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/slab.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/ethtool.h>
  29 #include <net/arp.h>
  30
  31 #include "vlan.h"
  32 #include "vlanproc.h"
  33 #include <linux/if_vlan.h>
  34
  35 /*
  36  *      Rebuild the Ethernet MAC header. This is called after an ARP
  37  *      (or in future other address resolution) has completed on this
  38  *      sk_buff. We now let ARP fill in the other fields.
  39  *
  40  *      This routine CANNOT use cached dst->neigh!
  41  *      Really, it is used only when dst->neigh is wrong.
  42  *
  43  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  44  */
  45 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  46 {
  47         struct net_device *dev = skb->dev;
  48         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  49
  50         switch (veth->h_vlan_encapsulated_proto) {
  51 #ifdef CONFIG_INET
  52         case htons(ETH_P_IP):
  53
  54                 /* TODO:  Confirm this will work with VLAN headers... */
  55                 return arp_find(veth->h_dest, skb);
  56 #endif
  57         default:
  58                 pr_debug("%s: unable to resolve type %X addresses.\n",
  59                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  60
  61                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  62                 break;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
  69 {
  70         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
  71                 if (skb_cow(skb, skb_headroom(skb)) < 0)
  72                         skb = NULL;
  73                 if (skb) {
  74                         /* Lifted from Gleb's VLAN code... */
  75                         memmove(skb->data - ETH_HLEN,
  76                                 skb->data - VLAN_ETH_HLEN, 12);
  77                         skb->mac_header += VLAN_HLEN;
  78                 }
  79         }
  80
  81         return skb;
  82 }
  83
  84 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  85                 struct vlan_hdr *vhdr)
  86 {
  87         __be16 proto;
  88         unsigned char *rawp;
  89
  90         /*
  91          * Was a VLAN packet, grab the encapsulated protocol, which the layer
  92          * three protocols care about.
  93          */
  94
  95         proto = vhdr->h_vlan_encapsulated_proto;
  96         if (ntohs(proto) >= 1536) {
  97                 skb->protocol = proto;
  98                 return;
  99         }
 100
 101         rawp = skb->data;
 102         if (*(unsigned short *)rawp == 0xFFFF)
 103                 /*
 104                  * This is a magic hack to spot IPX packets. Older Novell
 105                  * breaks the protocol design and runs IPX over 802.3 without
 106                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 107                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 108                  * but does for the rest.
 109                  */
 110                 skb->protocol = htons(ETH_P_802_3);
 111         else
 112                 /*
 113                  * Real 802.2 LLC
 114                  */
 115                 skb->protocol = htons(ETH_P_802_2);
 116 }
 117
 118 /*
 119  *      Determine the packet's protocol ID. The rule here is that we
 120  *      assume 802.3 if the type field is short enough to be a length.
 121  *      This is normal practice and works for any 'now in use' protocol.
 122  *
 123  *  Also, at this point we assume that we ARE dealing exclusively with
 124  *  VLAN packets, or packets that should be made into VLAN packets based
 125  *  on a default VLAN ID.
 126  *
 127  *  NOTE:  Should be similar to ethernet/eth.c.
 128  *
 129  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 130  *                towards userland.  To get here, it would have already passed
 131  *                through the ethernet/eth.c eth_type_trans() method.
 132  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 133  *                 stored UNALIGNED in the memory.  RISC systems don't like
 134  *                 such cases very much...
