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 /*XXX*/ 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #include <netinet/ip_carp.h> 81 #ifdef INET6 82 #include <netinet6/in6_var.h> 83 #include <netinet6/in6_ifattach.h> 84 #endif 85 #endif 86 #ifdef INET 87 #include <netinet/if_ether.h> 88 #endif 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 #if defined(INET) || defined(INET6) 134 int (*carp_forus_p)(struct ifnet *ifp, u_char *dhost); 135 int (*carp_output_p)(struct ifnet *ifp, struct mbuf *m, 136 struct sockaddr *sa); 137 int (*carp_ioctl_p)(struct ifreq *, u_long, struct thread *); 138 int (*carp_attach_p)(struct ifaddr *, int); 139 void (*carp_detach_p)(struct ifaddr *); 140 #endif 141 #ifdef INET 142 int (*carp_iamatch_p)(struct ifaddr *, uint8_t **); 143 #endif 144 #ifdef INET6 145 struct ifaddr *(*carp_iamatch6_p)(struct ifnet *ifp, struct in6_addr *taddr6); 146 caddr_t (*carp_macmatch6_p)(struct ifnet *ifp, struct mbuf *m, 147 const struct in6_addr *taddr); 148 #endif 149 150 struct mbuf *(*tbr_dequeue_ptr)(struct ifaltq *, int) = NULL; 151 152 /* 153 * XXX: Style; these should be sorted alphabetically, and unprototyped 154 * static functions should be prototyped. Currently they are sorted by 155 * declaration order. 156 */ 157 static void if_attachdomain(void *); 158 static void if_attachdomain1(struct ifnet *); 159 static int ifconf(u_long, caddr_t); 160 static void if_freemulti(struct ifmultiaddr *); 161 static void if_init(void *); 162 static void if_grow(void); 163 static void if_route(struct ifnet *, int flag, int fam); 164 static int if_setflag(struct ifnet *, int, int, int *, int); 165 static int if_transmit(struct ifnet *ifp, struct mbuf *m); 166 static void if_unroute(struct ifnet *, int flag, int fam); 167 static void link_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 168 static int if_rtdel(struct radix_node *, void *); 169 static int ifhwioctl(u_long, struct ifnet *, caddr_t, struct thread *); 170 static int if_delmulti_locked(struct ifnet *, struct ifmultiaddr *, int); 171 static void do_link_state_change(void *, int); 172 static int if_getgroup(struct ifgroupreq *, struct ifnet *); 173 static int if_getgroupmembers(struct ifgroupreq *); 174 static void if_delgroups(struct ifnet *); 175 static void if_attach_internal(struct ifnet *, int); 176 static void if_detach_internal(struct ifnet *, int); 177 178 #ifdef INET6 179 /* 180 * XXX: declare here to avoid to include many inet6 related files.. 181 * should be more generalized? 182 */ 183 extern void nd6_setmtu(struct ifnet *); 184 #endif 185 186 VNET_DEFINE(int, if_index); 187 int ifqmaxlen = IFQ_MAXLEN; 188 VNET_DEFINE(struct ifnethead, ifnet); /* depend on static init XXX */ 189 VNET_DEFINE(struct ifgrouphead, ifg_head); 190 191 static VNET_DEFINE(int, if_indexlim) = 8; 192 193 /* Table of ifnet by index. */ 194 VNET_DEFINE(struct ifindex_entry *, ifindex_table); 195 196 #define V_if_indexlim VNET(if_indexlim) 197 #define V_ifindex_table VNET(ifindex_table) 198 199 /* 200 * The global network interface list (V_ifnet) and related state (such as 201 * if_index, if_indexlim, and ifindex_table) are protected by an sxlock and 202 * an rwlock. Either may be acquired shared to stablize the list, but both 203 * must be acquired writable to modify the list. This model allows us to 204 * both stablize the interface list during interrupt thread processing, but 205 * also to stablize it over long-running ioctls, without introducing priority 206 * inversions and deadlocks. 207 */ 208 struct rwlock ifnet_rwlock; 209 struct sx ifnet_sxlock; 210 211 /* 212 * The allocation of network interfaces is a rather non-atomic affair; we 213 * need to select an index before we are ready to expose the interface for 214 * use, so will use this pointer value to indicate reservation. 215 */ 216 #define IFNET_HOLD (void *)(uintptr_t)(-1) 217 218 static if_com_alloc_t *if_com_alloc[256]; 219 static if_com_free_t *if_com_free[256]; 220 221 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 222 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 223 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 224 225 struct ifnet * 226 ifnet_byindex_locked(u_short idx) 227 { 228 229 if (idx > V_if_index) 230 return (NULL); 231 if (V_ifindex_table[idx].ife_ifnet == IFNET_HOLD) 232 return (NULL); 233 return (V_ifindex_table[idx].ife_ifnet); 234 } 235 236 struct ifnet * 237 ifnet_byindex(u_short idx) 238 { 239 struct ifnet *ifp; 240 241 IFNET_RLOCK_NOSLEEP(); 242 ifp = ifnet_byindex_locked(idx); 243 IFNET_RUNLOCK_NOSLEEP(); 244 return (ifp); 245 } 246 247 struct ifnet * 248 ifnet_byindex_ref(u_short idx) 249 { 250 struct ifnet *ifp; 251 252 IFNET_RLOCK_NOSLEEP(); 253 ifp = ifnet_byindex_locked(idx); 254 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 255 IFNET_RUNLOCK_NOSLEEP(); 256 return (NULL); 257 } 258 if_ref(ifp); 259 IFNET_RUNLOCK_NOSLEEP(); 260 return (ifp); 261 } 262 263 /* 264 * Allocate an ifindex array entry; return 0 on success or an error on 265 * failure. 266 */ 267 static int 268 ifindex_alloc_locked(u_short *idxp) 269 { 270 u_short idx; 271 272 IFNET_WLOCK_ASSERT(); 273 274 retry: 275 /* 276 * Try to find an empty slot below V_if_index. If we fail, take the 277 * next slot. 278 */ 279 for (idx = 1; idx <= V_if_index; idx++) { 280 if (V_ifindex_table[idx].ife_ifnet == NULL) 281 break; 282 } 283 284 /* Catch if_index overflow. */ 285 if (idx < 1) 286 return (ENOSPC); 287 if (idx >= V_if_indexlim) { 288 if_grow(); 289 goto retry; 290 } 291 if (idx > V_if_index) 292 V_if_index = idx; 293 *idxp = idx; 294 return (0); 295 } 296 297 static void 298 ifindex_free_locked(u_short idx) 299 { 300 301 IFNET_WLOCK_ASSERT(); 302 303 V_ifindex_table[idx].ife_ifnet = NULL; 304 while (V_if_index > 0 && 305 V_ifindex_table[V_if_index].ife_ifnet == NULL) 306 V_if_index--; 307 } 308 309 static void 310 ifindex_free(u_short idx) 311 { 312 313 IFNET_WLOCK(); 314 ifindex_free_locked(idx); 315 IFNET_WUNLOCK(); 316 } 317 318 static void 319 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 320 { 321 322 IFNET_WLOCK_ASSERT(); 323 324 V_ifindex_table[idx].ife_ifnet = ifp; 325 } 326 327 static void 328 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 329 { 330 331 IFNET_WLOCK(); 332 ifnet_setbyindex_locked(idx, ifp); 333 IFNET_WUNLOCK(); 334 } 335 336 struct ifaddr * 337 ifaddr_byindex(u_short idx) 338 { 339 struct ifaddr *ifa; 340 341 IFNET_RLOCK_NOSLEEP(); 342 ifa = ifnet_byindex_locked(idx)->if_addr; 343 if (ifa != NULL) 344 ifa_ref(ifa); 345 IFNET_RUNLOCK_NOSLEEP(); 346 return (ifa); 347 } 348 349 /* 350 * Network interface utility routines. 351 * 352 * Routines with ifa_ifwith* names take sockaddr *'s as 353 * parameters. 354 */ 355 356 static void 357 vnet_if_init(const void *unused __unused) 358 { 359 360 TAILQ_INIT(&V_ifnet); 361 TAILQ_INIT(&V_ifg_head); 362 IFNET_WLOCK(); 363 if_grow(); /* create initial table */ 364 IFNET_WUNLOCK(); 365 vnet_if_clone_init(); 366 } 367 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 368 NULL); 369 370 /* ARGSUSED*/ 371 static void 372 if_init(void *dummy __unused) 373 { 374 375 IFNET_LOCK_INIT(); 376 if_clone_init(); 377 } 378 SYSINIT(interfaces, SI_SUB_INIT_IF, SI_ORDER_FIRST, if_init, NULL); 379 380 381 #ifdef VIMAGE 382 static void 383 vnet_if_uninit(const void *unused __unused) 384 { 385 386 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 387 "not empty", __func__, __LINE__, &V_ifnet)); 388 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 389 "not empty", __func__, __LINE__, &V_ifg_head)); 390 391 free((caddr_t)V_ifindex_table, M_IFNET); 392 } 393 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 394 vnet_if_uninit, NULL); 395 #endif 396 397 static void 398 if_grow(void) 399 { 400 int oldlim; 401 u_int n; 402 struct ifindex_entry *e; 403 404 IFNET_WLOCK_ASSERT(); 405 oldlim = V_if_indexlim; 406 IFNET_WUNLOCK(); 407 n = (oldlim << 1) * sizeof(*e); 408 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 409 IFNET_WLOCK(); 410 if (V_if_indexlim != oldlim) { 411 free(e, M_IFNET); 412 return; 413 } 414 if (V_ifindex_table != NULL) { 415 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 416 free((caddr_t)V_ifindex_table, M_IFNET); 417 } 418 V_if_indexlim <<= 1; 419 V_ifindex_table = e; 420 } 421 422 /* 423 * Allocate a struct ifnet and an index for an interface. A layer 2 424 * common structure will also be allocated if an allocation routine is 425 * registered for the passed type. 426 */ 427 struct ifnet * 428 if_alloc(u_char type) 429 { 430 struct ifnet *ifp; 431 u_short idx; 432 433 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 434 IFNET_WLOCK(); 435 if (ifindex_alloc_locked(&idx) != 0) { 436 IFNET_WUNLOCK(); 437 free(ifp, M_IFNET); 438 return (NULL); 439 } 440 ifnet_setbyindex_locked(idx, IFNET_HOLD); 441 IFNET_WUNLOCK(); 442 ifp->if_index = idx; 443 ifp->if_type = type; 444 ifp->if_alloctype = type; 445 if (if_com_alloc[type] != NULL) { 446 ifp->if_l2com = if_com_alloc[type](type, ifp); 447 if (ifp->if_l2com == NULL) { 448 free(ifp, M_IFNET); 449 ifindex_free(idx); 450 return (NULL); 451 } 452 } 453 454 IF_ADDR_LOCK_INIT(ifp); 455 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 456 ifp->if_afdata_initialized = 0; 457 IF_AFDATA_LOCK_INIT(ifp); 458 TAILQ_INIT(&ifp->if_addrhead); 459 TAILQ_INIT(&ifp->if_multiaddrs); 460 TAILQ_INIT(&ifp->if_groups); 461 #ifdef MAC 462 mac_ifnet_init(ifp); 463 #endif 464 ifq_init(&ifp->if_snd, ifp); 465 466 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 467 ifnet_setbyindex(ifp->if_index, ifp); 468 return (ifp); 469 } 470 471 /* 472 * Do the actual work of freeing a struct ifnet, and layer 2 common 473 * structure. This call is made when the last reference to an 474 * interface is released. 475 */ 476 static void 477 if_free_internal(struct ifnet *ifp) 478 { 479 480 KASSERT((ifp->if_flags & IFF_DYING), 481 ("if_free_internal: interface not dying")); 482 483 if (if_com_free[ifp->if_alloctype] != NULL) 484 if_com_free[ifp->if_alloctype](ifp->if_l2com, 485 ifp->if_alloctype); 486 487 #ifdef MAC 488 mac_ifnet_destroy(ifp); 489 #endif /* MAC */ 490 if (ifp->if_description != NULL) 491 free(ifp->if_description, M_IFDESCR); 492 IF_AFDATA_DESTROY(ifp); 493 IF_ADDR_LOCK_DESTROY(ifp); 494 ifq_delete(&ifp->if_snd); 495 free(ifp, M_IFNET); 496 } 497 498 /* 499 * Deregister an interface and free the associated storage. 500 */ 501 void 502 if_free(struct ifnet *ifp) 503 { 504 505 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 506 507 IFNET_WLOCK(); 508 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 509 ("%s: freeing unallocated ifnet", ifp->if_xname)); 510 511 ifindex_free_locked(ifp->if_index); 512 IFNET_WUNLOCK(); 513 514 if (!refcount_release(&ifp->if_refcount)) 515 return; 516 if_free_internal(ifp); 517 } 518 519 /* 520 * Interfaces to keep an ifnet type-stable despite the possibility of the 521 * driver calling if_free(). If there are additional references, we defer 522 * freeing the underlying data structure. 