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 <sys/priv.h> 62 63 #include <machine/stdarg.h> 64 #include <vm/uma.h> 65 66 #include <net/if.h> 67 #include <net/if_arp.h> 68 #include <net/if_clone.h> 69 #include <net/if_dl.h> 70 #include <net/if_types.h> 71 #include <net/if_var.h> 72 #include <net/radix.h> 73 #include <net/route.h> 74 #include <net/vnet.h> 75 76 #if defined(INET) || defined(INET6) 77 #include <netinet/in.h> 78 #include <netinet/in_var.h> 79 #include <netinet/ip.h> 80 #include <netinet/ip_carp.h> 81 #ifdef INET 82 #include <netinet/if_ether.h> 83 #endif /* INET */ 84 #ifdef INET6 85 #include <netinet6/in6_var.h> 86 #include <netinet6/in6_ifattach.h> 87 #endif /* INET6 */ 88 #endif /* INET || INET6 */ 89 90 #include <security/mac/mac_framework.h> 91 92 #ifdef COMPAT_FREEBSD32 93 #include <sys/mount.h> 94 #include <compat/freebsd32/freebsd32.h> 95 #endif 96 97 struct ifindex_entry { 98 struct ifnet *ife_ifnet; 99 }; 100 101 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 102 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 103 104 TUNABLE_INT("net.link.ifqmaxlen", &ifqmaxlen); 105 SYSCTL_INT(_net_link, OID_AUTO, ifqmaxlen, CTLFLAG_RDTUN, 106 &ifqmaxlen, 0, "max send queue size"); 107 108 /* Log link state change events */ 109 static int log_link_state_change = 1; 110 111 SYSCTL_INT(_net_link, OID_AUTO, log_link_state_change, CTLFLAG_RW, 112 &log_link_state_change, 0, 113 "log interface link state change events"); 114 115 /* Interface description */ 116 static unsigned int ifdescr_maxlen = 1024; 117 SYSCTL_UINT(_net, OID_AUTO, ifdescr_maxlen, CTLFLAG_RW, 118 &ifdescr_maxlen, 0, 119 "administrative maximum length for interface description"); 120 121 static MALLOC_DEFINE(M_IFDESCR, "ifdescr", "ifnet descriptions"); 122 123 /* global sx for non-critical path ifdescr */ 124 static struct sx ifdescr_sx; 125 SX_SYSINIT(ifdescr_sx, &ifdescr_sx, "ifnet descr"); 126 127 void (*bridge_linkstate_p)(struct ifnet *ifp); 128 void (*ng_ether_link_state_p)(struct ifnet *ifp, int state); 129 void (*lagg_linkstate_p)(struct ifnet *ifp, int state); 130 /* These are external hooks for CARP. */ 131 void (*carp_linkstate_p)(struct ifnet *ifp); 132 void (*carp_demote_adj_p)(int, char *); 133 int (*carp_master_p)(struct ifaddr *); 134 #if defined(INET) || defined(INET6) 135 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 136 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 137 const struct sockaddr *sa); 138 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 139 int (*carp_attach_p)(struct ifaddr *, int); 140 void (*carp_detach_p)(struct ifaddr *); 141 #endif 142 #ifdef INET 143 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 144 #endif 145 #ifdef INET6 146 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 147 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 148 const struct in6_addr *taddr); 149 #endif 150 151 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 152 153 /* 154 * XXX: Style; these should be sorted alphabetically, and unprototyped 155 * static functions should be prototyped. Currently they are sorted by 156 * declaration order. 157 */ 158 static void if_attachdomain(void *); 159 static void if_attachdomain1(struct ifnet *); 160 static int ifconf(u_long, caddr_t); 161 static void if_freemulti(struct ifmultiaddr *); 162 static void if_init(void *); 163 static void if_grow(void); 164 static void if_route(struct ifnet *, int flag, int fam); 165 static int if_setflag(struct ifnet *, int, int, int *, int); 166 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 167 static void if_unroute(struct ifnet *, int flag, int fam); 168 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 169 static int if_rtdel(struct radix_node *, void *); 170 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 171 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 172 static void do_link_state_change(void *, int); 173 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 174 static int if_getgroupmembers(struct ifgroupreq *); 175 static void if_delgroups(struct ifnet *); 176 static void if_attach_internal(struct ifnet *, int); 177 static void if_detach_internal(struct ifnet *, int); 178 179 #ifdef INET6 180 /* 181 * XXX: declare here to avoid to include many inet6 related files.. 182 * should be more generalized? 183 */ 184 extern void nd6_setmtu(struct ifnet *); 185 #endif 186 187 VNET_DEFINE(int, if_index); 188 int ifqmaxlen = IFQ_MAXLEN; 189 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 190 VNET_DEFINE(struct ifgrouphead, ifg_head); 191 192 static VNET_DEFINE(int, if_indexlim) = 8; 193 194 /* Table of ifnet by index. */ 195 VNET_DEFINE(struct ifindex_entry *, ifindex_table); 196 197 #define V_if_indexlim VNET(if_indexlim) 198 #define V_ifindex_table VNET(ifindex_table) 199 200 /* 201 * The global network interface list (V_ifnet) and related state (such as 202 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 203 * an rwlock. Either may be acquired shared to stablize the list, but both 204 * must be acquired writable to modify the list. This model allows us to 205 * both stablize the interface list during interrupt thread processing, but 206 * also to stablize it over long-running ioctls, without introducing priority 207 * inversions and deadlocks. 208 */ 209 struct rwlock ifnet_rwlock; 210 struct sx ifnet_sxlock; 211 212 /* 213 * The allocation of network interfaces is a rather non-atomic affair; we 214 * need to select an index before we are ready to expose the interface for 215 * use, so will use this pointer value to indicate reservation. 216 */ 217 #define IFNET_HOLD (void *)(uintptr_t)(-1) 218 219 static if_com_alloc_t *if_com_alloc[256]; 220 static if_com_free_t *if_com_free[256]; 221 222 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 223 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 224 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 225 226 struct ifnet * 227 ifnet_byindex_locked(u_short idx) 228 { 229 230 if (idx > V_if_index) 231 return (NULL); 232 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 233 return (NULL); 234 return (V_ifindex_table[idx].ife_ifnet); 235 } 236 237 struct ifnet * 238 ifnet_byindex(u_short idx) 239 { 240 struct ifnet *ifp; 241 242 IFNET_RLOCK_NOSLEEP(); 243 ifp = ifnet_byindex_locked(idx); 244 IFNET_RUNLOCK_NOSLEEP(); 245 return (ifp); 246 } 247 248 struct ifnet * 249 ifnet_byindex_ref(u_short idx) 250 { 251 struct ifnet *ifp; 252 253 IFNET_RLOCK_NOSLEEP(); 254 ifp = ifnet_byindex_locked(idx); 255 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 256 IFNET_RUNLOCK_NOSLEEP(); 257 return (NULL); 258 } 259 if_ref(ifp); 260 IFNET_RUNLOCK_NOSLEEP(); 261 return (ifp); 262 } 263 264 /* 265 * Allocate an ifindex array entry; return 0 on success or an error on 266 * failure. 267 */ 268 static int 269 ifindex_alloc_locked(u_short *idxp) 270 { 271 u_short idx; 272 273 IFNET_WLOCK_ASSERT(); 274 275 retry: 276 /* 277 * Try to find an empty slot below V_if_index. If we fail, take the 278 * next slot. 279 */ 280 for (idx = 1; idx <= V_if_index; idx++) { 281 if (V_ifindex_table[idx].ife_ifnet == NULL) 282 break; 283 } 284 285 /* Catch if_index overflow. */ 286 if (idx < 1) 287 return (ENOSPC); 288 if (idx >= V_if_indexlim) { 289 if_grow(); 290 goto retry; 291 } 292 if (idx > V_if_index) 293 V_if_index = idx; 294 *idxp = idx; 295 return (0); 296 } 297 298 static void 299 ifindex_free_locked(u_short idx) 300 { 301 302 IFNET_WLOCK_ASSERT(); 303 304 V_ifindex_table[idx].ife_ifnet = NULL; 305 while (V_if_index > 0 && 306 V_ifindex_table[V_if_index].ife_ifnet == NULL) 307 V_if_index--; 308 } 309 310 static void 311 ifindex_free(u_short idx) 312 { 313 314 IFNET_WLOCK(); 315 ifindex_free_locked(idx); 316 IFNET_WUNLOCK(); 317 } 318 319 static void 320 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 321 { 322 323 IFNET_WLOCK_ASSERT(); 324 325 V_ifindex_table[idx].ife_ifnet = ifp; 326 } 327 328 static void 329 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 330 { 331 332 IFNET_WLOCK(); 333 ifnet_setbyindex_locked(idx, ifp); 334 IFNET_WUNLOCK(); 335 } 336 337 struct ifaddr * 338 ifaddr_byindex(u_short idx) 339 { 340 struct ifaddr *ifa; 341 342 IFNET_RLOCK_NOSLEEP(); 343 ifa = ifnet_byindex_locked(idx)->if_addr; 344 if (ifa != NULL) 345 ifa_ref(ifa); 346 IFNET_RUNLOCK_NOSLEEP(); 347 return (ifa); 348 } 349 350 /* 351 * Network interface utility routines. 352 * 353 * Routines with ifa_ifwith* names take sockaddr *'s as 354 * parameters. 355 */ 356 357 static void 358 vnet_if_init(const void *unused __unused) 359 { 360 361 TAILQ_INIT(&V_ifnet); 362 TAILQ_INIT(&V_ifg_head); 363 IFNET_WLOCK(); 364 if_grow(); /* create initial table */ 365 IFNET_WUNLOCK(); 366 vnet_if_clone_init(); 367 } 368 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 369 NULL); 370 371 /* ARGSUSED*/ 372 static void 373 if_init(void *dummy __unused) 374 { 375 376 IFNET_LOCK_INIT(); 377 if_clone_init(); 378 } 379 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 380 381 382 #ifdef VIMAGE 383 static void 384 vnet_if_uninit(const void *unused __unused) 385 { 386 387 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 388 "not empty", __func__, __LINE__, &V_ifnet)); 389 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 390 "not empty", __func__, __LINE__, &V_ifg_head)); 391 392 free((caddr_t)V_ifindex_table, M_IFNET); 393 } 394 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 395 vnet_if_uninit, NULL); 396 #endif 397 398 static void 399 if_grow(void) 400 { 401 int oldlim; 402 u_int n; 403 struct ifindex_entry *e; 404 405 IFNET_WLOCK_ASSERT(); 406 oldlim = V_if_indexlim; 407 IFNET_WUNLOCK(); 408 n = (oldlim << 1) * sizeof(*e); 409 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 410 IFNET_WLOCK(); 411 if (V_if_indexlim != oldlim) { 412 free(e, M_IFNET); 413 return; 414 } 415 if (V_ifindex_table != NULL) { 416 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 417 free((caddr_t)V_ifindex_table, M_IFNET); 418 } 419 V_if_indexlim <<= 1; 420 V_ifindex_table = e; 421 } 422 423 /* 424 * Allocate a struct ifnet and an index for an interface. A layer 2 425 * common structure will also be allocated if an allocation routine is 426 * registered for the passed type. 427 */ 428 struct ifnet * 429 if_alloc(u_char type) 430 { 431 struct ifnet *ifp; 432 u_short idx; 433 434 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 435 IFNET_WLOCK(); 436 if (ifindex_alloc_locked(&idx) != 0) { 437 IFNET_WUNLOCK(); 438 free(ifp, M_IFNET); 439 return (NULL); 440 } 441 ifnet_setbyindex_locked(idx, IFNET_HOLD); 442 IFNET_WUNLOCK(); 443 ifp->if_index = idx; 444 ifp->if_type = type; 445 ifp->if_alloctype = type; 446 if (if_com_alloc[type] != NULL) { 447 ifp->if_l2com = if_com_alloc[type](type, ifp); 448 if (ifp->if_l2com == NULL) { 449 free(ifp, M_IFNET); 450 ifindex_free(idx); 451 return (NULL); 452 } 453 } 454 455 IF_ADDR_LOCK_INIT(ifp); 456 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 457 ifp->if_afdata_initialized = 0; 458 IF_AFDATA_LOCK_INIT(ifp); 459 TAILQ_INIT(&ifp->if_addrhead); 460 TAILQ_INIT(&ifp->if_multiaddrs); 461 TAILQ_INIT(&ifp->if_groups); 462 #ifdef MAC 463 mac_ifnet_init(ifp); 464 #endif 465 ifq_init(&ifp->if_snd, ifp); 466 467 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 468 ifnet_setbyindex(ifp->if_index, ifp); 469 return (ifp); 470 } 471 472 /* 473 * Do the actual work of freeing a struct ifnet, and layer 2 common 474 * structure. This call is made when the last reference to an 475 * interface is released. 