if_vlan.c revision 150216
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 150216 2005-09-16 11:44:43Z 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 46#include <sys/param.h> 47#include <sys/kernel.h> 48#include <sys/malloc.h> 49#include <sys/mbuf.h> 50#include <sys/module.h> 51#include <sys/queue.h> 52#include <sys/socket.h> 53#include <sys/sockio.h> 54#include <sys/sysctl.h> 55#include <sys/systm.h> 56 57#include <net/bpf.h> 58#include <net/ethernet.h> 59#include <net/if.h> 60#include <net/if_clone.h> 61#include <net/if_arp.h> 62#include <net/if_dl.h> 63#include <net/if_types.h> 64#include <net/if_vlan_var.h> 65 66#ifdef INET 67#include <netinet/in.h> 68#include <netinet/if_ether.h> 69#endif 70 71#define VLANNAME "vlan" 72 73struct vlan_mc_entry { 74 struct ether_addr mc_addr; 75 SLIST_ENTRY(vlan_mc_entry) mc_entries; 76}; 77 78struct ifvlan { 79 struct ifnet *ifv_ifp; 80 struct ifnet *ifv_p; /* parent inteface of this vlan */ 81 struct ifv_linkmib { 82 int ifvm_parent; 83 int ifvm_encaplen; /* encapsulation length */ 84 int ifvm_mtufudge; /* MTU fudged by this much */ 85 int ifvm_mintu; /* min transmission unit */ 86 u_int16_t ifvm_proto; /* encapsulation ethertype */ 87 u_int16_t ifvm_tag; /* tag to apply on packets leaving if */ 88 } ifv_mib; 89 SLIST_HEAD(__vlan_mchead, vlan_mc_entry) vlan_mc_listhead; 90 LIST_ENTRY(ifvlan) ifv_list; 91 int ifv_flags; 92}; 93#define ifv_tag ifv_mib.ifvm_tag 94#define ifv_encaplen ifv_mib.ifvm_encaplen 95#define ifv_mtufudge ifv_mib.ifvm_mtufudge 96#define ifv_mintu ifv_mib.ifvm_mintu 97 98#define IFVF_PROMISC 0x01 /* promiscuous mode enabled */ 99 100SYSCTL_DECL(_net_link); 101SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 102SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 103 104static MALLOC_DEFINE(M_VLAN, VLANNAME, "802.1Q Virtual LAN Interface"); 105static LIST_HEAD(, ifvlan) ifv_list; 106 107/* 108 * Locking: one lock is used to guard both the ifv_list and modification 109 * to vlan data structures. We are rather conservative here; probably 110 * more than necessary. 111 */ 112static struct mtx ifv_mtx; 113#define VLAN_LOCK_INIT() mtx_init(&ifv_mtx, VLANNAME, NULL, MTX_DEF) 114#define VLAN_LOCK_DESTROY() mtx_destroy(&ifv_mtx) 115#define VLAN_LOCK_ASSERT() mtx_assert(&ifv_mtx, MA_OWNED) 116#define VLAN_LOCK() mtx_lock(&ifv_mtx) 117#define VLAN_UNLOCK() mtx_unlock(&ifv_mtx) 118 119static void vlan_start(struct ifnet *ifp); 120static void vlan_ifinit(void *foo); 121static void vlan_input(struct ifnet *ifp, struct mbuf *m); 122static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 123static int vlan_setmulti(struct ifnet *ifp); 124static int vlan_unconfig(struct ifnet *ifp); 125static int vlan_config(struct ifvlan *ifv, struct ifnet *p); 126static void vlan_link_state(struct ifnet *ifp, int link); 127static int vlan_set_promisc(struct ifnet *ifp); 128 129static struct ifnet *vlan_clone_match_ethertag(struct if_clone *, 130 const char *, int *); 131static int vlan_clone_match(struct if_clone *, const char *); 132static int vlan_clone_create(struct if_clone *, char *, size_t); 133static int vlan_clone_destroy(struct if_clone *, struct ifnet *); 134 