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/skbuff.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <net/arp.h>
  29
  30 #include "vlan.h"
  31 #include "vlanproc.h"
  32 #include <linux/if_vlan.h>
  33
  34 /*
  35  *      Rebuild the Ethernet MAC header. This is called after an ARP
  36  *      (or in future other address resolution) has completed on this
  37  *      sk_buff. We now let ARP fill in the other fields.
  38  *
  39  *      This routine CANNOT use cached dst->neigh!
  40  *      Really, it is used only when dst->neigh is wrong.
  41  *
  42  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  43  */
  44 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  45 {
  46         struct net_device *dev = skb->dev;
  47         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  48
  49         switch (veth->h_vlan_encapsulated_proto) {
  50 #ifdef CONFIG_INET
  51         case htons(ETH_P_IP):
  52
  53                 /* TODO:  Confirm this will work with VLAN headers... */
  54                 return arp_find(veth->h_dest, skb);
  55 #endif
  56         default:
  57                 pr_debug("%s: unable to resolve type %X addresses.\n",
  58                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  59
  60                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  61                 break;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
  68 {
  69         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
  70                 if (skb_cow(skb, skb_headroom(skb)) < 0)
  71                         skb = NULL;
  72                 if (skb) {
  73                         /* Lifted from Gleb's VLAN code... */
  74                         memmove(skb->data - ETH_HLEN,
  75                                 skb->data - VLAN_ETH_HLEN, 12);
  76                         skb->mac_header += VLAN_HLEN;
  77                 }
  78         }
  79
  80         return skb;
  81 }
  82
  83 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  84                 struct vlan_hdr *vhdr)
  85 {
  86         __be16 proto;
  87         unsigned char *rawp;
  88
  89         /*
  90          * Was a VLAN packet, grab the encapsulated protocol, which the layer
  91          * three protocols care about.
  92          */
  93
  94         proto = vhdr->h_vlan_encapsulated_proto;
  95         if (ntohs(proto) >= 1536) {
  96                 skb->protocol = proto;
  97                 return;
  98         }
  99
 100         rawp = skb->data;
 101         if (*(unsigned short *)rawp == 0xFFFF)
 102                 /*
 103                  * This is a magic hack to spot IPX packets. Older Novell
 104                  * breaks the protocol design and runs IPX over 802.3 without
 105                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 106                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 107                  * but does for the rest.
 108                  */
 109                 skb->protocol = htons(ETH_P_802_3);
 110         else
 111                 /*
 112                  * Real 802.2 LLC
 113                  */
 114                 skb->protocol = htons(ETH_P_802_2);
 115 }
 116
 117 /*
 118  *      Determine the packet's protocol ID. The rule here is that we
 119  *      assume 802.3 if the type field is short enough to be a length.
 120  *      This is normal practice and works for any 'now in use' protocol.
 121  *
 122  *  Also, at this point we assume that we ARE dealing exclusively with
 123  *  VLAN packets, or packets that should be made into VLAN packets based
 124  *  on a default VLAN ID.
 125  *
 126  *  NOTE:  Should be similar to ethernet/eth.c.
 127  *
 128  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 129  *                towards userland.  To get here, it would have already passed
 130  *                through the ethernet/eth.c eth_type_trans() method.
 131  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 132  *                 stored UNALIGNED in the memory.  RISC systems don't like
 133  *                 such cases very much...
