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 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/conf.h> 40 #include <sys/malloc.h> 41 #include <sys/sbuf.h> 42 #include <sys/bus.h> 43 #include <sys/mbuf.h> 44 #include <sys/systm.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/protosw.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/refcount.h> 53 #include <sys/module.h> 54 #include <sys/rwlock.h> 55 #include <sys/sockio.h> 56 #include <sys/syslog.h> 57 #include <sys/sysctl.h> 58 #include <sys/taskqueue.h> 59 #include <sys/domain.h> 60 #include <sys/jail.h> 61 #include <machine/stdarg.h> 62 #include <vm/uma.h> 63 64 #include <net/if.h> 65 #include <net/if_arp.h> 66 #include <net/if_clone.h> 67 #include <net/if_dl.h> 68 #include <net/if_types.h> 69 #include <net/if_var.h> 70 #include <net/radix.h> 71 #include <net/route.h> 72 #include <net/vnet.h> 73 74 #if defined(INET) || defined(INET6) 75 /*XXX*/ 76 #include <netinet/in.h> 77 #include <netinet/in_var.h> 78 #include <netinet/ip_carp.h> 79 #ifdef INET6 80 #include <netinet6/in6_var.h> 81 #include <netinet6/in6_ifattach.h> 82 #endif 83 #endif 84 #ifdef INET 85 #include <netinet/if_ether.h> 86 #endif 87 88 #include <security/mac/mac_framework.h> 89 90 #ifdef COMPAT_FREEBSD32 91 #include <sys/mount.h> 92 #include <compat/freebsd32/freebsd32.h> 93 #endif 94 95 struct ifindex_entry { 96 struct ifnet *ife_ifnet; 97 }; 98 99 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 100 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 101 102 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 103 SYSCTL_UINT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 104 &ifqmaxlen, 0, "max send queue size"); 105 106 /* Log link state change events */ 107 static int log_link_state_change = 1; 108 109 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 110 &log_link_state_change, 0, 111 "log interface link state change events"); 112 113 /* Interface description */ 114 static unsigned int ifdescr_maxlen = 1024; 115 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 116 &ifdescr_maxlen, 0, 117 "administrative maximum length for interface description"); 118 119 MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 120 121 /* global sx for non-critical path ifdescr */ 122 static struct sx ifdescr_sx; 123 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 124 125 void (*bstp_linkstate_p)(struct ifnet *ifp, int state); 126 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 127 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 128 /* These are external hooks for CARP. */ 129 void (*carp_linkstate_p)(struct ifnet *ifp); 130 #if defined(INET) || defined(INET6) 131 struct ifnet *(*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 132 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 133 struct sockaddr *sa, struct rtentry *rt); 134 #endif 135 #ifdef INET 136 int (*carp_iamatch_p)(struct ifnet *, struct in_ifaddr *, struct in_addr *, 137 u_int8_t **); 138 #endif 139 #ifdef INET6 140 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 141 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 142 const struct in6_addr *taddr); 143 #endif 144 145 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 146 147 /* 148 * XXX: Style; these should be sorted alphabetically, and unprototyped 149 * static functions should be prototyped. Currently they are sorted by 150 * declaration order. 151 */ 152 static void if_attachdomain(void *); 153 static void if_attachdomain1(struct ifnet *); 154 static int ifconf(u_long, caddr_t); 155 static void if_freemulti(struct ifmultiaddr *); 156 static void if_init(void *); 157 static void if_grow(void); 158 static void if_route(struct ifnet *, int flag, int fam); 159 static int if_setflag(struct ifnet *, int, int, int *, int); 160 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 161 static void if_unroute(struct ifnet *, int flag, int fam); 162 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 163 static int if_rtdel(struct radix_node *, void *); 164 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 165 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 166 static void do_link_state_change(void *, int); 167 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 168 static int if_getgroupmembers(struct ifgroupreq *); 169 static void if_delgroups(struct ifnet *); 170 static void if_attach_internal(struct ifnet *, int); 171 static void if_detach_internal(struct ifnet *, int); 172 173 #ifdef INET6 174 /* 175 * XXX: declare here to avoid to include many inet6 related files.. 176 * should be more generalized? 177 */ 178 extern void nd6_setmtu(struct ifnet *); 179 #endif 180 181 VNET_DEFINE(int, if_index); 182 int ifqmaxlen = IFQ_MAXLEN; 183 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 184 VNET_DEFINE(struct ifgrouphead, ifg_head); 185 186 static VNET_DEFINE(int, if_indexlim) = 8; 187 188 /* Table of ifnet by index. */ 189 VNET_DEFINE(struct ifindex_entry *, ifindex_table); 190 191 #define V_if_indexlim VNET(if_indexlim) 192 #define V_ifindex_table VNET(ifindex_table) 193 194 /* 195 * The global network interface list (V_ifnet) and related state (such as 196 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 197 * an rwlock. Either may be acquired shared to stablize the list, but both 198 * must be acquired writable to modify the list. This model allows us to 199 * both stablize the interface list during interrupt thread processing, but 200 * also to stablize it over long-running ioctls, without introducing priority 201 * inversions and deadlocks. 202 */ 203 struct rwlock ifnet_rwlock; 204 struct sx ifnet_sxlock; 205 206 /* 207 * The allocation of network interfaces is a rather non-atomic affair; we 208 * need to select an index before we are ready to expose the interface for 209 * use, so will use this pointer value to indicate reservation. 210 */ 211 #define IFNET_HOLD (void *)(uintptr_t)(-1) 212 213 static if_com_alloc_t *if_com_alloc[256]; 214 static if_com_free_t *if_com_free[256]; 215 216 MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 217 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 218 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 219 220 struct ifnet * 221 ifnet_byindex_locked(u_short idx) 222 { 223 224 if (idx > V_if_index) 225 return (NULL); 226 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 227 return (NULL); 228 return (V_ifindex_table[idx].ife_ifnet); 229 } 230 231 struct ifnet * 232 ifnet_byindex(u_short idx) 233 { 234 struct ifnet *ifp; 235 236 IFNET_RLOCK_NOSLEEP(); 237 ifp = ifnet_byindex_locked(idx); 238 IFNET_RUNLOCK_NOSLEEP(); 239 return (ifp); 240 } 241 242 struct ifnet * 243 ifnet_byindex_ref(u_short idx) 244 { 245 struct ifnet *ifp; 246 247 IFNET_RLOCK_NOSLEEP(); 248 ifp = ifnet_byindex_locked(idx); 249 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 250 IFNET_RUNLOCK_NOSLEEP(); 251 return (NULL); 252 } 253 if_ref(ifp); 254 IFNET_RUNLOCK_NOSLEEP(); 255 return (ifp); 256 } 257 258 /* 259 * Allocate an ifindex array entry; return 0 on success or an error on 260 * failure. 261 */ 262 static int 263 ifindex_alloc_locked(u_short *idxp) 264 { 265 u_short idx; 266 267 IFNET_WLOCK_ASSERT(); 268 269 /* 270 * Try to find an empty slot below V_if_index. If we fail, take the 271 * next slot. 272 */ 273 for (idx = 1; idx <= V_if_index; idx++) { 274 if (V_ifindex_table[idx].ife_ifnet == NULL) 275 break; 276 } 277 278 /* Catch if_index overflow. */ 279 if (idx < 1) 280 return (ENOSPC); 281 if (idx > V_if_index) 282 V_if_index = idx; 283 if (V_if_index >= V_if_indexlim) 284 if_grow(); 285 *idxp = idx; 286 return (0); 287 } 288 289 static void 290 ifindex_free_locked(u_short idx) 291 { 292 293 IFNET_WLOCK_ASSERT(); 294 295 V_ifindex_table[idx].ife_ifnet = NULL; 296 while (V_if_index > 0 && 297 V_ifindex_table[V_if_index].ife_ifnet == NULL) 298 V_if_index--; 299 } 300 301 static void 302 ifindex_free(u_short idx) 303 { 304 305 IFNET_WLOCK(); 306 ifindex_free_locked(idx); 307 IFNET_WUNLOCK(); 308 } 309 310 static void 311 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 312 { 313 314 IFNET_WLOCK_ASSERT(); 315 316 V_ifindex_table[idx].ife_ifnet = ifp; 317 } 318 319 static void 320 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 321 { 322 323 IFNET_WLOCK(); 324 ifnet_setbyindex_locked(idx, ifp); 325 IFNET_WUNLOCK(); 326 } 327 328 struct ifaddr * 329 ifaddr_byindex(u_short idx) 330 { 331 struct ifaddr *ifa; 332 333 IFNET_RLOCK_NOSLEEP(); 334 ifa = ifnet_byindex_locked(idx)->if_addr; 335 if (ifa != NULL) 336 ifa_ref(ifa); 337 IFNET_RUNLOCK_NOSLEEP(); 338 return (ifa); 339 } 340 341 /* 342 * Network interface utility routines. 343 * 344 * Routines with ifa_ifwith* names take sockaddr *'s as 345 * parameters. 346 */ 347 348 static void 349 vnet_if_init(const void *unused __unused) 350 { 351 352 TAILQ_INIT(&V_ifnet); 353 TAILQ_INIT(&V_ifg_head); 354 if_grow(); /* create initial table */ 355 vnet_if_clone_init(); 356 } 357 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_FIRST, vnet_if_init, 358 NULL); 359 360 /* ARGSUSED*/ 361 static void 362 if_init(void *dummy __unused) 363 { 364 365 IFNET_LOCK_INIT(); 366 if_clone_init(); 367 } 368 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_SECOND, if_init, NULL); 369 370 371 #ifdef VIMAGE 372 static void 373 vnet_if_uninit(const void *unused __unused) 374 { 375 376 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet)); 377 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head)); 378 379 free((caddr_t)V_ifindex_table, M_IFNET); 380 } 381 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 382 vnet_if_uninit, NULL); 383 #endif 384 385 static void 386 if_grow(void) 387 { 388 u_int n; 389 struct ifindex_entry *e; 390 391 V_if_indexlim <<= 1; 392 n = V_if_indexlim * sizeof(*e); 393 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 394 if (V_ifindex_table != NULL) { 395 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 396 free((caddr_t)V_ifindex_table, M_IFNET); 397 } 398 V_ifindex_table = e; 399 } 400 401 /* 402 * Allocate a struct ifnet and an index for an interface. A layer 2 403 * common structure will also be allocated if an allocation routine is 404 * registered for the passed type. 405 */ 406 struct ifnet * 407 if_alloc(u_char type) 408 { 409 struct ifnet *ifp; 410 u_short idx; 411 412 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 413 IFNET_WLOCK(); 414 if (ifindex_alloc_locked(&idx) != 0) { 415 IFNET_WUNLOCK(); 416 free(ifp, M_IFNET); 417 return (NULL); 418 } 419 ifnet_setbyindex_locked(idx, IFNET_HOLD); 420 IFNET_WUNLOCK(); 421 ifp->if_index = idx; 422 ifp->if_type = type; 423 ifp->if_alloctype = type; 424 if (if_com_alloc[type] != NULL) { 425 ifp->if_l2com = if_com_alloc[type](type, ifp); 426 if (ifp->if_l2com == NULL) { 427 free(ifp, M_IFNET); 428 ifindex_free(idx); 429 return (NULL); 430 } 431 } 432 433 IF_ADDR_LOCK_INIT(ifp); 434 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 435 ifp->if_afdata_initialized = 0; 436 IF_AFDATA_LOCK_INIT(ifp); 437 TAILQ_INIT(&ifp->if_addrhead); 438 TAILQ_INIT(&ifp->if_prefixhead); 439 TAILQ_INIT(&ifp->if_multiaddrs); 440 TAILQ_INIT(&ifp->if_groups); 441 #ifdef MAC 442 mac_ifnet_init(ifp); 443 #endif 444 ifq_init(&ifp->if_snd, ifp); 445 446 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 447 ifnet_setbyindex(ifp->if_index, ifp); 448 return (ifp); 449 } 450 451 /* 452 * Do the actual work of freeing a struct ifnet, associated index, and layer 453 * 2 common structure. This call is made when the last reference to an 454 * interface is released. 