANGE); 1319 if (new_flags & IFF_PPROMISC) { 1320 /* Permanently promiscuous mode requested */ 1321 ifp->if_flags |= IFF_PROMISC; 1322 } else if (ifp->if_pcount == 0) { 1323 ifp->if_flags &= ~IFF_PROMISC; 1324 } 1325 if (ifp->if_ioctl) 1326 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1327 getmicrotime(&ifp->if_lastchange); 1328 break; 1329 1330 case SIOCSIFCAP: 1331 error = suser(td); 1332 if (error) 1333 return (error); 1334 if (ifp->if_ioctl == NULL) 1335 return (EOPNOTSUPP); 1336 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1337 return (EINVAL); 1338 error = (*ifp->if_ioctl)(ifp, cmd, data); 1339 if (error == 0) 1340 getmicrotime(&ifp->if_lastchange); 1341 break; 1342 1343 #ifdef MAC 1344 case SIOCSIFMAC: 1345 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1346 break; 1347 #endif 1348 1349 case SIOCSIFNAME: 1350 error = suser(td); 1351 if (error != 0) 1352 return (error); 1353 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1354 if (error != 0) 1355 return (error); 1356 if (new_name[0] == '\0') 1357 return (EINVAL); 1358 if (ifunit(new_name) != NULL) 1359 return (EEXIST); 1360 1361 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1362 /* Announce the departure of the interface. */ 1363 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1364 1365 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1366 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1367 IFA_LOCK(ifa); 1368 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1369 namelen = strlen(new_name); 1370 onamelen = sdl->sdl_nlen; 1371 /* 1372 * Move the address if needed. This is safe because we 1373 * allocate space for a name of length IFNAMSIZ when we 1374 * create this in if_attach(). 1375 */ 1376 if (namelen != onamelen) { 1377 bcopy(sdl->sdl_data + onamelen, 1378 sdl->sdl_data + namelen, sdl->sdl_alen); 1379 } 1380 bcopy(new_name, sdl->sdl_data, namelen); 1381 sdl->sdl_nlen = namelen; 1382 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1383 bzero(sdl->sdl_data, onamelen); 1384 while (namelen != 0) 1385 sdl->sdl_data[--namelen] = 0xff; 1386 IFA_UNLOCK(ifa); 1387 1388 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1389 /* Announce the return of the interface. */ 1390 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1391 break; 1392 1393 case SIOCSIFMETRIC: 1394 error = suser(td); 1395 if (error) 1396 return (error); 1397 ifp->if_metric = ifr->ifr_metric; 1398 getmicrotime(&ifp->if_lastchange); 1399 break; 1400 1401 case SIOCSIFPHYS: 1402 error = suser(td); 1403 if (error) 1404 return (error); 1405 if (ifp->if_ioctl == NULL) 1406 return (EOPNOTSUPP); 1407 error = (*ifp->if_ioctl)(ifp, cmd, data); 1408 if (error == 0) 1409 getmicrotime(&ifp->if_lastchange); 1410 break; 1411 1412 case SIOCSIFMTU: 1413 { 1414 u_long oldmtu = ifp->if_mtu; 1415 1416 error = suser(td); 1417 if (error) 1418 return (error); 1419 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1420 return (EINVAL); 1421 if (ifp->if_ioctl == NULL) 1422 return (EOPNOTSUPP); 1423 error = (*ifp->if_ioctl)(ifp, cmd, data); 1424 if (error == 0) { 1425 getmicrotime(&ifp->if_lastchange); 1426 rt_ifmsg(ifp); 1427 } 1428 /* 1429 * If the link MTU changed, do network layer specific procedure. 1430 */ 1431 if (ifp->if_mtu != oldmtu) { 1432 #ifdef INET6 1433 nd6_setmtu(ifp); 1434 #endif 1435 } 1436 break; 1437 } 1438 1439 case SIOCADDMULTI: 1440 case SIOCDELMULTI: 1441 error = suser(td); 1442 if (error) 1443 return (error); 1444 1445 /* Don't allow group membership on non-multicast interfaces. */ 1446 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1447 return (EOPNOTSUPP); 1448 1449 /* Don't let users screw up protocols' entries. */ 1450 if (ifr->ifr_addr.sa_family != AF_LINK) 1451 return (EINVAL); 1452 1453 if (cmd == SIOCADDMULTI) { 1454 struct ifmultiaddr *ifma; 1455 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1456 } else { 1457 error = if_delmulti(ifp, &ifr->ifr_addr); 1458 } 1459 if (error == 0) 1460 getmicrotime(&ifp->if_lastchange); 