if_vlan.c revision 167484
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: head/sys/net/if_vlan.c 167484 2007-03-12 12:42:14Z yar $ 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_inet.h" 45#include "opt_vlan.h" 46 47#include <sys/param.h> 48#include <sys/kernel.h> 49#include <sys/lock.h> 50#include <sys/malloc.h> 51#include <sys/mbuf.h> 52#include <sys/module.h> 53#include <sys/rwlock.h> 54#include <sys/queue.h> 55#include <sys/socket.h> 56#include <sys/sockio.h> 57#include <sys/sysctl.h> 58#include <sys/systm.h> 59 60#include <net/bpf.h> 61#include <net/ethernet.h> 62#include <net/if.h> 63#include <net/if_clone.h> 64#include <net/if_arp.h> 65#include <net/if_dl.h> 66#include <net/if_types.h> 67#include <net/if_vlan_var.h> 68 69#ifdef INET 70#include <netinet/in.h> 71#include <netinet/if_ether.h> 72#endif 73 74#define VLANNAME "vlan" 75#define VLAN_DEF_HWIDTH 4 76#define VLAN_IFFLAGS (IFF_BROADCAST | IFF_MULTICAST) 77 78#define UP_AND_RUNNING(ifp) \ 79 ((ifp)->if_flags & IFF_UP && (ifp)->if_drv_flags & IFF_DRV_RUNNING) 80 81LIST_HEAD(ifvlanhead, ifvlan); 82 83struct ifvlantrunk { 84 struct ifnet *parent; /* parent interface of this trunk */ 85 struct rwlock rw; 86#ifdef VLAN_ARRAY 87#define VLAN_ARRAY_SIZE (EVL_VLID_MASK + 1) 88 struct ifvlan *vlans[VLAN_ARRAY_SIZE]; /* static table */ 89#else 90 struct ifvlanhead *hash; /* dynamic hash-list table */ 91 uint16_t hmask; 92 uint16_t hwidth; 93#endif 94 int refcnt; 95}; 96 97struct vlan_mc_entry { 98 struct ether_addr mc_addr; 99 SLIST_ENTRY(vlan_mc_entry) mc_entries; 100}; 101 102struct ifvlan { 103 struct ifvlantrunk *ifv_trunk; 104 struct ifnet *ifv_ifp; 105#define TRUNK(ifv) ((ifv)->ifv_trunk) 106#define PARENT(ifv) ((ifv)->ifv_trunk->parent) 107 int ifv_pflags; /* special flags we have set on parent */ 108 struct ifv_linkmib { 109 int ifvm_encaplen; /* encapsulation length */ 110 int ifvm_mtufudge; /* MTU fudged by this much */ 111 int ifvm_mintu; /* min transmission unit */ 112 uint16_t ifvm_proto; /* encapsulation ethertype */ 113 uint16_t ifvm_tag; /* tag to apply on packets leaving if */ 114 } ifv_mib; 115 SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead; 116#ifndef VLAN_ARRAY 117 LIST_ENTRY(ifvlan) ifv_list; 118#endif 119}; 120#define ifv_proto ifv_mib.ifvm_proto 121#define ifv_tag ifv_mib.ifvm_tag 122#define ifv_encaplen ifv_mib.ifvm_encaplen 123#define ifv_mtufudge ifv_mib.ifvm_mtufudge 124#define ifv_mintu ifv_mib.ifvm_mintu 125 126/* Special flags we should propagate to parent. */ 127static struct { 128 int flag; 129 int (*func)(struct ifnet *, int); 130} vlan_pflags[] = { 131 {IFF_PROMISC, ifpromisc}, 132 {IFF_ALLMULTI, if_allmulti}, 133 {0, NULL} 134}; 135 136SYSCTL_DECL(_net_link); 137SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 138SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 139 140static int soft_pad = 0; 141SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW, &soft_pad, 0, 142 "pad short frames before tagging"); 143 144static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 145 146static eventhandler_tag ifdetach_tag; 147 148/* 149 * We have a global mutex, that is used to serialize configuration 150 * changes and isn't used in normal packet delivery. 151 * 152 * We also have a per-trunk rwlock, that is locked shared on packet 153 * processing and exclusive when configuration is changed. 154 * 155 * The VLAN_ARRAY substitutes the dynamic hash with a static array 156 * with 4096 entries. In theory this can give a boost in processing, 157 * however on practice it does not. Probably this is because array 158 * is too big to fit into CPU cache. 159 */ 160static struct mtx ifv_mtx; 161#define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, "vlan_global", NULL, MTX_DEF) 162#define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 163#define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 164#define VLAN_LOCK() mtx_lock(&ifv_mtx) 165#define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 166#define TRUNK_LOCK_INIT(trunk) rw_init(&(trunk)->rw, VLANNAME) 167#define TRUNK_LOCK_DESTROY(trunk) rw_destroy(&(trunk)->rw) 168#define TRUNK_LOCK(trunk) rw_wlock(&(trunk)->rw) 169#define TRUNK_UNLOCK(trunk) rw_wunlock(&(trunk)->rw) 170#define TRUNK_LOCK_ASSERT(trunk) rw_assert(&(trunk)->rw, RA_WLOCKED) 171#define TRUNK_RLOCK(trunk) rw_rlock(&(trunk)->rw) 172#define TRUNK_RUNLOCK(trunk) rw_runlock(&(trunk)->rw) 173#define TRUNK_LOCK_RASSERT(trunk) rw_assert(&(trunk)->rw, RA_RLOCKED) 174 175#ifndef VLAN_ARRAY 176static void vlan_inithash(struct ifvlantrunk *trunk); 177static void vlan_freehash(struct ifvlantrunk *trunk); 178static int vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 179static int vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv); 180static void vlan_growhash(struct ifvlantrunk *trunk, int howmuch); 181static __inline struct ifvlan * vlan_gethash(struct ifvlantrunk *trunk, 182 uint16_t tag); 183#endif 184static