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/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 <net/datalink.h>
  32 #include <net/p8022.h>
  33 #include <net/arp.h>
  34
  35 #include "vlan.h"
  36 #include "vlanproc.h"
  37 #include <linux/if_vlan.h>
  38 #include <net/ip.h>
  39
  40 /*
  41  *      Rebuild the Ethernet MAC header. This is called after an ARP
  42  *      (or in future other address resolution) has completed on this
  43  *      sk_buff. We now let ARP fill in the other fields.
  44  *
  45  *      This routine CANNOT use cached dst->neigh!
  46  *      Really, it is used only when dst->neigh is wrong.
  47  *
  48  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  49  */
  50 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  51 {
  52         struct net_device *dev = skb->dev;
  53         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  54
  55         switch (veth->h_vlan_encapsulated_proto) {
  56 #ifdef CONFIG_INET
  57         case __constant_htons(ETH_P_IP):
  58
  59                 /* TODO:  Confirm this will work with VLAN headers... */
  60                 return arp_find(veth->h_dest, skb);
  61 #endif
  62         default:
  63                 pr_debug("%s: unable to resolve type %X addresses.\n",
  64                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  65
  66                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  67                 break;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
  74 {
  75         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
  76                 if (skb_shared(skb) || skb_cloned(skb)) {
  77                         struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
  78                         kfree_skb(skb);
  79                         skb = nskb;
  80                 }
  81                 if (skb) {
  82                         /* Lifted from Gleb's VLAN code... */
  83                         memmove(skb->data - ETH_HLEN,
  84                                 skb->data - VLAN_ETH_HLEN, 12);
  85                         skb->mac_header += VLAN_HLEN;
  86                 }
  87         }
  88
  89         return skb;
  90 }
  91
  92 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  93                 struct vlan_hdr *vhdr)
  94 {
  95         __be16 proto;
  96         unsigned char *rawp;
  97
  98         /*
  99          * Was a VLAN packet, grab the encapsulated protocol, which the layer
 100          * three protocols care about.
 101          */
 102
 103         proto = vhdr->h_vlan_encapsulated_proto;
 104         if (ntohs(proto) >= 1536) {
 105                 skb->protocol = proto;
 106                 return;
 107         }
 108
 109         rawp = skb->data;
 110         if (*(unsigned short *)rawp == 0xFFFF)
 111                 /*
 112                  * This is a magic hack to spot IPX packets. Older Novell
 113                  * breaks the protocol design and runs IPX over 802.3 without
 114                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 115                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 116                  * but does for the rest.
 117                  */
 118                 skb->protocol = htons(ETH_P_802_3);
 119         else
 120                 /*
 121                  * Real 802.2 LLC
 122                  */
 123                 skb->protocol = htons(ETH_P_802_2);
 124 }
 125
 126 /*
 127  *      Determine the packet's protocol ID. The rule here is that we
 128  *      assume 802.3 if the type field is short enough to be a length.
 129  *      This is normal practice and works for any 'now in use' protocol.
 130  *
 131  *  Also, at this point we assume that we ARE dealing exclusively with
 132  *  VLAN packets, or packets that should be made into VLAN packets based
 133  *  on a default VLAN ID.
 134  *
 135  *  NOTE:  Should be similar to ethernet/eth.c.
 136  *
 137  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 138  *                towards userland.  To get here, it would have already passed
 139  *                through the ethernet/eth.c eth_type_trans() method.
 140  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 141  *                 stored UNALIGNED in the memory.  RISC systems don't like
 142  *                 such cases very much...
 143  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 144  *                  aligned, so there doesn't need to be any of the unaligned
 145  *                  stuff.  It has been commented out now...  --Ben
 146  *
 147  */
 148 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 149                   struct packet_type *ptype, struct net_device *orig_dev)
 150 {
 151         struct vlan_hdr *vhdr;
 152         unsigned short vid;
 153         struct net_device_stats *stats;
 154         unsigned short vlan_TCI;
 155
 156         skb = skb_share_check(skb, GFP_ATOMIC);
 157         if (skb == NULL)
 158                 goto err_free;
 159
 160         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 161                 goto err_free;
 162
 163         vhdr = (struct vlan_hdr *)skb->data;
 164         vlan_TCI = ntohs(vhdr->h_vlan_TCI);
 165         vid = (vlan_TCI & VLAN_VID_MASK);
 166
 167         rcu_read_lock();
 168         skb->dev = __find_vlan_dev(dev, vid);
 169         if (!skb->dev) {
 170                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 171                          __func__, (unsigned int)vid, dev->name);
 172                 goto err_unlock;
 173         }
 174
 175         skb->dev->last_rx = jiffies;
 176
 177         stats = &skb->dev->stats;
 178         stats->rx_packets++;
 179         stats->rx_bytes += skb->len;
 180
 181         skb_pull_rcsum(skb, VLAN_HLEN);
 182
 183         skb->priority = vlan_get_ingress_priority(skb->dev,
 184                                                   ntohs(vhdr->h_vlan_TCI));
 185
 186         pr_debug("%s: priority: %u for TCI: %hu\n",
 187                  __func__, skb->priority, ntohs(vhdr->h_vlan_TCI));
 188
 189         switch (skb->pkt_type) {
 190         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 191                 /* stats->broadcast ++; // no such counter :-( */
 192                 break;
 193
 194         case PACKET_MULTICAST:
 195                 stats->multicast++;
 196                 break;
 197
 198         case PACKET_OTHERHOST:
 199                 /* Our lower layer thinks this is not local, let's make sure.