476 */ 477 static void 478 if_free_internal(struct ifnet *ifp) 479 { 480 481 KASSERT((ifp->if_flags & IFF_DYING), 482 ("if_free_internal: interface not dying")); 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 * Deregister an interface and free the associated storage. 501 */ 502 void 503 if_free(struct ifnet *ifp) 504 { 505 506 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 507 508 IFNET_WLOCK(); 509 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 510 ("%s: freeing unallocated ifnet", ifp->if_xname)); 511 512 ifindex_free_locked(ifp->if_index); 513 IFNET_WUNLOCK(); 514 515 if (!refcount_release(&ifp->if_refcount)) 516 return; 517 if_free_internal(ifp); 518 } 519 520 /* 521 * Interfaces to keep an ifnet type-stable despite the possibility of the 522 * driver calling if_free(). If there are additional references, we defer 523 * freeing the underlying data structure. 524 */ 525 void 526 if_ref(struct ifnet *ifp) 527 { 528 529 /* We don't assert the ifnet list lock here, but arguably should. */ 530 refcount_acquire(&ifp->if_refcount); 531 } 532 533 void 534 if_rele(struct ifnet *ifp) 535 { 536 537 if (!refcount_release(&ifp->if_refcount)) 538 return; 539 if_free_internal(ifp); 540 } 541 542 void 543 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 544 { 545 546 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 547 548 if (ifq->ifq_maxlen == 0) 549 ifq->ifq_maxlen = ifqmaxlen; 550 551 ifq->altq_type = 0; 552 ifq->altq_disc = NULL; 553 ifq->altq_flags &= ALTQF_CANTCHANGE; 554 ifq->altq_tbr = NULL; 555 ifq->altq_ifp = ifp; 556 } 557 558 void 559 ifq_delete(struct ifaltq *ifq) 560 { 561 mtx_destroy(&ifq->ifq_mtx); 562 } 563 564 /* 565 * Perform generic interface initalization tasks and attach the interface 566 * to the list of "active" interfaces. If vmove flag is set on entry 567 * to if_attach_internal(), perform only a limited subset of initialization 568 * tasks, given that we are moving from one vnet to another an ifnet which 569 * has already been fully initialized. 570 * 571 * XXX: 572 * - The decision to return void and thus require this function to 573 * succeed is questionable. 574 * - We should probably do more sanity checking. For instance we don't 575 * do anything to insure if_xname is unique or non-empty. 576 */ 577 void 578 if_attach(struct ifnet *ifp) 579 { 580 581 if_attach_internal(ifp, 0); 582 } 583 584 static void 585 if_attach_internal(struct ifnet *ifp, int vmove) 586 { 587 unsigned socksize, ifasize; 588 int namelen, masklen; 589 struct sockaddr_dl *sdl; 590 struct ifaddr *ifa; 591 592 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 593 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 594 ifp->if_xname); 595 596 #ifdef VIMAGE 597 ifp->if_vnet = curvnet; 598 if (ifp->if_home_vnet == NULL) 599 ifp->if_home_vnet = curvnet; 600 #endif 601 602 if_addgroup(ifp, IFG_ALL); 603 604 getmicrotime(&ifp->if_lastchange); 605 ifp->if_data.ifi_epoch = time_uptime; 606 ifp->if_data.ifi_datalen = sizeof(struct if_data); 607 608 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 609 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 610 ("transmit and qflush must both either be set or both be NULL")); 611 if (ifp->if_transmit == NULL) { 612 ifp->if_transmit = if_transmit; 613 ifp->if_qflush = if_qflush; 614 } 615 616 if (!vmove) { 617 #ifdef MAC 618 mac_ifnet_create(ifp); 619 #endif 620 621 /* 622 * Create a Link Level name for this device. 623 */ 624 namelen = strlen(ifp->if_xname); 625 /* 626 * Always save enough space for any possiable name so we 627 * can do a rename in place later. 628 */ 629 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 630 socksize = masklen + ifp->if_addrlen; 631 if (socksize < sizeof(*sdl)) 632 socksize = sizeof(*sdl); 633 socksize = roundup2(socksize, sizeof(long)); 634 ifasize = sizeof(*ifa) + 2 * socksize; 635 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 636 ifa_init(ifa); 637 sdl = (struct sockaddr_dl *)(ifa + 1); 638 sdl->sdl_len = socksize; 639 sdl->sdl_family = AF_LINK; 640 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 641 sdl->sdl_nlen = namelen; 642 sdl->sdl_index = ifp->if_index; 643 sdl->sdl_type = ifp->if_type; 644 ifp->if_addr = ifa; 645 ifa->ifa_ifp = ifp; 646 ifa->ifa_rtrequest = link_rtrequest; 647 ifa->ifa_addr = (struct sockaddr *)sdl; 648 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 649 ifa->ifa_netmask = (struct sockaddr *)sdl; 650 sdl->sdl_len = masklen; 651 while (namelen != 0) 652 sdl->sdl_data[--namelen] = 0xff; 653 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 654 /* Reliably crash if used uninitialized. */ 655 ifp->if_broadcastaddr = NULL; 656 657 #if defined(INET) || defined(INET6) 658 /* Initialize to max value. */ 659 if (ifp->if_hw_tsomax == 0) 660 ifp->if_hw_tsomax = IP_MAXPACKET; 661 KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET && 662 ifp->if_hw_tsomax >= IP_MAXPACKET / 8, 663 ("%s: tsomax outside of range", __func__)); 664 #endif 665 } 666 #ifdef VIMAGE 667 else { 668 /* 669 * Update the interface index in the link layer address 670 * of the interface. 671 */ 672 for (ifa = ifp->if_addr; ifa != NULL; 673 ifa = TAILQ_NEXT(ifa, ifa_link)) { 674 if (ifa->ifa_addr->sa_family == AF_LINK) { 675 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 676 sdl->sdl_index = ifp->if_index; 677 } 678 } 679 } 680 #endif 681 682 IFNET_WLOCK(); 683 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 684 #ifdef VIMAGE 685 curvnet->vnet_ifcnt++; 686 #endif 687 IFNET_WUNLOCK(); 688 689 if (domain_init_status >= 2) 690 if_attachdomain1(ifp); 691 692 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 693 if (IS_DEFAULT_VNET(curvnet)) 694 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 695 696 /* Announce the interface. */ 697 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 698 } 699 700 static void 701 if_attachdomain(void *dummy) 702 { 703 struct ifnet *ifp; 704 705 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 706 if_attachdomain1(ifp); 707 } 708 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 709 if_attachdomain, NULL); 710 711 static void 712 if_attachdomain1(struct ifnet *ifp) 713 { 714 struct domain *dp; 715 716 /* 717 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 718 * cannot lock ifp->if_afdata initialization, entirely. 719 */ 720 if (IF_AFDATA_TRYLOCK(ifp) == 0) 721 return; 722 if (ifp->if_afdata_initialized >= domain_init_status) { 723 IF_AFDATA_UNLOCK(ifp); 724 log(LOG_WARNING, "%s called more than once on %s\n", 725 __func__, ifp->if_xname); 726 return; 727 } 728 ifp->if_afdata_initialized = domain_init_status; 729 IF_AFDATA_UNLOCK(ifp); 730 731 /* address family dependent data region */ 732 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 733 for (dp = domains; dp; dp = dp->dom_next) { 734 if (dp->dom_ifattach) 735 ifp->if_afdata[dp->dom_family] = 736 (*dp->dom_ifattach)(ifp); 737 } 738 } 739 740 /* 741 * Remove any unicast or broadcast network addresses from an interface. 742 */ 743 void 744 if_purgeaddrs(struct ifnet *ifp) 745 { 746 struct ifaddr *ifa, *next; 747 748 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 749 if (ifa->ifa_addr->sa_family == AF_LINK) 750 continue; 751 #ifdef INET 752 /* XXX: Ugly!! ad hoc just for INET */ 753 if (ifa->ifa_addr->sa_family == AF_INET) { 754 struct ifaliasreq ifr; 755 756 bzero(&ifr, sizeof(ifr)); 757 ifr.ifra_addr = *ifa->ifa_addr; 758 if (ifa->ifa_dstaddr) 759 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 760 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 761 NULL) == 0) 762 continue; 763 } 764 #endif /* INET */ 765 #ifdef INET6 766 if (ifa->ifa_addr->sa_family == AF_INET6) { 767 in6_purgeaddr(ifa); 768 /* ifp_addrhead is already updated */ 769 continue; 770 } 771 #endif /* INET6 */ 772 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 773 ifa_free(ifa); 774 } 775 } 776 777 /* 778 * Remove any multicast network addresses from an interface when an ifnet 779 * is going away. 780 */ 781 static void 782 if_purgemaddrs(struct ifnet *ifp) 783 { 784 struct ifmultiaddr *ifma; 785 struct ifmultiaddr *next; 786 787 IF_ADDR_WLOCK(ifp); 788 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 789 if_delmulti_locked(ifp, ifma, 1); 790 IF_ADDR_WUNLOCK(ifp); 791 } 792 793 /* 794 * Detach an interface, removing it from the list of "active" interfaces. 795 * If vmove flag is set on entry to if_detach_internal(), perform only a 796 * limited subset of cleanup tasks, given that we are moving an ifnet from 797 * one vnet to another, where it must be fully operational. 798 * 799 * XXXRW: There are some significant questions about event ordering, and 800 * how to prevent things from starting to use the interface during detach. 801 */ 802 void 803 if_detach(struct ifnet *ifp) 804 { 805 806 if_detach_internal(ifp, 0); 807 } 808 809 static void 810 if_detach_internal(struct ifnet *ifp, int vmove) 811 { 812 struct ifaddr *ifa; 813 struct radix_node_head *rnh; 814 int i, j; 815 struct domain *dp; 816 struct ifnet *iter; 817 int found = 0; 818 819 IFNET_WLOCK(); 820 TAILQ_FOREACH(iter, &V_ifnet, if_link) 821 if (iter == ifp) { 822 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 823 found = 1; 824 break; 825 } 826 #ifdef VIMAGE 827 if (found) 828 curvnet->vnet_ifcnt--; 829 #endif 830 IFNET_WUNLOCK(); 831 if (!found) { 832 if (vmove) 833 panic("%s: ifp=%p not on the ifnet tailq %p", 834 __func__, ifp, &V_ifnet); 835 else 836 return; /* XXX this should panic as well? */ 837 } 838 839 /* 840 * Remove/wait for pending events. 841 */ 842 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 843 844 /* 845 * Remove routes and flush queues. 846 */ 847 if_down(ifp); 848 #ifdef ALTQ 849 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 850 altq_disable(&ifp->if_snd); 851 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 852 altq_detach(&ifp->if_snd); 853 #endif 854 855 if_purgeaddrs(ifp); 856 857 #ifdef INET 858 in_ifdetach(ifp); 859 #endif 860 861 #ifdef INET6 862 /* 863 * Remove all IPv6 kernel structs related to ifp. This should be done 864 * before removing routing entries below, since IPv6 interface direct 865 * routes are expected to be removed by the IPv6-specific kernel API. 866 * Otherwise, the kernel will detect some inconsistency and bark it. 867 */ 868 in6_ifdetach(ifp); 869 #endif 870 if_purgemaddrs(ifp); 871 872 if (!vmove) { 873 /* 874 * Prevent further calls into the device driver via ifnet. 875 */ 876 if_dead(ifp); 877 878 /* 879 * Remove link ifaddr pointer and maybe decrement if_index. 880 * Clean up all addresses. 