if_vlan.c revision 204149
1/*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/sys/net/if_vlan.c 204149 2010-02-20 22:47:20Z yongari $ 30 */ 31 32/* 33 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. 34 * Might be extended some day to also handle IEEE 802.1p priority 35 * tagging. This is sort of sneaky in the implementation, since 36 * we need to pretend to be enough of an Ethernet implementation 37 * to make arp work. The way we do this is by telling everyone 38 * that we are an Ethernet, and then catch the packets that 39 * ether_output() left on our output queue when it calls 40 * if_start(), rewrite them for use by the real outgoing interface, 41 * and ask it to send them. 42 */ 43 44#include "opt_vlan.h" 45 46#include <sys/param.h> 47#include <sys/kernel.h> 48#include <sys/lock.h> 49#include <sys/malloc.h> 50#include <sys/mbuf.h> 51#include <sys/module.h> 52#include <sys/rwlock.h> 53#include <sys/queue.h> 54#include <sys/socket.h> 55#include <sys/sockio.h> 56#include <sys/sysctl.h> 57#include <sys/systm.h> 58 59#include <net/bpf.h> 60#include <net/ethernet.h> 61#include <net/if.h> 62#include <net/if_clone.h> 63#include <net/if_dl.h> 64#include <net/if_types.h> 65#include <net/if_vlan_var.h> 66#include <net/vnet.h> 67 68#define VLANNAME "vlan" 69#define VLAN_DEF_HWIDTH 4 70#define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 71 72#define UP_AND_RUNNING(ifp) \ 73 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 74 75LIST_HEAD(ifvlanhead, ifvlan); 76 77struct ifvlantrunk { 78 struct ifnet *parent; /* parent interface of this trunk */ 79 struct rwlock rw; 80#ifdef VLAN_ARRAY 81#define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 82 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 83#else 84 struct ifvlanhead *hash; /* dynamic hash-list table */ 85 uint16_t hmask; 86 uint16_t hwidth; 87#endif 88 int refcnt; 89}; 90 91struct vlan_mc_entry { 92 struct ether_addr mc_addr; 93 SLIST_ENTRY(vlan_mc_entry) mc_entries; 94}; 95 96struct ifvlan { 97 struct ifvlantrunk *ifv_trunk; 98 struct ifnet *ifv_ifp; 99#define TRUNK(ifv) ((ifv)->ifv_trunk) 100#define PARENT(ifv) ((ifv)->ifv_trunk->parent) 101 int ifv_pflags; /* special flags we have set on parent */ 102 struct ifv_linkmib { 103 int ifvm_encaplen; /* encapsulation length */ 104 int ifvm_mtufudge; /* MTU fudged by this much */ 105 int ifvm_mintu; /* min transmission unit */ 106 uint16_t ifvm_proto; /* encapsulation ethertype */ 107 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 108 } ifv_mib; 109 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 110#ifndef VLAN_ARRAY 111 LIST_ENTRY(ifvlan) ifv_list; 112#endif 113}; 114#define ifv_proto ifv_mib.ifvm_proto 115#define ifv_tag ifv_mib.ifvm_tag 116#define ifv_encaplen ifv_mib.ifvm_encaplen 117#define ifv_mtufudge ifv_mib.ifvm_mtufudge 118#define ifv_mintu ifv_mib.ifvm_mintu 119 120/* Special flags we should propagate to parent. */ 121static struct { 122 int flag; 123 int (*func)(struct ifnet *, int); 124} vlan_pflags[] = { 125 {IFF_PROMISC, ifpromisc}, 126 {IFF_ALLMULTI, if_allmulti}, 127 {0, NULL} 128}; 129 130SYSCTL_DECL(_net_link); 131SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 132SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 133 134static int soft_pad = 0; 135SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 136 "pad short frames before tagging"); 137 138static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 139 140static eventhandler_tag ifdetach_tag; 141static eventhandler_tag iflladdr_tag; 142 143/* 144 * We have a global mutex, that is used to serialize configuration 145 * changes and isn't used in normal packet delivery. 146 * 147 * We also have a per-trunk rwlock, that is locked shared on packet 148 * processing and exclusive when configuration is changed. 149 * 150 * The VLAN_ARRAY substitutes the dynamic hash with a static array 151 * with 4096 entries. In theory this can give a boost in processing, 152 * however on practice it does not. Probably this is because array 153 * is too big to fit into CPU cache. 154 */ 155static struct mtx ifv_mtx; 156#define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 157#define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 158#define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 159#define VLAN_LOCK() mtx_lock(&ifv_mtx) 160#define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 161#define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 162#define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 163#define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 164#define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 165#define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 166#define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 167#define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 168#define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 169 170#ifndef VLAN_ARRAY 171static void vlan_inithash(struct ifvlantrunk *trunk); 172static void vlan_freehash(struct ifvlantrunk *trunk); 173static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 174static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 