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/bpf.h> 67 #include <net/ethernet.h> 68 #include <net/if.h> 69 #include <net/if_arp.h> 70 #include <net/if_clone.h> 71 #include <net/if_dl.h> 72 #include <net/if_types.h> 73 #include <net/if_var.h> 74 #include <net/if_media.h> 75 #include <net/if_vlan_var.h> 76 #include <net/radix.h> 77 #include <net/route.h> 78 #include <net/vnet.h> 79 80 #if defined(INET) || defined(INET6) 81 #include <net/ethernet.h> 82 #include <netinet/in.h> 83 #include <netinet/in_var.h> 84 #include <netinet/ip.h> 85 #include <netinet/ip_carp.h> 86 #ifdef INET 87 #include <netinet/if_ether.h> 88 #endif /* INET */ 89 #ifdef INET6 90 #include <netinet6/in6_var.h> 91 #include <netinet6/in6_ifattach.h> 92 #endif /* INET6 */ 93 #endif /* INET || INET6 */ 94 95 #include <security/mac/mac_framework.h> 96 97 #ifdef COMPAT_FREEBSD32 98 #include <sys/mount.h> 99 #include <compat/freebsd32/freebsd32.h> 100 #endif 101 102 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers"); 103 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management"); 104 105 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_grow(void); 163 static void if_input_default(struct ifnet *, struct mbuf *); 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, struct if_clone *); 177 static void if_detach_internal(struct ifnet *, int, struct if_clone **); 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 ifnet **, 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 RW_SYSINIT_FLAGS(ifnet_rw, &ifnet_rwlock, "ifnet_rw", RW_RECURSE); 211 struct sx ifnet_sxlock; 212 SX_SYSINIT_FLAGS(ifnet_sx, &ifnet_sxlock, "ifnet_sx", SX_RECURSE); 213 214 /* 215 * The allocation of network interfaces is a rather non-atomic affair; we 216 * need to select an index before we are ready to expose the interface for 217 * use, so will use this pointer value to indicate reservation. 218 */ 219 #define IFNET_HOLD (void *)(uintptr_t)(-1) 220 221 static if_com_alloc_t *if_com_alloc[256]; 222 static if_com_free_t *if_com_free[256]; 223 224 static MALLOC_DEFINE(M_IFNET, "ifnet", "interface internals"); 225 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address"); 226 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address"); 227 228 struct ifnet * 229 ifnet_byindex_locked(u_short idx) 230 { 231 232 if (idx > V_if_index) 233 return (NULL); 234 if (V_ifindex_table[idx] == IFNET_HOLD) 235 return (NULL); 236 return (V_ifindex_table[idx]); 237 } 238 239 struct ifnet * 240 ifnet_byindex(u_short idx) 241 { 242 struct ifnet *ifp; 243 244 IFNET_RLOCK_NOSLEEP(); 245 ifp = ifnet_byindex_locked(idx); 246 IFNET_RUNLOCK_NOSLEEP(); 247 return (ifp); 248 } 249 250 struct ifnet * 251 ifnet_byindex_ref(u_short idx) 252 { 253 struct ifnet *ifp; 254 255 IFNET_RLOCK_NOSLEEP(); 256 ifp = ifnet_byindex_locked(idx); 257 if (ifp == NULL || (ifp->if_flags & IFF_DYING)) { 258 IFNET_RUNLOCK_NOSLEEP(); 259 return (NULL); 260 } 261 if_ref(ifp); 262 IFNET_RUNLOCK_NOSLEEP(); 263 return (ifp); 264 } 265 266 /* 267 * Allocate an ifindex array entry; return 0 on success or an error on 268 * failure. 269 */ 270 static u_short 271 ifindex_alloc(void) 272 { 273 u_short idx; 274 275 IFNET_WLOCK_ASSERT(); 276 retry: 277 /* 278 * Try to find an empty slot below V_if_index. If we fail, take the 279 * next slot. 280 */ 281 for (idx = 1; idx <= V_if_index; idx++) { 282 if (V_ifindex_table[idx] == NULL) 283 break; 284 } 285 286 /* Catch if_index overflow. */ 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 return (idx); 294 } 295 296 static void 297 ifindex_free_locked(u_short idx) 298 { 299 300 IFNET_WLOCK_ASSERT(); 301 302 V_ifindex_table[idx] = NULL; 303 while (V_if_index > 0 && 304 V_ifindex_table[V_if_index] == NULL) 305 V_if_index--; 306 } 307 308 static void 309 ifindex_free(u_short idx) 310 { 311 312 IFNET_WLOCK(); 313 ifindex_free_locked(idx); 314 IFNET_WUNLOCK(); 315 } 316 317 static void 318 ifnet_setbyindex_locked(u_short idx, struct ifnet *ifp) 319 { 320 321 IFNET_WLOCK_ASSERT(); 322 323 V_ifindex_table[idx] = ifp; 324 } 325 326 static void 327 ifnet_setbyindex(u_short idx, struct ifnet *ifp) 328 { 329 330 IFNET_WLOCK(); 331 ifnet_setbyindex_locked(idx, ifp); 332 IFNET_WUNLOCK(); 333 } 334 335 struct ifaddr * 336 ifaddr_byindex(u_short idx) 337 { 338 struct ifaddr *ifa; 339 340 IFNET_RLOCK_NOSLEEP(); 341 ifa = ifnet_byindex_locked(idx)->if_addr; 342 if (ifa != NULL) 343 ifa_ref(ifa); 344 IFNET_RUNLOCK_NOSLEEP(); 345 return (ifa); 346 } 347 348 /* 349 * Network interface utility routines. 350 * 351 * Routines with ifa_ifwith* names take sockaddr *'s as 352 * parameters. 353 */ 354 355 static void 356 vnet_if_init(const void *unused __unused) 357 { 358 359 TAILQ_INIT(&V_ifnet); 360 TAILQ_INIT(&V_ifg_head); 361 IFNET_WLOCK(); 362 if_grow(); /* create initial table */ 363 IFNET_WUNLOCK(); 364 vnet_if_clone_init(); 365 } 366 VNET_SYSINIT(vnet_if_init, SI_SUB_INIT_IF, SI_ORDER_SECOND, vnet_if_init, 367 NULL); 368 369 #ifdef VIMAGE 370 static void 371 vnet_if_uninit(const void *unused __unused) 372 { 373 374 VNET_ASSERT(TAILQ_EMPTY(&V_ifnet), ("%s:%d tailq &V_ifnet=%p " 375 "not empty", __func__, __LINE__, &V_ifnet)); 376 VNET_ASSERT(TAILQ_EMPTY(&V_ifg_head), ("%s:%d tailq &V_ifg_head=%p " 377 "not empty", __func__, __LINE__, &V_ifg_head)); 378 379 free((caddr_t)V_ifindex_table, M_IFNET); 380 } 381 VNET_SYSUNINIT(vnet_if_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST, 382 vnet_if_uninit, NULL); 383 #endif 384 385 static void 386 if_grow(void) 387 { 388 int oldlim; 389 u_int n; 390 struct ifnet **e; 391 392 IFNET_WLOCK_ASSERT(); 393 oldlim = V_if_indexlim; 394 IFNET_WUNLOCK(); 395 n = (oldlim << 1) * sizeof(*e); 396 e = malloc(n, M_IFNET, M_WAITOK | M_ZERO); 397 IFNET_WLOCK(); 398 if (V_if_indexlim != oldlim) { 399 free(e, M_IFNET); 400 return; 401 } 402 if (V_ifindex_table != NULL) { 403 memcpy((caddr_t)e, (caddr_t)V_ifindex_table, n/2); 404 free((caddr_t)V_ifindex_table, M_IFNET); 405 } 406 V_if_indexlim <<= 1; 407 V_ifindex_table = e; 408 } 409 410 /* 411 * Allocate a struct ifnet and an index for an interface. A layer 2 412 * common structure will also be allocated if an allocation routine is 413 * registered for the passed type. 414 */ 415 struct ifnet * 416 if_alloc(u_char type) 417 { 418 struct ifnet *ifp; 419 u_short idx; 420 421 ifp = malloc(sizeof(struct ifnet), M_IFNET, M_WAITOK|M_ZERO); 422 IFNET_WLOCK(); 423 idx = ifindex_alloc(); 424 ifnet_setbyindex_locked(idx, IFNET_HOLD); 425 IFNET_WUNLOCK(); 426 ifp->if_index = idx; 427 ifp->if_type = type; 428 ifp->if_alloctype = type; 429 if (if_com_alloc[type] != NULL) { 430 ifp->if_l2com = if_com_alloc[type](type, ifp); 431 if (ifp->if_l2com == NULL) { 432 free(ifp, M_IFNET); 433 ifindex_free(idx); 434 return (NULL); 435 } 436 } 437 438 IF_ADDR_LOCK_INIT(ifp); 439 TASK_INIT(&ifp->if_linktask, 0, do_link_state_change, ifp); 440 ifp->if_afdata_initialized = 0; 441 IF_AFDATA_LOCK_INIT(ifp); 442 TAILQ_INIT(&ifp->if_addrhead); 443 TAILQ_INIT(&ifp->if_multiaddrs); 444 TAILQ_INIT(&ifp->if_groups); 445 #ifdef MAC 446 mac_ifnet_init(ifp); 447 #endif 448 ifq_init(&ifp->if_snd, ifp); 449 450 refcount_init(&ifp->if_refcount, 1); /* Index reference. */ 451 for (int i = 0; i < IFCOUNTERS; i++) 452 ifp->if_counters[i] = counter_u64_alloc(M_WAITOK); 453 ifp->if_get_counter = if_get_counter_default; 454 ifnet_setbyindex(ifp->if_index, ifp); 455 return (ifp); 456 } 457 458 /* 459 * Do the actual work of freeing a struct ifnet, and layer 2 common 460 * structure. This call is made when the last reference to an 461 * interface is released. 462 */ 463 static void 464 if_free_internal(struct ifnet *ifp) 465 { 466 467 KASSERT((ifp->if_flags & IFF_DYING), 468 ("if_free_internal: interface not dying")); 469 470 if (if_com_free[ifp->if_alloctype] != NULL) 471 if_com_free[ifp->if_alloctype](ifp->if_l2com, 472 ifp->if_alloctype); 473 474 #ifdef MAC 475 mac_ifnet_destroy(ifp); 476 #endif /* MAC */ 477 if (ifp->if_description != NULL) 478 free(ifp->if_description, M_IFDESCR); 479 IF_AFDATA_DESTROY(ifp); 480 IF_ADDR_LOCK_DESTROY(ifp); 481 ifq_delete(&ifp->if_snd); 482 483 for (int i = 0; i < IFCOUNTERS; i++) 484 counter_u64_free(ifp->if_counters[i]); 485 486 free(ifp, M_IFNET); 487 } 488 489 /* 490 * Deregister an interface and free the associated storage. 491 */ 492 void 493 if_free(struct ifnet *ifp) 494 { 495 496 ifp->if_flags |= IFF_DYING; /* XXX: Locking */ 497 498 CURVNET_SET_QUIET(ifp->if_vnet); 499 IFNET_WLOCK(); 500 KASSERT(ifp == ifnet_byindex_locked(ifp->if_index), 501 ("%s: freeing unallocated ifnet", ifp->if_xname)); 502 503 ifindex_free_locked(ifp->if_index); 504 IFNET_WUNLOCK(); 505 506 if (refcount_release(&ifp->if_refcount)) 507 if_free_internal(ifp); 508 CURVNET_RESTORE(); 509 } 510 511 /* 512 * Interfaces to keep an ifnet type-stable despite the possibility of the 513 * driver calling if_free(). If there are additional references, we defer 514 * freeing the underlying data structure. 515 */ 516 void 517 if_ref(struct ifnet *ifp) 518 { 519 520 /* We don't assert the ifnet list lock here, but arguably should. */ 521 refcount_acquire(&ifp->if_refcount); 522 } 523 524 void 525 if_rele(struct ifnet *ifp) 526 { 527 528 if (!refcount_release(&ifp->if_refcount)) 529 return; 530 if_free_internal(ifp); 531 } 532 533 void 534 ifq_init(struct ifaltq *ifq, struct ifnet *ifp) 535 { 536 537 mtx_init(&ifq->ifq_mtx, ifp->if_xname, "if send queue", MTX_DEF); 538 539 if (ifq->ifq_maxlen == 0) 540 ifq->ifq_maxlen = ifqmaxlen; 541 542 ifq->altq_type = 0; 543 ifq->altq_disc = NULL; 544 ifq->altq_flags &= ALTQF_CANTCHANGE; 545 ifq->altq_tbr = NULL; 546 ifq->altq_ifp = ifp; 547 } 548 549 void 550 ifq_delete(struct ifaltq *ifq) 551 { 552 mtx_destroy(&ifq->ifq_mtx); 553 } 554 555 /* 556 * Perform generic interface initalization tasks and attach the interface 557 * to the list of "active" interfaces. If vmove flag is set on entry 558 * to if_attach_internal(), perform only a limited subset of initialization 559 * tasks, given that we are moving from one vnet to another an ifnet which 560 * has already been fully initialized. 561 * 562 * Note that if_detach_internal() removes group membership unconditionally 563 * even when vmove flag is set, and if_attach_internal() adds only IFG_ALL. 564 * Thus, when if_vmove() is applied to a cloned interface, group membership 565 * is lost while a cloned one always joins a group whose name is 566 * ifc->ifc_name. To recover this after if_detach_internal() and 567 * if_attach_internal(), the cloner should be specified to 568 * if_attach_internal() via ifc. If it is non-NULL, if_attach_internal() 569 * attempts to join a group whose name is ifc->ifc_name. 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, NULL); 582 } 583 584 /* 585 * Compute the least common TSO limit. 586 */ 587 void 588 if_hw_tsomax_common(if_t ifp, struct ifnet_hw_tsomax *pmax) 589 { 590 /* 591 * 1) If there is no limit currently, take the limit from 592 * the network adapter. 593 * 594 * 2) If the network adapter has a limit below the current 595 * limit, apply it. 596 */ 597 if (pmax->tsomaxbytes == 0 || (ifp->if_hw_tsomax != 0 && 598 ifp->if_hw_tsomax < pmax->tsomaxbytes)) { 599 pmax->tsomaxbytes = ifp->if_hw_tsomax; 600 } 601 if (pmax->tsomaxsegcount == 0 || (ifp->if_hw_tsomaxsegcount != 0 && 602 ifp->if_hw_tsomaxsegcount < pmax->tsomaxsegcount)) { 603 pmax->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 604 } 605 if (pmax->tsomaxsegsize == 0 || (ifp->if_hw_tsomaxsegsize != 0 && 606 ifp->if_hw_tsomaxsegsize < pmax->tsomaxsegsize)) { 607 pmax->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 608 } 609 } 610 611 /* 612 * Update TSO limit of a network adapter. 613 * 614 * Returns zero if no change. Else non-zero. 615 */ 616 int 617 if_hw_tsomax_update(if_t ifp, struct ifnet_hw_tsomax *pmax) 618 { 619 int retval = 0; 620 if (ifp->if_hw_tsomax != pmax->tsomaxbytes) { 621 ifp->if_hw_tsomax = pmax->tsomaxbytes; 622 retval++; 623 } 624 if (ifp->if_hw_tsomaxsegsize != pmax->tsomaxsegsize) { 625 ifp->if_hw_tsomaxsegsize = pmax->tsomaxsegsize; 626 retval++; 627 } 628 if (ifp->if_hw_tsomaxsegcount != pmax->tsomaxsegcount) { 629 ifp->if_hw_tsomaxsegcount = pmax->tsomaxsegcount; 630 retval++; 631 } 632 return (retval); 633 } 634 635 static void 636 if_attach_internal(struct ifnet *ifp, int vmove, struct if_clone *ifc) 637 { 638 unsigned socksize, ifasize; 639 int namelen, masklen; 640 struct sockaddr_dl *sdl; 641 struct ifaddr *ifa; 642 643 if (ifp->if_index == 0 || ifp != ifnet_byindex(ifp->if_index)) 644 panic ("%s: BUG: if_attach called without if_alloc'd input()\n", 645 ifp->if_xname); 646 647 #ifdef VIMAGE 648 ifp->if_vnet = curvnet; 649 if (ifp->if_home_vnet == NULL) 650 ifp->if_home_vnet = curvnet; 651 #endif 652 653 if_addgroup(ifp, IFG_ALL); 654 655 /* Restore group membership for cloned interfaces. */ 656 if (vmove && ifc != NULL) 657 if_clone_addgroup(ifp, ifc); 658 659 getmicrotime(&ifp->if_lastchange); 660 ifp->if_epoch = time_uptime; 661 662 KASSERT((ifp->if_transmit == NULL && ifp->if_qflush == NULL) || 663 (ifp->if_transmit != NULL && ifp->if_qflush != NULL), 664 ("transmit and qflush must both either be set or both be NULL")); 665 if (ifp->if_transmit == NULL) { 666 ifp->if_transmit = if_transmit; 667 ifp->if_qflush = if_qflush; 668 } 669 if (ifp->if_input == NULL) 670 ifp->if_input = if_input_default; 671 672 if (!vmove) { 673 #ifdef MAC 674 mac_ifnet_create(ifp); 675 #endif 676 677 /* 678 * Create a Link Level name for this device. 