 200                  * This allows the VLAN to have a different MAC than the
 201                  * underlying device, and still route correctly.
 202                  */
 203                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 204                                         skb->dev->dev_addr))
 205                         skb->pkt_type = PACKET_HOST;
 206                 break;
 207         default:
 208                 break;
 209         }
 210
 211         vlan_set_encap_proto(skb, vhdr);
 212
 213         skb = vlan_check_reorder_header(skb);
 214         if (!skb) {
 215                 stats->rx_errors++;
 216                 goto err_unlock;
 217         }
 218
 219         netif_rx(skb);
 220         rcu_read_unlock();
 221         return NET_RX_SUCCESS;
 222
 223 err_unlock:
 224         rcu_read_unlock();
 225 err_free:
 226         kfree_skb(skb);
 227         return NET_RX_DROP;
 228 }
 229
 230 static inline unsigned short
 231 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 232 {
 233         struct vlan_priority_tci_mapping *mp;
 234
 235         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 236         while (mp) {
 237                 if (mp->priority == skb->priority) {
 238                         return mp->vlan_qos; /* This should already be shifted
 239                                               * to mask correctly with the
 240                                               * VLAN's TCI */
 241                 }
 242                 mp = mp->next;
 243         }
 244         return 0;
 245 }
 246
 247 /*
 248  *      Create the VLAN header for an arbitrary protocol layer
 249  *
 250  *      saddr=NULL      means use device source address
 251  *      daddr=NULL      means leave destination address (eg unresolved arp)
 252  *
 253  *  This is called when the SKB is moving down the stack towards the
 254  *  physical devices.
 255  */
 256 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 257                                 unsigned short type,
 258                                 const void *daddr, const void *saddr,
 259                                 unsigned int len)
 260 {
 261         struct vlan_hdr *vhdr;
 262         unsigned short veth_TCI = 0;
 263         int rc = 0;
 264         int build_vlan_header = 0;
 265         struct net_device *vdev = dev;
 266
 267         pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
 268                  __func__, skb, type, len, vlan_dev_info(dev)->vlan_id,
 269                  daddr);
 270
 271         /* build vlan header only if re_order_header flag is NOT set.  This
 272          * fixes some programs that get confused when they see a VLAN device
 273          * sending a frame that is VLAN encoded (the consensus is that the VLAN
 274          * device should look completely like an Ethernet device when the
 275          * REORDER_HEADER flag is set)  The drawback to this is some extra
 276          * header shuffling in the hard_start_xmit.  Users can turn off this
 277          * REORDER behaviour with the vconfig tool.
 278          */
 279         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
 280                 build_vlan_header = 1;
 281
 282         if (build_vlan_header) {
 283                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 284
 285                 /* build the four bytes that make this a VLAN header. */
 286
 287                 /* Now, construct the second two bytes. This field looks
 288                  * something like:
 289                  * usr_priority: 3 bits  (high bits)
 290                  * CFI           1 bit
 291                  * VLAN ID       12 bits (low bits)
 292                  *
 293                  */
 294                 veth_TCI = vlan_dev_info(dev)->vlan_id;
 295                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 296
 297                 vhdr->h_vlan_TCI = htons(veth_TCI);
 298
 299                 /*
 300                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
 301                  *  put the length in here instead. It is up to the 802.2
 302                  *  layer to carry protocol information.
