Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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() sends to us via if_transmit(), rewrite them for 38 * use by the real outgoing interface, and ask it to send them. 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD: releng/8.4/sys/net/if_vlan.c 241328 2012-10-07 18:57:52Z jhb $"); 43 44 #include "opt_vlan.h" 45 46 #include <sys/param.h> 47 #include <sys/kernel.h> 48 #include <sys/lock.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/module.h> 52 #include <sys/rwlock.h> 53 #include <sys/queue.h> 54 #include <sys/socket.h> 55 #include <sys/sockio.h> 56 #include <sys/sysctl.h> 57 #include <sys/systm.h> 58 59 #include <net/bpf.h> 60 #include <net/ethernet.h> 61 #include <net/if.h> 62 #include <net/if_clone.h> 63 #include <net/if_dl.h> 64 #include <net/if_types.h> 65 #include <net/if_vlan_var.h> 66 #include <net/vnet.h> 67 68 #define VLANNAME "vlan" 69 #define VLAN_DEF_HWIDTH 4 70 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 71 72 #define UP_AND_RUNNING(ifp) \ 73 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 74 75 LIST_HEAD(ifvlanhead, ifvlan); 76 77 struct ifvlantrunk { 78 struct ifnet *parent; /* parent interface of this trunk */ 79 struct rwlock rw; 80 #ifdef VLAN_ARRAY 81 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 82 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 83 #else 84 struct ifvlanhead *hash; /* dynamic hash-list table */ 85 uint16_t hmask; 86 uint16_t hwidth; 87 #endif 88 int refcnt; 89 }; 90 91 struct vlan_mc_entry { 92 struct ether_addr mc_addr; 93 SLIST_ENTRY(vlan_mc_entry) mc_entries; 94 }; 95 96 struct ifvlan { 97 struct ifvlantrunk *ifv_trunk; 98 struct ifnet *ifv_ifp; 99 #define TRUNK(ifv) ((ifv)->ifv_trunk) 100 #define PARENT(ifv) ((ifv)->ifv_trunk->parent) 101 int ifv_pflags; /* special flags we have set on parent */ 102 struct ifv_linkmib { 103 int ifvm_encaplen; /* encapsulation length */ 104 int ifvm_mtufudge; /* MTU fudged by this much */ 105 int ifvm_mintu; /* min transmission unit */ 106 uint16_t ifvm_proto; /* encapsulation ethertype */ 107 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 108 } ifv_mib; 109 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 110 #ifndef VLAN_ARRAY 111 LIST_ENTRY(ifvlan) ifv_list; 112 #endif 113 }; 114 #define ifv_proto ifv_mib.ifvm_proto 115 #define ifv_tag ifv_mib.ifvm_tag 116 #define ifv_encaplen ifv_mib.ifvm_encaplen 117 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 118 #define ifv_mintu ifv_mib.ifvm_mintu 119 120 /* Special flags we should propagate to parent. */ 121 static struct { 122 int flag; 123 int (*func)(struct ifnet *, int); 124 } vlan_pflags[] = { 125 {IFF_PROMISC, ifpromisc}, 126 {IFF_ALLMULTI, if_allmulti}, 127 {0, NULL} 128 }; 129 130 SYSCTL_DECL(_net_link); 131 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 132 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 133 134 static int soft_pad = 0; 135 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 136 "pad short frames before tagging"); 137 138 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 139 140 static eventhandler_tag ifdetach_tag; 141 static eventhandler_tag iflladdr_tag; 142 143 /* 144 * We have a global mutex, that is used to serialize configuration 145 * changes and isn't used in normal packet delivery. 146 * 147 * We also have a per-trunk rwlock, that is locked shared on packet 148 * processing and exclusive when configuration is changed. 149 * 150 * The VLAN_ARRAY substitutes the dynamic hash with a static array 151 * with 4096 entries. In theory this can give a boost in processing, 152 * however on practice it does not. Probably this is because array 153 * is too big to fit into CPU cache. 154 */ 155 static struct mtx ifv_mtx; 156 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 157 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 158 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 159 #define VLAN_LOCK() mtx_lock(&ifv_mtx) 160 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 161 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 162 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 163 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 164 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 165 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 166 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 167 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 168 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 169 170 #ifndef VLAN_ARRAY 171 static void vlan_inithash(struct ifvlantrunk *trunk); 172 static void vlan_freehash(struct ifvlantrunk *trunk); 173 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 174 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 175 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 176 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 177 uint16_t tag); 178 #endif 179 static void trunk_destroy(struct ifvlantrunk *trunk); 180 181 static void vlan_init(void *foo); 182 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 183 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 184 static void vlan_qflush(struct ifnet *ifp); 185 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 186 int (*func)(struct ifnet *, int)); 187 static int vlan_setflags(struct ifnet *ifp, int status); 188 static int vlan_setmulti(struct ifnet *ifp); 189 static int vlan_transmit(struct ifnet *ifp, struct mbuf *m); 190 static void vlan_unconfig(struct ifnet *ifp); 191 static void vlan_unconfig_locked(struct ifnet *ifp, int departing); 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 #ifdef VIMAGE 210 static VNET_DEFINE(struct if_clone, vlan_cloner); 211 #define V_vlan_cloner VNET(vlan_cloner) 212 #endif 213 214 #ifndef VLAN_ARRAY 215 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 216 217 static void 218 vlan_inithash(struct ifvlantrunk *trunk) 219 { 220 int i, n; 221 222 /* 223 * The trunk must not be locked here since we call malloc(M_WAITOK). 