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_dl.h> 60 #include <net/if_types.h> 61 #include <net/if_var.h> 62 #include <net/radix.h> 63 #include <net/route.h> 64 65 #if defined(INET) || defined(INET6) 66 /*XXX*/ 67 #include <netinet/in.h> 68 #include <netinet/in_var.h> 69 #ifdef INET6 70 #include <netinet6/in6_var.h> 71 #include <netinet6/in6_ifattach.h> 72 #endif 73 #endif 74 #ifdef INET 75 #include <netinet/if_ether.h> 76 #endif 77 78 static void if_attachdomain(void *); 79 static void if_attachdomain1(struct ifnet *); 80 static int ifconf(u_long, caddr_t); 81 static void if_grow(void); 82 static void if_init(void *); 83 static void if_check(void *); 84 static int if_findindex(struct ifnet *); 85 static void if_qflush(struct ifqueue *); 86 static void if_route(struct ifnet *, int flag, int fam); 87 static void if_slowtimo(void *); 88 static void if_unroute(struct ifnet *, int flag, int fam); 89 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 90 static int if_rtdel(struct radix_node *, void *); 91 static struct if_clone *if_clone_lookup(const char *, int *); 92 static int if_clone_list(struct if_clonereq *); 93 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 94 #ifdef INET6 95 /* 96 * XXX: declare here to avoid to include many inet6 related files.. 97 * should be more generalized? 98 */ 99 extern void nd6_setmtu(struct ifnet *); 100 #endif 101 102 int if_index = 0; 103 struct ifindex_entry *ifindex_table = NULL; 104 int ifqmaxlen = IFQ_MAXLEN; 105 struct ifnethead ifnet; /* depend on static init XXX */ 106 struct mtx ifnet_lock; 107 static int if_cloners_count; 108 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 109 110 static int if_indexlim = 8; 111 static struct klist ifklist; 112 113 static void filt_netdetach(struct knote *kn); 114 static int filt_netdev(struct knote *kn, long hint); 115 116 static struct filterops netdev_filtops = 117 { 1, NULL, filt_netdetach, filt_netdev }; 118 119 /* 120 * System initialization 121 */ 122 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 123 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 124 125 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 126 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 127 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 128 129 static d_open_t netopen; 130 static d_close_t netclose; 131 static d_ioctl_t netioctl; 132 static d_kqfilter_t netkqfilter; 133 134 static struct cdevsw net_cdevsw = { 135 .d_version = D_VERSION, 136 .d_flags = D_NEEDGIANT, 137 .d_open = netopen, 138 .d_close = netclose, 139 .d_ioctl = netioctl, 140 .d_name = "net", 141 .d_kqfilter = netkqfilter, 142 }; 143 144 static int 145 netopen(dev_t dev, int flag, int mode, struct thread *td) 146 { 147 return (0); 148 } 149 150 static int 151 netclose(dev_t dev, int flags, int fmt, struct thread *td) 152 { 153 return (0); 154 } 155 156 static int 157 netioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) 158 { 159 struct ifnet *ifp; 160 int error, idx; 161 162 /* only support interface specific ioctls */ 163 if (IOCGROUP(cmd) != 'i') 164 return (EOPNOTSUPP); 165 idx = minor(dev); 166 if (idx == 0) { 167 /* 168 * special network device, not interface. 169 */ 170 if (cmd == SIOCGIFCONF) 171 return (ifconf(cmd, data)); /* XXX remove cmd */ 172 return (EOPNOTSUPP); 173 } 174 175 ifp = ifnet_byindex(idx); 176 if (ifp == NULL) 177 return (ENXIO); 178 179 error = ifhwioctl(cmd, ifp, data, td); 180 if (error == ENOIOCTL) 181 error = EOPNOTSUPP; 182 return (error); 183 } 184 185 static int 186 netkqfilter(dev_t dev, struct knote *kn) 187 { 188 struct klist *klist; 189 struct ifnet *ifp; 190 int idx; 191 192 idx = minor(dev); 193 if (idx == 0) { 194 klist = &ifklist; 195 } else { 196 ifp = ifnet_byindex(idx); 197 if (ifp == NULL) 198 return (1); 199 klist = &ifp->if_klist; 200 } 201 202 switch (kn->kn_filter) { 203 case EVFILT_NETDEV: 204 kn->kn_fop = &netdev_filtops; 205 break; 206 default: 207 return (1); 208 } 209 210 kn->kn_hook = (caddr_t)klist; 211 212 /* XXX locking? */ 213 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 214 215 return (0); 216 } 217 218 static void 219 filt_netdetach(struct knote *kn) 220 { 221 struct klist *klist = (struct klist *)kn->kn_hook; 222 223 if (kn->kn_status & KN_DETACHED) 224 return; 225 SLIST_REMOVE(klist, kn, knote, kn_selnext); 226 } 227 228 static int 229 filt_netdev(struct knote *kn, long hint) 230 { 231 232 /* 233 * Currently NOTE_EXIT is abused to indicate device detach. 234 */ 235 if (hint == NOTE_EXIT) { 236 kn->kn_data = NOTE_LINKINV; 237 kn->kn_status |= KN_DETACHED; 238 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 239 return (1); 240 } 241 kn->kn_data = hint; /* current status */ 242 if (kn->kn_sfflags & hint) 243 kn->kn_fflags |= hint; 244 return (kn->kn_fflags != 0); 245 } 246 247 /* 248 * Network interface utility routines. 249 * 250 * Routines with ifa_ifwith* names take sockaddr *'s as 251 * parameters. 252 */ 253 /* ARGSUSED*/ 254 static void 255 if_init(void *dummy __unused) 256 { 257 258 IFNET_LOCK_INIT(); 259 TAILQ_INIT(&ifnet); 260 SLIST_INIT(&ifklist); 261 if_grow(); /* create initial table */ 262 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 263 UID_ROOT, GID_WHEEL, 0600, "network"); 264 } 265 266 static void 267 if_grow(void) 268 { 269 u_int n; 270 struct ifindex_entry *e; 271 272 if_indexlim <<= 1; 273 n = if_indexlim * sizeof(*e); 274 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 275 if (ifindex_table != NULL) { 276 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 277 free((caddr_t)ifindex_table, M_IFADDR); 278 } 279 ifindex_table = e; 280 } 281 282 /* ARGSUSED*/ 283 static void 284 if_check(void *dummy __unused) 285 { 286 struct ifnet *ifp; 287 int s; 288 289 s = splimp(); 290 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 291 TAILQ_FOREACH(ifp, &ifnet, if_link) { 292 if (ifp->if_snd.ifq_maxlen == 0) { 293 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 294 ifp->if_snd.ifq_maxlen = ifqmaxlen; 295 } 296 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 297 if_printf(ifp, 298 "XXX: driver didn't initialize queue mtx\n"); 299 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 300 MTX_NETWORK_LOCK, MTX_DEF); 301 } 302 } 303 IFNET_RUNLOCK(); 304 splx(s); 305 if_slowtimo(0); 306 } 307 308 static int 309 if_findindex(struct ifnet *ifp) 310 { 311 int i, unit; 312 char eaddr[18], devname[32]; 313 const char *name, *p; 314 315 switch (ifp->if_type) { 316 case IFT_ETHER: /* these types use struct arpcom */ 317 case IFT_FDDI: 318 case IFT_XETHER: 319 case IFT_ISO88025: 320 case IFT_L2VLAN: 321 snprintf(eaddr, 18, "%6D", 322 IFP2AC(ifp)->ac_enaddr, ":"); 323 break; 324 default: 325 eaddr[0] = '\0'; 326 break; 327 } 328 strlcpy(devname, ifp->if_xname, sizeof(devname)); 329 name = net_cdevsw.d_name; 330 i = 0; 331 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 332 if (resource_string_value(name, unit, "ether", &p) == 0) 333 if (strcmp(p, eaddr) == 0) 334 goto found; 335 if (resource_string_value(name, unit, "dev", &p) == 0) 336 if (strcmp(p, devname) == 0) 337 goto found; 338 } 339 unit = 0; 340 found: 341 if (unit != 0) { 342 if (ifaddr_byindex(unit) == NULL) 343 return (unit); 344 printf("%s%d in use, cannot hardwire it to %s.