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 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 85 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 86 #else 87 struct ifvlanhead *hash; /* dynamic hash-list table */ 88 uint16_t hmask; 89 uint16_t hwidth; 90 #endif 91 int refcnt; 92 LIST_ENTRY(ifvlantrunk) trunk_entry; 93 }; 94 static LIST_HEAD(, ifvlantrunk) trunk_list; 95 96 struct vlan_mc_entry { 97 struct ether_addr mc_addr; 98 SLIST_ENTRY(vlan_mc_entry) mc_entries; 99 }; 100 101 struct ifvlan { 102 struct ifvlantrunk *ifv_trunk; 103 struct ifnet *ifv_ifp; 104 #define TRUNK(ifv) ((ifv)->ifv_trunk) 105 #define PARENT(ifv) ((ifv)->ifv_trunk->parent) 106 int ifv_pflags; /* special flags we have set on parent */ 107 struct ifv_linkmib { 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_mc_entry) vlan_mc_listhead; 115 LIST_ENTRY(ifvlan) ifv_list; 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 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 135 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 136 137 static int soft_pad = 0; 138 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 139 "pad short frames before tagging"); 140 141 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 142 143 static eventhandler_tag ifdetach_tag; 144 145 /* 146 * We have a global mutex, that is used to serialize configuration 147 * changes and isn't used in normal packet delivery. 148 * 149 * We also have a per-trunk rwlock, that is locked shared on packet 150 * processing and exclusive when configuration is changed. 151 * 152 * The VLAN_ARRAY substitutes the dynamic hash with a static array 153 * with 4096 entries. In theory this can give a boost in processing, 154 * however on practice it does not. Probably this is because array 155 * is too big to fit into CPU cache. 156 */ 157 static struct mtx ifv_mtx; 158 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 159 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 160 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 161 #define VLAN_LOCK() mtx_lock(&ifv_mtx) 162 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 163 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 164 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 165 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 166 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 167 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 168 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 169 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 170 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 171 172 #ifndef VLAN_ARRAY 173 static void vlan_inithash(struct ifvlantrunk *trunk); 174 static void vlan_freehash(struct ifvlantrunk *trunk); 175 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 176 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 177 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 178 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 179 uint16_t tag); 180 #endif 181 static void trunk_destroy(struct ifvlantrunk *trunk); 182 183 static void vlan_start(struct ifnet *ifp); 184 static void vlan_init(void *foo); 185 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 186 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 187 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 188 int (*func)(struct ifnet *, int)); 189 static int vlan_setflags(struct ifnet *ifp, int status); 190 static int vlan_setmulti(struct ifnet *ifp); 191 static int vlan_unconfig(struct ifnet *ifp); 192 static int vlan_unconfig_locked(struct ifnet *ifp); 193 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 194 static void vlan_link_state(struct ifnet *ifp, int link); 195 static void vlan_capabilities(struct ifvlan *ifv); 196 static void vlan_trunk_capabilities(struct ifnet *ifp); 197 198 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 199 const char *, int *); 200 static int vlan_clone_match(struct if_clone *, const char *); 201 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 202 static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 203 204 static void vlan_ifdetach(void *arg, struct ifnet *ifp); 205 206 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 207 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 208 209 #ifndef VLAN_ARRAY 210 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 211 212 static void 213 vlan_inithash(struct ifvlantrunk *trunk) 214 { 215 int i, n; 216 217 /* 218 * The trunk must not be locked here since we call malloc(M_WAITOK). 219 * It is OK in case this function is called before the trunk struct 220 * gets hooked up and becomes visible from other threads. 