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   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/mm.h>
  25 #include <linux/in.h>
  26 #include <linux/init.h>
  27 #include <asm/uaccess.h> /* for copy_from_user */
  28 #include <linux/skbuff.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <net/datalink.h>
  33 #include <net/p8022.h>
  34 #include <net/arp.h>
  35
  36 #include "vlan.h"
  37 #include "vlanproc.h"
  38 #include <linux/if_vlan.h>
  39 #include <net/ip.h>
  40
  41 /*
  42  *      Rebuild the Ethernet MAC header. This is called after an ARP
  43  *      (or in future other address resolution) has completed on this
  44  *      sk_buff. We now let ARP fill in the other fields.
  45  *
  46  *      This routine CANNOT use cached dst->neigh!
  47  *      Really, it is used only when dst->neigh is wrong.
  48  *
  49  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  50  */
  51 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  52 {
  53         struct net_device *dev = skb->dev;
  54         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  55
  56         switch (veth->h_vlan_encapsulated_proto) {
  57 #ifdef CONFIG_INET
  58         case __constant_htons(ETH_P_IP):
  59
  60                 /* TODO:  Confirm this will work with VLAN headers... */
  61                 return arp_find(veth->h_dest, skb);
  62 #endif
  63         default:
  64                 pr_debug("%s: unable to resolve type %X addresses.\n",
  65                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  66
  67                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  68                 break;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
  75 {
  76         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
  77                 if (skb_shared(skb) || skb_cloned(skb)) {
  78                         struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
  79                         kfree_skb(skb);
  80                         skb = nskb;
  81                 }
  82                 if (skb) {
  83                         /* Lifted from Gleb's VLAN code... */
  84                         memmove(skb->data - ETH_HLEN,
  85                                 skb->data - VLAN_ETH_HLEN, 12);
  86                         skb->mac_header += VLAN_HLEN;
  87                 }
  88         }
  89
  90         return skb;
  91 }
  92
  93 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  94                 struct vlan_hdr *vhdr)
  95 {
  96         __be16 proto;
  97         unsigned char *rawp;
  98
  99         /*
 100          * Was a VLAN packet, grab the encapsulated protocol, which the layer
 101          * three protocols care about.
 102          */
 103
 104         proto = vhdr->h_vlan_encapsulated_proto;
 105         if (ntohs(proto) >= 1536) {
 106                 skb->protocol = proto;
 107                 return;
 108         }
 109
 110         rawp = skb->data;
 111         if (*(unsigned short *)rawp == 0xFFFF)
 112                 /*
 113                  * This is a magic hack to spot IPX packets. Older Novell
 114                  * breaks the protocol design and runs IPX over 802.3 without
 115                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 116                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 117                  * but does for the rest.
 118                  */
 119                 skb->protocol = htons(ETH_P_802_3);
 120         else
 121                 /*
 122                  * Real 802.2 LLC
 123                  */
 124                 skb->protocol = htons(ETH_P_802_2);
 125 }
 126
 127 /*
 128  *      Determine the packet's protocol ID. The rule here is that we
 129  *      assume 802.3 if the type field is short enough to be a length.
 130  *      This is normal practice and works for any 'now in use' protocol.
 131  *
 132  *  Also, at this point we assume that we ARE dealing exclusively with
 133  *  VLAN packets, or packets that should be made into VLAN packets based
 134  *  on a default VLAN ID.
 135  *
 136  *  NOTE:  Should be similar to ethernet/eth.c.
 137  *
 138  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 139  *                towards userland.  To get here, it would have already passed
 140  *                through the ethernet/eth.c eth_type_trans() method.
 141  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 142  *                 stored UNALIGNED in the memory.  RISC systems don't like
 143  *                 such cases very much...