void trunk_destroy(struct ifvlantrunk *trunk); 185 186static void vlan_start(struct ifnet *ifp); 187static void vlan_init(void *foo); 188static void vlan_input(struct ifnet *ifp, struct mbuf *m); 189static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 190static int vlan_setflag(struct ifnet *ifp, int flag, int status, 191 int (*func)(struct ifnet *, int)); 192static int vlan_setflags(struct ifnet *ifp, int status); 193static int vlan_setmulti(struct ifnet *ifp); 194static int vlan_unconfig(struct ifnet *ifp); 195static int vlan_unconfig_locked(struct ifnet *ifp); 196static int vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag); 197static void vlan_link_state(struct ifnet *ifp, int link); 198static void vlan_capabilities(struct ifvlan *ifv); 199static void vlan_trunk_capabilities(struct ifnet *ifp); 200 201static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 202 const char *, int *); 203static int vlan_clone_match(struct if_clone *, const char *); 204static int vlan_clone_create(struct if_clone *, char *, size_t, caddr_t); 205static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 206 207static void vlan_ifdetach(void *arg, struct ifnet *ifp); 208 209static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 210 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 211 212#ifndef VLAN_ARRAY 213#define HASH(n, m) ((((n) >> 8) ^ ((n) >> 4) ^ (n)) & (m)) 214 215static void 216vlan_inithash(struct ifvlantrunk *trunk) 217{ 218 int i, n; 219 220 /* 221 * The trunk must not be locked here since we call malloc(M_WAITOK). 222 * It is OK in case this function is called before the trunk struct 223 * gets hooked up and becomes visible from other threads. 224 */ 225 226 KASSERT(trunk->hwidth == 0 && trunk->hash == NULL, 227 ("%s: hash already initialized", __func__)); 228 229 trunk->hwidth = VLAN_DEF_HWIDTH; 230 n = 1 << trunk->hwidth; 231 trunk->hmask = n - 1; 232 trunk->hash = malloc(sizeof(struct ifvlanhead) * n, M_VLAN, M_WAITOK); 233 for (i = 0; i < n; i++) 234 LIST_INIT(&trunk->hash[i]); 235} 236 237static void 238vlan_freehash(struct ifvlantrunk *trunk) 239{ 240#ifdef INVARIANTS 241 int i; 242 243 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 244 for (i = 0; i < (1 << trunk->hwidth); i++) 245 KASSERT(LIST_EMPTY(&trunk->hash[i]), 246 ("%s: hash table not empty", __func__)); 247#endif 248 free(trunk->hash, M_VLAN); 249 trunk->hash = NULL; 250 trunk->hwidth = trunk->hmask = 0; 251} 252 253static int 254vlan_inshash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 255{ 256 int i, b; 257 struct ifvlan *ifv2; 258 259 TRUNK_LOCK_ASSERT(trunk); 260 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 261 262 b = 1 << trunk->hwidth; 263 i = HASH(ifv->ifv_tag, trunk->hmask); 264 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 265 if (ifv->ifv_tag == ifv2->ifv_tag) 266 return (EEXIST); 267 268 /* 269 * Grow the hash when the number of vlans exceeds half of the number of 270 * hash buckets squared. This will make the average linked-list length 271 * buckets/2. 272 */ 273 if (trunk->refcnt > (b * b) / 2) { 274 vlan_growhash(trunk, 1); 275 i = HASH(ifv->ifv_tag, trunk->hmask); 276 } 277 LIST_INSERT_HEAD(&trunk->hash[i], ifv, ifv_list); 278 trunk->refcnt++; 279 280 return (0); 281} 282 283static int 284vlan_remhash(struct ifvlantrunk *trunk, struct ifvlan *ifv) 285{ 286 int i, b; 287 struct ifvlan *ifv2; 288 289 TRUNK_LOCK_ASSERT(trunk); 290 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 291 292 b = 1 << trunk->hwidth; 293 i = HASH(ifv->ifv_tag, trunk->hmask); 294 LIST_FOREACH(ifv2, &trunk->hash[i], ifv_list) 295 if (ifv2 == ifv) { 296 trunk->refcnt--; 297 LIST_REMOVE(ifv2, ifv_list); 298 if (trunk->refcnt < (b * b) / 2) 299 vlan_growhash(trunk, -1); 300 return (0); 301 } 302 303 panic("%s: vlan not found\n", __func__); 304 return (ENOENT); /*NOTREACHED*/ 305} 306 307/* 308 * Grow the hash larger or smaller if memory permits. 309 */ 310static void 311vlan_growhash(struct ifvlantrunk *trunk, int howmuch) 312{ 313 314 struct ifvlan *ifv; 315 struct ifvlanhead *hash2; 316 int hwidth2, i, j, n, n2; 317 318 TRUNK_LOCK_ASSERT(trunk); 319 KASSERT(trunk->hwidth > 0, ("%s: hwidth not positive", __func__)); 320 321 if (howmuch == 0) { 322 /* Harmless yet obvious coding error */ 323 printf("%s: howmuch is 0\n", __func__); 324 return; 325 } 326 327 hwidth2 = trunk->hwidth + howmuch; 328 n = 1 << trunk->hwidth; 329 n2 = 1 << hwidth2; 330 /* Do not shrink the table below the default */ 331 if (hwidth2 < VLAN_DEF_HWIDTH) 332 return; 333 334 /* M_NOWAIT because we're called with trunk mutex held */ 335 hash2 = malloc(sizeof(struct ifvlanhead) * n2, M_VLAN, M_NOWAIT); 336 if (hash2 == NULL) { 337 printf("%s: out of memory -- hash size not changed\n", 338 __func__); 339 return; /* We can live with the old hash table */ 340 } 341 for (j = 0; j < n2; j++) 342 LIST_INIT(&hash2[j]); 343 for (i = 0; i < n; i++) 344 while ((ifv = LIST_FIRST(&trunk->hash[i])) != NULL) { 