sys/net/vlan/if_vlan.c

   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 1.26 2008/01/11 11:59:41 sephe 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/systm.h>
  65 #include <sys/kernel.h>
  66 #include <sys/malloc.h>
  67 #include <sys/mbuf.h>
  68 #include <sys/module.h>
  69 #include <sys/queue.h>
  70 #include <sys/socket.h>
  71 #include <sys/sockio.h>
  72 #include <sys/sysctl.h>
  73 #include <sys/bus.h>
  74 #include <sys/thread2.h>
  75
  76 #include <net/bpf.h>
  77 #include <net/ethernet.h>
  78 #include <net/if.h>
  79 #include <net/if_arp.h>
  80 #include <net/if_dl.h>
  81 #include <net/if_types.h>
  82 #include <net/ifq_var.h>
  83 #include <net/if_clone.h>
  84 #include "if_vlan_var.h"
  85
  86 #ifdef INET
  87 #include <netinet/in.h>
  88 #include <netinet/if_ether.h>
  89 #endif
  90
  91 #define VLANNAME        "vlan"
  92
  93 SYSCTL_DECL(_net_link);
  94 SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW, 0, "IEEE 802.1Q VLAN");
  95 SYSCTL_NODE(_net_link_vlan, PF_LINK, link, CTLFLAG_RW, 0, "for consistency");
  96
  97 static MALLOC_DEFINE(M_VLAN, "vlan", "802.1Q Virtual LAN Interface");
  98 static LIST_HEAD(, ifvlan) ifv_list;
  99
 100 static  int vlan_clone_create(struct if_clone *, int);
 101 static  void vlan_clone_destroy(struct ifnet *);
 102 static  void vlan_start(struct ifnet *ifp);
 103 static  void vlan_ifinit(void *foo);
 104 static  int vlan_input(const struct ether_header *eh, struct mbuf *m);
 105 static  int vlan_input_tag(struct mbuf *m, uint16_t t);
 106 static  int vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr,
 107                 struct ucred *cr);
 108 static  int vlan_setmulti(struct ifnet *ifp);
 109 static  int vlan_unconfig(struct ifnet *ifp);
 110 static  int vlan_config(struct ifvlan *ifv, struct ifnet *p);
 111
 112 struct if_clone vlan_cloner = IF_CLONE_INITIALIZER("vlan", vlan_clone_create,
 113     vlan_clone_destroy, NVLAN, IF_MAXUNIT);
 114
 115 /*
 116  * Program our multicast filter. What we're actually doing is
 117  * programming the multicast filter of the parent. This has the
 118  * side effect of causing the parent interface to receive multicast
 119  * traffic that it doesn't really want, which ends up being discarded
 120  * later by the upper protocol layers. Unfortunately, there's no way
 121  * to avoid this: there really is only one physical interface.
 122  */
 123 static int
 124 vlan_setmulti(struct ifnet *ifp)
 125 {
 126         struct ifnet            *ifp_p;
 127         struct ifmultiaddr      *ifma, *rifma = NULL;
 128         struct ifvlan           *sc;
 129         struct vlan_mc_entry    *mc = NULL;
 130         struct sockaddr_dl      sdl;
 131         int                     error;
 132
 133         /* Find the parent. */
 134         sc = ifp->if_softc;
 135         ifp_p = sc->ifv_p;
 136
 137         /*
 138          * If we don't have a parent, just remember the membership for
 139          * when we do.