523 */ 524 void 525 if_ref(struct ifnet *ifp) 526 { 527 528 /* We don't assert the ifnet list lock here, but arguably should. */ 529 refcount_acquire(&ifp->if_refcount); 530 } 531 532 void 533 if_rele(struct ifnet *ifp) 534 { 535 536 if (!refcount_release(&ifp->if_refcount)) 537 return; 538 if_free_internal(ifp); 539 } 540 541 void 542 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 543 { 544 545 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 546 547 if (ifq->ifq_maxlen == 0) 548 ifq->ifq_maxlen = ifqmaxlen; 549 550 ifq->altq_type = 0; 551 ifq->altq_disc = NULL; 552 ifq->altq_flags &= ALTQF_CANTCHANGE; 553 ifq->altq_tbr = NULL; 554 ifq->altq_ifp = ifp; 555 } 556 557 void 558 ifq_delete(struct ifaltq *ifq) 559 { 560 mtx_destroy(&ifq->ifq_mtx); 561 } 562 563 /* 564 * Perform generic interface initalization tasks and attach the interface 565 * to the list of "active" interfaces. If vmove flag is set on entry 566 * to if_attach_internal(), perform only a limited subset of initialization 567 * tasks, given that we are moving from one vnet to another an ifnet which 568 * has already been fully initialized. 569 * 570 * XXX: 571 * - The decision to return void and thus require this function to 572 * succeed is questionable. 573 * - We should probably do more sanity checking. For instance we don't 574 * do anything to insure if_xname is unique or non-empty. 575 */ 576 void 577 if_attach(struct ifnet *ifp) 578 { 579 580 if_attach_internal(ifp, 0); 581 } 582 583 static void 584 if_attach_internal(struct ifnet *ifp, int vmove) 585 { 586 unsigned socksize, ifasize; 587 int namelen, masklen; 588 struct sockaddr_dl *sdl; 589 struct ifaddr *ifa; 590 591 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 592 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 593 ifp->if_xname); 594 595 #ifdef VIMAGE 596 ifp->if_vnet = curvnet; 597 if (ifp->if_home_vnet == NULL) 598 ifp->if_home_vnet = curvnet; 599 #endif 600 601 if_addgroup(ifp, IFG_ALL); 602 603 getmicrotime(&ifp->if_lastchange); 604 ifp->if_data.ifi_epoch = time_uptime; 605 ifp->if_data.ifi_datalen = sizeof(struct if_data); 606 607 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 608 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 609 ("transmit and qflush must both either be set or both be NULL")); 610 if (ifp->if_transmit == NULL) { 611 ifp->if_transmit = if_transmit; 612 ifp->if_qflush = if_qflush; 613 } 614 615 if (!vmove) { 616 #ifdef MAC 617 mac_ifnet_create(ifp); 618 #endif 619 620 /* 621 * Create a Link Level name for this device. 622 */ 623 namelen = strlen(ifp->if_xname); 624 /* 625 * Always save enough space for any possiable name so we 626 * can do a rename in place later. 627 */ 628 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 629 socksize = masklen + ifp->if_addrlen; 630 if (socksize < sizeof(*sdl)) 631 socksize = sizeof(*sdl); 632 socksize = roundup2(socksize, sizeof(long)); 633 ifasize = sizeof(*ifa) + 2 * socksize; 634 ifa = malloc(ifasize, M_IFADDR, M_WAITOK | M_ZERO); 635 ifa_init(ifa); 636 sdl = (struct sockaddr_dl *)(ifa + 1); 637 sdl->sdl_len = socksize; 638 sdl->sdl_family = AF_LINK; 639 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 640 sdl->sdl_nlen = namelen; 641 sdl->sdl_index = ifp->if_index; 642 sdl->sdl_type = ifp->if_type; 643 ifp->if_addr = ifa; 644 ifa->ifa_ifp = ifp; 645 ifa->ifa_rtrequest = link_rtrequest; 646 ifa->ifa_addr = (struct sockaddr *)sdl; 647 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 648 ifa->ifa_netmask = (struct sockaddr *)sdl; 649 sdl->sdl_len = masklen; 650 while (namelen != 0) 651 sdl->sdl_data[--namelen] = 0xff; 652 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 653 /* Reliably crash if used uninitialized. */ 654 ifp->if_broadcastaddr = NULL; 655 } 656 #ifdef VIMAGE 657 else { 658 /* 659 * Update the interface index in the link layer address 660 * of the interface. 661 */ 662 for (ifa = ifp->if_addr; ifa != NULL; 663 ifa = TAILQ_NEXT(ifa, ifa_link)) { 664 if (ifa->ifa_addr->sa_family == AF_LINK) { 665 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 666 sdl->sdl_index = ifp->if_index; 667 } 668 } 669 } 670 #endif 671 672 IFNET_WLOCK(); 673 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 674 #ifdef VIMAGE 675 curvnet->vnet_ifcnt++; 676 #endif 677 IFNET_WUNLOCK(); 678 679 if (domain_init_status >= 2) 680 if_attachdomain1(ifp); 681 682 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 683 if (IS_DEFAULT_VNET(curvnet)) 684 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 685 686 /* Announce the interface. */ 687 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 688 } 689 690 static void 691 if_attachdomain(void *dummy) 692 { 693 struct ifnet *ifp; 694 695 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 696 if_attachdomain1(ifp); 697 } 698 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 699 if_attachdomain, NULL); 700 701 static void 702 if_attachdomain1(struct ifnet *ifp) 703 { 704 struct domain *dp; 705 706 /* 707 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 708 * cannot lock ifp->if_afdata initialization, entirely. 709 */ 710 if (IF_AFDATA_TRYLOCK(ifp) == 0) 711 return; 712 if (ifp->if_afdata_initialized >= domain_init_status) { 713 IF_AFDATA_UNLOCK(ifp); 714 log(LOG_WARNING, "%s called more than once on %s\n", 715 __func__, ifp->if_xname); 716 return; 717 } 718 ifp->if_afdata_initialized = domain_init_status; 719 IF_AFDATA_UNLOCK(ifp); 720 721 /* address family dependent data region */ 722 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 723 for (dp = domains; dp; dp = dp->dom_next) { 724 if (dp->dom_ifattach) 725 ifp->if_afdata[dp->dom_family] = 726 (*dp->dom_ifattach)(ifp); 727 } 728 } 729 730 /* 731 * Remove any unicast or broadcast network addresses from an interface. 732 */ 733 void 734 if_purgeaddrs(struct ifnet *ifp) 735 { 736 struct ifaddr *ifa, *next; 737 738 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 739 if (ifa->ifa_addr->sa_family == AF_LINK) 740 continue; 741 #ifdef INET 742 /* XXX: Ugly!! ad hoc just for INET */ 743 if (ifa->ifa_addr->sa_family == AF_INET) { 744 struct ifaliasreq ifr; 745 746 bzero(&ifr, sizeof(ifr)); 747 ifr.ifra_addr = *ifa->ifa_addr; 748 if (ifa->ifa_dstaddr) 749 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 750 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 751 NULL) == 0) 752 continue; 753 } 754 #endif /* INET */ 755 #ifdef INET6 756 if (ifa->ifa_addr->sa_family == AF_INET6) { 757 in6_purgeaddr(ifa); 758 /* ifp_addrhead is already updated */ 759 continue; 760 } 761 #endif /* INET6 */ 762 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 763 ifa_free(ifa); 764 } 765 } 766 767 /* 768 * Remove any multicast network addresses from an interface when an ifnet 769 * is going away. 770 */ 771 static void 772 if_purgemaddrs(struct ifnet *ifp) 773 { 774 struct ifmultiaddr *ifma; 775 struct ifmultiaddr *next; 776 777 IF_ADDR_WLOCK(ifp); 778 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 779 if_delmulti_locked(ifp, ifma, 1); 780 IF_ADDR_WUNLOCK(ifp); 781 } 782 783 /* 784 * Detach an interface, removing it from the list of "active" interfaces. 785 * If vmove flag is set on entry to if_detach_internal(), perform only a 786 * limited subset of cleanup tasks, given that we are moving an ifnet from 787 * one vnet to another, where it must be fully operational. 788 * 789 * XXXRW: There are some significant questions about event ordering, and 790 * how to prevent things from starting to use the interface during detach. 791 */ 792 void 793 if_detach(struct ifnet *ifp) 794 { 795 796 if_detach_internal(ifp, 0); 797 } 798 799 static void 800 if_detach_internal(struct ifnet *ifp, int vmove) 801 { 802 struct ifaddr *ifa; 803 struct radix_node_head *rnh; 804 int i, j; 805 struct domain *dp; 806 struct ifnet *iter; 807 int found = 0; 808 809 IFNET_WLOCK(); 810 TAILQ_FOREACH(iter, &V_ifnet, if_link) 811 if (iter == ifp) { 812 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 813 found = 1; 814 break; 815 } 816 #ifdef VIMAGE 817 if (found) 818 curvnet->vnet_ifcnt--; 819 #endif 820 IFNET_WUNLOCK(); 821 if (!found) { 822 if (vmove) 823 panic("%s: ifp=%p not on the ifnet tailq %p", 824 __func__, ifp, &V_ifnet); 825 else 826 return; /* XXX this should panic as well? */ 827 } 828 829 /* 830 * Remove/wait for pending events. 831 */ 832 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 833 834 /* 835 * Remove routes and flush queues. 836 */ 837 if_down(ifp); 838 #ifdef ALTQ 839 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 840 altq_disable(&ifp->if_snd); 841 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 842 altq_detach(&ifp->if_snd); 843 #endif 844 845 if_purgeaddrs(ifp); 846 847 #ifdef INET 848 in_ifdetach(ifp); 849 #endif 850 851 #ifdef INET6 852 /* 853 * Remove all IPv6 kernel structs related to ifp. This should be done 854 * before removing routing entries below, since IPv6 interface direct 855 * routes are expected to be removed by the IPv6-specific kernel API. 856 * Otherwise, the kernel will detect some inconsistency and bark it. 857 */ 858 in6_ifdetach(ifp); 859 #endif 860 if_purgemaddrs(ifp); 861 862 if (!vmove) { 863 /* 864 * Prevent further calls into the device driver via ifnet. 865 */ 866 if_dead(ifp); 867 868 /* 869 * Remove link ifaddr pointer and maybe decrement if_index. 870 * Clean up all addresses. 871 */ 872 ifp->if_addr = NULL; 873 874 /* We can now free link ifaddr. */ 875 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 876 ifa = TAILQ_FIRST(&ifp->if_addrhead); 877 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 878 ifa_free(ifa); 879 } 880 } 881 882 /* 883 * Delete all remaining routes using this interface 884 * Unfortuneatly the only way to do this is to slog through 885 * the entire routing table looking for routes which point 886 * to this interface...oh well... 887 */ 888 for (i = 1; i <= AF_MAX; i++) { 889 for (j = 0; j < rt_numfibs; j++) { 890 rnh = rt_tables_get_rnh(j, i); 891 if (rnh == NULL) 892 continue; 893 RADIX_NODE_HEAD_LOCK(rnh); 894 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 895 RADIX_NODE_HEAD_UNLOCK(rnh); 896 } 897 } 898 899 /* Announce that the interface is gone. */ 900 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 901 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 902 if (IS_DEFAULT_VNET(curvnet)) 903 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 904 if_delgroups(ifp); 905 906 /* 907 * We cannot hold the lock over dom_ifdetach calls as they might 908 * sleep, for example trying to drain a callout, thus open up the 909 * theoretical race with re-attaching. 