\n", 345 name, unit, devname); 346 } 347 for (unit = 1; ; unit++) { 348 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 349 continue; 350 if (resource_string_value(name, unit, "ether", &p) == 0 || 351 resource_string_value(name, unit, "dev", &p) == 0) 352 continue; 353 break; 354 } 355 return (unit); 356 } 357 358 /* 359 * Attach an interface to the 360 * list of "active" interfaces. 361 */ 362 void 363 if_attach(struct ifnet *ifp) 364 { 365 unsigned socksize, ifasize; 366 int namelen, masklen; 367 struct sockaddr_dl *sdl; 368 struct ifaddr *ifa; 369 370 IF_AFDATA_LOCK_INIT(ifp); 371 ifp->if_afdata_initialized = 0; 372 IFNET_WLOCK(); 373 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 374 IFNET_WUNLOCK(); 375 /* 376 * XXX - 377 * The old code would work if the interface passed a pre-existing 378 * chain of ifaddrs to this code. We don't trust our callers to 379 * properly initialize the tailq, however, so we no longer allow 380 * this unlikely case. 381 */ 382 TAILQ_INIT(&ifp->if_addrhead); 383 TAILQ_INIT(&ifp->if_prefixhead); 384 TAILQ_INIT(&ifp->if_multiaddrs); 385 SLIST_INIT(&ifp->if_klist); 386 getmicrotime(&ifp->if_lastchange); 387 388 #ifdef MAC 389 mac_init_ifnet(ifp); 390 mac_create_ifnet(ifp); 391 #endif 392 393 ifp->if_index = if_findindex(ifp); 394 if (ifp->if_index > if_index) 395 if_index = ifp->if_index; 396 if (if_index >= if_indexlim) 397 if_grow(); 398 399 ifnet_byindex(ifp->if_index) = ifp; 400 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 401 unit2minor(ifp->if_index), 402 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 403 net_cdevsw.d_name, ifp->if_xname); 404 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 405 net_cdevsw.d_name, ifp->if_index); 406 407 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 408 409 /* 410 * create a Link Level name for this device 411 */ 412 namelen = strlen(ifp->if_xname); 413 /* 414 * Always save enough space for any possiable name so we can do 415 * a rename in place later. 416 */ 417 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 418 socksize = masklen + ifp->if_addrlen; 419 if (socksize < sizeof(*sdl)) 420 socksize = sizeof(*sdl); 421 socksize = roundup2(socksize, sizeof(long)); 422 ifasize = sizeof(*ifa) + 2 * socksize; 423 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 424 IFA_LOCK_INIT(ifa); 425 sdl = (struct sockaddr_dl *)(ifa + 1); 426 sdl->sdl_len = socksize; 427 sdl->sdl_family = AF_LINK; 428 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 429 sdl->sdl_nlen = namelen; 430 sdl->sdl_index = ifp->if_index; 431 sdl->sdl_type = ifp->if_type; 432 ifaddr_byindex(ifp->if_index) = ifa; 433 ifa->ifa_ifp = ifp; 434 ifa->ifa_rtrequest = link_rtrequest; 435 ifa->ifa_addr = (struct sockaddr *)sdl; 436 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 437 ifa->ifa_netmask = (struct sockaddr *)sdl; 438 sdl->sdl_len = masklen; 439 while (namelen != 0) 440 sdl->sdl_data[--namelen] = 0xff; 441 ifa->ifa_refcnt = 1; 442 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 443 ifp->if_broadcastaddr = 0; /* reliably crash if used uninitialized */ 444 445 if (domains) 446 if_attachdomain1(ifp); 447 448 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 449 450 /* Announce the interface. */ 451 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 452 } 453 454 static void 455 if_attachdomain(void *dummy) 456 { 457 struct ifnet *ifp; 458 int s; 459 460 s = splnet(); 461 TAILQ_FOREACH(ifp, &ifnet, if_link) 462 if_attachdomain1(ifp); 463 splx(s); 464 } 465 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 466 if_attachdomain, NULL); 467 468 static void 469 if_attachdomain1(struct ifnet *ifp) 470 { 471 struct domain *dp; 472 int s; 473 474 s = splnet(); 475 476 /* 477 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 478 * cannot lock ifp->if_afdata initialization, entirely. 479 */ 480 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 481 splx(s); 482 return; 483 } 484 if (ifp->if_afdata_initialized) { 485 IF_AFDATA_UNLOCK(ifp); 486 splx(s); 487 return; 488 } 489 ifp->if_afdata_initialized = 1; 490 IF_AFDATA_UNLOCK(ifp); 491 492 /* address family dependent data region */ 493 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 494 for (dp = domains; dp; dp = dp->dom_next) { 495 if (dp->dom_ifattach) 496 ifp->if_afdata[dp->dom_family] = 497 (*dp->dom_ifattach)(ifp); 498 } 499 500 splx(s); 501 } 502 503 /* 504 * Detach an interface, removing it from the 505 * list of "active" interfaces. 506 */ 507 void 508 if_detach(struct ifnet *ifp) 509 { 510 struct ifaddr *ifa, *next; 511 struct radix_node_head *rnh; 512 int s; 513 int i; 514 struct domain *dp; 515 516 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 517 /* 518 * Remove routes and flush queues. 519 */ 520 s = splnet(); 521 if_down(ifp); 522 523 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) { 524 next = TAILQ_NEXT(ifa, ifa_link); 525 526 if (ifa->ifa_addr->sa_family == AF_LINK) 527 continue; 528 #ifdef INET 529 /* XXX: Ugly!! ad hoc just for INET */ 530 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 531 struct ifaliasreq ifr; 532 533 bzero(&ifr, sizeof(ifr)); 534 ifr.ifra_addr = *ifa->ifa_addr; 535 if (ifa->ifa_dstaddr) 536 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 537 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 538 NULL) == 0) 539 continue; 540 } 541 #endif /* INET */ 542 #ifdef INET6 543 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 544 in6_purgeaddr(ifa); 545 /* ifp_addrhead is already updated */ 546 continue; 547 } 548 #endif /* INET6 */ 549 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 550 IFAFREE(ifa); 551 } 552 553 #ifdef INET6 554 /* 555 * Remove all IPv6 kernel structs related to ifp. This should be done 556 * before removing routing entries below, since IPv6 interface direct 557 * routes are expected to be removed by the IPv6-specific kernel API. 558 * Otherwise, the kernel will detect some inconsistency and bark it. 559 */ 560 in6_ifdetach(ifp); 561 #endif 562 /* 563 * Remove address from ifindex_table[] and maybe decrement if_index. 