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("$FreeBSD$"); 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_dl.h> 65 #include <net/if_types.h> 66 #include <net/if_vlan_var.h> 67 #include <net/vnet.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 #define UP_AND_RUNNING(ifp) \ 79 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 80 81 LIST_HEAD(ifvlanhead, ifvlan); 82 83 struct ifvlantrunk { 84 struct ifnet *parent; /* parent interface of this trunk */ 85 struct rwlock rw; 86 #ifdef VLAN_ARRAY 87 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 88 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 89 #else 90 struct ifvlanhead *hash; /* dynamic hash-list table */ 91 uint16_t hmask; 92 uint16_t hwidth; 93 #endif 94 int refcnt; 95 }; 96 97 struct vlan_mc_entry { 98 struct ether_addr mc_addr; 99 SLIST_ENTRY(vlan_mc_entry) mc_entries; 100 }; 101 102 struct ifvlan { 103 struct ifvlantrunk *ifv_trunk; 104 struct ifnet *ifv_ifp; 105 #define TRUNK(ifv) ((ifv)->ifv_trunk) 106 #define PARENT(ifv) ((ifv)->ifv_trunk->parent) 107 int ifv_pflags; /* special flags we have set on parent */ 108 struct ifv_linkmib { 109 int ifvm_encaplen; /* encapsulation length */ 110 int ifvm_mtufudge; /* MTU fudged by this much */ 111 int ifvm_mintu; /* min transmission unit */ 112 uint16_t ifvm_proto; /* encapsulation ethertype */ 113 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 114 } ifv_mib; 115 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 116 #ifndef VLAN_ARRAY 117 LIST_ENTRY(ifvlan) ifv_list; 118 #endif 119 }; 120 #define ifv_proto ifv_mib.ifvm_proto 121 #define ifv_tag ifv_mib.ifvm_tag 122 #define ifv_encaplen ifv_mib.ifvm_encaplen 123 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 124 #define ifv_mintu ifv_mib.ifvm_mintu 125 126 /* Special flags we should propagate to parent. */ 127 static struct { 128 int flag; 129 int (*func)(struct ifnet *, int); 130 } vlan_pflags[] = { 131 {IFF_PROMISC, ifpromisc}, 132 {IFF_ALLMULTI, if_allmulti}, 133 {0, NULL} 134 }; 135 136 SYSCTL_DECL(_net_link); 137 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 138 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 139 140 static int soft_pad = 0; 141 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 142 "pad short frames before tagging"); 143 144 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 145 146 static eventhandler_tag ifdetach_tag; 147 static eventhandler_tag iflladdr_tag; 148 149 /* 150 * We have a global mutex, that is used to serialize configuration 151 * changes and isn't used in normal packet delivery. 152 * 153 * We also have a per-trunk rwlock, that is locked shared on packet 154 * processing and exclusive when configuration is changed. 155 * 156 * The VLAN_ARRAY substitutes the dynamic hash with a static array 157 * with 4096 entries. In theory this can give a boost in processing, 158 * however on practice it does not. Probably this is because array 159 * is too big to fit into CPU cache. 160 */ 161 static struct mtx ifv_mtx; 162 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 163 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 164 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 165 #define VLAN_LOCK() mtx_lock(&ifv_mtx) 166 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 167 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 168 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 169 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 170 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 171 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 172 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 173 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 174 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 175 176 #ifndef VLAN_ARRAY 177 static void vlan_inithash(struct ifvlantrunk *trunk); 178 static void vlan_freehash(struct ifvlantrunk *trunk); 179 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 180 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 181 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 182 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 183 uint16_t tag); 184 #endif 185 static void trunk_destroy(struct ifvlantrunk *trunk); 186 187 static void vlan_init(void *foo); 188 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 189 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 190 static void vlan_qflush(struct ifnet *ifp); 191 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 192 int (*func)(struct ifnet *, int)); 193 static int vlan_setflags(struct ifnet *ifp, int status); 194 static int vlan_setmulti(struct ifnet *ifp); 195 static int vlan_transmit(struct ifnet *ifp, struct mbuf *m); 196 static void vlan_unconfig(struct ifnet *ifp); 197 static void vlan_unconfig_locked(struct ifnet *ifp, int departing); 198 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 199 static void vlan_link_state(struct ifnet *ifp, int link); 200 static void vlan_capabilities(struct ifvlan *ifv); 201 static void vlan_trunk_capabilities(struct ifnet *ifp); 202 203 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 204 const char *, int *); 205 static int vlan_clone_match(struct if_clone *, const char *); 206 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 207 static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 208 209 static void vlan_ifdetach(void *arg, struct ifnet *ifp); 210 static void vlan_iflladdr(void *arg, struct ifnet *ifp); 211 212 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 213 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 214 215 #ifdef VIMAGE 216 static VNET_DEFINE(struct if_clone, vlan_cloner); 217 #define V_vlan_cloner VNET(vlan_cloner) 218 #endif 219 220 #ifndef VLAN_ARRAY 221 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 222 223 static void 224 vlan_inithash(struct ifvlantrunk *trunk) 225 { 226 int i, n; 227 228 /* 229 * The trunk must not be locked here since we call malloc(M_WAITOK). 