135static struct if_clone vlan_cloner = IFC_CLONE_INITIALIZER(VLANNAME, NULL, 136 IF_MAXUNIT, NULL, vlan_clone_match, vlan_clone_create, vlan_clone_destroy); 137 138/* 139 * Program our multicast filter. What we're actually doing is 140 * programming the multicast filter of the parent. This has the 141 * side effect of causing the parent interface to receive multicast 142 * traffic that it doesn't really want, which ends up being discarded 143 * later by the upper protocol layers. Unfortunately, there's no way 144 * to avoid this: there really is only one physical interface. 145 * 146 * XXX: There is a possible race here if more than one thread is 147 * modifying the multicast state of the vlan interface at the same time. 148 */ 149static int 150vlan_setmulti(struct ifnet *ifp) 151{ 152 struct ifnet *ifp_p; 153 struct ifmultiaddr *ifma, *rifma = NULL; 154 struct ifvlan *sc; 155 struct vlan_mc_entry *mc = NULL; 156 struct sockaddr_dl sdl; 157 int error; 158 159 /*VLAN_LOCK_ASSERT();*/ 160 161 /* Find the parent. */ 162 sc = ifp->if_softc; 163 ifp_p = sc->ifv_p; 164 165 /* 166 * If we don't have a parent, just remember the membership for 167 * when we do. 168 */ 169 if (ifp_p == NULL) 170 return (0); 171 172 bzero((char *)&sdl, sizeof(sdl)); 173 sdl.sdl_len = sizeof(sdl); 174 sdl.sdl_family = AF_LINK; 175 sdl.sdl_index = ifp_p->if_index; 176 sdl.sdl_type = IFT_ETHER; 177 sdl.sdl_alen = ETHER_ADDR_LEN; 178 179 /* First, remove any existing filter entries. */ 180 while (SLIST_FIRST(&sc->vlan_mc_listhead) != NULL) { 181 mc = SLIST_FIRST(&sc->vlan_mc_listhead); 182 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 183 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 184 if (error) 185 return (error); 186 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 187 free(mc, M_VLAN); 188 } 189 190 /* Now program new ones. */ 191 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 192 if (ifma->ifma_addr->sa_family != AF_LINK) 193 continue; 194 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_NOWAIT); 195 if (mc == NULL) 196 return (ENOMEM); 197 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 198 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 199 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 200 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 201 LLADDR(&sdl), ETHER_ADDR_LEN); 202 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 203 if (error) 204 return (error); 205 } 206 207 return (0); 208} 209 210/* 211 * VLAN support can be loaded as a module. The only place in the 212 * system that's intimately aware of this is ether_input. We hook 213 * into this code through vlan_input_p which is defined there and 214 * set here. Noone else in the system should be aware of this so 215 * we use an explicit reference here. 216 * 217 * NB: Noone should ever need to check if vlan_input_p is null or 218 * not. This is because interfaces have a count of the number 219 * of active vlans (if_nvlans) and this should never be bumped 220 * except by vlan_config--which is in this module so therefore 221 * the module must be loaded and vlan_input_p must be non-NULL. 222 */ 223extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 