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("$FreeBSD$"); 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 77 LIST_HEAD(ifvlanhead, ifvlan); 78 79 struct 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 93 struct vlan_mc_entry { 94 struct sockaddr_dl mc_addr; 95 SLIST_ENTRY(vlan_mc_entry) mc_entries; 96 }; 97 98 struct 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. */ 124 static 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 }; 132 133 SYSCTL_DECL(_net_link); 134 static SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, 135 "IEEE 802.1Q VLAN"); 136 static SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, 137 "for consistency"); 138 139 static int soft_pad = 0; 140 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 141 "pad short frames before tagging"); 142 143 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 144 145 static eventhandler_tag ifdetach_tag; 146 static eventhandler_tag iflladdr_tag; 147 148 /* 149 * We have a global mutex, that is used to serialize configuration 150 * changes and isn't used in normal packet delivery. 151 * 152 * We also have a per-trunk rwlock, that is locked shared on packet 153 * processing and exclusive when configuration is changed. 154 * 155 * The VLAN_ARRAY substitutes the dynamic hash with a static array 156 * with 4096 entries. In theory this can give a boost in processing, 157 * however on practice it does not. Probably this is because array 158 * is too big to fit into CPU cache. 159 */ 160 static struct sx ifv_lock; 161 #define VLAN_LOCK_INIT() sx_init(&ifv_lock, "vlan_global") 162 #define VLAN_LOCK_DESTROY() sx_destroy(&ifv_lock) 163 #define VLAN_LOCK_ASSERT() sx_assert(&ifv_lock, SA_LOCKED) 164 #define VLAN_LOCK() sx_xlock(&ifv_lock) 165 #define VLAN_UNLOCK() sx_xunlock(&ifv_lock) 166 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 167 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 168 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 169 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 170 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 171 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 172 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 173 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 174 175 #ifndef VLAN_ARRAY 176 static void vlan_inithash(struct ifvlantrunk *trunk); 177 static void vlan_freehash(struct ifvlantrunk *trunk); 178 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 179 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 180 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 181 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 182 uint16_t tag); 183 #endif 184 static void trunk_destroy(struct ifvlantrunk *trunk); 185 186 static void vlan_start(struct ifnet *ifp); 187 static void vlan_init(void *foo); 188 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 189 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 190 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 191 int (*func)(struct ifnet *, int)); 192 static int vlan_setflags(struct ifnet *ifp, int status); 193 static int vlan_setmulti(struct ifnet *ifp); 194 static void vlan_unconfig(struct ifnet *ifp); 195 static void vlan_unconfig_locked(struct ifnet *ifp); 196 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 197 static void vlan_link_state(struct ifnet *ifp); 198 static void vlan_capabilities(struct ifvlan *ifv); 199 static void vlan_trunk_capabilities(struct ifnet *ifp); 200 201 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 202 const char *, int *); 203 static int vlan_clone_match(struct if_clone *, const char *); 204 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 205 static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 206 207 static void vlan_ifdetach(void *arg, struct ifnet *ifp); 208 static void vlan_iflladdr(void *arg, struct ifnet *ifp); 209 210 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 211 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 212 213 #ifdef VIMAGE 214 static VNET_DEFINE(struct if_clone, vlan_cloner); 215 #define V_vlan_cloner VNET(vlan_cloner) 216 #endif 217 218 #ifndef VLAN_ARRAY 219 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 220 221 static void 222 vlan_inithash(struct ifvlantrunk *trunk) 223 { 224 int i, n; 225 226 /* 227 * The trunk must not be locked here since we call malloc(M_WAITOK). 228 * It is OK in case this function is called before the trunk struct 229 * gets hooked up and becomes visible from other threads. 230 */ 231 232 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 233 ("%s: hash already initialized", __func__)); 234 235 trunk->hwidth = VLAN_DEF_HWIDTH; 236 n = 1 << trunk->hwidth; 237 trunk->hmask = n - 1; 238 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 239 for (i = 0; i < n; i++) 240 LIST_INIT(&trunk->hash[i]); 241 } 242 243 static void 244 vlan_freehash(struct ifvlantrunk *trunk) 245 { 246 #ifdef INVARIANTS 247 int i; 248 249 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 250 for (i = 0; i < (1 << trunk->hwidth); i++) 251 KASSERT(LIST_EMPTY(&trunk->hash[i]), 252 ("%s: hash table not empty", __func__)); 253 #endif 254 free(trunk->hash, M_VLAN); 255 trunk->hash = NULL; 256 trunk->hwidth = trunk->hmask = 0; 257 } 258 259 static int 260 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 261 { 262 int i, b; 263 struct ifvlan *ifv2; 264 265 TRUNK_LOCK_ASSERT(trunk); 266 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 267 268 b = 1 << trunk->hwidth; 269 i = HASH(ifv->ifv_tag, trunk->hmask); 270 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 271 if (ifv->ifv_tag == ifv2->ifv_tag) 272 return (EEXIST); 273 274 /* 275 * Grow the hash when the number of vlans exceeds half of the number of 276 * hash buckets squared. This will make the average linked-list length 277 * buckets/2. 