if_vlan.c revision 225736
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: stable/9/sys/net/if_vlan.c 219819 2011-03-21 09:40:01Z jeff $"); 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#include <sys/sx.h> 60 61#include <net/bpf.h> 62#include <net/ethernet.h> 63#include <net/if.h> 64#include <net/if_clone.h> 65#include <net/if_dl.h> 66#include <net/if_types.h> 67#include <net/if_vlan_var.h> 68#include <net/vnet.h> 69 70#define VLANNAME "vlan" 71#define VLAN_DEF_HWIDTH 4 72#define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 73 74#define UP_AND_RUNNING(ifp) \ 75 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 76 77LIST_HEAD(ifvlanhead, ifvlan); 78 79struct ifvlantrunk { 80 struct ifnet *parent; /* parent interface of this trunk */ 81 struct rwlock rw; 82#ifdef VLAN_ARRAY 83#define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 84 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 85#else 86 struct ifvlanhead *hash; /* dynamic hash-list table */ 87 uint16_t hmask; 88 uint16_t hwidth; 89#endif 90 int refcnt; 91}; 92 93struct vlan_mc_entry { 94 struct sockaddr_dl mc_addr; 95 SLIST_ENTRY(vlan_mc_entry) mc_entries; 96}; 97 98struct ifvlan { 99 struct ifvlantrunk *ifv_trunk; 100 struct ifnet *ifv_ifp; 101 void *ifv_cookie; 102#define TRUNK(ifv) ((ifv)->ifv_trunk) 103#define PARENT(ifv) ((ifv)->ifv_trunk->parent) 104 int ifv_pflags; /* special flags we have set on parent */ 105 struct ifv_linkmib { 106 int ifvm_encaplen; /* encapsulation length */ 107 int ifvm_mtufudge; /* MTU fudged by this much */ 108 int ifvm_mintu; /* min transmission unit */ 109 uint16_t ifvm_proto; /* encapsulation ethertype */ 110 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 111 } ifv_mib; 112 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 113#ifndef VLAN_ARRAY 114 LIST_ENTRY(ifvlan) ifv_list; 115#endif 116}; 117#define ifv_proto ifv_mib.ifvm_proto 118#define ifv_tag ifv_mib.ifvm_tag 119#define ifv_encaplen ifv_mib.ifvm_encaplen 120#define ifv_mtufudge ifv_mib.ifvm_mtufudge 121#define ifv_mintu ifv_mib.ifvm_mintu 122 123/* Special flags we should propagate to parent. */ 124static struct { 125 int flag; 126 int (*func)(struct ifnet *, int); 127} vlan_pflags[] = { 128 {IFF_PROMISC, ifpromisc}, 129 {IFF_ALLMULTI, if_allmulti}, 130 {0, NULL} 131}; 132 133SYSCTL_DECL(_net_link); 134SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 135SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 136 137static int soft_pad = 0; 138SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 139 "pad short frames before tagging"); 140 141static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 142 143static eventhandler_tag ifdetach_tag; 144static eventhandler_tag iflladdr_tag; 145 146/* 147 * We have a global mutex, that is used to serialize configuration 148 * changes and isn't used in normal packet delivery. 149 * 150 * We also have a per-trunk rwlock, that is locked shared on packet 151 * processing and exclusive when configuration is changed. 152 * 153 * The VLAN_ARRAY substitutes the dynamic hash with a static array 154 * with 4096 entries. In theory this can give a boost in processing, 155 * however on practice it does not. Probably this is because array 156 * is too big to fit into CPU cache. 157 */ 158static struct sx ifv_lock; 159#define VLAN_LOCK_INIT() sx_init(&ifv_lock, "vlan_global") 160#define VLAN_LOCK_DESTROY() sx_destroy(&ifv_lock) 161#define VLAN_LOCK_ASSERT() sx_assert(&ifv_lock, SA_LOCKED) 162#define VLAN_LOCK() sx_xlock(&ifv_lock) 163#define VLAN_UNLOCK() sx_xunlock(&ifv_lock) 164#define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 165#define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 166#define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 167#define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 168#define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 169#define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 170#define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 171#define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 172 173#ifndef VLAN_ARRAY 174static void vlan_inithash(struct ifvlantrunk *trunk); 175static void vlan_freehash(struct ifvlantrunk *trunk); 176static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 177static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 178static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 179static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 180 uint16_t tag); 181#endif 182static void trunk_destroy(struct ifvlantrunk *trunk); 183 184static void vlan_start(struct ifnet *ifp); 185static void vlan_init(void *foo); 186static void vlan_input(struct ifnet *ifp, struct mbuf *m); 187static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 188static int vlan_setflag(struct ifnet *ifp, int flag, int status, 189 int (*func)(struct ifnet *, int)); 190static int vlan_setflags(struct ifnet *ifp, int status); 191static int vlan_setmulti(struct ifnet *ifp); 192static void vlan_unconfig(struct ifnet *ifp); 193static void vlan_unconfig_locked(struct ifnet *ifp); 194static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 195static void vlan_link_state(struct ifnet *ifp); 196static void vlan_capabilities(struct ifvlan *ifv); 197static void vlan_trunk_capabilities(struct ifnet *ifp); 198 199static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 200 const char *, int *); 201static int vlan_clone_match(struct if_clone *, const char *); 202static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 203static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 204 205static void vlan_ifdetach(void *arg, struct ifnet *ifp); 206static void vlan_iflladdr(void *arg, struct ifnet *ifp); 207 208static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 209 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 210 211#ifdef VIMAGE 212static VNET_DEFINE(struct if_clone, vlan_cloner); 213#define V_vlan_cloner VNET(vlan_cloner) 214#endif 215 216#ifndef VLAN_ARRAY 217#define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 218 219static void 220vlan_inithash(struct ifvlantrunk *trunk) 221{ 222 int i, n; 223 224 /* 225 * The trunk must not be locked here since we call malloc(M_WAITOK). 