Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if_vlan.c
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1 /* 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: releng/5.0/sys/net/if_vlan.c 106932 2002-11-14 23:43:16Z sam $ 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_arp.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/if_vlan_var.h> 64 65 #ifdef INET 66 #include <netinet/in.h> 67 #include <netinet/if_ether.h> 68 #endif 69 70 #define VLANNAME "vlan" 71 72 struct vlan_mc_entry { 73 struct ether_addr mc_addr; 74 SLIST_ENTRY(vlan_mc_entry) mc_entries; 75 }; 76 77 struct ifvlan { 78 struct arpcom ifv_ac; /* make this an interface */ 79 struct ifnet *ifv_p; /* parent inteface of this vlan */ 80 struct ifv_linkmib { 81 int ifvm_parent; 82 int ifvm_encaplen; /* encapsulation length */ 83 int ifvm_mtufudge; /* MTU fudged by this much */ 84 int ifvm_mintu; /* min transmission unit */ 85 u_int16_t ifvm_proto; /* encapsulation ethertype */ 86 u_int16_t ifvm_tag; /* tag to apply on packets leaving if */ 87 } ifv_mib; 88 SLIST_HEAD(__vlan_mchead, vlan_mc_entry) vlan_mc_listhead; 89 LIST_ENTRY(ifvlan) ifv_list; 90 int ifv_flags; 91 }; 92 #define ifv_if ifv_ac.ac_if 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 */ 99 100 SYSCTL_DECL(_net_link); 101 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 102 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 103 104 static MALLOC_DEFINE(M_VLAN, "vlan", "802.1Q Virtual LAN Interface"); 105 static LIST_HEAD(, ifvlan) ifv_list; 106 107 static int vlan_clone_create(struct if_clone *, int); 108 static void vlan_clone_destroy(struct ifnet *); 109 static void vlan_start(struct ifnet *ifp); 110 static void vlan_ifinit(void *foo); 111 static void vlan_input(struct ifnet *ifp, struct mbuf *m); 112 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 113 static int vlan_setmulti(struct ifnet *ifp); 114 static int vlan_unconfig(struct ifnet *ifp); 115 static int vlan_config(struct ifvlan *ifv, struct ifnet *p); 116 117 struct if_clone vlan_cloner = IF_CLONE_INITIALIZER("vlan", 118 vlan_clone_create, vlan_clone_destroy, 0, IF_MAXUNIT); 119 120 /* 121 * Program our multicast filter. What we're actually doing is 122 * programming the multicast filter of the parent. This has the 123 * side effect of causing the parent interface to receive multicast 124 * traffic that it doesn't really want, which ends up being discarded 125 * later by the upper protocol layers. Unfortunately, there's no way 126 * to avoid this: there really is only one physical interface. 127 */ 128 static int 129 vlan_setmulti(struct ifnet *ifp) 130 { 131 struct ifnet *ifp_p; 132 struct ifmultiaddr *ifma, *rifma = NULL; 133 struct ifvlan *sc; 134 struct vlan_mc_entry *mc = NULL; 135 struct sockaddr_dl sdl; 136 int error; 137 138 /* Find the parent. */ 139 sc = ifp->if_softc; 140 ifp_p = sc->ifv_p; 141 142 /* 143 * If we don't have a parent, just remember the membership for 144 * when we do. 145 */ 146 if (ifp_p == NULL) 147 return(0); 148 149 bzero((char *)&sdl, sizeof sdl); 150 sdl.sdl_len = sizeof sdl; 151 sdl.sdl_family = AF_LINK; 152 sdl.sdl_index = ifp_p->if_index; 153 sdl.sdl_type = IFT_ETHER; 154 sdl.sdl_alen = ETHER_ADDR_LEN; 155 156 /* First, remove any existing filter entries. */ 157 while(SLIST_FIRST(&sc->vlan_mc_listhead) != NULL) { 158 mc = SLIST_FIRST(&sc->vlan_mc_listhead); 159 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 160 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 161 if (error) 162 return(error); 163 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 164 free(mc, M_VLAN); 165 } 166 167 /* Now program new ones. */ 168 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 169 if (ifma->ifma_addr->sa_family != AF_LINK) 170 continue; 171 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_WAITOK); 172 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 173 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 174 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 175 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 176 LLADDR(&sdl), ETHER_ADDR_LEN); 177 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 178 if (error) 179 return(error); 180 } 181 182 return(0); 183 } 184 185 /* 186 * VLAN support can be loaded as a module. The only place in the 187 * system that's intimately aware of this is ether_input. We hook 188 * into this code through vlan_input_p which is defined there and 189 * set here. Noone else in the system should be aware of this so 190 * we use an explicit reference here. 191 * 192 * NB: Noone should ever need to check if vlan_input_p is null or 193 * not. This is because interfaces have a count of the number 194 * of active vlans (if_nvlans) and this should never be bumped 195 * except by vlan_config--which is in this module so therefore 196 * the module must be loaded and vlan_input_p must be non-NULL. 197 */ 198 extern void (*vlan_input_p)(struct ifnet *, struct mbuf *); 199 200 static int 201 vlan_modevent(module_t mod, int type, void *data) 202 { 203 204 switch (type) { 205 case MOD_LOAD: 206 LIST_INIT(&ifv_list); 207 vlan_input_p = vlan_input; 208 if_clone_attach(&vlan_cloner); 209 break; 210 case MOD_UNLOAD: 211 if_clone_detach(&vlan_cloner); 212 vlan_input_p = NULL; 213 while (!LIST_EMPTY(&ifv_list)) 214 vlan_clone_destroy(&LIST_FIRST(&ifv_list)->ifv_if); 215 break; 216 } 217 return 0; 218 } 219 220 static moduledata_t vlan_mod = { 221 "if_vlan", 222 vlan_modevent, 223 0 224 }; 225 226 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 227 228 static int 229 vlan_clone_create(struct if_clone *ifc, int unit) 230 { 231 struct ifvlan *ifv; 232 struct ifnet *ifp; 233 int s; 234 235 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO); 236 ifp = &ifv->ifv_if; 237 SLIST_INIT(&ifv->vlan_mc_listhead); 238 239 s = splnet(); 240 LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list); 241 splx(s); 242 243 ifp->if_softc = ifv; 244 ifp->if_name = "vlan"; 245 ifp->if_unit = unit; 246 /* NB: flags are not set here */ 247 ifp->if_linkmib = &ifv->ifv_mib; 248 ifp->if_linkmiblen = sizeof ifv->ifv_mib; 249 /* NB: mtu is not set here */ 250 251 ifp->if_init = vlan_ifinit; 252 ifp->if_start = vlan_start; 253 ifp->if_ioctl = vlan_ioctl; 254 ifp->if_snd.ifq_maxlen = ifqmaxlen; 255 ether_ifattach(ifp, ifv->ifv_ac.ac_enaddr); 256 /* Now undo some of the damage... */ 257 ifp->if_baudrate = 0; 258 ifp->if_type = IFT_L2VLAN; 259 ifp->if_hdrlen = ETHER_VLAN_ENCAP_LEN; 260 261 return (0); 262 } 263 264 static void 265 vlan_clone_destroy(struct ifnet *ifp) 266 { 267 struct ifvlan *ifv = ifp->if_softc; 268 int s; 269 270 s = splnet(); 271 LIST_REMOVE(ifv, ifv_list); 272 vlan_unconfig(ifp); 273 splx(s); 274 275 ether_ifdetach(ifp); 276 277 free(ifv, M_VLAN); 278 } 279 280 static void 281 vlan_ifinit(void *foo) 282 { 283 return; 284 } 285 286 static void 287 vlan_start(struct ifnet *ifp) 288 { 289 struct ifvlan *ifv; 290 struct ifnet *p; 291 struct ether_vlan_header *evl; 292 struct mbuf *m; 293 294 ifv = ifp->if_softc; 295 p = ifv->ifv_p; 296 297 ifp->if_flags |= IFF_OACTIVE; 298 for (;;) { 299 IF_DEQUEUE(&ifp->if_snd, m); 300 if (m == 0) 301 break; 302 BPF_MTAP(ifp, m); 303 304 /* 305 * Do not run parent's if_start() if the parent is not up, 306 * or parent's driver will cause a system crash. 307 */ 308 if ((p->if_flags & (IFF_UP | IFF_RUNNING)) != 309 (IFF_UP | IFF_RUNNING)) { 310 m_freem(m); 311 ifp->if_collisions++; 312 continue; 313 } 314 315 /* 316 * If underlying interface can do VLAN tag insertion itself, 317 * just pass the packet along. However, we need some way to 318 * tell the interface where the packet came from so that it 319 * knows how to find the VLAN tag to use, so we attach a 320 * packet tag that holds it. 321 */ 322 if (ifp->if_capabilities & IFCAP_VLAN_HWTAGGING) { 323 struct m_tag *mtag = m_tag_alloc(MTAG_VLAN, 324 MTAG_VLAN_TAG, 325 sizeof (u_int), 326 M_DONTWAIT); 327 if (mtag == NULL) { 328 ifp->if_oerrors++; 329 m_freem(m); 330 continue; 331 } 332 *(u_int*)(mtag+1) = ifv->ifv_tag; 333 m_tag_prepend(m, mtag); 334 } else { 335 M_PREPEND(m, ifv->ifv_encaplen, M_DONTWAIT); 336 if (m == NULL) { 337 if_printf(ifp, "unable to prepend VLAN header"); 338 ifp->if_ierrors++; 339 continue; 340 } 341 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */ 342 343 if (m->m_len < sizeof(*evl)) { 344 m = m_pullup(m, sizeof(*evl)); 345 if (m == NULL) { 346 if_printf(ifp, 347 "cannot pullup VLAN header"); 348 ifp->if_ierrors++; 349 continue; 350 } 351 } 352 353 /* 354 * Transform the Ethernet header into an Ethernet header 355 * with 802.1Q encapsulation. 356 */ 357 bcopy(mtod(m, char *) + ifv->ifv_encaplen, 358 mtod(m, char *), sizeof(struct ether_header)); 359 evl = mtod(m, struct ether_vlan_header *); 360 evl->evl_proto = evl->evl_encap_proto; 361 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 362 evl->evl_tag = htons(ifv->ifv_tag); 363 #ifdef DEBUG 364 printf("vlan_start: %*D\n", (int)sizeof *evl, 365 (unsigned char *)evl, ":"); 366 #endif 367 } 368 369 /* 370 * Send it, precisely as ether_output() would have. 371 * We are already running at splimp. 