175static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 176static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 177 uint16_t tag); 178#endif 179static void trunk_destroy(struct ifvlantrunk *trunk); 180 181static void vlan_start(struct ifnet *ifp); 182static void vlan_init(void *foo); 183static void vlan_input(struct ifnet *ifp, struct mbuf *m); 184static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 185static int vlan_setflag(struct ifnet *ifp, int flag, int status, 186 int (*func)(struct ifnet *, int)); 187static int vlan_setflags(struct ifnet *ifp, int status); 188static int vlan_setmulti(struct ifnet *ifp); 189static int vlan_unconfig(struct ifnet *ifp); 190static int vlan_unconfig_locked(struct ifnet *ifp); 191static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 192static void vlan_link_state(struct ifnet *ifp); 193static void vlan_capabilities(struct ifvlan *ifv); 194static void vlan_trunk_capabilities(struct ifnet *ifp); 195 196static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 197 const char *, int *); 198static int vlan_clone_match(struct if_clone *, const char *); 199static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 200static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 201 202static void vlan_ifdetach(void *arg, struct ifnet *ifp); 203static void vlan_iflladdr(void *arg, struct ifnet *ifp); 204 205static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 206 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 207 208#ifndef VLAN_ARRAY 209#define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 210 211static void 212vlan_inithash(struct ifvlantrunk *trunk) 213{ 214 int i, n; 215 216 /* 217 * The trunk must not be locked here since we call malloc(M_WAITOK). 218 * It is OK in case this function is called before the trunk struct 219 * gets hooked up and becomes visible from other threads. 220 */ 221 222 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 223 ("%s: hash already initialized", __func__)); 224 225 trunk->hwidth = VLAN_DEF_HWIDTH; 226 n = 1 << trunk->hwidth; 227 trunk->hmask = n - 1; 228 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 229 for (i = 0; i < n; i++) 230 LIST_INIT(&trunk->hash[i]); 231} 232 233static void 234vlan_freehash(struct ifvlantrunk *trunk) 235{ 236#ifdef INVARIANTS 237 int i; 238 239 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 240 for (i = 0; i < (1 << trunk->hwidth); i++) 241 KASSERT(LIST_EMPTY(&trunk->hash[i]), 242 ("%s: hash table not empty", __func__)); 243#endif 244 free(trunk->hash, M_VLAN); 245 trunk->hash = NULL; 246 trunk->hwidth = trunk->hmask = 0; 247} 248 249static int 250vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 251{ 252 int i, b; 253 struct ifvlan *ifv2; 254 255 TRUNK_LOCK_ASSERT(trunk); 256 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 257 258 b = 1 << trunk->hwidth; 259 i = HASH(ifv->ifv_tag, trunk->hmask); 260 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 261 if (ifv->ifv_tag == ifv2->ifv_tag) 262 return (EEXIST); 263 264 /* 265 * Grow the hash when the number of vlans exceeds half of the number of 266 * hash buckets squared. This will make the average linked-list length 267 * buckets/2. 268 */ 269 if (trunk->refcnt > (b * b) / 2) { 270 vlan_growhash(trunk, 1); 271 i = HASH(ifv->ifv_tag, trunk->hmask); 272 } 273 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 274 trunk->refcnt++; 275 276 return (0); 277} 278 279static int 280vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 281{ 282 int i, b; 283 struct ifvlan *ifv2; 284 285 TRUNK_LOCK_ASSERT(trunk); 286 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 287 288 b = 1 << trunk->hwidth; 289 i = HASH(ifv->ifv_tag, trunk->hmask); 290 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 291 if (ifv2 == ifv) { 292 trunk->refcnt--; 293 LIST_REMOVE(ifv2, ifv_list); 294 if (trunk->refcnt < (b * b) / 2) 295 vlan_growhash(trunk, -1); 296 return (0); 297 } 298 299 panic("%s: vlan not found\n", __func__); 300 return (ENOENT); /*NOTREACHED*/ 301} 302 303/* 304 * Grow the hash larger or smaller if memory permits. 305 */ 306static void 307vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 308{ 309 struct ifvlan *ifv; 310 struct ifvlanhead *hash2; 311 int hwidth2, i, j, n, n2; 312 313 TRUNK_LOCK_ASSERT(trunk); 314 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 315 316 if (howmuch == 0) { 317 /* Harmless yet obvious coding error */ 318 printf("%s: howmuch is 0\n", __func__); 319 return; 320 } 321 322 hwidth2 = trunk->hwidth + howmuch; 323 n = 1 << trunk->hwidth; 324 n2 = 1 << hwidth2; 325 /* Do not shrink the table below the default */ 326 if (hwidth2 < VLAN_DEF_HWIDTH) 327 return; 328 329 /* M_NOWAIT because we're called with trunk mutex held */ 330 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 331 if (hash2 == NULL) { 332 printf("%s: out of memory -- hash size not changed\n", 333 __func__); 334 return; /* We can live with the old hash table */ 335 } 336 for (j = 0; j < n2; j++) 337 LIST_INIT(&hash2[j]); 338 for (i = 0; i < n; i++) 339 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 340 LIST_REMOVE(ifv, ifv_list); 341 j = HASH(ifv->ifv_tag, n2 - 1); 342 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 