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_INT(_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 retry: 270 /* 271 * Try to find an empty slot below V_if_index. If we fail, take the 272 * next slot. 273 */ 274 for (idx = 1; idx <= V_if_index; idx++) { 275 if (V_ifindex_table[idx].ife_ifnet == NULL) 276 break; 277 } 278 279 /* Catch if_index overflow. */ 280 if (idx < 1) 281 return (ENOSPC); 282 if (idx >= V_if_indexlim) { 283 if_grow(); 284 goto retry; 285 } 286 if (idx > V_if_index) 287 V_if_index = idx; 288 *idxp = idx; 289 return (0); 290 } 291 292 static void 293 ifindex_free_locked(u_short idx) 294 { 295 296 IFNET_WLOCK_ASSERT(); 297 298 V_ifindex_table[idx].ife_ifnet = NULL; 299 while (V_if_index > 0 && 300 V_ifindex_table[V_if_index].ife_ifnet == NULL) 301 V_if_index--; 302 } 303 304 static void 305 ifindex_free(u_short idx) 306 { 307 308 IFNET_WLOCK(); 309 ifindex_free_locked(idx); 310 IFNET_WUNLOCK(); 311 } 312 313 static void 314 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 315 { 316 317 IFNET_WLOCK_ASSERT(); 318 319 V_ifindex_table[idx].ife_ifnet = ifp; 320 } 321 322 static void 323 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 324 { 325 326 IFNET_WLOCK(); 327 ifnet_setbyindex_locked(idx, ifp); 328 IFNET_WUNLOCK(); 329 } 330 331 struct ifaddr * 332 ifaddr_byindex(u_short idx) 333 { 334 struct ifaddr *ifa; 335 336 IFNET_RLOCK_NOSLEEP(); 337 ifa = ifnet_byindex_locked(idx)->if_addr; 338 if (ifa != NULL) 339 ifa_ref(ifa); 340 IFNET_RUNLOCK_NOSLEEP(); 341 return (ifa); 342 } 343 344 /* 345 * Network interface utility routines. 346 * 347 * Routines with ifa_ifwith* names take sockaddr *'s as 348 * parameters. 349 */ 350 351 static void 352 vnet_if_init(const void *unused __unused) 353 { 354 355 TAILQ_INIT(&V_ifnet); 356 TAILQ_INIT(&V_ifg_head); 357 IFNET_WLOCK(); 358 if_grow(); /* create initial table */ 359 IFNET_WUNLOCK(); 360 vnet_if_clone_init(); 361 } 362 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 363 NULL); 364 365 /* ARGSUSED*/ 366 static void 367 if_init(void *dummy __unused) 368 { 369 370 IFNET_LOCK_INIT(); 371 if_clone_init(); 372 } 373 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 374 375 376 #ifdef VIMAGE 377 static void 378 vnet_if_uninit(const void *unused __unused) 379 { 380 381 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet)); 382 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head)); 383 384 free((caddr_t)V_ifindex_table, M_IFNET); 385 } 386 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 387 vnet_if_uninit, NULL); 388 #endif 389 390 static void 391 if_grow(void) 392 { 393 int oldlim; 394 u_int n; 395 struct ifindex_entry *e; 396 397 IFNET_WLOCK_ASSERT(); 398 oldlim = V_if_indexlim; 399 IFNET_WUNLOCK(); 400 n = (oldlim << 1) * sizeof(*e); 401 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 402 IFNET_WLOCK(); 403 if (V_if_indexlim != oldlim) { 404 free(e, M_IFNET); 405 return; 406 } 407 if (V_ifindex_table != NULL) { 408 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 409 free((caddr_t)V_ifindex_table, M_IFNET); 410 } 411 V_if_indexlim <<= 1; 412 V_ifindex_table = e; 413 } 414 415 /* 416 * Allocate a struct ifnet and an index for an interface. A layer 2 417 * common structure will also be allocated if an allocation routine is 418 * registered for the passed type. 419 */ 420 struct ifnet * 421 if_alloc(u_char type) 422 { 423 struct ifnet *ifp; 424 u_short idx; 425 426 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 427 IFNET_WLOCK(); 428 if (ifindex_alloc_locked(&idx) != 0) { 429 IFNET_WUNLOCK(); 430 free(ifp, M_IFNET); 431 return (NULL); 432 } 433 ifnet_setbyindex_locked(idx, IFNET_HOLD); 434 IFNET_WUNLOCK(); 435 ifp->if_index = idx; 436 ifp->if_type = type; 437 ifp->if_alloctype = type; 438 if (if_com_alloc[type] != NULL) { 439 ifp->if_l2com = if_com_alloc[type](type, ifp); 440 if (ifp->if_l2com == NULL) { 441 free(ifp, M_IFNET); 442 ifindex_free(idx); 443 return (NULL); 444 } 445 } 446 447 IF_ADDR_LOCK_INIT(ifp); 448 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 449 ifp->if_afdata_initialized = 0; 450 IF_AFDATA_LOCK_INIT(ifp); 451 TAILQ_INIT(&ifp->if_addrhead); 452 TAILQ_INIT(&ifp->if_prefixhead); 453 TAILQ_INIT(&ifp->if_multiaddrs); 454 TAILQ_INIT(&ifp->if_groups); 455 #ifdef MAC 456 mac_ifnet_init(ifp); 457 #endif 458 ifq_init(&ifp->if_snd, ifp); 459 460 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 461 ifnet_setbyindex(ifp->if_index, ifp); 462 return (ifp); 463 } 464 465 /* 466 * Do the actual work of freeing a struct ifnet, associated index, and layer 467 * 2 common structure. This call is made when the last reference to an 468 * interface is released. 469 */ 470 static void 471 if_free_internal(struct ifnet *ifp) 472 { 473 474 KASSERT((ifp->if_flags & IFF_DYING), 475 ("if_free_internal: interface not dying")); 476 477 IFNET_WLOCK(); 478 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 479 ("%s: freeing unallocated ifnet", ifp->if_xname)); 480 481 ifindex_free_locked(ifp->if_index); 482 IFNET_WUNLOCK(); 483 484 if (if_com_free[ifp->if_alloctype] != NULL) 485 if_com_free[ifp->if_alloctype](ifp->if_l2com, 486 ifp->if_alloctype); 487 488 #ifdef MAC 489 mac_ifnet_destroy(ifp); 490 #endif /* MAC */ 491 if (ifp->if_description != NULL) 492 free(ifp->if_description, M_IFDESCR); 493 IF_AFDATA_DESTROY(ifp); 494 IF_ADDR_LOCK_DESTROY(ifp); 495 ifq_delete(&ifp->if_snd); 496 free(ifp, M_IFNET); 497 } 498 499 /* 500 * This version should only be called by intefaces that switch their type 501 * after calling if_alloc(). if_free_type() will go away again now that we 502 * have if_alloctype to cache the original allocation type. For now, assert 503 * that they match, since we require that in practice. 504 */ 505 void 506 if_free_type(struct ifnet *ifp, u_char type) 507 { 508 509 KASSERT(ifp->if_alloctype == type, 510 ("if_free_type: type (%d) != alloctype (%d)", type, 511 ifp->if_alloctype)); 512 513 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 514 if (!refcount_release(&ifp->if_refcount)) 515 return; 516 if_free_internal(ifp); 517 } 518 519 /* 520 * This is the normal version of if_free(), used by device drivers to free a 521 * detached network interface. The contents of if_free_type() will move into 522 * here when if_free_type() goes away. 523 */ 524 void 525 if_free(struct ifnet *ifp) 526 { 527 528 if_free_type(ifp, ifp->if_alloctype); 529 } 530 531 /* 532 * Interfaces to keep an ifnet type-stable despite the possibility of the 533 * driver calling if_free(). If there are additional references, we defer 534 * freeing the underlying data structure. 535 */ 536 void 537 if_ref(struct ifnet *ifp) 538 { 539 540 /* We don't assert the ifnet list lock here, but arguably should. */ 541 refcount_acquire(&ifp->if_refcount); 542 } 543 544 void 545 if_rele(struct ifnet *ifp) 546 { 547 548 if (!refcount_release(&ifp->if_refcount)) 549 return; 550 if_free_internal(ifp); 551 } 552 553 void 554 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 555 { 556 557 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 558 559 if (ifq->ifq_maxlen == 0) 560 ifq->ifq_maxlen = ifqmaxlen; 561 562 ifq->altq_type = 0; 563 ifq->altq_disc = NULL; 564 ifq->altq_flags &= ALTQF_CANTCHANGE; 565 ifq->altq_tbr = NULL; 566 ifq->altq_ifp = ifp; 567 } 568 569 void 570 ifq_delete(struct ifaltq *ifq) 571 { 572 mtx_destroy(&ifq->ifq_mtx); 573 } 574 575 /* 576 * Perform generic interface initalization tasks and attach the interface 577 * to the list of "active" interfaces. If vmove flag is set on entry 578 * to if_attach_internal(), perform only a limited subset of initialization 579 * tasks, given that we are moving from one vnet to another an ifnet which 580 * has already been fully initialized. 581 * 582 * XXX: 583 * - The decision to return void and thus require this function to 584 * succeed is questionable. 585 * - We should probably do more sanity checking. For instance we don't 586 * do anything to insure if_xname is unique or non-empty. 587 */ 588 void 589 if_attach(struct ifnet *ifp) 590 { 591 592 if_attach_internal(ifp, 0); 593 } 594 595 static void 596 if_attach_internal(struct ifnet *ifp, int vmove) 597 { 598 unsigned socksize, ifasize; 599 int namelen, masklen; 600 struct sockaddr_dl *sdl; 601 struct ifaddr *ifa; 602 603 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 604 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 605 ifp->if_xname); 606 607 #ifdef VIMAGE 608 ifp->if_vnet = curvnet; 609 if (ifp->if_home_vnet == NULL) 610 ifp->if_home_vnet = curvnet; 611 #endif 612 613 if_addgroup(ifp, IFG_ALL); 614 615 getmicrotime(&ifp->if_lastchange); 616 ifp->if_data.ifi_epoch = time_uptime; 617 ifp->if_data.ifi_datalen = sizeof(struct if_data); 618 619 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 620 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 621 ("transmit and qflush must both either be set or both be NULL")); 622 if (ifp->if_transmit == NULL) { 623 ifp->if_transmit = if_transmit; 624 ifp->if_qflush = if_qflush; 625 } 626 627 if (!vmove) { 628 #ifdef MAC 629 mac_ifnet_create(ifp); 630 #endif 631 632 /* 633 * Create a Link Level name for this device. 634 */ 635 namelen = strlen(ifp->if_xname); 636 /* 637 * Always save enough space for any possiable name so we 638 * can do a rename in place later. 639 */ 640 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 641 socksize = masklen + ifp->if_addrlen; 642 if (socksize < sizeof(*sdl)) 643 socksize = sizeof(*sdl); 644 socksize = roundup2(socksize, sizeof(long)); 645 ifasize = sizeof(*ifa) + 2 * socksize; 646 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 647 ifa_init(ifa); 648 sdl = (struct sockaddr_dl *)(ifa + 1); 649 sdl->sdl_len = socksize; 650 sdl->sdl_family = AF_LINK; 651 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 652 sdl->sdl_nlen = namelen; 653 sdl->sdl_index = ifp->if_index; 654 sdl->sdl_type = ifp->if_type; 655 ifp->if_addr = ifa; 656 ifa->ifa_ifp = ifp; 657 ifa->ifa_rtrequest = link_rtrequest; 658 ifa->ifa_addr = (struct sockaddr *)sdl; 659 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 660 ifa->ifa_netmask = (struct sockaddr *)sdl; 661 sdl->sdl_len = masklen; 662 while (namelen != 0) 663 sdl->sdl_data[--namelen] = 0xff; 664 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 665 /* Reliably crash if used uninitialized. */ 666 ifp->if_broadcastaddr = NULL; 667 } 668 #ifdef VIMAGE 669 else { 670 /* 671 * Update the interface index in the link layer address 672 * of the interface. 