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 <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_cow(skb, skb_headroom(skb)) < 0)
  78                         skb = NULL;
  79                 if (skb) {
  80                         /* Lifted from Gleb's VLAN code... */
  81                         memmove(skb->data - ETH_HLEN,
  82                                 skb->data - VLAN_ETH_HLEN, 12);
  83                         skb->mac_header += VLAN_HLEN;
  84                 }
  85         }
  86
  87         return skb;
  88 }
  89
  90 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  91                 struct vlan_hdr *vhdr)
  92 {
  93         __be16 proto;
  94         unsigned char *rawp;
  95
  96         /*
  97          * Was a VLAN packet, grab the encapsulated protocol, which the layer
  98          * three protocols care about.
  99          */
 100
 101         proto = vhdr->h_vlan_encapsulated_proto;
 102         if (ntohs(proto) >= 1536) {
 103                 skb->protocol = proto;
 104                 return;
 105         }
 106
 107         rawp = skb->data;
 108         if (*(unsigned short *)rawp == 0xFFFF)
 109                 /*
 110                  * This is a magic hack to spot IPX packets. Older Novell
 111                  * breaks the protocol design and runs IPX over 802.3 without
 112                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 113                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 114                  * but does for the rest.
 115                  */
 116                 skb->protocol = htons(ETH_P_802_3);
 117         else
 118                 /*
 119                  * Real 802.2 LLC
 120                  */
 121                 skb->protocol = htons(ETH_P_802_2);
 122 }
 123
 124 /*
 125  *      Determine the packet's protocol ID. The rule here is that we
 126  *      assume 802.3 if the type field is short enough to be a length.
 127  *      This is normal practice and works for any 'now in use' protocol.
 128  *
 129  *  Also, at this point we assume that we ARE dealing exclusively with
 130  *  VLAN packets, or packets that should be made into VLAN packets based
 131  *  on a default VLAN ID.
 132  *
 133  *  NOTE:  Should be similar to ethernet/eth.c.
 134  *
 135  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 136  *                towards userland.  To get here, it would have already passed
 137  *                through the ethernet/eth.c eth_type_trans() method.
 138  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 139  *                 stored UNALIGNED in the memory.  RISC systems don't like
 140  *                 such cases very much...
 141  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 142  *                  aligned, so there doesn't need to be any of the unaligned
 143  *                  stuff.  It has been commented out now...  --Ben
 144  *
 145  */
 146 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 147                   struct packet_type *ptype, struct net_device *orig_dev)
 148 {
 149         struct vlan_hdr *vhdr;
 150         struct net_device_stats *stats;
 151         u16 vlan_id;
 152         u16 vlan_tci;
 153
 154         skb = skb_share_check(skb, GFP_ATOMIC);
 155         if (skb == NULL)
 156                 goto err_free;
 157
 158         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 159                 goto err_free;
 160
 161         vhdr = (struct vlan_hdr *)skb->data;
 162         vlan_tci = ntohs(vhdr->h_vlan_TCI);
 163         vlan_id = vlan_tci & VLAN_VID_MASK;
 164
 165         rcu_read_lock();
 166         skb->dev = __find_vlan_dev(dev, vlan_id);
 167         if (!skb->dev) {
 168                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 169                          __func__, vlan_id, dev->name);
 170                 goto err_unlock;
 171         }
 172
 173         skb->dev->last_rx = jiffies;
 174
 175         stats = &skb->dev->stats;
 176         stats->rx_packets++;
 177         stats->rx_bytes += skb->len;
 178
 179         skb_pull_rcsum(skb, VLAN_HLEN);
 180
 181         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 182
 183         pr_debug("%s: priority: %u for TCI: %hu\n",
 184                  __func__, skb->priority, vlan_tci);
 185
 186         switch (skb->pkt_type) {
 187         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 188                 /* stats->broadcast ++; // no such counter :-( */
 189                 break;
 190
 191         case PACKET_MULTICAST:
 192                 stats->multicast++;
 193                 break;
 194
 195         case PACKET_OTHERHOST:
 196                 /* Our lower layer thinks this is not local, let's make sure.