230 * It is OK in case this function is called before the trunk struct 231 * gets hooked up and becomes visible from other threads. 232 */ 233 234 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 235 ("%s: hash already initialized", __func__)); 236 237 trunk->hwidth = VLAN_DEF_HWIDTH; 238 n = 1 << trunk->hwidth; 239 trunk->hmask = n - 1; 240 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 241 for (i = 0; i < n; i++) 242 LIST_INIT(&trunk->hash[i]); 243 } 244 245 static void 246 vlan_freehash(struct ifvlantrunk *trunk) 247 { 248 #ifdef INVARIANTS 249 int i; 250 251 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 252 for (i = 0; i < (1 << trunk->hwidth); i++) 253 KASSERT(LIST_EMPTY(&trunk->hash[i]), 254 ("%s: hash table not empty", __func__)); 255 #endif 256 free(trunk->hash, M_VLAN); 257 trunk->hash = NULL; 258 trunk->hwidth = trunk->hmask = 0; 259 } 260 261 static int 262 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 263 { 264 int i, b; 265 struct ifvlan *ifv2; 266 267 TRUNK_LOCK_ASSERT(trunk); 268 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 269 270 b = 1 << trunk->hwidth; 271 i = HASH(ifv->ifv_tag, trunk->hmask); 272 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 273 if (ifv->ifv_tag == ifv2->ifv_tag) 274 return (EEXIST); 275 276 /* 277 * Grow the hash when the number of vlans exceeds half of the number of 278 * hash buckets squared. This will make the average linked-list length 279 * buckets/2. 280 */ 281 if (trunk->refcnt > (b * b) / 2) { 282 vlan_growhash(trunk, 1); 283 i = HASH(ifv->ifv_tag, trunk->hmask); 284 } 285 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 286 trunk->refcnt++; 287 288 return (0); 289 } 290 291 static int 292 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 293 { 294 int i, b; 295 struct ifvlan *ifv2; 296 297 TRUNK_LOCK_ASSERT(trunk); 298 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 299 300 b = 1 << trunk->hwidth; 301 i = HASH(ifv->ifv_tag, trunk->hmask); 302 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 303 if (ifv2 == ifv) { 304 trunk->refcnt--; 305 LIST_REMOVE(ifv2, ifv_list); 306 if (trunk->refcnt < (b * b) / 2) 307 vlan_growhash(trunk, -1); 308 return (0); 309 } 310 311 panic("%s: vlan not found\n", __func__); 312 return (ENOENT); /*NOTREACHED*/ 313 } 314 315 /* 316 * Grow the hash larger or smaller if memory permits. 317 */ 318 static void 319 vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 320 { 321 struct ifvlan *ifv; 322 struct ifvlanhead *hash2; 323 int hwidth2, i, j, n, n2; 324 325 TRUNK_LOCK_ASSERT(trunk); 326 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 327 328 if (howmuch == 0) { 329 /* Harmless yet obvious coding error */ 330 printf("%s: howmuch is 0\n", __func__); 331 return; 332 } 333 334 hwidth2 = trunk->hwidth + howmuch; 335 n = 1 << trunk->hwidth; 336 n2 = 1 << hwidth2; 337 /* Do not shrink the table below the default */ 338 if (hwidth2 < VLAN_DEF_HWIDTH) 339 return; 340 341 /* M_NOWAIT because we're called with trunk mutex held */ 342 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 343 if (hash2 == NULL) { 344 printf("%s: out of memory -- hash size not changed\n", 345 __func__); 346 return; /* We can live with the old hash table */ 347 } 348 for (j = 0; j < n2; j++) 349 LIST_INIT(&hash2[j]); 350 for (i = 0; i < n; i++) 351 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 352 LIST_REMOVE(ifv, ifv_list); 353 j = HASH(ifv->ifv_tag, n2 - 1); 354 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 355 } 356 free(trunk->hash, M_VLAN); 357 trunk->hash = hash2; 358 trunk->hwidth = hwidth2; 359 trunk->hmask = n2 - 1; 360 361 if (bootverbose) 362 if_printf(trunk->parent, 363 "VLAN hash table resized from %d to %d buckets\n", n, n2); 364 } 365 366 static __inline struct ifvlan * 367 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 368 { 369 struct ifvlan *ifv; 370 371 TRUNK_LOCK_RASSERT(trunk); 372 373 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 374 if (ifv->ifv_tag == tag) 375 return (ifv); 376 return (NULL); 377 } 378 379 #if 0 380 /* Debugging code to view the hashtables. */ 381 static void 382 vlan_dumphash(struct ifvlantrunk *trunk) 383 { 384 int i; 385 struct ifvlan *ifv; 386 387 for (i = 0; i < (1 << trunk->hwidth); i++) { 388 printf("%d: ", i); 389 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 390 printf("%s ", ifv->ifv_ifp->if_xname); 391 printf("\n"); 392 } 393 } 394 #endif /* 0 */ 395 #endif /* !VLAN_ARRAY */ 396 397 static void 398 trunk_destroy(struct ifvlantrunk *trunk) 399 { 400 VLAN_LOCK_ASSERT(); 401 402 TRUNK_LOCK(trunk); 403 #ifndef VLAN_ARRAY 404 vlan_freehash(trunk); 405 #endif 406 trunk->parent->if_vlantrunk = NULL; 407 TRUNK_UNLOCK(trunk); 408 TRUNK_LOCK_DESTROY(trunk); 409 free(trunk, M_VLAN); 410 } 411 412 /* 413 * Program our multicast filter. What we're actually doing is 414 * programming the multicast filter of the parent. This has the 415 * side effect of causing the parent interface to receive multicast 416 * traffic that it doesn't really want, which ends up being discarded 417 * later by the upper protocol layers. Unfortunately, there's no way 418 * to avoid this: there really is only one physical interface. 