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_pcpu_stats *rx_stats;
 145         struct net_device *vlan_dev;
 146         u16 vlan_id;
 147         u16 vlan_tci;
 148
 149         skb = skb_share_check(skb, GFP_ATOMIC);
 150         if (skb == NULL)
 151                 goto err_free;
 152
 153         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 154                 goto err_free;
 155
 156         vhdr = (struct vlan_hdr *)skb->data;
 157         vlan_tci = ntohs(vhdr->h_vlan_TCI);
 158         vlan_id = vlan_tci & VLAN_VID_MASK;
 159
 160         rcu_read_lock();
 161         vlan_dev = vlan_find_dev(dev, vlan_id);
 162
 163         /* If the VLAN device is defined, we use it.
 164          * If not, and the VID is 0, it is a 802.1p packet (not
 165          * really a VLAN), so we will just netif_rx it later to the
 166          * original interface, but with the skb->proto set to the
 167          * wrapped proto: we do nothing here.
 168          */
 169
 170         if (!vlan_dev) {
 171                 if (vlan_id) {
 172                         pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 173                                  __func__, vlan_id, dev->name);
 174                         goto err_unlock;
 175                 }
 176                 rx_stats = NULL;
 177         } else {
 178                 skb->dev = vlan_dev;
 179
 180                 rx_stats = this_cpu_ptr(vlan_dev_info(skb->dev)->vlan_pcpu_stats);
 181
 182                 u64_stats_update_begin(&rx_stats->syncp);
 183                 rx_stats->rx_packets++;
 184                 rx_stats->rx_bytes += skb->len;
 185
 186                 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 187
 188                 pr_debug("%s: priority: %u for TCI: %hu\n",
 189                          __func__, skb->priority, vlan_tci);
 190
 191                 switch (skb->pkt_type) {
 192                 case PACKET_BROADCAST:
 193                         /* Yeah, stats collect these together.. */
 194                         /* stats->broadcast ++; // no such counter :-( */
 195                         break;
 196
 197                 case PACKET_MULTICAST:
 198                         rx_stats->rx_multicast++;
 199                         break;
 200
 201                 case PACKET_OTHERHOST:
 202                         /* Our lower layer thinks this is not local, let's make
 203                          * sure.
 204                          * This allows the VLAN to have a different MAC than the
 205                          * underlying device, and still route correctly.
 206                          */
 207                         if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 208                                                 skb->dev->dev_addr))
 209                                 skb->pkt_type = PACKET_HOST;
 210                         break;
 211                 default:
 212                         break;
 213                 }
 214                 u64_stats_update_end(&rx_stats->syncp);
 215         }
 216
 217         skb_pull_rcsum(skb, VLAN_HLEN);
 218         vlan_set_encap_proto(skb, vhdr);
 219
 220         if (vlan_dev) {
 221                 skb = vlan_check_reorder_header(skb);
 222                 if (!skb) {
 223                         rx_stats->rx_errors++;
 224                         goto err_unlock;
 225                 }
 226         }
 227
 228         netif_rx(skb);
 229
 230         rcu_read_unlock();
 231         return NET_RX_SUCCESS;
 232
 233 err_unlock:
 234         rcu_read_unlock();
 235 err_free:
 236         atomic_long_inc(&dev->rx_dropped);
 237         kfree_skb(skb);
 238         return NET_RX_DROP;
 239 }
 240
 241 static inline u16
 242 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 243 {
 244         struct vlan_priority_tci_mapping *mp;
 245
 246         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 247         while (mp) {
 248                 if (mp->priority == skb->priority) {
 249                         return mp->vlan_qos; /* This should already be shifted
 250                                               * to mask correctly with the
 251                                               * VLAN's TCI */
 252                 }
 253                 mp = mp->next;
 254         }
 255         return 0;
 256 }
 257
 258 /*
 259  *      Create the VLAN header for an arbitrary protocol layer
 260  *
 261  *      saddr=NULL      means use device source address
 262  *      daddr=NULL      means leave destination address (eg unresolved arp)
 263  *
 264  *  This is called when the SKB is moving down the stack towards the
 265  *  physical devices.
 266  */
 267 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 268                                 unsigned short type,
 269                                 const void *daddr, const void *saddr,
 270                                 unsigned int len)
 271 {
 272         struct vlan_hdr *vhdr;
 273         unsigned int vhdrlen = 0;
 274         u16 vlan_tci = 0;
 275         int rc;
 276
 277         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 278                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 279
 280                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 281                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 282                 vhdr->h_vlan_TCI = htons(vlan_tci);
 283
 284                 /*
 285                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 286                  *  put the length in here instead.