221 */ 222 223 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 224 ("%s: hash already initialized", __func__)); 225 226 trunk->hwidth = VLAN_DEF_HWIDTH; 227 n = 1 << trunk->hwidth; 228 trunk->hmask = n - 1; 229 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 230 for (i = 0; i < n; i++) 231 LIST_INIT(&trunk->hash[i]); 232 } 233 234 static void 235 vlan_freehash(struct ifvlantrunk *trunk) 236 { 237 #ifdef INVARIANTS 238 int i; 239 240 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 241 for (i = 0; i < (1 << trunk->hwidth); i++) 242 KASSERT(LIST_EMPTY(&trunk->hash[i]), 243 ("%s: hash table not empty", __func__)); 244 #endif 245 free(trunk->hash, M_VLAN); 246 trunk->hash = NULL; 247 trunk->hwidth = trunk->hmask = 0; 248 } 249 250 static int 251 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 252 { 253 int i, b; 254 struct ifvlan *ifv2; 255 256 TRUNK_LOCK_ASSERT(trunk); 257 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 258 259 b = 1 << trunk->hwidth; 260 i = HASH(ifv->ifv_tag, trunk->hmask); 261 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 262 if (ifv->ifv_tag == ifv2->ifv_tag) 263 return (EEXIST); 264 265 /* 266 * Grow the hash when the number of vlans exceeds half of the number of 267 * hash buckets squared. This will make the average linked-list length 268 * buckets/2. 269 */ 270 if (trunk->refcnt > (b * b) / 2) { 271 vlan_growhash(trunk, 1); 272 i = HASH(ifv->ifv_tag, trunk->hmask); 273 } 274 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 275 trunk->refcnt++; 276 277 return (0); 278 } 279 280 static int 281 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 282 { 283 int i, b; 284 struct ifvlan *ifv2; 285 286 TRUNK_LOCK_ASSERT(trunk); 287 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 288 289 b = 1 << trunk->hwidth; 290 i = HASH(ifv->ifv_tag, trunk->hmask); 291 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 292 if (ifv2 == ifv) { 293 trunk->refcnt--; 294 LIST_REMOVE(ifv2, ifv_list); 295 if (trunk->refcnt < (b * b) / 2) 296 vlan_growhash(trunk, -1); 297 return (0); 298 } 299 300 panic("%s: vlan not found\n", __func__); 301 return (ENOENT); /*NOTREACHED*/ 302 } 303 304 /* 305 * Grow the hash larger or smaller if memory permits. 306 */ 307 static void 308 vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 309 { 310 311 struct ifvlan *ifv; 312 struct ifvlanhead *hash2; 313 int hwidth2, i, j, n, n2; 314 315 TRUNK_LOCK_ASSERT(trunk); 316 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 317 318 if (howmuch == 0) { 319 /* Harmless yet obvious coding error */ 320 printf("%s: howmuch is 0\n", __func__); 321 return; 322 } 323 324 hwidth2 = trunk->hwidth + howmuch; 325 n = 1 << trunk->hwidth; 326 n2 = 1 << hwidth2; 327 /* Do not shrink the table below the default */ 328 if (hwidth2 < VLAN_DEF_HWIDTH) 329 return; 330 331 /* M_NOWAIT because we're called with trunk mutex held */ 332 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 333 if (hash2 == NULL) { 334 printf("%s: out of memory -- hash size not changed\n", 335 __func__); 336 return; /* We can live with the old hash table */ 337 } 338 for (j = 0; j < n2; j++) 339 LIST_INIT(&hash2[j]); 340 for (i = 0; i < n; i++) 341 while (!LIST_EMPTY(&trunk->hash[i])) { 342 ifv = LIST_FIRST(&trunk->hash[i]); 343 LIST_REMOVE(ifv, ifv_list); 344 j = HASH(ifv->ifv_tag, n2 - 1); 345 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 346 } 347 free(trunk->hash, M_VLAN); 348 trunk->hash = hash2; 349 trunk->hwidth = hwidth2; 350 trunk->hmask = n2 - 1; 351 } 352 353 static __inline struct ifvlan * 354 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 355 { 356 struct ifvlan *ifv; 357 358 TRUNK_LOCK_RASSERT(trunk); 359 360 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 361 if (ifv->ifv_tag == tag) 362 return (ifv); 363 return (NULL); 364 } 365 366 #if 0 367 /* Debugging code to view the hashtables. */ 368 static void 369 vlan_dumphash(struct ifvlantrunk *trunk) 370 { 371 int i; 372 struct ifvlan *ifv; 373 374 for (i = 0; i < (1 << trunk->hwidth); i++) { 375 printf("%d: ", i); 376 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 377 printf("%s ", ifv->ifv_ifp->if_xname); 378 printf("\n"); 379 } 380 } 381 #endif /* 0 */ 382 #endif /* !VLAN_ARRAY */ 383 384 static void 385 trunk_destroy(struct ifvlantrunk *trunk) 386 { 387 VLAN_LOCK_ASSERT(); 388 389 TRUNK_LOCK(trunk); 390 #ifndef VLAN_ARRAY 391 vlan_freehash(trunk); 392 #endif 393 trunk->parent->if_vlantrunk = NULL; 394 LIST_REMOVE(trunk, trunk_entry); 395 TRUNK_UNLOCK(trunk); 396 TRUNK_LOCK_DESTROY(trunk); 397 free(trunk, M_VLAN); 398 } 399 400 /* 401 * Program our multicast filter. What we're actually doing is 402 * programming the multicast filter of the parent. This has the 403 * side effect of causing the parent interface to receive multicast 404 * traffic that it doesn't really want, which ends up being discarded 405 * later by the upper protocol layers. Unfortunately, there's no way 406 * to avoid this: there really is only one physical interface. 