1 /*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. 34 * Might be extended some day to also handle IEEE 802.1p priority 35 * tagging. This is sort of sneaky in the implementation, since 36 * we need to pretend to be enough of an Ethernet implementation 37 * to make arp work. The way we do this is by telling everyone 38 * that we are an Ethernet, and then catch the packets that 39 * ether_output() left on our output queue when it calls 40 * if_start(), rewrite them for use by the real outgoing interface, 41 * and ask it to send them. 42 */ 43 44 #include "opt_inet.h" 45 #include "opt_vlan.h" 46 47 #include <sys/param.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/module.h> 53 #include <sys/rwlock.h> 54 #include <sys/queue.h> 55 #include <sys/socket.h> 56 #include <sys/sockio.h> 57 #include <sys/sysctl.h> 58 #include <sys/systm.h> 59 60 #include <net/bpf.h> 61 #include <net/ethernet.h> 62 #include <net/if.h> 63 #include <net/if_clone.h> 64 #include <net/if_arp.h> 65 #include <net/if_dl.h> 66 #include <net/if_types.h> 67 #include <net/if_vlan_var.h> 68 69 #ifdef INET 70 #include <netinet/in.h> 71 #include <netinet/if_ether.h> 72 #endif 73 74 #define VLANNAME "vlan" 75 #define VLAN_DEF_HWIDTH 4 76 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 77 78 LIST_HEAD(ifvlanhead, ifvlan); 79 80 struct ifvlantrunk { 81 struct ifnet *parent; /* parent interface of this trunk */ 82 struct rwlock rw; 83 #ifdef VLAN_ARRAY 84 struct ifvlan *vlans[EVL_VLID_MASK+1]; /* 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 LIST_ENTRY(ifvlantrunk) trunk_entry; 92 }; 93 static LIST_HEAD(, ifvlantrunk) trunk_list; 94 95 struct vlan_mc_entry { 96 struct ether_addr mc_addr; 97 SLIST_ENTRY(vlan_mc_entry) mc_entries; 98 }; 99 100 struct ifvlan { 101 struct ifvlantrunk *ifv_trunk; 102 struct ifnet *ifv_ifp; 103 #define TRUNK(ifv) ((ifv)->ifv_trunk) 104 #define PARENT(ifv) ((ifv)->ifv_trunk->parent) 105 int ifv_pflags; /* special flags we have set on parent */ 106 struct ifv_linkmib { 107 int ifvm_parent; 108 int ifvm_encaplen; /* encapsulation length */ 109 int ifvm_mtufudge; /* MTU fudged by this much */ 110 int ifvm_mintu; /* min transmission unit */ 111 uint16_t ifvm_proto; /* encapsulation ethertype */ 112 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 113 } ifv_mib; 114 SLIST_HEAD(__vlan_mchead, vlan_mc_entry) vlan_mc_listhead; 115 LIST_ENTRY(ifvlan) ifv_list; 116 }; 117 #define ifv_tag ifv_mib.ifvm_tag 118 #define ifv_encaplen ifv_mib.ifvm_encaplen 119 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 120 #define ifv_mintu ifv_mib.ifvm_mintu 121 122 /* Special flags we should propagate to parent. */ 123 static struct { 124 int flag; 125 int (*func)(struct ifnet *, int); 126 } vlan_pflags[] = { 127 {IFF_PROMISC, ifpromisc}, 128 {IFF_ALLMULTI, if_allmulti}, 129 {0, NULL} 130 }; 131 132 SYSCTL_DECL(_net_link); 133 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 134 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 135 136 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 137 138 /* 139 * We have a global mutex, that is used to serialize configuration 140 * changes and isn't used in normal packet delivery. 141 * 142 * We also have a per-trunk rwlock, that is locked shared on packet 143 * processing and exclusive when configuration is changed. 144 * 145 * The VLAN_ARRAY substitutes the dynamic hash with a static array 146 * with 4096 entries. In theory this can give a boots in processing, 147 * however on practice it does not. Probably this is because array 148 * is too big to fit into CPU cache. 149 */ 150 static struct mtx ifv_mtx; 151 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 152 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 153 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 154 #define VLAN_LOCK() mtx_lock(&ifv_mtx) 155 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 156 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 157 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 158 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 159 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 160 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 161 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 162 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 163 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 164 165 #ifndef VLAN_ARRAY 166 static void vlan_inithash(struct ifvlantrunk *trunk); 167 static void vlan_freehash(struct ifvlantrunk *trunk); 168 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 169 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 