Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/net/if_vlan.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. 32 * Might be extended some day to also handle IEEE 802.1p priority 33 * tagging. This is sort of sneaky in the implementation, since 34 * we need to pretend to be enough of an Ethernet implementation 35 * to make arp work. The way we do this is by telling everyone 36 * that we are an Ethernet, and then catch the packets that 37 * ether_output() left on our output queue when it calls 38 * if_start(), rewrite them for use by the real outgoing interface, 39 * and ask it to send them. 40 */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include "opt_vlan.h" 46 47 #include <sys/param.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/malloc.h> 51 #include <sys/mbuf.h> 52 #include <sys/module.h> 53 #include <sys/rwlock.h> 54 #include <sys/queue.h> 55 #include <sys/socket.h> 56 #include <sys/sockio.h> 57 #include <sys/sysctl.h> 58 #include <sys/systm.h> 59 60 #include <net/bpf.h> 61 #include <net/ethernet.h> 62 #include <net/if.h> 63 #include <net/if_clone.h> 64 #include <net/if_dl.h> 65 #include <net/if_types.h> 66 #include <net/if_vlan_var.h> 67 68 #define VLANNAME "vlan" 69 #define VLAN_DEF_HWIDTH 4 70 #define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 71 72 #define UP_AND_RUNNING(ifp) \ 73 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 74 75 LIST_HEAD(ifvlanhead, ifvlan); 76 77 struct ifvlantrunk { 78 struct ifnet *parent; /* parent interface of this trunk */ 79 struct rwlock rw; 80 #ifdef VLAN_ARRAY 81 #define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 82 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 83 #else 84 struct ifvlanhead *hash; /* dynamic hash-list table */ 85 uint16_t hmask; 86 uint16_t hwidth; 87 #endif 88 int refcnt; 89 }; 90 91 struct vlan_mc_entry { 92 struct ether_addr mc_addr; 93 SLIST_ENTRY(vlan_mc_entry) mc_entries; 94 }; 95 96 struct ifvlan { 97 struct ifvlantrunk *ifv_trunk; 98 struct ifnet *ifv_ifp; 99 #define TRUNK(ifv) ((ifv)->ifv_trunk) 100 #define PARENT(ifv) ((ifv)->ifv_trunk->parent) 101 int ifv_pflags; /* special flags we have set on parent */ 102 struct ifv_linkmib { 103 int ifvm_encaplen; /* encapsulation length */ 104 int ifvm_mtufudge; /* MTU fudged by this much */ 105 int ifvm_mintu; /* min transmission unit */ 106 uint16_t ifvm_proto; /* encapsulation ethertype */ 107 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 108 } ifv_mib; 109 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 110 #ifndef VLAN_ARRAY 111 LIST_ENTRY(ifvlan) ifv_list; 112 #endif 113 }; 114 #define ifv_proto ifv_mib.ifvm_proto 115 #define ifv_tag ifv_mib.ifvm_tag 116 #define ifv_encaplen ifv_mib.ifvm_encaplen 117 #define ifv_mtufudge ifv_mib.ifvm_mtufudge 118 #define ifv_mintu ifv_mib.ifvm_mintu 119 120 /* Special flags we should propagate to parent. */ 121 static struct { 122 int flag; 123 int (*func)(struct ifnet *, int); 124 } vlan_pflags[] = { 125 {IFF_PROMISC, ifpromisc}, 126 {IFF_ALLMULTI, if_allmulti}, 127 {0, NULL} 128 }; 129 130 SYSCTL_DECL(_net_link); 131 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 132 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 133 134 static int soft_pad = 0; 135 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 136 "pad short frames before tagging"); 137 138 static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 139 140 static eventhandler_tag ifdetach_tag; 141 142 /* 143 * We have a global mutex, that is used to serialize configuration 144 * changes and isn't used in normal packet delivery. 145 * 146 * We also have a per-trunk rwlock, that is locked shared on packet 147 * processing and exclusive when configuration is changed. 148 * 149 * The VLAN_ARRAY substitutes the dynamic hash with a static array 150 * with 4096 entries. In theory this can give a boost in processing, 151 * however on practice it does not. Probably this is because array 152 * is too big to fit into CPU cache. 153 */ 154 static struct mtx ifv_mtx; 155 #define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 156 #define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 157 #define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 158 #define VLAN_LOCK() mtx_lock(&ifv_mtx) 159 #define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 160 #define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 161 #define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 162 #define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 163 #define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 164 #define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 165 #define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 166 #define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 167 #define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 168 169 #ifndef VLAN_ARRAY 170 static void vlan_inithash(struct ifvlantrunk *trunk); 171 static void vlan_freehash(struct ifvlantrunk *trunk); 172 static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 