224 225/* For if_link_state_change() eyes only... */ 226extern void (*vlan_link_state_p)(struct ifnet *, int); 227 228static int 229vlan_modevent(module_t mod, int type, void *data) 230{ 231 232 switch (type) { 233 case MOD_LOAD: 234 LIST_INIT(&ifv_list); 235 VLAN_LOCK_INIT(); 236 vlan_input_p = vlan_input; 237 vlan_link_state_p = vlan_link_state; 238 if_clone_attach(&vlan_cloner); 239 break; 240 case MOD_UNLOAD: 241 if_clone_detach(&vlan_cloner); 242 vlan_input_p = NULL; 243 vlan_link_state_p = NULL; 244 while (!LIST_EMPTY(&ifv_list)) 245 vlan_clone_destroy(&vlan_cloner, 246 LIST_FIRST(&ifv_list)->ifv_ifp); 247 VLAN_LOCK_DESTROY(); 248 break; 249 default: 250 return (EOPNOTSUPP); 251 } 252 return (0); 253} 254 255static moduledata_t vlan_mod = { 256 "if_vlan", 257 vlan_modevent, 258 0 259}; 260 261DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 262MODULE_DEPEND(if_vlan, miibus, 1, 1, 1); 263 264static struct ifnet * 265vlan_clone_match_ethertag(struct if_clone *ifc, const char *name, int *tag) 266{ 267 const char *cp; 268 struct ifnet *ifp; 269 int t = 0; 270 271 /* Check for <etherif>.<vlan> style interface names. */ 272 IFNET_RLOCK(); 273 TAILQ_FOREACH(ifp, &ifnet, if_link) { 274 if (ifp->if_type != IFT_ETHER) 275 continue; 276 if (strncmp(ifp->if_xname, name, strlen(ifp->if_xname)) != 0) 277 continue; 278 cp = name + strlen(ifp->if_xname); 279 if (*cp != '.') 280 continue; 281 for(; *cp != '\0'; cp++) { 282 if (*cp < '0' || *cp > '9') 283 continue; 284 t = (t * 10) + (*cp - '0'); 285 } 286 if (tag != NULL) 287 *tag = t; 288 break; 289 } 290 IFNET_RUNLOCK(); 291 292 return (ifp); 293} 294 295static int 296vlan_clone_match(struct if_clone *ifc, const char *name) 297{ 298 const char *cp; 299 300 if (vlan_clone_match_ethertag(ifc, name, NULL) != NULL) 301 return (1); 302 303 if (strncmp(VLANNAME, name, strlen(VLANNAME)) != 0) 304 return (0); 305 for (cp = name + 4; *cp != '\0'; cp++) { 306 if (*cp < '0' || *cp > '9') 307 return (0); 308 } 309 310 return (1); 311} 312 313static int 314vlan_clone_create(struct if_clone *ifc, char *name, size_t len) 315{ 316 char *dp; 317 int wildcard; 318 int unit; 319 int error; 320 int tag; 321 int ethertag; 322 struct ifvlan *ifv; 323 struct ifnet *ifp; 324 struct ifnet *p; 325 u_char eaddr[6] = {0,0,0,0,0,0}; 326 327 if ((p = vlan_clone_match_ethertag(ifc, name, &tag)) != NULL) { 328 ethertag = 1; 329 unit = -1; 330 wildcard = 0; 331 332 /* 333 * Don't let the caller set up a VLAN tag with 334 * anything except VLID bits. 335 */ 336 if (tag & ~EVL_VLID_MASK) 337 return (EINVAL); 338 } else { 339 ethertag = 0; 340 341 error = ifc_name2unit(name, &unit); 342 if (error != 0) 343 return (error); 344 345 wildcard = (unit < 0); 346 } 347 348 error = ifc_alloc_unit(ifc, &unit); 349 if (error != 0) 350 return (error); 351 352 /* In the wildcard case, we need to update the name. */ 353 if (wildcard) { 354 for (dp = name; *dp != '\0'; dp++); 355 if (snprintf(dp, len - (dp-name), "%d", unit) > 356 len - (dp-name) - 1) { 357 panic("%s: interface name too long", __func__); 358 } 359 } 360 361 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 362 ifp = ifv->ifv_ifp = if_alloc(IFT_ETHER); 363 if (ifp == NULL) { 364 ifc_free_unit(ifc, unit); 365 free(ifv, M_VLAN); 366 return (ENOSPC); 367 } 368 SLIST_INIT(&ifv->vlan_mc_listhead); 369 370 ifp->if_softc = ifv; 371 /* 372 * Set the name manually rather than using if_initname because 373 * we don't conform to the default naming convention for interfaces. 