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: vlan@scry.wanfear.com
   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 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                 printk(VLAN_DBG
  64                        "%s: unable to resolve type %X addresses.\n",
  65                        dev->name, (int)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 & 1) {
  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.raw += VLAN_HLEN;
  87                 }
  88         }
  89
  90         return skb;
  91 }
  92
  93 /*
  94  *      Determine the packet's protocol ID. The rule here is that we
  95  *      assume 802.3 if the type field is short enough to be a length.
  96  *      This is normal practice and works for any 'now in use' protocol.
  97  *
  98  *  Also, at this point we assume that we ARE dealing exclusively with
  99  *  VLAN packets, or packets that should be made into VLAN packets based
 100  *  on a default VLAN ID.
 101  *
 102  *  NOTE:  Should be similar to ethernet/eth.c.
 103  *
 104  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 105  *                towards userland.  To get here, it would have already passed
 106  *                through the ethernet/eth.c eth_type_trans() method.
 107  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 108  *                 stored UNALIGNED in the memory.  RISC systems don't like
 109  *                 such cases very much...
 110  *  SANITY NOTE 2a:  According to Dave Miller & Alexey, it will always be aligned,
 111  *                 so there doesn't need to be any of the unaligned stuff.  It has
 112  *                 been commented out now...  --Ben
 113  *
 114  */
 115 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 116                   struct packet_type* ptype, struct net_device *orig_dev)
 117 {
 118         unsigned char *rawp = NULL;
 119         struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data);
 120         unsigned short vid;
 121         struct net_device_stats *stats;
 122         unsigned short vlan_TCI;
 123         __be16 proto;
 124
 125         /* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */
 126         vlan_TCI = ntohs(vhdr->h_vlan_TCI);
 127
 128         vid = (vlan_TCI & VLAN_VID_MASK);
 129
 130 #ifdef VLAN_DEBUG
 131         printk(VLAN_DBG "%s: skb: %p vlan_id: %hx\n",
 132                 __FUNCTION__, skb, vid);
 133 #endif
 134
 135         /* Ok, we will find the correct VLAN device, strip the header,
 136          * and then go on as usual.
 137          */
 138
 139         /* We have 12 bits of vlan ID.
 140          *
 141          * We must not drop allow preempt until we hold a
 142          * reference to the device (netif_rx does that) or we
 143          * fail.
 144          */
 145
 146         rcu_read_lock();
 147         skb->dev = __find_vlan_dev(dev, vid);
 148         if (!skb->dev) {
 149                 rcu_read_unlock();
 150
 151 #ifdef VLAN_DEBUG
 152                 printk(VLAN_DBG "%s: ERROR: No net_device for VID: %i on dev: %s [%i]\n",
 153                         __FUNCTION__, (unsigned int)(vid), dev->name, dev->ifindex);
 154 #endif
 155                 kfree_skb(skb);
 156                 return -1;
 157         }
 158
 159         skb->dev->last_rx = jiffies;
 160
 161         /* Bump the rx counters for the VLAN device. */
 162         stats = vlan_dev_get_stats(skb->dev);
 163         stats->rx_packets++;
 164         stats->rx_bytes += skb->len;
 165
 166         skb_pull(skb, VLAN_HLEN); /* take off the VLAN header (4 bytes currently) */
 167
 168         /* Need to correct hardware checksum */
 169         skb_postpull_rcsum(skb, vhdr, VLAN_HLEN);
 170
 171         /* Ok, lets check to make sure the device (dev) we
 172          * came in on is what this VLAN is attached to.