 144  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 145  *                  aligned, so there doesn't need to be any of the unaligned
 146  *                  stuff.  It has been commented out now...  --Ben
 147  *
 148  */
 149 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 150                   struct packet_type *ptype, struct net_device *orig_dev)
 151 {
 152         struct vlan_hdr *vhdr;
 153         unsigned short vid;
 154         struct net_device_stats *stats;
 155         unsigned short vlan_TCI;
 156
 157         skb = skb_share_check(skb, GFP_ATOMIC);
 158         if (skb == NULL)
 159                 goto err_free;
 160
 161         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 162                 goto err_free;
 163
 164         vhdr = (struct vlan_hdr *)skb->data;
 165         vlan_TCI = ntohs(vhdr->h_vlan_TCI);
 166         vid = (vlan_TCI & VLAN_VID_MASK);
 167
 168         rcu_read_lock();
 169         skb->dev = __find_vlan_dev(dev, vid);
 170         if (!skb->dev) {
 171                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 172                          __func__, (unsigned int)vid, dev->name);
 173                 goto err_unlock;
 174         }
 175
 176         skb->dev->last_rx = jiffies;
 177
 178         stats = &skb->dev->stats;
 179         stats->rx_packets++;
 180         stats->rx_bytes += skb->len;
 181
 182         skb_pull_rcsum(skb, VLAN_HLEN);
 183
 184         skb->priority = vlan_get_ingress_priority(skb->dev,
 185                                                   ntohs(vhdr->h_vlan_TCI));
 186
 187         pr_debug("%s: priority: %u for TCI: %hu\n",
 188                  __func__, skb->priority, ntohs(vhdr->h_vlan_TCI));
 189
 190         switch (skb->pkt_type) {
 191         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 192                 /* stats->broadcast ++; // no such counter :-( */
 193                 break;
 194
 195         case PACKET_MULTICAST:
 196                 stats->multicast++;
 197                 break;
 198
 199         case PACKET_OTHERHOST:
 200                 /* Our lower layer thinks this is not local, let's make sure.
 201                  * This allows the VLAN to have a different MAC than the
 202                  * underlying device, and still route correctly.
 203                  */
 204                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 205                                         skb->dev->dev_addr))
 206                         skb->pkt_type = PACKET_HOST;
 207                 break;
 208         default:
 209                 break;
 210         }
 211
 212         vlan_set_encap_proto(skb, vhdr);
 213
 214         skb = vlan_check_reorder_header(skb);
 215         if (!skb) {
 216                 stats->rx_errors++;
 217                 goto err_unlock;
 218         }
 219
 220         netif_rx(skb);
 221         rcu_read_unlock();
 222         return NET_RX_SUCCESS;
 223
 224 err_unlock:
 225         rcu_read_unlock();
 226 err_free:
 227         kfree_skb(skb);
 228         return NET_RX_DROP;
 229 }
 230
 231 static inline unsigned short
 232 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 233 {
 234         struct vlan_priority_tci_mapping *mp;
 235
 236         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 237         while (mp) {
 238                 if (mp->priority == skb->priority) {
 239                         return mp->vlan_qos; /* This should already be shifted
 240                                               * to mask correctly with the
 241                                               * VLAN's TCI */
 242                 }
 243                 mp = mp->next;
 244         }
 245         return 0;
 246 }
 247
 248 /*
 249  *      Create the VLAN header for an arbitrary protocol layer
 250  *
 251  *      saddr=NULL      means use device source address
 252  *      daddr=NULL      means leave destination address (eg unresolved arp)
 253  *
 254  *  This is called when the SKB is moving down the stack towards the
 255  *  physical devices.
 256  */
 257 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 258                                 unsigned short type,
 259                                 const void *daddr, const void *saddr,
 260                                 unsigned int len)
 261 {
 262         struct vlan_hdr *vhdr;
 263         unsigned short veth_TCI = 0;
 264         int rc = 0;
 265         int build_vlan_header = 0;
 266         struct net_device *vdev = dev;
 267
 268         pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
 269                  __func__, skb, type, len, vlan_dev_info(dev)->vlan_id,
 270                  daddr);
 271
 272         /* build vlan header only if re_order_header flag is NOT set.  This
 273          * fixes some programs that get confused when they see a VLAN device
 274          * sending a frame that is VLAN encoded (the consensus is that the VLAN
 275          * device should look completely like an Ethernet device when the
 276          * REORDER_HEADER flag is set)  The drawback to this is some extra
 277          * header shuffling in the hard_start_xmit.  Users can turn off this
 278          * REORDER behaviour with the vconfig tool.
 279          */
 280         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
 281                 build_vlan_header = 1;
 282
 283         if (build_vlan_header) {
 284                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 285
 286                 /* build the four bytes that make this a VLAN header. */
 287
 288                 /* Now, construct the second two bytes. This field looks
 289                  * something like:
 290                  * usr_priority: 3 bits  (high bits)
 291                  * CFI           1 bit
 292                  * VLAN ID       12 bits (low bits)
 293                  *
 294                  */
 295                 veth_TCI = vlan_dev_info(dev)->vlan_id;
 296                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 297
 298                 vhdr->h_vlan_TCI = htons(veth_TCI);
 299
 300                 /*
 301                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
 302                  *  put the length in here instead. It is up to the 802.2
 303                  *  layer to carry protocol information.