 303                  */
 304
 305                 if (type != ETH_P_802_3)
 306                         vhdr->h_vlan_encapsulated_proto = htons(type);
 307                 else
 308                         vhdr->h_vlan_encapsulated_proto = htons(len);
 309
 310                 skb->protocol = htons(ETH_P_8021Q);
 311                 skb_reset_network_header(skb);
 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_set_vlan_flag(const struct net_device *dev,
 511                            u32 flag, short flag_val)
 512 {
 513         /* verify flag is supported */
 514         if (flag == VLAN_FLAG_REORDER_HDR) {
 515                 if (flag_val)
 516                         vlan_dev_info(dev)->flags |= VLAN_FLAG_REORDER_HDR;
 517                 else
 518                         vlan_dev_info(dev)->flags &= ~VLAN_FLAG_REORDER_HDR;
 519                 return 0;
 520         }
 521         return -EINVAL;
 522 }
 523
 524 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 525 {
 526         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 527 }
 528
 529 void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result)
 530 {
 531         *result = vlan_dev_info(dev)->vlan_id;
 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         return 0;
 556 }
 557
 558 static int vlan_dev_stop(struct net_device *dev)
 559 {
 560         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 561
 562         dev_mc_unsync(real_dev, dev);
 563         dev_unicast_unsync(real_dev, dev);
 564         if (dev->flags & IFF_ALLMULTI)
 565                 dev_set_allmulti(real_dev, -1);
 566         if (dev->flags & IFF_PROMISC)
 567                 dev_set_promiscuity(real_dev, -1);
 568
 569         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 570                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
 571
 572         return 0;
 573 }
 574
 575 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 576 {
 577         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 578         struct sockaddr *addr = p;
 579         int err;
 580
 581         if (!is_valid_ether_addr(addr->sa_data))
 582                 return -EADDRNOTAVAIL;
 583
 584         if (!(dev->flags & IFF_UP))
 585                 goto out;
 586
 587         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 588                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
 589                 if (err < 0)
 590                         return err;
 591         }
 592
 593         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 594                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
 595
 596 out:
 597         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 598         return 0;
 599 }
 600
 601 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 602 {
 603         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 604         struct ifreq ifrr;
 605         int err = -EOPNOTSUPP;
 606
 607         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 608         ifrr.ifr_ifru = ifr->ifr_ifru;
 609
 610         switch (cmd) {
 611         case SIOCGMIIPHY:
 612         case SIOCGMIIREG:
 613         case SIOCSMIIREG:
 614                 if (real_dev->do_ioctl && netif_device_present(real_dev))
 615                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
 616                 break;
 617         }
 618
 619         if (!err)
 620                 ifr->ifr_ifru = ifrr.ifr_ifru;
 621
 622         return err;
 623 }
 624
 625 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 626 {
 627         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 628
 629         if (change & IFF_ALLMULTI)
 630                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 631         if (change & IFF_PROMISC)
 632                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 633 }
 634
 635 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 636 {
 637         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 638         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 639 }
 640
 641 /*
 642  * vlan network devices have devices nesting below it, and are a special
 643  * "super class" of normal network devices; split their locks off into a
 644  * separate class since they always nest.
 645  */
 646 static struct lock_class_key vlan_netdev_xmit_lock_key;
 647
 648 static const struct header_ops vlan_header_ops = {
 649         .create  = vlan_dev_hard_header,
 650         .rebuild = vlan_dev_rebuild_header,
 651         .parse   = eth_header_parse,
 652 };
 653
 654 static int vlan_dev_init(struct net_device *dev)
 655 {
 656         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 657         int subclass = 0;
 658
 659         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 660         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 661         dev->iflink = real_dev->ifindex;
 662         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 663                                           (1<<__LINK_STATE_DORMANT))) |
 664                       (1<<__LINK_STATE_PRESENT);
 665
 666         dev->features |= real_dev->features & real_dev->vlan_features;
 667
 668         /* ipv6 shared card related stuff */
 669         dev->dev_id = real_dev->dev_id;
 670
 671         if (is_zero_ether_addr(dev->dev_addr))
 672                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 673         if (is_zero_ether_addr(dev->broadcast))
 674                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 675
 676         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 677                 dev->header_ops      = real_dev->header_ops;
 678                 dev->hard_header_len = real_dev->hard_header_len;
 679                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 680         } else {
 681                 dev->header_ops      = &vlan_header_ops;
 682                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 683                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 684         }
 685
 686         if (real_dev->priv_flags & IFF_802_1Q_VLAN)
 687                 subclass = 1;
 688
 689         lockdep_set_class_and_subclass(&dev->_xmit_lock,
 690                                 &vlan_netdev_xmit_lock_key, subclass);
 691         return 0;
 692 }
 693
 694 static void vlan_dev_uninit(struct net_device *dev)
 695 {
 696         struct vlan_priority_tci_mapping *pm;
 697         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 698         int i;
 699
 700         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 701                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 702                         vlan->egress_priority_map[i] = pm->next;
 703                         kfree(pm);
 704                 }
 705         }
 706 }
 707
 708 void vlan_setup(struct net_device *dev)
 709 {
 710         ether_setup(dev);
 711
 712         dev->priv_flags         |= IFF_802_1Q_VLAN;
 713         dev->tx_queue_len       = 0;
 714
 715         dev->change_mtu         = vlan_dev_change_mtu;
 716         dev->init               = vlan_dev_init;
 717         dev->uninit             = vlan_dev_uninit;
 718         dev->open               = vlan_dev_open;
 719         dev->stop               = vlan_dev_stop;
 720         dev->set_mac_address    = vlan_dev_set_mac_address;
 721         dev->set_rx_mode        = vlan_dev_set_rx_mode;
 722         dev->set_multicast_list = vlan_dev_set_rx_mode;
 723         dev->change_rx_flags    = vlan_dev_change_rx_flags;
 724         dev->do_ioctl           = vlan_dev_ioctl;
 725         dev->destructor         = free_netdev;
 726
 727         memset(dev->broadcast, 0, ETH_ALEN);
 728 }