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 free(ifv, M_VLAN); 744 745 return (error); 746 } 747 748 /* Update flags on the parent, if necessary. */ 749 vlan_setflags(ifp, 1); 750 } 751 752 return (0); 753 } 754 755 static int 756 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 757 { 758 struct ifvlan *ifv = ifp->if_softc; 759 int unit = ifp->if_dunit; 760 761 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 762 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 763 if_free_type(ifp, IFT_ETHER); 764 free(ifv, M_VLAN); 765 ifc_free_unit(ifc, unit); 766 767 return (0); 768 } 769 770 /* 771 * The ifp->if_init entry point for vlan(4) is a no-op. 772 */ 773 static void 774 vlan_init(void *foo __unused) 775 { 776 } 777 778 /* 779 * The if_start method for vlan(4) interface. It doesn't 780 * raises the IFF_DRV_OACTIVE flag, since it is called 781 * only from IFQ_HANDOFF() macro in ether_output_frame(). 782 * If the interface queue is full, and vlan_start() is 783 * not called, the queue would never get emptied and 784 * interface would stall forever. 785 */ 786 static void 787 vlan_start(struct ifnet *ifp) 788 { 789 struct ifvlan *ifv; 790 struct ifnet *p; 791 struct mbuf *m; 792 int error; 793 794 ifv = ifp->if_softc; 795 p = PARENT(ifv); 796 797 for (;;) { 798 IF_DEQUEUE(&ifp->if_snd, m); 799 if (m == NULL) 800 break; 801 BPF_MTAP(ifp, m); 802 803 /* 804 * Do not run parent's if_start() if the parent is not up, 805 * or parent's driver will cause a system crash. 806 */ 807 if (!UP_AND_RUNNING(p)) { 808 m_freem(m); 809 ifp->if_collisions++; 810 continue; 811 } 812 813 /* 814 * Pad the frame to the minimum size allowed if told to. 815 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 816 * paragraph C.4.4.3.b. It can help to work around buggy 817 * bridges that violate paragraph C.4.4.3.a from the same 818 * document, i.e., fail to pad short frames after untagging. 819 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 820 * untagging it will produce a 62-byte frame, which is a runt 821 * and requires padding. There are VLAN-enabled network 822 * devices that just discard such runts instead or mishandle 823 * them somehow. 824 */ 825 if (soft_pad) { 826 static char pad[8]; /* just zeros */ 827 int n; 828 829 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 830 n > 0; n -= sizeof(pad)) 831 if (!m_append(m, min(n, sizeof(pad)), pad)) 832 break; 833 834 if (n > 0) { 835 if_printf(ifp, "cannot pad short frame\n"); 836 ifp->if_oerrors++; 837 m_freem(m); 838 continue; 839 } 840 } 841 842 /* 843 * If underlying interface can do VLAN tag insertion itself, 844 * just pass the packet along. However, we need some way to 845 * tell the interface where the packet came from so that it 846 * knows how to find the VLAN tag to use, so we attach a 847 * packet tag that holds it. 848 */ 849 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 850 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 851 m->m_flags |= M_VLANTAG; 852 } else { 853 m = ether_vlanencap(m, ifv->ifv_tag); 854 if (m == NULL) { 855 if_printf(ifp, 856 "unable to prepend VLAN header\n"); 857 ifp->if_oerrors++; 858 continue; 859 } 860 } 861 862 /* 863 * Send it, precisely as ether_output() would have. 864 * We are already running at splimp. 