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sys/net/if_vlan.c
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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: releng/8.1/sys/net/if_vlan.c 208526 2010-05-25 02:36:06Z thompsa $"); 44 45 #include "opt_vlan.h" 46 47 #include <sys/param.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/module.h> 53 #include <sys/rwlock.h> 54 #include <sys/queue.h> 55 #include <sys/socket.h> 56 #include <sys/sockio.h> 57 #include <sys/sysctl.h> 58 #include <sys/systm.h> 59 60 #include <net/bpf.h> 61 #include <net/ethernet.h> 62 #include <net/if.h> 63 #include <net/if_clone.h> 64 #include <net/if_dl.h> 65 #include <net/if_types.h> 66 #include <net/if_vlan_var.h> 67 #include <net/vnet.h> 68 69 #define VLANNAME "vlan" 70 #define VLAN_DEF_HWIDTH 4 71 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 72 73 #define UP_AND_RUNNING(ifp) \ 74 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 75 76 LIST_HEAD(ifvlanhead, ifvlan); 77 78 struct ifvlantrunk { 79 struct ifnet *parent; /* parent interface of this trunk */ 80 struct rwlock rw; 81 #ifdef VLAN_ARRAY 82 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 83 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 84 #else 85 struct ifvlanhead *hash; /* dynamic hash-list table */ 86 uint16_t hmask; 87 uint16_t hwidth; 88 #endif 89 int refcnt; 90 }; 91 92 struct vlan_mc_entry { 93 struct ether_addr mc_addr; 94 SLIST_ENTRY(vlan_mc_entry) mc_entries; 95 }; 96 97 struct ifvlan { 98 struct ifvlantrunk *ifv_trunk; 99 struct ifnet *ifv_ifp; 100 #define TRUNK(ifv) ((ifv)->ifv_trunk) 101 #define PARENT(ifv) ((ifv)->ifv_trunk->parent) 102 int ifv_pflags; /* special flags we have set on parent */ 103 struct ifv_linkmib { 104 int ifvm_encaplen; /* encapsulation length */ 105 int ifvm_mtufudge; /* MTU fudged by this much */ 106 int ifvm_mintu; /* min transmission unit */ 107 uint16_t ifvm_proto; /* encapsulation ethertype */ 108 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 109 } ifv_mib; 110 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 111 #ifndef VLAN_ARRAY 112 LIST_ENTRY(ifvlan) ifv_list; 113 #endif 114 }; 115 #define ifv_proto ifv_mib.ifvm_proto 116 #define ifv_tag ifv_mib.ifvm_tag 117 #define ifv_encaplen ifv_mib.ifvm_encaplen 118 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 119 #define ifv_mintu ifv_mib.ifvm_mintu 120 121 /* Special flags we should propagate to parent. */ 122 static struct { 123 int flag; 124 int (*func)(struct ifnet *, int); 125 } vlan_pflags[] = { 126 {IFF_PROMISC, ifpromisc}, 127 {IFF_ALLMULTI, if_allmulti}, 128 {0, NULL} 129 }; 130 131 SYSCTL_DECL(_net_link); 132 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 133 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 134 135 static int soft_pad = 0; 136 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 137 "pad short frames before tagging"); 138 139 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 140 141 static eventhandler_tag ifdetach_tag; 142 static eventhandler_tag iflladdr_tag; 143 144 /* 145 * We have a global mutex, that is used to serialize configuration 146 * changes and isn't used in normal packet delivery. 147 * 148 * We also have a per-trunk rwlock, that is locked shared on packet 149 * processing and exclusive when configuration is changed. 150 * 151 * The VLAN_ARRAY substitutes the dynamic hash with a static array 152 * with 4096 entries. In theory this can give a boost in processing, 153 * however on practice it does not. Probably this is because array 154 * is too big to fit into CPU cache. 155 */ 156 static struct mtx ifv_mtx; 157 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 158 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 159 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 160 #define VLAN_LOCK() mtx_lock(&ifv_mtx) 161 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 162 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 163 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 164 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 165 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 166 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 167 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 168 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 169 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 170 171 #ifndef VLAN_ARRAY 172 static void vlan_inithash(struct ifvlantrunk *trunk); 173 static void vlan_freehash(struct ifvlantrunk *trunk); 174 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 175 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 176 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 177 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 178 uint16_t tag); 179 #endif 180 static void trunk_destroy(struct ifvlantrunk *trunk); 