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 #include "opt_carp.h" 38 39 #include <sys/param.h> 40 #include <sys/types.h> 41 #include <sys/conf.h> 42 #include <sys/mac.h> 43 #include <sys/malloc.h> 44 #include <sys/sbuf.h> 45 #include <sys/bus.h> 46 #include <sys/mbuf.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/protosw.h> 52 #include <sys/kernel.h> 53 #include <sys/sockio.h> 54 #include <sys/syslog.h> 55 #include <sys/sysctl.h> 56 #include <sys/taskqueue.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_clone.h> 64 #include <net/if_dl.h> 65 #include <net/if_types.h> 66 #include <net/if_var.h> 67 #include <net/radix.h> 68 #include <net/route.h> 69 70 #if defined(INET) || defined(INET6) 71 /*XXX*/ 72 #include <netinet/in.h> 73 #include <netinet/in_var.h> 74 #ifdef INET6 75 #include <netinet6/in6_var.h> 76 #include <netinet6/in6_ifattach.h> 77 #endif 78 #endif 79 #ifdef INET 80 #include <netinet/if_ether.h> 81 #endif 82 #ifdef DEV_CARP 83 #include <netinet/ip_carp.h> 84 #endif 85 86 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 87 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 88 89 /* Log link state change events */ 90 static int log_link_state_change = 1; 91 92 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 93 &log_link_state_change, 0, 94 "log interface link state change events"); 95 96 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 97 98 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 99 100 static void if_attachdomain(void *); 101 static void if_attachdomain1(struct ifnet *); 102 static int ifconf(u_long, caddr_t); 103 static void if_grow(void); 104 static void if_init(void *); 105 static void if_check(void *); 106 static int if_findindex(struct ifnet *); 107 static void if_qflush(struct ifaltq *); 108 static void if_route(struct ifnet *, int flag, int fam); 109 static void if_slowtimo(void *); 110 static void if_unroute(struct ifnet *, int flag, int fam); 111 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 112 static int if_rtdel(struct radix_node *, void *); 113 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 114 static void if_start_deferred(void *context, int pending); 115 #ifdef INET6 116 /* 117 * XXX: declare here to avoid to include many inet6 related files.. 118 * should be more generalized? 119 */ 120 extern void nd6_setmtu(struct ifnet *); 121 #endif 122 123 int if_index = 0; 124 struct ifindex_entry *ifindex_table = NULL; 125 int ifqmaxlen = IFQ_MAXLEN; 126 struct ifnethead ifnet; /* depend on static init XXX */ 127 struct mtx ifnet_lock; 128 129 static int if_indexlim = 8; 130 static struct knlist ifklist; 131 132 static void filt_netdetach(struct knote *kn); 133 static int filt_netdev(struct knote *kn, long hint); 134 135 static struct filterops netdev_filtops = 136 { 1, NULL, filt_netdetach, filt_netdev }; 137 138 /* 139 * System initialization 140 */ 141 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL) 142 SYSINIT(interface_check, SI_SUB_PROTO_IF, SI_ORDER_FIRST, if_check, NULL) 143 144 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 145 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 146 147 static d_open_t netopen; 148 static d_close_t netclose; 149 static d_ioctl_t netioctl; 150 static d_kqfilter_t netkqfilter; 151 152 static struct cdevsw net_cdevsw = { 153 .d_version = D_VERSION, 154 .d_flags = D_NEEDGIANT, 155 .d_open = netopen, 156 .d_close = netclose, 157 .d_ioctl = netioctl, 158 .d_name = "net", 159 .d_kqfilter = netkqfilter, 160 }; 161 162 static int 163 netopen(struct cdev *dev, int flag, int mode, struct thread *td) 164 { 165 return (0); 166 } 167 168 static int 169 netclose(struct cdev *dev, int flags, int fmt, struct thread *td) 170 { 171 return (0); 172 } 173 174 static int 175 netioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 176 { 177 struct ifnet *ifp; 178 int error, idx; 179 180 /* only support interface specific ioctls */ 181 if (IOCGROUP(cmd) != 'i') 182 return (EOPNOTSUPP); 183 idx = minor(dev); 184 if (idx == 0) { 185 /* 186 * special network device, not interface. 187 */ 188 if (cmd == SIOCGIFCONF) 189 return (ifconf(cmd, data)); /* XXX remove cmd */ 190 return (EOPNOTSUPP); 191 } 192 193 ifp = ifnet_byindex(idx); 194 if (ifp == NULL) 195 return (ENXIO); 196 197 error = ifhwioctl(cmd, ifp, data, td); 198 if (error == ENOIOCTL) 199 error = EOPNOTSUPP; 200 return (error); 201 } 202 203 static int 204 netkqfilter(struct cdev *dev, struct knote *kn) 205 { 206 struct knlist *klist; 207 struct ifnet *ifp; 208 int idx; 209 210 switch (kn->kn_filter) { 211 case EVFILT_NETDEV: 212 kn->kn_fop = &netdev_filtops; 213 break; 214 default: 215 return (1); 216 } 217 218 idx = minor(dev); 219 if (idx == 0) { 220 klist = &ifklist; 221 } else { 222 ifp = ifnet_byindex(idx); 223 if (ifp == NULL) 224 return (1); 225 klist = &ifp->if_klist; 226 } 227 228 kn->kn_hook = (caddr_t)klist; 229 230 knlist_add(klist, kn, 0); 231 232 return (0); 233 } 234 235 static void 236 filt_netdetach(struct knote *kn) 237 { 238 struct knlist *klist = (struct knlist *)kn->kn_hook; 239 240 knlist_remove(klist, kn, 0); 241 } 242 243 static int 244 filt_netdev(struct knote *kn, long hint) 245 { 246 struct knlist *klist = (struct knlist *)kn->kn_hook; 247 248 /* 249 * Currently NOTE_EXIT is abused to indicate device detach. 250 */ 251 if (hint == NOTE_EXIT) { 252 kn->kn_data = NOTE_LINKINV; 253 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 254 knlist_remove_inevent(klist, kn); 255 return (1); 256 } 257 if (hint != 0) 258 kn->kn_data = hint; /* current status */ 259 if (kn->kn_sfflags & hint) 260 kn->kn_fflags |= hint; 261 return (kn->kn_fflags != 0); 262 } 263 264 /* 265 * Network interface utility routines. 266 * 267 * Routines with ifa_ifwith* names take sockaddr *'s as 268 * parameters. 