564 * Clean up all addresses. 565 */ 566 ifaddr_byindex(ifp->if_index) = NULL; 567 destroy_dev(ifdev_byindex(ifp->if_index)); 568 ifdev_byindex(ifp->if_index) = NULL; 569 570 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 571 if_index--; 572 573 574 /* We can now free link ifaddr. */ 575 ifa = TAILQ_FIRST(&ifp->if_addrhead); 576 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 577 IFAFREE(ifa); 578 579 /* 580 * Delete all remaining routes using this interface 581 * Unfortuneatly the only way to do this is to slog through 582 * the entire routing table looking for routes which point 583 * to this interface...oh well... 584 */ 585 for (i = 1; i <= AF_MAX; i++) { 586 if ((rnh = rt_tables[i]) == NULL) 587 continue; 588 RADIX_NODE_HEAD_LOCK(rnh); 589 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 590 RADIX_NODE_HEAD_UNLOCK(rnh); 591 } 592 593 /* Announce that the interface is gone. */ 594 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 595 596 IF_AFDATA_LOCK(ifp); 597 for (dp = domains; dp; dp = dp->dom_next) { 598 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 599 (*dp->dom_ifdetach)(ifp, 600 ifp->if_afdata[dp->dom_family]); 601 } 602 IF_AFDATA_UNLOCK(ifp); 603 604 #ifdef MAC 605 mac_destroy_ifnet(ifp); 606 #endif /* MAC */ 607 KNOTE(&ifp->if_klist, NOTE_EXIT); 608 IFNET_WLOCK(); 609 TAILQ_REMOVE(&ifnet, ifp, if_link); 610 IFNET_WUNLOCK(); 611 mtx_destroy(&ifp->if_snd.ifq_mtx); 612 IF_AFDATA_DESTROY(ifp); 613 splx(s); 614 } 615 616 /* 617 * Delete Routes for a Network Interface 618 * 619 * Called for each routing entry via the rnh->rnh_walktree() call above 620 * to delete all route entries referencing a detaching network interface. 621 * 622 * Arguments: 623 * rn pointer to node in the routing table 624 * arg argument passed to rnh->rnh_walktree() - detaching interface 625 * 626 * Returns: 627 * 0 successful 628 * errno failed - reason indicated 629 * 630 */ 631 static int 632 if_rtdel(struct radix_node *rn, void *arg) 633 { 634 struct rtentry *rt = (struct rtentry *)rn; 635 struct ifnet *ifp = arg; 636 int err; 637 638 if (rt->rt_ifp == ifp) { 639 640 /* 641 * Protect (sorta) against walktree recursion problems 642 * with cloned routes 643 */ 644 if ((rt->rt_flags & RTF_UP) == 0) 645 return (0); 646 647 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 648 rt_mask(rt), rt->rt_flags, 649 (struct rtentry **) NULL); 650 if (err) { 651 log(LOG_WARNING, "if_rtdel: error %d\n", err); 652 } 653 } 654 655 return (0); 656 } 657 658 /* 659 * Create a clone network interface. 660 */ 661 int 662 if_clone_create(char *name, int len) 663 { 664 struct if_clone *ifc; 665 char *dp; 666 int wildcard, bytoff, bitoff; 667 int unit; 668 int err; 669 670 ifc = if_clone_lookup(name, &unit); 671 if (ifc == NULL) 672 return (EINVAL); 673 674 if (ifunit(name) != NULL) 675 return (EEXIST); 676 677 bytoff = bitoff = 0; 678 wildcard = (unit < 0); 679 /* 680 * Find a free unit if none was given. 681 */ 682 if (wildcard) { 683 while ((bytoff < ifc->ifc_bmlen) 684 && (ifc->ifc_units[bytoff] == 0xff)) 685 bytoff++; 686 if (bytoff >= ifc->ifc_bmlen) 687 return (ENOSPC); 688 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) 689 bitoff++; 690 unit = (bytoff << 3) + bitoff; 691 } 692 693 if (unit > ifc->ifc_maxunit) 694 return (ENXIO); 695 696 err = (*ifc->ifc_create)(ifc, unit); 697 if (err != 0) 698 return (err); 699 700 if (!wildcard) { 701 bytoff = unit >> 3; 702 bitoff = unit - (bytoff << 3); 703 } 704 705 /* 706 * Allocate the unit in the bitmap. 707 */ 708 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0, 709 ("%s: bit is already set", __func__)); 710 ifc->ifc_units[bytoff] |= (1 << bitoff); 711 712 /* In the wildcard case, we need to update the name. */ 713 if (wildcard) { 714 for (dp = name; *dp != '\0'; dp++); 715 if (snprintf(dp, len - (dp-name), "%d", unit) > 716 len - (dp-name) - 1) { 717 /* 718 * This can only be a programmer error and 719 * there's no straightforward way to recover if 720 * it happens. 721 */ 722 panic("if_clone_create(): interface name too long"); 723 } 724 725 } 726 727 return (0); 728 } 729 730 /* 731 * Destroy a clone network interface. 732 */ 733 int 734 if_clone_destroy(const char *name) 735 { 736 struct if_clone *ifc; 737 struct ifnet *ifp; 738 int bytoff, bitoff; 739 int unit; 740 741 ifp = ifunit(name); 742 if (ifp == NULL) 743 return (ENXIO); 744 745 unit = ifp->if_dunit; 746 747 ifc = if_clone_lookup(ifp->if_dname, NULL); 748 if (ifc == NULL) 749 return (EINVAL); 750 751 if (ifc->ifc_destroy == NULL) 752 return (EOPNOTSUPP); 753 754 (*ifc->ifc_destroy)(ifp); 755 756 /* 757 * Compute offset in the bitmap and deallocate the unit. 758 */ 759 bytoff = unit >> 3; 760 bitoff = unit - (bytoff << 3); 761 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0, 762 ("%s: bit is already cleared", __func__)); 763 ifc->ifc_units[bytoff] &= ~(1 << bitoff); 764 return (0); 765 } 766 767 /* 768 * Look up a network interface cloner. 769 */ 770 static struct if_clone * 771 if_clone_lookup(const char *name, int *unitp) 772 { 773 struct if_clone *ifc; 774 const char *cp; 775 int i; 776 777 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) { 778 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) { 779 if (ifc->ifc_name[i] != *cp) 780 goto next_ifc; 781 } 782 goto found_name; 783 next_ifc: 784 ifc = LIST_NEXT(ifc, ifc_list); 785 } 786 787 /* No match. */ 788 return ((struct if_clone *)NULL); 789 790 found_name: 791 if (*cp == '\0') { 792 i = -1; 793 } else { 794 for (i = 0; *cp != '\0'; cp++) { 795 if (*cp < '0' || *cp > '9') { 796 /* Bogus unit number. */ 797 return (NULL); 798 } 799 i = (i * 10) + (*cp - '0'); 800 } 801 } 802 803 if (unitp != NULL) 804 *unitp = i; 805 return (ifc); 806 } 807 808 /* 809 * Register a network interface cloner. 