419 * 420 * XXX: There is a possible race here if more than one thread is 421 * modifying the multicast state of the vlan interface at the same time. 422 */ 423 static int 424 vlan_setmulti(struct ifnet *ifp) 425 { 426 struct ifnet *ifp_p; 427 struct ifmultiaddr *ifma, *rifma = NULL; 428 struct ifvlan *sc; 429 struct vlan_mc_entry *mc; 430 struct sockaddr_dl sdl; 431 int error; 432 433 /*VLAN_LOCK_ASSERT();*/ 434 435 /* Find the parent. */ 436 sc = ifp->if_softc; 437 ifp_p = PARENT(sc); 438 439 CURVNET_SET_QUIET(ifp_p->if_vnet); 440 441 bzero((char *)&sdl, sizeof(sdl)); 442 sdl.sdl_len = sizeof(sdl); 443 sdl.sdl_family = AF_LINK; 444 sdl.sdl_index = ifp_p->if_index; 445 sdl.sdl_type = IFT_ETHER; 446 sdl.sdl_alen = ETHER_ADDR_LEN; 447 448 /* First, remove any existing filter entries. */ 449 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 450 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 451 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 452 if (error) 453 return (error); 454 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 455 free(mc, M_VLAN); 456 } 457 458 /* Now program new ones. */ 459 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 460 if (ifma->ifma_addr->sa_family != AF_LINK) 461 continue; 462 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 463 if (mc == NULL) 464 return (ENOMEM); 465 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 466 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 467 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 468 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 469 LLADDR(&sdl), ETHER_ADDR_LEN); 470 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 471 if (error) 472 return (error); 473 } 474 475 CURVNET_RESTORE(); 476 return (0); 477 } 478 479 /* 480 * A handler for parent interface link layer address changes. 481 * If the parent interface link layer address is changed we 482 * should also change it on all children vlans. 483 */ 484 static void 485 vlan_iflladdr(void *arg __unused, struct ifnet *ifp) 486 { 487 struct ifvlan *ifv; 488 #ifndef VLAN_ARRAY 489 struct ifvlan *next; 490 #endif 491 int i; 492 493 /* 494 * Check if it's a trunk interface first of all 495 * to avoid needless locking. 496 */ 497 if (ifp->if_vlantrunk == NULL) 498 return; 499 500 VLAN_LOCK(); 501 /* 502 * OK, it's a trunk. Loop over and change all vlan's lladdrs on it. 503 */ 504 #ifdef VLAN_ARRAY 505 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 506 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 507 #else /* VLAN_ARRAY */ 508 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 509 LIST_FOREACH_SAFE(ifv, &ifp->if_vlantrunk->hash[i], ifv_list, next) { 510 #endif /* VLAN_ARRAY */ 511 VLAN_UNLOCK(); 512 if_setlladdr(ifv->ifv_ifp, IF_LLADDR(ifp), ETHER_ADDR_LEN); 513 VLAN_LOCK(); 514 } 515 VLAN_UNLOCK(); 516 517 } 518 519 /* 520 * A handler for network interface departure events. 521 * Track departure of trunks here so that we don't access invalid 522 * pointers or whatever if a trunk is ripped from under us, e.g., 523 * by ejecting its hot-plug card. However, if an ifnet is simply 524 * being renamed, then there's no need to tear down the state. 525 */ 526 static void 527 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 528 { 529 struct ifvlan *ifv; 530 int i; 531 532 /* 533 * Check if it's a trunk interface first of all 534 * to avoid needless locking. 535 */ 536 if (ifp->if_vlantrunk == NULL) 537 return; 538 539 /* If the ifnet is just being renamed, don't do anything. */ 540 if (ifp->if_flags & IFF_RENAMING) 541 return; 542 543 VLAN_LOCK(); 544 /* 545 * OK, it's a trunk. Loop over and detach all vlan's on it. 546 * Check trunk pointer after each vlan_unconfig() as it will 547 * free it and set to NULL after the last vlan was detached. 548 */ 549 #ifdef VLAN_ARRAY 550 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 551 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 552 vlan_unconfig_locked(ifv->ifv_ifp, 1); 553 if (ifp->if_vlantrunk == NULL) 554 break; 555 } 556 #else /* VLAN_ARRAY */ 557 restart: 558 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 559 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 560 vlan_unconfig_locked(ifv->ifv_ifp, 1); 561 if (ifp->if_vlantrunk) 562 goto restart; /* trunk->hwidth can change */ 563 else 564 break; 565 } 566 #endif /* VLAN_ARRAY */ 567 /* Trunk should have been destroyed in vlan_unconfig(). */ 568 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 569 VLAN_UNLOCK(); 570 } 571 572 /* 573 * VLAN support can be loaded as a module. The only place in the 