173 static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 174 static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 175 static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 176 uint16_t tag); 177 #endif 178 static void trunk_destroy(struct ifvlantrunk *trunk); 179 180 static void vlan_start(struct ifnet *ifp); 181 static void vlan_init(void *foo); 182 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 183 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 184 static int vlan_setflag(struct ifnet *ifp, int flag, int status, 185 int (*func)(struct ifnet *, int)); 186 static int vlan_setflags(struct ifnet *ifp, int status); 187 static int vlan_setmulti(struct ifnet *ifp); 188 static void vlan_unconfig(struct ifnet *ifp); 189 static void vlan_unconfig_locked(struct ifnet *ifp); 190 static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 191 static void vlan_link_state(struct ifnet *ifp, int link); 192 static void vlan_capabilities(struct ifvlan *ifv); 193 static void vlan_trunk_capabilities(struct ifnet *ifp); 194 195 static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 196 const char *, int *); 197 static int vlan_clone_match(struct if_clone *, const char *); 198 static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 199 static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 200 201 static void vlan_ifdetach(void *arg, struct ifnet *ifp); 202 203 static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 204 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 205 206 #ifndef VLAN_ARRAY 207 #define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 208 209 static void 210 vlan_inithash(struct ifvlantrunk *trunk) 211 { 212 int i, n; 213 214 /* 215 * The trunk must not be locked here since we call malloc(M_WAITOK). 216 * It is OK in case this function is called before the trunk struct 217 * gets hooked up and becomes visible from other threads. 218 */ 219 220 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 221 ("%s: hash already initialized", __func__)); 222 223 trunk->hwidth = VLAN_DEF_HWIDTH; 224 n = 1 << trunk->hwidth; 225 trunk->hmask = n - 1; 226 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 227 for (i = 0; i < n; i++) 228 LIST_INIT(&trunk->hash[i]); 229 } 230 231 static void 232 vlan_freehash(struct ifvlantrunk *trunk) 233 { 234 #ifdef INVARIANTS 235 int i; 236 237 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 238 for (i = 0; i < (1 << trunk->hwidth); i++) 239 KASSERT(LIST_EMPTY(&trunk->hash[i]), 240 ("%s: hash table not empty", __func__)); 241 #endif 242 free(trunk->hash, M_VLAN); 243 trunk->hash = NULL; 244 trunk->hwidth = trunk->hmask = 0; 245 } 246 247 static int 248 vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 249 { 250 int i, b; 251 struct ifvlan *ifv2; 252 253 TRUNK_LOCK_ASSERT(trunk); 254 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 255 256 b = 1 << trunk->hwidth; 257 i = HASH(ifv->ifv_tag, trunk->hmask); 258 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 259 if (ifv->ifv_tag == ifv2->ifv_tag) 260 return (EEXIST); 261 262 /* 263 * Grow the hash when the number of vlans exceeds half of the number of 264 * hash buckets squared. This will make the average linked-list length 265 * buckets/2. 266 */ 267 if (trunk->refcnt > (b * b) / 2) { 268 vlan_growhash(trunk, 1); 269 i = HASH(ifv->ifv_tag, trunk->hmask); 270 } 271 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 272 trunk->refcnt++; 273 274 return (0); 275 } 276 277 static int 278 vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 279 { 280 int i, b; 281 struct ifvlan *ifv2; 282 283 TRUNK_LOCK_ASSERT(trunk); 284 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 285 286 b = 1 << trunk->hwidth; 287 i = HASH(ifv->ifv_tag, trunk->hmask); 288 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 289 if (ifv2 == ifv) { 290 trunk->refcnt--; 291 LIST_REMOVE(ifv2, ifv_list); 292 if (trunk->refcnt < (b * b) / 2) 293 vlan_growhash(trunk, -1); 294 return (0); 295 } 296 297 panic("%s: vlan not found\n", __func__); 298 return (ENOENT); /*NOTREACHED*/ 299 } 300 301 /* 302 * Grow the hash larger or smaller if memory permits. 303 */ 304 static void 305 vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 306 { 307 struct ifvlan *ifv; 308 struct ifvlanhead *hash2; 309 int hwidth2, i, j, n, n2; 310 311 TRUNK_LOCK_ASSERT(trunk); 312 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 313 314 if (howmuch == 0) { 315 /* Harmless yet obvious coding error */ 316 printf("%s: howmuch is 0\n", __func__); 317 return; 318 } 319 320 hwidth2 = trunk->hwidth + howmuch; 321 n = 1 << trunk->hwidth; 322 n2 = 1 << hwidth2; 323 /* Do not shrink the table below the default */ 324 if (hwidth2 < VLAN_DEF_HWIDTH) 325 return; 326 327 /* M_NOWAIT because we're called with trunk mutex held */ 328 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 329 if (hash2 == NULL) { 330 printf("%s: out of memory -- hash size not changed\n", 331 __func__); 332 return; /* We can live with the old hash table */ 333 } 334 for (j = 0; j < n2; j++) 