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: src/sys/net/if_vlan.c,v 1.15.2.13 2003/02/14 22:25:58 fenner Exp $ 30 * $DragonFly: src/sys/net/vlan/if_vlan.c,v 1.6 2004/01/06 01:40:51 dillon Exp $ 31 */ 32 33 /* 34 * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs. 35 * Might be extended some day to also handle IEEE 802.1p priority 36 * tagging. This is sort of sneaky in the implementation, since 37 * we need to pretend to be enough of an Ethernet implementation 38 * to make arp work. The way we do this is by telling everyone 39 * that we are an Ethernet, and then catch the packets that 40 * ether_output() left on our output queue queue when it calls 41 * if_start(), rewrite them for use by the real outgoing interface, 42 * and ask it to send them. 43 * 44 * 45 * XXX It's incorrect to assume that we must always kludge up 46 * headers on the physical device's behalf: some devices support 47 * VLAN tag insertion and extraction in firmware. For these cases, 48 * one can change the behavior of the vlan interface by setting 49 * the LINK0 flag on it (that is setting the vlan interface's LINK0 50 * flag, _not_ the parent's LINK0 flag; we try to leave the parent 51 * alone). If the interface has the LINK0 flag set, then it will 52 * not modify the ethernet header on output, because the parent 53 * can do that for itself. On input, the parent can call vlan_input_tag() 54 * directly in order to supply us with an incoming mbuf and the vlan 55 * tag value that goes with it. 56 */ 57 58 #ifndef NVLAN 59 #include "use_vlan.h" 60 #endif 61 #include "opt_inet.h" 62 63 #include <sys/param.h> 64 #include <sys/kernel.h> 65 #include <sys/malloc.h> 66 #include <sys/mbuf.h> 67 #include <sys/module.h> 68 #include <sys/queue.h> 69 #include <sys/socket.h> 70 #include <sys/sockio.h> 71 #include <sys/sysctl.h> 72 #include <sys/systm.h> 73 #include <machine/bus.h> /* XXX: Shouldn't really be required! */ 74 75 #include <net/bpf.h> 76 #include <net/ethernet.h> 77 #include <net/if.h> 78 #include <net/if_arp.h> 79 #include <net/if_dl.h> 80 #include <net/if_types.h> 81 #include "if_vlan_var.h" 82 83 #ifdef INET 84 #include <netinet/in.h> 85 #include <netinet/if_ether.h> 86 #endif 87 88 #define VLANNAME "vlan" 89 90 SYSCTL_DECL(_net_link); 91 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN"); 92 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency"); 93 94 static MALLOC_DEFINE(M_VLAN, "vlan", "802.1Q Virtual LAN Interface"); 95 static LIST_HEAD(, ifvlan) ifv_list; 96 97 static int vlan_clone_create(struct if_clone *, int); 98 static void vlan_clone_destroy(struct ifnet *); 99 static void vlan_start(struct ifnet *ifp); 100 static void vlan_ifinit(void *foo); 101 static int vlan_input(struct ether_header *eh, struct mbuf *m); 102 static int vlan_input_tag(struct ether_header *eh, struct mbuf *m, 103 u_int16_t t); 104 static int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr); 105 static int vlan_setmulti(struct ifnet *ifp); 106 static int vlan_unconfig(struct ifnet *ifp); 107 static int vlan_config(struct ifvlan *ifv, struct ifnet *p); 108 109 struct if_clone vlan_cloner = IF_CLONE_INITIALIZER("vlan", vlan_clone_create, 110 vlan_clone_destroy, NVLAN, IF_MAXUNIT); 111 112 /* 113 * Program our multicast filter. What we're actually doing is 114 * programming the multicast filter of the parent. This has the 115 * side effect of causing the parent interface to receive multicast 116 * traffic that it doesn't really want, which ends up being discarded 117 * later by the upper protocol layers. Unfortunately, there's no way 118 * to avoid this: there really is only one physical interface. 119 */ 120 static int 121 vlan_setmulti(struct ifnet *ifp) 122 { 123 struct ifnet *ifp_p; 124 struct ifmultiaddr *ifma, *rifma = NULL; 125 struct ifvlan *sc; 126 struct vlan_mc_entry *mc = NULL; 127 struct sockaddr_dl sdl; 128 int error; 129 130 /* Find the parent. */ 131 sc = ifp->if_softc; 132 ifp_p = sc->ifv_p; 133 134 /* 135 * If we don't have a parent, just remember the membership for 136 * when we do. 137 */ 138 if (ifp_p == NULL) 139 return(0); 140 141 bzero((char *)&sdl, sizeof sdl); 142 sdl.sdl_len = sizeof sdl; 143 sdl.sdl_family = AF_LINK; 144 sdl.sdl_index = ifp_p->if_index; 145 sdl.sdl_type = IFT_ETHER; 146 sdl.sdl_alen = ETHER_ADDR_LEN; 147 148 /* First, remove any existing filter entries. */ 149 while(SLIST_FIRST(&sc->vlan_mc_listhead) != NULL) { 150 mc = SLIST_FIRST(&sc->vlan_mc_listhead); 151 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 152 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl); 153 if (error) 154 return(error); 155 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries); 156 free(mc, M_VLAN); 157 } 158 159 /* Now program new ones. */ 160 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 161 if (ifma->ifma_addr->sa_family != AF_LINK) 162 continue; 163 mc = malloc(sizeof(struct vlan_mc_entry), M_VLAN, M_WAITOK); 164 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 165 (char *)&mc->mc_addr, ETHER_ADDR_LEN); 166 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries); 167 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr), 168 LLADDR(&sdl), ETHER_ADDR_LEN); 169 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma); 170 if (error) 171 return(error); 172 } 173 174 return(0); 175 } 176 177 static int 178 vlan_modevent(module_t mod, int type, void *data) 179 { 180 181 switch (type) { 182 case MOD_LOAD: 183 LIST_INIT(&ifv_list); 184 vlan_input_p = vlan_input; 185 vlan_input_tag_p = vlan_input_tag; 186 if_clone_attach(&vlan_cloner); 187 break; 188 case MOD_UNLOAD: 189 if_clone_detach(&vlan_cloner); 190 vlan_input_p = NULL; 191 vlan_input_tag_p = NULL; 192 while (!LIST_EMPTY(&ifv_list)) 193 vlan_clone_destroy(&LIST_FIRST(&ifv_list)->ifv_if); 194 break; 195 } 196 return 0; 197 } 198 199 static moduledata_t vlan_mod = { 200 "if_vlan", 201 vlan_modevent, 202 0 203 }; 204 205 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 206 207 static int 208 vlan_clone_create(struct if_clone *ifc, int unit) 209 { 210 struct ifvlan *ifv; 211 struct ifnet *ifp; 212 int s; 213 214 ifv = malloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK); 