 134  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 135  *                  aligned, so there doesn't need to be any of the unaligned
 136  *                  stuff.  It has been commented out now...  --Ben
 137  *
 138  */
 139 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 140                   struct packet_type *ptype, struct net_device *orig_dev)
 141 {
 142         struct vlan_hdr *vhdr;
 143         struct vlan_rx_stats *rx_stats;
 144         u16 vlan_id;
 145         u16 vlan_tci;
 146
 147         skb = skb_share_check(skb, GFP_ATOMIC);
 148         if (skb == NULL)
 149                 goto err_free;
 150
 151         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 152                 goto err_free;
 153
 154         vhdr = (struct vlan_hdr *)skb->data;
 155         vlan_tci = ntohs(vhdr->h_vlan_TCI);
 156         vlan_id = vlan_tci & VLAN_VID_MASK;
 157
 158         rcu_read_lock();
 159         skb->dev = __find_vlan_dev(dev, vlan_id);
 160         if (!skb->dev) {
 161                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 162                          __func__, vlan_id, dev->name);
 163                 goto err_unlock;
 164         }
 165
 166         rx_stats = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats,
 167                                smp_processor_id());
 168         rx_stats->rx_packets++;
 169         rx_stats->rx_bytes += skb->len;
 170
 171         skb_pull_rcsum(skb, VLAN_HLEN);
 172
 173         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 174
 175         pr_debug("%s: priority: %u for TCI: %hu\n",
 176                  __func__, skb->priority, vlan_tci);
 177
 178         switch (skb->pkt_type) {
 179         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 180                 /* stats->broadcast ++; // no such counter :-( */
 181                 break;
 182
 183         case PACKET_MULTICAST:
 184                 rx_stats->multicast++;
 185                 break;
 186
 187         case PACKET_OTHERHOST:
 188                 /* Our lower layer thinks this is not local, let's make sure.
 189                  * This allows the VLAN to have a different MAC than the
 190                  * underlying device, and still route correctly.
 191                  */
 192                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 193                                         skb->dev->dev_addr))
 194                         skb->pkt_type = PACKET_HOST;
 195                 break;
 196         default:
 197                 break;
 198         }
 199
 200         vlan_set_encap_proto(skb, vhdr);
 201
 202         skb = vlan_check_reorder_header(skb);
 203         if (!skb) {
 204                 rx_stats->rx_errors++;
 205                 goto err_unlock;
 206         }
 207
 208         netif_rx(skb);
 209         rcu_read_unlock();
 210         return NET_RX_SUCCESS;
 211
 212 err_unlock:
 213         rcu_read_unlock();
 214 err_free:
 215         kfree_skb(skb);
 216         return NET_RX_DROP;
 217 }
 218
 219 static inline u16
 220 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 221 {
 222         struct vlan_priority_tci_mapping *mp;
 223
 224         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 225         while (mp) {
 226                 if (mp->priority == skb->priority) {
 227                         return mp->vlan_qos; /* This should already be shifted
 228                                               * to mask correctly with the
 229                                               * VLAN's TCI */
 230                 }
 231                 mp = mp->next;
 232         }
 233         return 0;
 234 }
 235
 236 /*
 237  *      Create the VLAN header for an arbitrary protocol layer
 238  *
 239  *      saddr=NULL      means use device source address
 240  *      daddr=NULL      means leave destination address (eg unresolved arp)
 241  *
 242  *  This is called when the SKB is moving down the stack towards the
 243  *  physical devices.
 244  */
 245 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 246                                 unsigned short type,
 247                                 const void *daddr, const void *saddr,
 248                                 unsigned int len)
 249 {
 250         struct vlan_hdr *vhdr;
 251         unsigned int vhdrlen = 0;
 252         u16 vlan_tci = 0;
 253         int rc;
 254
 255         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 256                 return -ENOSPC;
 257
 258         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 259                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 260
 261                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 262                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 263                 vhdr->h_vlan_TCI = htons(vlan_tci);
 264
 265                 /*
 266                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
 267                  *  put the length in here instead. It is up to the 802.2
 268                  *  layer to carry protocol information.