181 182 static void vlan_start(struct ifnet *ifp); 183 static void vlan_init(void *foo); 184 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 185 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 186 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 187 int (*func)(struct ifnet *, int)); 188 static int vlan_setflags(struct ifnet *ifp, int status); 189 static int vlan_setmulti(struct ifnet *ifp); 190 static void vlan_unconfig(struct ifnet *ifp); 191 static void vlan_unconfig_locked(struct ifnet *ifp); 192 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 193 static void vlan_link_state(struct ifnet *ifp, int link); 194 static void vlan_capabilities(struct ifvlan *ifv); 195 static void vlan_trunk_capabilities(struct ifnet *ifp); 196 197 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 198 const char *, int *); 199 static int vlan_clone_match(struct if_clone *, const char *); 200 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 201 static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 202 203 static void vlan_ifdetach(void *arg, struct ifnet *ifp); 204 static void vlan_iflladdr(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 struct ifvlan *ifv; 311 struct ifvlanhead *hash2; 312 int hwidth2, i, j, n, n2; 313 314 TRUNK_LOCK_ASSERT(trunk); 315 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 316 317 if (howmuch == 0) { 318 /* Harmless yet obvious coding error */ 319 printf("%s: howmuch is 0\n", __func__); 320 return; 321 } 322 323 hwidth2 = trunk->hwidth + howmuch; 324 n = 1 << trunk->hwidth; 325 n2 = 1 << hwidth2; 326 /* Do not shrink the table below the default */ 327 if (hwidth2 < VLAN_DEF_HWIDTH) 328 return; 329 330 /* M_NOWAIT because we're called with trunk mutex held */ 331 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 332 if (hash2 == NULL) { 333 printf("%s: out of memory -- hash size not changed\n", 334 __func__); 335 return; /* We can live with the old hash table */ 336 } 337 for (j = 0; j < n2; j++) 338 LIST_INIT(&hash2[j]); 339 for (i = 0; i < n; i++) 340 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 341 LIST_REMOVE(ifv, ifv_list); 342 j = HASH(ifv->ifv_tag, n2 - 1); 343 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 344 } 345 free(trunk->hash, M_VLAN); 346 trunk->hash = hash2; 347 trunk->hwidth = hwidth2; 348 trunk->hmask = n2 - 1; 349 350 if (bootverbose) 351 if_printf(trunk->parent, 352 "VLAN hash table resized from %d to %d buckets\n", n, n2); 353 } 354 355 static __inline struct ifvlan * 356 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 357 { 358 struct ifvlan *ifv; 359 360 TRUNK_LOCK_RASSERT(trunk); 361 362 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 363 if (ifv->ifv_tag == tag) 364 return (ifv); 365 return (NULL); 366 } 367 368 #if 0 369 /* Debugging code to view the hashtables. */ 370 static void 371 vlan_dumphash(struct ifvlantrunk *trunk) 372 { 373 int i; 374 struct ifvlan *ifv; 375 376 for (i = 0; i < (1 << trunk->hwidth); i++) { 377 printf("%d: ", i); 378 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 379 printf("%s ", ifv->ifv_ifp->if_xname); 380 printf("\n"); 381 } 382 } 383 #endif /* 0 */ 384 #endif /* !VLAN_ARRAY */ 385 386 static void 387 trunk_destroy(struct ifvlantrunk *trunk) 388 { 389 VLAN_LOCK_ASSERT(); 390 391 TRUNK_LOCK(trunk); 392 #ifndef VLAN_ARRAY 393 vlan_freehash(trunk); 394 #endif 395 trunk->parent->if_vlantrunk = NULL; 396 TRUNK_UNLOCK(trunk); 397 TRUNK_LOCK_DESTROY(trunk); 398 free(trunk, M_VLAN); 399 } 400 401 /* 402 * Program our multicast filter. What we're actually doing is 403 * programming the multicast filter of the parent. This has the 404 * side effect of causing the parent interface to receive multicast 405 * traffic that it doesn't really want, which ends up being discarded 406 * later by the upper protocol layers. Unfortunately, there's no way 407 * to avoid this: there really is only one physical interface. 408 * 409 * XXX: There is a possible race here if more than one thread is 410 * modifying the multicast state of the vlan interface at the same time. 411 */ 412 static int 413 vlan_setmulti(struct ifnet *ifp) 414 { 415 struct ifnet *ifp_p; 416 struct ifmultiaddr *ifma, *rifma = NULL; 417 struct ifvlan *sc; 418 struct vlan_mc_entry *mc; 419 struct sockaddr_dl sdl; 420 int error; 421 422 /*VLAN_LOCK_ASSERT();*/ 423 424 /* Find the parent. */ 425 sc = ifp->if_softc; 426 ifp_p = PARENT(sc); 427 428 CURVNET_SET_QUIET(ifp_p->if_vnet); 429 430 bzero((char *)&sdl, sizeof(sdl)); 431 sdl.sdl_len = sizeof(sdl); 432 sdl.sdl_family = AF_LINK; 433 sdl.sdl_index = ifp_p->if_index; 434 sdl.sdl_type = IFT_ETHER; 435 sdl.sdl_alen = ETHER_ADDR_LEN; 436 437 /* First, remove any existing filter entries. */ 438 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 439 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 