269 */ 270 /* ARGSUSED*/ 271 static void 272 if_init(void *dummy __unused) 273 { 274 275 IFNET_LOCK_INIT(); 276 TAILQ_INIT(&ifnet); 277 knlist_init(&ifklist, NULL); 278 if_grow(); /* create initial table */ 279 ifdev_byindex(0) = make_dev(&net_cdevsw, 0, 280 UID_ROOT, GID_WHEEL, 0600, "network"); 281 if_clone_init(); 282 } 283 284 static void 285 if_grow(void) 286 { 287 u_int n; 288 struct ifindex_entry *e; 289 290 if_indexlim <<= 1; 291 n = if_indexlim * sizeof(*e); 292 e = malloc(n, M_IFADDR, M_WAITOK | M_ZERO); 293 if (ifindex_table != NULL) { 294 memcpy((caddr_t)e, (caddr_t)ifindex_table, n/2); 295 free((caddr_t)ifindex_table, M_IFADDR); 296 } 297 ifindex_table = e; 298 } 299 300 /* ARGSUSED*/ 301 static void 302 if_check(void *dummy __unused) 303 { 304 struct ifnet *ifp; 305 int s; 306 307 s = splimp(); 308 IFNET_RLOCK(); /* could sleep on rare error; mostly okay XXX */ 309 TAILQ_FOREACH(ifp, &ifnet, if_link) { 310 if (ifp->if_snd.ifq_maxlen == 0) { 311 if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n"); 312 ifp->if_snd.ifq_maxlen = ifqmaxlen; 313 } 314 if (!mtx_initialized(&ifp->if_snd.ifq_mtx)) { 315 if_printf(ifp, 316 "XXX: driver didn't initialize queue mtx\n"); 317 mtx_init(&ifp->if_snd.ifq_mtx, "unknown", 318 MTX_NETWORK_LOCK, MTX_DEF); 319 } 320 } 321 IFNET_RUNLOCK(); 322 splx(s); 323 if_slowtimo(0); 324 } 325 326 static int 327 if_findindex(struct ifnet *ifp) 328 { 329 int i, unit; 330 char eaddr[18], devname[32]; 331 const char *name, *p; 332 333 switch (ifp->if_type) { 334 case IFT_ETHER: /* these types use struct arpcom */ 335 case IFT_FDDI: 336 case IFT_XETHER: 337 case IFT_ISO88025: 338 case IFT_L2VLAN: 339 snprintf(eaddr, 18, "%6D", IFP2AC(ifp)->ac_enaddr, ":"); 340 break; 341 default: 342 eaddr[0] = '\0'; 343 break; 344 } 345 strlcpy(devname, ifp->if_xname, sizeof(devname)); 346 name = net_cdevsw.d_name; 347 i = 0; 348 while ((resource_find_dev(&i, name, &unit, NULL, NULL)) == 0) { 349 if (resource_string_value(name, unit, "ether", &p) == 0) 350 if (strcmp(p, eaddr) == 0) 351 goto found; 352 if (resource_string_value(name, unit, "dev", &p) == 0) 353 if (strcmp(p, devname) == 0) 354 goto found; 355 } 356 unit = 0; 357 found: 358 if (unit != 0) { 359 if (ifaddr_byindex(unit) == NULL) 360 return (unit); 361 printf("%s%d in use, cannot hardwire it to %s.\n", 362 name, unit, devname); 363 } 364 for (unit = 1; ; unit++) { 365 if (unit <= if_index && ifaddr_byindex(unit) != NULL) 366 continue; 367 if (resource_string_value(name, unit, "ether", &p) == 0 || 368 resource_string_value(name, unit, "dev", &p) == 0) 369 continue; 370 break; 371 } 372 return (unit); 373 } 374 375 /* 376 * Attach an interface to the 377 * list of "active" interfaces. 378 */ 379 void 380 if_attach(struct ifnet *ifp) 381 { 382 unsigned socksize, ifasize; 383 int namelen, masklen; 384 struct sockaddr_dl *sdl; 385 struct ifaddr *ifa; 386 387 TASK_INIT(&ifp->if_starttask, 0, if_start_deferred, ifp); 388 IF_AFDATA_LOCK_INIT(ifp); 389 ifp->if_afdata_initialized = 0; 390 IFNET_WLOCK(); 391 TAILQ_INSERT_TAIL(&ifnet, ifp, if_link); 392 IFNET_WUNLOCK(); 393 /* 394 * XXX - 395 * The old code would work if the interface passed a pre-existing 396 * chain of ifaddrs to this code. We don't trust our callers to 397 * properly initialize the tailq, however, so we no longer allow 398 * this unlikely case. 399 */ 400 TAILQ_INIT(&ifp->if_addrhead); 401 TAILQ_INIT(&ifp->if_prefixhead); 402 TAILQ_INIT(&ifp->if_multiaddrs); 403 knlist_init(&ifp->if_klist, NULL); 404 getmicrotime(&ifp->if_lastchange); 405 ifp->if_data.ifi_epoch = time_uptime; 406 407 #ifdef MAC 408 mac_init_ifnet(ifp); 409 mac_create_ifnet(ifp); 410 #endif 411 412 ifp->if_index = if_findindex(ifp); 413 if (ifp->if_index > if_index) 414 if_index = ifp->if_index; 415 if (if_index >= if_indexlim) 416 if_grow(); 417 ifp->if_data.ifi_datalen = sizeof(struct if_data); 418 419 ifnet_byindex(ifp->if_index) = ifp; 420 ifdev_byindex(ifp->if_index) = make_dev(&net_cdevsw, 421 unit2minor(ifp->if_index), 422 UID_ROOT, GID_WHEEL, 0600, "%s/%s", 423 net_cdevsw.d_name, ifp->if_xname); 424 make_dev_alias(ifdev_byindex(ifp->if_index), "%s%d", 425 net_cdevsw.d_name, ifp->if_index); 426 427 mtx_init(&ifp->if_snd.ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 428 429 /* 430 * create a Link Level name for this device 431 */ 432 namelen = strlen(ifp->if_xname); 433 /* 434 * Always save enough space for any possiable name so we can do 435 * a rename in place later. 436 */ 437 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 438 socksize = masklen + ifp->if_addrlen; 439 if (socksize < sizeof(*sdl)) 440 socksize = sizeof(*sdl); 441 socksize = roundup2(socksize, sizeof(long)); 442 ifasize = sizeof(*ifa) + 2 * socksize; 443 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 444 IFA_LOCK_INIT(ifa); 445 sdl = (struct sockaddr_dl *)(ifa + 1); 446 sdl->sdl_len = socksize; 447 sdl->sdl_family = AF_LINK; 448 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 449 sdl->sdl_nlen = namelen; 450 sdl->sdl_index = ifp->if_index; 451 sdl->sdl_type = ifp->if_type; 452 ifaddr_byindex(ifp->if_index) = ifa; 453 ifa->ifa_ifp = ifp; 454 ifa->ifa_rtrequest = link_rtrequest; 455 ifa->ifa_addr = (struct sockaddr *)sdl; 456 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 457 ifa->ifa_netmask = (struct sockaddr *)sdl; 458 sdl->sdl_len = masklen; 459 while (namelen != 0) 460 sdl->sdl_data[--namelen] = 0xff; 461 ifa->ifa_refcnt = 1; 462 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 463 ifp->if_broadcastaddr = NULL; /* reliably crash if used uninitialized */ 464 ifp->if_snd.altq_type = 0; 465 ifp->if_snd.altq_disc = NULL; 466 ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE; 467 ifp->if_snd.altq_tbr = NULL; 468 ifp->if_snd.altq_ifp = ifp; 469 470 if (domain_init_status >= 2) 471 if_attachdomain1(ifp); 472 473 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 474 475 /* Announce the interface. */ 476 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 477 } 478 479 static void 480 if_attachdomain(void *dummy) 481 { 482 struct ifnet *ifp; 483 int s; 484 485 s = splnet(); 486 TAILQ_FOREACH(ifp, &ifnet, if_link) 487 if_attachdomain1(ifp); 488 splx(s); 489 } 490 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 491 if_attachdomain, NULL); 492 493 static void 494 if_attachdomain1(struct ifnet *ifp) 495 { 496 struct domain *dp; 497 int s; 498 499 s = splnet(); 500 501 /* 502 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 503 * cannot lock ifp->if_afdata initialization, entirely. 504 */ 505 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 506 splx(s); 507 return; 508 } 509 if (ifp->if_afdata_initialized >= domain_init_status) { 510 IF_AFDATA_UNLOCK(ifp); 511 splx(s); 512 printf("if_attachdomain called more than once on %s\n", 513 ifp->if_xname); 514 return; 515 } 516 ifp->if_afdata_initialized = domain_init_status; 517 IF_AFDATA_UNLOCK(ifp); 518 519 /* address family dependent data region */ 520 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 521 for (dp = domains; dp; dp = dp->dom_next) { 522 if (dp->dom_ifattach) 523 ifp->if_afdata[dp->dom_family] = 524 (*dp->dom_ifattach)(ifp); 525 } 526 527 splx(s); 528 } 529 530 /* 531 * Detach an interface, removing it from the 532 * list of "active" interfaces. 533 */ 534 void 535 if_detach(struct ifnet *ifp) 536 { 537 struct ifaddr *ifa, *next; 538 struct radix_node_head *rnh; 539 int s; 540 int i; 541 struct domain *dp; 542 struct ifnet *iter; 543 int found; 544 545 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 546 #ifdef DEV_CARP 547 /* Maybe hook to the generalized departure handler above?!? */ 548 if (ifp->if_carp) 549 carp_ifdetach(ifp); 550 #endif 551 552 /* 553 * Remove routes and flush queues. 