if_vlan.c revision 204156
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 30/* 31 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. 32 * Might be extended some day to also handle IEEE 802.1p priority 33 * tagging. This is sort of sneaky in the implementation, since 34 * we need to pretend to be enough of an Ethernet implementation 35 * to make arp work. The way we do this is by telling everyone 36 * that we are an Ethernet, and then catch the packets that 37 * ether_output() left on our output queue when it calls 38 * if_start(), rewrite them for use by the real outgoing interface, 39 * and ask it to send them. 40 */ 41 42#include <sys/cdefs.h> 43__FBSDID("$FreeBSD: head/sys/net/if_vlan.c 204156 2010-02-21 00:07:45Z yongari $"); 44 45#include "opt_vlan.h" 46 47#include <sys/param.h> 48#include <sys/kernel.h> 49#include <sys/lock.h> 50#include <sys/malloc.h> 51#include <sys/mbuf.h> 52#include <sys/module.h> 53#include <sys/rwlock.h> 54#include <sys/queue.h> 55#include <sys/socket.h> 56#include <sys/sockio.h> 57#include <sys/sysctl.h> 58#include <sys/systm.h> 59 60#include <net/bpf.h> 61#include <net/ethernet.h> 62#include <net/if.h> 63#include <net/if_clone.h> 64#include <net/if_dl.h> 65#include <net/if_types.h> 66#include <net/if_vlan_var.h> 67#include <net/vnet.h> 68 69#define VLANNAME "vlan" 70#define VLAN_DEF_HWIDTH 4 71#define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 72 73#define UP_AND_RUNNING(ifp) \ 74 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 75 76LIST_HEAD(ifvlanhead, ifvlan); 77 78struct ifvlantrunk { 79 struct ifnet *parent; /* parent interface of this trunk */ 80 struct rwlock rw; 81#ifdef VLAN_ARRAY 82#define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 83 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 84#else 85 struct ifvlanhead *hash; /* dynamic hash-list table */ 86 uint16_t hmask; 87 uint16_t hwidth; 88#endif 89 int refcnt; 90}; 91 92struct vlan_mc_entry { 93 struct ether_addr mc_addr; 94 SLIST_ENTRY(vlan_mc_entry) mc_entries; 95}; 96 97struct ifvlan { 98 struct ifvlantrunk *ifv_trunk; 99 struct ifnet *ifv_ifp; 100#define TRUNK(ifv) ((ifv)->ifv_trunk) 101#define PARENT(ifv) ((ifv)->ifv_trunk->parent) 102 int ifv_pflags; /* special flags we have set on parent */ 103 struct ifv_linkmib { 104 int ifvm_encaplen; /* encapsulation length */ 105 int ifvm_mtufudge; /* MTU fudged by this much */ 106 int ifvm_mintu; /* min transmission unit */ 107 uint16_t ifvm_proto; /* encapsulation ethertype */ 108 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 109 } ifv_mib; 110 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 111#ifndef VLAN_ARRAY 112 LIST_ENTRY(ifvlan) ifv_list; 113#endif 114}; 115#define ifv_proto ifv_mib.ifvm_proto 116#define ifv_tag ifv_mib.ifvm_tag 117#define ifv_encaplen ifv_mib.ifvm_encaplen 118#define ifv_mtufudge ifv_mib.ifvm_mtufudge 119#define ifv_mintu ifv_mib.ifvm_mintu 120 121/* Special flags we should propagate to parent. */ 122static struct { 123 int flag; 124 int (*func)(struct ifnet *, int); 125} vlan_pflags[] = { 126 {IFF_PROMISC, ifpromisc}, 127 {IFF_ALLMULTI, if_allmulti}, 128 {0, NULL} 129}; 130 131SYSCTL_DECL(_net_link); 132SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 133SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 134 135static int soft_pad = 0; 136SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 137 "pad short frames before tagging"); 138 139static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 140 141static eventhandler_tag ifdetach_tag; 142static eventhandler_tag iflladdr_tag; 143 144/* 145 * We have a global mutex, that is used to serialize configuration 146 * changes and isn't used in normal packet delivery. 147 * 148 * We also have a per-trunk rwlock, that is locked shared on packet 149 * processing and exclusive when configuration is changed. 150 * 151 * The VLAN_ARRAY substitutes the dynamic hash with a static array 152 * with 4096 entries. In theory this can give a boost in processing, 153 * however on practice it does not. Probably this is because array 154 * is too big to fit into CPU cache. 155 */ 156static struct mtx ifv_mtx; 157#define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 158#define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 159#define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 160#define VLAN_LOCK() mtx_lock(&ifv_mtx) 161#define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 162#define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 163#define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 164#define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 165#define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 166#define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 167#define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 168#define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 169#define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 170 171#ifndef VLAN_ARRAY 172static void vlan_inithash(struct ifvlantrunk *trunk); 173static void vlan_freehash(struct ifvlantrunk *trunk); 174static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 175static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 