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 * $FreeBSD$ 30 */ 31 32 /* 33 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. 34 * Might be extended some day to also handle IEEE 802.1p priority 35 * tagging. This is sort of sneaky in the implementation, since 36 * we need to pretend to be enough of an Ethernet implementation 37 * to make arp work. The way we do this is by telling everyone 38 * that we are an Ethernet, and then catch the packets that 39 * ether_output() left on our output queue when it calls 40 * if_start(), rewrite them for use by the real outgoing interface, 41 * and ask it to send them. 42 */ 43 44 #include "opt_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 67 #define VLANNAME "vlan" 68 #define VLAN_DEF_HWIDTH 4 69 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 70 71 #define UP_AND_RUNNING(ifp) \ 72 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 73 74 LIST_HEAD(ifvlanhead, ifvlan); 75 76 struct ifvlantrunk { 77 struct ifnet *parent; /* parent interface of this trunk */ 78 struct rwlock rw; 79 #ifdef VLAN_ARRAY 80 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 81 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 82 #else 83 struct ifvlanhead *hash; /* dynamic hash-list table */ 84 uint16_t hmask; 85 uint16_t hwidth; 86 #endif 87 int refcnt; 88 }; 89 90 struct vlan_mc_entry { 91 struct ether_addr mc_addr; 92 SLIST_ENTRY(vlan_mc_entry) mc_entries; 93 }; 94 95 struct ifvlan { 96 struct ifvlantrunk *ifv_trunk; 97 struct ifnet *ifv_ifp; 98 #define TRUNK(ifv) ((ifv)->ifv_trunk) 99 #define PARENT(ifv) ((ifv)->ifv_trunk->parent) 100 int ifv_pflags; /* special flags we have set on parent */ 101 struct ifv_linkmib { 102 int ifvm_encaplen; /* encapsulation length */ 103 int ifvm_mtufudge; /* MTU fudged by this much */ 104 int ifvm_mintu; /* min transmission unit */ 105 uint16_t ifvm_proto; /* encapsulation ethertype */ 106 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 107 } ifv_mib; 108 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 109 #ifndef VLAN_ARRAY 110 LIST_ENTRY(ifvlan) ifv_list; 111 #endif 112 }; 113 #define ifv_proto ifv_mib.ifvm_proto 114 #define ifv_tag ifv_mib.ifvm_tag 115 #define ifv_encaplen ifv_mib.ifvm_encaplen 116 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 117 #define ifv_mintu ifv_mib.ifvm_mintu 118 119 /* Special flags we should propagate to parent. */ 120 static struct { 121 int flag; 122 int (*func)(struct ifnet *, int); 123 } vlan_pflags[] = { 124 {IFF_PROMISC, ifpromisc}, 125 {IFF_ALLMULTI, if_allmulti}, 126 {0, NULL} 127 }; 128 129 SYSCTL_DECL(_net_link); 130 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 131 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 132 133 static int soft_pad = 0; 134 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 135 "pad short frames before tagging"); 136 137 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 138 139 static eventhandler_tag ifdetach_tag; 140 141 /* 142 * We have a global mutex, that is used to serialize configuration 143 * changes and isn't used in normal packet delivery. 144 * 145 * We also have a per-trunk rwlock, that is locked shared on packet 146 * processing and exclusive when configuration is changed. 147 * 148 * The VLAN_ARRAY substitutes the dynamic hash with a static array 149 * with 4096 entries. In theory this can give a boost in processing, 150 * however on practice it does not. Probably this is because array 151 * is too big to fit into CPU cache. 152 */ 153 static struct mtx ifv_mtx; 154 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 155 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 156 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 157 #define VLAN_LOCK() mtx_lock(&ifv_mtx) 158 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 159 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 160 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 161 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 162 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 163 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 164 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 165 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 166 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 167 168 #ifndef VLAN_ARRAY 169 static void vlan_inithash(struct ifvlantrunk *trunk); 170 static void vlan_freehash(struct ifvlantrunk *trunk); 171 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 172 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 173 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 174 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 175 uint16_t tag); 176 #endif 177 static void trunk_destroy(struct ifvlantrunk *trunk); 178 179 static void vlan_start(struct ifnet *ifp); 180 static void vlan_init(void *foo); 181 