343 } 344 free(trunk->hash, M_VLAN); 345 trunk->hash = hash2; 346 trunk->hwidth = hwidth2; 347 trunk->hmask = n2 - 1; 348 349 if (bootverbose) 350 if_printf(trunk->parent, 351 "VLAN hash table resized from %d to %d buckets\n", n, n2); 352} 353 354static __inline struct ifvlan * 355vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 356{ 357 struct ifvlan *ifv; 358 359 TRUNK_LOCK_RASSERT(trunk); 360 361 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 362 if (ifv->ifv_tag == tag) 363 return (ifv); 364 return (NULL); 365} 366 367#if 0 368/* Debugging code to view the hashtables. */ 369static void 370vlan_dumphash(struct ifvlantrunk *trunk) 371{ 372 int i; 373 struct ifvlan *ifv; 374 375 for (i = 0; i < (1 << trunk->hwidth); i++) { 376 printf("%d: ", i); 377 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 378 printf("%s ", ifv->ifv_ifp->if_xname); 379 printf("\n"); 380 } 381} 382#endif /* 0 */ 383#endif /* !VLAN_ARRAY */ 384 385static void 386trunk_destroy(struct ifvlantrunk *trunk) 387{ 388 VLAN_LOCK_ASSERT(); 389 390 TRUNK_LOCK(trunk); 391#ifndef VLAN_ARRAY 392 vlan_freehash(trunk); 393#endif 394 trunk->parent->if_vlantrunk = NULL; 395 TRUNK_UNLOCK(trunk); 396 TRUNK_LOCK_DESTROY(trunk); 397 free(trunk, M_VLAN); 398} 399 400/* 401 * Program our multicast filter. What we're actually doing is 402 * programming the multicast filter of the parent. This has the 403 * side effect of causing the parent interface to receive multicast 404 * traffic that it doesn't really want, which ends up being discarded 405 * later by the upper protocol layers. Unfortunately, there's no way 406 * to avoid this: there really is only one physical interface. 407 * 408 * XXX: There is a possible race here if more than one thread is 409 * modifying the multicast state of the vlan interface at the same time. 410 */ 411static int 412vlan_setmulti(struct ifnet *ifp) 413{ 414 struct ifnet *ifp_p; 415 struct ifmultiaddr *ifma, *rifma = NULL; 416 struct ifvlan *sc; 417 struct vlan_mc_entry *mc; 418 struct sockaddr_dl sdl; 419 int error; 420 421 /*VLAN_LOCK_ASSERT();*/ 422 423 /* Find the parent. */ 424 sc = ifp->if_softc; 425 ifp_p = PARENT(sc); 426 427 CURVNET_SET_QUIET(ifp_p->if_vnet); 428 429 bzero((char *)&sdl, sizeof(sdl)); 430 sdl.sdl_len = sizeof(sdl); 431 sdl.sdl_family = AF_LINK; 432 sdl.sdl_index = ifp_p->if_index; 433 sdl.sdl_type = IFT_ETHER; 434 sdl.sdl_alen = ETHER_ADDR_LEN; 435 436 /* First, remove any existing filter entries. */ 437 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 438 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 439 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 440 if (error) 441 return (error); 442 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 443 free(mc, M_VLAN); 444 } 445 446 /* Now program new ones. */ 447 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 448 if (ifma->ifma_addr->sa_family != AF_LINK) 449 continue; 450 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 451 if (mc == NULL) 452 return (ENOMEM); 453 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 454 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 455 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 456 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 457 LLADDR(&sdl), ETHER_ADDR_LEN); 458 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 459 if (error) 460 return (error); 461 } 462 463 CURVNET_RESTORE(); 464 return (0); 465} 466 467/* 468 * A handler for parent interface link layer address changes. 469 * If the parent interface link layer address is changed we 470 * should also change it on all children vlans. 471 */ 472static void 473vlan_iflladdr(void *arg __unused, struct ifnet *ifp) 474{ 475 struct ifvlan *ifv; 476#ifndef VLAN_ARRAY 477 struct ifvlan *next; 478#endif 479 int i; 480 481 /* 482 * Check if it's a trunk interface first of all 483 * to avoid needless locking. 484 */ 485 if (ifp->if_vlantrunk == NULL) 486 return; 487 488 VLAN_LOCK(); 489 /* 490 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it. 491 */ 492#ifdef VLAN_ARRAY 493 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 494 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 495#else /* VLAN_ARRAY */ 496 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 497 LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) { 498#endif /* VLAN_ARRAY */ 499 VLAN_UNLOCK(); 500 if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), ETHER_ADDR_LEN); 501 VLAN_LOCK(); 502 } 503 VLAN_UNLOCK(); 504 505} 506 507/* 508 * A handler for network interface departure events. 509 * Track departure of trunks here so that we don't access invalid 510 * pointers or whatever if a trunk is ripped from under us, e.g., 511 * by ejecting its hot-plug card. However, if an ifnet is simply 512 * being renamed, then there's no need to tear down the state. 513 */ 514static void 515vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 516{ 517 struct ifvlan *ifv; 518 int i; 519 520 /* 521 * Check if it's a trunk interface first of all 522 * to avoid needless locking. 