278 */ 279 if (trunk->refcnt > (b * b) / 2) { 280 vlan_growhash(trunk, 1); 281 i = HASH(ifv->ifv_tag, trunk->hmask); 282 } 283 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 284 trunk->refcnt++; 285 286 return (0); 287 } 288 289 static int 290 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 291 { 292 int i, b; 293 struct ifvlan *ifv2; 294 295 TRUNK_LOCK_ASSERT(trunk); 296 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 297 298 b = 1 << trunk->hwidth; 299 i = HASH(ifv->ifv_tag, trunk->hmask); 300 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 301 if (ifv2 == ifv) { 302 trunk->refcnt--; 303 LIST_REMOVE(ifv2, ifv_list); 304 if (trunk->refcnt < (b * b) / 2) 305 vlan_growhash(trunk, -1); 306 return (0); 307 } 308 309 panic("%s: vlan not found\n", __func__); 310 return (ENOENT); /*NOTREACHED*/ 311 } 312 313 /* 314 * Grow the hash larger or smaller if memory permits. 315 */ 316 static void 317 vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 318 { 319 struct ifvlan *ifv; 320 struct ifvlanhead *hash2; 321 int hwidth2, i, j, n, n2; 322 323 TRUNK_LOCK_ASSERT(trunk); 324 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 325 326 if (howmuch == 0) { 327 /* Harmless yet obvious coding error */ 328 printf("%s: howmuch is 0\n", __func__); 329 return; 330 } 331 332 hwidth2 = trunk->hwidth + howmuch; 333 n = 1 << trunk->hwidth; 334 n2 = 1 << hwidth2; 335 /* Do not shrink the table below the default */ 336 if (hwidth2 < VLAN_DEF_HWIDTH) 337 return; 338 339 /* M_NOWAIT because we're called with trunk mutex held */ 340 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 341 if (hash2 == NULL) { 342 printf("%s: out of memory -- hash size not changed\n", 343 __func__); 344 return; /* We can live with the old hash table */ 345 } 346 for (j = 0; j < n2; j++) 347 LIST_INIT(&hash2[j]); 348 for (i = 0; i < n; i++) 349 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 350 LIST_REMOVE(ifv, ifv_list); 351 j = HASH(ifv->ifv_tag, n2 - 1); 352 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 353 } 354 free(trunk->hash, M_VLAN); 355 trunk->hash = hash2; 356 trunk->hwidth = hwidth2; 357 trunk->hmask = n2 - 1; 358 359 if (bootverbose) 360 if_printf(trunk->parent, 361 "VLAN hash table resized from %d to %d buckets\n", n, n2); 362 } 363 364 static __inline struct ifvlan * 365 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 366 { 367 struct ifvlan *ifv; 368 369 TRUNK_LOCK_RASSERT(trunk); 370 371 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 372 if (ifv->ifv_tag == tag) 373 return (ifv); 374 return (NULL); 375 } 376 377 #if 0 378 /* Debugging code to view the hashtables. */ 379 static void 380 vlan_dumphash(struct ifvlantrunk *trunk) 381 { 382 int i; 383 struct ifvlan *ifv; 384 385 for (i = 0; i < (1 << trunk->hwidth); i++) { 386 printf("%d: ", i); 387 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 388 printf("%s ", ifv->ifv_ifp->if_xname); 389 printf("\n"); 390 } 391 } 392 #endif /* 0 */ 393 #else 394 395 static __inline struct ifvlan * 396 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 397 { 398 399 return trunk->vlans[tag]; 400 } 401 402 static __inline int 403 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 404 { 405 406 if (trunk->vlans[ifv->ifv_tag] != NULL) 407 return EEXIST; 408 trunk->vlans[ifv->ifv_tag] = ifv; 409 trunk->refcnt++; 410 411 return (0); 412 } 413 414 static __inline int 415 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 416 { 417 418 trunk->vlans[ifv->ifv_tag] = NULL; 419 trunk->refcnt--; 420 421 return (0); 422 } 423 424 static __inline void 425 vlan_freehash(struct ifvlantrunk *trunk) 426 { 427 } 428 429 static __inline void 430 vlan_inithash(struct ifvlantrunk *trunk) 431 { 432 } 433 434 #endif /* !VLAN_ARRAY */ 435 436 static void 437 trunk_destroy(struct ifvlantrunk *trunk) 438 { 439 VLAN_LOCK_ASSERT(); 440 441 TRUNK_LOCK(trunk); 442 vlan_freehash(trunk); 443 trunk->parent->if_vlantrunk = NULL; 444 TRUNK_UNLOCK(trunk); 445 TRUNK_LOCK_DESTROY(trunk); 446 free(trunk, M_VLAN); 447 } 448 449 /* 450 * Program our multicast filter. What we're actually doing is 451 * programming the multicast filter of the parent. This has the 452 * side effect of causing the parent interface to receive multicast 453 * traffic that it doesn't really want, which ends up being discarded 454 * later by the upper protocol layers. Unfortunately, there's no way 455 * to avoid this: there really is only one physical interface. 