git.oblomov.eu Git - linux-2.6/blob - net/8021q/vlan_dev.c

   1 /* -*- linux-c -*-
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
  10  *                - reset skb->pkt_type on incoming packets when MAC was changed
  11  *                - see that changed MAC is saddr for outgoing packets
  12  *              Oct 20, 2001:  Ard van Breeman:
  13  *                - Fix MC-list, finally.
  14  *                - Flush MC-list on VLAN destroy.
  15  *
  16  *
  17  *              This program is free software; you can redistribute it and/or
  18  *              modify it under the terms of the GNU General Public License
  19  *              as published by the Free Software Foundation; either version
  20  *              2 of the License, or (at your option) any later version.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <net/arp.h>
  29
  30 #include "vlan.h"
  31 #include "vlanproc.h"
  32 #include <linux/if_vlan.h>
  33
  34 /*
  35  *      Rebuild the Ethernet MAC header. This is called after an ARP
  36  *      (or in future other address resolution) has completed on this
  37  *      sk_buff. We now let ARP fill in the other fields.
  38  *
  39  *      This routine CANNOT use cached dst->neigh!
  40  *      Really, it is used only when dst->neigh is wrong.
  41  *
  42  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  43  */
  44 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  45 {
  46         struct net_device *dev = skb->dev;
  47         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  48
  49         switch (veth->h_vlan_encapsulated_proto) {
  50 #ifdef CONFIG_INET
  51         case __constant_htons(ETH_P_IP):
  52
  53                 /* TODO:  Confirm this will work with VLAN headers... */
  54                 return arp_find(veth->h_dest, skb);
  55 #endif
  56         default:
  57                 pr_debug("%s: unable to resolve type %X addresses.\n",
  58                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  59
  60                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  61                 break;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
  68 {
  69         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
  70                 if (skb_cow(skb, skb_headroom(skb)) < 0)
  71                         skb = NULL;
  72                 if (skb) {
  73                         /* Lifted from Gleb's VLAN code... */
  74                         memmove(skb->data - ETH_HLEN,
  75                                 skb->data - VLAN_ETH_HLEN, 12);
  76                         skb->mac_header += VLAN_HLEN;
  77                 }
  78         }
  79
  80         return skb;
  81 }
  82
  83 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  84                 struct vlan_hdr *vhdr)
  85 {
  86         __be16 proto;
  87         unsigned char *rawp;
  88
  89         /*
  90          * Was a VLAN packet, grab the encapsulated protocol, which the layer
  91          * three protocols care about.
  92          */
  93
  94         proto = vhdr->h_vlan_encapsulated_proto;
  95         if (ntohs(proto) >= 1536) {
  96                 skb->protocol = proto;
  97                 return;
  98         }
  99
 100         rawp = skb->data;
 101         if (*(unsigned short *)rawp == 0xFFFF)
 102                 /*
 103                  * This is a magic hack to spot IPX packets. Older Novell
 104                  * breaks the protocol design and runs IPX over 802.3 without
 105                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 106                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 107                  * but does for the rest.
 108                  */
 109                 skb->protocol = htons(ETH_P_802_3);
 110         else
 111                 /*
 112                  * Real 802.2 LLC
 113                  */
 114                 skb->protocol = htons(ETH_P_802_2);
 115 }
 116
 117 /*
 118  *      Determine the packet's protocol ID. The rule here is that we
 119  *      assume 802.3 if the type field is short enough to be a length.
 120  *      This is normal practice and works for any 'now in use' protocol.
 121  *
 122  *  Also, at this point we assume that we ARE dealing exclusively with
 123  *  VLAN packets, or packets that should be made into VLAN packets based
 124  *  on a default VLAN ID.
 125  *
 126  *  NOTE:  Should be similar to ethernet/eth.c.
 127  *
 128  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 129  *                towards userland.  To get here, it would have already passed
 130  *                through the ethernet/eth.c eth_type_trans() method.
 131  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 132  *                 stored UNALIGNED in the memory.  RISC systems don't like
 133  *                 such cases very much...