679 */ 680 namelen = strlen(ifp->if_xname); 681 /* 682 * Always save enough space for any possiable name so we 683 * can do a rename in place later. 684 */ 685 masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + IFNAMSIZ; 686 socksize = masklen + ifp->if_addrlen; 687 if (socksize < sizeof(*sdl)) 688 socksize = sizeof(*sdl); 689 socksize = roundup2(socksize, sizeof(long)); 690 ifasize = sizeof(*ifa) + 2 * socksize; 691 ifa = ifa_alloc(ifasize, M_WAITOK); 692 sdl = (struct sockaddr_dl *)(ifa + 1); 693 sdl->sdl_len = socksize; 694 sdl->sdl_family = AF_LINK; 695 bcopy(ifp->if_xname, sdl->sdl_data, namelen); 696 sdl->sdl_nlen = namelen; 697 sdl->sdl_index = ifp->if_index; 698 sdl->sdl_type = ifp->if_type; 699 ifp->if_addr = ifa; 700 ifa->ifa_ifp = ifp; 701 ifa->ifa_rtrequest = link_rtrequest; 702 ifa->ifa_addr = (struct sockaddr *)sdl; 703 sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl); 704 ifa->ifa_netmask = (struct sockaddr *)sdl; 705 sdl->sdl_len = masklen; 706 while (namelen != 0) 707 sdl->sdl_data[--namelen] = 0xff; 708 TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link); 709 /* Reliably crash if used uninitialized. */ 710 ifp->if_broadcastaddr = NULL; 711 712 #if defined(INET) || defined(INET6) 713 /* Use defaults for TSO, if nothing is set */ 714 if (ifp->if_hw_tsomax == 0 && 715 ifp->if_hw_tsomaxsegcount == 0 && 716 ifp->if_hw_tsomaxsegsize == 0) { 717 /* 718 * The TSO defaults needs to be such that an 719 * NFS mbuf list of 35 mbufs totalling just 720 * below 64K works and that a chain of mbufs 721 * can be defragged into at most 32 segments: 722 */ 723 ifp->if_hw_tsomax = min(IP_MAXPACKET, (32 * MCLBYTES) - 724 (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN)); 725 ifp->if_hw_tsomaxsegcount = 35; 726 ifp->if_hw_tsomaxsegsize = 2048; /* 2K */ 727 728 /* XXX some drivers set IFCAP_TSO after ethernet attach */ 729 if (ifp->if_capabilities & IFCAP_TSO) { 730 if_printf(ifp, "Using defaults for TSO: %u/%u/%u\n", 731 ifp->if_hw_tsomax, 732 ifp->if_hw_tsomaxsegcount, 733 ifp->if_hw_tsomaxsegsize); 734 } 735 } 736 #endif 737 } 738 #ifdef VIMAGE 739 else { 740 /* 741 * Update the interface index in the link layer address 742 * of the interface. 743 */ 744 for (ifa = ifp->if_addr; ifa != NULL; 745 ifa = TAILQ_NEXT(ifa, ifa_link)) { 746 if (ifa->ifa_addr->sa_family == AF_LINK) { 747 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 748 sdl->sdl_index = ifp->if_index; 749 } 750 } 751 } 752 #endif 753 754 IFNET_WLOCK(); 755 TAILQ_INSERT_TAIL(&V_ifnet, ifp, if_link); 756 #ifdef VIMAGE 757 curvnet->vnet_ifcnt++; 758 #endif 759 IFNET_WUNLOCK(); 760 761 if (domain_init_status >= 2) 762 if_attachdomain1(ifp); 763 764 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 765 if (IS_DEFAULT_VNET(curvnet)) 766 devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL); 767 768 /* Announce the interface. */ 769 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 770 } 771 772 static void 773 if_attachdomain(void *dummy) 774 { 775 struct ifnet *ifp; 776 777 TAILQ_FOREACH(ifp, &V_ifnet, if_link) 778 if_attachdomain1(ifp); 779 } 780 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_SECOND, 781 if_attachdomain, NULL); 782 783 static void 784 if_attachdomain1(struct ifnet *ifp) 785 { 786 struct domain *dp; 787 788 /* 789 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we 790 * cannot lock ifp->if_afdata initialization, entirely. 791 */ 792 if (IF_AFDATA_TRYLOCK(ifp) == 0) 793 return; 794 if (ifp->if_afdata_initialized >= domain_init_status) { 795 IF_AFDATA_UNLOCK(ifp); 796 log(LOG_WARNING, "%s called more than once on %s\n", 797 __func__, ifp->if_xname); 798 return; 799 } 800 ifp->if_afdata_initialized = domain_init_status; 801 IF_AFDATA_UNLOCK(ifp); 802 803 /* address family dependent data region */ 804 bzero(ifp->if_afdata, sizeof(ifp->if_afdata)); 805 for (dp = domains; dp; dp = dp->dom_next) { 806 if (dp->dom_ifattach) 807 ifp->if_afdata[dp->dom_family] = 808 (*dp->dom_ifattach)(ifp); 809 } 810 } 811 812 /* 813 * Remove any unicast or broadcast network addresses from an interface. 814 */ 815 void 816 if_purgeaddrs(struct ifnet *ifp) 817 { 818 struct ifaddr *ifa, *next; 819 820 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 821 if (ifa->ifa_addr->sa_family == AF_LINK) 822 continue; 823 #ifdef INET 824 /* XXX: Ugly!! ad hoc just for INET */ 825 if (ifa->ifa_addr->sa_family == AF_INET) { 826 struct ifaliasreq ifr; 827 828 bzero(&ifr, sizeof(ifr)); 829 ifr.ifra_addr = *ifa->ifa_addr; 830 if (ifa->ifa_dstaddr) 831 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 832 if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp, 833 NULL) == 0) 834 continue; 835 } 836 #endif /* INET */ 837 #ifdef INET6 838 if (ifa->ifa_addr->sa_family == AF_INET6) { 839 in6_purgeaddr(ifa); 840 /* ifp_addrhead is already updated */ 841 continue; 842 } 843 #endif /* INET6 */ 844 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 845 ifa_free(ifa); 846 } 847 } 848 849 /* 850 * Remove any multicast network addresses from an interface when an ifnet 851 * is going away. 852 */ 853 static void 854 if_purgemaddrs(struct ifnet *ifp) 855 { 856 struct ifmultiaddr *ifma; 857 struct ifmultiaddr *next; 858 859 IF_ADDR_WLOCK(ifp); 860 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 861 if_delmulti_locked(ifp, ifma, 1); 862 IF_ADDR_WUNLOCK(ifp); 863 } 864 865 /* 866 * Detach an interface, removing it from the list of "active" interfaces. 867 * If vmove flag is set on entry to if_detach_internal(), perform only a 868 * limited subset of cleanup tasks, given that we are moving an ifnet from 869 * one vnet to another, where it must be fully operational. 870 * 871 * XXXRW: There are some significant questions about event ordering, and 872 * how to prevent things from starting to use the interface during detach. 873 */ 874 void 875 if_detach(struct ifnet *ifp) 876 { 877 878 CURVNET_SET_QUIET(ifp->if_vnet); 879 if_detach_internal(ifp, 0, NULL); 880 CURVNET_RESTORE(); 881 } 882 883 static void 884 if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp) 885 { 886 struct ifaddr *ifa; 887 struct radix_node_head *rnh; 888 int i, j; 889 struct domain *dp; 890 struct ifnet *iter; 891 int found = 0; 892 893 IFNET_WLOCK(); 894 TAILQ_FOREACH(iter, &V_ifnet, if_link) 895 if (iter == ifp) { 896 TAILQ_REMOVE(&V_ifnet, ifp, if_link); 897 found = 1; 898 break; 899 } 900 #ifdef VIMAGE 901 if (found) 902 curvnet->vnet_ifcnt--; 903 #endif 904 IFNET_WUNLOCK(); 905 if (!found) { 906 if (vmove) 907 panic("%s: ifp=%p not on the ifnet tailq %p", 908 __func__, ifp, &V_ifnet); 909 else 910 return; /* XXX this should panic as well? */ 911 } 912 913 /* Check if this is a cloned interface or not. */ 914 if (vmove && ifcp != NULL) 915 *ifcp = if_clone_findifc(ifp); 916 917 /* 918 * Remove/wait for pending events. 919 */ 920 taskqueue_drain(taskqueue_swi, &ifp->if_linktask); 921 922 /* 923 * Remove routes and flush queues. 924 */ 925 if_down(ifp); 926 #ifdef ALTQ 927 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 928 altq_disable(&ifp->if_snd); 929 if (ALTQ_IS_ATTACHED(&ifp->if_snd)) 930 altq_detach(&ifp->if_snd); 931 #endif 932 933 if_purgeaddrs(ifp); 934 935 #ifdef INET 936 in_ifdetach(ifp); 937 #endif 938 939 #ifdef INET6 940 /* 941 * Remove all IPv6 kernel structs related to ifp. This should be done 942 * before removing routing entries below, since IPv6 interface direct 943 * routes are expected to be removed by the IPv6-specific kernel API. 944 * Otherwise, the kernel will detect some inconsistency and bark it. 945 */ 946 in6_ifdetach(ifp); 947 #endif 948 if_purgemaddrs(ifp); 949 950 /* Announce that the interface is gone. */ 951 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 952 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 953 if (IS_DEFAULT_VNET(curvnet)) 954 devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL); 955 956 if (!vmove) { 957 /* 958 * Prevent further calls into the device driver via ifnet. 959 */ 960 if_dead(ifp); 961 962 /* 963 * Remove link ifaddr pointer and maybe decrement if_index. 964 * Clean up all addresses. 965 */ 966 ifp->if_addr = NULL; 967 968 /* We can now free link ifaddr. */ 969 if (!TAILQ_EMPTY(&ifp->if_addrhead)) { 970 ifa = TAILQ_FIRST(&ifp->if_addrhead); 971 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 972 ifa_free(ifa); 973 } 974 } 975 976 /* 977 * Delete all remaining routes using this interface 978 * Unfortuneatly the only way to do this is to slog through 979 * the entire routing table looking for routes which point 980 * to this interface...oh well... 981 */ 982 for (i = 1; i <= AF_MAX; i++) { 983 for (j = 0; j < rt_numfibs; j++) { 984 rnh = rt_tables_get_rnh(j, i); 985 if (rnh == NULL) 986 continue; 987 RADIX_NODE_HEAD_LOCK(rnh); 988 (void) rnh->rnh_walktree(rnh, if_rtdel, ifp); 989 RADIX_NODE_HEAD_UNLOCK(rnh); 990 } 991 } 992 993 if_delgroups(ifp); 994 995 /* 996 * We cannot hold the lock over dom_ifdetach calls as they might 997 * sleep, for example trying to drain a callout, thus open up the 998 * theoretical race with re-attaching. 999 */ 1000 IF_AFDATA_LOCK(ifp); 1001 i = ifp->if_afdata_initialized; 1002 ifp->if_afdata_initialized = 0; 1003 IF_AFDATA_UNLOCK(ifp); 1004 for (dp = domains; i > 0 && dp; dp = dp->dom_next) { 1005 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family]) 1006 (*dp->dom_ifdetach)(ifp, 1007 ifp->if_afdata[dp->dom_family]); 1008 } 1009 } 1010 1011 #ifdef VIMAGE 1012 /* 1013 * if_vmove() performs a limited version of if_detach() in current 1014 * vnet and if_attach()es the ifnet to the vnet specified as 2nd arg. 1015 * An attempt is made to shrink if_index in current vnet, find an 1016 * unused if_index in target vnet and calls if_grow() if necessary, 1017 * and finally find an unused if_xname for the target vnet. 1018 */ 1019 void 1020 if_vmove(struct ifnet *ifp, struct vnet *new_vnet) 1021 { 1022 struct if_clone *ifc; 1023 1024 /* 1025 * Detach from current vnet, but preserve LLADDR info, do not 1026 * mark as dead etc. so that the ifnet can be reattached later. 1027 */ 1028 if_detach_internal(ifp, 1, &ifc); 1029 1030 /* 1031 * Unlink the ifnet from ifindex_table[] in current vnet, and shrink 1032 * the if_index for that vnet if possible. 1033 * 1034 * NOTE: IFNET_WLOCK/IFNET_WUNLOCK() are assumed to be unvirtualized, 1035 * or we'd lock on one vnet and unlock on another. 1036 */ 1037 IFNET_WLOCK(); 1038 ifindex_free_locked(ifp->if_index); 1039 IFNET_WUNLOCK(); 1040 1041 /* 1042 * Perform interface-specific reassignment tasks, if provided by 1043 * the driver. 