170 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 171 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 172 uint16_t tag); 173 #endif 174 static void trunk_destroy(struct ifvlantrunk *trunk); 175 176 static void vlan_start(struct ifnet *ifp); 177 static void vlan_ifinit(void *foo); 178 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 179 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 180 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 181 int (*func)(struct ifnet *, int)); 182 static int vlan_setflags(struct ifnet *ifp, int status); 183 static int vlan_setmulti(struct ifnet *ifp); 184 static int vlan_unconfig(struct ifnet *ifp); 185 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 186 static void vlan_link_state(struct ifnet *ifp, int link); 187 static void vlan_capabilities(struct ifvlan *ifv); 188 static void vlan_trunk_capabilities(struct ifnet *ifp); 189 190 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 191 const char *, int *); 192 static int vlan_clone_match(struct if_clone *, const char *); 193 static int vlan_clone_create(struct if_clone *, char *, size_t); 194 static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 195 196 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 197 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 198 199 #ifndef VLAN_ARRAY 200 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 201 static void 202 vlan_inithash(struct ifvlantrunk *trunk) 203 { 204 int i, n; 205 206 /* 207 * The trunk must not be locked here since we call malloc(M_WAITOK). 208 * It is OK in case this function is called before the trunk struct 209 * gets hooked up and becomes visible from other threads. 210 */ 211 212 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 213 ("%s: hash already initialized", __func__)); 214 215 trunk->hwidth = VLAN_DEF_HWIDTH; 216 n = 1 << trunk->hwidth; 217 trunk->hmask = n - 1; 218 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 219 for (i = 0; i < n; i++) 220 LIST_INIT(&trunk->hash[i]); 221 } 222 223 static void 224 vlan_freehash(struct ifvlantrunk *trunk) 225 { 226 #ifdef INVARIANTS 227 int i; 228 229 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 230 for (i = 0; i < (1 << trunk->hwidth); i++) 231 KASSERT(LIST_EMPTY(&trunk->hash[i]), 232 ("%s: hash table not empty", __func__)); 233 #endif 234 free(trunk->hash, M_VLAN); 235 trunk->hash = NULL; 236 trunk->hwidth = trunk->hmask = 0; 237 } 238 239 static int 240 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 241 { 242 int i, b; 243 struct ifvlan *ifv2; 244 245 TRUNK_LOCK_ASSERT(trunk); 246 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 247 248 b = 1 << trunk->hwidth; 249 i = HASH(ifv->ifv_tag, trunk->hmask); 250 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 251 if (ifv->ifv_tag == ifv2->ifv_tag) 252 return (EEXIST); 253 254 /* 255 * Grow the hash when the number of vlans exceeds half of the number of 256 * hash buckets squared. This will make the average linked-list length 257 * buckets/2. 258 */ 259 if (trunk->refcnt > (b * b) / 2) { 260 vlan_growhash(trunk, 1); 261 i = HASH(ifv->ifv_tag, trunk->hmask); 262 } 263 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 264 trunk->refcnt++; 265 266 return (0); 267 } 268 269 static int 270 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 271 { 272 int i, b; 273 struct ifvlan *ifv2; 274 275 TRUNK_LOCK_ASSERT(trunk); 276 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 277 278 b = 1 << trunk->hwidth; 279 i = HASH(ifv->ifv_tag, trunk->hmask); 280 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 281 if (ifv2 == ifv) { 282 trunk->refcnt--; 283 LIST_REMOVE(ifv2, ifv_list); 284 if (trunk->refcnt < (b * b) / 2) 285 vlan_growhash(trunk, -1); 286 return (0); 287 } 288 289 panic("%s: vlan not found\n", __func__); 290 return (ENOENT); /*NOTREACHED*/ 291 } 292 293 /* 294 * Grow the hash larger or smaller if memory permits. 295 */ 296 static void 297 vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 298 { 299 300 struct ifvlan *ifv; 301 struct ifvlanhead *hash2; 302 int hwidth2, i, j, n, n2; 303 304 TRUNK_LOCK_ASSERT(trunk); 305 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 306 307 if (howmuch == 0) { 308 /* Harmless yet obvious coding error */ 309 printf("%s: howmuch is 0\n", __func__); 310 return; 311 } 312 313 hwidth2 = trunk->hwidth + howmuch; 314 n = 1 << trunk->hwidth; 315 n2 = 1 << hwidth2; 316 /* Do not shrink the table below the default */ 317 if (hwidth2 < VLAN_DEF_HWIDTH) 318 return; 319 320 /* M_NOWAIT because we're called with trunk mutex held */ 321 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 