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 /* Initialize to max value. */ 658 if (ifp->if_hw_tsomax == 0) 659 ifp->if_hw_tsomax = IP_MAXPACKET; 660 KASSERT(ifp->if_hw_tsomax <= IP_MAXPACKET && 661 ifp->if_hw_tsomax >= IP_MAXPACKET / 8, 662 ("%s: tsomax outside of range", __func__)); 663 } 664 #ifdef VIMAGE 665 else { 666 /* 667 * Update the interface index in the link layer address 668 * of the interface. 669 */ 670 for (ifa = ifp->if_addr; ifa != NULL; 671 ifa = TAILQ_NEXT(ifa, ifa_link)) { 672 if (ifa->ifa_addr->sa_family == AF_LINK) { 673 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 674 sdl->sdl_index = ifp->if_index; 675 } 676 } 677 } 678 #endif 679 680 IFNET_WLOCK(); 681 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 682 #ifdef VIMAGE 683 curvnet->vnet_ifcnt++; 684 #endif 685 IFNET_WUNLOCK(); 686 687 if (domain_init_status >= 2) 688 if_attachdomain1(ifp); 689 690 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 691 if (IS_DEFAULT_VNET(curvnet)) 692 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 693 694 /* Announce the interface. */ 695 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 696 } 697 698 static void 699 if_attachdomain(void *dummy) 700 { 701 struct ifnet *ifp; 702 703 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 704 if_attachdomain1(ifp); 705 } 706 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 707 if_attachdomain, NULL); 708 709 static void 710 if_attachdomain1(struct ifnet *ifp) 711 { 712 struct domain *dp; 713 714 /* 715 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 716 * cannot lock ifp->if_afdata initialization, entirely. 717 */ 718 if (IF_AFDATA_TRYLOCK(ifp) == 0) 719 return; 720 if (ifp->if_afdata_initialized >= domain_init_status) { 721 IF_AFDATA_UNLOCK(ifp); 722 log(LOG_WARNING, "%s called more than once on %s\n", 723 __func__, ifp->if_xname); 724 return; 725 } 726 ifp->if_afdata_initialized = domain_init_status; 727 IF_AFDATA_UNLOCK(ifp); 728 729 /* address family dependent data region */ 730 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 731 for (dp = domains; dp; dp = dp->dom_next) { 732 if (dp->dom_ifattach) 733 ifp->if_afdata[dp->dom_family] = 734 (*dp->dom_ifattach)(ifp); 735 } 736 } 737 738 /* 739 * Remove any unicast or broadcast network addresses from an interface. 740 */ 741 void 742 if_purgeaddrs(struct ifnet *ifp) 743 { 744 struct ifaddr *ifa, *next; 745 746 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 747 if (ifa->ifa_addr->sa_family == AF_LINK) 748 continue; 749 #ifdef INET 750 /* XXX: Ugly!! ad hoc just for INET */ 751 if (ifa->ifa_addr->sa_family == AF_INET) { 752 struct ifaliasreq ifr; 753 754 bzero(&ifr, sizeof(ifr)); 755 ifr.ifra_addr = *ifa->ifa_addr; 756 if (ifa->ifa_dstaddr) 757 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 758 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 759 NULL) == 0) 760 continue; 761 } 762 #endif /* INET */ 763 #ifdef INET6 764 if (ifa->ifa_addr->sa_family == AF_INET6) { 765 in6_purgeaddr(ifa); 766 /* ifp_addrhead is already updated */ 767 continue; 768 } 769 #endif /* INET6 */ 770 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 771 ifa_free(ifa); 772 } 773 } 774 775 /* 776 * Remove any multicast network addresses from an interface when an ifnet 777 * is going away. 778 */ 779 static void 780 if_purgemaddrs(struct ifnet *ifp) 781 { 782 struct ifmultiaddr *ifma; 783 struct ifmultiaddr *next; 784 785 IF_ADDR_WLOCK(ifp); 786 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 787 if_delmulti_locked(ifp, ifma, 1); 788 IF_ADDR_WUNLOCK(ifp); 789 } 790 791 /* 792 * Detach an interface, removing it from the list of "active" interfaces. 793 * If vmove flag is set on entry to if_detach_internal(), perform only a 794 * limited subset of cleanup tasks, given that we are moving an ifnet from 795 * one vnet to another, where it must be fully operational. 796 * 797 * XXXRW: There are some significant questions about event ordering, and 798 * how to prevent things from starting to use the interface during detach. 799 */ 800 void 801 if_detach(struct ifnet *ifp) 802 { 803 804 if_detach_internal(ifp, 0); 805 } 806 807 static void 808 if_detach_internal(struct ifnet *ifp, int vmove) 809 { 810 struct ifaddr *ifa; 811 struct radix_node_head *rnh; 812 int i, j; 813 struct domain *dp; 814 struct ifnet *iter; 815 int found = 0; 816 817 IFNET_WLOCK(); 818 TAILQ_FOREACH(iter, &V_ifnet, if_link) 819 if (iter == ifp) { 820 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 821 found = 1; 822 break; 823 } 824 #ifdef VIMAGE 825 if (found) 826 curvnet->vnet_ifcnt--; 827 #endif 828 IFNET_WUNLOCK(); 829 if (!found) { 830 if (vmove) 831 panic("%s: ifp=%p not on the ifnet tailq %p", 832 __func__, ifp, &V_ifnet); 833 else 834 return; /* XXX this should panic as well? */ 835 } 836 837 /* 838 * Remove/wait for pending events. 839 */ 840 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 841 842 /* 843 * Remove routes and flush queues. 844 */ 845 if_down(ifp); 846 #ifdef ALTQ 847 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 848 altq_disable(&ifp->if_snd); 849 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 850 altq_detach(&ifp->if_snd); 851 #endif 852 853 if_purgeaddrs(ifp); 854 855 #ifdef INET 856 in_ifdetach(ifp); 857 #endif 858 859 #ifdef INET6 860 /* 861 * Remove all IPv6 kernel structs related to ifp. This should be done 862 * before removing routing entries below, since IPv6 interface direct 863 * routes are expected to be removed by the IPv6-specific kernel API. 864 * Otherwise, the kernel will detect some inconsistency and bark it. 865 */ 866 in6_ifdetach(ifp); 867 #endif 868 if_purgemaddrs(ifp); 869 870 if (!vmove) { 871 /* 872 * Prevent further calls into the device driver via ifnet. 873 */ 874 if_dead(ifp); 875 876 /* 877 * Remove link ifaddr pointer and maybe decrement if_index. 878 * Clean up all addresses. 879 */ 880 ifp->if_addr = NULL; 881 882 /* We can now free link ifaddr. */ 883 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 884 ifa = TAILQ_FIRST(&ifp->if_addrhead); 885 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 886 ifa_free(ifa); 887 } 888 } 889 890 /* 891 * Delete all remaining routes using this interface 892 * Unfortuneatly the only way to do this is to slog through 893 * the entire routing table looking for routes which point 894 * to this interface...oh well... 895 */ 896 for (i = 1; i <= AF_MAX; i++) { 897 for (j = 0; j < rt_numfibs; j++) { 898 rnh = rt_tables_get_rnh(j, i); 899 if (rnh == NULL) 900 continue; 901 RADIX_NODE_HEAD_LOCK(rnh); 902 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 903 RADIX_NODE_HEAD_UNLOCK(rnh); 904 } 905 } 906 907 /* Announce that the interface is gone. */ 908 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 909 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 910 if (IS_DEFAULT_VNET(curvnet)) 911 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 912 if_delgroups(ifp); 913 914 /* 915 * We cannot hold the lock over dom_ifdetach calls as they might 916 * sleep, for example trying to drain a callout, thus open up the 917 * theoretical race with re-attaching. 918 */ 919 IF_AFDATA_LOCK(ifp); 920 i = ifp->if_afdata_initialized; 921 ifp->if_afdata_initialized = 0; 922 IF_AFDATA_UNLOCK(ifp); 923 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 924 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 925 (*dp->dom_ifdetach)(ifp, 926 ifp->if_afdata[dp->dom_family]); 927 } 928 } 929 930 #ifdef VIMAGE 931 /* 932 * if_vmove() performs a limited version of if_detach() in current 933 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 934 * An attempt is made to shrink if_index in current vnet, find an 935 * unused if_index in target vnet and calls if_grow() if necessary, 936 * and finally find an unused if_xname for the target vnet. 937 */ 938 void 939 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 940 { 941 u_short idx; 942 943 /* 944 * Detach from current vnet, but preserve LLADDR info, do not 945 * mark as dead etc. so that the ifnet can be reattached later. 946 */ 947 if_detach_internal(ifp, 1); 948 949 /* 950 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 951 * the if_index for that vnet if possible. 952 * 953 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 954 * or we'd lock on one vnet and unlock on another. 955 */ 956 IFNET_WLOCK(); 957 ifindex_free_locked(ifp->if_index); 958 IFNET_WUNLOCK(); 959 960 /* 961 * Perform interface-specific reassignment tasks, if provided by 962 * the driver. 