 304                  */
 305
 306                 if (type != ETH_P_802_3)
 307                         vhdr->h_vlan_encapsulated_proto = htons(type);
 308                 else
 309                         vhdr->h_vlan_encapsulated_proto = htons(len);
 310
 311                 skb->protocol = htons(ETH_P_8021Q);
 312         }
 313
 314         /* Before delegating work to the lower layer, enter our MAC-address */
 315         if (saddr == NULL)
 316                 saddr = dev->dev_addr;
 317
 318         dev = vlan_dev_info(dev)->real_dev;
 319
 320         /* MPLS can send us skbuffs w/out enough space. This check will grow
 321          * the skb if it doesn't have enough headroom. Not a beautiful solution,
 322          * so I'll tick a counter so that users can know it's happening...
 323          * If they care...
 324          */
 325
 326         /* NOTE: This may still break if the underlying device is not the final
 327          * device (and thus there are more headers to add...) It should work for
 328          * good-ole-ethernet though.
 329          */
 330         if (skb_headroom(skb) < dev->hard_header_len) {
 331                 struct sk_buff *sk_tmp = skb;
 332                 skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
 333                 kfree_skb(sk_tmp);
 334                 if (skb == NULL) {
 335                         struct net_device_stats *stats = &vdev->stats;
 336                         stats->tx_dropped++;
 337                         return -ENOMEM;
 338                 }
 339                 vlan_dev_info(vdev)->cnt_inc_headroom_on_tx++;
 340                 pr_debug("%s: %s: had to grow skb\n", __func__, vdev->name);
 341         }
 342
 343         if (build_vlan_header) {
 344                 /* Now make the underlying real hard header */
 345                 rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,
 346                                      len + VLAN_HLEN);
 347                 if (rc > 0)
 348                         rc += VLAN_HLEN;
 349                 else if (rc < 0)
 350                         rc -= VLAN_HLEN;
 351         } else
 352                 /* If here, then we'll just make a normal looking ethernet
 353                  * frame, but, the hard_start_xmit method will insert the tag
 354                  * (it has to be able to do this for bridged and other skbs
 355                  * that don't come down the protocol stack in an orderly manner.
 356                  */
 357                 rc = dev_hard_header(skb, dev, type, daddr, saddr, len);
 358
 359         return rc;
 360 }
 361
 362 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 363 {
 364         struct net_device_stats *stats = &dev->stats;
 365         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 366
 367         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 368          *
 369          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 370          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 371          */
 372
 373         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 374                 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 375                 int orig_headroom = skb_headroom(skb);
 376                 unsigned short veth_TCI;
 377
 378                 /* This is not a VLAN frame...but we can fix that! */
 379                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 380
 381                 pr_debug("%s: proto to encap: 0x%hx\n",
 382                          __func__, ntohs(veth->h_vlan_proto));
 383                 /* Construct the second two bytes. This field looks something
 384                  * like:
 385                  * usr_priority: 3 bits  (high bits)
 386                  * CFI           1 bit
 387                  * VLAN ID       12 bits (low bits)
 388                  */
 389                 veth_TCI = vlan_dev_info(dev)->vlan_id;
 390                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 391
 392                 skb = __vlan_put_tag(skb, veth_TCI);
 393                 if (!skb) {
 394                         stats->tx_dropped++;
 395                         return 0;
 396                 }
 397
 398                 if (orig_headroom < VLAN_HLEN)
 399                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 400         }
 401
 402         pr_debug("%s: about to send skb: %p to dev: %s\n",
 403                 __func__, skb, skb->dev->name);
 404         pr_debug("  " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
 405                  veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
 406                  veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
 407                  veth->h_source[0], veth->h_source[1], veth->h_source[2],
 408                  veth->h_source[3], veth->h_source[4], veth->h_source[5],
 409                  veth->h_vlan_proto, veth->h_vlan_TCI,
 410                  veth->h_vlan_encapsulated_proto);
 411
 412         stats->tx_packets++; /* for statics only */
 413         stats->tx_bytes += skb->len;
 414
 415         skb->dev = vlan_dev_info(dev)->real_dev;
 416         dev_queue_xmit(skb);
 417
 418         return 0;
 419 }
 420
 421 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 422                                             struct net_device *dev)
 423 {
 424         struct net_device_stats *stats = &dev->stats;
 425         unsigned short veth_TCI;
 426
 427         /* Construct the second two bytes. This field looks something
 428          * like:
 429          * usr_priority: 3 bits  (high bits)
 430          * CFI           1 bit
 431          * VLAN ID       12 bits (low bits)
 432          */
 433         veth_TCI = vlan_dev_info(dev)->vlan_id;
 434         veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 435         skb = __vlan_hwaccel_put_tag(skb, veth_TCI);
 436
 437         stats->tx_packets++;
 438         stats->tx_bytes += skb->len;
 439
 440         skb->dev = vlan_dev_info(dev)->real_dev;
 441         dev_queue_xmit(skb);
 442
 443         return 0;
 444 }
 445
 446 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 447 {
 448         /* TODO: gotta make sure the underlying layer can handle it,
 449          * maybe an IFF_VLAN_CAPABLE flag for devices?