810 */ 811 void 812 if_clone_attach(struct if_clone *ifc) 813 { 814 int bytoff, bitoff; 815 int err; 816 int len, maxclone; 817 int unit; 818 819 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit, 820 ("%s: %s requested more units then allowed (%d > %d)", 821 __func__, ifc->ifc_name, ifc->ifc_minifs, 822 ifc->ifc_maxunit + 1)); 823 /* 824 * Compute bitmap size and allocate it. 825 */ 826 maxclone = ifc->ifc_maxunit + 1; 827 len = maxclone >> 3; 828 if ((len << 3) < maxclone) 829 len++; 830 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO); 831 ifc->ifc_bmlen = len; 832 833 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 834 if_cloners_count++; 835 836 for (unit = 0; unit < ifc->ifc_minifs; unit++) { 837 err = (*ifc->ifc_create)(ifc, unit); 838 KASSERT(err == 0, 839 ("%s: failed to create required interface %s%d", 840 __func__, ifc->ifc_name, unit)); 841 842 /* Allocate the unit in the bitmap. */ 843 bytoff = unit >> 3; 844 bitoff = unit - (bytoff << 3); 845 ifc->ifc_units[bytoff] |= (1 << bitoff); 846 } 847 EVENTHANDLER_INVOKE(if_clone_event, ifc); 848 } 849 850 /* 851 * Unregister a network interface cloner. 852 */ 853 void 854 if_clone_detach(struct if_clone *ifc) 855 { 856 857 LIST_REMOVE(ifc, ifc_list); 858 free(ifc->ifc_units, M_CLONE); 859 if_cloners_count--; 860 } 861 862 /* 863 * Provide list of interface cloners to userspace. 864 */ 865 static int 866 if_clone_list(struct if_clonereq *ifcr) 867 { 868 char outbuf[IFNAMSIZ], *dst; 869 struct if_clone *ifc; 870 int count, error = 0; 871 872 ifcr->ifcr_total = if_cloners_count; 873 if ((dst = ifcr->ifcr_buffer) == NULL) { 874 /* Just asking how many there are. */ 875 return (0); 876 } 877 878 if (ifcr->ifcr_count < 0) 879 return (EINVAL); 880 881 count = (if_cloners_count < ifcr->ifcr_count) ? 882 if_cloners_count : ifcr->ifcr_count; 883 884 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0; 885 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) { 886 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ); 887 error = copyout(outbuf, dst, IFNAMSIZ); 888 if (error) 889 break; 890 } 891 892 return (error); 893 } 894 895 #define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 896 897 /* 898 * Locate an interface based on a complete address. 899 */ 900 /*ARGSUSED*/ 901 struct ifaddr * 902 ifa_ifwithaddr(struct sockaddr *addr) 903 { 904 struct ifnet *ifp; 905 struct ifaddr *ifa; 906 907 IFNET_RLOCK(); 908 TAILQ_FOREACH(ifp, &ifnet, if_link) 909 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 910 if (ifa->ifa_addr->sa_family != addr->sa_family) 911 continue; 912 if (equal(addr, ifa->ifa_addr)) 913 goto done; 914 /* IP6 doesn't have broadcast */ 915 if ((ifp->if_flags & IFF_BROADCAST) && 916 ifa->ifa_broadaddr && 917 ifa->ifa_broadaddr->sa_len != 0 && 918 equal(ifa->ifa_broadaddr, addr)) 919 goto done; 920 } 921 ifa = NULL; 922 done: 923 IFNET_RUNLOCK(); 924 return (ifa); 925 } 926 927 /* 928 * Locate the point to point interface with a given destination address. 929 */ 930 /*ARGSUSED*/ 931 struct ifaddr * 932 ifa_ifwithdstaddr(struct sockaddr *addr) 933 { 934 struct ifnet *ifp; 935 struct ifaddr *ifa; 936 937 IFNET_RLOCK(); 938 TAILQ_FOREACH(ifp, &ifnet, if_link) { 939 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 940 continue; 941 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 942 if (ifa->ifa_addr->sa_family != addr->sa_family) 943 continue; 944 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 945 goto done; 946 } 947 } 948 ifa = NULL; 949 done: 950 IFNET_RUNLOCK(); 951 return (ifa); 952 } 953 954 /* 955 * Find an interface on a specific network. If many, choice 956 * is most specific found. 957 */ 958 struct ifaddr * 959 ifa_ifwithnet(struct sockaddr *addr) 960 { 961 struct ifnet *ifp; 962 struct ifaddr *ifa; 963 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 964 u_int af = addr->sa_family; 965 char *addr_data = addr->sa_data, *cplim; 966 967 /* 968 * AF_LINK addresses can be looked up directly by their index number, 969 * so do that if we can. 970 */ 971 if (af == AF_LINK) { 972 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 973 if (sdl->sdl_index && sdl->sdl_index <= if_index) 974 return (ifaddr_byindex(sdl->sdl_index)); 975 } 976 977 /* 978 * Scan though each interface, looking for ones that have 979 * addresses in this address family. 980 */ 981 IFNET_RLOCK(); 982 TAILQ_FOREACH(ifp, &ifnet, if_link) { 983 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 984 char *cp, *cp2, *cp3; 985 986 if (ifa->ifa_addr->sa_family != af) 987 next: continue; 988 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 989 /* 990 * This is a bit broken as it doesn't 991 * take into account that the remote end may 992 * be a single node in the network we are 993 * looking for. 994 * The trouble is that we don't know the 995 * netmask for the remote end. 996 */ 997 if (ifa->ifa_dstaddr != 0 998 && equal(addr, ifa->ifa_dstaddr)) 999 goto done; 1000 } else { 1001 /* 1002 * if we have a special address handler, 1003 * then use it instead of the generic one. 1004 */ 1005 if (ifa->ifa_claim_addr) { 1006 if ((*ifa->ifa_claim_addr)(ifa, addr)) 1007 goto done; 1008 continue; 1009 } 1010 1011 /* 1012 * Scan all the bits in the ifa's address. 1013 * If a bit dissagrees with what we are 1014 * looking for, mask it with the netmask 1015 * to see if it really matters. 1016 * (A byte at a time) 1017 */ 1018 if (ifa->ifa_netmask == 0) 1019 continue; 1020 cp = addr_data; 1021 cp2 = ifa->ifa_addr->sa_data; 1022 cp3 = ifa->ifa_netmask->sa_data; 1023 cplim = ifa->ifa_netmask->sa_len 1024 + (char *)ifa->ifa_netmask; 1025 while (cp3 < cplim) 1026 if ((*cp++ ^ *cp2++) & *cp3++) 1027 goto next; /* next address! */ 1028 /* 1029 * If the netmask of what we just found 1030 * is more specific than what we had before 1031 * (if we had one) then remember the new one 1032 * before continuing to search 1033 * for an even better one. 1034 */ 1035 if (ifa_maybe == 0 || 1036 rn_refines((caddr_t)ifa->ifa_netmask, 1037 (caddr_t)ifa_maybe->ifa_netmask)) 1038 ifa_maybe = ifa; 1039 } 1040 } 1041 } 1042 ifa = ifa_maybe; 1043 done: 1044 IFNET_RUNLOCK(); 1045 return (ifa); 1046 } 1047 1048 /* 1049 * Find an interface address specific to an interface best matching 1050 * a given address. 1051 */ 1052 struct ifaddr * 1053 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1054 { 1055 struct ifaddr *ifa; 1056 char *cp, *cp2, *cp3; 1057 char *cplim; 1058 struct ifaddr *ifa_maybe = 0; 1059 u_int af = addr->sa_family; 1060 1061 if (af >= AF_MAX) 1062 return (0); 1063 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1064 if (ifa->ifa_addr->sa_family != af) 1065 continue; 1066 if (ifa_maybe == 0) 1067 ifa_maybe = ifa; 1068 if (ifa->ifa_netmask == 0) { 1069 if (equal(addr, ifa->ifa_addr) || 1070 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 1071 goto done; 1072 continue; 1073 } 1074 if (ifp->if_flags & IFF_POINTOPOINT) { 1075 if (equal(addr, ifa->ifa_dstaddr)) 1076 goto done; 1077 } else { 1078 cp = addr->sa_data; 1079 cp2 = ifa->ifa_addr->sa_data; 1080 cp3 = ifa->ifa_netmask->sa_data; 1081 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1082 for (; cp3 < cplim; cp3++) 1083 if ((*cp++ ^ *cp2++) & *cp3) 1084 break; 1085 if (cp3 == cplim) 1086 goto done; 1087 } 1088 } 1089 ifa = ifa_maybe; 1090 done: 1091 return (ifa); 1092 } 1093 1094 #include <net/route.h> 1095 1096 /* 1097 * Default action when installing a route with a Link Level gateway. 