 140          */
 141         if (ifp_p == NULL)
 142                 return(0);
 143
 144         bzero((char *)&sdl, sizeof sdl);
 145         sdl.sdl_len = sizeof sdl;
 146         sdl.sdl_family = AF_LINK;
 147         sdl.sdl_index = ifp_p->if_index;
 148         sdl.sdl_type = IFT_ETHER;
 149         sdl.sdl_alen = ETHER_ADDR_LEN;
 150
 151         /* First, remove any existing filter entries. */
 152         while(SLIST_FIRST(&sc->vlan_mc_listhead) != NULL) {
 153                 mc = SLIST_FIRST(&sc->vlan_mc_listhead);
 154                 bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN);
 155                 error = if_delmulti(ifp_p, (struct sockaddr *)&sdl);
 156                 if (error)
 157                         return(error);
 158                 SLIST_REMOVE_HEAD(&sc->vlan_mc_listhead, mc_entries);
 159                 kfree(mc, M_VLAN);
 160         }
 161
 162         /* Now program new ones. */
 163         LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
 164                 if (ifma->ifma_addr->sa_family != AF_LINK)
 165                         continue;
 166                 mc = kmalloc(sizeof(struct vlan_mc_entry), M_VLAN, M_WAITOK);
 167                 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
 168                     (char *)&mc->mc_addr, ETHER_ADDR_LEN);
 169                 SLIST_INSERT_HEAD(&sc->vlan_mc_listhead, mc, mc_entries);
 170                 bcopy(LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
 171                     LLADDR(&sdl), ETHER_ADDR_LEN);
 172                 error = if_addmulti(ifp_p, (struct sockaddr *)&sdl, &rifma);
 173                 if (error)
 174                         return(error);
 175         }
 176
 177         return(0);
 178 }
 179
 180 static int
 181 vlan_modevent(module_t mod, int type, void *data)
 182 {
 183
 184         switch (type) {
 185         case MOD_LOAD:
 186                 LIST_INIT(&ifv_list);
 187                 vlan_input_p = vlan_input;
 188                 vlan_input_tag_p = vlan_input_tag;
 189                 if_clone_attach(&vlan_cloner);
 190                 break;
 191         case MOD_UNLOAD:
 192                 if_clone_detach(&vlan_cloner);
 193                 vlan_input_p = NULL;
 194                 vlan_input_tag_p = NULL;
 195                 while (!LIST_EMPTY(&ifv_list))
 196                         vlan_clone_destroy(&LIST_FIRST(&ifv_list)->ifv_if);
 197                 break;
 198         }
 199         return 0;
 200 }
 201
 202 static moduledata_t vlan_mod = {
 203         "if_vlan",
 204         vlan_modevent,
 205         0
 206 };
 207
 208 DECLARE_MODULE(if_vlan, vlan_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 209
 210 static int
 211 vlan_clone_create(struct if_clone *ifc, int unit)
 212 {
 213         struct ifvlan *ifv;
 214         struct ifnet *ifp;
 215
 216         ifv = kmalloc(sizeof(struct ifvlan), M_VLAN, M_WAITOK | M_ZERO);
 217         ifp = &ifv->ifv_if;
 218         SLIST_INIT(&ifv->vlan_mc_listhead);
 219
 220         crit_enter();
 221         LIST_INSERT_HEAD(&ifv_list, ifv, ifv_list);
 222         crit_exit();
 223
 224         ifp->if_softc = ifv;
 225         if_initname(ifp, "vlan", unit);
 226         /* NB: flags are not set here */
 227         ifp->if_linkmib = &ifv->ifv_mib;
 228         ifp->if_linkmiblen = sizeof ifv->ifv_mib;
 229         /* NB: mtu is not set here */
 230
 231         ifp->if_init = vlan_ifinit;
 232         ifp->if_start = vlan_start;
 233         ifp->if_ioctl = vlan_ioctl;
 234         ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
 235         ifq_set_ready(&ifp->if_snd);
 236         ether_ifattach(ifp, ifv->ifv_ac.ac_enaddr, NULL);
 237         /* Now undo some of the damage... */
 238         ifp->if_data.ifi_type = IFT_L2VLAN;
 239         ifp->if_data.ifi_hdrlen = EVL_ENCAPLEN;
 240
 241         return (0);
 242 }
 243
 244 static void
 245 vlan_clone_destroy(struct ifnet *ifp)
 246 {
 247         struct ifvlan *ifv = ifp->if_softc;
 248
 249         crit_enter();
 250
 251         LIST_REMOVE(ifv, ifv_list);
 252         vlan_unconfig(ifp);
 253         ether_ifdetach(ifp);
 254
 255         crit_exit();
 256
 257         kfree(ifv, M_VLAN);
 258 }
 259
 260 static void
 261 vlan_ifinit(void *foo)
 262 {
 263         return;
 264 }
 265
 266 static void
 267 vlan_start(struct ifnet *ifp)
 268 {
 269         struct ifvlan *ifv;
 270         struct ifnet *p;
 271         struct ether_vlan_header *evl;
 272         struct mbuf *m;
 273         int error;
 274         struct altq_pktattr pktattr;
 275
 276         ifv = ifp->if_softc;
 277         p = ifv->ifv_p;
 278
 279         ifp->if_flags |= IFF_OACTIVE;
 280         for (;;) {
 281                 m = ifq_dequeue(&ifp->if_snd, NULL);
 282                 if (m == NULL)
 283                         break;
 284                 BPF_MTAP(ifp, m);
 285
 286                 /*
 287                  * Do not run parent's if_start() if the parent is not up,
 288                  * or parent's driver will cause a system crash.