226 * It is OK in case this function is called before the trunk struct 227 * gets hooked up and becomes visible from other threads. 228 */ 229 230 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 231 ("%s: hash already initialized", __func__)); 232 233 trunk->hwidth = VLAN_DEF_HWIDTH; 234 n = 1 << trunk->hwidth; 235 trunk->hmask = n - 1; 236 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 237 for (i = 0; i < n; i++) 238 LIST_INIT(&trunk->hash[i]); 239} 240 241static void 242vlan_freehash(struct ifvlantrunk *trunk) 243{ 244#ifdef INVARIANTS 245 int i; 246 247 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 248 for (i = 0; i < (1 << trunk->hwidth); i++) 249 KASSERT(LIST_EMPTY(&trunk->hash[i]), 250 ("%s: hash table not empty", __func__)); 251#endif 252 free(trunk->hash, M_VLAN); 253 trunk->hash = NULL; 254 trunk->hwidth = trunk->hmask = 0; 255} 256 257static int 258vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 259{ 260 int i, b; 261 struct ifvlan *ifv2; 262 263 TRUNK_LOCK_ASSERT(trunk); 264 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 265 266 b = 1 << trunk->hwidth; 267 i = HASH(ifv->ifv_tag, trunk->hmask); 268 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 269 if (ifv->ifv_tag == ifv2->ifv_tag) 270 return (EEXIST); 271 272 /* 273 * Grow the hash when the number of vlans exceeds half of the number of 274 * hash buckets squared. This will make the average linked-list length 275 * buckets/2. 276 */ 277 if (trunk->refcnt > (b * b) / 2) { 278 vlan_growhash(trunk, 1); 279 i = HASH(ifv->ifv_tag, trunk->hmask); 280 } 281 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 282 trunk->refcnt++; 283 284 return (0); 285} 286 287static int 288vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 289{ 290 int i, b; 291 struct ifvlan *ifv2; 292 293 TRUNK_LOCK_ASSERT(trunk); 294 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 295 296 b = 1 << trunk->hwidth; 297 i = HASH(ifv->ifv_tag, trunk->hmask); 298 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 299 if (ifv2 == ifv) { 300 trunk->refcnt--; 301 LIST_REMOVE(ifv2, ifv_list); 302 if (trunk->refcnt < (b * b) / 2) 303 vlan_growhash(trunk, -1); 304 return (0); 305 } 306 307 panic("%s: vlan not found\n", __func__); 308 return (ENOENT); /*NOTREACHED*/ 309} 310 311/* 312 * Grow the hash larger or smaller if memory permits. 313 */ 314static void 315vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 316{ 317 struct ifvlan *ifv; 318 struct ifvlanhead *hash2; 319 int hwidth2, i, j, n, n2; 320 321 TRUNK_LOCK_ASSERT(trunk); 322 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 323 324 if (howmuch == 0) { 325 /* Harmless yet obvious coding error */ 326 printf("%s: howmuch is 0\n", __func__); 327 return; 328 } 329 330 hwidth2 = trunk->hwidth + howmuch; 331 n = 1 << trunk->hwidth; 332 n2 = 1 << hwidth2; 333 /* Do not shrink the table below the default */ 334 if (hwidth2 < VLAN_DEF_HWIDTH) 335 return; 336 337 /* M_NOWAIT because we're called with trunk mutex held */ 338 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 339 if (hash2 == NULL) { 340 printf("%s: out of memory -- hash size not changed\n", 341 __func__); 342 return; /* We can live with the old hash table */ 343 } 344 for (j = 0; j < n2; j++) 345 LIST_INIT(&hash2[j]); 346 for (i = 0; i < n; i++) 347 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 348 LIST_REMOVE(ifv, ifv_list); 349 j = HASH(ifv->ifv_tag, n2 - 1); 350 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 351 } 352 free(trunk->hash, M_VLAN); 353 trunk->hash = hash2; 354 trunk->hwidth = hwidth2; 355 trunk->hmask = n2 - 1; 356 357 if (bootverbose) 358 if_printf(trunk->parent, 359 "VLAN hash table resized from %d to %d buckets\n", n, n2); 360} 361 362static __inline struct ifvlan * 363vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 364{ 365 struct ifvlan *ifv; 366 367 TRUNK_LOCK_RASSERT(trunk); 368 369 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 370 if (ifv->ifv_tag == tag) 371 return (ifv); 372 return (NULL); 373} 374 375#if 0 376/* Debugging code to view the hashtables. */ 377static void 378vlan_dumphash(struct ifvlantrunk *trunk) 379{ 380 int i; 381 struct ifvlan *ifv; 382 383 for (i = 0; i < (1 << trunk->hwidth); i++) { 384 printf("%d: ", i); 385 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 386 printf("%s ", ifv->ifv_ifp->if_xname); 387 printf("\n"); 388 } 389} 390#endif /* 0 */ 391#else 392 393static __inline struct ifvlan * 394vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 395{ 396 397 return trunk->vlans[tag]; 398} 399 400static __inline int 401vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 402{ 403 404 if (trunk->vlans[ifv->ifv_tag] != NULL) 405 return EEXIST; 406 trunk->vlans[ifv->ifv_tag] = ifv; 407 trunk->refcnt++; 408 409 return (0); 410} 411 412static __inline int 413vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 414{ 415 416 trunk->vlans[ifv->ifv_tag] = NULL; 417 trunk->refcnt--; 418 419 return (0); 420} 421 422static __inline void 423vlan_freehash(struct ifvlantrunk *trunk) 424{ 425} 426 427static __inline void 428vlan_inithash(struct ifvlantrunk *trunk) 429{ 430} 431 432#endif /* !VLAN_ARRAY */ 433 434static void 435trunk_destroy(struct ifvlantrunk *trunk) 436{ 437 VLAN_LOCK_ASSERT(); 438 439 TRUNK_LOCK(trunk); 440 vlan_freehash(trunk); 441 trunk->parent->if_vlantrunk = NULL; 442 TRUNK_UNLOCK(trunk); 443 TRUNK_LOCK_DESTROY(trunk); 444 free(trunk, M_VLAN); 445} 446 447/* 448 * Program our multicast filter. What we're actually doing is 449 * programming the multicast filter of the parent. This has the 450 * side effect of causing the parent interface to receive multicast 451 * traffic that it doesn't really want, which ends up being discarded 452 * later by the upper protocol layers. Unfortunately, there's no way 453 * to avoid this: there really is only one physical interface. 