176static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 177static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 178 uint16_t tag); 179#endif 180static void trunk_destroy(struct ifvlantrunk *trunk); 181 182static void vlan_start(struct ifnet *ifp); 183static void vlan_init(void *foo); 184static void vlan_input(struct ifnet *ifp, struct mbuf *m); 185static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 186static int vlan_setflag(struct ifnet *ifp, int flag, int status, 187 int (*func)(struct ifnet *, int)); 188static int vlan_setflags(struct ifnet *ifp, int status); 189static int vlan_setmulti(struct ifnet *ifp); 190static int vlan_unconfig(struct ifnet *ifp); 191static int vlan_unconfig_locked(struct ifnet *ifp); 192static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 193static void vlan_link_state(struct ifnet *ifp); 194static void vlan_capabilities(struct ifvlan *ifv); 195static void vlan_trunk_capabilities(struct ifnet *ifp); 196 197static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 198 const char *, int *); 199static int vlan_clone_match(struct if_clone *, const char *); 200static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 201static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 202 203static void vlan_ifdetach(void *arg, struct ifnet *ifp); 204static void vlan_iflladdr(void *arg, struct ifnet *ifp); 205 206static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 207 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 208 209#ifndef VLAN_ARRAY 210#define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 211 212static void 213vlan_inithash(struct ifvlantrunk *trunk) 214{ 215 int i, n; 216 217 /* 218 * The trunk must not be locked here since we call malloc(M_WAITOK). 219 * It is OK in case this function is called before the trunk struct 220 * gets hooked up and becomes visible from other threads. 221 */ 222 223 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 224 ("%s: hash already initialized", __func__)); 225 226 trunk->hwidth = VLAN_DEF_HWIDTH; 227 n = 1 << trunk->hwidth; 228 trunk->hmask = n - 1; 229 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 230 for (i = 0; i < n; i++) 231 LIST_INIT(&trunk->hash[i]); 232} 233 234static void 235vlan_freehash(struct ifvlantrunk *trunk) 236{ 237#ifdef INVARIANTS 238 int i; 239 240 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 241 for (i = 0; i < (1 << trunk->hwidth); i++) 242 KASSERT(LIST_EMPTY(&trunk->hash[i]), 243 ("%s: hash table not empty", __func__)); 244#endif 245 free(trunk->hash, M_VLAN); 246 trunk->hash = NULL; 247 trunk->hwidth = trunk->hmask = 0; 248} 249 250static int 251vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 252{ 253 int i, b; 254 struct ifvlan *ifv2; 255 256 TRUNK_LOCK_ASSERT(trunk); 257 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 258 259 b = 1 << trunk->hwidth; 260 i = HASH(ifv->ifv_tag, trunk->hmask); 261 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 262 if (ifv->ifv_tag == ifv2->ifv_tag) 263 return (EEXIST); 264 265 /* 266 * Grow the hash when the number of vlans exceeds half of the number of 267 * hash buckets squared. This will make the average linked-list length 268 * buckets/2. 269 */ 270 if (trunk->refcnt > (b * b) / 2) { 271 vlan_growhash(trunk, 1); 272 i = HASH(ifv->ifv_tag, trunk->hmask); 273 } 274 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 275 trunk->refcnt++; 276 277 return (0); 278} 279 280static int 281vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 282{ 283 int i, b; 284 struct ifvlan *ifv2; 285 286 TRUNK_LOCK_ASSERT(trunk); 287 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 288 289 b = 1 << trunk->hwidth; 290 i = HASH(ifv->ifv_tag, trunk->hmask); 291 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 292 if (ifv2 == ifv) { 293 trunk->refcnt--; 294 LIST_REMOVE(ifv2, ifv_list); 295 if (trunk->refcnt < (b * b) / 2) 296 vlan_growhash(trunk, -1); 297 return (0); 298 } 299 300 panic("%s: vlan not found\n", __func__); 301 return (ENOENT); /*NOTREACHED*/ 302} 303 304/* 305 * Grow the hash larger or smaller if memory permits. 306 */ 307static void 308vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 309{ 310 struct ifvlan *ifv; 311 struct ifvlanhead *hash2; 312 int hwidth2, i, j, n, n2; 313 314 TRUNK_LOCK_ASSERT(trunk); 315 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 316 317 if (howmuch == 0) { 318 /* Harmless yet obvious coding error */ 319 printf("%s: howmuch is 0\n", __func__); 320 return; 321 } 322 323 hwidth2 = trunk->hwidth + howmuch; 324 n = 1 << trunk->hwidth; 325 n2 = 1 << hwidth2; 326 /* Do not shrink the table below the default */ 327 if (hwidth2 < VLAN_DEF_HWIDTH) 328 return; 329 330 /* M_NOWAIT because we're called with trunk mutex held */ 331 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 332 if (hash2 == NULL) { 333 printf("%s: out of memory -- hash size not changed\n", 334 __func__); 335 return; /* We can live with the old hash table */ 336 } 337 for (j = 0; j < n2; j++) 338 LIST_INIT(&hash2[j]); 339 for (i = 0; i < n; i++) 340 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 341 LIST_REMOVE(ifv, ifv_list); 342 j = HASH(ifv->ifv_tag, n2 - 1); 343 