372 */ 373 if (IF_HANDOFF(&p->if_snd, m, p)) 374 ifp->if_opackets++; 375 else 376 ifp->if_oerrors++; 377 } 378 ifp->if_flags &= ~IFF_OACTIVE; 379 380 return; 381 } 382 383 static void 384 vlan_input(struct ifnet *ifp, struct mbuf *m) 385 { 386 struct ether_vlan_header *evl; 387 struct ifvlan *ifv; 388 struct m_tag *mtag; 389 u_int tag; 390 391 mtag = m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL); 392 if (mtag != NULL) { 393 /* 394 * Packet is tagged, m contains a normal 395 * Ethernet frame; the tag is stored out-of-band. 396 */ 397 tag = *(u_int*)(mtag+1); 398 m_tag_delete(m, mtag); 399 } else { 400 switch (ifp->if_type) { 401 case IFT_ETHER: 402 if (m->m_len < sizeof (*evl) && 403 (m = m_pullup(m, sizeof (*evl))) == NULL) { 404 if_printf(ifp, "cannot pullup VLAN header\n"); 405 return; 406 } 407 evl = mtod(m, struct ether_vlan_header *); 408 KASSERT(ntohs(evl->evl_encap_proto) == ETHERTYPE_VLAN, 409 ("vlan_input: bad encapsulated protocols (%u)", 410 ntohs(evl->evl_encap_proto))); 411 412 tag = EVL_VLANOFTAG(ntohs(evl->evl_tag)); 413 414 /* 415 * Restore the original ethertype. We'll remove 416 * the encapsulation after we've found the vlan 417 * interface corresponding to the tag. 418 */ 419 evl->evl_encap_proto = evl->evl_proto; 420 break; 421 default: 422 tag = (u_int) -1; 423 #ifdef DIAGNOSTIC 424 panic("vlan_input: unsupported if type %u", ifp->if_type); 425 #endif 426 break; 427 } 428 } 429 430 for (ifv = LIST_FIRST(&ifv_list); ifv != NULL; 431 ifv = LIST_NEXT(ifv, ifv_list)) 432 if (ifp == ifv->ifv_p && tag == ifv->ifv_tag) 433 break; 434 435 if (ifv == NULL || (ifv->ifv_if.if_flags & IFF_UP) == 0) { 436 m_freem(m); 437 ifp->if_noproto++; 438 return; 439 } 440 441 if (mtag == NULL) { 442 /* 443 * Packet had an in-line encapsulation header; 444 * remove it. The original header has already 445 * been fixed up above. 446 */ 447 bcopy(mtod(m, caddr_t), 448 mtod(m, caddr_t) + ETHER_VLAN_ENCAP_LEN, 449 sizeof (struct ether_header)); 450 m_adj(m, ETHER_VLAN_ENCAP_LEN); 451 } 452 453 m->m_pkthdr.rcvif = &ifv->ifv_if; 454 ifv->ifv_if.if_ipackets++; 455 456 /* Pass it back through the parent's input routine. */ 457 (*ifp->if_input)(&ifv->ifv_if, m); 458 } 459 460 static int 461 vlan_config(struct ifvlan *ifv, struct ifnet *p) 462 { 463 struct ifaddr *ifa1, *ifa2; 464 struct sockaddr_dl *sdl1, *sdl2; 465 466 if (p->if_data.ifi_type != IFT_ETHER) 467 return EPROTONOSUPPORT; 468 if (ifv->ifv_p) 469 return EBUSY; 470 471 ifv->ifv_encaplen = ETHER_VLAN_ENCAP_LEN; 472 ifv->ifv_mintu = ETHERMIN; 473 ifv->ifv_flags = 0; 474 475 /* 476 * If the parent supports the VLAN_MTU capability, 477 * i.e. can Tx/Rx larger than ETHER_MAX_LEN frames, 478 * enable it. 479 */ 480 p->if_nvlans++; 481 if (p->if_nvlans == 1 && (p->if_capabilities & IFCAP_VLAN_MTU) != 0) { 482 /* 483 * Enable Tx/Rx of VLAN-sized frames. 484 */ 485 p->if_capenable |= IFCAP_VLAN_MTU; 486 if (p->if_flags & IFF_UP) { 487 struct ifreq ifr; 488 int error; 489 490 ifr.ifr_flags = p->if_flags; 491 error = (*p->if_ioctl)(p, SIOCSIFFLAGS, 492 (caddr_t) &ifr); 493 if (error) { 494 p->if_nvlans--; 495 if (p->if_nvlans == 0) 496 p->if_capenable &= ~IFCAP_VLAN_MTU; 497 return (error); 498 } 499 } 500 ifv->ifv_mtufudge = 0; 501 } else if ((p->if_capabilities & IFCAP_VLAN_MTU) == 0) { 502 /* 503 * Fudge the MTU by the encapsulation size. This 504 * makes us incompatible with strictly compliant 505 * 802.1Q implementations, but allows us to use 506 * the feature with other NetBSD implementations, 507 * which might still be useful. 