1461 break; 1462 1463 case SIOCSIFPHYADDR: 1464 case SIOCDIFPHYADDR: 1465 #ifdef INET6 1466 case SIOCSIFPHYADDR_IN6: 1467 #endif 1468 case SIOCSLIFPHYADDR: 1469 case SIOCSIFMEDIA: 1470 case SIOCSIFGENERIC: 1471 error = suser(td); 1472 if (error) 1473 return (error); 1474 if (ifp->if_ioctl == NULL) 1475 return (EOPNOTSUPP); 1476 error = (*ifp->if_ioctl)(ifp, cmd, data); 1477 if (error == 0) 1478 getmicrotime(&ifp->if_lastchange); 1479 break; 1480 1481 case SIOCGIFSTATUS: 1482 ifs = (struct ifstat *)data; 1483 ifs->ascii[0] = '\0'; 1484 1485 case SIOCGIFPSRCADDR: 1486 case SIOCGIFPDSTADDR: 1487 case SIOCGLIFPHYADDR: 1488 case SIOCGIFMEDIA: 1489 case SIOCGIFGENERIC: 1490 if (ifp->if_ioctl == NULL) 1491 return (EOPNOTSUPP); 1492 error = (*ifp->if_ioctl)(ifp, cmd, data); 1493 break; 1494 1495 case SIOCSIFLLADDR: 1496 error = suser(td); 1497 if (error) 1498 return (error); 1499 error = if_setlladdr(ifp, 1500 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1501 break; 1502 1503 default: 1504 error = ENOIOCTL; 1505 break; 1506 } 1507 return (error); 1508 } 1509 1510 /* 1511 * Interface ioctls. 1512 */ 1513 int 1514 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1515 { 1516 struct ifnet *ifp; 1517 struct ifreq *ifr; 1518 int error; 1519 int oif_flags; 1520 1521 switch (cmd) { 1522 case SIOCGIFCONF: 1523 case OSIOCGIFCONF: 1524 return (ifconf(cmd, data)); 1525 } 1526 ifr = (struct ifreq *)data; 1527 1528 switch (cmd) { 1529 case SIOCIFCREATE: 1530 case SIOCIFDESTROY: 1531 if ((error = suser(td)) != 0) 1532 return (error); 1533 return ((cmd == SIOCIFCREATE) ? 1534 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1535 if_clone_destroy(ifr->ifr_name)); 1536 1537 case SIOCIFGCLONERS: 1538 return (if_clone_list((struct if_clonereq *)data)); 1539 } 1540 1541 ifp = ifunit(ifr->ifr_name); 1542 if (ifp == 0) 1543 return (ENXIO); 1544 1545 error = ifhwioctl(cmd, ifp, data, td); 1546 if (error != ENOIOCTL) 1547 return (error); 1548 1549 oif_flags = ifp->if_flags; 1550 if (so->so_proto == 0) 1551 return (EOPNOTSUPP); 1552 #ifndef COMPAT_43 1553 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1554 data, 1555 ifp, td)); 1556 #else 1557 { 1558 int ocmd = cmd; 1559 1560 switch (cmd) { 1561 1562 case SIOCSIFDSTADDR: 1563 case SIOCSIFADDR: 1564 case SIOCSIFBRDADDR: 1565 case SIOCSIFNETMASK: 1566 #if BYTE_ORDER != BIG_ENDIAN 1567 if (ifr->ifr_addr.sa_family == 0 && 1568 ifr->ifr_addr.sa_len < 16) { 1569 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1570 ifr->ifr_addr.sa_len = 16; 1571 } 1572 #else 1573 if (ifr->ifr_addr.sa_len == 0) 1574 ifr->ifr_addr.sa_len = 16; 1575 #endif 1576 break; 1577 1578 case OSIOCGIFADDR: 1579 cmd = SIOCGIFADDR; 1580 break; 1581 1582 case OSIOCGIFDSTADDR: 1583 cmd = SIOCGIFDSTADDR; 1584 break; 1585 1586 case OSIOCGIFBRDADDR: 1587 cmd = SIOCGIFBRDADDR; 1588 break; 1589 1590 case OSIOCGIFNETMASK: 1591 cmd = SIOCGIFNETMASK; 1592 } 1593 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1594 cmd, 1595 data, 1596 ifp, td)); 1597 switch (ocmd) { 1598 1599 case OSIOCGIFADDR: 1600 case OSIOCGIFDSTADDR: 1601 case OSIOCGIFBRDADDR: 1602 case OSIOCGIFNETMASK: 1603 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1604 1605 } 1606 } 1607 #endif /* COMPAT_43 */ 1608 1609 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1610 #ifdef INET6 1611 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1612 if (ifp->if_flags & IFF_UP) { 1613 int s = splimp(); 1614 in6_if_up(ifp); 1615 splx(s); 1616 } 1617 #endif 1618 } 1619 return (error); 1620 } 1621 1622 /* 1623 * Set/clear promiscuous mode on interface ifp based on the truth value 1624 * of pswitch. The calls are reference counted so that only the first 1625 * "on" request actually has an effect, as does the final "off" request. 1626 * Results are undefined if the "off" and "on" requests are not matched. 