 173          */
 174
 175         if (dev != VLAN_DEV_INFO(skb->dev)->real_dev) {
 176                 rcu_read_unlock();
 177
 178 #ifdef VLAN_DEBUG
 179                 printk(VLAN_DBG "%s: dropping skb: %p because came in on wrong device, dev: %s  real_dev: %s, skb_dev: %s\n",
 180                         __FUNCTION__, skb, dev->name,
 181                         VLAN_DEV_INFO(skb->dev)->real_dev->name,
 182                         skb->dev->name);
 183 #endif
 184                 kfree_skb(skb);
 185                 stats->rx_errors++;
 186                 return -1;
 187         }
 188
 189         /*
 190          * Deal with ingress priority mapping.
 191          */
 192         skb->priority = vlan_get_ingress_priority(skb->dev, ntohs(vhdr->h_vlan_TCI));
 193
 194 #ifdef VLAN_DEBUG
 195         printk(VLAN_DBG "%s: priority: %lu  for TCI: %hu (hbo)\n",
 196                 __FUNCTION__, (unsigned long)(skb->priority),
 197                 ntohs(vhdr->h_vlan_TCI));
 198 #endif
 199
 200         /* The ethernet driver already did the pkt_type calculations
 201          * for us...
 202          */
 203         switch (skb->pkt_type) {
 204         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 205                 // stats->broadcast ++; // no such counter :-(
 206                 break;
 207
 208         case PACKET_MULTICAST:
 209                 stats->multicast++;
 210                 break;
 211
 212         case PACKET_OTHERHOST:
 213                 /* Our lower layer thinks this is not local, let's make sure.
 214                  * This allows the VLAN to have a different MAC than the underlying
 215                  * device, and still route correctly.
 216                  */
 217                 if (!compare_ether_addr(eth_hdr(skb)->h_dest, skb->dev->dev_addr)) {
 218                         /* It is for our (changed) MAC-address! */
 219                         skb->pkt_type = PACKET_HOST;
 220                 }
 221                 break;
 222         default:
 223                 break;
 224         };
 225
 226         /*  Was a VLAN packet, grab the encapsulated protocol, which the layer
 227          * three protocols care about.
 228          */
 229         /* proto = get_unaligned(&vhdr->h_vlan_encapsulated_proto); */
 230         proto = vhdr->h_vlan_encapsulated_proto;
 231
 232         skb->protocol = proto;
 233         if (ntohs(proto) >= 1536) {
 234                 /* place it back on the queue to be handled by
 235                  * true layer 3 protocols.
 236                  */
 237
 238                 /* See if we are configured to re-write the VLAN header
 239                  * to make it look like ethernet...
 240                  */
 241                 skb = vlan_check_reorder_header(skb);
 242
 243                 /* Can be null if skb-clone fails when re-ordering */
 244                 if (skb) {
 245                         netif_rx(skb);
 246                 } else {
 247                         /* TODO:  Add a more specific counter here. */
 248                         stats->rx_errors++;
 249                 }
 250                 rcu_read_unlock();
 251                 return 0;
 252         }
 253
 254         rawp = skb->data;
 255
 256         /*
 257          * This is a magic hack to spot IPX packets. Older Novell breaks
 258          * the protocol design and runs IPX over 802.3 without an 802.2 LLC
 259          * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 260          * won't work for fault tolerant netware but does for the rest.
 261          */
 262         if (*(unsigned short *)rawp == 0xFFFF) {
 263                 skb->protocol = __constant_htons(ETH_P_802_3);
 264                 /* place it back on the queue to be handled by true layer 3 protocols.
 265                  */
 266
 267                 /* See if we are configured to re-write the VLAN header
 268                  * to make it look like ethernet...
 269                  */
 270                 skb = vlan_check_reorder_header(skb);
 271
 272                 /* Can be null if skb-clone fails when re-ordering */
 273                 if (skb) {
 274                         netif_rx(skb);
 275                 } else {
 276                         /* TODO:  Add a more specific counter here. */
 277                         stats->rx_errors++;
 278                 }
 279                 rcu_read_unlock();
 280                 return 0;
 281         }
 282
 283         /*
 284          *      Real 802.2 LLC
 285          */
 286         skb->protocol = __constant_htons(ETH_P_802_2);
 287         /* place it back on the queue to be handled by upper layer protocols.