322 if (hash2 == NULL) { 323 printf("%s: out of memory -- hash size not changed\n", 324 __func__); 325 return; /* We can live with the old hash table */ 326 } 327 for (j = 0; j < n2; j++) 328 LIST_INIT(&hash2[j]); 329 for (i = 0; i < n; i++) 330 while (!LIST_EMPTY(&trunk->hash[i])) { 331 ifv = LIST_FIRST(&trunk->hash[i]); 332 LIST_REMOVE(ifv, ifv_list); 333 j = HASH(ifv->ifv_tag, n2 - 1); 334 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 335 } 336 free(trunk->hash, M_VLAN); 337 trunk->hash = hash2; 338 trunk->hwidth = hwidth2; 339 trunk->hmask = n2 - 1; 340 } 341 342 static __inline struct ifvlan * 343 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 344 { 345 struct ifvlan *ifv; 346 347 TRUNK_LOCK_RASSERT(trunk); 348 349 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 350 if (ifv->ifv_tag == tag) 351 return (ifv); 352 return (NULL); 353 } 354 355 #if 0 356 /* Debugging code to view the hashtables. */ 357 static void 358 vlan_dumphash(struct ifvlantrunk *trunk) 359 { 360 int i; 361 struct ifvlan *ifv; 362 363 for (i = 0; i < (1 << trunk->hwidth); i++) { 364 printf("%d: ", i); 365 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 366 printf("%s ", ifv->ifv_ifp->if_xname); 367 printf("\n"); 368 } 369 } 370 #endif /* 0 */ 371 #endif /* !VLAN_ARRAY */ 372 373 static void 374 trunk_destroy(struct ifvlantrunk *trunk) 375 { 376 VLAN_LOCK_ASSERT(); 377 378 TRUNK_LOCK(trunk); 379 #ifndef VLAN_ARRAY 380 vlan_freehash(trunk); 381 #endif 382 trunk->parent->if_vlantrunk = NULL; 383 LIST_REMOVE(trunk, trunk_entry); 384 TRUNK_UNLOCK(trunk); 385 TRUNK_LOCK_DESTROY(trunk); 386 free(trunk, M_VLAN); 387 } 388 389 /* 390 * Program our multicast filter. What we're actually doing is 391 * programming the multicast filter of the parent. This has the 392 * side effect of causing the parent interface to receive multicast 393 * traffic that it doesn't really want, which ends up being discarded 394 * later by the upper protocol layers. Unfortunately, there's no way 395 * to avoid this: there really is only one physical interface. 396 * 397 * XXX: There is a possible race here if more than one thread is 398 * modifying the multicast state of the vlan interface at the same time. 399 */ 400 static int 401 vlan_setmulti(struct ifnet *ifp) 402 { 403 struct ifnet *ifp_p; 404 struct ifmultiaddr *ifma, *rifma = NULL; 405 struct ifvlan *sc; 406 struct vlan_mc_entry *mc = NULL; 407 struct sockaddr_dl sdl; 408 int error; 409 410 /*VLAN_LOCK_ASSERT();*/ 411 412 /* Find the parent. */ 413 sc = ifp->if_softc; 414 ifp_p = PARENT(sc); 415 416 bzero((char *)&sdl, sizeof(sdl)); 417 sdl.sdl_len = sizeof(sdl); 418 sdl.sdl_family = AF_LINK; 419 sdl.sdl_index = ifp_p->if_index; 420 sdl.sdl_type = IFT_ETHER; 421 sdl.sdl_alen = ETHER_ADDR_LEN; 422 423 /* First, remove any existing filter entries. */ 424 while (SLIST_FIRST(&sc->vlan_mc_listhead) != NULL) { 425 mc = SLIST_FIRST(&sc->vlan_mc_listhead); 426 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 427 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 428 if (error) 429 return (error); 430 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 431 free(mc, M_VLAN); 432 } 433 434 /* Now program new ones. */ 435 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 436 if (ifma->ifma_addr->sa_family != AF_LINK) 437 continue; 438 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 439 if (mc == NULL) 440 return (ENOMEM); 441 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 442 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 443 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 444 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 445 LLADDR(&sdl), ETHER_ADDR_LEN); 446 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 447 if (error) 448 return (error); 449 } 450 451 return (0); 452 } 453 454 /* 455 * VLAN support can be loaded as a module. The only place in the 456 * system that's intimately aware of this is ether_input. We hook 457 * into this code through vlan_input_p which is defined there and 458 * set here. Noone else in the system should be aware of this so 459 * we use an explicit reference here. 460 */ 461 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 462 463 /* For if_link_state_change() eyes only... */ 464 extern void (*vlan_link_state_p)(struct ifnet *, int); 465 466 static int 467 vlan_modevent(module_t mod, int type, void *data) 468 { 469 470 switch (type) { 471 case MOD_LOAD: 472 LIST_INIT(&trunk_list); 473 VLAN_LOCK_INIT(); 474 vlan_input_p = vlan_input; 475 vlan_link_state_p = vlan_link_state; 476 vlan_trunk_cap_p = vlan_trunk_capabilities; 