454 * 455 * XXX: There is a possible race here if more than one thread is 456 * modifying the multicast state of the vlan interface at the same time. 457 */ 458static int 459vlan_setmulti(struct ifnet *ifp) 460{ 461 struct ifnet *ifp_p; 462 struct ifmultiaddr *ifma, *rifma = NULL; 463 struct ifvlan *sc; 464 struct vlan_mc_entry *mc; 465 int error; 466 467 /*VLAN_LOCK_ASSERT();*/ 468 469 /* Find the parent. */ 470 sc = ifp->if_softc; 471 ifp_p = PARENT(sc); 472 473 CURVNET_SET_QUIET(ifp_p->if_vnet); 474 475 /* First, remove any existing filter entries. */ 476 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 477 error = if_delmulti(ifp_p, (struct sockaddr *)&mc->mc_addr); 478 if (error) 479 return (error); 480 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 481 free(mc, M_VLAN); 482 } 483 484 /* Now program new ones. */ 485 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 486 if (ifma->ifma_addr->sa_family != AF_LINK) 487 continue; 488 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 489 if (mc == NULL) 490 return (ENOMEM); 491 bcopy(ifma->ifma_addr, &mc->mc_addr, ifma->ifma_addr->sa_len); 492 mc->mc_addr.sdl_index = ifp_p->if_index; 493 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 494 error = if_addmulti(ifp_p, (struct sockaddr *)&mc->mc_addr, 495 &rifma); 496 if (error) 497 return (error); 498 } 499 500 CURVNET_RESTORE(); 501 return (0); 502} 503 504/* 505 * A handler for parent interface link layer address changes. 506 * If the parent interface link layer address is changed we 507 * should also change it on all children vlans. 508 */ 509static void 510vlan_iflladdr(void *arg __unused, struct ifnet *ifp) 511{ 512 struct ifvlan *ifv; 513#ifndef VLAN_ARRAY 514 struct ifvlan *next; 515#endif 516 int i; 517 518 /* 519 * Check if it's a trunk interface first of all 520 * to avoid needless locking. 521 */ 522 if (ifp->if_vlantrunk == NULL) 523 return; 524 525 VLAN_LOCK(); 526 /* 527 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it. 528 */ 529#ifdef VLAN_ARRAY 530 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 531 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 532#else /* VLAN_ARRAY */ 533 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 534 LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) { 535#endif /* VLAN_ARRAY */ 536 VLAN_UNLOCK(); 537 if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), 538 ifp->if_addrlen); 539 VLAN_LOCK(); 540 } 541 VLAN_UNLOCK(); 542 543} 544 545/* 546 * A handler for network interface departure events. 547 * Track departure of trunks here so that we don't access invalid 548 * pointers or whatever if a trunk is ripped from under us, e.g., 549 * by ejecting its hot-plug card. However, if an ifnet is simply 550 * being renamed, then there's no need to tear down the state. 551 */ 552static void 553vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 554{ 555 struct ifvlan *ifv; 556 int i; 557 558 /* 559 * Check if it's a trunk interface first of all 560 * to avoid needless locking. 561 */ 562 if (ifp->if_vlantrunk == NULL) 563 return; 564 565 /* If the ifnet is just being renamed, don't do anything. */ 566 if (ifp->if_flags & IFF_RENAMING) 567 return; 568 569 VLAN_LOCK(); 570 /* 571 * OK, it's a trunk. Loop over and detach all vlan's on it. 572 * Check trunk pointer after each vlan_unconfig() as it will 573 * free it and set to NULL after the last vlan was detached. 574 */ 575#ifdef VLAN_ARRAY 576 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 577 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 578 vlan_unconfig_locked(ifv->ifv_ifp); 579 if (ifp->if_vlantrunk == NULL) 580 break; 581 } 582#else /* VLAN_ARRAY */ 583restart: 584 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 585 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 586 vlan_unconfig_locked(ifv->ifv_ifp); 587 if (ifp->if_vlantrunk) 588 goto restart; /* trunk->hwidth can change */ 589 else 590 break; 591 } 592#endif /* VLAN_ARRAY */ 593 /* Trunk should have been destroyed in vlan_unconfig(). */ 594 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 595 VLAN_UNLOCK(); 596} 597 598/* 599 * Return the trunk device for a virtual interface. 600 */ 601static struct ifnet * 602vlan_trunkdev(struct ifnet *ifp) 603{ 604 struct ifvlan *ifv; 605 606 if (ifp->if_type != IFT_L2VLAN) 607 return (NULL); 608 ifv = ifp->if_softc; 609 ifp = NULL; 610 VLAN_LOCK(); 611 if (ifv->ifv_trunk) 612 ifp = PARENT(ifv); 613 VLAN_UNLOCK(); 614 return (ifp); 615} 616 617/* 618 * Return the 16bit vlan tag for this interface. 619 */ 620static int 621vlan_tag(struct ifnet *ifp, uint16_t *tagp) 622{ 623 struct ifvlan *ifv; 624 625 if (ifp->if_type != IFT_L2VLAN) 626 return (EINVAL); 627 ifv = ifp->if_softc; 628 *tagp = ifv->ifv_tag; 629 return (0); 630} 631 632/* 633 * Return a driver specific cookie for this interface. Synchronization 634 * with setcookie must be provided by the driver. 