673 */ 674 for (ifa = ifp->if_addr; ifa != NULL; 675 ifa = TAILQ_NEXT(ifa, ifa_link)) { 676 if (ifa->ifa_addr->sa_family == AF_LINK) { 677 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 678 sdl->sdl_index = ifp->if_index; 679 } 680 } 681 } 682 #endif 683 684 IFNET_WLOCK(); 685 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 686 #ifdef VIMAGE 687 curvnet->vnet_ifcnt++; 688 #endif 689 IFNET_WUNLOCK(); 690 691 if (domain_init_status >= 2) 692 if_attachdomain1(ifp); 693 694 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 695 if (IS_DEFAULT_VNET(curvnet)) 696 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 697 698 /* Announce the interface. */ 699 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 700 } 701 702 static void 703 if_attachdomain(void *dummy) 704 { 705 struct ifnet *ifp; 706 int s; 707 708 s = splnet(); 709 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 710 if_attachdomain1(ifp); 711 splx(s); 712 } 713 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 714 if_attachdomain, NULL); 715 716 static void 717 if_attachdomain1(struct ifnet *ifp) 718 { 719 struct domain *dp; 720 int s; 721 722 s = splnet(); 723 724 /* 725 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 726 * cannot lock ifp->if_afdata initialization, entirely. 727 */ 728 if (IF_AFDATA_TRYLOCK(ifp) == 0) { 729 splx(s); 730 return; 731 } 732 if (ifp->if_afdata_initialized >= domain_init_status) { 733 IF_AFDATA_UNLOCK(ifp); 734 splx(s); 735 printf("if_attachdomain called more than once on %s\n", 736 ifp->if_xname); 737 return; 738 } 739 ifp->if_afdata_initialized = domain_init_status; 740 IF_AFDATA_UNLOCK(ifp); 741 742 /* address family dependent data region */ 743 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 744 for (dp = domains; dp; dp = dp->dom_next) { 745 if (dp->dom_ifattach) 746 ifp->if_afdata[dp->dom_family] = 747 (*dp->dom_ifattach)(ifp); 748 } 749 750 splx(s); 751 } 752 753 /* 754 * Remove any unicast or broadcast network addresses from an interface. 755 */ 756 void 757 if_purgeaddrs(struct ifnet *ifp) 758 { 759 struct ifaddr *ifa, *next; 760 761 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 762 if (ifa->ifa_addr->sa_family == AF_LINK) 763 continue; 764 #ifdef INET 765 /* XXX: Ugly!! ad hoc just for INET */ 766 if (ifa->ifa_addr->sa_family == AF_INET) { 767 struct ifaliasreq ifr; 768 769 bzero(&ifr, sizeof(ifr)); 770 ifr.ifra_addr = *ifa->ifa_addr; 771 if (ifa->ifa_dstaddr) 772 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 773 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 774 NULL) == 0) 775 continue; 776 } 777 #endif /* INET */ 778 #ifdef INET6 779 if (ifa->ifa_addr->sa_family == AF_INET6) { 780 in6_purgeaddr(ifa); 781 /* ifp_addrhead is already updated */ 782 continue; 783 } 784 #endif /* INET6 */ 785 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 786 ifa_free(ifa); 787 } 788 } 789 790 /* 791 * Remove any multicast network addresses from an interface when an ifnet 792 * is going away. 793 */ 794 static void 795 if_purgemaddrs(struct ifnet *ifp) 796 { 797 struct ifmultiaddr *ifma; 798 struct ifmultiaddr *next; 799 800 IF_ADDR_LOCK(ifp); 801 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 802 if_delmulti_locked(ifp, ifma, 1); 803 IF_ADDR_UNLOCK(ifp); 804 } 805 806 /* 807 * Detach an interface, removing it from the list of "active" interfaces. 808 * If vmove flag is set on entry to if_detach_internal(), perform only a 809 * limited subset of cleanup tasks, given that we are moving an ifnet from 810 * one vnet to another, where it must be fully operational. 811 * 812 * XXXRW: There are some significant questions about event ordering, and 813 * how to prevent things from starting to use the interface during detach. 814 */ 815 void 816 if_detach(struct ifnet *ifp) 817 { 818 819 if_detach_internal(ifp, 0); 820 } 821 822 static void 823 if_detach_internal(struct ifnet *ifp, int vmove) 824 { 825 struct ifaddr *ifa; 826 struct radix_node_head *rnh; 827 int i, j; 828 struct domain *dp; 829 struct ifnet *iter; 830 int found = 0; 831 832 IFNET_WLOCK(); 833 TAILQ_FOREACH(iter, &V_ifnet, if_link) 834 if (iter == ifp) { 835 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 836 found = 1; 837 break; 838 } 839 #ifdef VIMAGE 840 if (found) 841 curvnet->vnet_ifcnt--; 842 #endif 843 IFNET_WUNLOCK(); 844 if (!found) { 845 if (vmove) 846 panic("%s: ifp=%p not on the ifnet tailq %p", 847 __func__, ifp, &V_ifnet); 848 else 849 return; /* XXX this should panic as well? */ 850 } 851 852 /* 853 * Remove/wait for pending events. 854 */ 855 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 856 857 /* 858 * Remove routes and flush queues. 859 */ 860 if_down(ifp); 861 #ifdef ALTQ 862 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 863 altq_disable(&ifp->if_snd); 864 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 865 altq_detach(&ifp->if_snd); 866 #endif 867 868 if_purgeaddrs(ifp); 869 870 #ifdef INET 871 in_ifdetach(ifp); 872 #endif 873 874 #ifdef INET6 875 /* 876 * Remove all IPv6 kernel structs related to ifp. This should be done 877 * before removing routing entries below, since IPv6 interface direct 878 * routes are expected to be removed by the IPv6-specific kernel API. 879 * Otherwise, the kernel will detect some inconsistency and bark it. 880 */ 881 in6_ifdetach(ifp); 882 #endif 883 if_purgemaddrs(ifp); 884 885 if (!vmove) { 886 /* 887 * Prevent further calls into the device driver via ifnet. 888 */ 889 if_dead(ifp); 890 891 /* 892 * Remove link ifaddr pointer and maybe decrement if_index. 893 * Clean up all addresses. 894 */ 895 ifp->if_addr = NULL; 896 897 /* We can now free link ifaddr. */ 898 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 899 ifa = TAILQ_FIRST(&ifp->if_addrhead); 900 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 901 ifa_free(ifa); 902 } 903 } 904 905 /* 906 * Delete all remaining routes using this interface 907 * Unfortuneatly the only way to do this is to slog through 908 * the entire routing table looking for routes which point 909 * to this interface...oh well... 910 */ 911 for (i = 1; i <= AF_MAX; i++) { 912 for (j = 0; j < rt_numfibs; j++) { 913 rnh = rt_tables_get_rnh(j, i); 914 if (rnh == NULL) 915 continue; 916 RADIX_NODE_HEAD_LOCK(rnh); 917 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 918 RADIX_NODE_HEAD_UNLOCK(rnh); 919 } 920 } 921 922 /* Announce that the interface is gone. */ 923 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 924 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 925 if (IS_DEFAULT_VNET(curvnet)) 926 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 927 if_delgroups(ifp); 928 929 /* 930 * We cannot hold the lock over dom_ifdetach calls as they might 931 * sleep, for example trying to drain a callout, thus open up the 932 * theoretical race with re-attaching. 933 */ 934 IF_AFDATA_LOCK(ifp); 935 i = ifp->if_afdata_initialized; 936 ifp->if_afdata_initialized = 0; 937 IF_AFDATA_UNLOCK(ifp); 938 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 939 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 940 (*dp->dom_ifdetach)(ifp, 941 ifp->if_afdata[dp->dom_family]); 942 } 943 } 944 945 #ifdef VIMAGE 946 /* 947 * if_vmove() performs a limited version of if_detach() in current 948 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 949 * An attempt is made to shrink if_index in current vnet, find an 950 * unused if_index in target vnet and calls if_grow() if necessary, 951 * and finally find an unused if_xname for the target vnet. 952 */ 953 void 954 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 955 { 956 u_short idx; 957 958 /* 959 * Detach from current vnet, but preserve LLADDR info, do not 960 * mark as dead etc. so that the ifnet can be reattached later. 961 */ 962 if_detach_internal(ifp, 1); 963 964 /* 965 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 966 * the if_index for that vnet if possible. 967 * 968 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 969 * or we'd lock on one vnet and unlock on another. 970 */ 971 IFNET_WLOCK(); 972 ifindex_free_locked(ifp->if_index); 973 IFNET_WUNLOCK(); 974 975 /* 976 * Perform interface-specific reassignment tasks, if provided by 977 * the driver. 978 */ 979 if (ifp->if_reassign != NULL) 980 ifp->if_reassign(ifp, new_vnet, NULL); 981 982 /* 983 * Switch to the context of the target vnet. 984 */ 985 CURVNET_SET_QUIET(new_vnet); 986 987 IFNET_WLOCK(); 988 if (ifindex_alloc_locked(&idx) != 0) { 989 IFNET_WUNLOCK(); 990 panic("if_index overflow"); 991 } 992 ifp->if_index = idx; 993 ifnet_setbyindex_locked(ifp->if_index, ifp); 994 IFNET_WUNLOCK(); 995 996 if_attach_internal(ifp, 1); 997 998 CURVNET_RESTORE(); 999 } 1000 1001 /* 1002 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1003 */ 1004 static int 1005 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1006 { 1007 struct prison *pr; 1008 struct ifnet *difp; 1009 1010 /* Try to find the prison within our visibility. */ 1011 sx_slock(&allprison_lock); 1012 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1013 sx_sunlock(&allprison_lock); 1014 if (pr == NULL) 1015 return (ENXIO); 1016 prison_hold_locked(pr); 1017 mtx_unlock(&pr->pr_mtx); 1018 1019 /* Do not try to move the iface from and to the same prison. */ 1020 if (pr->pr_vnet == ifp->if_vnet) { 1021 prison_free(pr); 1022 return (EEXIST); 1023 } 1024 1025 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1026 /* XXX Lock interfaces to avoid races. */ 1027 CURVNET_SET_QUIET(pr->pr_vnet); 1028 difp = ifunit(ifname); 1029 CURVNET_RESTORE(); 1030 if (difp != NULL) { 1031 prison_free(pr); 1032 return (EEXIST); 1033 } 1034 1035 /* Move the interface into the child jail/vnet. */ 1036 if_vmove(ifp, pr->pr_vnet); 1037 1038 /* Report the new if_xname back to the userland. */ 1039 sprintf(ifname, "%s", ifp->if_xname); 1040 1041 prison_free(pr); 1042 return (0); 1043 } 1044 1045 static int 1046 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1047 { 1048 struct prison *pr; 1049 struct vnet *vnet_dst; 1050 struct ifnet *ifp; 1051 1052 /* Try to find the prison within our visibility. */ 1053 sx_slock(&allprison_lock); 1054 