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 182 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 183 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 184 int (*func)(struct ifnet *, int)); 185 static int vlan_setflags(struct ifnet *ifp, int status); 186 static int vlan_setmulti(struct ifnet *ifp); 187 static int vlan_unconfig(struct ifnet *ifp); 188 static int vlan_unconfig_locked(struct ifnet *ifp); 189 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 190 static void vlan_link_state(struct ifnet *ifp, int link); 191 static void vlan_capabilities(struct ifvlan *ifv); 192 static void vlan_trunk_capabilities(struct ifnet *ifp); 193 194 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 195 const char *, int *); 196 static int vlan_clone_match(struct if_clone *, const char *); 197 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 198 static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 199 200 static void vlan_ifdetach(void *arg, struct ifnet *ifp); 201 202 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 203 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 204 205 #ifndef VLAN_ARRAY 206 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 207 208 static void 209 vlan_inithash(struct ifvlantrunk *trunk) 210 { 211 int i, n; 212 213 /* 214 * The trunk must not be locked here since we call malloc(M_WAITOK). 215 * It is OK in case this function is called before the trunk struct 216 * gets hooked up and becomes visible from other threads. 217 */ 218 219 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 220 ("%s: hash already initialized", __func__)); 221 222 trunk->hwidth = VLAN_DEF_HWIDTH; 223 n = 1 << trunk->hwidth; 224 trunk->hmask = n - 1; 225 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 226 for (i = 0; i < n; i++) 227 LIST_INIT(&trunk->hash[i]); 228 } 229 230 static void 231 vlan_freehash(struct ifvlantrunk *trunk) 232 { 233 #ifdef INVARIANTS 234 int i; 235 236 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 237 for (i = 0; i < (1 << trunk->hwidth); i++) 238 KASSERT(LIST_EMPTY(&trunk->hash[i]), 239 ("%s: hash table not empty", __func__)); 240 #endif 241 free(trunk->hash, M_VLAN); 242 trunk->hash = NULL; 243 trunk->hwidth = trunk->hmask = 0; 244 } 245 246 static int 247 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 248 { 249 int i, b; 250 struct ifvlan *ifv2; 251 252 TRUNK_LOCK_ASSERT(trunk); 253 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 254 255 b = 1 << trunk->hwidth; 256 i = HASH(ifv->ifv_tag, trunk->hmask); 257 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 258 if (ifv->ifv_tag == ifv2->ifv_tag) 259 return (EEXIST); 260 261 /* 262 * Grow the hash when the number of vlans exceeds half of the number of 263 * hash buckets squared. This will make the average linked-list length 264 * buckets/2. 265 */ 266 if (trunk->refcnt > (b * b) / 2) { 267 vlan_growhash(trunk, 1); 268 i = HASH(ifv->ifv_tag, trunk->hmask); 269 } 270 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 271 trunk->refcnt++; 272 273 return (0); 274 } 275 276 static int 277 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 278 { 279 int i, b; 280 struct ifvlan *ifv2; 281 282 TRUNK_LOCK_ASSERT(trunk); 283 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 284 285 b = 1 << trunk->hwidth; 286 i = HASH(ifv->ifv_tag, trunk->hmask); 287 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 288 if (ifv2 == ifv) { 289 trunk->refcnt--; 290 LIST_REMOVE(ifv2, ifv_list); 291 if (trunk->refcnt < (b * b) / 2) 292 vlan_growhash(trunk, -1); 293 return (0); 294 } 295 296 panic("%s: vlan not found\n", __func__); 297 return (ENOENT); /*NOTREACHED*/ 298 } 299 300 /* 301 * Grow the hash larger or smaller if memory permits. 302 */ 303 static void 304 vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 305 { 306 struct ifvlan *ifv; 307 struct ifvlanhead *hash2; 308 int hwidth2, i, j, n, n2; 309 310 TRUNK_LOCK_ASSERT(trunk); 311 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 312 313 if (howmuch == 0) { 314 /* Harmless yet obvious coding error */ 315 printf("%s: howmuch is 0\n", __func__); 316 return; 317 } 318 319 hwidth2 = trunk->hwidth + howmuch; 320 n = 1 << trunk->hwidth; 321 n2 = 1 << hwidth2; 322 /* Do not shrink the table below the default */ 323 if (hwidth2 < VLAN_DEF_HWIDTH) 324 return; 325 326 /* M_NOWAIT because we're called with trunk mutex held */ 327 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 328 if (hash2 == NULL) { 329 printf("%s: out of memory -- hash size not changed\n", 330 __func__); 331 return; /* We can live with the old hash table */ 332 } 333 for (j = 0; j < n2; j++) 334 LIST_INIT(&hash2[j]); 335 for (i = 0; i < n; i++) 336 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 337 LIST_REMOVE(ifv, ifv_list); 338 j = HASH(ifv->ifv_tag, n2 - 1); 339 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 