 450          */
 451         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 452                 return -ERANGE;
 453
 454         dev->mtu = new_mtu;
 455
 456         return 0;
 457 }
 458
 459 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 460                                    u32 skb_prio, short vlan_prio)
 461 {
 462         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 463
 464         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 465                 vlan->nr_ingress_mappings--;
 466         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 467                 vlan->nr_ingress_mappings++;
 468
 469         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 470 }
 471
 472 int vlan_dev_set_egress_priority(const struct net_device *dev,
 473                                  u32 skb_prio, short vlan_prio)
 474 {
 475         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 476         struct vlan_priority_tci_mapping *mp = NULL;
 477         struct vlan_priority_tci_mapping *np;
 478         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
 479
 480         /* See if a priority mapping exists.. */
 481         mp = vlan->egress_priority_map[skb_prio & 0xF];
 482         while (mp) {
 483                 if (mp->priority == skb_prio) {
 484                         if (mp->vlan_qos && !vlan_qos)
 485                                 vlan->nr_egress_mappings--;
 486                         else if (!mp->vlan_qos && vlan_qos)
 487                                 vlan->nr_egress_mappings++;
 488                         mp->vlan_qos = vlan_qos;
 489                         return 0;
 490                 }
 491                 mp = mp->next;
 492         }
 493
 494         /* Create a new mapping then. */
 495         mp = vlan->egress_priority_map[skb_prio & 0xF];
 496         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 497         if (!np)
 498                 return -ENOBUFS;
 499
 500         np->next = mp;
 501         np->priority = skb_prio;
 502         np->vlan_qos = vlan_qos;
 503         vlan->egress_priority_map[skb_prio & 0xF] = np;
 504         if (vlan_qos)
 505                 vlan->nr_egress_mappings++;
 506         return 0;
 507 }
 508
 509 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 510 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 511 {
 512         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 513         u32 old_flags = vlan->flags;
 514
 515         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
 516                 return -EINVAL;
 517
 518         vlan->flags = (old_flags & ~mask) | (flags & mask);
 519
 520         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 521                 if (vlan->flags & VLAN_FLAG_GVRP)
 522                         vlan_gvrp_request_join(dev);
 523                 else
 524                         vlan_gvrp_request_leave(dev);
 525         }
 526         return 0;
 527 }
 528
 529 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 530 {
 531         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 532 }
 533
 534 static int vlan_dev_open(struct net_device *dev)
 535 {
 536         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 537         struct net_device *real_dev = vlan->real_dev;
 538         int err;
 539
 540         if (!(real_dev->flags & IFF_UP))
 541                 return -ENETDOWN;
 542
 543         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 544                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
 545                 if (err < 0)
 546                         return err;
 547         }
 548         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 549
 550         if (dev->flags & IFF_ALLMULTI)
 551                 dev_set_allmulti(real_dev, 1);
 552         if (dev->flags & IFF_PROMISC)
 553                 dev_set_promiscuity(real_dev, 1);
 554
 555         if (vlan->flags & VLAN_FLAG_GVRP)
 556                 vlan_gvrp_request_join(dev);
 557
 558         return 0;
 559 }
 560
 561 static int vlan_dev_stop(struct net_device *dev)
 562 {
 563         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 564         struct net_device *real_dev = vlan->real_dev;
 565
 566         if (vlan->flags & VLAN_FLAG_GVRP)
 567                 vlan_gvrp_request_leave(dev);
 568
 569         dev_mc_unsync(real_dev, dev);
 570         dev_unicast_unsync(real_dev, dev);
 571         if (dev->flags & IFF_ALLMULTI)
 572                 dev_set_allmulti(real_dev, -1);
 573         if (dev->flags & IFF_PROMISC)
 574                 dev_set_promiscuity(real_dev, -1);
 575
 576         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 577                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
 578
 579         return 0;
 580 }
 581
 582 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 583 {
 584         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 585         struct sockaddr *addr = p;
 586         int err;
 587
 588         if (!is_valid_ether_addr(addr->sa_data))
 589                 return -EADDRNOTAVAIL;
 590
 591         if (!(dev->flags & IFF_UP))
 592                 goto out;
 593
 594         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 595                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
 596                 if (err < 0)
 597                         return err;
 598         }
 599
 600         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 601                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
 602
 603 out:
 604         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 605         return 0;
 606 }
 607
 608 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 609 {
 610         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 611         struct ifreq ifrr;
 612         int err = -EOPNOTSUPP;
 613
 614         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 615         ifrr.ifr_ifru = ifr->ifr_ifru;
 616
 617         switch (cmd) {
 618         case SIOCGMIIPHY:
 619         case SIOCGMIIREG:
 620         case SIOCSMIIREG:
 621                 if (real_dev->do_ioctl && netif_device_present(real_dev))
 622                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
 623                 break;
 624         }
 625
 626         if (!err)
 627                 ifr->ifr_ifru = ifrr.ifr_ifru;
 628
 629         return err;
 630 }
 631
 632 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 633 {
 634         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 635
 636         if (change & IFF_ALLMULTI)
 637                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 638         if (change & IFF_PROMISC)
 639                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 640 }
 641
 642 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 643 {
 644         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 645         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 646 }
 647
 648 /*
 649  * vlan network devices have devices nesting below it, and are a special
 650  * "super class" of normal network devices; split their locks off into a
 651  * separate class since they always nest.