374 */ 375 strlcpy(ifp->if_xname, name, IFNAMSIZ); 376 ifp->if_dname = ifc->ifc_name; 377 ifp->if_dunit = unit; 378 /* NB: flags are not set here */ 379 ifp->if_linkmib = &ifv->ifv_mib; 380 ifp->if_linkmiblen = sizeof(ifv->ifv_mib); 381 /* NB: mtu is not set here */ 382 383 ifp->if_init = vlan_ifinit; 384 ifp->if_start = vlan_start; 385 ifp->if_ioctl = vlan_ioctl; 386 ifp->if_snd.ifq_maxlen = ifqmaxlen; 387 ether_ifattach(ifp, eaddr); 388 /* Now undo some of the damage... */ 389 ifp->if_baudrate = 0; 390 ifp->if_type = IFT_L2VLAN; 391 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 392 393 VLAN_LOCK(); 394 LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list); 395 VLAN_UNLOCK(); 396 397 if (ethertag) { 398 VLAN_LOCK(); 399 error = vlan_config(ifv, p); 400 if (error != 0) { 401 /* 402 * Since we've partialy failed, we need to back 403 * out all the way, otherwise userland could get 404 * confused. Thus, we destroy the interface. 405 */ 406 LIST_REMOVE(ifv, ifv_list); 407 vlan_unconfig(ifp); 408 VLAN_UNLOCK(); 409 ether_ifdetach(ifp); 410 if_free_type(ifp, IFT_ETHER); 411 free(ifv, M_VLAN); 412 413 return (error); 414 } 415 ifv->ifv_tag = tag; 416 ifp->if_drv_flags |= IFF_DRV_RUNNING; 417 VLAN_UNLOCK(); 418 419 /* Update promiscuous mode, if necessary. */ 420 vlan_set_promisc(ifp); 421 } 422 423 return (0); 424} 425 426static int 427vlan_clone_destroy(struct if_clone *ifc, struct ifnet *ifp) 428{ 429 int unit; 430 struct ifvlan *ifv = ifp->if_softc; 431 432 unit = ifp->if_dunit; 433 434 VLAN_LOCK(); 435 LIST_REMOVE(ifv, ifv_list); 436 vlan_unconfig(ifp); 437 VLAN_UNLOCK(); 438 439 ether_ifdetach(ifp); 440 if_free_type(ifp, IFT_ETHER); 441 442 free(ifv, M_VLAN); 443 444 ifc_free_unit(ifc, unit); 445 446 return (0); 447} 448 449/* 450 * The ifp->if_init entry point for vlan(4) is a no-op. 451 */ 452static void 453vlan_ifinit(void *foo) 454{ 455 456} 457 458static void 459vlan_start(struct ifnet *ifp) 460{ 461 struct ifvlan *ifv; 462 struct ifnet *p; 463 struct ether_vlan_header *evl; 464 struct mbuf *m; 465 int error; 466 467 ifv = ifp->if_softc; 468 p = ifv->ifv_p; 469 470 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 471 for (;;) { 472 IF_DEQUEUE(&ifp->if_snd, m); 473 if (m == 0) 474 break; 475 BPF_MTAP(ifp, m); 476 477 /* 478 * Do not run parent's if_start() if the parent is not up, 479 * or parent's driver will cause a system crash. 480 */ 481 if (!