523 */ 524 if (ifp->if_vlantrunk == NULL) 525 return; 526 527 /* If the ifnet is just being renamed, don't do anything. */ 528 if (ifp->if_flags & IFF_RENAMING) 529 return; 530 531 VLAN_LOCK(); 532 /* 533 * OK, it's a trunk. Loop over and detach all vlan's on it. 534 * Check trunk pointer after each vlan_unconfig() as it will 535 * free it and set to NULL after the last vlan was detached. 536 */ 537#ifdef VLAN_ARRAY 538 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 539 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 540 vlan_unconfig_locked(ifv->ifv_ifp); 541 if (ifp->if_vlantrunk == NULL) 542 break; 543 } 544#else /* VLAN_ARRAY */ 545restart: 546 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 547 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 548 vlan_unconfig_locked(ifv->ifv_ifp); 549 if (ifp->if_vlantrunk) 550 goto restart; /* trunk->hwidth can change */ 551 else 552 break; 553 } 554#endif /* VLAN_ARRAY */ 555 /* Trunk should have been destroyed in vlan_unconfig(). */ 556 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 557 VLAN_UNLOCK(); 558} 559 560/* 561 * VLAN support can be loaded as a module. The only place in the 562 * system that's intimately aware of this is ether_input. We hook 563 * into this code through vlan_input_p which is defined there and 564 * set here. Noone else in the system should be aware of this so 565 * we use an explicit reference here. 566 */ 567extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 568 569/* For if_link_state_change() eyes only... */ 570extern void (*vlan_link_state_p)(struct ifnet *); 571 572static int 573vlan_modevent(module_t mod, int type, void *data) 574{ 575 576 switch (type) { 577 case MOD_LOAD: 578 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 579 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 580 if (ifdetach_tag == NULL) 581 return (ENOMEM); 582 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 583 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 584 if (iflladdr_tag == NULL) 585 return (ENOMEM); 586 VLAN_LOCK_INIT(); 587 vlan_input_p = vlan_input; 588 vlan_link_state_p = vlan_link_state; 589 vlan_trunk_cap_p = vlan_trunk_capabilities; 590 if_clone_attach(&vlan_cloner); 591 if (bootverbose) 592 printf("vlan: initialized, using " 593#ifdef VLAN_ARRAY 594 "full-size arrays" 595#else 596 "hash tables with chaining" 597#endif 598 599 "\n"); 600 break; 601 case MOD_UNLOAD: 602 if_clone_detach(&vlan_cloner); 603 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 604 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag); 605 vlan_input_p = NULL; 606 vlan_link_state_p = NULL; 607 vlan_trunk_cap_p = NULL; 608 VLAN_LOCK_DESTROY(); 609 if (bootverbose) 610 printf("vlan: unloaded\n"); 611 break; 612 default: 613 return (EOPNOTSUPP); 614 } 615 return (0); 616} 617 618static moduledata_t vlan_mod = { 619 "if_vlan", 620 vlan_modevent, 621 0 622}; 623 624DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 625MODULE_VERSION(if_vlan, 3); 626 627static struct ifnet * 628vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 629{ 630 const char *cp; 631 struct ifnet *ifp; 632 int t; 633 634 /* Check for <etherif>.<vlan> style interface names. */ 635 IFNET_RLOCK_NOSLEEP(); 636 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 637 if (ifp->if_type != IFT_ETHER) 638 continue; 639 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 640 continue; 641 cp = name + strlen(ifp->if_xname); 642 if (*cp++ != '.') 643 continue; 644 if (*cp == '\0') 645 continue; 646 t = 0; 647 for(; *cp >= '0' && *cp <= '9'; cp++) 648 t = (t * 10) + (*cp - '0'); 649 if (*cp != '\0') 650 continue; 651 if (tag != NULL) 652 *tag = t; 653 break; 654 } 655 IFNET_RUNLOCK_NOSLEEP(); 656 657 return (ifp); 658} 659 660static int 661vlan_clone_match(struct if_clone *ifc, const char *name) 662{ 663 const char *cp; 664 665 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 666 return (1); 667 668 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 669 return (0); 670 for (cp = name + 4; *cp != '\0'; cp++) { 671 if (*cp < '0' || *cp > '9') 672 return (0); 673 } 674 675 return (1); 676} 677 678static int 679vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 680{ 681 char *dp; 682 int wildcard; 683 int unit; 684 int error; 685 int tag; 686 int ethertag; 687 struct ifvlan *ifv; 688 struct ifnet *ifp; 689 struct ifnet *p; 690 struct vlanreq vlr; 691 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 692 693 /* 694 * There are 3 (ugh) ways to specify the cloned device: 695 * o pass a parameter block with the clone request. 696 * o specify parameters in the text of the clone device name 697 * o specify no parameters and get an unattached device that 698 * must be configured separately. 699 * The first technique is preferred; the latter two are 700 * supported for backwards compatibilty. 