455 */ 456 static void 457 if_free_internal(struct ifnet *ifp) 458 { 459 460 KASSERT((ifp->if_flags & IFF_DYING), 461 ("if_free_internal: interface not dying")); 462 463 IFNET_WLOCK(); 464 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 465 ("%s: freeing unallocated ifnet", ifp->if_xname)); 466 467 ifindex_free_locked(ifp->if_index); 468 IFNET_WUNLOCK(); 469 470 if (if_com_free[ifp->if_alloctype] != NULL) 471 if_com_free[ifp->if_alloctype](ifp->if_l2com, 472 ifp->if_alloctype); 473 474 #ifdef MAC 475 mac_ifnet_destroy(ifp); 476 #endif /* MAC */ 477 if (ifp->if_description != NULL) 478 free(ifp->if_description, M_IFDESCR); 479 IF_AFDATA_DESTROY(ifp); 480 IF_ADDR_LOCK_DESTROY(ifp); 481 ifq_delete(&ifp->if_snd); 482 free(ifp, M_IFNET); 483 } 484 485 /* 486 * This version should only be called by intefaces that switch their type 487 * after calling if_alloc(). if_free_type() will go away again now that we 488 * have if_alloctype to cache the original allocation type. For now, assert 489 * that they match, since we require that in practice. 490 */ 491 void 492 if_free_type(struct ifnet *ifp, u_char type) 493 { 494 495 KASSERT(ifp->if_alloctype == type, 496 ("if_free_type: type (%d) != alloctype (%d)", type, 497 ifp->if_alloctype)); 498 499 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 500 if (!refcount_release(&ifp->if_refcount)) 501 return; 502 if_free_internal(ifp); 503 } 504 505 /* 506 * This is the normal version of if_free(), used by device drivers to free a 507 * detached network interface. The contents of if_free_type() will move into 508 * here when if_free_type() goes away. 509 */ 510 void 511 if_free(struct ifnet *ifp) 512 { 513 514 if_free_type(ifp, ifp->if_alloctype); 515 } 516 517 /* 518 * Interfaces to keep an ifnet type-stable despite the possibility of the 519 * driver calling if_free(). If there are additional references, we defer 520 * freeing the underlying data structure. 521 */ 522 void 523 if_ref(struct ifnet *ifp) 524 { 525 526 /* We don't assert the ifnet list lock here, but arguably should. */ 527 refcount_acquire(&ifp->if_refcount); 528 } 529 530 void 531 if_rele(struct ifnet *ifp) 532 { 533 534 if (!refcount_release(&ifp->if_refcount)) 535 return; 536 if_free_internal(ifp); 537 } 538 539 void 540 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 541 { 542 543 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 544 545 if (ifq->ifq_maxlen == 0) 546 ifq->ifq_maxlen = ifqmaxlen; 547 548 ifq->altq_type = 0; 549 ifq->altq_disc = NULL; 550 ifq->altq_flags &= ALTQF_CANTCHANGE; 551 ifq->altq_tbr = NULL; 552 ifq->altq_ifp = ifp; 553 } 554 555 void 556 ifq_delete(struct ifaltq *ifq) 557 { 558 mtx_destroy(&ifq->ifq_mtx); 559 } 560 561 /* 562 * Perform generic interface initalization tasks and attach the interface 563 * to the list of "active" interfaces. If vmove flag is set on entry 564 * to if_attach_internal(), perform only a limited subset of initialization 565 * tasks, given that we are moving from one vnet to another an ifnet which 566 * has already been fully initialized. 567 * 568 * XXX: 569 * - The decision to return void and thus require this function to 570 * succeed is questionable. 571 * - We should probably do more sanity checking. For instance we don't 572 * do anything to insure if_xname is unique or non-empty. 573 */ 574 void 575 if_attach(struct ifnet *ifp) 576 { 577 578 if_attach_internal(ifp, 0); 579 } 580 581 static void 582 if_attach_internal(struct ifnet *ifp, int vmove) 583 { 584 unsigned socksize, ifasize; 585 int namelen, masklen; 586 struct sockaddr_dl *sdl; 587 struct ifaddr *ifa; 588 589 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 590 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 591 ifp->if_xname); 592 593 #ifdef VIMAGE 594 ifp->if_vnet = curvnet; 595 if (ifp->if_home_vnet == NULL) 596 ifp->if_home_vnet = curvnet; 597 #endif 598 599 if_addgroup(ifp, IFG_ALL); 600 601 getmicrotime(&ifp->if_lastchange); 602 ifp->if_data.ifi_epoch = time_uptime; 603 ifp->if_data.ifi_datalen = sizeof(struct if_data); 604 605 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 606 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 607 ("transmit and qflush must both either be set or both be NULL")); 608 if (ifp->if_transmit == NULL) { 609 ifp->if_transmit = if_transmit; 610 ifp->if_qflush = if_qflush; 611 } 612 613 if (!vmove) { 614 #ifdef MAC 615 mac_ifnet_create(ifp); 616 #endif 617 618 /* 619 * Create a Link Level name for this device. 620 */ 621 namelen = strlen(ifp->if_xname); 622 /* 623 * Always save enough space for any possiable name so we 624 * can do a rename in place later. 625 */ 626 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 627 socksize = masklen + ifp->if_addrlen; 628 if (socksize < sizeof(*sdl)) 629 socksize = sizeof(*sdl); 630 socksize = roundup2(socksize, sizeof(long)); 631 ifasize = sizeof(*ifa) + 2 * socksize; 632 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 633 ifa_init(ifa); 634 sdl = (struct sockaddr_dl *)(ifa + 1); 635 sdl->sdl_len = socksize; 636 sdl->sdl_family = AF_LINK; 637 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 638 sdl->sdl_nlen = namelen; 639 sdl->sdl_index = ifp->if_index; 640 sdl->sdl_type = ifp->if_type; 641 ifp->if_addr = ifa; 642 ifa->ifa_ifp = ifp; 643 ifa->ifa_rtrequest = link_rtrequest; 644 ifa->ifa_addr = (struct sockaddr *)sdl; 645 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 646 ifa->ifa_netmask = (struct sockaddr *)sdl; 647 sdl->sdl_len = masklen; 648 while (namelen != 0) 649 sdl->sdl_data[--namelen] = 0xff; 650 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 651 /* Reliably crash if used uninitialized. */ 652 ifp->if_broadcastaddr = NULL; 653 } 654 #ifdef VIMAGE 655 else { 656 /* 657 * Update the interface index in the link layer address 658 * of the interface. 659 */ 660 for (ifa = ifp->if_addr; ifa != NULL; 661 ifa = TAILQ_NEXT(ifa, ifa_link)) { 662 if (ifa->ifa_addr->sa_family == AF_LINK) { 663 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 664 sdl->sdl_index = ifp->if_index; 665 } 666 } 667 } 668 #endif 669 670 IFNET_WLOCK(); 671 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 672 #ifdef VIMAGE 673 curvnet->vnet_ifcnt++; 674 #endif 675 IFNET_WUNLOCK(); 676 677 if (domain_init_status >= 2) 678 if_attachdomain1(ifp); 679 680 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 681 if (IS_DEFAULT_VNET(curvnet)) 682 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 683 684 /* Announce the interface. */ 685 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 686 } 687 688 static void 689 if_attachdomain(void *dummy) 690 { 691 struct ifnet *ifp; 692 int s; 693 694 s = splnet(); 695 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 696 if_attachdomain1(ifp); 697 splx(s); 698 } 699 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 700 if_attachdomain, NULL); 701 702 static void 703 if_attachdomain1(struct ifnet *ifp) 704 { 705 struct domain *dp; 706 int s; 707 708 s = splnet(); 709 710 /* 711 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 712 * cannot lock ifp->if_afdata initialization, entirely. 713 */ 714 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 715 splx(s); 716 return; 717 } 718 if (ifp->if_afdata_initialized >= domain_init_status) { 719 IF_AFDATA_UNLOCK(ifp); 720 splx(s); 721 printf("if_attachdomain called more than once on %s\n", 722 ifp->if_xname); 723 return; 724 } 725 ifp->if_afdata_initialized = domain_init_status; 726 IF_AFDATA_UNLOCK(ifp); 727 728 /* address family dependent data region */ 729 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 730 for (dp = domains; dp; dp = dp->dom_next) { 731 if (dp->dom_ifattach) 732 ifp->if_afdata[dp->dom_family] = 733 (*dp->dom_ifattach)(ifp); 734 } 735 736 splx(s); 737 } 738 739 /* 740 * Remove any unicast or broadcast network addresses from an interface. 741 */ 742 void 743 if_purgeaddrs(struct ifnet *ifp) 744 { 745 struct ifaddr *ifa, *next; 746 747 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 748 if (ifa->ifa_addr->sa_family == AF_LINK) 749 continue; 750 #ifdef INET 751 /* XXX: Ugly!! ad hoc just for INET */ 752 if (ifa->ifa_addr->sa_family == AF_INET) { 753 struct ifaliasreq ifr; 754 755 bzero(&ifr, sizeof(ifr)); 756 ifr.ifra_addr = *ifa->ifa_addr; 757 if (ifa->ifa_dstaddr) 758 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 759 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 760 NULL) == 0) 761 continue; 762 } 763 #endif /* INET */ 764 #ifdef INET6 765 if (ifa->ifa_addr->sa_family == AF_INET6) { 766 in6_purgeaddr(ifa); 767 /* ifp_addrhead is already updated */ 768 continue; 769 } 770 #endif /* INET6 */ 771 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 772 ifa_free(ifa); 773 } 774 } 775 776 /* 777 * Remove any multicast network addresses from an interface when an ifnet 778 * is going away. 779 */ 780 static void 781 if_purgemaddrs(struct ifnet *ifp) 782 { 783 struct ifmultiaddr *ifma; 784 struct ifmultiaddr *next; 785 786 IF_ADDR_LOCK(ifp); 787 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 788 if_delmulti_locked(ifp, ifma, 1); 789 IF_ADDR_UNLOCK(ifp); 790 } 791 792 /* 793 * Detach an interface, removing it from the list of "active" interfaces. 794 * If vmove flag is set on entry to if_detach_internal(), perform only a 795 * limited subset of cleanup tasks, given that we are moving an ifnet from 796 * one vnet to another, where it must be fully operational. 797 * 798 * XXXRW: There are some significant questions about event ordering, and 799 * how to prevent things from starting to use the interface during detach. 800 */ 801 void 802 if_detach(struct ifnet *ifp) 803 { 804 805 if_detach_internal(ifp, 0); 806 } 807 808 static void 809 if_detach_internal(struct ifnet *ifp, int vmove) 810 { 811 struct ifaddr *ifa; 812 struct radix_node_head *rnh; 813 int i, j; 814 struct domain *dp; 815 struct ifnet *iter; 816 int found = 0; 817 818 IFNET_WLOCK(); 819 TAILQ_FOREACH(iter, &V_ifnet, if_link) 820 if (iter == ifp) { 821 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 822 found = 1; 823 break; 824 } 825 #ifdef VIMAGE 826 if (found) 827 curvnet->vnet_ifcnt--; 828 #endif 829 IFNET_WUNLOCK(); 830 if (!found) { 831 if (vmove) 832 panic("%s: ifp=%p not on the ifnet tailq %p", 833 __func__, ifp, &V_ifnet); 834 else 835 return; /* XXX this should panic as well? */ 836 } 837 838 /* 839 * Remove/wait for pending events. 840 */ 841 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 842 843 /* 844 * Remove routes and flush queues. 