224 * It is OK in case this function is called before the trunk struct 225 * gets hooked up and becomes visible from other threads. 226 */ 227 228 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 229 ("%s: hash already initialized", __func__)); 230 231 trunk->hwidth = VLAN_DEF_HWIDTH; 232 n = 1 << trunk->hwidth; 233 trunk->hmask = n - 1; 234 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 235 for (i = 0; i < n; i++) 236 LIST_INIT(&trunk->hash[i]); 237 } 238 239 static void 240 vlan_freehash(struct ifvlantrunk *trunk) 241 { 242 #ifdef INVARIANTS 243 int i; 244 245 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 246 for (i = 0; i < (1 << trunk->hwidth); i++) 247 KASSERT(LIST_EMPTY(&trunk->hash[i]), 248 ("%s: hash table not empty", __func__)); 249 #endif 250 free(trunk->hash, M_VLAN); 251 trunk->hash = NULL; 252 trunk->hwidth = trunk->hmask = 0; 253 } 254 255 static int 256 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 257 { 258 int i, b; 259 struct ifvlan *ifv2; 260 261 TRUNK_LOCK_ASSERT(trunk); 262 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 263 264 b = 1 << trunk->hwidth; 265 i = HASH(ifv->ifv_tag, trunk->hmask); 266 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 267 if (ifv->ifv_tag == ifv2->ifv_tag) 268 return (EEXIST); 269 270 /* 271 * Grow the hash when the number of vlans exceeds half of the number of 272 * hash buckets squared. This will make the average linked-list length 273 * buckets/2. 274 */ 275 if (trunk->refcnt > (b * b) / 2) { 276 vlan_growhash(trunk, 1); 277 i = HASH(ifv->ifv_tag, trunk->hmask); 278 } 279 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 280 trunk->refcnt++; 281 282 return (0); 283 } 284 285 static int 286 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 287 { 288 int i, b; 289 struct ifvlan *ifv2; 290 291 TRUNK_LOCK_ASSERT(trunk); 292 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 293 294 b = 1 << trunk->hwidth; 295 i = HASH(ifv->ifv_tag, trunk->hmask); 296 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 297 if (ifv2 == ifv) { 298 trunk->refcnt--; 299 LIST_REMOVE(ifv2, ifv_list); 300 if (trunk->refcnt < (b * b) / 2) 301 vlan_growhash(trunk, -1); 302 return (0); 303 } 304 305 panic("%s: vlan not found\n", __func__); 306 return (ENOENT); /*NOTREACHED*/ 307 } 308 309 /* 310 * Grow the hash larger or smaller if memory permits. 311 */ 312 static void 313 vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 314 { 315 struct ifvlan *ifv; 316 struct ifvlanhead *hash2; 317 int hwidth2, i, j, n, n2; 318 319 TRUNK_LOCK_ASSERT(trunk); 320 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 321 322 if (howmuch == 0) { 323 /* Harmless yet obvious coding error */ 324 printf("%s: howmuch is 0\n", __func__); 325 return; 326 } 327 328 hwidth2 = trunk->hwidth + howmuch; 329 n = 1 << trunk->hwidth; 330 n2 = 1 << hwidth2; 331 /* Do not shrink the table below the default */ 332 if (hwidth2 < VLAN_DEF_HWIDTH) 333 return; 334 335 /* M_NOWAIT because we're called with trunk mutex held */ 336 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 337 if (hash2 == NULL) { 338 printf("%s: out of memory -- hash size not changed\n", 339 __func__); 340 return; /* We can live with the old hash table */ 341 } 342 for (j = 0; j < n2; j++) 343 LIST_INIT(&hash2[j]); 344 for (i = 0; i < n; i++) 345 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 346 LIST_REMOVE(ifv, ifv_list); 347 j = HASH(ifv->ifv_tag, n2 - 1); 348 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 349 } 350 free(trunk->hash, M_VLAN); 351 trunk->hash = hash2; 352 trunk->hwidth = hwidth2; 353 trunk->hmask = n2 - 1; 354 355 if (bootverbose) 356 if_printf(trunk->parent, 357 "VLAN hash table resized from %d to %d buckets\n", n, n2); 358 } 359 360 static __inline struct ifvlan * 361 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 362 { 363 struct ifvlan *ifv; 364 365 TRUNK_LOCK_RASSERT(trunk); 366 367 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 368 if (ifv->ifv_tag == tag) 369 return (ifv); 370 return (NULL); 371 } 372 373 #if 0 374 /* Debugging code to view the hashtables. */ 375 static void 376 vlan_dumphash(struct ifvlantrunk *trunk) 377 { 378 int i; 379 struct ifvlan *ifv; 380 381 for (i = 0; i < (1 << trunk->hwidth); i++) { 382 printf("%d: ", i); 383 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 384 printf("%s ", ifv->ifv_ifp->if_xname); 385 printf("\n"); 386 } 387 } 388 #endif /* 0 */ 389 #endif /* !VLAN_ARRAY */ 390 391 static void 392 trunk_destroy(struct ifvlantrunk *trunk) 393 { 394 VLAN_LOCK_ASSERT(); 395 396 TRUNK_LOCK(trunk); 397 #ifndef VLAN_ARRAY 398 vlan_freehash(trunk); 399 #endif 400 trunk->parent->if_vlantrunk = NULL; 401 TRUNK_UNLOCK(trunk); 402 TRUNK_LOCK_DESTROY(trunk); 403 free(trunk, M_VLAN); 404 } 405 406 /* 407 * Program our multicast filter. What we're actually doing is 408 * programming the multicast filter of the parent. This has the 409 * side effect of causing the parent interface to receive multicast 410 * traffic that it doesn't really want, which ends up being discarded 411 * later by the upper protocol layers. Unfortunately, there's no way 412 * to avoid this: there really is only one physical interface. 