 287                  */
 288                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 289                         vhdr->h_vlan_encapsulated_proto = htons(type);
 290                 else
 291                         vhdr->h_vlan_encapsulated_proto = htons(len);
 292
 293                 skb->protocol = htons(ETH_P_8021Q);
 294                 type = ETH_P_8021Q;
 295                 vhdrlen = VLAN_HLEN;
 296         }
 297
 298         /* Before delegating work to the lower layer, enter our MAC-address */
 299         if (saddr == NULL)
 300                 saddr = dev->dev_addr;
 301
 302         /* Now make the underlying real hard header */
 303         dev = vlan_dev_info(dev)->real_dev;
 304         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 305         if (rc > 0)
 306                 rc += vhdrlen;
 307         return rc;
 308 }
 309
 310 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 311                                             struct net_device *dev)
 312 {
 313         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 314         unsigned int len;
 315         int ret;
 316
 317         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 318          *
 319          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 320          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 321          */
 322         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 323             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 324                 u16 vlan_tci;
 325                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 326                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 327                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 328         }
 329
 330         skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
 331         len = skb->len;
 332         ret = dev_queue_xmit(skb);
 333
 334         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 335                 struct vlan_pcpu_stats *stats;
 336
 337                 stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats);
 338                 u64_stats_update_begin(&stats->syncp);
 339                 stats->tx_packets++;
 340                 stats->tx_bytes += len;
 341                 u64_stats_update_begin(&stats->syncp);
 342         } else {
 343                 this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped);
 344         }
 345
 346         return ret;
 347 }
 348
 349 static u16 vlan_dev_select_queue(struct net_device *dev, struct sk_buff *skb)
 350 {
 351         struct net_device *rdev = vlan_dev_info(dev)->real_dev;
 352         const struct net_device_ops *ops = rdev->netdev_ops;
 353
 354         return ops->ndo_select_queue(rdev, skb);
 355 }
 356
 357 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 358 {
 359         /* TODO: gotta make sure the underlying layer can handle it,
 360          * maybe an IFF_VLAN_CAPABLE flag for devices?
 361          */
 362         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 363                 return -ERANGE;
 364
 365         dev->mtu = new_mtu;
 366
 367         return 0;
 368 }
 369
 370 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 371                                    u32 skb_prio, u16 vlan_prio)
 372 {
 373         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 374
 375         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 376                 vlan->nr_ingress_mappings--;
 377         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 378                 vlan->nr_ingress_mappings++;
 379
 380         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 381 }
 382
 383 int vlan_dev_set_egress_priority(const struct net_device *dev,
 384                                  u32 skb_prio, u16 vlan_prio)
 385 {
 386         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 387         struct vlan_priority_tci_mapping *mp = NULL;
 388         struct vlan_priority_tci_mapping *np;
 389         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 390
 391         /* See if a priority mapping exists.. */
 392         mp = vlan->egress_priority_map[skb_prio & 0xF];
 393         while (mp) {
 394                 if (mp->priority == skb_prio) {
 395                         if (mp->vlan_qos && !vlan_qos)
 396                                 vlan->nr_egress_mappings--;
 397                         else if (!mp->vlan_qos && vlan_qos)
 398                                 vlan->nr_egress_mappings++;
 399                         mp->vlan_qos = vlan_qos;
 400                         return 0;
 401                 }
 402                 mp = mp->next;
 403         }
 404
 405         /* Create a new mapping then. */
 406         mp = vlan->egress_priority_map[skb_prio & 0xF];
 407         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 408         if (!np)
 409                 return -ENOBUFS;
 410
 411         np->next = mp;
 412         np->priority = skb_prio;
 413         np->vlan_qos = vlan_qos;
 414         vlan->egress_priority_map[skb_prio & 0xF] = np;
 415         if (vlan_qos)
 416                 vlan->nr_egress_mappings++;
 417         return 0;
 418 }
 419
 420 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 421 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 422 {
 423         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 424         u32 old_flags = vlan->flags;
 425
 426         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 427                      VLAN_FLAG_LOOSE_BINDING))
 428                 return -EINVAL;
 429
 430         vlan->flags = (old_flags & ~mask) | (flags & mask);
 431
 432         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 433                 if (vlan->flags & VLAN_FLAG_GVRP)
 434                         vlan_gvrp_request_join(dev);
 435                 else
 436                         vlan_gvrp_request_leave(dev);
 437         }
 438         return 0;
 439 }
 440
 441 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 442 {
 443         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 444 }
 445
 446 static int vlan_dev_open(struct net_device *dev)
 447 {
 448         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 449         struct net_device *real_dev = vlan->real_dev;
 450         int err;
 451
 452         if (!(real_dev->flags & IFF_UP) &&
 453             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 454                 return -ENETDOWN;
 455
 456         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 457                 err = dev_uc_add(real_dev, dev->dev_addr);
 458                 if (err < 0)
 459                         goto out;
 460         }