 197                  * This allows the VLAN to have a different MAC than the
 198                  * underlying device, and still route correctly.
 199                  */
 200                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 201                                         skb->dev->dev_addr))
 202                         skb->pkt_type = PACKET_HOST;
 203                 break;
 204         default:
 205                 break;
 206         }
 207
 208         vlan_set_encap_proto(skb, vhdr);
 209
 210         skb = vlan_check_reorder_header(skb);
 211         if (!skb) {
 212                 stats->rx_errors++;
 213                 goto err_unlock;
 214         }
 215
 216         netif_rx(skb);
 217         rcu_read_unlock();
 218         return NET_RX_SUCCESS;
 219
 220 err_unlock:
 221         rcu_read_unlock();
 222 err_free:
 223         kfree_skb(skb);
 224         return NET_RX_DROP;
 225 }
 226
 227 static inline u16
 228 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 229 {
 230         struct vlan_priority_tci_mapping *mp;
 231
 232         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 233         while (mp) {
 234                 if (mp->priority == skb->priority) {
 235                         return mp->vlan_qos; /* This should already be shifted
 236                                               * to mask correctly with the
 237                                               * VLAN's TCI */
 238                 }
 239                 mp = mp->next;
 240         }
 241         return 0;
 242 }
 243
 244 /*
 245  *      Create the VLAN header for an arbitrary protocol layer
 246  *
 247  *      saddr=NULL      means use device source address
 248  *      daddr=NULL      means leave destination address (eg unresolved arp)
 249  *
 250  *  This is called when the SKB is moving down the stack towards the
 251  *  physical devices.
 252  */
 253 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 254                                 unsigned short type,
 255                                 const void *daddr, const void *saddr,
 256                                 unsigned int len)
 257 {
 258         struct vlan_hdr *vhdr;
 259         u16 vlan_tci = 0;
 260         int rc = 0;
 261         int build_vlan_header = 0;
 262
 263         pr_debug("%s: skb: %p type: %hx len: %u vlan_id: %hx, daddr: %p\n",
 264                  __func__, skb, type, len, vlan_dev_info(dev)->vlan_id,
 265                  daddr);
 266
 267         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 268                 return -ENOSPC;
 269
 270         /* build vlan header only if re_order_header flag is NOT set.  This
 271          * fixes some programs that get confused when they see a VLAN device
 272          * sending a frame that is VLAN encoded (the consensus is that the VLAN
 273          * device should look completely like an Ethernet device when the
 274          * REORDER_HEADER flag is set)  The drawback to this is some extra
 275          * header shuffling in the hard_start_xmit.  Users can turn off this
 276          * REORDER behaviour with the vconfig tool.
 277          */
 278         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR))
 279                 build_vlan_header = 1;
 280
 281         if (build_vlan_header) {
 282                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 283
 284                 /* build the four bytes that make this a VLAN header. */
 285
 286                 /* Now, construct the second two bytes. This field looks
 287                  * something like:
 288                  * usr_priority: 3 bits  (high bits)
 289                  * CFI           1 bit
 290                  * VLAN ID       12 bits (low bits)
 291                  *
 292                  */
 293                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 294                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 295
 296                 vhdr->h_vlan_TCI = htons(vlan_tci);
 297
 298                 /*
 299                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
 300                  *  put the length in here instead. It is up to the 802.2
 301                  *  layer to carry protocol information.
 302                  */
 303
 304                 if (type != ETH_P_802_3)
 305                         vhdr->h_vlan_encapsulated_proto = htons(type);
 306                 else
 307                         vhdr->h_vlan_encapsulated_proto = htons(len);
 308
 309                 skb->protocol = htons(ETH_P_8021Q);
 310         }
 311
 312         /* Before delegating work to the lower layer, enter our MAC-address */
 313         if (saddr == NULL)
 314                 saddr = dev->dev_addr;
 315
 316         dev = vlan_dev_info(dev)->real_dev;
 317
 318         if (build_vlan_header) {
 319                 /* Now make the underlying real hard header */
 320                 rc = dev_hard_header(skb, dev, ETH_P_8021Q, daddr, saddr,
 321                                      len + VLAN_HLEN);
 322                 if (rc > 0)
 323                         rc += VLAN_HLEN;
 324                 else if (rc < 0)
 325                         rc -= VLAN_HLEN;
 326         } else
 327                 /* If here, then we'll just make a normal looking ethernet
 328                  * frame, but, the hard_start_xmit method will insert the tag
 329                  * (it has to be able to do this for bridged and other skbs
 330                  * that don't come down the protocol stack in an orderly manner.