407 * 408 * XXX: There is a possible race here if more than one thread is 409 * modifying the multicast state of the vlan interface at the same time. 410 */ 411 static int 412 vlan_setmulti(struct ifnet *ifp) 413 { 414 struct ifnet *ifp_p; 415 struct ifmultiaddr *ifma, *rifma = NULL; 416 struct ifvlan *sc; 417 struct vlan_mc_entry *mc = NULL; 418 struct sockaddr_dl sdl; 419 int error; 420 421 /*VLAN_LOCK_ASSERT();*/ 422 423 /* Find the parent. */ 424 sc = ifp->if_softc; 425 ifp_p = PARENT(sc); 426 427 bzero((char *)&sdl, sizeof(sdl)); 428 sdl.sdl_len = sizeof(sdl); 429 sdl.sdl_family = AF_LINK; 430 sdl.sdl_index = ifp_p->if_index; 431 sdl.sdl_type = IFT_ETHER; 432 sdl.sdl_alen = ETHER_ADDR_LEN; 433 434 /* First, remove any existing filter entries. */ 435 while (SLIST_FIRST(&sc->vlan_mc_listhead) != NULL) { 436 mc = SLIST_FIRST(&sc->vlan_mc_listhead); 437 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 438 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 439 if (error) 440 return (error); 441 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 442 free(mc, M_VLAN); 443 } 444 445 /* Now program new ones. */ 446 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 447 if (ifma->ifma_addr->sa_family != AF_LINK) 448 continue; 449 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 450 if (mc == NULL) 451 return (ENOMEM); 452 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 453 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 454 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 455 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 456 LLADDR(&sdl), ETHER_ADDR_LEN); 457 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 458 if (error) 459 return (error); 460 } 461 462 return (0); 463 } 464 465 /* 466 * A handler for network interface departure events. 467 * Track departure of trunks here so that we don't access invalid 468 * pointers or whatever if a trunk is ripped from under us, e.g., 469 * by ejecting its hot-plug card. 470 */ 471 static void 472 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 473 { 474 struct ifvlan *ifv; 475 int i; 476 477 /* 478 * Check if it's a trunk interface first of all 479 * to avoid needless locking. 480 */ 481 if (ifp->if_vlantrunk == NULL) 482 return; 483 484 VLAN_LOCK(); 485 /* 486 * OK, it's a trunk. Loop over and detach all vlan's on it. 487 * Check trunk pointer after each vlan_unconfig() as it will 488 * free it and set to NULL after the last vlan was detached. 489 */ 490 #ifdef VLAN_ARRAY 491 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 492 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 493 vlan_unconfig_locked(ifv->ifv_ifp); 494 if (ifp->if_vlantrunk == NULL) 495 break; 496 } 497 #else /* VLAN_ARRAY */ 498 restart: 499 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 500 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 501 vlan_unconfig_locked(ifv->ifv_ifp); 502 if (ifp->if_vlantrunk) 503 goto restart; /* trunk->hwidth can change */ 504 else 505 break; 506 } 507 #endif /* VLAN_ARRAY */ 508 /* Trunk should have been destroyed in vlan_unconfig(). */ 509 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 510 VLAN_UNLOCK(); 511 } 512 513 /* 514 * VLAN support can be loaded as a module. The only place in the 515 * system that's intimately aware of this is ether_input. We hook 516 * into this code through vlan_input_p which is defined there and 517 * set here. Noone else in the system should be aware of this so 518 * we use an explicit reference here. 519 */ 520 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 521 522 /* For if_link_state_change() eyes only... */ 523 extern void (*vlan_link_state_p)(struct ifnet *, int); 524 525 static int 526 vlan_modevent(module_t mod, int type, void *data) 527 { 528 529 switch (type) { 530 case MOD_LOAD: 531 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 532 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 533 if (ifdetach_tag == NULL) 534 return (ENOMEM); 535 LIST_INIT(&trunk_list); 536 VLAN_LOCK_INIT(); 537 vlan_input_p = vlan_input; 538 vlan_link_state_p = vlan_link_state; 539 vlan_trunk_cap_p = vlan_trunk_capabilities; 540 if_clone_attach(&vlan_cloner); 541 break; 542 case MOD_UNLOAD: 543 { 544 struct ifvlantrunk *trunk, *trunk1; 545 546 if_clone_detach(&vlan_cloner); 547 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 548 vlan_input_p = NULL; 549 vlan_link_state_p = NULL; 550 vlan_trunk_cap_p = NULL; 551 VLAN_LOCK(); 552 LIST_FOREACH_SAFE(trunk, &trunk_list, trunk_entry, trunk1) 553 trunk_destroy(trunk); 554 VLAN_UNLOCK(); 555 VLAN_LOCK_DESTROY(); 556 break; 557 } 558 default: 559 return (EOPNOTSUPP); 560 } 561 return (0); 562 } 563 564 static moduledata_t vlan_mod = { 565 "if_vlan", 566 vlan_modevent, 567 0 568 }; 569 570 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 571 MODULE_VERSION(if_vlan, 3); 572 MODULE_DEPEND(if_vlan, miibus, 1, 1, 1); 573 574 static struct ifnet * 575 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 576 { 577 const char *cp; 578 struct ifnet *ifp; 579 int t = 0; 580 581 /* Check for <etherif>.