845 */ 846 if_down(ifp); 847 #ifdef ALTQ 848 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 849 altq_disable(&ifp->if_snd); 850 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 851 altq_detach(&ifp->if_snd); 852 #endif 853 854 if_purgeaddrs(ifp); 855 856 #ifdef INET 857 in_ifdetach(ifp); 858 #endif 859 860 #ifdef INET6 861 /* 862 * Remove all IPv6 kernel structs related to ifp. This should be done 863 * before removing routing entries below, since IPv6 interface direct 864 * routes are expected to be removed by the IPv6-specific kernel API. 865 * Otherwise, the kernel will detect some inconsistency and bark it. 866 */ 867 in6_ifdetach(ifp); 868 #endif 869 if_purgemaddrs(ifp); 870 871 if (!vmove) { 872 /* 873 * Prevent further calls into the device driver via ifnet. 874 */ 875 if_dead(ifp); 876 877 /* 878 * Remove link ifaddr pointer and maybe decrement if_index. 879 * Clean up all addresses. 880 */ 881 ifp->if_addr = NULL; 882 883 /* We can now free link ifaddr. */ 884 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 885 ifa = TAILQ_FIRST(&ifp->if_addrhead); 886 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 887 ifa_free(ifa); 888 } 889 } 890 891 /* 892 * Delete all remaining routes using this interface 893 * Unfortuneatly the only way to do this is to slog through 894 * the entire routing table looking for routes which point 895 * to this interface...oh well... 896 */ 897 for (i = 1; i <= AF_MAX; i++) { 898 for (j = 0; j < rt_numfibs; j++) { 899 rnh = rt_tables_get_rnh(j, i); 900 if (rnh == NULL) 901 continue; 902 RADIX_NODE_HEAD_LOCK(rnh); 903 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 904 RADIX_NODE_HEAD_UNLOCK(rnh); 905 } 906 } 907 908 /* Announce that the interface is gone. */ 909 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 910 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 911 if (IS_DEFAULT_VNET(curvnet)) 912 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 913 if_delgroups(ifp); 914 915 /* 916 * We cannot hold the lock over dom_ifdetach calls as they might 917 * sleep, for example trying to drain a callout, thus open up the 918 * theoretical race with re-attaching. 919 */ 920 IF_AFDATA_LOCK(ifp); 921 i = ifp->if_afdata_initialized; 922 ifp->if_afdata_initialized = 0; 923 IF_AFDATA_UNLOCK(ifp); 924 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 925 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 926 (*dp->dom_ifdetach)(ifp, 927 ifp->if_afdata[dp->dom_family]); 928 } 929 } 930 931 #ifdef VIMAGE 932 /* 933 * if_vmove() performs a limited version of if_detach() in current 934 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 935 * An attempt is made to shrink if_index in current vnet, find an 936 * unused if_index in target vnet and calls if_grow() if necessary, 937 * and finally find an unused if_xname for the target vnet. 938 */ 939 void 940 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 941 { 942 u_short idx; 943 944 /* 945 * Detach from current vnet, but preserve LLADDR info, do not 946 * mark as dead etc. so that the ifnet can be reattached later. 947 */ 948 if_detach_internal(ifp, 1); 949 950 /* 951 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 952 * the if_index for that vnet if possible. 953 * 954 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 955 * or we'd lock on one vnet and unlock on another. 956 */ 957 IFNET_WLOCK(); 958 ifindex_free_locked(ifp->if_index); 959 IFNET_WUNLOCK(); 960 961 /* 962 * Perform interface-specific reassignment tasks, if provided by 963 * the driver. 964 */ 965 if (ifp->if_reassign != NULL) 966 ifp->if_reassign(ifp, new_vnet, NULL); 967 968 /* 969 * Switch to the context of the target vnet. 970 */ 971 CURVNET_SET_QUIET(new_vnet); 972 973 IFNET_WLOCK(); 974 if (ifindex_alloc_locked(&idx) != 0) { 975 IFNET_WUNLOCK(); 976 panic("if_index overflow"); 977 } 978 ifp->if_index = idx; 979 ifnet_setbyindex_locked(ifp->if_index, ifp); 980 IFNET_WUNLOCK(); 981 982 if_attach_internal(ifp, 1); 983 984 CURVNET_RESTORE(); 985 } 986 987 /* 988 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 989 */ 990 static int 991 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 992 { 993 struct prison *pr; 994 struct ifnet *difp; 995 996 /* Try to find the prison within our visibility. */ 997 sx_slock(&allprison_lock); 998 pr = prison_find_child(td->td_ucred->cr_prison, jid); 999 sx_sunlock(&allprison_lock); 1000 if (pr == NULL) 1001 return (ENXIO); 1002 prison_hold_locked(pr); 1003 mtx_unlock(&pr->pr_mtx); 1004 1005 /* Do not try to move the iface from and to the same prison. */ 1006 if (pr->pr_vnet == ifp->if_vnet) { 1007 prison_free(pr); 1008 return (EEXIST); 1009 } 1010 1011 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1012 /* XXX Lock interfaces to avoid races. */ 1013 CURVNET_SET_QUIET(pr->pr_vnet); 1014 difp = ifunit(ifname); 1015 CURVNET_RESTORE(); 1016 if (difp != NULL) { 1017 prison_free(pr); 1018 return (EEXIST); 1019 } 1020 1021 /* Move the interface into the child jail/vnet. */ 1022 if_vmove(ifp, pr->pr_vnet); 1023 1024 /* Report the new if_xname back to the userland. */ 1025 sprintf(ifname, "%s", ifp->if_xname); 1026 1027 prison_free(pr); 1028 return (0); 1029 } 1030 1031 static int 1032 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1033 { 1034 struct prison *pr; 1035 struct vnet *vnet_dst; 1036 struct ifnet *ifp; 1037 1038 /* Try to find the prison within our visibility. */ 1039 sx_slock(&allprison_lock); 1040 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1041 sx_sunlock(&allprison_lock); 1042 if (pr == NULL) 1043 return (ENXIO); 1044 prison_hold_locked(pr); 1045 mtx_unlock(&pr->pr_mtx); 1046 1047 /* Make sure the named iface exists in the source prison/vnet. */ 1048 CURVNET_SET(pr->pr_vnet); 1049 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1050 if (ifp == NULL) { 1051 CURVNET_RESTORE(); 1052 prison_free(pr); 1053 return (ENXIO); 1054 } 1055 1056 /* Do not try to move the iface from and to the same prison. */ 1057 vnet_dst = TD_TO_VNET(td); 1058 if (vnet_dst == ifp->if_vnet) { 1059 CURVNET_RESTORE(); 1060 prison_free(pr); 1061 return (EEXIST); 1062 } 1063 1064 /* Get interface back from child jail/vnet. */ 1065 if_vmove(ifp, vnet_dst); 1066 CURVNET_RESTORE(); 1067 1068 /* Report the new if_xname back to the userland. */ 1069 sprintf(ifname, "%s", ifp->if_xname); 1070 1071 prison_free(pr); 1072 return (0); 1073 } 1074 #endif /* VIMAGE */ 1075 1076 /* 1077 * Add a group to an interface 1078 */ 1079 int 1080 if_addgroup(struct ifnet *ifp, const char *groupname) 1081 { 1082 struct ifg_list *ifgl; 1083 struct ifg_group *ifg = NULL; 1084 struct ifg_member *ifgm; 1085 1086 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1087 groupname[strlen(groupname) - 1] <= '9') 1088 return (EINVAL); 1089 1090 IFNET_WLOCK(); 1091 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1092 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1093 IFNET_WUNLOCK(); 1094 return (EEXIST); 1095 } 1096 1097 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1098 M_NOWAIT)) == NULL) { 1099 IFNET_WUNLOCK(); 1100 return (ENOMEM); 1101 } 1102 1103 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1104 M_TEMP, M_NOWAIT)) == NULL) { 1105 free(ifgl, M_TEMP); 1106 IFNET_WUNLOCK(); 1107 return (ENOMEM); 1108 } 1109 1110 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1111 if (!strcmp(ifg->ifg_group, groupname)) 1112 break; 1113 1114 if (ifg == NULL) { 1115 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1116 M_TEMP, M_NOWAIT)) == NULL) { 1117 free(ifgl, M_TEMP); 1118 free(ifgm, M_TEMP); 1119 IFNET_WUNLOCK(); 1120 return (ENOMEM); 1121 } 1122 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1123 ifg->ifg_refcnt = 0; 1124 TAILQ_INIT(&ifg->ifg_members); 1125 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1126 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1127 } 1128 1129 ifg->ifg_refcnt++; 1130 ifgl->ifgl_group = ifg; 1131 ifgm->ifgm_ifp = ifp; 1132 1133 IF_ADDR_LOCK(ifp); 1134 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1135 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1136 IF_ADDR_UNLOCK(ifp); 1137 1138 IFNET_WUNLOCK(); 1139 1140 EVENTHANDLER_INVOKE(group_change_event, groupname); 1141 1142 return (0); 1143 } 1144 1145 /* 1146 * Remove a group from an interface 1147 */ 1148 int 1149 if_delgroup(struct ifnet *ifp, const char *groupname) 1150 { 1151 struct ifg_list *ifgl; 1152 struct ifg_member *ifgm; 1153 1154 IFNET_WLOCK(); 1155 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1156 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1157 break; 1158 if (ifgl == NULL) { 1159 IFNET_WUNLOCK(); 1160 return (ENOENT); 1161 } 1162 1163 IF_ADDR_LOCK(ifp); 1164 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1165 IF_ADDR_UNLOCK(ifp); 1166 1167 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1168 if (ifgm->ifgm_ifp == ifp) 1169 break; 1170 1171 if (ifgm != NULL) { 1172 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1173 free(ifgm, M_TEMP); 1174 } 1175 1176 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1177 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1178 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1179 free(ifgl->ifgl_group, M_TEMP); 1180 } 1181 IFNET_WUNLOCK(); 1182 1183 free(ifgl, M_TEMP); 1184 1185 EVENTHANDLER_INVOKE(group_change_event, groupname); 1186 1187 return (0); 1188 } 1189 1190 /* 1191 * Remove an interface from all groups 1192 */ 1193 static void 1194 if_delgroups(struct ifnet *ifp) 1195 { 1196 struct ifg_list *ifgl; 1197 struct ifg_member *ifgm; 1198 char groupname[IFNAMSIZ]; 1199 1200 IFNET_WLOCK(); 1201 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1202 ifgl = TAILQ_FIRST(&ifp->if_groups); 1203 1204 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1205 1206 IF_ADDR_LOCK(ifp); 1207 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1208 IF_ADDR_UNLOCK(ifp); 1209 1210 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1211 if (ifgm->ifgm_ifp == ifp) 1212 break; 1213 1214 if (ifgm != NULL) { 1215 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1216 ifgm_next); 1217 free(ifgm, M_TEMP); 1218 } 1219 1220 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1221 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1222 EVENTHANDLER_INVOKE(group_detach_event, 1223 ifgl->ifgl_group); 1224 free(ifgl->ifgl_group, M_TEMP); 1225 } 1226 IFNET_WUNLOCK(); 1227 1228 free(ifgl, M_TEMP); 1229 1230 EVENTHANDLER_INVOKE(group_change_event, groupname); 1231 1232 IFNET_WLOCK(); 1233 } 1234 IFNET_WUNLOCK(); 1235 } 1236 1237 /* 1238 * Stores all groups from an interface in memory pointed 1239 * to by data 1240 */ 1241 static int 1242 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1243 { 1244 int len, error; 1245 struct ifg_list *ifgl; 1246 struct ifg_req ifgrq, *ifgp; 1247 struct ifgroupreq *ifgr = data; 1248 1249 if (ifgr->ifgr_len == 0) { 1250 IF_ADDR_LOCK(ifp); 1251 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1252 ifgr->ifgr_len += sizeof(struct ifg_req); 1253 IF_ADDR_UNLOCK(ifp); 1254 return (0); 1255 } 1256 1257 len = ifgr->ifgr_len; 1258 ifgp = ifgr->ifgr_groups; 1259 /* XXX: wire */ 1260 IF_ADDR_LOCK(ifp); 1261 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1262 if (len < sizeof(ifgrq)) { 1263 IF_ADDR_UNLOCK(ifp); 1264 return (EINVAL); 1265 } 1266 bzero(&ifgrq, sizeof ifgrq); 1267 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1268 sizeof(ifgrq.ifgrq_group)); 1269 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1270 IF_ADDR_UNLOCK(ifp); 1271 return (error); 1272 } 1273 len -= sizeof(ifgrq); 1274 ifgp++; 1275 } 1276 IF_ADDR_UNLOCK(ifp); 1277 1278 return (0); 1279 } 1280 1281 /* 1282 * Stores all members of a group in memory pointed to by data 1283 */ 1284 static int 1285 if_getgroupmembers(struct ifgroupreq *data) 1286 { 1287 struct ifgroupreq *ifgr = data; 1288 struct ifg_group *ifg; 1289 struct ifg_member *ifgm; 1290 struct ifg_req ifgrq, *ifgp; 1291 int len, error; 1292 1293 IFNET_RLOCK(); 1294 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1295 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1296 break; 1297 if (ifg == NULL) { 1298 IFNET_RUNLOCK(); 1299 return (ENOENT); 1300 } 1301 1302 if (ifgr->ifgr_len == 0) { 1303 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1304 ifgr->ifgr_len += sizeof(ifgrq); 1305 IFNET_RUNLOCK(); 1306 return (0); 1307 } 1308 1309 len = ifgr->ifgr_len; 1310 ifgp = ifgr->ifgr_groups; 1311 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1312 if (len < sizeof(ifgrq)) { 1313 IFNET_RUNLOCK(); 1314 return (EINVAL); 1315 } 1316 bzero(&ifgrq, sizeof ifgrq); 1317 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1318 sizeof(ifgrq.ifgrq_member)); 1319 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1320 IFNET_RUNLOCK(); 1321 return (error); 1322 } 1323 len -= sizeof(ifgrq); 1324 ifgp++; 1325 } 1326 IFNET_RUNLOCK(); 1327 1328 return (0); 1329 } 1330 1331 /* 1332 * Delete Routes for a Network Interface 1333 * 1334 * Called for each routing entry via the rnh->rnh_walktree() call above 1335 * to delete all route entries referencing a detaching network interface. 