554 */ 555 s = splnet(); 556 if_down(ifp); 557 #ifdef ALTQ 558 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 559 altq_disable(&ifp->if_snd); 560 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 561 altq_detach(&ifp->if_snd); 562 #endif 563 564 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; ifa = next) { 565 next = TAILQ_NEXT(ifa, ifa_link); 566 567 if (ifa->ifa_addr->sa_family == AF_LINK) 568 continue; 569 #ifdef INET 570 /* XXX: Ugly!! ad hoc just for INET */ 571 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 572 struct ifaliasreq ifr; 573 574 bzero(&ifr, sizeof(ifr)); 575 ifr.ifra_addr = *ifa->ifa_addr; 576 if (ifa->ifa_dstaddr) 577 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 578 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 579 NULL) == 0) 580 continue; 581 } 582 #endif /* INET */ 583 #ifdef INET6 584 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) { 585 in6_purgeaddr(ifa); 586 /* ifp_addrhead is already updated */ 587 continue; 588 } 589 #endif /* INET6 */ 590 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 591 IFAFREE(ifa); 592 } 593 594 #ifdef INET6 595 /* 596 * Remove all IPv6 kernel structs related to ifp. This should be done 597 * before removing routing entries below, since IPv6 interface direct 598 * routes are expected to be removed by the IPv6-specific kernel API. 599 * Otherwise, the kernel will detect some inconsistency and bark it. 600 */ 601 in6_ifdetach(ifp); 602 #endif 603 /* 604 * Remove address from ifindex_table[] and maybe decrement if_index. 605 * Clean up all addresses. 606 */ 607 ifnet_byindex(ifp->if_index) = NULL; 608 ifaddr_byindex(ifp->if_index) = NULL; 609 destroy_dev(ifdev_byindex(ifp->if_index)); 610 ifdev_byindex(ifp->if_index) = NULL; 611 612 while (if_index > 0 && ifaddr_byindex(if_index) == NULL) 613 if_index--; 614 615 616 /* We can now free link ifaddr. */ 617 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 618 ifa = TAILQ_FIRST(&ifp->if_addrhead); 619 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 620 IFAFREE(ifa); 621 } 622 623 /* 624 * Delete all remaining routes using this interface 625 * Unfortuneatly the only way to do this is to slog through 626 * the entire routing table looking for routes which point 627 * to this interface...oh well... 628 */ 629 for (i = 1; i <= AF_MAX; i++) { 630 if ((rnh = rt_tables[i]) == NULL) 631 continue; 632 RADIX_NODE_HEAD_LOCK(rnh); 633 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 634 RADIX_NODE_HEAD_UNLOCK(rnh); 635 } 636 637 /* Announce that the interface is gone. */ 638 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 639 640 IF_AFDATA_LOCK(ifp); 641 for (dp = domains; dp; dp = dp->dom_next) { 642 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 643 (*dp->dom_ifdetach)(ifp, 644 ifp->if_afdata[dp->dom_family]); 645 } 646 IF_AFDATA_UNLOCK(ifp); 647 648 #ifdef MAC 649 mac_destroy_ifnet(ifp); 650 #endif /* MAC */ 651 KNOTE_UNLOCKED(&ifp->if_klist, NOTE_EXIT); 652 knlist_clear(&ifp->if_klist, 0); 653 knlist_destroy(&ifp->if_klist); 654 IFNET_WLOCK(); 655 found = 0; 656 TAILQ_FOREACH(iter, &ifnet, if_link) 657 if (iter == ifp) { 658 found = 1; 659 break; 660 } 661 if (found) 662 TAILQ_REMOVE(&ifnet, ifp, if_link); 663 IFNET_WUNLOCK(); 664 mtx_destroy(&ifp->if_snd.ifq_mtx); 665 IF_AFDATA_DESTROY(ifp); 666 splx(s); 667 } 668 669 /* 670 * Delete Routes for a Network Interface 671 * 672 * Called for each routing entry via the rnh->rnh_walktree() call above 673 * to delete all route entries referencing a detaching network interface. 674 * 675 * Arguments: 676 * rn pointer to node in the routing table 677 * arg argument passed to rnh->rnh_walktree() - detaching interface 678 * 679 * Returns: 680 * 0 successful 681 * errno failed - reason indicated 682 * 683 */ 684 static int 685 if_rtdel(struct radix_node *rn, void *arg) 686 { 687 struct rtentry *rt = (struct rtentry *)rn; 688 struct ifnet *ifp = arg; 689 int err; 690 691 if (rt->rt_ifp == ifp) { 692 693 /* 694 * Protect (sorta) against walktree recursion problems 695 * with cloned routes 696 */ 697 if ((rt->rt_flags & RTF_UP) == 0) 698 return (0); 699 700 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 701 rt_mask(rt), rt->rt_flags, 702 (struct rtentry **) NULL); 703 if (err) { 704 log(LOG_WARNING, "if_rtdel: error %d\n", err); 705 } 706 } 707 708 return (0); 709 } 710 711 #define equal(a1, a2) (bcmp((a1), (a2), ((a1))->sa_len) == 0) 712 713 /* 714 * Locate an interface based on a complete address. 715 */ 716 /*ARGSUSED*/ 717 struct ifaddr * 718 ifa_ifwithaddr(struct sockaddr *addr) 719 { 720 struct ifnet *ifp; 721 struct ifaddr *ifa; 722 723 IFNET_RLOCK(); 724 TAILQ_FOREACH(ifp, &ifnet, if_link) 725 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 726 if (ifa->ifa_addr->sa_family != addr->sa_family) 727 continue; 728 if (equal(addr, ifa->ifa_addr)) 729 goto done; 730 /* IP6 doesn't have broadcast */ 731 if ((ifp->if_flags & IFF_BROADCAST) && 732 ifa->ifa_broadaddr && 733 ifa->ifa_broadaddr->sa_len != 0 && 734 equal(ifa->ifa_broadaddr, addr)) 735 goto done; 736 } 737 ifa = NULL; 738 done: 739 IFNET_RUNLOCK(); 740 return (ifa); 741 } 742 743 /* 744 * Locate the point to point interface with a given destination address. 745 */ 746 /*ARGSUSED*/ 747 struct ifaddr * 748 ifa_ifwithdstaddr(struct sockaddr *addr) 749 { 750 struct ifnet *ifp; 751 struct ifaddr *ifa; 752 753 IFNET_RLOCK(); 754 TAILQ_FOREACH(ifp, &ifnet, if_link) { 755 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 756 continue; 757 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 758 if (ifa->ifa_addr->sa_family != addr->sa_family) 759 continue; 760 if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) 761 goto done; 762 } 763 } 764 ifa = NULL; 765 done: 766 IFNET_RUNLOCK(); 767 return (ifa); 768 } 769 770 /* 771 * Find an interface on a specific network. If many, choice 772 * is most specific found. 773 */ 774 struct ifaddr * 775 ifa_ifwithnet(struct sockaddr *addr) 776 { 777 struct ifnet *ifp; 778 struct ifaddr *ifa; 779 struct ifaddr *ifa_maybe = (struct ifaddr *) 0; 780 u_int af = addr->sa_family; 781 char *addr_data = addr->sa_data, *cplim; 782 783 /* 784 * AF_LINK addresses can be looked up directly by their index number, 785 * so do that if we can. 786 */ 787 if (af == AF_LINK) { 788 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 789 if (sdl->sdl_index && sdl->sdl_index <= if_index) 790 return (ifaddr_byindex(sdl->sdl_index)); 791 } 792 793 /* 794 * Scan though each interface, looking for ones that have 795 * addresses in this address family. 