440 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 441 if (error) 442 return (error); 443 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 444 free(mc, M_VLAN); 445 } 446 447 /* Now program new ones. */ 448 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 449 if (ifma->ifma_addr->sa_family != AF_LINK) 450 continue; 451 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 452 if (mc == NULL) 453 return (ENOMEM); 454 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 455 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 456 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 457 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 458 LLADDR(&sdl), ETHER_ADDR_LEN); 459 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 460 if (error) 461 return (error); 462 } 463 464 CURVNET_RESTORE(); 465 return (0); 466 } 467 468 /* 469 * A handler for parent interface link layer address changes. 470 * If the parent interface link layer address is changed we 471 * should also change it on all children vlans. 472 */ 473 static void 474 vlan_iflladdr(void *arg __unused, struct ifnet *ifp) 475 { 476 struct ifvlan *ifv; 477 #ifndef VLAN_ARRAY 478 struct ifvlan *next; 479 #endif 480 int i; 481 482 /* 483 * Check if it's a trunk interface first of all 484 * to avoid needless locking. 485 */ 486 if (ifp->if_vlantrunk == NULL) 487 return; 488 489 VLAN_LOCK(); 490 /* 491 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it. 492 */ 493 #ifdef VLAN_ARRAY 494 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 495 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 496 #else /* VLAN_ARRAY */ 497 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 498 LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) { 499 #endif /* VLAN_ARRAY */ 500 VLAN_UNLOCK(); 501 if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), ETHER_ADDR_LEN); 502 VLAN_LOCK(); 503 } 504 VLAN_UNLOCK(); 505 506 } 507 508 /* 509 * A handler for network interface departure events. 510 * Track departure of trunks here so that we don't access invalid 511 * pointers or whatever if a trunk is ripped from under us, e.g., 512 * by ejecting its hot-plug card. However, if an ifnet is simply 513 * being renamed, then there's no need to tear down the state. 514 */ 515 static void 516 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 517 { 518 struct ifvlan *ifv; 519 int i; 520 521 /* 522 * Check if it's a trunk interface first of all 523 * to avoid needless locking. 524 */ 525 if (ifp->if_vlantrunk == NULL) 526 return; 527 528 /* If the ifnet is just being renamed, don't do anything. */ 529 if (ifp->if_flags & IFF_RENAMING) 530 return; 531 532 VLAN_LOCK(); 533 /* 534 * OK, it's a trunk. Loop over and detach all vlan's on it. 535 * Check trunk pointer after each vlan_unconfig() as it will 536 * free it and set to NULL after the last vlan was detached. 537 */ 538 #ifdef VLAN_ARRAY 539 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 540 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 541 vlan_unconfig_locked(ifv->ifv_ifp); 542 if (ifp->if_vlantrunk == NULL) 543 break; 544 } 545 #else /* VLAN_ARRAY */ 546 restart: 547 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 548 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 549 vlan_unconfig_locked(ifv->ifv_ifp); 550 if (ifp->if_vlantrunk) 551 goto restart; /* trunk->hwidth can change */ 552 else 553 break; 554 } 555 #endif /* VLAN_ARRAY */ 556 /* Trunk should have been destroyed in vlan_unconfig(). */ 557 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 558 VLAN_UNLOCK(); 559 } 560 561 /* 562 * VLAN support can be loaded as a module. The only place in the 563 * system that's intimately aware of this is ether_input. We hook 564 * into this code through vlan_input_p which is defined there and 565 * set here. Noone else in the system should be aware of this so 566 * we use an explicit reference here. 567 */ 568 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 569 570 /* For if_link_state_change() eyes only... */ 571 extern void (*vlan_link_state_p)(struct ifnet *, int); 572 573 static int 574 vlan_modevent(module_t mod, int type, void *data) 575 { 576 577 switch (type) { 578 case MOD_LOAD: 579 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 580 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 581 if (ifdetach_tag == NULL) 582 return (ENOMEM); 583 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 584 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 585 if (iflladdr_tag == NULL) 586 return (ENOMEM); 587 VLAN_LOCK_INIT(); 588 vlan_input_p = vlan_input; 589 vlan_link_state_p = vlan_link_state; 590 vlan_trunk_cap_p = vlan_trunk_capabilities; 591 if_clone_attach(&vlan_cloner); 592 if (bootverbose) 593 printf("vlan: initialized, using " 594 #ifdef VLAN_ARRAY 595 "full-size arrays" 596 #else 597 "hash tables with chaining" 598 #endif 599 600 "\n"); 601 break; 602 case MOD_UNLOAD: 603 if_clone_detach(&vlan_cloner); 604 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 605 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag); 606 vlan_input_p = NULL; 607 vlan_link_state_p = NULL; 608 vlan_trunk_cap_p = NULL; 609 VLAN_LOCK_DESTROY(); 610 if (bootverbose) 611 printf("vlan: unloaded\n"); 612 break; 613 default: 614 return (EOPNOTSUPP); 615 } 616 return (0); 617 } 618 619 static moduledata_t vlan_mod = { 620 "if_vlan", 621 vlan_modevent, 622 0 623 }; 624 625 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 626 MODULE_VERSION(if_vlan, 3); 627 628 static struct ifnet * 629 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 630 { 631 const char *cp; 632 struct ifnet *ifp; 633 int t; 634 635 /* Check for <etherif>.<vlan> style interface names. */ 636 IFNET_RLOCK_NOSLEEP(); 637 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 638 if (ifp->if_type != IFT_ETHER) 639 continue; 640 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 641 continue; 642 cp = name + strlen(ifp->if_xname); 643 if (*cp++ != '.') 644 continue; 645 if (*cp == '\0') 646 continue; 647 t = 0; 648 for(; *cp >= '' && *cp <= '9'; cp++) 649 t = (t * 10) + (*cp - ''); 650 if (*cp != '\0') 651 continue; 652 if (tag != NULL) 653 *tag = t; 654 break; 655 } 656 IFNET_RUNLOCK_NOSLEEP(); 657 658 return (ifp); 659 } 660 661 static int 662 vlan_clone_match(struct if_clone *ifc, const char *name) 663 { 664 const char *cp; 665 666 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 667 return (1); 668 669 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 670 return (0); 671 for (cp = name + 4; *cp != '\0'; cp++) { 672 if (*cp < '' || *cp > '9') 673 return (0); 674 } 675 676 return (1); 677 } 678 679 static int 680 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 681 { 682 char *dp; 683 int wildcard; 684 int unit; 685 int error; 686 int tag; 687 int ethertag; 688 struct ifvlan *ifv; 689 struct ifnet *ifp; 690 struct ifnet *p; 691 struct vlanreq vlr; 692 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 693 694 /* 695 * There are 3 (ugh) ways to specify the cloned device: 696 * o pass a parameter block with the clone request. 697 * o specify parameters in the text of the clone device name 698 * o specify no parameters and get an unattached device that 699 * must be configured separately. 700 * The first technique is preferred; the latter two are 701 * supported for backwards compatibilty. 702 */ 703 if (params) { 704 error = copyin(params, &vlr, sizeof(vlr)); 705 if (error) 706 return error; 707 p = ifunit(vlr.vlr_parent); 708 if (p == NULL) 709 return ENXIO; 710 /* 711 * Don't let the caller set up a VLAN tag with 712 * anything except VLID bits. 713 */ 714 if (vlr.vlr_tag & ~EVL_VLID_MASK) 715 return (EINVAL); 716 error = ifc_name2unit(name, &unit); 717 if (error != 0) 718 return (error); 719 720 ethertag = 1; 721 tag = vlr.vlr_tag; 722 wildcard = (unit < 0); 723 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 724 ethertag = 1; 725 unit = -1; 726 wildcard = 0; 727 728 /* 729 * Don't let the caller set up a VLAN tag with 730 * anything except VLID bits. 731 */ 732 if (tag & ~EVL_VLID_MASK) 733 return (EINVAL); 734 } else { 735 ethertag = 0; 736 737 error = ifc_name2unit(name, &unit); 738 if (error != 0) 739 return (error); 740 741 wildcard = (unit < 0); 742 } 743 744 error = ifc_alloc_unit(ifc, &unit); 745 if (error != 0) 746 return (error); 747 748 /* In the wildcard case, we need to update the name. */ 749 if (wildcard) { 750 for (dp = name; *dp != '\0'; dp++); 751 if (snprintf(dp, len - (dp-name), "%d", unit) > 752 len - (dp-name) - 1) { 753 panic("%s: interface name too long", __func__); 754 } 755 } 756 757 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 758 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 759 if (ifp == NULL) { 760 ifc_free_unit(ifc, unit); 761 free(ifv, M_VLAN); 762 return (ENOSPC); 763 } 764 SLIST_INIT(&ifv->vlan_mc_listhead); 765 766 ifp->if_softc = ifv; 767 /* 768 * Set the name manually rather than using if_initname because 769 * we don't conform to the default naming convention for interfaces. 770 */ 771 strlcpy(ifp->if_xname, name, IFNAMSIZ); 772 ifp->if_dname = ifc->ifc_name; 773 ifp->if_dunit = unit; 774 /* NB: flags are not set here */ 775 ifp->if_linkmib = &ifv->ifv_mib; 776 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 777 /* NB: mtu is not set here */ 778 779 ifp->if_init = vlan_init; 780 ifp->if_start = vlan_start; 781 ifp->if_ioctl = vlan_ioctl; 782 ifp->if_snd.ifq_maxlen = ifqmaxlen; 783 ifp->if_flags = VLAN_IFFLAGS; 784 ether_ifattach(ifp, eaddr); 785 /* Now undo some of the damage... */ 786 ifp->if_baudrate = 0; 787 ifp->if_type = IFT_L2VLAN; 788 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 789 790 if (ethertag) { 791 error = vlan_config(ifv, p, tag); 792 if (error != 0) { 793 /* 794 * Since we've partialy failed, we need to back 795 * out all the way, otherwise userland could get 796 * confused. Thus, we destroy the interface. 