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1055 sx_sunlock(&allprison_lock); 1056 if (pr == NULL) 1057 return (ENXIO); 1058 prison_hold_locked(pr); 1059 mtx_unlock(&pr->pr_mtx); 1060 1061 /* Make sure the named iface exists in the source prison/vnet. */ 1062 CURVNET_SET(pr->pr_vnet); 1063 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1064 if (ifp == NULL) { 1065 CURVNET_RESTORE(); 1066 prison_free(pr); 1067 return (ENXIO); 1068 } 1069 1070 /* Do not try to move the iface from and to the same prison. */ 1071 vnet_dst = TD_TO_VNET(td); 1072 if (vnet_dst == ifp->if_vnet) { 1073 CURVNET_RESTORE(); 1074 prison_free(pr); 1075 return (EEXIST); 1076 } 1077 1078 /* Get interface back from child jail/vnet. */ 1079 if_vmove(ifp, vnet_dst); 1080 CURVNET_RESTORE(); 1081 1082 /* Report the new if_xname back to the userland. */ 1083 sprintf(ifname, "%s", ifp->if_xname); 1084 1085 prison_free(pr); 1086 return (0); 1087 } 1088 #endif /* VIMAGE */ 1089 1090 /* 1091 * Add a group to an interface 1092 */ 1093 int 1094 if_addgroup(struct ifnet *ifp, const char *groupname) 1095 { 1096 struct ifg_list *ifgl; 1097 struct ifg_group *ifg = NULL; 1098 struct ifg_member *ifgm; 1099 1100 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1101 groupname[strlen(groupname) - 1] <= '9') 1102 return (EINVAL); 1103 1104 IFNET_WLOCK(); 1105 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1106 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1107 IFNET_WUNLOCK(); 1108 return (EEXIST); 1109 } 1110 1111 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1112 M_NOWAIT)) == NULL) { 1113 IFNET_WUNLOCK(); 1114 return (ENOMEM); 1115 } 1116 1117 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1118 M_TEMP, M_NOWAIT)) == NULL) { 1119 free(ifgl, M_TEMP); 1120 IFNET_WUNLOCK(); 1121 return (ENOMEM); 1122 } 1123 1124 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1125 if (!strcmp(ifg->ifg_group, groupname)) 1126 break; 1127 1128 if (ifg == NULL) { 1129 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1130 M_TEMP, M_NOWAIT)) == NULL) { 1131 free(ifgl, M_TEMP); 1132 free(ifgm, M_TEMP); 1133 IFNET_WUNLOCK(); 1134 return (ENOMEM); 1135 } 1136 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1137 ifg->ifg_refcnt = 0; 1138 TAILQ_INIT(&ifg->ifg_members); 1139 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1140 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1141 } 1142 1143 ifg->ifg_refcnt++; 1144 ifgl->ifgl_group = ifg; 1145 ifgm->ifgm_ifp = ifp; 1146 1147 IF_ADDR_LOCK(ifp); 1148 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1149 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1150 IF_ADDR_UNLOCK(ifp); 1151 1152 IFNET_WUNLOCK(); 1153 1154 EVENTHANDLER_INVOKE(group_change_event, groupname); 1155 1156 return (0); 1157 } 1158 1159 /* 1160 * Remove a group from an interface 1161 */ 1162 int 1163 if_delgroup(struct ifnet *ifp, const char *groupname) 1164 { 1165 struct ifg_list *ifgl; 1166 struct ifg_member *ifgm; 1167 1168 IFNET_WLOCK(); 1169 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1170 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1171 break; 1172 if (ifgl == NULL) { 1173 IFNET_WUNLOCK(); 1174 return (ENOENT); 1175 } 1176 1177 IF_ADDR_LOCK(ifp); 1178 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1179 IF_ADDR_UNLOCK(ifp); 1180 1181 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1182 if (ifgm->ifgm_ifp == ifp) 1183 break; 1184 1185 if (ifgm != NULL) { 1186 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1187 free(ifgm, M_TEMP); 1188 } 1189 1190 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1191 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1192 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1193 free(ifgl->ifgl_group, M_TEMP); 1194 } 1195 IFNET_WUNLOCK(); 1196 1197 free(ifgl, M_TEMP); 1198 1199 EVENTHANDLER_INVOKE(group_change_event, groupname); 1200 1201 return (0); 1202 } 1203 1204 /* 1205 * Remove an interface from all groups 1206 */ 1207 static void 1208 if_delgroups(struct ifnet *ifp) 1209 { 1210 struct ifg_list *ifgl; 1211 struct ifg_member *ifgm; 1212 char groupname[IFNAMSIZ]; 1213 1214 IFNET_WLOCK(); 1215 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1216 ifgl = TAILQ_FIRST(&ifp->if_groups); 1217 1218 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1219 1220 IF_ADDR_LOCK(ifp); 1221 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1222 IF_ADDR_UNLOCK(ifp); 1223 1224 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1225 if (ifgm->ifgm_ifp == ifp) 1226 break; 1227 1228 if (ifgm != NULL) { 1229 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1230 ifgm_next); 1231 free(ifgm, M_TEMP); 1232 } 1233 1234 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1235 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1236 EVENTHANDLER_INVOKE(group_detach_event, 1237 ifgl->ifgl_group); 1238 free(ifgl->ifgl_group, M_TEMP); 1239 } 1240 IFNET_WUNLOCK(); 1241 1242 free(ifgl, M_TEMP); 1243 1244 EVENTHANDLER_INVOKE(group_change_event, groupname); 1245 1246 IFNET_WLOCK(); 1247 } 1248 IFNET_WUNLOCK(); 1249 } 1250 1251 /* 1252 * Stores all groups from an interface in memory pointed 1253 * to by data 1254 */ 1255 static int 1256 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1257 { 1258 int len, error; 1259 struct ifg_list *ifgl; 1260 struct ifg_req ifgrq, *ifgp; 1261 struct ifgroupreq *ifgr = data; 1262 1263 if (ifgr->ifgr_len == 0) { 1264 IF_ADDR_LOCK(ifp); 1265 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1266 ifgr->ifgr_len += sizeof(struct ifg_req); 1267 IF_ADDR_UNLOCK(ifp); 1268 return (0); 1269 } 1270 1271 len = ifgr->ifgr_len; 1272 ifgp = ifgr->ifgr_groups; 1273 /* XXX: wire */ 1274 IF_ADDR_LOCK(ifp); 1275 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1276 if (len < sizeof(ifgrq)) { 1277 IF_ADDR_UNLOCK(ifp); 1278 return (EINVAL); 1279 } 1280 bzero(&ifgrq, sizeof ifgrq); 1281 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1282 sizeof(ifgrq.ifgrq_group)); 1283 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1284 IF_ADDR_UNLOCK(ifp); 1285 return (error); 1286 } 1287 len -= sizeof(ifgrq); 1288 ifgp++; 1289 } 1290 IF_ADDR_UNLOCK(ifp); 1291 1292 return (0); 1293 } 1294 1295 /* 1296 * Stores all members of a group in memory pointed to by data 1297 */ 1298 static int 1299 if_getgroupmembers(struct ifgroupreq *data) 1300 { 1301 struct ifgroupreq *ifgr = data; 1302 struct ifg_group *ifg; 1303 struct ifg_member *ifgm; 1304 struct ifg_req ifgrq, *ifgp; 1305 int len, error; 1306 1307 IFNET_RLOCK(); 1308 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1309 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1310 break; 1311 if (ifg == NULL) { 1312 IFNET_RUNLOCK(); 1313 return (ENOENT); 1314 } 1315 1316 if (ifgr->ifgr_len == 0) { 1317 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1318 ifgr->ifgr_len += sizeof(ifgrq); 1319 IFNET_RUNLOCK(); 1320 return (0); 1321 } 1322 1323 len = ifgr->ifgr_len; 1324 ifgp = ifgr->ifgr_groups; 1325 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1326 if (len < sizeof(ifgrq)) { 1327 IFNET_RUNLOCK(); 1328 return (EINVAL); 1329 } 1330 bzero(&ifgrq, sizeof ifgrq); 1331 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1332 sizeof(ifgrq.ifgrq_member)); 1333 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1334 IFNET_RUNLOCK(); 1335 return (error); 1336 } 1337 len -= sizeof(ifgrq); 1338 ifgp++; 1339 } 1340 IFNET_RUNLOCK(); 1341 1342 return (0); 1343 } 1344 1345 /* 1346 * Delete Routes for a Network Interface 1347 * 1348 * Called for each routing entry via the rnh->rnh_walktree() call above 1349 * to delete all route entries referencing a detaching network interface. 1350 * 1351 * Arguments: 1352 * rn pointer to node in the routing table 1353 * arg argument passed to rnh->rnh_walktree() - detaching interface 1354 * 1355 * Returns: 1356 * 0 successful 1357 * errno failed - reason indicated 1358 * 1359 */ 1360 static int 1361 if_rtdel(struct radix_node *rn, void *arg) 1362 { 1363 struct rtentry *rt = (struct rtentry *)rn; 1364 struct ifnet *ifp = arg; 1365 int err; 1366 1367 if (rt->rt_ifp == ifp) { 1368 1369 /* 1370 * Protect (sorta) against walktree recursion problems 1371 * with cloned routes 1372 */ 1373 if ((rt->rt_flags & RTF_UP) == 0) 1374 return (0); 1375 1376 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1377 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1378 (struct rtentry **) NULL, rt->rt_fibnum); 1379 if (err) { 1380 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1381 } 1382 } 1383 1384 return (0); 1385 } 1386 1387 /* 1388 * Wrapper functions for struct ifnet address list locking macros. These are 1389 * used by kernel modules to avoid encoding programming interface or binary 1390 * interface assumptions that may be violated when kernel-internal locking 1391 * approaches change. 1392 */ 1393 void 1394 if_addr_rlock(struct ifnet *ifp) 1395 { 1396 1397 IF_ADDR_LOCK(ifp); 1398 } 1399 1400 void 1401 if_addr_runlock(struct ifnet *ifp) 1402 { 1403 1404 IF_ADDR_UNLOCK(ifp); 1405 } 1406 1407 void 1408 if_maddr_rlock(struct ifnet *ifp) 1409 { 1410 1411 IF_ADDR_LOCK(ifp); 1412 } 1413 1414 void 1415 if_maddr_runlock(struct ifnet *ifp) 1416 { 1417 1418 IF_ADDR_UNLOCK(ifp); 1419 } 1420 1421 /* 1422 * Reference count functions for ifaddrs. 