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 344 } 345 free(trunk->hash, M_VLAN); 346 trunk->hash = hash2; 347 trunk->hwidth = hwidth2; 348 trunk->hmask = n2 - 1; 349 350 if (bootverbose) 351 if_printf(trunk->parent, 352 "VLAN hash table resized from %d to %d buckets\n", n, n2); 353} 354 355static __inline struct ifvlan * 356vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 357{ 358 struct ifvlan *ifv; 359 360 TRUNK_LOCK_RASSERT(trunk); 361 362 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 363 if (ifv->ifv_tag == tag) 364 return (ifv); 365 return (NULL); 366} 367 368#if 0 369/* Debugging code to view the hashtables. */ 370static void 371vlan_dumphash(struct ifvlantrunk *trunk) 372{ 373 int i; 374 struct ifvlan *ifv; 375 376 for (i = 0; i < (1 << trunk->hwidth); i++) { 377 printf("%d: ", i); 378 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 379 printf("%s ", ifv->ifv_ifp->if_xname); 380 printf("\n"); 381 } 382} 383#endif /* 0 */ 384#endif /* !VLAN_ARRAY */ 385 386static void 387trunk_destroy(struct ifvlantrunk *trunk) 388{ 389 VLAN_LOCK_ASSERT(); 390 391 TRUNK_LOCK(trunk); 392#ifndef VLAN_ARRAY 393 vlan_freehash(trunk); 394#endif 395 trunk->parent->if_vlantrunk = NULL; 396 TRUNK_UNLOCK(trunk); 397 TRUNK_LOCK_DESTROY(trunk); 398 free(trunk, M_VLAN); 399} 400 401/* 402 * Program our multicast filter. What we're actually doing is 403 * programming the multicast filter of the parent. This has the 404 * side effect of causing the parent interface to receive multicast 405 * traffic that it doesn't really want, which ends up being discarded 406 * later by the upper protocol layers. Unfortunately, there's no way 407 * to avoid this: there really is only one physical interface. 408 * 409 * XXX: There is a possible race here if more than one thread is 410 * modifying the multicast state of the vlan interface at the same time. 411 */ 412static int 413vlan_setmulti(struct ifnet *ifp) 414{ 415 struct ifnet *ifp_p; 416 struct ifmultiaddr *ifma, *rifma = NULL; 417 struct ifvlan *sc; 418 struct vlan_mc_entry *mc; 419 struct sockaddr_dl sdl; 420 int error; 421 422 /*VLAN_LOCK_ASSERT();*/ 423 424 /* Find the parent. */ 425 sc = ifp->if_softc; 426 ifp_p = PARENT(sc); 427 428 CURVNET_SET_QUIET(ifp_p->if_vnet); 429 430 bzero((char *)&sdl, sizeof(sdl)); 431 sdl.sdl_len = sizeof(sdl); 432 sdl.sdl_family = AF_LINK; 433 sdl.sdl_index = ifp_p->if_index; 434 sdl.sdl_type = IFT_ETHER; 435 sdl.sdl_alen = ETHER_ADDR_LEN; 436 437 /* First, remove any existing filter entries. */ 438 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 439 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 440 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 441 if (error) 442 return (error); 443 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 444 free(mc, M_VLAN); 445 } 446 447 /* Now program new ones. */ 448 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 449 if (ifma->ifma_addr->sa_family != AF_LINK) 450 continue; 451 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 452 if (mc == NULL) 453 return (ENOMEM); 454 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 455 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 456 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 457 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 458 LLADDR(&sdl), ETHER_ADDR_LEN); 459 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 460 if (error) 461 return (error); 462 } 463 464 CURVNET_RESTORE(); 465 return (0); 466} 467 468/* 469 * A handler for parent interface link layer address changes. 470 * If the parent interface link layer address is changed we 471 * should also change it on all children vlans. 472 */ 473static void 474vlan_iflladdr(void *arg __unused, struct ifnet *ifp) 475{ 476 struct ifvlan *ifv; 477#ifndef VLAN_ARRAY 478 struct ifvlan *next; 479#endif 480 int i; 481 482 /* 483 * Check if it's a trunk interface first of all 484 * to avoid needless locking. 485 */ 486 if (ifp->if_vlantrunk == NULL) 487 return; 488 489 VLAN_LOCK(); 490 /* 491 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it. 492 */ 493#ifdef VLAN_ARRAY 494 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 495 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 496#else /* VLAN_ARRAY */ 497 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 498 LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) { 499#endif /* VLAN_ARRAY */ 500 VLAN_UNLOCK(); 501 if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), ETHER_ADDR_LEN); 502 VLAN_LOCK(); 503 } 504 VLAN_UNLOCK(); 505 506} 507 508/* 509 * A handler for network interface departure events. 510 * Track departure of trunks here so that we don't access invalid 511 * pointers or whatever if a trunk is ripped from under us, e.g., 512 * by ejecting its hot-plug card. However, if an ifnet is simply 513 * being renamed, then there's no need to tear down the state. 514 */ 515static void 516vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 517{ 518 struct ifvlan *ifv; 519 int i; 520 521 /* 522 * Check if it's a trunk interface first of all 523 * to avoid needless locking. 