477 if_clone_attach(&vlan_cloner); 478 break; 479 case MOD_UNLOAD: 480 { 481 struct ifvlantrunk *trunk, *trunk1; 482 483 if_clone_detach(&vlan_cloner); 484 vlan_input_p = NULL; 485 vlan_link_state_p = NULL; 486 vlan_trunk_cap_p = NULL; 487 VLAN_LOCK(); 488 LIST_FOREACH_SAFE(trunk, &trunk_list, trunk_entry, trunk1) 489 trunk_destroy(trunk); 490 VLAN_UNLOCK(); 491 VLAN_LOCK_DESTROY(); 492 break; 493 } 494 default: 495 return (EOPNOTSUPP); 496 } 497 return (0); 498 } 499 500 static moduledata_t vlan_mod = { 501 "if_vlan", 502 vlan_modevent, 503 0 504 }; 505 506 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 507 MODULE_VERSION(if_vlan, 3); 508 MODULE_DEPEND(if_vlan, miibus, 1, 1, 1); 509 510 static struct ifnet * 511 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 512 { 513 const char *cp; 514 struct ifnet *ifp; 515 int t = 0; 516 517 /* Check for <etherif>.<vlan> style interface names. */ 518 IFNET_RLOCK(); 519 TAILQ_FOREACH(ifp, &ifnet, if_link) { 520 if (ifp->if_type != IFT_ETHER) 521 continue; 522 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 523 continue; 524 cp = name + strlen(ifp->if_xname); 525 if (*cp != '.') 526 continue; 527 for(; *cp != '\0'; cp++) { 528 if (*cp < '0' || *cp > '9') 529 continue; 530 t = (t * 10) + (*cp - '0'); 531 } 532 if (tag != NULL) 533 *tag = t; 534 break; 535 } 536 IFNET_RUNLOCK(); 537 538 return (ifp); 539 } 540 541 static int 542 vlan_clone_match(struct if_clone *ifc, const char *name) 543 { 544 const char *cp; 545 546 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 547 return (1); 548 549 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 550 return (0); 551 for (cp = name + 4; *cp != '\0'; cp++) { 552 if (*cp < '0' || *cp > '9') 553 return (0); 554 } 555 556 return (1); 557 } 558 559 static int 560 vlan_clone_create(struct if_clone *ifc, char *name, size_t len) 561 { 562 char *dp; 563 int wildcard; 564 int unit; 565 int error; 566 int tag; 567 int ethertag; 568 struct ifvlan *ifv; 569 struct ifnet *ifp; 570 struct ifnet *p; 571 u_char eaddr[6] = {0,0,0,0,0,0}; 572 573 if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 574 ethertag = 1; 575 unit = -1; 576 wildcard = 0; 577 578 /* 579 * Don't let the caller set up a VLAN tag with 580 * anything except VLID bits. 581 */ 582 if (tag & ~EVL_VLID_MASK) 583 return (EINVAL); 584 } else { 585 ethertag = 0; 586 587 error = ifc_name2unit(name, &unit); 588 if (error != 0) 589 return (error); 590 591 wildcard = (unit < 0); 592 } 593 594 error = ifc_alloc_unit(ifc, &unit); 595 if (error != 0) 596 return (error); 597 598 /* In the wildcard case, we need to update the name. */ 599 if (wildcard) { 600 for (dp = name; *dp != '\0'; dp++); 601 if (snprintf(dp, len - (dp-name), "%d", unit) > 602 len - (dp-name) - 1) { 603 panic("%s: interface name too long", __func__); 604 } 605 } 606 607 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 608 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 609 if (ifp == NULL) { 610 ifc_free_unit(ifc, unit); 611 free(ifv, M_VLAN); 612 return (ENOSPC); 613 } 614 SLIST_INIT(&ifv->vlan_mc_listhead); 615 616 ifp->if_softc = ifv; 617 /* 618 * Set the name manually rather than using if_initname because 619 * we don't conform to the default naming convention for interfaces. 620 */ 621 strlcpy(ifp->if_xname, name, IFNAMSIZ); 622 ifp->if_dname = ifc->ifc_name; 623 ifp->if_dunit = unit; 624 /* NB: flags are not set here */ 625 ifp->if_linkmib = &ifv->ifv_mib; 626 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 627 /* NB: mtu is not set here */ 628 629 ifp->if_init = vlan_ifinit; 630 ifp->if_start = vlan_start; 631 ifp->if_ioctl = vlan_ioctl; 632 ifp->if_snd.ifq_maxlen = ifqmaxlen; 633 ifp->if_flags = VLAN_IFFLAGS; 634 ether_ifattach(ifp, eaddr); 635 /* Now undo some of the damage... */ 636 ifp->if_baudrate = 0; 637 ifp->if_type = IFT_L2VLAN; 638 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 639 640 if (ethertag) { 641 error = vlan_config(ifv, p, tag); 642 if (error != 0) { 643 /* 644 * Since we've partialy failed, we need to back 645 * out all the way, otherwise userland could get 646 * confused. Thus, we destroy the interface. 