 288          */
 289
 290         /* See if we are configured to re-write the VLAN header
 291          * to make it look like ethernet...
 292          */
 293         skb = vlan_check_reorder_header(skb);
 294
 295         /* Can be null if skb-clone fails when re-ordering */
 296         if (skb) {
 297                 netif_rx(skb);
 298         } else {
 299                 /* TODO:  Add a more specific counter here. */
 300                 stats->rx_errors++;
 301         }
 302         rcu_read_unlock();
 303         return 0;
 304 }
 305
 306 static inline unsigned short vlan_dev_get_egress_qos_mask(struct net_device* dev,
 307                                                           struct sk_buff* skb)
 308 {
 309         struct vlan_priority_tci_mapping *mp =
 310                 VLAN_DEV_INFO(dev)->egress_priority_map[(skb->priority & 0xF)];
 311
 312         while (mp) {
 313                 if (mp->priority == skb->priority) {
 314                         return mp->vlan_qos; /* This should already be shifted to mask
 315                                               * correctly with the VLAN's TCI
 316                                               */
 317                 }
 318                 mp = mp->next;
 319         }
 320         return 0;
 321 }
 322
 323 /*
 324  *      Create the VLAN header for an arbitrary protocol layer
 325  *
 326  *      saddr=NULL      means use device source address
 327  *      daddr=NULL      means leave destination address (eg unresolved arp)
 328  *
 329  *  This is called when the SKB is moving down the stack towards the
 330  *  physical devices.
 331  */
 332 int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 333                          unsigned short type, void *daddr, void *saddr,
 334                          unsigned len)
 335 {
 336         struct vlan_hdr *vhdr;
 337         unsigned short veth_TCI = 0;
 338         int rc = 0;
 339         int build_vlan_header = 0;
 340         struct net_device *vdev = dev; /* save this for the bottom of the method */
 341
 342 #ifdef VLAN_DEBUG
 343         printk(VLAN_DBG "%s: skb: %p type: %hx len: %x vlan_id: %hx, daddr: %p\n",
 344                 __FUNCTION__, skb, type, len, VLAN_DEV_INFO(dev)->vlan_id, daddr);
 345 #endif
 346
 347         /* build vlan header only if re_order_header flag is NOT set.  This
 348          * fixes some programs that get confused when they see a VLAN device
 349          * sending a frame that is VLAN encoded (the consensus is that the VLAN
 350          * device should look completely like an Ethernet device when the
 351          * REORDER_HEADER flag is set)  The drawback to this is some extra
 352          * header shuffling in the hard_start_xmit.  Users can turn off this
 353          * REORDER behaviour with the vconfig tool.
 354          */
 355         build_vlan_header = ((VLAN_DEV_INFO(dev)->flags & 1) == 0);
 356
 357         if (build_vlan_header) {
 358                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 359
 360                 /* build the four bytes that make this a VLAN header. */
 361
 362                 /* Now, construct the second two bytes. This field looks something
 363                  * like:
 364                  * usr_priority: 3 bits  (high bits)
 365                  * CFI           1 bit
 366                  * VLAN ID       12 bits (low bits)
 367                  *
 368                  */
 369                 veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
 370                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 371
 372                 vhdr->h_vlan_TCI = htons(veth_TCI);
 373
 374                 /*
 375                  *  Set the protocol type.
 376                  *  For a packet of type ETH_P_802_3 we put the length in here instead.
 377                  *  It is up to the 802.2 layer to carry protocol information.