701 */ 702 if (params) { 703 error = copyin(params, &vlr, sizeof(vlr)); 704 if (error) 705 return error; 706 p = ifunit(vlr.vlr_parent); 707 if (p == NULL) 708 return ENXIO; 709 /* 710 * Don't let the caller set up a VLAN tag with 711 * anything except VLID bits. 712 */ 713 if (vlr.vlr_tag & ~EVL_VLID_MASK) 714 return (EINVAL); 715 error = ifc_name2unit(name, &unit); 716 if (error != 0) 717 return (error); 718 719 ethertag = 1; 720 tag = vlr.vlr_tag; 721 wildcard = (unit < 0); 722 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 723 ethertag = 1; 724 unit = -1; 725 wildcard = 0; 726 727 /* 728 * Don't let the caller set up a VLAN tag with 729 * anything except VLID bits. 730 */ 731 if (tag & ~EVL_VLID_MASK) 732 return (EINVAL); 733 } else { 734 ethertag = 0; 735 736 error = ifc_name2unit(name, &unit); 737 if (error != 0) 738 return (error); 739 740 wildcard = (unit < 0); 741 } 742 743 error = ifc_alloc_unit(ifc, &unit); 744 if (error != 0) 745 return (error); 746 747 /* In the wildcard case, we need to update the name. */ 748 if (wildcard) { 749 for (dp = name; *dp != '\0'; dp++); 750 if (snprintf(dp, len - (dp-name), "%d", unit) > 751 len - (dp-name) - 1) { 752 panic("%s: interface name too long", __func__); 753 } 754 } 755 756 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 757 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 758 if (ifp == NULL) { 759 ifc_free_unit(ifc, unit); 760 free(ifv, M_VLAN); 761 return (ENOSPC); 762 } 763 SLIST_INIT(&ifv->vlan_mc_listhead); 764 765 ifp->if_softc = ifv; 766 /* 767 * Set the name manually rather than using if_initname because 768 * we don't conform to the default naming convention for interfaces. 769 */ 770 strlcpy(ifp->if_xname, name, IFNAMSIZ); 771 ifp->if_dname = ifc->ifc_name; 772 ifp->if_dunit = unit; 773 /* NB: flags are not set here */ 774 ifp->if_linkmib = &ifv->ifv_mib; 775 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 776 /* NB: mtu is not set here */ 777 778 ifp->if_init = vlan_init; 779 ifp->if_start = vlan_start; 780 ifp->if_ioctl = vlan_ioctl; 781 ifp->if_snd.ifq_maxlen = ifqmaxlen; 782 ifp->if_flags = VLAN_IFFLAGS; 783 ether_ifattach(ifp, eaddr); 784 /* Now undo some of the damage... */ 785 ifp->if_baudrate = 0; 786 ifp->if_type = IFT_L2VLAN; 787 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 788 789 if (ethertag) { 790 error = vlan_config(ifv, p, tag); 791 if (error != 0) { 792 /* 793 * Since we've partialy failed, we need to back 794 * out all the way, otherwise userland could get 795 * confused. Thus, we destroy the interface. 796 */ 797 ether_ifdetach(ifp); 798 vlan_unconfig(ifp); 799 if_free_type(ifp, IFT_ETHER); 800 ifc_free_unit(ifc, unit); 801 free(ifv, M_VLAN); 802 803 return (error); 804 } 805 806 /* Update flags on the parent, if necessary. */ 807 vlan_setflags(ifp, 1); 808 } 809 810 return (0); 811} 812 813static int 814vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 815{ 816 struct ifvlan *ifv = ifp->if_softc; 817 int unit = ifp->if_dunit; 818 819 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 820 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 821 if_free_type(ifp, IFT_ETHER); 822 free(ifv, M_VLAN); 823 ifc_free_unit(ifc, unit); 824 825 return (0); 826} 827 828/* 829 * The ifp->if_init entry point for vlan(4) is a no-op. 830 */ 831static void 832vlan_init(void *foo __unused) 833{ 834} 835 836/* 837 * The if_start method for vlan(4) interface. It doesn't 838 * raises the IFF_DRV_OACTIVE flag, since it is called 839 * only from IFQ_HANDOFF() macro in ether_output_frame(). 840 * If the interface queue is full, and vlan_start() is 841 * not called, the queue would never get emptied and 842 * interface would stall forever. 843 */ 844static void 845vlan_start(struct ifnet *ifp) 846{ 847 struct ifvlan *ifv; 848 struct ifnet *p; 849 struct mbuf *m; 850 int error; 851 852 ifv = ifp->if_softc; 853 p = PARENT(ifv); 854 855 for (;;) { 856 IF_DEQUEUE(&ifp->if_snd, m); 857 if (m == NULL) 858 break; 859 BPF_MTAP(ifp, m); 860 861 /* 862 * Do not run parent's if_start() if the parent is not up, 863 * or parent's driver will cause a system crash. 864 */ 865 if (!UP_AND_RUNNING(p)) { 866 m_freem(m); 867 ifp->if_collisions++; 868 continue; 869 } 870 871 /* 872 * Pad the frame to the minimum size allowed if told to. 873 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 874 * paragraph C.4.4.3.b. It can help to work around buggy 875 * bridges that violate paragraph C.4.4.3.a from the same 876 * document, i.e., fail to pad short frames after untagging. 877 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 878 * untagging it will produce a 62-byte frame, which is a runt 879 * and requires padding. There are VLAN-enabled network 880 * devices that just discard such runts instead or mishandle 881 * them somehow. 882 */ 883 if (soft_pad) { 884 static char pad[8]; /* just zeros */ 885 int n; 886 887 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 888 n > 0; n -= sizeof(pad)) 889 if (!m_append(m, min(n, sizeof(pad)), pad)) 890 break; 891 892 if (n > 0) { 893 if_printf(ifp, "cannot pad short frame\n"); 894 ifp->if_oerrors++; 895 m_freem(m); 896 continue; 897 } 898 } 899 900 /* 901 * If underlying interface can do VLAN tag insertion itself, 902 * just pass the packet along. However, we need some way to 903 * tell the interface where the packet came from so that it 904 * knows how to find the VLAN tag to use, so we attach a 905 * packet tag that holds it. 906 */ 907 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 908 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 909 m->m_flags |= M_VLANTAG; 910 } else { 911 m = ether_vlanencap(m, ifv->ifv_tag); 912 if (m == NULL) { 913 if_printf(ifp, 914 "unable to prepend VLAN header\n"); 915 ifp->if_oerrors++; 916 continue; 917 } 918 } 919 920 /* 921 * Send it, precisely as ether_output() would have. 922 * We are already running at splimp. 