647 */ 648 vlan_unconfig(ifp); 649 ether_ifdetach(ifp); 650 if_free_type(ifp, IFT_ETHER); 651 free(ifv, M_VLAN); 652 653 return (error); 654 } 655 ifp->if_drv_flags |= IFF_DRV_RUNNING; 656 657 /* Update flags on the parent, if necessary. */ 658 vlan_setflags(ifp, 1); 659 } 660 661 return (0); 662 } 663 664 static int 665 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 666 { 667 int unit; 668 struct ifvlan *ifv = ifp->if_softc; 669 670 unit = ifp->if_dunit; 671 672 vlan_unconfig(ifp); 673 674 ether_ifdetach(ifp); 675 if_free_type(ifp, IFT_ETHER); 676 677 free(ifv, M_VLAN); 678 679 ifc_free_unit(ifc, unit); 680 681 return (0); 682 } 683 684 /* 685 * The ifp->if_init entry point for vlan(4) is a no-op. 686 */ 687 static void 688 vlan_ifinit(void *foo) 689 { 690 691 } 692 693 /* 694 * The if_start method for vlan(4) interface. It doesn't 695 * raises the IFF_DRV_OACTIVE flag, since it is called 696 * only from IFQ_HANDOFF() macro in ether_output_frame(). 697 * If the interface queue is full, and vlan_start() is 698 * not called, the queue would never get emptied and 699 * interface would stall forever. 700 */ 701 static void 702 vlan_start(struct ifnet *ifp) 703 { 704 struct ifvlan *ifv; 705 struct ifnet *p; 706 struct mbuf *m; 707 int error; 708 709 ifv = ifp->if_softc; 710 p = PARENT(ifv); 711 712 for (;;) { 713 IF_DEQUEUE(&ifp->if_snd, m); 714 if (m == 0) 715 break; 716 BPF_MTAP(ifp, m); 717 718 /* 719 * Do not run parent's if_start() if the parent is not up, 720 * or parent's driver will cause a system crash. 721 */ 722 if (!((p->if_flags & IFF_UP) && 723 (p->if_drv_flags & IFF_DRV_RUNNING))) { 724 m_freem(m); 725 ifp->if_collisions++; 726 continue; 727 } 728 729 /* 730 * If underlying interface can do VLAN tag insertion itself, 731 * just pass the packet along. However, we need some way to 732 * tell the interface where the packet came from so that it 733 * knows how to find the VLAN tag to use, so we attach a 734 * packet tag that holds it. 735 */ 736 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 737 struct m_tag *mtag = (struct m_tag *) 738 uma_zalloc(zone_mtag_vlan, M_NOWAIT); 739 if (mtag == NULL) { 740 ifp->if_oerrors++; 741 m_freem(m); 742 continue; 743 } 744 VLAN_TAG_VALUE(mtag) = ifv->ifv_tag; 745 m_tag_prepend(m, mtag); 746 m->m_flags |= M_VLANTAG; 747 } else { 748 struct ether_vlan_header *evl; 749 750 M_PREPEND(m, ifv->ifv_encaplen, M_DONTWAIT); 751 if (m == NULL) { 752 if_printf(ifp, 753 "unable to prepend VLAN header\n"); 754 ifp->if_oerrors++; 755 continue; 756 } 757 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */ 758 759 if (m->m_len < sizeof(*evl)) { 760 m = m_pullup(m, sizeof(*evl)); 761 if (m == NULL) { 762 if_printf(ifp, 763 "cannot pullup VLAN header\n"); 764 ifp->if_oerrors++; 765 continue; 766 } 767 } 768 769 /* 770 * Transform the Ethernet header into an Ethernet header 771 * with 802.1Q encapsulation. 772 */ 773 bcopy(mtod(m, char *) + ifv->ifv_encaplen, 774 mtod(m, char *), ETHER_HDR_LEN); 775 evl = mtod(m, struct ether_vlan_header *); 776 evl->evl_proto = evl->evl_encap_proto; 777 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 778 evl->evl_tag = htons(ifv->ifv_tag); 779 #ifdef DEBUG 780 printf("%s: %*D\n", __func__, (int)sizeof(*evl), 781 (unsigned char *)evl, ":"); 782 #endif 783 } 784 785 /* 786 * Send it, precisely as ether_output() would have. 787 * We are already running at splimp. 788 */ 789 IFQ_HANDOFF(p, m, error); 790 if (!error) 791 ifp->if_opackets++; 792 else 793 ifp->if_oerrors++; 794 } 795 } 796 797 static void 798 vlan_input(struct ifnet *ifp, struct mbuf *m) 799 { 800 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 801 struct ifvlan *ifv; 802 struct m_tag *mtag; 803 uint16_t tag; 804 805 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 806 807 if (m->m_flags & M_VLANTAG) { 808 /* 809 * Packet is tagged, but m contains a normal 810 * Ethernet frame; the tag is stored out-of-band. 811 */ 812 mtag = m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL); 813 KASSERT(mtag != NULL, 814 ("%s: M_VLANTAG without m_tag", __func__)); 815 tag = EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)); 816 m_tag_delete(m, mtag); 817 m->m_flags &= ~M_VLANTAG; 818 } else { 819 struct ether_vlan_header *evl; 820 821 /* 822 * Packet is tagged in-band as specified by 802.1q. 823 */ 824 mtag = NULL; 825 switch (ifp->if_type) { 826 case IFT_ETHER: 827 if (m->m_len < sizeof(*evl) && 828 (m = m_pullup(m, sizeof(*evl))) == NULL) { 829 if_printf(ifp, "cannot pullup VLAN header\n"); 830 return; 831 } 832 evl = mtod(m, struct ether_vlan_header *); 833 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN, 834 ("%s: bad encapsulation protocol (%u)", 835 __func__, ntohs(evl->evl_encap_proto))); 836 837 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 838 839 /* 840 * Restore the original ethertype. We'll remove 841 * the encapsulation after we've found the vlan 842 * interface corresponding to the tag. 843 */ 844 evl->evl_encap_proto = evl->evl_proto; 845 break; 846 default: 847 tag = (uint16_t) -1; 848 #ifdef INVARIANTS 849 panic("%s: unsupported if_type (%u)", 850 __func__, ifp->if_type); 851 #endif 852 break; 853 } 854 } 855 856 /* 857 * In VLAN_ARRAY case we proceed completely lockless. 