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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/ethtool.h>
  31 #include <net/arp.h>
  32
  33 #include "vlan.h"
  34 #include "vlanproc.h"
  35 #include <linux/if_vlan.h>
  36
  37 /*
  38  *      Rebuild the Ethernet MAC header. This is called after an ARP
  39  *      (or in future other address resolution) has completed on this
  40  *      sk_buff. We now let ARP fill in the other fields.
  41  *
  42  *      This routine CANNOT use cached dst->neigh!
  43  *      Really, it is used only when dst->neigh is wrong.
  44  *
  45  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  46  */
  47 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  48 {
  49         struct net_device *dev = skb->dev;
  50         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  51
  52         switch (veth->h_vlan_encapsulated_proto) {
  53 #ifdef CONFIG_INET
  54         case htons(ETH_P_IP):
  55
  56                 /* TODO:  Confirm this will work with VLAN headers... */
  57                 return arp_find(veth->h_dest, skb);
  58 #endif
  59         default:
  60                 pr_debug("%s: unable to resolve type %X addresses\n",
  61                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  62
  63                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  64                 break;
  65         }
  66
  67         return 0;
  68 }
  69
  70 static inline u16
  71 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
  72 {
  73         struct vlan_priority_tci_mapping *mp;
  74
  75         smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
  76
  77         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
  78         while (mp) {
  79                 if (mp->priority == skb->priority) {
  80                         return mp->vlan_qos; /* This should already be shifted
  81                                               * to mask correctly with the
  82                                               * VLAN's TCI */
  83                 }
  84                 mp = mp->next;
  85         }
  86         return 0;
  87 }
  88
  89 /*
  90  *      Create the VLAN header for an arbitrary protocol layer
  91  *
  92  *      saddr=NULL      means use device source address
  93  *      daddr=NULL      means leave destination address (eg unresolved arp)
  94  *
  95  *  This is called when the SKB is moving down the stack towards the
  96  *  physical devices.
  97  */
  98 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  99                                 unsigned short type,
 100                                 const void *daddr, const void *saddr,
 101                                 unsigned int len)
 102 {
 103         struct vlan_hdr *vhdr;
 104         unsigned int vhdrlen = 0;
 105         u16 vlan_tci = 0;
 106         int rc;
 107
 108         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 109                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 110
 111                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 112                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 113                 vhdr->h_vlan_TCI = htons(vlan_tci);
 114
 115                 /*
 116                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 117                  *  put the length in here instead.
 118                  */
 119                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 120                         vhdr->h_vlan_encapsulated_proto = htons(type);
 121                 else
 122                         vhdr->h_vlan_encapsulated_proto = htons(len);
 123
 124                 skb->protocol = htons(ETH_P_8021Q);
 125                 type = ETH_P_8021Q;
 126                 vhdrlen = VLAN_HLEN;
 127         }
 128
 129         /* Before delegating work to the lower layer, enter our MAC-address */
 130         if (saddr == NULL)
 131                 saddr = dev->dev_addr;
 132
 133         /* Now make the underlying real hard header */
 134         dev = vlan_dev_info(dev)->real_dev;
 135         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 136         if (rc > 0)
 137                 rc += vhdrlen;
 138         return rc;
 139 }
 140
 141 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 142                                             struct net_device *dev)
 143 {
 144         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 145         unsigned int len;
 146         int ret;
 147
 148         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 149          *
 150          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 151          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 152          */
 153         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 154             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 155                 u16 vlan_tci;
 156                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 157                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 158                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 159         }
 160
 161         skb->dev = vlan_dev_info(dev)->real_dev;
 162         len = skb->len;
 163         ret = dev_queue_xmit(skb);
 164
 165         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 166                 struct vlan_pcpu_stats *stats;
 167
 168                 stats = this_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats);
 169                 u64_stats_update_begin(&stats->syncp);
 170                 stats->tx_packets++;
 171                 stats->tx_bytes += len;
 172                 u64_stats_update_end(&stats->syncp);
 173         } else {
 174                 this_cpu_inc(vlan_dev_info(dev)->vlan_pcpu_stats->tx_dropped);
 175         }
 176
 177         return ret;
 178 }
 179
 180 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 181 {
 182         /* TODO: gotta make sure the underlying layer can handle it,
 183          * maybe an IFF_VLAN_CAPABLE flag for devices?
