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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_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         unsigned int vhdrlen = 0;
 260         u16 vlan_tci = 0;
 261         int rc;
 262
 263         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 264                 return -ENOSPC;
 265
 266         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 267                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 268
 269                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 270                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 271                 vhdr->h_vlan_TCI = htons(vlan_tci);
 272
 273                 /*
 274                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
 275                  *  put the length in here instead. It is up to the 802.2
 276                  *  layer to carry protocol information.
 277                  */
 278                 if (type != ETH_P_802_3)
 279                         vhdr->h_vlan_encapsulated_proto = htons(type);
 280                 else
 281                         vhdr->h_vlan_encapsulated_proto = htons(len);
 282
 283                 skb->protocol = htons(ETH_P_8021Q);
 284                 type = ETH_P_8021Q;
 285                 vhdrlen = VLAN_HLEN;
 286         }
 287
 288         /* Before delegating work to the lower layer, enter our MAC-address */
 289         if (saddr == NULL)
 290                 saddr = dev->dev_addr;
 291
 292         /* Now make the underlying real hard header */
 293         dev = vlan_dev_info(dev)->real_dev;
 294         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 295         if (rc > 0)
 296                 rc += vhdrlen;
 297         return rc;
 298 }
 299
 300 static int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 301 {
 302         struct net_device_stats *stats = &dev->stats;
 303         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 304
 305         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 306          *
 307          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 308          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 309          */
 310
 311         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 312                 vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 313                 int orig_headroom = skb_headroom(skb);
 314                 u16 vlan_tci;
 315
 316                 /* This is not a VLAN frame...but we can fix that! */
 317                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 318
 319                 pr_debug("%s: proto to encap: 0x%hx\n",
 320                          __func__, ntohs(veth->h_vlan_proto));
 321                 /* Construct the second two bytes. This field looks something
 322                  * like:
 323                  * usr_priority: 3 bits  (high bits)
 324                  * CFI           1 bit
 325                  * VLAN ID       12 bits (low bits)
 326                  */
 327                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 328                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 329
 330                 skb = __vlan_put_tag(skb, vlan_tci);
 331                 if (!skb) {
 332                         stats->tx_dropped++;
 333                         return 0;
 334                 }
 335
 336                 if (orig_headroom < VLAN_HLEN)
 337                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 338         }
 339
 340         pr_debug("%s: about to send skb: %p to dev: %s\n",
 341                 __func__, skb, skb->dev->name);
 342         pr_debug("  " MAC_FMT " " MAC_FMT " %4hx %4hx %4hx\n",
 343                  veth->h_dest[0], veth->h_dest[1], veth->h_dest[2],
 344                  veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
 345                  veth->h_source[0], veth->h_source[1], veth->h_source[2],
 346                  veth->h_source[3], veth->h_source[4], veth->h_source[5],
 347                  veth->h_vlan_proto, veth->h_vlan_TCI,
 348                  veth->h_vlan_encapsulated_proto);
 349
 350         stats->tx_packets++; /* for statics only */
 351         stats->tx_bytes += skb->len;
 352
 353         skb->dev = vlan_dev_info(dev)->real_dev;
 354         dev_queue_xmit(skb);
 355
 356         return 0;
 357 }
 358
 359 static int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 360                                             struct net_device *dev)
 361 {
 362         struct net_device_stats *stats = &dev->stats;
 363         u16 vlan_tci;
 364
 365         /* Construct the second two bytes. This field looks something
 366          * like:
 367          * usr_priority: 3 bits  (high bits)
 368          * CFI           1 bit
 369          * VLAN ID       12 bits (low bits)
 370          */
 371         vlan_tci = vlan_dev_info(dev)->vlan_id;
 372         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 373         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 374
 375         stats->tx_packets++;
 376         stats->tx_bytes += skb->len;
 377
 378         skb->dev = vlan_dev_info(dev)->real_dev;
 379         dev_queue_xmit(skb);
 380
 381         return 0;
 382 }
 383
 384 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 385 {
 386         /* TODO: gotta make sure the underlying layer can handle it,
 387          * maybe an IFF_VLAN_CAPABLE flag for devices?