1044 */ 1045 if (ifp->if_reassign != NULL) 1046 ifp->if_reassign(ifp, new_vnet, NULL); 1047 1048 /* 1049 * Switch to the context of the target vnet. 1050 */ 1051 CURVNET_SET_QUIET(new_vnet); 1052 1053 IFNET_WLOCK(); 1054 ifp->if_index = ifindex_alloc(); 1055 ifnet_setbyindex_locked(ifp->if_index, ifp); 1056 IFNET_WUNLOCK(); 1057 1058 if_attach_internal(ifp, 1, ifc); 1059 1060 CURVNET_RESTORE(); 1061 } 1062 1063 /* 1064 * Move an ifnet to or from another child prison/vnet, specified by the jail id. 1065 */ 1066 static int 1067 if_vmove_loan(struct thread *td, struct ifnet *ifp, char *ifname, int jid) 1068 { 1069 struct prison *pr; 1070 struct ifnet *difp; 1071 1072 /* Try to find the prison within our visibility. */ 1073 sx_slock(&allprison_lock); 1074 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1075 sx_sunlock(&allprison_lock); 1076 if (pr == NULL) 1077 return (ENXIO); 1078 prison_hold_locked(pr); 1079 mtx_unlock(&pr->pr_mtx); 1080 1081 /* Do not try to move the iface from and to the same prison. */ 1082 if (pr->pr_vnet == ifp->if_vnet) { 1083 prison_free(pr); 1084 return (EEXIST); 1085 } 1086 1087 /* Make sure the named iface does not exists in the dst. prison/vnet. */ 1088 /* XXX Lock interfaces to avoid races. */ 1089 CURVNET_SET_QUIET(pr->pr_vnet); 1090 difp = ifunit(ifname); 1091 CURVNET_RESTORE(); 1092 if (difp != NULL) { 1093 prison_free(pr); 1094 return (EEXIST); 1095 } 1096 1097 /* Move the interface into the child jail/vnet. */ 1098 if_vmove(ifp, pr->pr_vnet); 1099 1100 /* Report the new if_xname back to the userland. */ 1101 sprintf(ifname, "%s", ifp->if_xname); 1102 1103 prison_free(pr); 1104 return (0); 1105 } 1106 1107 static int 1108 if_vmove_reclaim(struct thread *td, char *ifname, int jid) 1109 { 1110 struct prison *pr; 1111 struct vnet *vnet_dst; 1112 struct ifnet *ifp; 1113 1114 /* Try to find the prison within our visibility. */ 1115 sx_slock(&allprison_lock); 1116 pr = prison_find_child(td->td_ucred->cr_prison, jid); 1117 sx_sunlock(&allprison_lock); 1118 if (pr == NULL) 1119 return (ENXIO); 1120 prison_hold_locked(pr); 1121 mtx_unlock(&pr->pr_mtx); 1122 1123 /* Make sure the named iface exists in the source prison/vnet. */ 1124 CURVNET_SET(pr->pr_vnet); 1125 ifp = ifunit(ifname); /* XXX Lock to avoid races. */ 1126 if (ifp == NULL) { 1127 CURVNET_RESTORE(); 1128 prison_free(pr); 1129 return (ENXIO); 1130 } 1131 1132 /* Do not try to move the iface from and to the same prison. */ 1133 vnet_dst = TD_TO_VNET(td); 1134 if (vnet_dst == ifp->if_vnet) { 1135 CURVNET_RESTORE(); 1136 prison_free(pr); 1137 return (EEXIST); 1138 } 1139 1140 /* Get interface back from child jail/vnet. */ 1141 if_vmove(ifp, vnet_dst); 1142 CURVNET_RESTORE(); 1143 1144 /* Report the new if_xname back to the userland. */ 1145 sprintf(ifname, "%s", ifp->if_xname); 1146 1147 prison_free(pr); 1148 return (0); 1149 } 1150 #endif /* VIMAGE */ 1151 1152 /* 1153 * Add a group to an interface 1154 */ 1155 int 1156 if_addgroup(struct ifnet *ifp, const char *groupname) 1157 { 1158 struct ifg_list *ifgl; 1159 struct ifg_group *ifg = NULL; 1160 struct ifg_member *ifgm; 1161 int new = 0; 1162 1163 if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' && 1164 groupname[strlen(groupname) - 1] <= '9') 1165 return (EINVAL); 1166 1167 IFNET_WLOCK(); 1168 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1169 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) { 1170 IFNET_WUNLOCK(); 1171 return (EEXIST); 1172 } 1173 1174 if ((ifgl = (struct ifg_list *)malloc(sizeof(struct ifg_list), M_TEMP, 1175 M_NOWAIT)) == NULL) { 1176 IFNET_WUNLOCK(); 1177 return (ENOMEM); 1178 } 1179 1180 if ((ifgm = (struct ifg_member *)malloc(sizeof(struct ifg_member), 1181 M_TEMP, M_NOWAIT)) == NULL) { 1182 free(ifgl, M_TEMP); 1183 IFNET_WUNLOCK(); 1184 return (ENOMEM); 1185 } 1186 1187 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1188 if (!strcmp(ifg->ifg_group, groupname)) 1189 break; 1190 1191 if (ifg == NULL) { 1192 if ((ifg = (struct ifg_group *)malloc(sizeof(struct ifg_group), 1193 M_TEMP, M_NOWAIT)) == NULL) { 1194 free(ifgl, M_TEMP); 1195 free(ifgm, M_TEMP); 1196 IFNET_WUNLOCK(); 1197 return (ENOMEM); 1198 } 1199 strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group)); 1200 ifg->ifg_refcnt = 0; 1201 TAILQ_INIT(&ifg->ifg_members); 1202 TAILQ_INSERT_TAIL(&V_ifg_head, ifg, ifg_next); 1203 new = 1; 1204 } 1205 1206 ifg->ifg_refcnt++; 1207 ifgl->ifgl_group = ifg; 1208 ifgm->ifgm_ifp = ifp; 1209 1210 IF_ADDR_WLOCK(ifp); 1211 TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next); 1212 TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next); 1213 IF_ADDR_WUNLOCK(ifp); 1214 1215 IFNET_WUNLOCK(); 1216 1217 if (new) 1218 EVENTHANDLER_INVOKE(group_attach_event, ifg); 1219 EVENTHANDLER_INVOKE(group_change_event, groupname); 1220 1221 return (0); 1222 } 1223 1224 /* 1225 * Remove a group from an interface 1226 */ 1227 int 1228 if_delgroup(struct ifnet *ifp, const char *groupname) 1229 { 1230 struct ifg_list *ifgl; 1231 struct ifg_member *ifgm; 1232 1233 IFNET_WLOCK(); 1234 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1235 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname)) 1236 break; 1237 if (ifgl == NULL) { 1238 IFNET_WUNLOCK(); 1239 return (ENOENT); 1240 } 1241 1242 IF_ADDR_WLOCK(ifp); 1243 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1244 IF_ADDR_WUNLOCK(ifp); 1245 1246 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1247 if (ifgm->ifgm_ifp == ifp) 1248 break; 1249 1250 if (ifgm != NULL) { 1251 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next); 1252 free(ifgm, M_TEMP); 1253 } 1254 1255 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1256 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1257 IFNET_WUNLOCK(); 1258 EVENTHANDLER_INVOKE(group_detach_event, ifgl->ifgl_group); 1259 free(ifgl->ifgl_group, M_TEMP); 1260 } else 1261 IFNET_WUNLOCK(); 1262 1263 free(ifgl, M_TEMP); 1264 1265 EVENTHANDLER_INVOKE(group_change_event, groupname); 1266 1267 return (0); 1268 } 1269 1270 /* 1271 * Remove an interface from all groups 1272 */ 1273 static void 1274 if_delgroups(struct ifnet *ifp) 1275 { 1276 struct ifg_list *ifgl; 1277 struct ifg_member *ifgm; 1278 char groupname[IFNAMSIZ]; 1279 1280 IFNET_WLOCK(); 1281 while (!TAILQ_EMPTY(&ifp->if_groups)) { 1282 ifgl = TAILQ_FIRST(&ifp->if_groups); 1283 1284 strlcpy(groupname, ifgl->ifgl_group->ifg_group, IFNAMSIZ); 1285 1286 IF_ADDR_WLOCK(ifp); 1287 TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next); 1288 IF_ADDR_WUNLOCK(ifp); 1289 1290 TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next) 1291 if (ifgm->ifgm_ifp == ifp) 1292 break; 1293 1294 if (ifgm != NULL) { 1295 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, 1296 ifgm_next); 1297 free(ifgm, M_TEMP); 1298 } 1299 1300 if (--ifgl->ifgl_group->ifg_refcnt == 0) { 1301 TAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_next); 1302 IFNET_WUNLOCK(); 1303 EVENTHANDLER_INVOKE(group_detach_event, 1304 ifgl->ifgl_group); 1305 free(ifgl->ifgl_group, M_TEMP); 1306 } else 1307 IFNET_WUNLOCK(); 1308 1309 free(ifgl, M_TEMP); 1310 1311 EVENTHANDLER_INVOKE(group_change_event, groupname); 1312 1313 IFNET_WLOCK(); 1314 } 1315 IFNET_WUNLOCK(); 1316 } 1317 1318 /* 1319 * Stores all groups from an interface in memory pointed 1320 * to by data 1321 */ 1322 static int 1323 if_getgroup(struct ifgroupreq *data, struct ifnet *ifp) 1324 { 1325 int len, error; 1326 struct ifg_list *ifgl; 1327 struct ifg_req ifgrq, *ifgp; 1328 struct ifgroupreq *ifgr = data; 1329 1330 if (ifgr->ifgr_len == 0) { 1331 IF_ADDR_RLOCK(ifp); 1332 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) 1333 ifgr->ifgr_len += sizeof(struct ifg_req); 1334 IF_ADDR_RUNLOCK(ifp); 1335 return (0); 1336 } 1337 1338 len = ifgr->ifgr_len; 1339 ifgp = ifgr->ifgr_groups; 1340 /* XXX: wire */ 1341 IF_ADDR_RLOCK(ifp); 1342 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) { 1343 if (len < sizeof(ifgrq)) { 1344 IF_ADDR_RUNLOCK(ifp); 1345 return (EINVAL); 1346 } 1347 bzero(&ifgrq, sizeof ifgrq); 1348 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group, 1349 sizeof(ifgrq.ifgrq_group)); 1350 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1351 IF_ADDR_RUNLOCK(ifp); 1352 return (error); 1353 } 1354 len -= sizeof(ifgrq); 1355 ifgp++; 1356 } 1357 IF_ADDR_RUNLOCK(ifp); 1358 1359 return (0); 1360 } 1361 1362 /* 1363 * Stores all members of a group in memory pointed to by data 1364 */ 1365 static int 1366 if_getgroupmembers(struct ifgroupreq *data) 1367 { 1368 struct ifgroupreq *ifgr = data; 1369 struct ifg_group *ifg; 1370 struct ifg_member *ifgm; 1371 struct ifg_req ifgrq, *ifgp; 1372 int len, error; 1373 1374 IFNET_RLOCK(); 1375 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 1376 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name)) 1377 break; 1378 if (ifg == NULL) { 1379 IFNET_RUNLOCK(); 1380 return (ENOENT); 1381 } 1382 1383 if (ifgr->ifgr_len == 0) { 1384 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) 1385 ifgr->ifgr_len += sizeof(ifgrq); 1386 IFNET_RUNLOCK(); 1387 return (0); 1388 } 1389 1390 len = ifgr->ifgr_len; 1391 ifgp = ifgr->ifgr_groups; 1392 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) { 1393 if (len < sizeof(ifgrq)) { 1394 IFNET_RUNLOCK(); 1395 return (EINVAL); 1396 } 1397 bzero(&ifgrq, sizeof ifgrq); 1398 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname, 1399 sizeof(ifgrq.ifgrq_member)); 1400 if ((error = copyout(&ifgrq, ifgp, sizeof(struct ifg_req)))) { 1401 IFNET_RUNLOCK(); 1402 return (error); 1403 } 1404 len -= sizeof(ifgrq); 1405 ifgp++; 1406 } 1407 IFNET_RUNLOCK(); 1408 1409 return (0); 1410 } 1411 1412 /* 1413 * Delete Routes for a Network Interface 1414 * 1415 * Called for each routing entry via the rnh->rnh_walktree() call above 1416 * to delete all route entries referencing a detaching network interface. 1417 * 1418 * Arguments: 1419 * rn pointer to node in the routing table 1420 * arg argument passed to rnh->rnh_walktree() - detaching interface 1421 * 1422 * Returns: 1423 * 0 successful 1424 * errno failed - reason indicated 1425 * 1426 */ 1427 static int 1428 if_rtdel(struct radix_node *rn, void *arg) 1429 { 1430 struct rtentry *rt = (struct rtentry *)rn; 1431 struct ifnet *ifp = arg; 1432 int err; 1433 1434 if (rt->rt_ifp == ifp) { 1435 1436 /* 1437 * Protect (sorta) against walktree recursion problems 1438 * with cloned routes 1439 */ 1440 if ((rt->rt_flags & RTF_UP) == 0) 1441 return (0); 1442 1443 err = rtrequest_fib(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1444 rt_mask(rt), 1445 rt->rt_flags|RTF_RNH_LOCKED|RTF_PINNED, 1446 (struct rtentry **) NULL, rt->rt_fibnum); 1447 if (err) { 1448 log(LOG_WARNING, "if_rtdel: error %d\n", err); 1449 } 1450 } 1451 1452 return (0); 1453 } 1454 1455 /* 1456 * Return counter values from counter(9)s stored in ifnet. 1457 */ 1458 uint64_t 1459 if_get_counter_default(struct ifnet *ifp, ift_counter cnt) 1460 { 1461 1462 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1463 1464 return (counter_u64_fetch(ifp->if_counters[cnt])); 1465 } 1466 1467 /* 1468 * Increase an ifnet counter. Usually used for counters shared 1469 * between the stack and a driver, but function supports them all. 1470 */ 1471 void 1472 if_inc_counter(struct ifnet *ifp, ift_counter cnt, int64_t inc) 1473 { 1474 1475 KASSERT(cnt < IFCOUNTERS, ("%s: invalid cnt %d", __func__, cnt)); 1476 1477 counter_u64_add(ifp->if_counters[cnt], inc); 1478 } 1479 1480 /* 1481 * Copy data from ifnet to userland API structure if_data. 1482 */ 1483 void 1484 if_data_copy(struct ifnet *ifp, struct if_data *ifd) 1485 { 1486 1487 ifd->ifi_type = ifp->if_type; 1488 ifd->ifi_physical = 0; 1489 ifd->ifi_addrlen = ifp->if_addrlen; 1490 ifd->ifi_hdrlen = ifp->if_hdrlen; 1491 ifd->ifi_link_state = ifp->if_link_state; 1492 ifd->ifi_vhid = 0; 1493 ifd->ifi_datalen = sizeof(struct if_data); 1494 ifd->ifi_mtu = ifp->if_mtu; 1495 ifd->ifi_metric = ifp->if_metric; 1496 ifd->ifi_baudrate = ifp->if_baudrate; 1497 ifd->ifi_hwassist = ifp->if_hwassist; 1498 ifd->ifi_epoch = ifp->if_epoch; 1499 ifd->ifi_lastchange = ifp->if_lastchange; 1500 1501 ifd->ifi_ipackets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 1502 ifd->ifi_ierrors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 1503 ifd->ifi_opackets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 1504 ifd->ifi_oerrors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 1505 ifd->ifi_collisions = ifp->if_get_counter(ifp, IFCOUNTER_COLLISIONS); 1506 ifd->ifi_ibytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 1507 ifd->ifi_obytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 1508 ifd->ifi_imcasts = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 1509 ifd->ifi_omcasts = ifp->if_get_counter(ifp, IFCOUNTER_OMCASTS); 1510 ifd->ifi_iqdrops = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 1511 ifd->ifi_oqdrops = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 1512 ifd->ifi_noproto = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 1513 } 1514 1515 /* 1516 * Wrapper functions for struct ifnet address list locking macros. These are 1517 * used by kernel modules to avoid encoding programming interface or binary 1518 * interface assumptions that may be violated when kernel-internal locking 1519 * approaches change. 1520 */ 1521 void 1522 if_addr_rlock(struct ifnet *ifp) 1523 { 1524 1525 IF_ADDR_RLOCK(ifp); 1526 } 1527 1528 void 1529 if_addr_runlock(struct ifnet *ifp) 1530 { 1531 1532 IF_ADDR_RUNLOCK(ifp); 1533 } 1534 1535 void 1536 if_maddr_rlock(if_t ifp) 1537 { 1538 1539 IF_ADDR_RLOCK((struct ifnet *)ifp); 1540 } 1541 1542 void 1543 if_maddr_runlock(if_t ifp) 1544 { 1545 1546 IF_ADDR_RUNLOCK((struct ifnet *)ifp); 1547 } 1548 1549 /* 1550 * Initialization, destruction and refcounting functions for ifaddrs. 