910 */ 911 IF_AFDATA_LOCK(ifp); 912 i = ifp->if_afdata_initialized; 913 ifp->if_afdata_initialized = 0; 914 IF_AFDATA_UNLOCK(ifp); 915 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 916 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 917 (*dp->dom_ifdetach)(ifp, 918 ifp->if_afdata[dp->dom_family]); 919 } 920 } 921 922 #ifdef VIMAGE 923 /* 924 * if_vmove() performs a limited version of if_detach() in current 925 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 926 * An attempt is made to shrink if_index in current vnet, find an 927 * unused if_index in target vnet and calls if_grow() if necessary, 928 * and finally find an unused if_xname for the target vnet. 929 */ 930 void 931 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 932 { 933 u_short idx; 934 935 /* 936 * Detach from current vnet, but preserve LLADDR info, do not 937 * mark as dead etc. so that the ifnet can be reattached later. 938 */ 939 if_detach_internal(ifp, 1); 940 941 /* 942 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 943 * the if_index for that vnet if possible. 944 * 945 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 946 * or we'd lock on one vnet and unlock on another. 947 */ 948 IFNET_WLOCK(); 949 ifindex_free_locked(ifp->if_index); 950 IFNET_WUNLOCK(); 951 952 /* 953 * Perform interface-specific reassignment tasks, if provided by 954 * the driver. 955 */ 956 if (ifp->if_reassign != NULL) 957 ifp->if_reassign(ifp, new_vnet, NULL); 958 959 /* 960 * Switch to the context of the target vnet. 961 */ 962 CURVNET_SET_QUIET(new_vnet); 963 964 IFNET_WLOCK(); 965 if (ifindex_alloc_locked(&idx) != 0) { 966 IFNET_WUNLOCK(); 967 panic("if_index overflow"); 968 } 969 ifp->if_index = idx; 970 ifnet_setbyindex_locked(ifp->if_index, ifp); 971 IFNET_WUNLOCK(); 972 973 if_attach_internal(ifp, 1); 974 975 CURVNET_RESTORE(); 976 } 977 978 /* 979 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 980 */ 981 static int 982 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 983 { 984 struct prison *pr; 985 struct ifnet *difp; 986 987 /* Try to find the prison within our visibility. */ 988 sx_slock(&allprison_lock); 989 pr = prison_find_child(td->td_ucred->cr_prison, jid); 990 sx_sunlock(&allprison_lock); 991 if (pr == NULL) 992 return (ENXIO); 993 prison_hold_locked(pr); 994 mtx_unlock(&pr->pr_mtx); 995 996 /* Do not try to move the iface from and to the same prison. */ 997 if (pr->pr_vnet == ifp->if_vnet) { 998 prison_free(pr); 999 return (EEXIST); 1000 } 1001 1002 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1003 /* XXX Lock interfaces to avoid races. */ 1004 CURVNET_SET_QUIET(pr->pr_vnet); 1005 difp = ifunit(ifname); 1006 CURVNET_RESTORE(); 1007 if (difp != NULL) { 1008 prison_free(pr); 1009 return (EEXIST); 1010 } 1011 1012 /* Move the interface into the child jail/vnet. */ 1013 if_vmove(ifp, pr->pr_vnet); 1014 1015 /* Report the new if_xname back to the userland. */ 1016 sprintf(ifname, "%s", ifp->if_xname); 1017 1018 prison_free(pr); 1019 return (0); 1020 } 1021 1022 static int 1023 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1024 { 1025 struct prison *pr; 1026 struct vnet *vnet_dst; 1027 struct ifnet *ifp; 1028 1029 /* Try to find the prison within our visibility. */ 1030 sx_slock(&allprison_lock); 1031 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1032 sx_sunlock(&allprison_lock); 1033 if (pr == NULL) 1034 return (ENXIO); 1035 prison_hold_locked(pr); 1036 mtx_unlock(&pr->pr_mtx); 1037 1038 /* Make sure the named iface exists in the source prison/vnet. */ 1039 CURVNET_SET(pr->pr_vnet); 1040 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1041 if (ifp == NULL) { 1042 CURVNET_RESTORE(); 1043 prison_free(pr); 1044 return (ENXIO); 1045 } 1046 1047 /* Do not try to move the iface from and to the same prison. */ 1048 vnet_dst = TD_TO_VNET(td); 1049 if (vnet_dst == ifp->if_vnet) { 1050 CURVNET_RESTORE(); 1051 prison_free(pr); 1052 return (EEXIST); 1053 } 1054 1055 /* Get interface back from child jail/vnet. */ 1056 if_vmove(ifp, vnet_dst); 1057 CURVNET_RESTORE(); 1058 1059 /* Report the new if_xname back to the userland. */ 1060 sprintf(ifname, "%s", ifp->if_xname); 1061 1062 prison_free(pr); 1063 return (0); 1064 } 1065 #endif /* VIMAGE */ 1066 1067 /* 1068 * Add a group to an interface 1069 */ 1070 int 1071 if_addgroup(struct ifnet *ifp, const char *groupname) 1072 { 1073 struct ifg_list *ifgl; 1074 struct ifg_group *ifg = NULL; 1075 struct ifg_member *ifgm; 1076 int new = 0; 1077 1078 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1079 groupname[strlen(groupname) - 1] <= '9') 1080 return (EINVAL); 1081 1082 IFNET_WLOCK(); 1083 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1084 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1085 IFNET_WUNLOCK(); 1086 return (EEXIST); 1087 } 1088 1089 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1090 M_NOWAIT)) == NULL) { 1091 IFNET_WUNLOCK(); 1092 return (ENOMEM); 1093 } 1094 1095 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1096 M_TEMP, M_NOWAIT)) == NULL) { 1097 free(ifgl, M_TEMP); 1098 IFNET_WUNLOCK(); 1099 return (ENOMEM); 1100 } 1101 1102 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1103 if (!strcmp(ifg->ifg_group, groupname)) 1104 break; 1105 1106 if (ifg == NULL) { 1107 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1108 M_TEMP, M_NOWAIT)) == NULL) { 1109 free(ifgl, M_TEMP); 1110 free(ifgm, M_TEMP); 1111 IFNET_WUNLOCK(); 1112 return (ENOMEM); 1113 } 1114 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1115 ifg->ifg_refcnt = 0; 1116 TAILQ_INIT(&ifg->ifg_members); 1117 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1118 new = 1; 1119 } 1120 1121 ifg->ifg_refcnt++; 1122 ifgl->ifgl_group = ifg; 1123 ifgm->ifgm_ifp = ifp; 1124 1125 IF_ADDR_WLOCK(ifp); 1126 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1127 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1128 IF_ADDR_WUNLOCK(ifp); 1129 1130 IFNET_WUNLOCK(); 1131 1132 if (new) 1133 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1134 EVENTHANDLER_INVOKE(group_change_event, groupname); 1135 1136 return (0); 1137 } 1138 1139 /* 1140 * Remove a group from an interface 1141 */ 1142 int 1143 if_delgroup(struct ifnet *ifp, const char *groupname) 1144 { 1145 struct ifg_list *ifgl; 1146 struct ifg_member *ifgm; 1147 1148 IFNET_WLOCK(); 1149 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1150 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1151 break; 1152 if (ifgl == NULL) { 1153 IFNET_WUNLOCK(); 1154 return (ENOENT); 1155 } 1156 1157 IF_ADDR_WLOCK(ifp); 1158 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1159 IF_ADDR_WUNLOCK(ifp); 1160 1161 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1162 if (ifgm->ifgm_ifp == ifp) 1163 break; 1164 1165 if (ifgm != NULL) { 1166 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1167 free(ifgm, M_TEMP); 1168 } 1169 1170 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1171 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1172 IFNET_WUNLOCK(); 1173 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1174 free(ifgl->ifgl_group, M_TEMP); 1175 } else 1176 IFNET_WUNLOCK(); 1177 1178 free(ifgl, M_TEMP); 1179 1180 EVENTHANDLER_INVOKE(group_change_event, groupname); 1181 1182 return (0); 1183 } 1184 1185 /* 1186 * Remove an interface from all groups 1187 */ 1188 static void 1189 if_delgroups(struct ifnet *ifp) 1190 { 1191 struct ifg_list *ifgl; 1192 struct ifg_member *ifgm; 1193 char groupname[IFNAMSIZ]; 1194 1195 IFNET_WLOCK(); 1196 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1197 ifgl = TAILQ_FIRST(&ifp->if_groups); 1198 1199 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1200 1201 IF_ADDR_WLOCK(ifp); 1202 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1203 IF_ADDR_WUNLOCK(ifp); 1204 1205 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1206 if (ifgm->ifgm_ifp == ifp) 1207 break; 1208 1209 if (ifgm != NULL) { 1210 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1211 ifgm_next); 1212 free(ifgm, M_TEMP); 1213 } 1214 1215 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1216 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1217 IFNET_WUNLOCK(); 1218 EVENTHANDLER_INVOKE(group_detach_event, 1219 ifgl->ifgl_group); 1220 free(ifgl->ifgl_group, M_TEMP); 1221 } else 1222 IFNET_WUNLOCK(); 1223 1224 free(ifgl, M_TEMP); 1225 1226 EVENTHANDLER_INVOKE(group_change_event, groupname); 1227 1228 IFNET_WLOCK(); 1229 } 1230 IFNET_WUNLOCK(); 1231 } 1232 1233 /* 1234 * Stores all groups from an interface in memory pointed 1235 * to by data 1236 */ 1237 static int 1238 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1239 { 1240 int len, error; 1241 struct ifg_list *ifgl; 1242 struct ifg_req ifgrq, *ifgp; 1243 struct ifgroupreq *ifgr = data; 1244 1245 if (ifgr->ifgr_len == 0) { 1246 IF_ADDR_RLOCK(ifp); 1247 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1248 ifgr->ifgr_len += sizeof(struct ifg_req); 1249 IF_ADDR_RUNLOCK(ifp); 1250 return (0); 1251 } 1252 1253 len = ifgr->ifgr_len; 1254 ifgp = ifgr->ifgr_groups; 1255 /* XXX: wire */ 1256 IF_ADDR_RLOCK(ifp); 1257 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1258 if (len < sizeof(ifgrq)) { 1259 IF_ADDR_RUNLOCK(ifp); 1260 return (EINVAL); 1261 } 1262 bzero(&ifgrq, sizeof ifgrq); 1263 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1264 sizeof(ifgrq.ifgrq_group)); 1265 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1266 IF_ADDR_RUNLOCK(ifp); 1267 return (error); 1268 } 1269 len -= sizeof(ifgrq); 1270 ifgp++; 1271 } 1272 IF_ADDR_RUNLOCK(ifp); 1273 1274 return (0); 1275 } 1276 1277 /* 1278 * Stores all members of a group in memory pointed to by data 1279 */ 1280 static int 1281 if_getgroupmembers(struct ifgroupreq *data) 1282 { 1283 struct ifgroupreq *ifgr = data; 1284 struct ifg_group *ifg; 1285 struct ifg_member *ifgm; 1286 struct ifg_req ifgrq, *ifgp; 1287 int len, error; 1288 1289 IFNET_RLOCK(); 1290 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1291 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1292 break; 1293 if (ifg == NULL) { 1294 IFNET_RUNLOCK(); 1295 return (ENOENT); 1296 } 1297 1298 if (ifgr->ifgr_len == 0) { 1299 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1300 ifgr->ifgr_len += sizeof(ifgrq); 1301 IFNET_RUNLOCK(); 1302 return (0); 1303 } 1304 1305 len = ifgr->ifgr_len; 1306 ifgp = ifgr->ifgr_groups; 1307 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1308 if (len < sizeof(ifgrq)) { 1309 IFNET_RUNLOCK(); 1310 return (EINVAL); 1311 } 1312 bzero(&ifgrq, sizeof ifgrq); 1313 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1314 sizeof(ifgrq.ifgrq_member)); 1315 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1316 IFNET_RUNLOCK(); 1317 return (error); 1318 } 1319 len -= sizeof(ifgrq); 1320 ifgp++; 1321 } 1322 IFNET_RUNLOCK(); 1323 1324 return (0); 1325 } 1326 1327 /* 1328 * Delete Routes for a Network Interface 1329 * 1330 * Called for each routing entry via the rnh->rnh_walktree() call above 1331 * to delete all route entries referencing a detaching network interface. 