865 */ 866 IFQ_HANDOFF(p, m, error); 867 if (!error) 868 ifp->if_opackets++; 869 else 870 ifp->if_oerrors++; 871 } 872 } 873 874 static void 875 vlan_input(struct ifnet *ifp, struct mbuf *m) 876 { 877 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 878 struct ifvlan *ifv; 879 uint16_t tag; 880 881 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 882 883 if (m->m_flags & M_VLANTAG) { 884 /* 885 * Packet is tagged, but m contains a normal 886 * Ethernet frame; the tag is stored out-of-band. 887 */ 888 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 889 m->m_flags &= ~M_VLANTAG; 890 } else { 891 struct ether_vlan_header *evl; 892 893 /* 894 * Packet is tagged in-band as specified by 802.1q. 895 */ 896 switch (ifp->if_type) { 897 case IFT_ETHER: 898 if (m->m_len < sizeof(*evl) && 899 (m = m_pullup(m, sizeof(*evl))) == NULL) { 900 if_printf(ifp, "cannot pullup VLAN header\n"); 901 return; 902 } 903 evl = mtod(m, struct ether_vlan_header *); 904 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 905 906 /* 907 * Remove the 802.1q header by copying the Ethernet 908 * addresses over it and adjusting the beginning of 909 * the data in the mbuf. The encapsulated Ethernet 910 * type field is already in place. 911 */ 912 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 913 ETHER_HDR_LEN - ETHER_TYPE_LEN); 914 m_adj(m, ETHER_VLAN_ENCAP_LEN); 915 break; 916 917 default: 918 #ifdef INVARIANTS 919 panic("%s: %s has unsupported if_type %u", 920 __func__, ifp->if_xname, ifp->if_type); 921 #endif 922 m_freem(m); 923 ifp->if_noproto++; 924 return; 925 } 926 } 927 928 TRUNK_RLOCK(trunk); 929 #ifdef VLAN_ARRAY 930 ifv = trunk->vlans[tag]; 931 #else 932 ifv = vlan_gethash(trunk, tag); 933 #endif 934 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 935 TRUNK_RUNLOCK(trunk); 936 m_freem(m); 937 ifp->if_noproto++; 938 return; 939 } 940 TRUNK_RUNLOCK(trunk); 941 942 m->m_pkthdr.rcvif = ifv->ifv_ifp; 943 ifv->ifv_ifp->if_ipackets++; 944 945 /* Pass it back through the parent's input routine. */ 946 (*ifp->if_input)(ifv->ifv_ifp, m); 947 } 948 949 static int 950 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 951 { 952 struct ifvlantrunk *trunk; 953 struct ifnet *ifp; 954 int error = 0; 955 956 /* VID numbers 0x0 and 0xFFF are reserved */ 957 if (tag == 0 || tag == 0xFFF) 958 return (EINVAL); 959 if (p->if_type != IFT_ETHER) 960 return (EPROTONOSUPPORT); 961 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 962 return (EPROTONOSUPPORT); 963 if (ifv->ifv_trunk) 964 return (EBUSY); 965 966 if (p->if_vlantrunk == NULL) { 967 trunk = malloc(sizeof(struct ifvlantrunk), 968 M_VLAN, M_WAITOK | M_ZERO); 969 #ifndef VLAN_ARRAY 970 vlan_inithash(trunk); 971 #endif 972 VLAN_LOCK(); 973 if (p->if_vlantrunk != NULL) { 974 /* A race that that is very unlikely to be hit. */ 975 #ifndef VLAN_ARRAY 976 vlan_freehash(trunk); 977 #endif 978 free(trunk, M_VLAN); 979 goto exists; 980 } 981 TRUNK_LOCK_INIT(trunk); 982 TRUNK_LOCK(trunk); 983 p->if_vlantrunk = trunk; 984 trunk->parent = p; 985 } else { 986 VLAN_LOCK(); 987 exists: 988 trunk = p->if_vlantrunk; 989 TRUNK_LOCK(trunk); 990 } 991 992 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 993 #ifdef VLAN_ARRAY 994 if (trunk->vlans[tag] != NULL) { 995 error = EEXIST; 996 goto done; 997 } 998 trunk->vlans[tag] = ifv; 999 trunk->refcnt++; 1000 #else 1001 error = vlan_inshash(trunk, ifv); 1002 if (error) 1003 goto done; 1004 #endif 1005 ifv->ifv_proto = ETHERTYPE_VLAN; 1006 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1007 ifv->ifv_mintu = ETHERMIN; 1008 ifv->ifv_pflags = 0; 1009 1010 /* 1011 * If the parent supports the VLAN_MTU capability, 1012 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1013 * use it. 1014 */ 1015 if (p->if_capenable & IFCAP_VLAN_MTU) { 1016 /* 1017 * No need to fudge the MTU since the parent can 1018 * handle extended frames. 