1423 */ 1424 void 1425 ifa_init(struct ifaddr *ifa) 1426 { 1427 1428 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1429 refcount_init(&ifa->ifa_refcnt, 1); 1430 } 1431 1432 void 1433 ifa_ref(struct ifaddr *ifa) 1434 { 1435 1436 refcount_acquire(&ifa->ifa_refcnt); 1437 } 1438 1439 void 1440 ifa_free(struct ifaddr *ifa) 1441 { 1442 1443 if (refcount_release(&ifa->ifa_refcnt)) { 1444 mtx_destroy(&ifa->ifa_mtx); 1445 free(ifa, M_IFADDR); 1446 } 1447 } 1448 1449 int 1450 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1451 { 1452 int error = 0; 1453 struct rtentry *rt = NULL; 1454 struct rt_addrinfo info; 1455 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1456 1457 bzero(&info, sizeof(info)); 1458 info.rti_ifp = V_loif; 1459 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1460 info.rti_info[RTAX_DST] = ia; 1461 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1462 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1463 1464 if (error == 0 && rt != NULL) { 1465 RT_LOCK(rt); 1466 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1467 ifa->ifa_ifp->if_type; 1468 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1469 ifa->ifa_ifp->if_index; 1470 RT_REMREF(rt); 1471 RT_UNLOCK(rt); 1472 } else if (error != 0) 1473 log(LOG_INFO, "ifa_add_loopback_route: insertion failed\n"); 1474 1475 return (error); 1476 } 1477 1478 int 1479 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1480 { 1481 int error = 0; 1482 struct rt_addrinfo info; 1483 struct sockaddr_dl null_sdl; 1484 1485 bzero(&null_sdl, sizeof(null_sdl)); 1486 null_sdl.sdl_len = sizeof(null_sdl); 1487 null_sdl.sdl_family = AF_LINK; 1488 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1489 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1490 bzero(&info, sizeof(info)); 1491 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1492 info.rti_info[RTAX_DST] = ia; 1493 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1494 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1495 1496 if (error != 0) 1497 log(LOG_INFO, "ifa_del_loopback_route: deletion failed\n"); 1498 1499 return (error); 1500 } 1501 1502 /* 1503 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1504 * structs used to represent other address families, it is necessary 1505 * to perform a different comparison. 1506 */ 1507 1508 #define sa_equal(a1, a2) \ 1509 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1510 1511 #define sa_dl_equal(a1, a2) \ 1512 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1513 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1514 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1515 LLADDR((struct sockaddr_dl *)(a2)), \ 1516 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1517 1518 /* 1519 * Locate an interface based on a complete address. 1520 */ 1521 /*ARGSUSED*/ 1522 static struct ifaddr * 1523 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1524 { 1525 struct ifnet *ifp; 1526 struct ifaddr *ifa; 1527 1528 IFNET_RLOCK_NOSLEEP(); 1529 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1530 IF_ADDR_LOCK(ifp); 1531 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1532 if (ifa->ifa_addr->sa_family != addr->sa_family) 1533 continue; 1534 if (sa_equal(addr, ifa->ifa_addr)) { 1535 if (getref) 1536 ifa_ref(ifa); 1537 IF_ADDR_UNLOCK(ifp); 1538 goto done; 1539 } 1540 /* IP6 doesn't have broadcast */ 1541 if ((ifp->if_flags & IFF_BROADCAST) && 1542 ifa->ifa_broadaddr && 1543 ifa->ifa_broadaddr->sa_len != 0 && 1544 sa_equal(ifa->ifa_broadaddr, addr)) { 1545 if (getref) 1546 ifa_ref(ifa); 1547 IF_ADDR_UNLOCK(ifp); 1548 goto done; 1549 } 1550 } 1551 IF_ADDR_UNLOCK(ifp); 1552 } 1553 ifa = NULL; 1554 done: 1555 IFNET_RUNLOCK_NOSLEEP(); 1556 return (ifa); 1557 } 1558 1559 struct ifaddr * 1560 ifa_ifwithaddr(struct sockaddr *addr) 1561 { 1562 1563 return (ifa_ifwithaddr_internal(addr, 1)); 1564 } 1565 1566 int 1567 ifa_ifwithaddr_check(struct sockaddr *addr) 1568 { 1569 1570 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1571 } 1572 1573 /* 1574 * Locate an interface based on the broadcast address. 1575 */ 1576 /* ARGSUSED */ 1577 struct ifaddr * 1578 ifa_ifwithbroadaddr(struct sockaddr *addr) 1579 { 1580 struct ifnet *ifp; 1581 struct ifaddr *ifa; 1582 1583 IFNET_RLOCK_NOSLEEP(); 1584 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1585 IF_ADDR_LOCK(ifp); 1586 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1587 if (ifa->ifa_addr->sa_family != addr->sa_family) 1588 continue; 1589 if ((ifp->if_flags & IFF_BROADCAST) && 1590 ifa->ifa_broadaddr && 1591 ifa->ifa_broadaddr->sa_len != 0 && 1592 sa_equal(ifa->ifa_broadaddr, addr)) { 1593 ifa_ref(ifa); 1594 IF_ADDR_UNLOCK(ifp); 1595 goto done; 1596 } 1597 } 1598 IF_ADDR_UNLOCK(ifp); 1599 } 1600 ifa = NULL; 1601 done: 1602 IFNET_RUNLOCK_NOSLEEP(); 1603 return (ifa); 1604 } 1605 1606 /* 1607 * Locate the point to point interface with a given destination address. 1608 */ 1609 /*ARGSUSED*/ 1610 struct ifaddr * 1611 ifa_ifwithdstaddr(struct sockaddr *addr) 1612 { 1613 struct ifnet *ifp; 1614 struct ifaddr *ifa; 1615 1616 IFNET_RLOCK_NOSLEEP(); 1617 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1618 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1619 continue; 1620 IF_ADDR_LOCK(ifp); 1621 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1622 if (ifa->ifa_addr->sa_family != addr->sa_family) 1623 continue; 1624 if (ifa->ifa_dstaddr != NULL && 1625 sa_equal(addr, ifa->ifa_dstaddr)) { 1626 ifa_ref(ifa); 1627 IF_ADDR_UNLOCK(ifp); 1628 goto done; 1629 } 1630 } 1631 IF_ADDR_UNLOCK(ifp); 1632 } 1633 ifa = NULL; 1634 done: 1635 IFNET_RUNLOCK_NOSLEEP(); 1636 return (ifa); 1637 } 1638 1639 /* 1640 * Find an interface on a specific network. If many, choice 1641 * is most specific found. 1642 */ 1643 struct ifaddr * 1644 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1645 { 1646 struct ifnet *ifp; 1647 struct ifaddr *ifa; 1648 struct ifaddr *ifa_maybe = NULL; 1649 u_int af = addr->sa_family; 1650 char *addr_data = addr->sa_data, *cplim; 1651 1652 /* 1653 * AF_LINK addresses can be looked up directly by their index number, 1654 * so do that if we can. 1655 */ 1656 if (af == AF_LINK) { 1657 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1658 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1659 return (ifaddr_byindex(sdl->sdl_index)); 1660 } 1661 1662 /* 1663 * Scan though each interface, looking for ones that have addresses 1664 * in this address family. Maintain a reference on ifa_maybe once 1665 * we find one, as we release the IF_ADDR_LOCK() that kept it stable 1666 * when we move onto the next interface. 1667 */ 1668 IFNET_RLOCK_NOSLEEP(); 1669 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1670 IF_ADDR_LOCK(ifp); 1671 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1672 char *cp, *cp2, *cp3; 1673 1674 if (ifa->ifa_addr->sa_family != af) 1675 next: continue; 1676 if (af == AF_INET && 1677 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1678 /* 1679 * This is a bit broken as it doesn't 1680 * take into account that the remote end may 1681 * be a single node in the network we are 1682 * looking for. 1683 * The trouble is that we don't know the 1684 * netmask for the remote end. 1685 */ 1686 if (ifa->ifa_dstaddr != NULL && 1687 sa_equal(addr, ifa->ifa_dstaddr)) { 1688 ifa_ref(ifa); 1689 IF_ADDR_UNLOCK(ifp); 1690 goto done; 1691 } 1692 } else { 1693 /* 1694 * if we have a special address handler, 1695 * then use it instead of the generic one. 1696 */ 1697 if (ifa->ifa_claim_addr) { 1698 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1699 ifa_ref(ifa); 1700 IF_ADDR_UNLOCK(ifp); 1701 goto done; 1702 } 1703 continue; 1704 } 1705 1706 /* 1707 * Scan all the bits in the ifa's address. 1708 * If a bit dissagrees with what we are 1709 * looking for, mask it with the netmask 1710 * to see if it really matters. 1711 * (A byte at a time) 1712 */ 1713 if (ifa->ifa_netmask == 0) 1714 continue; 1715 cp = addr_data; 1716 cp2 = ifa->ifa_addr->sa_data; 1717 cp3 = ifa->ifa_netmask->sa_data; 1718 cplim = ifa->ifa_netmask->sa_len 1719 + (char *)ifa->ifa_netmask; 1720 while (cp3 < cplim) 1721 if ((*cp++ ^ *cp2++) & *cp3++) 1722 goto next; /* next address! */ 1723 /* 1724 * If the netmask of what we just found 1725 * is more specific than what we had before 1726 * (if we had one) then remember the new one 1727 * before continuing to search 1728 * for an even better one. 1729 */ 1730 if (ifa_maybe == NULL || 1731 rn_refines((caddr_t)ifa->ifa_netmask, 1732 (caddr_t)ifa_maybe->ifa_netmask)) { 1733 if (ifa_maybe != NULL) 1734 ifa_free(ifa_maybe); 1735 ifa_maybe = ifa; 1736 ifa_ref(ifa_maybe); 1737 } 1738 } 1739 } 1740 IF_ADDR_UNLOCK(ifp); 1741 } 1742 ifa = ifa_maybe; 1743 ifa_maybe = NULL; 1744 done: 1745 IFNET_RUNLOCK_NOSLEEP(); 1746 if (ifa_maybe != NULL) 1747 ifa_free(ifa_maybe); 1748 return (ifa); 1749 } 1750 1751 /* 1752 * Find an interface address specific to an interface best matching 1753 * a given address. 1754 */ 1755 struct ifaddr * 1756 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1757 { 1758 struct ifaddr *ifa; 1759 char *cp, *cp2, *cp3; 1760 char *cplim; 1761 struct ifaddr *ifa_maybe = NULL; 1762 u_int af = addr->sa_family; 1763 1764 if (af >= AF_MAX) 1765 return (NULL); 1766 IF_ADDR_LOCK(ifp); 1767 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1768 if (ifa->ifa_addr->sa_family != af) 1769 continue; 1770 if (ifa_maybe == NULL) 1771 ifa_maybe = ifa; 1772 if (ifa->ifa_netmask == 0) { 1773 if (sa_equal(addr, ifa->ifa_addr) || 1774 (ifa->ifa_dstaddr && 1775 sa_equal(addr, ifa->ifa_dstaddr))) 1776 goto done; 1777 continue; 1778 } 1779 if (ifp->if_flags & IFF_POINTOPOINT) { 1780 if (sa_equal(addr, ifa->ifa_dstaddr)) 1781 goto done; 1782 } else { 1783 cp = addr->sa_data; 1784 cp2 = ifa->ifa_addr->sa_data; 1785 cp3 = ifa->ifa_netmask->sa_data; 1786 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1787 for (; cp3 < cplim; cp3++) 1788 if ((*cp++ ^ *cp2++) & *cp3) 1789 break; 1790 if (cp3 == cplim) 1791 goto done; 1792 } 1793 } 1794 ifa = ifa_maybe; 1795 done: 1796 if (ifa != NULL) 1797 ifa_ref(ifa); 1798 IF_ADDR_UNLOCK(ifp); 1799 return (ifa); 1800 } 1801 1802 #include <net/if_llatbl.h> 1803 1804 /* 1805 * Default action when installing a route with a Link Level gateway. 1806 * Lookup an appropriate real ifa to point to. 1807 * This should be moved to /sys/net/link.c eventually. 1808 */ 1809 static void 1810 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1811 { 1812 struct ifaddr *ifa, *oifa; 1813 struct sockaddr *dst; 1814 struct ifnet *ifp; 1815 1816 RT_LOCK_ASSERT(rt); 1817 1818 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1819 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1820 return; 1821 ifa = ifaof_ifpforaddr(dst, ifp); 1822 if (ifa) { 1823 oifa = rt->rt_ifa; 1824 rt->rt_ifa = ifa; 1825 ifa_free(oifa); 1826 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1827 ifa->ifa_rtrequest(cmd, rt, info); 1828 } 1829 } 1830 1831 /* 1832 * Mark an interface down and notify protocols of 1833 * the transition. 1834 * NOTE: must be called at splnet or eqivalent. 1835 */ 1836 static void 1837 if_unroute(struct ifnet *ifp, int flag, int fam) 1838 { 1839 struct ifaddr *ifa; 1840 1841 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1842 1843 ifp->if_flags &= ~flag; 1844 getmicrotime(&ifp->if_lastchange); 1845 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1846 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1847 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1848 ifp->if_qflush(ifp); 1849 1850 if (ifp->if_carp) 1851 (*carp_linkstate_p)(ifp); 1852 rt_ifmsg(ifp); 1853 } 1854 1855 /* 1856 * Mark an interface up and notify protocols of 1857 * the transition. 