635 */ 636static void * 637vlan_cookie(struct ifnet *ifp) 638{ 639 struct ifvlan *ifv; 640 641 if (ifp->if_type != IFT_L2VLAN) 642 return (NULL); 643 ifv = ifp->if_softc; 644 return (ifv->ifv_cookie); 645} 646 647/* 648 * Store a cookie in our softc that drivers can use to store driver 649 * private per-instance data in. 650 */ 651static int 652vlan_setcookie(struct ifnet *ifp, void *cookie) 653{ 654 struct ifvlan *ifv; 655 656 if (ifp->if_type != IFT_L2VLAN) 657 return (EINVAL); 658 ifv = ifp->if_softc; 659 ifv->ifv_cookie = cookie; 660 return (0); 661} 662 663/* 664 * Return the vlan device present at the specific tag. 665 */ 666static struct ifnet * 667vlan_devat(struct ifnet *ifp, uint16_t tag) 668{ 669 struct ifvlantrunk *trunk; 670 struct ifvlan *ifv; 671 672 trunk = ifp->if_vlantrunk; 673 if (trunk == NULL) 674 return (NULL); 675 ifp = NULL; 676 TRUNK_RLOCK(trunk); 677 ifv = vlan_gethash(trunk, tag); 678 if (ifv) 679 ifp = ifv->ifv_ifp; 680 TRUNK_RUNLOCK(trunk); 681 return (ifp); 682} 683 684/* 685 * VLAN support can be loaded as a module. The only place in the 686 * system that's intimately aware of this is ether_input. We hook 687 * into this code through vlan_input_p which is defined there and 688 * set here. Noone else in the system should be aware of this so 689 * we use an explicit reference here. 690 */ 691extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 692 693/* For if_link_state_change() eyes only... */ 694extern void (*vlan_link_state_p)(struct ifnet *); 695 696static int 697vlan_modevent(module_t mod, int type, void *data) 698{ 699 700 switch (type) { 701 case MOD_LOAD: 702 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 703 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 704 if (ifdetach_tag == NULL) 705 return (ENOMEM); 706 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 707 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 708 if (iflladdr_tag == NULL) 709 return (ENOMEM); 710 VLAN_LOCK_INIT(); 711 vlan_input_p = vlan_input; 712 vlan_link_state_p = vlan_link_state; 713 vlan_trunk_cap_p = vlan_trunk_capabilities; 714 vlan_trunkdev_p = vlan_trunkdev; 715 vlan_cookie_p = vlan_cookie; 716 vlan_setcookie_p = vlan_setcookie; 717 vlan_tag_p = vlan_tag; 718 vlan_devat_p = vlan_devat; 719#ifndef VIMAGE 720 if_clone_attach(&vlan_cloner); 721#endif 722 if (bootverbose) 723 printf("vlan: initialized, using " 724#ifdef VLAN_ARRAY 725 "full-size arrays" 726#else 727 "hash tables with chaining" 728#endif 729 730 "\n"); 731 break; 732 case MOD_UNLOAD: 733#ifndef VIMAGE 734 if_clone_detach(&vlan_cloner); 735#endif 736 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 737 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag); 738 vlan_input_p = NULL; 739 vlan_link_state_p = NULL; 740 vlan_trunk_cap_p = NULL; 741 vlan_trunkdev_p = NULL; 742 vlan_tag_p = NULL; 743 vlan_cookie_p = vlan_cookie; 744 vlan_setcookie_p = vlan_setcookie; 745 vlan_devat_p = NULL; 746 VLAN_LOCK_DESTROY(); 747 if (bootverbose) 748 printf("vlan: unloaded\n"); 749 break; 750 default: 751 return (EOPNOTSUPP); 752 } 753 return (0); 754} 755 756static moduledata_t vlan_mod = { 757 "if_vlan", 758 vlan_modevent, 759 0 760}; 761 762DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 763MODULE_VERSION(if_vlan, 3); 764 765#ifdef VIMAGE 766static void 767vnet_vlan_init(const void *unused __unused) 768{ 769 770 V_vlan_cloner = vlan_cloner; 771 if_clone_attach(&V_vlan_cloner); 772} 773VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 774 vnet_vlan_init, NULL); 775 776static void 777vnet_vlan_uninit(const void *unused __unused) 778{ 779 780 if_clone_detach(&V_vlan_cloner); 781} 782VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 783 vnet_vlan_uninit, NULL); 784#endif 785 786static struct ifnet * 787vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 788{ 789 const char *cp; 790 struct ifnet *ifp; 791 int t; 792 793 /* Check for <etherif>.<vlan> style interface names. */ 794 IFNET_RLOCK_NOSLEEP(); 795 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 796 /* 797 * We can handle non-ethernet hardware types as long as 798 * they handle the tagging and headers themselves. 799 */ 800 if (ifp->if_type != IFT_ETHER && 801 (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) 802 continue; 803 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 804 continue; 805 cp = name + strlen(ifp->if_xname); 806 if (*cp++ != '.') 807 continue; 808 if (*cp == '\0') 809 continue; 810 t = 0; 811 for(; *cp >= '0' && *cp <= '9'; cp++) 812 t = (t * 10) + (*cp - '0'); 813 if (*cp != '\0') 814 continue; 815 if (tag != NULL) 816 *tag = t; 817 break; 818 } 819 IFNET_RUNLOCK_NOSLEEP(); 820 821 return (ifp); 822} 823 824static int 825vlan_clone_match(struct if_clone *ifc, const char *name) 826{ 827 const char *cp; 828 829 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 830 return (1); 831 832 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 833 return (0); 834 for (cp = name + 4; *cp != '\0'; cp++) { 835 if (*cp < '0' || *cp > '9') 836 return (0); 837 } 838 839 return (1); 840} 841 842static int 843vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 844{ 845 char *dp; 846 int wildcard; 847 int unit; 848 int error; 849 int tag; 850 int ethertag; 851 struct ifvlan *ifv; 852 struct ifnet *ifp; 853 struct ifnet *p; 854 struct ifaddr *ifa; 855 struct sockaddr_dl *sdl; 856 struct vlanreq vlr; 857 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 858 859 /* 860 * There are 3 (ugh) ways to specify the cloned device: 861 * o pass a parameter block with the clone request. 