 378                  */
 379
 380                 if (type != ETH_P_802_3) {
 381                         vhdr->h_vlan_encapsulated_proto = htons(type);
 382                 } else {
 383                         vhdr->h_vlan_encapsulated_proto = htons(len);
 384                 }
 385         }
 386
 387         /* Before delegating work to the lower layer, enter our MAC-address */
 388         if (saddr == NULL)
 389                 saddr = dev->dev_addr;
 390
 391         dev = VLAN_DEV_INFO(dev)->real_dev;
 392
 393         /* MPLS can send us skbuffs w/out enough space.  This check will grow the
 394          * skb if it doesn't have enough headroom.  Not a beautiful solution, so
 395          * I'll tick a counter so that users can know it's happening...  If they
 396          * care...
 397          */
 398
 399         /* NOTE:  This may still break if the underlying device is not the final
 400          * device (and thus there are more headers to add...)  It should work for
 401          * good-ole-ethernet though.
 402          */
 403         if (skb_headroom(skb) < dev->hard_header_len) {
 404                 struct sk_buff *sk_tmp = skb;
 405                 skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
 406                 kfree_skb(sk_tmp);
 407                 if (skb == NULL) {
 408                         struct net_device_stats *stats = vlan_dev_get_stats(vdev);
 409                         stats->tx_dropped++;
 410                         return -ENOMEM;
 411                 }
 412                 VLAN_DEV_INFO(vdev)->cnt_inc_headroom_on_tx++;
 413 #ifdef VLAN_DEBUG
 414                 printk(VLAN_DBG "%s: %s: had to grow skb.\n", __FUNCTION__, vdev->name);
 415 #endif
 416         }
 417
 418         if (build_vlan_header) {
 419                 /* Now make the underlying real hard header */
 420                 rc = dev->hard_header(skb, dev, ETH_P_8021Q, daddr, saddr, len + VLAN_HLEN);
 421
 422                 if (rc > 0) {
 423                         rc += VLAN_HLEN;
 424                 } else if (rc < 0) {
 425                         rc -= VLAN_HLEN;
 426                 }
 427         } else {
 428                 /* If here, then we'll just make a normal looking ethernet frame,
 429                  * but, the hard_start_xmit method will insert the tag (it has to
 430                  * be able to do this for bridged and other skbs that don't come
 431                  * down the protocol stack in an orderly manner.
 432                  */
 433                 rc = dev->hard_header(skb, dev, type, daddr, saddr, len);
 434         }
 435
 436         return rc;
 437 }
 438
 439 int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 440 {
 441         struct net_device_stats *stats = vlan_dev_get_stats(dev);
 442         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 443
 444         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 445          *
 446          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 447          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 448          */
 449
 450         if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
 451                 int orig_headroom = skb_headroom(skb);
 452                 unsigned short veth_TCI;
 453
 454                 /* This is not a VLAN frame...but we can fix that! */
 455                 VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++;
 456
 457 #ifdef VLAN_DEBUG
 458                 printk(VLAN_DBG "%s: proto to encap: 0x%hx (hbo)\n",
 459                         __FUNCTION__, htons(veth->h_vlan_proto));
 460 #endif
 461                 /* Construct the second two bytes. This field looks something
 462                  * like:
 463                  * usr_priority: 3 bits  (high bits)
 464                  * CFI           1 bit
 465                  * VLAN ID       12 bits (low bits)
 466                  */
 467                 veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
 468                 veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 469
 470                 skb = __vlan_put_tag(skb, veth_TCI);
 471                 if (!skb) {
 472                         stats->tx_dropped++;
 473                         return 0;
 474                 }
 475
 476                 if (orig_headroom < VLAN_HLEN) {
 477                         VLAN_DEV_INFO(dev)->cnt_inc_headroom_on_tx++;
 478                 }
 479         }
 480
 481 #ifdef VLAN_DEBUG
 482         printk(VLAN_DBG "%s: about to send skb: %p to dev: %s\n",
 483                 __FUNCTION__, skb, skb->dev->name);
 484         printk(VLAN_DBG "  %2hx.%2hx.%2hx.%2xh.%2hx.%2hx %2hx.%2hx.%2hx.%2hx.%2hx.%2hx %4hx %4hx %4hx\n",