1858 * NOTE: must be called at splnet or eqivalent. 1859 */ 1860 static void 1861 if_route(struct ifnet *ifp, int flag, int fam) 1862 { 1863 struct ifaddr *ifa; 1864 1865 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1866 1867 ifp->if_flags |= flag; 1868 getmicrotime(&ifp->if_lastchange); 1869 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1870 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1871 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1872 if (ifp->if_carp) 1873 (*carp_linkstate_p)(ifp); 1874 rt_ifmsg(ifp); 1875 #ifdef INET6 1876 in6_if_up(ifp); 1877 #endif 1878 } 1879 1880 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1881 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1882 1883 /* 1884 * Handle a change in the interface link state. To avoid LORs 1885 * between driver lock and upper layer locks, as well as possible 1886 * recursions, we post event to taskqueue, and all job 1887 * is done in static do_link_state_change(). 1888 */ 1889 void 1890 if_link_state_change(struct ifnet *ifp, int link_state) 1891 { 1892 /* Return if state hasn't changed. */ 1893 if (ifp->if_link_state == link_state) 1894 return; 1895 1896 ifp->if_link_state = link_state; 1897 1898 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1899 } 1900 1901 static void 1902 do_link_state_change(void *arg, int pending) 1903 { 1904 struct ifnet *ifp = (struct ifnet *)arg; 1905 int link_state = ifp->if_link_state; 1906 CURVNET_SET(ifp->if_vnet); 1907 1908 /* Notify that the link state has changed. */ 1909 rt_ifmsg(ifp); 1910 if (ifp->if_vlantrunk != NULL) 1911 (*vlan_link_state_p)(ifp); 1912 1913 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1914 IFP2AC(ifp)->ac_netgraph != NULL) 1915 (*ng_ether_link_state_p)(ifp, link_state); 1916 if (ifp->if_carp) 1917 (*carp_linkstate_p)(ifp); 1918 if (ifp->if_bridge) { 1919 KASSERT(bstp_linkstate_p != NULL,("if_bridge bstp not loaded!")); 1920 (*bstp_linkstate_p)(ifp, link_state); 1921 } 1922 if (ifp->if_lagg) { 1923 KASSERT(lagg_linkstate_p != NULL,("if_lagg not loaded!")); 1924 (*lagg_linkstate_p)(ifp, link_state); 1925 } 1926 1927 if (IS_DEFAULT_VNET(curvnet)) 1928 devctl_notify("IFNET", ifp->if_xname, 1929 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1930 NULL); 1931 if (pending > 1) 1932 if_printf(ifp, "%d link states coalesced\n", pending); 1933 if (log_link_state_change) 1934 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1935 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1936 CURVNET_RESTORE(); 1937 } 1938 1939 /* 1940 * Mark an interface down and notify protocols of 1941 * the transition. 1942 * NOTE: must be called at splnet or eqivalent. 1943 */ 1944 void 1945 if_down(struct ifnet *ifp) 1946 { 1947 1948 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1949 } 1950 1951 /* 1952 * Mark an interface up and notify protocols of 1953 * the transition. 1954 * NOTE: must be called at splnet or eqivalent. 1955 */ 1956 void 1957 if_up(struct ifnet *ifp) 1958 { 1959 1960 if_route(ifp, IFF_UP, AF_UNSPEC); 1961 } 1962 1963 /* 1964 * Flush an interface queue. 1965 */ 1966 void 1967 if_qflush(struct ifnet *ifp) 1968 { 1969 struct mbuf *m, *n; 1970 struct ifaltq *ifq; 1971 1972 ifq = &ifp->if_snd; 1973 IFQ_LOCK(ifq); 1974 #ifdef ALTQ 1975 if (ALTQ_IS_ENABLED(ifq)) 1976 ALTQ_PURGE(ifq); 1977 #endif 1978 n = ifq->ifq_head; 1979 while ((m = n) != 0) { 1980 n = m->m_act; 1981 m_freem(m); 1982 } 1983 ifq->ifq_head = 0; 1984 ifq->ifq_tail = 0; 1985 ifq->ifq_len = 0; 1986 IFQ_UNLOCK(ifq); 1987 } 1988 1989 /* 1990 * Map interface name to interface structure pointer, with or without 1991 * returning a reference. 1992 */ 1993 struct ifnet * 1994 ifunit_ref(const char *name) 1995 { 1996 struct ifnet *ifp; 1997 1998 IFNET_RLOCK_NOSLEEP(); 1999 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2000 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2001 !(ifp->if_flags & IFF_DYING)) 2002 break; 2003 } 2004 if (ifp != NULL) 2005 if_ref(ifp); 2006 IFNET_RUNLOCK_NOSLEEP(); 2007 return (ifp); 2008 } 2009 2010 struct ifnet * 2011 ifunit(const char *name) 2012 { 2013 struct ifnet *ifp; 2014 2015 IFNET_RLOCK_NOSLEEP(); 2016 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2017 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2018 break; 2019 } 2020 IFNET_RUNLOCK_NOSLEEP(); 2021 return (ifp); 2022 } 2023 2024 /* 2025 * Hardware specific interface ioctls. 2026 */ 2027 static int 2028 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2029 { 2030 struct ifreq *ifr; 2031 struct ifstat *ifs; 2032 int error = 0; 2033 int new_flags, temp_flags; 2034 size_t namelen, onamelen; 2035 size_t descrlen; 2036 char *descrbuf, *odescrbuf; 2037 char new_name[IFNAMSIZ]; 2038 struct ifaddr *ifa; 2039 struct sockaddr_dl *sdl; 2040 2041 ifr = (struct ifreq *)data; 2042 switch (cmd) { 2043 case SIOCGIFINDEX: 2044 ifr->ifr_index = ifp->if_index; 2045 break; 2046 2047 case SIOCGIFFLAGS: 2048 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2049 ifr->ifr_flags = temp_flags & 0xffff; 2050 ifr->ifr_flagshigh = temp_flags >> 16; 2051 break; 2052 2053 case SIOCGIFCAP: 2054 ifr->ifr_reqcap = ifp->if_capabilities; 2055 ifr->ifr_curcap = ifp->if_capenable; 2056 break; 2057 2058 #ifdef MAC 2059 case SIOCGIFMAC: 2060 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2061 break; 2062 #endif 2063 2064 case SIOCGIFMETRIC: 2065 ifr->ifr_metric = ifp->if_metric; 2066 break; 2067 2068 case SIOCGIFMTU: 2069 ifr->ifr_mtu = ifp->if_mtu; 2070 break; 2071 2072 case SIOCGIFPHYS: 2073 ifr->ifr_phys = ifp->if_physical; 2074 break; 2075 2076 case SIOCGIFDESCR: 2077 error = 0; 2078 sx_slock(&ifdescr_sx); 2079 if (ifp->if_description == NULL) 2080 error = ENOMSG; 2081 else { 2082 /* space for terminating nul */ 2083 descrlen = strlen(ifp->if_description) + 1; 2084 if (ifr->ifr_buffer.length < descrlen) 2085 ifr->ifr_buffer.buffer = NULL; 2086 else 2087 error = copyout(ifp->if_description, 2088 ifr->ifr_buffer.buffer, descrlen); 2089 ifr->ifr_buffer.length = descrlen; 2090 } 2091 sx_sunlock(&ifdescr_sx); 2092 break; 2093 2094 case SIOCSIFDESCR: 2095 error = priv_check(td, PRIV_NET_SETIFDESCR); 2096 if (error) 2097 return (error); 2098 2099 /* 2100 * Copy only (length-1) bytes to make sure that 2101 * if_description is always nul terminated. The 2102 * length parameter is supposed to count the 2103 * terminating nul in. 2104 */ 2105 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2106 return (ENAMETOOLONG); 2107 else if (ifr->ifr_buffer.length == 0) 2108 descrbuf = NULL; 2109 else { 2110 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2111 M_WAITOK | M_ZERO); 2112 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2113 ifr->ifr_buffer.length - 1); 2114 if (error) { 2115 free(descrbuf, M_IFDESCR); 2116 break; 2117 } 2118 } 2119 2120 sx_xlock(&ifdescr_sx); 2121 odescrbuf = ifp->if_description; 2122 ifp->if_description = descrbuf; 2123 sx_xunlock(&ifdescr_sx); 2124 2125 getmicrotime(&ifp->if_lastchange); 2126 free(odescrbuf, M_IFDESCR); 2127 break; 2128 2129 case SIOCSIFFLAGS: 2130 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2131 if (error) 2132 return (error); 2133 /* 2134 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2135 * check, so we don't need special handling here yet. 2136 */ 2137 new_flags = (ifr->ifr_flags & 0xffff) | 2138 (ifr->ifr_flagshigh << 16); 2139 if (ifp->if_flags & IFF_SMART) { 2140 /* Smart drivers twiddle their own routes */ 2141 } else if (ifp->if_flags & IFF_UP && 2142 (new_flags & IFF_UP) == 0) { 2143 int s = splimp(); 2144 if_down(ifp); 2145 splx(s); 2146 } else if (new_flags & IFF_UP && 2147 (ifp->if_flags & IFF_UP) == 0) { 2148 int s = splimp(); 2149 if_up(ifp); 2150 splx(s); 2151 } 2152 /* See if permanently promiscuous mode bit is about to flip */ 2153 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2154 if (new_flags & IFF_PPROMISC) 2155 ifp->if_flags |= IFF_PROMISC; 2156 else if (ifp->if_pcount == 0) 2157 ifp->if_flags &= ~IFF_PROMISC; 2158 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2159 ifp->if_xname, 2160 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2161 } 2162 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2163 (new_flags &~ IFF_CANTCHANGE); 2164 if (ifp->if_ioctl) { 2165 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2166 } 2167 getmicrotime(&ifp->if_lastchange); 2168 break; 2169 2170 case SIOCSIFCAP: 2171 error = priv_check(td, PRIV_NET_SETIFCAP); 2172 if (error) 2173 return (error); 2174 if (ifp->if_ioctl == NULL) 2175 return (EOPNOTSUPP); 2176 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2177 return (EINVAL); 2178 error = (*ifp->if_ioctl)(ifp, cmd, data); 2179 if (error == 0) 2180 getmicrotime(&ifp->if_lastchange); 2181 break; 2182 2183 #ifdef MAC 2184 case SIOCSIFMAC: 2185 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2186 break; 2187 #endif 2188 2189 case SIOCSIFNAME: 2190 error = priv_check(td, PRIV_NET_SETIFNAME); 2191 if (error) 2192 return (error); 2193 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2194 if (error != 0) 2195 return (error); 2196 if (new_name[0] == '\0') 2197 return (EINVAL); 2198 if (ifunit(new_name) != NULL) 2199 return (EEXIST); 2200 2201 /* 2202 * XXX: Locking. Nothing else seems to lock if_flags, 2203 * and there are numerous other races with the 2204 * ifunit() checks not being atomic with namespace 2205 * changes (renames, vmoves, if_attach, etc). 2206 */ 2207 ifp->if_flags |= IFF_RENAMING; 2208 2209 /* Announce the departure of the interface. */ 2210 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2211 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2212 2213 log(LOG_INFO, "%s: changing name to '%s'\n", 2214 ifp->if_xname, new_name); 2215 2216 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2217 ifa = ifp->if_addr; 2218 IFA_LOCK(ifa); 2219 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2220 namelen = strlen(new_name); 2221 onamelen = sdl->sdl_nlen; 2222 /* 2223 * Move the address if needed. This is safe because we 2224 * allocate space for a name of length IFNAMSIZ when we 2225 * create this in if_attach(). 