 289                  */
 290                 if ((p->if_flags & (IFF_UP | IFF_RUNNING)) !=
 291                                         (IFF_UP | IFF_RUNNING)) {
 292                         m_freem(m);
 293                         ifp->if_data.ifi_collisions++;
 294                         continue;
 295                 }
 296
 297                 /*
 298                  * If ALTQ is enabled on the parent interface, do
 299                  * classification; the queueing discipline might
 300                  * not require classification, but might require
 301                  * the address family/header pointer in the pktattr.
 302                  */
 303                 if (ifq_is_enabled(&p->if_snd))
 304                         altq_etherclassify(&p->if_snd, m, &pktattr);
 305
 306                 /*
 307                  * If underlying interface can do VLAN tag insertion itself,
 308                  * just pass the packet along. However, we need some way to
 309                  * tell the interface where the packet came from so that it
 310                  * knows how to find the VLAN tag to use, so we set the rcvif
 311                  * in the mbuf header to our ifnet.
 312                  *
 313                  * Note: we also set the M_PROTO1 flag in the mbuf to let
 314                  * the parent driver know that the rcvif pointer is really
 315                  * valid. We need to do this because sometimes mbufs will
 316                  * be allocated by other parts of the system that contain
 317                  * garbage in the rcvif pointer. Using the M_PROTO1 flag
 318                  * lets the driver perform a proper sanity check and avoid
 319                  * following potentially bogus rcvif pointers off into
 320                  * never-never land.
 321                  */
 322                 if (p->if_capenable & IFCAP_VLAN_HWTAGGING) {
 323                         m->m_pkthdr.rcvif = ifp;
 324                         m->m_flags |= M_PROTO1;
 325                 } else {
 326                         M_PREPEND(m, EVL_ENCAPLEN, MB_DONTWAIT);
 327                         if (m == NULL) {
 328                                 kprintf("%s: M_PREPEND failed", ifp->if_xname);
 329                                 ifp->if_ierrors++;
 330                                 continue;
 331                         }
 332                         /* M_PREPEND takes care of m_len, m_pkthdr.len for us */
 333
 334                         m = m_pullup(m, ETHER_HDR_LEN + EVL_ENCAPLEN);
 335                         if (m == NULL) {
 336                                 kprintf("%s: m_pullup failed", ifp->if_xname);
 337                                 ifp->if_ierrors++;
 338                                 continue;
 339                         }
 340
 341                         /*
 342                          * Transform the Ethernet header into an Ethernet header
 343                          * with 802.1Q encapsulation.
 344                          */
 345                         bcopy(mtod(m, char *) + EVL_ENCAPLEN, mtod(m, char *),
 346                               sizeof(struct ether_header));
 347                         evl = mtod(m, struct ether_vlan_header *);
 348                         evl->evl_proto = evl->evl_encap_proto;
 349                         evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
 350                         evl->evl_tag = htons(ifv->ifv_tag);
 351 #ifdef DEBUG
 352                         kprintf("vlan_start: %*D\n", sizeof *evl,
 353                             (unsigned char *)evl, ":");
 354 #endif
 355                 }
 356
 357                 /*
 358                  * Send it, precisely as ether_output() would have.
 359                  * We are already running at splimp.
 360                  */
 361                 lwkt_serialize_exit(ifp->if_serializer);
 362                 lwkt_serialize_enter(p->if_serializer);
 363                 error = ifq_handoff(p, m, &pktattr);
 364                 lwkt_serialize_exit(p->if_serializer);
 365                 lwkt_serialize_enter(ifp->if_serializer);
 366                 if (error)
 367                         ifp->if_oerrors++;
 368                 else
 369                         ifp->if_opackets++;
 370         }
 371         ifp->if_flags &= ~IFF_OACTIVE;
 372
 373         return;
 374 }
 375
 376 static int
 377 vlan_input_tag( struct mbuf *m, uint16_t t)
 378 {
 379         struct bpf_if *bif;
 380         struct ifvlan *ifv;
 381         struct ifnet *rcvif;
 382
 383         rcvif = m->m_pkthdr.rcvif;
 384
 385         ASSERT_SERIALIZED(rcvif->if_serializer);
 386
 387         /*
 388          * Fake up a header and send the packet to the physical interface's
 389          * bpf tap if active.