413 * 414 * XXX: There is a possible race here if more than one thread is 415 * modifying the multicast state of the vlan interface at the same time. 416 */ 417 static int 418 vlan_setmulti(struct ifnet *ifp) 419 { 420 struct ifnet *ifp_p; 421 struct ifmultiaddr *ifma, *rifma = NULL; 422 struct ifvlan *sc; 423 struct vlan_mc_entry *mc; 424 struct sockaddr_dl sdl; 425 int error; 426 427 /*VLAN_LOCK_ASSERT();*/ 428 429 /* Find the parent. */ 430 sc = ifp->if_softc; 431 ifp_p = PARENT(sc); 432 433 CURVNET_SET_QUIET(ifp_p->if_vnet); 434 435 bzero((char *)&sdl, sizeof(sdl)); 436 sdl.sdl_len = sizeof(sdl); 437 sdl.sdl_family = AF_LINK; 438 sdl.sdl_index = ifp_p->if_index; 439 sdl.sdl_type = IFT_ETHER; 440 sdl.sdl_alen = ETHER_ADDR_LEN; 441 442 /* First, remove any existing filter entries. */ 443 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 444 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 445 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 446 if (error) 447 return (error); 448 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 449 free(mc, M_VLAN); 450 } 451 452 /* Now program new ones. */ 453 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 454 if (ifma->ifma_addr->sa_family != AF_LINK) 455 continue; 456 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 457 if (mc == NULL) 458 return (ENOMEM); 459 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 460 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 461 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 462 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 463 LLADDR(&sdl), ETHER_ADDR_LEN); 464 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 465 if (error) 466 return (error); 467 } 468 469 CURVNET_RESTORE(); 470 return (0); 471 } 472 473 /* 474 * A handler for parent interface link layer address changes. 475 * If the parent interface link layer address is changed we 476 * should also change it on all children vlans. 477 */ 478 static void 479 vlan_iflladdr(void *arg __unused, struct ifnet *ifp) 480 { 481 struct ifvlan *ifv; 482 #ifndef VLAN_ARRAY 483 struct ifvlan *next; 484 #endif 485 int i; 486 487 /* 488 * Check if it's a trunk interface first of all 489 * to avoid needless locking. 490 */ 491 if (ifp->if_vlantrunk == NULL) 492 return; 493 494 VLAN_LOCK(); 495 /* 496 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it. 497 */ 498 #ifdef VLAN_ARRAY 499 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 500 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 501 #else /* VLAN_ARRAY */ 502 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 503 LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) { 504 #endif /* VLAN_ARRAY */ 505 VLAN_UNLOCK(); 506 if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), ETHER_ADDR_LEN); 507 VLAN_LOCK(); 508 } 509 VLAN_UNLOCK(); 510 511 } 512 513 /* 514 * A handler for network interface departure events. 515 * Track departure of trunks here so that we don't access invalid 516 * pointers or whatever if a trunk is ripped from under us, e.g., 517 * by ejecting its hot-plug card. However, if an ifnet is simply 518 * being renamed, then there's no need to tear down the state. 519 */ 520 static void 521 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 522 { 523 struct ifvlan *ifv; 524 int i; 525 526 /* 527 * Check if it's a trunk interface first of all 528 * to avoid needless locking. 529 */ 530 if (ifp->if_vlantrunk == NULL) 531 return; 532 533 /* If the ifnet is just being renamed, don't do anything. */ 534 if (ifp->if_flags & IFF_RENAMING) 535 return; 536 537 VLAN_LOCK(); 538 /* 539 * OK, it's a trunk. Loop over and detach all vlan's on it. 540 * Check trunk pointer after each vlan_unconfig() as it will 541 * free it and set to NULL after the last vlan was detached. 