<vlan> style interface names. */ 582 IFNET_RLOCK(); 583 TAILQ_FOREACH(ifp, &ifnet, if_link) { 584 if (ifp->if_type != IFT_ETHER) 585 continue; 586 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 587 continue; 588 cp = name + strlen(ifp->if_xname); 589 if (*cp != '.') 590 continue; 591 for(; *cp != '\0'; cp++) { 592 if (*cp < '0' || *cp > '9') 593 continue; 594 t = (t * 10) + (*cp - '0'); 595 } 596 if (tag != NULL) 597 *tag = t; 598 break; 599 } 600 IFNET_RUNLOCK(); 601 602 return (ifp); 603 } 604 605 static int 606 vlan_clone_match(struct if_clone *ifc, const char *name) 607 { 608 const char *cp; 609 610 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 611 return (1); 612 613 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 614 return (0); 615 for (cp = name + 4; *cp != '\0'; cp++) { 616 if (*cp < '0' || *cp > '9') 617 return (0); 618 } 619 620 return (1); 621 } 622 623 static int 624 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 625 { 626 char *dp; 627 int wildcard; 628 int unit; 629 int error; 630 int tag; 631 int ethertag; 632 struct ifvlan *ifv; 633 struct ifnet *ifp; 634 struct ifnet *p; 635 struct vlanreq vlr; 636 static const u_char eaddr[6]; /* 00:00:00:00:00:00 */ 637 638 /* 639 * There are 3 (ugh) ways to specify the cloned device: 640 * o pass a parameter block with the clone request. 641 * o specify parameters in the text of the clone device name 642 * o specify no parameters and get an unattached device that 643 * must be configured separately. 644 * The first technique is preferred; the latter two are 645 * supported for backwards compatibilty. 646 */ 647 if (params) { 648 error = copyin(params, &vlr, sizeof(vlr)); 649 if (error) 650 return error; 651 p = ifunit(vlr.vlr_parent); 652 if (p == NULL) 653 return ENXIO; 654 /* 655 * Don't let the caller set up a VLAN tag with 656 * anything except VLID bits. 657 */ 658 if (vlr.vlr_tag & ~EVL_VLID_MASK) 659 return (EINVAL); 660 error = ifc_name2unit(name, &unit); 661 if (error != 0) 662 return (error); 663 664 ethertag = 1; 665 tag = vlr.vlr_tag; 666 wildcard = (unit < 0); 667 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 668 ethertag = 1; 669 unit = -1; 670 wildcard = 0; 671 672 /* 673 * Don't let the caller set up a VLAN tag with 674 * anything except VLID bits. 675 */ 676 if (tag & ~EVL_VLID_MASK) 677 return (EINVAL); 678 } else { 679 ethertag = 0; 680 681 error = ifc_name2unit(name, &unit); 682 if (error != 0) 683 return (error); 684 685 wildcard = (unit < 0); 686 } 687 688 error = ifc_alloc_unit(ifc, &unit); 689 if (error != 0) 690 return (error); 691 692 /* In the wildcard case, we need to update the name. */ 693 if (wildcard) { 694 for (dp = name; *dp != '\0'; dp++); 695 if (snprintf(dp, len - (dp-name), "%d", unit) > 696 len - (dp-name) - 1) { 697 panic("%s: interface name too long", __func__); 698 } 699 } 700 701 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 702 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 703 if (ifp == NULL) { 704 ifc_free_unit(ifc, unit); 705 free(ifv, M_VLAN); 706 return (ENOSPC); 707 } 708 SLIST_INIT(&ifv->vlan_mc_listhead); 709 710 ifp->if_softc = ifv; 711 /* 712 * Set the name manually rather than using if_initname because 713 * we don't conform to the default naming convention for interfaces. 714 */ 715 strlcpy(ifp->if_xname, name, IFNAMSIZ); 716 ifp->if_dname = ifc->ifc_name; 717 ifp->if_dunit = unit; 718 /* NB: flags are not set here */ 719 ifp->if_linkmib = &ifv->ifv_mib; 720 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 721 /* NB: mtu is not set here */ 722 723 ifp->if_init = vlan_init; 724 ifp->if_start = vlan_start; 725 ifp->if_ioctl = vlan_ioctl; 726 ifp->if_snd.ifq_maxlen = ifqmaxlen; 727 ifp->if_flags = VLAN_IFFLAGS; 728 ether_ifattach(ifp, eaddr); 729 /* Now undo some of the damage... */ 730 ifp->if_baudrate = 0; 731 ifp->if_type = IFT_L2VLAN; 732 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 733 734 if (ethertag) { 735 error = vlan_config(ifv, p, tag); 736 if (error != 0) { 737 /* 738 * Since we've partialy failed, we need to back 739 * out all the way, otherwise userland could get 740 * confused. Thus, we destroy the interface. 