 461
 462         if (dev->flags & IFF_ALLMULTI) {
 463                 err = dev_set_allmulti(real_dev, 1);
 464                 if (err < 0)
 465                         goto del_unicast;
 466         }
 467         if (dev->flags & IFF_PROMISC) {
 468                 err = dev_set_promiscuity(real_dev, 1);
 469                 if (err < 0)
 470                         goto clear_allmulti;
 471         }
 472
 473         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 474
 475         if (vlan->flags & VLAN_FLAG_GVRP)
 476                 vlan_gvrp_request_join(dev);
 477
 478         if (netif_carrier_ok(real_dev))
 479                 netif_carrier_on(dev);
 480         return 0;
 481
 482 clear_allmulti:
 483         if (dev->flags & IFF_ALLMULTI)
 484                 dev_set_allmulti(real_dev, -1);
 485 del_unicast:
 486         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 487                 dev_uc_del(real_dev, dev->dev_addr);
 488 out:
 489         netif_carrier_off(dev);
 490         return err;
 491 }
 492
 493 static int vlan_dev_stop(struct net_device *dev)
 494 {
 495         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 496         struct net_device *real_dev = vlan->real_dev;
 497
 498         if (vlan->flags & VLAN_FLAG_GVRP)
 499                 vlan_gvrp_request_leave(dev);
 500
 501         dev_mc_unsync(real_dev, dev);
 502         dev_uc_unsync(real_dev, dev);
 503         if (dev->flags & IFF_ALLMULTI)
 504                 dev_set_allmulti(real_dev, -1);
 505         if (dev->flags & IFF_PROMISC)
 506                 dev_set_promiscuity(real_dev, -1);
 507
 508         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 509                 dev_uc_del(real_dev, dev->dev_addr);
 510
 511         netif_carrier_off(dev);
 512         return 0;
 513 }
 514
 515 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 516 {
 517         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 518         struct sockaddr *addr = p;
 519         int err;
 520
 521         if (!is_valid_ether_addr(addr->sa_data))
 522                 return -EADDRNOTAVAIL;
 523
 524         if (!(dev->flags & IFF_UP))
 525                 goto out;
 526
 527         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 528                 err = dev_uc_add(real_dev, addr->sa_data);
 529                 if (err < 0)
 530                         return err;
 531         }
 532
 533         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 534                 dev_uc_del(real_dev, dev->dev_addr);
 535
 536 out:
 537         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 538         return 0;
 539 }
 540
 541 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 542 {
 543         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 544         const struct net_device_ops *ops = real_dev->netdev_ops;
 545         struct ifreq ifrr;
 546         int err = -EOPNOTSUPP;
 547
 548         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 549         ifrr.ifr_ifru = ifr->ifr_ifru;
 550
 551         switch (cmd) {
 552         case SIOCGMIIPHY:
 553         case SIOCGMIIREG:
 554         case SIOCSMIIREG:
 555                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 556                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 557                 break;
 558         }
 559
 560         if (!err)
 561                 ifr->ifr_ifru = ifrr.ifr_ifru;
 562
 563         return err;
 564 }
 565
 566 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 567 {
 568         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 569         const struct net_device_ops *ops = real_dev->netdev_ops;
 570         int err = 0;
 571
 572         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 573                 err = ops->ndo_neigh_setup(real_dev, pa);
 574
 575         return err;
 576 }
 577
 578 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 579 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 580                                    struct scatterlist *sgl, unsigned int sgc)
 581 {
 582         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 583         const struct net_device_ops *ops = real_dev->netdev_ops;
 584         int rc = 0;
 585
 586         if (ops->ndo_fcoe_ddp_setup)
 587                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 588
 589         return rc;
 590 }
 591
 592 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 593 {
 594         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 595         const struct net_device_ops *ops = real_dev->netdev_ops;
 596         int len = 0;
 597
 598         if (ops->ndo_fcoe_ddp_done)
 599                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 600
 601         return len;
 602 }
 603
 604 static int vlan_dev_fcoe_enable(struct net_device *dev)
 605 {
 606         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 607         const struct net_device_ops *ops = real_dev->netdev_ops;
 608         int rc = -EINVAL;
 609
 610         if (ops->ndo_fcoe_enable)
 611                 rc = ops->ndo_fcoe_enable(real_dev);
 612         return rc;
 613 }
 614
 615 static int vlan_dev_fcoe_disable(struct net_device *dev)
 616 {
 617         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 618         const struct net_device_ops *ops = real_dev->netdev_ops;
 619         int rc = -EINVAL;
 620
 621         if (ops->ndo_fcoe_disable)
 622                 rc = ops->ndo_fcoe_disable(real_dev);
 623         return rc;
 624 }
 625
 626 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 627 {
 628         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 629         const struct net_device_ops *ops = real_dev->netdev_ops;
 630         int rc = -EINVAL;
 631
 632         if (ops->ndo_fcoe_get_wwn)
 633                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 634         return rc;
 635 }
 636 #endif
 637
 638 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 639 {
 640         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 641
 642         if (change & IFF_ALLMULTI)
 643                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 644         if (change & IFF_PROMISC)
 645                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 646 }
 647
 648 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 649 {
 650         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 651         dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 652 }
 653
 654 /*
 655  * vlan network devices have devices nesting below it, and are a special
 656  * "super class" of normal network devices; split their locks off into a
 657  * separate class since they always nest.