796 */ 797 IFNET_RLOCK(); 798 TAILQ_FOREACH(ifp, &ifnet, if_link) { 799 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 800 char *cp, *cp2, *cp3; 801 802 if (ifa->ifa_addr->sa_family != af) 803 next: continue; 804 if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) { 805 /* 806 * This is a bit broken as it doesn't 807 * take into account that the remote end may 808 * be a single node in the network we are 809 * looking for. 810 * The trouble is that we don't know the 811 * netmask for the remote end. 812 */ 813 if (ifa->ifa_dstaddr != 0 814 && equal(addr, ifa->ifa_dstaddr)) 815 goto done; 816 } else { 817 /* 818 * if we have a special address handler, 819 * then use it instead of the generic one. 820 */ 821 if (ifa->ifa_claim_addr) { 822 if ((*ifa->ifa_claim_addr)(ifa, addr)) 823 goto done; 824 continue; 825 } 826 827 /* 828 * Scan all the bits in the ifa's address. 829 * If a bit dissagrees with what we are 830 * looking for, mask it with the netmask 831 * to see if it really matters. 832 * (A byte at a time) 833 */ 834 if (ifa->ifa_netmask == 0) 835 continue; 836 cp = addr_data; 837 cp2 = ifa->ifa_addr->sa_data; 838 cp3 = ifa->ifa_netmask->sa_data; 839 cplim = ifa->ifa_netmask->sa_len 840 + (char *)ifa->ifa_netmask; 841 while (cp3 < cplim) 842 if ((*cp++ ^ *cp2++) & *cp3++) 843 goto next; /* next address! */ 844 /* 845 * If the netmask of what we just found 846 * is more specific than what we had before 847 * (if we had one) then remember the new one 848 * before continuing to search 849 * for an even better one. 850 */ 851 if (ifa_maybe == 0 || 852 rn_refines((caddr_t)ifa->ifa_netmask, 853 (caddr_t)ifa_maybe->ifa_netmask)) 854 ifa_maybe = ifa; 855 } 856 } 857 } 858 ifa = ifa_maybe; 859 done: 860 IFNET_RUNLOCK(); 861 return (ifa); 862 } 863 864 /* 865 * Find an interface address specific to an interface best matching 866 * a given address. 867 */ 868 struct ifaddr * 869 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 870 { 871 struct ifaddr *ifa; 872 char *cp, *cp2, *cp3; 873 char *cplim; 874 struct ifaddr *ifa_maybe = 0; 875 u_int af = addr->sa_family; 876 877 if (af >= AF_MAX) 878 return (0); 879 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 880 if (ifa->ifa_addr->sa_family != af) 881 continue; 882 if (ifa_maybe == 0) 883 ifa_maybe = ifa; 884 if (ifa->ifa_netmask == 0) { 885 if (equal(addr, ifa->ifa_addr) || 886 (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))) 887 goto done; 888 continue; 889 } 890 if (ifp->if_flags & IFF_POINTOPOINT) { 891 if (equal(addr, ifa->ifa_dstaddr)) 892 goto done; 893 } else { 894 cp = addr->sa_data; 895 cp2 = ifa->ifa_addr->sa_data; 896 cp3 = ifa->ifa_netmask->sa_data; 897 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 898 for (; cp3 < cplim; cp3++) 899 if ((*cp++ ^ *cp2++) & *cp3) 900 break; 901 if (cp3 == cplim) 902 goto done; 903 } 904 } 905 ifa = ifa_maybe; 906 done: 907 return (ifa); 908 } 909 910 #include <net/route.h> 911 912 /* 913 * Default action when installing a route with a Link Level gateway. 914 * Lookup an appropriate real ifa to point to. 915 * This should be moved to /sys/net/link.c eventually. 916 */ 917 static void 918 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 919 { 920 struct ifaddr *ifa, *oifa; 921 struct sockaddr *dst; 922 struct ifnet *ifp; 923 924 RT_LOCK_ASSERT(rt); 925 926 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 927 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 928 return; 929 ifa = ifaof_ifpforaddr(dst, ifp); 930 if (ifa) { 931 IFAREF(ifa); /* XXX */ 932 oifa = rt->rt_ifa; 933 rt->rt_ifa = ifa; 934 IFAFREE(oifa); 935 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 936 ifa->ifa_rtrequest(cmd, rt, info); 937 } 938 } 939 940 /* 941 * Mark an interface down and notify protocols of 942 * the transition. 943 * NOTE: must be called at splnet or eqivalent. 944 */ 945 static void 946 if_unroute(struct ifnet *ifp, int flag, int fam) 947 { 948 struct ifaddr *ifa; 949 950 ifp->if_flags &= ~flag; 951 getmicrotime(&ifp->if_lastchange); 952 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 953 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 954 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 955 if_qflush(&ifp->if_snd); 956 #ifdef DEV_CARP 957 if (ifp->if_carp) 958 carp_carpdev_state(ifp->if_carp); 959 #endif 960 rt_ifmsg(ifp); 961 } 962 963 /* 964 * Mark an interface up and notify protocols of 965 * the transition. 966 * NOTE: must be called at splnet or eqivalent. 967 */ 968 static void 969 if_route(struct ifnet *ifp, int flag, int fam) 970 { 971 struct ifaddr *ifa; 972 973 ifp->if_flags |= flag; 974 getmicrotime(&ifp->if_lastchange); 975 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 976 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 977 pfctlinput(PRC_IFUP, ifa->ifa_addr); 978 #ifdef DEV_CARP 979 if (ifp->if_carp) 980 carp_carpdev_state(ifp->if_carp); 981 #endif 982 rt_ifmsg(ifp); 983 #ifdef INET6 984 in6_if_up(ifp); 985 #endif 986 } 987 988 void (*vlan_link_state_p)(struct ifnet *, int); /* XXX: private from if_vlan */ 989 990 /* 991 * Handle a change in the interface link state. 992 */ 993 void 994 if_link_state_change(struct ifnet *ifp, int link_state) 995 { 996 int link; 997 998 /* Return if state hasn't changed. */ 999 if (ifp->if_link_state == link_state) 1000 return; 1001 1002 ifp->if_link_state = link_state; 1003 1004 /* Notify that the link state has changed. */ 1005 rt_ifmsg(ifp); 1006 if (link_state == LINK_STATE_UP) 1007 link = NOTE_LINKUP; 1008 else if (link_state == LINK_STATE_DOWN) 1009 link = NOTE_LINKDOWN; 1010 else 1011 link = NOTE_LINKINV; 1012 KNOTE_UNLOCKED(&ifp->if_klist, link); 1013 if (ifp->if_nvlans != 0) 1014 (*vlan_link_state_p)(ifp, link); 1015 1016 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1017 IFP2AC(ifp)->ac_netgraph != NULL) 1018 (*ng_ether_link_state_p)(ifp, link_state); 1019 #ifdef DEV_CARP 1020 if (ifp->if_carp) 1021 carp_carpdev_state(ifp->if_carp); 1022 #endif 1023 if (log_link_state_change) 1024 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1025 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1026 } 1027 1028 /* 1029 * Mark an interface down and notify protocols of 1030 * the transition. 1031 * NOTE: must be called at splnet or eqivalent. 1032 */ 1033 void 1034 if_down(struct ifnet *ifp) 1035 { 1036 1037 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1038 } 1039 1040 /* 1041 * Mark an interface up and notify protocols of 1042 * the transition. 1043 * NOTE: must be called at splnet or eqivalent. 