456 * 457 * XXX: There is a possible race here if more than one thread is 458 * modifying the multicast state of the vlan interface at the same time. 459 */ 460 static int 461 vlan_setmulti(struct ifnet *ifp) 462 { 463 struct ifnet *ifp_p; 464 struct ifmultiaddr *ifma, *rifma = NULL; 465 struct ifvlan *sc; 466 struct vlan_mc_entry *mc; 467 int error; 468 469 /*VLAN_LOCK_ASSERT();*/ 470 471 /* Find the parent. */ 472 sc = ifp->if_softc; 473 ifp_p = PARENT(sc); 474 475 CURVNET_SET_QUIET(ifp_p->if_vnet); 476 477 /* First, remove any existing filter entries. */ 478 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 479 error = if_delmulti(ifp_p, (struct sockaddr *)&mc->mc_addr); 480 if (error) 481 return (error); 482 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 483 free(mc, M_VLAN); 484 } 485 486 /* Now program new ones. */ 487 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 488 if (ifma->ifma_addr->sa_family != AF_LINK) 489 continue; 490 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 491 if (mc == NULL) 492 return (ENOMEM); 493 bcopy(ifma->ifma_addr, &mc->mc_addr, ifma->ifma_addr->sa_len); 494 mc->mc_addr.sdl_index = ifp_p->if_index; 495 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 496 error = if_addmulti(ifp_p, (struct sockaddr *)&mc->mc_addr, 497 &rifma); 498 if (error) 499 return (error); 500 } 501 502 CURVNET_RESTORE(); 503 return (0); 504 } 505 506 /* 507 * A handler for parent interface link layer address changes. 508 * If the parent interface link layer address is changed we 509 * should also change it on all children vlans. 510 */ 511 static void 512 vlan_iflladdr(void *arg __unused, struct ifnet *ifp) 513 { 514 struct ifvlan *ifv; 515 #ifndef VLAN_ARRAY 516 struct ifvlan *next; 517 #endif 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 VLAN_LOCK(); 528 /* 529 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it. 530 */ 531 #ifdef VLAN_ARRAY 532 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 533 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 534 #else /* VLAN_ARRAY */ 535 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 536 LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) { 537 #endif /* VLAN_ARRAY */ 538 VLAN_UNLOCK(); 539 if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), 540 ifp->if_addrlen); 541 VLAN_LOCK(); 542 } 543 VLAN_UNLOCK(); 544 545 } 546 547 /* 548 * A handler for network interface departure events. 549 * Track departure of trunks here so that we don't access invalid 550 * pointers or whatever if a trunk is ripped from under us, e.g., 551 * by ejecting its hot-plug card. However, if an ifnet is simply 552 * being renamed, then there's no need to tear down the state. 553 */ 554 static void 555 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 556 { 557 struct ifvlan *ifv; 558 int i; 559 560 /* 561 * Check if it's a trunk interface first of all 562 * to avoid needless locking. 563 */ 564 if (ifp->if_vlantrunk == NULL) 565 return; 566 567 /* If the ifnet is just being renamed, don't do anything. */ 568 if (ifp->if_flags & IFF_RENAMING) 569 return; 570 571 VLAN_LOCK(); 572 /* 573 * OK, it's a trunk. Loop over and detach all vlan's on it. 574 * Check trunk pointer after each vlan_unconfig() as it will 575 * free it and set to NULL after the last vlan was detached. 576 */ 577 #ifdef VLAN_ARRAY 578 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 579 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 580 vlan_unconfig_locked(ifv->ifv_ifp); 581 if (ifp->if_vlantrunk == NULL) 582 break; 583 } 584 #else /* VLAN_ARRAY */ 585 restart: 586 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 587 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 588 vlan_unconfig_locked(ifv->ifv_ifp); 589 if (ifp->if_vlantrunk) 590 goto restart; /* trunk->hwidth can change */ 591 else 592 break; 593 } 594 #endif /* VLAN_ARRAY */ 595 /* Trunk should have been destroyed in vlan_unconfig(). */ 596 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 597 VLAN_UNLOCK(); 598 } 599 600 /* 601 * Return the trunk device for a virtual interface. 602 */ 603 static struct ifnet * 604 vlan_trunkdev(struct ifnet *ifp) 605 { 606 struct ifvlan *ifv; 607 608 if (ifp->if_type != IFT_L2VLAN) 609 return (NULL); 610 ifv = ifp->if_softc; 611 ifp = NULL; 612 VLAN_LOCK(); 613 if (ifv->ifv_trunk) 614 ifp = PARENT(ifv); 615 VLAN_UNLOCK(); 616 return (ifp); 617 } 618 619 /* 620 * Return the 16bit vlan tag for this interface. 621 */ 622 static int 623 vlan_tag(struct ifnet *ifp, uint16_t *tagp) 624 { 625 struct ifvlan *ifv; 626 627 if (ifp->if_type != IFT_L2VLAN) 628 return (EINVAL); 629 ifv = ifp->if_softc; 630 *tagp = ifv->ifv_tag; 631 return (0); 632 } 633 634 /* 635 * Return a driver specific cookie for this interface. Synchronization 636 * with setcookie must be provided by the driver. 637 */ 638 static void * 639 vlan_cookie(struct ifnet *ifp) 640 { 641 struct ifvlan *ifv; 642 643 if (ifp->if_type != IFT_L2VLAN) 644 return (NULL); 645 ifv = ifp->if_softc; 646 return (ifv->ifv_cookie); 647 } 648 649 /* 650 * Store a cookie in our softc that drivers can use to store driver 651 * private per-instance data in. 652 */ 653 static int 654 vlan_setcookie(struct ifnet *ifp, void *cookie) 655 { 656 struct ifvlan *ifv; 657 658 if (ifp->if_type != IFT_L2VLAN) 659 return (EINVAL); 660 ifv = ifp->if_softc; 661 ifv->ifv_cookie = cookie; 662 return (0); 663 } 664 665 /* 666 * Return the vlan device present at the specific tag. 667 */ 668 static struct ifnet * 669 vlan_devat(struct ifnet *ifp, uint16_t tag) 670 { 671 struct ifvlantrunk *trunk; 672 struct ifvlan *ifv; 673 674 trunk = ifp->if_vlantrunk; 675 if (trunk == NULL) 676 return (NULL); 677 ifp = NULL; 678 TRUNK_RLOCK(trunk); 679 ifv = vlan_gethash(trunk, tag); 680 if (ifv) 681 ifp = ifv->ifv_ifp; 682 TRUNK_RUNLOCK(trunk); 683 return (ifp); 684 } 685 686 /* 687 * VLAN support can be loaded as a