1332 * 1333 * Arguments: 1334 * rn pointer to node in the routing table 1335 * arg argument passed to rnh->rnh_walktree() - detaching interface 1336 * 1337 * Returns: 1338 * 0 successful 1339 * errno failed - reason indicated 1340 * 1341 */ 1342 static int 1343 if_rtdel(struct radix_node *rn, void *arg) 1344 { 1345 struct rtentry *rt = (struct rtentry *)rn; 1346 struct ifnet *ifp = arg; 1347 int err; 1348 1349 if (rt->rt_ifp == ifp) { 1350 1351 /* 1352 * Protect (sorta) against walktree recursion problems 1353 * with cloned routes 1354 */ 1355 if ((rt->rt_flags & RTF_UP) == 0) 1356 return (0); 1357 1358 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1359 rt_mask(rt), rt->rt_flags|RTF_RNH_LOCKED, 1360 (struct rtentry **) NULL, rt->rt_fibnum); 1361 if (err) { 1362 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1363 } 1364 } 1365 1366 return (0); 1367 } 1368 1369 /* 1370 * Wrapper functions for struct ifnet address list locking macros. These are 1371 * used by kernel modules to avoid encoding programming interface or binary 1372 * interface assumptions that may be violated when kernel-internal locking 1373 * approaches change. 1374 */ 1375 void 1376 if_addr_rlock(struct ifnet *ifp) 1377 { 1378 1379 IF_ADDR_RLOCK(ifp); 1380 } 1381 1382 void 1383 if_addr_runlock(struct ifnet *ifp) 1384 { 1385 1386 IF_ADDR_RUNLOCK(ifp); 1387 } 1388 1389 void 1390 if_maddr_rlock(struct ifnet *ifp) 1391 { 1392 1393 IF_ADDR_RLOCK(ifp); 1394 } 1395 1396 void 1397 if_maddr_runlock(struct ifnet *ifp) 1398 { 1399 1400 IF_ADDR_RUNLOCK(ifp); 1401 } 1402 1403 /* 1404 * Initialization, destruction and refcounting functions for ifaddrs. 1405 */ 1406 void 1407 ifa_init(struct ifaddr *ifa) 1408 { 1409 1410 mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF); 1411 refcount_init(&ifa->ifa_refcnt, 1); 1412 ifa->if_data.ifi_datalen = sizeof(ifa->if_data); 1413 } 1414 1415 void 1416 ifa_ref(struct ifaddr *ifa) 1417 { 1418 1419 refcount_acquire(&ifa->ifa_refcnt); 1420 } 1421 1422 void 1423 ifa_free(struct ifaddr *ifa) 1424 { 1425 1426 if (refcount_release(&ifa->ifa_refcnt)) { 1427 mtx_destroy(&ifa->ifa_mtx); 1428 free(ifa, M_IFADDR); 1429 } 1430 } 1431 1432 int 1433 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1434 { 1435 int error = 0; 1436 struct rtentry *rt = NULL; 1437 struct rt_addrinfo info; 1438 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1439 1440 bzero(&info, sizeof(info)); 1441 info.rti_ifp = V_loif; 1442 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1443 info.rti_info[RTAX_DST] = ia; 1444 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1445 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1446 1447 if (error == 0 && rt != NULL) { 1448 RT_LOCK(rt); 1449 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1450 ifa->ifa_ifp->if_type; 1451 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1452 ifa->ifa_ifp->if_index; 1453 RT_REMREF(rt); 1454 RT_UNLOCK(rt); 1455 } else if (error != 0) 1456 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1457 1458 return (error); 1459 } 1460 1461 int 1462 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1463 { 1464 int error = 0; 1465 struct rt_addrinfo info; 1466 struct sockaddr_dl null_sdl; 1467 1468 bzero(&null_sdl, sizeof(null_sdl)); 1469 null_sdl.sdl_len = sizeof(null_sdl); 1470 null_sdl.sdl_family = AF_LINK; 1471 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1472 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1473 bzero(&info, sizeof(info)); 1474 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1475 info.rti_info[RTAX_DST] = ia; 1476 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1477 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1478 1479 if (error != 0) 1480 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1481 1482 return (error); 1483 } 1484 1485 /* 1486 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1487 * structs used to represent other address families, it is necessary 1488 * to perform a different comparison. 1489 */ 1490 1491 #define sa_equal(a1, a2) \ 1492 (bcmp((a1), (a2), ((a1))->sa_len) == 0) 1493 1494 #define sa_dl_equal(a1, a2) \ 1495 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1496 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1497 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1498 LLADDR((struct sockaddr_dl *)(a2)), \ 1499 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1500 1501 /* 1502 * Locate an interface based on a complete address. 1503 */ 1504 /*ARGSUSED*/ 1505 static struct ifaddr * 1506 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1507 { 1508 struct ifnet *ifp; 1509 struct ifaddr *ifa; 1510 1511 IFNET_RLOCK_NOSLEEP(); 1512 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1513 IF_ADDR_RLOCK(ifp); 1514 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1515 if (ifa->ifa_addr->sa_family != addr->sa_family) 1516 continue; 1517 if (sa_equal(addr, ifa->ifa_addr)) { 1518 if (getref) 1519 ifa_ref(ifa); 1520 IF_ADDR_RUNLOCK(ifp); 1521 goto done; 1522 } 1523 /* IP6 doesn't have broadcast */ 1524 if ((ifp->if_flags & IFF_BROADCAST) && 1525 ifa->ifa_broadaddr && 1526 ifa->ifa_broadaddr->sa_len != 0 && 1527 sa_equal(ifa->ifa_broadaddr, addr)) { 1528 if (getref) 1529 ifa_ref(ifa); 1530 IF_ADDR_RUNLOCK(ifp); 1531 goto done; 1532 } 1533 } 1534 IF_ADDR_RUNLOCK(ifp); 1535 } 1536 ifa = NULL; 1537 done: 1538 IFNET_RUNLOCK_NOSLEEP(); 1539 return (ifa); 1540 } 1541 1542 struct ifaddr * 1543 ifa_ifwithaddr(struct sockaddr *addr) 1544 { 1545 1546 return (ifa_ifwithaddr_internal(addr, 1)); 1547 } 1548 1549 int 1550 ifa_ifwithaddr_check(struct sockaddr *addr) 1551 { 1552 1553 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1554 } 1555 1556 /* 1557 * Locate an interface based on the broadcast address. 1558 */ 1559 /* ARGSUSED */ 1560 struct ifaddr * 1561 ifa_ifwithbroadaddr(struct sockaddr *addr) 1562 { 1563 struct ifnet *ifp; 1564 struct ifaddr *ifa; 1565 1566 IFNET_RLOCK_NOSLEEP(); 1567 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1568 IF_ADDR_RLOCK(ifp); 1569 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1570 if (ifa->ifa_addr->sa_family != addr->sa_family) 1571 continue; 1572 if ((ifp->if_flags & IFF_BROADCAST) && 1573 ifa->ifa_broadaddr && 1574 ifa->ifa_broadaddr->sa_len != 0 && 1575 sa_equal(ifa->ifa_broadaddr, addr)) { 1576 ifa_ref(ifa); 1577 IF_ADDR_RUNLOCK(ifp); 1578 goto done; 1579 } 1580 } 1581 IF_ADDR_RUNLOCK(ifp); 1582 } 1583 ifa = NULL; 1584 done: 1585 IFNET_RUNLOCK_NOSLEEP(); 1586 return (ifa); 1587 } 1588 1589 /* 1590 * Locate the point to point interface with a given destination address. 1591 */ 1592 /*ARGSUSED*/ 1593 struct ifaddr * 1594 ifa_ifwithdstaddr(struct sockaddr *addr) 1595 { 1596 struct ifnet *ifp; 1597 struct ifaddr *ifa; 1598 1599 IFNET_RLOCK_NOSLEEP(); 1600 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1601 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1602 continue; 1603 IF_ADDR_RLOCK(ifp); 1604 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1605 if (ifa->ifa_addr->sa_family != addr->sa_family) 1606 continue; 1607 if (ifa->ifa_dstaddr != NULL && 1608 sa_equal(addr, ifa->ifa_dstaddr)) { 1609 ifa_ref(ifa); 1610 IF_ADDR_RUNLOCK(ifp); 1611 goto done; 1612 } 1613 } 1614 IF_ADDR_RUNLOCK(ifp); 1615 } 1616 ifa = NULL; 1617 done: 1618 IFNET_RUNLOCK_NOSLEEP(); 1619 return (ifa); 1620 } 1621 1622 /* 1623 * Find an interface on a specific network. If many, choice 1624 * is most specific found. 1625 */ 1626 struct ifaddr * 1627 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp) 1628 { 1629 struct ifnet *ifp; 1630 struct ifaddr *ifa; 1631 struct ifaddr *ifa_maybe = NULL; 1632 u_int af = addr->sa_family; 1633 char *addr_data = addr->sa_data, *cplim; 1634 1635 /* 1636 * AF_LINK addresses can be looked up directly by their index number, 1637 * so do that if we can. 1638 */ 1639 if (af == AF_LINK) { 1640 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1641 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1642 return (ifaddr_byindex(sdl->sdl_index)); 1643 } 1644 1645 /* 1646 * Scan though each interface, looking for ones that have addresses 1647 * in this address family. Maintain a reference on ifa_maybe once 1648 * we find one, as we release the IF_ADDR_RLOCK() that kept it stable 1649 * when we move onto the next interface. 1650 */ 1651 IFNET_RLOCK_NOSLEEP(); 1652 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1653 IF_ADDR_RLOCK(ifp); 1654 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1655 char *cp, *cp2, *cp3; 1656 1657 if (ifa->ifa_addr->sa_family != af) 1658 next: continue; 1659 if (af == AF_INET && 1660 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1661 /* 1662 * This is a bit broken as it doesn't 1663 * take into account that the remote end may 1664 * be a single node in the network we are 1665 * looking for. 1666 * The trouble is that we don't know the 1667 * netmask for the remote end. 1668 */ 1669 if (ifa->ifa_dstaddr != NULL && 1670 sa_equal(addr, ifa->ifa_dstaddr)) { 1671 ifa_ref(ifa); 1672 IF_ADDR_RUNLOCK(ifp); 1673 goto done; 1674 } 1675 } else { 1676 /* 1677 * if we have a special address handler, 1678 * then use it instead of the generic one. 1679 */ 1680 if (ifa->ifa_claim_addr) { 1681 if ((*ifa->ifa_claim_addr)(ifa, addr)) { 1682 ifa_ref(ifa); 1683 IF_ADDR_RUNLOCK(ifp); 1684 goto done; 1685 } 1686 continue; 1687 } 1688 1689 /* 1690 * Scan all the bits in the ifa's address. 1691 * If a bit dissagrees with what we are 1692 * looking for, mask it with the netmask 1693 * to see if it really matters. 1694 * (A byte at a time) 1695 */ 1696 if (ifa->ifa_netmask == 0) 1697 continue; 1698 cp = addr_data; 1699 cp2 = ifa->ifa_addr->sa_data; 1700 cp3 = ifa->ifa_netmask->sa_data; 1701 cplim = ifa->ifa_netmask->sa_len 1702 + (char *)ifa->ifa_netmask; 1703 while (cp3 < cplim) 1704 if ((*cp++ ^ *cp2++) & *cp3++) 1705 goto next; /* next address! */ 1706 /* 1707 * If the netmask of what we just found 1708 * is more specific than what we had before 1709 * (if we had one) then remember the new one 1710 * before continuing to search 1711 * for an even better one. 1712 */ 1713 if (ifa_maybe == NULL || 1714 rn_refines((caddr_t)ifa->ifa_netmask, 1715 (caddr_t)ifa_maybe->ifa_netmask)) { 1716 if (ifa_maybe != NULL) 1717 ifa_free(ifa_maybe); 1718 ifa_maybe = ifa; 1719 ifa_ref(ifa_maybe); 1720 } 1721 } 1722 } 1723 IF_ADDR_RUNLOCK(ifp); 1724 } 1725 ifa = ifa_maybe; 1726 ifa_maybe = NULL; 1727 done: 1728 IFNET_RUNLOCK_NOSLEEP(); 1729 if (ifa_maybe != NULL) 1730 ifa_free(ifa_maybe); 1731 return (ifa); 1732 } 1733 1734 /* 1735 * Find an interface address specific to an interface best matching 1736 * a given address. 1737 */ 1738 struct ifaddr * 1739 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1740 { 1741 struct ifaddr *ifa; 1742 char *cp, *cp2, *cp3; 1743 char *cplim; 1744 struct ifaddr *ifa_maybe = NULL; 1745 u_int af = addr->sa_family; 1746 1747 if (af >= AF_MAX) 1748 return (NULL); 1749 IF_ADDR_RLOCK(ifp); 1750 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1751 if (ifa->ifa_addr->sa_family != af) 1752 continue; 1753 if (ifa_maybe == NULL) 1754 ifa_maybe = ifa; 1755 if (ifa->ifa_netmask == 0) { 1756 if (sa_equal(addr, ifa->ifa_addr) || 1757 (ifa->ifa_dstaddr && 1758 sa_equal(addr, ifa->ifa_dstaddr))) 1759 goto done; 1760 continue; 1761 } 1762 if (ifp->if_flags & IFF_POINTOPOINT) { 1763 if (sa_equal(addr, ifa->ifa_dstaddr)) 1764 goto done; 1765 } else { 1766 cp = addr->sa_data; 1767 cp2 = ifa->ifa_addr->sa_data; 1768 cp3 = ifa->ifa_netmask->sa_data; 1769 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1770 for (; cp3 < cplim; cp3++) 1771 if ((*cp++ ^ *cp2++) & *cp3) 1772 break; 1773 if (cp3 == cplim) 1774 goto done; 1775 } 1776 } 1777 ifa = ifa_maybe; 1778 done: 1779 if (ifa != NULL) 1780 ifa_ref(ifa); 1781 IF_ADDR_RUNLOCK(ifp); 1782 return (ifa); 1783 } 1784 1785 #include <net/if_llatbl.h> 1786 1787 /* 1788 * Default action when installing a route with a Link Level gateway. 