881 */ 882 ifp->if_addr = NULL; 883 884 /* We can now free link ifaddr. */ 885 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 886 ifa = TAILQ_FIRST(&ifp->if_addrhead); 887 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 888 ifa_free(ifa); 889 } 890 } 891 892 /* 893 * Delete all remaining routes using this interface 894 * Unfortuneatly the only way to do this is to slog through 895 * the entire routing table looking for routes which point 896 * to this interface...oh well... 897 */ 898 for (i = 1; i <= AF_MAX; i++) { 899 for (j = 0; j < rt_numfibs; j++) { 900 rnh = rt_tables_get_rnh(j, i); 901 if (rnh == NULL) 902 continue; 903 RADIX_NODE_HEAD_LOCK(rnh); 904 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 905 RADIX_NODE_HEAD_UNLOCK(rnh); 906 } 907 } 908 909 /* Announce that the interface is gone. */ 910 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 911 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 912 if (IS_DEFAULT_VNET(curvnet)) 913 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 914 if_delgroups(ifp); 915 916 /* 917 * We cannot hold the lock over dom_ifdetach calls as they might 918 * sleep, for example trying to drain a callout, thus open up the 919 * theoretical race with re-attaching. 920 */ 921 IF_AFDATA_LOCK(ifp); 922 i = ifp->if_afdata_initialized; 923 ifp->if_afdata_initialized = 0; 924 IF_AFDATA_UNLOCK(ifp); 925 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 926 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 927 (*dp->dom_ifdetach)(ifp, 928 ifp->if_afdata[dp->dom_family]); 929 } 930 } 931 932 #ifdef VIMAGE 933 /* 934 * if_vmove() performs a limited version of if_detach() in current 935 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 936 * An attempt is made to shrink if_index in current vnet, find an 937 * unused if_index in target vnet and calls if_grow() if necessary, 938 * and finally find an unused if_xname for the target vnet. 939 */ 940 void 941 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 942 { 943 u_short idx; 944 945 /* 946 * Detach from current vnet, but preserve LLADDR info, do not 947 * mark as dead etc. so that the ifnet can be reattached later. 948 */ 949 if_detach_internal(ifp, 1); 950 951 /* 952 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 953 * the if_index for that vnet if possible. 954 * 955 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 956 * or we'd lock on one vnet and unlock on another. 957 */ 958 IFNET_WLOCK(); 959 ifindex_free_locked(ifp->if_index); 960 IFNET_WUNLOCK(); 961 962 /* 963 * Perform interface-specific reassignment tasks, if provided by 964 * the driver. 965 */ 966 if (ifp->if_reassign != NULL) 967 ifp->if_reassign(ifp, new_vnet, NULL); 968 969 /* 970 * Switch to the context of the target vnet. 971 */ 972 CURVNET_SET_QUIET(new_vnet); 973 974 IFNET_WLOCK(); 975 if (ifindex_alloc_locked(&idx) != 0) { 976 IFNET_WUNLOCK(); 977 panic("if_index overflow"); 978 } 979 ifp->if_index = idx; 980 ifnet_setbyindex_locked(ifp->if_index, ifp); 981 IFNET_WUNLOCK(); 982 983 if_attach_internal(ifp, 1); 984 985 CURVNET_RESTORE(); 986 } 987 988 /* 989 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 990 */ 991 static int 992 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 993 { 994 struct prison *pr; 995 struct ifnet *difp; 996 997 /* Try to find the prison within our visibility. */ 998 sx_slock(&allprison_lock); 999 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1000 sx_sunlock(&allprison_lock); 1001 if (pr == NULL) 1002 return (ENXIO); 1003 prison_hold_locked(pr); 1004 mtx_unlock(&pr->pr_mtx); 1005 1006 /* Do not try to move the iface from and to the same prison. */ 1007 if (pr->pr_vnet == ifp->if_vnet) { 1008 prison_free(pr); 1009 return (EEXIST); 1010 } 1011 1012 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1013 /* XXX Lock interfaces to avoid races. */ 1014 CURVNET_SET_QUIET(pr->pr_vnet); 1015 difp = ifunit(ifname); 1016 CURVNET_RESTORE(); 1017 if (difp != NULL) { 1018 prison_free(pr); 1019 return (EEXIST); 1020 } 1021 1022 /* Move the interface into the child jail/vnet. */ 1023 if_vmove(ifp, pr->pr_vnet); 1024 1025 /* Report the new if_xname back to the userland. */ 1026 sprintf(ifname, "%s", ifp->if_xname); 1027 1028 prison_free(pr); 1029 return (0); 1030 } 1031 1032 static int 1033 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1034 { 1035 struct prison *pr; 1036 struct vnet *vnet_dst; 1037 struct ifnet *ifp; 1038 1039 /* Try to find the prison within our visibility. */ 1040 sx_slock(&allprison_lock); 1041 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1042 sx_sunlock(&allprison_lock); 1043 if (pr == NULL) 1044 return (ENXIO); 1045 prison_hold_locked(pr); 1046 mtx_unlock(&pr->pr_mtx); 1047 1048 /* Make sure the named iface exists in the source prison/vnet. */ 1049 CURVNET_SET(pr->pr_vnet); 1050 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1051 if (ifp == NULL) { 1052 CURVNET_RESTORE(); 1053 prison_free(pr); 1054 return (ENXIO); 1055 } 1056 1057 /* Do not try to move the iface from and to the same prison. */ 1058 vnet_dst = TD_TO_VNET(td); 1059 if (vnet_dst == ifp->if_vnet) { 1060 CURVNET_RESTORE(); 1061 prison_free(pr); 1062 return (EEXIST); 1063 } 1064 1065 /* Get interface back from child jail/vnet. */ 1066 if_vmove(ifp, vnet_dst); 1067 CURVNET_RESTORE(); 1068 1069 /* Report the new if_xname back to the userland. */ 1070 sprintf(ifname, "%s", ifp->if_xname); 1071 1072 prison_free(pr); 1073 return (0); 1074 } 1075 #endif /* VIMAGE */ 1076 1077 /* 1078 * Add a group to an interface 1079 */ 1080 int 1081 if_addgroup(struct ifnet *ifp, const char *groupname) 1082 { 1083 struct ifg_list *ifgl; 1084 struct ifg_group *ifg = NULL; 1085 struct ifg_member *ifgm; 1086 int new = 0; 1087 1088 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1089 groupname[strlen(groupname) - 1] <= '9') 1090 return (EINVAL); 1091 1092 IFNET_WLOCK(); 1093 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1094 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1095 IFNET_WUNLOCK(); 1096 return (EEXIST); 1097 } 1098 1099 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1100 M_NOWAIT)) == NULL) { 1101 IFNET_WUNLOCK(); 1102 return (ENOMEM); 1103 } 1104 1105 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1106 M_TEMP, M_NOWAIT)) == NULL) { 1107 free(ifgl, M_TEMP); 1108 IFNET_WUNLOCK(); 1109 return (ENOMEM); 1110 } 1111 1112 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1113 if (!strcmp(ifg->ifg_group, groupname)) 1114 break; 1115 1116 if (ifg == NULL) { 1117 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1118 M_TEMP, M_NOWAIT)) == NULL) { 1119 free(ifgl, M_TEMP); 1120 free(ifgm, M_TEMP); 1121 IFNET_WUNLOCK(); 1122 return (ENOMEM); 1123 } 1124 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1125 ifg->ifg_refcnt = 0; 1126 TAILQ_INIT(&ifg->ifg_members); 1127 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1128 new = 1; 1129 } 1130 1131 ifg->ifg_refcnt++; 1132 ifgl->ifgl_group = ifg; 1133 ifgm->ifgm_ifp = ifp; 1134 1135 IF_ADDR_WLOCK(ifp); 1136 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1137 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1138 IF_ADDR_WUNLOCK(ifp); 1139 1140 IFNET_WUNLOCK(); 1141 1142 if (new) 1143 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1144 EVENTHANDLER_INVOKE(group_change_event, groupname); 1145 1146 return (0); 1147 } 1148 1149 /* 1150 * Remove a group from an interface 1151 */ 1152 int 1153 if_delgroup(struct ifnet *ifp, const char *groupname) 1154 { 1155 struct ifg_list *ifgl; 1156 struct ifg_member *ifgm; 1157 1158 IFNET_WLOCK(); 1159 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1160 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1161 break; 1162 if (ifgl == NULL) { 1163 IFNET_WUNLOCK(); 1164 return (ENOENT); 1165 } 1166 1167 IF_ADDR_WLOCK(ifp); 1168 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1169 IF_ADDR_WUNLOCK(ifp); 1170 1171 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1172 if (ifgm->ifgm_ifp == ifp) 1173 break; 1174 1175 if (ifgm != NULL) { 1176 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1177 free(ifgm, M_TEMP); 1178 } 1179 1180 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1181 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1182 IFNET_WUNLOCK(); 1183 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1184 free(ifgl->ifgl_group, M_TEMP); 1185 } else 1186 IFNET_WUNLOCK(); 1187 1188 free(ifgl, M_TEMP); 1189 1190 EVENTHANDLER_INVOKE(group_change_event, groupname); 1191 1192 return (0); 1193 } 1194 1195 /* 1196 * Remove an interface from all groups 1197 */ 1198 static void 1199 if_delgroups(struct ifnet *ifp) 1200 { 1201 struct ifg_list *ifgl; 1202 struct ifg_member *ifgm; 1203 char groupname[IFNAMSIZ]; 1204 1205 IFNET_WLOCK(); 1206 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1207 ifgl = TAILQ_FIRST(&ifp->if_groups); 1208 1209 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1210 1211 IF_ADDR_WLOCK(ifp); 1212 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1213 IF_ADDR_WUNLOCK(ifp); 1214 1215 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1216 if (ifgm->ifgm_ifp == ifp) 1217 break; 1218 1219 if (ifgm != NULL) { 1220 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1221 ifgm_next); 1222 free(ifgm, M_TEMP); 1223 } 1224 1225 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1226 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1227 IFNET_WUNLOCK(); 1228 EVENTHANDLER_INVOKE(group_detach_event, 1229 ifgl->ifgl_group); 1230 free(ifgl->ifgl_group, M_TEMP); 1231 } else 1232 IFNET_WUNLOCK(); 1233 1234 free(ifgl, M_TEMP); 1235 1236 EVENTHANDLER_INVOKE(group_change_event, groupname); 1237 1238 IFNET_WLOCK(); 1239 } 1240 IFNET_WUNLOCK(); 1241 } 1242 1243 /* 1244 * Stores all groups from an interface in memory pointed 1245 * to by data 1246 */ 1247 static int 1248 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1249 { 1250 int len, error; 1251 struct ifg_list *ifgl; 1252 struct ifg_req ifgrq, *ifgp; 1253 struct ifgroupreq *ifgr = data; 1254 1255 if (ifgr->ifgr_len == 0) { 1256 IF_ADDR_RLOCK(ifp); 1257 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1258 ifgr->ifgr_len += sizeof(struct ifg_req); 1259 IF_ADDR_RUNLOCK(ifp); 1260 return (0); 1261 } 1262 1263 len = ifgr->ifgr_len; 1264 ifgp = ifgr->ifgr_groups; 1265 /* XXX: wire */ 1266 IF_ADDR_RLOCK(ifp); 1267 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1268 if (len < sizeof(ifgrq)) { 1269 IF_ADDR_RUNLOCK(ifp); 1270 return (EINVAL); 1271 } 1272 bzero(&ifgrq, sizeof ifgrq); 1273 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1274 sizeof(ifgrq.ifgrq_group)); 1275 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1276 IF_ADDR_RUNLOCK(ifp); 1277 return (error); 1278 } 1279 len -= sizeof(ifgrq); 1280 ifgp++; 1281 } 1282 IF_ADDR_RUNLOCK(ifp); 1283 1284 return (0); 1285 } 1286 1287 /* 1288 * Stores all members of a group in memory pointed to by data 1289 */ 1290 static int 1291 if_getgroupmembers(struct ifgroupreq *data) 1292 { 1293 struct ifgroupreq *ifgr = data; 1294 struct ifg_group *ifg; 1295 struct ifg_member *ifgm; 1296 struct ifg_req ifgrq, *ifgp; 1297 int len, error; 1298 1299 IFNET_RLOCK(); 1300 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1301 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1302 break; 1303 if (ifg == NULL) { 1304 IFNET_RUNLOCK(); 1305 return (ENOENT); 1306 } 1307 1308 if (ifgr->ifgr_len == 0) { 1309 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1310 ifgr->ifgr_len += sizeof(ifgrq); 1311 IFNET_RUNLOCK(); 1312 return (0); 1313 } 1314 1315 len = ifgr->ifgr_len; 1316 ifgp = ifgr->ifgr_groups; 1317 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1318 if (len < sizeof(ifgrq)) { 1319 IFNET_RUNLOCK(); 1320 return (EINVAL); 1321 } 1322 bzero(&ifgrq, sizeof ifgrq); 1323 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1324 sizeof(ifgrq.ifgrq_member)); 1325 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1326 IFNET_RUNLOCK(); 1327 return (error); 1328 } 1329 len -= sizeof(ifgrq); 1330 ifgp++; 1331 } 1332 IFNET_RUNLOCK(); 1333 1334 return (0); 1335 } 1336 1337 /* 1338 * Delete Routes for a Network Interface 1339 * 1340 * Called for each routing entry via the rnh->rnh_walktree() call above 1341 * to delete all route entries referencing a detaching network interface. 