215 memset(ifv, 0, sizeof(struct ifvlan)); 216 ifp = &ifv->ifv_if; 217 SLIST_INIT(&ifv->vlan_mc_listhead); 218 219 s = splnet(); 220 LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list); 221 splx(s); 222 223 ifp->if_softc = ifv; 224 if_initname(ifp, "vlan", unit); 225 /* NB: flags are not set here */ 226 ifp->if_linkmib = &ifv->ifv_mib; 227 ifp->if_linkmiblen = sizeof ifv->ifv_mib; 228 /* NB: mtu is not set here */ 229 230 ifp->if_init = vlan_ifinit; 231 ifp->if_start = vlan_start; 232 ifp->if_ioctl = vlan_ioctl; 233 ifp->if_output = ether_output; 234 ifp->if_snd.ifq_maxlen = ifqmaxlen; 235 ether_ifattach(ifp, ETHER_BPF_SUPPORTED); 236 /* Now undo some of the damage... */ 237 ifp->if_data.ifi_type = IFT_L2VLAN; 238 ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN; 239 240 return (0); 241 } 242 243 static void 244 vlan_clone_destroy(struct ifnet *ifp) 245 { 246 struct ifvlan *ifv = ifp->if_softc; 247 int s; 248 249 s = splnet(); 250 LIST_REMOVE(ifv, ifv_list); 251 vlan_unconfig(ifp); 252 splx(s); 253 254 ether_ifdetach(ifp, ETHER_BPF_SUPPORTED); 255 256 free(ifv, M_VLAN); 257 } 258 259 static void 260 vlan_ifinit(void *foo) 261 { 262 return; 263 } 264 265 static void 266 vlan_start(struct ifnet *ifp) 267 { 268 struct ifvlan *ifv; 269 struct ifnet *p; 270 struct ether_vlan_header *evl; 271 struct mbuf *m; 272 273 ifv = ifp->if_softc; 274 p = ifv->ifv_p; 275 276 ifp->if_flags |= IFF_OACTIVE; 277 for (;;) { 278 IF_DEQUEUE(&ifp->if_snd, m); 279 if (m == 0) 280 break; 281 if (ifp->if_bpf) 282 bpf_mtap(ifp, m); 283 284 /* 285 * Do not run parent's if_start() if the parent is not up, 286 * or parent's driver will cause a system crash. 287 */ 288 if ((p->if_flags & (IFF_UP | IFF_RUNNING)) != 289 (IFF_UP | IFF_RUNNING)) { 290 m_freem(m); 291 ifp->if_data.ifi_collisions++; 292 continue; 293 } 294 295 /* 296 * If the LINK0 flag is set, it means the underlying interface 297 * can do VLAN tag insertion itself and doesn't require us to 298 * create a special header for it. In this case, we just pass 299 * the packet along. However, we need some way to tell the 300 * interface where the packet came from so that it knows how 301 * to find the VLAN tag to use, so we set the rcvif in the 302 * mbuf header to our ifnet. 303 * 304 * Note: we also set the M_PROTO1 flag in the mbuf to let 305 * the parent driver know that the rcvif pointer is really 306 * valid. We need to do this because sometimes mbufs will 307 * be allocated by other parts of the system that contain 308 * garbage in the rcvif pointer. Using the M_PROTO1 flag 309 * lets the driver perform a proper sanity check and avoid 310 * following potentially bogus rcvif pointers off into 311 * never-never land. 312 */ 313 if (ifp->if_flags & IFF_LINK0) { 314 m->m_pkthdr.rcvif = ifp; 315 m->m_flags |= M_PROTO1; 316 } else { 317 M_PREPEND(m, EVL_ENCAPLEN, M_DONTWAIT); 318 if (m == NULL) { 319 printf("%s: M_PREPEND failed", ifp->if_xname); 320 ifp->if_ierrors++; 321 continue; 322 } 323 /* M_PREPEND takes care of m_len, m_pkthdr.len for us */ 324 325 m = m_pullup(m, ETHER_HDR_LEN + EVL_ENCAPLEN); 326 if (m == NULL) { 327 printf("%s: m_pullup failed", ifp->if_xname); 328 ifp->if_ierrors++; 329 continue; 330 } 331 332 /* 333 * Transform the Ethernet header into an Ethernet header 334 * with 802.1Q encapsulation. 