797 */ 798 ether_ifdetach(ifp); 799 vlan_unconfig(ifp); 800 if_free_type(ifp, IFT_ETHER); 801 ifc_free_unit(ifc, unit); 802 free(ifv, M_VLAN); 803 804 return (error); 805 } 806 807 /* Update flags on the parent, if necessary. */ 808 vlan_setflags(ifp, 1); 809 } 810 811 return (0); 812 } 813 814 static int 815 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 816 { 817 struct ifvlan *ifv = ifp->if_softc; 818 int unit = ifp->if_dunit; 819 820 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 821 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 822 if_free_type(ifp, IFT_ETHER); 823 free(ifv, M_VLAN); 824 ifc_free_unit(ifc, unit); 825 826 return (0); 827 } 828 829 /* 830 * The ifp->if_init entry point for vlan(4) is a no-op. 831 */ 832 static void 833 vlan_init(void *foo __unused) 834 { 835 } 836 837 /* 838 * The if_start method for vlan(4) interface. It doesn't 839 * raises the IFF_DRV_OACTIVE flag, since it is called 840 * only from IFQ_HANDOFF() macro in ether_output_frame(). 841 * If the interface queue is full, and vlan_start() is 842 * not called, the queue would never get emptied and 843 * interface would stall forever. 844 */ 845 static void 846 vlan_start(struct ifnet *ifp) 847 { 848 struct ifvlan *ifv; 849 struct ifnet *p; 850 struct mbuf *m; 851 int error; 852 853 ifv = ifp->if_softc; 854 p = PARENT(ifv); 855 856 for (;;) { 857 IF_DEQUEUE(&ifp->if_snd, m); 858 if (m == NULL) 859 break; 860 BPF_MTAP(ifp, m); 861 862 /* 863 * Do not run parent's if_start() if the parent is not up, 864 * or parent's driver will cause a system crash. 865 */ 866 if (!UP_AND_RUNNING(p)) { 867 m_freem(m); 868 ifp->if_collisions++; 869 continue; 870 } 871 872 /* 873 * Pad the frame to the minimum size allowed if told to. 874 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 875 * paragraph C.4.4.3.b. It can help to work around buggy 876 * bridges that violate paragraph C.4.4.3.a from the same 877 * document, i.e., fail to pad short frames after untagging. 878 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 879 * untagging it will produce a 62-byte frame, which is a runt 880 * and requires padding. There are VLAN-enabled network 881 * devices that just discard such runts instead or mishandle 882 * them somehow. 883 */ 884 if (soft_pad) { 885 static char pad[8]; /* just zeros */ 886 int n; 887 888 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 889 n > 0; n -= sizeof(pad)) 890 if (!m_append(m, min(n, sizeof(pad)), pad)) 891 break; 892 893 if (n > 0) { 894 if_printf(ifp, "cannot pad short frame\n"); 895 ifp->if_oerrors++; 896 m_freem(m); 897 continue; 898 } 899 } 900 901 /* 902 * If underlying interface can do VLAN tag insertion itself, 903 * just pass the packet along. However, we need some way to 904 * tell the interface where the packet came from so that it 905 * knows how to find the VLAN tag to use, so we attach a 906 * packet tag that holds it. 907 */ 908 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 909 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 910 m->m_flags |= M_VLANTAG; 911 } else { 912 m = ether_vlanencap(m, ifv->ifv_tag); 913 if (m == NULL) { 914 if_printf(ifp, 915 "unable to prepend VLAN header\n"); 916 ifp->if_oerrors++; 917 continue; 918 } 919 } 920 921 /* 922 * Send it, precisely as ether_output() would have. 923 * We are already running at splimp. 924 */ 925 error = (p->if_transmit)(p, m); 926 if (!error) 927 ifp->if_opackets++; 928 else 929 ifp->if_oerrors++; 930 } 931 } 932 933 static void 934 vlan_input(struct ifnet *ifp, struct mbuf *m) 935 { 936 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 937 struct ifvlan *ifv; 938 uint16_t tag; 939 940 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 941 942 if (m->m_flags & M_VLANTAG) { 943 /* 944 * Packet is tagged, but m contains a normal 945 * Ethernet frame; the tag is stored out-of-band. 946 */ 947 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 948 m->m_flags &= ~M_VLANTAG; 949 } else { 950 struct ether_vlan_header *evl; 951 952 /* 953 * Packet is tagged in-band as specified by 802.1q. 954 */ 955 switch (ifp->if_type) { 956 case IFT_ETHER: 957 if (m->m_len < sizeof(*evl) && 958 (m = m_pullup(m, sizeof(*evl))) == NULL) { 959 if_printf(ifp, "cannot pullup VLAN header\n"); 960 return; 961 } 962 evl = mtod(m, struct ether_vlan_header *); 963 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 964 965 /* 966 * Remove the 802.1q header by copying the Ethernet 967 * addresses over it and adjusting the beginning of 968 * the data in the mbuf. The encapsulated Ethernet 969 * type field is already in place. 