963 */ 964 if (ifp->if_reassign != NULL) 965 ifp->if_reassign(ifp, new_vnet, NULL); 966 967 /* 968 * Switch to the context of the target vnet. 969 */ 970 CURVNET_SET_QUIET(new_vnet); 971 972 IFNET_WLOCK(); 973 if (ifindex_alloc_locked(&idx) != 0) { 974 IFNET_WUNLOCK(); 975 panic("if_index overflow"); 976 } 977 ifp->if_index = idx; 978 ifnet_setbyindex_locked(ifp->if_index, ifp); 979 IFNET_WUNLOCK(); 980 981 if_attach_internal(ifp, 1); 982 983 CURVNET_RESTORE(); 984 } 985 986 /* 987 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 988 */ 989 static int 990 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 991 { 992 struct prison *pr; 993 struct ifnet *difp; 994 995 /* Try to find the prison within our visibility. */ 996 sx_slock(&allprison_lock); 997 pr = prison_find_child(td->td_ucred->cr_prison, jid); 998 sx_sunlock(&allprison_lock); 999 if (pr == NULL) 1000 return (ENXIO); 1001 prison_hold_locked(pr); 1002 mtx_unlock(&pr->pr_mtx); 1003 1004 /* Do not try to move the iface from and to the same prison. */ 1005 if (pr->pr_vnet == ifp->if_vnet) { 1006 prison_free(pr); 1007 return (EEXIST); 1008 } 1009 1010 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1011 /* XXX Lock interfaces to avoid races. */ 1012 CURVNET_SET_QUIET(pr->pr_vnet); 1013 difp = ifunit(ifname); 1014 CURVNET_RESTORE(); 1015 if (difp != NULL) { 1016 prison_free(pr); 1017 return (EEXIST); 1018 } 1019 1020 /* Move the interface into the child jail/vnet. */ 1021 if_vmove(ifp, pr->pr_vnet); 1022 1023 /* Report the new if_xname back to the userland. */ 1024 sprintf(ifname, "%s", ifp->if_xname); 1025 1026 prison_free(pr); 1027 return (0); 1028 } 1029 1030 static int 1031 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1032 { 1033 struct prison *pr; 1034 struct vnet *vnet_dst; 1035 struct ifnet *ifp; 1036 1037 /* Try to find the prison within our visibility. */ 1038 sx_slock(&allprison_lock); 1039 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1040 sx_sunlock(&allprison_lock); 1041 if (pr == NULL) 1042 return (ENXIO); 1043 prison_hold_locked(pr); 1044 mtx_unlock(&pr->pr_mtx); 1045 1046 /* Make sure the named iface exists in the source prison/vnet. */ 1047 CURVNET_SET(pr->pr_vnet); 1048 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1049 if (ifp == NULL) { 1050 CURVNET_RESTORE(); 1051 prison_free(pr); 1052 return (ENXIO); 1053 } 1054 1055 /* Do not try to move the iface from and to the same prison. */ 1056 vnet_dst = TD_TO_VNET(td); 1057 if (vnet_dst == ifp->if_vnet) { 1058 CURVNET_RESTORE(); 1059 prison_free(pr); 1060 return (EEXIST); 1061 } 1062 1063 /* Get interface back from child jail/vnet. */ 1064 if_vmove(ifp, vnet_dst); 1065 CURVNET_RESTORE(); 1066 1067 /* Report the new if_xname back to the userland. */ 1068 sprintf(ifname, "%s", ifp->if_xname); 1069 1070 prison_free(pr); 1071 return (0); 1072 } 1073 #endif /* VIMAGE */ 1074 1075 /* 1076 * Add a group to an interface 1077 */ 1078 int 1079 if_addgroup(struct ifnet *ifp, const char *groupname) 1080 { 1081 struct ifg_list *ifgl; 1082 struct ifg_group *ifg = NULL; 1083 struct ifg_member *ifgm; 1084 int new = 0; 1085 1086 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1087 groupname[strlen(groupname) - 1] <= '9') 1088 return (EINVAL); 1089 1090 IFNET_WLOCK(); 1091 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1092 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1093 IFNET_WUNLOCK(); 1094 return (EEXIST); 1095 } 1096 1097 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1098 M_NOWAIT)) == NULL) { 1099 IFNET_WUNLOCK(); 1100 return (ENOMEM); 1101 } 1102 1103 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1104 M_TEMP, M_NOWAIT)) == NULL) { 1105 free(ifgl, M_TEMP); 1106 IFNET_WUNLOCK(); 1107 return (ENOMEM); 1108 } 1109 1110 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1111 if (!strcmp(ifg->ifg_group, groupname)) 1112 break; 1113 1114 if (ifg == NULL) { 1115 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1116 M_TEMP, M_NOWAIT)) == NULL) { 1117 free(ifgl, M_TEMP); 1118 free(ifgm, M_TEMP); 1119 IFNET_WUNLOCK(); 1120 return (ENOMEM); 1121 } 1122 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1123 ifg->ifg_refcnt = 0; 1124 TAILQ_INIT(&ifg->ifg_members); 1125 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1126 new = 1; 1127 } 1128 1129 ifg->ifg_refcnt++; 1130 ifgl->ifgl_group = ifg; 1131 ifgm->ifgm_ifp = ifp; 1132 1133 IF_ADDR_WLOCK(ifp); 1134 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1135 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1136 IF_ADDR_WUNLOCK(ifp); 1137 1138 IFNET_WUNLOCK(); 1139 1140 if (new) 1141 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1142 EVENTHANDLER_INVOKE(group_change_event, groupname); 1143 1144 return (0); 1145 } 1146 1147 /* 1148 * Remove a group from an interface 1149 */ 1150 int 1151 if_delgroup(struct ifnet *ifp, const char *groupname) 1152 { 1153 struct ifg_list *ifgl; 1154 struct ifg_member *ifgm; 1155 1156 IFNET_WLOCK(); 1157 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1158 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1159 break; 1160 if (ifgl == NULL) { 1161 IFNET_WUNLOCK(); 1162 return (ENOENT); 1163 } 1164 1165 IF_ADDR_WLOCK(ifp); 1166 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1167 IF_ADDR_WUNLOCK(ifp); 1168 1169 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1170 if (ifgm->ifgm_ifp == ifp) 1171 break; 1172 1173 if (ifgm != NULL) { 1174 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1175 free(ifgm, M_TEMP); 1176 } 1177 1178 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1179 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1180 IFNET_WUNLOCK(); 1181 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1182 free(ifgl->ifgl_group, M_TEMP); 1183 } else 1184 IFNET_WUNLOCK(); 1185 1186 free(ifgl, M_TEMP); 1187 1188 EVENTHANDLER_INVOKE(group_change_event, groupname); 1189 1190 return (0); 1191 } 1192 1193 /* 1194 * Remove an interface from all groups 1195 */ 1196 static void 1197 if_delgroups(struct ifnet *ifp) 1198 { 1199 struct ifg_list *ifgl; 1200 struct ifg_member *ifgm; 1201 char groupname[IFNAMSIZ]; 1202 1203 IFNET_WLOCK(); 1204 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1205 ifgl = TAILQ_FIRST(&ifp->if_groups); 1206 1207 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1208 1209 IF_ADDR_WLOCK(ifp); 1210 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1211 IF_ADDR_WUNLOCK(ifp); 1212 1213 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1214 if (ifgm->ifgm_ifp == ifp) 1215 break; 1216 1217 if (ifgm != NULL) { 1218 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1219 ifgm_next); 1220 free(ifgm, M_TEMP); 1221 } 1222 1223 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1224 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1225 IFNET_WUNLOCK(); 1226 EVENTHANDLER_INVOKE(group_detach_event, 1227 ifgl->ifgl_group); 1228 free(ifgl->ifgl_group, M_TEMP); 1229 } else 1230 IFNET_WUNLOCK(); 1231 1232 free(ifgl, M_TEMP); 1233 1234 EVENTHANDLER_INVOKE(group_change_event, groupname); 1235 1236 IFNET_WLOCK(); 1237 } 1238 IFNET_WUNLOCK(); 1239 } 1240 1241 /* 1242 * Stores all groups from an interface in memory pointed 1243 * to by data 1244 */ 1245 static int 1246 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1247 { 1248 int len, error; 1249 struct ifg_list *ifgl; 1250 struct ifg_req ifgrq, *ifgp; 1251 struct ifgroupreq *ifgr = data; 1252 1253 if (ifgr->ifgr_len == 0) { 1254 IF_ADDR_RLOCK(ifp); 1255 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1256 ifgr->ifgr_len += sizeof(struct ifg_req); 1257 IF_ADDR_RUNLOCK(ifp); 1258 return (0); 1259 } 1260 1261 len = ifgr->ifgr_len; 1262 ifgp = ifgr->ifgr_groups; 1263 /* XXX: wire */ 1264 IF_ADDR_RLOCK(ifp); 1265 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1266 if (len < sizeof(ifgrq)) { 1267 IF_ADDR_RUNLOCK(ifp); 1268 return (EINVAL); 1269 } 1270 bzero(&ifgrq, sizeof ifgrq); 1271 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1272 sizeof(ifgrq.ifgrq_group)); 1273 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1274 IF_ADDR_RUNLOCK(ifp); 1275 return (error); 1276 } 1277 len -= sizeof(ifgrq); 1278 ifgp++; 1279 } 1280 IF_ADDR_RUNLOCK(ifp); 1281 1282 return (0); 1283 } 1284 1285 /* 1286 * Stores all members of a group in memory pointed to by data 1287 */ 1288 static int 1289 if_getgroupmembers(struct ifgroupreq *data) 1290 { 1291 struct ifgroupreq *ifgr = data; 1292 struct ifg_group *ifg; 1293 struct ifg_member *ifgm; 1294 struct ifg_req ifgrq, *ifgp; 1295 int len, error; 1296 1297 IFNET_RLOCK(); 1298 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1299 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1300 break; 1301 if (ifg == NULL) { 1302 IFNET_RUNLOCK(); 1303 return (ENOENT); 1304 } 1305 1306 if (ifgr->ifgr_len == 0) { 1307 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1308 ifgr->ifgr_len += sizeof(ifgrq); 1309 IFNET_RUNLOCK(); 1310 return (0); 1311 } 1312 1313 len = ifgr->ifgr_len; 1314 ifgp = ifgr->ifgr_groups; 1315 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1316 if (len < sizeof(ifgrq)) { 1317 IFNET_RUNLOCK(); 1318 return (EINVAL); 1319 } 1320 bzero(&ifgrq, sizeof ifgrq); 1321 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1322 sizeof(ifgrq.ifgrq_member)); 1323 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1324 IFNET_RUNLOCK(); 1325 return (error); 1326 } 1327 len -= sizeof(ifgrq); 1328 ifgp++; 1329 } 1330 IFNET_RUNLOCK(); 1331 1332 return (0); 1333 } 1334 1335 /* 1336 * Delete Routes for a Network Interface 1337 * 1338 * Called for each routing entry via the rnh->rnh_walktree() call above 1339 * to delete all route entries referencing a detaching network interface. 