 331                  */
 332                 rc = dev_hard_header(skb, dev, type, daddr, saddr, len);
 333
 334         return rc;
 335 }
 336
 337 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 338 {
 339         struct net_device_stats *stats = &dev->stats;
 340         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 341
 342         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 343          *
 344          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 345          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 346          */
 347
 348         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 349                 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 350                 int orig_headroom = skb_headroom(skb);
 351                 u16 vlan_tci;
 352
 353                 /* This is not a VLAN frame...but we can fix that! */
 354                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 355
 356                 pr_debug("%s: proto to encap: 0x%hx\n",
 357                          __func__, ntohs(veth->h_vlan_proto));
 358                 /* Construct the second two bytes. This field looks something
 359                  * like:
 360                  * usr_priority: 3 bits  (high bits)
 361                  * CFI           1 bit
 362                  * VLAN ID       12 bits (low bits)
 363                  */
 364                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 365                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 366
 367                 skb = __vlan_put_tag(skb, vlan_tci);
 368                 if (!skb) {
 369                         stats->tx_dropped++;
 370                         return 0;
 371                 }
 372
 373                 if (orig_headroom < VLAN_HLEN)
 374                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 375         }
 376
 377         pr_debug("%s: about to send skb: %p to dev: %s\n",
 378                 __func__, skb, skb->dev->name);
 379         pr_debug("  " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
 380                  veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
 381                  veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
 382                  veth->h_source[0], veth->h_source[1], veth->h_source[2],
 383                  veth->h_source[3], veth->h_source[4], veth->h_source[5],
 384                  veth->h_vlan_proto, veth->h_vlan_TCI,
 385                  veth->h_vlan_encapsulated_proto);
 386
 387         stats->tx_packets++; /* for statics only */
 388         stats->tx_bytes += skb->len;
 389
 390         skb->dev = vlan_dev_info(dev)->real_dev;
 391         dev_queue_xmit(skb);
 392
 393         return 0;
 394 }
 395
 396 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 397                                             struct net_device *dev)
 398 {
 399         struct net_device_stats *stats = &dev->stats;
 400         u16 vlan_tci;
 401
 402         /* Construct the second two bytes. This field looks something
 403          * like:
 404          * usr_priority: 3 bits  (high bits)
 405          * CFI           1 bit
 406          * VLAN ID       12 bits (low bits)
 407          */
 408         vlan_tci = vlan_dev_info(dev)->vlan_id;
 409         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 410         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 411
 412         stats->tx_packets++;
 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_change_mtu(struct net_device *dev, int new_mtu)
 422 {
 423         /* TODO: gotta make sure the underlying layer can handle it,
 424          * maybe an IFF_VLAN_CAPABLE flag for devices?