340 } 341 free(trunk->hash, M_VLAN); 342 trunk->hash = hash2; 343 trunk->hwidth = hwidth2; 344 trunk->hmask = n2 - 1; 345 346 if (bootverbose) 347 if_printf(trunk->parent, 348 "VLAN hash table resized from %d to %d buckets\n", n, n2); 349 } 350 351 static __inline struct ifvlan * 352 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 353 { 354 struct ifvlan *ifv; 355 356 TRUNK_LOCK_RASSERT(trunk); 357 358 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 359 if (ifv->ifv_tag == tag) 360 return (ifv); 361 return (NULL); 362 } 363 364 #if 0 365 /* Debugging code to view the hashtables. */ 366 static void 367 vlan_dumphash(struct ifvlantrunk *trunk) 368 { 369 int i; 370 struct ifvlan *ifv; 371 372 for (i = 0; i < (1 << trunk->hwidth); i++) { 373 printf("%d: ", i); 374 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 375 printf("%s ", ifv->ifv_ifp->if_xname); 376 printf("\n"); 377 } 378 } 379 #endif /* 0 */ 380 #endif /* !VLAN_ARRAY */ 381 382 static void 383 trunk_destroy(struct ifvlantrunk *trunk) 384 { 385 VLAN_LOCK_ASSERT(); 386 387 TRUNK_LOCK(trunk); 388 #ifndef VLAN_ARRAY 389 vlan_freehash(trunk); 390 #endif 391 trunk->parent->if_vlantrunk = NULL; 392 TRUNK_UNLOCK(trunk); 393 TRUNK_LOCK_DESTROY(trunk); 394 free(trunk, M_VLAN); 395 } 396 397 /* 398 * Program our multicast filter. What we're actually doing is 399 * programming the multicast filter of the parent. This has the 400 * side effect of causing the parent interface to receive multicast 401 * traffic that it doesn't really want, which ends up being discarded 402 * later by the upper protocol layers. Unfortunately, there's no way 403 * to avoid this: there really is only one physical interface. 404 * 405 * XXX: There is a possible race here if more than one thread is 406 * modifying the multicast state of the vlan interface at the same time. 407 */ 408 static int 409 vlan_setmulti(struct ifnet *ifp) 410 { 411 struct ifnet *ifp_p; 412 struct ifmultiaddr *ifma, *rifma = NULL; 413 struct ifvlan *sc; 414 struct vlan_mc_entry *mc; 415 struct sockaddr_dl sdl; 416 int error; 417 418 /*VLAN_LOCK_ASSERT();*/ 419 420 /* Find the parent. */ 421 sc = ifp->if_softc; 422 ifp_p = PARENT(sc); 423 424 bzero((char *)&sdl, sizeof(sdl)); 425 sdl.sdl_len = sizeof(sdl); 426 sdl.sdl_family = AF_LINK; 427 sdl.sdl_index = ifp_p->if_index; 428 sdl.sdl_type = IFT_ETHER; 429 sdl.sdl_alen = ETHER_ADDR_LEN; 430 431 /* First, remove any existing filter entries. */ 432 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 433 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 434 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 435 if (error) 436 return (error); 437 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 438 free(mc, M_VLAN); 439 } 440 441 /* Now program new ones. */ 442 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 443 if (ifma->ifma_addr->sa_family != AF_LINK) 444 continue; 445 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 446 if (mc == NULL) 447 return (ENOMEM); 448 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 449 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 450 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 451 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 452 LLADDR(&sdl), ETHER_ADDR_LEN); 453 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 454 if (error) 455 return (error); 456 } 457 458 return (0); 459 } 460 461 /* 462 * A handler for network interface departure events. 463 * Track departure of trunks here so that we don't access invalid 464 * pointers or whatever if a trunk is ripped from under us, e.g., 465 * by ejecting its hot-plug card. 466 */ 467 static void 468 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 469 { 470 struct ifvlan *ifv; 471 int i; 472 473 /* 474 * Check if it's a trunk interface first of all 475 * to avoid needless locking. 476 */ 477 if (ifp->if_vlantrunk == NULL) 478 return; 479 480 VLAN_LOCK(); 481 /* 482 * OK, it's a trunk. Loop over and detach all vlan's on it. 483 * Check trunk pointer after each vlan_unconfig() as it will 484 * free it and set to NULL after the last vlan was detached. 