574 * system that's intimately aware of this is ether_input. We hook 575 * into this code through vlan_input_p which is defined there and 576 * set here. Noone else in the system should be aware of this so 577 * we use an explicit reference here. 578 */ 579 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 580 581 /* For if_link_state_change() eyes only... */ 582 extern void (*vlan_link_state_p)(struct ifnet *, int); 583 584 static int 585 vlan_modevent(module_t mod, int type, void *data) 586 { 587 588 switch (type) { 589 case MOD_LOAD: 590 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 591 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 592 if (ifdetach_tag == NULL) 593 return (ENOMEM); 594 iflladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 595 vlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 596 if (iflladdr_tag == NULL) 597 return (ENOMEM); 598 VLAN_LOCK_INIT(); 599 vlan_input_p = vlan_input; 600 vlan_link_state_p = vlan_link_state; 601 vlan_trunk_cap_p = vlan_trunk_capabilities; 602 #ifndef VIMAGE 603 if_clone_attach(&vlan_cloner); 604 #endif 605 if (bootverbose) 606 printf("vlan: initialized, using " 607 #ifdef VLAN_ARRAY 608 "full-size arrays" 609 #else 610 "hash tables with chaining" 611 #endif 612 613 "\n"); 614 break; 615 case MOD_UNLOAD: 616 #ifndef VIMAGE 617 if_clone_detach(&vlan_cloner); 618 #endif 619 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 620 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_tag); 621 vlan_input_p = NULL; 622 vlan_link_state_p = NULL; 623 vlan_trunk_cap_p = NULL; 624 VLAN_LOCK_DESTROY(); 625 if (bootverbose) 626 printf("vlan: unloaded\n"); 627 break; 628 default: 629 return (EOPNOTSUPP); 630 } 631 return (0); 632 } 633 634 static moduledata_t vlan_mod = { 635 "if_vlan", 636 vlan_modevent, 637 0 638 }; 639 640 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 641 MODULE_VERSION(if_vlan, 3); 642 643 #ifdef VIMAGE 644 static void 645 vnet_vlan_init(const void *unused __unused) 646 { 647 648 V_vlan_cloner = vlan_cloner; 649 if_clone_attach(&V_vlan_cloner); 650 } 651 VNET_SYSINIT(vnet_vlan_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 652 vnet_vlan_init, NULL); 653 654 static void 655 vnet_vlan_uninit(const void *unused __unused) 656 { 657 658 if_clone_detach(&V_vlan_cloner); 659 } 660 VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, 661 vnet_vlan_uninit, NULL); 662 #endif 663 664 static struct ifnet * 665 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 666 { 667 const char *cp; 668 struct ifnet *ifp; 669 int t; 670 671 /* Check for <etherif>.<vlan> style interface names. */ 672 IFNET_RLOCK_NOSLEEP(); 673 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 674 if (ifp->if_type != IFT_ETHER) 675 continue; 676 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 677 continue; 678 cp = name + strlen(ifp->if_xname); 679 if (*cp++ != '.') 680 continue; 681 if (*cp == '\0') 682 continue; 683 t = 0; 684 for(; *cp >= '' && *cp <= '9'; cp++) 685 t = (t * 10) + (*cp - ''); 686 if (*cp != '\0') 687 continue; 688 if (tag != NULL) 689 *tag = t; 690 break; 691 } 692 IFNET_RUNLOCK_NOSLEEP(); 693 694 return (ifp); 695 } 696 697 static int 698 vlan_clone_match(struct if_clone *ifc, const char *name) 699 { 700 const char *cp; 701 702 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 703 return (1); 704 705 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 706 return (0); 707 for (cp = name + 4; *cp != '\0'; cp++) { 708 if (*cp < '' || *cp > '9') 709 return (0); 710 } 711 712 return (1); 713 } 714 715 static int 716 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 717 { 718 char *dp; 719 int wildcard; 720 int unit; 721 int error; 722 int tag; 723 int ethertag; 724 struct ifvlan *ifv; 725 struct ifnet *ifp; 726 struct ifnet *p; 727 struct vlanreq vlr; 728 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 729 730 /* 731 * There are 3 (ugh) ways to specify the cloned device: 732 * o pass a parameter block with the clone request. 733 * o specify parameters in the text of the clone device name 734 * o specify no parameters and get an unattached device that 735 * must be configured separately. 736 * The first technique is preferred; the latter two are 737 * supported for backwards compatibilty. 738 */ 739 if (params) { 740 error = copyin(params, &vlr, sizeof(vlr)); 741 if (error) 742 return error; 743 p = ifunit(vlr.vlr_parent); 744 if (p == NULL) 745 return ENXIO; 746 /* 747 * Don't let the caller set up a VLAN tag with 748 * anything except VLID bits. 749 */ 750 if (vlr.vlr_tag & ~EVL_VLID_MASK) 751 return (EINVAL); 752 error = ifc_name2unit(name, &unit); 753 if (error != 0) 754 return (error); 755 756 ethertag = 1; 757 tag = vlr.vlr_tag; 758 wildcard = (unit < 0); 759 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 760 ethertag = 1; 761 unit = -1; 762 wildcard = 0; 763 764 /* 765 * Don't let the caller set up a VLAN tag with 766 * anything except VLID bits. 767 */ 768 if (tag & ~EVL_VLID_MASK) 769 return (EINVAL); 770 } else { 771 ethertag = 0; 772 773 error = ifc_name2unit(name, &unit); 774 if (error != 0) 775 return (error); 776 777 wildcard = (unit < 0); 778 } 779 780 error = ifc_alloc_unit(ifc, &unit); 781 if (error != 0) 782 return (error); 783 784 /* In the wildcard case, we need to update the name. */ 785 if (wildcard) { 786 for (dp = name; *dp != '\0'; dp++); 787 if (snprintf(dp, len - (dp-name), "%d", unit) > 788 len - (dp-name) - 1) { 789 panic("%s: interface name too long", __func__); 790 } 791 } 792 793 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 794 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 795 if (ifp == NULL) { 796 ifc_free_unit(ifc, unit); 797 free(ifv, M_VLAN); 798 return (ENOSPC); 799 } 800 SLIST_INIT(&ifv->vlan_mc_listhead); 801 802 ifp->if_softc = ifv; 803 /* 804 * Set the name manually rather than using if_initname because 805 * we don't conform to the default naming convention for interfaces. 