1551 */ 1552 struct ifaddr * 1553 ifa_alloc(size_t size, int flags) 1554 { 1555 struct ifaddr *ifa; 1556 1557 KASSERT(size >= sizeof(struct ifaddr), 1558 ("%s: invalid size %zu", __func__, size)); 1559 1560 ifa = malloc(size, M_IFADDR, M_ZERO | flags); 1561 if (ifa == NULL) 1562 return (NULL); 1563 1564 if ((ifa->ifa_opackets = counter_u64_alloc(flags)) == NULL) 1565 goto fail; 1566 if ((ifa->ifa_ipackets = counter_u64_alloc(flags)) == NULL) 1567 goto fail; 1568 if ((ifa->ifa_obytes = counter_u64_alloc(flags)) == NULL) 1569 goto fail; 1570 if ((ifa->ifa_ibytes = counter_u64_alloc(flags)) == NULL) 1571 goto fail; 1572 1573 refcount_init(&ifa->ifa_refcnt, 1); 1574 1575 return (ifa); 1576 1577 fail: 1578 /* free(NULL) is okay */ 1579 counter_u64_free(ifa->ifa_opackets); 1580 counter_u64_free(ifa->ifa_ipackets); 1581 counter_u64_free(ifa->ifa_obytes); 1582 counter_u64_free(ifa->ifa_ibytes); 1583 free(ifa, M_IFADDR); 1584 1585 return (NULL); 1586 } 1587 1588 void 1589 ifa_ref(struct ifaddr *ifa) 1590 { 1591 1592 refcount_acquire(&ifa->ifa_refcnt); 1593 } 1594 1595 void 1596 ifa_free(struct ifaddr *ifa) 1597 { 1598 1599 if (refcount_release(&ifa->ifa_refcnt)) { 1600 counter_u64_free(ifa->ifa_opackets); 1601 counter_u64_free(ifa->ifa_ipackets); 1602 counter_u64_free(ifa->ifa_obytes); 1603 counter_u64_free(ifa->ifa_ibytes); 1604 free(ifa, M_IFADDR); 1605 } 1606 } 1607 1608 int 1609 ifa_add_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1610 { 1611 int error = 0; 1612 struct rtentry *rt = NULL; 1613 struct rt_addrinfo info; 1614 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1615 1616 bzero(&info, sizeof(info)); 1617 info.rti_ifp = V_loif; 1618 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1619 info.rti_info[RTAX_DST] = ia; 1620 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1621 error = rtrequest1_fib(RTM_ADD, &info, &rt, ifa->ifa_ifp->if_fib); 1622 1623 if (error == 0 && rt != NULL) { 1624 RT_LOCK(rt); 1625 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1626 ifa->ifa_ifp->if_type; 1627 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1628 ifa->ifa_ifp->if_index; 1629 RT_REMREF(rt); 1630 RT_UNLOCK(rt); 1631 } else if (error != 0) 1632 log(LOG_DEBUG, "%s: insertion failed: %u\n", __func__, error); 1633 1634 return (error); 1635 } 1636 1637 int 1638 ifa_del_loopback_route(struct ifaddr *ifa, struct sockaddr *ia) 1639 { 1640 int error = 0; 1641 struct rt_addrinfo info; 1642 struct sockaddr_dl null_sdl; 1643 1644 bzero(&null_sdl, sizeof(null_sdl)); 1645 null_sdl.sdl_len = sizeof(null_sdl); 1646 null_sdl.sdl_family = AF_LINK; 1647 null_sdl.sdl_type = ifa->ifa_ifp->if_type; 1648 null_sdl.sdl_index = ifa->ifa_ifp->if_index; 1649 bzero(&info, sizeof(info)); 1650 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC; 1651 info.rti_info[RTAX_DST] = ia; 1652 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1653 error = rtrequest1_fib(RTM_DELETE, &info, NULL, ifa->ifa_ifp->if_fib); 1654 1655 if (error != 0) 1656 log(LOG_DEBUG, "%s: deletion failed: %u\n", __func__, error); 1657 1658 return (error); 1659 } 1660 1661 int 1662 ifa_switch_loopback_route(struct ifaddr *ifa, struct sockaddr *sa, int fib) 1663 { 1664 struct rtentry *rt; 1665 1666 rt = rtalloc1_fib(sa, 0, 0, fib); 1667 if (rt == NULL) { 1668 log(LOG_DEBUG, "%s: fail", __func__); 1669 return (EHOSTUNREACH); 1670 } 1671 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1672 ifa->ifa_ifp->if_type; 1673 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1674 ifa->ifa_ifp->if_index; 1675 RTFREE_LOCKED(rt); 1676 1677 return (0); 1678 } 1679 1680 /* 1681 * XXX: Because sockaddr_dl has deeper structure than the sockaddr 1682 * structs used to represent other address families, it is necessary 1683 * to perform a different comparison. 1684 */ 1685 1686 #define sa_dl_equal(a1, a2) \ 1687 ((((struct sockaddr_dl *)(a1))->sdl_len == \ 1688 ((struct sockaddr_dl *)(a2))->sdl_len) && \ 1689 (bcmp(LLADDR((struct sockaddr_dl *)(a1)), \ 1690 LLADDR((struct sockaddr_dl *)(a2)), \ 1691 ((struct sockaddr_dl *)(a1))->sdl_alen) == 0)) 1692 1693 /* 1694 * Locate an interface based on a complete address. 1695 */ 1696 /*ARGSUSED*/ 1697 static struct ifaddr * 1698 ifa_ifwithaddr_internal(struct sockaddr *addr, int getref) 1699 { 1700 struct ifnet *ifp; 1701 struct ifaddr *ifa; 1702 1703 IFNET_RLOCK_NOSLEEP(); 1704 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1705 IF_ADDR_RLOCK(ifp); 1706 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1707 if (ifa->ifa_addr->sa_family != addr->sa_family) 1708 continue; 1709 if (sa_equal(addr, ifa->ifa_addr)) { 1710 if (getref) 1711 ifa_ref(ifa); 1712 IF_ADDR_RUNLOCK(ifp); 1713 goto done; 1714 } 1715 /* IP6 doesn't have broadcast */ 1716 if ((ifp->if_flags & IFF_BROADCAST) && 1717 ifa->ifa_broadaddr && 1718 ifa->ifa_broadaddr->sa_len != 0 && 1719 sa_equal(ifa->ifa_broadaddr, addr)) { 1720 if (getref) 1721 ifa_ref(ifa); 1722 IF_ADDR_RUNLOCK(ifp); 1723 goto done; 1724 } 1725 } 1726 IF_ADDR_RUNLOCK(ifp); 1727 } 1728 ifa = NULL; 1729 done: 1730 IFNET_RUNLOCK_NOSLEEP(); 1731 return (ifa); 1732 } 1733 1734 struct ifaddr * 1735 ifa_ifwithaddr(struct sockaddr *addr) 1736 { 1737 1738 return (ifa_ifwithaddr_internal(addr, 1)); 1739 } 1740 1741 int 1742 ifa_ifwithaddr_check(struct sockaddr *addr) 1743 { 1744 1745 return (ifa_ifwithaddr_internal(addr, 0) != NULL); 1746 } 1747 1748 /* 1749 * Locate an interface based on the broadcast address. 1750 */ 1751 /* ARGSUSED */ 1752 struct ifaddr * 1753 ifa_ifwithbroadaddr(struct sockaddr *addr, int fibnum) 1754 { 1755 struct ifnet *ifp; 1756 struct ifaddr *ifa; 1757 1758 IFNET_RLOCK_NOSLEEP(); 1759 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1760 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1761 continue; 1762 IF_ADDR_RLOCK(ifp); 1763 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1764 if (ifa->ifa_addr->sa_family != addr->sa_family) 1765 continue; 1766 if ((ifp->if_flags & IFF_BROADCAST) && 1767 ifa->ifa_broadaddr && 1768 ifa->ifa_broadaddr->sa_len != 0 && 1769 sa_equal(ifa->ifa_broadaddr, addr)) { 1770 ifa_ref(ifa); 1771 IF_ADDR_RUNLOCK(ifp); 1772 goto done; 1773 } 1774 } 1775 IF_ADDR_RUNLOCK(ifp); 1776 } 1777 ifa = NULL; 1778 done: 1779 IFNET_RUNLOCK_NOSLEEP(); 1780 return (ifa); 1781 } 1782 1783 /* 1784 * Locate the point to point interface with a given destination address. 1785 */ 1786 /*ARGSUSED*/ 1787 struct ifaddr * 1788 ifa_ifwithdstaddr(struct sockaddr *addr, int fibnum) 1789 { 1790 struct ifnet *ifp; 1791 struct ifaddr *ifa; 1792 1793 IFNET_RLOCK_NOSLEEP(); 1794 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1795 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1796 continue; 1797 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1798 continue; 1799 IF_ADDR_RLOCK(ifp); 1800 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1801 if (ifa->ifa_addr->sa_family != addr->sa_family) 1802 continue; 1803 if (ifa->ifa_dstaddr != NULL && 1804 sa_equal(addr, ifa->ifa_dstaddr)) { 1805 ifa_ref(ifa); 1806 IF_ADDR_RUNLOCK(ifp); 1807 goto done; 1808 } 1809 } 1810 IF_ADDR_RUNLOCK(ifp); 1811 } 1812 ifa = NULL; 1813 done: 1814 IFNET_RUNLOCK_NOSLEEP(); 1815 return (ifa); 1816 } 1817 1818 /* 1819 * Find an interface on a specific network. If many, choice 1820 * is most specific found. 1821 */ 1822 struct ifaddr * 1823 ifa_ifwithnet(struct sockaddr *addr, int ignore_ptp, int fibnum) 1824 { 1825 struct ifnet *ifp; 1826 struct ifaddr *ifa; 1827 struct ifaddr *ifa_maybe = NULL; 1828 u_int af = addr->sa_family; 1829 char *addr_data = addr->sa_data, *cplim; 1830 1831 /* 1832 * AF_LINK addresses can be looked up directly by their index number, 1833 * so do that if we can. 1834 */ 1835 if (af == AF_LINK) { 1836 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr; 1837 if (sdl->sdl_index && sdl->sdl_index <= V_if_index) 1838 return (ifaddr_byindex(sdl->sdl_index)); 1839 } 1840 1841 /* 1842 * Scan though each interface, looking for ones that have addresses 1843 * in this address family and the requested fib. Maintain a reference 1844 * on ifa_maybe once we find one, as we release the IF_ADDR_RLOCK() that 1845 * kept it stable when we move onto the next interface. 1846 */ 1847 IFNET_RLOCK_NOSLEEP(); 1848 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1849 if ((fibnum != RT_ALL_FIBS) && (ifp->if_fib != fibnum)) 1850 continue; 1851 IF_ADDR_RLOCK(ifp); 1852 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1853 char *cp, *cp2, *cp3; 1854 1855 if (ifa->ifa_addr->sa_family != af) 1856 next: continue; 1857 if (af == AF_INET && 1858 ifp->if_flags & IFF_POINTOPOINT && !ignore_ptp) { 1859 /* 1860 * This is a bit broken as it doesn't 1861 * take into account that the remote end may 1862 * be a single node in the network we are 1863 * looking for. 1864 * The trouble is that we don't know the 1865 * netmask for the remote end. 1866 */ 1867 if (ifa->ifa_dstaddr != NULL && 1868 sa_equal(addr, ifa->ifa_dstaddr)) { 1869 ifa_ref(ifa); 1870 IF_ADDR_RUNLOCK(ifp); 1871 goto done; 1872 } 1873 } else { 1874 /* 1875 * Scan all the bits in the ifa's address. 1876 * If a bit dissagrees with what we are 1877 * looking for, mask it with the netmask 1878 * to see if it really matters. 1879 * (A byte at a time) 1880 */ 1881 if (ifa->ifa_netmask == 0) 1882 continue; 1883 cp = addr_data; 1884 cp2 = ifa->ifa_addr->sa_data; 1885 cp3 = ifa->ifa_netmask->sa_data; 1886 cplim = ifa->ifa_netmask->sa_len 1887 + (char *)ifa->ifa_netmask; 1888 while (cp3 < cplim) 1889 if ((*cp++ ^ *cp2++) & *cp3++) 1890 goto next; /* next address! */ 1891 /* 1892 * If the netmask of what we just found 1893 * is more specific than what we had before 1894 * (if we had one), or if the virtual status 1895 * of new prefix is better than of the old one, 1896 * then remember the new one before continuing 1897 * to search for an even better one. 1898 */ 1899 if (ifa_maybe == NULL || 1900 ifa_preferred(ifa_maybe, ifa) || 1901 rn_refines((caddr_t)ifa->ifa_netmask, 1902 (caddr_t)ifa_maybe->ifa_netmask)) { 1903 if (ifa_maybe != NULL) 1904 ifa_free(ifa_maybe); 1905 ifa_maybe = ifa; 1906 ifa_ref(ifa_maybe); 1907 } 1908 } 1909 } 1910 IF_ADDR_RUNLOCK(ifp); 1911 } 1912 ifa = ifa_maybe; 1913 ifa_maybe = NULL; 1914 done: 1915 IFNET_RUNLOCK_NOSLEEP(); 1916 if (ifa_maybe != NULL) 1917 ifa_free(ifa_maybe); 1918 return (ifa); 1919 } 1920 1921 /* 1922 * Find an interface address specific to an interface best matching 1923 * a given address. 1924 */ 1925 struct ifaddr * 1926 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp) 1927 { 1928 struct ifaddr *ifa; 1929 char *cp, *cp2, *cp3; 1930 char *cplim; 1931 struct ifaddr *ifa_maybe = NULL; 1932 u_int af = addr->sa_family; 1933 1934 if (af >= AF_MAX) 1935 return (NULL); 1936 IF_ADDR_RLOCK(ifp); 1937 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1938 if (ifa->ifa_addr->sa_family != af) 1939 continue; 1940 if (ifa_maybe == NULL) 1941 ifa_maybe = ifa; 1942 if (ifa->ifa_netmask == 0) { 1943 if (sa_equal(addr, ifa->ifa_addr) || 1944 (ifa->ifa_dstaddr && 1945 sa_equal(addr, ifa->ifa_dstaddr))) 1946 goto done; 1947 continue; 1948 } 1949 if (ifp->if_flags & IFF_POINTOPOINT) { 1950 if (sa_equal(addr, ifa->ifa_dstaddr)) 1951 goto done; 1952 } else { 1953 cp = addr->sa_data; 1954 cp2 = ifa->ifa_addr->sa_data; 1955 cp3 = ifa->ifa_netmask->sa_data; 1956 cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask; 1957 for (; cp3 < cplim; cp3++) 1958 if ((*cp++ ^ *cp2++) & *cp3) 1959 break; 1960 if (cp3 == cplim) 1961 goto done; 1962 } 1963 } 1964 ifa = ifa_maybe; 1965 done: 1966 if (ifa != NULL) 1967 ifa_ref(ifa); 1968 IF_ADDR_RUNLOCK(ifp); 1969 return (ifa); 1970 } 1971 1972 /* 1973 * See whether new ifa is better than current one: 1974 * 1) A non-virtual one is preferred over virtual. 1975 * 2) A virtual in master state preferred over any other state. 1976 * 1977 * Used in several address selecting functions. 1978 */ 1979 int 1980 ifa_preferred(struct ifaddr *cur, struct ifaddr *next) 1981 { 1982 1983 return (cur->ifa_carp && (!next->ifa_carp || 1984 ((*carp_master_p)(next) && !(*carp_master_p)(cur)))); 1985 } 1986 1987 #include <net/if_llatbl.h> 1988 1989 /* 1990 * Default action when installing a route with a Link Level gateway. 1991 * Lookup an appropriate real ifa to point to. 1992 * This should be moved to /sys/net/link.c eventually. 1993 */ 1994 static void 1995 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info) 1996 { 1997 struct ifaddr *ifa, *oifa; 1998 struct sockaddr *dst; 1999 struct ifnet *ifp; 2000 2001 if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) || 2002 ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0)) 2003 return; 2004 ifa = ifaof_ifpforaddr(dst, ifp); 2005 if (ifa) { 2006 oifa = rt->rt_ifa; 2007 rt->rt_ifa = ifa; 2008 ifa_free(oifa); 2009 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest) 2010 ifa->ifa_rtrequest(cmd, rt, info); 2011 } 2012 } 2013 2014 struct sockaddr_dl * 2015 link_alloc_sdl(size_t size, int flags) 2016 { 2017 2018 return (malloc(size, M_TEMP, flags)); 2019 } 2020 2021 void 2022 link_free_sdl(struct sockaddr *sa) 2023 { 2024 free(sa, M_TEMP); 2025 } 2026 2027 /* 2028 * Fills in given sdl with interface basic info. 2029 * Returns pointer to filled sdl. 2030 */ 2031 struct sockaddr_dl * 2032 link_init_sdl(struct ifnet *ifp, struct sockaddr *paddr, u_char iftype) 2033 { 2034 struct sockaddr_dl *sdl; 2035 2036 sdl = (struct sockaddr_dl *)paddr; 2037 memset(sdl, 0, sizeof(struct sockaddr_dl)); 2038 sdl->sdl_len = sizeof(struct sockaddr_dl); 2039 sdl->sdl_family = AF_LINK; 2040 sdl->sdl_index = ifp->if_index; 2041 sdl->sdl_type = iftype; 2042 2043 return (sdl); 2044 } 2045 2046 /* 2047 * Mark an interface down and notify protocols of 2048 * the transition. 