 485                veth->h_dest[0], veth->h_dest[1], veth->h_dest[2], veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
 486                veth->h_source[0], veth->h_source[1], veth->h_source[2], veth->h_source[3], veth->h_source[4], veth->h_source[5],
 487                veth->h_vlan_proto, veth->h_vlan_TCI, veth->h_vlan_encapsulated_proto);
 488 #endif
 489
 490         stats->tx_packets++; /* for statics only */
 491         stats->tx_bytes += skb->len;
 492
 493         skb->dev = VLAN_DEV_INFO(dev)->real_dev;
 494         dev_queue_xmit(skb);
 495
 496         return 0;
 497 }
 498
 499 int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 500 {
 501         struct net_device_stats *stats = vlan_dev_get_stats(dev);
 502         unsigned short veth_TCI;
 503
 504         /* Construct the second two bytes. This field looks something
 505          * like:
 506          * usr_priority: 3 bits  (high bits)
 507          * CFI           1 bit
 508          * VLAN ID       12 bits (low bits)
 509          */
 510         veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
 511         veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
 512         skb = __vlan_hwaccel_put_tag(skb, veth_TCI);
 513
 514         stats->tx_packets++;
 515         stats->tx_bytes += skb->len;
 516
 517         skb->dev = VLAN_DEV_INFO(dev)->real_dev;
 518         dev_queue_xmit(skb);
 519
 520         return 0;
 521 }
 522
 523 int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 524 {
 525         /* TODO: gotta make sure the underlying layer can handle it,
 526          * maybe an IFF_VLAN_CAPABLE flag for devices?
 527          */
 528         if (VLAN_DEV_INFO(dev)->real_dev->mtu < new_mtu)
 529                 return -ERANGE;
 530
 531         dev->mtu = new_mtu;
 532
 533         return 0;
 534 }
 535
 536 int vlan_dev_set_ingress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
 537 {
 538         struct net_device *dev = dev_get_by_name(dev_name);
 539
 540         if (dev) {
 541                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 542                         /* see if a priority mapping exists.. */
 543                         VLAN_DEV_INFO(dev)->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 544                         dev_put(dev);
 545                         return 0;
 546                 }
 547
 548                 dev_put(dev);
 549         }
 550         return -EINVAL;
 551 }
 552
 553 int vlan_dev_set_egress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
 554 {
 555         struct net_device *dev = dev_get_by_name(dev_name);
 556         struct vlan_priority_tci_mapping *mp = NULL;
 557         struct vlan_priority_tci_mapping *np;
 558
 559         if (dev) {
 560                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 561                         /* See if a priority mapping exists.. */
 562                         mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
 563                         while (mp) {
 564                                 if (mp->priority == skb_prio) {
 565                                         mp->vlan_qos = ((vlan_prio << 13) & 0xE000);
 566                                         dev_put(dev);
 567                                         return 0;
 568                                 }
 569                                 mp = mp->next;
 570                         }
 571
 572                         /* Create a new mapping then. */
 573                         mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
 574                         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 575                         if (np) {
 576                                 np->next = mp;
 577                                 np->priority = skb_prio;
 578                                 np->vlan_qos = ((vlan_prio << 13) & 0xE000);
 579                                 VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF] = np;
 580                                 dev_put(dev);
 581                                 return 0;
 582                         } else {
 583                                 dev_put(dev);
 584                                 return -ENOBUFS;
 585                         }
 586                 }
 587                 dev_put(dev);
 588         }
 589         return -EINVAL;
 590 }
 591
 592 /* Flags are defined in the vlan_dev_info class in include/linux/if_vlan.h file. */
 593 int vlan_dev_set_vlan_flag(char *dev_name, __u32 flag, short flag_val)
 594 {
 595         struct net_device *dev = dev_get_by_name(dev_name);
 596
 597         if (dev) {
 598                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 599                         /* verify flag is supported */