((p->if_flags & IFF_UP) && 482 (p->if_drv_flags & IFF_DRV_RUNNING))) { 483 m_freem(m); 484 ifp->if_collisions++; 485 continue; 486 } 487 488 /* 489 * If underlying interface can do VLAN tag insertion itself, 490 * just pass the packet along. However, we need some way to 491 * tell the interface where the packet came from so that it 492 * knows how to find the VLAN tag to use, so we attach a 493 * packet tag that holds it. 494 */ 495 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) { 496 struct m_tag *mtag = m_tag_alloc(MTAG_VLAN, 497 MTAG_VLAN_TAG, 498 sizeof(u_int), 499 M_NOWAIT); 500 if (mtag == NULL) { 501 ifp->if_oerrors++; 502 m_freem(m); 503 continue; 504 } 505 VLAN_TAG_VALUE(mtag) = ifv->ifv_tag; 506 m_tag_prepend(m, mtag); 507 m->m_flags |= M_VLANTAG; 508 } else { 509 M_PREPEND(m, ifv->ifv_encaplen, M_DONTWAIT); 510 if (m == NULL) { 511 if_printf(ifp, 512 "unable to prepend VLAN header\n"); 513 ifp->if_oerrors++; 514 continue; 515 } 516 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */ 517 518 if (m->m_len < sizeof(*evl)) { 519 m = m_pullup(m, sizeof(*evl)); 520 if (m == NULL) { 521 if_printf(ifp, 522 "cannot pullup VLAN header\n"); 523 ifp->if_oerrors++; 524 continue; 525 } 526 } 527 528 /* 529 * Transform the Ethernet header into an Ethernet header 530 * with 802.1Q encapsulation. 531 */ 532 bcopy(mtod(m, char *) + ifv->ifv_encaplen, 533 mtod(m, char *), ETHER_HDR_LEN); 534 evl = mtod(m, struct ether_vlan_header *); 535 evl->evl_proto = evl->evl_encap_proto; 536 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 537 evl->evl_tag = htons(ifv->ifv_tag); 538#ifdef DEBUG 539 printf("vlan_start: %*D\n", (int)sizeof(*evl), 540 (unsigned char *)evl, ":"); 541#endif 542 } 543 544 /* 545 * Send it, precisely as ether_output() would have. 546 * We are already running at splimp. 547 */ 548 IFQ_HANDOFF(p, m, error); 549 if (!error) 550 ifp->if_opackets++; 551 else 552 ifp->if_oerrors++; 553 } 554 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 555} 556 557static void 558vlan_input(struct ifnet *ifp, struct mbuf *m) 559{ 560 struct ether_vlan_header *evl; 561 struct ifvlan *ifv; 562 struct m_tag *mtag; 563 u_int tag; 564 565 if (m->m_flags & M_VLANTAG) { 566 /* 567 * Packet is tagged, m contains a normal 568 * Ethernet frame; the tag is stored out-of-band. 569 */ 570 mtag = m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL); 571 KASSERT(mtag != NULL, 572 ("%s: M_VLANTAG without m_tag", __func__)); 573 tag = EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)); 574 m_tag_delete(m, mtag); 575 m->m_flags &= ~M_VLANTAG; 576 } else { 577 mtag = NULL; 578 switch (ifp->if_type) { 579 case IFT_ETHER: 580 if (m->m_len < sizeof(*evl) && 581 (m = m_pullup(m, sizeof(*evl))) == NULL) { 582 if_printf(ifp, "cannot pullup VLAN header\n"); 583 return; 584 } 585 evl = mtod(m, struct ether_vlan_header *); 586 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN, 587 ("vlan_input: bad encapsulated protocols (%u)", 588 ntohs(evl->evl_encap_proto))); 589 590 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 591 592 /* 593 * Restore the original ethertype. We'll remove 594 * the encapsulation after we've found the vlan 595 * interface corresponding to the tag. 596 */ 597 evl->evl_encap_proto = evl->evl_proto; 598 break; 599 default: 600 tag = (u_int) -1; 601#ifdef DIAGNOSTIC 602 panic("vlan_input: unsupported if type %u", 603 ifp->if_type); 604#endif 605 break; 606 } 607 } 608 609 VLAN_LOCK(); 610 LIST_FOREACH(ifv, &ifv_list, ifv_list) 611 if (ifp == ifv->ifv_p && tag == ifv->ifv_tag) 612 break; 613 614 if (ifv == NULL || (ifv->ifv_ifp->if_flags & IFF_UP) == 0) { 615 VLAN_UNLOCK(); 616 m_freem(m); 617 ifp->if_noproto++; 618#ifdef DEBUG 619 printf("vlan_input: tag %d, no interface\n", tag); 620#endif 621 return; 622 } 623 VLAN_UNLOCK(); /* XXX extend below? */ 624#ifdef DEBUG 625 printf("vlan_input: tag %d, parent %s\n", tag, ifv->ifv_p->if_xname); 626#endif 627 628 if (mtag == NULL) { 629 /* 630 * Packet had an in-line encapsulation header; 631 * remove it. The original header has already 632 * been fixed up above. 633 */ 634 bcopy(mtod(m, caddr_t), 635 mtod(m, caddr_t) + ETHER_VLAN_ENCAP_LEN, 636 ETHER_HDR_LEN); 637 m_adj(m, ETHER_VLAN_ENCAP_LEN); 638 } 639 640 m->m_pkthdr.rcvif = ifv->ifv_ifp; 641 ifv->ifv_ifp->if_ipackets++; 642 643 /* Pass it back through the parent's input routine. */ 644 (*ifp->if_input)(ifv->ifv_ifp, m); 645} 646 647static int 648vlan_config(struct ifvlan *ifv, struct ifnet *p) 649{ 650 struct ifaddr *ifa1, *ifa2; 651 struct sockaddr_dl *sdl1, *sdl2; 652 653 VLAN_LOCK_ASSERT(); 654 655 if (p->if_data.ifi_type != IFT_ETHER) 656 return (EPROTONOSUPPORT); 657 if (ifv->ifv_p) 658 return (EBUSY); 659 660 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 661 ifv->ifv_mintu = ETHERMIN; 662 ifv->ifv_flags = 0; 663 664 /* 665 * The active VLAN counter on the parent is used 666 * at various places to see if there is a vlan(4) 667 * attached to this physical interface. 668 */ 669 p->if_nvlans++; 670 671 /* 672 * If the parent supports the VLAN_MTU capability, 673 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 674 * use it. 675 */ 676 if (p->if_capenable & IFCAP_VLAN_MTU) { 677 /* 678 * No need to fudge the MTU since the parent can 679 * handle extended frames. 680 */ 681 ifv->ifv_mtufudge = 0; 682 } else { 683 /* 684 * Fudge the MTU by the encapsulation size. This 685 * makes us incompatible with strictly compliant 686 * 802.1Q implementations, but allows us to use 687 * the feature with other NetBSD implementations, 688 * which might still be useful. 689 */ 690 ifv->ifv_mtufudge = ifv->ifv_encaplen; 691 } 692 693 ifv->ifv_p = p; 694 ifv->ifv_ifp->if_mtu = p->if_mtu - ifv->ifv_mtufudge; 695 /* 696 * Copy only a selected subset of flags from the parent. 697 * Other flags are none of our business. 698 */ 699 ifv->ifv_ifp->if_flags = (p->if_flags & 700 (IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX | IFF_POINTOPOINT)); 701 ifv->ifv_ifp->if_link_state = p->if_link_state; 702 703#if 0 704 /* 705 * Not ready yet. We need notification from the parent 706 * when hw checksumming flags in its if_capenable change. 707 * Flags set in if_capabilities only are useless. 708 */ 709 /* 710 * If the parent interface can do hardware-assisted 711 * VLAN encapsulation, then propagate its hardware- 712 * assisted checksumming flags. 713 */ 714 if (p->if_capabilities & IFCAP_VLAN_HWTAGGING) 715 ifv->ifv_ifpif_capabilities |= p->if_capabilities & IFCAP_HWCSUM; 716#endif 717 718 /* 719 * Set up our ``Ethernet address'' to reflect the underlying 720 * physical interface's. 721 */ 722 ifa1 = ifaddr_byindex(ifv->ifv_ifp->if_index); 723 ifa2 = ifaddr_byindex(p->if_index); 724 sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr; 725 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr; 726 sdl1->sdl_type = IFT_ETHER; 727 sdl1->sdl_alen = ETHER_ADDR_LEN; 728 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN); 729 bcopy(LLADDR(sdl2), IFP2ENADDR(ifv->ifv_ifp), ETHER_ADDR_LEN); 730 731 /* 732 * Configure multicast addresses that may already be 733 * joined on the vlan device. 