335 LIST_INIT(&hash2[j]); 336 for (i = 0; i < n; i++) 337 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 338 LIST_REMOVE(ifv, ifv_list); 339 j = HASH(ifv->ifv_tag, n2 - 1); 340 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 341 } 342 free(trunk->hash, M_VLAN); 343 trunk->hash = hash2; 344 trunk->hwidth = hwidth2; 345 trunk->hmask = n2 - 1; 346 347 if (bootverbose) 348 if_printf(trunk->parent, 349 "VLAN hash table resized from %d to %d buckets\n", n, n2); 350 } 351 352 static __inline struct ifvlan * 353 vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 354 { 355 struct ifvlan *ifv; 356 357 TRUNK_LOCK_RASSERT(trunk); 358 359 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 360 if (ifv->ifv_tag == tag) 361 return (ifv); 362 return (NULL); 363 } 364 365 #if 0 366 /* Debugging code to view the hashtables. */ 367 static void 368 vlan_dumphash(struct ifvlantrunk *trunk) 369 { 370 int i; 371 struct ifvlan *ifv; 372 373 for (i = 0; i < (1 << trunk->hwidth); i++) { 374 printf("%d: ", i); 375 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 376 printf("%s ", ifv->ifv_ifp->if_xname); 377 printf("\n"); 378 } 379 } 380 #endif /* 0 */ 381 #endif /* !VLAN_ARRAY */ 382 383 static void 384 trunk_destroy(struct ifvlantrunk *trunk) 385 { 386 VLAN_LOCK_ASSERT(); 387 388 TRUNK_LOCK(trunk); 389 #ifndef VLAN_ARRAY 390 vlan_freehash(trunk); 391 #endif 392 trunk->parent->if_vlantrunk = NULL; 393 TRUNK_UNLOCK(trunk); 394 TRUNK_LOCK_DESTROY(trunk); 395 free(trunk, M_VLAN); 396 } 397 398 /* 399 * Program our multicast filter. What we're actually doing is 400 * programming the multicast filter of the parent. This has the 401 * side effect of causing the parent interface to receive multicast 402 * traffic that it doesn't really want, which ends up being discarded 403 * later by the upper protocol layers. Unfortunately, there's no way 404 * to avoid this: there really is only one physical interface. 405 * 406 * XXX: There is a possible race here if more than one thread is 407 * modifying the multicast state of the vlan interface at the same time. 408 */ 409 static int 410 vlan_setmulti(struct ifnet *ifp) 411 { 412 struct ifnet *ifp_p; 413 struct ifmultiaddr *ifma, *rifma = NULL; 414 struct ifvlan *sc; 415 struct vlan_mc_entry *mc; 416 struct sockaddr_dl sdl; 417 int error; 418 419 /*VLAN_LOCK_ASSERT();*/ 420 421 /* Find the parent. */ 422 sc = ifp->if_softc; 423 ifp_p = PARENT(sc); 424 425 bzero((char *)&sdl, sizeof(sdl)); 426 sdl.sdl_len = sizeof(sdl); 427 sdl.sdl_family = AF_LINK; 428 sdl.sdl_index = ifp_p->if_index; 429 sdl.sdl_type = IFT_ETHER; 430 sdl.sdl_alen = ETHER_ADDR_LEN; 431 432 /* First, remove any existing filter entries. */ 433 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 434 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 435 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 436 if (error) 437 return (error); 438 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 439 free(mc, M_VLAN); 440 } 441 442 /* Now program new ones. */ 443 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 444 if (ifma->ifma_addr->sa_family != AF_LINK) 445 continue; 446 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 447 if (mc == NULL) 448 return (ENOMEM); 449 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 450 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 451 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 452 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 453 LLADDR(&sdl), ETHER_ADDR_LEN); 454 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 455 if (error) 456 return (error); 457 } 458 459 return (0); 460 } 461 462 /* 463 * A handler for network interface departure events. 464 * Track departure of trunks here so that we don't access invalid 465 * pointers or whatever if a trunk is ripped from under us, e.g., 466 * by ejecting its hot-plug card. However, if an ifnet is simply 467 * being renamed, then there's no need to tear down the state. 468 */ 469 static void 470 vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 471 { 472 struct ifvlan *ifv; 473 int i; 474 475 /* 476 * Check if it's a trunk interface first of all 477 * to avoid needless locking. 478 */ 479 if (ifp->if_vlantrunk == NULL) 480 return; 481 482 /* If the ifnet is just being renamed, don't do anything. */ 483 if (ifp->if_flags & IFF_RENAMING) 484 return; 485 486 VLAN_LOCK(); 487 /* 488 * OK, it's a trunk. Loop over and detach all vlan's on it. 489 * Check trunk pointer after each vlan_unconfig() as it will 490 * free it and set to NULL after the last vlan was detached. 