335 */ 336 bcopy(mtod(m, char *) + EVL_ENCAPLEN, mtod(m, char *), 337 sizeof(struct ether_header)); 338 evl = mtod(m, struct ether_vlan_header *); 339 evl->evl_proto = evl->evl_encap_proto; 340 evl->evl_encap_proto = htons(ETHERTYPE_VLAN); 341 evl->evl_tag = htons(ifv->ifv_tag); 342 #ifdef DEBUG 343 printf("vlan_start: %*D\n", sizeof *evl, 344 (unsigned char *)evl, ":"); 345 #endif 346 } 347 348 /* 349 * Send it, precisely as ether_output() would have. 350 * We are already running at splimp. 351 */ 352 if (IF_QFULL(&p->if_snd)) { 353 IF_DROP(&p->if_snd); 354 /* XXX stats */ 355 ifp->if_oerrors++; 356 m_freem(m); 357 continue; 358 } 359 IF_ENQUEUE(&p->if_snd, m); 360 ifp->if_opackets++; 361 p->if_obytes += m->m_pkthdr.len; 362 if (m->m_flags & M_MCAST) 363 p->if_omcasts++; 364 if ((p->if_flags & IFF_OACTIVE) == 0) 365 p->if_start(p); 366 } 367 ifp->if_flags &= ~IFF_OACTIVE; 368 369 return; 370 } 371 372 static int 373 vlan_input_tag(struct ether_header *eh, struct mbuf *m, u_int16_t t) 374 { 375 struct ifvlan *ifv; 376 377 /* 378 * Fake up a header and send the packet to the physical interface's 379 * bpf tap if active. 380 */ 381 if (m->m_pkthdr.rcvif->if_bpf != NULL) { 382 struct m_hdr mh; 383 struct ether_vlan_header evh; 384 385 bcopy(eh, &evh, 2*ETHER_ADDR_LEN); 386 evh.evl_encap_proto = htons(ETHERTYPE_VLAN); 387 evh.evl_tag = htons(t); 388 evh.evl_proto = eh->ether_type; 389 390 /* This kludge is OK; BPF treats the "mbuf" as read-only */ 391 mh.mh_next = m; 392 mh.mh_data = (char *)&evh; 393 mh.mh_len = ETHER_HDR_LEN + EVL_ENCAPLEN; 394 bpf_mtap(m->m_pkthdr.rcvif, (struct mbuf *)&mh); 395 } 396 397 for (ifv = LIST_FIRST(&ifv_list); ifv != NULL; 398 ifv = LIST_NEXT(ifv, ifv_list)) { 399 if (m->m_pkthdr.rcvif == ifv->ifv_p 400 && ifv->ifv_tag == t) 401 break; 402 } 403 404 if (ifv == NULL || (ifv->ifv_if.if_flags & IFF_UP) == 0) { 405 m_freem(m); 406 return -1; /* So the parent can take note */ 407 } 408 409 /* 410 * Having found a valid vlan interface corresponding to 411 * the given source interface and vlan tag, run the 412 * the real packet through ether_input(). 413 */ 414 m->m_pkthdr.rcvif = &ifv->ifv_if; 415 416 ifv->ifv_if.if_ipackets++; 417 ether_input(&ifv->ifv_if, eh, m); 418 return 0; 419 } 420 421 static int 422 vlan_input(struct ether_header *eh, struct mbuf *m) 423 { 424 struct ifvlan *ifv; 425 426 for (ifv = LIST_FIRST(&ifv_list); ifv != NULL; 427 ifv = LIST_NEXT(ifv, ifv_list)) { 428 if (m->m_pkthdr.rcvif == ifv->ifv_p 429 && (EVL_VLANOFTAG(ntohs(*mtod(m, u_int16_t *))) 430 == ifv->ifv_tag)) 431 break; 432 } 433 434 if (ifv == NULL || (ifv->ifv_if.if_flags & IFF_UP) == 0) { 435 m->m_pkthdr.rcvif->if_noproto++; 436 m_freem(m); 437 return -1; /* so ether_input can take note */ 438 } 439 440 /* 441 * Having found a valid vlan interface corresponding to 442 * the given source interface and vlan tag, remove the 443 * encapsulation, and run the real packet through 444 * ether_input() a second time (it had better be 445 * reentrant!). 