1342 * 1343 * Arguments: 1344 * rn pointer to node in the routing table 1345 * arg argument passed to rnh->rnh_walktree() - detaching interface 1346 * 1347 * Returns: 1348 * 0 successful 1349 * errno failed - reason indicated 1350 * 1351 */ 1352 static int 1353 if_rtdel(struct radix_node *rn, void *arg) 1354 { 1355 struct rtentry *rt = (struct rtentry *)rn; 1356 struct ifnet *ifp = arg; 1357 int err; 1358 1359 if (rt->rt_ifp == ifp) { 1360 1361 /* 1362 * Protect (sorta) against walktree recursion problems 1363 * with cloned routes 1364 */ 1365 if ((rt->rt_flags & RTF_UP) == 0) 1366 return (0); 1367 1368 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1369 rt_mask(rt), 1370 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1371 (struct rtentry **) NULL, rt->rt_fibnum); 1372 if (err) { 1373 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1374 } 1375 } 1376 1377 return (0); 1378 } 1379 1380 /* 1381 * Wrapper functions for struct ifnet address list locking macros. These are 1382 * used by kernel modules to avoid encoding programming interface or binary 1383 * interface assumptions that may be violated when kernel-internal locking 1384 * approaches change. 1385 */ 1386 void 1387 if_addr_rlock(struct ifnet *ifp) 1388 { 1389 1390 IF_ADDR_RLOCK(ifp); 1391 } 1392 1393 void 1394 if_addr_runlock(struct ifnet *ifp) 1395 { 1396 1397 IF_ADDR_RUNLOCK(ifp); 1398 } 1399 1400 void 1401 if_maddr_rlock(struct ifnet *ifp) 1402 { 1403 1404 IF_ADDR_RLOCK(ifp); 1405 } 1406 1407 void 1408 if_maddr_runlock(struct ifnet *ifp) 1409 { 1410 1411 IF_ADDR_RUNLOCK(ifp); 1412 } 1413 1414 /* 1415 * Initialization, destruction and refcounting functions for ifaddrs. 1416 */ 1417 void 1418 ifa_init(struct ifaddr *ifa) 1419 { 1420 1421 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1422 refcount_init(&ifa->ifa_refcnt, 1); 1423 ifa->if_data.ifi_datalen = sizeof(ifa->if_data); 1424 } 1425 1426 void 1427 ifa_ref(struct ifaddr *ifa) 1428 { 1429 1430 refcount_acquire(&ifa->ifa_refcnt); 1431 } 1432 1433 void 1434 ifa_free(struct ifaddr *ifa) 1435 { 1436 1437 if (refcount_release(&ifa->ifa_refcnt)) { 1438 mtx_destroy(&ifa->ifa_mtx); 1439 free(ifa, M_IFADDR); 1440 } 1441 } 1442 1443 int 1444 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1445 { 1446 int error = 0; 1447 struct rtentry *rt = NULL; 1448 struct rt_addrinfo info; 1449 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1450 1451 bzero(&info, sizeof(info)); 1452 info.rti_ifp = V_loif; 1453 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1454 info.rti_info[RTAX_DST] = ia; 1455 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1456 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1457 1458 if (error == 0 && rt != NULL) { 1459 RT_LOCK(rt); 1460 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1461 ifa->ifa_ifp->if_type; 1462 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1463 ifa->ifa_ifp->if_index; 1464 RT_REMREF(rt); 1465 RT_UNLOCK(rt); 1466 } else if (error != 0) 1467 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1468 1469 return (error); 1470 } 1471 1472 int 1473 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1474 { 1475 int error = 0; 1476 struct rt_addrinfo info; 1477 struct sockaddr_dl null_sdl; 1478 1479 bzero(&null_sdl, sizeof(null_sdl)); 1480 null_sdl.sdl_len = sizeof(null_sdl); 1481 null_sdl.sdl_family = AF_LINK; 1482 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1483 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1484 bzero(&info, sizeof(info)); 1485 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1486 info.rti_info[RTAX_DST] = ia; 1487 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1488 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1489 1490 if (error != 0) 1491 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1492 1493 return (error); 1494 } 1495 1496 /* 1497 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1498 * structs used to represent other address families, it is necessary 1499 * to perform a different comparison. 1500 */ 1501 1502 #define sa_equal(a1, a2) \ 1503 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1504 1505 #define sa_dl_equal(a1, a2) \ 1506 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1507 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1508 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1509 LLADDR((struct sockaddr_dl *)(a2)), \ 1510 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1511 1512 /* 1513 * Locate an interface based on a complete address. 1514 */ 1515 /*ARGSUSED*/ 1516 static struct ifaddr * 1517 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1518 { 1519 struct ifnet *ifp; 1520 struct ifaddr *ifa; 1521 1522 IFNET_RLOCK_NOSLEEP(); 1523 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1524 IF_ADDR_RLOCK(ifp); 1525 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1526 if (ifa->ifa_addr->sa_family != addr->sa_family) 1527 continue; 1528 if (sa_equal(addr, ifa->ifa_addr)) { 1529 if (getref) 1530 ifa_ref(ifa); 1531 IF_ADDR_RUNLOCK(ifp); 1532 goto done; 1533 } 1534 /* IP6 doesn't have broadcast */ 1535 if ((ifp->if_flags & IFF_BROADCAST) && 1536 ifa->ifa_broadaddr && 1537 ifa->ifa_broadaddr->sa_len != 0 && 1538 sa_equal(ifa->ifa_broadaddr, addr)) { 1539 if (getref) 1540 ifa_ref(ifa); 1541 IF_ADDR_RUNLOCK(ifp); 1542 goto done; 1543 } 1544 } 1545 IF_ADDR_RUNLOCK(ifp); 1546 } 1547 ifa = NULL; 1548 done: 1549 IFNET_RUNLOCK_NOSLEEP(); 1550 return (ifa); 1551 } 1552 1553 struct ifaddr * 1554 ifa_ifwithaddr(struct sockaddr *addr) 1555 { 1556 1557 return (ifa_ifwithaddr_internal(addr, 1)); 1558 } 1559 1560 int 1561 ifa_ifwithaddr_check(struct sockaddr *addr) 1562 { 1563 1564 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1565 } 1566 1567 /* 1568 * Locate an interface based on the broadcast address. 1569 */ 1570 /* ARGSUSED */ 1571 struct ifaddr * 1572 ifa_ifwithbroadaddr(struct sockaddr *addr) 1573 { 1574 struct ifnet *ifp; 1575 struct ifaddr *ifa; 1576 1577 IFNET_RLOCK_NOSLEEP(); 1578 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1579 IF_ADDR_RLOCK(ifp); 1580 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1581 if (ifa->ifa_addr->sa_family != addr->sa_family) 1582 continue; 1583 if ((ifp->if_flags & IFF_BROADCAST) && 1584 ifa->ifa_broadaddr && 1585 ifa->ifa_broadaddr->sa_len != 0 && 1586 sa_equal(ifa->ifa_broadaddr, addr)) { 1587 ifa_ref(ifa); 1588 IF_ADDR_RUNLOCK(ifp); 1589 goto done; 1590 } 1591 } 1592 IF_ADDR_RUNLOCK(ifp); 1593 } 1594 ifa = NULL; 1595 done: 1596 IFNET_RUNLOCK_NOSLEEP(); 1597 return (ifa); 1598 } 1599 1600 /* 1601 * Locate the point to point interface with a given destination address. 1602 */ 1603 /*ARGSUSED*/ 1604 struct ifaddr * 1605 ifa_ifwithdstaddr(struct sockaddr *addr) 1606 { 1607 struct ifnet *ifp; 1608 struct ifaddr *ifa; 1609 1610 IFNET_RLOCK_NOSLEEP(); 1611 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1612 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1613 continue; 1614 IF_ADDR_RLOCK(ifp); 1615 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1616 if (ifa->ifa_addr->sa_family != addr->sa_family) 1617 continue; 1618 if (ifa->ifa_dstaddr != NULL && 1619 sa_equal(addr, ifa->ifa_dstaddr)) { 1620 ifa_ref(ifa); 1621 IF_ADDR_RUNLOCK(ifp); 1622 goto done; 1623 } 1624 } 1625 IF_ADDR_RUNLOCK(ifp); 1626 } 1627 ifa = NULL; 1628 done: 1629 IFNET_RUNLOCK_NOSLEEP(); 1630 return (ifa); 1631 } 1632 1633 /* 1634 * Find an interface on a specific network. If many, choice 1635 * is most specific found. 1636 */ 1637 struct ifaddr * 1638 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1639 { 1640 struct ifnet *ifp; 1641 struct ifaddr *ifa; 1642 struct ifaddr *ifa_maybe = NULL; 1643 u_int af = addr->sa_family; 1644 char *addr_data = addr->sa_data, *cplim; 1645 1646 /* 1647 * AF_LINK addresses can be looked up directly by their index number, 1648 * so do that if we can. 1649 */ 1650 if (af == AF_LINK) { 1651 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1652 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1653 return (ifaddr_byindex(sdl->sdl_index)); 1654 } 1655 1656 /* 1657 * Scan though each interface, looking for ones that have addresses 1658 * in this address family. Maintain a reference on ifa_maybe once 1659 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1660 * when we move onto the next interface. 1661 */ 1662 IFNET_RLOCK_NOSLEEP(); 1663 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1664 IF_ADDR_RLOCK(ifp); 1665 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1666 char *cp, *cp2, *cp3; 1667 1668 if (ifa->ifa_addr->sa_family != af) 1669 next: continue; 1670 if (af == AF_INET && 1671 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1672 /* 1673 * This is a bit broken as it doesn't 1674 * take into account that the remote end may 1675 * be a single node in the network we are 1676 * looking for. 1677 * The trouble is that we don't know the 1678 * netmask for the remote end. 1679 */ 1680 if (ifa->ifa_dstaddr != NULL && 1681 sa_equal(addr, ifa->ifa_dstaddr)) { 1682 ifa_ref(ifa); 1683 IF_ADDR_RUNLOCK(ifp); 1684 goto done; 1685 } 1686 } else { 1687 /* 1688 * if we have a special address handler, 1689 * then use it instead of the generic one. 1690 */ 1691 if (ifa->ifa_claim_addr) { 1692 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1693 ifa_ref(ifa); 1694 IF_ADDR_RUNLOCK(ifp); 1695 goto done; 1696 } 1697 continue; 1698 } 1699 1700 /* 1701 * Scan all the bits in the ifa's address. 1702 * If a bit dissagrees with what we are 1703 * looking for, mask it with the netmask 1704 * to see if it really matters. 1705 * (A byte at a time) 1706 */ 1707 if (ifa->ifa_netmask == 0) 1708 continue; 1709 cp = addr_data; 1710 cp2 = ifa->ifa_addr->sa_data; 1711 cp3 = ifa->ifa_netmask->sa_data; 1712 cplim = ifa->ifa_netmask->sa_len 1713 + (char *)ifa->ifa_netmask; 1714 while (cp3 < cplim) 1715 if ((*cp++ ^ *cp2++) & *cp3++) 1716 goto next; /* next address! */ 1717 /* 1718 * If the netmask of what we just found 1719 * is more specific than what we had before 1720 * (if we had one), or if the virtual status 1721 * of new prefix is better than of the old one, 1722 * then remember the new one before continuing 1723 * to search for an even better one. 1724 */ 1725 if (ifa_maybe == NULL || 1726 ifa_preferred(ifa_maybe, ifa) || 1727 rn_refines((caddr_t)ifa->ifa_netmask, 1728 (caddr_t)ifa_maybe->ifa_netmask)) { 1729 if (ifa_maybe != NULL) 1730 ifa_free(ifa_maybe); 1731 ifa_maybe = ifa; 1732 ifa_ref(ifa_maybe); 1733 } 1734 } 1735 } 1736 IF_ADDR_RUNLOCK(ifp); 1737 } 1738 ifa = ifa_maybe; 1739 ifa_maybe = NULL; 1740 done: 1741 IFNET_RUNLOCK_NOSLEEP(); 1742 if (ifa_maybe != NULL) 1743 ifa_free(ifa_maybe); 1744 return (ifa); 1745 } 1746 1747 /* 1748 * Find an interface address specific to an interface best matching 1749 * a given address. 