1336 * 1337 * Arguments: 1338 * rn pointer to node in the routing table 1339 * arg argument passed to rnh->rnh_walktree() - detaching interface 1340 * 1341 * Returns: 1342 * 0 successful 1343 * errno failed - reason indicated 1344 * 1345 */ 1346 static int 1347 if_rtdel(struct radix_node *rn, void *arg) 1348 { 1349 struct rtentry *rt = (struct rtentry *)rn; 1350 struct ifnet *ifp = arg; 1351 int err; 1352 1353 if (rt->rt_ifp == ifp) { 1354 1355 /* 1356 * Protect (sorta) against walktree recursion problems 1357 * with cloned routes 1358 */ 1359 if ((rt->rt_flags & RTF_UP) == 0) 1360 return (0); 1361 1362 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1363 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1364 (struct rtentry **) NULL, rt->rt_fibnum); 1365 if (err) { 1366 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1367 } 1368 } 1369 1370 return (0); 1371 } 1372 1373 /* 1374 * Wrapper functions for struct ifnet address list locking macros. These are 1375 * used by kernel modules to avoid encoding programming interface or binary 1376 * interface assumptions that may be violated when kernel-internal locking 1377 * approaches change. 1378 */ 1379 void 1380 if_addr_rlock(struct ifnet *ifp) 1381 { 1382 1383 IF_ADDR_LOCK(ifp); 1384 } 1385 1386 void 1387 if_addr_runlock(struct ifnet *ifp) 1388 { 1389 1390 IF_ADDR_UNLOCK(ifp); 1391 } 1392 1393 void 1394 if_maddr_rlock(struct ifnet *ifp) 1395 { 1396 1397 IF_ADDR_LOCK(ifp); 1398 } 1399 1400 void 1401 if_maddr_runlock(struct ifnet *ifp) 1402 { 1403 1404 IF_ADDR_UNLOCK(ifp); 1405 } 1406 1407 /* 1408 * Reference count functions for ifaddrs. 1409 */ 1410 void 1411 ifa_init(struct ifaddr *ifa) 1412 { 1413 1414 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1415 refcount_init(&ifa->ifa_refcnt, 1); 1416 } 1417 1418 void 1419 ifa_ref(struct ifaddr *ifa) 1420 { 1421 1422 refcount_acquire(&ifa->ifa_refcnt); 1423 } 1424 1425 void 1426 ifa_free(struct ifaddr *ifa) 1427 { 1428 1429 if (refcount_release(&ifa->ifa_refcnt)) { 1430 mtx_destroy(&ifa->ifa_mtx); 1431 free(ifa, M_IFADDR); 1432 } 1433 } 1434 1435 int 1436 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1437 { 1438 int error = 0; 1439 struct rtentry *rt = NULL; 1440 struct rt_addrinfo info; 1441 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1442 1443 bzero(&info, sizeof(info)); 1444 info.rti_ifp = V_loif; 1445 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1446 info.rti_info[RTAX_DST] = ia; 1447 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1448 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1449 1450 if (error == 0 && rt != NULL) { 1451 RT_LOCK(rt); 1452 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1453 ifa->ifa_ifp->if_type; 1454 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1455 ifa->ifa_ifp->if_index; 1456 RT_REMREF(rt); 1457 RT_UNLOCK(rt); 1458 } else if (error != 0) 1459 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n"); 1460 1461 return (error); 1462 } 1463 1464 int 1465 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1466 { 1467 int error = 0; 1468 struct rt_addrinfo info; 1469 struct sockaddr_dl null_sdl; 1470 1471 bzero(&null_sdl, sizeof(null_sdl)); 1472 null_sdl.sdl_len = sizeof(null_sdl); 1473 null_sdl.sdl_family = AF_LINK; 1474 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1475 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1476 bzero(&info, sizeof(info)); 1477 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1478 info.rti_info[RTAX_DST] = ia; 1479 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1480 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1481 1482 if (error != 0) 1483 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n"); 1484 1485 return (error); 1486 } 1487 1488 /* 1489 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1490 * structs used to represent other address families, it is necessary 1491 * to perform a different comparison. 1492 */ 1493 1494 #define sa_equal(a1, a2) \ 1495 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1496 1497 #define sa_dl_equal(a1, a2) \ 1498 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1499 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1500 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1501 LLADDR((struct sockaddr_dl *)(a2)), \ 1502 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1503 1504 /* 1505 * Locate an interface based on a complete address. 1506 */ 1507 /*ARGSUSED*/ 1508 static struct ifaddr * 1509 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1510 { 1511 struct ifnet *ifp; 1512 struct ifaddr *ifa; 1513 1514 IFNET_RLOCK_NOSLEEP(); 1515 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1516 IF_ADDR_LOCK(ifp); 1517 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1518 if (ifa->ifa_addr->sa_family != addr->sa_family) 1519 continue; 1520 if (sa_equal(addr, ifa->ifa_addr)) { 1521 if (getref) 1522 ifa_ref(ifa); 1523 IF_ADDR_UNLOCK(ifp); 1524 goto done; 1525 } 1526 /* IP6 doesn't have broadcast */ 1527 if ((ifp->if_flags & IFF_BROADCAST) && 1528 ifa->ifa_broadaddr && 1529 ifa->ifa_broadaddr->sa_len != 0 && 1530 sa_equal(ifa->ifa_broadaddr, addr)) { 1531 if (getref) 1532 ifa_ref(ifa); 1533 IF_ADDR_UNLOCK(ifp); 1534 goto done; 1535 } 1536 } 1537 IF_ADDR_UNLOCK(ifp); 1538 } 1539 ifa = NULL; 1540 done: 1541 IFNET_RUNLOCK_NOSLEEP(); 1542 return (ifa); 1543 } 1544 1545 struct ifaddr * 1546 ifa_ifwithaddr(struct sockaddr *addr) 1547 { 1548 1549 return (ifa_ifwithaddr_internal(addr, 1)); 1550 } 1551 1552 int 1553 ifa_ifwithaddr_check(struct sockaddr *addr) 1554 { 1555 1556 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1557 } 1558 1559 /* 1560 * Locate an interface based on the broadcast address. 1561 */ 1562 /* ARGSUSED */ 1563 struct ifaddr * 1564 ifa_ifwithbroadaddr(struct sockaddr *addr) 1565 { 1566 struct ifnet *ifp; 1567 struct ifaddr *ifa; 1568 1569 IFNET_RLOCK_NOSLEEP(); 1570 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1571 IF_ADDR_LOCK(ifp); 1572 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1573 if (ifa->ifa_addr->sa_family != addr->sa_family) 1574 continue; 1575 if ((ifp->if_flags & IFF_BROADCAST) && 1576 ifa->ifa_broadaddr && 1577 ifa->ifa_broadaddr->sa_len != 0 && 1578 sa_equal(ifa->ifa_broadaddr, addr)) { 1579 ifa_ref(ifa); 1580 IF_ADDR_UNLOCK(ifp); 1581 goto done; 1582 } 1583 } 1584 IF_ADDR_UNLOCK(ifp); 1585 } 1586 ifa = NULL; 1587 done: 1588 IFNET_RUNLOCK_NOSLEEP(); 1589 return (ifa); 1590 } 1591 1592 /* 1593 * Locate the point to point interface with a given destination address. 1594 */ 1595 /*ARGSUSED*/ 1596 struct ifaddr * 1597 ifa_ifwithdstaddr(struct sockaddr *addr) 1598 { 1599 struct ifnet *ifp; 1600 struct ifaddr *ifa; 1601 1602 IFNET_RLOCK_NOSLEEP(); 1603 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1604 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1605 continue; 1606 IF_ADDR_LOCK(ifp); 1607 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1608 if (ifa->ifa_addr->sa_family != addr->sa_family) 1609 continue; 1610 if (ifa->ifa_dstaddr != NULL && 1611 sa_equal(addr, ifa->ifa_dstaddr)) { 1612 ifa_ref(ifa); 1613 IF_ADDR_UNLOCK(ifp); 1614 goto done; 1615 } 1616 } 1617 IF_ADDR_UNLOCK(ifp); 1618 } 1619 ifa = NULL; 1620 done: 1621 IFNET_RUNLOCK_NOSLEEP(); 1622 return (ifa); 1623 } 1624 1625 /* 1626 * Find an interface on a specific network. If many, choice 1627 * is most specific found. 1628 */ 1629 struct ifaddr * 1630 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1631 { 1632 struct ifnet *ifp; 1633 struct ifaddr *ifa; 1634 struct ifaddr *ifa_maybe = NULL; 1635 u_int af = addr->sa_family; 1636 char *addr_data = addr->sa_data, *cplim; 1637 1638 /* 1639 * AF_LINK addresses can be looked up directly by their index number, 1640 * so do that if we can. 1641 */ 1642 if (af == AF_LINK) { 1643 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1644 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1645 return (ifaddr_byindex(sdl->sdl_index)); 1646 } 1647 1648 /* 1649 * Scan though each interface, looking for ones that have addresses 1650 * in this address family. Maintain a reference on ifa_maybe once 1651 * we find one, as we release the IF_ADDR_LOCK() that kept it stable 1652 * when we move onto the next interface. 1653 */ 1654 IFNET_RLOCK_NOSLEEP(); 1655 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1656 IF_ADDR_LOCK(ifp); 1657 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1658 char *cp, *cp2, *cp3; 1659 1660 if (ifa->ifa_addr->sa_family != af) 1661 next: continue; 1662 if (af == AF_INET && 1663 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1664 /* 1665 * This is a bit broken as it doesn't 1666 * take into account that the remote end may 1667 * be a single node in the network we are 1668 * looking for. 1669 * The trouble is that we don't know the 1670 * netmask for the remote end. 1671 */ 1672 if (ifa->ifa_dstaddr != NULL && 1673 sa_equal(addr, ifa->ifa_dstaddr)) { 1674 ifa_ref(ifa); 1675 IF_ADDR_UNLOCK(ifp); 1676 goto done; 1677 } 1678 } else { 1679 /* 1680 * if we have a special address handler, 1681 * then use it instead of the generic one. 1682 */ 1683 if (ifa->ifa_claim_addr) { 1684 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1685 ifa_ref(ifa); 1686 IF_ADDR_UNLOCK(ifp); 1687 goto done; 1688 } 1689 continue; 1690 } 1691 1692 /* 1693 * Scan all the bits in the ifa's address. 1694 * If a bit dissagrees with what we are 1695 * looking for, mask it with the netmask 1696 * to see if it really matters. 