806 */ 807 strlcpy(ifp->if_xname, name, IFNAMSIZ); 808 ifp->if_dname = ifc->ifc_name; 809 ifp->if_dunit = unit; 810 /* NB: flags are not set here */ 811 ifp->if_linkmib = &ifv->ifv_mib; 812 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 813 /* NB: mtu is not set here */ 814 815 ifp->if_init = vlan_init; 816 ifp->if_transmit = vlan_transmit; 817 ifp->if_qflush = vlan_qflush; 818 ifp->if_ioctl = vlan_ioctl; 819 ifp->if_flags = VLAN_IFFLAGS; 820 ether_ifattach(ifp, eaddr); 821 /* Now undo some of the damage... */ 822 ifp->if_baudrate = 0; 823 ifp->if_type = IFT_L2VLAN; 824 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 825 826 if (ethertag) { 827 error = vlan_config(ifv, p, tag); 828 if (error != 0) { 829 /* 830 * Since we've partially failed, we need to back 831 * out all the way, otherwise userland could get 832 * confused. Thus, we destroy the interface. 833 */ 834 ether_ifdetach(ifp); 835 vlan_unconfig(ifp); 836 if_free_type(ifp, IFT_ETHER); 837 ifc_free_unit(ifc, unit); 838 free(ifv, M_VLAN); 839 840 return (error); 841 } 842 843 /* Update flags on the parent, if necessary. */ 844 vlan_setflags(ifp, 1); 845 } 846 847 return (0); 848 } 849 850 static int 851 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 852 { 853 struct ifvlan *ifv = ifp->if_softc; 854 int unit = ifp->if_dunit; 855 856 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 857 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 858 if_free_type(ifp, IFT_ETHER); 859 free(ifv, M_VLAN); 860 ifc_free_unit(ifc, unit); 861 862 return (0); 863 } 864 865 /* 866 * The ifp->if_init entry point for vlan(4) is a no-op. 867 */ 868 static void 869 vlan_init(void *foo __unused) 870 { 871 } 872 873 /* 874 * The if_transmit method for vlan(4) interface. 875 */ 876 static int 877 vlan_transmit(struct ifnet *ifp, struct mbuf *m) 878 { 879 struct ifvlan *ifv; 880 struct ifnet *p; 881 int error, len, mcast; 882 883 ifv = ifp->if_softc; 884 p = PARENT(ifv); 885 len = m->m_pkthdr.len; 886 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1 : 0; 887 888 BPF_MTAP(ifp, m); 889 890 /* 891 * Do not run parent's if_transmit() if the parent is not up, 892 * or parent's driver will cause a system crash. 893 */ 894 if (!UP_AND_RUNNING(p)) { 895 m_freem(m); 896 ifp->if_oerrors++; 897 return (0); 898 } 899 900 /* 901 * Pad the frame to the minimum size allowed if told to. 902 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 903 * paragraph C.4.4.3.b. It can help to work around buggy 904 * bridges that violate paragraph C.4.4.3.a from the same 905 * document, i.e., fail to pad short frames after untagging. 906 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 907 * untagging it will produce a 62-byte frame, which is a runt 908 * and requires padding. There are VLAN-enabled network 909 * devices that just discard such runts instead or mishandle 910 * them somehow. 911 */ 912 if (soft_pad) { 913 static char pad[8]; /* just zeros */ 914 int n; 915 916 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 917 n > 0; n -= sizeof(pad)) 918 if (!m_append(m, min(n, sizeof(pad)), pad)) 919 break; 920 921 if (n > 0) { 922 if_printf(ifp, "cannot pad short frame\n"); 923 ifp->if_oerrors++; 924 m_freem(m); 925 return (0); 926 } 927 } 928 929 /* 930 * If underlying interface can do VLAN tag insertion itself, 931 * just pass the packet along. However, we need some way to 932 * tell the interface where the packet came from so that it 933 * knows how to find the VLAN tag to use, so we attach a 934 * packet tag that holds it. 935 */ 936 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 937 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 938 m->m_flags |= M_VLANTAG; 939 } else { 940 m = ether_vlanencap(m, ifv->ifv_tag); 941 if (m == NULL) { 942 if_printf(ifp, "unable to prepend VLAN header\n"); 943 ifp->if_oerrors++; 944 return (0); 945 } 946 } 947 948 /* 949 * Send it, precisely as ether_output() would have. 950 */ 951 error = (p->if_transmit)(p, m); 952 if (!error) { 953 ifp->if_opackets++; 954 ifp->if_omcasts += mcast; 955 ifp->if_obytes += len; 956 } else 957 ifp->if_oerrors++; 958 return (error); 959 } 960 961 /* 962 * The ifp->if_qflush entry point for vlan(4) is a no-op. 963 */ 964 static void 965 vlan_qflush(struct ifnet *ifp __unused) 966 { 967 } 968 969 static void 970 vlan_input(struct ifnet *ifp, struct mbuf *m) 971 { 972 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 973 struct ifvlan *ifv; 974 uint16_t tag; 975 976 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 977 978 if (m->m_flags & M_VLANTAG) { 979 /* 980 * Packet is tagged, but m contains a normal 981 * Ethernet frame; the tag is stored out-of-band. 982 */ 983 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 984 m->m_flags &= ~M_VLANTAG; 985 } else { 986 struct ether_vlan_header *evl; 987 988 /* 989 * Packet is tagged in-band as specified by 802.1q. 990 */ 991 switch (ifp->if_type) { 992 case IFT_ETHER: 993 if (m->m_len < sizeof(*evl) && 994 (m = m_pullup(m, sizeof(*evl))) == NULL) { 995 if_printf(ifp, "cannot pullup VLAN header\n"); 996 return; 997 } 998 evl = mtod(m, struct ether_vlan_header *); 999 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 1000 1001 /* 1002 * Remove the 802.1q header by copying the Ethernet 1003 * addresses over it and adjusting the beginning of 1004 * the data in the mbuf. The encapsulated Ethernet 1005 * type field is already in place. 1006 */ 1007 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 1008 ETHER_HDR_LEN - ETHER_TYPE_LEN); 1009 m_adj(m, ETHER_VLAN_ENCAP_LEN); 1010 break; 1011 1012 default: 1013 #ifdef INVARIANTS 1014 panic("%s: %s has unsupported if_type %u", 1015 __func__, ifp->if_xname, ifp->if_type); 1016 #endif 1017 m_freem(m); 1018 ifp->if_noproto++; 1019 return; 1020 } 1021 } 1022 1023 TRUNK_RLOCK(trunk); 1024 #ifdef VLAN_ARRAY 1025 ifv = trunk->vlans[tag]; 1026 #else 1027 ifv = vlan_gethash(trunk, tag); 1028 #endif 1029 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 1030 TRUNK_RUNLOCK(trunk); 1031 m_freem(m); 1032 ifp->if_noproto++; 1033 return; 1034 } 1035 TRUNK_RUNLOCK(trunk); 1036 1037 m->m_pkthdr.rcvif = ifv->ifv_ifp; 1038 ifv->ifv_ifp->if_ipackets++; 1039 1040 /* Pass it back through the parent's input routine. */ 1041 (*ifp->if_input)(ifv->ifv_ifp, m); 1042 } 1043 1044 static int 1045 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 1046 { 1047 struct ifvlantrunk *trunk; 1048 struct ifnet *ifp; 1049 int error = 0; 1050 1051 /* VID numbers 0x0 and 0xFFF are reserved */ 1052 if (tag == 0 || tag == 0xFFF) 1053 return (EINVAL); 1054 if (p->if_type != IFT_ETHER) 1055 return (EPROTONOSUPPORT); 1056 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 1057 return (EPROTONOSUPPORT); 1058 if (ifv->ifv_trunk) 1059 return (EBUSY); 1060 1061 if (p->if_vlantrunk == NULL) { 1062 trunk = malloc(sizeof(struct ifvlantrunk), 1063 M_VLAN, M_WAITOK | M_ZERO); 1064 #ifndef VLAN_ARRAY 1065 vlan_inithash(trunk); 1066 #endif 1067 VLAN_LOCK(); 1068 if (p->if_vlantrunk != NULL) { 1069 /* A race that that is very unlikely to be hit. */ 1070 #ifndef VLAN_ARRAY 1071 vlan_freehash(trunk); 1072 #endif 1073 free(trunk, M_VLAN); 1074 goto exists; 1075 } 1076 TRUNK_LOCK_INIT(trunk); 1077 TRUNK_LOCK(trunk); 1078 p->if_vlantrunk = trunk; 1079 trunk->parent = p; 1080 } else { 1081 VLAN_LOCK(); 1082 exists: 1083 trunk = p->if_vlantrunk; 1084 TRUNK_LOCK(trunk); 1085 } 1086 1087 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1088 #ifdef VLAN_ARRAY 1089 if (trunk->vlans[tag] != NULL) { 1090 error = EEXIST; 1091 goto done; 1092 } 1093 trunk->vlans[tag] = ifv; 1094 trunk->refcnt++; 1095 #else 1096 error = vlan_inshash(trunk, ifv); 1097 if (error) 1098 goto done; 1099 #endif 1100 ifv->ifv_proto = ETHERTYPE_VLAN; 1101 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1102 ifv->ifv_mintu = ETHERMIN; 1103 ifv->ifv_pflags = 0; 1104 1105 /* 1106 * If the parent supports the VLAN_MTU capability, 1107 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1108 * use it. 1109 */ 1110 if (p->if_capenable & IFCAP_VLAN_MTU) { 1111 /* 1112 * No need to fudge the MTU since the parent can 1113 * handle extended frames. 1114 */ 1115 ifv->ifv_mtufudge = 0; 1116 } else { 1117 /* 1118 * Fudge the MTU by the encapsulation size. This 1119 * makes us incompatible with strictly compliant 1120 * 802.1Q implementations, but allows us to use 1121 * the feature with other NetBSD implementations, 1122 * which might still be useful. 1123 */ 1124 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1125 } 1126 1127 ifv->ifv_trunk = trunk; 1128 ifp = ifv->ifv_ifp; 1129 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1130 ifp->if_baudrate = p->if_baudrate; 1131 /* 1132 * Copy only a selected subset of flags from the parent. 1133 * Other flags are none of our business. 1134 */ 1135 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1136 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1137 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1138 #undef VLAN_COPY_FLAGS 1139 1140 ifp->if_link_state = p->if_link_state; 1141 1142 vlan_capabilities(ifv); 1143 1144 /* 1145 * Set up our ``Ethernet address'' to reflect the underlying 1146 * physical interface's. 1147 */ 1148 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1149 1150 /* 1151 * Configure multicast addresses that may already be 1152 * joined on the vlan device. 