 135  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 136  *                  aligned, so there doesn't need to be any of the unaligned
 137  *                  stuff.  It has been commented out now...  --Ben
 138  *
 139  */
 140 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 141                   struct packet_type *ptype, struct net_device *orig_dev)
 142 {
 143         struct vlan_hdr *vhdr;
 144         struct vlan_rx_stats *rx_stats;
 145         u16 vlan_id;
 146         u16 vlan_tci;
 147
 148         skb = skb_share_check(skb, GFP_ATOMIC);
 149         if (skb == NULL)
 150                 goto err_free;
 151
 152         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 153                 goto err_free;
 154
 155         vhdr = (struct vlan_hdr *)skb->data;
 156         vlan_tci = ntohs(vhdr->h_vlan_TCI);
 157         vlan_id = vlan_tci & VLAN_VID_MASK;
 158
 159         rcu_read_lock();
 160         skb->dev = __find_vlan_dev(dev, vlan_id);
 161         if (!skb->dev) {
 162                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 163                          __func__, vlan_id, dev->name);
 164                 goto err_unlock;
 165         }
 166
 167         rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
 168                                smp_processor_id());
 169         u64_stats_update_begin(&rx_stats->syncp);
 170         rx_stats->rx_packets++;
 171         rx_stats->rx_bytes += skb->len;
 172
 173         skb_pull_rcsum(skb, VLAN_HLEN);
 174
 175         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 176
 177         pr_debug("%s: priority: %u for TCI: %hu\n",
 178                  __func__, skb->priority, vlan_tci);
 179
 180         switch (skb->pkt_type) {
 181         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 182                 /* stats->broadcast ++; // no such counter :-( */
 183                 break;
 184
 185         case PACKET_MULTICAST:
 186                 rx_stats->rx_multicast++;
 187                 break;
 188
 189         case PACKET_OTHERHOST:
 190                 /* Our lower layer thinks this is not local, let's make sure.
 191                  * This allows the VLAN to have a different MAC than the
 192                  * underlying device, and still route correctly.
 193                  */
 194                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 195                                         skb->dev->dev_addr))
 196                         skb->pkt_type = PACKET_HOST;
 197                 break;
 198         default:
 199                 break;
 200         }
 201         u64_stats_update_end(&rx_stats->syncp);
 202
 203         vlan_set_encap_proto(skb, vhdr);
 204
 205         skb = vlan_check_reorder_header(skb);
 206         if (!skb) {
 207                 rx_stats->rx_errors++;
 208                 goto err_unlock;
 209         }
 210
 211         netif_rx(skb);
 212         rcu_read_unlock();
 213         return NET_RX_SUCCESS;
 214
 215 err_unlock:
 216         rcu_read_unlock();
 217 err_free:
 218         kfree_skb(skb);
 219         return NET_RX_DROP;
 220 }
 221
 222 static inline u16
 223 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 224 {
 225         struct vlan_priority_tci_mapping *mp;
 226
 227         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 228         while (mp) {
 229                 if (mp->priority == skb->priority) {
 230                         return mp->vlan_qos; /* This should already be shifted
 231                                               * to mask correctly with the
 232                                               * VLAN's TCI */
 233                 }
 234                 mp = mp->next;
 235         }
 236         return 0;
 237 }
 238
 239 /*
 240  *      Create the VLAN header for an arbitrary protocol layer
 241  *
 242  *      saddr=NULL      means use device source address
 243  *      daddr=NULL      means leave destination address (eg unresolved arp)
 244  *
 245  *  This is called when the SKB is moving down the stack towards the
 246  *  physical devices.
 247  */
 248 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 249                                 unsigned short type,
 250                                 const void *daddr, const void *saddr,
 251                                 unsigned int len)
 252 {
 253         struct vlan_hdr *vhdr;
 254         unsigned int vhdrlen = 0;
 255         u16 vlan_tci = 0;
 256         int rc;
 257
 258         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 259                 return -ENOSPC;
 260
 261         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 262                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 263
 264                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 265                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 266                 vhdr->h_vlan_TCI = htons(vlan_tci);
 267
 268                 /*
 269                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 270                  *  put the length in here instead.