2226 */ 2227 if (namelen != onamelen) { 2228 bcopy(sdl->sdl_data + onamelen, 2229 sdl->sdl_data + namelen, sdl->sdl_alen); 2230 } 2231 bcopy(new_name, sdl->sdl_data, namelen); 2232 sdl->sdl_nlen = namelen; 2233 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2234 bzero(sdl->sdl_data, onamelen); 2235 while (namelen != 0) 2236 sdl->sdl_data[--namelen] = 0xff; 2237 IFA_UNLOCK(ifa); 2238 2239 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2240 /* Announce the return of the interface. */ 2241 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2242 2243 ifp->if_flags &= ~IFF_RENAMING; 2244 break; 2245 2246 #ifdef VIMAGE 2247 case SIOCSIFVNET: 2248 error = priv_check(td, PRIV_NET_SETIFVNET); 2249 if (error) 2250 return (error); 2251 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2252 break; 2253 #endif 2254 2255 case SIOCSIFMETRIC: 2256 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2257 if (error) 2258 return (error); 2259 ifp->if_metric = ifr->ifr_metric; 2260 getmicrotime(&ifp->if_lastchange); 2261 break; 2262 2263 case SIOCSIFPHYS: 2264 error = priv_check(td, PRIV_NET_SETIFPHYS); 2265 if (error) 2266 return (error); 2267 if (ifp->if_ioctl == NULL) 2268 return (EOPNOTSUPP); 2269 error = (*ifp->if_ioctl)(ifp, cmd, data); 2270 if (error == 0) 2271 getmicrotime(&ifp->if_lastchange); 2272 break; 2273 2274 case SIOCSIFMTU: 2275 { 2276 u_long oldmtu = ifp->if_mtu; 2277 2278 error = priv_check(td, PRIV_NET_SETIFMTU); 2279 if (error) 2280 return (error); 2281 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2282 return (EINVAL); 2283 if (ifp->if_ioctl == NULL) 2284 return (EOPNOTSUPP); 2285 error = (*ifp->if_ioctl)(ifp, cmd, data); 2286 if (error == 0) { 2287 getmicrotime(&ifp->if_lastchange); 2288 rt_ifmsg(ifp); 2289 } 2290 /* 2291 * If the link MTU changed, do network layer specific procedure. 2292 */ 2293 if (ifp->if_mtu != oldmtu) { 2294 #ifdef INET6 2295 nd6_setmtu(ifp); 2296 #endif 2297 } 2298 break; 2299 } 2300 2301 case SIOCADDMULTI: 2302 case SIOCDELMULTI: 2303 if (cmd == SIOCADDMULTI) 2304 error = priv_check(td, PRIV_NET_ADDMULTI); 2305 else 2306 error = priv_check(td, PRIV_NET_DELMULTI); 2307 if (error) 2308 return (error); 2309 2310 /* Don't allow group membership on non-multicast interfaces. */ 2311 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2312 return (EOPNOTSUPP); 2313 2314 /* Don't let users screw up protocols' entries. */ 2315 if (ifr->ifr_addr.sa_family != AF_LINK) 2316 return (EINVAL); 2317 2318 if (cmd == SIOCADDMULTI) { 2319 struct ifmultiaddr *ifma; 2320 2321 /* 2322 * Userland is only permitted to join groups once 2323 * via the if_addmulti() KPI, because it cannot hold 2324 * struct ifmultiaddr * between calls. It may also 2325 * lose a race while we check if the membership 2326 * already exists. 2327 */ 2328 IF_ADDR_LOCK(ifp); 2329 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2330 IF_ADDR_UNLOCK(ifp); 2331 if (ifma != NULL) 2332 error = EADDRINUSE; 2333 else 2334 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2335 } else { 2336 error = if_delmulti(ifp, &ifr->ifr_addr); 2337 } 2338 if (error == 0) 2339 getmicrotime(&ifp->if_lastchange); 2340 break; 2341 2342 case SIOCSIFPHYADDR: 2343 case SIOCDIFPHYADDR: 2344 #ifdef INET6 2345 case SIOCSIFPHYADDR_IN6: 2346 #endif 2347 case SIOCSLIFPHYADDR: 2348 case SIOCSIFMEDIA: 2349 case SIOCSIFGENERIC: 2350 error = priv_check(td, PRIV_NET_HWIOCTL); 2351 if (error) 2352 return (error); 2353 if (ifp->if_ioctl == NULL) 2354 return (EOPNOTSUPP); 2355 error = (*ifp->if_ioctl)(ifp, cmd, data); 2356 if (error == 0) 2357 getmicrotime(&ifp->if_lastchange); 2358 break; 2359 2360 case SIOCGIFSTATUS: 2361 ifs = (struct ifstat *)data; 2362 ifs->ascii[0] = '\0'; 2363 2364 case SIOCGIFPSRCADDR: 2365 case SIOCGIFPDSTADDR: 2366 case SIOCGLIFPHYADDR: 2367 case SIOCGIFMEDIA: 2368 case SIOCGIFGENERIC: 2369 if (ifp->if_ioctl == NULL) 2370 return (EOPNOTSUPP); 2371 error = (*ifp->if_ioctl)(ifp, cmd, data); 2372 break; 2373 2374 case SIOCSIFLLADDR: 2375 error = priv_check(td, PRIV_NET_SETLLADDR); 2376 if (error) 2377 return (error); 2378 error = if_setlladdr(ifp, 2379 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2380 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2381 break; 2382 2383 case SIOCAIFGROUP: 2384 { 2385 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2386 2387 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2388 if (error) 2389 return (error); 2390 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2391 return (error); 2392 break; 2393 } 2394 2395 case SIOCGIFGROUP: 2396 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2397 return (error); 2398 break; 2399 2400 case SIOCDIFGROUP: 2401 { 2402 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2403 2404 error = priv_check(td, PRIV_NET_DELIFGROUP); 2405 if (error) 2406 return (error); 2407 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2408 return (error); 2409 break; 2410 } 2411 2412 default: 2413 error = ENOIOCTL; 2414 break; 2415 } 2416 return (error); 2417 } 2418 2419 #ifdef COMPAT_FREEBSD32 2420 struct ifconf32 { 2421 int32_t ifc_len; 2422 union { 2423 uint32_t ifcu_buf; 2424 uint32_t ifcu_req; 2425 } ifc_ifcu; 2426 }; 2427 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2428 #endif 2429 2430 /* 2431 * Interface ioctls. 2432 */ 2433 int 2434 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2435 { 2436 struct ifnet *ifp; 2437 struct ifreq *ifr; 2438 int error; 2439 int oif_flags; 2440 2441 switch (cmd) { 2442 case SIOCGIFCONF: 2443 case OSIOCGIFCONF: 2444 return (ifconf(cmd, data)); 2445 2446 #ifdef COMPAT_FREEBSD32 2447 case SIOCGIFCONF32: 2448 { 2449 struct ifconf32 *ifc32; 2450 struct ifconf ifc; 2451 2452 ifc32 = (struct ifconf32 *)data; 2453 ifc.ifc_len = ifc32->ifc_len; 2454 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2455 2456 return (ifconf(SIOCGIFCONF, (void *)&ifc)); 2457 } 2458 #endif 2459 } 2460 ifr = (struct ifreq *)data; 2461 2462 switch (cmd) { 2463 #ifdef VIMAGE 2464 case SIOCSIFRVNET: 2465 error = priv_check(td, PRIV_NET_SETIFVNET); 2466 if (error) 2467 return (error); 2468 return (if_vmove_reclaim(td, ifr->ifr_name, ifr->ifr_jid)); 2469 #endif 2470 case SIOCIFCREATE: 2471 case SIOCIFCREATE2: 2472 error = priv_check(td, PRIV_NET_IFCREATE); 2473 if (error) 2474 return (error); 2475 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name), 2476 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL)); 2477 case SIOCIFDESTROY: 2478 error = priv_check(td, PRIV_NET_IFDESTROY); 2479 if (error) 2480 return (error); 2481 return if_clone_destroy(ifr->ifr_name); 2482 2483 case SIOCIFGCLONERS: 2484 return (if_clone_list((struct if_clonereq *)data)); 2485 case SIOCGIFGMEMB: 2486 return (if_getgroupmembers((struct ifgroupreq *)data)); 2487 } 2488 2489 ifp = ifunit_ref(ifr->ifr_name); 2490 if (ifp == NULL) 2491 return (ENXIO); 2492 2493 error = ifhwioctl(cmd, ifp, data, td); 2494 if (error != ENOIOCTL) { 2495 if_rele(ifp); 2496 return (error); 2497 } 2498 2499 oif_flags = ifp->if_flags; 2500 if (so->so_proto == NULL) { 2501 if_rele(ifp); 2502 return (EOPNOTSUPP); 2503 } 2504 #ifndef COMPAT_43 2505 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2506 data, 2507 ifp, td)); 2508 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2509 error = (*ifp->if_ioctl)(ifp, cmd, data); 2510 #else 2511 { 2512 u_long ocmd = cmd; 2513 2514 switch (cmd) { 2515 2516 case SIOCSIFDSTADDR: 2517 case SIOCSIFADDR: 2518 case SIOCSIFBRDADDR: 2519 case SIOCSIFNETMASK: 2520 #if BYTE_ORDER != BIG_ENDIAN 2521 if (ifr->ifr_addr.sa_family == 0 && 2522 ifr->ifr_addr.sa_len < 16) { 2523 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2524 ifr->ifr_addr.sa_len = 16; 2525 } 2526 #else 2527 if (ifr->ifr_addr.sa_len == 0) 2528 ifr->ifr_addr.sa_len = 16; 2529 #endif 2530 break; 2531 2532 case OSIOCGIFADDR: 2533 cmd = SIOCGIFADDR; 2534 break; 2535 2536 case OSIOCGIFDSTADDR: 2537 cmd = SIOCGIFDSTADDR; 2538 break; 2539 2540 case OSIOCGIFBRDADDR: 2541 cmd = SIOCGIFBRDADDR; 2542 break; 2543 2544 case OSIOCGIFNETMASK: 2545 cmd = SIOCGIFNETMASK; 2546 } 2547 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2548 cmd, 2549 data, 2550 ifp, td)); 2551 if (error == EOPNOTSUPP && ifp != NULL && 2552 ifp->if_ioctl != NULL) 2553 error = (*ifp->if_ioctl)(ifp, cmd, data); 2554 switch (ocmd) { 2555 2556 case OSIOCGIFADDR: 2557 case OSIOCGIFDSTADDR: 2558 case OSIOCGIFBRDADDR: 2559 case OSIOCGIFNETMASK: 2560 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2561 2562 } 2563 } 2564 #endif /* COMPAT_43 */ 2565 2566 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2567 #ifdef INET6 2568 if (ifp->if_flags & IFF_UP) { 2569 int s = splimp(); 2570 in6_if_up(ifp); 2571 splx(s); 2572 } 2573 #endif 2574 } 2575 if_rele(ifp); 2576 return (error); 2577 } 2578 2579 /* 2580 * The code common to handling reference counted flags, 2581 * e.g., in ifpromisc() and if_allmulti(). 2582 * The "pflag" argument can specify a permanent mode flag to check, 2583 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2584 * 2585 * Only to be used on stack-owned flags, not driver-owned flags. 2586 */ 2587 static int 2588 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2589 { 2590 struct ifreq ifr; 2591 int error; 2592 int oldflags, oldcount; 2593 2594 /* Sanity checks to catch programming errors */ 2595 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2596 ("%s: setting driver-owned flag %d", __func__, flag)); 2597 2598 if (onswitch) 2599 KASSERT(*refcount >= 0, 2600 ("%s: increment negative refcount %d for flag %d", 2601 __func__, *refcount, flag)); 2602 else 2603 KASSERT(*refcount > 0, 2604 ("%s: decrement non-positive refcount %d for flag %d", 2605 __func__, *refcount, flag)); 2606 2607 /* In case this mode is permanent, just touch refcount */ 2608 if (ifp->if_flags & pflag) { 2609 *refcount += onswitch ? 1 : -1; 2610 return (0); 2611 } 2612 2613 /* Save ifnet parameters for if_ioctl() may fail */ 2614 oldcount = *refcount; 2615 oldflags = ifp->if_flags; 2616 2617 /* 2618 * See if we aren't the only and touching refcount is enough. 