485 */ 486 #ifdef VLAN_ARRAY 487 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 488 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 489 vlan_unconfig_locked(ifv->ifv_ifp); 490 if (ifp->if_vlantrunk == NULL) 491 break; 492 } 493 #else /* VLAN_ARRAY */ 494 restart: 495 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 496 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 497 vlan_unconfig_locked(ifv->ifv_ifp); 498 if (ifp->if_vlantrunk) 499 goto restart; /* trunk->hwidth can change */ 500 else 501 break; 502 } 503 #endif /* VLAN_ARRAY */ 504 /* Trunk should have been destroyed in vlan_unconfig(). */ 505 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 506 VLAN_UNLOCK(); 507 } 508 509 /* 510 * VLAN support can be loaded as a module. The only place in the 511 * system that's intimately aware of this is ether_input. We hook 512 * into this code through vlan_input_p which is defined there and 513 * set here. Noone else in the system should be aware of this so 514 * we use an explicit reference here. 515 */ 516 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 517 518 /* For if_link_state_change() eyes only... */ 519 extern void (*vlan_link_state_p)(struct ifnet *, int); 520 521 static int 522 vlan_modevent(module_t mod, int type, void *data) 523 { 524 525 switch (type) { 526 case MOD_LOAD: 527 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 528 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 529 if (ifdetach_tag == NULL) 530 return (ENOMEM); 531 VLAN_LOCK_INIT(); 532 vlan_input_p = vlan_input; 533 vlan_link_state_p = vlan_link_state; 534 vlan_trunk_cap_p = vlan_trunk_capabilities; 535 if_clone_attach(&vlan_cloner); 536 if (bootverbose) 537 printf("vlan: initialized, using " 538 #ifdef VLAN_ARRAY 539 "full-size arrays" 540 #else 541 "hash tables with chaining" 542 #endif 543 544 "\n"); 545 break; 546 case MOD_UNLOAD: 547 if_clone_detach(&vlan_cloner); 548 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 549 vlan_input_p = NULL; 550 vlan_link_state_p = NULL; 551 vlan_trunk_cap_p = NULL; 552 VLAN_LOCK_DESTROY(); 553 if (bootverbose) 554 printf("vlan: unloaded\n"); 555 break; 556 default: 557 return (EOPNOTSUPP); 558 } 559 return (0); 560 } 561 562 static moduledata_t vlan_mod = { 563 "if_vlan", 564 vlan_modevent, 565 0 566 }; 567 568 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 569 MODULE_VERSION(if_vlan, 3); 570 MODULE_DEPEND(if_vlan, miibus, 1, 1, 1); 571 572 static struct ifnet * 573 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 574 { 575 const char *cp; 576 struct ifnet *ifp; 577 int t = 0; 578 579 /* Check for <etherif>.<vlan> style interface names. */ 580 IFNET_RLOCK(); 581 TAILQ_FOREACH(ifp, &ifnet, if_link) { 582 if (ifp->if_type != IFT_ETHER) 583 continue; 584 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 585 continue; 586 cp = name + strlen(ifp->if_xname); 587 if (*cp != '.') 588 continue; 589 for(; *cp != '\0'; cp++) { 590 if (*cp < '' || *cp > '9') 591 continue; 592 t = (t * 10) + (*cp - ''); 593 } 594 if (tag != NULL) 595 *tag = t; 596 break; 597 } 598 IFNET_RUNLOCK(); 599 600 return (ifp); 601 } 602 603 static int 604 vlan_clone_match(struct if_clone *ifc, const char *name) 605 { 606 const char *cp; 607 608 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 609 return (1); 610 611 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 612 return (0); 613 for (cp = name + 4; *cp != '\0'; cp++) { 614 if (*cp < '' || *cp > '9') 615 return (0); 616 } 617 618 return (1); 619 } 620 621 static int 622 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 623 { 624 char *dp; 625 int wildcard; 626 int unit; 627 int error; 628 int tag; 629 int ethertag; 630 struct ifvlan *ifv; 631 struct ifnet *ifp; 632 struct ifnet *p; 633 struct vlanreq vlr; 634 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 635 636 /* 637 * There are 3 (ugh) ways to specify the cloned device: 638 * o pass a parameter block with the clone request. 639 * o specify parameters in the text of the clone device name 640 * o specify no parameters and get an unattached device that 641 * must be configured separately. 642 * The first technique is preferred; the latter two are 643 * supported for backwards compatibilty. 644 */ 645 if (params) { 646 error = copyin(params, &vlr, sizeof(vlr)); 647 if (error) 648 return error; 649 p = ifunit(vlr.vlr_parent); 650 if (p == NULL) 651 return ENXIO; 652 /* 653 * Don't let the caller set up a VLAN tag with 654 * anything except VLID bits. 655 */ 656 if (vlr.vlr_tag & ~EVL_VLID_MASK) 657 return (EINVAL); 658 error = ifc_name2unit(name, &unit); 659 if (error != 0) 660 return (error); 661 662 ethertag = 1; 663 tag = vlr.vlr_tag; 664 wildcard = (unit < 0); 665 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 666 ethertag = 1; 667 unit = -1; 668 wildcard = 0; 669 670 /* 671 * Don't let the caller set up a VLAN tag with 672 * anything except VLID bits. 673 */ 674 if (tag & ~EVL_VLID_MASK) 675 return (EINVAL); 676 } else { 677 ethertag = 0; 678 679 error = ifc_name2unit(name, &unit); 680 if (error != 0) 681 return (error); 682 683 wildcard = (unit < 0); 684 } 685 686 error = ifc_alloc_unit(ifc, &unit); 687 if (error != 0) 688 return (error); 689 690 /* In the wildcard case, we need to update the name. */ 691 if (wildcard) { 692 for (dp = name; *dp != '\0'; dp++); 693 if (snprintf(dp, len - (dp-name), "%d", unit) > 694 len - (dp-name) - 1) { 695 panic("%s: interface name too long", __func__); 696 } 697 } 698 699 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 700 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 701 if (ifp == NULL) { 702 ifc_free_unit(ifc, unit); 703 free(ifv, M_VLAN); 704 return (ENOSPC); 705 } 706 SLIST_INIT(&ifv->vlan_mc_listhead); 707 708 ifp->if_softc = ifv; 709 /* 710 * Set the name manually rather than using if_initname because 711 * we don't conform to the default naming convention for interfaces. 