923 */ 924 error = (p->if_transmit)(p, m); 925 if (!error) 926 ifp->if_opackets++; 927 else 928 ifp->if_oerrors++; 929 } 930} 931 932static void 933vlan_input(struct ifnet *ifp, struct mbuf *m) 934{ 935 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 936 struct ifvlan *ifv; 937 uint16_t tag; 938 939 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 940 941 if (m->m_flags & M_VLANTAG) { 942 /* 943 * Packet is tagged, but m contains a normal 944 * Ethernet frame; the tag is stored out-of-band. 945 */ 946 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 947 m->m_flags &= ~M_VLANTAG; 948 } else { 949 struct ether_vlan_header *evl; 950 951 /* 952 * Packet is tagged in-band as specified by 802.1q. 953 */ 954 switch (ifp->if_type) { 955 case IFT_ETHER: 956 if (m->m_len < sizeof(*evl) && 957 (m = m_pullup(m, sizeof(*evl))) == NULL) { 958 if_printf(ifp, "cannot pullup VLAN header\n"); 959 return; 960 } 961 evl = mtod(m, struct ether_vlan_header *); 962 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 963 964 /* 965 * Remove the 802.1q header by copying the Ethernet 966 * addresses over it and adjusting the beginning of 967 * the data in the mbuf. The encapsulated Ethernet 968 * type field is already in place. 969 */ 970 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 971 ETHER_HDR_LEN - ETHER_TYPE_LEN); 972 m_adj(m, ETHER_VLAN_ENCAP_LEN); 973 break; 974 975 default: 976#ifdef INVARIANTS 977 panic("%s: %s has unsupported if_type %u", 978 __func__, ifp->if_xname, ifp->if_type); 979#endif 980 m_freem(m); 981 ifp->if_noproto++; 982 return; 983 } 984 } 985 986 TRUNK_RLOCK(trunk); 987#ifdef VLAN_ARRAY 988 ifv = trunk->vlans[tag]; 989#else 990 ifv = vlan_gethash(trunk, tag); 991#endif 992 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 993 TRUNK_RUNLOCK(trunk); 994 m_freem(m); 995 ifp->if_noproto++; 996 return; 997 } 998 TRUNK_RUNLOCK(trunk); 999 1000 m->m_pkthdr.rcvif = ifv->ifv_ifp; 1001 ifv->ifv_ifp->if_ipackets++; 1002 1003 /* Pass it back through the parent's input routine. */ 1004 (*ifp->if_input)(ifv->ifv_ifp, m); 1005} 1006 1007static int 1008vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 1009{ 1010 struct ifvlantrunk *trunk; 1011 struct ifnet *ifp; 1012 int error = 0; 1013 1014 /* VID numbers 0x0 and 0xFFF are reserved */ 1015 if (tag == 0 || tag == 0xFFF) 1016 return (EINVAL); 1017 if (p->if_type != IFT_ETHER) 1018 return (EPROTONOSUPPORT); 1019 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1020 return (EPROTONOSUPPORT); 1021 if (ifv->ifv_trunk) 1022 return (EBUSY); 1023 1024 if (p->if_vlantrunk == NULL) { 1025 trunk = malloc(sizeof(struct ifvlantrunk), 1026 M_VLAN, M_WAITOK | M_ZERO); 1027#ifndef VLAN_ARRAY 1028 vlan_inithash(trunk); 1029#endif 1030 VLAN_LOCK(); 1031 if (p->if_vlantrunk != NULL) { 1032 /* A race that that is very unlikely to be hit. */ 1033#ifndef VLAN_ARRAY 1034 vlan_freehash(trunk); 1035#endif 1036 free(trunk, M_VLAN); 1037 goto exists; 1038 } 1039 TRUNK_LOCK_INIT(trunk); 1040 TRUNK_LOCK(trunk); 1041 p->if_vlantrunk = trunk; 1042 trunk->parent = p; 1043 } else { 1044 VLAN_LOCK(); 1045exists: 1046 trunk = p->if_vlantrunk; 1047 TRUNK_LOCK(trunk); 1048 } 1049 1050 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1051#ifdef VLAN_ARRAY 1052 if (trunk->vlans[tag] != NULL) { 1053 error = EEXIST; 1054 goto done; 1055 } 1056 trunk->vlans[tag] = ifv; 1057 trunk->refcnt++; 1058#else 1059 error = vlan_inshash(trunk, ifv); 1060 if (error) 1061 goto done; 1062#endif 1063 ifv->ifv_proto = ETHERTYPE_VLAN; 1064 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1065 ifv->ifv_mintu = ETHERMIN; 1066 ifv->ifv_pflags = 0; 1067 1068 /* 1069 * If the parent supports the VLAN_MTU capability, 1070 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1071 * use it. 1072 */ 1073 if (p->if_capenable & IFCAP_VLAN_MTU) { 1074 /* 1075 * No need to fudge the MTU since the parent can 1076 * handle extended frames. 1077 */ 1078 ifv->ifv_mtufudge = 0; 1079 } else { 1080 /* 1081 * Fudge the MTU by the encapsulation size. This 1082 * makes us incompatible with strictly compliant 1083 * 802.1Q implementations, but allows us to use 1084 * the feature with other NetBSD implementations, 1085 * which might still be useful. 1086 */ 1087 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1088 } 1089 1090 ifv->ifv_trunk = trunk; 1091 ifp = ifv->ifv_ifp; 1092 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1093 ifp->if_baudrate = p->if_baudrate; 1094 /* 1095 * Copy only a selected subset of flags from the parent. 1096 * Other flags are none of our business. 1097 */ 1098#define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1099 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1100 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1101#undef VLAN_COPY_FLAGS 1102 1103 ifp->if_link_state = p->if_link_state; 1104 1105 vlan_capabilities(ifv); 1106 1107 /* 1108 * Set up our ``Ethernet address'' to reflect the underlying 1109 * physical interface's. 1110 */ 1111 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1112 1113 /* 1114 * Configure multicast addresses that may already be 1115 * joined on the vlan device. 