 390          */
 391         if ((bif = rcvif->if_bpf) != NULL) {
 392                 struct ether_header *eh;
 393                 struct ether_vlan_header evh;
 394
 395                 eh = mtod(m, struct ether_header *);
 396                 m_adj(m, ETHER_HDR_LEN);
 397                 bcopy(eh, &evh, 2*ETHER_ADDR_LEN);
 398                 evh.evl_encap_proto = htons(ETHERTYPE_VLAN);
 399                 evh.evl_tag = htons(t);
 400                 evh.evl_proto = eh->ether_type;
 401                 bpf_ptap(bif, m, &evh, ETHER_HDR_LEN + EVL_ENCAPLEN);
 402                 /* XXX assumes data was left intact */
 403                 M_PREPEND(m, ETHER_HDR_LEN, MB_WAIT);
 404         }
 405
 406         for (ifv = LIST_FIRST(&ifv_list); ifv != NULL;
 407             ifv = LIST_NEXT(ifv, ifv_list)) {
 408                 if (rcvif == ifv->ifv_p && ifv->ifv_tag == t)
 409                         break;
 410         }
 411
 412         if (ifv == NULL || (ifv->ifv_if.if_flags & IFF_UP) == 0) {
 413                 m_freem(m);
 414                 return -1;      /* So the parent can take note */
 415         }
 416
 417         /*
 418          * Having found a valid vlan interface corresponding to
 419          * the given source interface and vlan tag, run the
 420          * the real packet through ether_input().
 421          */
 422         m->m_pkthdr.rcvif = &ifv->ifv_if;
 423
 424         ifv->ifv_if.if_ipackets++;
 425         lwkt_serialize_exit(rcvif->if_serializer);
 426         lwkt_serialize_enter(ifv->ifv_if.if_serializer);
 427         ether_input(&ifv->ifv_if, m);
 428         lwkt_serialize_exit(ifv->ifv_if.if_serializer);
 429         lwkt_serialize_enter(rcvif->if_serializer);
 430         return 0;
 431 }
 432
 433 static int
 434 vlan_input(const struct ether_header *eh, struct mbuf *m)
 435 {
 436         struct ifvlan *ifv;
 437         struct ifnet *rcvif;
 438         struct ether_header eh_copy;
 439
 440         rcvif = m->m_pkthdr.rcvif;
 441         ASSERT_SERIALIZED(rcvif->if_serializer);
 442
 443         for (ifv = LIST_FIRST(&ifv_list); ifv != NULL;
 444             ifv = LIST_NEXT(ifv, ifv_list)) {
 445                 if (rcvif == ifv->ifv_p
 446                     && (EVL_VLANOFTAG(ntohs(*mtod(m, u_int16_t *)))
 447                         == ifv->ifv_tag))
 448                         break;
 449         }
 450
 451         if (ifv == NULL || (ifv->ifv_if.if_flags & IFF_UP) == 0) {
 452                 rcvif->if_noproto++;
 453                 m_freem(m);
 454                 return -1;      /* so ether_input can take note */
 455         }
 456
 457         /*
 458          * Having found a valid vlan interface corresponding to
 459          * the given source interface and vlan tag, remove the
 460          * remaining encapsulation (ether_vlan_header minus the ether_header
 461          * that had already been removed) and run the real packet
 462          * through ether_input() a second time (it had better be
 463          * reentrant!).
 464          */
 465         eh_copy = *eh;
 466         eh_copy.ether_type = mtod(m, u_int16_t *)[1];   /* evl_proto */
 467         m->m_pkthdr.rcvif = &ifv->ifv_if;
 468         m_adj(m, EVL_ENCAPLEN);
 469         M_PREPEND(m, ETHER_HDR_LEN, MB_WAIT);
 470         *(struct ether_header *)mtod(m, void *) = eh_copy;
 471
 472         ifv->ifv_if.if_ipackets++;
 473         lwkt_serialize_exit(rcvif->if_serializer);
 474         lwkt_serialize_enter(ifv->ifv_if.if_serializer);
 475         ether_input(&ifv->ifv_if, m);
 476         lwkt_serialize_exit(ifv->ifv_if.if_serializer);
 477         lwkt_serialize_enter(rcvif->if_serializer);
 478         return 0;
 479 }
 480
 481 static int
 482 vlan_config(struct ifvlan *ifv, struct ifnet *p)
 483 {
 484         struct sockaddr_dl *sdl1, *sdl2;
 485
 486         if (p->if_data.ifi_type != IFT_ETHER)
 487                 return EPROTONOSUPPORT;
 488         if (ifv->ifv_p)
 489                 return EBUSY;
 490         ifv->ifv_p = p;
 491         if (p->if_capenable & IFCAP_VLAN_MTU)
 492                 ifv->ifv_if.if_mtu = p->if_mtu;
 493         else
 494                 ifv->ifv_if.if_mtu = p->if_data.ifi_mtu - EVL_ENCAPLEN;
 495
 496         /*
 497          * Copy only a selected subset of flags from the parent.