1750 */ 1751 struct ifaddr * 1752 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1753 { 1754 struct ifaddr *ifa; 1755 char *cp, *cp2, *cp3; 1756 char *cplim; 1757 struct ifaddr *ifa_maybe = NULL; 1758 u_int af = addr->sa_family; 1759 1760 if (af >= AF_MAX) 1761 return (NULL); 1762 IF_ADDR_RLOCK(ifp); 1763 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1764 if (ifa->ifa_addr->sa_family != af) 1765 continue; 1766 if (ifa_maybe == NULL) 1767 ifa_maybe = ifa; 1768 if (ifa->ifa_netmask == 0) { 1769 if (sa_equal(addr, ifa->ifa_addr) || 1770 (ifa->ifa_dstaddr && 1771 sa_equal(addr, ifa->ifa_dstaddr))) 1772 goto done; 1773 continue; 1774 } 1775 if (ifp->if_flags & IFF_POINTOPOINT) { 1776 if (sa_equal(addr, ifa->ifa_dstaddr)) 1777 goto done; 1778 } else { 1779 cp = addr->sa_data; 1780 cp2 = ifa->ifa_addr->sa_data; 1781 cp3 = ifa->ifa_netmask->sa_data; 1782 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1783 for (; cp3 < cplim; cp3++) 1784 if ((*cp++ ^ *cp2++) & *cp3) 1785 break; 1786 if (cp3 == cplim) 1787 goto done; 1788 } 1789 } 1790 ifa = ifa_maybe; 1791 done: 1792 if (ifa != NULL) 1793 ifa_ref(ifa); 1794 IF_ADDR_RUNLOCK(ifp); 1795 return (ifa); 1796 } 1797 1798 /* 1799 * See whether new ifa is better than current one: 1800 * 1) A non-virtual one is preferred over virtual. 1801 * 2) A virtual in master state preferred over any other state. 1802 * 1803 * Used in several address selecting functions. 1804 */ 1805 int 1806 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 1807 { 1808 1809 return (cur->ifa_carp && (!next->ifa_carp || 1810 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 1811 } 1812 1813 #include <net/if_llatbl.h> 1814 1815 /* 1816 * Default action when installing a route with a Link Level gateway. 1817 * Lookup an appropriate real ifa to point to. 1818 * This should be moved to /sys/net/link.c eventually. 1819 */ 1820 static void 1821 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1822 { 1823 struct ifaddr *ifa, *oifa; 1824 struct sockaddr *dst; 1825 struct ifnet *ifp; 1826 1827 RT_LOCK_ASSERT(rt); 1828 1829 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1830 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1831 return; 1832 ifa = ifaof_ifpforaddr(dst, ifp); 1833 if (ifa) { 1834 oifa = rt->rt_ifa; 1835 rt->rt_ifa = ifa; 1836 ifa_free(oifa); 1837 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1838 ifa->ifa_rtrequest(cmd, rt, info); 1839 } 1840 } 1841 1842 /* 1843 * Mark an interface down and notify protocols of 1844 * the transition. 1845 */ 1846 static void 1847 if_unroute(struct ifnet *ifp, int flag, int fam) 1848 { 1849 struct ifaddr *ifa; 1850 1851 KASSERT(flag == IFF_UP, ("if_unroute: 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_IFDOWN, ifa->ifa_addr); 1858 ifp->if_qflush(ifp); 1859 1860 if (ifp->if_carp) 1861 (*carp_linkstate_p)(ifp); 1862 rt_ifmsg(ifp); 1863 } 1864 1865 /* 1866 * Mark an interface up and notify protocols of 1867 * the transition. 1868 */ 1869 static void 1870 if_route(struct ifnet *ifp, int flag, int fam) 1871 { 1872 struct ifaddr *ifa; 1873 1874 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1875 1876 ifp->if_flags |= flag; 1877 getmicrotime(&ifp->if_lastchange); 1878 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1879 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1880 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1881 if (ifp->if_carp) 1882 (*carp_linkstate_p)(ifp); 1883 rt_ifmsg(ifp); 1884 #ifdef INET6 1885 in6_if_up(ifp); 1886 #endif 1887 } 1888 1889 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1890 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1891 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1892 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1893 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1894 int (*vlan_setcookie_p)(struct ifnet *, void *); 1895 void *(*vlan_cookie_p)(struct ifnet *); 1896 1897 /* 1898 * Handle a change in the interface link state. To avoid LORs 1899 * between driver lock and upper layer locks, as well as possible 1900 * recursions, we post event to taskqueue, and all job 1901 * is done in static do_link_state_change(). 1902 */ 1903 void 1904 if_link_state_change(struct ifnet *ifp, int link_state) 1905 { 1906 /* Return if state hasn't changed. */ 1907 if (ifp->if_link_state == link_state) 1908 return; 1909 1910 ifp->if_link_state = link_state; 1911 1912 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1913 } 1914 1915 static void 1916 do_link_state_change(void *arg, int pending) 1917 { 1918 struct ifnet *ifp = (struct ifnet *)arg; 1919 int link_state = ifp->if_link_state; 1920 CURVNET_SET(ifp->if_vnet); 1921 1922 /* Notify that the link state has changed. */ 1923 rt_ifmsg(ifp); 1924 if (ifp->if_vlantrunk != NULL) 1925 (*vlan_link_state_p)(ifp); 1926 1927 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1928 IFP2AC(ifp)->ac_netgraph != NULL) 1929 (*ng_ether_link_state_p)(ifp, link_state); 1930 if (ifp->if_carp) 1931 (*carp_linkstate_p)(ifp); 1932 if (ifp->if_bridge) 1933 (*bridge_linkstate_p)(ifp); 1934 if (ifp->if_lagg) 1935 (*lagg_linkstate_p)(ifp, link_state); 1936 1937 if (IS_DEFAULT_VNET(curvnet)) 1938 devctl_notify("IFNET", ifp->if_xname, 1939 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1940 NULL); 1941 if (pending > 1) 1942 if_printf(ifp, "%d link states coalesced\n", pending); 1943 if (log_link_state_change) 1944 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1945 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1946 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1947 CURVNET_RESTORE(); 1948 } 1949 1950 /* 1951 * Mark an interface down and notify protocols of 1952 * the transition. 1953 */ 1954 void 1955 if_down(struct ifnet *ifp) 1956 { 1957 1958 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1959 } 1960 1961 /* 1962 * Mark an interface up and notify protocols of 1963 * the transition. 1964 */ 1965 void 1966 if_up(struct ifnet *ifp) 1967 { 1968 1969 if_route(ifp, IFF_UP, AF_UNSPEC); 1970 } 1971 1972 /* 1973 * Flush an interface queue. 1974 */ 1975 void 1976 if_qflush(struct ifnet *ifp) 1977 { 1978 struct mbuf *m, *n; 1979 struct ifaltq *ifq; 1980 1981 ifq = &ifp->if_snd; 1982 IFQ_LOCK(ifq); 1983 #ifdef ALTQ 1984 if (ALTQ_IS_ENABLED(ifq)) 1985 ALTQ_PURGE(ifq); 1986 #endif 1987 n = ifq->ifq_head; 1988 while ((m = n) != 0) { 1989 n = m->m_act; 1990 m_freem(m); 1991 } 1992 ifq->ifq_head = 0; 1993 ifq->ifq_tail = 0; 1994 ifq->ifq_len = 0; 1995 IFQ_UNLOCK(ifq); 1996 } 1997 1998 /* 1999 * Map interface name to interface structure pointer, with or without 2000 * returning a reference. 2001 */ 2002 struct ifnet * 2003 ifunit_ref(const char *name) 2004 { 2005 struct ifnet *ifp; 2006 2007 IFNET_RLOCK_NOSLEEP(); 2008 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2009 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2010 !(ifp->if_flags & IFF_DYING)) 2011 break; 2012 } 2013 if (ifp != NULL) 2014 if_ref(ifp); 2015 IFNET_RUNLOCK_NOSLEEP(); 2016 return (ifp); 2017 } 2018 2019 struct ifnet * 2020 ifunit(const char *name) 2021 { 2022 struct ifnet *ifp; 2023 2024 IFNET_RLOCK_NOSLEEP(); 2025 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2026 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2027 break; 2028 } 2029 IFNET_RUNLOCK_NOSLEEP(); 2030 return (ifp); 2031 } 2032 2033 /* 2034 * Hardware specific interface ioctls. 2035 */ 2036 static int 2037 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2038 { 2039 struct ifreq *ifr; 2040 struct ifstat *ifs; 2041 int error = 0; 2042 int new_flags, temp_flags; 2043 size_t namelen, onamelen; 2044 size_t descrlen; 2045 char *descrbuf, *odescrbuf; 2046 char new_name[IFNAMSIZ]; 2047 struct ifaddr *ifa; 2048 struct sockaddr_dl *sdl; 2049 2050 ifr = (struct ifreq *)data; 2051 switch (cmd) { 2052 case SIOCGIFINDEX: 2053 ifr->ifr_index = ifp->if_index; 2054 break; 2055 2056 case SIOCGIFFLAGS: 2057 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2058 ifr->ifr_flags = temp_flags & 0xffff; 2059 ifr->ifr_flagshigh = temp_flags >> 16; 2060 break; 2061 2062 case SIOCGIFCAP: 2063 ifr->ifr_reqcap = ifp->if_capabilities; 2064 ifr->ifr_curcap = ifp->if_capenable; 2065 break; 2066 2067 #ifdef MAC 2068 case SIOCGIFMAC: 2069 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2070 break; 2071 #endif 2072 2073 case SIOCGIFMETRIC: 2074 ifr->ifr_metric = ifp->if_metric; 2075 break; 2076 2077 case SIOCGIFMTU: 2078 ifr->ifr_mtu = ifp->if_mtu; 2079 break; 2080 2081 case SIOCGIFPHYS: 2082 ifr->ifr_phys = ifp->if_physical; 2083 break; 2084 2085 case SIOCGIFDESCR: 2086 error = 0; 2087 sx_slock(&ifdescr_sx); 2088 if (ifp->if_description == NULL) 2089 error = ENOMSG; 2090 else { 2091 /* space for terminating nul */ 2092 descrlen = strlen(ifp->if_description) + 1; 2093 if (ifr->ifr_buffer.length < descrlen) 2094 ifr->ifr_buffer.buffer = NULL; 2095 else 2096 error = copyout(ifp->if_description, 2097 ifr->ifr_buffer.buffer, descrlen); 2098 ifr->ifr_buffer.length = descrlen; 2099 } 2100 sx_sunlock(&ifdescr_sx); 2101 break; 2102 2103 case SIOCSIFDESCR: 2104 error = priv_check(td, PRIV_NET_SETIFDESCR); 2105 if (error) 2106 return (error); 2107 2108 /* 2109 * Copy only (length-1) bytes to make sure that 2110 * if_description is always nul terminated. The 2111 * length parameter is supposed to count the 2112 * terminating nul in. 2113 */ 2114 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2115 return (ENAMETOOLONG); 2116 else if (ifr->ifr_buffer.length == 0) 2117 descrbuf = NULL; 2118 else { 2119 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2120 M_WAITOK | M_ZERO); 2121 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2122 ifr->ifr_buffer.length - 1); 2123 if (error) { 2124 free(descrbuf, M_IFDESCR); 2125 break; 2126 } 2127 } 2128 2129 sx_xlock(&ifdescr_sx); 2130 odescrbuf = ifp->if_description; 2131 ifp->if_description = descrbuf; 2132 sx_xunlock(&ifdescr_sx); 2133 2134 getmicrotime(&ifp->if_lastchange); 2135 free(odescrbuf, M_IFDESCR); 2136 break; 2137 2138 case SIOCGIFFIB: 2139 ifr->ifr_fib = ifp->if_fib; 2140 break; 2141 2142 case SIOCSIFFIB: 2143 error = priv_check(td, PRIV_NET_SETIFFIB); 2144 if (error) 2145 return (error); 2146 if (ifr->ifr_fib >= rt_numfibs) 2147 return (EINVAL); 2148 2149 ifp->if_fib = ifr->ifr_fib; 2150 break; 2151 2152 case SIOCSIFFLAGS: 2153 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2154 if (error) 2155 return (error); 2156 /* 2157 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2158 * check, so we don't need special handling here yet. 2159 */ 2160 new_flags = (ifr->ifr_flags & 0xffff) | 2161 (ifr->ifr_flagshigh << 16); 2162 if (ifp->if_flags & IFF_SMART) { 2163 /* Smart drivers twiddle their own routes */ 2164 } else if (ifp->if_flags & IFF_UP && 2165 (new_flags & IFF_UP) == 0) { 2166 if_down(ifp); 2167 } else if (new_flags & IFF_UP && 2168 (ifp->if_flags & IFF_UP) == 0) { 2169 if_up(ifp); 2170 } 2171 /* See if permanently promiscuous mode bit is about to flip */ 2172 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2173 if (new_flags & IFF_PPROMISC) 2174 ifp->if_flags |= IFF_PROMISC; 2175 else if (ifp->if_pcount == 0) 2176 ifp->if_flags &= ~IFF_PROMISC; 2177 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2178 ifp->if_xname, 2179 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2180 } 2181 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2182 (new_flags &~ IFF_CANTCHANGE); 2183 if (ifp->if_ioctl) { 2184 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2185 } 2186 getmicrotime(&ifp->if_lastchange); 2187 break; 2188 2189 case SIOCSIFCAP: 2190 error = priv_check(td, PRIV_NET_SETIFCAP); 2191 if (error) 2192 return (error); 2193 if (ifp->if_ioctl == NULL) 2194 return (EOPNOTSUPP); 2195 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2196 return (EINVAL); 2197 error = (*ifp->if_ioctl)(ifp, cmd, data); 2198 if (error == 0) 2199 getmicrotime(&ifp->if_lastchange); 2200 break; 2201 2202 #ifdef MAC 2203 case SIOCSIFMAC: 2204 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2205 break; 2206 #endif 2207 2208 case SIOCSIFNAME: 2209 error = priv_check(td, PRIV_NET_SETIFNAME); 2210 if (error) 2211 return (error); 2212 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2213 if (error != 0) 2214 return (error); 2215 if (new_name[0] == '\0') 2216 return (EINVAL); 2217 if (ifunit(new_name) != NULL) 2218 return (EEXIST); 2219 2220 /* 2221 * XXX: Locking. Nothing else seems to lock if_flags, 2222 * and there are numerous other races with the 2223 * ifunit() checks not being atomic with namespace 2224 * changes (renames, vmoves, if_attach, etc). 