491 */ 492 #ifdef VLAN_ARRAY 493 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 494 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 495 vlan_unconfig_locked(ifv->ifv_ifp); 496 if (ifp->if_vlantrunk == NULL) 497 break; 498 } 499 #else /* VLAN_ARRAY */ 500 restart: 501 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 502 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 503 vlan_unconfig_locked(ifv->ifv_ifp); 504 if (ifp->if_vlantrunk) 505 goto restart; /* trunk->hwidth can change */ 506 else 507 break; 508 } 509 #endif /* VLAN_ARRAY */ 510 /* Trunk should have been destroyed in vlan_unconfig(). */ 511 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 512 VLAN_UNLOCK(); 513 } 514 515 /* 516 * VLAN support can be loaded as a module. The only place in the 517 * system that's intimately aware of this is ether_input. We hook 518 * into this code through vlan_input_p which is defined there and 519 * set here. Noone else in the system should be aware of this so 520 * we use an explicit reference here. 521 */ 522 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 523 524 /* For if_link_state_change() eyes only... */ 525 extern void (*vlan_link_state_p)(struct ifnet *, int); 526 527 static int 528 vlan_modevent(module_t mod, int type, void *data) 529 { 530 531 switch (type) { 532 case MOD_LOAD: 533 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 534 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 535 if (ifdetach_tag == NULL) 536 return (ENOMEM); 537 VLAN_LOCK_INIT(); 538 vlan_input_p = vlan_input; 539 vlan_link_state_p = vlan_link_state; 540 vlan_trunk_cap_p = vlan_trunk_capabilities; 541 if_clone_attach(&vlan_cloner); 542 if (bootverbose) 543 printf("vlan: initialized, using " 544 #ifdef VLAN_ARRAY 545 "full-size arrays" 546 #else 547 "hash tables with chaining" 548 #endif 549 550 "\n"); 551 break; 552 case MOD_UNLOAD: 553 if_clone_detach(&vlan_cloner); 554 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 555 vlan_input_p = NULL; 556 vlan_link_state_p = NULL; 557 vlan_trunk_cap_p = NULL; 558 VLAN_LOCK_DESTROY(); 559 if (bootverbose) 560 printf("vlan: unloaded\n"); 561 break; 562 default: 563 return (EOPNOTSUPP); 564 } 565 return (0); 566 } 567 568 static moduledata_t vlan_mod = { 569 "if_vlan", 570 vlan_modevent, 571 0 572 }; 573 574 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 575 MODULE_VERSION(if_vlan, 3); 576 577 static struct ifnet * 578 vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 579 { 580 const char *cp; 581 struct ifnet *ifp; 582 int t; 583 584 /* Check for <etherif>.<vlan> style interface names. */ 585 IFNET_RLOCK(); 586 TAILQ_FOREACH(ifp, &ifnet, if_link) { 587 if (ifp->if_type != IFT_ETHER) 588 continue; 589 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 590 continue; 591 cp = name + strlen(ifp->if_xname); 592 if (*cp++ != '.') 593 continue; 594 if (*cp == '\0') 595 continue; 596 t = 0; 597 for(; *cp >= '' && *cp <= '9'; cp++) 598 t = (t * 10) + (*cp - ''); 599 if (*cp != '\0') 600 continue; 601 if (tag != NULL) 602 *tag = t; 603 break; 604 } 605 IFNET_RUNLOCK(); 606 607 return (ifp); 608 } 609 610 static int 611 vlan_clone_match(struct if_clone *ifc, const char *name) 612 { 613 const char *cp; 614 615 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 616 return (1); 617 618 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 619 return (0); 620 for (cp = name + 4; *cp != '\0'; cp++) { 621 if (*cp < '' || *cp > '9') 622 return (0); 623 } 624 625 return (1); 626 } 627 628 static int 629 vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 630 { 631 char *dp; 632 int wildcard; 633 int unit; 634 int error; 635 int tag; 636 int ethertag; 637 struct ifvlan *ifv; 638 struct ifnet *ifp; 639 struct ifnet *p; 640 struct vlanreq vlr; 641 static const u_char eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */ 642 643 /* 644 * There are 3 (ugh) ways to specify the cloned device: 645 * o pass a parameter block with the clone request. 646 * o specify parameters in the text of the clone device name 647 * o specify no parameters and get an unattached device that 648 * must be configured separately. 649 * The first technique is preferred; the latter two are 650 * supported for backwards compatibilty. 651 */ 652 if (params) { 653 error = copyin(params, &vlr, sizeof(vlr)); 654 if (error) 655 return error; 656 p = ifunit(vlr.vlr_parent); 657 if (p == NULL) 658 return ENXIO; 659 /* 660 * Don't let the caller set up a VLAN tag with 661 * anything except VLID bits. 662 */ 663 if (vlr.vlr_tag & ~EVL_VLID_MASK) 664 return (EINVAL); 665 error = ifc_name2unit(name, &unit); 666 if (error != 0) 667 return (error); 668 669 ethertag = 1; 670 tag = vlr.vlr_tag; 671 wildcard = (unit < 0); 672 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 673 ethertag = 1; 674 unit = -1; 675 wildcard = 0; 676 677 /* 678 * Don't let the caller set up a VLAN tag with 679 * anything except VLID bits. 680 */ 681 if (tag & ~EVL_VLID_MASK) 682 return (EINVAL); 683 } else { 684 ethertag = 0; 685 686 error = ifc_name2unit(name, &unit); 687 if (error != 0) 688 return (error); 689 690 wildcard = (unit < 0); 691 } 692 693 error = ifc_alloc_unit(ifc, &unit); 694 if (error != 0) 695 return (error); 696 697 /* In the wildcard case, we need to update the name. */ 698 if (wildcard) { 699 for (dp = name; *dp != '\0'; dp++); 700 if (snprintf(dp, len - (dp-name), "%d", unit) > 701 len - (dp-name) - 1) { 702 panic("%s: interface name too long", __func__); 703 } 704 } 705 706 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 707 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 708 if (ifp == NULL) { 709 ifc_free_unit(ifc, unit); 710 free(ifv, M_VLAN); 711 return (ENOSPC); 712 } 713 SLIST_INIT(&ifv->vlan_mc_listhead); 714 715 ifp->if_softc = ifv; 716 /* 717 * Set the name manually rather than using if_initname because 718 * we don't conform to the default naming convention for interfaces. 