 498          * Other flags are none of our business.
 499          */
 500         ifv->ifv_if.if_flags = (p->if_flags &
 501             (IFF_BROADCAST | IFF_MULTICAST | IFF_SIMPLEX | IFF_POINTOPOINT));
 502
 503         /*
 504          * Set up our ``Ethernet address'' to reflect the underlying
 505          * physical interface's.
 506          */
 507         sdl1 = IF_LLSOCKADDR(&ifv->ifv_if);
 508         sdl2 = IF_LLSOCKADDR(p);
 509         sdl1->sdl_type = IFT_ETHER;
 510         sdl1->sdl_alen = ETHER_ADDR_LEN;
 511         bcopy(LLADDR(sdl2), LLADDR(sdl1), ETHER_ADDR_LEN);
 512         bcopy(LLADDR(sdl2), ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN);
 513
 514         /*
 515          * Configure multicast addresses that may already be
 516          * joined on the vlan device.
 517          */
 518         vlan_setmulti(&ifv->ifv_if);
 519
 520         return 0;
 521 }
 522
 523 static int
 524 vlan_unconfig(struct ifnet *ifp)
 525 {
 526         struct sockaddr_dl *sdl;
 527         struct vlan_mc_entry *mc;
 528         struct ifvlan *ifv;
 529         struct ifnet *p;
 530         int error;
 531
 532         ifv = ifp->if_softc;
 533         p = ifv->ifv_p;
 534
 535         if (p) {
 536                 struct sockaddr_dl sdl;
 537
 538                 /*
 539                  * Since the interface is being unconfigured, we need to
 540                  * empty the list of multicast groups that we may have joined
 541                  * while we were alive from the parent's list.
 542                  */
 543                 bzero((char *)&sdl, sizeof sdl);
 544                 sdl.sdl_len = sizeof sdl;
 545                 sdl.sdl_family = AF_LINK;
 546                 sdl.sdl_index = p->if_index;
 547                 sdl.sdl_type = IFT_ETHER;
 548                 sdl.sdl_alen = ETHER_ADDR_LEN;
 549
 550                 while(SLIST_FIRST(&ifv->vlan_mc_listhead) != NULL) {
 551                         mc = SLIST_FIRST(&ifv->vlan_mc_listhead);
 552                         bcopy((char *)&mc->mc_addr, LLADDR(&sdl), ETHER_ADDR_LEN);
 553                         error = if_delmulti(p, (struct sockaddr *)&sdl);
 554                         if (error)
 555                                 return(error);
 556                         SLIST_REMOVE_HEAD(&ifv->vlan_mc_listhead, mc_entries);
 557                         kfree(mc, M_VLAN);
 558                 }
 559         }
 560
 561         /* Disconnect from parent. */
 562         ifv->ifv_p = NULL;
 563         ifv->ifv_if.if_mtu = ETHERMTU;
 564
 565         /* Clear our MAC address. */
 566         sdl = IF_LLSOCKADDR(&ifv->ifv_if);
 567         sdl->sdl_type = IFT_ETHER;
 568         sdl->sdl_alen = ETHER_ADDR_LEN;
 569         bzero(LLADDR(sdl), ETHER_ADDR_LEN);
 570         bzero(ifv->ifv_ac.ac_enaddr, ETHER_ADDR_LEN);
 571
 572         return 0;
 573 }
 574
 575 static int
 576 vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 577 {
 578         struct ifaddr *ifa;
 579         struct ifnet *p;
 580         struct ifreq *ifr;
 581         struct ifvlan *ifv;
 582         struct vlanreq vlr;
 583         int error = 0;
 584
 585         ifr = (struct ifreq *)data;
 586         ifa = (struct ifaddr *)data;
 587         ifv = ifp->if_softc;
 588
 589         ASSERT_SERIALIZED(ifp->if_serializer);
 590         crit_enter();
 591
 592         switch (cmd) {
 593         case SIOCSIFADDR:
 594                 ifp->if_flags |= IFF_UP;
 595
 596                 switch (ifa->ifa_addr->sa_family) {
 597 #ifdef INET
 598                 case AF_INET:
 599                         arp_ifinit(&ifv->ifv_if, ifa);
 600                         break;
 601 #endif
 602                 default:
 603                         break;
 604                 }
 605                 break;
 606
 607         case SIOCGIFADDR:
 608                 {
 609                         struct sockaddr *sa;
 610
 611                         sa = (struct sockaddr *) &ifr->ifr_data;
 612                         bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
 613                               (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