1153 */ 1154 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1155 1156 /* We are ready for operation now. */ 1157 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1158 done: 1159 TRUNK_UNLOCK(trunk); 1160 if (error == 0) 1161 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1162 VLAN_UNLOCK(); 1163 1164 return (error); 1165 } 1166 1167 static void 1168 vlan_unconfig(struct ifnet *ifp) 1169 { 1170 1171 VLAN_LOCK(); 1172 vlan_unconfig_locked(ifp, 0); 1173 VLAN_UNLOCK(); 1174 } 1175 1176 static void 1177 vlan_unconfig_locked(struct ifnet *ifp, int departing) 1178 { 1179 struct ifvlantrunk *trunk; 1180 struct vlan_mc_entry *mc; 1181 struct ifvlan *ifv; 1182 struct ifnet *parent; 1183 int error; 1184 1185 VLAN_LOCK_ASSERT(); 1186 1187 ifv = ifp->if_softc; 1188 trunk = ifv->ifv_trunk; 1189 parent = NULL; 1190 1191 if (trunk != NULL) { 1192 struct sockaddr_dl sdl; 1193 1194 TRUNK_LOCK(trunk); 1195 parent = trunk->parent; 1196 1197 /* 1198 * Since the interface is being unconfigured, we need to 1199 * empty the list of multicast groups that we may have joined 1200 * while we were alive from the parent's list. 1201 */ 1202 bzero((char *)&sdl, sizeof(sdl)); 1203 sdl.sdl_len = sizeof(sdl); 1204 sdl.sdl_family = AF_LINK; 1205 sdl.sdl_index = parent->if_index; 1206 sdl.sdl_type = IFT_ETHER; 1207 sdl.sdl_alen = ETHER_ADDR_LEN; 1208 1209 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1210 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1211 ETHER_ADDR_LEN); 1212 1213 /* 1214 * If the parent interface is being detached, 1215 * all its multicast addresses have already 1216 * been removed. Warn about errors if 1217 * if_delmulti() does fail, but don't abort as 1218 * all callers expect vlan destruction to 1219 * succeed. 1220 */ 1221 if (!departing) { 1222 error = if_delmulti(parent, 1223 (struct sockaddr *)&sdl); 1224 if (error) 1225 if_printf(ifp, 1226 "Failed to delete multicast address from parent: %d\n", 1227 error); 1228 } 1229 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1230 free(mc, M_VLAN); 1231 } 1232 1233 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1234 #ifdef VLAN_ARRAY 1235 trunk->vlans[ifv->ifv_tag] = NULL; 1236 trunk->refcnt--; 1237 #else 1238 vlan_remhash(trunk, ifv); 1239 #endif 1240 ifv->ifv_trunk = NULL; 1241 1242 /* 1243 * Check if we were the last. 1244 */ 1245 if (trunk->refcnt == 0) { 1246 trunk->parent->if_vlantrunk = NULL; 1247 /* 1248 * XXXGL: If some ithread has already entered 1249 * vlan_input() and is now blocked on the trunk 1250 * lock, then it should preempt us right after 1251 * unlock and finish its work. Then we will acquire 1252 * lock again in trunk_destroy(). 1253 */ 1254 TRUNK_UNLOCK(trunk); 1255 trunk_destroy(trunk); 1256 } else 1257 TRUNK_UNLOCK(trunk); 1258 } 1259 1260 /* Disconnect from parent. */ 1261 if (ifv->ifv_pflags) 1262 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1263 ifp->if_mtu = ETHERMTU; 1264 ifp->if_link_state = LINK_STATE_UNKNOWN; 1265 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1266 1267 /* 1268 * Only dispatch an event if vlan was 1269 * attached, otherwise there is nothing 1270 * to cleanup anyway. 1271 */ 1272 if (parent != NULL) 1273 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1274 } 1275 1276 /* Handle a reference counted flag that should be set on the parent as well */ 1277 static int 1278 vlan_setflag(struct ifnet *ifp, int flag, int status, 1279 int (*func)(struct ifnet *, int)) 1280 { 1281 struct ifvlan *ifv; 1282 int error; 1283 1284 /* XXX VLAN_LOCK_ASSERT(); */ 1285 1286 ifv = ifp->if_softc; 1287 status = status ? (ifp->if_flags & flag) : 0; 1288 /* Now "status" contains the flag value or 0 */ 1289 1290 /* 1291 * See if recorded parent's status is different from what 1292 * we want it to be. If it is, flip it. We record parent's 1293 * status in ifv_pflags so that we won't clear parent's flag 1294 * we haven't set. In fact, we don't clear or set parent's 1295 * flags directly, but get or release references to them. 1296 * That's why we can be sure that recorded flags still are 1297 * in accord with actual parent's flags. 1298 */ 1299 if (status != (ifv->ifv_pflags & flag)) { 1300 error = (*func)(PARENT(ifv), status); 1301 if (error) 1302 return (error); 1303 ifv->ifv_pflags &= ~flag; 1304 ifv->ifv_pflags |= status; 1305 } 1306 return (0); 1307 } 1308 1309 /* 1310 * Handle IFF_* flags that require certain changes on the parent: 1311 * if "status" is true, update parent's flags respective to our if_flags; 1312 * if "status" is false, forcedly clear the flags set on parent. 1313 */ 1314 static int 1315 vlan_setflags(struct ifnet *ifp, int status) 1316 { 1317 int error, i; 1318 1319 for (i = 0; vlan_pflags[i].flag; i++) { 1320 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1321 status, vlan_pflags[i].func); 1322 if (error) 1323 return (error); 1324 } 1325 return (0); 1326 } 1327 1328 /* Inform all vlans that their parent has changed link state */ 1329 static void 1330 vlan_link_state(struct ifnet *ifp, int link) 1331 { 1332 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1333 struct ifvlan *ifv; 1334 int i; 1335 1336 TRUNK_LOCK(trunk); 1337 #ifdef VLAN_ARRAY 1338 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1339 if (trunk->vlans[i] != NULL) { 1340 ifv = trunk->vlans[i]; 1341 #else 1342 for (i = 0; i < (1 << trunk->hwidth); i++) 1343 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1344 #endif 1345 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1346 if_link_state_change(ifv->ifv_ifp, 1347 trunk->parent->if_link_state); 1348 } 1349 TRUNK_UNLOCK(trunk); 1350 } 1351 1352 static void 1353 vlan_capabilities(struct ifvlan *ifv) 1354 { 1355 struct ifnet *p = PARENT(ifv); 1356 struct ifnet *ifp = ifv->ifv_ifp; 1357 1358 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1359 1360 /* 1361 * If the parent interface can do checksum offloading 1362 * on VLANs, then propagate its hardware-assisted 1363 * checksumming flags. Also assert that checksum 1364 * offloading requires hardware VLAN tagging. 