719 */ 720 strlcpy(ifp->if_xname, name, IFNAMSIZ); 721 ifp->if_dname = ifc->ifc_name; 722 ifp->if_dunit = unit; 723 /* NB: flags are not set here */ 724 ifp->if_linkmib = &ifv->ifv_mib; 725 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 726 /* NB: mtu is not set here */ 727 728 ifp->if_init = vlan_init; 729 ifp->if_start = vlan_start; 730 ifp->if_ioctl = vlan_ioctl; 731 ifp->if_snd.ifq_maxlen = ifqmaxlen; 732 ifp->if_flags = VLAN_IFFLAGS; 733 ether_ifattach(ifp, eaddr); 734 /* Now undo some of the damage... */ 735 ifp->if_baudrate = 0; 736 ifp->if_type = IFT_L2VLAN; 737 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 738 739 if (ethertag) { 740 error = vlan_config(ifv, p, tag); 741 if (error != 0) { 742 /* 743 * Since we've partialy failed, we need to back 744 * out all the way, otherwise userland could get 745 * confused. Thus, we destroy the interface. 746 */ 747 ether_ifdetach(ifp); 748 vlan_unconfig(ifp); 749 if_free_type(ifp, IFT_ETHER); 750 ifc_free_unit(ifc, unit); 751 free(ifv, M_VLAN); 752 753 return (error); 754 } 755 756 /* Update flags on the parent, if necessary. */ 757 vlan_setflags(ifp, 1); 758 } 759 760 return (0); 761 } 762 763 static int 764 vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 765 { 766 struct ifvlan *ifv = ifp->if_softc; 767 int unit = ifp->if_dunit; 768 769 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 770 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 771 if_free_type(ifp, IFT_ETHER); 772 free(ifv, M_VLAN); 773 ifc_free_unit(ifc, unit); 774 775 return (0); 776 } 777 778 /* 779 * The ifp->if_init entry point for vlan(4) is a no-op. 780 */ 781 static void 782 vlan_init(void *foo __unused) 783 { 784 } 785 786 /* 787 * The if_start method for vlan(4) interface. It doesn't 788 * raises the IFF_DRV_OACTIVE flag, since it is called 789 * only from IFQ_HANDOFF() macro in ether_output_frame(). 790 * If the interface queue is full, and vlan_start() is 791 * not called, the queue would never get emptied and 792 * interface would stall forever. 793 */ 794 static void 795 vlan_start(struct ifnet *ifp) 796 { 797 struct ifvlan *ifv; 798 struct ifnet *p; 799 struct mbuf *m; 800 int error; 801 802 ifv = ifp->if_softc; 803 p = PARENT(ifv); 804 805 for (;;) { 806 IF_DEQUEUE(&ifp->if_snd, m); 807 if (m == NULL) 808 break; 809 BPF_MTAP(ifp, m); 810 811 /* 812 * Do not run parent's if_start() if the parent is not up, 813 * or parent's driver will cause a system crash. 814 */ 815 if (!UP_AND_RUNNING(p)) { 816 m_freem(m); 817 ifp->if_collisions++; 818 continue; 819 } 820 821 /* 822 * Pad the frame to the minimum size allowed if told to. 823 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 824 * paragraph C.4.4.3.b. It can help to work around buggy 825 * bridges that violate paragraph C.4.4.3.a from the same 826 * document, i.e., fail to pad short frames after untagging. 827 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 828 * untagging it will produce a 62-byte frame, which is a runt 829 * and requires padding. There are VLAN-enabled network 830 * devices that just discard such runts instead or mishandle 831 * them somehow. 832 */ 833 if (soft_pad) { 834 static char pad[8]; /* just zeros */ 835 int n; 836 837 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 838 n > 0; n -= sizeof(pad)) 839 if (!m_append(m, min(n, sizeof(pad)), pad)) 840 break; 841 842 if (n > 0) { 843 if_printf(ifp, "cannot pad short frame\n"); 844 ifp->if_oerrors++; 845 m_freem(m); 846 continue; 847 } 848 } 849 850 /* 851 * If underlying interface can do VLAN tag insertion itself, 852 * just pass the packet along. However, we need some way to 853 * tell the interface where the packet came from so that it 854 * knows how to find the VLAN tag to use, so we attach a 855 * packet tag that holds it. 856 */ 857 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 858 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 859 m->m_flags |= M_VLANTAG; 860 } else { 861 m = ether_vlanencap(m, ifv->ifv_tag); 862 if (m == NULL) { 863 if_printf(ifp, 864 "unable to prepend VLAN header\n"); 865 ifp->if_oerrors++; 866 continue; 867 } 868 } 869 870 /* 871 * Send it, precisely as ether_output() would have. 872 * We are already running at splimp. 