 134  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 135  *                  aligned, so there doesn't need to be any of the unaligned
 136  *                  stuff.  It has been commented out now...  --Ben
 137  *
 138  */
 139 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 140                   struct packet_type *ptype, struct net_device *orig_dev)
 141 {
 142         struct vlan_hdr *vhdr;
 143         struct net_device_stats *stats;
 144         u16 vlan_id;
 145         u16 vlan_tci;
 146
 147         skb = skb_share_check(skb, GFP_ATOMIC);
 148         if (skb == NULL)
 149                 goto err_free;
 150
 151         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 152                 goto err_free;
 153
 154         vhdr = (struct vlan_hdr *)skb->data;
 155         vlan_tci = ntohs(vhdr->h_vlan_TCI);
 156         vlan_id = vlan_tci & VLAN_VID_MASK;
 157
 158         rcu_read_lock();
 159         skb->dev = __find_vlan_dev(dev, vlan_id);
 160         if (!skb->dev) {
 161                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 162                          __func__, vlan_id, dev->name);
 163                 goto err_unlock;
 164         }
 165
 166         skb->dev->last_rx = jiffies;
 167
 168         stats = &skb->dev->stats;
 169         stats->rx_packets++;
 170         stats->rx_bytes += skb->len;
 171
 172         skb_pull_rcsum(skb, VLAN_HLEN);
 173
 174         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 175
 176         pr_debug("%s: priority: %u for TCI: %hu\n",
 177                  __func__, skb->priority, vlan_tci);
 178
 179         switch (skb->pkt_type) {
 180         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 181                 /* stats->broadcast ++; // no such counter :-( */
 182                 break;
 183
 184         case PACKET_MULTICAST:
 185                 stats->multicast++;
 186                 break;
 187
 188         case PACKET_OTHERHOST:
 189                 /* Our lower layer thinks this is not local, let's make sure.
 190                  * This allows the VLAN to have a different MAC than the
 191                  * underlying device, and still route correctly.
 192                  */
 193                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 194                                         skb->dev->dev_addr))
 195                         skb->pkt_type = PACKET_HOST;
 196                 break;
 197         default:
 198                 break;
 199         }
 200
 201         vlan_set_encap_proto(skb, vhdr);
 202
 203         skb = vlan_check_reorder_header(skb);
 204         if (!skb) {
 205                 stats->rx_errors++;
 206                 goto err_unlock;
 207         }
 208
 209         netif_rx(skb);
 210         rcu_read_unlock();
 211         return NET_RX_SUCCESS;
 212
 213 err_unlock:
 214         rcu_read_unlock();
 215 err_free:
 216         kfree_skb(skb);
 217         return NET_RX_DROP;
 218 }
 219
 220 static inline u16
 221 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 222 {
 223         struct vlan_priority_tci_mapping *mp;
 224
 225         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 226         while (mp) {
 227                 if (mp->priority == skb->priority) {
 228                         return mp->vlan_qos; /* This should already be shifted
 229                                               * to mask correctly with the
 230                                               * VLAN's TCI */
 231                 }
 232                 mp = mp->next;
 233         }
 234         return 0;
 235 }
 236
 237 /*
 238  *      Create the VLAN header for an arbitrary protocol layer
 239  *
 240  *      saddr=NULL      means use device source address
 241  *      daddr=NULL      means leave destination address (eg unresolved arp)
 242  *
 243  *  This is called when the SKB is moving down the stack towards the
 244  *  physical devices.
 245  */
 246 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 247                                 unsigned short type,
 248                                 const void *daddr, const void *saddr,
 249                                 unsigned int len)
 250 {
 251         struct vlan_hdr *vhdr;
 252         unsigned int vhdrlen = 0;
 253         u16 vlan_tci = 0;
 254         int rc;
 255
 256         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 257                 return -ENOSPC;
 258
 259         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 260                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 261
 262                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 263                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 264                 vhdr->h_vlan_TCI = htons(vlan_tci);
 265
 266                 /*
 267                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
 268                  *  put the length in here instead. It is up to the 802.2
 269                  *  layer to carry protocol information.