 600                         if (flag == 1) {
 601                                 if (flag_val) {
 602                                         VLAN_DEV_INFO(dev)->flags |= 1;
 603                                 } else {
 604                                         VLAN_DEV_INFO(dev)->flags &= ~1;
 605                                 }
 606                                 dev_put(dev);
 607                                 return 0;
 608                         } else {
 609                                 printk(KERN_ERR  "%s: flag %i is not valid.\n",
 610                                         __FUNCTION__, (int)(flag));
 611                                 dev_put(dev);
 612                                 return -EINVAL;
 613                         }
 614                 } else {
 615                         printk(KERN_ERR
 616                                "%s: %s is not a vlan device, priv_flags: %hX.\n",
 617                                __FUNCTION__, dev->name, dev->priv_flags);
 618                         dev_put(dev);
 619                 }
 620         } else {
 621                 printk(KERN_ERR  "%s: Could not find device: %s\n",
 622                         __FUNCTION__, dev_name);
 623         }
 624
 625         return -EINVAL;
 626 }
 627
 628
 629 int vlan_dev_get_realdev_name(const char *dev_name, char* result)
 630 {
 631         struct net_device *dev = dev_get_by_name(dev_name);
 632         int rv = 0;
 633         if (dev) {
 634                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 635                         strncpy(result, VLAN_DEV_INFO(dev)->real_dev->name, 23);
 636                         rv = 0;
 637                 } else {
 638                         rv = -EINVAL;
 639                 }
 640                 dev_put(dev);
 641         } else {
 642                 rv = -ENODEV;
 643         }
 644         return rv;
 645 }
 646
 647 int vlan_dev_get_vid(const char *dev_name, unsigned short* result)
 648 {
 649         struct net_device *dev = dev_get_by_name(dev_name);
 650         int rv = 0;
 651         if (dev) {
 652                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 653                         *result = VLAN_DEV_INFO(dev)->vlan_id;
 654                         rv = 0;
 655                 } else {
 656                         rv = -EINVAL;
 657                 }
 658                 dev_put(dev);
 659         } else {
 660                 rv = -ENODEV;
 661         }
 662         return rv;
 663 }
 664
 665
 666 int vlan_dev_set_mac_address(struct net_device *dev, void *addr_struct_p)
 667 {
 668         struct sockaddr *addr = (struct sockaddr *)(addr_struct_p);
 669         int i;
 670
 671         if (netif_running(dev))
 672                 return -EBUSY;
 673
 674         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 675
 676         printk("%s: Setting MAC address to ", dev->name);
 677         for (i = 0; i < 6; i++)
 678                 printk(" %2.2x", dev->dev_addr[i]);
 679         printk(".\n");
 680
 681         if (memcmp(VLAN_DEV_INFO(dev)->real_dev->dev_addr,
 682                    dev->dev_addr,
 683                    dev->addr_len) != 0) {
 684                 if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_PROMISC)) {
 685                         int flgs = VLAN_DEV_INFO(dev)->real_dev->flags;
 686
 687                         /* Increment our in-use promiscuity counter */
 688                         dev_set_promiscuity(VLAN_DEV_INFO(dev)->real_dev, 1);
 689
 690                         /* Make PROMISC visible to the user. */
 691                         flgs |= IFF_PROMISC;
 692                         printk("VLAN (%s):  Setting underlying device (%s) to promiscious mode.\n",
 693                                dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
 694                         dev_change_flags(VLAN_DEV_INFO(dev)->real_dev, flgs);
 695                 }
 696         } else {
 697                 printk("VLAN (%s):  Underlying device (%s) has same MAC, not checking promiscious mode.\n",
 698                        dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
 699         }
 700
 701         return 0;
 702 }
 703
 704 static inline int vlan_dmi_equals(struct dev_mc_list *dmi1,
 705                                   struct dev_mc_list *dmi2)
 706 {
 707         return ((dmi1->dmi_addrlen == dmi2->dmi_addrlen) &&
 708                 (memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0));
 709 }
 710
 711 /** dmi is a single entry into a dev_mc_list, a single node.  mc_list is
 712  *  an entire list, and we'll iterate through it.