 614                 }
 615                 break;
 616
 617         case SIOCGIFMEDIA:
 618                 if (ifv->ifv_p != NULL) {
 619                         lwkt_serialize_exit(ifp->if_serializer);
 620                         lwkt_serialize_enter(ifv->ifv_p->if_serializer);
 621                         error = ifv->ifv_p->if_ioctl(ifv->ifv_p,
 622                                                      SIOCGIFMEDIA, data, cr);
 623                         lwkt_serialize_exit(ifv->ifv_p->if_serializer);
 624                         lwkt_serialize_enter(ifp->if_serializer);
 625                         /* Limit the result to the parent's current config. */
 626                         if (error == 0) {
 627                                 struct ifmediareq *ifmr;
 628
 629                                 ifmr = (struct ifmediareq *) data;
 630                                 if (ifmr->ifm_count >= 1 && ifmr->ifm_ulist) {
 631                                         ifmr->ifm_count = 1;
 632                                         error = copyout(&ifmr->ifm_current,
 633                                                 ifmr->ifm_ulist,
 634                                                 sizeof(int));
 635                                 }
 636                         }
 637                 } else
 638                         error = EINVAL;
 639                 break;
 640
 641         case SIOCSIFMEDIA:
 642                 error = EINVAL;
 643                 break;
 644
 645         case SIOCSIFMTU:
 646                 /*
 647                  * Set the interface MTU.
 648                  * This is bogus. The underlying interface might support
 649                  * jumbo frames.
 650                  */
 651                 if (ifr->ifr_mtu > ETHERMTU) {
 652                         error = EINVAL;
 653                 } else {
 654                         ifp->if_mtu = ifr->ifr_mtu;
 655                 }
 656                 break;
 657
 658         case SIOCSETVLAN:
 659                 error = copyin(ifr->ifr_data, &vlr, sizeof vlr);
 660                 if (error)
 661                         break;
 662                 if (vlr.vlr_parent[0] == '\0') {
 663                         vlan_unconfig(ifp);
 664                         if (ifp->if_flags & IFF_UP)
 665                                 if_down(ifp);
 666                         ifp->if_flags &= ~IFF_RUNNING;
 667                         break;
 668                 }
 669                 p = ifunit(vlr.vlr_parent);
 670                 if (p == 0) {
 671                         error = ENOENT;
 672                         break;
 673                 }
 674                 error = vlan_config(ifv, p);
 675                 if (error)
 676                         break;
 677                 ifv->ifv_tag = vlr.vlr_tag;
 678                 ifp->if_flags |= IFF_RUNNING;
 679                 break;
 680
 681         case SIOCGETVLAN:
 682                 bzero(&vlr, sizeof vlr);
 683                 if (ifv->ifv_p) {
 684                         strlcpy(vlr.vlr_parent, ifv->ifv_p->if_xname,
 685                             sizeof(vlr.vlr_parent));
 686                         vlr.vlr_tag = ifv->ifv_tag;
 687                 }
 688                 error = copyout(&vlr, ifr->ifr_data, sizeof vlr);
 689                 break;
 690
 691         case SIOCSIFFLAGS:
 692                 /*
 693                  * We don't support promiscuous mode
 694                  * right now because it would require help from the
 695                  * underlying drivers, which hasn't been implemented.
 696                  */
 697                 if (ifr->ifr_flags & (IFF_PROMISC)) {
 698                         ifp->if_flags &= ~(IFF_PROMISC);
 699                         error = EINVAL;
 700                 }
 701                 break;
 702         case SIOCADDMULTI:
 703         case SIOCDELMULTI:
 704                 error = vlan_setmulti(ifp);
 705                 break;
 706         default:
 707                 error = EINVAL;
 708         }
 709
 710         crit_exit();
 711
 712         return error;
 713 }