858 */ 859 #ifdef VLAN_ARRAY 860 ifv = trunk->vlans[tag]; 861 if (ifv == NULL || (ifv->ifv_ifp->if_flags & IFF_UP) == 0) { 862 m_freem(m); 863 ifp->if_noproto++; 864 return; 865 } 866 #else 867 TRUNK_RLOCK(trunk); 868 ifv = vlan_gethash(trunk, tag); 869 if (ifv == NULL || (ifv->ifv_ifp->if_flags & IFF_UP) == 0) { 870 TRUNK_RUNLOCK(trunk); 871 m_freem(m); 872 ifp->if_noproto++; 873 return; 874 } 875 TRUNK_RUNLOCK(trunk); 876 #endif 877 878 if (mtag == NULL) { 879 /* 880 * Packet had an in-line encapsulation header; 881 * remove it. The original header has already 882 * been fixed up above. 883 */ 884 bcopy(mtod(m, caddr_t), 885 mtod(m, caddr_t) + ETHER_VLAN_ENCAP_LEN, 886 ETHER_HDR_LEN); 887 m_adj(m, ETHER_VLAN_ENCAP_LEN); 888 } 889 890 m->m_pkthdr.rcvif = ifv->ifv_ifp; 891 ifv->ifv_ifp->if_ipackets++; 892 893 /* Pass it back through the parent's input routine. */ 894 (*ifp->if_input)(ifv->ifv_ifp, m); 895 } 896 897 static int 898 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 899 { 900 struct ifvlantrunk *trunk; 901 struct ifnet *ifp; 902 int error = 0; 903 904 /* VID numbers 0x0 and 0xFFF are reserved */ 905 if (tag == 0 || tag == 0xFFF) 906 return (EINVAL); 907 if (p->if_type != IFT_ETHER) 908 return (EPROTONOSUPPORT); 909 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 910 return (EPROTONOSUPPORT); 911 if (ifv->ifv_trunk) 912 return (EBUSY); 913 914 if (p->if_vlantrunk == NULL) { 915 trunk = malloc(sizeof(struct ifvlantrunk), 916 M_VLAN, M_WAITOK | M_ZERO); 917 #ifndef VLAN_ARRAY 918 vlan_inithash(trunk); 919 #endif 920 VLAN_LOCK(); 921 if (p->if_vlantrunk != NULL) { 922 /* A race that that is very unlikely to be hit. */ 923 #ifndef VLAN_ARRAY 924 vlan_freehash(trunk); 925 #endif 926 free(trunk, M_VLAN); 927 goto exists; 928 } 929 TRUNK_LOCK_INIT(trunk); 930 LIST_INSERT_HEAD(&trunk_list, trunk, trunk_entry); 931 TRUNK_LOCK(trunk); 932 p->if_vlantrunk = trunk; 933 trunk->parent = p; 934 } else { 935 VLAN_LOCK(); 936 exists: 937 trunk = p->if_vlantrunk; 938 TRUNK_LOCK(trunk); 939 } 940 941 ifv->ifv_tag = tag; 942 #ifdef VLAN_ARRAY 943 if (trunk->vlans[tag] != NULL) 944 error = EEXIST; 945 #else 946 error = vlan_inshash(trunk, ifv); 947 #endif 948 if (error) 949 goto done; 950 951 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 952 ifv->ifv_mintu = ETHERMIN; 953 ifv->ifv_pflags = 0; 954 955 /* 956 * If the parent supports the VLAN_MTU capability, 957 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 958 * use it. 959 */ 960 if (p->if_capenable & IFCAP_VLAN_MTU) { 961 /* 962 * No need to fudge the MTU since the parent can 963 * handle extended frames. 964 */ 965 ifv->ifv_mtufudge = 0; 966 } else { 967 /* 968 * Fudge the MTU by the encapsulation size. This 969 * makes us incompatible with strictly compliant 970 * 802.1Q implementations, but allows us to use 971 * the feature with other NetBSD implementations, 972 * which might still be useful. 973 */ 974 ifv->ifv_mtufudge = ifv->ifv_encaplen; 975 } 976 977 ifv->ifv_trunk = trunk; 978 ifp = ifv->ifv_ifp; 979 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 980 ifp->if_baudrate = p->if_baudrate; 981 /* 982 * Copy only a selected subset of flags from the parent. 983 * Other flags are none of our business. 984 */ 985 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 986 ifp->if_flags &= ~VLAN_COPY_FLAGS; 987 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 988 #undef VLAN_COPY_FLAGS 989 990 ifp->if_link_state = p->if_link_state; 991 992 vlan_capabilities(ifv); 993 994 /* 995 * Set up our ``Ethernet address'' to reflect the underlying 996 * physical interface's. 997 */ 998 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 999 1000 /* 1001 * Configure multicast addresses that may already be 1002 * joined on the vlan device. 