2619 * Actually toggle interface flag if we are the first or last. 2620 */ 2621 if (onswitch) { 2622 if ((*refcount)++) 2623 return (0); 2624 ifp->if_flags |= flag; 2625 } else { 2626 if (--(*refcount)) 2627 return (0); 2628 ifp->if_flags &= ~flag; 2629 } 2630 2631 /* Call down the driver since we've changed interface flags */ 2632 if (ifp->if_ioctl == NULL) { 2633 error = EOPNOTSUPP; 2634 goto recover; 2635 } 2636 ifr.ifr_flags = ifp->if_flags & 0xffff; 2637 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2638 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2639 if (error) 2640 goto recover; 2641 /* Notify userland that interface flags have changed */ 2642 rt_ifmsg(ifp); 2643 return (0); 2644 2645 recover: 2646 /* Recover after driver error */ 2647 *refcount = oldcount; 2648 ifp->if_flags = oldflags; 2649 return (error); 2650 } 2651 2652 /* 2653 * Set/clear promiscuous mode on interface ifp based on the truth value 2654 * of pswitch. The calls are reference counted so that only the first 2655 * "on" request actually has an effect, as does the final "off" request. 2656 * Results are undefined if the "off" and "on" requests are not matched. 2657 */ 2658 int 2659 ifpromisc(struct ifnet *ifp, int pswitch) 2660 { 2661 int error; 2662 int oldflags = ifp->if_flags; 2663 2664 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2665 &ifp->if_pcount, pswitch); 2666 /* If promiscuous mode status has changed, log a message */ 2667 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2668 log(LOG_INFO, "%s: promiscuous mode %s\n", 2669 ifp->if_xname, 2670 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2671 return (error); 2672 } 2673 2674 /* 2675 * Return interface configuration 2676 * of system. List may be used 2677 * in later ioctl's (above) to get 2678 * other information. 2679 */ 2680 /*ARGSUSED*/ 2681 static int 2682 ifconf(u_long cmd, caddr_t data) 2683 { 2684 struct ifconf *ifc = (struct ifconf *)data; 2685 struct ifnet *ifp; 2686 struct ifaddr *ifa; 2687 struct ifreq ifr; 2688 struct sbuf *sb; 2689 int error, full = 0, valid_len, max_len; 2690 2691 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2692 max_len = MAXPHYS - 1; 2693 2694 /* Prevent hostile input from being able to crash the system */ 2695 if (ifc->ifc_len <= 0) 2696 return (EINVAL); 2697 2698 again: 2699 if (ifc->ifc_len <= max_len) { 2700 max_len = ifc->ifc_len; 2701 full = 1; 2702 } 2703 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2704 max_len = 0; 2705 valid_len = 0; 2706 2707 IFNET_RLOCK(); 2708 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2709 int addrs; 2710 2711 /* 2712 * Zero the ifr_name buffer to make sure we don't 2713 * disclose the contents of the stack. 2714 */ 2715 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2716 2717 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2718 >= sizeof(ifr.ifr_name)) { 2719 sbuf_delete(sb); 2720 IFNET_RUNLOCK(); 2721 return (ENAMETOOLONG); 2722 } 2723 2724 addrs = 0; 2725 IF_ADDR_LOCK(ifp); 2726 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2727 struct sockaddr *sa = ifa->ifa_addr; 2728 2729 if (prison_if(curthread->td_ucred, sa) != 0) 2730 continue; 2731 addrs++; 2732 #ifdef COMPAT_43 2733 if (cmd == OSIOCGIFCONF) { 2734 struct osockaddr *osa = 2735 (struct osockaddr *)&ifr.ifr_addr; 2736 ifr.ifr_addr = *sa; 2737 osa->sa_family = sa->sa_family; 2738 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2739 max_len += sizeof(ifr); 2740 } else 2741 #endif 2742 if (sa->sa_len <= sizeof(*sa)) { 2743 ifr.ifr_addr = *sa; 2744 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2745 max_len += sizeof(ifr); 2746 } else { 2747 sbuf_bcat(sb, &ifr, 2748 offsetof(struct ifreq, ifr_addr)); 2749 max_len += offsetof(struct ifreq, ifr_addr); 2750 sbuf_bcat(sb, sa, sa->sa_len); 2751 max_len += sa->sa_len; 2752 } 2753 2754 if (sbuf_error(sb) == 0) 2755 valid_len = sbuf_len(sb); 2756 } 2757 IF_ADDR_UNLOCK(ifp); 2758 if (addrs == 0) { 2759 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2760 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2761 max_len += sizeof(ifr); 2762 2763 if (sbuf_error(sb) == 0) 2764 valid_len = sbuf_len(sb); 2765 } 2766 } 2767 IFNET_RUNLOCK(); 2768 2769 /* 2770 * If we didn't allocate enough space (uncommon), try again. If 2771 * we have already allocated as much space as we are allowed, 2772 * return what we've got. 2773 */ 2774 if (valid_len != max_len && !full) { 2775 sbuf_delete(sb); 2776 goto again; 2777 } 2778 2779 ifc->ifc_len = valid_len; 2780 sbuf_finish(sb); 2781 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2782 sbuf_delete(sb); 2783 return (error); 2784 } 2785 2786 /* 2787 * Just like ifpromisc(), but for all-multicast-reception mode. 2788 */ 2789 int 2790 if_allmulti(struct ifnet *ifp, int onswitch) 2791 { 2792 2793 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2794 } 2795 2796 struct ifmultiaddr * 2797 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2798 { 2799 struct ifmultiaddr *ifma; 2800 2801 IF_ADDR_LOCK_ASSERT(ifp); 2802 2803 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2804 if (sa->sa_family == AF_LINK) { 2805 if (sa_dl_equal(ifma->ifma_addr, sa)) 2806 break; 2807 } else { 2808 if (sa_equal(ifma->ifma_addr, sa)) 2809 break; 2810 } 2811 } 2812 2813 return ifma; 2814 } 2815 2816 /* 2817 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2818 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2819 * the ifnet multicast address list here, so the caller must do that and 2820 * other setup work (such as notifying the device driver). The reference 2821 * count is initialized to 1. 2822 */ 2823 static struct ifmultiaddr * 2824 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2825 int mflags) 2826 { 2827 struct ifmultiaddr *ifma; 2828 struct sockaddr *dupsa; 2829 2830 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2831 M_ZERO); 2832 if (ifma == NULL) 2833 return (NULL); 2834 2835 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2836 if (dupsa == NULL) { 2837 free(ifma, M_IFMADDR); 2838 return (NULL); 2839 } 2840 bcopy(sa, dupsa, sa->sa_len); 2841 ifma->ifma_addr = dupsa; 2842 2843 ifma->ifma_ifp = ifp; 2844 ifma->ifma_refcount = 1; 2845 ifma->ifma_protospec = NULL; 2846 2847 if (llsa == NULL) { 2848 ifma->ifma_lladdr = NULL; 2849 return (ifma); 2850 } 2851 2852 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2853 if (dupsa == NULL) { 2854 free(ifma->ifma_addr, M_IFMADDR); 2855 free(ifma, M_IFMADDR); 2856 return (NULL); 2857 } 2858 bcopy(llsa, dupsa, llsa->sa_len); 2859 ifma->ifma_lladdr = dupsa; 2860 2861 return (ifma); 2862 } 2863 2864 /* 2865 * if_freemulti: free ifmultiaddr structure and possibly attached related 2866 * addresses. The caller is responsible for implementing reference 2867 * counting, notifying the driver, handling routing messages, and releasing 2868 * any dependent link layer state. 2869 */ 2870 static void 2871 if_freemulti(struct ifmultiaddr *ifma) 2872 { 2873 2874 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2875 ifma->ifma_refcount)); 2876 KASSERT(ifma->ifma_protospec == NULL, 2877 ("if_freemulti: protospec not NULL")); 2878 2879 if (ifma->ifma_lladdr != NULL) 2880 free(ifma->ifma_lladdr, M_IFMADDR); 2881 free(ifma->ifma_addr, M_IFMADDR); 2882 free(ifma, M_IFMADDR); 2883 } 2884 2885 /* 2886 * Register an additional multicast address with a network interface. 2887 * 2888 * - If the address is already present, bump the reference count on the 2889 * address and return. 2890 * - If the address is not link-layer, look up a link layer address. 2891 * - Allocate address structures for one or both addresses, and attach to the 2892 * multicast address list on the interface. If automatically adding a link 2893 * layer address, the protocol address will own a reference to the link 2894 * layer address, to be freed when it is freed. 2895 * - Notify the network device driver of an addition to the multicast address 2896 * list. 2897 * 2898 * 'sa' points to caller-owned memory with the desired multicast address. 2899 * 2900 * 'retifma' will be used to return a pointer to the resulting multicast 2901 * address reference, if desired. 2902 */ 2903 int 2904 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2905 struct ifmultiaddr **retifma) 2906 { 2907 struct ifmultiaddr *ifma, *ll_ifma; 2908 struct sockaddr *llsa; 2909 int error; 2910 2911 /* 2912 * If the address is already present, return a new reference to it; 2913 * otherwise, allocate storage and set up a new address. 2914 */ 2915 IF_ADDR_LOCK(ifp); 2916 ifma = if_findmulti(ifp, sa); 2917 if (ifma != NULL) { 2918 ifma->ifma_refcount++; 2919 if (retifma != NULL) 2920 *retifma = ifma; 2921 IF_ADDR_UNLOCK(ifp); 2922 return (0); 2923 } 2924 2925 /* 2926 * The address isn't already present; resolve the protocol address 2927 * into a link layer address, and then look that up, bump its 2928 * refcount or allocate an ifma for that also. If 'llsa' was 2929 * returned, we will need to free it later. 2930 */ 2931 llsa = NULL; 2932 ll_ifma = NULL; 2933 if (ifp->if_resolvemulti != NULL) { 2934 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2935 if (error) 2936 goto unlock_out; 2937 } 2938 2939 /* 2940 * Allocate the new address. Don't hook it up yet, as we may also 2941 * need to allocate a link layer multicast address. 2942 */ 2943 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2944 if (ifma == NULL) { 2945 error = ENOMEM; 2946 goto free_llsa_out; 2947 } 2948 2949 /* 2950 * If a link layer address is found, we'll need to see if it's 2951 * already present in the address list, or allocate is as well. 2952 * When this block finishes, the link layer address will be on the 2953 * list. 2954 */ 2955 if (llsa != NULL) { 2956 ll_ifma = if_findmulti(ifp, llsa); 2957 if (ll_ifma == NULL) { 2958 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2959 if (ll_ifma == NULL) { 2960 --ifma->ifma_refcount; 2961 if_freemulti(ifma); 2962 error = ENOMEM; 2963 goto free_llsa_out; 2964 } 2965 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2966 ifma_link); 2967 } else 2968 ll_ifma->ifma_refcount++; 2969 ifma->ifma_llifma = ll_ifma; 2970 } 2971 2972 /* 2973 * We now have a new multicast address, ifma, and possibly a new or 2974 * referenced link layer address. Add the primary address to the 2975 * ifnet address list. 2976 */ 2977 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2978 2979 if (retifma != NULL) 2980 *retifma = ifma; 2981 2982 /* 2983 * Must generate the message while holding the lock so that 'ifma' 2984 * pointer is still valid. 