module. The only place in the 688 * system that's intimately aware of this is ether_input. We hook 689 * into this code through vlan_input_p which is defined there and 690 * set here. Noone else in the system should be aware of this so 691 * we use an explicit reference here. 692 */ 693 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 694 695 /* For if_link_state_change() eyes only... */ 696 extern void (*vlan_link_state_p)(struct ifnet *); 697 698 static int 699 vlan_modevent(module_t mod, int type, void *data) 700 { 701 702 switch (type) { 703 case MOD_LOAD: 704 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 705 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 706 if (ifdetach_tag == NULL) 707 return (ENOMEM); 708 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 709 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 710 if (iflladdr_tag == NULL) 711 return (ENOMEM); 712 VLAN_LOCK_INIT(); 713 vlan_input_p = vlan_input; 714 vlan_link_state_p = vlan_link_state; 715 vlan_trunk_cap_p = vlan_trunk_capabilities; 716 vlan_trunkdev_p = vlan_trunkdev; 717 vlan_cookie_p = vlan_cookie; 718 vlan_setcookie_p = vlan_setcookie; 719 vlan_tag_p = vlan_tag; 720 vlan_devat_p = vlan_devat; 721 #ifndef VIMAGE 722 if_clone_attach(&vlan_cloner); 723 #endif 724 if (bootverbose) 725 printf("vlan: initialized, using " 726 #ifdef VLAN_ARRAY 727 "full-size arrays" 728 #else 729 "hash tables with chaining" 730 #endif 731 732 "\n"); 733 break; 734 case MOD_UNLOAD: 735 #ifndef VIMAGE 736 if_clone_detach(&vlan_cloner); 737 #endif 738 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 739 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag); 740 vlan_input_p = NULL; 741 vlan_link_state_p = NULL; 742 vlan_trunk_cap_p = NULL; 743 vlan_trunkdev_p = NULL; 744 vlan_tag_p = NULL; 745 vlan_cookie_p = vlan_cookie; 746 vlan_setcookie_p = vlan_setcookie; 747 vlan_devat_p = NULL; 748 VLAN_LOCK_DESTROY(); 749 if (bootverbose) 750 printf("vlan: unloaded\n"); 751 break; 752 default: 753 return (EOPNOTSUPP); 754 } 755 return (0); 756 } 757 758 static moduledata_t vlan_mod = { 759 "if_vlan", 760 vlan_modevent, 761 0 762 }; 763 764 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 765 MODULE_VERSION(if_vlan, 3); 766 767 #ifdef VIMAGE 768 static void 769 vnet_vlan_init(const void *unused __unused) 770 { 771 772 V_vlan_cloner = vlan_cloner; 773 if_clone_attach(&V_vlan_cloner); 774 } 775 VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 776 vnet_vlan_init, NULL); 777 778 static void 779 vnet_vlan_uninit(const void *unused __unused) 780 { 781 782 if_clone_detach(&V_vlan_cloner); 783 } 784 VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 785 vnet_vlan_uninit, NULL); 786 #endif 787 788 static struct ifnet * 789 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 790 { 791 const char *cp; 792 struct ifnet *ifp; 793 int t; 794 795 /* Check for <etherif>.<vlan> style interface names. */ 796 IFNET_RLOCK_NOSLEEP(); 797 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 798 /* 799 * We can handle non-ethernet hardware types as long as 800 * they handle the tagging and headers themselves. 801 */ 802 if (ifp->if_type != IFT_ETHER && 803 (ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) 804 continue; 805 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 806 continue; 807 cp = name + strlen(ifp->if_xname); 808 if (*cp++ != '.') 809 continue; 810 if (*cp == '\0') 811 continue; 812 t = 0; 813 for(; *cp >= '0' && *cp <= '9'; cp++) 814 t = (t * 10) + (*cp - '0'); 815 if (*cp != '\0') 816 continue; 817 if (tag != NULL) 818 *tag = t; 819 break; 820 } 821 IFNET_RUNLOCK_NOSLEEP(); 822 823 return (ifp); 824 } 825 826 static int 827 vlan_clone_match(struct if_clone *ifc, const char *name) 828 { 829 const char *cp; 830 831 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 832 return (1); 833 834 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 835 return (0); 836 for (cp = name + 4; *cp != '\0'; cp++) { 837 if (*cp < '0' || *cp > '9') 838 return (0); 839 } 840 841 return (1); 842 } 843 844 static int 845 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 846 { 847 char *dp; 848 int wildcard; 849 int unit; 850 int error; 851 int tag; 852 int ethertag; 853 struct ifvlan *ifv; 854 struct ifnet *ifp; 855 struct ifnet *p; 856 struct ifaddr *ifa; 857 struct sockaddr_dl *sdl; 858 struct vlanreq vlr; 859 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 860 861 /* 862 * There are 3 (ugh) ways to specify the cloned device: 863 * o pass a parameter block with the clone request. 864 * o specify parameters in the text of the clone device name 865 * o specify no parameters and get an unattached device that 866 * must be configured separately. 867 * The first technique is preferred; the latter two are 868 * supported for backwards compatibilty. 