1003 */ 1004 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1005 1006 #ifdef VLAN_ARRAY 1007 atomic_store_rel_ptr((uintptr_t *)&trunk->vlans[tag], (uintptr_t)ifv); 1008 trunk->refcnt++; 1009 #endif 1010 done: 1011 TRUNK_UNLOCK(trunk); 1012 VLAN_UNLOCK(); 1013 1014 return (error); 1015 } 1016 1017 static int 1018 vlan_unconfig(struct ifnet *ifp) 1019 { 1020 struct ifvlantrunk *trunk; 1021 struct vlan_mc_entry *mc; 1022 struct ifvlan *ifv; 1023 int error; 1024 1025 VLAN_LOCK(); 1026 1027 ifv = ifp->if_softc; 1028 trunk = ifv->ifv_trunk; 1029 1030 if (trunk) { 1031 struct sockaddr_dl sdl; 1032 struct ifnet *p = trunk->parent; 1033 1034 TRUNK_LOCK(trunk); 1035 #ifdef VLAN_ARRAY 1036 atomic_store_rel_ptr((uintptr_t *)&trunk->vlans[ifv->ifv_tag], 1037 (uintptr_t)NULL); 1038 trunk->refcnt--; 1039 #endif 1040 1041 /* 1042 * Since the interface is being unconfigured, we need to 1043 * empty the list of multicast groups that we may have joined 1044 * while we were alive from the parent's list. 1045 */ 1046 bzero((char *)&sdl, sizeof(sdl)); 1047 sdl.sdl_len = sizeof(sdl); 1048 sdl.sdl_family = AF_LINK; 1049 sdl.sdl_index = p->if_index; 1050 sdl.sdl_type = IFT_ETHER; 1051 sdl.sdl_alen = ETHER_ADDR_LEN; 1052 1053 while(SLIST_FIRST(&ifv->vlan_mc_listhead) != NULL) { 1054 mc = SLIST_FIRST(&ifv->vlan_mc_listhead); 1055 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1056 ETHER_ADDR_LEN); 1057 error = if_delmulti(p, (struct sockaddr *)&sdl); 1058 if (error) 1059 return (error); 1060 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1061 free(mc, M_VLAN); 1062 } 1063 1064 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1065 #ifndef VLAN_ARRAY 1066 vlan_remhash(trunk, ifv); 1067 #endif 1068 ifv->ifv_trunk = NULL; 1069 1070 /* 1071 * Check if we were the last. 1072 */ 1073 if (trunk->refcnt == 0) { 1074 atomic_store_rel_ptr((uintptr_t *) 1075 &trunk->parent->if_vlantrunk, 1076 (uintptr_t)NULL); 1077 /* 1078 * XXXGL: If some ithread has already entered 1079 * vlan_input() and is now blocked on the trunk 1080 * lock, then it should preempt us right after 1081 * unlock and finish its work. Then we will acquire 1082 * lock again in trunk_destroy(). 1083 * XXX: not true in case of VLAN_ARRAY 1084 */ 1085 TRUNK_UNLOCK(trunk); 1086 trunk_destroy(trunk); 1087 } else 1088 TRUNK_UNLOCK(trunk); 1089 } 1090 1091 /* Disconnect from parent. */ 1092 if (ifv->ifv_pflags) 1093 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1094 ifv->ifv_ifp->if_mtu = ETHERMTU; /* XXX why not 0? */ 1095 ifv->ifv_ifp->if_link_state = LINK_STATE_UNKNOWN; 1096 1097 /* Clear our MAC address. */ 1098 bzero(IF_LLADDR(ifv->ifv_ifp), ETHER_ADDR_LEN); 1099 1100 VLAN_UNLOCK(); 1101 1102 return (0); 1103 } 1104 1105 /* Handle a reference counted flag that should be set on the parent as well */ 1106 static int 1107 vlan_setflag(struct ifnet *ifp, int flag, int status, 1108 int (*func)(struct ifnet *, int)) 1109 { 1110 struct ifvlan *ifv; 1111 int error; 1112 1113 /* XXX VLAN_LOCK_ASSERT(); */ 1114 1115 ifv = ifp->if_softc; 1116 status = status ? (ifp->if_flags & flag) : 0; 1117 /* Now "status" contains the flag value or 0 */ 1118 1119 /* 1120 * See if recorded parent's status is different from what 1121 * we want it to be. If it is, flip it. We record parent's 1122 * status in ifv_pflags so that we won't clear parent's flag 1123 * we haven't set. In fact, we don't clear or set parent's 1124 * flags directly, but get or release references to them. 1125 * That's why we can be sure that recorded flags still are 1126 * in accord with actual parent's flags. 1127 */ 1128 if (status != (ifv->ifv_pflags & flag)) { 1129 error = (*func)(PARENT(ifv), status); 1130 if (error) 1131 return (error); 1132 ifv->ifv_pflags &= ~flag; 1133 ifv->ifv_pflags |= status; 1134 } 1135 return (0); 1136 } 1137 1138 /* 1139 * Handle IFF_* flags that require certain changes on the parent: 1140 * if "status" is true, update parent's flags respective to our if_flags; 1141 * if "status" is false, forcedly clear the flags set on parent. 1142 */ 1143 static int 1144 vlan_setflags(struct ifnet *ifp, int status) 1145 { 1146 int error, i; 1147 1148 for (i = 0; vlan_pflags[i].flag; i++) { 1149 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1150 status, vlan_pflags[i].func); 1151 if (error) 1152 return (error); 1153 } 1154 return (0); 1155 } 1156 1157 /* Inform all vlans that their parent has changed link state */ 1158 static void 1159 vlan_link_state(struct ifnet *ifp, int link) 1160 { 1161 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1162 struct ifvlan *ifv; 1163 int i; 1164 1165 TRUNK_LOCK(trunk); 1166 #ifdef VLAN_ARRAY 1167 for (i = 0; i < EVL_VLID_MASK+1; i++) 1168 if (trunk->vlans[i] != NULL) { 1169 ifv = trunk->vlans[i]; 1170 #else 1171 for (i = 0; i < (1 << trunk->hwidth); i++) { 1172 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1173 #endif 1174 if_link_state_change(ifv->ifv_ifp, 1175 trunk->parent->if_link_state); 1176 } 1177 TRUNK_UNLOCK(trunk); 1178 } 1179 1180 static void 1181 vlan_capabilities(struct ifvlan *ifv) 1182 { 1183 struct ifnet *p = PARENT(ifv); 1184 struct ifnet *ifp = ifv->ifv_ifp; 1185 1186 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1187 1188 /* 1189 * If the parent interface can do checksum offloading 1190 * on VLANs, then propagate its hardware-assisted 1191 * checksumming flags. Also assert that checksum 1192 * offloading requires hardware VLAN tagging. 