741 */ 742 ether_ifdetach(ifp); 743 vlan_unconfig(ifp); 744 if_free_type(ifp, IFT_ETHER); 745 free(ifv, M_VLAN); 746 747 return (error); 748 } 749 750 /* Update flags on the parent, if necessary. */ 751 vlan_setflags(ifp, 1); 752 } 753 754 return (0); 755 } 756 757 static int 758 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 759 { 760 struct ifvlan *ifv = ifp->if_softc; 761 int unit = ifp->if_dunit; 762 763 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 764 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 765 if_free_type(ifp, IFT_ETHER); 766 free(ifv, M_VLAN); 767 ifc_free_unit(ifc, unit); 768 769 return (0); 770 } 771 772 /* 773 * The ifp->if_init entry point for vlan(4) is a no-op. 774 */ 775 static void 776 vlan_init(void *foo __unused) 777 { 778 } 779 780 /* 781 * The if_start method for vlan(4) interface. It doesn't 782 * raises the IFF_DRV_OACTIVE flag, since it is called 783 * only from IFQ_HANDOFF() macro in ether_output_frame(). 784 * If the interface queue is full, and vlan_start() is 785 * not called, the queue would never get emptied and 786 * interface would stall forever. 787 */ 788 static void 789 vlan_start(struct ifnet *ifp) 790 { 791 struct ifvlan *ifv; 792 struct ifnet *p; 793 struct mbuf *m; 794 int error; 795 796 ifv = ifp->if_softc; 797 p = PARENT(ifv); 798 799 for (;;) { 800 IF_DEQUEUE(&ifp->if_snd, m); 801 if (m == 0) 802 break; 803 BPF_MTAP(ifp, m); 804 805 /* 806 * Do not run parent's if_start() if the parent is not up, 807 * or parent's driver will cause a system crash. 808 */ 809 if (!((p->if_flags & IFF_UP) && 810 (p->if_drv_flags & IFF_DRV_RUNNING))) { 811 m_freem(m); 812 ifp->if_collisions++; 813 continue; 814 } 815 816 /* 817 * Pad the frame to the minimum size allowed if told to. 818 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 819 * paragraph C.4.4.3.b. It can help to work around buggy 820 * bridges that violate paragraph C.4.4.3.a from the same 821 * document, i.e., fail to pad short frames after untagging. 822 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 823 * untagging it will produce a 62-byte frame, which is a runt 824 * and requires padding. There are VLAN-enabled network 825 * devices that just discard such runts instead or mishandle 826 * them somehow. 827 */ 828 if (soft_pad) { 829 static char pad[8]; /* just zeros */ 830 int n; 831 832 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 833 n > 0; n -= sizeof(pad)) 834 if (!m_append(m, min(n, sizeof(pad)), pad)) 835 break; 836 837 if (n > 0) { 838 if_printf(ifp, "cannot pad short frame\n"); 839 ifp->if_oerrors++; 840 m_freem(m); 841 continue; 842 } 843 } 844 845 /* 846 * If underlying interface can do VLAN tag insertion itself, 847 * just pass the packet along. However, we need some way to 848 * tell the interface where the packet came from so that it 849 * knows how to find the VLAN tag to use, so we attach a 850 * packet tag that holds it. 851 */ 852 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 853 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 854 m->m_flags |= M_VLANTAG; 855 } else { 856 struct ether_vlan_header *evl; 857 858 M_PREPEND(m, ifv->ifv_encaplen, M_DONTWAIT); 859 if (m == NULL) { 860 if_printf(ifp, 861 "unable to prepend VLAN header\n"); 862 ifp->if_oerrors++; 863 continue; 864 } 865 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */ 866 867 if (m->m_len < sizeof(*evl)) { 868 m = m_pullup(m, sizeof(*evl)); 869 if (m == NULL) { 870 if_printf(ifp, 871 "cannot pullup VLAN header\n"); 872 ifp->if_oerrors++; 873 continue; 874 } 875 } 876 877 /* 878 * Transform the Ethernet header into an Ethernet header 879 * with 802.1Q encapsulation. 880 */ 881 bcopy(mtod(m, char *) + ifv->ifv_encaplen, 882 mtod(m, char *), ETHER_HDR_LEN); 883 evl = mtod(m, struct ether_vlan_header *); 884 evl->evl_proto = evl->evl_encap_proto; 885 evl->evl_encap_proto = htons(ifv->ifv_proto); 886 evl->evl_tag = htons(ifv->ifv_tag); 887 #ifdef DEBUG 888 printf("%s: %*D\n", __func__, (int)sizeof(*evl), 889 (unsigned char *)evl, ":"); 890 #endif 891 } 892 893 /* 894 * Send it, precisely as ether_output() would have. 895 * We are already running at splimp. 896 */ 897 IFQ_HANDOFF(p, m, error); 898 if (!error) 899 ifp->if_opackets++; 900 else 901 ifp->if_oerrors++; 902 } 903 } 904 905 static void 906 vlan_input(struct ifnet *ifp, struct mbuf *m) 907 { 908 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 909 struct ifvlan *ifv; 910 int inenc = 0; 911 uint16_t tag; 912 913 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 914 915 if (m->m_flags & M_VLANTAG) { 916 /* 917 * Packet is tagged, but m contains a normal 918 * Ethernet frame; the tag is stored out-of-band. 919 */ 920 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 921 m->m_flags &= ~M_VLANTAG; 922 } else { 923 struct ether_vlan_header *evl; 924 925 /* 926 * Packet is tagged in-band as specified by 802.1q. 927 */ 928 inenc = 1; 929 switch (ifp->if_type) { 930 case IFT_ETHER: 