345 LIST_REMOVE(ifv, ifv_list); 346 j = HASH(ifv->ifv_tag, n2 - 1); 347 LIST_INSERT_HEAD(&hash2[j], ifv, ifv_list); 348 } 349 free(trunk->hash, M_VLAN); 350 trunk->hash = hash2; 351 trunk->hwidth = hwidth2; 352 trunk->hmask = n2 - 1; 353} 354 355static __inline struct ifvlan * 356vlan_gethash(struct ifvlantrunk *trunk, uint16_t tag) 357{ 358 struct ifvlan *ifv; 359 360 TRUNK_LOCK_RASSERT(trunk); 361 362 LIST_FOREACH(ifv, &trunk->hash[HASH(tag, trunk->hmask)], ifv_list) 363 if (ifv->ifv_tag == tag) 364 return (ifv); 365 return (NULL); 366} 367 368#if 0 369/* Debugging code to view the hashtables. */ 370static void 371vlan_dumphash(struct ifvlantrunk *trunk) 372{ 373 int i; 374 struct ifvlan *ifv; 375 376 for (i = 0; i < (1 << trunk->hwidth); i++) { 377 printf("%d: ", i); 378 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 379 printf("%s ", ifv->ifv_ifp->if_xname); 380 printf("\n"); 381 } 382} 383#endif /* 0 */ 384#endif /* !VLAN_ARRAY */ 385 386static void 387trunk_destroy(struct ifvlantrunk *trunk) 388{ 389 VLAN_LOCK_ASSERT(); 390 391 TRUNK_LOCK(trunk); 392#ifndef VLAN_ARRAY 393 vlan_freehash(trunk); 394#endif 395 trunk->parent->if_vlantrunk = NULL; 396 TRUNK_UNLOCK(trunk); 397 TRUNK_LOCK_DESTROY(trunk); 398 free(trunk, M_VLAN); 399} 400 401/* 402 * Program our multicast filter. What we're actually doing is 403 * programming the multicast filter of the parent. This has the 404 * side effect of causing the parent interface to receive multicast 405 * traffic that it doesn't really want, which ends up being discarded 406 * later by the upper protocol layers. Unfortunately, there's no way 407 * to avoid this: there really is only one physical interface. 408 * 409 * XXX: There is a possible race here if more than one thread is 410 * modifying the multicast state of the vlan interface at the same time. 411 */ 412static int 413vlan_setmulti(struct ifnet *ifp) 414{ 415 struct ifnet *ifp_p; 416 struct ifmultiaddr *ifma, *rifma = NULL; 417 struct ifvlan *sc; 418 struct vlan_mc_entry *mc; 419 struct sockaddr_dl sdl; 420 int error; 421 422 /*VLAN_LOCK_ASSERT();*/ 423 424 /* Find the parent. */ 425 sc = ifp->if_softc; 426 ifp_p = PARENT(sc); 427 428 bzero((char *)&sdl, sizeof(sdl)); 429 sdl.sdl_len = sizeof(sdl); 430 sdl.sdl_family = AF_LINK; 431 sdl.sdl_index = ifp_p->if_index; 432 sdl.sdl_type = IFT_ETHER; 433 sdl.sdl_alen = ETHER_ADDR_LEN; 434 435 /* First, remove any existing filter entries. */ 436 while ((mc = SLIST_FIRST(&sc->vlan_mc_listhead)) != NULL) { 437 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 438 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 439 if (error) 440 return (error); 441 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 442 free(mc, M_VLAN); 443 } 444 445 /* Now program new ones. */ 446 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 447 if (ifma->ifma_addr->sa_family != AF_LINK) 448 continue; 449 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 450 if (mc == NULL) 451 return (ENOMEM); 452 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 453 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 454 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 455 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 456 LLADDR(&sdl), ETHER_ADDR_LEN); 457 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 458 if (error) 459 return (error); 460 } 461 462 return (0); 463} 464 465/* 466 * A handler for network interface departure events. 467 * Track departure of trunks here so that we don't access invalid 468 * pointers or whatever if a trunk is ripped from under us, e.g., 469 * by ejecting its hot-plug card. 470 */ 471static void 472vlan_ifdetach(void *arg __unused, struct ifnet *ifp) 473{ 474 struct ifvlan *ifv; 475 int i; 476 477 /* 478 * Check if it's a trunk interface first of all 479 * to avoid needless locking. 480 */ 481 if (ifp->if_vlantrunk == NULL) 482 return; 483 484 VLAN_LOCK(); 485 /* 486 * OK, it's a trunk. Loop over and detach all vlan's on it. 487 * Check trunk pointer after each vlan_unconfig() as it will 488 * free it and set to NULL after the last vlan was detached. 489 */ 490#ifdef VLAN_ARRAY 491 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 492 if ((ifv = ifp->if_vlantrunk->vlans[i])) { 493 vlan_unconfig_locked(ifv->ifv_ifp); 494 if (ifp->if_vlantrunk == NULL) 495 break; 496 } 497#else /* VLAN_ARRAY */ 498restart: 499 for (i = 0; i < (1 << ifp->if_vlantrunk->hwidth); i++) 500 if ((ifv = LIST_FIRST(&ifp->if_vlantrunk->hash[i]))) { 501 vlan_unconfig_locked(ifv->ifv_ifp); 502 if (ifp->if_vlantrunk) 503 goto restart; /* trunk->hwidth can change */ 504 else 505 break; 506 } 507#endif /* VLAN_ARRAY */ 508 /* Trunk should have been destroyed in vlan_unconfig(). */ 509 KASSERT(ifp->if_vlantrunk == NULL, ("%s: purge failed", __func__)); 510 VLAN_UNLOCK(); 511} 512 513/* 514 * VLAN support can be loaded as a module. The only place in the 515 * system that's intimately