446 */ 447 m->m_pkthdr.rcvif = &ifv->ifv_if; 448 eh->ether_type = mtod(m, u_int16_t *)[1]; 449 m->m_data += EVL_ENCAPLEN; 450 m->m_len -= EVL_ENCAPLEN; 451 m->m_pkthdr.len -= EVL_ENCAPLEN; 452 453 ifv->ifv_if.if_ipackets++; 454 ether_input(&ifv->ifv_if, eh, m); 455 return 0; 456 } 457 458 static int 459 vlan_config(struct ifvlan *ifv, struct ifnet *p) 460 { 461 struct ifaddr *ifa1, *ifa2; 462 struct sockaddr_dl *sdl1, *sdl2; 463 464 if (p->if_data.ifi_type != IFT_ETHER) 465 return EPROTONOSUPPORT; 466 if (ifv->ifv_p) 467 return EBUSY; 468 ifv->ifv_p = p; 469 if (p->if_data.ifi_hdrlen == sizeof(struct ether_vlan_header)) 470 ifv->ifv_if.if_mtu = p->if_mtu; 471 else 472 ifv->ifv_if.if_mtu = p->if_data.ifi_mtu - EVL_ENCAPLEN; 473 474 /* 475 * Copy only a selected subset of flags from the parent. 476 * Other flags are none of our business. 477 */ 478 ifv->ifv_if.if_flags = (p->if_flags & 479 (IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX | IFF_POINTOPOINT)); 480 481 /* 482 * Set up our ``Ethernet address'' to reflect the underlying 483 * physical interface's. 484 */ 485 ifa1 = ifnet_addrs[ifv->ifv_if.if_index - 1]; 486 ifa2 = ifnet_addrs[p->if_index - 1]; 487 sdl1 = (struct sockaddr_dl *)ifa1->ifa_addr; 488 sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr; 489 sdl1->sdl_type = IFT_ETHER; 490 sdl1->sdl_alen = ETHER_ADDR_LEN; 491 bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN); 492 bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 493 494 /* 495 * Configure multicast addresses that may already be 496 * joined on the vlan device. 497 */ 498 (void)vlan_setmulti(&ifv->ifv_if); 499 500 return 0; 501 } 502 503 static int 504 vlan_unconfig(struct ifnet *ifp) 505 { 506 struct ifaddr *ifa; 507 struct sockaddr_dl *sdl; 508 struct vlan_mc_entry *mc; 509 struct ifvlan *ifv; 510 struct ifnet *p; 511 int error; 512 513 ifv = ifp->if_softc; 514 p = ifv->ifv_p; 515 516 if (p) { 517 struct sockaddr_dl sdl; 518 519 /* 520 * Since the interface is being unconfigured, we need to 521 * empty the list of multicast groups that we may have joined 522 * while we were alive from the parent's list. 523 */ 524 bzero((char *)&sdl, sizeof sdl); 525 sdl.sdl_len = sizeof sdl; 526 sdl.sdl_family = AF_LINK; 527 sdl.sdl_index = p->if_index; 528 sdl.sdl_type = IFT_ETHER; 529 sdl.sdl_alen = ETHER_ADDR_LEN; 530 531 while(SLIST_FIRST(&ifv->vlan_mc_listhead) != NULL) { 532 mc = SLIST_FIRST(&ifv->vlan_mc_listhead); 533 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN); 534 error = if_delmulti(p, (struct sockaddr *)&sdl); 535 if (error) 536 return(error); 537 SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries); 538 free(mc, M_VLAN); 539 } 540 } 541 542 /* Disconnect from parent. */ 543 ifv->ifv_p = NULL; 544 ifv->ifv_if.if_mtu = ETHERMTU; 545 546 /* Clear our MAC address. */ 547 ifa = ifnet_addrs[ifv->ifv_if.if_index - 1]; 548 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 