931 if (m->m_len < sizeof(*evl) && 932 (m = m_pullup(m, sizeof(*evl))) == NULL) { 933 if_printf(ifp, "cannot pullup VLAN header\n"); 934 return; 935 } 936 evl = mtod(m, struct ether_vlan_header *); 937 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 938 939 /* 940 * Restore the original ethertype. We'll remove 941 * the encapsulation after we've found the vlan 942 * interface corresponding to the tag. 943 */ 944 evl->evl_encap_proto = evl->evl_proto; 945 break; 946 default: 947 #ifdef INVARIANTS 948 panic("%s: %s has unsupported if_type %u", 949 __func__, ifp->if_xname, ifp->if_type); 950 #endif 951 m_freem(m); 952 ifp->if_noproto++; 953 return; 954 } 955 } 956 957 TRUNK_RLOCK(trunk); 958 #ifdef VLAN_ARRAY 959 ifv = trunk->vlans[tag]; 960 #else 961 ifv = vlan_gethash(trunk, tag); 962 #endif 963 if (ifv == NULL || (ifv->ifv_ifp->if_flags & IFF_UP) == 0) { 964 TRUNK_RUNLOCK(trunk); 965 m_freem(m); 966 ifp->if_noproto++; 967 return; 968 } 969 TRUNK_RUNLOCK(trunk); 970 971 if (inenc) { 972 /* 973 * Packet had an in-line encapsulation header; 974 * remove it. The original header has already 975 * been fixed up above. 976 */ 977 bcopy(mtod(m, caddr_t), 978 mtod(m, caddr_t) + ETHER_VLAN_ENCAP_LEN, 979 ETHER_HDR_LEN); 980 m_adj(m, ETHER_VLAN_ENCAP_LEN); 981 } 982 983 m->m_pkthdr.rcvif = ifv->ifv_ifp; 984 ifv->ifv_ifp->if_ipackets++; 985 986 /* Pass it back through the parent's input routine. */ 987 (*ifp->if_input)(ifv->ifv_ifp, m); 988 } 989 990 static int 991 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 992 { 993 struct ifvlantrunk *trunk; 994 struct ifnet *ifp; 995 int error = 0; 996 997 /* VID numbers 0x0 and 0xFFF are reserved */ 998 if (tag == 0 || tag == 0xFFF) 999 return (EINVAL); 1000 if (p->if_type != IFT_ETHER) 1001 return (EPROTONOSUPPORT); 1002 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1003 return (EPROTONOSUPPORT); 1004 if (ifv->ifv_trunk) 1005 return (EBUSY); 1006 1007 if (p->if_vlantrunk == NULL) { 1008 trunk = malloc(sizeof(struct ifvlantrunk), 1009 M_VLAN, M_WAITOK | M_ZERO); 1010 #ifndef VLAN_ARRAY 1011 vlan_inithash(trunk); 1012 #endif 1013 VLAN_LOCK(); 1014 if (p->if_vlantrunk != NULL) { 1015 /* A race that that is very unlikely to be hit. */ 1016 #ifndef VLAN_ARRAY 1017 vlan_freehash(trunk); 1018 #endif 1019 free(trunk, M_VLAN); 1020 goto exists; 1021 } 1022 TRUNK_LOCK_INIT(trunk); 1023 LIST_INSERT_HEAD(&trunk_list, trunk, trunk_entry); 1024 TRUNK_LOCK(trunk); 1025 p->if_vlantrunk = trunk; 1026 trunk->parent = p; 1027 } else { 1028 VLAN_LOCK(); 1029 exists: 1030 trunk = p->if_vlantrunk; 1031 TRUNK_LOCK(trunk); 1032 } 1033 1034 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1035 #ifdef VLAN_ARRAY 1036 if (trunk->vlans[tag] != NULL) { 1037 error = EEXIST; 1038 goto done; 1039 } 1040 trunk->vlans[tag] = ifv; 1041 trunk->refcnt++; 1042 #else 1043 error = vlan_inshash(trunk, ifv); 1044 if (error) 1045 goto done; 1046 #endif 1047 ifv->ifv_proto = ETHERTYPE_VLAN; 1048 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1049 ifv->ifv_mintu = ETHERMIN; 1050 ifv->ifv_pflags = 0; 1051 1052 /* 1053 * If the parent supports the VLAN_MTU capability, 1054 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1055 * use it. 1056 */ 1057 if (p->if_capenable & IFCAP_VLAN_MTU) { 1058 /* 1059 * No need to fudge the MTU since the parent can 1060 * handle extended frames. 1061 */ 1062 ifv->ifv_mtufudge = 0; 1063 } else { 1064 /* 1065 * Fudge the MTU by the encapsulation size. This 1066 * makes us incompatible with strictly compliant 1067 * 802.1Q implementations, but allows us to use 1068 * the feature with other NetBSD implementations, 1069 * which might still be useful. 1070 */ 1071 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1072 } 1073 1074 ifv->ifv_trunk = trunk; 1075 ifp = ifv->ifv_ifp; 1076 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1077 ifp->if_baudrate = p->if_baudrate; 1078 /* 1079 * Copy only a selected subset of flags from the parent. 1080 * Other flags are none of our business. 1081 */ 1082 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1083 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1084 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1085 #undef VLAN_COPY_FLAGS 1086 1087 ifp->if_link_state = p->if_link_state; 1088 1089 vlan_capabilities(ifv); 1090 1091 /* 1092 * Set up our ``Ethernet address'' to reflect the underlying 1093 * physical interface's. 1094 */ 1095 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1096 1097 /* 1098 * Configure multicast addresses that may already be 1099 * joined on the vlan device. 