 271                  */
 272                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 273                         vhdr->h_vlan_encapsulated_proto = htons(type);
 274                 else
 275                         vhdr->h_vlan_encapsulated_proto = htons(len);
 276
 277                 skb->protocol = htons(ETH_P_8021Q);
 278                 type = ETH_P_8021Q;
 279                 vhdrlen = VLAN_HLEN;
 280         }
 281
 282         /* Before delegating work to the lower layer, enter our MAC-address */
 283         if (saddr == NULL)
 284                 saddr = dev->dev_addr;
 285
 286         /* Now make the underlying real hard header */
 287         dev = vlan_dev_info(dev)->real_dev;
 288         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 289         if (rc > 0)
 290                 rc += vhdrlen;
 291         return rc;
 292 }
 293
 294 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 295                                             struct net_device *dev)
 296 {
 297         int i = skb_get_queue_mapping(skb);
 298         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 299         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 300         unsigned int len;
 301         int ret;
 302
 303         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 304          *
 305          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 306          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 307          */
 308         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 309             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 310                 unsigned int orig_headroom = skb_headroom(skb);
 311                 u16 vlan_tci;
 312
 313                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 314
 315                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 316                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 317                 skb = __vlan_put_tag(skb, vlan_tci);
 318                 if (!skb) {
 319                         txq->tx_dropped++;
 320                         return NETDEV_TX_OK;
 321                 }
 322
 323                 if (orig_headroom < VLAN_HLEN)
 324                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 325         }
 326
 327
 328         skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
 329         len = skb->len;
 330         ret = dev_queue_xmit(skb);
 331
 332         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 333                 txq->tx_packets++;
 334                 txq->tx_bytes += len;
 335         } else
 336                 txq->tx_dropped++;
 337
 338         return ret;
 339 }
 340
 341 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 342                                                     struct net_device *dev)
 343 {
 344         int i = skb_get_queue_mapping(skb);
 345         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 346         u16 vlan_tci;
 347         unsigned int len;
 348         int ret;
 349
 350         vlan_tci = vlan_dev_info(dev)->vlan_id;
 351         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 352         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 353
 354         skb->dev = vlan_dev_info(dev)->real_dev;
 355         len = skb->len;
 356         ret = dev_queue_xmit(skb);
 357
 358         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 359                 txq->tx_packets++;
 360                 txq->tx_bytes += len;
 361         } else
 362                 txq->tx_dropped++;
 363
 364         return ret;
 365 }
 366
 367 static u16 vlan_dev_select_queue(struct net_device *dev, struct sk_buff *skb)
 368 {
 369         struct net_device *rdev = vlan_dev_info(dev)->real_dev;
 370         const struct net_device_ops *ops = rdev->netdev_ops;
 371
 372         return ops->ndo_select_queue(rdev, skb);
 373 }
 374
 375 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 376 {
 377         /* TODO: gotta make sure the underlying layer can handle it,
 378          * maybe an IFF_VLAN_CAPABLE flag for devices?
 379          */
 380         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 381                 return -ERANGE;
 382
 383         dev->mtu = new_mtu;
 384
 385         return 0;
 386 }
 387
 388 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 389                                    u32 skb_prio, u16 vlan_prio)
 390 {
 391         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 392
 393         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 394                 vlan->nr_ingress_mappings--;
 395         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 396                 vlan->nr_ingress_mappings++;
 397
 398         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 399 }
 400
 401 int vlan_dev_set_egress_priority(const struct net_device *dev,
 402                                  u32 skb_prio, u16 vlan_prio)
 403 {
 404         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 405         struct vlan_priority_tci_mapping *mp = NULL;
 406         struct vlan_priority_tci_mapping *np;
 407         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 408
 409         /* See if a priority mapping exists.. */
 410         mp = vlan->egress_priority_map[skb_prio & 0xF];
 411         while (mp) {
 412                 if (mp->priority == skb_prio) {
 413                         if (mp->vlan_qos && !vlan_qos)
 414                                 vlan->nr_egress_mappings--;