2049 */ 2050 static void 2051 if_unroute(struct ifnet *ifp, int flag, int fam) 2052 { 2053 struct ifaddr *ifa; 2054 2055 KASSERT(flag == IFF_UP, ("if_unroute: flag != IFF_UP")); 2056 2057 ifp->if_flags &= ~flag; 2058 getmicrotime(&ifp->if_lastchange); 2059 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2060 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2061 pfctlinput(PRC_IFDOWN, ifa->ifa_addr); 2062 ifp->if_qflush(ifp); 2063 2064 if (ifp->if_carp) 2065 (*carp_linkstate_p)(ifp); 2066 rt_ifmsg(ifp); 2067 } 2068 2069 /* 2070 * Mark an interface up and notify protocols of 2071 * the transition. 2072 */ 2073 static void 2074 if_route(struct ifnet *ifp, int flag, int fam) 2075 { 2076 struct ifaddr *ifa; 2077 2078 KASSERT(flag == IFF_UP, ("if_route: flag != IFF_UP")); 2079 2080 ifp->if_flags |= flag; 2081 getmicrotime(&ifp->if_lastchange); 2082 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 2083 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family)) 2084 pfctlinput(PRC_IFUP, ifa->ifa_addr); 2085 if (ifp->if_carp) 2086 (*carp_linkstate_p)(ifp); 2087 rt_ifmsg(ifp); 2088 #ifdef INET6 2089 in6_if_up(ifp); 2090 #endif 2091 } 2092 2093 void (*vlan_link_state_p)(struct ifnet *); /* XXX: private from if_vlan */ 2094 void (*vlan_trunk_cap_p)(struct ifnet *); /* XXX: private from if_vlan */ 2095 struct ifnet *(*vlan_trunkdev_p)(struct ifnet *); 2096 struct ifnet *(*vlan_devat_p)(struct ifnet *, uint16_t); 2097 int (*vlan_tag_p)(struct ifnet *, uint16_t *); 2098 int (*vlan_setcookie_p)(struct ifnet *, void *); 2099 void *(*vlan_cookie_p)(struct ifnet *); 2100 2101 /* 2102 * Handle a change in the interface link state. To avoid LORs 2103 * between driver lock and upper layer locks, as well as possible 2104 * recursions, we post event to taskqueue, and all job 2105 * is done in static do_link_state_change(). 2106 */ 2107 void 2108 if_link_state_change(struct ifnet *ifp, int link_state) 2109 { 2110 /* Return if state hasn't changed. */ 2111 if (ifp->if_link_state == link_state) 2112 return; 2113 2114 ifp->if_link_state = link_state; 2115 2116 taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask); 2117 } 2118 2119 static void 2120 do_link_state_change(void *arg, int pending) 2121 { 2122 struct ifnet *ifp = (struct ifnet *)arg; 2123 int link_state = ifp->if_link_state; 2124 CURVNET_SET(ifp->if_vnet); 2125 2126 /* Notify that the link state has changed. */ 2127 rt_ifmsg(ifp); 2128 if (ifp->if_vlantrunk != NULL) 2129 (*vlan_link_state_p)(ifp); 2130 2131 if ((ifp->if_type == IFT_ETHER || ifp->if_type == IFT_L2VLAN) && 2132 ifp->if_l2com != NULL) 2133 (*ng_ether_link_state_p)(ifp, link_state); 2134 if (ifp->if_carp) 2135 (*carp_linkstate_p)(ifp); 2136 if (ifp->if_bridge) 2137 (*bridge_linkstate_p)(ifp); 2138 if (ifp->if_lagg) 2139 (*lagg_linkstate_p)(ifp, link_state); 2140 2141 if (IS_DEFAULT_VNET(curvnet)) 2142 devctl_notify("IFNET", ifp->if_xname, 2143 (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", 2144 NULL); 2145 if (pending > 1) 2146 if_printf(ifp, "%d link states coalesced\n", pending); 2147 if (log_link_state_change) 2148 log(LOG_NOTICE, "%s: link state changed to %s\n", ifp->if_xname, 2149 (link_state == LINK_STATE_UP) ? "UP" : "DOWN" ); 2150 EVENTHANDLER_INVOKE(ifnet_link_event, ifp, ifp->if_link_state); 2151 CURVNET_RESTORE(); 2152 } 2153 2154 /* 2155 * Mark an interface down and notify protocols of 2156 * the transition. 2157 */ 2158 void 2159 if_down(struct ifnet *ifp) 2160 { 2161 2162 if_unroute(ifp, IFF_UP, AF_UNSPEC); 2163 } 2164 2165 /* 2166 * Mark an interface up and notify protocols of 2167 * the transition. 2168 */ 2169 void 2170 if_up(struct ifnet *ifp) 2171 { 2172 2173 if_route(ifp, IFF_UP, AF_UNSPEC); 2174 } 2175 2176 /* 2177 * Flush an interface queue. 2178 */ 2179 void 2180 if_qflush(struct ifnet *ifp) 2181 { 2182 struct mbuf *m, *n; 2183 struct ifaltq *ifq; 2184 2185 ifq = &ifp->if_snd; 2186 IFQ_LOCK(ifq); 2187 #ifdef ALTQ 2188 if (ALTQ_IS_ENABLED(ifq)) 2189 ALTQ_PURGE(ifq); 2190 #endif 2191 n = ifq->ifq_head; 2192 while ((m = n) != 0) { 2193 n = m->m_nextpkt; 2194 m_freem(m); 2195 } 2196 ifq->ifq_head = 0; 2197 ifq->ifq_tail = 0; 2198 ifq->ifq_len = 0; 2199 IFQ_UNLOCK(ifq); 2200 } 2201 2202 /* 2203 * Map interface name to interface structure pointer, with or without 2204 * returning a reference. 2205 */ 2206 struct ifnet * 2207 ifunit_ref(const char *name) 2208 { 2209 struct ifnet *ifp; 2210 2211 IFNET_RLOCK_NOSLEEP(); 2212 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2213 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0 && 2214 !(ifp->if_flags & IFF_DYING)) 2215 break; 2216 } 2217 if (ifp != NULL) 2218 if_ref(ifp); 2219 IFNET_RUNLOCK_NOSLEEP(); 2220 return (ifp); 2221 } 2222 2223 struct ifnet * 2224 ifunit(const char *name) 2225 { 2226 struct ifnet *ifp; 2227 2228 IFNET_RLOCK_NOSLEEP(); 2229 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2230 if (strncmp(name, ifp->if_xname, IFNAMSIZ) == 0) 2231 break; 2232 } 2233 IFNET_RUNLOCK_NOSLEEP(); 2234 return (ifp); 2235 } 2236 2237 /* 2238 * Hardware specific interface ioctls. 2239 */ 2240 static int 2241 ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td) 2242 { 2243 struct ifreq *ifr; 2244 int error = 0; 2245 int new_flags, temp_flags; 2246 size_t namelen, onamelen; 2247 size_t descrlen; 2248 char *descrbuf, *odescrbuf; 2249 char new_name[IFNAMSIZ]; 2250 struct ifaddr *ifa; 2251 struct sockaddr_dl *sdl; 2252 2253 ifr = (struct ifreq *)data; 2254 switch (cmd) { 2255 case SIOCGIFINDEX: 2256 ifr->ifr_index = ifp->if_index; 2257 break; 2258 2259 case SIOCGIFFLAGS: 2260 temp_flags = ifp->if_flags | ifp->if_drv_flags; 2261 ifr->ifr_flags = temp_flags & 0xffff; 2262 ifr->ifr_flagshigh = temp_flags >> 16; 2263 break; 2264 2265 case SIOCGIFCAP: 2266 ifr->ifr_reqcap = ifp->if_capabilities; 2267 ifr->ifr_curcap = ifp->if_capenable; 2268 break; 2269 2270 #ifdef MAC 2271 case SIOCGIFMAC: 2272 error = mac_ifnet_ioctl_get(td->td_ucred, ifr, ifp); 2273 break; 2274 #endif 2275 2276 case SIOCGIFMETRIC: 2277 ifr->ifr_metric = ifp->if_metric; 2278 break; 2279 2280 case SIOCGIFMTU: 2281 ifr->ifr_mtu = ifp->if_mtu; 2282 break; 2283 2284 case SIOCGIFPHYS: 2285 /* XXXGL: did this ever worked? */ 2286 ifr->ifr_phys = 0; 2287 break; 2288 2289 case SIOCGIFDESCR: 2290 error = 0; 2291 sx_slock(&ifdescr_sx); 2292 if (ifp->if_description == NULL) 2293 error = ENOMSG; 2294 else { 2295 /* space for terminating nul */ 2296 descrlen = strlen(ifp->if_description) + 1; 2297 if (ifr->ifr_buffer.length < descrlen) 2298 ifr->ifr_buffer.buffer = NULL; 2299 else 2300 error = copyout(ifp->if_description, 2301 ifr->ifr_buffer.buffer, descrlen); 2302 ifr->ifr_buffer.length = descrlen; 2303 } 2304 sx_sunlock(&ifdescr_sx); 2305 break; 2306 2307 case SIOCSIFDESCR: 2308 error = priv_check(td, PRIV_NET_SETIFDESCR); 2309 if (error) 2310 return (error); 2311 2312 /* 2313 * Copy only (length-1) bytes to make sure that 2314 * if_description is always nul terminated. The 2315 * length parameter is supposed to count the 2316 * terminating nul in. 2317 */ 2318 if (ifr->ifr_buffer.length > ifdescr_maxlen) 2319 return (ENAMETOOLONG); 2320 else if (ifr->ifr_buffer.length == 0) 2321 descrbuf = NULL; 2322 else { 2323 descrbuf = malloc(ifr->ifr_buffer.length, M_IFDESCR, 2324 M_WAITOK | M_ZERO); 2325 error = copyin(ifr->ifr_buffer.buffer, descrbuf, 2326 ifr->ifr_buffer.length - 1); 2327 if (error) { 2328 free(descrbuf, M_IFDESCR); 2329 break; 2330 } 2331 } 2332 2333 sx_xlock(&ifdescr_sx); 2334 odescrbuf = ifp->if_description; 2335 ifp->if_description = descrbuf; 2336 sx_xunlock(&ifdescr_sx); 2337 2338 getmicrotime(&ifp->if_lastchange); 2339 free(odescrbuf, M_IFDESCR); 2340 break; 2341 2342 case SIOCGIFFIB: 2343 ifr->ifr_fib = ifp->if_fib; 2344 break; 2345 2346 case SIOCSIFFIB: 2347 error = priv_check(td, PRIV_NET_SETIFFIB); 2348 if (error) 2349 return (error); 2350 if (ifr->ifr_fib >= rt_numfibs) 2351 return (EINVAL); 2352 2353 ifp->if_fib = ifr->ifr_fib; 2354 break; 2355 2356 case SIOCSIFFLAGS: 2357 error = priv_check(td, PRIV_NET_SETIFFLAGS); 2358 if (error) 2359 return (error); 2360 /* 2361 * Currently, no driver owned flags pass the IFF_CANTCHANGE 2362 * check, so we don't need special handling here yet. 2363 */ 2364 new_flags = (ifr->ifr_flags & 0xffff) | 2365 (ifr->ifr_flagshigh << 16); 2366 if (ifp->if_flags & IFF_UP && 2367 (new_flags & IFF_UP) == 0) { 2368 if_down(ifp); 2369 } else if (new_flags & IFF_UP && 2370 (ifp->if_flags & IFF_UP) == 0) { 2371 if_up(ifp); 2372 } 2373 /* See if permanently promiscuous mode bit is about to flip */ 2374 if ((ifp->if_flags ^ new_flags) & IFF_PPROMISC) { 2375 if (new_flags & IFF_PPROMISC) 2376 ifp->if_flags |= IFF_PROMISC; 2377 else if (ifp->if_pcount == 0) 2378 ifp->if_flags &= ~IFF_PROMISC; 2379 log(LOG_INFO, "%s: permanently promiscuous mode %s\n", 2380 ifp->if_xname, 2381 (new_flags & IFF_PPROMISC) ? "enabled" : "disabled"); 2382 } 2383 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) | 2384 (new_flags &~ IFF_CANTCHANGE); 2385 if (ifp->if_ioctl) { 2386 (void) (*ifp->if_ioctl)(ifp, cmd, data); 2387 } 2388 getmicrotime(&ifp->if_lastchange); 2389 break; 2390 2391 case SIOCSIFCAP: 2392 error = priv_check(td, PRIV_NET_SETIFCAP); 2393 if (error) 2394 return (error); 2395 if (ifp->if_ioctl == NULL) 2396 return (EOPNOTSUPP); 2397 if (ifr->ifr_reqcap & ~ifp->if_capabilities) 2398 return (EINVAL); 2399 error = (*ifp->if_ioctl)(ifp, cmd, data); 2400 if (error == 0) 2401 getmicrotime(&ifp->if_lastchange); 2402 break; 2403 2404 #ifdef MAC 2405 case SIOCSIFMAC: 2406 error = mac_ifnet_ioctl_set(td->td_ucred, ifr, ifp); 2407 break; 2408 #endif 2409 2410 case SIOCSIFNAME: 2411 error = priv_check(td, PRIV_NET_SETIFNAME); 2412 if (error) 2413 return (error); 2414 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL); 2415 if (error != 0) 2416 return (error); 2417 if (new_name[0] == '\0') 2418 return (EINVAL); 2419 if (ifunit(new_name) != NULL) 2420 return (EEXIST); 2421 2422 /* 2423 * XXX: Locking. Nothing else seems to lock if_flags, 2424 * and there are numerous other races with the 2425 * ifunit() checks not being atomic with namespace 2426 * changes (renames, vmoves, if_attach, etc). 2427 */ 2428 ifp->if_flags |= IFF_RENAMING; 2429 2430 /* Announce the departure of the interface. */ 2431 rt_ifannouncemsg(ifp, IFAN_DEPARTURE); 2432 EVENTHANDLER_INVOKE(ifnet_departure_event, ifp); 2433 2434 log(LOG_INFO, "%s: changing name to '%s'\n", 2435 ifp->if_xname, new_name); 2436 2437 IF_ADDR_WLOCK(ifp); 2438 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname)); 2439 ifa = ifp->if_addr; 2440 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 2441 namelen = strlen(new_name); 2442 onamelen = sdl->sdl_nlen; 2443 /* 2444 * Move the address if needed. This is safe because we 2445 * allocate space for a name of length IFNAMSIZ when we 2446 * create this in if_attach(). 2447 */ 2448 if (namelen != onamelen) { 2449 bcopy(sdl->sdl_data + onamelen, 2450 sdl->sdl_data + namelen, sdl->sdl_alen); 2451 } 2452 bcopy(new_name, sdl->sdl_data, namelen); 2453 sdl->sdl_nlen = namelen; 2454 sdl = (struct sockaddr_dl *)ifa->ifa_netmask; 2455 bzero(sdl->sdl_data, onamelen); 2456 while (namelen != 0) 2457 sdl->sdl_data[--namelen] = 0xff; 2458 IF_ADDR_WUNLOCK(ifp); 2459 2460 EVENTHANDLER_INVOKE(ifnet_arrival_event, ifp); 2461 /* Announce the return of the interface. */ 2462 rt_ifannouncemsg(ifp, IFAN_ARRIVAL); 2463 2464 ifp->if_flags &= ~IFF_RENAMING; 2465 break; 2466 2467 #ifdef VIMAGE 2468 case SIOCSIFVNET: 2469 error = priv_check(td, PRIV_NET_SETIFVNET); 2470 if (error) 2471 return (error); 2472 error = if_vmove_loan(td, ifp, ifr->ifr_name, ifr->ifr_jid); 2473 break; 2474 #endif 2475 2476 case SIOCSIFMETRIC: 2477 error = priv_check(td, PRIV_NET_SETIFMETRIC); 2478 if (error) 2479 return (error); 2480 ifp->if_metric = ifr->ifr_metric; 2481 getmicrotime(&ifp->if_lastchange); 2482 break; 2483 2484 case SIOCSIFPHYS: 2485 error = priv_check(td, PRIV_NET_SETIFPHYS); 2486 if (error) 2487 return (error); 2488 if (ifp->if_ioctl == NULL) 2489 return (EOPNOTSUPP); 2490 error = (*ifp->if_ioctl)(ifp, cmd, data); 2491 if (error == 0) 2492 getmicrotime(&ifp->if_lastchange); 2493 break; 2494 2495 case SIOCSIFMTU: 2496 { 2497 u_long oldmtu = ifp->if_mtu; 2498 2499 error = priv_check(td, PRIV_NET_SETIFMTU); 2500 if (error) 2501 return (error); 2502 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) 2503 return (EINVAL); 2504 if (ifp->if_ioctl == NULL) 2505 return (EOPNOTSUPP); 2506 error = (*ifp->if_ioctl)(ifp, cmd, data); 2507 if (error == 0) { 2508 getmicrotime(&ifp->if_lastchange); 2509 rt_ifmsg(ifp); 2510 } 2511 /* 2512 * If the link MTU changed, do network layer specific procedure. 