 269                  */
 270                 if (type != ETH_P_802_3)
 271                         vhdr->h_vlan_encapsulated_proto = htons(type);
 272                 else
 273                         vhdr->h_vlan_encapsulated_proto = htons(len);
 274
 275                 skb->protocol = htons(ETH_P_8021Q);
 276                 type = ETH_P_8021Q;
 277                 vhdrlen = VLAN_HLEN;
 278         }
 279
 280         /* Before delegating work to the lower layer, enter our MAC-address */
 281         if (saddr == NULL)
 282                 saddr = dev->dev_addr;
 283
 284         /* Now make the underlying real hard header */
 285         dev = vlan_dev_info(dev)->real_dev;
 286         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 287         if (rc > 0)
 288                 rc += vhdrlen;
 289         return rc;
 290 }
 291
 292 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 293                                             struct net_device *dev)
 294 {
 295         int i = skb_get_queue_mapping(skb);
 296         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 297         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 298         unsigned int len;
 299         int ret;
 300
 301         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 302          *
 303          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 304          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 305          */
 306         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 307             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 308                 unsigned int orig_headroom = skb_headroom(skb);
 309                 u16 vlan_tci;
 310
 311                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 312
 313                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 314                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 315                 skb = __vlan_put_tag(skb, vlan_tci);
 316                 if (!skb) {
 317                         txq->tx_dropped++;
 318                         return NETDEV_TX_OK;
 319                 }
 320
 321                 if (orig_headroom < VLAN_HLEN)
 322                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 323         }
 324
 325
 326         skb->dev = vlan_dev_info(dev)->real_dev;
 327         len = skb->len;
 328         ret = dev_queue_xmit(skb);
 329
 330         if (likely(ret == NET_XMIT_SUCCESS)) {
 331                 txq->tx_packets++;
 332                 txq->tx_bytes += len;
 333         } else
 334                 txq->tx_dropped++;
 335
 336         return ret;
 337 }
 338
 339 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 340                                                     struct net_device *dev)
 341 {
 342         int i = skb_get_queue_mapping(skb);
 343         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 344         u16 vlan_tci;
 345         unsigned int len;
 346         int ret;
 347
 348         vlan_tci = vlan_dev_info(dev)->vlan_id;
 349         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 350         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 351
 352         skb->dev = vlan_dev_info(dev)->real_dev;
 353         len = skb->len;
 354         ret = dev_queue_xmit(skb);
 355
 356         if (likely(ret == NET_XMIT_SUCCESS)) {
 357                 txq->tx_packets++;
 358                 txq->tx_bytes += len;
 359         } else
 360                 txq->tx_dropped++;
 361
 362         return ret;
 363 }
 364
 365 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 366 {
 367         /* TODO: gotta make sure the underlying layer can handle it,
 368          * maybe an IFF_VLAN_CAPABLE flag for devices?
 369          */
 370         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 371                 return -ERANGE;
 372
 373         dev->mtu = new_mtu;
 374
 375         return 0;
 376 }
 377
 378 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 379                                    u32 skb_prio, u16 vlan_prio)
 380 {
 381         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 382
 383         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 384                 vlan->nr_ingress_mappings--;
 385         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 386                 vlan->nr_ingress_mappings++;
 387
 388         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 389 }
 390
 391 int vlan_dev_set_egress_priority(const struct net_device *dev,
 392                                  u32 skb_prio, u16 vlan_prio)
 393 {
 394         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 395         struct vlan_priority_tci_mapping *mp = NULL;
 396         struct vlan_priority_tci_mapping *np;
 397         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 398
 399         /* See if a priority mapping exists.. */
 400         mp = vlan->egress_priority_map[skb_prio & 0xF];
 401         while (mp) {
 402                 if (mp->priority == skb_prio) {
 403                         if (mp->vlan_qos && !vlan_qos)
 404                                 vlan->nr_egress_mappings--;
 405                         else if (!mp->vlan_qos && vlan_qos)
 406                                 vlan->nr_egress_mappings++;
 407                         mp->vlan_qos = vlan_qos;
 408                         return 0;
 409                 }
 410                 mp = mp->next;
 411         }
 412
 413         /* Create a new mapping then. */
 414         mp = vlan->egress_priority_map[skb_prio & 0xF];
 415         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 416         if (!np)
 417                 return -ENOBUFS;
 418
 419         np->next = mp;
 420         np->priority = skb_prio;
 421         np->vlan_qos = vlan_qos;
 422         vlan->egress_priority_map[skb_prio & 0xF] = np;