1340 * 1341 * Arguments: 1342 * rn pointer to node in the routing table 1343 * arg argument passed to rnh->rnh_walktree() - detaching interface 1344 * 1345 * Returns: 1346 * 0 successful 1347 * errno failed - reason indicated 1348 * 1349 */ 1350 static int 1351 if_rtdel(struct radix_node *rn, void *arg) 1352 { 1353 struct rtentry *rt = (struct rtentry *)rn; 1354 struct ifnet *ifp = arg; 1355 int err; 1356 1357 if (rt->rt_ifp == ifp) { 1358 1359 /* 1360 * Protect (sorta) against walktree recursion problems 1361 * with cloned routes 1362 */ 1363 if ((rt->rt_flags & RTF_UP) == 0) 1364 return (0); 1365 1366 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1367 rt_mask(rt), 1368 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1369 (struct rtentry **) NULL, rt->rt_fibnum); 1370 if (err) { 1371 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1372 } 1373 } 1374 1375 return (0); 1376 } 1377 1378 /* 1379 * Wrapper functions for struct ifnet address list locking macros. These are 1380 * used by kernel modules to avoid encoding programming interface or binary 1381 * interface assumptions that may be violated when kernel-internal locking 1382 * approaches change. 1383 */ 1384 void 1385 if_addr_rlock(struct ifnet *ifp) 1386 { 1387 1388 IF_ADDR_RLOCK(ifp); 1389 } 1390 1391 void 1392 if_addr_runlock(struct ifnet *ifp) 1393 { 1394 1395 IF_ADDR_RUNLOCK(ifp); 1396 } 1397 1398 void 1399 if_maddr_rlock(struct ifnet *ifp) 1400 { 1401 1402 IF_ADDR_RLOCK(ifp); 1403 } 1404 1405 void 1406 if_maddr_runlock(struct ifnet *ifp) 1407 { 1408 1409 IF_ADDR_RUNLOCK(ifp); 1410 } 1411 1412 /* 1413 * Initialization, destruction and refcounting functions for ifaddrs. 1414 */ 1415 void 1416 ifa_init(struct ifaddr *ifa) 1417 { 1418 1419 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1420 refcount_init(&ifa->ifa_refcnt, 1); 1421 ifa->if_data.ifi_datalen = sizeof(ifa->if_data); 1422 } 1423 1424 void 1425 ifa_ref(struct ifaddr *ifa) 1426 { 1427 1428 refcount_acquire(&ifa->ifa_refcnt); 1429 } 1430 1431 void 1432 ifa_free(struct ifaddr *ifa) 1433 { 1434 1435 if (refcount_release(&ifa->ifa_refcnt)) { 1436 mtx_destroy(&ifa->ifa_mtx); 1437 free(ifa, M_IFADDR); 1438 } 1439 } 1440 1441 int 1442 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1443 { 1444 int error = 0; 1445 struct rtentry *rt = NULL; 1446 struct rt_addrinfo info; 1447 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1448 1449 bzero(&info, sizeof(info)); 1450 info.rti_ifp = V_loif; 1451 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1452 info.rti_info[RTAX_DST] = ia; 1453 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1454 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1455 1456 if (error == 0 && rt != NULL) { 1457 RT_LOCK(rt); 1458 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1459 ifa->ifa_ifp->if_type; 1460 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1461 ifa->ifa_ifp->if_index; 1462 RT_REMREF(rt); 1463 RT_UNLOCK(rt); 1464 } else if (error != 0) 1465 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1466 1467 return (error); 1468 } 1469 1470 int 1471 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1472 { 1473 int error = 0; 1474 struct rt_addrinfo info; 1475 struct sockaddr_dl null_sdl; 1476 1477 bzero(&null_sdl, sizeof(null_sdl)); 1478 null_sdl.sdl_len = sizeof(null_sdl); 1479 null_sdl.sdl_family = AF_LINK; 1480 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1481 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1482 bzero(&info, sizeof(info)); 1483 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1484 info.rti_info[RTAX_DST] = ia; 1485 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1486 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1487 1488 if (error != 0) 1489 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1490 1491 return (error); 1492 } 1493 1494 /* 1495 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1496 * structs used to represent other address families, it is necessary 1497 * to perform a different comparison. 1498 */ 1499 1500 #define sa_equal(a1, a2) \ 1501 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1502 1503 #define sa_dl_equal(a1, a2) \ 1504 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1505 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1506 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1507 LLADDR((struct sockaddr_dl *)(a2)), \ 1508 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1509 1510 /* 1511 * Locate an interface based on a complete address. 1512 */ 1513 /*ARGSUSED*/ 1514 static struct ifaddr * 1515 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1516 { 1517 struct ifnet *ifp; 1518 struct ifaddr *ifa; 1519 1520 IFNET_RLOCK_NOSLEEP(); 1521 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1522 IF_ADDR_RLOCK(ifp); 1523 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1524 if (ifa->ifa_addr->sa_family != addr->sa_family) 1525 continue; 1526 if (sa_equal(addr, ifa->ifa_addr)) { 1527 if (getref) 1528 ifa_ref(ifa); 1529 IF_ADDR_RUNLOCK(ifp); 1530 goto done; 1531 } 1532 /* IP6 doesn't have broadcast */ 1533 if ((ifp->if_flags & IFF_BROADCAST) && 1534 ifa->ifa_broadaddr && 1535 ifa->ifa_broadaddr->sa_len != 0 && 1536 sa_equal(ifa->ifa_broadaddr, addr)) { 1537 if (getref) 1538 ifa_ref(ifa); 1539 IF_ADDR_RUNLOCK(ifp); 1540 goto done; 1541 } 1542 } 1543 IF_ADDR_RUNLOCK(ifp); 1544 } 1545 ifa = NULL; 1546 done: 1547 IFNET_RUNLOCK_NOSLEEP(); 1548 return (ifa); 1549 } 1550 1551 struct ifaddr * 1552 ifa_ifwithaddr(struct sockaddr *addr) 1553 { 1554 1555 return (ifa_ifwithaddr_internal(addr, 1)); 1556 } 1557 1558 int 1559 ifa_ifwithaddr_check(struct sockaddr *addr) 1560 { 1561 1562 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1563 } 1564 1565 /* 1566 * Locate an interface based on the broadcast address. 1567 */ 1568 /* ARGSUSED */ 1569 struct ifaddr * 1570 ifa_ifwithbroadaddr(struct sockaddr *addr) 1571 { 1572 struct ifnet *ifp; 1573 struct ifaddr *ifa; 1574 1575 IFNET_RLOCK_NOSLEEP(); 1576 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1577 IF_ADDR_RLOCK(ifp); 1578 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1579 if (ifa->ifa_addr->sa_family != addr->sa_family) 1580 continue; 1581 if ((ifp->if_flags & IFF_BROADCAST) && 1582 ifa->ifa_broadaddr && 1583 ifa->ifa_broadaddr->sa_len != 0 && 1584 sa_equal(ifa->ifa_broadaddr, addr)) { 1585 ifa_ref(ifa); 1586 IF_ADDR_RUNLOCK(ifp); 1587 goto done; 1588 } 1589 } 1590 IF_ADDR_RUNLOCK(ifp); 1591 } 1592 ifa = NULL; 1593 done: 1594 IFNET_RUNLOCK_NOSLEEP(); 1595 return (ifa); 1596 } 1597 1598 /* 1599 * Locate the point to point interface with a given destination address. 1600 */ 1601 /*ARGSUSED*/ 1602 struct ifaddr * 1603 ifa_ifwithdstaddr(struct sockaddr *addr) 1604 { 1605 struct ifnet *ifp; 1606 struct ifaddr *ifa; 1607 1608 IFNET_RLOCK_NOSLEEP(); 1609 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1610 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1611 continue; 1612 IF_ADDR_RLOCK(ifp); 1613 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1614 if (ifa->ifa_addr->sa_family != addr->sa_family) 1615 continue; 1616 if (ifa->ifa_dstaddr != NULL && 1617 sa_equal(addr, ifa->ifa_dstaddr)) { 1618 ifa_ref(ifa); 1619 IF_ADDR_RUNLOCK(ifp); 1620 goto done; 1621 } 1622 } 1623 IF_ADDR_RUNLOCK(ifp); 1624 } 1625 ifa = NULL; 1626 done: 1627 IFNET_RUNLOCK_NOSLEEP(); 1628 return (ifa); 1629 } 1630 1631 /* 1632 * Find an interface on a specific network. If many, choice 1633 * is most specific found. 1634 */ 1635 struct ifaddr * 1636 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1637 { 1638 struct ifnet *ifp; 1639 struct ifaddr *ifa; 1640 struct ifaddr *ifa_maybe = NULL; 1641 u_int af = addr->sa_family; 1642 char *addr_data = addr->sa_data, *cplim; 1643 1644 /* 1645 * AF_LINK addresses can be looked up directly by their index number, 1646 * so do that if we can. 1647 */ 1648 if (af == AF_LINK) { 1649 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1650 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1651 return (ifaddr_byindex(sdl->sdl_index)); 1652 } 1653 1654 /* 1655 * Scan though each interface, looking for ones that have addresses 1656 * in this address family. Maintain a reference on ifa_maybe once 1657 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1658 * when we move onto the next interface. 1659 */ 1660 IFNET_RLOCK_NOSLEEP(); 1661 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1662 IF_ADDR_RLOCK(ifp); 1663 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1664 char *cp, *cp2, *cp3; 1665 1666 if (ifa->ifa_addr->sa_family != af) 1667 next: continue; 1668 if (af == AF_INET && 1669 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1670 /* 1671 * This is a bit broken as it doesn't 1672 * take into account that the remote end may 1673 * be a single node in the network we are 1674 * looking for. 1675 * The trouble is that we don't know the 1676 * netmask for the remote end. 1677 */ 1678 if (ifa->ifa_dstaddr != NULL && 1679 sa_equal(addr, ifa->ifa_dstaddr)) { 1680 ifa_ref(ifa); 1681 IF_ADDR_RUNLOCK(ifp); 1682 goto done; 1683 } 1684 } else { 1685 /* 1686 * if we have a special address handler, 1687 * then use it instead of the generic one. 1688 */ 1689 if (ifa->ifa_claim_addr) { 1690 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1691 ifa_ref(ifa); 1692 IF_ADDR_RUNLOCK(ifp); 1693 goto done; 1694 } 1695 continue; 1696 } 1697 1698 /* 1699 * Scan all the bits in the ifa's address. 1700 * If a bit dissagrees with what we are 1701 * looking for, mask it with the netmask 1702 * to see if it really matters. 