2225 */ 2226 ifp->if_flags |= IFF_RENAMING; 2227 2228 /* Announce the departure of the interface. */ 2229 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2230 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2231 2232 log(LOG_INFO, "%s: changing name to '%s'\n", 2233 ifp->if_xname, new_name); 2234 2235 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2236 ifa = ifp->if_addr; 2237 IFA_LOCK(ifa); 2238 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2239 namelen = strlen(new_name); 2240 onamelen = sdl->sdl_nlen; 2241 /* 2242 * Move the address if needed. This is safe because we 2243 * allocate space for a name of length IFNAMSIZ when we 2244 * create this in if_attach(). 2245 */ 2246 if (namelen != onamelen) { 2247 bcopy(sdl->sdl_data + onamelen, 2248 sdl->sdl_data + namelen, sdl->sdl_alen); 2249 } 2250 bcopy(new_name, sdl->sdl_data, namelen); 2251 sdl->sdl_nlen = namelen; 2252 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2253 bzero(sdl->sdl_data, onamelen); 2254 while (namelen != 0) 2255 sdl->sdl_data[--namelen] = 0xff; 2256 IFA_UNLOCK(ifa); 2257 2258 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2259 /* Announce the return of the interface. */ 2260 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2261 2262 ifp->if_flags &= ~IFF_RENAMING; 2263 break; 2264 2265 #ifdef VIMAGE 2266 case SIOCSIFVNET: 2267 error = priv_check(td, PRIV_NET_SETIFVNET); 2268 if (error) 2269 return (error); 2270 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2271 break; 2272 #endif 2273 2274 case SIOCSIFMETRIC: 2275 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2276 if (error) 2277 return (error); 2278 ifp->if_metric = ifr->ifr_metric; 2279 getmicrotime(&ifp->if_lastchange); 2280 break; 2281 2282 case SIOCSIFPHYS: 2283 error = priv_check(td, PRIV_NET_SETIFPHYS); 2284 if (error) 2285 return (error); 2286 if (ifp->if_ioctl == NULL) 2287 return (EOPNOTSUPP); 2288 error = (*ifp->if_ioctl)(ifp, cmd, data); 2289 if (error == 0) 2290 getmicrotime(&ifp->if_lastchange); 2291 break; 2292 2293 case SIOCSIFMTU: 2294 { 2295 u_long oldmtu = ifp->if_mtu; 2296 2297 error = priv_check(td, PRIV_NET_SETIFMTU); 2298 if (error) 2299 return (error); 2300 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2301 return (EINVAL); 2302 if (ifp->if_ioctl == NULL) 2303 return (EOPNOTSUPP); 2304 error = (*ifp->if_ioctl)(ifp, cmd, data); 2305 if (error == 0) { 2306 getmicrotime(&ifp->if_lastchange); 2307 rt_ifmsg(ifp); 2308 } 2309 /* 2310 * If the link MTU changed, do network layer specific procedure. 2311 */ 2312 if (ifp->if_mtu != oldmtu) { 2313 #ifdef INET6 2314 nd6_setmtu(ifp); 2315 #endif 2316 } 2317 break; 2318 } 2319 2320 case SIOCADDMULTI: 2321 case SIOCDELMULTI: 2322 if (cmd == SIOCADDMULTI) 2323 error = priv_check(td, PRIV_NET_ADDMULTI); 2324 else 2325 error = priv_check(td, PRIV_NET_DELMULTI); 2326 if (error) 2327 return (error); 2328 2329 /* Don't allow group membership on non-multicast interfaces. */ 2330 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2331 return (EOPNOTSUPP); 2332 2333 /* Don't let users screw up protocols' entries. */ 2334 if (ifr->ifr_addr.sa_family != AF_LINK) 2335 return (EINVAL); 2336 2337 if (cmd == SIOCADDMULTI) { 2338 struct ifmultiaddr *ifma; 2339 2340 /* 2341 * Userland is only permitted to join groups once 2342 * via the if_addmulti() KPI, because it cannot hold 2343 * struct ifmultiaddr * between calls. It may also 2344 * lose a race while we check if the membership 2345 * already exists. 2346 */ 2347 IF_ADDR_RLOCK(ifp); 2348 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2349 IF_ADDR_RUNLOCK(ifp); 2350 if (ifma != NULL) 2351 error = EADDRINUSE; 2352 else 2353 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2354 } else { 2355 error = if_delmulti(ifp, &ifr->ifr_addr); 2356 } 2357 if (error == 0) 2358 getmicrotime(&ifp->if_lastchange); 2359 break; 2360 2361 case SIOCSIFPHYADDR: 2362 case SIOCDIFPHYADDR: 2363 #ifdef INET6 2364 case SIOCSIFPHYADDR_IN6: 2365 #endif 2366 case SIOCSLIFPHYADDR: 2367 case SIOCSIFMEDIA: 2368 case SIOCSIFGENERIC: 2369 error = priv_check(td, PRIV_NET_HWIOCTL); 2370 if (error) 2371 return (error); 2372 if (ifp->if_ioctl == NULL) 2373 return (EOPNOTSUPP); 2374 error = (*ifp->if_ioctl)(ifp, cmd, data); 2375 if (error == 0) 2376 getmicrotime(&ifp->if_lastchange); 2377 break; 2378 2379 case SIOCGIFSTATUS: 2380 ifs = (struct ifstat *)data; 2381 ifs->ascii[0] = '\0'; 2382 2383 case SIOCGIFPSRCADDR: 2384 case SIOCGIFPDSTADDR: 2385 case SIOCGLIFPHYADDR: 2386 case SIOCGIFMEDIA: 2387 case SIOCGIFGENERIC: 2388 if (ifp->if_ioctl == NULL) 2389 return (EOPNOTSUPP); 2390 error = (*ifp->if_ioctl)(ifp, cmd, data); 2391 break; 2392 2393 case SIOCSIFLLADDR: 2394 error = priv_check(td, PRIV_NET_SETLLADDR); 2395 if (error) 2396 return (error); 2397 error = if_setlladdr(ifp, 2398 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2399 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2400 break; 2401 2402 case SIOCAIFGROUP: 2403 { 2404 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2405 2406 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2407 if (error) 2408 return (error); 2409 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2410 return (error); 2411 break; 2412 } 2413 2414 case SIOCGIFGROUP: 2415 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2416 return (error); 2417 break; 2418 2419 case SIOCDIFGROUP: 2420 { 2421 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2422 2423 error = priv_check(td, PRIV_NET_DELIFGROUP); 2424 if (error) 2425 return (error); 2426 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2427 return (error); 2428 break; 2429 } 2430 2431 default: 2432 error = ENOIOCTL; 2433 break; 2434 } 2435 return (error); 2436 } 2437 2438 #ifdef COMPAT_FREEBSD32 2439 struct ifconf32 { 2440 int32_t ifc_len; 2441 union { 2442 uint32_t ifcu_buf; 2443 uint32_t ifcu_req; 2444 } ifc_ifcu; 2445 }; 2446 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2447 #endif 2448 2449 /* 2450 * Interface ioctls. 2451 */ 2452 int 2453 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2454 { 2455 struct ifnet *ifp; 2456 struct ifreq *ifr; 2457 int error; 2458 int oif_flags; 2459 2460 CURVNET_SET(so->so_vnet); 2461 switch (cmd) { 2462 case SIOCGIFCONF: 2463 case OSIOCGIFCONF: 2464 error = ifconf(cmd, data); 2465 CURVNET_RESTORE(); 2466 return (error); 2467 2468 #ifdef COMPAT_FREEBSD32 2469 case SIOCGIFCONF32: 2470 { 2471 struct ifconf32 *ifc32; 2472 struct ifconf ifc; 2473 2474 ifc32 = (struct ifconf32 *)data; 2475 ifc.ifc_len = ifc32->ifc_len; 2476 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2477 2478 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2479 CURVNET_RESTORE(); 2480 if (error == 0) 2481 ifc32->ifc_len = ifc.ifc_len; 2482 return (error); 2483 } 2484 #endif 2485 } 2486 ifr = (struct ifreq *)data; 2487 2488 switch (cmd) { 2489 #ifdef VIMAGE 2490 case SIOCSIFRVNET: 2491 error = priv_check(td, PRIV_NET_SETIFVNET); 2492 if (error == 0) 2493 error = if_vmove_reclaim(td, ifr->ifr_name, 2494 ifr->ifr_jid); 2495 CURVNET_RESTORE(); 2496 return (error); 2497 #endif 2498 case SIOCIFCREATE: 2499 case SIOCIFCREATE2: 2500 error = priv_check(td, PRIV_NET_IFCREATE); 2501 if (error == 0) 2502 error = if_clone_create(ifr->ifr_name, 2503 sizeof(ifr->ifr_name), 2504 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2505 CURVNET_RESTORE(); 2506 return (error); 2507 case SIOCIFDESTROY: 2508 error = priv_check(td, PRIV_NET_IFDESTROY); 2509 if (error == 0) 2510 error = if_clone_destroy(ifr->ifr_name); 2511 CURVNET_RESTORE(); 2512 return (error); 2513 2514 case SIOCIFGCLONERS: 2515 error = if_clone_list((struct if_clonereq *)data); 2516 CURVNET_RESTORE(); 2517 return (error); 2518 case SIOCGIFGMEMB: 2519 error = if_getgroupmembers((struct ifgroupreq *)data); 2520 CURVNET_RESTORE(); 2521 return (error); 2522 #if defined(INET) || defined(INET6) 2523 case SIOCSVH: 2524 case SIOCGVH: 2525 if (carp_ioctl_p == NULL) 2526 error = EPROTONOSUPPORT; 2527 else 2528 error = (*carp_ioctl_p)(ifr, cmd, td); 2529 CURVNET_RESTORE(); 2530 return (error); 2531 #endif 2532 } 2533 2534 ifp = ifunit_ref(ifr->ifr_name); 2535 if (ifp == NULL) { 2536 CURVNET_RESTORE(); 2537 return (ENXIO); 2538 } 2539 2540 error = ifhwioctl(cmd, ifp, data, td); 2541 if (error != ENOIOCTL) { 2542 if_rele(ifp); 2543 CURVNET_RESTORE(); 2544 return (error); 2545 } 2546 2547 oif_flags = ifp->if_flags; 2548 if (so->so_proto == NULL) { 2549 if_rele(ifp); 2550 CURVNET_RESTORE(); 2551 return (EOPNOTSUPP); 2552 } 2553 #ifndef COMPAT_43 2554 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2555 data, 2556 ifp, td)); 2557 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2558 error = (*ifp->if_ioctl)(ifp, cmd, data); 2559 #else 2560 { 2561 u_long ocmd = cmd; 2562 2563 switch (cmd) { 2564 2565 case SIOCSIFDSTADDR: 2566 case SIOCSIFADDR: 2567 case SIOCSIFBRDADDR: 2568 case SIOCSIFNETMASK: 2569 #if BYTE_ORDER != BIG_ENDIAN 2570 if (ifr->ifr_addr.sa_family == 0 && 2571 ifr->ifr_addr.sa_len < 16) { 2572 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2573 ifr->ifr_addr.sa_len = 16; 2574 } 2575 #else 2576 if (ifr->ifr_addr.sa_len == 0) 2577 ifr->ifr_addr.sa_len = 16; 2578 #endif 2579 break; 2580 2581 case OSIOCGIFADDR: 2582 cmd = SIOCGIFADDR; 2583 break; 2584 2585 case OSIOCGIFDSTADDR: 2586 cmd = SIOCGIFDSTADDR; 2587 break; 2588 2589 case OSIOCGIFBRDADDR: 2590 cmd = SIOCGIFBRDADDR; 2591 break; 2592 2593 case OSIOCGIFNETMASK: 2594 cmd = SIOCGIFNETMASK; 2595 } 2596 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2597 cmd, 2598 data, 2599 ifp, td)); 2600 if (error == EOPNOTSUPP && ifp != NULL && 2601 ifp->if_ioctl != NULL) 2602 error = (*ifp->if_ioctl)(ifp, cmd, data); 2603 switch (ocmd) { 2604 2605 case OSIOCGIFADDR: 2606 case OSIOCGIFDSTADDR: 2607 case OSIOCGIFBRDADDR: 2608 case OSIOCGIFNETMASK: 2609 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2610 2611 } 2612 } 2613 #endif /* COMPAT_43 */ 2614 2615 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2616 #ifdef INET6 2617 if (ifp->if_flags & IFF_UP) 2618 in6_if_up(ifp); 2619 #endif 2620 } 2621 if_rele(ifp); 2622 CURVNET_RESTORE(); 2623 return (error); 2624 } 2625 2626 /* 2627 * The code common to handling reference counted flags, 2628 * e.g., in ifpromisc() and if_allmulti(). 