1789 * Lookup an appropriate real ifa to point to. 1790 * This should be moved to /sys/net/link.c eventually. 1791 */ 1792 static void 1793 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1794 { 1795 struct ifaddr *ifa, *oifa; 1796 struct sockaddr *dst; 1797 struct ifnet *ifp; 1798 1799 RT_LOCK_ASSERT(rt); 1800 1801 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 1802 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 1803 return; 1804 ifa = ifaof_ifpforaddr(dst, ifp); 1805 if (ifa) { 1806 oifa = rt->rt_ifa; 1807 rt->rt_ifa = ifa; 1808 ifa_free(oifa); 1809 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 1810 ifa->ifa_rtrequest(cmd, rt, info); 1811 } 1812 } 1813 1814 /* 1815 * Mark an interface down and notify protocols of 1816 * the transition. 1817 */ 1818 static void 1819 if_unroute(struct ifnet *ifp, int flag, int fam) 1820 { 1821 struct ifaddr *ifa; 1822 1823 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 1824 1825 ifp->if_flags &= ~flag; 1826 getmicrotime(&ifp->if_lastchange); 1827 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1828 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1829 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 1830 ifp->if_qflush(ifp); 1831 1832 if (ifp->if_carp) 1833 (*carp_linkstate_p)(ifp); 1834 rt_ifmsg(ifp); 1835 } 1836 1837 /* 1838 * Mark an interface up and notify protocols of 1839 * the transition. 1840 */ 1841 static void 1842 if_route(struct ifnet *ifp, int flag, int fam) 1843 { 1844 struct ifaddr *ifa; 1845 1846 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 1847 1848 ifp->if_flags |= flag; 1849 getmicrotime(&ifp->if_lastchange); 1850 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1851 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 1852 pfctlinput(PRC_IFUP, ifa->ifa_addr); 1853 if (ifp->if_carp) 1854 (*carp_linkstate_p)(ifp); 1855 rt_ifmsg(ifp); 1856 #ifdef INET6 1857 in6_if_up(ifp); 1858 #endif 1859 } 1860 1861 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 1862 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 1863 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 1864 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 1865 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 1866 int (*vlan_setcookie_p)(struct ifnet *, void *); 1867 void *(*vlan_cookie_p)(struct ifnet *); 1868 1869 /* 1870 * Handle a change in the interface link state. To avoid LORs 1871 * between driver lock and upper layer locks, as well as possible 1872 * recursions, we post event to taskqueue, and all job 1873 * is done in static do_link_state_change(). 1874 */ 1875 void 1876 if_link_state_change(struct ifnet *ifp, int link_state) 1877 { 1878 /* Return if state hasn't changed. */ 1879 if (ifp->if_link_state == link_state) 1880 return; 1881 1882 ifp->if_link_state = link_state; 1883 1884 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 1885 } 1886 1887 static void 1888 do_link_state_change(void *arg, int pending) 1889 { 1890 struct ifnet *ifp = (struct ifnet *)arg; 1891 int link_state = ifp->if_link_state; 1892 CURVNET_SET(ifp->if_vnet); 1893 1894 /* Notify that the link state has changed. */ 1895 rt_ifmsg(ifp); 1896 if (ifp->if_vlantrunk != NULL) 1897 (*vlan_link_state_p)(ifp); 1898 1899 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 1900 IFP2AC(ifp)->ac_netgraph != NULL) 1901 (*ng_ether_link_state_p)(ifp, link_state); 1902 if (ifp->if_carp) 1903 (*carp_linkstate_p)(ifp); 1904 if (ifp->if_bridge) 1905 (*bridge_linkstate_p)(ifp); 1906 if (ifp->if_lagg) 1907 (*lagg_linkstate_p)(ifp, link_state); 1908 1909 if (IS_DEFAULT_VNET(curvnet)) 1910 devctl_notify("IFNET", ifp->if_xname, 1911 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 1912 NULL); 1913 if (pending > 1) 1914 if_printf(ifp, "%d link states coalesced\n", pending); 1915 if (log_link_state_change) 1916 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 1917 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 1918 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 1919 CURVNET_RESTORE(); 1920 } 1921 1922 /* 1923 * Mark an interface down and notify protocols of 1924 * the transition. 1925 */ 1926 void 1927 if_down(struct ifnet *ifp) 1928 { 1929 1930 if_unroute(ifp, IFF_UP, AF_UNSPEC); 1931 } 1932 1933 /* 1934 * Mark an interface up and notify protocols of 1935 * the transition. 1936 */ 1937 void 1938 if_up(struct ifnet *ifp) 1939 { 1940 1941 if_route(ifp, IFF_UP, AF_UNSPEC); 1942 } 1943 1944 /* 1945 * Flush an interface queue. 1946 */ 1947 void 1948 if_qflush(struct ifnet *ifp) 1949 { 1950 struct mbuf *m, *n; 1951 struct ifaltq *ifq; 1952 1953 ifq = &ifp->if_snd; 1954 IFQ_LOCK(ifq); 1955 #ifdef ALTQ 1956 if (ALTQ_IS_ENABLED(ifq)) 1957 ALTQ_PURGE(ifq); 1958 #endif 1959 n = ifq->ifq_head; 1960 while ((m = n) != 0) { 1961 n = m->m_act; 1962 m_freem(m); 1963 } 1964 ifq->ifq_head = 0; 1965 ifq->ifq_tail = 0; 1966 ifq->ifq_len = 0; 1967 IFQ_UNLOCK(ifq); 1968 } 1969 1970 /* 1971 * Map interface name to interface structure pointer, with or without 1972 * returning a reference. 1973 */ 1974 struct ifnet * 1975 ifunit_ref(const char *name) 1976 { 1977 struct ifnet *ifp; 1978 1979 IFNET_RLOCK_NOSLEEP(); 1980 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1981 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 1982 !(ifp->if_flags & IFF_DYING)) 1983 break; 1984 } 1985 if (ifp != NULL) 1986 if_ref(ifp); 1987 IFNET_RUNLOCK_NOSLEEP(); 1988 return (ifp); 1989 } 1990 1991 struct ifnet * 1992 ifunit(const char *name) 1993 { 1994 struct ifnet *ifp; 1995 1996 IFNET_RLOCK_NOSLEEP(); 1997 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1998 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 1999 break; 2000 } 2001 IFNET_RUNLOCK_NOSLEEP(); 2002 return (ifp); 2003 } 2004 2005 /* 2006 * Hardware specific interface ioctls. 2007 */ 2008 static int 2009 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2010 { 2011 struct ifreq *ifr; 2012 struct ifstat *ifs; 2013 int error = 0; 2014 int new_flags, temp_flags; 2015 size_t namelen, onamelen; 2016 size_t descrlen; 2017 char *descrbuf, *odescrbuf; 2018 char new_name[IFNAMSIZ]; 2019 struct ifaddr *ifa; 2020 struct sockaddr_dl *sdl; 2021 2022 ifr = (struct ifreq *)data; 2023 switch (cmd) { 2024 case SIOCGIFINDEX: 2025 ifr->ifr_index = ifp->if_index; 2026 break; 2027 2028 case SIOCGIFFLAGS: 2029 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2030 ifr->ifr_flags = temp_flags & 0xffff; 2031 ifr->ifr_flagshigh = temp_flags >> 16; 2032 break; 2033 2034 case SIOCGIFCAP: 2035 ifr->ifr_reqcap = ifp->if_capabilities; 2036 ifr->ifr_curcap = ifp->if_capenable; 2037 break; 2038 2039 #ifdef MAC 2040 case SIOCGIFMAC: 2041 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2042 break; 2043 #endif 2044 2045 case SIOCGIFMETRIC: 2046 ifr->ifr_metric = ifp->if_metric; 2047 break; 2048 2049 case SIOCGIFMTU: 2050 ifr->ifr_mtu = ifp->if_mtu; 2051 break; 2052 2053 case SIOCGIFPHYS: 2054 ifr->ifr_phys = ifp->if_physical; 2055 break; 2056 2057 case SIOCGIFDESCR: 2058 error = 0; 2059 sx_slock(&ifdescr_sx); 2060 if (ifp->if_description == NULL) 2061 error = ENOMSG; 2062 else { 2063 /* space for terminating nul */ 2064 descrlen = strlen(ifp->if_description) + 1; 2065 if (ifr->ifr_buffer.length < descrlen) 2066 ifr->ifr_buffer.buffer = NULL; 2067 else 2068 error = copyout(ifp->if_description, 2069 ifr->ifr_buffer.buffer, descrlen); 2070 ifr->ifr_buffer.length = descrlen; 2071 } 2072 sx_sunlock(&ifdescr_sx); 2073 break; 2074 2075 case SIOCSIFDESCR: 2076 error = priv_check(td, PRIV_NET_SETIFDESCR); 2077 if (error) 2078 return (error); 2079 2080 /* 2081 * Copy only (length-1) bytes to make sure that 2082 * if_description is always nul terminated. The 2083 * length parameter is supposed to count the 2084 * terminating nul in. 2085 */ 2086 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2087 return (ENAMETOOLONG); 2088 else if (ifr->ifr_buffer.length == 0) 2089 descrbuf = NULL; 2090 else { 2091 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2092 M_WAITOK | M_ZERO); 2093 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2094 ifr->ifr_buffer.length - 1); 2095 if (error) { 2096 free(descrbuf, M_IFDESCR); 2097 break; 2098 } 2099 } 2100 2101 sx_xlock(&ifdescr_sx); 2102 odescrbuf = ifp->if_description; 2103 ifp->if_description = descrbuf; 2104 sx_xunlock(&ifdescr_sx); 2105 2106 getmicrotime(&ifp->if_lastchange); 2107 free(odescrbuf, M_IFDESCR); 2108 break; 2109 2110 case SIOCGIFFIB: 2111 ifr->ifr_fib = ifp->if_fib; 2112 break; 2113 2114 case SIOCSIFFIB: 2115 error = priv_check(td, PRIV_NET_SETIFFIB); 2116 if (error) 2117 return (error); 2118 if (ifr->ifr_fib >= rt_numfibs) 2119 return (EINVAL); 2120 2121 ifp->if_fib = ifr->ifr_fib; 2122 break; 2123 2124 case SIOCSIFFLAGS: 2125 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2126 if (error) 2127 return (error); 2128 /* 2129 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2130 * check, so we don't need special handling here yet. 2131 */ 2132 new_flags = (ifr->ifr_flags & 0xffff) | 2133 (ifr->ifr_flagshigh << 16); 2134 if (ifp->if_flags & IFF_SMART) { 2135 /* Smart drivers twiddle their own routes */ 2136 } else if (ifp->if_flags & IFF_UP && 2137 (new_flags & IFF_UP) == 0) { 2138 if_down(ifp); 2139 } else if (new_flags & IFF_UP && 2140 (ifp->if_flags & IFF_UP) == 0) { 2141 if_up(ifp); 2142 } 2143 /* See if permanently promiscuous mode bit is about to flip */ 2144 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2145 if (new_flags & IFF_PPROMISC) 2146 ifp->if_flags |= IFF_PROMISC; 2147 else if (ifp->if_pcount == 0) 2148 ifp->if_flags &= ~IFF_PROMISC; 2149 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2150 ifp->if_xname, 2151 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2152 } 2153 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2154 (new_flags &~ IFF_CANTCHANGE); 2155 if (ifp->if_ioctl) { 2156 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2157 } 2158 getmicrotime(&ifp->if_lastchange); 2159 break; 2160 2161 case SIOCSIFCAP: 2162 error = priv_check(td, PRIV_NET_SETIFCAP); 2163 if (error) 2164 return (error); 2165 if (ifp->if_ioctl == NULL) 2166 return (EOPNOTSUPP); 2167 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2168 return (EINVAL); 2169 error = (*ifp->if_ioctl)(ifp, cmd, data); 2170 if (error == 0) 2171 getmicrotime(&ifp->if_lastchange); 2172 break; 2173 2174 #ifdef MAC 2175 case SIOCSIFMAC: 2176 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2177 break; 2178 #endif 2179 2180 case SIOCSIFNAME: 2181 error = priv_check(td, PRIV_NET_SETIFNAME); 2182 if (error) 2183 return (error); 2184 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2185 if (error != 0) 2186 return (error); 2187 if (new_name[0] == '\0') 2188 return (EINVAL); 2189 if (ifunit(new_name) != NULL) 2190 return (EEXIST); 2191 2192 /* 2193 * XXX: Locking. Nothing else seems to lock if_flags, 2194 * and there are numerous other races with the 2195 * ifunit() checks not being atomic with namespace 2196 * changes (renames, vmoves, if_attach, etc). 