 184          */
 185         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 186                 return -ERANGE;
 187
 188         dev->mtu = new_mtu;
 189
 190         return 0;
 191 }
 192
 193 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 194                                    u32 skb_prio, u16 vlan_prio)
 195 {
 196         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 197
 198         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 199                 vlan->nr_ingress_mappings--;
 200         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 201                 vlan->nr_ingress_mappings++;
 202
 203         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 204 }
 205
 206 int vlan_dev_set_egress_priority(const struct net_device *dev,
 207                                  u32 skb_prio, u16 vlan_prio)
 208 {
 209         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 210         struct vlan_priority_tci_mapping *mp = NULL;
 211         struct vlan_priority_tci_mapping *np;
 212         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 213
 214         /* See if a priority mapping exists.. */
 215         mp = vlan->egress_priority_map[skb_prio & 0xF];
 216         while (mp) {
 217                 if (mp->priority == skb_prio) {
 218                         if (mp->vlan_qos && !vlan_qos)
 219                                 vlan->nr_egress_mappings--;
 220                         else if (!mp->vlan_qos && vlan_qos)
 221                                 vlan->nr_egress_mappings++;
 222                         mp->vlan_qos = vlan_qos;
 223                         return 0;
 224                 }
 225                 mp = mp->next;
 226         }
 227
 228         /* Create a new mapping then. */
 229         mp = vlan->egress_priority_map[skb_prio & 0xF];
 230         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 231         if (!np)
 232                 return -ENOBUFS;
 233
 234         np->next = mp;
 235         np->priority = skb_prio;
 236         np->vlan_qos = vlan_qos;
 237         /* Before inserting this element in hash table, make sure all its fields
 238          * are committed to memory.
 239          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 240          */
 241         smp_wmb();
 242         vlan->egress_priority_map[skb_prio & 0xF] = np;
 243         if (vlan_qos)
 244                 vlan->nr_egress_mappings++;
 245         return 0;
 246 }
 247
 248 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 249 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 250 {
 251         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 252         u32 old_flags = vlan->flags;
 253
 254         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 255                      VLAN_FLAG_LOOSE_BINDING))
 256                 return -EINVAL;
 257
 258         vlan->flags = (old_flags & ~mask) | (flags & mask);
 259
 260         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 261                 if (vlan->flags & VLAN_FLAG_GVRP)
 262                         vlan_gvrp_request_join(dev);
 263                 else
 264                         vlan_gvrp_request_leave(dev);
 265         }
 266         return 0;
 267 }
 268
 269 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 270 {
 271         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 272 }
 273
 274 static int vlan_dev_open(struct net_device *dev)
 275 {
 276         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 277         struct net_device *real_dev = vlan->real_dev;
 278         int err;
 279
 280         if (!(real_dev->flags & IFF_UP) &&
 281             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 282                 return -ENETDOWN;
 283
 284         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 285                 err = dev_uc_add(real_dev, dev->dev_addr);
 286                 if (err < 0)
 287                         goto out;
 288         }
 289
 290         if (dev->flags & IFF_ALLMULTI) {
 291                 err = dev_set_allmulti(real_dev, 1);
 292                 if (err < 0)
 293                         goto del_unicast;
 294         }
 295         if (dev->flags & IFF_PROMISC) {
 296                 err = dev_set_promiscuity(real_dev, 1);
 297                 if (err < 0)
 298                         goto clear_allmulti;
 299         }
 300
 301         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 302
 303         if (vlan->flags & VLAN_FLAG_GVRP)
 304                 vlan_gvrp_request_join(dev);
 305
 306         if (netif_carrier_ok(real_dev))
 307                 netif_carrier_on(dev);
 308         return 0;
 309
 310 clear_allmulti:
 311         if (dev->flags & IFF_ALLMULTI)
 312                 dev_set_allmulti(real_dev, -1);
 313 del_unicast:
 314         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 315                 dev_uc_del(real_dev, dev->dev_addr);
 316 out:
 317         netif_carrier_off(dev);