1116 */ 1117 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1118 1119 /* We are ready for operation now. */ 1120 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1121done: 1122 TRUNK_UNLOCK(trunk); 1123 if (error == 0) 1124 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1125 VLAN_UNLOCK(); 1126 1127 return (error); 1128} 1129 1130static int 1131vlan_unconfig(struct ifnet *ifp) 1132{ 1133 int ret; 1134 1135 VLAN_LOCK(); 1136 ret = vlan_unconfig_locked(ifp); 1137 VLAN_UNLOCK(); 1138 return (ret); 1139} 1140 1141static int 1142vlan_unconfig_locked(struct ifnet *ifp) 1143{ 1144 struct ifvlantrunk *trunk; 1145 struct vlan_mc_entry *mc; 1146 struct ifvlan *ifv; 1147 struct ifnet *parent; 1148 int error; 1149 1150 VLAN_LOCK_ASSERT(); 1151 1152 ifv = ifp->if_softc; 1153 trunk = ifv->ifv_trunk; 1154 parent = NULL; 1155 1156 if (trunk != NULL) { 1157 struct sockaddr_dl sdl; 1158 1159 TRUNK_LOCK(trunk); 1160 parent = trunk->parent; 1161 1162 /* 1163 * Since the interface is being unconfigured, we need to 1164 * empty the list of multicast groups that we may have joined 1165 * while we were alive from the parent's list. 1166 */ 1167 bzero((char *)&sdl, sizeof(sdl)); 1168 sdl.sdl_len = sizeof(sdl); 1169 sdl.sdl_family = AF_LINK; 1170 sdl.sdl_index = parent->if_index; 1171 sdl.sdl_type = IFT_ETHER; 1172 sdl.sdl_alen = ETHER_ADDR_LEN; 1173 1174 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1175 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1176 ETHER_ADDR_LEN); 1177 error = if_delmulti(parent, (struct sockaddr *)&sdl); 1178 if (error) 1179 return (error); 1180 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1181 free(mc, M_VLAN); 1182 } 1183 1184 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1185#ifdef VLAN_ARRAY 1186 trunk->vlans[ifv->ifv_tag] = NULL; 1187 trunk->refcnt--; 1188#else 1189 vlan_remhash(trunk, ifv); 1190#endif 1191 ifv->ifv_trunk = NULL; 1192 1193 /* 1194 * Check if we were the last. 1195 */ 1196 if (trunk->refcnt == 0) { 1197 trunk->parent->if_vlantrunk = NULL; 1198 /* 1199 * XXXGL: If some ithread has already entered 1200 * vlan_input() and is now blocked on the trunk 1201 * lock, then it should preempt us right after 1202 * unlock and finish its work. Then we will acquire 1203 * lock again in trunk_destroy(). 1204 */ 1205 TRUNK_UNLOCK(trunk); 1206 trunk_destroy(trunk); 1207 } else 1208 TRUNK_UNLOCK(trunk); 1209 } 1210 1211 /* Disconnect from parent. */ 1212 if (ifv->ifv_pflags) 1213 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1214 ifp->if_mtu = ETHERMTU; 1215 ifp->if_link_state = LINK_STATE_UNKNOWN; 1216 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1217 1218 /* 1219 * Only dispatch an event if vlan was 1220 * attached, otherwise there is nothing 1221 * to cleanup anyway. 1222 */ 1223 if (parent != NULL) 1224 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1225 1226 return (0); 1227} 1228 1229/* Handle a reference counted flag that should be set on the parent as well */ 1230static int 1231vlan_setflag(struct ifnet *ifp, int flag, int status, 1232 int (*func)(struct ifnet *, int)) 1233{ 1234 struct ifvlan *ifv; 1235 int error; 1236 1237 /* XXX VLAN_LOCK_ASSERT(); */ 1238 1239 ifv = ifp->if_softc; 1240 status = status ? (ifp->if_flags & flag) : 0; 1241 /* Now "status" contains the flag value or 0 */ 1242 1243 /* 1244 * See if recorded parent's status is different from what 1245 * we want it to be. If it is, flip it. We record parent's 1246 * status in ifv_pflags so that we won't clear parent's flag 1247 * we haven't set. In fact, we don't clear or set parent's 1248 * flags directly, but get or release references to them. 1249 * That's why we can be sure that recorded flags still are 1250 * in accord with actual parent's flags. 1251 */ 1252 if (status != (ifv->ifv_pflags & flag)) { 1253 error = (*func)(PARENT(ifv), status); 1254 if (error) 1255 return (error); 1256 ifv->ifv_pflags &= ~flag; 1257 ifv->ifv_pflags |= status; 1258 } 1259 return (0); 1260} 1261 1262/* 1263 * Handle IFF_* flags that require certain changes on the parent: 1264 * if "status" is true, update parent's flags respective to our if_flags; 1265 * if "status" is false, forcedly clear the flags set on parent. 1266 */ 1267static int 1268vlan_setflags(struct ifnet *ifp, int status) 1269{ 1270 int error, i; 1271 1272 for (i = 0; vlan_pflags[i].flag; i++) { 1273 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1274 status, vlan_pflags[i].func); 1275 if (error) 1276 return (error); 1277 } 1278 return (0); 1279} 1280 1281/* Inform all vlans that their parent has changed link state */ 1282static void 1283vlan_link_state(struct ifnet *ifp) 1284{ 1285 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1286 struct ifvlan *ifv; 1287 int i; 1288 1289 TRUNK_LOCK(trunk); 1290#ifdef VLAN_ARRAY 1291 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1292 if (trunk->vlans[i] != NULL) { 1293 ifv = trunk->vlans[i]; 1294#else 1295 for (i = 0; i < (1 << trunk->hwidth); i++) 1296 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1297#endif 1298 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1299 if_link_state_change(ifv->ifv_ifp, 1300 trunk->parent->if_link_state); 1301 } 1302 TRUNK_UNLOCK(trunk); 1303} 1304 1305static void 1306vlan_capabilities(struct ifvlan *ifv) 1307{ 1308 struct ifnet *p = PARENT(ifv); 1309 struct ifnet *ifp = ifv->ifv_ifp; 1310 1311 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1312 1313 /* 1314 * If the parent interface can do checksum offloading 1315 * on VLANs, then propagate its hardware-assisted 1316 * checksumming flags. Also assert that checksum 1317 * offloading requires hardware VLAN tagging. 