2197 */ 2198 ifp->if_flags |= IFF_RENAMING; 2199 2200 /* Announce the departure of the interface. */ 2201 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2202 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2203 2204 log(LOG_INFO, "%s: changing name to '%s'\n", 2205 ifp->if_xname, new_name); 2206 2207 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2208 ifa = ifp->if_addr; 2209 IFA_LOCK(ifa); 2210 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2211 namelen = strlen(new_name); 2212 onamelen = sdl->sdl_nlen; 2213 /* 2214 * Move the address if needed. This is safe because we 2215 * allocate space for a name of length IFNAMSIZ when we 2216 * create this in if_attach(). 2217 */ 2218 if (namelen != onamelen) { 2219 bcopy(sdl->sdl_data + onamelen, 2220 sdl->sdl_data + namelen, sdl->sdl_alen); 2221 } 2222 bcopy(new_name, sdl->sdl_data, namelen); 2223 sdl->sdl_nlen = namelen; 2224 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2225 bzero(sdl->sdl_data, onamelen); 2226 while (namelen != 0) 2227 sdl->sdl_data[--namelen] = 0xff; 2228 IFA_UNLOCK(ifa); 2229 2230 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2231 /* Announce the return of the interface. */ 2232 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2233 2234 ifp->if_flags &= ~IFF_RENAMING; 2235 break; 2236 2237 #ifdef VIMAGE 2238 case SIOCSIFVNET: 2239 error = priv_check(td, PRIV_NET_SETIFVNET); 2240 if (error) 2241 return (error); 2242 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2243 break; 2244 #endif 2245 2246 case SIOCSIFMETRIC: 2247 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2248 if (error) 2249 return (error); 2250 ifp->if_metric = ifr->ifr_metric; 2251 getmicrotime(&ifp->if_lastchange); 2252 break; 2253 2254 case SIOCSIFPHYS: 2255 error = priv_check(td, PRIV_NET_SETIFPHYS); 2256 if (error) 2257 return (error); 2258 if (ifp->if_ioctl == NULL) 2259 return (EOPNOTSUPP); 2260 error = (*ifp->if_ioctl)(ifp, cmd, data); 2261 if (error == 0) 2262 getmicrotime(&ifp->if_lastchange); 2263 break; 2264 2265 case SIOCSIFMTU: 2266 { 2267 u_long oldmtu = ifp->if_mtu; 2268 2269 error = priv_check(td, PRIV_NET_SETIFMTU); 2270 if (error) 2271 return (error); 2272 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2273 return (EINVAL); 2274 if (ifp->if_ioctl == NULL) 2275 return (EOPNOTSUPP); 2276 error = (*ifp->if_ioctl)(ifp, cmd, data); 2277 if (error == 0) { 2278 getmicrotime(&ifp->if_lastchange); 2279 rt_ifmsg(ifp); 2280 } 2281 /* 2282 * If the link MTU changed, do network layer specific procedure. 2283 */ 2284 if (ifp->if_mtu != oldmtu) { 2285 #ifdef INET6 2286 nd6_setmtu(ifp); 2287 #endif 2288 } 2289 break; 2290 } 2291 2292 case SIOCADDMULTI: 2293 case SIOCDELMULTI: 2294 if (cmd == SIOCADDMULTI) 2295 error = priv_check(td, PRIV_NET_ADDMULTI); 2296 else 2297 error = priv_check(td, PRIV_NET_DELMULTI); 2298 if (error) 2299 return (error); 2300 2301 /* Don't allow group membership on non-multicast interfaces. */ 2302 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2303 return (EOPNOTSUPP); 2304 2305 /* Don't let users screw up protocols' entries. */ 2306 if (ifr->ifr_addr.sa_family != AF_LINK) 2307 return (EINVAL); 2308 2309 if (cmd == SIOCADDMULTI) { 2310 struct ifmultiaddr *ifma; 2311 2312 /* 2313 * Userland is only permitted to join groups once 2314 * via the if_addmulti() KPI, because it cannot hold 2315 * struct ifmultiaddr * between calls. It may also 2316 * lose a race while we check if the membership 2317 * already exists. 2318 */ 2319 IF_ADDR_RLOCK(ifp); 2320 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2321 IF_ADDR_RUNLOCK(ifp); 2322 if (ifma != NULL) 2323 error = EADDRINUSE; 2324 else 2325 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2326 } else { 2327 error = if_delmulti(ifp, &ifr->ifr_addr); 2328 } 2329 if (error == 0) 2330 getmicrotime(&ifp->if_lastchange); 2331 break; 2332 2333 case SIOCSIFPHYADDR: 2334 case SIOCDIFPHYADDR: 2335 #ifdef INET6 2336 case SIOCSIFPHYADDR_IN6: 2337 #endif 2338 case SIOCSLIFPHYADDR: 2339 case SIOCSIFMEDIA: 2340 case SIOCSIFGENERIC: 2341 error = priv_check(td, PRIV_NET_HWIOCTL); 2342 if (error) 2343 return (error); 2344 if (ifp->if_ioctl == NULL) 2345 return (EOPNOTSUPP); 2346 error = (*ifp->if_ioctl)(ifp, cmd, data); 2347 if (error == 0) 2348 getmicrotime(&ifp->if_lastchange); 2349 break; 2350 2351 case SIOCGIFSTATUS: 2352 ifs = (struct ifstat *)data; 2353 ifs->ascii[0] = '\0'; 2354 2355 case SIOCGIFPSRCADDR: 2356 case SIOCGIFPDSTADDR: 2357 case SIOCGLIFPHYADDR: 2358 case SIOCGIFMEDIA: 2359 case SIOCGIFGENERIC: 2360 if (ifp->if_ioctl == NULL) 2361 return (EOPNOTSUPP); 2362 error = (*ifp->if_ioctl)(ifp, cmd, data); 2363 break; 2364 2365 case SIOCSIFLLADDR: 2366 error = priv_check(td, PRIV_NET_SETLLADDR); 2367 if (error) 2368 return (error); 2369 error = if_setlladdr(ifp, 2370 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2371 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2372 break; 2373 2374 case SIOCAIFGROUP: 2375 { 2376 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2377 2378 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2379 if (error) 2380 return (error); 2381 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2382 return (error); 2383 break; 2384 } 2385 2386 case SIOCGIFGROUP: 2387 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2388 return (error); 2389 break; 2390 2391 case SIOCDIFGROUP: 2392 { 2393 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2394 2395 error = priv_check(td, PRIV_NET_DELIFGROUP); 2396 if (error) 2397 return (error); 2398 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2399 return (error); 2400 break; 2401 } 2402 2403 default: 2404 error = ENOIOCTL; 2405 break; 2406 } 2407 return (error); 2408 } 2409 2410 #ifdef COMPAT_FREEBSD32 2411 struct ifconf32 { 2412 int32_t ifc_len; 2413 union { 2414 uint32_t ifcu_buf; 2415 uint32_t ifcu_req; 2416 } ifc_ifcu; 2417 }; 2418 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2419 #endif 2420 2421 /* 2422 * Interface ioctls. 2423 */ 2424 int 2425 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2426 { 2427 struct ifnet *ifp; 2428 struct ifreq *ifr; 2429 int error; 2430 int oif_flags; 2431 2432 CURVNET_SET(so->so_vnet); 2433 switch (cmd) { 2434 case SIOCGIFCONF: 2435 case OSIOCGIFCONF: 2436 error = ifconf(cmd, data); 2437 CURVNET_RESTORE(); 2438 return (error); 2439 2440 #ifdef COMPAT_FREEBSD32 2441 case SIOCGIFCONF32: 2442 { 2443 struct ifconf32 *ifc32; 2444 struct ifconf ifc; 2445 2446 ifc32 = (struct ifconf32 *)data; 2447 ifc.ifc_len = ifc32->ifc_len; 2448 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2449 2450 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2451 CURVNET_RESTORE(); 2452 if (error == 0) 2453 ifc32->ifc_len = ifc.ifc_len; 2454 return (error); 2455 } 2456 #endif 2457 } 2458 ifr = (struct ifreq *)data; 2459 2460 switch (cmd) { 2461 #ifdef VIMAGE 2462 case SIOCSIFRVNET: 2463 error = priv_check(td, PRIV_NET_SETIFVNET); 2464 if (error == 0) 2465 error = if_vmove_reclaim(td, ifr->ifr_name, 2466 ifr->ifr_jid); 2467 CURVNET_RESTORE(); 2468 return (error); 2469 #endif 2470 case SIOCIFCREATE: 2471 case SIOCIFCREATE2: 2472 error = priv_check(td, PRIV_NET_IFCREATE); 2473 if (error == 0) 2474 error = if_clone_create(ifr->ifr_name, 2475 sizeof(ifr->ifr_name), 2476 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2477 CURVNET_RESTORE(); 2478 return (error); 2479 case SIOCIFDESTROY: 2480 error = priv_check(td, PRIV_NET_IFDESTROY); 2481 if (error == 0) 2482 error = if_clone_destroy(ifr->ifr_name); 2483 CURVNET_RESTORE(); 2484 return (error); 2485 2486 case SIOCIFGCLONERS: 2487 error = if_clone_list((struct if_clonereq *)data); 2488 CURVNET_RESTORE(); 2489 return (error); 2490 case SIOCGIFGMEMB: 2491 error = if_getgroupmembers((struct ifgroupreq *)data); 2492 CURVNET_RESTORE(); 2493 return (error); 2494 #if defined(INET) || defined(INET6) 2495 case SIOCSVH: 2496 case SIOCGVH: 2497 if (carp_ioctl_p == NULL) 2498 error = EPROTONOSUPPORT; 2499 else 2500 error = (*carp_ioctl_p)(ifr, cmd, td); 2501 CURVNET_RESTORE(); 2502 return (error); 2503 #endif 2504 } 2505 2506 ifp = ifunit_ref(ifr->ifr_name); 2507 if (ifp == NULL) { 2508 CURVNET_RESTORE(); 2509 return (ENXIO); 2510 } 2511 2512 error = ifhwioctl(cmd, ifp, data, td); 2513 if (error != ENOIOCTL) { 2514 if_rele(ifp); 2515 CURVNET_RESTORE(); 2516 return (error); 2517 } 2518 2519 oif_flags = ifp->if_flags; 2520 if (so->so_proto == NULL) { 2521 if_rele(ifp); 2522 CURVNET_RESTORE(); 2523 return (EOPNOTSUPP); 2524 } 2525 #ifndef COMPAT_43 2526 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, 2527 data, 2528 ifp, td)); 2529 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL) 2530 error = (*ifp->if_ioctl)(ifp, cmd, data); 2531 #else 2532 { 2533 u_long ocmd = cmd; 2534 2535 switch (cmd) { 2536 2537 case SIOCSIFDSTADDR: 2538 case SIOCSIFADDR: 2539 case SIOCSIFBRDADDR: 2540 case SIOCSIFNETMASK: 2541 #if BYTE_ORDER != BIG_ENDIAN 2542 if (ifr->ifr_addr.sa_family == 0 && 2543 ifr->ifr_addr.sa_len < 16) { 2544 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len; 2545 ifr->ifr_addr.sa_len = 16; 2546 } 2547 #else 2548 if (ifr->ifr_addr.sa_len == 0) 2549 ifr->ifr_addr.sa_len = 16; 2550 #endif 2551 break; 2552 2553 case OSIOCGIFADDR: 2554 cmd = SIOCGIFADDR; 2555 break; 2556 2557 case OSIOCGIFDSTADDR: 2558 cmd = SIOCGIFDSTADDR; 2559 break; 2560 2561 case OSIOCGIFBRDADDR: 2562 cmd = SIOCGIFBRDADDR; 2563 break; 2564 2565 case OSIOCGIFNETMASK: 2566 cmd = SIOCGIFNETMASK; 2567 } 2568 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, 2569 cmd, 2570 data, 2571 ifp, td)); 2572 if (error == EOPNOTSUPP && ifp != NULL && 2573 ifp->if_ioctl != NULL) 2574 error = (*ifp->if_ioctl)(ifp, cmd, data); 2575 switch (ocmd) { 2576 2577 case OSIOCGIFADDR: 2578 case OSIOCGIFDSTADDR: 2579 case OSIOCGIFBRDADDR: 2580 case OSIOCGIFNETMASK: 2581 *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family; 2582 2583 } 2584 } 2585 #endif /* COMPAT_43 */ 2586 2587 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2588 #ifdef INET6 2589 if (ifp->if_flags & IFF_UP) 2590 in6_if_up(ifp); 2591 #endif 2592 } 2593 if_rele(ifp); 2594 CURVNET_RESTORE(); 2595 return (error); 2596 } 2597 2598 /* 2599 * The code common to handling reference counted flags, 2600 * e.g., in ifpromisc() and if_allmulti(). 