1044 */ 1045 void 1046 if_up(struct ifnet *ifp) 1047 { 1048 1049 if_route(ifp, IFF_UP, AF_UNSPEC); 1050 } 1051 1052 /* 1053 * Flush an interface queue. 1054 */ 1055 static void 1056 if_qflush(struct ifaltq *ifq) 1057 { 1058 struct mbuf *m, *n; 1059 1060 IFQ_LOCK(ifq); 1061 #ifdef ALTQ 1062 if (ALTQ_IS_ENABLED(ifq)) 1063 ALTQ_PURGE(ifq); 1064 #endif 1065 n = ifq->ifq_head; 1066 while ((m = n) != 0) { 1067 n = m->m_act; 1068 m_freem(m); 1069 } 1070 ifq->ifq_head = 0; 1071 ifq->ifq_tail = 0; 1072 ifq->ifq_len = 0; 1073 IFQ_UNLOCK(ifq); 1074 } 1075 1076 /* 1077 * Handle interface watchdog timer routines. Called 1078 * from softclock, we decrement timers (if set) and 1079 * call the appropriate interface routine on expiration. 1080 * 1081 * XXXRW: Note that because timeouts run with Giant, if_watchdog() is called 1082 * holding Giant. If we switch to an MPSAFE callout, we likely need to grab 1083 * Giant before entering if_watchdog() on an IFF_NEEDSGIANT interface. 1084 */ 1085 static void 1086 if_slowtimo(void *arg) 1087 { 1088 struct ifnet *ifp; 1089 int s = splimp(); 1090 1091 IFNET_RLOCK(); 1092 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1093 if (ifp->if_timer == 0 || --ifp->if_timer) 1094 continue; 1095 if (ifp->if_watchdog) 1096 (*ifp->if_watchdog)(ifp); 1097 } 1098 IFNET_RUNLOCK(); 1099 splx(s); 1100 timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ); 1101 } 1102 1103 /* 1104 * Map interface name to 1105 * interface structure pointer. 1106 */ 1107 struct ifnet * 1108 ifunit(const char *name) 1109 { 1110 struct ifnet *ifp; 1111 1112 IFNET_RLOCK(); 1113 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1114 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1115 break; 1116 } 1117 IFNET_RUNLOCK(); 1118 return (ifp); 1119 } 1120 1121 /* 1122 * Hardware specific interface ioctls. 1123 */ 1124 static int 1125 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 1126 { 1127 struct ifreq *ifr; 1128 struct ifstat *ifs; 1129 int error = 0; 1130 int new_flags; 1131 size_t namelen, onamelen; 1132 char new_name[IFNAMSIZ]; 1133 struct ifaddr *ifa; 1134 struct sockaddr_dl *sdl; 1135 1136 ifr = (struct ifreq *)data; 1137 switch (cmd) { 1138 case SIOCGIFINDEX: 1139 ifr->ifr_index = ifp->if_index; 1140 break; 1141 1142 case SIOCGIFFLAGS: 1143 ifr->ifr_flags = ifp->if_flags & 0xffff; 1144 ifr->ifr_flagshigh = ifp->if_flags >> 16; 1145 break; 1146 1147 case SIOCGIFCAP: 1148 ifr->ifr_reqcap = ifp->if_capabilities; 1149 ifr->ifr_curcap = ifp->if_capenable; 1150 break; 1151 1152 #ifdef MAC 1153 case SIOCGIFMAC: 1154 error = mac_ioctl_ifnet_get(td->td_ucred, ifr, ifp); 1155 break; 1156 #endif 1157 1158 case SIOCGIFMETRIC: 1159 ifr->ifr_metric = ifp->if_metric; 1160 break; 1161 1162 case SIOCGIFMTU: 1163 ifr->ifr_mtu = ifp->if_mtu; 1164 break; 1165 1166 case SIOCGIFPHYS: 1167 ifr->ifr_phys = ifp->if_physical; 1168 break; 1169 1170 case SIOCSIFFLAGS: 1171 error = suser(td); 1172 if (error) 1173 return (error); 1174 new_flags = (ifr->ifr_flags & 0xffff) | 1175 (ifr->ifr_flagshigh << 16); 1176 if (ifp->if_flags & IFF_SMART) { 1177 /* Smart drivers twiddle their own routes */ 1178 } else if (ifp->if_flags & IFF_UP && 1179 (new_flags & IFF_UP) == 0) { 1180 int s = splimp(); 1181 if_down(ifp); 1182 splx(s); 1183 } else if (new_flags & IFF_UP && 1184 (ifp->if_flags & IFF_UP) == 0) { 1185 int s = splimp(); 1186 if_up(ifp); 1187 splx(s); 1188 } 1189 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 1190 (new_flags &~ IFF_CANTCHANGE); 1191 if (new_flags & IFF_PPROMISC) { 1192 /* Permanently promiscuous mode requested */ 1193 ifp->if_flags |= IFF_PROMISC; 1194 } else if (ifp->if_pcount == 0) { 1195 ifp->if_flags &= ~IFF_PROMISC; 1196 } 1197 if (ifp->if_ioctl) { 1198 IFF_LOCKGIANT(ifp); 1199 (void) (*ifp->if_ioctl)(ifp, cmd, data); 1200 IFF_UNLOCKGIANT(ifp); 1201 } 1202 getmicrotime(&ifp->if_lastchange); 1203 break; 1204 1205 case SIOCSIFCAP: 1206 error = suser(td); 1207 if (error) 1208 return (error); 1209 if (ifp->if_ioctl == NULL) 1210 return (EOPNOTSUPP); 1211 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 1212 return (EINVAL); 1213 IFF_LOCKGIANT(ifp); 1214 error = (*ifp->if_ioctl)(ifp, cmd, data); 1215 IFF_UNLOCKGIANT(ifp); 1216 if (error == 0) 1217 getmicrotime(&ifp->if_lastchange); 1218 break; 1219 1220 #ifdef MAC 1221 case SIOCSIFMAC: 1222 error = mac_ioctl_ifnet_set(td->td_ucred, ifr, ifp); 1223 break; 1224 #endif 1225 1226 case SIOCSIFNAME: 1227 error = suser(td); 1228 if (error != 0) 1229 return (error); 1230 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 1231 if (error != 0) 1232 return (error); 1233 if (new_name[0] == '\0') 1234 return (EINVAL); 1235 if (ifunit(new_name) != NULL) 1236 return (EEXIST); 1237 1238 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 1239 /* Announce the departure of the interface. */ 1240 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 1241 1242 log(LOG_INFO, "%s: changing name to '%s'\n", 1243 ifp->if_xname, new_name); 1244 1245 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 1246 ifa = ifaddr_byindex(ifp->if_index); 1247 IFA_LOCK(ifa); 1248 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1249 namelen = strlen(new_name); 1250 onamelen = sdl->sdl_nlen; 1251 /* 1252 * Move the address if needed. This is safe because we 1253 * allocate space for a name of length IFNAMSIZ when we 1254 * create this in if_attach(). 1255 */ 1256 if (namelen != onamelen) { 1257 bcopy(sdl->sdl_data + onamelen, 1258 sdl->sdl_data + namelen, sdl->sdl_alen); 1259 } 1260 bcopy(new_name, sdl->sdl_data, namelen); 1261 sdl->sdl_nlen = namelen; 1262 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 1263 bzero(sdl->sdl_data, onamelen); 1264 while (namelen != 0) 1265 sdl->sdl_data[--namelen] = 0xff; 1266 IFA_UNLOCK(ifa); 1267 1268 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 1269 /* Announce the return of the interface. */ 1270 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 1271 break; 1272 1273 case SIOCSIFMETRIC: 1274 error = suser(td); 1275 if (error) 1276 return (error); 1277 ifp->if_metric = ifr->ifr_metric; 1278 getmicrotime(&ifp->if_lastchange); 1279 break; 1280 1281 case SIOCSIFPHYS: 1282 error = suser(td); 1283 if (error) 1284 return (error); 1285 if (ifp->if_ioctl == NULL) 1286 return (EOPNOTSUPP); 1287 IFF_LOCKGIANT(ifp); 1288 error = (*ifp->if_ioctl)(ifp, cmd, data); 1289 IFF_UNLOCKGIANT(ifp); 1290 if (error == 0) 1291 getmicrotime(&ifp->if_lastchange); 1292 break; 1293 1294 case SIOCSIFMTU: 1295 { 1296 u_long oldmtu = ifp->if_mtu; 1297 1298 error = suser(td); 1299 if (error) 1300 return (error); 1301 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 1302 return (EINVAL); 1303 if (ifp->if_ioctl == NULL) 1304 return (EOPNOTSUPP); 1305 IFF_LOCKGIANT(ifp); 1306 error = (*ifp->if_ioctl)(ifp, cmd, data); 1307 IFF_UNLOCKGIANT(ifp); 1308 if (error == 0) { 1309 getmicrotime(&ifp->if_lastchange); 1310 rt_ifmsg(ifp); 1311 } 1312 /* 1313 * If the link MTU changed, do network layer specific procedure. 