 658  */
 659 static struct lock_class_key vlan_netdev_xmit_lock_key;
 660 static struct lock_class_key vlan_netdev_addr_lock_key;
 661
 662 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 663                                      struct netdev_queue *txq,
 664                                      void *_subclass)
 665 {
 666         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 667                                        &vlan_netdev_xmit_lock_key,
 668                                        *(int *)_subclass);
 669 }
 670
 671 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 672 {
 673         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 674                                        &vlan_netdev_addr_lock_key,
 675                                        subclass);
 676         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 677 }
 678
 679 static const struct header_ops vlan_header_ops = {
 680         .create  = vlan_dev_hard_header,
 681         .rebuild = vlan_dev_rebuild_header,
 682         .parse   = eth_header_parse,
 683 };
 684
 685 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_ops_sq;
 686
 687 static int vlan_dev_init(struct net_device *dev)
 688 {
 689         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 690         int subclass = 0;
 691
 692         netif_carrier_off(dev);
 693
 694         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 695         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 696                                           IFF_MASTER | IFF_SLAVE);
 697         dev->iflink = real_dev->ifindex;
 698         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 699                                           (1<<__LINK_STATE_DORMANT))) |
 700                       (1<<__LINK_STATE_PRESENT);
 701
 702         dev->features |= real_dev->features & real_dev->vlan_features;
 703         dev->features |= NETIF_F_LLTX;
 704         dev->gso_max_size = real_dev->gso_max_size;
 705
 706         /* ipv6 shared card related stuff */
 707         dev->dev_id = real_dev->dev_id;
 708
 709         if (is_zero_ether_addr(dev->dev_addr))
 710                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 711         if (is_zero_ether_addr(dev->broadcast))
 712                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 713
 714 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 715         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 716 #endif
 717
 718         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 719                 dev->header_ops      = real_dev->header_ops;
 720                 dev->hard_header_len = real_dev->hard_header_len;
 721         } else {
 722                 dev->header_ops      = &vlan_header_ops;
 723                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 724         }
 725
 726         if (real_dev->netdev_ops->ndo_select_queue)
 727                 dev->netdev_ops = &vlan_netdev_ops_sq;
 728         else
 729                 dev->netdev_ops = &vlan_netdev_ops;
 730
 731         if (is_vlan_dev(real_dev))
 732                 subclass = 1;
 733
 734         vlan_dev_set_lockdep_class(dev, subclass);
 735
 736         vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 737         if (!vlan_dev_info(dev)->vlan_pcpu_stats)
 738                 return -ENOMEM;
 739
 740         return 0;
 741 }
 742
 743 static void vlan_dev_uninit(struct net_device *dev)
 744 {
 745         struct vlan_priority_tci_mapping *pm;
 746         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 747         int i;
 748
 749         free_percpu(vlan->vlan_pcpu_stats);
 750         vlan->vlan_pcpu_stats = NULL;
 751         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 752                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 753                         vlan->egress_priority_map[i] = pm->next;
 754                         kfree(pm);
 755                 }
 756         }
 757 }
 758
 759 static int vlan_ethtool_get_settings(struct net_device *dev,
 760                                      struct ethtool_cmd *cmd)
 761 {
 762         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 763         return dev_ethtool_get_settings(vlan->real_dev, cmd);
 764 }
 765
 766 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 767                                      struct ethtool_drvinfo *info)
 768 {
 769         strcpy(info->driver, vlan_fullname);
 770         strcpy(info->version, vlan_version);
 771         strcpy(info->fw_version, "N/A");
 772 }
 773
 774 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 775 {
 776         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 777         return dev_ethtool_get_rx_csum(vlan->real_dev);
 778 }
 779
 780 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 781 {
 782         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 783         return dev_ethtool_get_flags(vlan->real_dev);
 784 }
 785
 786 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 787 {
 788
 789         if (vlan_dev_info(dev)->vlan_pcpu_stats) {
 790                 struct vlan_pcpu_stats *p;
 791                 u32 rx_errors = 0, tx_dropped = 0;
 792                 int i;
 793
 794                 for_each_possible_cpu(i) {
 795                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 796                         unsigned int start;
 797
 798                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i);
 799                         do {