 425          */
 426         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 427                 return -ERANGE;
 428
 429         dev->mtu = new_mtu;
 430
 431         return 0;
 432 }
 433
 434 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 435                                    u32 skb_prio, u16 vlan_prio)
 436 {
 437         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 438
 439         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 440                 vlan->nr_ingress_mappings--;
 441         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 442                 vlan->nr_ingress_mappings++;
 443
 444         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 445 }
 446
 447 int vlan_dev_set_egress_priority(const struct net_device *dev,
 448                                  u32 skb_prio, u16 vlan_prio)
 449 {
 450         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 451         struct vlan_priority_tci_mapping *mp = NULL;
 452         struct vlan_priority_tci_mapping *np;
 453         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
 454
 455         /* See if a priority mapping exists.. */
 456         mp = vlan->egress_priority_map[skb_prio & 0xF];
 457         while (mp) {
 458                 if (mp->priority == skb_prio) {
 459                         if (mp->vlan_qos && !vlan_qos)
 460                                 vlan->nr_egress_mappings--;
 461                         else if (!mp->vlan_qos && vlan_qos)
 462                                 vlan->nr_egress_mappings++;
 463                         mp->vlan_qos = vlan_qos;
 464                         return 0;
 465                 }
 466                 mp = mp->next;
 467         }
 468
 469         /* Create a new mapping then. */
 470         mp = vlan->egress_priority_map[skb_prio & 0xF];
 471         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 472         if (!np)
 473                 return -ENOBUFS;
 474
 475         np->next = mp;
 476         np->priority = skb_prio;
 477         np->vlan_qos = vlan_qos;
 478         vlan->egress_priority_map[skb_prio & 0xF] = np;
 479         if (vlan_qos)
 480                 vlan->nr_egress_mappings++;
 481         return 0;
 482 }
 483
 484 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 485 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 486 {
 487         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 488         u32 old_flags = vlan->flags;
 489
 490         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
 491                 return -EINVAL;
 492
 493         vlan->flags = (old_flags & ~mask) | (flags & mask);
 494
 495         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 496                 if (vlan->flags & VLAN_FLAG_GVRP)
 497                         vlan_gvrp_request_join(dev);
 498                 else
 499                         vlan_gvrp_request_leave(dev);
 500         }
 501         return 0;
 502 }
 503
 504 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 505 {
 506         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 507 }
 508
 509 static int vlan_dev_open(struct net_device *dev)
 510 {
 511         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 512         struct net_device *real_dev = vlan->real_dev;
 513         int err;
 514
 515         if (!(real_dev->flags & IFF_UP))
 516                 return -ENETDOWN;
 517
 518         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 519                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
 520                 if (err < 0)
 521                         return err;
 522         }
 523         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 524
 525         if (dev->flags & IFF_ALLMULTI)
 526                 dev_set_allmulti(real_dev, 1);
 527         if (dev->flags & IFF_PROMISC)
 528                 dev_set_promiscuity(real_dev, 1);
 529
 530         if (vlan->flags & VLAN_FLAG_GVRP)
 531                 vlan_gvrp_request_join(dev);
 532
 533         return 0;
 534 }
 535
 536 static int vlan_dev_stop(struct net_device *dev)
 537 {
 538         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 539         struct net_device *real_dev = vlan->real_dev;
 540
 541         if (vlan->flags & VLAN_FLAG_GVRP)
 542                 vlan_gvrp_request_leave(dev);
 543
 544         dev_mc_unsync(real_dev, dev);
 545         dev_unicast_unsync(real_dev, dev);
 546         if (dev->flags & IFF_ALLMULTI)
 547                 dev_set_allmulti(real_dev, -1);
 548         if (dev->flags & IFF_PROMISC)
 549                 dev_set_promiscuity(real_dev, -1);
 550
 551         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 552                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
 553
 554         return 0;
 555 }
 556
 557 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 558 {
 559         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 560         struct sockaddr *addr = p;
 561         int err;
 562
 563         if (!is_valid_ether_addr(addr->sa_data))
 564                 return -EADDRNOTAVAIL;
 565
 566         if (!(dev->flags & IFF_UP))
 567                 goto out;
 568
 569         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 570                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
 571                 if (err < 0)
 572                         return err;
 573         }
 574
 575         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 576                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
 577
 578 out:
 579         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 580         return 0;
 581 }
 582
 583 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 584 {
 585         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 586         struct ifreq ifrr;
 587         int err = -EOPNOTSUPP;
 588
 589         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 590         ifrr.ifr_ifru = ifr->ifr_ifru;
 591
 592         switch (cmd) {
 593         case SIOCGMIIPHY:
 594         case SIOCGMIIREG:
 595         case SIOCSMIIREG:
 596                 if (real_dev->do_ioctl && netif_device_present(real_dev))
 597                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
 598                 break;
 599         }
 600
 601         if (!err)
 602                 ifr->ifr_ifru = ifrr.ifr_ifru;
 603
 604         return err;
 605 }
 606
 607 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 608 {
 609         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 610
 611         if (change & IFF_ALLMULTI)
 612                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 613         if (change & IFF_PROMISC)
 614                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 615 }
 616
 617 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 618 {
 619         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 620         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 621 }
 622
 623 /*
 624  * vlan network devices have devices nesting below it, and are a special
 625  * "super class" of normal network devices; split their locks off into a
 626  * separate class since they always nest.