1314 */ 1315 if (ifp->if_mtu != oldmtu) { 1316 #ifdef INET6 1317 nd6_setmtu(ifp); 1318 #endif 1319 } 1320 break; 1321 } 1322 1323 case SIOCADDMULTI: 1324 case SIOCDELMULTI: 1325 error = suser(td); 1326 if (error) 1327 return (error); 1328 1329 /* Don't allow group membership on non-multicast interfaces. */ 1330 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1331 return (EOPNOTSUPP); 1332 1333 /* Don't let users screw up protocols' entries. */ 1334 if (ifr->ifr_addr.sa_family != AF_LINK) 1335 return (EINVAL); 1336 1337 if (cmd == SIOCADDMULTI) { 1338 struct ifmultiaddr *ifma; 1339 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 1340 } else { 1341 error = if_delmulti(ifp, &ifr->ifr_addr); 1342 } 1343 if (error == 0) 1344 getmicrotime(&ifp->if_lastchange); 1345 break; 1346 1347 case SIOCSIFPHYADDR: 1348 case SIOCDIFPHYADDR: 1349 #ifdef INET6 1350 case SIOCSIFPHYADDR_IN6: 1351 #endif 1352 case SIOCSLIFPHYADDR: 1353 case SIOCSIFMEDIA: 1354 case SIOCSIFGENERIC: 1355 error = suser(td); 1356 if (error) 1357 return (error); 1358 if (ifp->if_ioctl == NULL) 1359 return (EOPNOTSUPP); 1360 IFF_LOCKGIANT(ifp); 1361 error = (*ifp->if_ioctl)(ifp, cmd, data); 1362 IFF_UNLOCKGIANT(ifp); 1363 if (error == 0) 1364 getmicrotime(&ifp->if_lastchange); 1365 break; 1366 1367 case SIOCGIFSTATUS: 1368 ifs = (struct ifstat *)data; 1369 ifs->ascii[0] = '\0'; 1370 1371 case SIOCGIFPSRCADDR: 1372 case SIOCGIFPDSTADDR: 1373 case SIOCGLIFPHYADDR: 1374 case SIOCGIFMEDIA: 1375 case SIOCGIFGENERIC: 1376 if (ifp->if_ioctl == NULL) 1377 return (EOPNOTSUPP); 1378 IFF_LOCKGIANT(ifp); 1379 error = (*ifp->if_ioctl)(ifp, cmd, data); 1380 IFF_UNLOCKGIANT(ifp); 1381 break; 1382 1383 case SIOCSIFLLADDR: 1384 error = suser(td); 1385 if (error) 1386 return (error); 1387 error = if_setlladdr(ifp, 1388 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 1389 break; 1390 1391 default: 1392 error = ENOIOCTL; 1393 break; 1394 } 1395 return (error); 1396 } 1397 1398 /* 1399 * Interface ioctls. 1400 */ 1401 int 1402 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 1403 { 1404 struct ifnet *ifp; 1405 struct ifreq *ifr; 1406 int error; 1407 int oif_flags; 1408 1409 switch (cmd) { 1410 case SIOCGIFCONF: 1411 case OSIOCGIFCONF: 1412 return (ifconf(cmd, data)); 1413 } 1414 ifr = (struct ifreq *)data; 1415 1416 switch (cmd) { 1417 case SIOCIFCREATE: 1418 case SIOCIFDESTROY: 1419 if ((error = suser(td)) != 0) 1420 return (error); 1421 return ((cmd == SIOCIFCREATE) ? 1422 if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) : 1423 if_clone_destroy(ifr->ifr_name)); 1424 1425 case SIOCIFGCLONERS: 1426 return (if_clone_list((struct if_clonereq *)data)); 1427 } 1428 1429 ifp = ifunit(ifr->ifr_name); 1430 if (ifp == 0) 1431 return (ENXIO); 1432 1433 error = ifhwioctl(cmd, ifp, data, td); 1434 if (error != ENOIOCTL) 1435 return (error); 1436 1437 oif_flags = ifp->if_flags; 1438 if (so->so_proto == 0) 1439 return (EOPNOTSUPP); 1440 #ifndef COMPAT_43 1441 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 1442 data, 1443 ifp, td)); 1444 #else 1445 { 1446 int ocmd = cmd; 1447 1448 switch (cmd) { 1449 1450 case SIOCSIFDSTADDR: 1451 case SIOCSIFADDR: 1452 case SIOCSIFBRDADDR: 1453 case SIOCSIFNETMASK: 1454 #if BYTE_ORDER != BIG_ENDIAN 1455 if (ifr->ifr_addr.sa_family == 0 && 1456 ifr->ifr_addr.sa_len < 16) { 1457 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 1458 ifr->ifr_addr.sa_len = 16; 1459 } 1460 #else 1461 if (ifr->ifr_addr.sa_len == 0) 1462 ifr->ifr_addr.sa_len = 16; 1463 #endif 1464 break; 1465 1466 case OSIOCGIFADDR: 1467 cmd = SIOCGIFADDR; 1468 break; 1469 1470 case OSIOCGIFDSTADDR: 1471 cmd = SIOCGIFDSTADDR; 1472 break; 1473 1474 case OSIOCGIFBRDADDR: 1475 cmd = SIOCGIFBRDADDR; 1476 break; 1477 1478 case OSIOCGIFNETMASK: 1479 cmd = SIOCGIFNETMASK; 1480 } 1481 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 1482 cmd, 1483 data, 1484 ifp, td)); 1485 switch (ocmd) { 1486 1487 case OSIOCGIFADDR: 1488 case OSIOCGIFDSTADDR: 1489 case OSIOCGIFBRDADDR: 1490 case OSIOCGIFNETMASK: 1491 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 1492 1493 } 1494 } 1495 #endif /* COMPAT_43 */ 1496 1497 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 1498 #ifdef INET6 1499 DELAY(100);/* XXX: temporary workaround for fxp issue*/ 1500 if (ifp->if_flags & IFF_UP) { 1501 int s = splimp(); 1502 in6_if_up(ifp); 1503 splx(s); 1504 } 1505 #endif 1506 } 1507 return (error); 1508 } 1509 1510 /* 1511 * Set/clear promiscuous mode on interface ifp based on the truth value 1512 * of pswitch. The calls are reference counted so that only the first 1513 * "on" request actually has an effect, as does the final "off" request. 1514 * Results are undefined if the "off" and "on" requests are not matched. 1515 */ 1516 int 1517 ifpromisc(struct ifnet *ifp, int pswitch) 1518 { 1519 struct ifreq ifr; 1520 int error; 1521 int oldflags, oldpcount; 1522 1523 oldpcount = ifp->if_pcount; 1524 oldflags = ifp->if_flags; 1525 if (ifp->if_flags & IFF_PPROMISC) { 1526 /* Do nothing if device is in permanently promiscuous mode */ 1527 ifp->if_pcount += pswitch ? 1 : -1; 1528 return (0); 1529 } 1530 if (pswitch) { 1531 /* 1532 * If the device is not configured up, we cannot put it in 1533 * promiscuous mode. 1534 */ 1535 if ((ifp->if_flags & IFF_UP) == 0) 1536 return (ENETDOWN); 1537 if (ifp->if_pcount++ != 0) 1538 return (0); 1539 ifp->if_flags |= IFF_PROMISC; 1540 } else { 1541 if (--ifp->if_pcount > 0) 1542 return (0); 1543 ifp->if_flags &= ~IFF_PROMISC; 1544 } 1545 ifr.ifr_flags = ifp->if_flags & 0xffff; 1546 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1547 IFF_LOCKGIANT(ifp); 1548 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1549 IFF_UNLOCKGIANT(ifp); 1550 if (error == 0) { 1551 log(LOG_INFO, "%s: promiscuous mode %s\n", 1552 ifp->if_xname, 1553 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 1554 rt_ifmsg(ifp); 1555 } else { 1556 ifp->if_pcount = oldpcount; 1557 ifp->if_flags = oldflags; 1558 } 1559 return error; 1560 } 1561 1562 /* 1563 * Return interface configuration 1564 * of system. List may be used 1565 * in later ioctl's (above) to get 1566 * other information. 