970 */ 971 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 972 ETHER_HDR_LEN - ETHER_TYPE_LEN); 973 m_adj(m, ETHER_VLAN_ENCAP_LEN); 974 break; 975 976 default: 977 #ifdef INVARIANTS 978 panic("%s: %s has unsupported if_type %u", 979 __func__, ifp->if_xname, ifp->if_type); 980 #endif 981 m_freem(m); 982 ifp->if_noproto++; 983 return; 984 } 985 } 986 987 TRUNK_RLOCK(trunk); 988 #ifdef VLAN_ARRAY 989 ifv = trunk->vlans[tag]; 990 #else 991 ifv = vlan_gethash(trunk, tag); 992 #endif 993 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 994 TRUNK_RUNLOCK(trunk); 995 m_freem(m); 996 ifp->if_noproto++; 997 return; 998 } 999 TRUNK_RUNLOCK(trunk); 1000 1001 m->m_pkthdr.rcvif = ifv->ifv_ifp; 1002 ifv->ifv_ifp->if_ipackets++; 1003 1004 /* Pass it back through the parent's input routine. */ 1005 (*ifp->if_input)(ifv->ifv_ifp, m); 1006 } 1007 1008 static int 1009 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 1010 { 1011 struct ifvlantrunk *trunk; 1012 struct ifnet *ifp; 1013 int error = 0; 1014 1015 /* VID numbers 0x0 and 0xFFF are reserved */ 1016 if (tag == 0 || tag == 0xFFF) 1017 return (EINVAL); 1018 if (p->if_type != IFT_ETHER) 1019 return (EPROTONOSUPPORT); 1020 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1021 return (EPROTONOSUPPORT); 1022 if (ifv->ifv_trunk) 1023 return (EBUSY); 1024 1025 if (p->if_vlantrunk == NULL) { 1026 trunk = malloc(sizeof(struct ifvlantrunk), 1027 M_VLAN, M_WAITOK | M_ZERO); 1028 #ifndef VLAN_ARRAY 1029 vlan_inithash(trunk); 1030 #endif 1031 VLAN_LOCK(); 1032 if (p->if_vlantrunk != NULL) { 1033 /* A race that that is very unlikely to be hit. */ 1034 #ifndef VLAN_ARRAY 1035 vlan_freehash(trunk); 1036 #endif 1037 free(trunk, M_VLAN); 1038 goto exists; 1039 } 1040 TRUNK_LOCK_INIT(trunk); 1041 TRUNK_LOCK(trunk); 1042 p->if_vlantrunk = trunk; 1043 trunk->parent = p; 1044 } else { 1045 VLAN_LOCK(); 1046 exists: 1047 trunk = p->if_vlantrunk; 1048 TRUNK_LOCK(trunk); 1049 } 1050 1051 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1052 #ifdef VLAN_ARRAY 1053 if (trunk->vlans[tag] != NULL) { 1054 error = EEXIST; 1055 goto done; 1056 } 1057 trunk->vlans[tag] = ifv; 1058 trunk->refcnt++; 1059 #else 1060 error = vlan_inshash(trunk, ifv); 1061 if (error) 1062 goto done; 1063 #endif 1064 ifv->ifv_proto = ETHERTYPE_VLAN; 1065 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1066 ifv->ifv_mintu = ETHERMIN; 1067 ifv->ifv_pflags = 0; 1068 1069 /* 1070 * If the parent supports the VLAN_MTU capability, 1071 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1072 * use it. 1073 */ 1074 if (p->if_capenable & IFCAP_VLAN_MTU) { 1075 /* 1076 * No need to fudge the MTU since the parent can 1077 * handle extended frames. 1078 */ 1079 ifv->ifv_mtufudge = 0; 1080 } else { 1081 /* 1082 * Fudge the MTU by the encapsulation size. This 1083 * makes us incompatible with strictly compliant 1084 * 802.1Q implementations, but allows us to use 1085 * the feature with other NetBSD implementations, 1086 * which might still be useful. 1087 */ 1088 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1089 } 1090 1091 ifv->ifv_trunk = trunk; 1092 ifp = ifv->ifv_ifp; 1093 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1094 ifp->if_baudrate = p->if_baudrate; 1095 /* 1096 * Copy only a selected subset of flags from the parent. 1097 * Other flags are none of our business. 1098 */ 1099 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1100 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1101 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1102 #undef VLAN_COPY_FLAGS 1103 1104 ifp->if_link_state = p->if_link_state; 1105 1106 vlan_capabilities(ifv); 1107 1108 /* 1109 * Set up our ``Ethernet address'' to reflect the underlying 1110 * physical interface's. 1111 */ 1112 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1113 1114 /* 1115 * Configure multicast addresses that may already be 1116 * joined on the vlan device. 1117 */ 1118 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1119 1120 /* We are ready for operation now. */ 1121 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1122 done: 1123 TRUNK_UNLOCK(trunk); 1124 if (error == 0) 1125 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1126 VLAN_UNLOCK(); 1127 1128 return (error); 1129 } 1130 1131 static void 1132 vlan_unconfig(struct ifnet *ifp) 1133 { 1134 1135 VLAN_LOCK(); 1136 vlan_unconfig_locked(ifp); 1137 VLAN_UNLOCK(); 1138 } 1139 1140 static void 1141 vlan_unconfig_locked(struct ifnet *ifp) 1142 { 1143 struct ifvlantrunk *trunk; 1144 struct vlan_mc_entry *mc; 1145 struct ifvlan *ifv; 1146 struct ifnet *parent; 1147 1148 VLAN_LOCK_ASSERT(); 1149 1150 ifv = ifp->if_softc; 1151 trunk = ifv->ifv_trunk; 1152 parent = NULL; 1153 1154 if (trunk != NULL) { 1155 struct