712 */ 713 strlcpy(ifp->if_xname, name, IFNAMSIZ); 714 ifp->if_dname = ifc->ifc_name; 715 ifp->if_dunit = unit; 716 /* NB: flags are not set here */ 717 ifp->if_linkmib = &ifv->ifv_mib; 718 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 719 /* NB: mtu is not set here */ 720 721 ifp->if_init = vlan_init; 722 ifp->if_start = vlan_start; 723 ifp->if_ioctl = vlan_ioctl; 724 ifp->if_snd.ifq_maxlen = ifqmaxlen; 725 ifp->if_flags = VLAN_IFFLAGS; 726 ether_ifattach(ifp, eaddr); 727 /* Now undo some of the damage... */ 728 ifp->if_baudrate = 0; 729 ifp->if_type = IFT_L2VLAN; 730 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 731 732 if (ethertag) { 733 error = vlan_config(ifv, p, tag); 734 if (error != 0) { 735 /* 736 * Since we've partialy failed, we need to back 737 * out all the way, otherwise userland could get 738 * confused. Thus, we destroy the interface. 739 */ 740 ether_ifdetach(ifp); 741 vlan_unconfig(ifp); 742 if_free_type(ifp, IFT_ETHER); 743 ifc_free_unit(ifc, unit); 744 free(ifv, M_VLAN); 745 746 return (error); 747 } 748 749 /* Update flags on the parent, if necessary. */ 750 vlan_setflags(ifp, 1); 751 } 752 753 return (0); 754 } 755 756 static int 757 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 758 { 759 struct ifvlan *ifv = ifp->if_softc; 760 int unit = ifp->if_dunit; 761 762 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 763 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 764 if_free_type(ifp, IFT_ETHER); 765 free(ifv, M_VLAN); 766 ifc_free_unit(ifc, unit); 767 768 return (0); 769 } 770 771 /* 772 * The ifp->if_init entry point for vlan(4) is a no-op. 773 */ 774 static void 775 vlan_init(void *foo __unused) 776 { 777 } 778 779 /* 780 * The if_start method for vlan(4) interface. It doesn't 781 * raises the IFF_DRV_OACTIVE flag, since it is called 782 * only from IFQ_HANDOFF() macro in ether_output_frame(). 783 * If the interface queue is full, and vlan_start() is 784 * not called, the queue would never get emptied and 785 * interface would stall forever. 786 */ 787 static void 788 vlan_start(struct ifnet *ifp) 789 { 790 struct ifvlan *ifv; 791 struct ifnet *p; 792 struct mbuf *m; 793 int error; 794 795 ifv = ifp->if_softc; 796 p = PARENT(ifv); 797 798 for (;;) { 799 IF_DEQUEUE(&ifp->if_snd, m); 800 if (m == NULL) 801 break; 802 BPF_MTAP(ifp, m); 803 804 /* 805 * Do not run parent's if_start() if the parent is not up, 806 * or parent's driver will cause a system crash. 807 */ 808 if (!UP_AND_RUNNING(p)) { 809 m_freem(m); 810 ifp->if_collisions++; 811 continue; 812 } 813 814 /* 815 * Pad the frame to the minimum size allowed if told to. 816 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 817 * paragraph C.4.4.3.b. It can help to work around buggy 818 * bridges that violate paragraph C.4.4.3.a from the same 819 * document, i.e., fail to pad short frames after untagging. 820 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 821 * untagging it will produce a 62-byte frame, which is a runt 822 * and requires padding. There are VLAN-enabled network 823 * devices that just discard such runts instead or mishandle 824 * them somehow. 825 */ 826 if (soft_pad) { 827 static char pad[8]; /* just zeros */ 828 int n; 829 830 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 831 n > 0; n -= sizeof(pad)) 832 if (!m_append(m, min(n, sizeof(pad)), pad)) 833 break; 834 835 if (n > 0) { 836 if_printf(ifp, "cannot pad short frame\n"); 837 ifp->if_oerrors++; 838 m_freem(m); 839 continue; 840 } 841 } 842 843 /* 844 * If underlying interface can do VLAN tag insertion itself, 845 * just pass the packet along. However, we need some way to 846 * tell the interface where the packet came from so that it 847 * knows how to find the VLAN tag to use, so we attach a 848 * packet tag that holds it. 849 */ 850 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 851 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 852 m->m_flags |= M_VLANTAG; 853 } else { 854 m = ether_vlanencap(m, ifv->ifv_tag); 855 if (m == NULL) { 856 if_printf(ifp, 857 "unable to prepend VLAN header\n"); 858 ifp->if_oerrors++; 859 continue; 860 } 861 } 862 863 /* 864 * Send it, precisely as ether_output() would have. 865 * We are already running at splimp. 