734 */ 735 (void)vlan_setmulti(ifv->ifv_ifp); /* XXX: VLAN lock held */ 736 737 return (0); 738} 739 740static int 741vlan_unconfig(struct ifnet *ifp) 742{ 743 struct ifaddr *ifa; 744 struct sockaddr_dl *sdl; 745 struct vlan_mc_entry *mc; 746 struct ifvlan *ifv; 747 struct ifnet *p; 748 int error; 749 750 VLAN_LOCK_ASSERT(); 751 752 ifv = ifp->if_softc; 753 p = ifv->ifv_p; 754 755 if (p) { 756 struct sockaddr_dl sdl; 757 758 /* 759 * Since the interface is being unconfigured, we need to 760 * empty the list of multicast groups that we may have joined 761 * while we were alive from the parent's list. 762 */ 763 bzero((char *)&sdl, sizeof(sdl)); 764 sdl.sdl_len = sizeof(sdl); 765 sdl.sdl_family = AF_LINK; 766 sdl.sdl_index = p->if_index; 767 sdl.sdl_type = IFT_ETHER; 768 sdl.sdl_alen = ETHER_ADDR_LEN; 769 770 while(SLIST_FIRST(&ifv->vlan_mc_listhead) != NULL) { 771 mc = SLIST_FIRST(&ifv->vlan_mc_listhead); 772 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), 773 ETHER_ADDR_LEN); 774 error = if_delmulti(p, (struct sockaddr *)&sdl); 775 if (error) 776 return (error); 777 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 778 free(mc, M_VLAN); 779 } 780 781 p->if_nvlans--; 782 } 783 784 /* Disconnect from parent. */ 785 ifv->ifv_p = NULL; 786 ifv->ifv_ifp->if_mtu = ETHERMTU; /* XXX why not 0? */ 787 ifv->ifv_flags = 0; 788 ifv->ifv_ifp->if_link_state = LINK_STATE_UNKNOWN; 789 790 /* Clear our MAC address. */ 791 ifa = ifaddr_byindex(ifv->ifv_ifp->if_index); 792 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 793 sdl->sdl_type = IFT_ETHER; 794 sdl->sdl_alen = ETHER_ADDR_LEN; 795 bzero(LLADDR(sdl), ETHER_ADDR_LEN); 796 bzero(IFP2ENADDR(ifv->ifv_ifp), ETHER_ADDR_LEN); 797 798 return (0); 799} 800 801static int 802vlan_set_promisc(struct ifnet *ifp) 803{ 804 struct ifvlan *ifv = ifp->if_softc; 805 int error = 0; 806 807 if ((ifp->if_flags & IFF_PROMISC) != 0) { 808 if ((ifv->ifv_flags & IFVF_PROMISC) == 0) { 809 error = ifpromisc(ifv->ifv_p, 1); 810 if (error == 0) 811 ifv->ifv_flags |= IFVF_PROMISC; 812 } 813 } else { 814 if ((ifv->ifv_flags & IFVF_PROMISC) != 0) { 815 error = ifpromisc(ifv->ifv_p, 0); 816 if (error == 0) 817 ifv->ifv_flags &= ~IFVF_PROMISC; 818 } 819 } 820 821 return (error); 822} 823 824/* Inform all vlans that their parent has changed link state */ 825static void 826vlan_link_state(struct ifnet *ifp, int link) 827{ 828 struct ifvlan *ifv; 829 830 VLAN_LOCK(); 831 LIST_FOREACH(ifv, &ifv_list, ifv_list) { 832 if (ifv->ifv_p == ifp) 833 if_link_state_change(ifv->ifv_ifp, 834 ifv->ifv_p->if_link_state); 835 } 836 VLAN_UNLOCK(); 837} 838 839static int 840vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 841{ 842 struct ifaddr *ifa; 843 struct ifnet *p; 844 struct ifreq *ifr; 845 struct ifvlan *ifv; 846 struct vlanreq vlr; 847 int error = 0; 848 849 ifr = (struct ifreq *)data; 850 ifa = (struct ifaddr *)data; 851 ifv = ifp->if_softc; 852 853 switch (cmd) { 854 case SIOCSIFADDR: 855 ifp->if_flags |= IFF_UP; 856 857 switch (ifa->ifa_addr->sa_family) { 858#ifdef INET 859 case AF_INET: 860 arp_ifinit(ifv->ifv_ifp, ifa); 861 break; 862#endif 863 default: 864 break; 865 } 866 break; 867 868 case SIOCGIFADDR: 869 { 870 struct sockaddr *sa; 871 872 sa = (struct sockaddr *) &ifr->ifr_data; 873 bcopy(IFP2ENADDR(ifp), (caddr_t)sa->sa_data, 874 ETHER_ADDR_LEN); 875 } 876 break; 877 878 case SIOCGIFMEDIA: 879 VLAN_LOCK(); 880 if (ifv->ifv_p != NULL) { 881 error = (*ifv->ifv_p->if_ioctl)(ifv->ifv_p, 882 SIOCGIFMEDIA, data); 883 VLAN_UNLOCK(); 884 /* Limit the result to the parent's current config. */ 885 if (error == 0) { 886 struct ifmediareq *ifmr; 887 888 ifmr = (struct ifmediareq *)data; 889 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 890 ifmr->ifm_count = 1; 891 error = copyout(&ifmr->ifm_current, 892 ifmr->ifm_ulist, 893 sizeof(int)); 894 } 895 } 896 } else { 897 VLAN_UNLOCK(); 898 error = EINVAL; 899 } 900 break; 901 902 case SIOCSIFMEDIA: 903 error = EINVAL; 904 break; 905 906 case SIOCSIFMTU: 907 /* 908 * Set the interface MTU. 909 */ 910 VLAN_LOCK(); 911 if (ifv->ifv_p != NULL) { 912 if (ifr->ifr_mtu > 913 (ifv->ifv_p->if_mtu - ifv->ifv_mtufudge) || 914 ifr->ifr_mtu < 915 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 916 error = EINVAL; 917 else 918 ifp->if_mtu = ifr->ifr_mtu; 919 } else 920 error = EINVAL; 921 VLAN_UNLOCK(); 922 break; 923 924 case SIOCSETVLAN: 925 error = copyin(ifr->ifr_data, &vlr, sizeof(vlr)); 926 if (error) 927 break; 928 if (vlr.vlr_parent[0] == '\0') { 929 VLAN_LOCK(); 930 vlan_unconfig(ifp); 931 if (ifp->if_flags & IFF_UP) 932 if_down(ifp); 933 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 934 VLAN_UNLOCK(); 935 break; 936 } 937 p = ifunit(vlr.vlr_parent); 938 if (p == 0) { 939 error = ENOENT; 940 break; 941 } 942 /* 943 * Don't let the caller set up a VLAN tag with 944 * anything except VLID bits. 945 */ 946 if (vlr.vlr_tag & ~EVL_VLID_MASK) { 947 error = EINVAL; 948 break; 949 } 950 VLAN_LOCK(); 951 error = vlan_config(ifv, p); 952 if (error) { 953 VLAN_UNLOCK(); 954 break; 955 } 956 ifv->ifv_tag = vlr.vlr_tag; 957 ifp->if_drv_flags |= IFF_DRV_RUNNING; 958 VLAN_UNLOCK(); 959 960 /* Update promiscuous mode, if necessary. */ 961 vlan_set_promisc(ifp); 962 break; 963 964 case SIOCGETVLAN: 965 bzero(&vlr, sizeof(vlr)); 966 VLAN_LOCK(); 967 if (ifv->ifv_p) { 968 strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname, 969 sizeof(vlr.vlr_parent)); 970 vlr.vlr_tag = ifv->ifv_tag; 971 } 972 VLAN_UNLOCK(); 973 error = copyout(&vlr, ifr->ifr_data, sizeof(vlr)); 974 break; 975 976 case SIOCSIFFLAGS: 977 /* 978 * For promiscuous mode, we enable promiscuous mode on 979 * the parent if we need promiscuous on the VLAN interface. 980 */ 981 if (ifv->ifv_p != NULL) 982 error = vlan_set_promisc(ifp); 983 break; 984 985 case SIOCADDMULTI: 986 case SIOCDELMULTI: 987 /*VLAN_LOCK();*/ 988 error = vlan_setmulti(ifp); 989 /*VLAN_UNLOCK();*/ 990 break; 991 default: 992 error = EINVAL; 993 } 994 995 return (error); 996} 997