1627 */ 1628 int 1629 ifpromisc(struct ifnet *ifp, int pswitch) 1630 { 1631 struct ifreq ifr; 1632 int error; 1633 int oldflags, oldpcount; 1634 1635 oldpcount = ifp->if_pcount; 1636 oldflags = ifp->if_flags; 1637 if (ifp->if_flags & IFF_PPROMISC) { 1638 /* Do nothing if device is in permanently promiscuous mode */ 1639 ifp->if_pcount += pswitch ? 1 : -1; 1640 return (0); 1641 } 1642 if (pswitch) { 1643 /* 1644 * If the device is not configured up, we cannot put it in 1645 * promiscuous mode. 1646 */ 1647 if ((ifp->if_flags & IFF_UP) == 0) 1648 return (ENETDOWN); 1649 if (ifp->if_pcount++ != 0) 1650 return (0); 1651 ifp->if_flags |= IFF_PROMISC; 1652 } else { 1653 if (--ifp->if_pcount > 0) 1654 return (0); 1655 ifp->if_flags &= ~IFF_PROMISC; 1656 } 1657 ifr.ifr_flags = ifp->if_flags & 0xffff; 1658 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1659 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1660 if (error == 0) { 1661 log(LOG_INFO, "%s: promiscuous mode %s\n", 1662 ifp->if_xname, 1663 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1664 rt_ifmsg(ifp); 1665 } else { 1666 ifp->if_pcount = oldpcount; 1667 ifp->if_flags = oldflags; 1668 } 1669 return error; 1670 } 1671 1672 /* 1673 * Return interface configuration 1674 * of system. List may be used 1675 * in later ioctl's (above) to get 1676 * other information. 1677 */ 1678 /*ARGSUSED*/ 1679 static int 1680 ifconf(u_long cmd, caddr_t data) 1681 { 1682 struct ifconf *ifc = (struct ifconf *)data; 1683 struct ifnet *ifp; 1684 struct ifaddr *ifa; 1685 struct ifreq ifr, *ifrp; 1686 int space = ifc->ifc_len, error = 0; 1687 1688 ifrp = ifc->ifc_req; 1689 IFNET_RLOCK(); /* could sleep XXX */ 1690 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1691 int addrs; 1692 1693 if (space < sizeof(ifr)) 1694 break; 1695 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1696 >= sizeof(ifr.ifr_name)) { 1697 error = ENAMETOOLONG; 1698 break; 1699 } 1700 1701 addrs = 0; 1702 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1703 struct sockaddr *sa = ifa->ifa_addr; 1704 1705 if (space < sizeof(ifr)) 1706 break; 1707 if (jailed(curthread->td_ucred) && 1708 prison_if(curthread->td_ucred, sa)) 1709 continue; 1710 addrs++; 1711 #ifdef COMPAT_43 1712 if (cmd == OSIOCGIFCONF) { 1713 struct osockaddr *osa = 1714 (struct osockaddr *)&ifr.ifr_addr; 1715 ifr.ifr_addr = *sa; 1716 osa->sa_family = sa->sa_family; 1717 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1718 sizeof (ifr)); 1719 ifrp++; 1720 } else 1721 #endif 1722 if (sa->sa_len <= sizeof(*sa)) { 1723 ifr.ifr_addr = *sa; 1724 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1725 sizeof (ifr)); 1726 ifrp++; 1727 } else { 1728 if (space < sizeof (ifr) + sa->sa_len - 1729 sizeof(*sa)) 1730 break; 1731 space -= sa->sa_len - sizeof(*sa); 1732 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1733 sizeof (ifr.ifr_name)); 1734 if (error == 0) 1735 error = copyout((caddr_t)sa, 1736 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1737 ifrp = (struct ifreq *) 1738 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1739 } 1740 if (error) 1741 break; 1742 space -= sizeof (ifr); 1743 } 1744 if (error) 1745 break; 1746 if (!addrs) { 1747 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1748 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1749 sizeof (ifr)); 1750 if (error) 1751 break; 1752 space -= sizeof (ifr); 1753 ifrp++; 1754 } 1755 } 1756 IFNET_RUNLOCK(); 1757 ifc->ifc_len -= space; 1758 return (error); 1759 } 1760 1761 /* 1762 * Just like if_promisc(), but for all-multicast-reception mode. 1763 */ 1764 int 1765 if_allmulti(struct ifnet *ifp, int onswitch) 1766 { 1767 int error = 0; 1768 int s = splimp(); 1769 struct ifreq ifr; 1770 1771 if (onswitch) { 1772 if (ifp->if_amcount++ == 0) { 1773 ifp->if_flags |= IFF_ALLMULTI; 1774 ifr.ifr_flags = ifp->if_flags & 0xffff; 1775 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1776 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1777 } 1778 } else { 1779 if (ifp->if_amcount > 1) { 1780 ifp->if_amcount--; 1781 } else { 1782 ifp->if_amcount = 0; 1783 ifp->if_flags &= ~IFF_ALLMULTI; 1784 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1785 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1786 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1787 } 1788 } 1789 splx(s); 1790 1791 if (error == 0) 1792 rt_ifmsg(ifp); 1793 return error; 1794 } 1795 1796 /* 1797 * Add a multicast listenership to the interface in question. 