 415                         else if (!mp->vlan_qos && vlan_qos)
 416                                 vlan->nr_egress_mappings++;
 417                         mp->vlan_qos = vlan_qos;
 418                         return 0;
 419                 }
 420                 mp = mp->next;
 421         }
 422
 423         /* Create a new mapping then. */
 424         mp = vlan->egress_priority_map[skb_prio & 0xF];
 425         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 426         if (!np)
 427                 return -ENOBUFS;
 428
 429         np->next = mp;
 430         np->priority = skb_prio;
 431         np->vlan_qos = vlan_qos;
 432         vlan->egress_priority_map[skb_prio & 0xF] = np;
 433         if (vlan_qos)
 434                 vlan->nr_egress_mappings++;
 435         return 0;
 436 }
 437
 438 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 439 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 440 {
 441         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 442         u32 old_flags = vlan->flags;
 443
 444         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 445                      VLAN_FLAG_LOOSE_BINDING))
 446                 return -EINVAL;
 447
 448         vlan->flags = (old_flags & ~mask) | (flags & mask);
 449
 450         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 451                 if (vlan->flags & VLAN_FLAG_GVRP)
 452                         vlan_gvrp_request_join(dev);
 453                 else
 454                         vlan_gvrp_request_leave(dev);
 455         }
 456         return 0;
 457 }
 458
 459 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 460 {
 461         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 462 }
 463
 464 static int vlan_dev_open(struct net_device *dev)
 465 {
 466         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 467         struct net_device *real_dev = vlan->real_dev;
 468         int err;
 469
 470         if (!(real_dev->flags & IFF_UP) &&
 471             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 472                 return -ENETDOWN;
 473
 474         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 475                 err = dev_uc_add(real_dev, dev->dev_addr);
 476                 if (err < 0)
 477                         goto out;
 478         }
 479
 480         if (dev->flags & IFF_ALLMULTI) {
 481                 err = dev_set_allmulti(real_dev, 1);
 482                 if (err < 0)
 483                         goto del_unicast;
 484         }
 485         if (dev->flags & IFF_PROMISC) {
 486                 err = dev_set_promiscuity(real_dev, 1);
 487                 if (err < 0)
 488                         goto clear_allmulti;
 489         }
 490
 491         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 492
 493         if (vlan->flags & VLAN_FLAG_GVRP)
 494                 vlan_gvrp_request_join(dev);
 495
 496         netif_carrier_on(dev);
 497         return 0;
 498
 499 clear_allmulti:
 500         if (dev->flags & IFF_ALLMULTI)
 501                 dev_set_allmulti(real_dev, -1);
 502 del_unicast:
 503         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 504                 dev_uc_del(real_dev, dev->dev_addr);
 505 out:
 506         netif_carrier_off(dev);
 507         return err;
 508 }
 509
 510 static int vlan_dev_stop(struct net_device *dev)
 511 {
 512         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 513         struct net_device *real_dev = vlan->real_dev;
 514
 515         if (vlan->flags & VLAN_FLAG_GVRP)
 516                 vlan_gvrp_request_leave(dev);
 517
 518         dev_mc_unsync(real_dev, dev);
 519         dev_uc_unsync(real_dev, dev);
 520         if (dev->flags & IFF_ALLMULTI)
 521                 dev_set_allmulti(real_dev, -1);
 522         if (dev->flags & IFF_PROMISC)
 523                 dev_set_promiscuity(real_dev, -1);
 524
 525         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 526                 dev_uc_del(real_dev, dev->dev_addr);
 527
 528         netif_carrier_off(dev);
 529         return 0;
 530 }
 531
 532 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 533 {
 534         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 535         struct sockaddr *addr = p;
 536         int err;
 537
 538         if (!is_valid_ether_addr(addr->sa_data))
 539                 return -EADDRNOTAVAIL;
 540
 541         if (!(dev->flags & IFF_UP))
 542                 goto out;
 543
 544         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 545                 err = dev_uc_add(real_dev, addr->sa_data);
 546                 if (err < 0)
 547                         return err;
 548         }
 549
 550         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 551                 dev_uc_del(real_dev, dev->dev_addr);
 552
 553 out:
 554         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 555         return 0;
 556 }
 557
 558 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 559 {
 560         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 561         const struct net_device_ops *ops = real_dev->netdev_ops;
 562         struct ifreq ifrr;
 563         int err = -EOPNOTSUPP;
 564
 565         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 566         ifrr.ifr_ifru = ifr->ifr_ifru;
 567
 568         switch (cmd) {
 569         case SIOCGMIIPHY:
 570         case SIOCGMIIREG:
 571         case SIOCSMIIREG:
 572                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 573                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 574                 break;
 575         }
 576
 577         if (!err)
 578                 ifr->ifr_ifru = ifrr.ifr_ifru;
 579
 580         return err;
 581 }
 582
 583 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 584 {
 585         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 586         const struct net_device_ops *ops = real_dev->netdev_ops;
 587         int err = 0;
 588
 589         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 590                 err = ops->ndo_neigh_setup(real_dev, pa);
 591
 592         return err;
 593 }
 594
 595 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 596 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 597                                    struct scatterlist *sgl, unsigned int sgc)
 598 {
 599         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 600         const struct net_device_ops *ops = real_dev->netdev_ops;
 601         int rc = 0;
 602
 603         if (ops->ndo_fcoe_ddp_setup)
 604                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 605
 606         return rc;
 607 }
 608
 609 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 610 {
 611         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 612         const struct net_device_ops *ops = real_dev->netdev_ops;
 613         int len = 0;
 614
 615         if (ops->ndo_fcoe_ddp_done)
 616                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 617
 618         return len;
 619 }
 620
 621 static int vlan_dev_fcoe_enable(struct net_device *dev)
 622 {
 623         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 624         const struct net_device_ops *ops = real_dev->netdev_ops;
 625         int rc = -EINVAL;
 626
 627         if (ops->ndo_fcoe_enable)
 628                 rc = ops->ndo_fcoe_enable(real_dev);
 629         return rc;
 630 }
 631
 632 static int vlan_dev_fcoe_disable(struct net_device *dev)
 633 {
 634         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 635         const struct net_device_ops *ops = real_dev->netdev_ops;
 636         int rc = -EINVAL;
 637
 638         if (ops->ndo_fcoe_disable)
 639                 rc = ops->ndo_fcoe_disable(real_dev);
 640         return rc;
 641 }
 642
 643 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 644 {
 645         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 646         const struct net_device_ops *ops = real_dev->netdev_ops;
 647         int rc = -EINVAL;
 648
 649         if (ops->ndo_fcoe_get_wwn)
 650                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 651         return rc;
 652 }
 653 #endif
 654
 655 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 656 {
 657         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 658
 659         if (change & IFF_ALLMULTI)
 660                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 661         if (change & IFF_PROMISC)
 662                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 663 }
 664
 665 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 666 {
 667         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 668         dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 669 }
 670
 671 /*
 672  * vlan network devices have devices nesting below it, and are a special
 673  * "super class" of normal network devices; split their locks off into a
 674  * separate class since they always nest.
 675  */
 676 static struct lock_class_key vlan_netdev_xmit_lock_key;
 677 static struct lock_class_key vlan_netdev_addr_lock_key;
 678
 679 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 680                                      struct netdev_queue *txq,
 681                                      void *_subclass)
 682 {
 683         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 684                                        &vlan_netdev_xmit_lock_key,
 685                                        *(int *)_subclass);
 686 }
 687
 688 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 689 {
 690         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 691                                        &vlan_netdev_addr_lock_key,
 692                                        subclass);
 693         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 694 }
 695
 696 static const struct header_ops vlan_header_ops = {
 697         .create  = vlan_dev_hard_header,
 698         .rebuild = vlan_dev_rebuild_header,
 699         .parse   = eth_header_parse,
 700 };
 701
 702 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops,
 703                     vlan_netdev_ops_sq, vlan_netdev_accel_ops_sq;
 704
 705 static int vlan_dev_init(struct net_device *dev)
 706 {
 707         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 708         int subclass = 0;
 709
 710         netif_carrier_off(dev);
 711
 712         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 713         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 714                                           IFF_MASTER | IFF_SLAVE);
 715         dev->iflink = real_dev->ifindex;
 716         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 717                                           (1<<__LINK_STATE_DORMANT))) |
 718                       (1<<__LINK_STATE_PRESENT);
 719
 720         dev->features |= real_dev->features & real_dev->vlan_features;
 721         dev->gso_max_size = real_dev->gso_max_size;
 722
 723         /* ipv6 shared card related stuff */