 627  */
 628 static struct lock_class_key vlan_netdev_xmit_lock_key;
 629
 630 static void vlan_dev_set_lockdep_one(struct netdev_queue *txq,
 631                                      int subclass)
 632 {
 633         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 634                                        &vlan_netdev_xmit_lock_key, subclass);
 635 }
 636
 637 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 638 {
 639         vlan_dev_set_lockdep_one(&dev->tx_queue, subclass);
 640 }
 641
 642 static const struct header_ops vlan_header_ops = {
 643         .create  = vlan_dev_hard_header,
 644         .rebuild = vlan_dev_rebuild_header,
 645         .parse   = eth_header_parse,
 646 };
 647
 648 static int vlan_dev_init(struct net_device *dev)
 649 {
 650         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 651         int subclass = 0;
 652
 653         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 654         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 655         dev->iflink = real_dev->ifindex;
 656         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 657                                           (1<<__LINK_STATE_DORMANT))) |
 658                       (1<<__LINK_STATE_PRESENT);
 659
 660         dev->features |= real_dev->features & real_dev->vlan_features;
 661
 662         /* ipv6 shared card related stuff */
 663         dev->dev_id = real_dev->dev_id;
 664
 665         if (is_zero_ether_addr(dev->dev_addr))
 666                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 667         if (is_zero_ether_addr(dev->broadcast))
 668                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 669
 670         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 671                 dev->header_ops      = real_dev->header_ops;
 672                 dev->hard_header_len = real_dev->hard_header_len;
 673                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 674         } else {
 675                 dev->header_ops      = &vlan_header_ops;
 676                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 677                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 678         }
 679
 680         if (is_vlan_dev(real_dev))
 681                 subclass = 1;
 682
 683         vlan_dev_set_lockdep_class(dev, subclass);
 684         return 0;
 685 }
 686
 687 static void vlan_dev_uninit(struct net_device *dev)
 688 {
 689         struct vlan_priority_tci_mapping *pm;
 690         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 691         int i;
 692
 693         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 694                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 695                         vlan->egress_priority_map[i] = pm->next;
 696                         kfree(pm);
 697                 }
 698         }
 699 }
 700
 701 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 702 {
 703         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 704         struct net_device *real_dev = vlan->real_dev;
 705
 706         if (real_dev->ethtool_ops == NULL ||
 707             real_dev->ethtool_ops->get_rx_csum == NULL)
 708                 return 0;
 709         return real_dev->ethtool_ops->get_rx_csum(real_dev);
 710 }
 711
 712 static const struct ethtool_ops vlan_ethtool_ops = {
 713         .get_link               = ethtool_op_get_link,
 714         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 715 };
 716
 717 void vlan_setup(struct net_device *dev)
 718 {
 719         ether_setup(dev);
 720
 721         dev->priv_flags         |= IFF_802_1Q_VLAN;
 722         dev->tx_queue_len       = 0;
 723
 724         dev->change_mtu         = vlan_dev_change_mtu;
 725         dev->init               = vlan_dev_init;
 726         dev->uninit             = vlan_dev_uninit;
 727         dev->open               = vlan_dev_open;
 728         dev->stop               = vlan_dev_stop;
 729         dev->set_mac_address    = vlan_dev_set_mac_address;
 730         dev->set_rx_mode        = vlan_dev_set_rx_mode;
 731         dev->set_multicast_list = vlan_dev_set_rx_mode;
 732         dev->change_rx_flags    = vlan_dev_change_rx_flags;
 733         dev->do_ioctl           = vlan_dev_ioctl;
 734         dev->destructor         = free_netdev;
 735         dev->ethtool_ops        = &vlan_ethtool_ops;
 736
 737         memset(dev->broadcast, 0, ETH_ALEN);
 738 }