524 */ 525 if (ifp->if_vlantrunk == NULL) 526 return; 527 528 /* If the ifnet is just being renamed, don't do anything. */ 529 if (ifp->if_flags & IFF_RENAMING) 530 return; 531 532 VLAN_LOCK(); 533 /* 534 * OK, it's a trunk. Loop over and detach all vlan's on it. 535 * Check trunk pointer after each vlan_unconfig() as it will 536 * free it and set to NULL after the last vlan was detached. 537 */ 538#ifdef VLAN_ARRAY 539 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 540 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 541 vlan_unconfig_locked(ifv->ifv_ifp); 542 if (ifp->if_vlantrunk == NULL) 543 break; 544 } 545#else /* VLAN_ARRAY */ 546restart: 547 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 548 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 549 vlan_unconfig_locked(ifv->ifv_ifp); 550 if (ifp->if_vlantrunk) 551 goto restart; /* trunk->hwidth can change */ 552 else 553 break; 554 } 555#endif /* VLAN_ARRAY */ 556 /* Trunk should have been destroyed in vlan_unconfig(). */ 557 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 558 VLAN_UNLOCK(); 559} 560 561/* 562 * VLAN support can be loaded as a module. The only place in the 563 * system that's intimately aware of this is ether_input. We hook 564 * into this code through vlan_input_p which is defined there and 565 * set here. Noone else in the system should be aware of this so 566 * we use an explicit reference here. 567 */ 568extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 569 570/* For if_link_state_change() eyes only... */ 571extern void (*vlan_link_state_p)(struct ifnet *); 572 573static int 574vlan_modevent(module_t mod, int type, void *data) 575{ 576 577 switch (type) { 578 case MOD_LOAD: 579 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 580 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 581 if (ifdetach_tag == NULL) 582 return (ENOMEM); 583 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 584 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 585 if (iflladdr_tag == NULL) 586 return (ENOMEM); 587 VLAN_LOCK_INIT(); 588 vlan_input_p = vlan_input; 589 vlan_link_state_p = vlan_link_state; 590 vlan_trunk_cap_p = vlan_trunk_capabilities; 591 if_clone_attach(&vlan_cloner); 592 if (bootverbose) 593 printf("vlan: initialized, using " 594#ifdef VLAN_ARRAY 595 "full-size arrays" 596#else 597 "hash tables with chaining" 598#endif 599 600 "\n"); 601 break; 602 case MOD_UNLOAD: 603 if_clone_detach(&vlan_cloner); 604 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 605 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag); 606 vlan_input_p = NULL; 607 vlan_link_state_p = NULL; 608 vlan_trunk_cap_p = NULL; 609 VLAN_LOCK_DESTROY(); 610 if (bootverbose) 611 printf("vlan: unloaded\n"); 612 break; 613 default: 614 return (EOPNOTSUPP); 615 } 616 return (0); 617} 618 619static moduledata_t vlan_mod = { 620 "if_vlan", 621 vlan_modevent, 622 0 623}; 624 625DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 626MODULE_VERSION(if_vlan, 3); 627 628static struct ifnet * 629vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 630{ 631 const char *cp; 632 struct ifnet *ifp; 633 int t; 634 635 /* Check for <etherif>.<vlan> style interface names. */ 636 IFNET_RLOCK_NOSLEEP(); 637 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 638 if (ifp->if_type != IFT_ETHER) 639 continue; 640 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 641 continue; 642 cp = name + strlen(ifp->if_xname); 643 if (*cp++ != '.') 644 continue; 645 if (*cp == '\0') 646 continue; 647 t = 0; 648 for(; *cp >= '0' && *cp <= '9'; cp++) 649 t = (t * 10) + (*cp - '0'); 650 if (*cp != '\0') 651 continue; 652 if (tag != NULL) 653 *tag = t; 654 break; 655 } 656 IFNET_RUNLOCK_NOSLEEP(); 657 658 return (ifp); 659} 660 661static int 662vlan_clone_match(struct if_clone *ifc, const char *name) 663{ 664 const char *cp; 665 666 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 667 return (1); 668 669 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 670 return (0); 671 for (cp = name + 4; *cp != '\0'; cp++) { 672 if (*cp < '0' || *cp > '9') 673 return (0); 674 } 675 676 return (1); 677} 678 679static int 680vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 681{ 682 char *dp; 683 int wildcard; 684 int unit; 685 int error; 686 int tag; 687 int ethertag; 688 struct ifvlan *ifv; 689 struct ifnet *ifp; 690 struct ifnet *p; 691 struct vlanreq vlr; 692 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 693 694 /* 695 * There are 3 (ugh) ways to specify the cloned device: 696 * o pass a parameter block with the clone request. 697 * o specify parameters in the text of the clone device name 698 * o specify no parameters and get an unattached device that 699 * must be configured separately. 700 * The first technique is preferred; the latter two are 701 * supported for backwards compatibilty. 