 724         dev->dev_id = real_dev->dev_id;
 725
 726         if (is_zero_ether_addr(dev->dev_addr))
 727                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 728         if (is_zero_ether_addr(dev->broadcast))
 729                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 730
 731 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 732         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 733 #endif
 734
 735         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 736                 dev->header_ops      = real_dev->header_ops;
 737                 dev->hard_header_len = real_dev->hard_header_len;
 738                 if (real_dev->netdev_ops->ndo_select_queue)
 739                         dev->netdev_ops = &vlan_netdev_accel_ops_sq;
 740                 else
 741                         dev->netdev_ops = &vlan_netdev_accel_ops;
 742         } else {
 743                 dev->header_ops      = &vlan_header_ops;
 744                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 745                 if (real_dev->netdev_ops->ndo_select_queue)
 746                         dev->netdev_ops = &vlan_netdev_ops_sq;
 747                 else
 748                         dev->netdev_ops = &vlan_netdev_ops;
 749         }
 750
 751         if (is_vlan_dev(real_dev))
 752                 subclass = 1;
 753
 754         vlan_dev_set_lockdep_class(dev, subclass);
 755
 756         vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats);
 757         if (!vlan_dev_info(dev)->vlan_rx_stats)
 758                 return -ENOMEM;
 759
 760         return 0;
 761 }
 762
 763 static void vlan_dev_uninit(struct net_device *dev)
 764 {
 765         struct vlan_priority_tci_mapping *pm;
 766         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 767         int i;
 768
 769         free_percpu(vlan->vlan_rx_stats);
 770         vlan->vlan_rx_stats = NULL;
 771         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 772                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 773                         vlan->egress_priority_map[i] = pm->next;
 774                         kfree(pm);
 775                 }
 776         }
 777 }
 778
 779 static int vlan_ethtool_get_settings(struct net_device *dev,
 780                                      struct ethtool_cmd *cmd)
 781 {
 782         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 783         return dev_ethtool_get_settings(vlan->real_dev, cmd);
 784 }
 785
 786 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 787                                      struct ethtool_drvinfo *info)
 788 {
 789         strcpy(info->driver, vlan_fullname);
 790         strcpy(info->version, vlan_version);
 791         strcpy(info->fw_version, "N/A");
 792 }
 793
 794 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 795 {
 796         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 797         return dev_ethtool_get_rx_csum(vlan->real_dev);
 798 }
 799
 800 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 801 {
 802         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 803         return dev_ethtool_get_flags(vlan->real_dev);
 804 }
 805
 806 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 807 {
 808         dev_txq_stats_fold(dev, (struct net_device_stats *)stats);
 809
 810         if (vlan_dev_info(dev)->vlan_rx_stats) {
 811                 struct vlan_rx_stats *p, accum = {0};
 812                 int i;
 813
 814                 for_each_possible_cpu(i) {
 815                         u64 rxpackets, rxbytes, rxmulticast;
 816                         unsigned int start;
 817
 818                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i);
 819                         do {
 820                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 821                                 rxpackets       = p->rx_packets;
 822                                 rxbytes         = p->rx_bytes;
 823                                 rxmulticast     = p->rx_multicast;
 824                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 825                         accum.rx_packets += rxpackets;
 826                         accum.rx_bytes   += rxbytes;
 827                         accum.rx_multicast += rxmulticast;
 828                         /* rx_errors is an ulong, not protected by syncp */
 829                         accum.rx_errors  += p->rx_errors;
 830                 }
 831                 stats->rx_packets = accum.rx_packets;
 832                 stats->rx_bytes   = accum.rx_bytes;
 833                 stats->rx_errors  = accum.rx_errors;
 834                 stats->multicast  = accum.rx_multicast;
 835         }
 836         return stats;
 837 }
 838
 839 static const struct ethtool_ops vlan_ethtool_ops = {
 840         .get_settings           = vlan_ethtool_get_settings,
 841         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 842         .get_link               = ethtool_op_get_link,
 843         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 844         .get_flags              = vlan_ethtool_get_flags,
 845 };
 846
 847 static const struct net_device_ops vlan_netdev_ops = {
 848         .ndo_change_mtu         = vlan_dev_change_mtu,
 849         .ndo_init               = vlan_dev_init,
 850         .ndo_uninit             = vlan_dev_uninit,
 851         .ndo_open               = vlan_dev_open,
 852         .ndo_stop               = vlan_dev_stop,