2629 * The "pflag" argument can specify a permanent mode flag to check, 2630 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2631 * 2632 * Only to be used on stack-owned flags, not driver-owned flags. 2633 */ 2634 static int 2635 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2636 { 2637 struct ifreq ifr; 2638 int error; 2639 int oldflags, oldcount; 2640 2641 /* Sanity checks to catch programming errors */ 2642 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2643 ("%s: setting driver-owned flag %d", __func__, flag)); 2644 2645 if (onswitch) 2646 KASSERT(*refcount >= 0, 2647 ("%s: increment negative refcount %d for flag %d", 2648 __func__, *refcount, flag)); 2649 else 2650 KASSERT(*refcount > 0, 2651 ("%s: decrement non-positive refcount %d for flag %d", 2652 __func__, *refcount, flag)); 2653 2654 /* In case this mode is permanent, just touch refcount */ 2655 if (ifp->if_flags & pflag) { 2656 *refcount += onswitch ? 1 : -1; 2657 return (0); 2658 } 2659 2660 /* Save ifnet parameters for if_ioctl() may fail */ 2661 oldcount = *refcount; 2662 oldflags = ifp->if_flags; 2663 2664 /* 2665 * See if we aren't the only and touching refcount is enough. 2666 * Actually toggle interface flag if we are the first or last. 2667 */ 2668 if (onswitch) { 2669 if ((*refcount)++) 2670 return (0); 2671 ifp->if_flags |= flag; 2672 } else { 2673 if (--(*refcount)) 2674 return (0); 2675 ifp->if_flags &= ~flag; 2676 } 2677 2678 /* Call down the driver since we've changed interface flags */ 2679 if (ifp->if_ioctl == NULL) { 2680 error = EOPNOTSUPP; 2681 goto recover; 2682 } 2683 ifr.ifr_flags = ifp->if_flags & 0xffff; 2684 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2685 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2686 if (error) 2687 goto recover; 2688 /* Notify userland that interface flags have changed */ 2689 rt_ifmsg(ifp); 2690 return (0); 2691 2692 recover: 2693 /* Recover after driver error */ 2694 *refcount = oldcount; 2695 ifp->if_flags = oldflags; 2696 return (error); 2697 } 2698 2699 /* 2700 * Set/clear promiscuous mode on interface ifp based on the truth value 2701 * of pswitch. The calls are reference counted so that only the first 2702 * "on" request actually has an effect, as does the final "off" request. 2703 * Results are undefined if the "off" and "on" requests are not matched. 2704 */ 2705 int 2706 ifpromisc(struct ifnet *ifp, int pswitch) 2707 { 2708 int error; 2709 int oldflags = ifp->if_flags; 2710 2711 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2712 &ifp->if_pcount, pswitch); 2713 /* If promiscuous mode status has changed, log a message */ 2714 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2715 log(LOG_INFO, "%s: promiscuous mode %s\n", 2716 ifp->if_xname, 2717 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2718 return (error); 2719 } 2720 2721 /* 2722 * Return interface configuration 2723 * of system. List may be used 2724 * in later ioctl's (above) to get 2725 * other information. 2726 */ 2727 /*ARGSUSED*/ 2728 static int 2729 ifconf(u_long cmd, caddr_t data) 2730 { 2731 struct ifconf *ifc = (struct ifconf *)data; 2732 struct ifnet *ifp; 2733 struct ifaddr *ifa; 2734 struct ifreq ifr; 2735 struct sbuf *sb; 2736 int error, full = 0, valid_len, max_len; 2737 2738 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2739 max_len = MAXPHYS - 1; 2740 2741 /* Prevent hostile input from being able to crash the system */ 2742 if (ifc->ifc_len <= 0) 2743 return (EINVAL); 2744 2745 again: 2746 if (ifc->ifc_len <= max_len) { 2747 max_len = ifc->ifc_len; 2748 full = 1; 2749 } 2750 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2751 max_len = 0; 2752 valid_len = 0; 2753 2754 IFNET_RLOCK(); 2755 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2756 int addrs; 2757 2758 /* 2759 * Zero the ifr_name buffer to make sure we don't 2760 * disclose the contents of the stack. 2761 */ 2762 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2763 2764 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2765 >= sizeof(ifr.ifr_name)) { 2766 sbuf_delete(sb); 2767 IFNET_RUNLOCK(); 2768 return (ENAMETOOLONG); 2769 } 2770 2771 addrs = 0; 2772 IF_ADDR_RLOCK(ifp); 2773 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2774 struct sockaddr *sa = ifa->ifa_addr; 2775 2776 if (prison_if(curthread->td_ucred, sa) != 0) 2777 continue; 2778 addrs++; 2779 #ifdef COMPAT_43 2780 if (cmd == OSIOCGIFCONF) { 2781 struct osockaddr *osa = 2782 (struct osockaddr *)&ifr.ifr_addr; 2783 ifr.ifr_addr = *sa; 2784 osa->sa_family = sa->sa_family; 2785 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2786 max_len += sizeof(ifr); 2787 } else 2788 #endif 2789 if (sa->sa_len <= sizeof(*sa)) { 2790 ifr.ifr_addr = *sa; 2791 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2792 max_len += sizeof(ifr); 2793 } else { 2794 sbuf_bcat(sb, &ifr, 2795 offsetof(struct ifreq, ifr_addr)); 2796 max_len += offsetof(struct ifreq, ifr_addr); 2797 sbuf_bcat(sb, sa, sa->sa_len); 2798 max_len += sa->sa_len; 2799 } 2800 2801 if (sbuf_error(sb) == 0) 2802 valid_len = sbuf_len(sb); 2803 } 2804 IF_ADDR_RUNLOCK(ifp); 2805 if (addrs == 0) { 2806 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2807 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2808 max_len += sizeof(ifr); 2809 2810 if (sbuf_error(sb) == 0) 2811 valid_len = sbuf_len(sb); 2812 } 2813 } 2814 IFNET_RUNLOCK(); 2815 2816 /* 2817 * If we didn't allocate enough space (uncommon), try again. If 2818 * we have already allocated as much space as we are allowed, 2819 * return what we've got. 2820 */ 2821 if (valid_len != max_len && !full) { 2822 sbuf_delete(sb); 2823 goto again; 2824 } 2825 2826 ifc->ifc_len = valid_len; 2827 sbuf_finish(sb); 2828 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2829 sbuf_delete(sb); 2830 return (error); 2831 } 2832 2833 /* 2834 * Just like ifpromisc(), but for all-multicast-reception mode. 2835 */ 2836 int 2837 if_allmulti(struct ifnet *ifp, int onswitch) 2838 { 2839 2840 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2841 } 2842 2843 struct ifmultiaddr * 2844 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2845 { 2846 struct ifmultiaddr *ifma; 2847 2848 IF_ADDR_LOCK_ASSERT(ifp); 2849 2850 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2851 if (sa->sa_family == AF_LINK) { 2852 if (sa_dl_equal(ifma->ifma_addr, sa)) 2853 break; 2854 } else { 2855 if (sa_equal(ifma->ifma_addr, sa)) 2856 break; 2857 } 2858 } 2859 2860 return ifma; 2861 } 2862 2863 /* 2864 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2865 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2866 * the ifnet multicast address list here, so the caller must do that and 2867 * other setup work (such as notifying the device driver). The reference 2868 * count is initialized to 1. 2869 */ 2870 static struct ifmultiaddr * 2871 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2872 int mflags) 2873 { 2874 struct ifmultiaddr *ifma; 2875 struct sockaddr *dupsa; 2876 2877 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2878 M_ZERO); 2879 if (ifma == NULL) 2880 return (NULL); 2881 2882 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2883 if (dupsa == NULL) { 2884 free(ifma, M_IFMADDR); 2885 return (NULL); 2886 } 2887 bcopy(sa, dupsa, sa->sa_len); 2888 ifma->ifma_addr = dupsa; 2889 2890 ifma->ifma_ifp = ifp; 2891 ifma->ifma_refcount = 1; 2892 ifma->ifma_protospec = NULL; 2893 2894 if (llsa == NULL) { 2895 ifma->ifma_lladdr = NULL; 2896 return (ifma); 2897 } 2898 2899 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2900 if (dupsa == NULL) { 2901 free(ifma->ifma_addr, M_IFMADDR); 2902 free(ifma, M_IFMADDR); 2903 return (NULL); 2904 } 2905 bcopy(llsa, dupsa, llsa->sa_len); 2906 ifma->ifma_lladdr = dupsa; 2907 2908 return (ifma); 2909 } 2910 2911 /* 2912 * if_freemulti: free ifmultiaddr structure and possibly attached related 2913 * addresses. The caller is responsible for implementing reference 2914 * counting, notifying the driver, handling routing messages, and releasing 2915 * any dependent link layer state. 2916 */ 2917 static void 2918 if_freemulti(struct ifmultiaddr *ifma) 2919 { 2920 2921 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2922 ifma->ifma_refcount)); 2923 KASSERT(ifma->ifma_protospec == NULL, 2924 ("if_freemulti: protospec not NULL")); 2925 2926 if (ifma->ifma_lladdr != NULL) 2927 free(ifma->ifma_lladdr, M_IFMADDR); 2928 free(ifma->ifma_addr, M_IFMADDR); 2929 free(ifma, M_IFMADDR); 2930 } 2931 2932 /* 2933 * Register an additional multicast address with a network interface. 2934 * 2935 * - If the address is already present, bump the reference count on the 2936 * address and return. 2937 * - If the address is not link-layer, look up a link layer address. 2938 * - Allocate address structures for one or both addresses, and attach to the 2939 * multicast address list on the interface. If automatically adding a link 2940 * layer address, the protocol address will own a reference to the link 2941 * layer address, to be freed when it is freed. 2942 * - Notify the network device driver of an addition to the multicast address 2943 * list. 2944 * 2945 * 'sa' points to caller-owned memory with the desired multicast address. 2946 * 2947 * 'retifma' will be used to return a pointer to the resulting multicast 2948 * address reference, if desired. 2949 */ 2950 int 2951 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2952 struct ifmultiaddr **retifma) 2953 { 2954 struct ifmultiaddr *ifma, *ll_ifma; 2955 struct sockaddr *llsa; 2956 int error; 2957 2958 /* 2959 * If the address is already present, return a new reference to it; 2960 * otherwise, allocate storage and set up a new address. 2961 */ 2962 IF_ADDR_WLOCK(ifp); 2963 ifma = if_findmulti(ifp, sa); 2964 if (ifma != NULL) { 2965 ifma->ifma_refcount++; 2966 if (retifma != NULL) 2967 *retifma = ifma; 2968 IF_ADDR_WUNLOCK(ifp); 2969 return (0); 2970 } 2971 2972 /* 2973 * The address isn't already present; resolve the protocol address 2974 * into a link layer address, and then look that up, bump its 2975 * refcount or allocate an ifma for that also. If 'llsa' was 2976 * returned, we will need to free it later. 2977 */ 2978 llsa = NULL; 2979 ll_ifma = NULL; 2980 if (ifp->if_resolvemulti != NULL) { 2981 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2982 if (error) 2983 goto unlock_out; 2984 } 2985 2986 /* 2987 * Allocate the new address. Don't hook it up yet, as we may also 2988 * need to allocate a link layer multicast address. 