549 sdl->sdl_type = IFT_ETHER; 550 sdl->sdl_alen = ETHER_ADDR_LEN; 551 bzero(LLADDR(sdl), ETHER_ADDR_LEN); 552 bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN); 553 554 return 0; 555 } 556 557 static int 558 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 559 { 560 struct ifaddr *ifa; 561 struct ifnet *p; 562 struct ifreq *ifr; 563 struct ifvlan *ifv; 564 struct vlanreq vlr; 565 int error = 0; 566 567 ifr = (struct ifreq *)data; 568 ifa = (struct ifaddr *)data; 569 ifv = ifp->if_softc; 570 571 switch (cmd) { 572 case SIOCSIFADDR: 573 ifp->if_flags |= IFF_UP; 574 575 switch (ifa->ifa_addr->sa_family) { 576 #ifdef INET 577 case AF_INET: 578 arp_ifinit(&ifv->ifv_if, ifa); 579 break; 580 #endif 581 default: 582 break; 583 } 584 break; 585 586 case SIOCGIFADDR: 587 { 588 struct sockaddr *sa; 589 590 sa = (struct sockaddr *) &ifr->ifr_data; 591 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr, 592 (caddr_t) sa->sa_data, ETHER_ADDR_LEN); 593 } 594 break; 595 596 case SIOCGIFMEDIA: 597 if (ifv->ifv_p != NULL) { 598 error = (ifv->ifv_p->if_ioctl)(ifv->ifv_p, SIOCGIFMEDIA, data); 599 /* Limit the result to the parent's current config. */ 600 if (error == 0) { 601 struct ifmediareq *ifmr; 602 603 ifmr = (struct ifmediareq *) data; 604 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) { 605 ifmr->ifm_count = 1; 606 error = copyout(&ifmr->ifm_current, 607 ifmr->ifm_ulist, 608 sizeof(int)); 609 } 610 } 611 } else 612 error = EINVAL; 613 break; 614 615 case SIOCSIFMEDIA: 616 error = EINVAL; 617 break; 618 619 case SIOCSIFMTU: 620 /* 621 * Set the interface MTU. 622 * This is bogus. The underlying interface might support 623 * jumbo frames. 624 */ 625 if (ifr->ifr_mtu > ETHERMTU) { 626 error = EINVAL; 627 } else { 628 ifp->if_mtu = ifr->ifr_mtu; 629 } 630 break; 631 632 case SIOCSETVLAN: 633 error = copyin(ifr->ifr_data, &vlr, sizeof vlr); 634 if (error) 635 break; 636 if (vlr.vlr_parent[0] == '\0') { 637 vlan_unconfig(ifp); 638 if (ifp->if_flags & IFF_UP) { 639 int s = splimp(); 640 if_down(ifp); 641 splx(s); 642 } 643 ifp->if_flags &= ~IFF_RUNNING; 644 break; 645 } 646 p = ifunit(vlr.vlr_parent); 647 if (p == 0) { 648 error = ENOENT; 649 break; 650 } 651 error = vlan_config(ifv, p); 652 if (error) 653 break; 654 ifv->ifv_tag = vlr.vlr_tag; 655 ifp->if_flags |= IFF_RUNNING; 656 break; 657 658 case SIOCGETVLAN: 659 bzero(&vlr, sizeof vlr); 660 if (ifv->ifv_p) { 661 strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname, 662 sizeof(vlr.vlr_parent)); 663 vlr.vlr_tag = ifv->ifv_tag; 664 } 665 error = copyout(&vlr, ifr->ifr_data, sizeof vlr); 666 break; 667 668 case SIOCSIFFLAGS: 669 /* 670 * We don't support promiscuous mode 671 * right now because it would require help from the 672 * underlying drivers, which hasn't been implemented. 673 */ 674 if (ifr->ifr_flags & (IFF_PROMISC)) { 675 ifp->if_flags &= ~(IFF_PROMISC); 676 error = EINVAL; 677 } 678 break; 679 case SIOCADDMULTI: 680 case SIOCDELMULTI: 681 error = vlan_setmulti(ifp); 682 break; 683 default: 684 error = EINVAL; 685 } 686 return error; 687 } 688