1019 */ 1020 ifv->ifv_mtufudge = 0; 1021 } else { 1022 /* 1023 * Fudge the MTU by the encapsulation size. This 1024 * makes us incompatible with strictly compliant 1025 * 802.1Q implementations, but allows us to use 1026 * the feature with other NetBSD implementations, 1027 * which might still be useful. 1028 */ 1029 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1030 } 1031 1032 ifv->ifv_trunk = trunk; 1033 ifp = ifv->ifv_ifp; 1034 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1035 ifp->if_baudrate = p->if_baudrate; 1036 /* 1037 * Copy only a selected subset of flags from the parent. 1038 * Other flags are none of our business. 1039 */ 1040 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1041 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1042 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1043 #undef VLAN_COPY_FLAGS 1044 1045 ifp->if_link_state = p->if_link_state; 1046 1047 vlan_capabilities(ifv); 1048 1049 /* 1050 * Set up our ``Ethernet address'' to reflect the underlying 1051 * physical interface's. 1052 */ 1053 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1054 1055 /* 1056 * Configure multicast addresses that may already be 1057 * joined on the vlan device. 1058 */ 1059 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1060 1061 /* We are ready for operation now. */ 1062 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1063 done: 1064 TRUNK_UNLOCK(trunk); 1065 if (error == 0) 1066 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1067 VLAN_UNLOCK(); 1068 1069 return (error); 1070 } 1071 1072 static int 1073 vlan_unconfig(struct ifnet *ifp) 1074 { 1075 int ret; 1076 1077 VLAN_LOCK(); 1078 ret = vlan_unconfig_locked(ifp); 1079 VLAN_UNLOCK(); 1080 return (ret); 1081 } 1082 1083 static int 1084 vlan_unconfig_locked(struct ifnet *ifp) 1085 { 1086 struct ifvlantrunk *trunk; 1087 struct vlan_mc_entry *mc; 1088 struct ifvlan *ifv; 1089 struct ifnet *parent; 1090 int error; 1091 1092 VLAN_LOCK_ASSERT(); 1093 1094 ifv = ifp->if_softc; 1095 trunk = ifv->ifv_trunk; 1096 parent = NULL; 1097 1098 if (trunk != NULL) { 1099 struct sockaddr_dl sdl; 1100 1101 TRUNK_LOCK(trunk); 1102 parent = trunk->parent; 1103 1104 /* 1105 * Since the interface is being unconfigured, we need to 1106 * empty the list of multicast groups that we may have joined 1107 * while we were alive from the parent's list. 1108 */ 1109 bzero((char *)&sdl, sizeof(sdl)); 1110 sdl.sdl_len = sizeof(sdl); 1111 sdl.sdl_family = AF_LINK; 1112 sdl.sdl_index = parent->if_index; 1113 sdl.sdl_type = IFT_ETHER; 1114 sdl.sdl_alen = ETHER_ADDR_LEN; 1115 1116 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1117 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1118 ETHER_ADDR_LEN); 1119 error = if_delmulti(parent, (struct sockaddr *)&sdl); 1120 if (error) 1121 return (error); 1122 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1123 free(mc, M_VLAN); 1124 } 1125 1126 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1127 #ifdef VLAN_ARRAY 1128 trunk->vlans[ifv->ifv_tag] = NULL; 1129 trunk->refcnt--; 1130 #else 1131 vlan_remhash(trunk, ifv); 1132 #endif 1133 ifv->ifv_trunk = NULL; 1134 1135 /* 1136 * Check if we were the last. 1137 */ 1138 if (trunk->refcnt == 0) { 1139 trunk->parent->if_vlantrunk = NULL; 1140 /* 1141 * XXXGL: If some ithread has already entered 1142 * vlan_input() and is now blocked on the trunk 1143 * lock, then it should preempt us right after 1144 * unlock and finish its work. Then we will acquire 1145 * lock again in trunk_destroy(). 