1100 */ 1101 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1102 1103 /* We are ready for operation now. */ 1104 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1105 done: 1106 TRUNK_UNLOCK(trunk); 1107 VLAN_UNLOCK(); 1108 1109 return (error); 1110 } 1111 1112 static int 1113 vlan_unconfig(struct ifnet *ifp) 1114 { 1115 int ret; 1116 1117 VLAN_LOCK(); 1118 ret = vlan_unconfig_locked(ifp); 1119 VLAN_UNLOCK(); 1120 return (ret); 1121 } 1122 1123 static int 1124 vlan_unconfig_locked(struct ifnet *ifp) 1125 { 1126 struct ifvlantrunk *trunk; 1127 struct vlan_mc_entry *mc; 1128 struct ifvlan *ifv; 1129 int error; 1130 1131 VLAN_LOCK_ASSERT(); 1132 1133 ifv = ifp->if_softc; 1134 trunk = ifv->ifv_trunk; 1135 1136 if (trunk) { 1137 struct sockaddr_dl sdl; 1138 struct ifnet *p = trunk->parent; 1139 1140 TRUNK_LOCK(trunk); 1141 1142 /* 1143 * Since the interface is being unconfigured, we need to 1144 * empty the list of multicast groups that we may have joined 1145 * while we were alive from the parent's list. 1146 */ 1147 bzero((char *)&sdl, sizeof(sdl)); 1148 sdl.sdl_len = sizeof(sdl); 1149 sdl.sdl_family = AF_LINK; 1150 sdl.sdl_index = p->if_index; 1151 sdl.sdl_type = IFT_ETHER; 1152 sdl.sdl_alen = ETHER_ADDR_LEN; 1153 1154 while(SLIST_FIRST(&ifv->vlan_mc_listhead) != NULL) { 1155 mc = SLIST_FIRST(&ifv->vlan_mc_listhead); 1156 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1157 ETHER_ADDR_LEN); 1158 error = if_delmulti(p, (struct sockaddr *)&sdl); 1159 if (error) 1160 return (error); 1161 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1162 free(mc, M_VLAN); 1163 } 1164 1165 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1166 #ifdef VLAN_ARRAY 1167 trunk->vlans[ifv->ifv_tag] = NULL; 1168 trunk->refcnt--; 1169 #else 1170 vlan_remhash(trunk, ifv); 1171 #endif 1172 ifv->ifv_trunk = NULL; 1173 1174 /* 1175 * Check if we were the last. 1176 */ 1177 if (trunk->refcnt == 0) { 1178 trunk->parent->if_vlantrunk = NULL; 1179 /* 1180 * XXXGL: If some ithread has already entered 1181 * vlan_input() and is now blocked on the trunk 1182 * lock, then it should preempt us right after 1183 * unlock and finish its work. Then we will acquire 1184 * lock again in trunk_destroy(). 1185 */ 1186 TRUNK_UNLOCK(trunk); 1187 trunk_destroy(trunk); 1188 } else 1189 TRUNK_UNLOCK(trunk); 1190 } 1191 1192 /* Disconnect from parent. */ 1193 if (ifv->ifv_pflags) 1194 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1195 ifp->if_mtu = ETHERMTU; 1196 ifp->if_link_state = LINK_STATE_UNKNOWN; 1197 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1198 1199 return (0); 1200 } 1201 1202 /* Handle a reference counted flag that should be set on the parent as well */ 1203 static int 1204 vlan_setflag(struct ifnet *ifp, int flag, int status, 1205 int (*func)(struct ifnet *, int)) 1206 { 1207 struct ifvlan *ifv; 1208 int error; 1209 1210 /* XXX VLAN_LOCK_ASSERT(); */ 1211 1212 ifv = ifp->if_softc; 1213 status = status ? (ifp->if_flags & flag) : 0; 1214 /* Now "status" contains the flag value or 0 */ 1215 1216 /* 1217 * See if recorded parent's status is different from what 1218 * we want it to be. If it is, flip it. We record parent's 1219 * status in ifv_pflags so that we won't clear parent's flag 1220 * we haven't set. In fact, we don't clear or set parent's 1221 * flags directly, but get or release references to them. 1222 * That's why we can be sure that recorded flags still are 1223 * in accord with actual parent's flags. 1224 */ 1225 if (status != (ifv->ifv_pflags & flag)) { 1226 error = (*func)(PARENT(ifv), status); 1227 if (error) 1228 return (error); 1229 ifv->ifv_pflags &= ~flag; 1230 ifv->ifv_pflags |= status; 1231 } 1232 return (0); 1233 } 1234 1235 /* 1236 * Handle IFF_* flags that require certain changes on the parent: 1237 * if "status" is true, update parent's flags respective to our if_flags; 1238 * if "status" is false, forcedly clear the flags set on parent. 1239 */ 1240 static int 1241 vlan_setflags(struct ifnet *ifp, int status) 1242 { 1243 int error, i; 1244 1245 for (i = 0; vlan_pflags[i].flag; i++) { 1246 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1247 status, vlan_pflags[i].func); 1248 if (error) 1249 return (error); 1250 } 1251 return (0); 1252 } 1253 1254 /* Inform all vlans that their parent has changed link state */ 1255 static void 1256 vlan_link_state(struct ifnet *ifp, int link) 1257 { 1258 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1259 struct ifvlan *ifv; 1260 int i; 1261 1262 TRUNK_LOCK(trunk); 1263 #ifdef VLAN_ARRAY 1264 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1265 if (trunk->vlans[i] != NULL) { 1266 ifv = trunk->vlans[i]; 1267 #else 1268 for (i = 0; i < (1 << trunk->hwidth); i++) 1269 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1270 #endif 1271 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1272 if_link_state_change(ifv->ifv_ifp, 1273 trunk->parent->if_link_state); 1274 } 1275 TRUNK_UNLOCK(trunk); 1276 } 1277 1278 static void 1279 vlan_capabilities(struct ifvlan *ifv) 1280 { 1281 struct ifnet *p = PARENT(ifv); 1282 struct ifnet *ifp = ifv->ifv_ifp; 1283 1284 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1285 1286 /* 1287 * If the parent interface can do checksum offloading 1288 * on VLANs, then propagate its hardware-assisted 1289 * checksumming flags. Also assert that checksum 1290 * offloading requires hardware VLAN tagging. 