1798 * The link layer provides a routine which converts 1799 */ 1800 int 1801 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1802 { 1803 struct sockaddr *llsa, *dupsa; 1804 int error, s; 1805 struct ifmultiaddr *ifma; 1806 1807 /* 1808 * If the matching multicast address already exists 1809 * then don't add a new one, just add a reference 1810 */ 1811 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1812 if (equal(sa, ifma->ifma_addr)) { 1813 ifma->ifma_refcount++; 1814 if (retifma) 1815 *retifma = ifma; 1816 return 0; 1817 } 1818 } 1819 1820 /* 1821 * Give the link layer a chance to accept/reject it, and also 1822 * find out which AF_LINK address this maps to, if it isn't one 1823 * already. 1824 */ 1825 if (ifp->if_resolvemulti) { 1826 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1827 if (error) return error; 1828 } else { 1829 llsa = 0; 1830 } 1831 1832 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1833 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1834 bcopy(sa, dupsa, sa->sa_len); 1835 1836 ifma->ifma_addr = dupsa; 1837 ifma->ifma_lladdr = llsa; 1838 ifma->ifma_ifp = ifp; 1839 ifma->ifma_refcount = 1; 1840 ifma->ifma_protospec = 0; 1841 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1842 1843 /* 1844 * Some network interfaces can scan the address list at 1845 * interrupt time; lock them out. 1846 */ 1847 s = splimp(); 1848 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1849 splx(s); 1850 if (retifma != NULL) 1851 *retifma = ifma; 1852 1853 if (llsa != 0) { 1854 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1855 if (equal(ifma->ifma_addr, llsa)) 1856 break; 1857 } 1858 if (ifma) { 1859 ifma->ifma_refcount++; 1860 } else { 1861 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1862 M_IFMADDR, M_WAITOK); 1863 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1864 M_IFMADDR, M_WAITOK); 1865 bcopy(llsa, dupsa, llsa->sa_len); 1866 ifma->ifma_addr = dupsa; 1867 ifma->ifma_lladdr = NULL; 1868 ifma->ifma_ifp = ifp; 1869 ifma->ifma_refcount = 1; 1870 ifma->ifma_protospec = 0; 1871 s = splimp(); 1872 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1873 splx(s); 1874 } 1875 } 1876 /* 1877 * We are certain we have added something, so call down to the 1878 * interface to let them know about it. 1879 */ 1880 s = splimp(); 1881 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1882 splx(s); 1883 1884 return 0; 1885 } 1886 1887 /* 1888 * Remove a reference to a multicast address on this interface. Yell 1889 * if the request does not match an existing membership. 1890 */ 1891 int 1892 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1893 { 1894 struct ifmultiaddr *ifma; 1895 int s; 1896 1897 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1898 if (equal(sa, ifma->ifma_addr)) 1899 break; 1900 if (ifma == 0) 1901 return ENOENT; 1902 1903 if (ifma->ifma_refcount > 1) { 1904 ifma->ifma_refcount--; 1905 return 0; 1906 } 1907 1908 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1909 sa = ifma->ifma_lladdr; 1910 s = splimp(); 1911 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1912 /* 1913 * Make sure the interface driver is notified 1914 * in the case of a link layer mcast group being left. 1915 */ 1916 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1917 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1918 splx(s); 1919 free(ifma->ifma_addr, M_IFMADDR); 1920 free(ifma, M_IFMADDR); 1921 if (sa == 0) 1922 return 0; 1923 1924 /* 1925 * Now look for the link-layer address which corresponds to 1926 * this network address. It had been squirreled away in 1927 * ifma->ifma_lladdr for this purpose (so we don't have 1928 * to call ifp->if_resolvemulti() again), and we saved that 1929 * value in sa above. If some nasty deleted the 1930 * link-layer address out from underneath us, we can deal because 1931 * the address we stored was is not the same as the one which was 1932 * in the record for the link-layer address. (So we don't complain 1933 * in that case.) 1934 */ 1935 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1936 if (equal(sa, ifma->ifma_addr)) 1937 break; 1938 if (ifma == 0) 1939 return 0; 1940 1941 if (ifma->ifma_refcount > 1) { 1942 ifma->ifma_refcount--; 1943 return 0; 1944 } 1945 1946 s = splimp(); 1947 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1948 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1949 splx(s); 1950 free(ifma->ifma_addr, M_IFMADDR); 1951 free(sa, M_IFMADDR); 1952 free(ifma, M_IFMADDR); 1953 1954 return 0; 1955 } 1956 1957 /* 1958 * Set the link layer address on an interface. 1959 * 1960 * At this time we only support certain types of interfaces, 1961 * and we don't allow the length of the address to change. 1962 */ 1963 int 1964 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1965 { 1966 struct sockaddr_dl *sdl; 1967 struct ifaddr *ifa; 1968 struct ifreq ifr; 1969 1970 ifa = ifaddr_byindex(ifp->if_index); 1971 if (ifa == NULL) 1972 return (EINVAL); 1973 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1974 if (sdl == NULL) 1975 return (EINVAL); 1976 if (len != sdl->sdl_alen) /* don't allow length to change */ 1977 return (EINVAL); 1978 switch (ifp->if_type) { 1979 case IFT_ETHER: /* these types use struct arpcom */ 1980 case IFT_FDDI: 1981 case IFT_XETHER: 1982 case IFT_ISO88025: 1983 case IFT_L2VLAN: 1984 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len); 1985 /* FALLTHROUGH */ 1986 case IFT_ARCNET: 1987 bcopy(lladdr, LLADDR(sdl), len); 1988 break; 1989 default: 1990 return (ENODEV); 1991 } 1992 /* 1993 * If the interface is already up, we need 1994 * to re-init it in order to reprogram its 1995 * address filter. 1996 */ 1997 if ((ifp->if_flags & IFF_UP) != 0) { 1998 ifp->if_flags &= ~IFF_UP; 1999 ifr.ifr_flags = ifp->if_flags & 0xffff; 2000 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2001 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2002 ifp->if_flags |= IFF_UP; 2003 ifr.ifr_flags = ifp->if_flags & 0xffff; 2004 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2005 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2006 #ifdef INET 2007 /* 2008 * Also send gratuitous ARPs to notify other nodes about 2009 * the address change. 2010 */ 2011 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2012 if (ifa->ifa_addr != NULL && 2013 ifa->ifa_addr->sa_family == AF_INET) 2014 arp_ifinit(ifp, ifa); 2015 } 2016 #endif 2017 } 2018 return (0); 2019 } 2020 2021 struct ifmultiaddr * 2022 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 2023 { 2024 struct ifmultiaddr *ifma; 2025 2026 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 2027 if (equal(ifma->ifma_addr, sa)) 2028 break; 2029 2030 return ifma; 2031 } 2032 2033 /* 2034 * The name argument must be a pointer to storage which will last as 2035 * long as the interface does. For physical devices, the result of 2036 * device_get_name(dev) is a good choice and for pseudo-devices a 2037 * static string works well. 2038 */ 2039 void 2040 if_initname(struct ifnet *ifp, const char *name, int unit) 2041 { 2042 ifp->if_dname = name; 2043 ifp->if_dunit = unit; 2044 if (unit != IF_DUNIT_NONE) 2045 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2046 else 2047 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2048 } 2049 2050 int 2051 if_printf(struct ifnet *ifp, const char * fmt, ...) 2052 { 2053 va_list ap; 2054 int retval; 2055 2056 retval = printf("%s: ", ifp->if_xname); 2057 va_start(ap, fmt); 2058 retval += vprintf(fmt, ap); 2059 va_end(ap); 2060 return (retval); 2061 } 2062 2063 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 2064 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 2065