aware of this is ether_input. We hook 516 * into this code through vlan_input_p which is defined there and 517 * set here. Noone else in the system should be aware of this so 518 * we use an explicit reference here. 519 */ 520extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 521 522/* For if_link_state_change() eyes only... */ 523extern void (*vlan_link_state_p)(struct ifnet *, int); 524 525static int 526vlan_modevent(module_t mod, int type, void *data) 527{ 528 529 switch (type) { 530 case MOD_LOAD: 531 ifdetach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 532 vlan_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 533 if (ifdetach_tag == NULL) 534 return (ENOMEM); 535 VLAN_LOCK_INIT(); 536 vlan_input_p = vlan_input; 537 vlan_link_state_p = vlan_link_state; 538 vlan_trunk_cap_p = vlan_trunk_capabilities; 539 if_clone_attach(&vlan_cloner); 540 if (bootverbose) 541 printf("vlan: initialized, using " 542#ifdef VLAN_ARRAY 543 "full-size arrays" 544#else 545 "hash tables with chaining" 546#endif 547 548 "\n"); 549 break; 550 case MOD_UNLOAD: 551 if_clone_detach(&vlan_cloner); 552 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); 553 vlan_input_p = NULL; 554 vlan_link_state_p = NULL; 555 vlan_trunk_cap_p = NULL; 556 VLAN_LOCK_DESTROY(); 557 if (bootverbose) 558 printf("vlan: unloaded\n"); 559 break; 560 default: 561 return (EOPNOTSUPP); 562 } 563 return (0); 564} 565 566static moduledata_t vlan_mod = { 567 "if_vlan", 568 vlan_modevent, 569 0 570}; 571 572DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 573MODULE_VERSION(if_vlan, 3); 574MODULE_DEPEND(if_vlan, miibus, 1, 1, 1); 575 576static struct ifnet * 577vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 578{ 579 const char *cp; 580 struct ifnet *ifp; 581 int t = 0; 582 583 /* Check for <etherif>.<vlan> style interface names. */ 584 IFNET_RLOCK(); 585 TAILQ_FOREACH(ifp, &ifnet, if_link) { 586 if (ifp->if_type != IFT_ETHER) 587 continue; 588 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 589 continue; 590 cp = name + strlen(ifp->if_xname); 591 if (*cp != '.') 592 continue; 593 for(; *cp != '\0'; cp++) { 594 if (*cp < '0' || *cp > '9') 595 continue; 596 t = (t * 10) + (*cp - '0'); 597 } 598 if (tag != NULL) 599 *tag = t; 600 break; 601 } 602 IFNET_RUNLOCK(); 603 604 return (ifp); 605} 606 607static int 608vlan_clone_match(struct if_clone *ifc, const char *name) 609{ 610 const char *cp; 611 612 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 613 return (1); 614 615 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 616 return (0); 617 for (cp = name + 4; *cp != '\0'; cp++) { 618 if (*cp < '0' || *cp > '9') 619 return (0); 620 } 621 622 return (1); 623} 624 625static int 626vlan_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 627{ 628 char *dp; 629 int wildcard; 630 int unit; 631 int error; 632 int tag; 633 int ethertag; 634 struct ifvlan *ifv; 635 struct ifnet *ifp; 636 struct ifnet *p; 637 struct vlanreq vlr; 638 static const u_char eaddr[6]; /* 00:00:00:00:00:00 */ 639 640 /* 641 * There are 3 (ugh) ways to specify the cloned device: 642 * o pass a parameter block with the clone request. 643 * o specify parameters in the text of the clone device name 644 * o specify no parameters and get an unattached device that 645 * must be configured separately. 646 * The first technique is preferred; the latter two are 647 * supported for backwards compatibilty. 648 */ 649 if (params) { 650 error = copyin(params, &vlr, sizeof(vlr)); 651 if (error) 652 return error; 653 p = ifunit(vlr.vlr_parent); 654 if (p == NULL) 655 return ENXIO; 656 /* 657 * Don't let the caller set up a VLAN tag with 658 * anything except VLID bits. 659 */ 660 if (vlr.vlr_tag & ~EVL_VLID_MASK) 661 return (EINVAL); 662 error = ifc_name2unit(name, &unit); 663 if (error != 0) 664 return (error); 665 666 ethertag = 1; 667 tag = vlr.vlr_tag; 668 wildcard = (unit < 0); 669 } else if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 670 ethertag = 1; 671 unit = -1; 672 wildcard = 0; 673 674 /* 675 * Don't let the caller set up a VLAN tag with 676 * anything except VLID bits. 677 */ 678 if (tag & ~EVL_VLID_MASK) 679 return (EINVAL); 680 } else { 681 ethertag = 0; 682 683 error = ifc_name2unit(name, &unit); 684 if (error != 0) 685 return (error); 686 687 wildcard = (unit < 0); 688 } 689 690 error = ifc_alloc_unit(ifc, &unit); 691 if (error != 0) 692 return (error); 693 694 /* In the wildcard case, we need to update the name. */ 695 if (wildcard) { 696 for (dp = name; *dp != '\0'; dp++); 697 if (snprintf(dp, len - (dp-name), "%d", unit) > 698 len - (dp-name) - 1) { 699 panic("%s: interface name too long", __func__); 700 } 701 } 702 703 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 704 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 705 if (ifp == NULL) { 706 ifc_free_unit(ifc, unit); 707 free(ifv, M_VLAN); 708 return (ENOSPC); 709 } 710 SLIST_INIT(&ifv->vlan_mc_listhead); 711 712 ifp->if_softc = ifv; 713 /* 714 * Set the name manually rather than using if_initname because 715 * we don't conform to the default naming convention for interfaces. 