862 * o specify parameters in the text of the clone device name 863 * o specify no parameters and get an unattached device that 864 * must be configured separately. 865 * The first technique is preferred; the latter two are 866 * supported for backwards compatibilty. 867 */ 868 if (params) { 869 error = copyin(params, &vlr, sizeof(vlr)); 870 if (error) 871 return error; 872 p = ifunit(vlr.vlr_parent); 873 if (p == NULL) 874 return ENXIO; 875 /* 876 * Don't let the caller set up a VLAN tag with 877 * anything except VLID bits. 878 */ 879 if (vlr.vlr_tag & ~EVL_VLID_MASK) 880 return (EINVAL); 881 error = ifc_name2unit(name, &unit); 882 if (error != 0) 883 return (error); 884 885 ethertag = 1; 886 tag = vlr.vlr_tag; 887 wildcard = (unit < 0); 888 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 889 ethertag = 1; 890 unit = -1; 891 wildcard = 0; 892 893 /* 894 * Don't let the caller set up a VLAN tag with 895 * anything except VLID bits. 896 */ 897 if (tag & ~EVL_VLID_MASK) 898 return (EINVAL); 899 } else { 900 ethertag = 0; 901 902 error = ifc_name2unit(name, &unit); 903 if (error != 0) 904 return (error); 905 906 wildcard = (unit < 0); 907 } 908 909 error = ifc_alloc_unit(ifc, &unit); 910 if (error != 0) 911 return (error); 912 913 /* In the wildcard case, we need to update the name. */ 914 if (wildcard) { 915 for (dp = name; *dp != '\0'; dp++); 916 if (snprintf(dp, len - (dp-name), "%d", unit) > 917 len - (dp-name) - 1) { 918 panic("%s: interface name too long", __func__); 919 } 920 } 921 922 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 923 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 924 if (ifp == NULL) { 925 ifc_free_unit(ifc, unit); 926 free(ifv, M_VLAN); 927 return (ENOSPC); 928 } 929 SLIST_INIT(&ifv->vlan_mc_listhead); 930 931 ifp->if_softc = ifv; 932 /* 933 * Set the name manually rather than using if_initname because 934 * we don't conform to the default naming convention for interfaces. 935 */ 936 strlcpy(ifp->if_xname, name, IFNAMSIZ); 937 ifp->if_dname = ifc->ifc_name; 938 ifp->if_dunit = unit; 939 /* NB: flags are not set here */ 940 ifp->if_linkmib = &ifv->ifv_mib; 941 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 942 /* NB: mtu is not set here */ 943 944 ifp->if_init = vlan_init; 945 ifp->if_start = vlan_start; 946 ifp->if_ioctl = vlan_ioctl; 947 ifp->if_snd.ifq_maxlen = ifqmaxlen; 948 ifp->if_flags = VLAN_IFFLAGS; 949 ether_ifattach(ifp, eaddr); 950 /* Now undo some of the damage... */ 951 ifp->if_baudrate = 0; 952 ifp->if_type = IFT_L2VLAN; 953 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 954 ifa = ifp->if_addr; 955 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 956 sdl->sdl_type = IFT_L2VLAN; 957 958 if (ethertag) { 959 error = vlan_config(ifv, p, tag); 960 if (error != 0) { 961 /* 962 * Since we've partialy failed, we need to back 963 * out all the way, otherwise userland could get 964 * confused. Thus, we destroy the interface. 965 */ 966 ether_ifdetach(ifp); 967 vlan_unconfig(ifp); 968 if_free_type(ifp, IFT_ETHER); 969 ifc_free_unit(ifc, unit); 970 free(ifv, M_VLAN); 971 972 return (error); 973 } 974 975 /* Update flags on the parent, if necessary. */ 976 vlan_setflags(ifp, 1); 977 } 978 979 return (0); 980} 981 982static int 983vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 984{ 985 struct ifvlan *ifv = ifp->if_softc; 986 int unit = ifp->if_dunit; 987 988 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 989 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 990 if_free_type(ifp, IFT_ETHER); 991 free(ifv, M_VLAN); 992 ifc_free_unit(ifc, unit); 993 994 return (0); 995} 996 997/* 998 * The ifp->if_init entry point for vlan(4) is a no-op. 999 */ 1000static void 1001vlan_init(void *foo __unused) 1002{ 1003} 1004 1005/* 1006 * The if_start method for vlan(4) interface. It doesn't 1007 * raises the IFF_DRV_OACTIVE flag, since it is called 1008 * only from IFQ_HANDOFF() macro in ether_output_frame(). 1009 * If the interface queue is full, and vlan_start() is 1010 * not called, the queue would never get emptied and 1011 * interface would stall forever. 1012 */ 1013static void 1014vlan_start(struct ifnet *ifp) 1015{ 1016 struct ifvlan *ifv; 1017 struct ifnet *p; 1018 struct mbuf *m; 1019 int error; 1020 1021 ifv = ifp->if_softc; 1022 p = PARENT(ifv); 1023 1024 for (;;) { 1025 IF_DEQUEUE(&ifp->if_snd, m); 1026 if (m == NULL) 1027 break; 1028 BPF_MTAP(ifp, m); 1029 1030 /* 1031 * Do not run parent's if_start() if the parent is not up, 1032 * or parent's driver will cause a system crash. 1033 */ 1034 if (!UP_AND_RUNNING(p)) { 1035 m_freem(m); 1036 ifp->if_collisions++; 1037 continue; 1038 } 1039 1040 /* 1041 * Pad the frame to the minimum size allowed if told to. 1042 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 1043 * paragraph C.4.4.3.b. It can help to work around buggy 1044 * bridges that violate paragraph C.4.4.3.a from the same 1045 * document, i.e., fail to pad short frames after untagging. 1046 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 1047 * untagging it will produce a 62-byte frame, which is a runt 1048 * and requires padding. There are VLAN-enabled network 1049 * devices that just discard such runts instead or mishandle 1050 * them somehow. 