1193 */ 1194 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1195 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1196 1197 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1198 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1199 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1200 ifp->if_hwassist = p->if_hwassist; 1201 } else { 1202 ifp->if_capenable = 0; 1203 ifp->if_hwassist = 0; 1204 } 1205 } 1206 1207 static void 1208 vlan_trunk_capabilities(struct ifnet *ifp) 1209 { 1210 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1211 struct ifvlan *ifv; 1212 int i; 1213 1214 TRUNK_LOCK(trunk); 1215 #ifdef VLAN_ARRAY 1216 for (i = 0; i < EVL_VLID_MASK+1; i++) 1217 if (trunk->vlans[i] != NULL) { 1218 ifv = trunk->vlans[i]; 1219 #else 1220 for (i = 0; i < (1 << trunk->hwidth); i++) { 1221 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1222 #endif 1223 vlan_capabilities(ifv); 1224 } 1225 TRUNK_UNLOCK(trunk); 1226 } 1227 1228 static int 1229 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1230 { 1231 struct ifaddr *ifa; 1232 struct ifnet *p; 1233 struct ifreq *ifr; 1234 struct ifvlan *ifv; 1235 struct vlanreq vlr; 1236 int error = 0; 1237 1238 ifr = (struct ifreq *)data; 1239 ifa = (struct ifaddr *)data; 1240 ifv = ifp->if_softc; 1241 1242 switch (cmd) { 1243 case SIOCSIFADDR: 1244 ifp->if_flags |= IFF_UP; 1245 1246 switch (ifa->ifa_addr->sa_family) { 1247 #ifdef INET 1248 case AF_INET: 1249 arp_ifinit(ifv->ifv_ifp, ifa); 1250 break; 1251 #endif 1252 default: 1253 break; 1254 } 1255 break; 1256 1257 case SIOCGIFADDR: 1258 { 1259 struct sockaddr *sa; 1260 1261 sa = (struct sockaddr *) &ifr->ifr_data; 1262 bcopy(IF_LLADDR(ifp), (caddr_t)sa->sa_data, 1263 ETHER_ADDR_LEN); 1264 } 1265 break; 1266 1267 case SIOCGIFMEDIA: 1268 VLAN_LOCK(); 1269 if (TRUNK(ifv) != NULL) { 1270 error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv), 1271 SIOCGIFMEDIA, data); 1272 VLAN_UNLOCK(); 1273 /* Limit the result to the parent's current config. */ 1274 if (error == 0) { 1275 struct ifmediareq *ifmr; 1276 1277 ifmr = (struct ifmediareq *)data; 1278 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1279 ifmr->ifm_count = 1; 1280 error = copyout(&ifmr->ifm_current, 1281 ifmr->ifm_ulist, 1282 sizeof(int)); 1283 } 1284 } 1285 } else { 1286 VLAN_UNLOCK(); 1287 error = EINVAL; 1288 } 1289 break; 1290 1291 case SIOCSIFMEDIA: 1292 error = EINVAL; 1293 break; 1294 1295 case SIOCSIFMTU: 1296 /* 1297 * Set the interface MTU. 1298 */ 1299 VLAN_LOCK(); 1300 if (TRUNK(ifv) != NULL) { 1301 if (ifr->ifr_mtu > 1302 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1303 ifr->ifr_mtu < 1304 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1305 error = EINVAL; 1306 else 1307 ifp->if_mtu = ifr->ifr_mtu; 1308 } else 1309 error = EINVAL; 1310 VLAN_UNLOCK(); 1311 break; 1312 1313 case SIOCSETVLAN: 1314 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1315 if (error) 1316 break; 1317 if (vlr.vlr_parent[0] == '\0') { 1318 vlan_unconfig(ifp); 1319 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1320 break; 1321 } 1322 p = ifunit(vlr.vlr_parent); 1323 if (p == 0) { 1324 error = ENOENT; 1325 break; 1326 } 1327 /* 1328 * Don't let the caller set up a VLAN tag with 1329 * anything except VLID bits. 1330 */ 1331 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1332 error = EINVAL; 1333 break; 1334 } 1335 error = vlan_config(ifv, p, vlr.vlr_tag); 1336 if (error) 1337 break; 1338 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1339 1340 /* Update flags on the parent, if necessary. */ 1341 vlan_setflags(ifp, 1); 1342 break; 1343 1344 case SIOCGETVLAN: 1345 bzero(&vlr, sizeof(vlr)); 1346 VLAN_LOCK(); 1347 if (TRUNK(ifv) != NULL) { 1348 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1349 sizeof(vlr.vlr_parent)); 1350 vlr.vlr_tag = ifv->ifv_tag; 1351 } 1352 VLAN_UNLOCK(); 1353 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1354 break; 1355 1356 case SIOCSIFFLAGS: 1357 /* 1358 * We should propagate selected flags to the parent, 1359 * e.g., promiscuous mode. 1360 */ 1361 if (TRUNK(ifv) != NULL) 1362 error = vlan_setflags(ifp, 1); 1363 break; 1364 1365 case SIOCADDMULTI: 1366 case SIOCDELMULTI: 1367 /* 1368 * If we don't have a parent, just remember the membership for 1369 * when we do. 1370 */ 1371 if (TRUNK(ifv) != NULL) 1372 error = vlan_setmulti(ifp); 1373 break; 1374 1375 default: 1376 error = EINVAL; 1377 } 1378 1379 return (error); 1380 } 1381