702 */ 703 if (params) { 704 error = copyin(params, &vlr, sizeof(vlr)); 705 if (error) 706 return error; 707 p = ifunit(vlr.vlr_parent); 708 if (p == NULL) 709 return ENXIO; 710 /* 711 * Don't let the caller set up a VLAN tag with 712 * anything except VLID bits. 713 */ 714 if (vlr.vlr_tag & ~EVL_VLID_MASK) 715 return (EINVAL); 716 error = ifc_name2unit(name, &unit); 717 if (error != 0) 718 return (error); 719 720 ethertag = 1; 721 tag = vlr.vlr_tag; 722 wildcard = (unit < 0); 723 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 724 ethertag = 1; 725 unit = -1; 726 wildcard = 0; 727 728 /* 729 * Don't let the caller set up a VLAN tag with 730 * anything except VLID bits. 731 */ 732 if (tag & ~EVL_VLID_MASK) 733 return (EINVAL); 734 } else { 735 ethertag = 0; 736 737 error = ifc_name2unit(name, &unit); 738 if (error != 0) 739 return (error); 740 741 wildcard = (unit < 0); 742 } 743 744 error = ifc_alloc_unit(ifc, &unit); 745 if (error != 0) 746 return (error); 747 748 /* In the wildcard case, we need to update the name. */ 749 if (wildcard) { 750 for (dp = name; *dp != '\0'; dp++); 751 if (snprintf(dp, len - (dp-name), "%d", unit) > 752 len - (dp-name) - 1) { 753 panic("%s: interface name too long", __func__); 754 } 755 } 756 757 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 758 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 759 if (ifp == NULL) { 760 ifc_free_unit(ifc, unit); 761 free(ifv, M_VLAN); 762 return (ENOSPC); 763 } 764 SLIST_INIT(&ifv->vlan_mc_listhead); 765 766 ifp->if_softc = ifv; 767 /* 768 * Set the name manually rather than using if_initname because 769 * we don't conform to the default naming convention for interfaces. 770 */ 771 strlcpy(ifp->if_xname, name, IFNAMSIZ); 772 ifp->if_dname = ifc->ifc_name; 773 ifp->if_dunit = unit; 774 /* NB: flags are not set here */ 775 ifp->if_linkmib = &ifv->ifv_mib; 776 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 777 /* NB: mtu is not set here */ 778 779 ifp->if_init = vlan_init; 780 ifp->if_start = vlan_start; 781 ifp->if_ioctl = vlan_ioctl; 782 ifp->if_snd.ifq_maxlen = ifqmaxlen; 783 ifp->if_flags = VLAN_IFFLAGS; 784 ether_ifattach(ifp, eaddr); 785 /* Now undo some of the damage... */ 786 ifp->if_baudrate = 0; 787 ifp->if_type = IFT_L2VLAN; 788 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 789 790 if (ethertag) { 791 error = vlan_config(ifv, p, tag); 792 if (error != 0) { 793 /* 794 * Since we've partialy failed, we need to back 795 * out all the way, otherwise userland could get 796 * confused. Thus, we destroy the interface. 797 */ 798 ether_ifdetach(ifp); 799 vlan_unconfig(ifp); 800 if_free_type(ifp, IFT_ETHER); 801 ifc_free_unit(ifc, unit); 802 free(ifv, M_VLAN); 803 804 return (error); 805 } 806 807 /* Update flags on the parent, if necessary. */ 808 vlan_setflags(ifp, 1); 809 } 810 811 return (0); 812} 813 814static int 815vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 816{ 817 struct ifvlan *ifv = ifp->if_softc; 818 int unit = ifp->if_dunit; 819 820 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 821 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 822 if_free_type(ifp, IFT_ETHER); 823 free(ifv, M_VLAN); 824 ifc_free_unit(ifc, unit); 825 826 return (0); 827} 828 829/* 830 * The ifp->if_init entry point for vlan(4) is a no-op. 831 */ 832static void 833vlan_init(void *foo __unused) 834{ 835} 836 837/* 838 * The if_start method for vlan(4) interface. It doesn't 839 * raises the IFF_DRV_OACTIVE flag, since it is called 840 * only from IFQ_HANDOFF() macro in ether_output_frame(). 841 * If the interface queue is full, and vlan_start() is 842 * not called, the queue would never get emptied and 843 * interface would stall forever. 844 */ 845static void 846vlan_start(struct ifnet *ifp) 847{ 848 struct ifvlan *ifv; 849 struct ifnet *p; 850 struct mbuf *m; 851 int error; 852 853 ifv = ifp->if_softc; 854 p = PARENT(ifv); 855 856 for (;;) { 857 IF_DEQUEUE(&ifp->if_snd, m); 858 if (m == NULL) 859 break; 860 BPF_MTAP(ifp, m); 861 862 /* 863 * Do not run parent's if_start() if the parent is not up, 864 * or parent's driver will cause a system crash. 865 */ 866 if (!UP_AND_RUNNING(p)) { 867 m_freem(m); 868 ifp->if_collisions++; 869 continue; 870 } 871 872 /* 873 * Pad the frame to the minimum size allowed if told to. 874 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 875 * paragraph C.4.4.3.b. It can help to work around buggy 876 * bridges that violate paragraph C.4.4.3.a from the same 877 * document, i.e., fail to pad short frames after untagging. 878 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 879 * untagging it will produce a 62-byte frame, which is a runt 880 * and requires padding. There are VLAN-enabled network 881 * devices that just discard such runts instead or mishandle 882 * them somehow. 883 */ 884 if (soft_pad) { 885 static char pad[8]; /* just zeros */ 886 int n; 887 888 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 889 n > 0; n -= sizeof(pad)) 890 if (!m_append(m, min(n, sizeof(pad)), pad)) 891 break; 892 893 if (n > 0) { 894 if_printf(ifp, "cannot pad short frame\n"); 895 ifp->if_oerrors++; 896 m_freem(m); 897 continue; 898 } 899 } 900 901 /* 902 * If underlying interface can do VLAN tag insertion itself, 903 * just pass the packet along. However, we need some way to 904 * tell the interface where the packet came from so that it 905 * knows how to find the VLAN tag to use, so we attach a 906 * packet tag that holds it. 907 */ 908 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 909 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 910 m->m_flags |= M_VLANTAG; 911 } else { 912 m = ether_vlanencap(m, ifv->ifv_tag); 913 if (m == NULL) { 914 if_printf(ifp, 915 "unable to prepend VLAN header\n"); 916 ifp->if_oerrors++; 917 continue; 918 } 919 } 920 921 /* 922 * Send it, precisely as ether_output() would have. 923 * We are already running at splimp. 