542 */ 543 #ifdef VLAN_ARRAY 544 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 545 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 546 vlan_unconfig_locked(ifv->ifv_ifp, 1); 547 if (ifp->if_vlantrunk == NULL) 548 break; 549 } 550 #else /* VLAN_ARRAY */ 551 restart: 552 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 553 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 554 vlan_unconfig_locked(ifv->ifv_ifp, 1); 555 if (ifp->if_vlantrunk) 556 goto restart; /* trunk->hwidth can change */ 557 else 558 break; 559 } 560 #endif /* VLAN_ARRAY */ 561 /* Trunk should have been destroyed in vlan_unconfig(). */ 562 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 563 VLAN_UNLOCK(); 564 } 565 566 /* 567 * VLAN support can be loaded as a module. The only place in the 568 * system that's intimately aware of this is ether_input. We hook 569 * into this code through vlan_input_p which is defined there and 570 * set here. Noone else in the system should be aware of this so 571 * we use an explicit reference here. 572 */ 573 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 574 575 /* For if_link_state_change() eyes only... */ 576 extern void (*vlan_link_state_p)(struct ifnet *, int); 577 578 static int 579 vlan_modevent(module_t mod, int type, void *data) 580 { 581 582 switch (type) { 583 case MOD_LOAD: 584 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 585 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 586 if (ifdetach_tag == NULL) 587 return (ENOMEM); 588 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 589 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 590 if (iflladdr_tag == NULL) 591 return (ENOMEM); 592 VLAN_LOCK_INIT(); 593 vlan_input_p = vlan_input; 594 vlan_link_state_p = vlan_link_state; 595 vlan_trunk_cap_p = vlan_trunk_capabilities; 596 #ifndef VIMAGE 597 if_clone_attach(&vlan_cloner); 598 #endif 599 if (bootverbose) 600 printf("vlan: initialized, using " 601 #ifdef VLAN_ARRAY 602 "full-size arrays" 603 #else 604 "hash tables with chaining" 605 #endif 606 607 "\n"); 608 break; 609 case MOD_UNLOAD: 610 #ifndef VIMAGE 611 if_clone_detach(&vlan_cloner); 612 #endif 613 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 614 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag); 615 vlan_input_p = NULL; 616 vlan_link_state_p = NULL; 617 vlan_trunk_cap_p = NULL; 618 VLAN_LOCK_DESTROY(); 619 if (bootverbose) 620 printf("vlan: unloaded\n"); 621 break; 622 default: 623 return (EOPNOTSUPP); 624 } 625 return (0); 626 } 627 628 static moduledata_t vlan_mod = { 629 "if_vlan", 630 vlan_modevent, 631 0 632 }; 633 634 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 635 MODULE_VERSION(if_vlan, 3); 636 637 #ifdef VIMAGE 638 static void 639 vnet_vlan_init(const void *unused __unused) 640 { 641 642 V_vlan_cloner = vlan_cloner; 643 if_clone_attach(&V_vlan_cloner); 644 } 645 VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 646 vnet_vlan_init, NULL); 647 648 static void 649 vnet_vlan_uninit(const void *unused __unused) 650 { 651 652 if_clone_detach(&V_vlan_cloner); 653 } 654 VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 655 vnet_vlan_uninit, NULL); 656 #endif 657 658 static struct ifnet * 659 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 660 { 661 const char *cp; 662 struct ifnet *ifp; 663 int t; 664 665 /* Check for <etherif>.<vlan> style interface names. */ 666 IFNET_RLOCK_NOSLEEP(); 667 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 668 if (ifp->if_type != IFT_ETHER) 669 continue; 670 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 671 continue; 672 cp = name + strlen(ifp->if_xname); 673 if (*cp++ != '.') 674 continue; 675 if (*cp == '\0') 676 continue; 677 t = 0; 678 for(; *cp >= '' && *cp <= '9'; cp++) 679 t = (t * 10) + (*cp - ''); 680 if (*cp != '\0') 681 continue; 682 if (tag != NULL) 683 *tag = t; 684 break; 685 } 686 IFNET_RUNLOCK_NOSLEEP(); 687 688 return (ifp); 689 } 690 691 static int 692 vlan_clone_match(struct if_clone *ifc, const char *name) 693 { 694 const char *cp; 695 696 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 697 return (1); 698 699 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 700 return (0); 701 for (cp = name + 4; *cp != '\0'; cp++) { 702 if (*cp < '' || *cp > '9') 703 return (0); 704 } 705 706 return (1); 707 } 708 709 static int 710 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 711 { 712 char *dp; 713 int wildcard; 714 int unit; 715 int error; 716 int tag; 717 int ethertag; 718 struct ifvlan *ifv; 719 struct ifnet *ifp; 720 struct ifnet *p; 721 struct vlanreq vlr; 722 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 723 724 /* 725 * There are 3 (ugh) ways to specify the cloned device: 726 * o pass a parameter block with the clone request. 727 * o specify parameters in the text of the clone device name 728 * o specify no parameters and get an unattached device that 729 * must be configured separately. 730 * The first technique is preferred; the latter two are 731 * supported for backwards compatibilty. 732 */ 733 if (params) { 734 error = copyin(params, &vlr, sizeof(vlr)); 735 if (error) 736 return error; 737 p = ifunit(vlr.vlr_parent); 738 if (p == NULL) 739 return ENXIO; 740 /* 741 * Don't let the caller set up a VLAN tag with 742 * anything except VLID bits. 743 */ 744 if (vlr.vlr_tag & ~EVL_VLID_MASK) 745 return (EINVAL); 746 error = ifc_name2unit(name, &unit); 747 if (error != 0) 748 return (error); 749 750 ethertag = 1; 751 tag = vlr.vlr_tag; 752 wildcard = (unit < 0); 753 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 754 ethertag = 1; 755 unit = -1; 756 wildcard = 0; 757 758 /* 759 * Don't let the caller set up a VLAN tag with 760 * anything except VLID bits. 761 */ 762 if (tag & ~EVL_VLID_MASK) 763 return (EINVAL); 764 } else { 765 ethertag = 0; 766 767 error = ifc_name2unit(name, &unit); 768 if (error != 0) 769 return (error); 770 771 wildcard = (unit < 0); 772 } 773 774 error = ifc_alloc_unit(ifc, &unit); 775 if (error != 0) 776 return (error); 777 778 /* In the wildcard case, we need to update the name. */ 779 if (wildcard) { 780 for (dp = name; *dp != '\0'; dp++); 781 if (snprintf(dp, len - (dp-name), "%d", unit) > 782 len - (dp-name) - 1) { 783 panic("%s: interface name too long", __func__); 784 } 785 } 786 787 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 788 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 789 if (ifp == NULL) { 790 ifc_free_unit(ifc, unit); 791 free(ifv, M_VLAN); 792 return (ENOSPC); 793 } 794 SLIST_INIT(&ifv->vlan_mc_listhead); 795 796 ifp->if_softc = ifv; 797 /* 798 * Set the name manually rather than using if_initname because 799 * we don't conform to the default naming convention for interfaces. 