sockaddr_dl sdl; 1156 1157 TRUNK_LOCK(trunk); 1158 parent = trunk->parent; 1159 1160 /* 1161 * Since the interface is being unconfigured, we need to 1162 * empty the list of multicast groups that we may have joined 1163 * while we were alive from the parent's list. 1164 */ 1165 bzero((char *)&sdl, sizeof(sdl)); 1166 sdl.sdl_len = sizeof(sdl); 1167 sdl.sdl_family = AF_LINK; 1168 sdl.sdl_index = parent->if_index; 1169 sdl.sdl_type = IFT_ETHER; 1170 sdl.sdl_alen = ETHER_ADDR_LEN; 1171 1172 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1173 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1174 ETHER_ADDR_LEN); 1175 1176 /* 1177 * This may fail if the parent interface is 1178 * being detached. Regardless, we should do a 1179 * best effort to free this interface as much 1180 * as possible as all callers expect vlan 1181 * destruction to succeed. 1182 */ 1183 (void)if_delmulti(parent, (struct sockaddr *)&sdl); 1184 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1185 free(mc, M_VLAN); 1186 } 1187 1188 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1189 #ifdef VLAN_ARRAY 1190 trunk->vlans[ifv->ifv_tag] = NULL; 1191 trunk->refcnt--; 1192 #else 1193 vlan_remhash(trunk, ifv); 1194 #endif 1195 ifv->ifv_trunk = NULL; 1196 1197 /* 1198 * Check if we were the last. 1199 */ 1200 if (trunk->refcnt == 0) { 1201 trunk->parent->if_vlantrunk = NULL; 1202 /* 1203 * XXXGL: If some ithread has already entered 1204 * vlan_input() and is now blocked on the trunk 1205 * lock, then it should preempt us right after 1206 * unlock and finish its work. Then we will acquire 1207 * lock again in trunk_destroy(). 1208 */ 1209 TRUNK_UNLOCK(trunk); 1210 trunk_destroy(trunk); 1211 } else 1212 TRUNK_UNLOCK(trunk); 1213 } 1214 1215 /* Disconnect from parent. */ 1216 if (ifv->ifv_pflags) 1217 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1218 ifp->if_mtu = ETHERMTU; 1219 ifp->if_link_state = LINK_STATE_UNKNOWN; 1220 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1221 1222 /* 1223 * Only dispatch an event if vlan was 1224 * attached, otherwise there is nothing 1225 * to cleanup anyway. 1226 */ 1227 if (parent != NULL) 1228 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1229 } 1230 1231 /* Handle a reference counted flag that should be set on the parent as well */ 1232 static int 1233 vlan_setflag(struct ifnet *ifp, int flag, int status, 1234 int (*func)(struct ifnet *, int)) 1235 { 1236 struct ifvlan *ifv; 1237 int error; 1238 1239 /* XXX VLAN_LOCK_ASSERT(); */ 1240 1241 ifv = ifp->if_softc; 1242 status = status ? (ifp->if_flags & flag) : 0; 1243 /* Now "status" contains the flag value or 0 */ 1244 1245 /* 1246 * See if recorded parent's status is different from what 1247 * we want it to be. If it is, flip it. We record parent's 1248 * status in ifv_pflags so that we won't clear parent's flag 1249 * we haven't set. In fact, we don't clear or set parent's 1250 * flags directly, but get or release references to them. 1251 * That's why we can be sure that recorded flags still are 1252 * in accord with actual parent's flags. 1253 */ 1254 if (status != (ifv->ifv_pflags & flag)) { 1255 error = (*func)(PARENT(ifv), status); 1256 if (error) 1257 return (error); 1258 ifv->ifv_pflags &= ~flag; 1259 ifv->ifv_pflags |= status; 1260 } 1261 return (0); 1262 } 1263 1264 /* 1265 * Handle IFF_* flags that require certain changes on the parent: 1266 * if "status" is true, update parent's flags respective to our if_flags; 1267 * if "status" is false, forcedly clear the flags set on parent. 1268 */ 1269 static int 1270 vlan_setflags(struct ifnet *ifp, int status) 1271 { 1272 int error, i; 1273 1274 for (i = 0; vlan_pflags[i].flag; i++) { 1275 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1276 status, vlan_pflags[i].func); 1277 if (error) 1278 return (error); 1279 } 1280 return (0); 1281 } 1282 1283 /* Inform all vlans that their parent has changed link state */ 1284 static void 1285 vlan_link_state(struct ifnet *ifp, int link) 1286 { 1287 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1288 struct ifvlan *ifv; 1289 int i; 1290 1291 TRUNK_LOCK(trunk); 1292 #ifdef VLAN_ARRAY 1293 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1294 if (trunk->vlans[i] != NULL) { 1295 ifv = trunk->vlans[i]; 1296 #else 1297 for (i = 0; i < (1 << trunk->hwidth); i++) 1298 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1299 #endif 1300 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1301 if_link_state_change(ifv->ifv_ifp, 1302 trunk->parent->if_link_state); 1303 } 1304 TRUNK_UNLOCK(trunk); 1305 } 1306 1307 static void 1308 vlan_capabilities(struct ifvlan *ifv) 1309 { 1310 struct ifnet *p = PARENT(ifv); 1311 struct ifnet *ifp = ifv->ifv_ifp; 1312 1313 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1314 1315 /* 1316 * If the parent interface can do checksum offloading 1317 * on VLANs, then propagate its hardware-assisted 1318 * checksumming flags. Also assert that checksum 1319 * offloading requires hardware VLAN tagging. 