2513 */ 2514 if (ifp->if_mtu != oldmtu) { 2515 #ifdef INET6 2516 nd6_setmtu(ifp); 2517 #endif 2518 rt_updatemtu(ifp); 2519 } 2520 break; 2521 } 2522 2523 case SIOCADDMULTI: 2524 case SIOCDELMULTI: 2525 if (cmd == SIOCADDMULTI) 2526 error = priv_check(td, PRIV_NET_ADDMULTI); 2527 else 2528 error = priv_check(td, PRIV_NET_DELMULTI); 2529 if (error) 2530 return (error); 2531 2532 /* Don't allow group membership on non-multicast interfaces. */ 2533 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2534 return (EOPNOTSUPP); 2535 2536 /* Don't let users screw up protocols' entries. */ 2537 if (ifr->ifr_addr.sa_family != AF_LINK) 2538 return (EINVAL); 2539 2540 if (cmd == SIOCADDMULTI) { 2541 struct ifmultiaddr *ifma; 2542 2543 /* 2544 * Userland is only permitted to join groups once 2545 * via the if_addmulti() KPI, because it cannot hold 2546 * struct ifmultiaddr * between calls. It may also 2547 * lose a race while we check if the membership 2548 * already exists. 2549 */ 2550 IF_ADDR_RLOCK(ifp); 2551 ifma = if_findmulti(ifp, &ifr->ifr_addr); 2552 IF_ADDR_RUNLOCK(ifp); 2553 if (ifma != NULL) 2554 error = EADDRINUSE; 2555 else 2556 error = if_addmulti(ifp, &ifr->ifr_addr, &ifma); 2557 } else { 2558 error = if_delmulti(ifp, &ifr->ifr_addr); 2559 } 2560 if (error == 0) 2561 getmicrotime(&ifp->if_lastchange); 2562 break; 2563 2564 case SIOCSIFPHYADDR: 2565 case SIOCDIFPHYADDR: 2566 #ifdef INET6 2567 case SIOCSIFPHYADDR_IN6: 2568 #endif 2569 case SIOCSIFMEDIA: 2570 case SIOCSIFGENERIC: 2571 error = priv_check(td, PRIV_NET_HWIOCTL); 2572 if (error) 2573 return (error); 2574 if (ifp->if_ioctl == NULL) 2575 return (EOPNOTSUPP); 2576 error = (*ifp->if_ioctl)(ifp, cmd, data); 2577 if (error == 0) 2578 getmicrotime(&ifp->if_lastchange); 2579 break; 2580 2581 case SIOCGIFSTATUS: 2582 case SIOCGIFPSRCADDR: 2583 case SIOCGIFPDSTADDR: 2584 case SIOCGIFMEDIA: 2585 case SIOCGIFGENERIC: 2586 if (ifp->if_ioctl == NULL) 2587 return (EOPNOTSUPP); 2588 error = (*ifp->if_ioctl)(ifp, cmd, data); 2589 break; 2590 2591 case SIOCSIFLLADDR: 2592 error = priv_check(td, PRIV_NET_SETLLADDR); 2593 if (error) 2594 return (error); 2595 error = if_setlladdr(ifp, 2596 ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len); 2597 EVENTHANDLER_INVOKE(iflladdr_event, ifp); 2598 break; 2599 2600 case SIOCAIFGROUP: 2601 { 2602 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2603 2604 error = priv_check(td, PRIV_NET_ADDIFGROUP); 2605 if (error) 2606 return (error); 2607 if ((error = if_addgroup(ifp, ifgr->ifgr_group))) 2608 return (error); 2609 break; 2610 } 2611 2612 case SIOCGIFGROUP: 2613 if ((error = if_getgroup((struct ifgroupreq *)ifr, ifp))) 2614 return (error); 2615 break; 2616 2617 case SIOCDIFGROUP: 2618 { 2619 struct ifgroupreq *ifgr = (struct ifgroupreq *)ifr; 2620 2621 error = priv_check(td, PRIV_NET_DELIFGROUP); 2622 if (error) 2623 return (error); 2624 if ((error = if_delgroup(ifp, ifgr->ifgr_group))) 2625 return (error); 2626 break; 2627 } 2628 2629 default: 2630 error = ENOIOCTL; 2631 break; 2632 } 2633 return (error); 2634 } 2635 2636 #ifdef COMPAT_FREEBSD32 2637 struct ifconf32 { 2638 int32_t ifc_len; 2639 union { 2640 uint32_t ifcu_buf; 2641 uint32_t ifcu_req; 2642 } ifc_ifcu; 2643 }; 2644 #define SIOCGIFCONF32 _IOWR('i', 36, struct ifconf32) 2645 #endif 2646 2647 /* 2648 * Interface ioctls. 2649 */ 2650 int 2651 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct thread *td) 2652 { 2653 struct ifnet *ifp; 2654 struct ifreq *ifr; 2655 int error; 2656 int oif_flags; 2657 2658 CURVNET_SET(so->so_vnet); 2659 switch (cmd) { 2660 case SIOCGIFCONF: 2661 error = ifconf(cmd, data); 2662 CURVNET_RESTORE(); 2663 return (error); 2664 2665 #ifdef COMPAT_FREEBSD32 2666 case SIOCGIFCONF32: 2667 { 2668 struct ifconf32 *ifc32; 2669 struct ifconf ifc; 2670 2671 ifc32 = (struct ifconf32 *)data; 2672 ifc.ifc_len = ifc32->ifc_len; 2673 ifc.ifc_buf = PTRIN(ifc32->ifc_buf); 2674 2675 error = ifconf(SIOCGIFCONF, (void *)&ifc); 2676 CURVNET_RESTORE(); 2677 if (error == 0) 2678 ifc32->ifc_len = ifc.ifc_len; 2679 return (error); 2680 } 2681 #endif 2682 } 2683 ifr = (struct ifreq *)data; 2684 2685 switch (cmd) { 2686 #ifdef VIMAGE 2687 case SIOCSIFRVNET: 2688 error = priv_check(td, PRIV_NET_SETIFVNET); 2689 if (error == 0) 2690 error = if_vmove_reclaim(td, ifr->ifr_name, 2691 ifr->ifr_jid); 2692 CURVNET_RESTORE(); 2693 return (error); 2694 #endif 2695 case SIOCIFCREATE: 2696 case SIOCIFCREATE2: 2697 error = priv_check(td, PRIV_NET_IFCREATE); 2698 if (error == 0) 2699 error = if_clone_create(ifr->ifr_name, 2700 sizeof(ifr->ifr_name), 2701 cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL); 2702 CURVNET_RESTORE(); 2703 return (error); 2704 case SIOCIFDESTROY: 2705 error = priv_check(td, PRIV_NET_IFDESTROY); 2706 if (error == 0) 2707 error = if_clone_destroy(ifr->ifr_name); 2708 CURVNET_RESTORE(); 2709 return (error); 2710 2711 case SIOCIFGCLONERS: 2712 error = if_clone_list((struct if_clonereq *)data); 2713 CURVNET_RESTORE(); 2714 return (error); 2715 case SIOCGIFGMEMB: 2716 error = if_getgroupmembers((struct ifgroupreq *)data); 2717 CURVNET_RESTORE(); 2718 return (error); 2719 #if defined(INET) || defined(INET6) 2720 case SIOCSVH: 2721 case SIOCGVH: 2722 if (carp_ioctl_p == NULL) 2723 error = EPROTONOSUPPORT; 2724 else 2725 error = (*carp_ioctl_p)(ifr, cmd, td); 2726 CURVNET_RESTORE(); 2727 return (error); 2728 #endif 2729 } 2730 2731 ifp = ifunit_ref(ifr->ifr_name); 2732 if (ifp == NULL) { 2733 CURVNET_RESTORE(); 2734 return (ENXIO); 2735 } 2736 2737 error = ifhwioctl(cmd, ifp, data, td); 2738 if (error != ENOIOCTL) { 2739 if_rele(ifp); 2740 CURVNET_RESTORE(); 2741 return (error); 2742 } 2743 2744 oif_flags = ifp->if_flags; 2745 if (so->so_proto == NULL) { 2746 if_rele(ifp); 2747 CURVNET_RESTORE(); 2748 return (EOPNOTSUPP); 2749 } 2750 2751 /* 2752 * Pass the request on to the socket control method, and if the 2753 * latter returns EOPNOTSUPP, directly to the interface. 2754 * 2755 * Make an exception for the legacy SIOCSIF* requests. Drivers 2756 * trust SIOCSIFADDR et al to come from an already privileged 2757 * layer, and do not perform any credentials checks or input 2758 * validation. 2759 */ 2760 error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 2761 ifp, td)); 2762 if (error == EOPNOTSUPP && ifp != NULL && ifp->if_ioctl != NULL && 2763 cmd != SIOCSIFADDR && cmd != SIOCSIFBRDADDR && 2764 cmd != SIOCSIFDSTADDR && cmd != SIOCSIFNETMASK) 2765 error = (*ifp->if_ioctl)(ifp, cmd, data); 2766 2767 if ((oif_flags ^ ifp->if_flags) & IFF_UP) { 2768 #ifdef INET6 2769 if (ifp->if_flags & IFF_UP) 2770 in6_if_up(ifp); 2771 #endif 2772 } 2773 if_rele(ifp); 2774 CURVNET_RESTORE(); 2775 return (error); 2776 } 2777 2778 /* 2779 * The code common to handling reference counted flags, 2780 * e.g., in ifpromisc() and if_allmulti(). 2781 * The "pflag" argument can specify a permanent mode flag to check, 2782 * such as IFF_PPROMISC for promiscuous mode; should be 0 if none. 2783 * 2784 * Only to be used on stack-owned flags, not driver-owned flags. 2785 */ 2786 static int 2787 if_setflag(struct ifnet *ifp, int flag, int pflag, int *refcount, int onswitch) 2788 { 2789 struct ifreq ifr; 2790 int error; 2791 int oldflags, oldcount; 2792 2793 /* Sanity checks to catch programming errors */ 2794 KASSERT((flag & (IFF_DRV_OACTIVE|IFF_DRV_RUNNING)) == 0, 2795 ("%s: setting driver-owned flag %d", __func__, flag)); 2796 2797 if (onswitch) 2798 KASSERT(*refcount >= 0, 2799 ("%s: increment negative refcount %d for flag %d", 2800 __func__, *refcount, flag)); 2801 else 2802 KASSERT(*refcount > 0, 2803 ("%s: decrement non-positive refcount %d for flag %d", 2804 __func__, *refcount, flag)); 2805 2806 /* In case this mode is permanent, just touch refcount */ 2807 if (ifp->if_flags & pflag) { 2808 *refcount += onswitch ? 1 : -1; 2809 return (0); 2810 } 2811 2812 /* Save ifnet parameters for if_ioctl() may fail */ 2813 oldcount = *refcount; 2814 oldflags = ifp->if_flags; 2815 2816 /* 2817 * See if we aren't the only and touching refcount is enough. 2818 * Actually toggle interface flag if we are the first or last. 2819 */ 2820 if (onswitch) { 2821 if ((*refcount)++) 2822 return (0); 2823 ifp->if_flags |= flag; 2824 } else { 2825 if (--(*refcount)) 2826 return (0); 2827 ifp->if_flags &= ~flag; 2828 } 2829 2830 /* Call down the driver since we've changed interface flags */ 2831 if (ifp->if_ioctl == NULL) { 2832 error = EOPNOTSUPP; 2833 goto recover; 2834 } 2835 ifr.ifr_flags = ifp->if_flags & 0xffff; 2836 ifr.ifr_flagshigh = ifp->if_flags >> 16; 2837 error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 2838 if (error) 2839 goto recover; 2840 /* Notify userland that interface flags have changed */ 2841 rt_ifmsg(ifp); 2842 return (0); 2843 2844 recover: 2845 /* Recover after driver error */ 2846 *refcount = oldcount; 2847 ifp->if_flags = oldflags; 2848 return (error); 2849 } 2850 2851 /* 2852 * Set/clear promiscuous mode on interface ifp based on the truth value 2853 * of pswitch. The calls are reference counted so that only the first 2854 * "on" request actually has an effect, as does the final "off" request. 2855 * Results are undefined if the "off" and "on" requests are not matched. 2856 */ 2857 int 2858 ifpromisc(struct ifnet *ifp, int pswitch) 2859 { 2860 int error; 2861 int oldflags = ifp->if_flags; 2862 2863 error = if_setflag(ifp, IFF_PROMISC, IFF_PPROMISC, 2864 &ifp->if_pcount, pswitch); 2865 /* If promiscuous mode status has changed, log a message */ 2866 if (error == 0 && ((ifp->if_flags ^ oldflags) & IFF_PROMISC)) 2867 log(LOG_INFO, "%s: promiscuous mode %s\n", 2868 ifp->if_xname, 2869 (ifp->if_flags & IFF_PROMISC) ? "enabled" : "disabled"); 2870 return (error); 2871 } 2872 2873 /* 2874 * Return interface configuration 2875 * of system. List may be used 2876 * in later ioctl's (above) to get 2877 * other information. 2878 */ 2879 /*ARGSUSED*/ 2880 static int 2881 ifconf(u_long cmd, caddr_t data) 2882 { 2883 struct ifconf *ifc = (struct ifconf *)data; 2884 struct ifnet *ifp; 2885 struct ifaddr *ifa; 2886 struct ifreq ifr; 2887 struct sbuf *sb; 2888 int error, full = 0, valid_len, max_len; 2889 2890 /* Limit initial buffer size to MAXPHYS to avoid DoS from userspace. */ 2891 max_len = MAXPHYS - 1; 2892 2893 /* Prevent hostile input from being able to crash the system */ 2894 if (ifc->ifc_len <= 0) 2895 return (EINVAL); 2896 2897 again: 2898 if (ifc->ifc_len <= max_len) { 2899 max_len = ifc->ifc_len; 2900 full = 1; 2901 } 2902 sb = sbuf_new(NULL, NULL, max_len + 1, SBUF_FIXEDLEN); 2903 max_len = 0; 2904 valid_len = 0; 2905 2906 IFNET_RLOCK(); 2907 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2908 int addrs; 2909 2910 /* 2911 * Zero the ifr_name buffer to make sure we don't 2912 * disclose the contents of the stack. 2913 */ 2914 memset(ifr.ifr_name, 0, sizeof(ifr.ifr_name)); 2915 2916 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name)) 2917 >= sizeof(ifr.ifr_name)) { 2918 sbuf_delete(sb); 2919 IFNET_RUNLOCK(); 2920 return (ENAMETOOLONG); 2921 } 2922 2923 addrs = 0; 2924 IF_ADDR_RLOCK(ifp); 2925 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2926 struct sockaddr *sa = ifa->ifa_addr; 2927 2928 if (prison_if(curthread->td_ucred, sa) != 0) 2929 continue; 2930 addrs++; 2931 if (sa->sa_len <= sizeof(*sa)) { 2932 ifr.ifr_addr = *sa; 2933 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2934 max_len += sizeof(ifr); 2935 } else { 2936 sbuf_bcat(sb, &ifr, 2937 offsetof(struct ifreq, ifr_addr)); 2938 max_len += offsetof(struct ifreq, ifr_addr); 2939 sbuf_bcat(sb, sa, sa->sa_len); 2940 max_len += sa->sa_len; 2941 } 2942 2943 if (sbuf_error(sb) == 0) 2944 valid_len = sbuf_len(sb); 2945 } 2946 IF_ADDR_RUNLOCK(ifp); 2947 if (addrs == 0) { 2948 bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr)); 2949 sbuf_bcat(sb, &ifr, sizeof(ifr)); 2950 max_len += sizeof(ifr); 2951 2952 if (sbuf_error(sb) == 0) 2953 valid_len = sbuf_len(sb); 2954 } 2955 } 2956 IFNET_RUNLOCK(); 2957 2958 /* 2959 * If we didn't allocate enough space (uncommon), try again. If 2960 * we have already allocated as much space as we are allowed, 2961 * return what we've got. 2962 */ 2963 if (valid_len != max_len && !full) { 2964 sbuf_delete(sb); 2965 goto again; 2966 } 2967 2968 ifc->ifc_len = valid_len; 2969 sbuf_finish(sb); 2970 error = copyout(sbuf_data(sb), ifc->ifc_req, ifc->ifc_len); 2971 sbuf_delete(sb); 2972 return (error); 2973 } 2974 2975 /* 2976 * Just like ifpromisc(), but for all-multicast-reception mode. 2977 */ 2978 int 2979 if_allmulti(struct ifnet *ifp, int onswitch) 2980 { 2981 2982 return (if_setflag(ifp, IFF_ALLMULTI, 0, &ifp->if_amcount, onswitch)); 2983 } 2984 2985 struct ifmultiaddr * 2986 if_findmulti(struct ifnet *ifp, struct sockaddr *sa) 2987 { 2988 struct ifmultiaddr *ifma; 2989 2990 IF_ADDR_LOCK_ASSERT(ifp); 2991 2992 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 2993 if (sa->sa_family == AF_LINK) { 2994 if (sa_dl_equal(ifma->ifma_addr, sa)) 2995 break; 2996 } else { 2997 if (sa_equal(ifma->ifma_addr, sa)) 2998 break; 2999 } 3000 } 3001 3002 return ifma; 3003 } 3004 3005 /* 3006 * Allocate a new ifmultiaddr and initialize based on passed arguments. We 3007 * make copies of passed sockaddrs. The ifmultiaddr will not be added to 3008 * the ifnet multicast address list here, so the caller must do that and 3009 * other setup work (such as notifying the device driver). The reference 3010 * count is initialized to 1. 