508 */ 509 ifv->ifv_mtufudge = ifv->ifv_encaplen; 510 } 511 512 ifv->ifv_p = p; 513 ifv->ifv_if.if_mtu = p->if_mtu - ifv->ifv_mtufudge; 514 /* 515 * Copy only a selected subset of flags from the parent. 516 * Other flags are none of our business. 517 */ 518 ifv->ifv_if.if_flags = (p->if_flags & 519 (IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX | IFF_POINTOPOINT)); 520 521 /* 522 * If the parent interface can do hardware-assisted 523 * VLAN encapsulation, then propagate its hardware- 524 * assisted checksumming flags. 525 */ 526 if (p->if_capabilities & IFCAP_VLAN_HWTAGGING) 527 ifv->ifv_if.if_capabilities |= p->if_capabilities & IFCAP_HWCSUM; 528 529 /* 530 * Set up our ``Ethernet address'' to reflect the underlying 531 * physical interface's. 532 */ 533 ifa1 = ifaddr_byindex(ifv->ifv_if.if_index); 534 ifa2 = ifaddr_byindex(p->if_index); 535 sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr; 536 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr; 537 sdl1->sdl_type = IFT_ETHER; 538 sdl1->sdl_alen = ETHER_ADDR_LEN; 539 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN); 540 bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 541 542 /* 543 * Configure multicast addresses that may already be 544 * joined on the vlan device. 545 */ 546 (void)vlan_setmulti(&ifv->ifv_if); 547 548 return 0; 549 } 550 551 static int 552 vlan_unconfig(struct ifnet *ifp) 553 { 554 struct ifaddr *ifa; 555 struct sockaddr_dl *sdl; 556 struct vlan_mc_entry *mc; 557 struct ifvlan *ifv; 558 struct ifnet *p; 559 int error; 560 561 ifv = ifp->if_softc; 562 p = ifv->ifv_p; 563 564 if (p) { 565 struct sockaddr_dl sdl; 566 567 /* 568 * Since the interface is being unconfigured, we need to 569 * empty the list of multicast groups that we may have joined 570 * while we were alive from the parent's list. 571 */ 572 bzero((char *)&sdl, sizeof sdl); 573 sdl.sdl_len = sizeof sdl; 574 sdl.sdl_family = AF_LINK; 575 sdl.sdl_index = p->if_index; 576 sdl.sdl_type = IFT_ETHER; 577 sdl.sdl_alen = ETHER_ADDR_LEN; 578 579 while(SLIST_FIRST(&ifv->vlan_mc_listhead) != NULL) { 580 mc = SLIST_FIRST(&ifv->vlan_mc_listhead); 581 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 582 error = if_delmulti(p, (struct sockaddr *)&sdl); 583 if (error) 584 return(error); 585 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 586 free(mc, M_VLAN); 587 } 588 589 p->if_nvlans--; 590 if (p->if_nvlans == 0) { 591 /* 592 * Disable Tx/Rx of VLAN-sized frames. 593 */ 594 p->if_capenable &= ~IFCAP_VLAN_MTU; 595 if (p->if_flags & IFF_UP) { 596 struct ifreq ifr; 597 598 ifr.ifr_flags = p->if_flags; 599 (*p->if_ioctl)(p, SIOCSIFFLAGS, (caddr_t) &ifr); 600 } 601 } 602 } 603 604 /* Disconnect from parent. */ 605 ifv->ifv_p = NULL; 606 ifv->ifv_if.if_mtu = ETHERMTU; /* XXX why not 0? */ 607 ifv->ifv_flags = 0; 608 609 /* Clear our MAC address. */ 610 ifa = ifaddr_byindex(ifv->ifv_if.if_index); 611 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 612 sdl->sdl_type = IFT_ETHER; 613 sdl->sdl_alen = ETHER_ADDR_LEN; 614 bzero(LLADDR(sdl), ETHER_ADDR_LEN); 615 bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 616 617 return 0; 618 } 619 620 static int 621 vlan_set_promisc(struct ifnet *ifp) 622 { 623 struct ifvlan *ifv = ifp->if_softc; 624 int error = 0; 625 626 if ((ifp->if_flags & IFF_PROMISC) != 0) { 627 if ((ifv->ifv_flags & IFVF_PROMISC) == 0) { 628 error = ifpromisc(ifv->ifv_p, 1); 629 if (error == 0) 630 ifv->ifv_flags |= IFVF_PROMISC; 631 } 632 } else { 633 if ((ifv->ifv_flags & IFVF_PROMISC) != 0) { 634 error = ifpromisc(ifv->ifv_p, 0); 635 if (error == 0) 636 ifv->ifv_flags &= ~IFVF_PROMISC; 637 } 638 } 639 640 return (error); 641 } 642 643 static int 644 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 645 { 646 struct ifaddr *ifa; 647 struct ifnet *p; 648 struct ifreq *ifr; 649 struct ifvlan *ifv; 650 struct vlanreq vlr; 651 int error = 0; 652 653 ifr = (struct ifreq *)data; 654 ifa = (struct ifaddr *)data; 655 ifv = ifp->if_softc; 656 657 switch (cmd) { 658 case SIOCSIFADDR: 659 ifp->if_flags |= IFF_UP; 660 661 switch (ifa->ifa_addr->sa_family) { 662 #ifdef INET 663 case AF_INET: 664 arp_ifinit(&ifv->ifv_if, ifa); 665 break; 666 #endif 667 default: 668 break; 669 } 670 break; 671 672 case SIOCGIFADDR: 673 { 674 struct sockaddr *sa; 675 676 sa = (struct sockaddr *) &ifr->ifr_data; 677 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr, 678 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 679 } 680 break; 681 682 case SIOCSIFMTU: 683 /* 684 * Set the interface MTU. 685 */ 686 if (ifv->ifv_p != NULL) { 687 if (ifr->ifr_mtu > 688 (ifv->ifv_p->if_mtu - ifv->ifv_mtufudge) || 689 ifr->ifr_mtu < 690 (ifv->ifv_mintu - ifv->ifv_mtufudge)) 691 error = EINVAL; 692 else 693 ifp->if_mtu = ifr->ifr_mtu; 694 } else 695 error = EINVAL; 696 break; 697 698 case SIOCSETVLAN: 699 error = copyin(ifr->ifr_data, &vlr, sizeof vlr); 700 if (error) 701 break; 702 if (vlr.vlr_parent[0] == '\0') { 703 vlan_unconfig(ifp); 704 if (ifp->if_flags & IFF_UP) { 705 int s = splimp(); 706 if_down(ifp); 707 splx(s); 708 } 709 ifp->if_flags &= ~IFF_RUNNING; 710 break; 711 } 712 p = ifunit(vlr.vlr_parent); 713 if (p == 0) { 714 error = ENOENT; 715 break; 716 } 717 error = vlan_config(ifv, p); 718 if (error) 719 break; 720 ifv->ifv_tag = vlr.vlr_tag; 721 ifp->if_flags |= IFF_RUNNING; 722 723 /* Update promiscuous mode, if necessary. */ 724 vlan_set_promisc(ifp); 725 break; 726 727 case SIOCGETVLAN: 728 bzero(&vlr, sizeof vlr); 729 if (ifv->ifv_p) { 730 snprintf(vlr.vlr_parent, sizeof(vlr.vlr_parent), 731 "%s%d", ifv->ifv_p->if_name, ifv->ifv_p->if_unit); 732 vlr.vlr_tag = ifv->ifv_tag; 733 } 734 error = copyout(&vlr, ifr->ifr_data, sizeof vlr); 735 break; 736 737 case SIOCSIFFLAGS: 738 /* 739 * For promiscuous mode, we enable promiscuous mode on 740 * the parent if we need promiscuous on the VLAN interface. 741 */ 742 if (ifv->ifv_p != NULL) 743 error = vlan_set_promisc(ifp); 744 break; 745 746 case SIOCADDMULTI: 747 case SIOCDELMULTI: 748 error = vlan_setmulti(ifp); 749 break; 750 default: 751 error = EINVAL; 752 } 753 return error; 754 }
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