873 */ 874 IFQ_HANDOFF(p, m, error); 875 if (!error) 876 ifp->if_opackets++; 877 else 878 ifp->if_oerrors++; 879 } 880 } 881 882 static void 883 vlan_input(struct ifnet *ifp, struct mbuf *m) 884 { 885 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 886 struct ifvlan *ifv; 887 uint16_t tag; 888 889 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 890 891 if (m->m_flags & M_VLANTAG) { 892 /* 893 * Packet is tagged, but m contains a normal 894 * Ethernet frame; the tag is stored out-of-band. 895 */ 896 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 897 m->m_flags &= ~M_VLANTAG; 898 } else { 899 struct ether_vlan_header *evl; 900 901 /* 902 * Packet is tagged in-band as specified by 802.1q. 903 */ 904 switch (ifp->if_type) { 905 case IFT_ETHER: 906 if (m->m_len < sizeof(*evl) && 907 (m = m_pullup(m, sizeof(*evl))) == NULL) { 908 if_printf(ifp, "cannot pullup VLAN header\n"); 909 return; 910 } 911 evl = mtod(m, struct ether_vlan_header *); 912 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 913 914 /* 915 * Remove the 802.1q header by copying the Ethernet 916 * addresses over it and adjusting the beginning of 917 * the data in the mbuf. The encapsulated Ethernet 918 * type field is already in place. 919 */ 920 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 921 ETHER_HDR_LEN - ETHER_TYPE_LEN); 922 m_adj(m, ETHER_VLAN_ENCAP_LEN); 923 break; 924 925 default: 926 #ifdef INVARIANTS 927 panic("%s: %s has unsupported if_type %u", 928 __func__, ifp->if_xname, ifp->if_type); 929 #endif 930 m_freem(m); 931 ifp->if_noproto++; 932 return; 933 } 934 } 935 936 TRUNK_RLOCK(trunk); 937 #ifdef VLAN_ARRAY 938 ifv = trunk->vlans[tag]; 939 #else 940 ifv = vlan_gethash(trunk, tag); 941 #endif 942 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 943 TRUNK_RUNLOCK(trunk); 944 m_freem(m); 945 ifp->if_noproto++; 946 return; 947 } 948 TRUNK_RUNLOCK(trunk); 949 950 m->m_pkthdr.rcvif = ifv->ifv_ifp; 951 ifv->ifv_ifp->if_ipackets++; 952 953 /* Pass it back through the parent's input routine. */ 954 (*ifp->if_input)(ifv->ifv_ifp, m); 955 } 956 957 static int 958 vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 959 { 960 struct ifvlantrunk *trunk; 961 struct ifnet *ifp; 962 int error = 0; 963 964 /* VID numbers 0x0 and 0xFFF are reserved */ 965 if (tag == 0 || tag == 0xFFF) 966 return (EINVAL); 967 if (p->if_type != IFT_ETHER) 968 return (EPROTONOSUPPORT); 969 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 970 return (EPROTONOSUPPORT); 971 if (ifv->ifv_trunk) 972 return (EBUSY); 973 974 if (p->if_vlantrunk == NULL) { 975 trunk = malloc(sizeof(struct ifvlantrunk), 976 M_VLAN, M_WAITOK | M_ZERO); 977 #ifndef VLAN_ARRAY 978 vlan_inithash(trunk); 979 #endif 980 VLAN_LOCK(); 981 if (p->if_vlantrunk != NULL) { 982 /* A race that that is very unlikely to be hit. */ 983 #ifndef VLAN_ARRAY 984 vlan_freehash(trunk); 985 #endif 986 free(trunk, M_VLAN); 987 goto exists; 988 } 989 TRUNK_LOCK_INIT(trunk); 990 TRUNK_LOCK(trunk); 991 p->if_vlantrunk = trunk; 992 trunk->parent = p; 993 } else { 994 VLAN_LOCK(); 995 exists: 996 trunk = p->if_vlantrunk; 997 TRUNK_LOCK(trunk); 998 } 999 1000 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1001 #ifdef VLAN_ARRAY 1002 if (trunk->vlans[tag] != NULL) { 1003 error = EEXIST; 1004 goto done; 1005 } 1006 trunk->vlans[tag] = ifv; 1007 trunk->refcnt++; 1008 #else 1009 error = vlan_inshash(trunk, ifv); 1010 if (error) 1011 goto done; 1012 #endif 1013 ifv->ifv_proto = ETHERTYPE_VLAN; 1014 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1015 ifv->ifv_mintu = ETHERMIN; 1016 ifv->ifv_pflags = 0; 1017 1018 /* 1019 * If the parent supports the VLAN_MTU capability, 1020 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1021 * use it. 1022 */ 1023 if (p->if_capenable & IFCAP_VLAN_MTU) { 1024 /* 1025 * No need to fudge the MTU since the parent can 1026 * handle extended frames. 1027 */ 1028 ifv->ifv_mtufudge = 0; 1029 } else { 1030 /* 1031 * Fudge the MTU by the encapsulation size. This 1032 * makes us incompatible with strictly compliant 1033 * 802.1Q implementations, but allows us to use 1034 * the feature with other NetBSD implementations, 1035 * which might still be useful. 1036 */ 1037 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1038 } 1039 1040 ifv->ifv_trunk = trunk; 1041 ifp = ifv->ifv_ifp; 1042 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1043 ifp->if_baudrate = p->if_baudrate; 1044 /* 1045 * Copy only a selected subset of flags from the parent. 1046 * Other flags are none of our business. 1047 */ 1048 #define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1049 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1050 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1051 #undef VLAN_COPY_FLAGS 1052 1053 ifp->if_link_state = p->if_link_state; 1054 1055 vlan_capabilities(ifv); 1056 1057 /* 1058 * Set up our ``Ethernet address'' to reflect the underlying 1059 * physical interface's. 1060 */ 1061 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1062 1063 /* 1064 * Configure multicast addresses that may already be 1065 * joined on the vlan device. 