 270                  */
 271                 if (type != ETH_P_802_3)
 272                         vhdr->h_vlan_encapsulated_proto = htons(type);
 273                 else
 274                         vhdr->h_vlan_encapsulated_proto = htons(len);
 275
 276                 skb->protocol = htons(ETH_P_8021Q);
 277                 type = ETH_P_8021Q;
 278                 vhdrlen = VLAN_HLEN;
 279         }
 280
 281         /* Before delegating work to the lower layer, enter our MAC-address */
 282         if (saddr == NULL)
 283                 saddr = dev->dev_addr;
 284
 285         /* Now make the underlying real hard header */
 286         dev = vlan_dev_info(dev)->real_dev;
 287         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 288         if (rc > 0)
 289                 rc += vhdrlen;
 290         return rc;
 291 }
 292
 293 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 294 {
 295         struct net_device_stats *stats = &dev->stats;
 296         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 297
 298         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 299          *
 300          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 301          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 302          */
 303         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 304             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 305                 unsigned int orig_headroom = skb_headroom(skb);
 306                 u16 vlan_tci;
 307
 308                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 309
 310                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 311                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 312                 skb = __vlan_put_tag(skb, vlan_tci);
 313                 if (!skb) {
 314                         stats->tx_dropped++;
 315                         return NETDEV_TX_OK;
 316                 }
 317
 318                 if (orig_headroom < VLAN_HLEN)
 319                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 320         }
 321
 322         stats->tx_packets++;
 323         stats->tx_bytes += skb->len;
 324
 325         skb->dev = vlan_dev_info(dev)->real_dev;
 326         dev_queue_xmit(skb);
 327         return NETDEV_TX_OK;
 328 }
 329
 330 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 331                                             struct net_device *dev)
 332 {
 333         struct net_device_stats *stats = &dev->stats;
 334         u16 vlan_tci;
 335
 336         vlan_tci = vlan_dev_info(dev)->vlan_id;
 337         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 338         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 339
 340         stats->tx_packets++;
 341         stats->tx_bytes += skb->len;
 342
 343         skb->dev = vlan_dev_info(dev)->real_dev;
 344         dev_queue_xmit(skb);
 345         return NETDEV_TX_OK;
 346 }
 347
 348 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 349 {
 350         /* TODO: gotta make sure the underlying layer can handle it,
 351          * maybe an IFF_VLAN_CAPABLE flag for devices?
 352          */
 353         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 354                 return -ERANGE;
 355
 356         dev->mtu = new_mtu;
 357
 358         return 0;
 359 }
 360
 361 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 362                                    u32 skb_prio, u16 vlan_prio)
 363 {
 364         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 365
 366         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 367                 vlan->nr_ingress_mappings--;
 368         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 369                 vlan->nr_ingress_mappings++;
 370
 371         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 372 }
 373
 374 int vlan_dev_set_egress_priority(const struct net_device *dev,
 375                                  u32 skb_prio, u16 vlan_prio)
 376 {
 377         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 378         struct vlan_priority_tci_mapping *mp = NULL;
 379         struct vlan_priority_tci_mapping *np;
 380         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
 381
 382         /* See if a priority mapping exists.. */
 383         mp = vlan->egress_priority_map[skb_prio & 0xF];
 384         while (mp) {
 385                 if (mp->priority == skb_prio) {
 386                         if (mp->vlan_qos && !vlan_qos)
 387                                 vlan->nr_egress_mappings--;
 388                         else if (!mp->vlan_qos && vlan_qos)
 389                                 vlan->nr_egress_mappings++;
 390                         mp->vlan_qos = vlan_qos;
 391                         return 0;
 392                 }
 393                 mp = mp->next;
 394         }
 395
 396         /* Create a new mapping then. */
 397         mp = vlan->egress_priority_map[skb_prio & 0xF];
 398         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 399         if (!np)
 400                 return -ENOBUFS;
 401
 402         np->next = mp;
 403         np->priority = skb_prio;
 404         np->vlan_qos = vlan_qos;
 405         vlan->egress_priority_map[skb_prio & 0xF] = np;
 406         if (vlan_qos)
 407                 vlan->nr_egress_mappings++;
 408         return 0;
 409 }
 410
 411 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 412 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 413 {