1703 * (A byte at a time) 1704 */ 1705 if (ifa->ifa_netmask == 0) 1706 continue; 1707 cp = addr_data; 1708 cp2 = ifa->ifa_addr->sa_data; 1709 cp3 = ifa->ifa_netmask->sa_data; 1710 cplim = ifa->ifa_netmask->sa_len 1711 + (char *)ifa->ifa_netmask; 1712 while (cp3 < cplim) 1713 if ((*cp++ ^ *cp2++) & *cp3++) 1714 goto next; /* next address! */ 1715 /* 1716 * If the netmask of what we just found 1717 * is more specific than what we had before 1718 * (if we had one), or if the virtual status 1719 * of new prefix is better than of the old one, 1720 * then remember the new one before continuing 1721 * to search for an even better one. 1722 */ 1723 if (ifa_maybe == NULL || 1724 ifa_preferred(ifa_maybe, ifa) || 1725 rn_refines((caddr_t)ifa->ifa_netmask, 1726 (caddr_t)ifa_maybe->ifa_netmask)) { 1727 if (ifa_maybe != NULL) 1728 ifa_free(ifa_maybe); 1729 ifa_maybe = ifa; 1730 ifa_ref(ifa_maybe); 1731 } 1732 } 1733 } 1734 IF_ADDR_RUNLOCK(ifp); 1735 } 1736 ifa = ifa_maybe; 1737 ifa_maybe = NULL; 1738 done: 1739 IFNET_RUNLOCK_NOSLEEP(); 1740 if (ifa_maybe != NULL) 1741 ifa_free(ifa_maybe); 1742 return (ifa); 1743 } 1744 1745 /* 1746 * Find an interface address specific to an interface best matching 1747 * a given address. 1748 */ 1749 struct ifaddr * 1750 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1751 { 1752 struct ifaddr *ifa; 1753 char *cp, *cp2, *cp3; 1754 char *cplim; 1755 struct ifaddr *ifa_maybe = NULL; 1756 u_int af = addr->sa_family; 1757 1758 if (af >= AF_MAX) 1759 return (NULL); 1760 IF_ADDR_RLOCK(ifp); 1761 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1762 if (ifa->ifa_addr->sa_family != af) 1763 continue; 1764 if (ifa_maybe == NULL) 1765 ifa_maybe = ifa; 1766 if (ifa->ifa_netmask == 0) { 1767 if (sa_equal(addr, ifa->ifa_addr) || 1768 (ifa->ifa_dstaddr && 1769 sa_equal(addr, ifa->ifa_dstaddr))) 1770 goto done; 1771 continue; 1772 } 1773 if (ifp->if_flags & IFF_POINTOPOINT) { 1774 if (sa_equal(addr, ifa->ifa_dstaddr)) 1775 goto done; 1776 } else { 1777 cp = addr->sa_data; 1778 cp2 = ifa->ifa_addr->sa_data; 1779 cp3 = ifa->ifa_netmask->sa_data; 1780 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1781 for (; cp3 < cplim; cp3++) 1782 if ((*cp++ ^ *cp2++) & *cp3) 1783 break; 1784 if (cp3 == cplim) 1785 goto done; 1786 } 1787 } 1788 ifa = ifa_maybe; 1789 done: 1790 if (ifa != NULL) 1791 ifa_ref(ifa); 1792 IF_ADDR_RUNLOCK(ifp); 1793 return (ifa); 1794 } 1795 1796 /* 1797 * See whether new ifa is better than current one: 1798 * 1) A non-virtual one is preferred over virtual. 1799 * 2) A virtual in master state preferred over any other state. 1800 * 1801 * Used in several address selecting functions. 1802 */ 1803 int 1804 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 1805 { 1806 1807 return (cur->ifa_carp && (!next->ifa_carp || 1808 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 1809 } 1810 1811 #include <net/if_llatbl.h> 1812 1813 /* 1814 * Default action when installing a route with a Link Level gateway. 1815 * Lookup an appropriate real ifa to point to. 1816 * This should be moved to /sys/net/link.c eventually. 1817 */ 1818 static void 1819 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1820 { 1821 struct ifaddr *ifa, *oifa; 1822 struct sockaddr *dst; 1823 struct ifnet *ifp; 1824 1825 RT_LOCK_ASSERT(rt); 1826 1827 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1828 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1829 return; 1830 ifa = ifaof_ifpforaddr(dst, ifp); 1831 if (ifa) { 1832 oifa = rt->rt_ifa; 1833 rt->rt_ifa = ifa; 1834 ifa_free(oifa); 1835 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1836 ifa->ifa_rtrequest(cmd, rt, info); 1837 } 1838 } 1839 1840 /* 1841 * Mark an interface down and notify protocols of 1842 * the transition. 1843 */ 1844 static void 1845 if_unroute(struct ifnet *ifp, int flag, int fam) 1846 { 1847 struct ifaddr *ifa; 1848 1849 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1850 1851 ifp->if_flags &= ~flag; 1852 getmicrotime(&ifp->if_lastchange); 1853 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1854 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1855 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1856 ifp->if_qflush(ifp); 1857 1858 if (ifp->if_carp) 1859 (*carp_linkstate_p)(ifp); 1860 rt_ifmsg(ifp); 1861 } 1862 1863 /* 1864 * Mark an interface up and notify protocols of 1865 * the transition. 1866 */ 1867 static void 1868 if_route(struct ifnet *ifp, int flag, int fam) 1869 { 1870 struct ifaddr *ifa; 1871 1872 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1873 1874 ifp->if_flags |= flag; 1875 getmicrotime(&ifp->if_lastchange); 1876 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1877 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1878 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1879 if (ifp->if_carp) 1880 (*carp_linkstate_p)(ifp); 1881 rt_ifmsg(ifp); 1882 #ifdef INET6 1883 in6_if_up(ifp); 1884 #endif 1885 } 1886 1887 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1888 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1889 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1890 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1891 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1892 int (*vlan_setcookie_p)(struct ifnet *, void *); 1893 void *(*vlan_cookie_p)(struct ifnet *); 1894 1895 /* 1896 * Handle a change in the interface link state. To avoid LORs 1897 * between driver lock and upper layer locks, as well as possible 1898 * recursions, we post event to taskqueue, and all job 1899 * is done in static do_link_state_change(). 1900 */ 1901 void 1902 if_link_state_change(struct ifnet *ifp, int link_state) 1903 { 1904 /* Return if state hasn't changed. */ 1905 if (ifp->if_link_state == link_state) 1906 return; 1907 1908 ifp->if_link_state = link_state; 1909 1910 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1911 } 1912 1913 static void 1914 do_link_state_change(void *arg, int pending) 1915 { 1916 struct ifnet *ifp = (struct ifnet *)arg; 1917 int link_state = ifp->if_link_state; 1918 CURVNET_SET(ifp->if_vnet); 1919 1920 /* Notify that the link state has changed. */ 1921 rt_ifmsg(ifp); 1922 if (ifp->if_vlantrunk != NULL) 1923 (*vlan_link_state_p)(ifp); 1924 1925 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1926 IFP2AC(ifp)->ac_netgraph != NULL) 1927 (*ng_ether_link_state_p)(ifp, link_state); 1928 if (ifp->if_carp) 1929 (*carp_linkstate_p)(ifp); 1930 if (ifp->if_bridge) 1931 (*bridge_linkstate_p)(ifp); 1932 if (ifp->if_lagg) 1933 (*lagg_linkstate_p)(ifp, link_state); 1934 1935 if (IS_DEFAULT_VNET(curvnet)) 1936 devctl_notify("IFNET", ifp->if_xname, 1937 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1938 NULL); 1939 if (pending > 1) 1940 if_printf(ifp, "%d link states coalesced\n", pending); 1941 if (log_link_state_change) 1942 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1943 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1944 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1945 CURVNET_RESTORE(); 1946 } 1947 1948 /* 1949 * Mark an interface down and notify protocols of 1950 * the transition. 1951 */ 1952 void 1953 if_down(struct ifnet *ifp) 1954 { 1955 1956 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1957 } 1958 1959 /* 1960 * Mark an interface up and notify protocols of 1961 * the transition. 1962 */ 1963 void 1964 if_up(struct ifnet *ifp) 1965 { 1966 1967 if_route(ifp, IFF_UP, AF_UNSPEC); 1968 } 1969 1970 /* 1971 * Flush an interface queue. 1972 */ 1973 void 1974 if_qflush(struct ifnet *ifp) 1975 { 1976 struct mbuf *m, *n; 1977 struct ifaltq *ifq; 1978 1979 ifq = &ifp->if_snd; 1980 IFQ_LOCK(ifq); 1981 #ifdef ALTQ 1982 if (ALTQ_IS_ENABLED(ifq)) 1983 ALTQ_PURGE(ifq); 1984 #endif 1985 n = ifq->ifq_head; 1986 while ((m = n) != 0) { 1987 n = m->m_act; 1988 m_freem(m); 1989 } 1990 ifq->ifq_head = 0; 1991 ifq->ifq_tail = 0; 1992 ifq->ifq_len = 0; 1993 IFQ_UNLOCK(ifq); 1994 } 1995 1996 /* 1997 * Map interface name to interface structure pointer, with or without 1998 * returning a reference. 1999 */ 2000 struct ifnet * 2001 ifunit_ref(const char *name) 2002 { 2003 struct ifnet *ifp; 2004 2005 IFNET_RLOCK_NOSLEEP(); 2006 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2007 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2008 !(ifp->if_flags & IFF_DYING)) 2009 break; 2010 } 2011 if (ifp != NULL) 2012 if_ref(ifp); 2013 IFNET_RUNLOCK_NOSLEEP(); 2014 return (ifp); 2015 } 2016 2017 struct ifnet * 2018 ifunit(const char *name) 2019 { 2020 struct ifnet *ifp; 2021 2022 IFNET_RLOCK_NOSLEEP(); 2023 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2024 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2025 break; 2026 } 2027 IFNET_RUNLOCK_NOSLEEP(); 2028 return (ifp); 2029 } 2030 2031 /* 2032 * Hardware specific interface ioctls. 