869 */ 870 if (params) { 871 error = copyin(params, &vlr, sizeof(vlr)); 872 if (error) 873 return error; 874 p = ifunit(vlr.vlr_parent); 875 if (p == NULL) 876 return ENXIO; 877 /* 878 * Don't let the caller set up a VLAN tag with 879 * anything except VLID bits. 880 */ 881 if (vlr.vlr_tag & ~EVL_VLID_MASK) 882 return (EINVAL); 883 error = ifc_name2unit(name, &unit); 884 if (error != 0) 885 return (error); 886 887 ethertag = 1; 888 tag = vlr.vlr_tag; 889 wildcard = (unit < 0); 890 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 891 ethertag = 1; 892 unit = -1; 893 wildcard = 0; 894 895 /* 896 * Don't let the caller set up a VLAN tag with 897 * anything except VLID bits. 898 */ 899 if (tag & ~EVL_VLID_MASK) 900 return (EINVAL); 901 } else { 902 ethertag = 0; 903 904 error = ifc_name2unit(name, &unit); 905 if (error != 0) 906 return (error); 907 908 wildcard = (unit < 0); 909 } 910 911 error = ifc_alloc_unit(ifc, &unit); 912 if (error != 0) 913 return (error); 914 915 /* In the wildcard case, we need to update the name. */ 916 if (wildcard) { 917 for (dp = name; *dp != '\0'; dp++); 918 if (snprintf(dp, len - (dp-name), "%d", unit) > 919 len - (dp-name) - 1) { 920 panic("%s: interface name too long", __func__); 921 } 922 } 923 924 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 925 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 926 if (ifp == NULL) { 927 ifc_free_unit(ifc, unit); 928 free(ifv, M_VLAN); 929 return (ENOSPC); 930 } 931 SLIST_INIT(&ifv->vlan_mc_listhead); 932 933 ifp->if_softc = ifv; 934 /* 935 * Set the name manually rather than using if_initname because 936 * we don't conform to the default naming convention for interfaces. 937 */ 938 strlcpy(ifp->if_xname, name, IFNAMSIZ); 939 ifp->if_dname = ifc->ifc_name; 940 ifp->if_dunit = unit; 941 /* NB: flags are not set here */ 942 ifp->if_linkmib = &ifv->ifv_mib; 943 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 944 /* NB: mtu is not set here */ 945 946 ifp->if_init = vlan_init; 947 ifp->if_start = vlan_start; 948 ifp->if_ioctl = vlan_ioctl; 949 ifp->if_snd.ifq_maxlen = ifqmaxlen; 950 ifp->if_flags = VLAN_IFFLAGS; 951 ether_ifattach(ifp, eaddr); 952 /* Now undo some of the damage... */ 953 ifp->if_baudrate = 0; 954 ifp->if_type = IFT_L2VLAN; 955 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 956 ifa = ifp->if_addr; 957 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 958 sdl->sdl_type = IFT_L2VLAN; 959 960 if (ethertag) { 961 error = vlan_config(ifv, p, tag); 962 if (error != 0) { 963 /* 964 * Since we've partialy failed, we need to back 965 * out all the way, otherwise userland could get 966 * confused. Thus, we destroy the interface. 967 */ 968 ether_ifdetach(ifp); 969 vlan_unconfig(ifp); 970 if_free(ifp); 971 ifc_free_unit(ifc, unit); 972 free(ifv, M_VLAN); 973 974 return (error); 975 } 976 977 /* Update flags on the parent, if necessary. */ 978 vlan_setflags(ifp, 1); 979 } 980 981 return (0); 982 } 983 984 static int 985 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 986 { 987 struct ifvlan *ifv = ifp->if_softc; 988 int unit = ifp->if_dunit; 989 990 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 991 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 992 if_free(ifp); 993 free(ifv, M_VLAN); 994 ifc_free_unit(ifc, unit); 995 996 return (0); 997 } 998 999 /* 1000 * The ifp->if_init entry point for vlan(4) is a no-op. 1001 */ 1002 static void 1003 vlan_init(void *foo __unused) 1004 { 1005 } 1006 1007 /* 1008 * The if_start method for vlan(4) interface. It doesn't 1009 * raises the IFF_DRV_OACTIVE flag, since it is called 1010 * only from IFQ_HANDOFF() macro in ether_output_frame(). 1011 * If the interface queue is full, and vlan_start() is 1012 * not called, the queue would never get emptied and 1013 * interface would stall forever. 1014 */ 1015 static void 1016 vlan_start(struct ifnet *ifp) 1017 { 1018 struct ifvlan *ifv; 1019 struct ifnet *p; 1020 struct mbuf *m; 1021 int error; 1022 1023 ifv = ifp->if_softc; 1024 p = PARENT(ifv); 1025 1026 for (;;) { 1027 IF_DEQUEUE(&ifp->if_snd, m); 1028 if (m == NULL) 1029 break; 1030 BPF_MTAP(ifp, m); 1031 1032 /* 1033 * Do not run parent's if_start() if the parent is not up, 1034 * or parent's driver will cause a system crash. 1035 */ 1036 if (!UP_AND_RUNNING(p)) { 1037 m_freem(m); 1038 ifp->if_collisions++; 1039 continue; 1040 } 1041 1042 /* 1043 * Pad the frame to the minimum size allowed if told to. 1044 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 1045 * paragraph C.4.4.3.b. It can help to work around buggy 1046 * bridges that violate paragraph C.4.4.3.a from the same 1047 * document, i.e., fail to pad short frames after untagging. 1048 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 1049 * untagging it will produce a 62-byte frame, which is a runt 1050 * and requires padding. There are VLAN-enabled network 1051 * devices that just discard such runts instead or mishandle 1052 * them somehow. 1053 */ 1054 if (soft_pad && p->if_type == IFT_ETHER) { 1055 static char pad[8]; /* just zeros */ 1056 int n; 1057 1058 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 1059 n > 0; n -= sizeof(pad)) 1060 if (!m_append(m, min(n, sizeof(pad)), pad)) 1061 break; 1062 1063 if (n > 0) { 1064 if_printf(ifp, "cannot pad short frame\n"); 1065 ifp->if_oerrors++; 1066 m_freem(m); 1067 continue; 1068 } 1069 } 1070 1071 /* 1072 * If underlying interface can do VLAN tag insertion itself, 1073 * just pass the packet along. However, we need some way to 1074 * tell the interface where the packet came from so that it 1075 * knows how to find the VLAN tag to use, so we attach a 1076 * packet tag that holds it. 1077 */ 1078 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1079 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 1080 m->m_flags |= M_VLANTAG; 1081 } else { 1082 m = ether_vlanencap(m, ifv->ifv_tag); 1083 if (m == NULL) { 1084 if_printf(ifp, 1085 "unable to prepend VLAN header\n"); 1086 ifp->if_oerrors++; 1087 continue; 1088 } 1089 } 1090 1091 /* 1092 * Send it, precisely as ether_output() would have. 1093 * We are already running at splimp. 