 414         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 415         u32 old_flags = vlan->flags;
 416
 417         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
 418                 return -EINVAL;
 419
 420         vlan->flags = (old_flags & ~mask) | (flags & mask);
 421
 422         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 423                 if (vlan->flags & VLAN_FLAG_GVRP)
 424                         vlan_gvrp_request_join(dev);
 425                 else
 426                         vlan_gvrp_request_leave(dev);
 427         }
 428         return 0;
 429 }
 430
 431 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 432 {
 433         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 434 }
 435
 436 static int vlan_dev_open(struct net_device *dev)
 437 {
 438         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 439         struct net_device *real_dev = vlan->real_dev;
 440         int err;
 441
 442         if (!(real_dev->flags & IFF_UP))
 443                 return -ENETDOWN;
 444
 445         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 446                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
 447                 if (err < 0)
 448                         goto out;
 449         }
 450
 451         if (dev->flags & IFF_ALLMULTI) {
 452                 err = dev_set_allmulti(real_dev, 1);
 453                 if (err < 0)
 454                         goto del_unicast;
 455         }
 456         if (dev->flags & IFF_PROMISC) {
 457                 err = dev_set_promiscuity(real_dev, 1);
 458                 if (err < 0)
 459                         goto clear_allmulti;
 460         }
 461
 462         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 463
 464         if (vlan->flags & VLAN_FLAG_GVRP)
 465                 vlan_gvrp_request_join(dev);
 466
 467         return 0;
 468
 469 clear_allmulti:
 470         if (dev->flags & IFF_ALLMULTI)
 471                 dev_set_allmulti(real_dev, -1);
 472 del_unicast:
 473         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 474                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
 475 out:
 476         return err;
 477 }
 478
 479 static int vlan_dev_stop(struct net_device *dev)
 480 {
 481         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 482         struct net_device *real_dev = vlan->real_dev;
 483
 484         if (vlan->flags & VLAN_FLAG_GVRP)
 485                 vlan_gvrp_request_leave(dev);
 486
 487         dev_mc_unsync(real_dev, dev);
 488         dev_unicast_unsync(real_dev, dev);
 489         if (dev->flags & IFF_ALLMULTI)
 490                 dev_set_allmulti(real_dev, -1);
 491         if (dev->flags & IFF_PROMISC)
 492                 dev_set_promiscuity(real_dev, -1);
 493
 494         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 495                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
 496
 497         return 0;
 498 }
 499
 500 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 501 {
 502         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 503         struct sockaddr *addr = p;
 504         int err;
 505
 506         if (!is_valid_ether_addr(addr->sa_data))
 507                 return -EADDRNOTAVAIL;
 508
 509         if (!(dev->flags & IFF_UP))
 510                 goto out;
 511
 512         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 513                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
 514                 if (err < 0)
 515                         return err;
 516         }
 517
 518         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 519                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
 520
 521 out:
 522         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 523         return 0;
 524 }
 525
 526 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 527 {
 528         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 529         struct ifreq ifrr;
 530         int err = -EOPNOTSUPP;
 531
 532         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 533         ifrr.ifr_ifru = ifr->ifr_ifru;
 534
 535         switch (cmd) {
 536         case SIOCGMIIPHY:
 537         case SIOCGMIIREG:
 538         case SIOCSMIIREG:
 539                 if (real_dev->do_ioctl && netif_device_present(real_dev))
 540                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
 541                 break;
 542         }
 543
 544         if (!err)
 545                 ifr->ifr_ifru = ifrr.ifr_ifru;
 546
 547         return err;
 548 }
 549
 550 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 551 {
 552         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 553
 554         if (change & IFF_ALLMULTI)
 555                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 556         if (change & IFF_PROMISC)
 557                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 558 }
 559
 560 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 561 {
 562         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 563         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 564 }
 565
 566 /*
 567  * vlan network devices have devices nesting below it, and are a special
 568  * "super class" of normal network devices; split their locks off into a
 569  * separate class since they always nest.