1098 * Lookup an appropriate real ifa to point to. 1099 * This should be moved to /sys/net/link.c eventually. 1100 */ 1101 static void 1102 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1103 { 1104 struct ifaddr *ifa, *oifa; 1105 struct sockaddr *dst; 1106 struct ifnet *ifp; 1107 1108 RT_LOCK_ASSERT(rt); 1109 1110 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1111 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1112 return; 1113 ifa = ifaof_ifpforaddr(dst, ifp); 1114 if (ifa) { 1115 IFAREF(ifa); /* XXX */ 1116 oifa = rt->rt_ifa; 1117 rt->rt_ifa = ifa; 1118 IFAFREE(oifa); 1119 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1120 ifa->ifa_rtrequest(cmd, rt, info); 1121 } 1122 } 1123 1124 /* 1125 * Mark an interface down and notify protocols of 1126 * the transition. 1127 * NOTE: must be called at splnet or eqivalent. 1128 */ 1129 static void 1130 if_unroute(struct ifnet *ifp, int flag, int fam) 1131 { 1132 struct ifaddr *ifa; 1133 1134 ifp->if_flags &= ~flag; 1135 getmicrotime(&ifp->if_lastchange); 1136 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1137 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1138 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1139 if_qflush(&ifp->if_snd); 1140 rt_ifmsg(ifp); 1141 } 1142 1143 /* 1144 * Mark an interface up and notify protocols of 1145 * the transition. 1146 * NOTE: must be called at splnet or eqivalent. 1147 */ 1148 static void 1149 if_route(struct ifnet *ifp, int flag, int fam) 1150 { 1151 struct ifaddr *ifa; 1152 1153 ifp->if_flags |= flag; 1154 getmicrotime(&ifp->if_lastchange); 1155 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1156 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1157 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1158 rt_ifmsg(ifp); 1159 #ifdef INET6 1160 in6_if_up(ifp); 1161 #endif 1162 } 1163 1164 /* 1165 * Mark an interface down and notify protocols of 1166 * the transition. 1167 * NOTE: must be called at splnet or eqivalent. 1168 */ 1169 void 1170 if_down(struct ifnet *ifp) 1171 { 1172 1173 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1174 } 1175 1176 /* 1177 * Mark an interface up and notify protocols of 1178 * the transition. 1179 * NOTE: must be called at splnet or eqivalent. 1180 */ 1181 void 1182 if_up(struct ifnet *ifp) 1183 { 1184 1185 if_route(ifp, IFF_UP, AF_UNSPEC); 1186 } 1187 1188 /* 1189 * Flush an interface queue. 1190 */ 1191 static void 1192 if_qflush(struct ifqueue *ifq) 1193 { 1194 struct mbuf *m, *n; 1195 1196 n = ifq->ifq_head; 1197 while ((m = n) != 0) { 1198 n = m->m_act; 1199 m_freem(m); 1200 } 1201 ifq->ifq_head = 0; 1202 ifq->ifq_tail = 0; 1203 ifq->ifq_len = 0; 1204 } 1205 1206 /* 1207 * Handle interface watchdog timer routines. Called 1208 * from softclock, we decrement timers (if set) and 1209 * call the appropriate interface routine on expiration. 1210 */ 1211 static void 1212 if_slowtimo(void *arg) 1213 { 1214 struct ifnet *ifp; 1215 int s = splimp(); 1216 1217 IFNET_RLOCK(); 1218 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1219 if (ifp->if_timer == 0 || --ifp->if_timer) 1220 continue; 1221 if (ifp->if_watchdog) 1222 (*ifp->if_watchdog)(ifp); 1223 } 1224 IFNET_RUNLOCK(); 1225 splx(s); 1226 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1227 } 1228 1229 /* 1230 * Map interface name to 1231 * interface structure pointer. 1232 */ 1233 struct ifnet * 1234 ifunit(const char *name) 1235 { 1236 struct ifnet *ifp; 1237 1238 IFNET_RLOCK(); 1239 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1240 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1241 break; 1242 } 1243 IFNET_RUNLOCK(); 1244 return (ifp); 1245 } 1246 1247 /* 1248 * Hardware specific interface ioctls. 1249 */ 1250 static int 1251 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1252 { 1253 struct ifreq *ifr; 1254 struct ifstat *ifs; 1255 int error = 0; 1256 int new_flags; 1257 size_t namelen, onamelen; 1258 char new_name[IFNAMSIZ]; 1259 struct ifaddr *ifa; 1260 struct sockaddr_dl *sdl; 1261 1262 ifr = (struct ifreq *)data; 1263 switch (cmd) { 1264 case SIOCGIFINDEX: 1265 ifr->ifr_index = ifp->if_index; 1266 break; 1267 1268 case SIOCGIFFLAGS: 1269 ifr->ifr_flags = ifp->if_flags & 0xffff; 1270 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1271 break; 1272 1273 case SIOCGIFCAP: 1274 ifr->ifr_reqcap = ifp->if_capabilities; 1275 ifr->ifr_curcap = ifp->if_capenable; 1276 break; 1277 1278 #ifdef MAC 1279 case SIOCGIFMAC: 1280 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1281 break; 1282 #endif 1283 1284 case SIOCGIFMETRIC: 1285 ifr->ifr_metric = ifp->if_metric; 1286 break; 1287 1288 case SIOCGIFMTU: 1289 ifr->ifr_mtu = ifp->if_mtu; 1290 break; 1291 1292 case SIOCGIFPHYS: 1293 ifr->ifr_phys = ifp->if_physical; 1294 break; 1295 1296 case SIOCSIFFLAGS: 1297 error = suser(td); 1298 if (error) 1299 return (error); 1300 new_flags = (ifr->ifr_flags & 0xffff) | 1301 (ifr->ifr_flagshigh << 16); 1302 if (ifp->if_flags & IFF_SMART) { 1303 /* Smart drivers twiddle their own routes */ 1304 } else if (ifp->if_flags & IFF_UP && 1305 (new_flags & IFF_UP) == 0) { 1306 int s = splimp(); 1307 if_down(ifp); 1308 splx(s); 1309 } else if (new_flags & IFF_UP && 1310 (ifp->if_flags & IFF_UP) == 0) { 1311 int s = splimp(); 1312 if_up(ifp); 1313 splx(s); 1314 } 1315 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1316 (new_flags &~ IFF_CANTCHANGE); 1317 if (new_flags & IFF_PPROMISC) { 1318 /* Permanently promiscuous mode requested */ 1319 ifp->if_flags |= IFF_PROMISC; 1320 } else if (ifp->if_pcount == 0) { 1321 ifp->if_flags &= ~IFF_PROMISC; 1322 } 1323 if (ifp->if_ioctl) 1324 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1325 getmicrotime(&ifp->if_lastchange); 1326 break; 1327 1328 case SIOCSIFCAP: 1329 error = suser(td); 1330 if (error) 1331 return (error); 1332 if (ifp->if_ioctl == NULL) 1333 return (EOPNOTSUPP); 1334 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1335 return (EINVAL); 