 800                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 801                                 rxpackets       = p->rx_packets;
 802                                 rxbytes         = p->rx_bytes;
 803                                 rxmulticast     = p->rx_multicast;
 804                                 txpackets       = p->tx_packets;
 805                                 txbytes         = p->tx_bytes;
 806                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 807
 808                         stats->rx_packets       += rxpackets;
 809                         stats->rx_bytes         += rxbytes;
 810                         stats->multicast        += rxmulticast;
 811                         stats->tx_packets       += txpackets;
 812                         stats->tx_bytes         += txbytes;
 813                         /* rx_errors & tx_dropped are u32 */
 814                         rx_errors       += p->rx_errors;
 815                         tx_dropped      += p->tx_dropped;
 816                 }
 817                 stats->rx_errors  = rx_errors;
 818                 stats->tx_dropped = tx_dropped;
 819         }
 820         return stats;
 821 }
 822
 823 static int vlan_ethtool_set_tso(struct net_device *dev, u32 data)
 824 {
 825        if (data) {
 826                 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 827
 828                 /* Underlying device must support TSO for VLAN-tagged packets
 829                  * and must have TSO enabled now.
 830                  */
 831                 if (!(real_dev->vlan_features & NETIF_F_TSO))
 832                         return -EOPNOTSUPP;
 833                 if (!(real_dev->features & NETIF_F_TSO))
 834                         return -EINVAL;
 835                 dev->features |= NETIF_F_TSO;
 836         } else {
 837                 dev->features &= ~NETIF_F_TSO;
 838         }
 839         return 0;
 840 }
 841
 842 static const struct ethtool_ops vlan_ethtool_ops = {
 843         .get_settings           = vlan_ethtool_get_settings,
 844         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 845         .get_link               = ethtool_op_get_link,
 846         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 847         .get_flags              = vlan_ethtool_get_flags,
 848         .set_tso                = vlan_ethtool_set_tso,
 849 };
 850
 851 static const struct net_device_ops vlan_netdev_ops = {
 852         .ndo_change_mtu         = vlan_dev_change_mtu,
 853         .ndo_init               = vlan_dev_init,
 854         .ndo_uninit             = vlan_dev_uninit,
 855         .ndo_open               = vlan_dev_open,
 856         .ndo_stop               = vlan_dev_stop,
 857         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 858         .ndo_validate_addr      = eth_validate_addr,
 859         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 860         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 861         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 862         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 863         .ndo_do_ioctl           = vlan_dev_ioctl,
 864         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 865         .ndo_get_stats64        = vlan_dev_get_stats64,
 866 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 867         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 868         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 869         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 870         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 871         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 872 #endif
 873 };
 874
 875 static const struct net_device_ops vlan_netdev_ops_sq = {
 876         .ndo_select_queue       = vlan_dev_select_queue,
 877         .ndo_change_mtu         = vlan_dev_change_mtu,
 878         .ndo_init               = vlan_dev_init,
 879         .ndo_uninit             = vlan_dev_uninit,
 880         .ndo_open               = vlan_dev_open,
 881         .ndo_stop               = vlan_dev_stop,
 882         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 883         .ndo_validate_addr      = eth_validate_addr,
 884         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 885         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 886         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 887         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 888         .ndo_do_ioctl           = vlan_dev_ioctl,
 889         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 890         .ndo_get_stats64        = vlan_dev_get_stats64,
 891 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 892         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 893         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 894         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 895         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 896         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 897 #endif
 898 };
 899
 900 void vlan_setup(struct net_device *dev)
 901 {
 902         ether_setup(dev);
 903
 904         dev->priv_flags         |= IFF_802_1Q_VLAN;
 905         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 906         dev->tx_queue_len       = 0;
 907
 908         dev->netdev_ops         = &vlan_netdev_ops;
 909         dev->destructor         = free_netdev;
 910         dev->ethtool_ops        = &vlan_ethtool_ops;
 911
 912         memset(dev->broadcast, 0, ETH_ALEN);
 913 }