 652  */
 653 static struct lock_class_key vlan_netdev_xmit_lock_key;
 654
 655 static const struct header_ops vlan_header_ops = {
 656         .create  = vlan_dev_hard_header,
 657         .rebuild = vlan_dev_rebuild_header,
 658         .parse   = eth_header_parse,
 659 };
 660
 661 static int vlan_dev_init(struct net_device *dev)
 662 {
 663         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 664         int subclass = 0;
 665
 666         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 667         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 668         dev->iflink = real_dev->ifindex;
 669         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 670                                           (1<<__LINK_STATE_DORMANT))) |
 671                       (1<<__LINK_STATE_PRESENT);
 672
 673         dev->features |= real_dev->features & real_dev->vlan_features;
 674
 675         /* ipv6 shared card related stuff */
 676         dev->dev_id = real_dev->dev_id;
 677
 678         if (is_zero_ether_addr(dev->dev_addr))
 679                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 680         if (is_zero_ether_addr(dev->broadcast))
 681                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 682
 683         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 684                 dev->header_ops      = real_dev->header_ops;
 685                 dev->hard_header_len = real_dev->hard_header_len;
 686                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 687         } else {
 688                 dev->header_ops      = &vlan_header_ops;
 689                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 690                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 691         }
 692
 693         if (is_vlan_dev(real_dev))
 694                 subclass = 1;
 695
 696         lockdep_set_class_and_subclass(&dev->_xmit_lock,
 697                                 &vlan_netdev_xmit_lock_key, subclass);
 698         return 0;
 699 }
 700
 701 static void vlan_dev_uninit(struct net_device *dev)
 702 {
 703         struct vlan_priority_tci_mapping *pm;
 704         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 705         int i;
 706
 707         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 708                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 709                         vlan->egress_priority_map[i] = pm->next;
 710                         kfree(pm);
 711                 }
 712         }
 713 }
 714
 715 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 716 {
 717         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 718         struct net_device *real_dev = vlan->real_dev;
 719
 720         if (real_dev->ethtool_ops == NULL ||
 721             real_dev->ethtool_ops->get_rx_csum == NULL)
 722                 return 0;
 723         return real_dev->ethtool_ops->get_rx_csum(real_dev);
 724 }
 725
 726 static const struct ethtool_ops vlan_ethtool_ops = {
 727         .get_link               = ethtool_op_get_link,
 728         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 729 };
 730
 731 void vlan_setup(struct net_device *dev)
 732 {
 733         ether_setup(dev);
 734
 735         dev->priv_flags         |= IFF_802_1Q_VLAN;
 736         dev->tx_queue_len       = 0;
 737
 738         dev->change_mtu         = vlan_dev_change_mtu;
 739         dev->init               = vlan_dev_init;
 740         dev->uninit             = vlan_dev_uninit;
 741         dev->open               = vlan_dev_open;
 742         dev->stop               = vlan_dev_stop;
 743         dev->set_mac_address    = vlan_dev_set_mac_address;
 744         dev->set_rx_mode        = vlan_dev_set_rx_mode;
 745         dev->set_multicast_list = vlan_dev_set_rx_mode;
 746         dev->change_rx_flags    = vlan_dev_change_rx_flags;
 747         dev->do_ioctl           = vlan_dev_ioctl;
 748         dev->destructor         = free_netdev;
 749         dev->ethtool_ops        = &vlan_ethtool_ops;
 750
 751         memset(dev->broadcast, 0, ETH_ALEN);
 752 }