1697 * (A byte at a time) 1698 */ 1699 if (ifa->ifa_netmask == 0) 1700 continue; 1701 cp = addr_data; 1702 cp2 = ifa->ifa_addr->sa_data; 1703 cp3 = ifa->ifa_netmask->sa_data; 1704 cplim = ifa->ifa_netmask->sa_len 1705 + (char *)ifa->ifa_netmask; 1706 while (cp3 < cplim) 1707 if ((*cp++ ^ *cp2++) & *cp3++) 1708 goto next; /* next address! */ 1709 /* 1710 * If the netmask of what we just found 1711 * is more specific than what we had before 1712 * (if we had one) then remember the new one 1713 * before continuing to search 1714 * for an even better one. 1715 */ 1716 if (ifa_maybe == NULL || 1717 rn_refines((caddr_t)ifa->ifa_netmask, 1718 (caddr_t)ifa_maybe->ifa_netmask)) { 1719 if (ifa_maybe != NULL) 1720 ifa_free(ifa_maybe); 1721 ifa_maybe = ifa; 1722 ifa_ref(ifa_maybe); 1723 } 1724 } 1725 } 1726 IF_ADDR_UNLOCK(ifp); 1727 } 1728 ifa = ifa_maybe; 1729 ifa_maybe = NULL; 1730 done: 1731 IFNET_RUNLOCK_NOSLEEP(); 1732 if (ifa_maybe != NULL) 1733 ifa_free(ifa_maybe); 1734 return (ifa); 1735 } 1736 1737 /* 1738 * Find an interface address specific to an interface best matching 1739 * a given address. 1740 */ 1741 struct ifaddr * 1742 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1743 { 1744 struct ifaddr *ifa; 1745 char *cp, *cp2, *cp3; 1746 char *cplim; 1747 struct ifaddr *ifa_maybe = NULL; 1748 u_int af = addr->sa_family; 1749 1750 if (af >= AF_MAX) 1751 return (NULL); 1752 IF_ADDR_LOCK(ifp); 1753 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1754 if (ifa->ifa_addr->sa_family != af) 1755 continue; 1756 if (ifa_maybe == NULL) 1757 ifa_maybe = ifa; 1758 if (ifa->ifa_netmask == 0) { 1759 if (sa_equal(addr, ifa->ifa_addr) || 1760 (ifa->ifa_dstaddr && 1761 sa_equal(addr, ifa->ifa_dstaddr))) 1762 goto done; 1763 continue; 1764 } 1765 if (ifp->if_flags & IFF_POINTOPOINT) { 1766 if (sa_equal(addr, ifa->ifa_dstaddr)) 1767 goto done; 1768 } else { 1769 cp = addr->sa_data; 1770 cp2 = ifa->ifa_addr->sa_data; 1771 cp3 = ifa->ifa_netmask->sa_data; 1772 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1773 for (; cp3 < cplim; cp3++) 1774 if ((*cp++ ^ *cp2++) & *cp3) 1775 break; 1776 if (cp3 == cplim) 1777 goto done; 1778 } 1779 } 1780 ifa = ifa_maybe; 1781 done: 1782 if (ifa != NULL) 1783 ifa_ref(ifa); 1784 IF_ADDR_UNLOCK(ifp); 1785 return (ifa); 1786 } 1787 1788 #include <net/if_llatbl.h> 1789 1790 /* 1791 * Default action when installing a route with a Link Level gateway. 1792 * Lookup an appropriate real ifa to point to. 1793 * This should be moved to /sys/net/link.c eventually. 1794 */ 1795 static void 1796 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1797 { 1798 struct ifaddr *ifa, *oifa; 1799 struct sockaddr *dst; 1800 struct ifnet *ifp; 1801 1802 RT_LOCK_ASSERT(rt); 1803 1804 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1805 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1806 return; 1807 ifa = ifaof_ifpforaddr(dst, ifp); 1808 if (ifa) { 1809 oifa = rt->rt_ifa; 1810 rt->rt_ifa = ifa; 1811 ifa_free(oifa); 1812 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1813 ifa->ifa_rtrequest(cmd, rt, info); 1814 } 1815 } 1816 1817 /* 1818 * Mark an interface down and notify protocols of 1819 * the transition. 1820 * NOTE: must be called at splnet or eqivalent. 1821 */ 1822 static void 1823 if_unroute(struct ifnet *ifp, int flag, int fam) 1824 { 1825 struct ifaddr *ifa; 1826 1827 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1828 1829 ifp->if_flags &= ~flag; 1830 getmicrotime(&ifp->if_lastchange); 1831 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1832 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1833 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1834 ifp->if_qflush(ifp); 1835 1836 if (ifp->if_carp) 1837 (*carp_linkstate_p)(ifp); 1838 rt_ifmsg(ifp); 1839 } 1840 1841 /* 1842 * Mark an interface up and notify protocols of 1843 * the transition. 1844 * NOTE: must be called at splnet or eqivalent. 1845 */ 1846 static void 1847 if_route(struct ifnet *ifp, int flag, int fam) 1848 { 1849 struct ifaddr *ifa; 1850 1851 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1852 1853 ifp->if_flags |= flag; 1854 getmicrotime(&ifp->if_lastchange); 1855 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1856 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1857 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1858 if (ifp->if_carp) 1859 (*carp_linkstate_p)(ifp); 1860 rt_ifmsg(ifp); 1861 #ifdef INET6 1862 in6_if_up(ifp); 1863 #endif 1864 } 1865 1866 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1867 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1868 1869 /* 1870 * Handle a change in the interface link state. To avoid LORs 1871 * between driver lock and upper layer locks, as well as possible 1872 * recursions, we post event to taskqueue, and all job 1873 * is done in static do_link_state_change(). 1874 */ 1875 void 1876 if_link_state_change(struct ifnet *ifp, int link_state) 1877 { 1878 /* Return if state hasn't changed. */ 1879 if (ifp->if_link_state == link_state) 1880 return; 1881 1882 ifp->if_link_state = link_state; 1883 1884 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1885 } 1886 1887 static void 1888 do_link_state_change(void *arg, int pending) 1889 { 1890 struct ifnet *ifp = (struct ifnet *)arg; 1891 int link_state = ifp->if_link_state; 1892 CURVNET_SET(ifp->if_vnet); 1893 1894 /* Notify that the link state has changed. */ 1895 rt_ifmsg(ifp); 1896 if (ifp->if_vlantrunk != NULL) 1897 (*vlan_link_state_p)(ifp); 1898 1899 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1900 IFP2AC(ifp)->ac_netgraph != NULL) 1901 (*ng_ether_link_state_p)(ifp, link_state); 1902 if (ifp->if_carp) 1903 (*carp_linkstate_p)(ifp); 1904 if (ifp->if_bridge) { 1905 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1906 (*bstp_linkstate_p)(ifp, link_state); 1907 } 1908 if (ifp->if_lagg) { 1909 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1910 (*lagg_linkstate_p)(ifp, link_state); 1911 } 1912 1913 if (IS_DEFAULT_VNET(curvnet)) 1914 devctl_notify("IFNET", ifp->if_xname, 1915 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1916 NULL); 1917 if (pending > 1) 1918 if_printf(ifp, "%d link states coalesced\n", pending); 1919 if (log_link_state_change) 1920 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1921 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1922 CURVNET_RESTORE(); 1923 } 1924 1925 /* 1926 * Mark an interface down and notify protocols of 1927 * the transition. 1928 * NOTE: must be called at splnet or eqivalent. 1929 */ 1930 void 1931 if_down(struct ifnet *ifp) 1932 { 1933 1934 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1935 } 1936 1937 /* 1938 * Mark an interface up and notify protocols of 1939 * the transition. 1940 * NOTE: must be called at splnet or eqivalent. 1941 */ 1942 void 1943 if_up(struct ifnet *ifp) 1944 { 1945 1946 if_route(ifp, IFF_UP, AF_UNSPEC); 1947 } 1948 1949 /* 1950 * Flush an interface queue. 1951 */ 1952 void 1953 if_qflush(struct ifnet *ifp) 1954 { 1955 struct mbuf *m, *n; 1956 struct ifaltq *ifq; 1957 1958 ifq = &ifp->if_snd; 1959 IFQ_LOCK(ifq); 1960 #ifdef ALTQ 1961 if (ALTQ_IS_ENABLED(ifq)) 1962 ALTQ_PURGE(ifq); 1963 #endif 1964 n = ifq->ifq_head; 1965 while ((m = n) != 0) { 1966 n = m->m_act; 1967 m_freem(m); 1968 } 1969 ifq->ifq_head = 0; 1970 ifq->ifq_tail = 0; 1971 ifq->ifq_len = 0; 1972 IFQ_UNLOCK(ifq); 1973 } 1974 1975 /* 1976 * Map interface name to interface structure pointer, with or without 1977 * returning a reference. 1978 */ 1979 struct ifnet * 1980 ifunit_ref(const char *name) 1981 { 1982 struct ifnet *ifp; 1983 1984 IFNET_RLOCK_NOSLEEP(); 1985 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1986 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 1987 !(ifp->if_flags & IFF_DYING)) 1988 break; 1989 } 1990 if (ifp != NULL) 1991 if_ref(ifp); 1992 IFNET_RUNLOCK_NOSLEEP(); 1993 return (ifp); 1994 } 1995 1996 struct ifnet * 1997 ifunit(const char *name) 1998 { 1999 struct ifnet *ifp; 2000 2001 IFNET_RLOCK_NOSLEEP(); 2002 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2003 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2004 break; 2005 } 2006 IFNET_RUNLOCK_NOSLEEP(); 2007 return (ifp); 2008 } 2009 2010 /* 2011 * Hardware specific interface ioctls. 2012 */ 2013 static int 2014 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2015 { 2016 struct ifreq *ifr; 2017 struct ifstat *ifs; 2018 int error = 0; 2019 int new_flags, temp_flags; 2020 size_t namelen, onamelen; 2021 size_t descrlen; 2022 char *descrbuf, *odescrbuf; 2023 char new_name[IFNAMSIZ]; 2024 struct ifaddr *ifa; 2025 struct sockaddr_dl *sdl; 2026 2027 ifr = (struct ifreq *)data; 2028 switch (cmd) { 2029 case SIOCGIFINDEX: 2030 ifr->ifr_index = ifp->if_index; 2031 break; 2032 2033 case SIOCGIFFLAGS: 2034 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2035 ifr->ifr_flags = temp_flags & 0xffff; 2036 ifr->ifr_flagshigh = temp_flags >> 16; 2037 break; 2038 2039 case SIOCGIFCAP: 2040 ifr->ifr_reqcap = ifp->if_capabilities; 2041 ifr->ifr_curcap = ifp->if_capenable; 2042 break; 2043 2044 #ifdef MAC 2045 case SIOCGIFMAC: 2046 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2047 break; 2048 #endif 2049 2050 case SIOCGIFMETRIC: 2051 ifr->ifr_metric = ifp->if_metric; 2052 break; 2053 2054 case SIOCGIFMTU: 2055 ifr->ifr_mtu = ifp->if_mtu; 2056 break; 2057 2058 case SIOCGIFPHYS: 2059 ifr->ifr_phys = ifp->if_physical; 2060 break; 2061 2062 case SIOCGIFDESCR: 2063 error = 0; 2064 sx_slock(&ifdescr_sx); 2065 if (ifp->if_description == NULL) 2066 error = ENOMSG; 2067 else { 2068 /* space for terminating nul */ 2069 descrlen = strlen(ifp->if_description) + 1; 2070 if (ifr->ifr_buffer.length < descrlen) 2071 ifr->ifr_buffer.buffer = NULL; 2072 else 2073 error = copyout(ifp->if_description, 2074 ifr->ifr_buffer.buffer, descrlen); 2075 ifr->ifr_buffer.length = descrlen; 2076 } 2077 sx_sunlock(&ifdescr_sx); 2078 break; 2079 2080 case SIOCSIFDESCR: 2081 error = priv_check(td, PRIV_NET_SETIFDESCR); 2082 if (error) 2083 return (error); 2084 2085 /* 2086 * Copy only (length-1) bytes to make sure that 2087 * if_description is always nul terminated. The 2088 * length parameter is supposed to count the 2089 * terminating nul in. 2090 */ 2091 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2092 return (ENAMETOOLONG); 2093 else if (ifr->ifr_buffer.length == 0) 2094 descrbuf = NULL; 2095 else { 2096 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2097 M_WAITOK | M_ZERO); 2098 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2099 ifr->ifr_buffer.length - 1); 2100 if (error) { 2101 free(descrbuf, M_IFDESCR); 2102 break; 2103 } 2104 } 2105 2106 sx_xlock(&ifdescr_sx); 2107 odescrbuf = ifp->if_description; 2108 ifp->if_description = descrbuf; 2109 sx_xunlock(&ifdescr_sx); 2110 2111 getmicrotime(&ifp->if_lastchange); 2112 free(odescrbuf, M_IFDESCR); 2113 break; 2114 2115 case SIOCSIFFLAGS: 2116 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2117 if (error) 2118 return (error); 2119 /* 2120 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2121 * check, so we don't need special handling here yet. 2122 */ 2123 new_flags = (ifr->ifr_flags & 0xffff) | 2124 (ifr->ifr_flagshigh << 16); 2125 if (ifp->if_flags & IFF_SMART) { 2126 /* Smart drivers twiddle their own routes */ 2127 } else if (ifp->if_flags & IFF_UP && 2128 (new_flags & IFF_UP) == 0) { 2129 int s = splimp(); 2130 if_down(ifp); 2131 splx(s); 2132 } else if (new_flags & IFF_UP && 2133 (ifp->if_flags & IFF_UP) == 0) { 2134 int s = splimp(); 2135 if_up(ifp); 2136 splx(s); 2137 } 2138 /* See if permanently promiscuous mode bit is about to flip */ 2139 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2140 if (new_flags & IFF_PPROMISC) 2141 ifp->if_flags |= IFF_PROMISC; 2142 else if (ifp->if_pcount == 0) 2143 ifp->if_flags &= ~IFF_PROMISC; 2144 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2145 ifp->if_xname, 2146 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2147 } 2148 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2149 (new_flags &~ IFF_CANTCHANGE); 2150 if (ifp->if_ioctl) { 2151 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2152 } 2153 getmicrotime(&ifp->if_lastchange); 2154 break; 2155 2156 case SIOCSIFCAP: 2157 error = priv_check(td, PRIV_NET_SETIFCAP); 2158 if (error) 2159 return (error); 2160 if (ifp->if_ioctl == NULL) 2161 return (EOPNOTSUPP); 2162 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2163 return (EINVAL); 2164 error = (*ifp->if_ioctl)(ifp, cmd, data); 2165 if (error == 0) 2166 getmicrotime(&ifp->if_lastchange); 2167 break; 2168 2169 #ifdef MAC 2170 case SIOCSIFMAC: 2171 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2172 break; 2173 #endif 2174 2175 case SIOCSIFNAME: 2176 error = priv_check(td, PRIV_NET_SETIFNAME); 2177 if (error) 2178 return (error); 2179 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2180 if (error != 0) 2181 return (error); 2182 if (new_name[0] == '\0') 2183 return (EINVAL); 2184 if (ifunit(new_name) != NULL) 2185 return (EEXIST); 2186 2187 /* 2188 * XXX: Locking. Nothing else seems to lock if_flags, 2189 * and there are numerous other races with the 2190 * ifunit() checks not being atomic with namespace 2191 * changes (renames, vmoves, if_attach, etc). 2192 */ 2193 ifp->if_flags |= IFF_RENAMING; 2194 2195 /* Announce the departure of the interface. */ 2196 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2197 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2198 2199 log(LOG_INFO, "%s: changing name to '%s'\n", 2200 ifp->if_xname, new_name); 2201 2202 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2203 ifa = ifp->if_addr; 2204 IFA_LOCK(ifa); 2205 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2206 namelen = strlen(new_name); 2207 onamelen = sdl->sdl_nlen; 2208 /* 2209 * Move the address if needed. This is safe because we 2210 * allocate space for a name of length IFNAMSIZ when we 2211 * create this in if_attach(). 2212 */ 2213 if (namelen != onamelen) { 2214 bcopy(sdl->sdl_data + onamelen, 2215 sdl->sdl_data + namelen, sdl->sdl_alen); 2216 } 2217 bcopy(new_name, sdl->sdl_data, namelen); 2218 sdl->sdl_nlen = namelen; 2219 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2220 bzero(sdl->sdl_data, onamelen); 2221 while (namelen != 0) 2222 sdl->sdl_data[--namelen] = 0xff; 2223 IFA_UNLOCK(ifa); 2224 2225 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2226 /* Announce the return of the interface. */ 2227 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2228 2229 ifp->if_flags &= ~IFF_RENAMING; 2230 break; 2231 2232 #ifdef VIMAGE 2233 case SIOCSIFVNET: 2234 error = priv_check(td, PRIV_NET_SETIFVNET); 2235 if (error) 2236 return (error); 2237 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2238 break; 2239 #endif 2240 2241 case SIOCSIFMETRIC: 2242 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2243 if (error) 2244 return (error); 2245 ifp->if_metric = ifr->ifr_metric; 2246 getmicrotime(&ifp->if_lastchange); 2247 break; 2248 2249 case SIOCSIFPHYS: 2250 error = priv_check(td, PRIV_NET_SETIFPHYS); 2251 if (error) 2252 return (error); 2253 if (ifp->if_ioctl == NULL) 2254 return (EOPNOTSUPP); 2255 error = (*ifp->if_ioctl)(ifp, cmd, data); 2256 if (error == 0) 2257 getmicrotime(&ifp->if_lastchange); 2258 break; 2259 2260 case SIOCSIFMTU: 2261 { 2262 u_long oldmtu = ifp->if_mtu; 2263 2264 error = priv_check(td, PRIV_NET_SETIFMTU); 2265 if (error) 2266 return (error); 2267 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2268 return (EINVAL); 2269 if (ifp->if_ioctl == NULL) 2270 return (EOPNOTSUPP); 2271 error = (*ifp->if_ioctl)(ifp, cmd, data); 2272 if (error == 0) { 2273 getmicrotime(&ifp->if_lastchange); 2274 rt_ifmsg(ifp); 2275 } 2276 /* 2277 * If the link MTU changed, do network layer specific procedure. 2278 */ 2279 if (ifp->if_mtu != oldmtu) { 2280 #ifdef INET6 2281 nd6_setmtu(ifp); 2282 #endif 2283 } 2284 break; 2285 } 2286 2287 case SIOCADDMULTI: 2288 case SIOCDELMULTI: 2289 if (cmd == SIOCADDMULTI) 2290 error = priv_check(td, PRIV_NET_ADDMULTI); 2291 else 2292 error = priv_check(td, PRIV_NET_DELMULTI); 2293 if (error) 2294 return (error); 2295 2296 /* Don't allow group membership on non-multicast interfaces. */ 2297 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2298 return (EOPNOTSUPP); 2299 2300 /* Don't let users screw up protocols' entries. */ 2301 if (ifr->ifr_addr.sa_family != AF_LINK) 2302 return (EINVAL); 2303 2304 if (cmd == SIOCADDMULTI) { 2305 struct ifmultiaddr *ifma; 2306 2307 /* 2308 * Userland is only permitted to join groups once 2309 * via the if_addmulti() KPI, because it cannot hold 2310 * struct ifmultiaddr * between calls. It may also 2311 * lose a race while we check if the membership 2312 * already exists. 2313 */ 2314 IF_ADDR_LOCK(ifp); 2315 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2316 IF_ADDR_UNLOCK(ifp); 2317 if (ifma != NULL) 2318 error = EADDRINUSE; 2319 else 2320 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2321 } else { 2322 error = if_delmulti(ifp, &ifr->ifr_addr); 2323 } 2324 if (error == 0) 2325 getmicrotime(&ifp->if_lastchange); 2326 break; 2327 2328 case SIOCSIFPHYADDR: 2329 case SIOCDIFPHYADDR: 2330 #ifdef INET6 2331 case SIOCSIFPHYADDR_IN6: 2332 #endif 2333 case SIOCSLIFPHYADDR: 2334 case SIOCSIFMEDIA: 2335 case SIOCSIFGENERIC: 2336 error = priv_check(td, PRIV_NET_HWIOCTL); 2337 if (error) 2338 return (error); 2339 if (ifp->if_ioctl == NULL) 2340 return (EOPNOTSUPP); 2341 error = (*ifp->if_ioctl)(ifp, cmd, data); 2342 if (error == 0) 2343 getmicrotime(&ifp->if_lastchange); 2344 break; 2345 2346 case SIOCGIFSTATUS: 2347 ifs = (struct ifstat *)data; 2348 ifs->ascii[0] = '\0'; 2349 2350 case SIOCGIFPSRCADDR: 2351 case SIOCGIFPDSTADDR: 2352 case SIOCGLIFPHYADDR: 2353 case SIOCGIFMEDIA: 2354 case SIOCGIFGENERIC: 2355 if (ifp->if_ioctl == NULL) 2356 return (EOPNOTSUPP); 2357 error = (*ifp->if_ioctl)(ifp, cmd, data); 2358 break; 2359 2360 case SIOCSIFLLADDR: 2361 error = priv_check(td, PRIV_NET_SETLLADDR); 2362 if (error) 2363 return (error); 2364 error = if_setlladdr(ifp, 2365 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2366 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2367 break; 2368 2369 case SIOCAIFGROUP: 2370 { 2371 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2372 2373 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2374 if (error) 2375 return (error); 2376 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2377 return (error); 2378 break; 2379 } 2380 2381 case SIOCGIFGROUP: 2382 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2383 return (error); 2384 break; 2385 2386 case SIOCDIFGROUP: 2387 { 2388 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2389 2390 error = priv_check(td, PRIV_NET_DELIFGROUP); 2391 if (error) 2392 return (error); 2393 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2394 return (error); 2395 break; 2396 } 2397 2398 default: 2399 error = ENOIOCTL; 2400 break; 2401 } 2402 return (error); 2403 } 2404 2405 #ifdef COMPAT_FREEBSD32 2406 struct ifconf32 { 2407 int32_t ifc_len; 2408 union { 2409 uint32_t ifcu_buf; 2410 uint32_t ifcu_req; 2411 } ifc_ifcu; 2412 }; 2413 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2414 #endif 2415 2416 /* 2417 * Interface ioctls. 2418 */ 2419 int 2420 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2421 { 2422 struct ifnet *ifp; 2423 struct ifreq *ifr; 2424 int error; 2425 int oif_flags; 2426 2427 switch (cmd) { 2428 case SIOCGIFCONF: 2429 case OSIOCGIFCONF: 2430 return (ifconf(cmd, data)); 2431 2432 #ifdef COMPAT_FREEBSD32 2433 case SIOCGIFCONF32: 2434 { 2435 struct ifconf32 *ifc32; 2436 struct ifconf ifc; 2437 2438 ifc32 = (struct ifconf32 *)data; 2439 ifc.ifc_len = ifc32->ifc_len; 2440 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2441 2442 return (ifconf(SIOCGIFCONF, (void *)&ifc)); 2443 } 2444 #endif 2445 } 2446 ifr = (struct ifreq *)data; 2447 2448 switch (cmd) { 2449 #ifdef VIMAGE 2450 case SIOCSIFRVNET: 2451 error = priv_check(td, PRIV_NET_SETIFVNET); 2452 if (error) 2453 return (error); 2454 return (if_vmove_reclaim(td, ifr->ifr_name, ifr->ifr_jid)); 2455 #endif 2456 case SIOCIFCREATE: 2457 case SIOCIFCREATE2: 2458 error = priv_check(td, PRIV_NET_IFCREATE); 2459 if (error) 2460 return (error); 2461 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2462 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2463 case SIOCIFDESTROY: 2464 error = priv_check(td, PRIV_NET_IFDESTROY); 2465 if (error) 2466 return (error); 2467 return if_clone_destroy(ifr->ifr_name); 2468 2469 case SIOCIFGCLONERS: 2470 return (if_clone_list((struct if_clonereq *)data)); 2471 case SIOCGIFGMEMB: 2472 return (if_getgroupmembers((struct ifgroupreq *)data)); 2473 } 2474 2475 ifp = ifunit_ref(ifr->ifr_name); 2476 if (ifp == NULL) 2477 return (ENXIO); 2478 2479 error = ifhwioctl(cmd, ifp, data, td); 2480 if (error != ENOIOCTL) { 2481 if_rele(ifp); 2482 return (error); 2483 } 2484 2485 oif_flags = ifp->if_flags; 2486 if (so->so_proto == NULL) { 2487 if_rele(ifp); 2488 return (EOPNOTSUPP); 2489 } 2490 #ifndef COMPAT_43 2491 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2492 data, 2493 ifp, td)); 2494 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2495 error = (*ifp->if_ioctl)(ifp, cmd, data); 2496 #else 2497 { 2498 u_long ocmd = cmd; 2499 2500 switch (cmd) { 2501 2502 case SIOCSIFDSTADDR: 2503 case SIOCSIFADDR: 2504 case SIOCSIFBRDADDR: 2505 case SIOCSIFNETMASK: 2506 #if BYTE_ORDER != BIG_ENDIAN 2507 if (ifr->ifr_addr.sa_family == 0 && 2508 ifr->ifr_addr.sa_len < 16) { 2509 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2510 ifr->ifr_addr.sa_len = 16; 2511 } 2512 #else 2513 if (ifr->ifr_addr.sa_len == 0) 2514 ifr->ifr_addr.sa_len = 16; 2515 #endif 2516 break; 2517 2518 case OSIOCGIFADDR: 2519 cmd = SIOCGIFADDR; 2520 break; 2521 2522 case OSIOCGIFDSTADDR: 2523 cmd = SIOCGIFDSTADDR; 2524 break; 2525 2526 case OSIOCGIFBRDADDR: 2527 cmd = SIOCGIFBRDADDR; 2528 break; 2529 2530 case OSIOCGIFNETMASK: 2531 cmd = SIOCGIFNETMASK; 2532 } 2533 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2534 cmd, 2535 data, 2536 ifp, td)); 2537 if (error == EOPNOTSUPP && ifp != NULL && 2538 ifp->if_ioctl != NULL) 2539 error = (*ifp->if_ioctl)(ifp, cmd, data); 2540 switch (ocmd) { 2541 2542 case OSIOCGIFADDR: 2543 case OSIOCGIFDSTADDR: 2544 case OSIOCGIFBRDADDR: 2545 case OSIOCGIFNETMASK: 2546 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2547 2548 } 2549 } 2550 #endif /* COMPAT_43 */ 2551 2552 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2553 #ifdef INET6 2554 if (ifp->if_flags & IFF_UP) { 2555 int s = splimp(); 2556 in6_if_up(ifp); 2557 splx(s); 2558 } 2559 #endif 2560 } 2561 if_rele(ifp); 2562 return (error); 2563 } 2564 2565 /* 2566 * The code common to handling reference counted flags, 2567 * e.g., in ifpromisc() and if_allmulti(). 