 388          */
 389         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 390                 return -ERANGE;
 391
 392         dev->mtu = new_mtu;
 393
 394         return 0;
 395 }
 396
 397 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 398                                    u32 skb_prio, u16 vlan_prio)
 399 {
 400         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 401
 402         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 403                 vlan->nr_ingress_mappings--;
 404         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 405                 vlan->nr_ingress_mappings++;
 406
 407         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 408 }
 409
 410 int vlan_dev_set_egress_priority(const struct net_device *dev,
 411                                  u32 skb_prio, u16 vlan_prio)
 412 {
 413         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 414         struct vlan_priority_tci_mapping *mp = NULL;
 415         struct vlan_priority_tci_mapping *np;
 416         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
 417
 418         /* See if a priority mapping exists.. */
 419         mp = vlan->egress_priority_map[skb_prio & 0xF];
 420         while (mp) {
 421                 if (mp->priority == skb_prio) {
 422                         if (mp->vlan_qos && !vlan_qos)
 423                                 vlan->nr_egress_mappings--;
 424                         else if (!mp->vlan_qos && vlan_qos)
 425                                 vlan->nr_egress_mappings++;
 426                         mp->vlan_qos = vlan_qos;
 427                         return 0;
 428                 }
 429                 mp = mp->next;
 430         }
 431
 432         /* Create a new mapping then. */
 433         mp = vlan->egress_priority_map[skb_prio & 0xF];
 434         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 435         if (!np)
 436                 return -ENOBUFS;
 437
 438         np->next = mp;
 439         np->priority = skb_prio;
 440         np->vlan_qos = vlan_qos;
 441         vlan->egress_priority_map[skb_prio & 0xF] = np;
 442         if (vlan_qos)
 443                 vlan->nr_egress_mappings++;
 444         return 0;
 445 }
 446
 447 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 448 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 449 {
 450         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 451         u32 old_flags = vlan->flags;
 452
 453         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
 454                 return -EINVAL;
 455
 456         vlan->flags = (old_flags & ~mask) | (flags & mask);
 457
 458         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 459                 if (vlan->flags & VLAN_FLAG_GVRP)
 460                         vlan_gvrp_request_join(dev);
 461                 else
 462                         vlan_gvrp_request_leave(dev);
 463         }
 464         return 0;
 465 }
 466
 467 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 468 {
 469         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 470 }
 471
 472 static int vlan_dev_open(struct net_device *dev)
 473 {
 474         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 475         struct net_device *real_dev = vlan->real_dev;
 476         int err;
 477
 478         if (!(real_dev->flags & IFF_UP))
 479                 return -ENETDOWN;
 480
 481         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 482                 err = dev_unicast_add(real_dev, dev->dev_addr, ETH_ALEN);
 483                 if (err < 0)
 484                         goto out;
 485         }
 486
 487         if (dev->flags & IFF_ALLMULTI) {
 488                 err = dev_set_allmulti(real_dev, 1);
 489                 if (err < 0)
 490                         goto del_unicast;
 491         }
 492         if (dev->flags & IFF_PROMISC) {
 493                 err = dev_set_promiscuity(real_dev, 1);
 494                 if (err < 0)
 495                         goto clear_allmulti;
 496         }
 497
 498         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 499
 500         if (vlan->flags & VLAN_FLAG_GVRP)
 501                 vlan_gvrp_request_join(dev);
 502
 503         return 0;
 504
 505 clear_allmulti:
 506         if (dev->flags & IFF_ALLMULTI)
 507                 dev_set_allmulti(real_dev, -1);
 508 del_unicast:
 509         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 510                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
 511 out:
 512         return err;
 513 }
 514
 515 static int vlan_dev_stop(struct net_device *dev)
 516 {
 517         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 518         struct net_device *real_dev = vlan->real_dev;
 519
 520         if (vlan->flags & VLAN_FLAG_GVRP)
 521                 vlan_gvrp_request_leave(dev);
 522
 523         dev_mc_unsync(real_dev, dev);
 524         dev_unicast_unsync(real_dev, dev);
 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 (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 531                 dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len);
 532
 533         return 0;
 534 }
 535
 536 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 537 {
 538         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 539         struct sockaddr *addr = p;
 540         int err;
 541
 542         if (!is_valid_ether_addr(addr->sa_data))
 543                 return -EADDRNOTAVAIL;
 544
 545         if (!(dev->flags & IFF_UP))
 546                 goto out;
 547
 548         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 549                 err = dev_unicast_add(real_dev, addr->sa_data, ETH_ALEN);
 550                 if (err < 0)
 551                         return err;
 552         }
 553
 554         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 555                 dev_unicast_delete(real_dev, dev->dev_addr, ETH_ALEN);
 556
 557 out:
 558         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 559         return 0;
 560 }
 561
 562 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 563 {
 564         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 565         struct ifreq ifrr;
 566         int err = -EOPNOTSUPP;
 567
 568         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 569         ifrr.ifr_ifru = ifr->ifr_ifru;
 570
 571         switch (cmd) {
 572         case SIOCGMIIPHY:
 573         case SIOCGMIIREG:
 574         case SIOCSMIIREG:
 575                 if (real_dev->do_ioctl && netif_device_present(real_dev))
 576                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
 577                 break;
 578         }
 579
 580         if (!err)
 581                 ifr->ifr_ifru = ifrr.ifr_ifru;
 582
 583         return err;
 584 }
 585
 586 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 587 {
 588         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 589
 590         if (change & IFF_ALLMULTI)
 591                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 592         if (change & IFF_PROMISC)
 593                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 594 }
 595
 596 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 597 {
 598         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 599         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 600 }
 601
 602 /*
 603  * vlan network devices have devices nesting below it, and are a special
 604  * "super class" of normal network devices; split their locks off into a
 605  * separate class since they always nest.