1567 */ 1568 /*ARGSUSED*/ 1569 static int 1570 ifconf(u_long cmd, caddr_t data) 1571 { 1572 struct ifconf *ifc = (struct ifconf *)data; 1573 struct ifnet *ifp; 1574 struct ifaddr *ifa; 1575 struct ifreq ifr; 1576 struct sbuf *sb; 1577 int error, full = 0, valid_len, max_len; 1578 1579 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 1580 max_len = MAXPHYS - 1; 1581 1582 /* Prevent hostile input from being able to crash the system */ 1583 if (ifc->ifc_len <= 0) 1584 return (EINVAL); 1585 1586 again: 1587 if (ifc->ifc_len <= max_len) { 1588 max_len = ifc->ifc_len; 1589 full = 1; 1590 } 1591 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 1592 max_len = 0; 1593 valid_len = 0; 1594 1595 IFNET_RLOCK(); /* could sleep XXX */ 1596 TAILQ_FOREACH(ifp, &ifnet, if_link) { 1597 int addrs; 1598 1599 /* 1600 * Zero the ifr_name buffer to make sure we don't 1601 * disclose the contents of the stack. 1602 */ 1603 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 1604 1605 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 1606 >= sizeof(ifr.ifr_name)) 1607 return (ENAMETOOLONG); 1608 1609 addrs = 0; 1610 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1611 struct sockaddr *sa = ifa->ifa_addr; 1612 1613 if (jailed(curthread->td_ucred) && 1614 prison_if(curthread->td_ucred, sa)) 1615 continue; 1616 addrs++; 1617 #ifdef COMPAT_43 1618 if (cmd == OSIOCGIFCONF) { 1619 struct osockaddr *osa = 1620 (struct osockaddr *)&ifr.ifr_addr; 1621 ifr.ifr_addr = *sa; 1622 osa->sa_family = sa->sa_family; 1623 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1624 max_len += sizeof(ifr); 1625 } else 1626 #endif 1627 if (sa->sa_len <= sizeof(*sa)) { 1628 ifr.ifr_addr = *sa; 1629 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1630 max_len += sizeof(ifr); 1631 } else { 1632 sbuf_bcat(sb, &ifr, 1633 offsetof(struct ifreq, ifr_addr)); 1634 max_len += offsetof(struct ifreq, ifr_addr); 1635 sbuf_bcat(sb, sa, sa->sa_len); 1636 max_len += sa->sa_len; 1637 } 1638 1639 if (!sbuf_overflowed(sb)) 1640 valid_len = sbuf_len(sb); 1641 } 1642 if (addrs == 0) { 1643 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 1644 sbuf_bcat(sb, &ifr, sizeof(ifr)); 1645 max_len += sizeof(ifr); 1646 1647 if (!sbuf_overflowed(sb)) 1648 valid_len = sbuf_len(sb); 1649 } 1650 } 1651 IFNET_RUNLOCK(); 1652 1653 /* 1654 * If we didn't allocate enough space (uncommon), try again. If 1655 * we have already allocated as much space as we are allowed, 1656 * return what we've got. 1657 */ 1658 if (valid_len != max_len && !full) { 1659 sbuf_delete(sb); 1660 goto again; 1661 } 1662 1663 ifc->ifc_len = valid_len; 1664 sbuf_finish(sb); 1665 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 1666 sbuf_delete(sb); 1667 return (error); 1668 } 1669 1670 /* 1671 * Just like ifpromisc(), but for all-multicast-reception mode. 1672 */ 1673 int 1674 if_allmulti(struct ifnet *ifp, int onswitch) 1675 { 1676 int error = 0; 1677 int s = splimp(); 1678 struct ifreq ifr; 1679 1680 if (onswitch) { 1681 if (ifp->if_amcount++ == 0) { 1682 ifp->if_flags |= IFF_ALLMULTI; 1683 ifr.ifr_flags = ifp->if_flags & 0xffff; 1684 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1685 IFF_LOCKGIANT(ifp); 1686 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1687 IFF_UNLOCKGIANT(ifp); 1688 } 1689 } else { 1690 if (ifp->if_amcount > 1) { 1691 ifp->if_amcount--; 1692 } else { 1693 ifp->if_amcount = 0; 1694 ifp->if_flags &= ~IFF_ALLMULTI; 1695 ifr.ifr_flags = ifp->if_flags & 0xffff;; 1696 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1697 IFF_LOCKGIANT(ifp); 1698 error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1699 IFF_UNLOCKGIANT(ifp); 1700 } 1701 } 1702 splx(s); 1703 1704 if (error == 0) 1705 rt_ifmsg(ifp); 1706 return error; 1707 } 1708 1709 /* 1710 * Add a multicast listenership to the interface in question. 1711 * The link layer provides a routine which converts 1712 */ 1713 int 1714 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, struct ifmultiaddr **retifma) 1715 { 1716 struct sockaddr *llsa, *dupsa; 1717 int error, s; 1718 struct ifmultiaddr *ifma; 1719 1720 /* 1721 * If the matching multicast address already exists 1722 * then don't add a new one, just add a reference 1723 */ 1724 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1725 if (equal(sa, ifma->ifma_addr)) { 1726 ifma->ifma_refcount++; 1727 if (retifma) 1728 *retifma = ifma; 1729 return 0; 1730 } 1731 } 1732 1733 /* 1734 * Give the link layer a chance to accept/reject it, and also 1735 * find out which AF_LINK address this maps to, if it isn't one 1736 * already. 1737 */ 1738 if (ifp->if_resolvemulti) { 1739 error = ifp->if_resolvemulti(ifp, &llsa, sa); 1740 if (error) return error; 1741 } else { 1742 llsa = 0; 1743 } 1744 1745 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK); 1746 MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK); 1747 bcopy(sa, dupsa, sa->sa_len); 1748 1749 ifma->ifma_addr = dupsa; 1750 ifma->ifma_lladdr = llsa; 1751 ifma->ifma_ifp = ifp; 1752 ifma->ifma_refcount = 1; 1753 ifma->ifma_protospec = NULL; 1754 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 1755 1756 /* 1757 * Some network interfaces can scan the address list at 1758 * interrupt time; lock them out. 1759 */ 1760 s = splimp(); 1761 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1762 splx(s); 1763 if (retifma != NULL) 1764 *retifma = ifma; 1765 1766 if (llsa != 0) { 1767 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 1768 if (equal(ifma->ifma_addr, llsa)) 1769 break; 1770 } 1771 if (ifma) { 1772 ifma->ifma_refcount++; 1773 } else { 1774 MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, 1775 M_IFMADDR, M_WAITOK); 1776 MALLOC(dupsa, struct sockaddr *, llsa->sa_len, 1777 M_IFMADDR, M_WAITOK); 1778 bcopy(llsa, dupsa, llsa->sa_len); 1779 ifma->ifma_addr = dupsa; 1780 ifma->ifma_lladdr = NULL; 1781 ifma->ifma_ifp = ifp; 1782 ifma->ifma_refcount = 1; 1783 ifma->ifma_protospec = NULL; 1784 s = splimp(); 1785 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 1786 splx(s); 1787 } 1788 } 1789 /* 1790 * We are certain we have added something, so call down to the 1791 * interface to let them know about it. 1792 */ 1793 s = splimp(); 1794 IFF_LOCKGIANT(ifp); 1795 ifp->if_ioctl(ifp, SIOCADDMULTI, 0); 1796 IFF_UNLOCKGIANT(ifp); 1797 splx(s); 1798 1799 return 0; 1800 } 1801 1802 /* 1803 * Remove a reference to a multicast address on this interface. Yell 1804 * if the request does not match an existing membership. 