2568 * The "pflag" argument can specify a permanent mode flag to check, 2569 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2570 * 2571 * Only to be used on stack-owned flags, not driver-owned flags. 2572 */ 2573 static int 2574 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2575 { 2576 struct ifreq ifr; 2577 int error; 2578 int oldflags, oldcount; 2579 2580 /* Sanity checks to catch programming errors */ 2581 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2582 ("%s: setting driver-owned flag %d", __func__, flag)); 2583 2584 if (onswitch) 2585 KASSERT(*refcount >= 0, 2586 ("%s: increment negative refcount %d for flag %d", 2587 __func__, *refcount, flag)); 2588 else 2589 KASSERT(*refcount > 0, 2590 ("%s: decrement non-positive refcount %d for flag %d", 2591 __func__, *refcount, flag)); 2592 2593 /* In case this mode is permanent, just touch refcount */ 2594 if (ifp->if_flags & pflag) { 2595 *refcount += onswitch ? 1 : -1; 2596 return (0); 2597 } 2598 2599 /* Save ifnet parameters for if_ioctl() may fail */ 2600 oldcount = *refcount; 2601 oldflags = ifp->if_flags; 2602 2603 /* 2604 * See if we aren't the only and touching refcount is enough. 2605 * Actually toggle interface flag if we are the first or last. 2606 */ 2607 if (onswitch) { 2608 if ((*refcount)++) 2609 return (0); 2610 ifp->if_flags |= flag; 2611 } else { 2612 if (--(*refcount)) 2613 return (0); 2614 ifp->if_flags &= ~flag; 2615 } 2616 2617 /* Call down the driver since we've changed interface flags */ 2618 if (ifp->if_ioctl == NULL) { 2619 error = EOPNOTSUPP; 2620 goto recover; 2621 } 2622 ifr.ifr_flags = ifp->if_flags & 0xffff; 2623 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2624 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2625 if (error) 2626 goto recover; 2627 /* Notify userland that interface flags have changed */ 2628 rt_ifmsg(ifp); 2629 return (0); 2630 2631 recover: 2632 /* Recover after driver error */ 2633 *refcount = oldcount; 2634 ifp->if_flags = oldflags; 2635 return (error); 2636 } 2637 2638 /* 2639 * Set/clear promiscuous mode on interface ifp based on the truth value 2640 * of pswitch. The calls are reference counted so that only the first 2641 * "on" request actually has an effect, as does the final "off" request. 2642 * Results are undefined if the "off" and "on" requests are not matched. 2643 */ 2644 int 2645 ifpromisc(struct ifnet *ifp, int pswitch) 2646 { 2647 int error; 2648 int oldflags = ifp->if_flags; 2649 2650 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2651 &ifp->if_pcount, pswitch); 2652 /* If promiscuous mode status has changed, log a message */ 2653 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2654 log(LOG_INFO, "%s: promiscuous mode %s\n", 2655 ifp->if_xname, 2656 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2657 return (error); 2658 } 2659 2660 /* 2661 * Return interface configuration 2662 * of system. List may be used 2663 * in later ioctl's (above) to get 2664 * other information. 2665 */ 2666 /*ARGSUSED*/ 2667 static int 2668 ifconf(u_long cmd, caddr_t data) 2669 { 2670 struct ifconf *ifc = (struct ifconf *)data; 2671 struct ifnet *ifp; 2672 struct ifaddr *ifa; 2673 struct ifreq ifr; 2674 struct sbuf *sb; 2675 int error, full = 0, valid_len, max_len; 2676 2677 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2678 max_len = MAXPHYS - 1; 2679 2680 /* Prevent hostile input from being able to crash the system */ 2681 if (ifc->ifc_len <= 0) 2682 return (EINVAL); 2683 2684 again: 2685 if (ifc->ifc_len <= max_len) { 2686 max_len = ifc->ifc_len; 2687 full = 1; 2688 } 2689 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2690 max_len = 0; 2691 valid_len = 0; 2692 2693 IFNET_RLOCK(); 2694 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2695 int addrs; 2696 2697 /* 2698 * Zero the ifr_name buffer to make sure we don't 2699 * disclose the contents of the stack. 2700 */ 2701 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2702 2703 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2704 >= sizeof(ifr.ifr_name)) { 2705 sbuf_delete(sb); 2706 IFNET_RUNLOCK(); 2707 return (ENAMETOOLONG); 2708 } 2709 2710 addrs = 0; 2711 IF_ADDR_LOCK(ifp); 2712 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2713 struct sockaddr *sa = ifa->ifa_addr; 2714 2715 if (prison_if(curthread->td_ucred, sa) != 0) 2716 continue; 2717 addrs++; 2718 #ifdef COMPAT_43 2719 if (cmd == OSIOCGIFCONF) { 2720 struct osockaddr *osa = 2721 (struct osockaddr *)&ifr.ifr_addr; 2722 ifr.ifr_addr = *sa; 2723 osa->sa_family = sa->sa_family; 2724 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2725 max_len += sizeof(ifr); 2726 } else 2727 #endif 2728 if (sa->sa_len <= sizeof(*sa)) { 2729 ifr.ifr_addr = *sa; 2730 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2731 max_len += sizeof(ifr); 2732 } else { 2733 sbuf_bcat(sb, &ifr, 2734 offsetof(struct ifreq, ifr_addr)); 2735 max_len += offsetof(struct ifreq, ifr_addr); 2736 sbuf_bcat(sb, sa, sa->sa_len); 2737 max_len += sa->sa_len; 2738 } 2739 2740 if (sbuf_error(sb) == 0) 2741 valid_len = sbuf_len(sb); 2742 } 2743 IF_ADDR_UNLOCK(ifp); 2744 if (addrs == 0) { 2745 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2746 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2747 max_len += sizeof(ifr); 2748 2749 if (sbuf_error(sb) == 0) 2750 valid_len = sbuf_len(sb); 2751 } 2752 } 2753 IFNET_RUNLOCK(); 2754 2755 /* 2756 * If we didn't allocate enough space (uncommon), try again. If 2757 * we have already allocated as much space as we are allowed, 2758 * return what we've got. 2759 */ 2760 if (valid_len != max_len && !full) { 2761 sbuf_delete(sb); 2762 goto again; 2763 } 2764 2765 ifc->ifc_len = valid_len; 2766 sbuf_finish(sb); 2767 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2768 sbuf_delete(sb); 2769 return (error); 2770 } 2771 2772 /* 2773 * Just like ifpromisc(), but for all-multicast-reception mode. 2774 */ 2775 int 2776 if_allmulti(struct ifnet *ifp, int onswitch) 2777 { 2778 2779 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2780 } 2781 2782 struct ifmultiaddr * 2783 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2784 { 2785 struct ifmultiaddr *ifma; 2786 2787 IF_ADDR_LOCK_ASSERT(ifp); 2788 2789 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2790 if (sa->sa_family == AF_LINK) { 2791 if (sa_dl_equal(ifma->ifma_addr, sa)) 2792 break; 2793 } else { 2794 if (sa_equal(ifma->ifma_addr, sa)) 2795 break; 2796 } 2797 } 2798 2799 return ifma; 2800 } 2801 2802 /* 2803 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2804 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2805 * the ifnet multicast address list here, so the caller must do that and 2806 * other setup work (such as notifying the device driver). The reference 2807 * count is initialized to 1. 2808 */ 2809 static struct ifmultiaddr * 2810 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2811 int mflags) 2812 { 2813 struct ifmultiaddr *ifma; 2814 struct sockaddr *dupsa; 2815 2816 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2817 M_ZERO); 2818 if (ifma == NULL) 2819 return (NULL); 2820 2821 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2822 if (dupsa == NULL) { 2823 free(ifma, M_IFMADDR); 2824 return (NULL); 2825 } 2826 bcopy(sa, dupsa, sa->sa_len); 2827 ifma->ifma_addr = dupsa; 2828 2829 ifma->ifma_ifp = ifp; 2830 ifma->ifma_refcount = 1; 2831 ifma->ifma_protospec = NULL; 2832 2833 if (llsa == NULL) { 2834 ifma->ifma_lladdr = NULL; 2835 return (ifma); 2836 } 2837 2838 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2839 if (dupsa == NULL) { 2840 free(ifma->ifma_addr, M_IFMADDR); 2841 free(ifma, M_IFMADDR); 2842 return (NULL); 2843 } 2844 bcopy(llsa, dupsa, llsa->sa_len); 2845 ifma->ifma_lladdr = dupsa; 2846 2847 return (ifma); 2848 } 2849 2850 /* 2851 * if_freemulti: free ifmultiaddr structure and possibly attached related 2852 * addresses. The caller is responsible for implementing reference 2853 * counting, notifying the driver, handling routing messages, and releasing 2854 * any dependent link layer state. 2855 */ 2856 static void 2857 if_freemulti(struct ifmultiaddr *ifma) 2858 { 2859 2860 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2861 ifma->ifma_refcount)); 2862 KASSERT(ifma->ifma_protospec == NULL, 2863 ("if_freemulti: protospec not NULL")); 2864 2865 if (ifma->ifma_lladdr != NULL) 2866 free(ifma->ifma_lladdr, M_IFMADDR); 2867 free(ifma->ifma_addr, M_IFMADDR); 2868 free(ifma, M_IFMADDR); 2869 } 2870 2871 /* 2872 * Register an additional multicast address with a network interface. 2873 * 2874 * - If the address is already present, bump the reference count on the 2875 * address and return. 2876 * - If the address is not link-layer, look up a link layer address. 2877 * - Allocate address structures for one or both addresses, and attach to the 2878 * multicast address list on the interface. If automatically adding a link 2879 * layer address, the protocol address will own a reference to the link 2880 * layer address, to be freed when it is freed. 2881 * - Notify the network device driver of an addition to the multicast address 2882 * list. 2883 * 2884 * 'sa' points to caller-owned memory with the desired multicast address. 2885 * 2886 * 'retifma' will be used to return a pointer to the resulting multicast 2887 * address reference, if desired. 2888 */ 2889 int 2890 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2891 struct ifmultiaddr **retifma) 2892 { 2893 struct ifmultiaddr *ifma, *ll_ifma; 2894 struct sockaddr *llsa; 2895 int error; 2896 2897 /* 2898 * If the address is already present, return a new reference to it; 2899 * otherwise, allocate storage and set up a new address. 2900 */ 2901 IF_ADDR_LOCK(ifp); 2902 ifma = if_findmulti(ifp, sa); 2903 if (ifma != NULL) { 2904 ifma->ifma_refcount++; 2905 if (retifma != NULL) 2906 *retifma = ifma; 2907 IF_ADDR_UNLOCK(ifp); 2908 return (0); 2909 } 2910 2911 /* 2912 * The address isn't already present; resolve the protocol address 2913 * into a link layer address, and then look that up, bump its 2914 * refcount or allocate an ifma for that also. If 'llsa' was 2915 * returned, we will need to free it later. 2916 */ 2917 llsa = NULL; 2918 ll_ifma = NULL; 2919 if (ifp->if_resolvemulti != NULL) { 2920 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2921 if (error) 2922 goto unlock_out; 2923 } 2924 2925 /* 2926 * Allocate the new address. Don't hook it up yet, as we may also 2927 * need to allocate a link layer multicast address. 