1336 error = (*ifp->if_ioctl)(ifp, cmd, data); 1337 if (error == 0) 1338 getmicrotime(&ifp->if_lastchange); 1339 break; 1340 1341 #ifdef MAC 1342 case SIOCSIFMAC: 1343 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1344 break; 1345 #endif 1346 1347 case SIOCSIFNAME: 1348 error = suser(td); 1349 if (error != 0) 1350 return (error); 1351 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1352 if (error != 0) 1353 return (error); 1354 if (new_name[0] == '\0') 1355 return (EINVAL); 1356 if (ifunit(new_name) != NULL) 1357 return (EEXIST); 1358 1359 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1360 /* Announce the departure of the interface. */ 1361 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1362 1363 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1364 ifa = ifaddr_byindex(ifp->if_index); 1365 IFA_LOCK(ifa); 1366 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1367 namelen = strlen(new_name); 1368 onamelen = sdl->sdl_nlen; 1369 /* 1370 * Move the address if needed. This is safe because we 1371 * allocate space for a name of length IFNAMSIZ when we 1372 * create this in if_attach(). 1373 */ 1374 if (namelen != onamelen) { 1375 bcopy(sdl->sdl_data + onamelen, 1376 sdl->sdl_data + namelen, sdl->sdl_alen); 1377 } 1378 bcopy(new_name, sdl->sdl_data, namelen); 1379 sdl->sdl_nlen = namelen; 1380 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1381 bzero(sdl->sdl_data, onamelen); 1382 while (namelen != 0) 1383 sdl->sdl_data[--namelen] = 0xff; 1384 IFA_UNLOCK(ifa); 1385 1386 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1387 /* Announce the return of the interface. */ 1388 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1389 break; 1390 1391 case SIOCSIFMETRIC: 1392 error = suser(td); 1393 if (error) 1394 return (error); 1395 ifp->if_metric = ifr->ifr_metric; 1396 getmicrotime(&ifp->if_lastchange); 1397 break; 1398 1399 case SIOCSIFPHYS: 1400 error = suser(td); 1401 if (error) 1402 return (error); 1403 if (ifp->if_ioctl == NULL) 1404 return (EOPNOTSUPP); 1405 error = (*ifp->if_ioctl)(ifp, cmd, data); 1406 if (error == 0) 1407 getmicrotime(&ifp->if_lastchange); 1408 break; 1409 1410 case SIOCSIFMTU: 1411 { 1412 u_long oldmtu = ifp->if_mtu; 1413 1414 error = suser(td); 1415 if (error) 1416 return (error); 1417 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1418 return (EINVAL); 1419 if (ifp->if_ioctl == NULL) 1420 return (EOPNOTSUPP); 1421 error = (*ifp->if_ioctl)(ifp, cmd, data); 1422 if (error == 0) { 1423 getmicrotime(&ifp->if_lastchange); 1424 rt_ifmsg(ifp); 1425 } 1426 /* 1427 * If the link MTU changed, do network layer specific procedure. 1428 */ 1429 if (ifp->if_mtu != oldmtu) { 1430 #ifdef INET6 1431 nd6_setmtu(ifp); 1432 #endif 1433 } 1434 break; 1435 } 1436 1437 case SIOCADDMULTI: 1438 case SIOCDELMULTI: 1439 error = suser(td); 1440 if (error) 1441 return (error); 1442 1443 /* Don't allow group membership on non-multicast interfaces. */ 1444 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1445 return (EOPNOTSUPP); 1446 1447 /* Don't let users screw up protocols' entries. */ 1448 if (ifr->ifr_addr.sa_family != AF_LINK) 1449 return (EINVAL); 1450 1451 if (cmd == SIOCADDMULTI) { 1452 struct ifmultiaddr *ifma; 1453 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1454 } else { 1455 error = if_delmulti(ifp, &ifr->ifr_addr); 1456 } 1457 if (error == 0) 1458 getmicrotime(&ifp->if_lastchange); 1459 break; 1460 1461 case SIOCSIFPHYADDR: 1462 case SIOCDIFPHYADDR: 1463 #ifdef INET6 1464 case SIOCSIFPHYADDR_IN6: 1465 #endif 1466 case SIOCSLIFPHYADDR: 1467 case SIOCSIFMEDIA: 1468 case SIOCSIFGENERIC: 1469 error = suser(td); 1470 if (error) 1471 return (error); 1472 if (ifp->if_ioctl == NULL) 1473 return (EOPNOTSUPP); 1474 error = (*ifp->if_ioctl)(ifp, cmd, data); 1475 if (error == 0) 1476 getmicrotime(&ifp->if_lastchange); 1477 break; 1478 1479 case SIOCGIFSTATUS: 1480 ifs = (struct ifstat *)data; 1481 ifs->ascii[0] = '\0'; 1482 1483 case SIOCGIFPSRCADDR: 1484 case SIOCGIFPDSTADDR: 1485 case SIOCGLIFPHYADDR: 1486 case SIOCGIFMEDIA: 1487 case SIOCGIFGENERIC: 1488 if (ifp->if_ioctl == NULL) 1489 return (EOPNOTSUPP); 1490 error = (*ifp->if_ioctl)(ifp, cmd, data); 1491 break; 1492 1493 case SIOCSIFLLADDR: 1494 error = suser(td); 1495 if (error) 1496 return (error); 1497 error = if_setlladdr(ifp, 1498 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1499 break; 1500 1501 default: 1502 error = ENOIOCTL; 1503 break; 1504 } 1505 return (error); 1506 } 1507 1508 /* 1509 * Interface ioctls. 1510 */ 1511 int 1512 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1513 { 1514 struct ifnet *ifp; 1515 struct ifreq *ifr; 1516 int error; 1517 int oif_flags; 1518 1519 switch (cmd) { 1520 case SIOCGIFCONF: 1521 case OSIOCGIFCONF: 1522 return (ifconf(cmd, data)); 1523 } 1524 ifr = (struct ifreq *)data; 1525 1526 switch (cmd) { 1527 case SIOCIFCREATE: 1528 case SIOCIFDESTROY: 1529 if ((error = suser(td)) != 0) 1530 return (error); 1531 return ((cmd == SIOCIFCREATE) ? 1532 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1533 if_clone_destroy(ifr->ifr_name)); 1534 1535 case SIOCIFGCLONERS: 1536 return (if_clone_list((struct if_clonereq *)data)); 1537 } 1538 1539 ifp = ifunit(ifr->ifr_name); 1540 if (ifp == 0) 1541 return (ENXIO); 1542 1543 error = ifhwioctl(cmd, ifp, data, td); 1544 if (error != ENOIOCTL) 1545 return (error); 1546 1547 oif_flags = ifp->if_flags; 1548 if (so->so_proto == 0) 1549 return (EOPNOTSUPP); 1550 #ifndef COMPAT_43 1551 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1552 data, 1553 ifp, td)); 1554 #else 1555 { 1556 int ocmd = cmd; 1557 1558 switch (cmd) { 1559 1560 case SIOCSIFDSTADDR: 1561 case SIOCSIFADDR: 1562 case SIOCSIFBRDADDR: 1563 case SIOCSIFNETMASK: 1564 #if BYTE_ORDER != BIG_ENDIAN 1565 if (ifr->ifr_addr.sa_family == 0 && 1566 ifr->ifr_addr.sa_len < 16) { 1567 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1568 ifr->ifr_addr.sa_len = 16; 1569 } 1570 #else 1571 if (ifr->ifr_addr.sa_len == 0) 1572 ifr->ifr_addr.sa_len = 16; 1573 #endif 1574 break; 1575 1576 case OSIOCGIFADDR: 1577 cmd = SIOCGIFADDR; 1578 break; 1579 1580 case OSIOCGIFDSTADDR: 1581 cmd = SIOCGIFDSTADDR; 1582 break; 1583 1584 case OSIOCGIFBRDADDR: 1585 cmd = SIOCGIFBRDADDR; 1586 break; 1587 1588 case OSIOCGIFNETMASK: 1589 cmd = SIOCGIFNETMASK; 1590 } 1591 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1592 cmd, 1593 data, 1594 ifp, td)); 1595 switch (ocmd) { 1596 1597 case OSIOCGIFADDR: 1598 case OSIOCGIFDSTADDR: 1599 case OSIOCGIFBRDADDR: 1600 case OSIOCGIFNETMASK: 1601 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1602 1603 } 1604 } 1605 #endif /* COMPAT_43 */ 1606 1607 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1608 #ifdef INET6 1609 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1610 if (ifp->if_flags & IFF_UP) { 1611 int s = splimp(); 1612 in6_if_up(ifp); 1613 splx(s); 1614 } 1615 #endif 1616 } 1617 return (error); 1618 } 1619 1620 /* 1621 * Set/clear promiscuous mode on interface ifp based on the truth value 1622 * of pswitch. The calls are reference counted so that only the first 1623 * "on" request actually has an effect, as does the final "off" request. 