1094 */ 1095 error = (p->if_transmit)(p, m); 1096 if (!error) 1097 ifp->if_opackets++; 1098 else 1099 ifp->if_oerrors++; 1100 } 1101 } 1102 1103 static void 1104 vlan_input(struct ifnet *ifp, struct mbuf *m) 1105 { 1106 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1107 struct ifvlan *ifv; 1108 uint16_t tag; 1109 1110 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 1111 1112 if (m->m_flags & M_VLANTAG) { 1113 /* 1114 * Packet is tagged, but m contains a normal 1115 * Ethernet frame; the tag is stored out-of-band. 1116 */ 1117 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 1118 m->m_flags &= ~M_VLANTAG; 1119 } else { 1120 struct ether_vlan_header *evl; 1121 1122 /* 1123 * Packet is tagged in-band as specified by 802.1q. 1124 */ 1125 switch (ifp->if_type) { 1126 case IFT_ETHER: 1127 if (m->m_len < sizeof(*evl) && 1128 (m = m_pullup(m, sizeof(*evl))) == NULL) { 1129 if_printf(ifp, "cannot pullup VLAN header\n"); 1130 return; 1131 } 1132 evl = mtod(m, struct ether_vlan_header *); 1133 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 1134 1135 /* 1136 * Remove the 802.1q header by copying the Ethernet 1137 * addresses over it and adjusting the beginning of 1138 * the data in the mbuf. The encapsulated Ethernet 1139 * type field is already in place. 1140 */ 1141 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 1142 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1143 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1144 break; 1145 1146 default: 1147 #ifdef INVARIANTS 1148 panic("%s: %s has unsupported if_type %u", 1149 __func__, ifp->if_xname, ifp->if_type); 1150 #endif 1151 m_freem(m); 1152 ifp->if_noproto++; 1153 return; 1154 } 1155 } 1156 1157 TRUNK_RLOCK(trunk); 1158 ifv = vlan_gethash(trunk, tag); 1159 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 1160 TRUNK_RUNLOCK(trunk); 1161 m_freem(m); 1162 ifp->if_noproto++; 1163 return; 1164 } 1165 TRUNK_RUNLOCK(trunk); 1166 1167 m->m_pkthdr.rcvif = ifv->ifv_ifp; 1168 ifv->ifv_ifp->if_ipackets++; 1169 1170 /* Pass it back through the parent's input routine. */ 1171 (*ifp->if_input)(ifv->ifv_ifp, m); 1172 } 1173 1174 static int 1175 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 1176 { 1177 struct ifvlantrunk *trunk; 1178 struct ifnet *ifp; 1179 int error = 0; 1180 1181 /* VID numbers 0x0 and 0xFFF are reserved */ 1182 if (tag == 0 || tag == 0xFFF) 1183 return (EINVAL); 1184 if (p->if_type != IFT_ETHER && 1185 (p->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) 1186 return (EPROTONOSUPPORT); 1187 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1188 return (EPROTONOSUPPORT); 1189 if (ifv->ifv_trunk) 1190 return (EBUSY); 1191 1192 if (p->if_vlantrunk == NULL) { 1193 trunk = malloc(sizeof(struct ifvlantrunk), 1194 M_VLAN, M_WAITOK | M_ZERO); 1195 vlan_inithash(trunk); 1196 VLAN_LOCK(); 1197 if (p->if_vlantrunk != NULL) { 1198 /* A race that that is very unlikely to be hit. */ 1199 vlan_freehash(trunk); 1200 free(trunk, M_VLAN); 1201 goto exists; 1202 } 1203 TRUNK_LOCK_INIT(trunk); 1204 TRUNK_LOCK(trunk); 1205 p->if_vlantrunk = trunk; 1206 trunk->parent = p; 1207 } else { 1208 VLAN_LOCK(); 1209 exists: 1210 trunk = p->if_vlantrunk; 1211 TRUNK_LOCK(trunk); 1212 } 1213 1214 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1215 error = vlan_inshash(trunk, ifv); 1216 if (error) 1217 goto done; 1218 ifv->ifv_proto = ETHERTYPE_VLAN; 1219 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1220 ifv->ifv_mintu = ETHERMIN; 1221 ifv->ifv_pflags = 0; 1222 1223 /* 1224 * If the parent supports the VLAN_MTU capability, 1225 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1226 * use it. 1227 */ 1228 if (p->if_capenable & IFCAP_VLAN_MTU) { 1229 /* 1230 * No need to fudge the MTU since the parent can 1231 * handle extended frames. 1232 */ 1233 ifv->ifv_mtufudge = 0; 1234 } else { 1235 /* 1236 * Fudge the MTU by the encapsulation size. This 1237 * makes us incompatible with strictly compliant 1238 * 802.1Q implementations, but allows us to use 1239 * the feature with other NetBSD implementations, 1240 * which might still be useful. 1241 */ 1242 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1243 } 1244 1245 ifv->ifv_trunk = trunk; 1246 ifp = ifv->ifv_ifp; 1247 /* 1248 * Initialize fields from our parent. This duplicates some 1249 * work with ether_ifattach() but allows for non-ethernet 1250 * interfaces to also work. 1251 */ 1252 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1253 ifp->if_baudrate = p->if_baudrate; 1254 ifp->if_output = p->if_output; 1255 ifp->if_input = p->if_input; 1256 ifp->if_resolvemulti = p->if_resolvemulti; 1257 ifp->if_addrlen = p->if_addrlen; 1258 ifp->if_broadcastaddr = p->if_broadcastaddr; 1259 1260 /* 1261 * Copy only a selected subset of flags from the parent. 1262 * Other flags are none of our business. 1263 */ 1264 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1265 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1266 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1267 #undef VLAN_COPY_FLAGS 1268 1269 ifp->if_link_state = p->if_link_state; 1270 1271 vlan_capabilities(ifv); 1272 1273 /* 1274 * Set up our interface address to reflect the underlying 1275 * physical interface's. 1276 */ 1277 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen); 1278 ((struct sockaddr_dl *)ifp->if_addr->ifa_addr)->sdl_alen = 1279 p->if_addrlen; 1280 1281 /* 1282 * Configure multicast addresses that may already be 1283 * joined on the vlan device. 