 423         if (vlan_qos)
 424                 vlan->nr_egress_mappings++;
 425         return 0;
 426 }
 427
 428 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 429 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 430 {
 431         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 432         u32 old_flags = vlan->flags;
 433
 434         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 435                      VLAN_FLAG_LOOSE_BINDING))
 436                 return -EINVAL;
 437
 438         vlan->flags = (old_flags & ~mask) | (flags & mask);
 439
 440         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 441                 if (vlan->flags & VLAN_FLAG_GVRP)
 442                         vlan_gvrp_request_join(dev);
 443                 else
 444                         vlan_gvrp_request_leave(dev);
 445         }
 446         return 0;
 447 }
 448
 449 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 450 {
 451         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 452 }
 453
 454 static int vlan_dev_open(struct net_device *dev)
 455 {
 456         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 457         struct net_device *real_dev = vlan->real_dev;
 458         int err;
 459
 460         if (!(real_dev->flags & IFF_UP) &&
 461             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 462                 return -ENETDOWN;
 463
 464         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 465                 err = dev_unicast_add(real_dev, dev->dev_addr);
 466                 if (err < 0)
 467                         goto out;
 468         }
 469
 470         if (dev->flags & IFF_ALLMULTI) {
 471                 err = dev_set_allmulti(real_dev, 1);
 472                 if (err < 0)
 473                         goto del_unicast;
 474         }
 475         if (dev->flags & IFF_PROMISC) {
 476                 err = dev_set_promiscuity(real_dev, 1);
 477                 if (err < 0)
 478                         goto clear_allmulti;
 479         }
 480
 481         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 482
 483         if (vlan->flags & VLAN_FLAG_GVRP)
 484                 vlan_gvrp_request_join(dev);
 485
 486         netif_carrier_on(dev);
 487         return 0;
 488
 489 clear_allmulti:
 490         if (dev->flags & IFF_ALLMULTI)
 491                 dev_set_allmulti(real_dev, -1);
 492 del_unicast:
 493         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 494                 dev_unicast_delete(real_dev, dev->dev_addr);
 495 out:
 496         netif_carrier_off(dev);
 497         return err;
 498 }
 499
 500 static int vlan_dev_stop(struct net_device *dev)
 501 {
 502         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 503         struct net_device *real_dev = vlan->real_dev;
 504
 505         if (vlan->flags & VLAN_FLAG_GVRP)
 506                 vlan_gvrp_request_leave(dev);
 507
 508         dev_mc_unsync(real_dev, dev);
 509         dev_unicast_unsync(real_dev, dev);
 510         if (dev->flags & IFF_ALLMULTI)
 511                 dev_set_allmulti(real_dev, -1);
 512         if (dev->flags & IFF_PROMISC)
 513                 dev_set_promiscuity(real_dev, -1);
 514
 515         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 516                 dev_unicast_delete(real_dev, dev->dev_addr);
 517
 518         netif_carrier_off(dev);
 519         return 0;
 520 }
 521
 522 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 523 {
 524         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 525         struct sockaddr *addr = p;
 526         int err;
 527
 528         if (!is_valid_ether_addr(addr->sa_data))
 529                 return -EADDRNOTAVAIL;
 530
 531         if (!(dev->flags & IFF_UP))
 532                 goto out;
 533
 534         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 535                 err = dev_unicast_add(real_dev, addr->sa_data);
 536                 if (err < 0)
 537                         return err;
 538         }
 539
 540         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 541                 dev_unicast_delete(real_dev, dev->dev_addr);
 542
 543 out:
 544         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 545         return 0;
 546 }
 547
 548 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 549 {
 550         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 551         const struct net_device_ops *ops = real_dev->netdev_ops;
 552         struct ifreq ifrr;
 553         int err = -EOPNOTSUPP;
 554
 555         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 556         ifrr.ifr_ifru = ifr->ifr_ifru;
 557
 558         switch (cmd) {
 559         case SIOCGMIIPHY:
 560         case SIOCGMIIREG:
 561         case SIOCSMIIREG:
 562                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 563                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 564                 break;
 565         }
 566
 567         if (!err)
 568                 ifr->ifr_ifru = ifrr.ifr_ifru;
 569
 570         return err;
 571 }
 572
 573 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 574 {
 575         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 576         const struct net_device_ops *ops = real_dev->netdev_ops;
 577         int err = 0;
 578
 579         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 580                 err = ops->ndo_neigh_setup(real_dev, pa);
 581
 582         return err;
 583 }
 584
 585 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 586 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 587                                    struct scatterlist *sgl, unsigned int sgc)
 588 {
 589         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 590         const struct net_device_ops *ops = real_dev->netdev_ops;
 591         int rc = 0;
 592