2033 */ 2034 static int 2035 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2036 { 2037 struct ifreq *ifr; 2038 struct ifstat *ifs; 2039 int error = 0; 2040 int new_flags, temp_flags; 2041 size_t namelen, onamelen; 2042 size_t descrlen; 2043 char *descrbuf, *odescrbuf; 2044 char new_name[IFNAMSIZ]; 2045 struct ifaddr *ifa; 2046 struct sockaddr_dl *sdl; 2047 2048 ifr = (struct ifreq *)data; 2049 switch (cmd) { 2050 case SIOCGIFINDEX: 2051 ifr->ifr_index = ifp->if_index; 2052 break; 2053 2054 case SIOCGIFFLAGS: 2055 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2056 ifr->ifr_flags = temp_flags & 0xffff; 2057 ifr->ifr_flagshigh = temp_flags >> 16; 2058 break; 2059 2060 case SIOCGIFCAP: 2061 ifr->ifr_reqcap = ifp->if_capabilities; 2062 ifr->ifr_curcap = ifp->if_capenable; 2063 break; 2064 2065 #ifdef MAC 2066 case SIOCGIFMAC: 2067 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2068 break; 2069 #endif 2070 2071 case SIOCGIFMETRIC: 2072 ifr->ifr_metric = ifp->if_metric; 2073 break; 2074 2075 case SIOCGIFMTU: 2076 ifr->ifr_mtu = ifp->if_mtu; 2077 break; 2078 2079 case SIOCGIFPHYS: 2080 ifr->ifr_phys = ifp->if_physical; 2081 break; 2082 2083 case SIOCGIFDESCR: 2084 error = 0; 2085 sx_slock(&ifdescr_sx); 2086 if (ifp->if_description == NULL) 2087 error = ENOMSG; 2088 else { 2089 /* space for terminating nul */ 2090 descrlen = strlen(ifp->if_description) + 1; 2091 if (ifr->ifr_buffer.length < descrlen) 2092 ifr->ifr_buffer.buffer = NULL; 2093 else 2094 error = copyout(ifp->if_description, 2095 ifr->ifr_buffer.buffer, descrlen); 2096 ifr->ifr_buffer.length = descrlen; 2097 } 2098 sx_sunlock(&ifdescr_sx); 2099 break; 2100 2101 case SIOCSIFDESCR: 2102 error = priv_check(td, PRIV_NET_SETIFDESCR); 2103 if (error) 2104 return (error); 2105 2106 /* 2107 * Copy only (length-1) bytes to make sure that 2108 * if_description is always nul terminated. The 2109 * length parameter is supposed to count the 2110 * terminating nul in. 2111 */ 2112 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2113 return (ENAMETOOLONG); 2114 else if (ifr->ifr_buffer.length == 0) 2115 descrbuf = NULL; 2116 else { 2117 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2118 M_WAITOK | M_ZERO); 2119 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2120 ifr->ifr_buffer.length - 1); 2121 if (error) { 2122 free(descrbuf, M_IFDESCR); 2123 break; 2124 } 2125 } 2126 2127 sx_xlock(&ifdescr_sx); 2128 odescrbuf = ifp->if_description; 2129 ifp->if_description = descrbuf; 2130 sx_xunlock(&ifdescr_sx); 2131 2132 getmicrotime(&ifp->if_lastchange); 2133 free(odescrbuf, M_IFDESCR); 2134 break; 2135 2136 case SIOCGIFFIB: 2137 ifr->ifr_fib = ifp->if_fib; 2138 break; 2139 2140 case SIOCSIFFIB: 2141 error = priv_check(td, PRIV_NET_SETIFFIB); 2142 if (error) 2143 return (error); 2144 if (ifr->ifr_fib >= rt_numfibs) 2145 return (EINVAL); 2146 2147 ifp->if_fib = ifr->ifr_fib; 2148 break; 2149 2150 case SIOCSIFFLAGS: 2151 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2152 if (error) 2153 return (error); 2154 /* 2155 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2156 * check, so we don't need special handling here yet. 2157 */ 2158 new_flags = (ifr->ifr_flags & 0xffff) | 2159 (ifr->ifr_flagshigh << 16); 2160 if (ifp->if_flags & IFF_SMART) { 2161 /* Smart drivers twiddle their own routes */ 2162 } else if (ifp->if_flags & IFF_UP && 2163 (new_flags & IFF_UP) == 0) { 2164 if_down(ifp); 2165 } else if (new_flags & IFF_UP && 2166 (ifp->if_flags & IFF_UP) == 0) { 2167 if_up(ifp); 2168 } 2169 /* See if permanently promiscuous mode bit is about to flip */ 2170 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2171 if (new_flags & IFF_PPROMISC) 2172 ifp->if_flags |= IFF_PROMISC; 2173 else if (ifp->if_pcount == 0) 2174 ifp->if_flags &= ~IFF_PROMISC; 2175 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2176 ifp->if_xname, 2177 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2178 } 2179 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2180 (new_flags &~ IFF_CANTCHANGE); 2181 if (ifp->if_ioctl) { 2182 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2183 } 2184 getmicrotime(&ifp->if_lastchange); 2185 break; 2186 2187 case SIOCSIFCAP: 2188 error = priv_check(td, PRIV_NET_SETIFCAP); 2189 if (error) 2190 return (error); 2191 if (ifp->if_ioctl == NULL) 2192 return (EOPNOTSUPP); 2193 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2194 return (EINVAL); 2195 error = (*ifp->if_ioctl)(ifp, cmd, data); 2196 if (error == 0) 2197 getmicrotime(&ifp->if_lastchange); 2198 break; 2199 2200 #ifdef MAC 2201 case SIOCSIFMAC: 2202 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2203 break; 2204 #endif 2205 2206 case SIOCSIFNAME: 2207 error = priv_check(td, PRIV_NET_SETIFNAME); 2208 if (error) 2209 return (error); 2210 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2211 if (error != 0) 2212 return (error); 2213 if (new_name[0] == '\0') 2214 return (EINVAL); 2215 if (ifunit(new_name) != NULL) 2216 return (EEXIST); 2217 2218 /* 2219 * XXX: Locking. Nothing else seems to lock if_flags, 2220 * and there are numerous other races with the 2221 * ifunit() checks not being atomic with namespace 2222 * changes (renames, vmoves, if_attach, etc). 2223 */ 2224 ifp->if_flags |= IFF_RENAMING; 2225 2226 /* Announce the departure of the interface. */ 2227 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2228 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2229 2230 log(LOG_INFO, "%s: changing name to '%s'\n", 2231 ifp->if_xname, new_name); 2232 2233 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2234 ifa = ifp->if_addr; 2235 IFA_LOCK(ifa); 2236 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2237 namelen = strlen(new_name); 2238 onamelen = sdl->sdl_nlen; 2239 /* 2240 * Move the address if needed. This is safe because we 2241 * allocate space for a name of length IFNAMSIZ when we 2242 * create this in if_attach(). 2243 */ 2244 if (namelen != onamelen) { 2245 bcopy(sdl->sdl_data + onamelen, 2246 sdl->sdl_data + namelen, sdl->sdl_alen); 2247 } 2248 bcopy(new_name, sdl->sdl_data, namelen); 2249 sdl->sdl_nlen = namelen; 2250 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2251 bzero(sdl->sdl_data, onamelen); 2252 while (namelen != 0) 2253 sdl->sdl_data[--namelen] = 0xff; 2254 IFA_UNLOCK(ifa); 2255 2256 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2257 /* Announce the return of the interface. */ 2258 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2259 2260 ifp->if_flags &= ~IFF_RENAMING; 2261 break; 2262 2263 #ifdef VIMAGE 2264 case SIOCSIFVNET: 2265 error = priv_check(td, PRIV_NET_SETIFVNET); 2266 if (error) 2267 return (error); 2268 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2269 break; 2270 #endif 2271 2272 case SIOCSIFMETRIC: 2273 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2274 if (error) 2275 return (error); 2276 ifp->if_metric = ifr->ifr_metric; 2277 getmicrotime(&ifp->if_lastchange); 2278 break; 2279 2280 case SIOCSIFPHYS: 2281 error = priv_check(td, PRIV_NET_SETIFPHYS); 2282 if (error) 2283 return (error); 2284 if (ifp->if_ioctl == NULL) 2285 return (EOPNOTSUPP); 2286 error = (*ifp->if_ioctl)(ifp, cmd, data); 2287 if (error == 0) 2288 getmicrotime(&ifp->if_lastchange); 2289 break; 2290 2291 case SIOCSIFMTU: 2292 { 2293 u_long oldmtu = ifp->if_mtu; 2294 2295 error = priv_check(td, PRIV_NET_SETIFMTU); 2296 if (error) 2297 return (error); 2298 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2299 return (EINVAL); 2300 if (ifp->if_ioctl == NULL) 2301 return (EOPNOTSUPP); 2302 error = (*ifp->if_ioctl)(ifp, cmd, data); 2303 if (error == 0) { 2304 getmicrotime(&ifp->if_lastchange); 2305 rt_ifmsg(ifp); 2306 } 2307 /* 2308 * If the link MTU changed, do network layer specific procedure. 2309 */ 2310 if (ifp->if_mtu != oldmtu) { 2311 #ifdef INET6 2312 nd6_setmtu(ifp); 2313 #endif 2314 } 2315 break; 2316 } 2317 2318 case SIOCADDMULTI: 2319 case SIOCDELMULTI: 2320 if (cmd == SIOCADDMULTI) 2321 error = priv_check(td, PRIV_NET_ADDMULTI); 2322 else 2323 error = priv_check(td, PRIV_NET_DELMULTI); 2324 if (error) 2325 return (error); 2326 2327 /* Don't allow group membership on non-multicast interfaces. */ 2328 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2329 return (EOPNOTSUPP); 2330 2331 /* Don't let users screw up protocols' entries. */ 2332 if (ifr->ifr_addr.sa_family != AF_LINK) 2333 return (EINVAL); 2334 2335 if (cmd == SIOCADDMULTI) { 2336 struct ifmultiaddr *ifma; 2337 2338 /* 2339 * Userland is only permitted to join groups once 2340 * via the if_addmulti() KPI, because it cannot hold 2341 * struct ifmultiaddr * between calls. It may also 2342 * lose a race while we check if the membership 2343 * already exists. 