800 */ 801 strlcpy(ifp->if_xname, name, IFNAMSIZ); 802 ifp->if_dname = ifc->ifc_name; 803 ifp->if_dunit = unit; 804 /* NB: flags are not set here */ 805 ifp->if_linkmib = &ifv->ifv_mib; 806 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 807 /* NB: mtu is not set here */ 808 809 ifp->if_init = vlan_init; 810 ifp->if_transmit = vlan_transmit; 811 ifp->if_qflush = vlan_qflush; 812 ifp->if_ioctl = vlan_ioctl; 813 ifp->if_flags = VLAN_IFFLAGS; 814 ether_ifattach(ifp, eaddr); 815 /* Now undo some of the damage... */ 816 ifp->if_baudrate = 0; 817 ifp->if_type = IFT_L2VLAN; 818 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 819 820 if (ethertag) { 821 error = vlan_config(ifv, p, tag); 822 if (error != 0) { 823 /* 824 * Since we've partially failed, we need to back 825 * out all the way, otherwise userland could get 826 * confused. Thus, we destroy the interface. 827 */ 828 ether_ifdetach(ifp); 829 vlan_unconfig(ifp); 830 if_free_type(ifp, IFT_ETHER); 831 ifc_free_unit(ifc, unit); 832 free(ifv, M_VLAN); 833 834 return (error); 835 } 836 837 /* Update flags on the parent, if necessary. */ 838 vlan_setflags(ifp, 1); 839 } 840 841 return (0); 842 } 843 844 static int 845 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 846 { 847 struct ifvlan *ifv = ifp->if_softc; 848 int unit = ifp->if_dunit; 849 850 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 851 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 852 if_free_type(ifp, IFT_ETHER); 853 free(ifv, M_VLAN); 854 ifc_free_unit(ifc, unit); 855 856 return (0); 857 } 858 859 /* 860 * The ifp->if_init entry point for vlan(4) is a no-op. 861 */ 862 static void 863 vlan_init(void *foo __unused) 864 { 865 } 866 867 /* 868 * The if_transmit method for vlan(4) interface. 869 */ 870 static int 871 vlan_transmit(struct ifnet *ifp, struct mbuf *m) 872 { 873 struct ifvlan *ifv; 874 struct ifnet *p; 875 int error, len, mcast; 876 877 ifv = ifp->if_softc; 878 p = PARENT(ifv); 879 len = m->m_pkthdr.len; 880 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0; 881 882 BPF_MTAP(ifp, m); 883 884 /* 885 * Do not run parent's if_transmit() if the parent is not up, 886 * or parent's driver will cause a system crash. 887 */ 888 if (!UP_AND_RUNNING(p)) { 889 m_freem(m); 890 ifp->if_oerrors++; 891 return (0); 892 } 893 894 /* 895 * Pad the frame to the minimum size allowed if told to. 896 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 897 * paragraph C.4.4.3.b. It can help to work around buggy 898 * bridges that violate paragraph C.4.4.3.a from the same 899 * document, i.e., fail to pad short frames after untagging. 900 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 901 * untagging it will produce a 62-byte frame, which is a runt 902 * and requires padding. There are VLAN-enabled network 903 * devices that just discard such runts instead or mishandle 904 * them somehow. 905 */ 906 if (soft_pad) { 907 static char pad[8]; /* just zeros */ 908 int n; 909 910 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 911 n > 0; n -= sizeof(pad)) 912 if (!m_append(m, min(n, sizeof(pad)), pad)) 913 break; 914 915 if (n > 0) { 916 if_printf(ifp, "cannot pad short frame\n"); 917 ifp->if_oerrors++; 918 m_freem(m); 919 return (0); 920 } 921 } 922 923 /* 924 * If underlying interface can do VLAN tag insertion itself, 925 * just pass the packet along. However, we need some way to 926 * tell the interface where the packet came from so that it 927 * knows how to find the VLAN tag to use, so we attach a 928 * packet tag that holds it. 929 */ 930 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 931 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 932 m->m_flags |= M_VLANTAG; 933 } else { 934 m = ether_vlanencap(m, ifv->ifv_tag); 935 if (m == NULL) { 936 if_printf(ifp, "unable to prepend VLAN header\n"); 937 ifp->if_oerrors++; 938 return (0); 939 } 940 } 941 942 /* 943 * Send it, precisely as ether_output() would have. 944 */ 945 error = (p->if_transmit)(p, m); 946 if (!error) { 947 ifp->if_opackets++; 948 ifp->if_omcasts += mcast; 949 ifp->if_obytes += len; 950 } else 951 ifp->if_oerrors++; 952 return (error); 953 } 954 955 /* 956 * The ifp->if_qflush entry point for vlan(4) is a no-op. 957 */ 958 static void 959 vlan_qflush(struct ifnet *ifp __unused) 960 { 961 } 962 963 static void 964 vlan_input(struct ifnet *ifp, struct mbuf *m) 965 { 966 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 967 struct ifvlan *ifv; 968 uint16_t tag; 969 970 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 971 972 if (m->m_flags & M_VLANTAG) { 