1051 */ 1052 if (soft_pad && p->if_type == IFT_ETHER) { 1053 static char pad[8]; /* just zeros */ 1054 int n; 1055 1056 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 1057 n > 0; n -= sizeof(pad)) 1058 if (!m_append(m, min(n, sizeof(pad)), pad)) 1059 break; 1060 1061 if (n > 0) { 1062 if_printf(ifp, "cannot pad short frame\n"); 1063 ifp->if_oerrors++; 1064 m_freem(m); 1065 continue; 1066 } 1067 } 1068 1069 /* 1070 * If underlying interface can do VLAN tag insertion itself, 1071 * just pass the packet along. However, we need some way to 1072 * tell the interface where the packet came from so that it 1073 * knows how to find the VLAN tag to use, so we attach a 1074 * packet tag that holds it. 1075 */ 1076 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1077 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 1078 m->m_flags |= M_VLANTAG; 1079 } else { 1080 m = ether_vlanencap(m, ifv->ifv_tag); 1081 if (m == NULL) { 1082 if_printf(ifp, 1083 "unable to prepend VLAN header\n"); 1084 ifp->if_oerrors++; 1085 continue; 1086 } 1087 } 1088 1089 /* 1090 * Send it, precisely as ether_output() would have. 1091 * We are already running at splimp. 1092 */ 1093 error = (p->if_transmit)(p, m); 1094 if (!error) 1095 ifp->if_opackets++; 1096 else 1097 ifp->if_oerrors++; 1098 } 1099} 1100 1101static void 1102vlan_input(struct ifnet *ifp, struct mbuf *m) 1103{ 1104 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1105 struct ifvlan *ifv; 1106 uint16_t tag; 1107 1108 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 1109 1110 if (m->m_flags & M_VLANTAG) { 1111 /* 1112 * Packet is tagged, but m contains a normal 1113 * Ethernet frame; the tag is stored out-of-band. 1114 */ 1115 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 1116 m->m_flags &= ~M_VLANTAG; 1117 } else { 1118 struct ether_vlan_header *evl; 1119 1120 /* 1121 * Packet is tagged in-band as specified by 802.1q. 1122 */ 1123 switch (ifp->if_type) { 1124 case IFT_ETHER: 1125 if (m->m_len < sizeof(*evl) && 1126 (m = m_pullup(m, sizeof(*evl))) == NULL) { 1127 if_printf(ifp, "cannot pullup VLAN header\n"); 1128 return; 1129 } 1130 evl = mtod(m, struct ether_vlan_header *); 1131 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 1132 1133 /* 1134 * Remove the 802.1q header by copying the Ethernet 1135 * addresses over it and adjusting the beginning of 1136 * the data in the mbuf. The encapsulated Ethernet 1137 * type field is already in place. 1138 */ 1139 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 1140 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1141 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1142 break; 1143 1144 default: 1145#ifdef INVARIANTS 1146 panic("%s: %s has unsupported if_type %u", 1147 __func__, ifp->if_xname, ifp->if_type); 1148#endif 1149 m_freem(m); 1150 ifp->if_noproto++; 1151 return; 1152 } 1153 } 1154 1155 TRUNK_RLOCK(trunk); 1156 ifv = vlan_gethash(trunk, tag); 1157 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 1158 TRUNK_RUNLOCK(trunk); 1159 m_freem(m); 1160 ifp->if_noproto++; 1161 return; 1162 } 1163 TRUNK_RUNLOCK(trunk); 1164 1165 m->m_pkthdr.rcvif = ifv->ifv_ifp; 1166 ifv->ifv_ifp->if_ipackets++; 1167 1168 /* Pass it back through the parent's input routine. */ 1169 (*ifp->if_input)(ifv->ifv_ifp, m); 1170} 1171 1172static int 1173vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 1174{ 1175 struct ifvlantrunk *trunk; 1176 struct ifnet *ifp; 1177 int error = 0; 1178 1179 /* VID numbers 0x0 and 0xFFF are reserved */ 1180 if (tag == 0 || tag == 0xFFF) 1181 return (EINVAL); 1182 if (p->if_type != IFT_ETHER && 1183 (p->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) 1184 return (EPROTONOSUPPORT); 1185 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1186 return (EPROTONOSUPPORT); 1187 if (ifv->ifv_trunk) 1188 return (EBUSY); 1189 1190 if (p->if_vlantrunk == NULL) { 1191 trunk = malloc(sizeof(struct ifvlantrunk), 1192 M_VLAN, M_WAITOK | M_ZERO); 1193 vlan_inithash(trunk); 1194 VLAN_LOCK(); 1195 if (p->if_vlantrunk != NULL) { 1196 /* A race that that is very unlikely to be hit. */ 1197 vlan_freehash(trunk); 1198 free(trunk, M_VLAN); 1199 goto exists; 1200 } 1201 TRUNK_LOCK_INIT(trunk); 1202 TRUNK_LOCK(trunk); 1203 p->if_vlantrunk = trunk; 1204 trunk->parent = p; 1205 } else { 1206 VLAN_LOCK(); 1207exists: 1208 trunk = p->if_vlantrunk; 1209 TRUNK_LOCK(trunk); 1210 } 1211 1212 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1213 error = vlan_inshash(trunk, ifv); 1214 if (error) 1215 goto done; 1216 ifv->ifv_proto = ETHERTYPE_VLAN; 1217 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1218 ifv->ifv_mintu = ETHERMIN; 1219 ifv->ifv_pflags = 0; 1220 1221 /* 1222 * If the parent supports the VLAN_MTU capability, 1223 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1224 * use it. 1225 */ 1226 if (p->if_capenable & IFCAP_VLAN_MTU) { 1227 /* 1228 * No need to fudge the MTU since the parent can 1229 * handle extended frames. 1230 */ 1231 ifv->ifv_mtufudge = 0; 1232 } else { 1233 /* 1234 * Fudge the MTU by the encapsulation size. This 1235 * makes us incompatible with strictly compliant 1236 * 802.1Q implementations, but allows us to use 1237 * the feature with other NetBSD implementations, 1238 * which might still be useful. 1239 */ 1240 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1241 } 1242 1243 ifv->ifv_trunk = trunk; 1244 ifp = ifv->ifv_ifp; 1245 /* 1246 * Initialize fields from our parent. This duplicates some 1247 * work with ether_ifattach() but allows for non-ethernet 1248 * interfaces to also work. 1249 */ 1250 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1251 ifp->if_baudrate = p->if_baudrate; 1252 ifp->if_output = p->if_output; 1253 ifp->if_input = p->if_input; 1254 ifp->if_resolvemulti = p->if_resolvemulti; 1255 ifp->if_addrlen = p->if_addrlen; 1256 ifp->if_broadcastaddr = p->if_broadcastaddr; 1257 1258 /* 1259 * Copy only a selected subset of flags from the parent. 