924 */ 925 error = (p->if_transmit)(p, m); 926 if (!error) 927 ifp->if_opackets++; 928 else 929 ifp->if_oerrors++; 930 } 931} 932 933static void 934vlan_input(struct ifnet *ifp, struct mbuf *m) 935{ 936 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 937 struct ifvlan *ifv; 938 uint16_t tag; 939 940 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 941 942 if (m->m_flags & M_VLANTAG) { 943 /* 944 * Packet is tagged, but m contains a normal 945 * Ethernet frame; the tag is stored out-of-band. 946 */ 947 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 948 m->m_flags &= ~M_VLANTAG; 949 } else { 950 struct ether_vlan_header *evl; 951 952 /* 953 * Packet is tagged in-band as specified by 802.1q. 954 */ 955 switch (ifp->if_type) { 956 case IFT_ETHER: 957 if (m->m_len < sizeof(*evl) && 958 (m = m_pullup(m, sizeof(*evl))) == NULL) { 959 if_printf(ifp, "cannot pullup VLAN header\n"); 960 return; 961 } 962 evl = mtod(m, struct ether_vlan_header *); 963 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 964 965 /* 966 * Remove the 802.1q header by copying the Ethernet 967 * addresses over it and adjusting the beginning of 968 * the data in the mbuf. The encapsulated Ethernet 969 * type field is already in place. 970 */ 971 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 972 ETHER_HDR_LEN - ETHER_TYPE_LEN); 973 m_adj(m, ETHER_VLAN_ENCAP_LEN); 974 break; 975 976 default: 977#ifdef INVARIANTS 978 panic("%s: %s has unsupported if_type %u", 979 __func__, ifp->if_xname, ifp->if_type); 980#endif 981 m_freem(m); 982 ifp->if_noproto++; 983 return; 984 } 985 } 986 987 TRUNK_RLOCK(trunk); 988#ifdef VLAN_ARRAY 989 ifv = trunk->vlans[tag]; 990#else 991 ifv = vlan_gethash(trunk, tag); 992#endif 993 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 994 TRUNK_RUNLOCK(trunk); 995 m_freem(m); 996 ifp->if_noproto++; 997 return; 998 } 999 TRUNK_RUNLOCK(trunk); 1000 1001 m->m_pkthdr.rcvif = ifv->ifv_ifp; 1002 ifv->ifv_ifp->if_ipackets++; 1003 1004 /* Pass it back through the parent's input routine. */ 1005 (*ifp->if_input)(ifv->ifv_ifp, m); 1006} 1007 1008static int 1009vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 1010{ 1011 struct ifvlantrunk *trunk; 1012 struct ifnet *ifp; 1013 int error = 0; 1014 1015 /* VID numbers 0x0 and 0xFFF are reserved */ 1016 if (tag == 0 || tag == 0xFFF) 1017 return (EINVAL); 1018 if (p->if_type != IFT_ETHER) 1019 return (EPROTONOSUPPORT); 1020 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1021 return (EPROTONOSUPPORT); 1022 if (ifv->ifv_trunk) 1023 return (EBUSY); 1024 1025 if (p->if_vlantrunk == NULL) { 1026 trunk = malloc(sizeof(struct ifvlantrunk), 1027 M_VLAN, M_WAITOK | M_ZERO); 1028#ifndef VLAN_ARRAY 1029 vlan_inithash(trunk); 1030#endif 1031 VLAN_LOCK(); 1032 if (p->if_vlantrunk != NULL) { 1033 /* A race that that is very unlikely to be hit. */ 1034#ifndef VLAN_ARRAY 1035 vlan_freehash(trunk); 1036#endif 1037 free(trunk, M_VLAN); 1038 goto exists; 1039 } 1040 TRUNK_LOCK_INIT(trunk); 1041 TRUNK_LOCK(trunk); 1042 p->if_vlantrunk = trunk; 1043 trunk->parent = p; 1044 } else { 1045 VLAN_LOCK(); 1046exists: 1047 trunk = p->if_vlantrunk; 1048 TRUNK_LOCK(trunk); 1049 } 1050 1051 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1052#ifdef VLAN_ARRAY 1053 if (trunk->vlans[tag] != NULL) { 1054 error = EEXIST; 1055 goto done; 1056 } 1057 trunk->vlans[tag] = ifv; 1058 trunk->refcnt++; 1059#else 1060 error = vlan_inshash(trunk, ifv); 1061 if (error) 1062 goto done; 1063#endif 1064 ifv->ifv_proto = ETHERTYPE_VLAN; 1065 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1066 ifv->ifv_mintu = ETHERMIN; 1067 ifv->ifv_pflags = 0; 1068 1069 /* 1070 * If the parent supports the VLAN_MTU capability, 1071 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1072 * use it. 1073 */ 1074 if (p->if_capenable & IFCAP_VLAN_MTU) { 1075 /* 1076 * No need to fudge the MTU since the parent can 1077 * handle extended frames. 1078 */ 1079 ifv->ifv_mtufudge = 0; 1080 } else { 1081 /* 1082 * Fudge the MTU by the encapsulation size. This 1083 * makes us incompatible with strictly compliant 1084 * 802.1Q implementations, but allows us to use 1085 * the feature with other NetBSD implementations, 1086 * which might still be useful. 1087 */ 1088 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1089 } 1090 1091 ifv->ifv_trunk = trunk; 1092 ifp = ifv->ifv_ifp; 1093 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1094 ifp->if_baudrate = p->if_baudrate; 1095 /* 1096 * Copy only a selected subset of flags from the parent. 1097 * Other flags are none of our business. 1098 */ 1099#define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1100 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1101 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1102#undef VLAN_COPY_FLAGS 1103 1104 ifp->if_link_state = p->if_link_state; 1105 1106 vlan_capabilities(ifv); 1107 1108 /* 1109 * Set up our ``Ethernet address'' to reflect the underlying 1110 * physical interface's. 1111 */ 1112 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1113 1114 /* 1115 * Configure multicast addresses that may already be 1116 * joined on the vlan device. 