973 /* 974 * Packet is tagged, but m contains a normal 975 * Ethernet frame; the tag is stored out-of-band. 976 */ 977 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 978 m->m_flags &= ~M_VLANTAG; 979 } else { 980 struct ether_vlan_header *evl; 981 982 /* 983 * Packet is tagged in-band as specified by 802.1q. 984 */ 985 switch (ifp->if_type) { 986 case IFT_ETHER: 987 if (m->m_len < sizeof(*evl) && 988 (m = m_pullup(m, sizeof(*evl))) == NULL) { 989 if_printf(ifp, "cannot pullup VLAN header\n"); 990 return; 991 } 992 evl = mtod(m, struct ether_vlan_header *); 993 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 994 995 /* 996 * Remove the 802.1q header by copying the Ethernet 997 * addresses over it and adjusting the beginning of 998 * the data in the mbuf. The encapsulated Ethernet 999 * type field is already in place. 1000 */ 1001 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 1002 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1003 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1004 break; 1005 1006 default: 1007 #ifdef INVARIANTS 1008 panic("%s: %s has unsupported if_type %u", 1009 __func__, ifp->if_xname, ifp->if_type); 1010 #endif 1011 m_freem(m); 1012 ifp->if_noproto++; 1013 return; 1014 } 1015 } 1016 1017 TRUNK_RLOCK(trunk); 1018 #ifdef VLAN_ARRAY 1019 ifv = trunk->vlans[tag]; 1020 #else 1021 ifv = vlan_gethash(trunk, tag); 1022 #endif 1023 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 1024 TRUNK_RUNLOCK(trunk); 1025 m_freem(m); 1026 ifp->if_noproto++; 1027 return; 1028 } 1029 TRUNK_RUNLOCK(trunk); 1030 1031 m->m_pkthdr.rcvif = ifv->ifv_ifp; 1032 ifv->ifv_ifp->if_ipackets++; 1033 1034 /* Pass it back through the parent's input routine. */ 1035 (*ifp->if_input)(ifv->ifv_ifp, m); 1036 } 1037 1038 static int 1039 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 1040 { 1041 struct ifvlantrunk *trunk; 1042 struct ifnet *ifp; 1043 int error = 0; 1044 1045 /* VID numbers 0x0 and 0xFFF are reserved */ 1046 if (tag == 0 || tag == 0xFFF) 1047 return (EINVAL); 1048 if (p->if_type != IFT_ETHER) 1049 return (EPROTONOSUPPORT); 1050 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1051 return (EPROTONOSUPPORT); 1052 if (ifv->ifv_trunk) 1053 return (EBUSY); 1054 1055 if (p->if_vlantrunk == NULL) { 1056 trunk = malloc(sizeof(struct ifvlantrunk), 1057 M_VLAN, M_WAITOK | M_ZERO); 1058 #ifndef VLAN_ARRAY 1059 vlan_inithash(trunk); 1060 #endif 1061 VLAN_LOCK(); 1062 if (p->if_vlantrunk != NULL) { 1063 /* A race that that is very unlikely to be hit. */ 1064 #ifndef VLAN_ARRAY 1065 vlan_freehash(trunk); 1066 #endif 1067 free(trunk, M_VLAN); 1068 goto exists; 1069 } 1070 TRUNK_LOCK_INIT(trunk); 1071 TRUNK_LOCK(trunk); 1072 p->if_vlantrunk = trunk; 1073 trunk->parent = p; 1074 } else { 1075 VLAN_LOCK(); 1076 exists: 1077 trunk = p->if_vlantrunk; 1078 TRUNK_LOCK(trunk); 1079 } 1080 1081 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1082 #ifdef VLAN_ARRAY 1083 if (trunk->vlans[tag] != NULL) { 1084 error = EEXIST; 1085 goto done; 1086 } 1087 trunk->vlans[tag] = ifv; 1088 trunk->refcnt++; 1089 #else 1090 error = vlan_inshash(trunk, ifv); 1091 if (error) 1092 goto done; 1093 #endif 1094 ifv->ifv_proto = ETHERTYPE_VLAN; 1095 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1096 ifv->ifv_mintu = ETHERMIN; 1097 ifv->ifv_pflags = 0; 1098 1099 /* 1100 * If the parent supports the VLAN_MTU capability, 1101 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1102 * use it. 1103 */ 1104 if (p->if_capenable & IFCAP_VLAN_MTU) { 1105 /* 1106 * No need to fudge the MTU since the parent can 1107 * handle extended frames. 1108 */ 1109 ifv->ifv_mtufudge = 0; 1110 } else { 1111 /* 1112 * Fudge the MTU by the encapsulation size. This 1113 * makes us incompatible with strictly compliant 1114 * 802.1Q implementations, but allows us to use 1115 * the feature with other NetBSD implementations, 1116 * which might still be useful. 1117 */ 1118 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1119 } 1120 1121 ifv->ifv_trunk = trunk; 1122 ifp = ifv->ifv_ifp; 1123 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1124 ifp->if_baudrate = p->if_baudrate; 1125 /* 1126 * Copy only a selected subset of flags from the parent. 1127 * Other flags are none of our business. 1128 */ 1129 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1130 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1131 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1132 #undef VLAN_COPY_FLAGS 1133 1134 ifp->if_link_state = p->if_link_state; 1135 1136 vlan_capabilities(ifv); 1137 1138 /* 1139 * Set up our ``Ethernet address'' to reflect the underlying 1140 * physical interface's. 1141 */ 1142 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1143 1144 /* 1145 * Configure multicast addresses that may already be 1146 * joined on the vlan device. 