 606  */
 607 static struct lock_class_key vlan_netdev_xmit_lock_key;
 608
 609 static void vlan_dev_set_lockdep_one(struct netdev_queue *txq,
 610                                      int subclass)
 611 {
 612         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 613                                        &vlan_netdev_xmit_lock_key, subclass);
 614 }
 615
 616 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 617 {
 618         vlan_dev_set_lockdep_one(&dev->tx_queue, subclass);
 619 }
 620
 621 static const struct header_ops vlan_header_ops = {
 622         .create  = vlan_dev_hard_header,
 623         .rebuild = vlan_dev_rebuild_header,
 624         .parse   = eth_header_parse,
 625 };
 626
 627 static int vlan_dev_init(struct net_device *dev)
 628 {
 629         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 630         int subclass = 0;
 631
 632         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 633         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 634         dev->iflink = real_dev->ifindex;
 635         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 636                                           (1<<__LINK_STATE_DORMANT))) |
 637                       (1<<__LINK_STATE_PRESENT);
 638
 639         dev->features |= real_dev->features & real_dev->vlan_features;
 640
 641         /* ipv6 shared card related stuff */
 642         dev->dev_id = real_dev->dev_id;
 643
 644         if (is_zero_ether_addr(dev->dev_addr))
 645                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 646         if (is_zero_ether_addr(dev->broadcast))
 647                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 648
 649         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 650                 dev->header_ops      = real_dev->header_ops;
 651                 dev->hard_header_len = real_dev->hard_header_len;
 652                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 653         } else {
 654                 dev->header_ops      = &vlan_header_ops;
 655                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 656                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 657         }
 658
 659         if (is_vlan_dev(real_dev))
 660                 subclass = 1;
 661
 662         vlan_dev_set_lockdep_class(dev, subclass);
 663         return 0;
 664 }
 665
 666 static void vlan_dev_uninit(struct net_device *dev)
 667 {
 668         struct vlan_priority_tci_mapping *pm;
 669         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 670         int i;
 671
 672         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 673                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 674                         vlan->egress_priority_map[i] = pm->next;
 675                         kfree(pm);
 676                 }
 677         }
 678 }
 679
 680 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 681 {
 682         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 683         struct net_device *real_dev = vlan->real_dev;
 684
 685         if (real_dev->ethtool_ops == NULL ||
 686             real_dev->ethtool_ops->get_rx_csum == NULL)
 687                 return 0;
 688         return real_dev->ethtool_ops->get_rx_csum(real_dev);
 689 }
 690
 691 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 692 {
 693         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 694         struct net_device *real_dev = vlan->real_dev;
 695
 696         if (!(real_dev->features & NETIF_F_HW_VLAN_RX) ||
 697             real_dev->ethtool_ops == NULL ||
 698             real_dev->ethtool_ops->get_flags == NULL)
 699                 return 0;
 700         return real_dev->ethtool_ops->get_flags(real_dev);
 701 }
 702
 703 static const struct ethtool_ops vlan_ethtool_ops = {
 704         .get_link               = ethtool_op_get_link,
 705         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 706         .get_flags              = vlan_ethtool_get_flags,
 707 };
 708
 709 void vlan_setup(struct net_device *dev)
 710 {
 711         ether_setup(dev);
 712
 713         dev->priv_flags         |= IFF_802_1Q_VLAN;
 714         dev->tx_queue_len       = 0;
 715
 716         dev->change_mtu         = vlan_dev_change_mtu;
 717         dev->init               = vlan_dev_init;
 718         dev->uninit             = vlan_dev_uninit;
 719         dev->open               = vlan_dev_open;
 720         dev->stop               = vlan_dev_stop;
 721         dev->set_mac_address    = vlan_dev_set_mac_address;
 722         dev->set_rx_mode        = vlan_dev_set_rx_mode;
 723         dev->set_multicast_list = vlan_dev_set_rx_mode;
 724         dev->change_rx_flags    = vlan_dev_change_rx_flags;
 725         dev->do_ioctl           = vlan_dev_ioctl;
 726         dev->destructor         = free_netdev;
 727         dev->ethtool_ops        = &vlan_ethtool_ops;
 728
 729         memset(dev->broadcast, 0, ETH_ALEN);
 730 }