1260 * Other flags are none of our business. 1261 */ 1262#define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1263 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1264 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1265#undef VLAN_COPY_FLAGS 1266 1267 ifp->if_link_state = p->if_link_state; 1268 1269 vlan_capabilities(ifv); 1270 1271 /* 1272 * Set up our interface address to reflect the underlying 1273 * physical interface's. 1274 */ 1275 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen); 1276 ((struct sockaddr_dl *)ifp->if_addr->ifa_addr)->sdl_alen = 1277 p->if_addrlen; 1278 1279 /* 1280 * Configure multicast addresses that may already be 1281 * joined on the vlan device. 1282 */ 1283 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1284 1285 /* We are ready for operation now. */ 1286 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1287done: 1288 TRUNK_UNLOCK(trunk); 1289 if (error == 0) 1290 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1291 VLAN_UNLOCK(); 1292 1293 return (error); 1294} 1295 1296static void 1297vlan_unconfig(struct ifnet *ifp) 1298{ 1299 1300 VLAN_LOCK(); 1301 vlan_unconfig_locked(ifp); 1302 VLAN_UNLOCK(); 1303} 1304 1305static void 1306vlan_unconfig_locked(struct ifnet *ifp) 1307{ 1308 struct ifvlantrunk *trunk; 1309 struct vlan_mc_entry *mc; 1310 struct ifvlan *ifv; 1311 struct ifnet *parent; 1312 1313 VLAN_LOCK_ASSERT(); 1314 1315 ifv = ifp->if_softc; 1316 trunk = ifv->ifv_trunk; 1317 parent = NULL; 1318 1319 if (trunk != NULL) { 1320 1321 TRUNK_LOCK(trunk); 1322 parent = trunk->parent; 1323 1324 /* 1325 * Since the interface is being unconfigured, we need to 1326 * empty the list of multicast groups that we may have joined 1327 * while we were alive from the parent's list. 1328 */ 1329 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1330 /* 1331 * This may fail if the parent interface is 1332 * being detached. Regardless, we should do a 1333 * best effort to free this interface as much 1334 * as possible as all callers expect vlan 1335 * destruction to succeed. 1336 */ 1337 (void)if_delmulti(parent, 1338 (struct sockaddr *)&mc->mc_addr); 1339 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1340 free(mc, M_VLAN); 1341 } 1342 1343 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1344 vlan_remhash(trunk, ifv); 1345 ifv->ifv_trunk = NULL; 1346 1347 /* 1348 * Check if we were the last. 1349 */ 1350 if (trunk->refcnt == 0) { 1351 trunk->parent->if_vlantrunk = NULL; 1352 /* 1353 * XXXGL: If some ithread has already entered 1354 * vlan_input() and is now blocked on the trunk 1355 * lock, then it should preempt us right after 1356 * unlock and finish its work. Then we will acquire 1357 * lock again in trunk_destroy(). 1358 */ 1359 TRUNK_UNLOCK(trunk); 1360 trunk_destroy(trunk); 1361 } else 1362 TRUNK_UNLOCK(trunk); 1363 } 1364 1365 /* Disconnect from parent. */ 1366 if (ifv->ifv_pflags) 1367 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1368 ifp->if_mtu = ETHERMTU; 1369 ifp->if_link_state = LINK_STATE_UNKNOWN; 1370 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1371 1372 /* 1373 * Only dispatch an event if vlan was 1374 * attached, otherwise there is nothing 1375 * to cleanup anyway. 1376 */ 1377 if (parent != NULL) 1378 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1379} 1380 1381/* Handle a reference counted flag that should be set on the parent as well */ 1382static int 1383vlan_setflag(struct ifnet *ifp, int flag, int status, 1384 int (*func)(struct ifnet *, int)) 1385{ 1386 struct ifvlan *ifv; 1387 int error; 1388 1389 /* XXX VLAN_LOCK_ASSERT(); */ 1390 1391 ifv = ifp->if_softc; 1392 status = status ? (ifp->if_flags & flag) : 0; 1393 /* Now "status" contains the flag value or 0 */ 1394 1395 /* 1396 * See if recorded parent's status is different from what 1397 * we want it to be. If it is, flip it. We record parent's 1398 * status in ifv_pflags so that we won't clear parent's flag 1399 * we haven't set. In fact, we don't clear or set parent's 1400 * flags directly, but get or release references to them. 1401 * That's why we can be sure that recorded flags still are 1402 * in accord with actual parent's flags. 1403 */ 1404 if (status != (ifv->ifv_pflags & flag)) { 1405 error = (*func)(PARENT(ifv), status); 1406 if (error) 1407 return (error); 1408 ifv->ifv_pflags &= ~flag; 1409 ifv->ifv_pflags |= status; 1410 } 1411 return (0); 1412} 1413 1414/* 1415 * Handle IFF_* flags that require certain changes on the parent: 1416 * if "status" is true, update parent's flags respective to our if_flags; 1417 * if "status" is false, forcedly clear the flags set on parent. 1418 */ 1419static int 1420vlan_setflags(struct ifnet *ifp, int status) 1421{ 1422 int error, i; 1423 1424 for (i = 0; vlan_pflags[i].flag; i++) { 1425 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1426 status, vlan_pflags[i].func); 1427 if (error) 1428 return (error); 1429 } 1430 return (0); 1431} 1432 1433/* Inform all vlans that their parent has changed link state */ 1434static void 1435vlan_link_state(struct ifnet *ifp) 1436{ 1437 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1438 struct ifvlan *ifv; 1439 int i; 1440 1441 TRUNK_LOCK(trunk); 1442#ifdef VLAN_ARRAY 1443 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1444 if (trunk->vlans[i] != NULL) { 1445 ifv = trunk->vlans[i]; 1446#else 1447 for (i = 0; i < (1 << trunk->hwidth); i++) 1448 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1449#endif 1450 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1451 if_link_state_change(ifv->ifv_ifp, 1452 trunk->parent->if_link_state); 1453 } 1454 TRUNK_UNLOCK(trunk); 1455} 1456 1457static void 1458vlan_capabilities(struct ifvlan *ifv) 1459{ 1460 struct ifnet *p = PARENT(ifv); 1461 struct ifnet *ifp = ifv->ifv_ifp; 1462 1463 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1464 1465 /* 1466 * If the parent interface can do checksum offloading 1467 * on VLANs, then propagate its hardware-assisted 1468 * checksumming flags. Also assert that checksum 1469 * offloading requires hardware VLAN tagging. 