2601 * The "pflag" argument can specify a permanent mode flag to check, 2602 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2603 * 2604 * Only to be used on stack-owned flags, not driver-owned flags. 2605 */ 2606 static int 2607 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2608 { 2609 struct ifreq ifr; 2610 int error; 2611 int oldflags, oldcount; 2612 2613 /* Sanity checks to catch programming errors */ 2614 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2615 ("%s: setting driver-owned flag %d", __func__, flag)); 2616 2617 if (onswitch) 2618 KASSERT(*refcount >= 0, 2619 ("%s: increment negative refcount %d for flag %d", 2620 __func__, *refcount, flag)); 2621 else 2622 KASSERT(*refcount > 0, 2623 ("%s: decrement non-positive refcount %d for flag %d", 2624 __func__, *refcount, flag)); 2625 2626 /* In case this mode is permanent, just touch refcount */ 2627 if (ifp->if_flags & pflag) { 2628 *refcount += onswitch ? 1 : -1; 2629 return (0); 2630 } 2631 2632 /* Save ifnet parameters for if_ioctl() may fail */ 2633 oldcount = *refcount; 2634 oldflags = ifp->if_flags; 2635 2636 /* 2637 * See if we aren't the only and touching refcount is enough. 2638 * Actually toggle interface flag if we are the first or last. 2639 */ 2640 if (onswitch) { 2641 if ((*refcount)++) 2642 return (0); 2643 ifp->if_flags |= flag; 2644 } else { 2645 if (--(*refcount)) 2646 return (0); 2647 ifp->if_flags &= ~flag; 2648 } 2649 2650 /* Call down the driver since we've changed interface flags */ 2651 if (ifp->if_ioctl == NULL) { 2652 error = EOPNOTSUPP; 2653 goto recover; 2654 } 2655 ifr.ifr_flags = ifp->if_flags & 0xffff; 2656 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2657 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2658 if (error) 2659 goto recover; 2660 /* Notify userland that interface flags have changed */ 2661 rt_ifmsg(ifp); 2662 return (0); 2663 2664 recover: 2665 /* Recover after driver error */ 2666 *refcount = oldcount; 2667 ifp->if_flags = oldflags; 2668 return (error); 2669 } 2670 2671 /* 2672 * Set/clear promiscuous mode on interface ifp based on the truth value 2673 * of pswitch. The calls are reference counted so that only the first 2674 * "on" request actually has an effect, as does the final "off" request. 2675 * Results are undefined if the "off" and "on" requests are not matched. 2676 */ 2677 int 2678 ifpromisc(struct ifnet *ifp, int pswitch) 2679 { 2680 int error; 2681 int oldflags = ifp->if_flags; 2682 2683 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2684 &ifp->if_pcount, pswitch); 2685 /* If promiscuous mode status has changed, log a message */ 2686 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2687 log(LOG_INFO, "%s: promiscuous mode %s\n", 2688 ifp->if_xname, 2689 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2690 return (error); 2691 } 2692 2693 /* 2694 * Return interface configuration 2695 * of system. List may be used 2696 * in later ioctl's (above) to get 2697 * other information. 2698 */ 2699 /*ARGSUSED*/ 2700 static int 2701 ifconf(u_long cmd, caddr_t data) 2702 { 2703 struct ifconf *ifc = (struct ifconf *)data; 2704 struct ifnet *ifp; 2705 struct ifaddr *ifa; 2706 struct ifreq ifr; 2707 struct sbuf *sb; 2708 int error, full = 0, valid_len, max_len; 2709 2710 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2711 max_len = MAXPHYS - 1; 2712 2713 /* Prevent hostile input from being able to crash the system */ 2714 if (ifc->ifc_len <= 0) 2715 return (EINVAL); 2716 2717 again: 2718 if (ifc->ifc_len <= max_len) { 2719 max_len = ifc->ifc_len; 2720 full = 1; 2721 } 2722 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2723 max_len = 0; 2724 valid_len = 0; 2725 2726 IFNET_RLOCK(); 2727 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2728 int addrs; 2729 2730 /* 2731 * Zero the ifr_name buffer to make sure we don't 2732 * disclose the contents of the stack. 2733 */ 2734 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2735 2736 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2737 >= sizeof(ifr.ifr_name)) { 2738 sbuf_delete(sb); 2739 IFNET_RUNLOCK(); 2740 return (ENAMETOOLONG); 2741 } 2742 2743 addrs = 0; 2744 IF_ADDR_RLOCK(ifp); 2745 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2746 struct sockaddr *sa = ifa->ifa_addr; 2747 2748 if (prison_if(curthread->td_ucred, sa) != 0) 2749 continue; 2750 addrs++; 2751 #ifdef COMPAT_43 2752 if (cmd == OSIOCGIFCONF) { 2753 struct osockaddr *osa = 2754 (struct osockaddr *)&ifr.ifr_addr; 2755 ifr.ifr_addr = *sa; 2756 osa->sa_family = sa->sa_family; 2757 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2758 max_len += sizeof(ifr); 2759 } else 2760 #endif 2761 if (sa->sa_len <= sizeof(*sa)) { 2762 ifr.ifr_addr = *sa; 2763 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2764 max_len += sizeof(ifr); 2765 } else { 2766 sbuf_bcat(sb, &ifr, 2767 offsetof(struct ifreq, ifr_addr)); 2768 max_len += offsetof(struct ifreq, ifr_addr); 2769 sbuf_bcat(sb, sa, sa->sa_len); 2770 max_len += sa->sa_len; 2771 } 2772 2773 if (sbuf_error(sb) == 0) 2774 valid_len = sbuf_len(sb); 2775 } 2776 IF_ADDR_RUNLOCK(ifp); 2777 if (addrs == 0) { 2778 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2779 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2780 max_len += sizeof(ifr); 2781 2782 if (sbuf_error(sb) == 0) 2783 valid_len = sbuf_len(sb); 2784 } 2785 } 2786 IFNET_RUNLOCK(); 2787 2788 /* 2789 * If we didn't allocate enough space (uncommon), try again. If 2790 * we have already allocated as much space as we are allowed, 2791 * return what we've got. 2792 */ 2793 if (valid_len != max_len && !full) { 2794 sbuf_delete(sb); 2795 goto again; 2796 } 2797 2798 ifc->ifc_len = valid_len; 2799 sbuf_finish(sb); 2800 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2801 sbuf_delete(sb); 2802 return (error); 2803 } 2804 2805 /* 2806 * Just like ifpromisc(), but for all-multicast-reception mode. 2807 */ 2808 int 2809 if_allmulti(struct ifnet *ifp, int onswitch) 2810 { 2811 2812 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2813 } 2814 2815 struct ifmultiaddr * 2816 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2817 { 2818 struct ifmultiaddr *ifma; 2819 2820 IF_ADDR_LOCK_ASSERT(ifp); 2821 2822 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2823 if (sa->sa_family == AF_LINK) { 2824 if (sa_dl_equal(ifma->ifma_addr, sa)) 2825 break; 2826 } else { 2827 if (sa_equal(ifma->ifma_addr, sa)) 2828 break; 2829 } 2830 } 2831 2832 return ifma; 2833 } 2834 2835 /* 2836 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 2837 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 2838 * the ifnet multicast address list here, so the caller must do that and 2839 * other setup work (such as notifying the device driver). The reference 2840 * count is initialized to 1. 2841 */ 2842 static struct ifmultiaddr * 2843 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 2844 int mflags) 2845 { 2846 struct ifmultiaddr *ifma; 2847 struct sockaddr *dupsa; 2848 2849 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 2850 M_ZERO); 2851 if (ifma == NULL) 2852 return (NULL); 2853 2854 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 2855 if (dupsa == NULL) { 2856 free(ifma, M_IFMADDR); 2857 return (NULL); 2858 } 2859 bcopy(sa, dupsa, sa->sa_len); 2860 ifma->ifma_addr = dupsa; 2861 2862 ifma->ifma_ifp = ifp; 2863 ifma->ifma_refcount = 1; 2864 ifma->ifma_protospec = NULL; 2865 2866 if (llsa == NULL) { 2867 ifma->ifma_lladdr = NULL; 2868 return (ifma); 2869 } 2870 2871 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 2872 if (dupsa == NULL) { 2873 free(ifma->ifma_addr, M_IFMADDR); 2874 free(ifma, M_IFMADDR); 2875 return (NULL); 2876 } 2877 bcopy(llsa, dupsa, llsa->sa_len); 2878 ifma->ifma_lladdr = dupsa; 2879 2880 return (ifma); 2881 } 2882 2883 /* 2884 * if_freemulti: free ifmultiaddr structure and possibly attached related 2885 * addresses. The caller is responsible for implementing reference 2886 * counting, notifying the driver, handling routing messages, and releasing 2887 * any dependent link layer state. 2888 */ 2889 static void 2890 if_freemulti(struct ifmultiaddr *ifma) 2891 { 2892 2893 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 2894 ifma->ifma_refcount)); 2895 KASSERT(ifma->ifma_protospec == NULL, 2896 ("if_freemulti: protospec not NULL")); 2897 2898 if (ifma->ifma_lladdr != NULL) 2899 free(ifma->ifma_lladdr, M_IFMADDR); 2900 free(ifma->ifma_addr, M_IFMADDR); 2901 free(ifma, M_IFMADDR); 2902 } 2903 2904 /* 2905 * Register an additional multicast address with a network interface. 2906 * 2907 * - If the address is already present, bump the reference count on the 2908 * address and return. 2909 * - If the address is not link-layer, look up a link layer address. 2910 * - Allocate address structures for one or both addresses, and attach to the 2911 * multicast address list on the interface. If automatically adding a link 2912 * layer address, the protocol address will own a reference to the link 2913 * layer address, to be freed when it is freed. 2914 * - Notify the network device driver of an addition to the multicast address 2915 * list. 2916 * 2917 * 'sa' points to caller-owned memory with the desired multicast address. 2918 * 2919 * 'retifma' will be used to return a pointer to the resulting multicast 2920 * address reference, if desired. 2921 */ 2922 int 2923 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 2924 struct ifmultiaddr **retifma) 2925 { 2926 struct ifmultiaddr *ifma, *ll_ifma; 2927 struct sockaddr *llsa; 2928 int error; 2929 2930 /* 2931 * If the address is already present, return a new reference to it; 2932 * otherwise, allocate storage and set up a new address. 2933 */ 2934 IF_ADDR_WLOCK(ifp); 2935 ifma = if_findmulti(ifp, sa); 2936 if (ifma != NULL) { 2937 ifma->ifma_refcount++; 2938 if (retifma != NULL) 2939 *retifma = ifma; 2940 IF_ADDR_WUNLOCK(ifp); 2941 return (0); 2942 } 2943 2944 /* 2945 * The address isn't already present; resolve the protocol address 2946 * into a link layer address, and then look that up, bump its 2947 * refcount or allocate an ifma for that also. If 'llsa' was 2948 * returned, we will need to free it later. 2949 */ 2950 llsa = NULL; 2951 ll_ifma = NULL; 2952 if (ifp->if_resolvemulti != NULL) { 2953 error = ifp->if_resolvemulti(ifp, &llsa, sa); 2954 if (error) 2955 goto unlock_out; 2956 } 2957 2958 /* 2959 * Allocate the new address. Don't hook it up yet, as we may also 2960 * need to allocate a link layer multicast address. 