1320 */ 1321 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1322 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1323 1324 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1325 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1326 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1327 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1328 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1329 } else { 1330 ifp->if_capenable = 0; 1331 ifp->if_hwassist = 0; 1332 } 1333 /* 1334 * If the parent interface can do TSO on VLANs then 1335 * propagate the hardware-assisted flag. TSO on VLANs 1336 * does not necessarily require hardware VLAN tagging. 1337 */ 1338 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1339 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1340 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1341 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1342 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1343 } else { 1344 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1345 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1346 } 1347 } 1348 1349 static void 1350 vlan_trunk_capabilities(struct ifnet *ifp) 1351 { 1352 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1353 struct ifvlan *ifv; 1354 int i; 1355 1356 TRUNK_LOCK(trunk); 1357 #ifdef VLAN_ARRAY 1358 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1359 if (trunk->vlans[i] != NULL) { 1360 ifv = trunk->vlans[i]; 1361 #else 1362 for (i = 0; i < (1 << trunk->hwidth); i++) { 1363 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1364 #endif 1365 vlan_capabilities(ifv); 1366 } 1367 TRUNK_UNLOCK(trunk); 1368 } 1369 1370 static int 1371 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1372 { 1373 struct ifnet *p; 1374 struct ifreq *ifr; 1375 struct ifvlan *ifv; 1376 struct vlanreq vlr; 1377 int error = 0; 1378 1379 ifr = (struct ifreq *)data; 1380 ifv = ifp->if_softc; 1381 1382 switch (cmd) { 1383 case SIOCGIFMEDIA: 1384 VLAN_LOCK(); 1385 if (TRUNK(ifv) != NULL) { 1386 p = PARENT(ifv); 1387 VLAN_UNLOCK(); 1388 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data); 1389 /* Limit the result to the parent's current config. */ 1390 if (error == 0) { 1391 struct ifmediareq *ifmr; 1392 1393 ifmr = (struct ifmediareq *)data; 1394 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1395 ifmr->ifm_count = 1; 1396 error = copyout(&ifmr->ifm_current, 1397 ifmr->ifm_ulist, 1398 sizeof(int)); 1399 } 1400 } 1401 } else { 1402 VLAN_UNLOCK(); 1403 error = EINVAL; 1404 } 1405 break; 1406 1407 case SIOCSIFMEDIA: 1408 error = EINVAL; 1409 break; 1410 1411 case SIOCSIFMTU: 1412 /* 1413 * Set the interface MTU. 1414 */ 1415 VLAN_LOCK(); 1416 if (TRUNK(ifv) != NULL) { 1417 if (ifr->ifr_mtu > 1418 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1419 ifr->ifr_mtu < 1420 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1421 error = EINVAL; 1422 else 1423 ifp->if_mtu = ifr->ifr_mtu; 1424 } else 1425 error = EINVAL; 1426 VLAN_UNLOCK(); 1427 break; 1428 1429 case SIOCSETVLAN: 1430 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1431 if (error) 1432 break; 1433 if (vlr.vlr_parent[0] == '\0') { 1434 vlan_unconfig(ifp); 1435 break; 1436 } 1437 p = ifunit(vlr.vlr_parent); 1438 if (p == 0) { 1439 error = ENOENT; 1440 break; 1441 } 1442 /* 1443 * Don't let the caller set up a VLAN tag with 1444 * anything except VLID bits. 1445 */ 1446 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1447 error = EINVAL; 1448 break; 1449 } 1450 error = vlan_config(ifv, p, vlr.vlr_tag); 1451 if (error) 1452 break; 1453 1454 /* Update flags on the parent, if necessary. */ 1455 vlan_setflags(ifp, 1); 1456 break; 1457 1458 case SIOCGETVLAN: 1459 bzero(&vlr, sizeof(vlr)); 1460 VLAN_LOCK(); 1461 if (TRUNK(ifv) != NULL) { 1462 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1463 sizeof(vlr.vlr_parent)); 1464 vlr.vlr_tag = ifv->ifv_tag; 1465 } 1466 VLAN_UNLOCK(); 1467 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1468 break; 1469 1470 case SIOCSIFFLAGS: 1471 /* 1472 * We should propagate selected flags to the parent, 1473 * e.g., promiscuous mode. 1474 */ 1475 if (TRUNK(ifv) != NULL) 1476 error = vlan_setflags(ifp, 1); 1477 break; 1478 1479 case SIOCADDMULTI: 1480 case SIOCDELMULTI: 1481 /* 1482 * If we don't have a parent, just remember the membership for 1483 * when we do. 1484 */ 1485 if (TRUNK(ifv) != NULL) 1486 error = vlan_setmulti(ifp); 1487 break; 1488 1489 default: 1490 error = ether_ioctl(ifp, cmd, data); 1491 } 1492 1493 return (error); 1494 }
Cache object: 5f85a15d651920e3125fd950ec5dfa88
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