3011 */ 3012 static struct ifmultiaddr * 3013 if_allocmulti(struct ifnet *ifp, struct sockaddr *sa, struct sockaddr *llsa, 3014 int mflags) 3015 { 3016 struct ifmultiaddr *ifma; 3017 struct sockaddr *dupsa; 3018 3019 ifma = malloc(sizeof *ifma, M_IFMADDR, mflags | 3020 M_ZERO); 3021 if (ifma == NULL) 3022 return (NULL); 3023 3024 dupsa = malloc(sa->sa_len, M_IFMADDR, mflags); 3025 if (dupsa == NULL) { 3026 free(ifma, M_IFMADDR); 3027 return (NULL); 3028 } 3029 bcopy(sa, dupsa, sa->sa_len); 3030 ifma->ifma_addr = dupsa; 3031 3032 ifma->ifma_ifp = ifp; 3033 ifma->ifma_refcount = 1; 3034 ifma->ifma_protospec = NULL; 3035 3036 if (llsa == NULL) { 3037 ifma->ifma_lladdr = NULL; 3038 return (ifma); 3039 } 3040 3041 dupsa = malloc(llsa->sa_len, M_IFMADDR, mflags); 3042 if (dupsa == NULL) { 3043 free(ifma->ifma_addr, M_IFMADDR); 3044 free(ifma, M_IFMADDR); 3045 return (NULL); 3046 } 3047 bcopy(llsa, dupsa, llsa->sa_len); 3048 ifma->ifma_lladdr = dupsa; 3049 3050 return (ifma); 3051 } 3052 3053 /* 3054 * if_freemulti: free ifmultiaddr structure and possibly attached related 3055 * addresses. The caller is responsible for implementing reference 3056 * counting, notifying the driver, handling routing messages, and releasing 3057 * any dependent link layer state. 3058 */ 3059 static void 3060 if_freemulti(struct ifmultiaddr *ifma) 3061 { 3062 3063 KASSERT(ifma->ifma_refcount == 0, ("if_freemulti: refcount %d", 3064 ifma->ifma_refcount)); 3065 3066 if (ifma->ifma_lladdr != NULL) 3067 free(ifma->ifma_lladdr, M_IFMADDR); 3068 free(ifma->ifma_addr, M_IFMADDR); 3069 free(ifma, M_IFMADDR); 3070 } 3071 3072 /* 3073 * Register an additional multicast address with a network interface. 3074 * 3075 * - If the address is already present, bump the reference count on the 3076 * address and return. 3077 * - If the address is not link-layer, look up a link layer address. 3078 * - Allocate address structures for one or both addresses, and attach to the 3079 * multicast address list on the interface. If automatically adding a link 3080 * layer address, the protocol address will own a reference to the link 3081 * layer address, to be freed when it is freed. 3082 * - Notify the network device driver of an addition to the multicast address 3083 * list. 3084 * 3085 * 'sa' points to caller-owned memory with the desired multicast address. 3086 * 3087 * 'retifma' will be used to return a pointer to the resulting multicast 3088 * address reference, if desired. 3089 */ 3090 int 3091 if_addmulti(struct ifnet *ifp, struct sockaddr *sa, 3092 struct ifmultiaddr **retifma) 3093 { 3094 struct ifmultiaddr *ifma, *ll_ifma; 3095 struct sockaddr *llsa; 3096 struct sockaddr_dl sdl; 3097 int error; 3098 3099 /* 3100 * If the address is already present, return a new reference to it; 3101 * otherwise, allocate storage and set up a new address. 3102 */ 3103 IF_ADDR_WLOCK(ifp); 3104 ifma = if_findmulti(ifp, sa); 3105 if (ifma != NULL) { 3106 ifma->ifma_refcount++; 3107 if (retifma != NULL) 3108 *retifma = ifma; 3109 IF_ADDR_WUNLOCK(ifp); 3110 return (0); 3111 } 3112 3113 /* 3114 * The address isn't already present; resolve the protocol address 3115 * into a link layer address, and then look that up, bump its 3116 * refcount or allocate an ifma for that also. 3117 * Most link layer resolving functions returns address data which 3118 * fits inside default sockaddr_dl structure. However callback 3119 * can allocate another sockaddr structure, in that case we need to 3120 * free it later. 3121 */ 3122 llsa = NULL; 3123 ll_ifma = NULL; 3124 if (ifp->if_resolvemulti != NULL) { 3125 /* Provide called function with buffer size information */ 3126 sdl.sdl_len = sizeof(sdl); 3127 llsa = (struct sockaddr *)&sdl; 3128 error = ifp->if_resolvemulti(ifp, &llsa, sa); 3129 if (error) 3130 goto unlock_out; 3131 } 3132 3133 /* 3134 * Allocate the new address. Don't hook it up yet, as we may also 3135 * need to allocate a link layer multicast address. 3136 */ 3137 ifma = if_allocmulti(ifp, sa, llsa, M_NOWAIT); 3138 if (ifma == NULL) { 3139 error = ENOMEM; 3140 goto free_llsa_out; 3141 } 3142 3143 /* 3144 * If a link layer address is found, we'll need to see if it's 3145 * already present in the address list, or allocate is as well. 3146 * When this block finishes, the link layer address will be on the 3147 * list. 3148 */ 3149 if (llsa != NULL) { 3150 ll_ifma = if_findmulti(ifp, llsa); 3151 if (ll_ifma == NULL) { 3152 ll_ifma = if_allocmulti(ifp, llsa, NULL, M_NOWAIT); 3153 if (ll_ifma == NULL) { 3154 --ifma->ifma_refcount; 3155 if_freemulti(ifma); 3156 error = ENOMEM; 3157 goto free_llsa_out; 3158 } 3159 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ll_ifma, 3160 ifma_link); 3161 } else 3162 ll_ifma->ifma_refcount++; 3163 ifma->ifma_llifma = ll_ifma; 3164 } 3165 3166 /* 3167 * We now have a new multicast address, ifma, and possibly a new or 3168 * referenced link layer address. Add the primary address to the 3169 * ifnet address list. 3170 */ 3171 TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link); 3172 3173 if (retifma != NULL) 3174 *retifma = ifma; 3175 3176 /* 3177 * Must generate the message while holding the lock so that 'ifma' 3178 * pointer is still valid. 3179 */ 3180 rt_newmaddrmsg(RTM_NEWMADDR, ifma); 3181 IF_ADDR_WUNLOCK(ifp); 3182 3183 /* 3184 * We are certain we have added something, so call down to the 3185 * interface to let them know about it. 3186 */ 3187 if (ifp->if_ioctl != NULL) { 3188 (void) (*ifp->if_ioctl)(ifp, SIOCADDMULTI, 0); 3189 } 3190 3191 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3192 link_free_sdl(llsa); 3193 3194 return (0); 3195 3196 free_llsa_out: 3197 if ((llsa != NULL) && (llsa != (struct sockaddr *)&sdl)) 3198 link_free_sdl(llsa); 3199 3200 unlock_out: 3201 IF_ADDR_WUNLOCK(ifp); 3202 return (error); 3203 } 3204 3205 /* 3206 * Delete a multicast group membership by network-layer group address. 3207 * 3208 * Returns ENOENT if the entry could not be found. If ifp no longer 3209 * exists, results are undefined. This entry point should only be used 3210 * from subsystems which do appropriate locking to hold ifp for the 3211 * duration of the call. 3212 * Network-layer protocol domains must use if_delmulti_ifma(). 3213 */ 3214 int 3215 if_delmulti(struct ifnet *ifp, struct sockaddr *sa) 3216 { 3217 struct ifmultiaddr *ifma; 3218 int lastref; 3219 #ifdef INVARIANTS 3220 struct ifnet *oifp; 3221 3222 IFNET_RLOCK_NOSLEEP(); 3223 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3224 if (ifp == oifp) 3225 break; 3226 if (ifp != oifp) 3227 ifp = NULL; 3228 IFNET_RUNLOCK_NOSLEEP(); 3229 3230 KASSERT(ifp != NULL, ("%s: ifnet went away", __func__)); 3231 #endif 3232 if (ifp == NULL) 3233 return (ENOENT); 3234 3235 IF_ADDR_WLOCK(ifp); 3236 lastref = 0; 3237 ifma = if_findmulti(ifp, sa); 3238 if (ifma != NULL) 3239 lastref = if_delmulti_locked(ifp, ifma, 0); 3240 IF_ADDR_WUNLOCK(ifp); 3241 3242 if (ifma == NULL) 3243 return (ENOENT); 3244 3245 if (lastref && ifp->if_ioctl != NULL) { 3246 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3247 } 3248 3249 return (0); 3250 } 3251 3252 /* 3253 * Delete all multicast group membership for an interface. 3254 * Should be used to quickly flush all multicast filters. 3255 */ 3256 void 3257 if_delallmulti(struct ifnet *ifp) 3258 { 3259 struct ifmultiaddr *ifma; 3260 struct ifmultiaddr *next; 3261 3262 IF_ADDR_WLOCK(ifp); 3263 TAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) 3264 if_delmulti_locked(ifp, ifma, 0); 3265 IF_ADDR_WUNLOCK(ifp); 3266 } 3267 3268 /* 3269 * Delete a multicast group membership by group membership pointer. 3270 * Network-layer protocol domains must use this routine. 3271 * 3272 * It is safe to call this routine if the ifp disappeared. 3273 */ 3274 void 3275 if_delmulti_ifma(struct ifmultiaddr *ifma) 3276 { 3277 struct ifnet *ifp; 3278 int lastref; 3279 3280 ifp = ifma->ifma_ifp; 3281 #ifdef DIAGNOSTIC 3282 if (ifp == NULL) { 3283 printf("%s: ifma_ifp seems to be detached\n", __func__); 3284 } else { 3285 struct ifnet *oifp; 3286 3287 IFNET_RLOCK_NOSLEEP(); 3288 TAILQ_FOREACH(oifp, &V_ifnet, if_link) 3289 if (ifp == oifp) 3290 break; 3291 if (ifp != oifp) { 3292 printf("%s: ifnet %p disappeared\n", __func__, ifp); 3293 ifp = NULL; 3294 } 3295 IFNET_RUNLOCK_NOSLEEP(); 3296 } 3297 #endif 3298 /* 3299 * If and only if the ifnet instance exists: Acquire the address lock. 3300 */ 3301 if (ifp != NULL) 3302 IF_ADDR_WLOCK(ifp); 3303 3304 lastref = if_delmulti_locked(ifp, ifma, 0); 3305 3306 if (ifp != NULL) { 3307 /* 3308 * If and only if the ifnet instance exists: 3309 * Release the address lock. 3310 * If the group was left: update the hardware hash filter. 3311 */ 3312 IF_ADDR_WUNLOCK(ifp); 3313 if (lastref && ifp->if_ioctl != NULL) { 3314 (void)(*ifp->if_ioctl)(ifp, SIOCDELMULTI, 0); 3315 } 3316 } 3317 } 3318 3319 /* 3320 * Perform deletion of network-layer and/or link-layer multicast address. 3321 * 3322 * Return 0 if the reference count was decremented. 3323 * Return 1 if the final reference was released, indicating that the 3324 * hardware hash filter should be reprogrammed. 3325 */ 3326 static int 3327 if_delmulti_locked(struct ifnet *ifp, struct ifmultiaddr *ifma, int detaching) 3328 { 3329 struct ifmultiaddr *ll_ifma; 3330 3331 if (ifp != NULL && ifma->ifma_ifp != NULL) { 3332 KASSERT(ifma->ifma_ifp == ifp, 3333 ("%s: inconsistent ifp %p", __func__, ifp)); 3334 IF_ADDR_WLOCK_ASSERT(ifp); 3335 } 3336 3337 ifp = ifma->ifma_ifp; 3338 3339 /* 3340 * If the ifnet is detaching, null out references to ifnet, 3341 * so that upper protocol layers will notice, and not attempt 3342 * to obtain locks for an ifnet which no longer exists. The 3343 * routing socket announcement must happen before the ifnet 3344 * instance is detached from the system. 3345 */ 3346 if (detaching) { 3347 #ifdef DIAGNOSTIC 3348 printf("%s: detaching ifnet instance %p\n", __func__, ifp); 3349 #endif 3350 /* 3351 * ifp may already be nulled out if we are being reentered 3352 * to delete the ll_ifma. 3353 */ 3354 if (ifp != NULL) { 3355 rt_newmaddrmsg(RTM_DELMADDR, ifma); 3356 ifma->ifma_ifp = NULL; 3357 } 3358 } 3359 3360 if (--ifma->ifma_refcount > 0) 3361 return 0; 3362 3363 /* 3364 * If this ifma is a network-layer ifma, a link-layer ifma may 3365 * have been associated with it. Release it first if so. 3366 */ 3367 ll_ifma = ifma->ifma_llifma; 3368 if (ll_ifma != NULL) { 3369 KASSERT(ifma->ifma_lladdr != NULL, 3370 ("%s: llifma w/o lladdr", __func__)); 3371 if (detaching) 3372 ll_ifma->ifma_ifp = NULL; /* XXX */ 3373 if (--ll_ifma->ifma_refcount == 0) { 3374 if (ifp != NULL) { 3375 TAILQ_REMOVE(&ifp->if_multiaddrs, ll_ifma, 3376 ifma_link); 3377 } 3378 if_freemulti(ll_ifma); 3379 } 3380 } 3381 3382 if (ifp != NULL) 3383 TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link); 3384 3385 if_freemulti(ifma); 3386 3387 /* 3388 * The last reference to this instance of struct ifmultiaddr 3389 * was released; the hardware should be notified of this change. 3390 */ 3391 return 1; 3392 } 3393 3394 /* 3395 * Set the link layer address on an interface. 3396 * 3397 * At this time we only support certain types of interfaces, 3398 * and we don't allow the length of the address to change. 3399 */ 3400 int 3401 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len) 3402 { 3403 struct sockaddr_dl *sdl; 3404 struct ifaddr *ifa; 3405 struct ifreq ifr; 3406 3407 IF_ADDR_RLOCK(ifp); 3408 ifa = ifp->if_addr; 3409 if (ifa == NULL) { 3410 IF_ADDR_RUNLOCK(ifp); 3411 return (EINVAL); 3412 } 3413 ifa_ref(ifa); 3414 IF_ADDR_RUNLOCK(ifp); 3415 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 3416 if (sdl == NULL) { 3417 ifa_free(ifa); 3418 return (EINVAL); 3419 } 3420 if (len != sdl->sdl_alen) { /* don't allow length to change */ 3421 ifa_free(ifa); 3422 return (EINVAL); 3423 } 3424 switch (ifp->if_type) { 3425 case IFT_ETHER: 3426 case IFT_FDDI: 3427 case IFT_XETHER: 3428 case IFT_ISO88025: 3429 case IFT_L2VLAN: 3430 case IFT_BRIDGE: 3431 case IFT_ARCNET: 3432 case IFT_IEEE8023ADLAG: 3433 case IFT_IEEE80211: 3434 bcopy(lladdr, LLADDR(sdl), len); 3435 ifa_free(ifa); 3436 break; 3437 default: 3438 ifa_free(ifa); 3439 return (ENODEV); 3440 } 3441 3442 /* 3443 * If the interface is already up, we need 3444 * to re-init it in order to reprogram its 3445 * address filter. 