 713  */
 714 static int vlan_should_add_mc(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
 715 {
 716         struct dev_mc_list *idmi;
 717
 718         for (idmi = mc_list; idmi != NULL; ) {
 719                 if (vlan_dmi_equals(dmi, idmi)) {
 720                         if (dmi->dmi_users > idmi->dmi_users)
 721                                 return 1;
 722                         else
 723                                 return 0;
 724                 } else {
 725                         idmi = idmi->next;
 726                 }
 727         }
 728
 729         return 1;
 730 }
 731
 732 static inline void vlan_destroy_mc_list(struct dev_mc_list *mc_list)
 733 {
 734         struct dev_mc_list *dmi = mc_list;
 735         struct dev_mc_list *next;
 736
 737         while(dmi) {
 738                 next = dmi->next;
 739                 kfree(dmi);
 740                 dmi = next;
 741         }
 742 }
 743
 744 static void vlan_copy_mc_list(struct dev_mc_list *mc_list, struct vlan_dev_info *vlan_info)
 745 {
 746         struct dev_mc_list *dmi, *new_dmi;
 747
 748         vlan_destroy_mc_list(vlan_info->old_mc_list);
 749         vlan_info->old_mc_list = NULL;
 750
 751         for (dmi = mc_list; dmi != NULL; dmi = dmi->next) {
 752                 new_dmi = kmalloc(sizeof(*new_dmi), GFP_ATOMIC);
 753                 if (new_dmi == NULL) {
 754                         printk(KERN_ERR "vlan: cannot allocate memory. "
 755                                "Multicast may not work properly from now.\n");
 756                         return;
 757                 }
 758
 759                 /* Copy whole structure, then make new 'next' pointer */
 760                 *new_dmi = *dmi;
 761                 new_dmi->next = vlan_info->old_mc_list;
 762                 vlan_info->old_mc_list = new_dmi;
 763         }
 764 }
 765
 766 static void vlan_flush_mc_list(struct net_device *dev)
 767 {
 768         struct dev_mc_list *dmi = dev->mc_list;
 769
 770         while (dmi) {
 771                 printk(KERN_DEBUG "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from vlan interface\n",
 772                        dev->name,
 773                        dmi->dmi_addr[0],
 774                        dmi->dmi_addr[1],
 775                        dmi->dmi_addr[2],
 776                        dmi->dmi_addr[3],
 777                        dmi->dmi_addr[4],
 778                        dmi->dmi_addr[5]);
 779                 dev_mc_delete(dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 780                 dmi = dev->mc_list;
 781         }
 782
 783         /* dev->mc_list is NULL by the time we get here. */
 784         vlan_destroy_mc_list(VLAN_DEV_INFO(dev)->old_mc_list);
 785         VLAN_DEV_INFO(dev)->old_mc_list = NULL;
 786 }
 787
 788 int vlan_dev_open(struct net_device *dev)
 789 {
 790         if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_UP))
 791                 return -ENETDOWN;
 792
 793         return 0;
 794 }
 795
 796 int vlan_dev_stop(struct net_device *dev)
 797 {
 798         vlan_flush_mc_list(dev);
 799         return 0;
 800 }
 801
 802 int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 803 {
 804         struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
 805         struct ifreq ifrr;
 806         int err = -EOPNOTSUPP;
 807
 808         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 809         ifrr.ifr_ifru = ifr->ifr_ifru;
 810
 811         switch(cmd) {
 812         case SIOCGMIIPHY:
 813         case SIOCGMIIREG:
 814         case SIOCSMIIREG:
 815                 if (real_dev->do_ioctl && netif_device_present(real_dev))
 816                         err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
 817                 break;
 818
 819         case SIOCETHTOOL:
 820                 err = dev_ethtool(&ifrr);
 821         }
 822
 823         if (!err)
 824                 ifr->ifr_ifru = ifrr.ifr_ifru;