 593         if (ops->ndo_fcoe_ddp_setup)
 594                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 595
 596         return rc;
 597 }
 598
 599 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 600 {
 601         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 602         const struct net_device_ops *ops = real_dev->netdev_ops;
 603         int len = 0;
 604
 605         if (ops->ndo_fcoe_ddp_done)
 606                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 607
 608         return len;
 609 }
 610
 611 static int vlan_dev_fcoe_enable(struct net_device *dev)
 612 {
 613         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 614         const struct net_device_ops *ops = real_dev->netdev_ops;
 615         int rc = -EINVAL;
 616
 617         if (ops->ndo_fcoe_enable)
 618                 rc = ops->ndo_fcoe_enable(real_dev);
 619         return rc;
 620 }
 621
 622 static int vlan_dev_fcoe_disable(struct net_device *dev)
 623 {
 624         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 625         const struct net_device_ops *ops = real_dev->netdev_ops;
 626         int rc = -EINVAL;
 627
 628         if (ops->ndo_fcoe_disable)
 629                 rc = ops->ndo_fcoe_disable(real_dev);
 630         return rc;
 631 }
 632
 633 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 634 {
 635         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 636         const struct net_device_ops *ops = real_dev->netdev_ops;
 637         int rc = -EINVAL;
 638
 639         if (ops->ndo_fcoe_get_wwn)
 640                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 641         return rc;
 642 }
 643 #endif
 644
 645 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 646 {
 647         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 648
 649         if (change & IFF_ALLMULTI)
 650                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 651         if (change & IFF_PROMISC)
 652                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 653 }
 654
 655 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 656 {
 657         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 658         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 659 }
 660
 661 /*
 662  * vlan network devices have devices nesting below it, and are a special
 663  * "super class" of normal network devices; split their locks off into a
 664  * separate class since they always nest.
 665  */
 666 static struct lock_class_key vlan_netdev_xmit_lock_key;
 667 static struct lock_class_key vlan_netdev_addr_lock_key;
 668
 669 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 670                                      struct netdev_queue *txq,
 671                                      void *_subclass)
 672 {
 673         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 674                                        &vlan_netdev_xmit_lock_key,
 675                                        *(int *)_subclass);
 676 }
 677
 678 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 679 {
 680         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 681                                        &vlan_netdev_addr_lock_key,
 682                                        subclass);
 683         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 684 }
 685
 686 static const struct header_ops vlan_header_ops = {
 687         .create  = vlan_dev_hard_header,
 688         .rebuild = vlan_dev_rebuild_header,
 689         .parse   = eth_header_parse,
 690 };
 691
 692 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
 693
 694 static int vlan_dev_init(struct net_device *dev)
 695 {
 696         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 697         int subclass = 0;
 698
 699         netif_carrier_off(dev);
 700
 701         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 702         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 703         dev->iflink = real_dev->ifindex;
 704         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 705                                           (1<<__LINK_STATE_DORMANT))) |
 706                       (1<<__LINK_STATE_PRESENT);
 707
 708         dev->features |= real_dev->features & real_dev->vlan_features;
 709         dev->gso_max_size = real_dev->gso_max_size;
 710
 711         /* ipv6 shared card related stuff */
 712         dev->dev_id = real_dev->dev_id;
 713
 714         if (is_zero_ether_addr(dev->dev_addr))
 715                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 716         if (is_zero_ether_addr(dev->broadcast))
 717                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 718
 719 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 720         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 721 #endif
 722
 723         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 724                 dev->header_ops      = real_dev->header_ops;
 725                 dev->hard_header_len = real_dev->hard_header_len;
 726                 dev->netdev_ops         = &vlan_netdev_accel_ops;
 727         } else {
 728                 dev->header_ops      = &vlan_header_ops;
 729                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 730                 dev->netdev_ops         = &vlan_netdev_ops;
 731         }
 732
 733         if (is_vlan_dev(real_dev))
 734                 subclass = 1;
 735
 736         vlan_dev_set_lockdep_class(dev, subclass);
 737
 738         vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats);
 739         if (!vlan_dev_info(dev)->vlan_rx_stats)
 740                 return -ENOMEM;
 741
 742         return 0;
 743 }
 744
 745 static void vlan_dev_uninit(struct net_device *dev)
 746 {
 747         struct vlan_priority_tci_mapping *pm;
 748         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 749         int i;