1147 */ 1148 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1149 1150 /* We are ready for operation now. */ 1151 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1152 done: 1153 TRUNK_UNLOCK(trunk); 1154 if (error == 0) 1155 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1156 VLAN_UNLOCK(); 1157 1158 return (error); 1159 } 1160 1161 static void 1162 vlan_unconfig(struct ifnet *ifp) 1163 { 1164 1165 VLAN_LOCK(); 1166 vlan_unconfig_locked(ifp, 0); 1167 VLAN_UNLOCK(); 1168 } 1169 1170 static void 1171 vlan_unconfig_locked(struct ifnet *ifp, int departing) 1172 { 1173 struct ifvlantrunk *trunk; 1174 struct vlan_mc_entry *mc; 1175 struct ifvlan *ifv; 1176 struct ifnet *parent; 1177 int error; 1178 1179 VLAN_LOCK_ASSERT(); 1180 1181 ifv = ifp->if_softc; 1182 trunk = ifv->ifv_trunk; 1183 parent = NULL; 1184 1185 if (trunk != NULL) { 1186 struct sockaddr_dl sdl; 1187 1188 TRUNK_LOCK(trunk); 1189 parent = trunk->parent; 1190 1191 /* 1192 * Since the interface is being unconfigured, we need to 1193 * empty the list of multicast groups that we may have joined 1194 * while we were alive from the parent's list. 1195 */ 1196 bzero((char *)&sdl, sizeof(sdl)); 1197 sdl.sdl_len = sizeof(sdl); 1198 sdl.sdl_family = AF_LINK; 1199 sdl.sdl_index = parent->if_index; 1200 sdl.sdl_type = IFT_ETHER; 1201 sdl.sdl_alen = ETHER_ADDR_LEN; 1202 1203 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1204 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1205 ETHER_ADDR_LEN); 1206 1207 /* 1208 * If the parent interface is being detached, 1209 * all its multicast addresses have already 1210 * been removed. Warn about errors if 1211 * if_delmulti() does fail, but don't abort as 1212 * all callers expect vlan destruction to 1213 * succeed. 1214 */ 1215 if (!departing) { 1216 error = if_delmulti(parent, 1217 (struct sockaddr *)&sdl); 1218 if (error) 1219 if_printf(ifp, 1220 "Failed to delete multicast address from parent: %d\n", 1221 error); 1222 } 1223 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1224 free(mc, M_VLAN); 1225 } 1226 1227 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1228 #ifdef VLAN_ARRAY 1229 trunk->vlans[ifv->ifv_tag] = NULL; 1230 trunk->refcnt--; 1231 #else 1232 vlan_remhash(trunk, ifv); 1233 #endif 1234 ifv->ifv_trunk = NULL; 1235 1236 /* 1237 * Check if we were the last. 1238 */ 1239 if (trunk->refcnt == 0) { 1240 trunk->parent->if_vlantrunk = NULL; 1241 /* 1242 * XXXGL: If some ithread has already entered 1243 * vlan_input() and is now blocked on the trunk 1244 * lock, then it should preempt us right after 1245 * unlock and finish its work. Then we will acquire 1246 * lock again in trunk_destroy(). 1247 */ 1248 TRUNK_UNLOCK(trunk); 1249 trunk_destroy(trunk); 1250 } else 1251 TRUNK_UNLOCK(trunk); 1252 } 1253 1254 /* Disconnect from parent. */ 1255 if (ifv->ifv_pflags) 1256 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1257 ifp->if_mtu = ETHERMTU; 1258 ifp->if_link_state = LINK_STATE_UNKNOWN; 1259 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1260 1261 /* 1262 * Only dispatch an event if vlan was 1263 * attached, otherwise there is nothing 1264 * to cleanup anyway. 1265 */ 1266 if (parent != NULL) 1267 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1268 } 1269 1270 /* Handle a reference counted flag that should be set on the parent as well */ 1271 static int 1272 vlan_setflag(struct ifnet *ifp, int flag, int status, 1273 int (*func)(struct ifnet *, int)) 1274 { 1275 struct ifvlan *ifv; 1276 int error; 1277 1278 /* XXX VLAN_LOCK_ASSERT(); */ 1279 1280 ifv = ifp->if_softc; 1281 status = status ? (ifp->if_flags & flag) : 0; 1282 /* Now "status" contains the flag value or 0 */ 1283 1284 /* 1285 * See if recorded parent's status is different from what 1286 * we want it to be. If it is, flip it. We record parent's 1287 * status in ifv_pflags so that we won't clear parent's flag 1288 * we haven't set. In fact, we don't clear or set parent's 1289 * flags directly, but get or release references to them. 1290 * That's why we can be sure that recorded flags still are 1291 * in accord with actual parent's flags. 1292 */ 1293 if (status != (ifv->ifv_pflags & flag)) { 1294 error = (*func)(PARENT(ifv), status); 1295 if (error) 1296 return (error); 1297 ifv->ifv_pflags &= ~flag; 1298 ifv->ifv_pflags |= status; 1299 } 1300 return (0); 1301 } 1302 1303 /* 1304 * Handle IFF_* flags that require certain changes on the parent: 1305 * if "status" is true, update parent's flags respective to our if_flags; 1306 * if "status" is false, forcedly clear the flags set on parent. 1307 */ 1308 static int 1309 vlan_setflags(struct ifnet *ifp, int status) 1310 { 1311 int error, i; 1312 1313 for (i = 0; vlan_pflags[i].flag; i++) { 1314 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1315 status, vlan_pflags[i].func); 1316 if (error) 1317 return (error); 1318 } 1319 return (0); 1320 } 1321 1322 /* Inform all vlans that their parent has changed link state */ 1323 static void 1324 vlan_link_state(struct ifnet *ifp, int link) 1325 { 1326 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1327 struct ifvlan *ifv; 1328 int i; 1329 1330 TRUNK_LOCK(trunk); 1331 #ifdef VLAN_ARRAY 1332 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1333 if (trunk->vlans[i] != NULL) { 1334 ifv = trunk->vlans[i]; 1335 #else 1336 for (i = 0; i < (1 << trunk->hwidth); i++) 1337 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1338 #endif 1339 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1340 if_link_state_change(ifv->ifv_ifp, 1341 trunk->parent->if_link_state); 1342 } 1343 TRUNK_UNLOCK(trunk); 1344 } 1345 1346 static void 1347 vlan_capabilities(struct ifvlan *ifv) 1348 { 1349 struct ifnet *p = PARENT(ifv); 1350 struct ifnet *ifp = ifv->ifv_ifp; 1351 1352 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1353 1354 /* 1355 * If the parent interface can do checksum offloading 1356 * on VLANs, then propagate its hardware-assisted 1357 * checksumming flags. Also assert that checksum 1358 * offloading requires hardware VLAN tagging. 