716 */ 717 strlcpy(ifp->if_xname, name, IFNAMSIZ); 718 ifp->if_dname = ifc->ifc_name; 719 ifp->if_dunit = unit; 720 /* NB: flags are not set here */ 721 ifp->if_linkmib = &ifv->ifv_mib; 722 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 723 /* NB: mtu is not set here */ 724 725 ifp->if_init = vlan_init; 726 ifp->if_start = vlan_start; 727 ifp->if_ioctl = vlan_ioctl; 728 ifp->if_snd.ifq_maxlen = ifqmaxlen; 729 ifp->if_flags = VLAN_IFFLAGS; 730 ether_ifattach(ifp, eaddr); 731 /* Now undo some of the damage... */ 732 ifp->if_baudrate = 0; 733 ifp->if_type = IFT_L2VLAN; 734 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 735 736 if (ethertag) { 737 error = vlan_config(ifv, p, tag); 738 if (error != 0) { 739 /* 740 * Since we've partialy failed, we need to back 741 * out all the way, otherwise userland could get 742 * confused. Thus, we destroy the interface. 743 */ 744 ether_ifdetach(ifp); 745 vlan_unconfig(ifp); 746 if_free_type(ifp, IFT_ETHER); 747 free(ifv, M_VLAN); 748 749 return (error); 750 } 751 752 /* Update flags on the parent, if necessary. */ 753 vlan_setflags(ifp, 1); 754 } 755 756 return (0); 757} 758 759static int 760vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 761{ 762 struct ifvlan *ifv = ifp->if_softc; 763 int unit = ifp->if_dunit; 764 765 ether_ifdetach(ifp); /* first, remove it from system-wide lists */ 766 vlan_unconfig(ifp); /* now it can be unconfigured and freed */ 767 if_free_type(ifp, IFT_ETHER); 768 free(ifv, M_VLAN); 769 ifc_free_unit(ifc, unit); 770 771 return (0); 772} 773 774/* 775 * The ifp->if_init entry point for vlan(4) is a no-op. 776 */ 777static void 778vlan_init(void *foo __unused) 779{ 780} 781 782/* 783 * The if_start method for vlan(4) interface. It doesn't 784 * raises the IFF_DRV_OACTIVE flag, since it is called 785 * only from IFQ_HANDOFF() macro in ether_output_frame(). 786 * If the interface queue is full, and vlan_start() is 787 * not called, the queue would never get emptied and 788 * interface would stall forever. 789 */ 790static void 791vlan_start(struct ifnet *ifp) 792{ 793 struct ifvlan *ifv; 794 struct ifnet *p; 795 struct mbuf *m; 796 int error; 797 798 ifv = ifp->if_softc; 799 p = PARENT(ifv); 800 801 for (;;) { 802 IF_DEQUEUE(&ifp->if_snd, m); 803 if (m == NULL) 804 break; 805 BPF_MTAP(ifp, m); 806 807 /* 808 * Do not run parent's if_start() if the parent is not up, 809 * or parent's driver will cause a system crash. 810 */ 811 if (!UP_AND_RUNNING(p)) { 812 m_freem(m); 813 ifp->if_collisions++; 814 continue; 815 } 816 817 /* 818 * Pad the frame to the minimum size allowed if told to. 819 * This option is in accord with IEEE Std 802.1Q, 2003 Ed., 820 * paragraph C.4.4.3.b. It can help to work around buggy 821 * bridges that violate paragraph C.4.4.3.a from the same 822 * document, i.e., fail to pad short frames after untagging. 823 * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but 824 * untagging it will produce a 62-byte frame, which is a runt 825 * and requires padding. There are VLAN-enabled network 826 * devices that just discard such runts instead or mishandle 827 * them somehow. 828 */ 829 if (soft_pad) { 830 static char pad[8]; /* just zeros */ 831 int n; 832 833 for (n = ETHERMIN + ETHER_HDR_LEN - m->m_pkthdr.len; 834 n > 0; n -= sizeof(pad)) 835 if (!m_append(m, min(n, sizeof(pad)), pad)) 836 break; 837 838 if (n > 0) { 839 if_printf(ifp, "cannot pad short frame\n"); 840 ifp->if_oerrors++; 841 m_freem(m); 842 continue; 843 } 844 } 845 846 /* 847 * If underlying interface can do VLAN tag insertion itself, 848 * just pass the packet along. However, we need some way to 849 * tell the interface where the packet came from so that it 850 * knows how to find the VLAN tag to use, so we attach a 851 * packet tag that holds it. 852 */ 853 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 854 m->m_pkthdr.ether_vtag = ifv->ifv_tag; 855 m->m_flags |= M_VLANTAG; 856 } else { 857 struct ether_vlan_header *evl; 858 859 M_PREPEND(m, ifv->ifv_encaplen, M_DONTWAIT); 860 if (m == NULL) { 861 if_printf(ifp, 862 "unable to prepend VLAN header\n"); 863 ifp->if_oerrors++; 864 continue; 865 } 866 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */ 867 868 if (m->m_len < sizeof(*evl)) { 869 m = m_pullup(m, sizeof(*evl)); 870 if (m == NULL) { 871 if_printf(ifp, 872 "cannot pullup VLAN header\n"); 873 ifp->if_oerrors++; 874 continue; 875 } 876 } 877 878 /* 879 * Transform the Ethernet header into an Ethernet header 880 * with 802.1Q encapsulation. 881 */ 882 evl = mtod(m, struct ether_vlan_header *); 883 bcopy((char *)evl + ifv->ifv_encaplen, 884 (char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN); 885 evl->evl_encap_proto = htons(ifv->ifv_proto); 886 evl->evl_tag = htons(ifv->ifv_tag); 887#ifdef DEBUG 888 printf("%s: %*D\n", __func__, (int)sizeof(*evl), 889 (unsigned char *)evl, ":"); 890#endif 891 } 892 893 /* 894 * Send it, precisely as ether_output() would have. 895 * We are already running at splimp. 