1291 */ 1292 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1293 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1294 1295 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1296 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1297 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1298 ifp->if_hwassist = p->if_hwassist; 1299 } else { 1300 ifp->if_capenable = 0; 1301 ifp->if_hwassist = 0; 1302 } 1303 } 1304 1305 static void 1306 vlan_trunk_capabilities(struct ifnet *ifp) 1307 { 1308 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1309 struct ifvlan *ifv; 1310 int i; 1311 1312 TRUNK_LOCK(trunk); 1313 #ifdef VLAN_ARRAY 1314 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1315 if (trunk->vlans[i] != NULL) { 1316 ifv = trunk->vlans[i]; 1317 #else 1318 for (i = 0; i < (1 << trunk->hwidth); i++) { 1319 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1320 #endif 1321 vlan_capabilities(ifv); 1322 } 1323 TRUNK_UNLOCK(trunk); 1324 } 1325 1326 static int 1327 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1328 { 1329 struct ifaddr *ifa; 1330 struct ifnet *p; 1331 struct ifreq *ifr; 1332 struct ifvlan *ifv; 1333 struct vlanreq vlr; 1334 int error = 0; 1335 1336 ifr = (struct ifreq *)data; 1337 ifa = (struct ifaddr *)data; 1338 ifv = ifp->if_softc; 1339 1340 switch (cmd) { 1341 case SIOCSIFADDR: 1342 ifp->if_flags |= IFF_UP; 1343 1344 switch (ifa->ifa_addr->sa_family) { 1345 #ifdef INET 1346 case AF_INET: 1347 arp_ifinit(ifv->ifv_ifp, ifa); 1348 break; 1349 #endif 1350 default: 1351 break; 1352 } 1353 break; 1354 1355 case SIOCGIFADDR: 1356 { 1357 struct sockaddr *sa; 1358 1359 sa = (struct sockaddr *) &ifr->ifr_data; 1360 bcopy(IF_LLADDR(ifp), (caddr_t)sa->sa_data, 1361 ETHER_ADDR_LEN); 1362 } 1363 break; 1364 1365 case SIOCGIFMEDIA: 1366 VLAN_LOCK(); 1367 if (TRUNK(ifv) != NULL) { 1368 error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv), 1369 SIOCGIFMEDIA, data); 1370 VLAN_UNLOCK(); 1371 /* Limit the result to the parent's current config. */ 1372 if (error == 0) { 1373 struct ifmediareq *ifmr; 1374 1375 ifmr = (struct ifmediareq *)data; 1376 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1377 ifmr->ifm_count = 1; 1378 error = copyout(&ifmr->ifm_current, 1379 ifmr->ifm_ulist, 1380 sizeof(int)); 1381 } 1382 } 1383 } else { 1384 VLAN_UNLOCK(); 1385 error = EINVAL; 1386 } 1387 break; 1388 1389 case SIOCSIFMEDIA: 1390 error = EINVAL; 1391 break; 1392 1393 case SIOCSIFMTU: 1394 /* 1395 * Set the interface MTU. 1396 */ 1397 VLAN_LOCK(); 1398 if (TRUNK(ifv) != NULL) { 1399 if (ifr->ifr_mtu > 1400 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1401 ifr->ifr_mtu < 1402 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1403 error = EINVAL; 1404 else 1405 ifp->if_mtu = ifr->ifr_mtu; 1406 } else 1407 error = EINVAL; 1408 VLAN_UNLOCK(); 1409 break; 1410 1411 case SIOCSETVLAN: 1412 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1413 if (error) 1414 break; 1415 if (vlr.vlr_parent[0] == '\0') { 1416 vlan_unconfig(ifp); 1417 break; 1418 } 1419 p = ifunit(vlr.vlr_parent); 1420 if (p == 0) { 1421 error = ENOENT; 1422 break; 1423 } 1424 /* 1425 * Don't let the caller set up a VLAN tag with 1426 * anything except VLID bits. 1427 */ 1428 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1429 error = EINVAL; 1430 break; 1431 } 1432 error = vlan_config(ifv, p, vlr.vlr_tag); 1433 if (error) 1434 break; 1435 1436 /* Update flags on the parent, if necessary. */ 1437 vlan_setflags(ifp, 1); 1438 break; 1439 1440 case SIOCGETVLAN: 1441 bzero(&vlr, sizeof(vlr)); 1442 VLAN_LOCK(); 1443 if (TRUNK(ifv) != NULL) { 1444 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1445 sizeof(vlr.vlr_parent)); 1446 vlr.vlr_tag = ifv->ifv_tag; 1447 } 1448 VLAN_UNLOCK(); 1449 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1450 break; 1451 1452 case SIOCSIFFLAGS: 1453 /* 1454 * We should propagate selected flags to the parent, 1455 * e.g., promiscuous mode. 1456 */ 1457 if (TRUNK(ifv) != NULL) 1458 error = vlan_setflags(ifp, 1); 1459 break; 1460 1461 case SIOCADDMULTI: 1462 case SIOCDELMULTI: 1463 /* 1464 * If we don't have a parent, just remember the membership for 1465 * when we do. 1466 */ 1467 if (TRUNK(ifv) != NULL) 1468 error = vlan_setmulti(ifp); 1469 break; 1470 1471 default: 1472 error = EINVAL; 1473 } 1474 1475 return (error); 1476 } 1477