2985 */ 2986 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 2987 IF_ADDR_UNLOCK(ifp); 2988 2989 /* 2990 * We are certain we have added something, so call down to the 2991 * interface to let them know about it. 2992 */ 2993 if (ifp->if_ioctl != NULL) { 2994 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 2995 } 2996 2997 if (llsa != NULL) 2998 free(llsa, M_IFMADDR); 2999 3000 return (0); 3001 3002 free_llsa_out: 3003 if (llsa != NULL) 3004 free(llsa, M_IFMADDR); 3005 3006 unlock_out: 3007 IF_ADDR_UNLOCK(ifp); 3008 return (error); 3009 } 3010 3011 /* 3012 * Delete a multicast group membership by network-layer group address. 3013 * 3014 * Returns ENOENT if the entry could not be found. If ifp no longer 3015 * exists, results are undefined. This entry point should only be used 3016 * from subsystems which do appropriate locking to hold ifp for the 3017 * duration of the call. 3018 * Network-layer protocol domains must use if_delmulti_ifma(). 3019 */ 3020 int 3021 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3022 { 3023 struct ifmultiaddr *ifma; 3024 int lastref; 3025 #ifdef INVARIANTS 3026 struct ifnet *oifp; 3027 3028 IFNET_RLOCK_NOSLEEP(); 3029 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3030 if (ifp == oifp) 3031 break; 3032 if (ifp != oifp) 3033 ifp = NULL; 3034 IFNET_RUNLOCK_NOSLEEP(); 3035 3036 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3037 #endif 3038 if (ifp == NULL) 3039 return (ENOENT); 3040 3041 IF_ADDR_LOCK(ifp); 3042 lastref = 0; 3043 ifma = if_findmulti(ifp, sa); 3044 if (ifma != NULL) 3045 lastref = if_delmulti_locked(ifp, ifma, 0); 3046 IF_ADDR_UNLOCK(ifp); 3047 3048 if (ifma == NULL) 3049 return (ENOENT); 3050 3051 if (lastref && ifp->if_ioctl != NULL) { 3052 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3053 } 3054 3055 return (0); 3056 } 3057 3058 /* 3059 * Delete all multicast group membership for an interface. 3060 * Should be used to quickly flush all multicast filters. 3061 */ 3062 void 3063 if_delallmulti(struct ifnet *ifp) 3064 { 3065 struct ifmultiaddr *ifma; 3066 struct ifmultiaddr *next; 3067 3068 IF_ADDR_LOCK(ifp); 3069 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3070 if_delmulti_locked(ifp, ifma, 0); 3071 IF_ADDR_UNLOCK(ifp); 3072 } 3073 3074 /* 3075 * Delete a multicast group membership by group membership pointer. 3076 * Network-layer protocol domains must use this routine. 3077 * 3078 * It is safe to call this routine if the ifp disappeared. 3079 */ 3080 void 3081 if_delmulti_ifma(struct ifmultiaddr *ifma) 3082 { 3083 struct ifnet *ifp; 3084 int lastref; 3085 3086 ifp = ifma->ifma_ifp; 3087 #ifdef DIAGNOSTIC 3088 if (ifp == NULL) { 3089 printf("%s: ifma_ifp seems to be detached\n", __func__); 3090 } else { 3091 struct ifnet *oifp; 3092 3093 IFNET_RLOCK_NOSLEEP(); 3094 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3095 if (ifp == oifp) 3096 break; 3097 if (ifp != oifp) { 3098 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3099 ifp = NULL; 3100 } 3101 IFNET_RUNLOCK_NOSLEEP(); 3102 } 3103 #endif 3104 /* 3105 * If and only if the ifnet instance exists: Acquire the address lock. 3106 */ 3107 if (ifp != NULL) 3108 IF_ADDR_LOCK(ifp); 3109 3110 lastref = if_delmulti_locked(ifp, ifma, 0); 3111 3112 if (ifp != NULL) { 3113 /* 3114 * If and only if the ifnet instance exists: 3115 * Release the address lock. 3116 * If the group was left: update the hardware hash filter. 3117 */ 3118 IF_ADDR_UNLOCK(ifp); 3119 if (lastref && ifp->if_ioctl != NULL) { 3120 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3121 } 3122 } 3123 } 3124 3125 /* 3126 * Perform deletion of network-layer and/or link-layer multicast address. 3127 * 3128 * Return 0 if the reference count was decremented. 3129 * Return 1 if the final reference was released, indicating that the 3130 * hardware hash filter should be reprogrammed. 3131 */ 3132 static int 3133 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3134 { 3135 struct ifmultiaddr *ll_ifma; 3136 3137 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3138 KASSERT(ifma->ifma_ifp == ifp, 3139 ("%s: inconsistent ifp %p", __func__, ifp)); 3140 IF_ADDR_LOCK_ASSERT(ifp); 3141 } 3142 3143 ifp = ifma->ifma_ifp; 3144 3145 /* 3146 * If the ifnet is detaching, null out references to ifnet, 3147 * so that upper protocol layers will notice, and not attempt 3148 * to obtain locks for an ifnet which no longer exists. The 3149 * routing socket announcement must happen before the ifnet 3150 * instance is detached from the system. 3151 */ 3152 if (detaching) { 3153 #ifdef DIAGNOSTIC 3154 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3155 #endif 3156 /* 3157 * ifp may already be nulled out if we are being reentered 3158 * to delete the ll_ifma. 3159 */ 3160 if (ifp != NULL) { 3161 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3162 ifma->ifma_ifp = NULL; 3163 } 3164 } 3165 3166 if (--ifma->ifma_refcount > 0) 3167 return 0; 3168 3169 /* 3170 * If this ifma is a network-layer ifma, a link-layer ifma may 3171 * have been associated with it. Release it first if so. 3172 */ 3173 ll_ifma = ifma->ifma_llifma; 3174 if (ll_ifma != NULL) { 3175 KASSERT(ifma->ifma_lladdr != NULL, 3176 ("%s: llifma w/o lladdr", __func__)); 3177 if (detaching) 3178 ll_ifma->ifma_ifp = NULL; /* XXX */ 3179 if (--ll_ifma->ifma_refcount == 0) { 3180 if (ifp != NULL) { 3181 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3182 ifma_link); 3183 } 3184 if_freemulti(ll_ifma); 3185 } 3186 } 3187 3188 if (ifp != NULL) 3189 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3190 3191 if_freemulti(ifma); 3192 3193 /* 3194 * The last reference to this instance of struct ifmultiaddr 3195 * was released; the hardware should be notified of this change. 3196 */ 3197 return 1; 3198 } 3199 3200 /* 3201 * Set the link layer address on an interface. 3202 * 3203 * At this time we only support certain types of interfaces, 3204 * and we don't allow the length of the address to change. 3205 */ 3206 int 3207 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3208 { 3209 struct sockaddr_dl *sdl; 3210 struct ifaddr *ifa; 3211 struct ifreq ifr; 3212 3213 IF_ADDR_LOCK(ifp); 3214 ifa = ifp->if_addr; 3215 if (ifa == NULL) { 3216 IF_ADDR_UNLOCK(ifp); 3217 return (EINVAL); 3218 } 3219 ifa_ref(ifa); 3220 IF_ADDR_UNLOCK(ifp); 3221 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3222 if (sdl == NULL) { 3223 ifa_free(ifa); 3224 return (EINVAL); 3225 } 3226 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3227 ifa_free(ifa); 3228 return (EINVAL); 3229 } 3230 switch (ifp->if_type) { 3231 case IFT_ETHER: 3232 case IFT_FDDI: 3233 case IFT_XETHER: 3234 case IFT_ISO88025: 3235 case IFT_L2VLAN: 3236 case IFT_BRIDGE: 3237 case IFT_ARCNET: 3238 case IFT_IEEE8023ADLAG: 3239 case IFT_IEEE80211: 3240 bcopy(lladdr, LLADDR(sdl), len); 3241 ifa_free(ifa); 3242 break; 3243 default: 3244 ifa_free(ifa); 3245 return (ENODEV); 3246 } 3247 3248 /* 3249 * If the interface is already up, we need 3250 * to re-init it in order to reprogram its 3251 * address filter. 3252 */ 3253 if ((ifp->if_flags & IFF_UP) != 0) { 3254 if (ifp->if_ioctl) { 3255 ifp->if_flags &= ~IFF_UP; 3256 ifr.ifr_flags = ifp->if_flags & 0xffff; 3257 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3258 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3259 ifp->if_flags |= IFF_UP; 3260 ifr.ifr_flags = ifp->if_flags & 0xffff; 3261 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3262 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3263 } 3264 #ifdef INET 3265 /* 3266 * Also send gratuitous ARPs to notify other nodes about 3267 * the address change. 3268 */ 3269 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3270 if (ifa->ifa_addr->sa_family == AF_INET) 3271 arp_ifinit(ifp, ifa); 3272 } 3273 #endif 3274 } 3275 return (0); 3276 } 3277 3278 /* 3279 * The name argument must be a pointer to storage which will last as 3280 * long as the interface does. For physical devices, the result of 3281 * device_get_name(dev) is a good choice and for pseudo-devices a 3282 * static string works well. 3283 */ 3284 void 3285 if_initname(struct ifnet *ifp, const char *name, int unit) 3286 { 3287 ifp->if_dname = name; 3288 ifp->if_dunit = unit; 3289 if (unit != IF_DUNIT_NONE) 3290 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3291 else 3292 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3293 } 3294 3295 int 3296 if_printf(struct ifnet *ifp, const char * fmt, ...) 3297 { 3298 va_list ap; 3299 int retval; 3300 3301 retval = printf("%s: ", ifp->if_xname); 3302 va_start(ap, fmt); 3303 retval += vprintf(fmt, ap); 3304 va_end(ap); 3305 return (retval); 3306 } 3307 3308 void 3309 if_start(struct ifnet *ifp) 3310 { 3311 3312 (*(ifp)->if_start)(ifp); 3313 } 3314 3315 /* 3316 * Backwards compatibility interface for drivers 3317 * that have not implemented it 3318 */ 3319 static int 3320 if_transmit(struct ifnet *ifp, struct mbuf *m) 3321 { 3322 int error; 3323 3324 IFQ_HANDOFF(ifp, m, error); 3325 return (error); 3326 } 3327 3328 int 3329 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3330 { 3331 int active = 0; 3332 3333 IF_LOCK(ifq); 3334 if (_IF_QFULL(ifq)) { 3335 _IF_DROP(ifq); 3336 IF_UNLOCK(ifq); 3337 m_freem(m); 3338 return (0); 3339 } 3340 if (ifp != NULL) { 3341 ifp->if_obytes += m->m_pkthdr.len + adjust; 3342 if (m->m_flags & (M_BCAST|M_MCAST)) 3343 ifp->if_omcasts++; 3344 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3345 } 3346 _IF_ENQUEUE(ifq, m); 3347 IF_UNLOCK(ifq); 3348 if (ifp != NULL && !active) 3349 (*(ifp)->if_start)(ifp); 3350 return (1); 3351 } 3352 3353 void 3354 if_register_com_alloc(u_char type, 3355 if_com_alloc_t *a, if_com_free_t *f) 3356 { 3357 3358 KASSERT(if_com_alloc[type] == NULL, 3359 ("if_register_com_alloc: %d already registered", type)); 3360 KASSERT(if_com_free[type] == NULL, 3361 ("if_register_com_alloc: %d free already registered", type)); 3362 3363 if_com_alloc[type] = a; 3364 if_com_free[type] = f; 3365 } 3366 3367 void 3368 if_deregister_com_alloc(u_char type) 3369 { 3370 3371 KASSERT(if_com_alloc[type] != NULL, 3372 ("if_deregister_com_alloc: %d not registered", type)); 3373 KASSERT(if_com_free[type] != NULL, 3374 ("if_deregister_com_alloc: %d free not registered", type)); 3375 if_com_alloc[type] = NULL; 3376 if_com_free[type] = NULL; 3377 } 3378