1359 */ 1360 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1361 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1362 1363 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1364 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1365 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1366 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1367 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1368 } else { 1369 ifp->if_capenable = 0; 1370 ifp->if_hwassist = 0; 1371 } 1372 /* 1373 * If the parent interface can do TSO on VLANs then 1374 * propagate the hardware-assisted flag. TSO on VLANs 1375 * does not necessarily require hardware VLAN tagging. 1376 */ 1377 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1378 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1379 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1380 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1381 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1382 } else { 1383 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1384 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1385 } 1386 } 1387 1388 static void 1389 vlan_trunk_capabilities(struct ifnet *ifp) 1390 { 1391 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1392 struct ifvlan *ifv; 1393 int i; 1394 1395 TRUNK_LOCK(trunk); 1396 #ifdef VLAN_ARRAY 1397 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1398 if (trunk->vlans[i] != NULL) { 1399 ifv = trunk->vlans[i]; 1400 #else 1401 for (i = 0; i < (1 << trunk->hwidth); i++) { 1402 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1403 #endif 1404 vlan_capabilities(ifv); 1405 } 1406 TRUNK_UNLOCK(trunk); 1407 } 1408 1409 static int 1410 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1411 { 1412 struct ifnet *p; 1413 struct ifreq *ifr; 1414 struct ifvlan *ifv; 1415 struct vlanreq vlr; 1416 int error = 0; 1417 1418 ifr = (struct ifreq *)data; 1419 ifv = ifp->if_softc; 1420 1421 switch (cmd) { 1422 case SIOCGIFMEDIA: 1423 VLAN_LOCK(); 1424 if (TRUNK(ifv) != NULL) { 1425 p = PARENT(ifv); 1426 VLAN_UNLOCK(); 1427 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data); 1428 /* Limit the result to the parent's current config. */ 1429 if (error == 0) { 1430 struct ifmediareq *ifmr; 1431 1432 ifmr = (struct ifmediareq *)data; 1433 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1434 ifmr->ifm_count = 1; 1435 error = copyout(&ifmr->ifm_current, 1436 ifmr->ifm_ulist, 1437 sizeof(int)); 1438 } 1439 } 1440 } else { 1441 VLAN_UNLOCK(); 1442 error = EINVAL; 1443 } 1444 break; 1445 1446 case SIOCSIFMEDIA: 1447 error = EINVAL; 1448 break; 1449 1450 case SIOCSIFMTU: 1451 /* 1452 * Set the interface MTU. 1453 */ 1454 VLAN_LOCK(); 1455 if (TRUNK(ifv) != NULL) { 1456 if (ifr->ifr_mtu > 1457 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1458 ifr->ifr_mtu < 1459 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1460 error = EINVAL; 1461 else 1462 ifp->if_mtu = ifr->ifr_mtu; 1463 } else 1464 error = EINVAL; 1465 VLAN_UNLOCK(); 1466 break; 1467 1468 case SIOCSETVLAN: 1469 #ifdef VIMAGE 1470 if (ifp->if_vnet != ifp->if_home_vnet) { 1471 error = EPERM; 1472 break; 1473 } 1474 #endif 1475 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1476 if (error) 1477 break; 1478 if (vlr.vlr_parent[0] == '\0') { 1479 vlan_unconfig(ifp); 1480 break; 1481 } 1482 p = ifunit(vlr.vlr_parent); 1483 if (p == 0) { 1484 error = ENOENT; 1485 break; 1486 } 1487 /* 1488 * Don't let the caller set up a VLAN tag with 1489 * anything except VLID bits. 1490 */ 1491 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1492 error = EINVAL; 1493 break; 1494 } 1495 error = vlan_config(ifv, p, vlr.vlr_tag); 1496 if (error) 1497 break; 1498 1499 /* Update flags on the parent, if necessary. */ 1500 vlan_setflags(ifp, 1); 1501 break; 1502 1503 case SIOCGETVLAN: 1504 #ifdef VIMAGE 1505 if (ifp->if_vnet != ifp->if_home_vnet) { 1506 error = EPERM; 1507 break; 1508 } 1509 #endif 1510 bzero(&vlr, sizeof(vlr)); 1511 VLAN_LOCK(); 1512 if (TRUNK(ifv) != NULL) { 1513 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1514 sizeof(vlr.vlr_parent)); 1515 vlr.vlr_tag = ifv->ifv_tag; 1516 } 1517 VLAN_UNLOCK(); 1518 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1519 break; 1520 1521 case SIOCSIFFLAGS: 1522 /* 1523 * We should propagate selected flags to the parent, 1524 * e.g., promiscuous mode. 1525 */ 1526 if (TRUNK(ifv) != NULL) 1527 error = vlan_setflags(ifp, 1); 1528 break; 1529 1530 case SIOCADDMULTI: 1531 case SIOCDELMULTI: 1532 /* 1533 * If we don't have a parent, just remember the membership for 1534 * when we do. 1535 */ 1536 if (TRUNK(ifv) != NULL) 1537 error = vlan_setmulti(ifp); 1538 break; 1539 1540 default: 1541 error = ether_ioctl(ifp, cmd, data); 1542 } 1543 1544 return (error); 1545 }
Cache object: 1eab5641917d9c14c977c4e3d18ca9b0
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