1066 */ 1067 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1068 1069 /* We are ready for operation now. */ 1070 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1071 done: 1072 TRUNK_UNLOCK(trunk); 1073 if (error == 0) 1074 EVENTHANDLER_INVOKE(vlan_config, p, ifv->ifv_tag); 1075 VLAN_UNLOCK(); 1076 1077 return (error); 1078 } 1079 1080 static void 1081 vlan_unconfig(struct ifnet *ifp) 1082 { 1083 1084 VLAN_LOCK(); 1085 vlan_unconfig_locked(ifp); 1086 VLAN_UNLOCK(); 1087 } 1088 1089 static void 1090 vlan_unconfig_locked(struct ifnet *ifp) 1091 { 1092 struct ifvlantrunk *trunk; 1093 struct vlan_mc_entry *mc; 1094 struct ifvlan *ifv; 1095 struct ifnet *parent; 1096 1097 VLAN_LOCK_ASSERT(); 1098 1099 ifv = ifp->if_softc; 1100 trunk = ifv->ifv_trunk; 1101 parent = NULL; 1102 1103 if (trunk != NULL) { 1104 struct sockaddr_dl sdl; 1105 1106 TRUNK_LOCK(trunk); 1107 parent = trunk->parent; 1108 1109 /* 1110 * Since the interface is being unconfigured, we need to 1111 * empty the list of multicast groups that we may have joined 1112 * while we were alive from the parent's list. 1113 */ 1114 bzero((char *)&sdl, sizeof(sdl)); 1115 sdl.sdl_len = sizeof(sdl); 1116 sdl.sdl_family = AF_LINK; 1117 sdl.sdl_index = parent->if_index; 1118 sdl.sdl_type = IFT_ETHER; 1119 sdl.sdl_alen = ETHER_ADDR_LEN; 1120 1121 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1122 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1123 ETHER_ADDR_LEN); 1124 1125 /* 1126 * This may fail if the parent interface is 1127 * being detached. Regardless, we should do a 1128 * best effort to free this interface as much 1129 * as possible as all callers expect vlan 1130 * destruction to succeed. 1131 */ 1132 (void)if_delmulti(parent, (struct sockaddr *)&sdl); 1133 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1134 free(mc, M_VLAN); 1135 } 1136 1137 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1138 #ifdef VLAN_ARRAY 1139 trunk->vlans[ifv->ifv_tag] = NULL; 1140 trunk->refcnt--; 1141 #else 1142 vlan_remhash(trunk, ifv); 1143 #endif 1144 ifv->ifv_trunk = NULL; 1145 1146 /* 1147 * Check if we were the last. 1148 */ 1149 if (trunk->refcnt == 0) { 1150 trunk->parent->if_vlantrunk = NULL; 1151 /* 1152 * XXXGL: If some ithread has already entered 1153 * vlan_input() and is now blocked on the trunk 1154 * lock, then it should preempt us right after 1155 * unlock and finish its work. Then we will acquire 1156 * lock again in trunk_destroy(). 1157 */ 1158 TRUNK_UNLOCK(trunk); 1159 trunk_destroy(trunk); 1160 } else 1161 TRUNK_UNLOCK(trunk); 1162 } 1163 1164 /* Disconnect from parent. */ 1165 if (ifv->ifv_pflags) 1166 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1167 ifp->if_mtu = ETHERMTU; 1168 ifp->if_link_state = LINK_STATE_UNKNOWN; 1169 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1170 1171 /* 1172 * Only dispatch an event if vlan was 1173 * attached, otherwise there is nothing 1174 * to cleanup anyway. 1175 */ 1176 if (parent != NULL) 1177 EVENTHANDLER_INVOKE(vlan_unconfig, parent, ifv->ifv_tag); 1178 } 1179 1180 /* Handle a reference counted flag that should be set on the parent as well */ 1181 static int 1182 vlan_setflag(struct ifnet *ifp, int flag, int status, 1183 int (*func)(struct ifnet *, int)) 1184 { 1185 struct ifvlan *ifv; 1186 int error; 1187 1188 /* XXX VLAN_LOCK_ASSERT(); */ 1189 1190 ifv = ifp->if_softc; 1191 status = status ? (ifp->if_flags & flag) : 0; 1192 /* Now "status" contains the flag value or 0 */ 1193 1194 /* 1195 * See if recorded parent's status is different from what 1196 * we want it to be. If it is, flip it. We record parent's 1197 * status in ifv_pflags so that we won't clear parent's flag 1198 * we haven't set. In fact, we don't clear or set parent's 1199 * flags directly, but get or release references to them. 1200 * That's why we can be sure that recorded flags still are 1201 * in accord with actual parent's flags. 1202 */ 1203 if (status != (ifv->ifv_pflags & flag)) { 1204 error = (*func)(PARENT(ifv), status); 1205 if (error) 1206 return (error); 1207 ifv->ifv_pflags &= ~flag; 1208 ifv->ifv_pflags |= status; 1209 } 1210 return (0); 1211 } 1212 1213 /* 1214 * Handle IFF_* flags that require certain changes on the parent: 1215 * if "status" is true, update parent's flags respective to our if_flags; 1216 * if "status" is false, forcedly clear the flags set on parent. 1217 */ 1218 static int 1219 vlan_setflags(struct ifnet *ifp, int status) 1220 { 1221 int error, i; 1222 1223 for (i = 0; vlan_pflags[i].flag; i++) { 1224 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1225 status, vlan_pflags[i].func); 1226 if (error) 1227 return (error); 1228 } 1229 return (0); 1230 } 1231 1232 /* Inform all vlans that their parent has changed link state */ 1233 static void 1234 vlan_link_state(struct ifnet *ifp, int link) 1235 { 1236 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1237 struct ifvlan *ifv; 1238 int i; 1239 1240 TRUNK_LOCK(trunk); 1241 #ifdef VLAN_ARRAY 1242 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1243 if (trunk->vlans[i] != NULL) { 1244 ifv = trunk->vlans[i]; 1245 #else 1246 for (i = 0; i < (1 << trunk->hwidth); i++) 1247 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1248 #endif 1249 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1250 if_link_state_change(ifv->ifv_ifp, 1251 trunk->parent->if_link_state); 1252 } 1253 TRUNK_UNLOCK(trunk); 1254 } 1255 1256 static void 1257 vlan_capabilities(struct ifvlan *ifv) 1258 { 1259 struct ifnet *p = PARENT(ifv); 1260 struct ifnet *ifp = ifv->ifv_ifp; 1261 1262 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1263 1264 /* 1265 * If the parent interface can do checksum offloading 1266 * on VLANs, then propagate its hardware-assisted 1267 * checksumming flags. Also assert that checksum 1268 * offloading requires hardware VLAN tagging. 