 825
 826         return err;
 827 }
 828
 829 /** Taken from Gleb + Lennert's VLAN code, and modified... */
 830 void vlan_dev_set_multicast_list(struct net_device *vlan_dev)
 831 {
 832         struct dev_mc_list *dmi;
 833         struct net_device *real_dev;
 834         int inc;
 835
 836         if (vlan_dev && (vlan_dev->priv_flags & IFF_802_1Q_VLAN)) {
 837                 /* Then it's a real vlan device, as far as we can tell.. */
 838                 real_dev = VLAN_DEV_INFO(vlan_dev)->real_dev;
 839
 840                 /* compare the current promiscuity to the last promisc we had.. */
 841                 inc = vlan_dev->promiscuity - VLAN_DEV_INFO(vlan_dev)->old_promiscuity;
 842                 if (inc) {
 843                         printk(KERN_INFO "%s: dev_set_promiscuity(master, %d)\n",
 844                                vlan_dev->name, inc);
 845                         dev_set_promiscuity(real_dev, inc); /* found in dev.c */
 846                         VLAN_DEV_INFO(vlan_dev)->old_promiscuity = vlan_dev->promiscuity;
 847                 }
 848
 849                 inc = vlan_dev->allmulti - VLAN_DEV_INFO(vlan_dev)->old_allmulti;
 850                 if (inc) {
 851                         printk(KERN_INFO "%s: dev_set_allmulti(master, %d)\n",
 852                                vlan_dev->name, inc);
 853                         dev_set_allmulti(real_dev, inc); /* dev.c */
 854                         VLAN_DEV_INFO(vlan_dev)->old_allmulti = vlan_dev->allmulti;
 855                 }
 856
 857                 /* looking for addresses to add to master's list */
 858                 for (dmi = vlan_dev->mc_list; dmi != NULL; dmi = dmi->next) {
 859                         if (vlan_should_add_mc(dmi, VLAN_DEV_INFO(vlan_dev)->old_mc_list)) {
 860                                 dev_mc_add(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 861                                 printk(KERN_DEBUG "%s: add %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address to master interface\n",
 862                                        vlan_dev->name,
 863                                        dmi->dmi_addr[0],
 864                                        dmi->dmi_addr[1],
 865                                        dmi->dmi_addr[2],
 866                                        dmi->dmi_addr[3],
 867                                        dmi->dmi_addr[4],
 868                                        dmi->dmi_addr[5]);
 869                         }
 870                 }
 871
 872                 /* looking for addresses to delete from master's list */
 873                 for (dmi = VLAN_DEV_INFO(vlan_dev)->old_mc_list; dmi != NULL; dmi = dmi->next) {
 874                         if (vlan_should_add_mc(dmi, vlan_dev->mc_list)) {
 875                                 /* if we think we should add it to the new list, then we should really
 876                                  * delete it from the real list on the underlying device.
 877                                  */
 878                                 dev_mc_delete(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
 879                                 printk(KERN_DEBUG "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from master interface\n",
 880                                        vlan_dev->name,
 881                                        dmi->dmi_addr[0],
 882                                        dmi->dmi_addr[1],
 883                                        dmi->dmi_addr[2],
 884                                        dmi->dmi_addr[3],
 885                                        dmi->dmi_addr[4],
 886                                        dmi->dmi_addr[5]);
 887                         }
 888                 }
 889
 890                 /* save multicast list */
 891                 vlan_copy_mc_list(vlan_dev->mc_list, VLAN_DEV_INFO(vlan_dev));
 892         }
 893 }