 570  */
 571 static struct lock_class_key vlan_netdev_xmit_lock_key;
 572 static struct lock_class_key vlan_netdev_addr_lock_key;
 573
 574 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 575                                      struct netdev_queue *txq,
 576                                      void *_subclass)
 577 {
 578         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 579                                        &vlan_netdev_xmit_lock_key,
 580                                        *(int *)_subclass);
 581 }
 582
 583 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 584 {
 585         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 586                                        &vlan_netdev_addr_lock_key,
 587                                        subclass);
 588         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 589 }
 590
 591 static const struct header_ops vlan_header_ops = {
 592         .create  = vlan_dev_hard_header,
 593         .rebuild = vlan_dev_rebuild_header,
 594         .parse   = eth_header_parse,
 595 };
 596
 597 static int vlan_dev_init(struct net_device *dev)
 598 {
 599         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 600         int subclass = 0;
 601
 602         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 603         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 604         dev->iflink = real_dev->ifindex;
 605         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 606                                           (1<<__LINK_STATE_DORMANT))) |
 607                       (1<<__LINK_STATE_PRESENT);
 608
 609         dev->features |= real_dev->features & real_dev->vlan_features;
 610         dev->gso_max_size = real_dev->gso_max_size;
 611
 612         /* ipv6 shared card related stuff */
 613         dev->dev_id = real_dev->dev_id;
 614
 615         if (is_zero_ether_addr(dev->dev_addr))
 616                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 617         if (is_zero_ether_addr(dev->broadcast))
 618                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 619
 620         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 621                 dev->header_ops      = real_dev->header_ops;
 622                 dev->hard_header_len = real_dev->hard_header_len;
 623                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 624         } else {
 625                 dev->header_ops      = &vlan_header_ops;
 626                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 627                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 628         }
 629
 630         if (is_vlan_dev(real_dev))
 631                 subclass = 1;
 632
 633         vlan_dev_set_lockdep_class(dev, subclass);
 634         return 0;
 635 }
 636
 637 static void vlan_dev_uninit(struct net_device *dev)
 638 {
 639         struct vlan_priority_tci_mapping *pm;
 640         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 641         int i;
 642
 643         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 644                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 645                         vlan->egress_priority_map[i] = pm->next;
 646                         kfree(pm);
 647                 }
 648         }
 649 }
 650
 651 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 652 {
 653         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 654         struct net_device *real_dev = vlan->real_dev;
 655
 656         if (real_dev->ethtool_ops == NULL ||
 657             real_dev->ethtool_ops->get_rx_csum == NULL)
 658                 return 0;
 659         return real_dev->ethtool_ops->get_rx_csum(real_dev);
 660 }
 661
 662 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 663 {
 664         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 665         struct net_device *real_dev = vlan->real_dev;
 666
 667         if (!(real_dev->features & NETIF_F_HW_VLAN_RX) ||
 668             real_dev->ethtool_ops == NULL ||
 669             real_dev->ethtool_ops->get_flags == NULL)
 670                 return 0;
 671         return real_dev->ethtool_ops->get_flags(real_dev);
 672 }
 673
 674 static const struct ethtool_ops vlan_ethtool_ops = {
 675         .get_link               = ethtool_op_get_link,
 676         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 677         .get_flags              = vlan_ethtool_get_flags,
 678 };
 679
 680 void vlan_setup(struct net_device *dev)
 681 {
 682         ether_setup(dev);
 683
 684         dev->priv_flags         |= IFF_802_1Q_VLAN;
 685         dev->tx_queue_len       = 0;
 686
 687         dev->change_mtu         = vlan_dev_change_mtu;
 688         dev->init               = vlan_dev_init;
 689         dev->uninit             = vlan_dev_uninit;
 690         dev->open               = vlan_dev_open;
 691         dev->stop               = vlan_dev_stop;
 692         dev->set_mac_address    = vlan_dev_set_mac_address;
 693         dev->set_rx_mode        = vlan_dev_set_rx_mode;
 694         dev->set_multicast_list = vlan_dev_set_rx_mode;
 695         dev->change_rx_flags    = vlan_dev_change_rx_flags;
 696         dev->do_ioctl           = vlan_dev_ioctl;
 697         dev->destructor         = free_netdev;
 698         dev->ethtool_ops        = &vlan_ethtool_ops;
 699
 700         memset(dev->broadcast, 0, ETH_ALEN);
 701 }