1284 */ 1285 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1286 1287 /* We are ready for operation now. */ 1288 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1289 done: 1290 TRUNK_UNLOCK(trunk); 1291 if (error == 0) 1292 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1293 VLAN_UNLOCK(); 1294 1295 return (error); 1296 } 1297 1298 static void 1299 vlan_unconfig(struct ifnet *ifp) 1300 { 1301 1302 VLAN_LOCK(); 1303 vlan_unconfig_locked(ifp); 1304 VLAN_UNLOCK(); 1305 } 1306 1307 static void 1308 vlan_unconfig_locked(struct ifnet *ifp) 1309 { 1310 struct ifvlantrunk *trunk; 1311 struct vlan_mc_entry *mc; 1312 struct ifvlan *ifv; 1313 struct ifnet *parent; 1314 1315 VLAN_LOCK_ASSERT(); 1316 1317 ifv = ifp->if_softc; 1318 trunk = ifv->ifv_trunk; 1319 parent = NULL; 1320 1321 if (trunk != NULL) { 1322 1323 TRUNK_LOCK(trunk); 1324 parent = trunk->parent; 1325 1326 /* 1327 * Since the interface is being unconfigured, we need to 1328 * empty the list of multicast groups that we may have joined 1329 * while we were alive from the parent's list. 1330 */ 1331 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1332 /* 1333 * This may fail if the parent interface is 1334 * being detached. Regardless, we should do a 1335 * best effort to free this interface as much 1336 * as possible as all callers expect vlan 1337 * destruction to succeed. 1338 */ 1339 (void)if_delmulti(parent, 1340 (struct sockaddr *)&mc->mc_addr); 1341 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1342 free(mc, M_VLAN); 1343 } 1344 1345 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1346 vlan_remhash(trunk, ifv); 1347 ifv->ifv_trunk = NULL; 1348 1349 /* 1350 * Check if we were the last. 1351 */ 1352 if (trunk->refcnt == 0) { 1353 trunk->parent->if_vlantrunk = NULL; 1354 /* 1355 * XXXGL: If some ithread has already entered 1356 * vlan_input() and is now blocked on the trunk 1357 * lock, then it should preempt us right after 1358 * unlock and finish its work. Then we will acquire 1359 * lock again in trunk_destroy(). 1360 */ 1361 TRUNK_UNLOCK(trunk); 1362 trunk_destroy(trunk); 1363 } else 1364 TRUNK_UNLOCK(trunk); 1365 } 1366 1367 /* Disconnect from parent. */ 1368 if (ifv->ifv_pflags) 1369 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1370 ifp->if_mtu = ETHERMTU; 1371 ifp->if_link_state = LINK_STATE_UNKNOWN; 1372 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1373 1374 /* 1375 * Only dispatch an event if vlan was 1376 * attached, otherwise there is nothing 1377 * to cleanup anyway. 1378 */ 1379 if (parent != NULL) 1380 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1381 } 1382 1383 /* Handle a reference counted flag that should be set on the parent as well */ 1384 static int 1385 vlan_setflag(struct ifnet *ifp, int flag, int status, 1386 int (*func)(struct ifnet *, int)) 1387 { 1388 struct ifvlan *ifv; 1389 int error; 1390 1391 /* XXX VLAN_LOCK_ASSERT(); */ 1392 1393 ifv = ifp->if_softc; 1394 status = status ? (ifp->if_flags & flag) : 0; 1395 /* Now "status" contains the flag value or 0 */ 1396 1397 /* 1398 * See if recorded parent's status is different from what 1399 * we want it to be. If it is, flip it. We record parent's 1400 * status in ifv_pflags so that we won't clear parent's flag 1401 * we haven't set. In fact, we don't clear or set parent's 1402 * flags directly, but get or release references to them. 1403 * That's why we can be sure that recorded flags still are 1404 * in accord with actual parent's flags. 1405 */ 1406 if (status != (ifv->ifv_pflags & flag)) { 1407 error = (*func)(PARENT(ifv), status); 1408 if (error) 1409 return (error); 1410 ifv->ifv_pflags &= ~flag; 1411 ifv->ifv_pflags |= status; 1412 } 1413 return (0); 1414 } 1415 1416 /* 1417 * Handle IFF_* flags that require certain changes on the parent: 1418 * if "status" is true, update parent's flags respective to our if_flags; 1419 * if "status" is false, forcedly clear the flags set on parent. 1420 */ 1421 static int 1422 vlan_setflags(struct ifnet *ifp, int status) 1423 { 1424 int error, i; 1425 1426 for (i = 0; vlan_pflags[i].flag; i++) { 1427 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1428 status, vlan_pflags[i].func); 1429 if (error) 1430 return (error); 1431 } 1432 return (0); 1433 } 1434 1435 /* Inform all vlans that their parent has changed link state */ 1436 static void 1437 vlan_link_state(struct ifnet *ifp) 1438 { 1439 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1440 struct ifvlan *ifv; 1441 int i; 1442 1443 TRUNK_LOCK(trunk); 1444 #ifdef VLAN_ARRAY 1445 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1446 if (trunk->vlans[i] != NULL) { 1447 ifv = trunk->vlans[i]; 1448 #else 1449 for (i = 0; i < (1 << trunk->hwidth); i++) 1450 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1451 #endif 1452 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1453 if_link_state_change(ifv->ifv_ifp, 1454 trunk->parent->if_link_state); 1455 } 1456 TRUNK_UNLOCK(trunk); 1457 } 1458 1459 static void 1460 vlan_capabilities(struct ifvlan *ifv) 1461 { 1462 struct ifnet *p = PARENT(ifv); 1463 struct ifnet *ifp = ifv->ifv_ifp; 1464 1465 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1466 1467 /* 1468 * If the parent interface can do checksum offloading 1469 * on VLANs, then propagate its hardware-assisted 1470 * checksumming flags. Also assert that checksum 1471 * offloading requires hardware VLAN tagging. 