3446 */ 3447 if ((ifp->if_flags & IFF_UP) != 0) { 3448 if (ifp->if_ioctl) { 3449 ifp->if_flags &= ~IFF_UP; 3450 ifr.ifr_flags = ifp->if_flags & 0xffff; 3451 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3452 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3453 ifp->if_flags |= IFF_UP; 3454 ifr.ifr_flags = ifp->if_flags & 0xffff; 3455 ifr.ifr_flagshigh = ifp->if_flags >> 16; 3456 (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr); 3457 } 3458 #ifdef INET 3459 /* 3460 * Also send gratuitous ARPs to notify other nodes about 3461 * the address change. 3462 */ 3463 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 3464 if (ifa->ifa_addr->sa_family == AF_INET) 3465 arp_ifinit(ifp, ifa); 3466 } 3467 #endif 3468 } 3469 return (0); 3470 } 3471 3472 /* 3473 * The name argument must be a pointer to storage which will last as 3474 * long as the interface does. For physical devices, the result of 3475 * device_get_name(dev) is a good choice and for pseudo-devices a 3476 * static string works well. 3477 */ 3478 void 3479 if_initname(struct ifnet *ifp, const char *name, int unit) 3480 { 3481 ifp->if_dname = name; 3482 ifp->if_dunit = unit; 3483 if (unit != IF_DUNIT_NONE) 3484 snprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit); 3485 else 3486 strlcpy(ifp->if_xname, name, IFNAMSIZ); 3487 } 3488 3489 int 3490 if_printf(struct ifnet *ifp, const char * fmt, ...) 3491 { 3492 va_list ap; 3493 int retval; 3494 3495 retval = printf("%s: ", ifp->if_xname); 3496 va_start(ap, fmt); 3497 retval += vprintf(fmt, ap); 3498 va_end(ap); 3499 return (retval); 3500 } 3501 3502 void 3503 if_start(struct ifnet *ifp) 3504 { 3505 3506 (*(ifp)->if_start)(ifp); 3507 } 3508 3509 /* 3510 * Backwards compatibility interface for drivers 3511 * that have not implemented it 3512 */ 3513 static int 3514 if_transmit(struct ifnet *ifp, struct mbuf *m) 3515 { 3516 int error; 3517 3518 IFQ_HANDOFF(ifp, m, error); 3519 return (error); 3520 } 3521 3522 static void 3523 if_input_default(struct ifnet *ifp __unused, struct mbuf *m) 3524 { 3525 3526 m_freem(m); 3527 } 3528 3529 int 3530 if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust) 3531 { 3532 int active = 0; 3533 3534 IF_LOCK(ifq); 3535 if (_IF_QFULL(ifq)) { 3536 IF_UNLOCK(ifq); 3537 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 3538 m_freem(m); 3539 return (0); 3540 } 3541 if (ifp != NULL) { 3542 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len + adjust); 3543 if (m->m_flags & (M_BCAST|M_MCAST)) 3544 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 3545 active = ifp->if_drv_flags & IFF_DRV_OACTIVE; 3546 } 3547 _IF_ENQUEUE(ifq, m); 3548 IF_UNLOCK(ifq); 3549 if (ifp != NULL && !active) 3550 (*(ifp)->if_start)(ifp); 3551 return (1); 3552 } 3553 3554 void 3555 if_register_com_alloc(u_char type, 3556 if_com_alloc_t *a, if_com_free_t *f) 3557 { 3558 3559 KASSERT(if_com_alloc[type] == NULL, 3560 ("if_register_com_alloc: %d already registered", type)); 3561 KASSERT(if_com_free[type] == NULL, 3562 ("if_register_com_alloc: %d free already registered", type)); 3563 3564 if_com_alloc[type] = a; 3565 if_com_free[type] = f; 3566 } 3567 3568 void 3569 if_deregister_com_alloc(u_char type) 3570 { 3571 3572 KASSERT(if_com_alloc[type] != NULL, 3573 ("if_deregister_com_alloc: %d not registered", type)); 3574 KASSERT(if_com_free[type] != NULL, 3575 ("if_deregister_com_alloc: %d free not registered", type)); 3576 if_com_alloc[type] = NULL; 3577 if_com_free[type] = NULL; 3578 } 3579 3580 /* API for driver access to network stack owned ifnet.*/ 3581 uint64_t 3582 if_setbaudrate(struct ifnet *ifp, uint64_t baudrate) 3583 { 3584 uint64_t oldbrate; 3585 3586 oldbrate = ifp->if_baudrate; 3587 ifp->if_baudrate = baudrate; 3588 return (oldbrate); 3589 } 3590 3591 uint64_t 3592 if_getbaudrate(if_t ifp) 3593 { 3594 3595 return (((struct ifnet *)ifp)->if_baudrate); 3596 } 3597 3598 int 3599 if_setcapabilities(if_t ifp, int capabilities) 3600 { 3601 ((struct ifnet *)ifp)->if_capabilities = capabilities; 3602 return (0); 3603 } 3604 3605 int 3606 if_setcapabilitiesbit(if_t ifp, int setbit, int clearbit) 3607 { 3608 ((struct ifnet *)ifp)->if_capabilities |= setbit; 3609 ((struct ifnet *)ifp)->if_capabilities &= ~clearbit; 3610 3611 return (0); 3612 } 3613 3614 int 3615 if_getcapabilities(if_t ifp) 3616 { 3617 return ((struct ifnet *)ifp)->if_capabilities; 3618 } 3619 3620 int 3621 if_setcapenable(if_t ifp, int capabilities) 3622 { 3623 ((struct ifnet *)ifp)->if_capenable = capabilities; 3624 return (0); 3625 } 3626 3627 int 3628 if_setcapenablebit(if_t ifp, int setcap, int clearcap) 3629 { 3630 if(setcap) 3631 ((struct ifnet *)ifp)->if_capenable |= setcap; 3632 if(clearcap) 3633 ((struct ifnet *)ifp)->if_capenable &= ~clearcap; 3634 3635 return (0); 3636 } 3637 3638 const char * 3639 if_getdname(if_t ifp) 3640 { 3641 return ((struct ifnet *)ifp)->if_dname; 3642 } 3643 3644 int 3645 if_togglecapenable(if_t ifp, int togglecap) 3646 { 3647 ((struct ifnet *)ifp)->if_capenable ^= togglecap; 3648 return (0); 3649 } 3650 3651 int 3652 if_getcapenable(if_t ifp) 3653 { 3654 return ((struct ifnet *)ifp)->if_capenable; 3655 } 3656 3657 /* 3658 * This is largely undesirable because it ties ifnet to a device, but does 3659 * provide flexiblity for an embedded product vendor. Should be used with 3660 * the understanding that it violates the interface boundaries, and should be 3661 * a last resort only. 3662 */ 3663 int 3664 if_setdev(if_t ifp, void *dev) 3665 { 3666 return (0); 3667 } 3668 3669 int 3670 if_setdrvflagbits(if_t ifp, int set_flags, int clear_flags) 3671 { 3672 ((struct ifnet *)ifp)->if_drv_flags |= set_flags; 3673 ((struct ifnet *)ifp)->if_drv_flags &= ~clear_flags; 3674 3675 return (0); 3676 } 3677 3678 int 3679 if_getdrvflags(if_t ifp) 3680 { 3681 return ((struct ifnet *)ifp)->if_drv_flags; 3682 } 3683 3684 int 3685 if_setdrvflags(if_t ifp, int flags) 3686 { 3687 ((struct ifnet *)ifp)->if_drv_flags = flags; 3688 return (0); 3689 } 3690 3691 3692 int 3693 if_setflags(if_t ifp, int flags) 3694 { 3695 ((struct ifnet *)ifp)->if_flags = flags; 3696 return (0); 3697 } 3698 3699 int 3700 if_setflagbits(if_t ifp, int set, int clear) 3701 { 3702 ((struct ifnet *)ifp)->if_flags |= set; 3703 ((struct ifnet *)ifp)->if_flags &= ~clear; 3704 3705 return (0); 3706 } 3707 3708 int 3709 if_getflags(if_t ifp) 3710 { 3711 return ((struct ifnet *)ifp)->if_flags; 3712 } 3713 3714 int 3715 if_clearhwassist(if_t ifp) 3716 { 3717 ((struct ifnet *)ifp)->if_hwassist = 0; 3718 return (0); 3719 } 3720 3721 int 3722 if_sethwassistbits(if_t ifp, int toset, int toclear) 3723 { 3724 ((struct ifnet *)ifp)->if_hwassist |= toset; 3725 ((struct ifnet *)ifp)->if_hwassist &= ~toclear; 3726 3727 return (0); 3728 } 3729 3730 int 3731 if_sethwassist(if_t ifp, int hwassist_bit) 3732 { 3733 ((struct ifnet *)ifp)->if_hwassist = hwassist_bit; 3734 return (0); 3735 } 3736 3737 int 3738 if_gethwassist(if_t ifp) 3739 { 3740 return ((struct ifnet *)ifp)->if_hwassist; 3741 } 3742 3743 int 3744 if_setmtu(if_t ifp, int mtu) 3745 { 3746 ((struct ifnet *)ifp)->if_mtu = mtu; 3747 return (0); 3748 } 3749 3750 int 3751 if_getmtu(if_t ifp) 3752 { 3753 return ((struct ifnet *)ifp)->if_mtu; 3754 } 3755 3756 int 3757 if_getmtu_family(if_t ifp, int family) 3758 { 3759 struct domain *dp; 3760 3761 for (dp = domains; dp; dp = dp->dom_next) { 3762 if (dp->dom_family == family && dp->dom_ifmtu != NULL) 3763 return (dp->dom_ifmtu((struct ifnet *)ifp)); 3764 } 3765 3766 return (((struct ifnet *)ifp)->if_mtu); 3767 } 3768 3769 int 3770 if_setsoftc(if_t ifp, void *softc) 3771 { 3772 ((struct ifnet *)ifp)->if_softc = softc; 3773 return (0); 3774 } 3775 3776 void * 3777 if_getsoftc(if_t ifp) 3778 { 3779 return ((struct ifnet *)ifp)->if_softc; 3780 } 3781 3782 void 3783 if_setrcvif(struct mbuf *m, if_t ifp) 3784 { 3785 m->m_pkthdr.rcvif = (struct ifnet *)ifp; 3786 } 3787 3788 void 3789 if_setvtag(struct mbuf *m, uint16_t tag) 3790 { 3791 m->m_pkthdr.ether_vtag = tag; 3792 } 3793 3794 uint16_t 3795 if_getvtag(struct mbuf *m) 3796 { 3797 3798 return (m->m_pkthdr.ether_vtag); 3799 } 3800 3801 int 3802 if_sendq_empty(if_t ifp) 3803 { 3804 return IFQ_DRV_IS_EMPTY(&((struct ifnet *)ifp)->if_snd); 3805 } 3806 3807 struct ifaddr * 3808 if_getifaddr(if_t ifp) 3809 { 3810 return ((struct ifnet *)ifp)->if_addr; 3811 } 3812 3813 int 3814 if_getamcount(if_t ifp) 3815 { 3816 return ((struct ifnet *)ifp)->if_amcount; 3817 } 3818 3819 3820 int 3821 if_setsendqready(if_t ifp) 3822 { 3823 IFQ_SET_READY(&((struct ifnet *)ifp)->if_snd); 3824 return (0); 3825 } 3826 3827 int 3828 if_setsendqlen(if_t ifp, int tx_desc_count) 3829 { 3830 IFQ_SET_MAXLEN(&((struct ifnet *)ifp)->if_snd, tx_desc_count); 3831 ((struct ifnet *)ifp)->if_snd.ifq_drv_maxlen = tx_desc_count; 3832 3833 return (0); 3834 } 3835 3836 int 3837 if_vlantrunkinuse(if_t ifp) 3838 { 3839 return ((struct ifnet *)ifp)->if_vlantrunk != NULL?1:0; 3840 } 3841 3842 int 3843 if_input(if_t ifp, struct mbuf* sendmp) 3844 { 3845 (*((struct ifnet *)ifp)->if_input)((struct ifnet *)ifp, sendmp); 3846 return (0); 3847 3848 } 3849 3850 /* XXX */ 3851 #ifndef ETH_ADDR_LEN 3852 #define ETH_ADDR_LEN 6 3853 #endif 3854 3855 int 3856 if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max) 3857 { 3858 struct ifmultiaddr *ifma; 3859 uint8_t *lmta = (uint8_t *)mta; 3860 int mcnt = 0; 3861 3862 TAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 3863 if (ifma->ifma_addr->sa_family != AF_LINK) 3864 continue; 3865 3866 if (mcnt == max) 3867 break; 3868 3869 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 3870 &lmta[mcnt * ETH_ADDR_LEN], ETH_ADDR_LEN); 3871 mcnt++; 3872 } 3873 *cnt = mcnt; 3874 3875 return (0); 3876 } 3877 3878 int 3879 if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max) 3880 { 3881 int error; 3882 3883 if_maddr_rlock(ifp); 3884 error = if_setupmultiaddr(ifp, mta, cnt, max); 3885 if_maddr_runlock(ifp); 3886 return (error); 3887 } 3888 3889 int 3890 if_multiaddr_count(if_t ifp, int max) 3891 { 3892 struct ifmultiaddr *ifma; 3893 int count; 3894 3895 count = 0; 3896 if_maddr_rlock(ifp); 3897 TAILQ_FOREACH(ifma, &((struct ifnet *)ifp)->if_multiaddrs, ifma_link) { 3898 if (ifma->ifma_addr->sa_family != AF_LINK) 3899 continue; 3900 count++; 3901 if (count == max) 3902 break; 3903 } 3904 if_maddr_runlock(ifp); 3905 return (count); 3906 } 3907 3908 struct mbuf * 3909 if_dequeue(if_t ifp) 3910 { 3911 struct mbuf *m; 3912 IFQ_DRV_DEQUEUE(&((struct ifnet *)ifp)->if_snd, m); 3913 3914 return (m); 3915 } 3916 3917 int 3918 if_sendq_prepend(if_t ifp, struct mbuf *m) 3919 { 3920 IFQ_DRV_PREPEND(&((struct ifnet *)ifp)->if_snd, m); 3921 return (0); 3922 } 3923 3924 int 3925 if_setifheaderlen(if_t ifp, int len) 3926 { 3927 ((struct ifnet *)ifp)->if_hdrlen = len; 3928 return (0); 3929 } 3930 3931 caddr_t 3932 if_getlladdr(if_t ifp) 3933 { 3934 return (IF_LLADDR((struct ifnet *)ifp)); 3935 } 3936 3937 void * 3938 if_gethandle(u_char type) 3939 { 3940 return (if_alloc(type)); 3941 } 3942 3943 void 3944 if_bpfmtap(if_t ifh, struct mbuf *m) 3945 { 3946 struct ifnet *ifp = (struct ifnet *)ifh; 3947 3948 BPF_MTAP(ifp, m); 3949 } 3950 3951 void 3952 if_etherbpfmtap(if_t ifh, struct mbuf *m) 3953 { 3954 struct ifnet *ifp = (struct ifnet *)ifh; 3955 3956 ETHER_BPF_MTAP(ifp, m); 3957 } 3958 3959 void 3960 if_vlancap(if_t ifh) 3961 { 3962 struct ifnet *ifp = (struct ifnet *)ifh; 3963 VLAN_CAPABILITIES(ifp); 3964 } 3965 3966 void 3967 if_setinitfn(if_t ifp, void (*init_fn)(void *)) 3968 { 3969 ((struct ifnet *)ifp)->if_init = init_fn; 3970 } 3971 3972 void 3973 if_setioctlfn(if_t ifp, int (*ioctl_fn)(if_t, u_long, caddr_t)) 3974 { 3975 ((struct ifnet *)ifp)->if_ioctl = (void *)ioctl_fn; 3976 } 3977 3978 void 3979 if_setstartfn(if_t ifp, void (*start_fn)(if_t)) 3980 { 3981 ((struct ifnet *)ifp)->if_start = (void *)start_fn; 3982 } 3983 3984 void 3985 if_settransmitfn(if_t ifp, if_transmit_fn_t start_fn) 3986 { 3987 ((struct ifnet *)ifp)->if_transmit = start_fn; 3988 } 3989 3990 void if_setqflushfn(if_t ifp, if_qflush_fn_t flush_fn) 3991 { 3992 ((struct ifnet *)ifp)->if_qflush = flush_fn; 3993 3994 } 3995 3996 void 3997 if_setgetcounterfn(if_t ifp, if_get_counter_t fn) 3998 { 3999 4000 ifp->if_get_counter = fn; 4001 } 4002 4003 /* Revisit these - These are inline functions originally. */ 4004 int 4005 drbr_inuse_drv(if_t ifh, struct buf_ring *br) 4006 { 4007 return drbr_inuse_drv(ifh, br); 4008 } 4009 4010 struct mbuf* 4011 drbr_dequeue_drv(if_t ifh, struct buf_ring *br) 4012 { 4013 return drbr_dequeue(ifh, br); 4014 } 4015 4016 int 4017 drbr_needs_enqueue_drv(if_t ifh, struct buf_ring *br) 4018 { 4019 return drbr_needs_enqueue(ifh, br); 4020 } 4021 4022 int 4023 drbr_enqueue_drv(if_t ifh, struct buf_ring *br, struct mbuf *m) 4024 { 4025 return drbr_enqueue(ifh, br, m); 4026 4027 } 4028