2344 */ 2345 IF_ADDR_RLOCK(ifp); 2346 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2347 IF_ADDR_RUNLOCK(ifp); 2348 if (ifma != NULL) 2349 error = EADDRINUSE; 2350 else 2351 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2352 } else { 2353 error = if_delmulti(ifp, &ifr->ifr_addr); 2354 } 2355 if (error == 0) 2356 getmicrotime(&ifp->if_lastchange); 2357 break; 2358 2359 case SIOCSIFPHYADDR: 2360 case SIOCDIFPHYADDR: 2361 #ifdef INET6 2362 case SIOCSIFPHYADDR_IN6: 2363 #endif 2364 case SIOCSLIFPHYADDR: 2365 case SIOCSIFMEDIA: 2366 case SIOCSIFGENERIC: 2367 error = priv_check(td, PRIV_NET_HWIOCTL); 2368 if (error) 2369 return (error); 2370 if (ifp->if_ioctl == NULL) 2371 return (EOPNOTSUPP); 2372 error = (*ifp->if_ioctl)(ifp, cmd, data); 2373 if (error == 0) 2374 getmicrotime(&ifp->if_lastchange); 2375 break; 2376 2377 case SIOCGIFSTATUS: 2378 ifs = (struct ifstat *)data; 2379 ifs->ascii[0] = '\0'; 2380 2381 case SIOCGIFPSRCADDR: 2382 case SIOCGIFPDSTADDR: 2383 case SIOCGLIFPHYADDR: 2384 case SIOCGIFMEDIA: 2385 case SIOCGIFGENERIC: 2386 if (ifp->if_ioctl == NULL) 2387 return (EOPNOTSUPP); 2388 error = (*ifp->if_ioctl)(ifp, cmd, data); 2389 break; 2390 2391 case SIOCSIFLLADDR: 2392 error = priv_check(td, PRIV_NET_SETLLADDR); 2393 if (error) 2394 return (error); 2395 error = if_setlladdr(ifp, 2396 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2397 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2398 break; 2399 2400 case SIOCAIFGROUP: 2401 { 2402 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2403 2404 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2405 if (error) 2406 return (error); 2407 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2408 return (error); 2409 break; 2410 } 2411 2412 case SIOCGIFGROUP: 2413 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2414 return (error); 2415 break; 2416 2417 case SIOCDIFGROUP: 2418 { 2419 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2420 2421 error = priv_check(td, PRIV_NET_DELIFGROUP); 2422 if (error) 2423 return (error); 2424 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2425 return (error); 2426 break; 2427 } 2428 2429 default: 2430 error = ENOIOCTL; 2431 break; 2432 } 2433 return (error); 2434 } 2435 2436 #ifdef COMPAT_FREEBSD32 2437 struct ifconf32 { 2438 int32_t ifc_len; 2439 union { 2440 uint32_t ifcu_buf; 2441 uint32_t ifcu_req; 2442 } ifc_ifcu; 2443 }; 2444 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2445 #endif 2446 2447 /* 2448 * Interface ioctls. 2449 */ 2450 int 2451 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2452 { 2453 struct ifnet *ifp; 2454 struct ifreq *ifr; 2455 int error; 2456 int oif_flags; 2457 2458 CURVNET_SET(so->so_vnet); 2459 switch (cmd) { 2460 case SIOCGIFCONF: 2461 case OSIOCGIFCONF: 2462 error = ifconf(cmd, data); 2463 CURVNET_RESTORE(); 2464 return (error); 2465 2466 #ifdef COMPAT_FREEBSD32 2467 case SIOCGIFCONF32: 2468 { 2469 struct ifconf32 *ifc32; 2470 struct ifconf ifc; 2471 2472 ifc32 = (struct ifconf32 *)data; 2473 ifc.ifc_len = ifc32->ifc_len; 2474 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2475 2476 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2477 CURVNET_RESTORE(); 2478 if (error == 0) 2479 ifc32->ifc_len = ifc.ifc_len; 2480 return (error); 2481 } 2482 #endif 2483 } 2484 ifr = (struct ifreq *)data; 2485 2486 switch (cmd) { 2487 #ifdef VIMAGE 2488 case SIOCSIFRVNET: 2489 error = priv_check(td, PRIV_NET_SETIFVNET); 2490 if (error == 0) 2491 error = if_vmove_reclaim(td, ifr->ifr_name, 2492 ifr->ifr_jid); 2493 CURVNET_RESTORE(); 2494 return (error); 2495 #endif 2496 case SIOCIFCREATE: 2497 case SIOCIFCREATE2: 2498 error = priv_check(td, PRIV_NET_IFCREATE); 2499 if (error == 0) 2500 error = if_clone_create(ifr->ifr_name, 2501 sizeof(ifr->ifr_name), 2502 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2503 CURVNET_RESTORE(); 2504 return (error); 2505 case SIOCIFDESTROY: 2506 error = priv_check(td, PRIV_NET_IFDESTROY); 2507 if (error == 0) 2508 error = if_clone_destroy(ifr->ifr_name); 2509 CURVNET_RESTORE(); 2510 return (error); 2511 2512 case SIOCIFGCLONERS: 2513 error = if_clone_list((struct if_clonereq *)data); 2514 CURVNET_RESTORE(); 2515 return (error); 2516 case SIOCGIFGMEMB: 2517 error = if_getgroupmembers((struct ifgroupreq *)data); 2518 CURVNET_RESTORE(); 2519 return (error); 2520 #if defined(INET) || defined(INET6) 2521 case SIOCSVH: 2522 case SIOCGVH: 2523 if (carp_ioctl_p == NULL) 2524 error = EPROTONOSUPPORT; 2525 else 2526 error = (*carp_ioctl_p)(ifr, cmd, td); 2527 CURVNET_RESTORE(); 2528 return (error); 2529 #endif 2530 } 2531 2532 ifp = ifunit_ref(ifr->ifr_name); 2533 if (ifp == NULL) { 2534 CURVNET_RESTORE(); 2535 return (ENXIO); 2536 } 2537 2538 error = ifhwioctl(cmd, ifp, data, td); 2539 if (error != ENOIOCTL) { 2540 if_rele(ifp); 2541 CURVNET_RESTORE(); 2542 return (error); 2543 } 2544 2545 oif_flags = ifp->if_flags; 2546 if (so->so_proto == NULL) { 2547 if_rele(ifp); 2548 CURVNET_RESTORE(); 2549 return (EOPNOTSUPP); 2550 } 2551 #ifndef COMPAT_43 2552 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2553 data, 2554 ifp, td)); 2555 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2556 error = (*ifp->if_ioctl)(ifp, cmd, data); 2557 #else 2558 { 2559 u_long ocmd = cmd; 2560 2561 switch (cmd) { 2562 2563 case SIOCSIFDSTADDR: 2564 case SIOCSIFADDR: 2565 case SIOCSIFBRDADDR: 2566 case SIOCSIFNETMASK: 2567 #if BYTE_ORDER != BIG_ENDIAN 2568 if (ifr->ifr_addr.sa_family == 0 && 2569 ifr->ifr_addr.sa_len < 16) { 2570 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2571 ifr->ifr_addr.sa_len = 16; 2572 } 2573 #else 2574 if (ifr->ifr_addr.sa_len == 0) 2575 ifr->ifr_addr.sa_len = 16; 2576 #endif 2577 break; 2578 2579 case OSIOCGIFADDR: 2580 cmd = SIOCGIFADDR; 2581 break; 2582 2583 case OSIOCGIFDSTADDR: 2584 cmd = SIOCGIFDSTADDR; 2585 break; 2586 2587 case OSIOCGIFBRDADDR: 2588 cmd = SIOCGIFBRDADDR; 2589 break; 2590 2591 case OSIOCGIFNETMASK: 2592 cmd = SIOCGIFNETMASK; 2593 } 2594 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2595 cmd, 2596 data, 2597 ifp, td)); 2598 if (error == EOPNOTSUPP && ifp != NULL && 2599 ifp->if_ioctl != NULL) 2600 error = (*ifp->if_ioctl)(ifp, cmd, data); 2601 switch (ocmd) { 2602 2603 case OSIOCGIFADDR: 2604 case OSIOCGIFDSTADDR: 2605 case OSIOCGIFBRDADDR: 2606 case OSIOCGIFNETMASK: 2607 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2608 2609 } 2610 } 2611 #endif /* COMPAT_43 */ 2612 2613 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2614 #ifdef INET6 2615 if (ifp->if_flags & IFF_UP) 2616 in6_if_up(ifp); 2617 #endif 2618 } 2619 if_rele(ifp); 2620 CURVNET_RESTORE(); 2621 return (error); 2622 } 2623 2624 /* 2625 * The code common to handling reference counted flags, 2626 * e.g., in ifpromisc() and if_allmulti(). 2627 * The "pflag" argument can specify a permanent mode flag to check, 2628 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2629 * 2630 * Only to be used on stack-owned flags, not driver-owned flags. 2631 */ 2632 static int 2633 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2634 { 2635 struct ifreq ifr; 2636 int error; 2637 int oldflags, oldcount; 2638 2639 /* Sanity checks to catch programming errors */ 2640 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2641 ("%s: setting driver-owned flag %d", __func__, flag)); 2642 2643 if (onswitch) 2644 KASSERT(*refcount >= 0, 2645 ("%s: increment negative refcount %d for flag %d", 2646 __func__, *refcount, flag)); 2647 else 2648 KASSERT(*refcount > 0, 2649 ("%s: decrement non-positive refcount %d for flag %d", 2650 __func__, *refcount, flag)); 2651 2652 /* In case this mode is permanent, just touch refcount */ 2653 if (ifp->if_flags & pflag) { 2654 *refcount += onswitch ? 1 : -1; 2655 return (0); 2656 } 2657 2658 /* Save ifnet parameters for if_ioctl() may fail */ 2659 oldcount = *refcount; 2660 oldflags = ifp->if_flags; 2661 2662 /* 2663 * See if we aren't the only and touching refcount is enough. 2664 * Actually toggle interface flag if we are the first or last. 2665 */ 2666 if (onswitch) { 2667 if ((*refcount)++) 2668 return (0); 2669 ifp->if_flags |= flag; 2670 } else { 2671 if (--(*refcount)) 2672 return (0); 2673 ifp->if_flags &= ~flag; 2674 } 2675 2676 /* Call down the driver since we've changed interface flags */ 2677 if (ifp->if_ioctl == NULL) { 2678 error = EOPNOTSUPP; 2679 goto recover; 2680 } 2681 ifr.ifr_flags = ifp->if_flags & 0xffff; 2682 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2683 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2684 if (error) 2685 goto recover; 2686 /* Notify userland that interface flags have changed */ 2687 rt_ifmsg(ifp); 2688 return (0); 2689 2690 recover: 2691 /* Recover after driver error */ 2692 *refcount = oldcount; 2693 ifp->if_flags = oldflags; 2694 return (error); 2695 } 2696 2697 /* 2698 * Set/clear promiscuous mode on interface ifp based on the truth value 2699 * of pswitch. The calls are reference counted so that only the first 2700 * "on" request actually has an effect, as does the final "off" request. 2701 * Results are undefined if the "off" and "on" requests are not matched. 2702 */ 2703 int 2704 ifpromisc(struct ifnet *ifp, int pswitch) 2705 { 2706 int error; 2707 int oldflags = ifp->if_flags; 2708 2709 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2710 &ifp->if_pcount, pswitch); 2711 /* If promiscuous mode status has changed, log a message */ 2712 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2713 log(LOG_INFO, "%s: promiscuous mode %s\n", 2714 ifp->if_xname, 2715 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2716 return (error); 2717 } 2718 2719 /* 2720 * Return interface configuration 2721 * of system. List may be used 2722 * in later ioctl's (above) to get 2723 * other information. 2724 */ 2725 /*ARGSUSED*/ 2726 static int 2727 ifconf(u_long cmd, caddr_t data) 2728 { 2729 struct ifconf *ifc = (struct ifconf *)data; 2730 struct ifnet *ifp; 2731 struct ifaddr *ifa; 2732 struct ifreq ifr; 2733 struct sbuf *sb; 2734 int error, full = 0, valid_len, max_len; 2735 2736 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2737 max_len = MAXPHYS - 1; 2738 2739 /* Prevent hostile input from being able to crash the system */ 2740 if (ifc->ifc_len <= 0) 2741 return (EINVAL); 2742 2743 again: 2744 if (ifc->ifc_len <= max_len) { 2745 max_len = ifc->ifc_len; 2746 full = 1; 2747 } 2748 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2749 max_len = 0; 2750 valid_len = 0; 2751 2752 IFNET_RLOCK(); 2753 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2754 int addrs; 2755 2756 /* 2757 * Zero the ifr_name buffer to make sure we don't 2758 * disclose the contents of the stack. 