866 */ 867 IFQ_HANDOFF(p, m, error); 868 if (!error) 869 ifp->if_opackets++; 870 else 871 ifp->if_oerrors++; 872 } 873 } 874 875 static void 876 vlan_input(struct ifnet *ifp, struct mbuf *m) 877 { 878 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 879 struct ifvlan *ifv; 880 uint16_t tag; 881 882 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 883 884 if (m->m_flags & M_VLANTAG) { 885 /* 886 * Packet is tagged, but m contains a normal 887 * Ethernet frame; the tag is stored out-of-band. 888 */ 889 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 890 m->m_flags &= ~M_VLANTAG; 891 } else { 892 struct ether_vlan_header *evl; 893 894 /* 895 * Packet is tagged in-band as specified by 802.1q. 896 */ 897 switch (ifp->if_type) { 898 case IFT_ETHER: 899 if (m->m_len < sizeof(*evl) && 900 (m = m_pullup(m, sizeof(*evl))) == NULL) { 901 if_printf(ifp, "cannot pullup VLAN header\n"); 902 return; 903 } 904 evl = mtod(m, struct ether_vlan_header *); 905 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 906 907 /* 908 * Remove the 802.1q header by copying the Ethernet 909 * addresses over it and adjusting the beginning of 910 * the data in the mbuf. The encapsulated Ethernet 911 * type field is already in place. 912 */ 913 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 914 ETHER_HDR_LEN - ETHER_TYPE_LEN); 915 m_adj(m, ETHER_VLAN_ENCAP_LEN); 916 break; 917 918 default: 919 #ifdef INVARIANTS 920 panic("%s: %s has unsupported if_type %u", 921 __func__, ifp->if_xname, ifp->if_type); 922 #endif 923 m_freem(m); 924 ifp->if_noproto++; 925 return; 926 } 927 } 928 929 TRUNK_RLOCK(trunk); 930 #ifdef VLAN_ARRAY 931 ifv = trunk->vlans[tag]; 932 #else 933 ifv = vlan_gethash(trunk, tag); 934 #endif 935 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 936 TRUNK_RUNLOCK(trunk); 937 m_freem(m); 938 ifp->if_noproto++; 939 return; 940 } 941 TRUNK_RUNLOCK(trunk); 942 943 m->m_pkthdr.rcvif = ifv->ifv_ifp; 944 ifv->ifv_ifp->if_ipackets++; 945 946 /* Pass it back through the parent's input routine. */ 947 (*ifp->if_input)(ifv->ifv_ifp, m); 948 } 949 950 static int 951 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 952 { 953 struct ifvlantrunk *trunk; 954 struct ifnet *ifp; 955 int error = 0; 956 957 /* VID numbers 0x0 and 0xFFF are reserved */ 958 if (tag == 0 || tag == 0xFFF) 959 return (EINVAL); 960 if (p->if_type != IFT_ETHER) 961 return (EPROTONOSUPPORT); 962 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 963 return (EPROTONOSUPPORT); 964 if (ifv->ifv_trunk) 965 return (EBUSY); 966 967 if (p->if_vlantrunk == NULL) { 968 trunk = malloc(sizeof(struct ifvlantrunk), 969 M_VLAN, M_WAITOK | M_ZERO); 970 #ifndef VLAN_ARRAY 971 vlan_inithash(trunk); 972 #endif 973 VLAN_LOCK(); 974 if (p->if_vlantrunk != NULL) { 975 /* A race that that is very unlikely to be hit. */ 976 #ifndef VLAN_ARRAY 977 vlan_freehash(trunk); 978 #endif 979 free(trunk, M_VLAN); 980 goto exists; 981 } 982 TRUNK_LOCK_INIT(trunk); 983 TRUNK_LOCK(trunk); 984 p->if_vlantrunk = trunk; 985 trunk->parent = p; 986 } else { 987 VLAN_LOCK(); 988 exists: 989 trunk = p->if_vlantrunk; 990 TRUNK_LOCK(trunk); 991 } 992 993 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 994 #ifdef VLAN_ARRAY 995 if (trunk->vlans[tag] != NULL) { 996 error = EEXIST; 997 goto done; 998 } 999 trunk->vlans[tag] = ifv; 1000 trunk->refcnt++; 1001 #else 1002 error = vlan_inshash(trunk, ifv); 1003 if (error) 1004 goto done; 1005 #endif 1006 ifv->ifv_proto = ETHERTYPE_VLAN; 1007 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1008 ifv->ifv_mintu = ETHERMIN; 1009 ifv->ifv_pflags = 0; 1010 1011 /* 1012 * If the parent supports the VLAN_MTU capability, 1013 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1014 * use it. 1015 */ 1016 if (p->if_capenable & IFCAP_VLAN_MTU) { 1017 /* 1018 * No need to fudge the MTU since the parent can 1019 * handle extended frames. 1020 */ 1021 ifv->ifv_mtufudge = 0; 1022 } else { 1023 /* 1024 * Fudge the MTU by the encapsulation size. This 1025 * makes us incompatible with strictly compliant 1026 * 802.1Q implementations, but allows us to use 1027 * the feature with other NetBSD implementations, 1028 * which might still be useful. 1029 */ 1030 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1031 } 1032 1033 ifv->ifv_trunk = trunk; 1034 ifp = ifv->ifv_ifp; 1035 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1036 ifp->if_baudrate = p->if_baudrate; 1037 /* 1038 * Copy only a selected subset of flags from the parent. 1039 * Other flags are none of our business. 1040 */ 1041 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1042 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1043 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1044 #undef VLAN_COPY_FLAGS 1045 1046 ifp->if_link_state = p->if_link_state; 1047 1048 vlan_capabilities(ifv); 1049 1050 /* 1051 * Set up our ``Ethernet address'' to reflect the underlying 1052 * physical interface's. 1053 */ 1054 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1055 1056 /* 1057 * Configure multicast addresses that may already be 1058 * joined on the vlan device. 