896 */ 897 IFQ_HANDOFF(p, m, error); 898 if (!error) 899 ifp->if_opackets++; 900 else 901 ifp->if_oerrors++; 902 } 903} 904 905static void 906vlan_input(struct ifnet *ifp, struct mbuf *m) 907{ 908 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 909 struct ifvlan *ifv; 910 uint16_t tag; 911 912 KASSERT(trunk != NULL, ("%s: no trunk", __func__)); 913 914 if (m->m_flags & M_VLANTAG) { 915 /* 916 * Packet is tagged, but m contains a normal 917 * Ethernet frame; the tag is stored out-of-band. 918 */ 919 tag = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag); 920 m->m_flags &= ~M_VLANTAG; 921 } else { 922 struct ether_vlan_header *evl; 923 924 /* 925 * Packet is tagged in-band as specified by 802.1q. 926 */ 927 switch (ifp->if_type) { 928 case IFT_ETHER: 929 if (m->m_len < sizeof(*evl) && 930 (m = m_pullup(m, sizeof(*evl))) == NULL) { 931 if_printf(ifp, "cannot pullup VLAN header\n"); 932 return; 933 } 934 evl = mtod(m, struct ether_vlan_header *); 935 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 936 937 /* 938 * Remove the 802.1q header by copying the Ethernet 939 * addresses over it and adjusting the beginning of 940 * the data in the mbuf. The encapsulated Ethernet 941 * type field is already in place. 942 */ 943 bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN, 944 ETHER_HDR_LEN - ETHER_TYPE_LEN); 945 m_adj(m, ETHER_VLAN_ENCAP_LEN); 946 break; 947 948 default: 949#ifdef INVARIANTS 950 panic("%s: %s has unsupported if_type %u", 951 __func__, ifp->if_xname, ifp->if_type); 952#endif 953 m_freem(m); 954 ifp->if_noproto++; 955 return; 956 } 957 } 958 959 TRUNK_RLOCK(trunk); 960#ifdef VLAN_ARRAY 961 ifv = trunk->vlans[tag]; 962#else 963 ifv = vlan_gethash(trunk, tag); 964#endif 965 if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) { 966 TRUNK_RUNLOCK(trunk); 967 m_freem(m); 968 ifp->if_noproto++; 969 return; 970 } 971 TRUNK_RUNLOCK(trunk); 972 973 m->m_pkthdr.rcvif = ifv->ifv_ifp; 974 ifv->ifv_ifp->if_ipackets++; 975 976 /* Pass it back through the parent's input routine. */ 977 (*ifp->if_input)(ifv->ifv_ifp, m); 978} 979 980static int 981vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t tag) 982{ 983 struct ifvlantrunk *trunk; 984 struct ifnet *ifp; 985 int error = 0; 986 987 /* VID numbers 0x0 and 0xFFF are reserved */ 988 if (tag == 0 || tag == 0xFFF) 989 return (EINVAL); 990 if (p->if_type != IFT_ETHER) 991 return (EPROTONOSUPPORT); 992 if ((p->if_flags & VLAN_IFFLAGS) != VLAN_IFFLAGS) 993 return (EPROTONOSUPPORT); 994 if (ifv->ifv_trunk) 995 return (EBUSY); 996 997 if (p->if_vlantrunk == NULL) { 998 trunk = malloc(sizeof(struct ifvlantrunk), 999 M_VLAN, M_WAITOK | M_ZERO); 1000#ifndef VLAN_ARRAY 1001 vlan_inithash(trunk); 1002#endif 1003 VLAN_LOCK(); 1004 if (p->if_vlantrunk != NULL) { 1005 /* A race that that is very unlikely to be hit. */ 1006#ifndef VLAN_ARRAY 1007 vlan_freehash(trunk); 1008#endif 1009 free(trunk, M_VLAN); 1010 goto exists; 1011 } 1012 TRUNK_LOCK_INIT(trunk); 1013 TRUNK_LOCK(trunk); 1014 p->if_vlantrunk = trunk; 1015 trunk->parent = p; 1016 } else { 1017 VLAN_LOCK(); 1018exists: 1019 trunk = p->if_vlantrunk; 1020 TRUNK_LOCK(trunk); 1021 } 1022 1023 ifv->ifv_tag = tag; /* must set this before vlan_inshash() */ 1024#ifdef VLAN_ARRAY 1025 if (trunk->vlans[tag] != NULL) { 1026 error = EEXIST; 1027 goto done; 1028 } 1029 trunk->vlans[tag] = ifv; 1030 trunk->refcnt++; 1031#else 1032 error = vlan_inshash(trunk, ifv); 1033 if (error) 1034 goto done; 1035#endif 1036 ifv->ifv_proto = ETHERTYPE_VLAN; 1037 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 1038 ifv->ifv_mintu = ETHERMIN; 1039 ifv->ifv_pflags = 0; 1040 1041 /* 1042 * If the parent supports the VLAN_MTU capability, 1043 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 1044 * use it. 1045 */ 1046 if (p->if_capenable & IFCAP_VLAN_MTU) { 1047 /* 1048 * No need to fudge the MTU since the parent can 1049 * handle extended frames. 1050 */ 1051 ifv->ifv_mtufudge = 0; 1052 } else { 1053 /* 1054 * Fudge the MTU by the encapsulation size. This 1055 * makes us incompatible with strictly compliant 1056 * 802.1Q implementations, but allows us to use 1057 * the feature with other NetBSD implementations, 1058 * which might still be useful. 1059 */ 1060 ifv->ifv_mtufudge = ifv->ifv_encaplen; 1061 } 1062 1063 ifv->ifv_trunk = trunk; 1064 ifp = ifv->ifv_ifp; 1065 ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 1066 ifp->if_baudrate = p->if_baudrate; 1067 /* 1068 * Copy only a selected subset of flags from the parent. 1069 * Other flags are none of our business. 