2989 */ 2990 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2991 if (ifma == NULL) { 2992 error = ENOMEM; 2993 goto free_llsa_out; 2994 } 2995 2996 /* 2997 * If a link layer address is found, we'll need to see if it's 2998 * already present in the address list, or allocate is as well. 2999 * When this block finishes, the link layer address will be on the 3000 * list. 3001 */ 3002 if (llsa != NULL) { 3003 ll_ifma = if_findmulti(ifp, llsa); 3004 if (ll_ifma == NULL) { 3005 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3006 if (ll_ifma == NULL) { 3007 --ifma->ifma_refcount; 3008 if_freemulti(ifma); 3009 error = ENOMEM; 3010 goto free_llsa_out; 3011 } 3012 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3013 ifma_link); 3014 } else 3015 ll_ifma->ifma_refcount++; 3016 ifma->ifma_llifma = ll_ifma; 3017 } 3018 3019 /* 3020 * We now have a new multicast address, ifma, and possibly a new or 3021 * referenced link layer address. Add the primary address to the 3022 * ifnet address list. 3023 */ 3024 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3025 3026 if (retifma != NULL) 3027 *retifma = ifma; 3028 3029 /* 3030 * Must generate the message while holding the lock so that 'ifma' 3031 * pointer is still valid. 3032 */ 3033 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3034 IF_ADDR_WUNLOCK(ifp); 3035 3036 /* 3037 * We are certain we have added something, so call down to the 3038 * interface to let them know about it. 3039 */ 3040 if (ifp->if_ioctl != NULL) { 3041 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3042 } 3043 3044 if (llsa != NULL) 3045 free(llsa, M_IFMADDR); 3046 3047 return (0); 3048 3049 free_llsa_out: 3050 if (llsa != NULL) 3051 free(llsa, M_IFMADDR); 3052 3053 unlock_out: 3054 IF_ADDR_WUNLOCK(ifp); 3055 return (error); 3056 } 3057 3058 /* 3059 * Delete a multicast group membership by network-layer group address. 3060 * 3061 * Returns ENOENT if the entry could not be found. If ifp no longer 3062 * exists, results are undefined. This entry point should only be used 3063 * from subsystems which do appropriate locking to hold ifp for the 3064 * duration of the call. 3065 * Network-layer protocol domains must use if_delmulti_ifma(). 3066 */ 3067 int 3068 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3069 { 3070 struct ifmultiaddr *ifma; 3071 int lastref; 3072 #ifdef INVARIANTS 3073 struct ifnet *oifp; 3074 3075 IFNET_RLOCK_NOSLEEP(); 3076 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3077 if (ifp == oifp) 3078 break; 3079 if (ifp != oifp) 3080 ifp = NULL; 3081 IFNET_RUNLOCK_NOSLEEP(); 3082 3083 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3084 #endif 3085 if (ifp == NULL) 3086 return (ENOENT); 3087 3088 IF_ADDR_WLOCK(ifp); 3089 lastref = 0; 3090 ifma = if_findmulti(ifp, sa); 3091 if (ifma != NULL) 3092 lastref = if_delmulti_locked(ifp, ifma, 0); 3093 IF_ADDR_WUNLOCK(ifp); 3094 3095 if (ifma == NULL) 3096 return (ENOENT); 3097 3098 if (lastref && ifp->if_ioctl != NULL) { 3099 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3100 } 3101 3102 return (0); 3103 } 3104 3105 /* 3106 * Delete all multicast group membership for an interface. 3107 * Should be used to quickly flush all multicast filters. 3108 */ 3109 void 3110 if_delallmulti(struct ifnet *ifp) 3111 { 3112 struct ifmultiaddr *ifma; 3113 struct ifmultiaddr *next; 3114 3115 IF_ADDR_WLOCK(ifp); 3116 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3117 if_delmulti_locked(ifp, ifma, 0); 3118 IF_ADDR_WUNLOCK(ifp); 3119 } 3120 3121 /* 3122 * Delete a multicast group membership by group membership pointer. 3123 * Network-layer protocol domains must use this routine. 3124 * 3125 * It is safe to call this routine if the ifp disappeared. 3126 */ 3127 void 3128 if_delmulti_ifma(struct ifmultiaddr *ifma) 3129 { 3130 struct ifnet *ifp; 3131 int lastref; 3132 3133 ifp = ifma->ifma_ifp; 3134 #ifdef DIAGNOSTIC 3135 if (ifp == NULL) { 3136 printf("%s: ifma_ifp seems to be detached\n", __func__); 3137 } else { 3138 struct ifnet *oifp; 3139 3140 IFNET_RLOCK_NOSLEEP(); 3141 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3142 if (ifp == oifp) 3143 break; 3144 if (ifp != oifp) { 3145 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3146 ifp = NULL; 3147 } 3148 IFNET_RUNLOCK_NOSLEEP(); 3149 } 3150 #endif 3151 /* 3152 * If and only if the ifnet instance exists: Acquire the address lock. 3153 */ 3154 if (ifp != NULL) 3155 IF_ADDR_WLOCK(ifp); 3156 3157 lastref = if_delmulti_locked(ifp, ifma, 0); 3158 3159 if (ifp != NULL) { 3160 /* 3161 * If and only if the ifnet instance exists: 3162 * Release the address lock. 3163 * If the group was left: update the hardware hash filter. 3164 */ 3165 IF_ADDR_WUNLOCK(ifp); 3166 if (lastref && ifp->if_ioctl != NULL) { 3167 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3168 } 3169 } 3170 } 3171 3172 /* 3173 * Perform deletion of network-layer and/or link-layer multicast address. 3174 * 3175 * Return 0 if the reference count was decremented. 3176 * Return 1 if the final reference was released, indicating that the 3177 * hardware hash filter should be reprogrammed. 3178 */ 3179 static int 3180 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3181 { 3182 struct ifmultiaddr *ll_ifma; 3183 3184 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3185 KASSERT(ifma->ifma_ifp == ifp, 3186 ("%s: inconsistent ifp %p", __func__, ifp)); 3187 IF_ADDR_WLOCK_ASSERT(ifp); 3188 } 3189 3190 ifp = ifma->ifma_ifp; 3191 3192 /* 3193 * If the ifnet is detaching, null out references to ifnet, 3194 * so that upper protocol layers will notice, and not attempt 3195 * to obtain locks for an ifnet which no longer exists. The 3196 * routing socket announcement must happen before the ifnet 3197 * instance is detached from the system. 3198 */ 3199 if (detaching) { 3200 #ifdef DIAGNOSTIC 3201 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3202 #endif 3203 /* 3204 * ifp may already be nulled out if we are being reentered 3205 * to delete the ll_ifma. 3206 */ 3207 if (ifp != NULL) { 3208 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3209 ifma->ifma_ifp = NULL; 3210 } 3211 } 3212 3213 if (--ifma->ifma_refcount > 0) 3214 return 0; 3215 3216 /* 3217 * If this ifma is a network-layer ifma, a link-layer ifma may 3218 * have been associated with it. Release it first if so. 3219 */ 3220 ll_ifma = ifma->ifma_llifma; 3221 if (ll_ifma != NULL) { 3222 KASSERT(ifma->ifma_lladdr != NULL, 3223 ("%s: llifma w/o lladdr", __func__)); 3224 if (detaching) 3225 ll_ifma->ifma_ifp = NULL; /* XXX */ 3226 if (--ll_ifma->ifma_refcount == 0) { 3227 if (ifp != NULL) { 3228 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3229 ifma_link); 3230 } 3231 if_freemulti(ll_ifma); 3232 } 3233 } 3234 3235 if (ifp != NULL) 3236 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3237 3238 if_freemulti(ifma); 3239 3240 /* 3241 * The last reference to this instance of struct ifmultiaddr 3242 * was released; the hardware should be notified of this change. 3243 */ 3244 return 1; 3245 } 3246 3247 /* 3248 * Set the link layer address on an interface. 3249 * 3250 * At this time we only support certain types of interfaces, 3251 * and we don't allow the length of the address to change. 3252 */ 3253 int 3254 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3255 { 3256 struct sockaddr_dl *sdl; 3257 struct ifaddr *ifa; 3258 struct ifreq ifr; 3259 3260 IF_ADDR_RLOCK(ifp); 3261 ifa = ifp->if_addr; 3262 if (ifa == NULL) { 3263 IF_ADDR_RUNLOCK(ifp); 3264 return (EINVAL); 3265 } 3266 ifa_ref(ifa); 3267 IF_ADDR_RUNLOCK(ifp); 3268 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3269 if (sdl == NULL) { 3270 ifa_free(ifa); 3271 return (EINVAL); 3272 } 3273 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3274 ifa_free(ifa); 3275 return (EINVAL); 3276 } 3277 switch (ifp->if_type) { 3278 case IFT_ETHER: 3279 case IFT_FDDI: 3280 case IFT_XETHER: 3281 case IFT_ISO88025: 3282 case IFT_L2VLAN: 3283 case IFT_BRIDGE: 3284 case IFT_ARCNET: 3285 case IFT_IEEE8023ADLAG: 3286 case IFT_IEEE80211: 3287 bcopy(lladdr, LLADDR(sdl), len); 3288 ifa_free(ifa); 3289 break; 3290 default: 3291 ifa_free(ifa); 3292 return (ENODEV); 3293 } 3294 3295 /* 3296 * If the interface is already up, we need 3297 * to re-init it in order to reprogram its 3298 * address filter. 3299 */ 3300 if ((ifp->if_flags & IFF_UP) != 0) { 3301 if (ifp->if_ioctl) { 3302 ifp->if_flags &= ~IFF_UP; 3303 ifr.ifr_flags = ifp->if_flags & 0xffff; 3304 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3305 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3306 ifp->if_flags |= IFF_UP; 3307 ifr.ifr_flags = ifp->if_flags & 0xffff; 3308 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3309 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3310 } 3311 #ifdef INET 3312 /* 3313 * Also send gratuitous ARPs to notify other nodes about 3314 * the address change. 3315 */ 3316 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3317 if (ifa->ifa_addr->sa_family == AF_INET) 3318 arp_ifinit(ifp, ifa); 3319 } 3320 #endif 3321 } 3322 return (0); 3323 } 3324 3325 /* 3326 * The name argument must be a pointer to storage which will last as 3327 * long as the interface does. For physical devices, the result of 3328 * device_get_name(dev) is a good choice and for pseudo-devices a 3329 * static string works well. 3330 */ 3331 void 3332 if_initname(struct ifnet *ifp, const char *name, int unit) 3333 { 3334 ifp->if_dname = name; 3335 ifp->if_dunit = unit; 3336 if (unit != IF_DUNIT_NONE) 3337 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3338 else 3339 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3340 } 3341 3342 int 3343 if_printf(struct ifnet *ifp, const char * fmt, ...) 3344 { 3345 va_list ap; 3346 int retval; 3347 3348 retval = printf("%s: ", ifp->if_xname); 3349 va_start(ap, fmt); 3350 retval += vprintf(fmt, ap); 3351 va_end(ap); 3352 return (retval); 3353 } 3354 3355 void 3356 if_start(struct ifnet *ifp) 3357 { 3358 3359 (*(ifp)->if_start)(ifp); 3360 } 3361 3362 /* 3363 * Backwards compatibility interface for drivers 3364 * that have not implemented it 3365 */ 3366 static int 3367 if_transmit(struct ifnet *ifp, struct mbuf *m) 3368 { 3369 int error; 3370 3371 IFQ_HANDOFF(ifp, m, error); 3372 return (error); 3373 } 3374 3375 int 3376 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3377 { 3378 int active = 0; 3379 3380 IF_LOCK(ifq); 3381 if (_IF_QFULL(ifq)) { 3382 _IF_DROP(ifq); 3383 IF_UNLOCK(ifq); 3384 m_freem(m); 3385 return (0); 3386 } 3387 if (ifp != NULL) { 3388 ifp->if_obytes += m->m_pkthdr.len + adjust; 3389 if (m->m_flags & (M_BCAST|M_MCAST)) 3390 ifp->if_omcasts++; 3391 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3392 } 3393 _IF_ENQUEUE(ifq, m); 3394 IF_UNLOCK(ifq); 3395 if (ifp != NULL && !active) 3396 (*(ifp)->if_start)(ifp); 3397 return (1); 3398 } 3399 3400 void 3401 if_register_com_alloc(u_char type, 3402 if_com_alloc_t *a, if_com_free_t *f) 3403 { 3404 3405 KASSERT(if_com_alloc[type] == NULL, 3406 ("if_register_com_alloc: %d already registered", type)); 3407 KASSERT(if_com_free[type] == NULL, 3408 ("if_register_com_alloc: %d free already registered", type)); 3409 3410 if_com_alloc[type] = a; 3411 if_com_free[type] = f; 3412 } 3413 3414 void 3415 if_deregister_com_alloc(u_char type) 3416 { 3417 3418 KASSERT(if_com_alloc[type] != NULL, 3419 ("if_deregister_com_alloc: %d not registered", type)); 3420 KASSERT(if_com_free[type] != NULL, 3421 ("if_deregister_com_alloc: %d free not registered", type)); 3422 if_com_alloc[type] = NULL; 3423 if_com_free[type] = NULL; 3424 } 3425