1059 */ 1060 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1061 1062 /* We are ready for operation now. */ 1063 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1064 done: 1065 TRUNK_UNLOCK(trunk); 1066 if (error == 0) 1067 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1068 VLAN_UNLOCK(); 1069 1070 return (error); 1071 } 1072 1073 static int 1074 vlan_unconfig(struct ifnet *ifp) 1075 { 1076 int ret; 1077 1078 VLAN_LOCK(); 1079 ret = vlan_unconfig_locked(ifp); 1080 VLAN_UNLOCK(); 1081 return (ret); 1082 } 1083 1084 static int 1085 vlan_unconfig_locked(struct ifnet *ifp) 1086 { 1087 struct ifvlantrunk *trunk; 1088 struct vlan_mc_entry *mc; 1089 struct ifvlan *ifv; 1090 struct ifnet *parent; 1091 int error; 1092 1093 VLAN_LOCK_ASSERT(); 1094 1095 ifv = ifp->if_softc; 1096 trunk = ifv->ifv_trunk; 1097 parent = NULL; 1098 1099 if (trunk != NULL) { 1100 struct sockaddr_dl sdl; 1101 1102 TRUNK_LOCK(trunk); 1103 parent = trunk->parent; 1104 1105 /* 1106 * Since the interface is being unconfigured, we need to 1107 * empty the list of multicast groups that we may have joined 1108 * while we were alive from the parent's list. 1109 */ 1110 bzero((char *)&sdl, sizeof(sdl)); 1111 sdl.sdl_len = sizeof(sdl); 1112 sdl.sdl_family = AF_LINK; 1113 sdl.sdl_index = parent->if_index; 1114 sdl.sdl_type = IFT_ETHER; 1115 sdl.sdl_alen = ETHER_ADDR_LEN; 1116 1117 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1118 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1119 ETHER_ADDR_LEN); 1120 error = if_delmulti(parent, (struct sockaddr *)&sdl); 1121 if (error) 1122 return (error); 1123 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1124 free(mc, M_VLAN); 1125 } 1126 1127 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1128 #ifdef VLAN_ARRAY 1129 trunk->vlans[ifv->ifv_tag] = NULL; 1130 trunk->refcnt--; 1131 #else 1132 vlan_remhash(trunk, ifv); 1133 #endif 1134 ifv->ifv_trunk = NULL; 1135 1136 /* 1137 * Check if we were the last. 1138 */ 1139 if (trunk->refcnt == 0) { 1140 trunk->parent->if_vlantrunk = NULL; 1141 /* 1142 * XXXGL: If some ithread has already entered 1143 * vlan_input() and is now blocked on the trunk 1144 * lock, then it should preempt us right after 1145 * unlock and finish its work. Then we will acquire 1146 * lock again in trunk_destroy(). 1147 */ 1148 TRUNK_UNLOCK(trunk); 1149 trunk_destroy(trunk); 1150 } else 1151 TRUNK_UNLOCK(trunk); 1152 } 1153 1154 /* Disconnect from parent. */ 1155 if (ifv->ifv_pflags) 1156 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1157 ifp->if_mtu = ETHERMTU; 1158 ifp->if_link_state = LINK_STATE_UNKNOWN; 1159 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1160 1161 /* 1162 * Only dispatch an event if vlan was 1163 * attached, otherwise there is nothing 1164 * to cleanup anyway. 1165 */ 1166 if (parent != NULL) 1167 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1168 1169 return (0); 1170 } 1171 1172 /* Handle a reference counted flag that should be set on the parent as well */ 1173 static int 1174 vlan_setflag(struct ifnet *ifp, int flag, int status, 1175 int (*func)(struct ifnet *, int)) 1176 { 1177 struct ifvlan *ifv; 1178 int error; 1179 1180 /* XXX VLAN_LOCK_ASSERT(); */ 1181 1182 ifv = ifp->if_softc; 1183 status = status ? (ifp->if_flags & flag) : 0; 1184 /* Now "status" contains the flag value or 0 */ 1185 1186 /* 1187 * See if recorded parent's status is different from what 1188 * we want it to be. If it is, flip it. We record parent's 1189 * status in ifv_pflags so that we won't clear parent's flag 1190 * we haven't set. In fact, we don't clear or set parent's 1191 * flags directly, but get or release references to them. 1192 * That's why we can be sure that recorded flags still are 1193 * in accord with actual parent's flags. 1194 */ 1195 if (status != (ifv->ifv_pflags & flag)) { 1196 error = (*func)(PARENT(ifv), status); 1197 if (error) 1198 return (error); 1199 ifv->ifv_pflags &= ~flag; 1200 ifv->ifv_pflags |= status; 1201 } 1202 return (0); 1203 } 1204 1205 /* 1206 * Handle IFF_* flags that require certain changes on the parent: 1207 * if "status" is true, update parent's flags respective to our if_flags; 1208 * if "status" is false, forcedly clear the flags set on parent. 