1318 */ 1319 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1320 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1321 1322 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1323 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1324 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1325 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1326 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1327 } else { 1328 ifp->if_capenable = 0; 1329 ifp->if_hwassist = 0; 1330 } 1331 /* 1332 * If the parent interface can do TSO on VLANs then 1333 * propagate the hardware-assisted flag. TSO on VLANs 1334 * does not necessarily require hardware VLAN tagging. 1335 */ 1336 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1337 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1338 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1339 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1340 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1341 } else { 1342 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1343 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1344 } 1345} 1346 1347static void 1348vlan_trunk_capabilities(struct ifnet *ifp) 1349{ 1350 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1351 struct ifvlan *ifv; 1352 int i; 1353 1354 TRUNK_LOCK(trunk); 1355#ifdef VLAN_ARRAY 1356 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1357 if (trunk->vlans[i] != NULL) { 1358 ifv = trunk->vlans[i]; 1359#else 1360 for (i = 0; i < (1 << trunk->hwidth); i++) { 1361 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1362#endif 1363 vlan_capabilities(ifv); 1364 } 1365 TRUNK_UNLOCK(trunk); 1366} 1367 1368static int 1369vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1370{ 1371 struct ifnet *p; 1372 struct ifreq *ifr; 1373 struct ifvlan *ifv; 1374 struct vlanreq vlr; 1375 int error = 0; 1376 1377 ifr = (struct ifreq *)data; 1378 ifv = ifp->if_softc; 1379 1380 switch (cmd) { 1381 case SIOCGIFMEDIA: 1382 VLAN_LOCK(); 1383 if (TRUNK(ifv) != NULL) { 1384 error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv), 1385 SIOCGIFMEDIA, data); 1386 VLAN_UNLOCK(); 1387 /* Limit the result to the parent's current config. */ 1388 if (error == 0) { 1389 struct ifmediareq *ifmr; 1390 1391 ifmr = (struct ifmediareq *)data; 1392 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1393 ifmr->ifm_count = 1; 1394 error = copyout(&ifmr->ifm_current, 1395 ifmr->ifm_ulist, 1396 sizeof(int)); 1397 } 1398 } 1399 } else { 1400 VLAN_UNLOCK(); 1401 error = EINVAL; 1402 } 1403 break; 1404 1405 case SIOCSIFMEDIA: 1406 error = EINVAL; 1407 break; 1408 1409 case SIOCSIFMTU: 1410 /* 1411 * Set the interface MTU. 1412 */ 1413 VLAN_LOCK(); 1414 if (TRUNK(ifv) != NULL) { 1415 if (ifr->ifr_mtu > 1416 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1417 ifr->ifr_mtu < 1418 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1419 error = EINVAL; 1420 else 1421 ifp->if_mtu = ifr->ifr_mtu; 1422 } else 1423 error = EINVAL; 1424 VLAN_UNLOCK(); 1425 break; 1426 1427 case SIOCSETVLAN: 1428 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1429 if (error) 1430 break; 1431 if (vlr.vlr_parent[0] == '\0') { 1432 vlan_unconfig(ifp); 1433 break; 1434 } 1435 p = ifunit(vlr.vlr_parent); 1436 if (p == NULL) { 1437 error = ENOENT; 1438 break; 1439 } 1440 /* 1441 * Don't let the caller set up a VLAN tag with 1442 * anything except VLID bits. 1443 */ 1444 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1445 error = EINVAL; 1446 break; 1447 } 1448 error = vlan_config(ifv, p, vlr.vlr_tag); 1449 if (error) 1450 break; 1451 1452 /* Update flags on the parent, if necessary. */ 1453 vlan_setflags(ifp, 1); 1454 break; 1455 1456 case SIOCGETVLAN: 1457 bzero(&vlr, sizeof(vlr)); 1458 VLAN_LOCK(); 1459 if (TRUNK(ifv) != NULL) { 1460 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1461 sizeof(vlr.vlr_parent)); 1462 vlr.vlr_tag = ifv->ifv_tag; 1463 } 1464 VLAN_UNLOCK(); 1465 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1466 break; 1467 1468 case SIOCSIFFLAGS: 1469 /* 1470 * We should propagate selected flags to the parent, 1471 * e.g., promiscuous mode. 1472 */ 1473 if (TRUNK(ifv) != NULL) 1474 error = vlan_setflags(ifp, 1); 1475 break; 1476 1477 case SIOCADDMULTI: 1478 case SIOCDELMULTI: 1479 /* 1480 * If we don't have a parent, just remember the membership for 1481 * when we do. 1482 */ 1483 if (TRUNK(ifv) != NULL) 1484 error = vlan_setmulti(ifp); 1485 break; 1486 1487 default: 1488 error = ether_ioctl(ifp, cmd, data); 1489 } 1490 1491 return (error); 1492} 1493