1470 */ 1471 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1472 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1473 1474 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1475 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1476 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1477 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1478 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1479 } else { 1480 ifp->if_capenable = 0; 1481 ifp->if_hwassist = 0; 1482 } 1483 /* 1484 * If the parent interface can do TSO on VLANs then 1485 * propagate the hardware-assisted flag. TSO on VLANs 1486 * does not necessarily require hardware VLAN tagging. 1487 */ 1488 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1489 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1490 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1491 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1492 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1493 } else { 1494 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1495 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1496 } 1497} 1498 1499static void 1500vlan_trunk_capabilities(struct ifnet *ifp) 1501{ 1502 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1503 struct ifvlan *ifv; 1504 int i; 1505 1506 TRUNK_LOCK(trunk); 1507#ifdef VLAN_ARRAY 1508 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1509 if (trunk->vlans[i] != NULL) { 1510 ifv = trunk->vlans[i]; 1511#else 1512 for (i = 0; i < (1 << trunk->hwidth); i++) { 1513 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1514#endif 1515 vlan_capabilities(ifv); 1516 } 1517 TRUNK_UNLOCK(trunk); 1518} 1519 1520static int 1521vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1522{ 1523 struct ifnet *p; 1524 struct ifreq *ifr; 1525 struct ifaddr *ifa; 1526 struct ifvlan *ifv; 1527 struct vlanreq vlr; 1528 int error = 0; 1529 1530 ifr = (struct ifreq *)data; 1531 ifa = (struct ifaddr *) data; 1532 ifv = ifp->if_softc; 1533 1534 switch (cmd) { 1535 case SIOCSIFADDR: 1536 ifp->if_flags |= IFF_UP; 1537#ifdef INET 1538 if (ifa->ifa_addr->sa_family == AF_INET) 1539 arp_ifinit(ifp, ifa); 1540#endif 1541 break; 1542 case SIOCGIFADDR: 1543 { 1544 struct sockaddr *sa; 1545 1546 sa = (struct sockaddr *)&ifr->ifr_data; 1547 bcopy(IF_LLADDR(ifp), sa->sa_data, ifp->if_addrlen); 1548 } 1549 break; 1550 case SIOCGIFMEDIA: 1551 VLAN_LOCK(); 1552 if (TRUNK(ifv) != NULL) { 1553 p = PARENT(ifv); 1554 VLAN_UNLOCK(); 1555 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data); 1556 /* Limit the result to the parent's current config. */ 1557 if (error == 0) { 1558 struct ifmediareq *ifmr; 1559 1560 ifmr = (struct ifmediareq *)data; 1561 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1562 ifmr->ifm_count = 1; 1563 error = copyout(&ifmr->ifm_current, 1564 ifmr->ifm_ulist, 1565 sizeof(int)); 1566 } 1567 } 1568 } else { 1569 VLAN_UNLOCK(); 1570 error = EINVAL; 1571 } 1572 break; 1573 1574 case SIOCSIFMEDIA: 1575 error = EINVAL; 1576 break; 1577 1578 case SIOCSIFMTU: 1579 /* 1580 * Set the interface MTU. 1581 */ 1582 VLAN_LOCK(); 1583 if (TRUNK(ifv) != NULL) { 1584 if (ifr->ifr_mtu > 1585 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1586 ifr->ifr_mtu < 1587 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1588 error = EINVAL; 1589 else 1590 ifp->if_mtu = ifr->ifr_mtu; 1591 } else 1592 error = EINVAL; 1593 VLAN_UNLOCK(); 1594 break; 1595 1596 case SIOCSETVLAN: 1597#ifdef VIMAGE 1598 if (ifp->if_vnet != ifp->if_home_vnet) { 1599 error = EPERM; 1600 break; 1601 } 1602#endif 1603 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1604 if (error) 1605 break; 1606 if (vlr.vlr_parent[0] == '\0') { 1607 vlan_unconfig(ifp); 1608 break; 1609 } 1610 p = ifunit(vlr.vlr_parent); 1611 if (p == NULL) { 1612 error = ENOENT; 1613 break; 1614 } 1615 /* 1616 * Don't let the caller set up a VLAN tag with 1617 * anything except VLID bits. 1618 */ 1619 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1620 error = EINVAL; 1621 break; 1622 } 1623 error = vlan_config(ifv, p, vlr.vlr_tag); 1624 if (error) 1625 break; 1626 1627 /* Update flags on the parent, if necessary. */ 1628 vlan_setflags(ifp, 1); 1629 break; 1630 1631 case SIOCGETVLAN: 1632#ifdef VIMAGE 1633 if (ifp->if_vnet != ifp->if_home_vnet) { 1634 error = EPERM; 1635 break; 1636 } 1637#endif 1638 bzero(&vlr, sizeof(vlr)); 1639 VLAN_LOCK(); 1640 if (TRUNK(ifv) != NULL) { 1641 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1642 sizeof(vlr.vlr_parent)); 1643 vlr.vlr_tag = ifv->ifv_tag; 1644 } 1645 VLAN_UNLOCK(); 1646 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1647 break; 1648 1649 case SIOCSIFFLAGS: 1650 /* 1651 * We should propagate selected flags to the parent, 1652 * e.g., promiscuous mode. 1653 */ 1654 if (TRUNK(ifv) != NULL) 1655 error = vlan_setflags(ifp, 1); 1656 break; 1657 1658 case SIOCADDMULTI: 1659 case SIOCDELMULTI: 1660 /* 1661 * If we don't have a parent, just remember the membership for 1662 * when we do. 1663 */ 1664 if (TRUNK(ifv) != NULL) 1665 error = vlan_setmulti(ifp); 1666 break; 1667 1668 default: 1669 error = EINVAL; 1670 break; 1671 } 1672 1673 return (error); 1674} 1675