1472 */ 1473 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1474 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1475 1476 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1477 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1478 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1479 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1480 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1481 } else { 1482 ifp->if_capenable = 0; 1483 ifp->if_hwassist = 0; 1484 } 1485 /* 1486 * If the parent interface can do TSO on VLANs then 1487 * propagate the hardware-assisted flag. TSO on VLANs 1488 * does not necessarily require hardware VLAN tagging. 1489 */ 1490 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1491 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1492 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1493 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1494 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1495 } else { 1496 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1497 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1498 } 1499 } 1500 1501 static void 1502 vlan_trunk_capabilities(struct ifnet *ifp) 1503 { 1504 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1505 struct ifvlan *ifv; 1506 int i; 1507 1508 TRUNK_LOCK(trunk); 1509 #ifdef VLAN_ARRAY 1510 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1511 if (trunk->vlans[i] != NULL) { 1512 ifv = trunk->vlans[i]; 1513 #else 1514 for (i = 0; i < (1 << trunk->hwidth); i++) { 1515 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1516 #endif 1517 vlan_capabilities(ifv); 1518 } 1519 TRUNK_UNLOCK(trunk); 1520 } 1521 1522 static int 1523 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1524 { 1525 struct ifnet *p; 1526 struct ifreq *ifr; 1527 struct ifaddr *ifa; 1528 struct ifvlan *ifv; 1529 struct vlanreq vlr; 1530 int error = 0; 1531 1532 ifr = (struct ifreq *)data; 1533 ifa = (struct ifaddr *) data; 1534 ifv = ifp->if_softc; 1535 1536 switch (cmd) { 1537 case SIOCSIFADDR: 1538 ifp->if_flags |= IFF_UP; 1539 #ifdef INET 1540 if (ifa->ifa_addr->sa_family == AF_INET) 1541 arp_ifinit(ifp, ifa); 1542 #endif 1543 break; 1544 case SIOCGIFADDR: 1545 { 1546 struct sockaddr *sa; 1547 1548 sa = (struct sockaddr *)&ifr->ifr_data; 1549 bcopy(IF_LLADDR(ifp), sa->sa_data, ifp->if_addrlen); 1550 } 1551 break; 1552 case SIOCGIFMEDIA: 1553 VLAN_LOCK(); 1554 if (TRUNK(ifv) != NULL) { 1555 p = PARENT(ifv); 1556 VLAN_UNLOCK(); 1557 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data); 1558 /* Limit the result to the parent's current config. */ 1559 if (error == 0) { 1560 struct ifmediareq *ifmr; 1561 1562 ifmr = (struct ifmediareq *)data; 1563 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1564 ifmr->ifm_count = 1; 1565 error = copyout(&ifmr->ifm_current, 1566 ifmr->ifm_ulist, 1567 sizeof(int)); 1568 } 1569 } 1570 } else { 1571 VLAN_UNLOCK(); 1572 error = EINVAL; 1573 } 1574 break; 1575 1576 case SIOCSIFMEDIA: 1577 error = EINVAL; 1578 break; 1579 1580 case SIOCSIFMTU: 1581 /* 1582 * Set the interface MTU. 1583 */ 1584 VLAN_LOCK(); 1585 if (TRUNK(ifv) != NULL) { 1586 if (ifr->ifr_mtu > 1587 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1588 ifr->ifr_mtu < 1589 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1590 error = EINVAL; 1591 else 1592 ifp->if_mtu = ifr->ifr_mtu; 1593 } else 1594 error = EINVAL; 1595 VLAN_UNLOCK(); 1596 break; 1597 1598 case SIOCSETVLAN: 1599 #ifdef VIMAGE 1600 if (ifp->if_vnet != ifp->if_home_vnet) { 1601 error = EPERM; 1602 break; 1603 } 1604 #endif 1605 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1606 if (error) 1607 break; 1608 if (vlr.vlr_parent[0] == '\0') { 1609 vlan_unconfig(ifp); 1610 break; 1611 } 1612 p = ifunit(vlr.vlr_parent); 1613 if (p == NULL) { 1614 error = ENOENT; 1615 break; 1616 } 1617 /* 1618 * Don't let the caller set up a VLAN tag with 1619 * anything except VLID bits. 1620 */ 1621 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1622 error = EINVAL; 1623 break; 1624 } 1625 error = vlan_config(ifv, p, vlr.vlr_tag); 1626 if (error) 1627 break; 1628 1629 /* Update flags on the parent, if necessary. */ 1630 vlan_setflags(ifp, 1); 1631 break; 1632 1633 case SIOCGETVLAN: 1634 #ifdef VIMAGE 1635 if (ifp->if_vnet != ifp->if_home_vnet) { 1636 error = EPERM; 1637 break; 1638 } 1639 #endif 1640 bzero(&vlr, sizeof(vlr)); 1641 VLAN_LOCK(); 1642 if (TRUNK(ifv) != NULL) { 1643 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1644 sizeof(vlr.vlr_parent)); 1645 vlr.vlr_tag = ifv->ifv_tag; 1646 } 1647 VLAN_UNLOCK(); 1648 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1649 break; 1650 1651 case SIOCSIFFLAGS: 1652 /* 1653 * We should propagate selected flags to the parent, 1654 * e.g., promiscuous mode. 1655 */ 1656 if (TRUNK(ifv) != NULL) 1657 error = vlan_setflags(ifp, 1); 1658 break; 1659 1660 case SIOCADDMULTI: 1661 case SIOCDELMULTI: 1662 /* 1663 * If we don't have a parent, just remember the membership for 1664 * when we do. 1665 */ 1666 if (TRUNK(ifv) != NULL) 1667 error = vlan_setmulti(ifp); 1668 break; 1669 1670 default: 1671 error = EINVAL; 1672 break; 1673 } 1674 1675 return (error); 1676 } 1677