1070 */ 1071#define VLAN_COPY_FLAGS (IFF_SIMPLEX) 1072 ifp->if_flags &= ~VLAN_COPY_FLAGS; 1073 ifp->if_flags |= p->if_flags & VLAN_COPY_FLAGS; 1074#undef VLAN_COPY_FLAGS 1075 1076 ifp->if_link_state = p->if_link_state; 1077 1078 vlan_capabilities(ifv); 1079 1080 /* 1081 * Set up our ``Ethernet address'' to reflect the underlying 1082 * physical interface's. 1083 */ 1084 bcopy(IF_LLADDR(p), IF_LLADDR(ifp), ETHER_ADDR_LEN); 1085 1086 /* 1087 * Configure multicast addresses that may already be 1088 * joined on the vlan device. 1089 */ 1090 (void)vlan_setmulti(ifp); /* XXX: VLAN lock held */ 1091 1092 /* We are ready for operation now. */ 1093 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1094done: 1095 TRUNK_UNLOCK(trunk); 1096 VLAN_UNLOCK(); 1097 1098 return (error); 1099} 1100 1101static int 1102vlan_unconfig(struct ifnet *ifp) 1103{ 1104 int ret; 1105 1106 VLAN_LOCK(); 1107 ret = vlan_unconfig_locked(ifp); 1108 VLAN_UNLOCK(); 1109 return (ret); 1110} 1111 1112static int 1113vlan_unconfig_locked(struct ifnet *ifp) 1114{ 1115 struct ifvlantrunk *trunk; 1116 struct vlan_mc_entry *mc; 1117 struct ifvlan *ifv; 1118 int error; 1119 1120 VLAN_LOCK_ASSERT(); 1121 1122 ifv = ifp->if_softc; 1123 trunk = ifv->ifv_trunk; 1124 1125 if (trunk) { 1126 struct sockaddr_dl sdl; 1127 struct ifnet *p = trunk->parent; 1128 1129 TRUNK_LOCK(trunk); 1130 1131 /* 1132 * Since the interface is being unconfigured, we need to 1133 * empty the list of multicast groups that we may have joined 1134 * while we were alive from the parent's list. 1135 */ 1136 bzero((char *)&sdl, sizeof(sdl)); 1137 sdl.sdl_len = sizeof(sdl); 1138 sdl.sdl_family = AF_LINK; 1139 sdl.sdl_index = p->if_index; 1140 sdl.sdl_type = IFT_ETHER; 1141 sdl.sdl_alen = ETHER_ADDR_LEN; 1142 1143 while ((mc = SLIST_FIRST(&ifv->vlan_mc_listhead)) != NULL) { 1144 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 1145 ETHER_ADDR_LEN); 1146 error = if_delmulti(p, (struct sockaddr *)&sdl); 1147 if (error) 1148 return (error); 1149 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 1150 free(mc, M_VLAN); 1151 } 1152 1153 vlan_setflags(ifp, 0); /* clear special flags on parent */ 1154#ifdef VLAN_ARRAY 1155 trunk->vlans[ifv->ifv_tag] = NULL; 1156 trunk->refcnt--; 1157#else 1158 vlan_remhash(trunk, ifv); 1159#endif 1160 ifv->ifv_trunk = NULL; 1161 1162 /* 1163 * Check if we were the last. 1164 */ 1165 if (trunk->refcnt == 0) { 1166 trunk->parent->if_vlantrunk = NULL; 1167 /* 1168 * XXXGL: If some ithread has already entered 1169 * vlan_input() and is now blocked on the trunk 1170 * lock, then it should preempt us right after 1171 * unlock and finish its work. Then we will acquire 1172 * lock again in trunk_destroy(). 1173 */ 1174 TRUNK_UNLOCK(trunk); 1175 trunk_destroy(trunk); 1176 } else 1177 TRUNK_UNLOCK(trunk); 1178 } 1179 1180 /* Disconnect from parent. */ 1181 if (ifv->ifv_pflags) 1182 if_printf(ifp, "%s: ifv_pflags unclean\n", __func__); 1183 ifp->if_mtu = ETHERMTU; 1184 ifp->if_link_state = LINK_STATE_UNKNOWN; 1185 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1186 1187 return (0); 1188} 1189 1190/* Handle a reference counted flag that should be set on the parent as well */ 1191static int 1192vlan_setflag(struct ifnet *ifp, int flag, int status, 1193 int (*func)(struct ifnet *, int)) 1194{ 1195 struct ifvlan *ifv; 1196 int error; 1197 1198 /* XXX VLAN_LOCK_ASSERT(); */ 1199 1200 ifv = ifp->if_softc; 1201 status = status ? (ifp->if_flags & flag) : 0; 1202 /* Now "status" contains the flag value or 0 */ 1203 1204 /* 1205 * See if recorded parent's status is different from what 1206 * we want it to be. If it is, flip it. We record parent's 1207 * status in ifv_pflags so that we won't clear parent's flag 1208 * we haven't set. In fact, we don't clear or set parent's 1209 * flags directly, but get or release references to them. 1210 * That's why we can be sure that recorded flags still are 1211 * in accord with actual parent's flags. 1212 */ 1213 if (status != (ifv->ifv_pflags & flag)) { 1214 error = (*func)(PARENT(ifv), status); 1215 if (error) 1216 return (error); 1217 ifv->ifv_pflags &= ~flag; 1218 ifv->ifv_pflags |= status; 1219 } 1220 return (0); 1221} 1222 1223/* 1224 * Handle IFF_* flags that require certain changes on the parent: 1225 * if "status" is true, update parent's flags respective to our if_flags; 1226 * if "status" is false, forcedly clear the flags set on parent. 1227 */ 1228static int 1229vlan_setflags(struct ifnet *ifp, int status) 1230{ 1231 int error, i; 1232 1233 for (i = 0; vlan_pflags[i].flag; i++) { 1234 error = vlan_setflag(ifp, vlan_pflags[i].flag, 1235 status, vlan_pflags[i].func); 1236 if (error) 1237 return (error); 1238 } 1239 return (0); 1240} 1241 1242/* Inform all vlans that their parent has changed link state */ 1243static void 1244vlan_link_state(struct ifnet *ifp, int link) 1245{ 1246 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1247 struct ifvlan *ifv; 1248 int i; 1249 1250 TRUNK_LOCK(trunk); 1251#ifdef VLAN_ARRAY 1252 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1253 if (trunk->vlans[i] != NULL) { 1254 ifv = trunk->vlans[i]; 1255#else 1256 for (i = 0; i < (1 << trunk->hwidth); i++) 1257 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) { 1258#endif 1259 ifv->ifv_ifp->if_baudrate = trunk->parent->if_baudrate; 1260 if_link_state_change(ifv->ifv_ifp, 1261 trunk->parent->if_link_state); 1262 } 1263 TRUNK_UNLOCK(trunk); 1264} 1265 1266static void 1267vlan_capabilities(struct ifvlan *ifv) 1268{ 1269 struct ifnet *p = PARENT(ifv); 1270 struct ifnet *ifp = ifv->ifv_ifp; 1271 1272 TRUNK_LOCK_ASSERT(TRUNK(ifv)); 1273 1274 /* 1275 * If the parent interface can do checksum offloading 1276 * on VLANs, then propagate its hardware-assisted 1277 * checksumming flags. Also assert that checksum 1278 * offloading requires hardware VLAN tagging. 