2759 */ 2760 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2761 2762 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2763 >= sizeof(ifr.ifr_name)) { 2764 sbuf_delete(sb); 2765 IFNET_RUNLOCK(); 2766 return (ENAMETOOLONG); 2767 } 2768 2769 addrs = 0; 2770 IF_ADDR_RLOCK(ifp); 2771 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2772 struct sockaddr *sa = ifa->ifa_addr; 2773 2774 if (prison_if(curthread->td_ucred, sa) != 0) 2775 continue; 2776 addrs++; 2777 #ifdef COMPAT_43 2778 if (cmd == OSIOCGIFCONF) { 2779 struct osockaddr *osa = 2780 (struct osockaddr *)&ifr.ifr_addr; 2781 ifr.ifr_addr = *sa; 2782 osa->sa_family = sa->sa_family; 2783 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2784 max_len += sizeof(ifr); 2785 } else 2786 #endif 2787 if (sa->sa_len <= sizeof(*sa)) { 2788 ifr.ifr_addr = *sa; 2789 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2790 max_len += sizeof(ifr); 2791 } else { 2792 sbuf_bcat(sb, &ifr, 2793 offsetof(struct ifreq, ifr_addr)); 2794 max_len += offsetof(struct ifreq, ifr_addr); 2795 sbuf_bcat(sb, sa, sa->sa_len); 2796 max_len += sa->sa_len; 2797 } 2798 2799 if (sbuf_error(sb) == 0) 2800 valid_len = sbuf_len(sb); 2801 } 2802 IF_ADDR_RUNLOCK(ifp); 2803 if (addrs == 0) { 2804 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2805 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2806 max_len += sizeof(ifr); 2807 2808 if (sbuf_error(sb) == 0) 2809 valid_len = sbuf_len(sb); 2810 } 2811 } 2812 IFNET_RUNLOCK(); 2813 2814 /* 2815 * If we didn't allocate enough space (uncommon), try again. If 2816 * we have already allocated as much space as we are allowed, 2817 * return what we've got. 2818 */ 2819 if (valid_len != max_len && !full) { 2820 sbuf_delete(sb); 2821 goto again; 2822 } 2823 2824 ifc->ifc_len = valid_len; 2825 sbuf_finish(sb); 2826 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2827 sbuf_delete(sb); 2828 return (error); 2829 } 2830 2831 /* 2832 * Just like ifpromisc(), but for all-multicast-reception mode. 2833 */ 2834 int 2835 if_allmulti(struct ifnet *ifp, int onswitch) 2836 { 2837 2838 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2839 } 2840 2841 struct ifmultiaddr * 2842 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2843 { 2844 struct ifmultiaddr *ifma; 2845 2846 IF_ADDR_LOCK_ASSERT(ifp); 2847 2848 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2849 if (sa->sa_family == AF_LINK) { 2850 if (sa_dl_equal(ifma->ifma_addr, sa)) 2851 break; 2852 } else { 2853 if (sa_equal(ifma->ifma_addr, sa)) 2854 break; 2855 } 2856 } 2857 2858 return ifma; 2859 } 2860 2861 /* 2862 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2863 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2864 * the ifnet multicast address list here, so the caller must do that and 2865 * other setup work (such as notifying the device driver). The reference 2866 * count is initialized to 1. 2867 */ 2868 static struct ifmultiaddr * 2869 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2870 int mflags) 2871 { 2872 struct ifmultiaddr *ifma; 2873 struct sockaddr *dupsa; 2874 2875 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2876 M_ZERO); 2877 if (ifma == NULL) 2878 return (NULL); 2879 2880 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2881 if (dupsa == NULL) { 2882 free(ifma, M_IFMADDR); 2883 return (NULL); 2884 } 2885 bcopy(sa, dupsa, sa->sa_len); 2886 ifma->ifma_addr = dupsa; 2887 2888 ifma->ifma_ifp = ifp; 2889 ifma->ifma_refcount = 1; 2890 ifma->ifma_protospec = NULL; 2891 2892 if (llsa == NULL) { 2893 ifma->ifma_lladdr = NULL; 2894 return (ifma); 2895 } 2896 2897 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2898 if (dupsa == NULL) { 2899 free(ifma->ifma_addr, M_IFMADDR); 2900 free(ifma, M_IFMADDR); 2901 return (NULL); 2902 } 2903 bcopy(llsa, dupsa, llsa->sa_len); 2904 ifma->ifma_lladdr = dupsa; 2905 2906 return (ifma); 2907 } 2908 2909 /* 2910 * if_freemulti: free ifmultiaddr structure and possibly attached related 2911 * addresses. The caller is responsible for implementing reference 2912 * counting, notifying the driver, handling routing messages, and releasing 2913 * any dependent link layer state. 2914 */ 2915 static void 2916 if_freemulti(struct ifmultiaddr *ifma) 2917 { 2918 2919 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2920 ifma->ifma_refcount)); 2921 KASSERT(ifma->ifma_protospec == NULL, 2922 ("if_freemulti: protospec not NULL")); 2923 2924 if (ifma->ifma_lladdr != NULL) 2925 free(ifma->ifma_lladdr, M_IFMADDR); 2926 free(ifma->ifma_addr, M_IFMADDR); 2927 free(ifma, M_IFMADDR); 2928 } 2929 2930 /* 2931 * Register an additional multicast address with a network interface. 2932 * 2933 * - If the address is already present, bump the reference count on the 2934 * address and return. 2935 * - If the address is not link-layer, look up a link layer address. 2936 * - Allocate address structures for one or both addresses, and attach to the 2937 * multicast address list on the interface. If automatically adding a link 2938 * layer address, the protocol address will own a reference to the link 2939 * layer address, to be freed when it is freed. 2940 * - Notify the network device driver of an addition to the multicast address 2941 * list. 2942 * 2943 * 'sa' points to caller-owned memory with the desired multicast address. 2944 * 2945 * 'retifma' will be used to return a pointer to the resulting multicast 2946 * address reference, if desired. 2947 */ 2948 int 2949 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2950 struct ifmultiaddr **retifma) 2951 { 2952 struct ifmultiaddr *ifma, *ll_ifma; 2953 struct sockaddr *llsa; 2954 int error; 2955 2956 /* 2957 * If the address is already present, return a new reference to it; 2958 * otherwise, allocate storage and set up a new address. 2959 */ 2960 IF_ADDR_WLOCK(ifp); 2961 ifma = if_findmulti(ifp, sa); 2962 if (ifma != NULL) { 2963 ifma->ifma_refcount++; 2964 if (retifma != NULL) 2965 *retifma = ifma; 2966 IF_ADDR_WUNLOCK(ifp); 2967 return (0); 2968 } 2969 2970 /* 2971 * The address isn't already present; resolve the protocol address 2972 * into a link layer address, and then look that up, bump its 2973 * refcount or allocate an ifma for that also. If 'llsa' was 2974 * returned, we will need to free it later. 2975 */ 2976 llsa = NULL; 2977 ll_ifma = NULL; 2978 if (ifp->if_resolvemulti != NULL) { 2979 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2980 if (error) 2981 goto unlock_out; 2982 } 2983 2984 /* 2985 * Allocate the new address. Don't hook it up yet, as we may also 2986 * need to allocate a link layer multicast address. 2987 */ 2988 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2989 if (ifma == NULL) { 2990 error = ENOMEM; 2991 goto free_llsa_out; 2992 } 2993 2994 /* 2995 * If a link layer address is found, we'll need to see if it's 2996 * already present in the address list, or allocate is as well. 2997 * When this block finishes, the link layer address will be on the 2998 * list. 2999 */ 3000 if (llsa != NULL) { 3001 ll_ifma = if_findmulti(ifp, llsa); 3002 if (ll_ifma == NULL) { 3003 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3004 if (ll_ifma == NULL) { 3005 --ifma->ifma_refcount; 3006 if_freemulti(ifma); 3007 error = ENOMEM; 3008 goto free_llsa_out; 3009 } 3010 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3011 ifma_link); 3012 } else 3013 ll_ifma->ifma_refcount++; 3014 ifma->ifma_llifma = ll_ifma; 3015 } 3016 3017 /* 3018 * We now have a new multicast address, ifma, and possibly a new or 3019 * referenced link layer address. Add the primary address to the 3020 * ifnet address list. 3021 */ 3022 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3023 3024 if (retifma != NULL) 3025 *retifma = ifma; 3026 3027 /* 3028 * Must generate the message while holding the lock so that 'ifma' 3029 * pointer is still valid. 3030 */ 3031 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3032 IF_ADDR_WUNLOCK(ifp); 3033 3034 /* 3035 * We are certain we have added something, so call down to the 3036 * interface to let them know about it. 3037 */ 3038 if (ifp->if_ioctl != NULL) { 3039 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3040 } 3041 3042 if (llsa != NULL) 3043 free(llsa, M_IFMADDR); 3044 3045 return (0); 3046 3047 free_llsa_out: 3048 if (llsa != NULL) 3049 free(llsa, M_IFMADDR); 3050 3051 unlock_out: 3052 IF_ADDR_WUNLOCK(ifp); 3053 return (error); 3054 } 3055 3056 /* 3057 * Delete a multicast group membership by network-layer group address. 3058 * 3059 * Returns ENOENT if the entry could not be found. If ifp no longer 3060 * exists, results are undefined. This entry point should only be used 3061 * from subsystems which do appropriate locking to hold ifp for the 3062 * duration of the call. 3063 * Network-layer protocol domains must use if_delmulti_ifma(). 