 853         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 854         .ndo_validate_addr      = eth_validate_addr,
 855         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 856         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 857         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 858         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 859         .ndo_do_ioctl           = vlan_dev_ioctl,
 860         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 861         .ndo_get_stats64        = vlan_dev_get_stats64,
 862 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 863         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 864         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 865         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 866         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 867         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 868 #endif
 869 };
 870
 871 static const struct net_device_ops vlan_netdev_accel_ops = {
 872         .ndo_change_mtu         = vlan_dev_change_mtu,
 873         .ndo_init               = vlan_dev_init,
 874         .ndo_uninit             = vlan_dev_uninit,
 875         .ndo_open               = vlan_dev_open,
 876         .ndo_stop               = vlan_dev_stop,
 877         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 878         .ndo_validate_addr      = eth_validate_addr,
 879         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 880         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 881         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 882         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 883         .ndo_do_ioctl           = vlan_dev_ioctl,
 884         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 885         .ndo_get_stats64        = vlan_dev_get_stats64,
 886 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 887         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 888         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 889         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 890         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 891         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 892 #endif
 893 };
 894
 895 static const struct net_device_ops vlan_netdev_ops_sq = {
 896         .ndo_select_queue       = vlan_dev_select_queue,
 897         .ndo_change_mtu         = vlan_dev_change_mtu,
 898         .ndo_init               = vlan_dev_init,
 899         .ndo_uninit             = vlan_dev_uninit,
 900         .ndo_open               = vlan_dev_open,
 901         .ndo_stop               = vlan_dev_stop,
 902         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 903         .ndo_validate_addr      = eth_validate_addr,
 904         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 905         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 906         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 907         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 908         .ndo_do_ioctl           = vlan_dev_ioctl,
 909         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 910         .ndo_get_stats64        = vlan_dev_get_stats64,
 911 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 912         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 913         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 914         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 915         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 916         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 917 #endif
 918 };
 919
 920 static const struct net_device_ops vlan_netdev_accel_ops_sq = {
 921         .ndo_select_queue       = vlan_dev_select_queue,
 922         .ndo_change_mtu         = vlan_dev_change_mtu,
 923         .ndo_init               = vlan_dev_init,
 924         .ndo_uninit             = vlan_dev_uninit,
 925         .ndo_open               = vlan_dev_open,
 926         .ndo_stop               = vlan_dev_stop,
 927         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 928         .ndo_validate_addr      = eth_validate_addr,
 929         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 930         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 931         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 932         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 933         .ndo_do_ioctl           = vlan_dev_ioctl,
 934         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 935         .ndo_get_stats64        = vlan_dev_get_stats64,
 936 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 937         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 938         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 939         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 940         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 941         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 942 #endif
 943 };
 944
 945 void vlan_setup(struct net_device *dev)
 946 {
 947         ether_setup(dev);
 948
 949         dev->priv_flags         |= IFF_802_1Q_VLAN;
 950         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 951         dev->tx_queue_len       = 0;
 952
 953         dev->netdev_ops         = &vlan_netdev_ops;
 954         dev->destructor         = free_netdev;
 955         dev->ethtool_ops        = &vlan_ethtool_ops;
 956
 957         memset(dev->broadcast, 0, ETH_ALEN);
 958 }