1117 */ 1118 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1119 1120 /* We are ready for operation now. */ 1121 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1122done: 1123 TRUNK_UNLOCK(trunk); 1124 if (error == 0) 1125 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1126 VLAN_UNLOCK(); 1127 1128 return (error); 1129} 1130 1131static int 1132vlan_unconfig(struct ifnet *ifp) 1133{ 1134 int ret; 1135 1136 VLAN_LOCK(); 1137 ret = vlan_unconfig_locked(ifp); 1138 VLAN_UNLOCK(); 1139 return (ret); 1140} 1141 1142static int 1143vlan_unconfig_locked(struct ifnet *ifp) 1144{ 1145 struct ifvlantrunk *trunk; 1146 struct vlan_mc_entry *mc; 1147 struct ifvlan *ifv; 1148 struct ifnet *parent; 1149 int error; 1150 1151 VLAN_LOCK_ASSERT(); 1152 1153 ifv = ifp->if_softc; 1154 trunk = ifv->ifv_trunk; 1155 parent = NULL; 1156 1157 if (trunk != NULL) { 1158 struct sockaddr_dl sdl; 1159 1160 TRUNK_LOCK(trunk); 1161 parent = trunk->parent; 1162 1163 /* 1164 * Since the interface is being unconfigured, we need to 1165 * empty the list of multicast groups that we may have joined 1166 * while we were alive from the parent's list. 1167 */ 1168 bzero((char *)&sdl, sizeof(sdl)); 1169 sdl.sdl_len = sizeof(sdl); 1170 sdl.sdl_family = AF_LINK; 1171 sdl.sdl_index = parent->if_index; 1172 sdl.sdl_type = IFT_ETHER; 1173 sdl.sdl_alen = ETHER_ADDR_LEN; 1174 1175 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1176 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1177 ETHER_ADDR_LEN); 1178 error = if_delmulti(parent, (struct sockaddr *)&sdl); 1179 if (error) 1180 return (error); 1181 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1182 free(mc, M_VLAN); 1183 } 1184 1185 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1186#ifdef VLAN_ARRAY 1187 trunk->vlans[ifv->ifv_tag] = NULL; 1188 trunk->refcnt--; 1189#else 1190 vlan_remhash(trunk, ifv); 1191#endif 1192 ifv->ifv_trunk = NULL; 1193 1194 /* 1195 * Check if we were the last. 1196 */ 1197 if (trunk->refcnt == 0) { 1198 trunk->parent->if_vlantrunk = NULL; 1199 /* 1200 * XXXGL: If some ithread has already entered 1201 * vlan_input() and is now blocked on the trunk 1202 * lock, then it should preempt us right after 1203 * unlock and finish its work. Then we will acquire 1204 * lock again in trunk_destroy(). 1205 */ 1206 TRUNK_UNLOCK(trunk); 1207 trunk_destroy(trunk); 1208 } else 1209 TRUNK_UNLOCK(trunk); 1210 } 1211 1212 /* Disconnect from parent. */ 1213 if (ifv->ifv_pflags) 1214 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1215 ifp->if_mtu = ETHERMTU; 1216 ifp->if_link_state = LINK_STATE_UNKNOWN; 1217 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1218 1219 /* 1220 * Only dispatch an event if vlan was 1221 * attached, otherwise there is nothing 1222 * to cleanup anyway. 1223 */ 1224 if (parent != NULL) 1225 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1226 1227 return (0); 1228} 1229 1230/* Handle a reference counted flag that should be set on the parent as well */ 1231static int 1232vlan_setflag(struct ifnet *ifp, int flag, int status, 1233 int (*func)(struct ifnet *, int)) 1234{ 1235 struct ifvlan *ifv; 1236 int error; 1237 1238 /* XXX VLAN_LOCK_ASSERT(); */ 1239 1240 ifv = ifp->if_softc; 1241 status = status ? (ifp->if_flags & flag) : 0; 1242 /* Now "status" contains the flag value or 0 */ 1243 1244 /* 1245 * See if recorded parent's status is different from what 1246 * we want it to be. If it is, flip it. We record parent's 1247 * status in ifv_pflags so that we won't clear parent's flag 1248 * we haven't set. In fact, we don't clear or set parent's 1249 * flags directly, but get or release references to them. 1250 * That's why we can be sure that recorded flags still are 1251 * in accord with actual parent's flags. 1252 */ 1253 if (status != (ifv->ifv_pflags & flag)) { 1254 error = (*func)(PARENT(ifv), status); 1255 if (error) 1256 return (error); 1257 ifv->ifv_pflags &= ~flag; 1258 ifv->ifv_pflags |= status; 1259 } 1260 return (0); 1261} 1262 1263/* 1264 * Handle IFF_* flags that require certain changes on the parent: 1265 * if "status" is true, update parent's flags respective to our if_flags; 1266 * if "status" is false, forcedly clear the flags set on parent. 1267 */ 1268static int 1269vlan_setflags(struct ifnet *ifp, int status) 1270{ 1271 int error, i; 1272 1273 for (i = 0; vlan_pflags[i].flag; i++) { 1274 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1275 status, vlan_pflags[i].func); 1276 if (error) 1277 return (error); 1278 } 1279 return (0); 1280} 1281 1282/* Inform all vlans that their parent has changed link state */ 1283static void 1284vlan_link_state(struct ifnet *ifp) 1285{ 1286 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1287 struct ifvlan *ifv; 1288 int i; 1289 1290 TRUNK_LOCK(trunk); 1291#ifdef VLAN_ARRAY 1292 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1293 if (trunk->vlans[i] != NULL) { 1294 ifv = trunk->vlans[i]; 1295#else 1296 for (i = 0; i < (1 << trunk->hwidth); i++) 1297 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1298#endif 1299 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1300 if_link_state_change(ifv->ifv_ifp, 1301 trunk->parent->if_link_state); 1302 } 1303 TRUNK_UNLOCK(trunk); 1304} 1305 1306static void 1307vlan_capabilities(struct ifvlan *ifv) 1308{ 1309 struct ifnet *p = PARENT(ifv); 1310 struct ifnet *ifp = ifv->ifv_ifp; 1311 1312 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1313 1314 /* 1315 * If the parent interface can do checksum offloading 1316 * on VLANs, then propagate its hardware-assisted 1317 * checksumming flags. Also assert that checksum 1318 * offloading requires hardware VLAN tagging. 