3064 */ 3065 int 3066 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3067 { 3068 struct ifmultiaddr *ifma; 3069 int lastref; 3070 #ifdef INVARIANTS 3071 struct ifnet *oifp; 3072 3073 IFNET_RLOCK_NOSLEEP(); 3074 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3075 if (ifp == oifp) 3076 break; 3077 if (ifp != oifp) 3078 ifp = NULL; 3079 IFNET_RUNLOCK_NOSLEEP(); 3080 3081 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3082 #endif 3083 if (ifp == NULL) 3084 return (ENOENT); 3085 3086 IF_ADDR_WLOCK(ifp); 3087 lastref = 0; 3088 ifma = if_findmulti(ifp, sa); 3089 if (ifma != NULL) 3090 lastref = if_delmulti_locked(ifp, ifma, 0); 3091 IF_ADDR_WUNLOCK(ifp); 3092 3093 if (ifma == NULL) 3094 return (ENOENT); 3095 3096 if (lastref && ifp->if_ioctl != NULL) { 3097 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3098 } 3099 3100 return (0); 3101 } 3102 3103 /* 3104 * Delete all multicast group membership for an interface. 3105 * Should be used to quickly flush all multicast filters. 3106 */ 3107 void 3108 if_delallmulti(struct ifnet *ifp) 3109 { 3110 struct ifmultiaddr *ifma; 3111 struct ifmultiaddr *next; 3112 3113 IF_ADDR_WLOCK(ifp); 3114 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3115 if_delmulti_locked(ifp, ifma, 0); 3116 IF_ADDR_WUNLOCK(ifp); 3117 } 3118 3119 /* 3120 * Delete a multicast group membership by group membership pointer. 3121 * Network-layer protocol domains must use this routine. 3122 * 3123 * It is safe to call this routine if the ifp disappeared. 3124 */ 3125 void 3126 if_delmulti_ifma(struct ifmultiaddr *ifma) 3127 { 3128 struct ifnet *ifp; 3129 int lastref; 3130 3131 ifp = ifma->ifma_ifp; 3132 #ifdef DIAGNOSTIC 3133 if (ifp == NULL) { 3134 printf("%s: ifma_ifp seems to be detached\n", __func__); 3135 } else { 3136 struct ifnet *oifp; 3137 3138 IFNET_RLOCK_NOSLEEP(); 3139 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3140 if (ifp == oifp) 3141 break; 3142 if (ifp != oifp) { 3143 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3144 ifp = NULL; 3145 } 3146 IFNET_RUNLOCK_NOSLEEP(); 3147 } 3148 #endif 3149 /* 3150 * If and only if the ifnet instance exists: Acquire the address lock. 3151 */ 3152 if (ifp != NULL) 3153 IF_ADDR_WLOCK(ifp); 3154 3155 lastref = if_delmulti_locked(ifp, ifma, 0); 3156 3157 if (ifp != NULL) { 3158 /* 3159 * If and only if the ifnet instance exists: 3160 * Release the address lock. 3161 * If the group was left: update the hardware hash filter. 3162 */ 3163 IF_ADDR_WUNLOCK(ifp); 3164 if (lastref && ifp->if_ioctl != NULL) { 3165 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3166 } 3167 } 3168 } 3169 3170 /* 3171 * Perform deletion of network-layer and/or link-layer multicast address. 3172 * 3173 * Return 0 if the reference count was decremented. 3174 * Return 1 if the final reference was released, indicating that the 3175 * hardware hash filter should be reprogrammed. 3176 */ 3177 static int 3178 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3179 { 3180 struct ifmultiaddr *ll_ifma; 3181 3182 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3183 KASSERT(ifma->ifma_ifp == ifp, 3184 ("%s: inconsistent ifp %p", __func__, ifp)); 3185 IF_ADDR_WLOCK_ASSERT(ifp); 3186 } 3187 3188 ifp = ifma->ifma_ifp; 3189 3190 /* 3191 * If the ifnet is detaching, null out references to ifnet, 3192 * so that upper protocol layers will notice, and not attempt 3193 * to obtain locks for an ifnet which no longer exists. The 3194 * routing socket announcement must happen before the ifnet 3195 * instance is detached from the system. 3196 */ 3197 if (detaching) { 3198 #ifdef DIAGNOSTIC 3199 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3200 #endif 3201 /* 3202 * ifp may already be nulled out if we are being reentered 3203 * to delete the ll_ifma. 3204 */ 3205 if (ifp != NULL) { 3206 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3207 ifma->ifma_ifp = NULL; 3208 } 3209 } 3210 3211 if (--ifma->ifma_refcount > 0) 3212 return 0; 3213 3214 /* 3215 * If this ifma is a network-layer ifma, a link-layer ifma may 3216 * have been associated with it. Release it first if so. 3217 */ 3218 ll_ifma = ifma->ifma_llifma; 3219 if (ll_ifma != NULL) { 3220 KASSERT(ifma->ifma_lladdr != NULL, 3221 ("%s: llifma w/o lladdr", __func__)); 3222 if (detaching) 3223 ll_ifma->ifma_ifp = NULL; /* XXX */ 3224 if (--ll_ifma->ifma_refcount == 0) { 3225 if (ifp != NULL) { 3226 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3227 ifma_link); 3228 } 3229 if_freemulti(ll_ifma); 3230 } 3231 } 3232 3233 if (ifp != NULL) 3234 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3235 3236 if_freemulti(ifma); 3237 3238 /* 3239 * The last reference to this instance of struct ifmultiaddr 3240 * was released; the hardware should be notified of this change. 3241 */ 3242 return 1; 3243 } 3244 3245 /* 3246 * Set the link layer address on an interface. 3247 * 3248 * At this time we only support certain types of interfaces, 3249 * and we don't allow the length of the address to change. 3250 */ 3251 int 3252 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3253 { 3254 struct sockaddr_dl *sdl; 3255 struct ifaddr *ifa; 3256 struct ifreq ifr; 3257 3258 IF_ADDR_RLOCK(ifp); 3259 ifa = ifp->if_addr; 3260 if (ifa == NULL) { 3261 IF_ADDR_RUNLOCK(ifp); 3262 return (EINVAL); 3263 } 3264 ifa_ref(ifa); 3265 IF_ADDR_RUNLOCK(ifp); 3266 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3267 if (sdl == NULL) { 3268 ifa_free(ifa); 3269 return (EINVAL); 3270 } 3271 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3272 ifa_free(ifa); 3273 return (EINVAL); 3274 } 3275 switch (ifp->if_type) { 3276 case IFT_ETHER: 3277 case IFT_FDDI: 3278 case IFT_XETHER: 3279 case IFT_ISO88025: 3280 case IFT_L2VLAN: 3281 case IFT_BRIDGE: 3282 case IFT_ARCNET: 3283 case IFT_IEEE8023ADLAG: 3284 case IFT_IEEE80211: 3285 bcopy(lladdr, LLADDR(sdl), len); 3286 ifa_free(ifa); 3287 break; 3288 default: 3289 ifa_free(ifa); 3290 return (ENODEV); 3291 } 3292 3293 /* 3294 * If the interface is already up, we need 3295 * to re-init it in order to reprogram its 3296 * address filter. 3297 */ 3298 if ((ifp->if_flags & IFF_UP) != 0) { 3299 if (ifp->if_ioctl) { 3300 ifp->if_flags &= ~IFF_UP; 3301 ifr.ifr_flags = ifp->if_flags & 0xffff; 3302 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3303 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3304 ifp->if_flags |= IFF_UP; 3305 ifr.ifr_flags = ifp->if_flags & 0xffff; 3306 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3307 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3308 } 3309 #ifdef INET 3310 /* 3311 * Also send gratuitous ARPs to notify other nodes about 3312 * the address change. 3313 */ 3314 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3315 if (ifa->ifa_addr->sa_family == AF_INET) 3316 arp_ifinit(ifp, ifa); 3317 } 3318 #endif 3319 } 3320 return (0); 3321 } 3322 3323 /* 3324 * The name argument must be a pointer to storage which will last as 3325 * long as the interface does. For physical devices, the result of 3326 * device_get_name(dev) is a good choice and for pseudo-devices a 3327 * static string works well. 3328 */ 3329 void 3330 if_initname(struct ifnet *ifp, const char *name, int unit) 3331 { 3332 ifp->if_dname = name; 3333 ifp->if_dunit = unit; 3334 if (unit != IF_DUNIT_NONE) 3335 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3336 else 3337 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3338 } 3339 3340 int 3341 if_printf(struct ifnet *ifp, const char * fmt, ...) 3342 { 3343 va_list ap; 3344 int retval; 3345 3346 retval = printf("%s: ", ifp->if_xname); 3347 va_start(ap, fmt); 3348 retval += vprintf(fmt, ap); 3349 va_end(ap); 3350 return (retval); 3351 } 3352 3353 void 3354 if_start(struct ifnet *ifp) 3355 { 3356 3357 (*(ifp)->if_start)(ifp); 3358 } 3359 3360 /* 3361 * Backwards compatibility interface for drivers 3362 * that have not implemented it 3363 */ 3364 static int 3365 if_transmit(struct ifnet *ifp, struct mbuf *m) 3366 { 3367 int error; 3368 3369 IFQ_HANDOFF(ifp, m, error); 3370 return (error); 3371 } 3372 3373 int 3374 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3375 { 3376 int active = 0; 3377 3378 IF_LOCK(ifq); 3379 if (_IF_QFULL(ifq)) { 3380 _IF_DROP(ifq); 3381 IF_UNLOCK(ifq); 3382 m_freem(m); 3383 return (0); 3384 } 3385 if (ifp != NULL) { 3386 ifp->if_obytes += m->m_pkthdr.len + adjust; 3387 if (m->m_flags & (M_BCAST|M_MCAST)) 3388 ifp->if_omcasts++; 3389 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3390 } 3391 _IF_ENQUEUE(ifq, m); 3392 IF_UNLOCK(ifq); 3393 if (ifp != NULL && !active) 3394 (*(ifp)->if_start)(ifp); 3395 return (1); 3396 } 3397 3398 void 3399 if_register_com_alloc(u_char type, 3400 if_com_alloc_t *a, if_com_free_t *f) 3401 { 3402 3403 KASSERT(if_com_alloc[type] == NULL, 3404 ("if_register_com_alloc: %d already registered", type)); 3405 KASSERT(if_com_free[type] == NULL, 3406 ("if_register_com_alloc: %d free already registered", type)); 3407 3408 if_com_alloc[type] = a; 3409 if_com_free[type] = f; 3410 } 3411 3412 void 3413 if_deregister_com_alloc(u_char type) 3414 { 3415 3416 KASSERT(if_com_alloc[type] != NULL, 3417 ("if_deregister_com_alloc: %d not registered", type)); 3418 KASSERT(if_com_free[type] != NULL, 3419 ("if_deregister_com_alloc: %d free not registered", type)); 3420 if_com_alloc[type] = NULL; 3421 if_com_free[type] = NULL; 3422 } 3423