1146 */ 1147 TRUNK_UNLOCK(trunk); 1148 trunk_destroy(trunk); 1149 } else 1150 TRUNK_UNLOCK(trunk); 1151 } 1152 1153 /* Disconnect from parent. */ 1154 if (ifv->ifv_pflags) 1155 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1156 ifp->if_mtu = ETHERMTU; 1157 ifp->if_link_state = LINK_STATE_UNKNOWN; 1158 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1159 1160 /* 1161 * Only dispatch an event if vlan was 1162 * attached, otherwise there is nothing 1163 * to cleanup anyway. 1164 */ 1165 if (parent != NULL) 1166 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1167 1168 return (0); 1169 } 1170 1171 /* Handle a reference counted flag that should be set on the parent as well */ 1172 static int 1173 vlan_setflag(struct ifnet *ifp, int flag, int status, 1174 int (*func)(struct ifnet *, int)) 1175 { 1176 struct ifvlan *ifv; 1177 int error; 1178 1179 /* XXX VLAN_LOCK_ASSERT(); */ 1180 1181 ifv = ifp->if_softc; 1182 status = status ? (ifp->if_flags & flag) : 0; 1183 /* Now "status" contains the flag value or 0 */ 1184 1185 /* 1186 * See if recorded parent's status is different from what 1187 * we want it to be. If it is, flip it. We record parent's 1188 * status in ifv_pflags so that we won't clear parent's flag 1189 * we haven't set. In fact, we don't clear or set parent's 1190 * flags directly, but get or release references to them. 1191 * That's why we can be sure that recorded flags still are 1192 * in accord with actual parent's flags. 1193 */ 1194 if (status != (ifv->ifv_pflags & flag)) { 1195 error = (*func)(PARENT(ifv), status); 1196 if (error) 1197 return (error); 1198 ifv->ifv_pflags &= ~flag; 1199 ifv->ifv_pflags |= status; 1200 } 1201 return (0); 1202 } 1203 1204 /* 1205 * Handle IFF_* flags that require certain changes on the parent: 1206 * if "status" is true, update parent's flags respective to our if_flags; 1207 * if "status" is false, forcedly clear the flags set on parent. 1208 */ 1209 static int 1210 vlan_setflags(struct ifnet *ifp, int status) 1211 { 1212 int error, i; 1213 1214 for (i = 0; vlan_pflags[i].flag; i++) { 1215 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1216 status, vlan_pflags[i].func); 1217 if (error) 1218 return (error); 1219 } 1220 return (0); 1221 } 1222 1223 /* Inform all vlans that their parent has changed link state */ 1224 static void 1225 vlan_link_state(struct ifnet *ifp, int link) 1226 { 1227 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1228 struct ifvlan *ifv; 1229 int i; 1230 1231 TRUNK_LOCK(trunk); 1232 #ifdef VLAN_ARRAY 1233 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1234 if (trunk->vlans[i] != NULL) { 1235 ifv = trunk->vlans[i]; 1236 #else 1237 for (i = 0; i < (1 << trunk->hwidth); i++) 1238 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1239 #endif 1240 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1241 if_link_state_change(ifv->ifv_ifp, 1242 trunk->parent->if_link_state); 1243 } 1244 TRUNK_UNLOCK(trunk); 1245 } 1246 1247 static void 1248 vlan_capabilities(struct ifvlan *ifv) 1249 { 1250 struct ifnet *p = PARENT(ifv); 1251 struct ifnet *ifp = ifv->ifv_ifp; 1252 1253 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1254 1255 /* 1256 * If the parent interface can do checksum offloading 1257 * on VLANs, then propagate its hardware-assisted 1258 * checksumming flags. Also assert that checksum 1259 * offloading requires hardware VLAN tagging. 