1624 * Results are undefined if the "off" and "on" requests are not matched. 1625 */ 1626 int 1627 ifpromisc(struct ifnet *ifp, int pswitch) 1628 { 1629 struct ifreq ifr; 1630 int error; 1631 int oldflags, oldpcount; 1632 1633 oldpcount = ifp->if_pcount; 1634 oldflags = ifp->if_flags; 1635 if (ifp->if_flags & IFF_PPROMISC) { 1636 /* Do nothing if device is in permanently promiscuous mode */ 1637 ifp->if_pcount += pswitch ? 1 : -1; 1638 return (0); 1639 } 1640 if (pswitch) { 1641 /* 1642 * If the device is not configured up, we cannot put it in 1643 * promiscuous mode. 1644 */ 1645 if ((ifp->if_flags & IFF_UP) == 0) 1646 return (ENETDOWN); 1647 if (ifp->if_pcount++ != 0) 1648 return (0); 1649 ifp->if_flags |= IFF_PROMISC; 1650 } else { 1651 if (--ifp->if_pcount > 0) 1652 return (0); 1653 ifp->if_flags &= ~IFF_PROMISC; 1654 } 1655 ifr.ifr_flags = ifp->if_flags & 0xffff; 1656 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1657 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1658 if (error == 0) { 1659 log(LOG_INFO, "%s: promiscuous mode %s\n", 1660 ifp->if_xname, 1661 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1662 rt_ifmsg(ifp); 1663 } else { 1664 ifp->if_pcount = oldpcount; 1665 ifp->if_flags = oldflags; 1666 } 1667 return error; 1668 } 1669 1670 /* 1671 * Return interface configuration 1672 * of system. List may be used 1673 * in later ioctl's (above) to get 1674 * other information. 1675 */ 1676 /*ARGSUSED*/ 1677 static int 1678 ifconf(u_long cmd, caddr_t data) 1679 { 1680 struct ifconf *ifc = (struct ifconf *)data; 1681 struct ifnet *ifp; 1682 struct ifaddr *ifa; 1683 struct ifreq ifr, *ifrp; 1684 int space = ifc->ifc_len, error = 0; 1685 1686 ifrp = ifc->ifc_req; 1687 IFNET_RLOCK(); /* could sleep XXX */ 1688 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1689 int addrs; 1690 1691 if (space < sizeof(ifr)) 1692 break; 1693 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1694 >= sizeof(ifr.ifr_name)) { 1695 error = ENAMETOOLONG; 1696 break; 1697 } 1698 1699 addrs = 0; 1700 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1701 struct sockaddr *sa = ifa->ifa_addr; 1702 1703 if (space < sizeof(ifr)) 1704 break; 1705 if (jailed(curthread->td_ucred) && 1706 prison_if(curthread->td_ucred, sa)) 1707 continue; 1708 addrs++; 1709 #ifdef COMPAT_43 1710 if (cmd == OSIOCGIFCONF) { 1711 struct osockaddr *osa = 1712 (struct osockaddr *)&ifr.ifr_addr; 1713 ifr.ifr_addr = *sa; 1714 osa->sa_family = sa->sa_family; 1715 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1716 sizeof (ifr)); 1717 ifrp++; 1718 } else 1719 #endif 1720 if (sa->sa_len <= sizeof(*sa)) { 1721 ifr.ifr_addr = *sa; 1722 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1723 sizeof (ifr)); 1724 ifrp++; 1725 } else { 1726 if (space < sizeof (ifr) + sa->sa_len - 1727 sizeof(*sa)) 1728 break; 1729 space -= sa->sa_len - sizeof(*sa); 1730 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1731 sizeof (ifr.ifr_name)); 1732 if (error == 0) 1733 error = copyout((caddr_t)sa, 1734 (caddr_t)&ifrp->ifr_addr, sa->sa_len); 1735 ifrp = (struct ifreq *) 1736 (sa->sa_len + (caddr_t)&ifrp->ifr_addr); 1737 } 1738 if (error) 1739 break; 1740 space -= sizeof (ifr); 1741 } 1742 if (error) 1743 break; 1744 if (!addrs) { 1745 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1746 error = copyout((caddr_t)&ifr, (caddr_t)ifrp, 1747 sizeof (ifr)); 1748 if (error) 1749 break; 1750 space -= sizeof (ifr); 1751 ifrp++; 1752 } 1753 } 1754 IFNET_RUNLOCK(); 1755 ifc->ifc_len -= space; 1756 return (error); 1757 } 1758 1759 /* 1760 * Just like if_promisc(), but for all-multicast-reception mode. 1761 */ 1762 int 1763 if_allmulti(struct ifnet *ifp, int onswitch) 1764 { 1765 int error = 0; 1766 int s = splimp(); 1767 struct ifreq ifr; 1768 1769 if (onswitch) { 1770 if (ifp->if_amcount++ == 0) { 1771 ifp->if_flags |= IFF_ALLMULTI; 1772 ifr.ifr_flags = ifp->if_flags & 0xffff; 1773 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1774 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1775 } 1776 } else { 1777 if (ifp->if_amcount > 1) { 1778 ifp->if_amcount--; 1779 } else { 1780 ifp->if_amcount = 0; 1781 ifp->if_flags &= ~IFF_ALLMULTI; 1782 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1783 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1784 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1785 } 1786 } 1787 splx(s); 1788 1789 if (error == 0) 1790 rt_ifmsg(ifp); 1791 return error; 1792 } 1793 1794 /* 1795 * Add a multicast listenership to the interface in question. 1796 * The link layer provides a routine which converts 1797 */ 1798 int 1799 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1800 { 1801 struct sockaddr *llsa, *dupsa; 1802 int error, s; 1803 struct ifmultiaddr *ifma; 1804 1805 /* 1806 * If the matching multicast address already exists 1807 * then don't add a new one, just add a reference 1808 */ 1809 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1810 if (equal(sa, ifma->ifma_addr)) { 1811 ifma->ifma_refcount++; 1812 if (retifma) 1813 *retifma = ifma; 1814 return 0; 1815 } 1816 } 1817 1818 /* 1819 * Give the link layer a chance to accept/reject it, and also 1820 * find out which AF_LINK address this maps to, if it isn't one 1821 * already. 