1319 */ 1320 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1321 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1322 1323 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1324 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1325 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1326 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1327 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1328 } else { 1329 ifp->if_capenable = 0; 1330 ifp->if_hwassist = 0; 1331 } 1332 /* 1333 * If the parent interface can do TSO on VLANs then 1334 * propagate the hardware-assisted flag. TSO on VLANs 1335 * does not necessarily require hardware VLAN tagging. 1336 */ 1337 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1338 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1339 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1340 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1341 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1342 } else { 1343 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1344 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1345 } 1346} 1347 1348static void 1349vlan_trunk_capabilities(struct ifnet *ifp) 1350{ 1351 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1352 struct ifvlan *ifv; 1353 int i; 1354 1355 TRUNK_LOCK(trunk); 1356#ifdef VLAN_ARRAY 1357 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1358 if (trunk->vlans[i] != NULL) { 1359 ifv = trunk->vlans[i]; 1360#else 1361 for (i = 0; i < (1 << trunk->hwidth); i++) { 1362 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1363#endif 1364 vlan_capabilities(ifv); 1365 } 1366 TRUNK_UNLOCK(trunk); 1367} 1368 1369static int 1370vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1371{ 1372 struct ifnet *p; 1373 struct ifreq *ifr; 1374 struct ifvlan *ifv; 1375 struct vlanreq vlr; 1376 int error = 0; 1377 1378 ifr = (struct ifreq *)data; 1379 ifv = ifp->if_softc; 1380 1381 switch (cmd) { 1382 case SIOCGIFMEDIA: 1383 VLAN_LOCK(); 1384 if (TRUNK(ifv) != NULL) { 1385 error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv), 1386 SIOCGIFMEDIA, data); 1387 VLAN_UNLOCK(); 1388 /* Limit the result to the parent's current config. */ 1389 if (error == 0) { 1390 struct ifmediareq *ifmr; 1391 1392 ifmr = (struct ifmediareq *)data; 1393 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1394 ifmr->ifm_count = 1; 1395 error = copyout(&ifmr->ifm_current, 1396 ifmr->ifm_ulist, 1397 sizeof(int)); 1398 } 1399 } 1400 } else { 1401 VLAN_UNLOCK(); 1402 error = EINVAL; 1403 } 1404 break; 1405 1406 case SIOCSIFMEDIA: 1407 error = EINVAL; 1408 break; 1409 1410 case SIOCSIFMTU: 1411 /* 1412 * Set the interface MTU. 1413 */ 1414 VLAN_LOCK(); 1415 if (TRUNK(ifv) != NULL) { 1416 if (ifr->ifr_mtu > 1417 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1418 ifr->ifr_mtu < 1419 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1420 error = EINVAL; 1421 else 1422 ifp->if_mtu = ifr->ifr_mtu; 1423 } else 1424 error = EINVAL; 1425 VLAN_UNLOCK(); 1426 break; 1427 1428 case SIOCSETVLAN: 1429 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1430 if (error) 1431 break; 1432 if (vlr.vlr_parent[0] == '\0') { 1433 vlan_unconfig(ifp); 1434 break; 1435 } 1436 p = ifunit(vlr.vlr_parent); 1437 if (p == NULL) { 1438 error = ENOENT; 1439 break; 1440 } 1441 /* 1442 * Don't let the caller set up a VLAN tag with 1443 * anything except VLID bits. 1444 */ 1445 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1446 error = EINVAL; 1447 break; 1448 } 1449 error = vlan_config(ifv, p, vlr.vlr_tag); 1450 if (error) 1451 break; 1452 1453 /* Update flags on the parent, if necessary. */ 1454 vlan_setflags(ifp, 1); 1455 break; 1456 1457 case SIOCGETVLAN: 1458 bzero(&vlr, sizeof(vlr)); 1459 VLAN_LOCK(); 1460 if (TRUNK(ifv) != NULL) { 1461 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1462 sizeof(vlr.vlr_parent)); 1463 vlr.vlr_tag = ifv->ifv_tag; 1464 } 1465 VLAN_UNLOCK(); 1466 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1467 break; 1468 1469 case SIOCSIFFLAGS: 1470 /* 1471 * We should propagate selected flags to the parent, 1472 * e.g., promiscuous mode. 1473 */ 1474 if (TRUNK(ifv) != NULL) 1475 error = vlan_setflags(ifp, 1); 1476 break; 1477 1478 case SIOCADDMULTI: 1479 case SIOCDELMULTI: 1480 /* 1481 * If we don't have a parent, just remember the membership for 1482 * when we do. 1483 */ 1484 if (TRUNK(ifv) != NULL) 1485 error = vlan_setmulti(ifp); 1486 break; 1487 1488 default: 1489 error = ether_ioctl(ifp, cmd, data); 1490 } 1491 1492 return (error); 1493} 1494