2928 */ 2929 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2930 if (ifma == NULL) { 2931 error = ENOMEM; 2932 goto free_llsa_out; 2933 } 2934 2935 /* 2936 * If a link layer address is found, we'll need to see if it's 2937 * already present in the address list, or allocate is as well. 2938 * When this block finishes, the link layer address will be on the 2939 * list. 2940 */ 2941 if (llsa != NULL) { 2942 ll_ifma = if_findmulti(ifp, llsa); 2943 if (ll_ifma == NULL) { 2944 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2945 if (ll_ifma == NULL) { 2946 --ifma->ifma_refcount; 2947 if_freemulti(ifma); 2948 error = ENOMEM; 2949 goto free_llsa_out; 2950 } 2951 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2952 ifma_link); 2953 } else 2954 ll_ifma->ifma_refcount++; 2955 ifma->ifma_llifma = ll_ifma; 2956 } 2957 2958 /* 2959 * We now have a new multicast address, ifma, and possibly a new or 2960 * referenced link layer address. Add the primary address to the 2961 * ifnet address list. 2962 */ 2963 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2964 2965 if (retifma != NULL) 2966 *retifma = ifma; 2967 2968 /* 2969 * Must generate the message while holding the lock so that 'ifma' 2970 * pointer is still valid. 2971 */ 2972 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2973 IF_ADDR_UNLOCK(ifp); 2974 2975 /* 2976 * We are certain we have added something, so call down to the 2977 * interface to let them know about it. 2978 */ 2979 if (ifp->if_ioctl != NULL) { 2980 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2981 } 2982 2983 if (llsa != NULL) 2984 free(llsa, M_IFMADDR); 2985 2986 return (0); 2987 2988 free_llsa_out: 2989 if (llsa != NULL) 2990 free(llsa, M_IFMADDR); 2991 2992 unlock_out: 2993 IF_ADDR_UNLOCK(ifp); 2994 return (error); 2995 } 2996 2997 /* 2998 * Delete a multicast group membership by network-layer group address. 2999 * 3000 * Returns ENOENT if the entry could not be found. If ifp no longer 3001 * exists, results are undefined. This entry point should only be used 3002 * from subsystems which do appropriate locking to hold ifp for the 3003 * duration of the call. 3004 * Network-layer protocol domains must use if_delmulti_ifma(). 3005 */ 3006 int 3007 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3008 { 3009 struct ifmultiaddr *ifma; 3010 int lastref; 3011 #ifdef INVARIANTS 3012 struct ifnet *oifp; 3013 3014 IFNET_RLOCK_NOSLEEP(); 3015 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3016 if (ifp == oifp) 3017 break; 3018 if (ifp != oifp) 3019 ifp = NULL; 3020 IFNET_RUNLOCK_NOSLEEP(); 3021 3022 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3023 #endif 3024 if (ifp == NULL) 3025 return (ENOENT); 3026 3027 IF_ADDR_LOCK(ifp); 3028 lastref = 0; 3029 ifma = if_findmulti(ifp, sa); 3030 if (ifma != NULL) 3031 lastref = if_delmulti_locked(ifp, ifma, 0); 3032 IF_ADDR_UNLOCK(ifp); 3033 3034 if (ifma == NULL) 3035 return (ENOENT); 3036 3037 if (lastref && ifp->if_ioctl != NULL) { 3038 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3039 } 3040 3041 return (0); 3042 } 3043 3044 /* 3045 * Delete all multicast group membership for an interface. 3046 * Should be used to quickly flush all multicast filters. 3047 */ 3048 void 3049 if_delallmulti(struct ifnet *ifp) 3050 { 3051 struct ifmultiaddr *ifma; 3052 struct ifmultiaddr *next; 3053 3054 IF_ADDR_LOCK(ifp); 3055 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3056 if_delmulti_locked(ifp, ifma, 0); 3057 IF_ADDR_UNLOCK(ifp); 3058 } 3059 3060 /* 3061 * Delete a multicast group membership by group membership pointer. 3062 * Network-layer protocol domains must use this routine. 3063 * 3064 * It is safe to call this routine if the ifp disappeared. 3065 */ 3066 void 3067 if_delmulti_ifma(struct ifmultiaddr *ifma) 3068 { 3069 struct ifnet *ifp; 3070 int lastref; 3071 3072 ifp = ifma->ifma_ifp; 3073 #ifdef DIAGNOSTIC 3074 if (ifp == NULL) { 3075 printf("%s: ifma_ifp seems to be detached\n", __func__); 3076 } else { 3077 struct ifnet *oifp; 3078 3079 IFNET_RLOCK_NOSLEEP(); 3080 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3081 if (ifp == oifp) 3082 break; 3083 if (ifp != oifp) { 3084 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3085 ifp = NULL; 3086 } 3087 IFNET_RUNLOCK_NOSLEEP(); 3088 } 3089 #endif 3090 /* 3091 * If and only if the ifnet instance exists: Acquire the address lock. 3092 */ 3093 if (ifp != NULL) 3094 IF_ADDR_LOCK(ifp); 3095 3096 lastref = if_delmulti_locked(ifp, ifma, 0); 3097 3098 if (ifp != NULL) { 3099 /* 3100 * If and only if the ifnet instance exists: 3101 * Release the address lock. 3102 * If the group was left: update the hardware hash filter. 3103 */ 3104 IF_ADDR_UNLOCK(ifp); 3105 if (lastref && ifp->if_ioctl != NULL) { 3106 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3107 } 3108 } 3109 } 3110 3111 /* 3112 * Perform deletion of network-layer and/or link-layer multicast address. 3113 * 3114 * Return 0 if the reference count was decremented. 3115 * Return 1 if the final reference was released, indicating that the 3116 * hardware hash filter should be reprogrammed. 3117 */ 3118 static int 3119 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3120 { 3121 struct ifmultiaddr *ll_ifma; 3122 3123 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3124 KASSERT(ifma->ifma_ifp == ifp, 3125 ("%s: inconsistent ifp %p", __func__, ifp)); 3126 IF_ADDR_LOCK_ASSERT(ifp); 3127 } 3128 3129 ifp = ifma->ifma_ifp; 3130 3131 /* 3132 * If the ifnet is detaching, null out references to ifnet, 3133 * so that upper protocol layers will notice, and not attempt 3134 * to obtain locks for an ifnet which no longer exists. The 3135 * routing socket announcement must happen before the ifnet 3136 * instance is detached from the system. 3137 */ 3138 if (detaching) { 3139 #ifdef DIAGNOSTIC 3140 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3141 #endif 3142 /* 3143 * ifp may already be nulled out if we are being reentered 3144 * to delete the ll_ifma. 3145 */ 3146 if (ifp != NULL) { 3147 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3148 ifma->ifma_ifp = NULL; 3149 } 3150 } 3151 3152 if (--ifma->ifma_refcount > 0) 3153 return 0; 3154 3155 /* 3156 * If this ifma is a network-layer ifma, a link-layer ifma may 3157 * have been associated with it. Release it first if so. 3158 */ 3159 ll_ifma = ifma->ifma_llifma; 3160 if (ll_ifma != NULL) { 3161 KASSERT(ifma->ifma_lladdr != NULL, 3162 ("%s: llifma w/o lladdr", __func__)); 3163 if (detaching) 3164 ll_ifma->ifma_ifp = NULL; /* XXX */ 3165 if (--ll_ifma->ifma_refcount == 0) { 3166 if (ifp != NULL) { 3167 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3168 ifma_link); 3169 } 3170 if_freemulti(ll_ifma); 3171 } 3172 } 3173 3174 if (ifp != NULL) 3175 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3176 3177 if_freemulti(ifma); 3178 3179 /* 3180 * The last reference to this instance of struct ifmultiaddr 3181 * was released; the hardware should be notified of this change. 3182 */ 3183 return 1; 3184 } 3185 3186 /* 3187 * Set the link layer address on an interface. 3188 * 3189 * At this time we only support certain types of interfaces, 3190 * and we don't allow the length of the address to change. 3191 */ 3192 int 3193 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3194 { 3195 struct sockaddr_dl *sdl; 3196 struct ifaddr *ifa; 3197 struct ifreq ifr; 3198 3199 IF_ADDR_LOCK(ifp); 3200 ifa = ifp->if_addr; 3201 if (ifa == NULL) { 3202 IF_ADDR_UNLOCK(ifp); 3203 return (EINVAL); 3204 } 3205 ifa_ref(ifa); 3206 IF_ADDR_UNLOCK(ifp); 3207 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3208 if (sdl == NULL) { 3209 ifa_free(ifa); 3210 return (EINVAL); 3211 } 3212 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3213 ifa_free(ifa); 3214 return (EINVAL); 3215 } 3216 switch (ifp->if_type) { 3217 case IFT_ETHER: 3218 case IFT_FDDI: 3219 case IFT_XETHER: 3220 case IFT_ISO88025: 3221 case IFT_L2VLAN: 3222 case IFT_BRIDGE: 3223 case IFT_ARCNET: 3224 case IFT_IEEE8023ADLAG: 3225 case IFT_IEEE80211: 3226 bcopy(lladdr, LLADDR(sdl), len); 3227 ifa_free(ifa); 3228 break; 3229 default: 3230 ifa_free(ifa); 3231 return (ENODEV); 3232 } 3233 3234 /* 3235 * If the interface is already up, we need 3236 * to re-init it in order to reprogram its 3237 * address filter. 3238 */ 3239 if ((ifp->if_flags & IFF_UP) != 0) { 3240 if (ifp->if_ioctl) { 3241 ifp->if_flags &= ~IFF_UP; 3242 ifr.ifr_flags = ifp->if_flags & 0xffff; 3243 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3244 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3245 ifp->if_flags |= IFF_UP; 3246 ifr.ifr_flags = ifp->if_flags & 0xffff; 3247 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3248 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3249 } 3250 #ifdef INET 3251 /* 3252 * Also send gratuitous ARPs to notify other nodes about 3253 * the address change. 3254 */ 3255 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3256 if (ifa->ifa_addr->sa_family == AF_INET) 3257 arp_ifinit(ifp, ifa); 3258 } 3259 #endif 3260 } 3261 return (0); 3262 } 3263 3264 /* 3265 * The name argument must be a pointer to storage which will last as 3266 * long as the interface does. For physical devices, the result of 3267 * device_get_name(dev) is a good choice and for pseudo-devices a 3268 * static string works well. 3269 */ 3270 void 3271 if_initname(struct ifnet *ifp, const char *name, int unit) 3272 { 3273 ifp->if_dname = name; 3274 ifp->if_dunit = unit; 3275 if (unit != IF_DUNIT_NONE) 3276 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3277 else 3278 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3279 } 3280 3281 int 3282 if_printf(struct ifnet *ifp, const char * fmt, ...) 3283 { 3284 va_list ap; 3285 int retval; 3286 3287 retval = printf("%s: ", ifp->if_xname); 3288 va_start(ap, fmt); 3289 retval += vprintf(fmt, ap); 3290 va_end(ap); 3291 return (retval); 3292 } 3293 3294 void 3295 if_start(struct ifnet *ifp) 3296 { 3297 3298 (*(ifp)->if_start)(ifp); 3299 } 3300 3301 /* 3302 * Backwards compatibility interface for drivers 3303 * that have not implemented it 3304 */ 3305 static int 3306 if_transmit(struct ifnet *ifp, struct mbuf *m) 3307 { 3308 int error; 3309 3310 IFQ_HANDOFF(ifp, m, error); 3311 return (error); 3312 } 3313 3314 int 3315 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3316 { 3317 int active = 0; 3318 3319 IF_LOCK(ifq); 3320 if (_IF_QFULL(ifq)) { 3321 _IF_DROP(ifq); 3322 IF_UNLOCK(ifq); 3323 m_freem(m); 3324 return (0); 3325 } 3326 if (ifp != NULL) { 3327 ifp->if_obytes += m->m_pkthdr.len + adjust; 3328 if (m->m_flags & (M_BCAST|M_MCAST)) 3329 ifp->if_omcasts++; 3330 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3331 } 3332 _IF_ENQUEUE(ifq, m); 3333 IF_UNLOCK(ifq); 3334 if (ifp != NULL && !active) 3335 (*(ifp)->if_start)(ifp); 3336 return (1); 3337 } 3338 3339 void 3340 if_register_com_alloc(u_char type, 3341 if_com_alloc_t *a, if_com_free_t *f) 3342 { 3343 3344 KASSERT(if_com_alloc[type] == NULL, 3345 ("if_register_com_alloc: %d already registered", type)); 3346 KASSERT(if_com_free[type] == NULL, 3347 ("if_register_com_alloc: %d free already registered", type)); 3348 3349 if_com_alloc[type] = a; 3350 if_com_free[type] = f; 3351 } 3352 3353 void 3354 if_deregister_com_alloc(u_char type) 3355 { 3356 3357 KASSERT(if_com_alloc[type] != NULL, 3358 ("if_deregister_com_alloc: %d not registered", type)); 3359 KASSERT(if_com_free[type] != NULL, 3360 ("if_deregister_com_alloc: %d free not registered", type)); 3361 if_com_alloc[type] = NULL; 3362 if_com_free[type] = NULL; 3363 } 3364