1822 */ 1823 if (ifp->if_resolvemulti) { 1824 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1825 if (error) return error; 1826 } else { 1827 llsa = 0; 1828 } 1829 1830 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1831 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1832 bcopy(sa, dupsa, sa->sa_len); 1833 1834 ifma->ifma_addr = dupsa; 1835 ifma->ifma_lladdr = llsa; 1836 ifma->ifma_ifp = ifp; 1837 ifma->ifma_refcount = 1; 1838 ifma->ifma_protospec = 0; 1839 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1840 1841 /* 1842 * Some network interfaces can scan the address list at 1843 * interrupt time; lock them out. 1844 */ 1845 s = splimp(); 1846 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1847 splx(s); 1848 if (retifma != NULL) 1849 *retifma = ifma; 1850 1851 if (llsa != 0) { 1852 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1853 if (equal(ifma->ifma_addr, llsa)) 1854 break; 1855 } 1856 if (ifma) { 1857 ifma->ifma_refcount++; 1858 } else { 1859 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1860 M_IFMADDR, M_WAITOK); 1861 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1862 M_IFMADDR, M_WAITOK); 1863 bcopy(llsa, dupsa, llsa->sa_len); 1864 ifma->ifma_addr = dupsa; 1865 ifma->ifma_lladdr = NULL; 1866 ifma->ifma_ifp = ifp; 1867 ifma->ifma_refcount = 1; 1868 ifma->ifma_protospec = 0; 1869 s = splimp(); 1870 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1871 splx(s); 1872 } 1873 } 1874 /* 1875 * We are certain we have added something, so call down to the 1876 * interface to let them know about it. 1877 */ 1878 s = splimp(); 1879 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1880 splx(s); 1881 1882 return 0; 1883 } 1884 1885 /* 1886 * Remove a reference to a multicast address on this interface. Yell 1887 * if the request does not match an existing membership. 1888 */ 1889 int 1890 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1891 { 1892 struct ifmultiaddr *ifma; 1893 int s; 1894 1895 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1896 if (equal(sa, ifma->ifma_addr)) 1897 break; 1898 if (ifma == 0) 1899 return ENOENT; 1900 1901 if (ifma->ifma_refcount > 1) { 1902 ifma->ifma_refcount--; 1903 return 0; 1904 } 1905 1906 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1907 sa = ifma->ifma_lladdr; 1908 s = splimp(); 1909 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1910 /* 1911 * Make sure the interface driver is notified 1912 * in the case of a link layer mcast group being left. 1913 */ 1914 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) 1915 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1916 splx(s); 1917 free(ifma->ifma_addr, M_IFMADDR); 1918 free(ifma, M_IFMADDR); 1919 if (sa == 0) 1920 return 0; 1921 1922 /* 1923 * Now look for the link-layer address which corresponds to 1924 * this network address. It had been squirreled away in 1925 * ifma->ifma_lladdr for this purpose (so we don't have 1926 * to call ifp->if_resolvemulti() again), and we saved that 1927 * value in sa above. If some nasty deleted the 1928 * link-layer address out from underneath us, we can deal because 1929 * the address we stored was is not the same as the one which was 1930 * in the record for the link-layer address. (So we don't complain 1931 * in that case.) 1932 */ 1933 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1934 if (equal(sa, ifma->ifma_addr)) 1935 break; 1936 if (ifma == 0) 1937 return 0; 1938 1939 if (ifma->ifma_refcount > 1) { 1940 ifma->ifma_refcount--; 1941 return 0; 1942 } 1943 1944 s = splimp(); 1945 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1946 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1947 splx(s); 1948 free(ifma->ifma_addr, M_IFMADDR); 1949 free(sa, M_IFMADDR); 1950 free(ifma, M_IFMADDR); 1951 1952 return 0; 1953 } 1954 1955 /* 1956 * Set the link layer address on an interface. 1957 * 1958 * At this time we only support certain types of interfaces, 1959 * and we don't allow the length of the address to change. 1960 */ 1961 int 1962 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1963 { 1964 struct sockaddr_dl *sdl; 1965 struct ifaddr *ifa; 1966 struct ifreq ifr; 1967 1968 ifa = ifaddr_byindex(ifp->if_index); 1969 if (ifa == NULL) 1970 return (EINVAL); 1971 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1972 if (sdl == NULL) 1973 return (EINVAL); 1974 if (len != sdl->sdl_alen) /* don't allow length to change */ 1975 return (EINVAL); 1976 switch (ifp->if_type) { 1977 case IFT_ETHER: /* these types use struct arpcom */ 1978 case IFT_FDDI: 1979 case IFT_XETHER: 1980 case IFT_ISO88025: 1981 case IFT_L2VLAN: 1982 bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len); 1983 /* 1984 * XXX We also need to store the lladdr in LLADDR(sdl), 1985 * which is done below. This is a pain because we must 1986 * remember to keep the info in sync. 1987 */ 1988 /* FALLTHROUGH */ 1989 case IFT_ARCNET: 1990 bcopy(lladdr, LLADDR(sdl), len); 1991 break; 1992 default: 1993 return (ENODEV); 1994 } 1995 /* 1996 * If the interface is already up, we need 1997 * to re-init it in order to reprogram its 1998 * address filter. 1999 */ 2000 if ((ifp->if_flags & IFF_UP) != 0) { 2001 ifp->if_flags &= ~IFF_UP; 2002 ifr.ifr_flags = ifp->if_flags & 0xffff; 2003 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2004 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2005 ifp->if_flags |= IFF_UP; 2006 ifr.ifr_flags = ifp->if_flags & 0xffff; 2007 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2008 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2009 #ifdef INET 2010 /* 2011 * Also send gratuitous ARPs to notify other nodes about 2012 * the address change. 2013 */ 2014 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2015 if (ifa->ifa_addr != NULL && 2016 ifa->ifa_addr->sa_family == AF_INET) 2017 arp_ifinit(ifp, ifa); 2018 } 2019 #endif 2020 } 2021 return (0); 2022 } 2023 2024 struct ifmultiaddr * 2025 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 2026 { 2027 struct ifmultiaddr *ifma; 2028 2029 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 2030 if (equal(ifma->ifma_addr, sa)) 2031 break; 2032 2033 return ifma; 2034 } 2035 2036 /* 2037 * The name argument must be a pointer to storage which will last as 2038 * long as the interface does. For physical devices, the result of 2039 * device_get_name(dev) is a good choice and for pseudo-devices a 2040 * static string works well. 2041 */ 2042 void 2043 if_initname(struct ifnet *ifp, const char *name, int unit) 2044 { 2045 ifp->if_dname = name; 2046 ifp->if_dunit = unit; 2047 if (unit != IF_DUNIT_NONE) 2048 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 2049 else 2050 strlcpy(ifp->if_xname, name, IFNAMSIZ); 2051 } 2052 2053 int 2054 if_printf(struct ifnet *ifp, const char * fmt, ...) 2055 { 2056 va_list ap; 2057 int retval; 2058 2059 retval = printf("%s: ", ifp->if_xname); 2060 va_start(ap, fmt); 2061 retval += vprintf(fmt, ap); 2062 va_end(ap); 2063 return (retval); 2064 } 2065 2066 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 2067 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 2068