 750
 751         free_percpu(vlan->vlan_rx_stats);
 752         vlan->vlan_rx_stats = NULL;
 753         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 754                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 755                         vlan->egress_priority_map[i] = pm->next;
 756                         kfree(pm);
 757                 }
 758         }
 759 }
 760
 761 static int vlan_ethtool_get_settings(struct net_device *dev,
 762                                      struct ethtool_cmd *cmd)
 763 {
 764         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 765         return dev_ethtool_get_settings(vlan->real_dev, cmd);
 766 }
 767
 768 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 769                                      struct ethtool_drvinfo *info)
 770 {
 771         strcpy(info->driver, vlan_fullname);
 772         strcpy(info->version, vlan_version);
 773         strcpy(info->fw_version, "N/A");
 774 }
 775
 776 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 777 {
 778         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 779         return dev_ethtool_get_rx_csum(vlan->real_dev);
 780 }
 781
 782 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 783 {
 784         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 785         return dev_ethtool_get_flags(vlan->real_dev);
 786 }
 787
 788 static struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
 789 {
 790         struct net_device_stats *stats = &dev->stats;
 791
 792         dev_txq_stats_fold(dev, stats);
 793
 794         if (vlan_dev_info(dev)->vlan_rx_stats) {
 795                 struct vlan_rx_stats *p, rx = {0};
 796                 int i;
 797
 798                 for_each_possible_cpu(i) {
 799                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i);
 800                         rx.rx_packets += p->rx_packets;
 801                         rx.rx_bytes   += p->rx_bytes;
 802                         rx.rx_errors  += p->rx_errors;
 803                         rx.multicast  += p->multicast;
 804                 }
 805                 stats->rx_packets = rx.rx_packets;
 806                 stats->rx_bytes   = rx.rx_bytes;
 807                 stats->rx_errors  = rx.rx_errors;
 808                 stats->multicast  = rx.multicast;
 809         }
 810         return stats;
 811 }
 812
 813 static const struct ethtool_ops vlan_ethtool_ops = {
 814         .get_settings           = vlan_ethtool_get_settings,
 815         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 816         .get_link               = ethtool_op_get_link,
 817         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 818         .get_flags              = vlan_ethtool_get_flags,
 819 };
 820
 821 static const struct net_device_ops vlan_netdev_ops = {
 822         .ndo_change_mtu         = vlan_dev_change_mtu,
 823         .ndo_init               = vlan_dev_init,
 824         .ndo_uninit             = vlan_dev_uninit,
 825         .ndo_open               = vlan_dev_open,
 826         .ndo_stop               = vlan_dev_stop,
 827         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 828         .ndo_validate_addr      = eth_validate_addr,
 829         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 830         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 831         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 832         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 833         .ndo_do_ioctl           = vlan_dev_ioctl,
 834         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 835         .ndo_get_stats          = vlan_dev_get_stats,
 836 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 837         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 838         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 839         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 840         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 841         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 842 #endif
 843 };
 844
 845 static const struct net_device_ops vlan_netdev_accel_ops = {
 846         .ndo_change_mtu         = vlan_dev_change_mtu,
 847         .ndo_init               = vlan_dev_init,
 848         .ndo_uninit             = vlan_dev_uninit,
 849         .ndo_open               = vlan_dev_open,
 850         .ndo_stop               = vlan_dev_stop,
 851         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 852         .ndo_validate_addr      = eth_validate_addr,
 853         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 854         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 855         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 856         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 857         .ndo_do_ioctl           = vlan_dev_ioctl,
 858         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 859         .ndo_get_stats          = vlan_dev_get_stats,
 860 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 861         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 862         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 863         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 864         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 865         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 866 #endif
 867 };
 868
 869 void vlan_setup(struct net_device *dev)
 870 {
 871         ether_setup(dev);
 872
 873         dev->priv_flags         |= IFF_802_1Q_VLAN;
 874         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 875         dev->tx_queue_len       = 0;
 876
 877         dev->netdev_ops         = &vlan_netdev_ops;
 878         dev->destructor         = free_netdev;
 879         dev->ethtool_ops        = &vlan_ethtool_ops;
 880
 881         memset(dev->broadcast, 0, ETH_ALEN);
 882 }