1279 */ 1280 if (p->if_capabilities & IFCAP_VLAN_HWCSUM) 1281 ifp->if_capabilities = p->if_capabilities & IFCAP_HWCSUM; 1282 1283 if (p->if_capenable & IFCAP_VLAN_HWCSUM && 1284 p->if_capenable & IFCAP_VLAN_HWTAGGING) { 1285 ifp->if_capenable = p->if_capenable & IFCAP_HWCSUM; 1286 ifp->if_hwassist = p->if_hwassist; 1287 } else { 1288 ifp->if_capenable = 0; 1289 ifp->if_hwassist = 0; 1290 } 1291} 1292 1293static void 1294vlan_trunk_capabilities(struct ifnet *ifp) 1295{ 1296 struct ifvlantrunk *trunk = ifp->if_vlantrunk; 1297 struct ifvlan *ifv; 1298 int i; 1299 1300 TRUNK_LOCK(trunk); 1301#ifdef VLAN_ARRAY 1302 for (i = 0; i < VLAN_ARRAY_SIZE; i++) 1303 if (trunk->vlans[i] != NULL) { 1304 ifv = trunk->vlans[i]; 1305#else 1306 for (i = 0; i < (1 << trunk->hwidth); i++) { 1307 LIST_FOREACH(ifv, &trunk->hash[i], ifv_list) 1308#endif 1309 vlan_capabilities(ifv); 1310 } 1311 TRUNK_UNLOCK(trunk); 1312} 1313 1314static int 1315vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 1316{ 1317 struct ifaddr *ifa; 1318 struct ifnet *p; 1319 struct ifreq *ifr; 1320 struct ifvlan *ifv; 1321 struct vlanreq vlr; 1322 int error = 0; 1323 1324 ifr = (struct ifreq *)data; 1325 ifa = (struct ifaddr *)data; 1326 ifv = ifp->if_softc; 1327 1328 switch (cmd) { 1329 case SIOCSIFADDR: 1330 ifp->if_flags |= IFF_UP; 1331 1332 switch (ifa->ifa_addr->sa_family) { 1333#ifdef INET 1334 case AF_INET: 1335 arp_ifinit(ifv->ifv_ifp, ifa); 1336 break; 1337#endif 1338 default: 1339 break; 1340 } 1341 break; 1342 1343 case SIOCGIFADDR: 1344 { 1345 struct sockaddr *sa; 1346 1347 sa = (struct sockaddr *) &ifr->ifr_data; 1348 bcopy(IF_LLADDR(ifp), (caddr_t)sa->sa_data, 1349 ETHER_ADDR_LEN); 1350 } 1351 break; 1352 1353 case SIOCGIFMEDIA: 1354 VLAN_LOCK(); 1355 if (TRUNK(ifv) != NULL) { 1356 error = (*PARENT(ifv)->if_ioctl)(PARENT(ifv), 1357 SIOCGIFMEDIA, data); 1358 VLAN_UNLOCK(); 1359 /* Limit the result to the parent's current config. */ 1360 if (error == 0) { 1361 struct ifmediareq *ifmr; 1362 1363 ifmr = (struct ifmediareq *)data; 1364 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 1365 ifmr->ifm_count = 1; 1366 error = copyout(&ifmr->ifm_current, 1367 ifmr->ifm_ulist, 1368 sizeof(int)); 1369 } 1370 } 1371 } else { 1372 VLAN_UNLOCK(); 1373 error = EINVAL; 1374 } 1375 break; 1376 1377 case SIOCSIFMEDIA: 1378 error = EINVAL; 1379 break; 1380 1381 case SIOCSIFMTU: 1382 /* 1383 * Set the interface MTU. 1384 */ 1385 VLAN_LOCK(); 1386 if (TRUNK(ifv) != NULL) { 1387 if (ifr->ifr_mtu > 1388 (PARENT(ifv)->if_mtu - ifv->ifv_mtufudge) || 1389 ifr->ifr_mtu < 1390 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 1391 error = EINVAL; 1392 else 1393 ifp->if_mtu = ifr->ifr_mtu; 1394 } else 1395 error = EINVAL; 1396 VLAN_UNLOCK(); 1397 break; 1398 1399 case SIOCSETVLAN: 1400 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 1401 if (error) 1402 break; 1403 if (vlr.vlr_parent[0] == '\0') { 1404 vlan_unconfig(ifp); 1405 break; 1406 } 1407 p = ifunit(vlr.vlr_parent); 1408 if (p == 0) { 1409 error = ENOENT; 1410 break; 1411 } 1412 /* 1413 * Don't let the caller set up a VLAN tag with 1414 * anything except VLID bits. 1415 */ 1416 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 1417 error = EINVAL; 1418 break; 1419 } 1420 error = vlan_config(ifv, p, vlr.vlr_tag); 1421 if (error) 1422 break; 1423 1424 /* Update flags on the parent, if necessary. */ 1425 vlan_setflags(ifp, 1); 1426 break; 1427 1428 case SIOCGETVLAN: 1429 bzero(&vlr, sizeof(vlr)); 1430 VLAN_LOCK(); 1431 if (TRUNK(ifv) != NULL) { 1432 strlcpy(vlr.vlr_parent, PARENT(ifv)->if_xname, 1433 sizeof(vlr.vlr_parent)); 1434 vlr.vlr_tag = ifv->ifv_tag; 1435 } 1436 VLAN_UNLOCK(); 1437 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 1438 break; 1439 1440 case SIOCSIFFLAGS: 1441 /* 1442 * We should propagate selected flags to the parent, 1443 * e.g., promiscuous mode. 1444 */ 1445 if (TRUNK(ifv) != NULL) 1446 error = vlan_setflags(ifp, 1); 1447 break; 1448 1449 case SIOCADDMULTI: 1450 case SIOCDELMULTI: 1451 /* 1452 * If we don't have a parent, just remember the membership for 1453 * when we do. 1454 */ 1455 if (TRUNK(ifv) != NULL) 1456 error = vlan_setmulti(ifp); 1457 break; 1458 1459 default: 1460 error = EINVAL; 1461 } 1462 1463 return (error); 1464} 1465