1260 */ 1261 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1262 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1263 1264 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1265 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1266 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1267 ifp->if_hwassist = p->if_hwassist; 1268 } else { 1269 ifp->if_capenable = 0; 1270 ifp->if_hwassist = 0; 1271 } 1272 } 1273 1274 static void 1275 vlan_trunk_capabilities(struct ifnet *ifp) 1276 { 1277 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1278 struct ifvlan *ifv; 1279 int i; 1280 1281 TRUNK_LOCK(trunk); 1282 #ifdef VLAN_ARRAY 1283 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1284 if (trunk->vlans[i] != NULL) { 1285 ifv = trunk->vlans[i]; 1286 #else 1287 for (i = 0; i < (1 << trunk->hwidth); i++) { 1288 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1289 #endif 1290 vlan_capabilities(ifv); 1291 } 1292 TRUNK_UNLOCK(trunk); 1293 } 1294 1295 static int 1296 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1297 { 1298 struct ifaddr *ifa; 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 ifa = (struct ifaddr *)data; 1307 ifv = ifp->if_softc; 1308 1309 switch (cmd) { 1310 case SIOCGIFMEDIA: 1311 VLAN_LOCK(); 1312 if (TRUNK(ifv) != NULL) { 1313 error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv), 1314 SIOCGIFMEDIA, data); 1315 VLAN_UNLOCK(); 1316 /* Limit the result to the parent's current config. */ 1317 if (error == 0) { 1318 struct ifmediareq *ifmr; 1319 1320 ifmr = (struct ifmediareq *)data; 1321 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1322 ifmr->ifm_count = 1; 1323 error = copyout(&ifmr->ifm_current, 1324 ifmr->ifm_ulist, 1325 sizeof(int)); 1326 } 1327 } 1328 } else { 1329 VLAN_UNLOCK(); 1330 error = EINVAL; 1331 } 1332 break; 1333 1334 case SIOCSIFMEDIA: 1335 error = EINVAL; 1336 break; 1337 1338 case SIOCSIFMTU: 1339 /* 1340 * Set the interface MTU. 1341 */ 1342 VLAN_LOCK(); 1343 if (TRUNK(ifv) != NULL) { 1344 if (ifr->ifr_mtu > 1345 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1346 ifr->ifr_mtu < 1347 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1348 error = EINVAL; 1349 else 1350 ifp->if_mtu = ifr->ifr_mtu; 1351 } else 1352 error = EINVAL; 1353 VLAN_UNLOCK(); 1354 break; 1355 1356 case SIOCSETVLAN: 1357 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1358 if (error) 1359 break; 1360 if (vlr.vlr_parent[0] == '\0') { 1361 vlan_unconfig(ifp); 1362 break; 1363 } 1364 p = ifunit(vlr.vlr_parent); 1365 if (p == 0) { 1366 error = ENOENT; 1367 break; 1368 } 1369 /* 1370 * Don't let the caller set up a VLAN tag with 1371 * anything except VLID bits. 1372 */ 1373 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1374 error = EINVAL; 1375 break; 1376 } 1377 error = vlan_config(ifv, p, vlr.vlr_tag); 1378 if (error) 1379 break; 1380 1381 /* Update flags on the parent, if necessary. */ 1382 vlan_setflags(ifp, 1); 1383 break; 1384 1385 case SIOCGETVLAN: 1386 bzero(&vlr, sizeof(vlr)); 1387 VLAN_LOCK(); 1388 if (TRUNK(ifv) != NULL) { 1389 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1390 sizeof(vlr.vlr_parent)); 1391 vlr.vlr_tag = ifv->ifv_tag; 1392 } 1393 VLAN_UNLOCK(); 1394 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1395 break; 1396 1397 case SIOCSIFFLAGS: 1398 /* 1399 * We should propagate selected flags to the parent, 1400 * e.g., promiscuous mode. 1401 */ 1402 if (TRUNK(ifv) != NULL) 1403 error = vlan_setflags(ifp, 1); 1404 break; 1405 1406 case SIOCADDMULTI: 1407 case SIOCDELMULTI: 1408 /* 1409 * If we don't have a parent, just remember the membership for 1410 * when we do. 1411 */ 1412 if (TRUNK(ifv) != NULL) 1413 error = vlan_setmulti(ifp); 1414 break; 1415 1416 default: 1417 error = ether_ioctl(ifp, cmd, data); 1418 } 1419 1420 return (error); 1421 }
Cache object: 643710f45b9fb6e131673bc9c5fe8bd6
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