1805 */ 1806 int 1807 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 1808 { 1809 struct ifmultiaddr *ifma; 1810 int s; 1811 1812 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1813 if (equal(sa, ifma->ifma_addr)) 1814 break; 1815 if (ifma == 0) 1816 return ENOENT; 1817 1818 if (ifma->ifma_refcount > 1) { 1819 ifma->ifma_refcount--; 1820 return 0; 1821 } 1822 1823 rt_newmaddrmsg(RTM_DELMADDR, ifma); 1824 sa = ifma->ifma_lladdr; 1825 s = splimp(); 1826 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1827 /* 1828 * Make sure the interface driver is notified 1829 * in the case of a link layer mcast group being left. 1830 */ 1831 if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0) { 1832 IFF_LOCKGIANT(ifp); 1833 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1834 IFF_UNLOCKGIANT(ifp); 1835 } 1836 splx(s); 1837 free(ifma->ifma_addr, M_IFMADDR); 1838 free(ifma, M_IFMADDR); 1839 if (sa == 0) 1840 return 0; 1841 1842 /* 1843 * Now look for the link-layer address which corresponds to 1844 * this network address. It had been squirreled away in 1845 * ifma->ifma_lladdr for this purpose (so we don't have 1846 * to call ifp->if_resolvemulti() again), and we saved that 1847 * value in sa above. If some nasty deleted the 1848 * link-layer address out from underneath us, we can deal because 1849 * the address we stored was is not the same as the one which was 1850 * in the record for the link-layer address. (So we don't complain 1851 * in that case.) 1852 */ 1853 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1854 if (equal(sa, ifma->ifma_addr)) 1855 break; 1856 if (ifma == 0) 1857 return 0; 1858 1859 if (ifma->ifma_refcount > 1) { 1860 ifma->ifma_refcount--; 1861 return 0; 1862 } 1863 1864 s = splimp(); 1865 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 1866 IFF_LOCKGIANT(ifp); 1867 ifp->if_ioctl(ifp, SIOCDELMULTI, 0); 1868 IFF_UNLOCKGIANT(ifp); 1869 splx(s); 1870 free(ifma->ifma_addr, M_IFMADDR); 1871 free(sa, M_IFMADDR); 1872 free(ifma, M_IFMADDR); 1873 1874 return 0; 1875 } 1876 1877 /* 1878 * Set the link layer address on an interface. 1879 * 1880 * At this time we only support certain types of interfaces, 1881 * and we don't allow the length of the address to change. 1882 */ 1883 int 1884 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 1885 { 1886 struct sockaddr_dl *sdl; 1887 struct ifaddr *ifa; 1888 struct ifreq ifr; 1889 1890 ifa = ifaddr_byindex(ifp->if_index); 1891 if (ifa == NULL) 1892 return (EINVAL); 1893 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1894 if (sdl == NULL) 1895 return (EINVAL); 1896 if (len != sdl->sdl_alen) /* don't allow length to change */ 1897 return (EINVAL); 1898 switch (ifp->if_type) { 1899 case IFT_ETHER: /* these types use struct arpcom */ 1900 case IFT_FDDI: 1901 case IFT_XETHER: 1902 case IFT_ISO88025: 1903 case IFT_L2VLAN: 1904 bcopy(lladdr, IFP2AC(ifp)->ac_enaddr, len); 1905 /* 1906 * XXX We also need to store the lladdr in LLADDR(sdl), 1907 * which is done below. This is a pain because we must 1908 * remember to keep the info in sync. 1909 */ 1910 /* FALLTHROUGH */ 1911 case IFT_ARCNET: 1912 bcopy(lladdr, LLADDR(sdl), len); 1913 break; 1914 default: 1915 return (ENODEV); 1916 } 1917 /* 1918 * If the interface is already up, we need 1919 * to re-init it in order to reprogram its 1920 * address filter. 1921 */ 1922 if ((ifp->if_flags & IFF_UP) != 0) { 1923 IFF_LOCKGIANT(ifp); 1924 ifp->if_flags &= ~IFF_UP; 1925 ifr.ifr_flags = ifp->if_flags & 0xffff; 1926 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1927 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1928 ifp->if_flags |= IFF_UP; 1929 ifr.ifr_flags = ifp->if_flags & 0xffff; 1930 ifr.ifr_flagshigh = ifp->if_flags >> 16; 1931 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 1932 IFF_UNLOCKGIANT(ifp); 1933 #ifdef INET 1934 /* 1935 * Also send gratuitous ARPs to notify other nodes about 1936 * the address change. 1937 */ 1938 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1939 if (ifa->ifa_addr != NULL && 1940 ifa->ifa_addr->sa_family == AF_INET) 1941 arp_ifinit(ifp, ifa); 1942 } 1943 #endif 1944 } 1945 return (0); 1946 } 1947 1948 struct ifmultiaddr * 1949 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp) 1950 { 1951 struct ifmultiaddr *ifma; 1952 1953 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) 1954 if (equal(ifma->ifma_addr, sa)) 1955 break; 1956 1957 return ifma; 1958 } 1959 1960 /* 1961 * The name argument must be a pointer to storage which will last as 1962 * long as the interface does. For physical devices, the result of 1963 * device_get_name(dev) is a good choice and for pseudo-devices a 1964 * static string works well. 1965 */ 1966 void 1967 if_initname(struct ifnet *ifp, const char *name, int unit) 1968 { 1969 ifp->if_dname = name; 1970 ifp->if_dunit = unit; 1971 if (unit != IF_DUNIT_NONE) 1972 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 1973 else 1974 strlcpy(ifp->if_xname, name, IFNAMSIZ); 1975 } 1976 1977 int 1978 if_printf(struct ifnet *ifp, const char * fmt, ...) 1979 { 1980 va_list ap; 1981 int retval; 1982 1983 retval = printf("%s: ", ifp->if_xname); 1984 va_start(ap, fmt); 1985 retval += vprintf(fmt, ap); 1986 va_end(ap); 1987 return (retval); 1988 } 1989 1990 /* 1991 * When an interface is marked IFF_NEEDSGIANT, its if_start() routine cannot 1992 * be called without Giant. However, we often can't acquire the Giant lock 1993 * at those points; instead, we run it via a task queue that holds Giant via 1994 * if_start_deferred. 1995 * 1996 * XXXRW: We need to make sure that the ifnet isn't fully detached until any 1997 * outstanding if_start_deferred() tasks that will run after the free. This 1998 * probably means waiting in if_detach(). 1999 */ 2000 void 2001 if_start(struct ifnet *ifp) 2002 { 2003 2004 NET_ASSERT_GIANT(); 2005 2006 if ((ifp->if_flags & IFF_NEEDSGIANT) != 0 && debug_mpsafenet != 0) { 2007 if (mtx_owned(&Giant)) 2008 (*(ifp)->if_start)(ifp); 2009 else 2010 taskqueue_enqueue(taskqueue_swi_giant, 2011 &ifp->if_starttask); 2012 } else 2013 (*(ifp)->if_start)(ifp); 2014 } 2015 2016 static void 2017 if_start_deferred(void *context, int pending) 2018 { 2019 struct ifnet *ifp; 2020 2021 /* 2022 * This code must be entered with Giant, and should never run if 2023 * we're not running with debug.mpsafenet. 2024 */ 2025 KASSERT(debug_mpsafenet != 0, ("if_start_deferred: debug.mpsafenet")); 2026 GIANT_REQUIRED; 2027 2028 ifp = (struct ifnet *)context; 2029 (ifp->if_start)(ifp); 2030 } 2031 2032 int 2033 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 2034 { 2035 int active = 0; 2036 2037 IF_LOCK(ifq); 2038 if (_IF_QFULL(ifq)) { 2039 _IF_DROP(ifq); 2040 IF_UNLOCK(ifq); 2041 m_freem(m); 2042 return (0); 2043 } 2044 if (ifp != NULL) { 2045 ifp->if_obytes += m->m_pkthdr.len + adjust; 2046 if (m->m_flags & (M_BCAST|M_MCAST)) 2047 ifp->if_omcasts++; 2048 active = ifp->if_flags & IFF_OACTIVE; 2049 } 2050 _IF_ENQUEUE(ifq, m); 2051 IF_UNLOCK(ifq); 2052 if (ifp != NULL && !active) 2053 if_start(ifp); 2054 return (1); 2055 } 2056