2961 */ 2962 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 2963 if (ifma == NULL) { 2964 error = ENOMEM; 2965 goto free_llsa_out; 2966 } 2967 2968 /* 2969 * If a link layer address is found, we'll need to see if it's 2970 * already present in the address list, or allocate is as well. 2971 * When this block finishes, the link layer address will be on the 2972 * list. 2973 */ 2974 if (llsa != NULL) { 2975 ll_ifma = if_findmulti(ifp, llsa); 2976 if (ll_ifma == NULL) { 2977 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 2978 if (ll_ifma == NULL) { 2979 --ifma->ifma_refcount; 2980 if_freemulti(ifma); 2981 error = ENOMEM; 2982 goto free_llsa_out; 2983 } 2984 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 2985 ifma_link); 2986 } else 2987 ll_ifma->ifma_refcount++; 2988 ifma->ifma_llifma = ll_ifma; 2989 } 2990 2991 /* 2992 * We now have a new multicast address, ifma, and possibly a new or 2993 * referenced link layer address. Add the primary address to the 2994 * ifnet address list. 2995 */ 2996 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 2997 2998 if (retifma != NULL) 2999 *retifma = ifma; 3000 3001 /* 3002 * Must generate the message while holding the lock so that 'ifma' 3003 * pointer is still valid. 3004 */ 3005 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3006 IF_ADDR_WUNLOCK(ifp); 3007 3008 /* 3009 * We are certain we have added something, so call down to the 3010 * interface to let them know about it. 3011 */ 3012 if (ifp->if_ioctl != NULL) { 3013 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3014 } 3015 3016 if (llsa != NULL) 3017 free(llsa, M_IFMADDR); 3018 3019 return (0); 3020 3021 free_llsa_out: 3022 if (llsa != NULL) 3023 free(llsa, M_IFMADDR); 3024 3025 unlock_out: 3026 IF_ADDR_WUNLOCK(ifp); 3027 return (error); 3028 } 3029 3030 /* 3031 * Delete a multicast group membership by network-layer group address. 3032 * 3033 * Returns ENOENT if the entry could not be found. If ifp no longer 3034 * exists, results are undefined. This entry point should only be used 3035 * from subsystems which do appropriate locking to hold ifp for the 3036 * duration of the call. 3037 * Network-layer protocol domains must use if_delmulti_ifma(). 3038 */ 3039 int 3040 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3041 { 3042 struct ifmultiaddr *ifma; 3043 int lastref; 3044 #ifdef INVARIANTS 3045 struct ifnet *oifp; 3046 3047 IFNET_RLOCK_NOSLEEP(); 3048 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3049 if (ifp == oifp) 3050 break; 3051 if (ifp != oifp) 3052 ifp = NULL; 3053 IFNET_RUNLOCK_NOSLEEP(); 3054 3055 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3056 #endif 3057 if (ifp == NULL) 3058 return (ENOENT); 3059 3060 IF_ADDR_WLOCK(ifp); 3061 lastref = 0; 3062 ifma = if_findmulti(ifp, sa); 3063 if (ifma != NULL) 3064 lastref = if_delmulti_locked(ifp, ifma, 0); 3065 IF_ADDR_WUNLOCK(ifp); 3066 3067 if (ifma == NULL) 3068 return (ENOENT); 3069 3070 if (lastref && ifp->if_ioctl != NULL) { 3071 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3072 } 3073 3074 return (0); 3075 } 3076 3077 /* 3078 * Delete all multicast group membership for an interface. 3079 * Should be used to quickly flush all multicast filters. 3080 */ 3081 void 3082 if_delallmulti(struct ifnet *ifp) 3083 { 3084 struct ifmultiaddr *ifma; 3085 struct ifmultiaddr *next; 3086 3087 IF_ADDR_WLOCK(ifp); 3088 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3089 if_delmulti_locked(ifp, ifma, 0); 3090 IF_ADDR_WUNLOCK(ifp); 3091 } 3092 3093 /* 3094 * Delete a multicast group membership by group membership pointer. 3095 * Network-layer protocol domains must use this routine. 3096 * 3097 * It is safe to call this routine if the ifp disappeared. 3098 */ 3099 void 3100 if_delmulti_ifma(struct ifmultiaddr *ifma) 3101 { 3102 struct ifnet *ifp; 3103 int lastref; 3104 3105 ifp = ifma->ifma_ifp; 3106 #ifdef DIAGNOSTIC 3107 if (ifp == NULL) { 3108 printf("%s: ifma_ifp seems to be detached\n", __func__); 3109 } else { 3110 struct ifnet *oifp; 3111 3112 IFNET_RLOCK_NOSLEEP(); 3113 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3114 if (ifp == oifp) 3115 break; 3116 if (ifp != oifp) { 3117 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3118 ifp = NULL; 3119 } 3120 IFNET_RUNLOCK_NOSLEEP(); 3121 } 3122 #endif 3123 /* 3124 * If and only if the ifnet instance exists: Acquire the address lock. 3125 */ 3126 if (ifp != NULL) 3127 IF_ADDR_WLOCK(ifp); 3128 3129 lastref = if_delmulti_locked(ifp, ifma, 0); 3130 3131 if (ifp != NULL) { 3132 /* 3133 * If and only if the ifnet instance exists: 3134 * Release the address lock. 3135 * If the group was left: update the hardware hash filter. 3136 */ 3137 IF_ADDR_WUNLOCK(ifp); 3138 if (lastref && ifp->if_ioctl != NULL) { 3139 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3140 } 3141 } 3142 } 3143 3144 /* 3145 * Perform deletion of network-layer and/or link-layer multicast address. 3146 * 3147 * Return 0 if the reference count was decremented. 3148 * Return 1 if the final reference was released, indicating that the 3149 * hardware hash filter should be reprogrammed. 3150 */ 3151 static int 3152 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3153 { 3154 struct ifmultiaddr *ll_ifma; 3155 3156 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3157 KASSERT(ifma->ifma_ifp == ifp, 3158 ("%s: inconsistent ifp %p", __func__, ifp)); 3159 IF_ADDR_WLOCK_ASSERT(ifp); 3160 } 3161 3162 ifp = ifma->ifma_ifp; 3163 3164 /* 3165 * If the ifnet is detaching, null out references to ifnet, 3166 * so that upper protocol layers will notice, and not attempt 3167 * to obtain locks for an ifnet which no longer exists. The 3168 * routing socket announcement must happen before the ifnet 3169 * instance is detached from the system. 3170 */ 3171 if (detaching) { 3172 #ifdef DIAGNOSTIC 3173 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3174 #endif 3175 /* 3176 * ifp may already be nulled out if we are being reentered 3177 * to delete the ll_ifma. 3178 */ 3179 if (ifp != NULL) { 3180 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3181 ifma->ifma_ifp = NULL; 3182 } 3183 } 3184 3185 if (--ifma->ifma_refcount > 0) 3186 return 0; 3187 3188 /* 3189 * If this ifma is a network-layer ifma, a link-layer ifma may 3190 * have been associated with it. Release it first if so. 3191 */ 3192 ll_ifma = ifma->ifma_llifma; 3193 if (ll_ifma != NULL) { 3194 KASSERT(ifma->ifma_lladdr != NULL, 3195 ("%s: llifma w/o lladdr", __func__)); 3196 if (detaching) 3197 ll_ifma->ifma_ifp = NULL; /* XXX */ 3198 if (--ll_ifma->ifma_refcount == 0) { 3199 if (ifp != NULL) { 3200 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3201 ifma_link); 3202 } 3203 if_freemulti(ll_ifma); 3204 } 3205 } 3206 3207 if (ifp != NULL) 3208 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3209 3210 if_freemulti(ifma); 3211 3212 /* 3213 * The last reference to this instance of struct ifmultiaddr 3214 * was released; the hardware should be notified of this change. 3215 */ 3216 return 1; 3217 } 3218 3219 /* 3220 * Set the link layer address on an interface. 3221 * 3222 * At this time we only support certain types of interfaces, 3223 * and we don't allow the length of the address to change. 3224 */ 3225 int 3226 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3227 { 3228 struct sockaddr_dl *sdl; 3229 struct ifaddr *ifa; 3230 struct ifreq ifr; 3231 3232 IF_ADDR_RLOCK(ifp); 3233 ifa = ifp->if_addr; 3234 if (ifa == NULL) { 3235 IF_ADDR_RUNLOCK(ifp); 3236 return (EINVAL); 3237 } 3238 ifa_ref(ifa); 3239 IF_ADDR_RUNLOCK(ifp); 3240 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3241 if (sdl == NULL) { 3242 ifa_free(ifa); 3243 return (EINVAL); 3244 } 3245 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3246 ifa_free(ifa); 3247 return (EINVAL); 3248 } 3249 switch (ifp->if_type) { 3250 case IFT_ETHER: 3251 case IFT_FDDI: 3252 case IFT_XETHER: 3253 case IFT_ISO88025: 3254 case IFT_L2VLAN: 3255 case IFT_BRIDGE: 3256 case IFT_ARCNET: 3257 case IFT_IEEE8023ADLAG: 3258 case IFT_IEEE80211: 3259 bcopy(lladdr, LLADDR(sdl), len); 3260 ifa_free(ifa); 3261 break; 3262 default: 3263 ifa_free(ifa); 3264 return (ENODEV); 3265 } 3266 3267 /* 3268 * If the interface is already up, we need 3269 * to re-init it in order to reprogram its 3270 * address filter. 3271 */ 3272 if ((ifp->if_flags & IFF_UP) != 0) { 3273 if (ifp->if_ioctl) { 3274 ifp->if_flags &= ~IFF_UP; 3275 ifr.ifr_flags = ifp->if_flags & 0xffff; 3276 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3277 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3278 ifp->if_flags |= IFF_UP; 3279 ifr.ifr_flags = ifp->if_flags & 0xffff; 3280 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3281 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3282 } 3283 #ifdef INET 3284 /* 3285 * Also send gratuitous ARPs to notify other nodes about 3286 * the address change. 3287 */ 3288 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3289 if (ifa->ifa_addr->sa_family == AF_INET) 3290 arp_ifinit(ifp, ifa); 3291 } 3292 #endif 3293 } 3294 return (0); 3295 } 3296 3297 /* 3298 * The name argument must be a pointer to storage which will last as 3299 * long as the interface does. For physical devices, the result of 3300 * device_get_name(dev) is a good choice and for pseudo-devices a 3301 * static string works well. 3302 */ 3303 void 3304 if_initname(struct ifnet *ifp, const char *name, int unit) 3305 { 3306 ifp->if_dname = name; 3307 ifp->if_dunit = unit; 3308 if (unit != IF_DUNIT_NONE) 3309 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3310 else 3311 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3312 } 3313 3314 int 3315 if_printf(struct ifnet *ifp, const char * fmt, ...) 3316 { 3317 va_list ap; 3318 int retval; 3319 3320 retval = printf("%s: ", ifp->if_xname); 3321 va_start(ap, fmt); 3322 retval += vprintf(fmt, ap); 3323 va_end(ap); 3324 return (retval); 3325 } 3326 3327 void 3328 if_start(struct ifnet *ifp) 3329 { 3330 3331 (*(ifp)->if_start)(ifp); 3332 } 3333 3334 /* 3335 * Backwards compatibility interface for drivers 3336 * that have not implemented it 3337 */ 3338 static int 3339 if_transmit(struct ifnet *ifp, struct mbuf *m) 3340 { 3341 int error; 3342 3343 IFQ_HANDOFF(ifp, m, error); 3344 return (error); 3345 } 3346 3347 int 3348 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3349 { 3350 int active = 0; 3351 3352 IF_LOCK(ifq); 3353 if (_IF_QFULL(ifq)) { 3354 _IF_DROP(ifq); 3355 IF_UNLOCK(ifq); 3356 m_freem(m); 3357 return (0); 3358 } 3359 if (ifp != NULL) { 3360 ifp->if_obytes += m->m_pkthdr.len + adjust; 3361 if (m->m_flags & (M_BCAST|M_MCAST)) 3362 ifp->if_omcasts++; 3363 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3364 } 3365 _IF_ENQUEUE(ifq, m); 3366 IF_UNLOCK(ifq); 3367 if (ifp != NULL && !active) 3368 (*(ifp)->if_start)(ifp); 3369 return (1); 3370 } 3371 3372 void 3373 if_register_com_alloc(u_char type, 3374 if_com_alloc_t *a, if_com_free_t *f) 3375 { 3376 3377 KASSERT(if_com_alloc[type] == NULL, 3378 ("if_register_com_alloc: %d already registered", type)); 3379 KASSERT(if_com_free[type] == NULL, 3380 ("if_register_com_alloc: %d free already registered", type)); 3381 3382 if_com_alloc[type] = a; 3383 if_com_free[type] = f; 3384 } 3385 3386 void 3387 if_deregister_com_alloc(u_char type) 3388 { 3389 3390 KASSERT(if_com_alloc[type] != NULL, 3391 ("if_deregister_com_alloc: %d not registered", type)); 3392 KASSERT(if_com_free[type] != NULL, 3393 ("if_deregister_com_alloc: %d free not registered", type)); 3394 if_com_alloc[type] = NULL; 3395 if_com_free[type] = NULL; 3396 } 3397