1209 */ 1210 static int 1211 vlan_setflags(struct ifnet *ifp, int status) 1212 { 1213 int error, i; 1214 1215 for (i = 0; vlan_pflags[i].flag; i++) { 1216 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1217 status, vlan_pflags[i].func); 1218 if (error) 1219 return (error); 1220 } 1221 return (0); 1222 } 1223 1224 /* Inform all vlans that their parent has changed link state */ 1225 static void 1226 vlan_link_state(struct ifnet *ifp, int link) 1227 { 1228 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1229 struct ifvlan *ifv; 1230 int i; 1231 1232 TRUNK_LOCK(trunk); 1233 #ifdef VLAN_ARRAY 1234 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1235 if (trunk->vlans[i] != NULL) { 1236 ifv = trunk->vlans[i]; 1237 #else 1238 for (i = 0; i < (1 << trunk->hwidth); i++) 1239 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1240 #endif 1241 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1242 if_link_state_change(ifv->ifv_ifp, 1243 trunk->parent->if_link_state); 1244 } 1245 TRUNK_UNLOCK(trunk); 1246 } 1247 1248 static void 1249 vlan_capabilities(struct ifvlan *ifv) 1250 { 1251 struct ifnet *p = PARENT(ifv); 1252 struct ifnet *ifp = ifv->ifv_ifp; 1253 1254 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1255 1256 /* 1257 * If the parent interface can do checksum offloading 1258 * on VLANs, then propagate its hardware-assisted 1259 * checksumming flags. Also assert that checksum 1260 * offloading requires hardware VLAN tagging. 1261 */ 1262 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1263 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1264 1265 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1266 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1267 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1268 ifp->if_hwassist = p->if_hwassist; 1269 } else { 1270 ifp->if_capenable = 0; 1271 ifp->if_hwassist = 0; 1272 } 1273 } 1274 1275 static void 1276 vlan_trunk_capabilities(struct ifnet *ifp) 1277 { 1278 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1279 struct ifvlan *ifv; 1280 int i; 1281 1282 TRUNK_LOCK(trunk); 1283 #ifdef VLAN_ARRAY 1284 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1285 if (trunk->vlans[i] != NULL) { 1286 ifv = trunk->vlans[i]; 1287 #else 1288 for (i = 0; i < (1 << trunk->hwidth); i++) { 1289 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1290 #endif 1291 vlan_capabilities(ifv); 1292 } 1293 TRUNK_UNLOCK(trunk); 1294 } 1295 1296 static int 1297 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1298 { 1299 struct ifnet *p; 1300 struct ifreq *ifr; 1301 struct ifvlan *ifv; 1302 struct vlanreq vlr; 1303 int error = 0; 1304 1305 ifr = (struct ifreq *)data; 1306 ifv = ifp->if_softc; 1307 1308 switch (cmd) { 1309 case SIOCGIFMEDIA: 1310 VLAN_LOCK(); 1311 if (TRUNK(ifv) != NULL) { 1312 error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv), 1313 SIOCGIFMEDIA, data); 1314 VLAN_UNLOCK(); 1315 /* Limit the result to the parent's current config. */ 1316 if (error == 0) { 1317 struct ifmediareq *ifmr; 1318 1319 ifmr = (struct ifmediareq *)data; 1320 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1321 ifmr->ifm_count = 1; 1322 error = copyout(&ifmr->ifm_current, 1323 ifmr->ifm_ulist, 1324 sizeof(int)); 1325 } 1326 } 1327 } else { 1328 VLAN_UNLOCK(); 1329 error = EINVAL; 1330 } 1331 break; 1332 1333 case SIOCSIFMEDIA: 1334 error = EINVAL; 1335 break; 1336 1337 case SIOCSIFMTU: 1338 /* 1339 * Set the interface MTU. 1340 */ 1341 VLAN_LOCK(); 1342 if (TRUNK(ifv) != NULL) { 1343 if (ifr->ifr_mtu > 1344 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1345 ifr->ifr_mtu < 1346 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1347 error = EINVAL; 1348 else 1349 ifp->if_mtu = ifr->ifr_mtu; 1350 } else 1351 error = EINVAL; 1352 VLAN_UNLOCK(); 1353 break; 1354 1355 case SIOCSETVLAN: 1356 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1357 if (error) 1358 break; 1359 if (vlr.vlr_parent[0] == '\0') { 1360 vlan_unconfig(ifp); 1361 break; 1362 } 1363 p = ifunit(vlr.vlr_parent); 1364 if (p == 0) { 1365 error = ENOENT; 1366 break; 1367 } 1368 /* 1369 * Don't let the caller set up a VLAN tag with 1370 * anything except VLID bits. 1371 */ 1372 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1373 error = EINVAL; 1374 break; 1375 } 1376 error = vlan_config(ifv, p, vlr.vlr_tag); 1377 if (error) 1378 break; 1379 1380 /* Update flags on the parent, if necessary. */ 1381 vlan_setflags(ifp, 1); 1382 break; 1383 1384 case SIOCGETVLAN: 1385 bzero(&vlr, sizeof(vlr)); 1386 VLAN_LOCK(); 1387 if (TRUNK(ifv) != NULL) { 1388 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1389 sizeof(vlr.vlr_parent)); 1390 vlr.vlr_tag = ifv->ifv_tag; 1391 } 1392 VLAN_UNLOCK(); 1393 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1394 break; 1395 1396 case SIOCSIFFLAGS: 1397 /* 1398 * We should propagate selected flags to the parent, 1399 * e.g., promiscuous mode. 1400 */ 1401 if (TRUNK(ifv) != NULL) 1402 error = vlan_setflags(ifp, 1); 1403 break; 1404 1405 case SIOCADDMULTI: 1406 case SIOCDELMULTI: 1407 /* 1408 * If we don't have a parent, just remember the membership for 1409 * when we do. 1410 */ 1411 if (TRUNK(ifv) != NULL) 1412 error = vlan_setmulti(ifp); 1413 break; 1414 1415 default: 1416 error = ether_ioctl(ifp, cmd, data); 1417 } 1418 1419 return (error); 1420 }
Cache object: d1bca428d52717e2f9257553f2fc9a47
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