1269 */ 1270 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1271 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1272 1273 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1274 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1275 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1276 ifp->if_hwassist = p->if_hwassist & (CSUM_IP | CSUM_TCP | 1277 CSUM_UDP | CSUM_SCTP | CSUM_IP_FRAGS | CSUM_FRAGMENT); 1278 } else { 1279 ifp->if_capenable = 0; 1280 ifp->if_hwassist = 0; 1281 } 1282 /* 1283 * If the parent interface can do TSO on VLANs then 1284 * propagate the hardware-assisted flag. TSO on VLANs 1285 * does not necessarily require hardware VLAN tagging. 1286 */ 1287 if (p->if_capabilities & IFCAP_VLAN_HWTSO) 1288 ifp->if_capabilities |= p->if_capabilities & IFCAP_TSO; 1289 if (p->if_capenable & IFCAP_VLAN_HWTSO) { 1290 ifp->if_capenable |= p->if_capenable & IFCAP_TSO; 1291 ifp->if_hwassist |= p->if_hwassist & CSUM_TSO; 1292 } else { 1293 ifp->if_capenable &= ~(p->if_capenable & IFCAP_TSO); 1294 ifp->if_hwassist &= ~(p->if_hwassist & CSUM_TSO); 1295 } 1296 } 1297 1298 static void 1299 vlan_trunk_capabilities(struct ifnet *ifp) 1300 { 1301 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1302 struct ifvlan *ifv; 1303 int i; 1304 1305 TRUNK_LOCK(trunk); 1306 #ifdef VLAN_ARRAY 1307 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1308 if (trunk->vlans[i] != NULL) { 1309 ifv = trunk->vlans[i]; 1310 #else 1311 for (i = 0; i < (1 << trunk->hwidth); i++) { 1312 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1313 #endif 1314 vlan_capabilities(ifv); 1315 } 1316 TRUNK_UNLOCK(trunk); 1317 } 1318 1319 static int 1320 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1321 { 1322 struct ifnet *p; 1323 struct ifreq *ifr; 1324 struct ifvlan *ifv; 1325 struct vlanreq vlr; 1326 int error = 0; 1327 1328 ifr = (struct ifreq *)data; 1329 ifv = ifp->if_softc; 1330 1331 switch (cmd) { 1332 case SIOCGIFMEDIA: 1333 VLAN_LOCK(); 1334 if (TRUNK(ifv) != NULL) { 1335 p = PARENT(ifv); 1336 VLAN_UNLOCK(); 1337 error = (*p->if_ioctl)(p, SIOCGIFMEDIA, data); 1338 /* Limit the result to the parent's current config. */ 1339 if (error == 0) { 1340 struct ifmediareq *ifmr; 1341 1342 ifmr = (struct ifmediareq *)data; 1343 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1344 ifmr->ifm_count = 1; 1345 error = copyout(&ifmr->ifm_current, 1346 ifmr->ifm_ulist, 1347 sizeof(int)); 1348 } 1349 } 1350 } else { 1351 VLAN_UNLOCK(); 1352 error = EINVAL; 1353 } 1354 break; 1355 1356 case SIOCSIFMEDIA: 1357 error = EINVAL; 1358 break; 1359 1360 case SIOCSIFMTU: 1361 /* 1362 * Set the interface MTU. 1363 */ 1364 VLAN_LOCK(); 1365 if (TRUNK(ifv) != NULL) { 1366 if (ifr->ifr_mtu > 1367 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1368 ifr->ifr_mtu < 1369 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1370 error = EINVAL; 1371 else 1372 ifp->if_mtu = ifr->ifr_mtu; 1373 } else 1374 error = EINVAL; 1375 VLAN_UNLOCK(); 1376 break; 1377 1378 case SIOCSETVLAN: 1379 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1380 if (error) 1381 break; 1382 if (vlr.vlr_parent[0] == '\0') { 1383 vlan_unconfig(ifp); 1384 break; 1385 } 1386 p = ifunit(vlr.vlr_parent); 1387 if (p == 0) { 1388 error = ENOENT; 1389 break; 1390 } 1391 /* 1392 * Don't let the caller set up a VLAN tag with 1393 * anything except VLID bits. 1394 */ 1395 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1396 error = EINVAL; 1397 break; 1398 } 1399 error = vlan_config(ifv, p, vlr.vlr_tag); 1400 if (error) 1401 break; 1402 1403 /* Update flags on the parent, if necessary. */ 1404 vlan_setflags(ifp, 1); 1405 break; 1406 1407 case SIOCGETVLAN: 1408 bzero(&vlr, sizeof(vlr)); 1409 VLAN_LOCK(); 1410 if (TRUNK(ifv) != NULL) { 1411 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1412 sizeof(vlr.vlr_parent)); 1413 vlr.vlr_tag = ifv->ifv_tag; 1414 } 1415 VLAN_UNLOCK(); 1416 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1417 break; 1418 1419 case SIOCSIFFLAGS: 1420 /* 1421 * We should propagate selected flags to the parent, 1422 * e.g., promiscuous mode. 1423 */ 1424 if (TRUNK(ifv) != NULL) 1425 error = vlan_setflags(ifp, 1); 1426 break; 1427 1428 case SIOCADDMULTI: 1429 case SIOCDELMULTI: 1430 /* 1431 * If we don't have a parent, just remember the membership for 1432 * when we do. 1433 */ 1434 if (TRUNK(ifv) != NULL) 1435 error = vlan_setmulti(ifp); 1436 break; 1437 1438 default: 1439 error = ether_ioctl(ifp, cmd, data); 1440 } 1441 1442 return (error); 1443 }
Cache object: e61ab80dd612993fd8b484375cfbf07d
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]