1365 */ 1366 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1367 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1368 1369 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1370 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1371 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1372 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1373 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1374 } else { 1375 ifp->if_capenable = 0; 1376 ifp->if_hwassist = 0; 1377 } 1378 /* 1379 * If the parent interface can do TSO on VLANs then 1380 * propagate the hardware-assisted flag. TSO on VLANs 1381 * does not necessarily require hardware VLAN tagging. 1382 */ 1383 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1384 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1385 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1386 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1387 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1388 } else { 1389 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1390 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1391 } 1392 } 1393 1394 static void 1395 vlan_trunk_capabilities(struct ifnet *ifp) 1396 { 1397 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1398 struct ifvlan *ifv; 1399 int i; 1400 1401 TRUNK_LOCK(trunk); 1402 #ifdef VLAN_ARRAY 1403 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1404 if (trunk->vlans[i] != NULL) { 1405 ifv = trunk->vlans[i]; 1406 #else 1407 for (i = 0; i < (1 << trunk->hwidth); i++) { 1408 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1409 #endif 1410 vlan_capabilities(ifv); 1411 } 1412 TRUNK_UNLOCK(trunk); 1413 } 1414 1415 static int 1416 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1417 { 1418 struct ifnet *p; 1419 struct ifreq *ifr; 1420 struct ifvlan *ifv; 1421 struct vlanreq vlr; 1422 int error = 0; 1423 1424 ifr = (struct ifreq *)data; 1425 ifv = ifp->if_softc; 1426 1427 switch (cmd) { 1428 case SIOCGIFMEDIA: 1429 VLAN_LOCK(); 1430 if (TRUNK(ifv) != NULL) { 1431 p = PARENT(ifv); 1432 VLAN_UNLOCK(); 1433 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data); 1434 /* Limit the result to the parent's current config. */ 1435 if (error == 0) { 1436 struct ifmediareq *ifmr; 1437 1438 ifmr = (struct ifmediareq *)data; 1439 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1440 ifmr->ifm_count = 1; 1441 error = copyout(&ifmr->ifm_current, 1442 ifmr->ifm_ulist, 1443 sizeof(int)); 1444 } 1445 } 1446 } else { 1447 VLAN_UNLOCK(); 1448 error = EINVAL; 1449 } 1450 break; 1451 1452 case SIOCSIFMEDIA: 1453 error = EINVAL; 1454 break; 1455 1456 case SIOCSIFMTU: 1457 /* 1458 * Set the interface MTU. 1459 */ 1460 VLAN_LOCK(); 1461 if (TRUNK(ifv) != NULL) { 1462 if (ifr->ifr_mtu > 1463 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1464 ifr->ifr_mtu < 1465 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1466 error = EINVAL; 1467 else 1468 ifp->if_mtu = ifr->ifr_mtu; 1469 } else 1470 error = EINVAL; 1471 VLAN_UNLOCK(); 1472 break; 1473 1474 case SIOCSETVLAN: 1475 #ifdef VIMAGE 1476 if (ifp->if_vnet != ifp->if_home_vnet) { 1477 error = EPERM; 1478 break; 1479 } 1480 #endif 1481 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1482 if (error) 1483 break; 1484 if (vlr.vlr_parent[0] == '\0') { 1485 vlan_unconfig(ifp); 1486 break; 1487 } 1488 p = ifunit(vlr.vlr_parent); 1489 if (p == 0) { 1490 error = ENOENT; 1491 break; 1492 } 1493 /* 1494 * Don't let the caller set up a VLAN tag with 1495 * anything except VLID bits. 1496 */ 1497 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1498 error = EINVAL; 1499 break; 1500 } 1501 error = vlan_config(ifv, p, vlr.vlr_tag); 1502 if (error) 1503 break; 1504 1505 /* Update flags on the parent, if necessary. */ 1506 vlan_setflags(ifp, 1); 1507 break; 1508 1509 case SIOCGETVLAN: 1510 #ifdef VIMAGE 1511 if (ifp->if_vnet != ifp->if_home_vnet) { 1512 error = EPERM; 1513 break; 1514 } 1515 #endif 1516 bzero(&vlr, sizeof(vlr)); 1517 VLAN_LOCK(); 1518 if (TRUNK(ifv) != NULL) { 1519 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1520 sizeof(vlr.vlr_parent)); 1521 vlr.vlr_tag = ifv->ifv_tag; 1522 } 1523 VLAN_UNLOCK(); 1524 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1525 break; 1526 1527 case SIOCSIFFLAGS: 1528 /* 1529 * We should propagate selected flags to the parent, 1530 * e.g., promiscuous mode. 1531 */ 1532 if (TRUNK(ifv) != NULL) 1533 error = vlan_setflags(ifp, 1); 1534 break; 1535 1536 case SIOCADDMULTI: 1537 case SIOCDELMULTI: 1538 /* 1539 * If we don't have a parent, just remember the membership for 1540 * when we do. 1541 */ 1542 if (TRUNK(ifv) != NULL) 1543 error = vlan_setmulti(ifp); 1544 break; 1545 1546 default: 1547 error = ether_ioctl(ifp, cmd, data); 1548 } 1549 1550 return (error); 1551 }
Cache object: e19a8e64b0ba60f07a9b6a0590f6b821
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