 318         return err;
 319 }
 320
 321 static int vlan_dev_stop(struct net_device *dev)
 322 {
 323         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 324         struct net_device *real_dev = vlan->real_dev;
 325
 326         dev_mc_unsync(real_dev, dev);
 327         dev_uc_unsync(real_dev, dev);
 328         if (dev->flags & IFF_ALLMULTI)
 329                 dev_set_allmulti(real_dev, -1);
 330         if (dev->flags & IFF_PROMISC)
 331                 dev_set_promiscuity(real_dev, -1);
 332
 333         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 334                 dev_uc_del(real_dev, dev->dev_addr);
 335
 336         netif_carrier_off(dev);
 337         return 0;
 338 }
 339
 340 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 341 {
 342         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 343         struct sockaddr *addr = p;
 344         int err;
 345
 346         if (!is_valid_ether_addr(addr->sa_data))
 347                 return -EADDRNOTAVAIL;
 348
 349         if (!(dev->flags & IFF_UP))
 350                 goto out;
 351
 352         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 353                 err = dev_uc_add(real_dev, addr->sa_data);
 354                 if (err < 0)
 355                         return err;
 356         }
 357
 358         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 359                 dev_uc_del(real_dev, dev->dev_addr);
 360
 361 out:
 362         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 363         return 0;
 364 }
 365
 366 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 367 {
 368         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 369         const struct net_device_ops *ops = real_dev->netdev_ops;
 370         struct ifreq ifrr;
 371         int err = -EOPNOTSUPP;
 372
 373         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 374         ifrr.ifr_ifru = ifr->ifr_ifru;
 375
 376         switch (cmd) {
 377         case SIOCGMIIPHY:
 378         case SIOCGMIIREG:
 379         case SIOCSMIIREG:
 380                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 381                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 382                 break;
 383         }
 384
 385         if (!err)
 386                 ifr->ifr_ifru = ifrr.ifr_ifru;
 387
 388         return err;
 389 }
 390
 391 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 392 {
 393         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 394         const struct net_device_ops *ops = real_dev->netdev_ops;
 395         int err = 0;
 396
 397         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 398                 err = ops->ndo_neigh_setup(real_dev, pa);
 399
 400         return err;
 401 }
 402
 403 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 404 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 405                                    struct scatterlist *sgl, unsigned int sgc)
 406 {
 407         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 408         const struct net_device_ops *ops = real_dev->netdev_ops;
 409         int rc = 0;
 410
 411         if (ops->ndo_fcoe_ddp_setup)
 412                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 413
 414         return rc;
 415 }
 416
 417 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 418 {
 419         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 420         const struct net_device_ops *ops = real_dev->netdev_ops;
 421         int len = 0;
 422
 423         if (ops->ndo_fcoe_ddp_done)
 424                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 425
 426         return len;
 427 }
 428
 429 static int vlan_dev_fcoe_enable(struct net_device *dev)
 430 {
 431         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 432         const struct net_device_ops *ops = real_dev->netdev_ops;
 433         int rc = -EINVAL;
 434
 435         if (ops->ndo_fcoe_enable)
 436                 rc = ops->ndo_fcoe_enable(real_dev);
 437         return rc;
 438 }
 439
 440 static int vlan_dev_fcoe_disable(struct net_device *dev)
 441 {
 442         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 443         const struct net_device_ops *ops = real_dev->netdev_ops;
 444         int rc = -EINVAL;
 445
 446         if (ops->ndo_fcoe_disable)
 447                 rc = ops->ndo_fcoe_disable(real_dev);
 448         return rc;
 449 }
 450
 451 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 452 {
 453         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 454         const struct net_device_ops *ops = real_dev->netdev_ops;
 455         int rc = -EINVAL;
 456
 457         if (ops->ndo_fcoe_get_wwn)
 458                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 459         return rc;
 460 }
 461
 462 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 463                                     struct scatterlist *sgl, unsigned int sgc)
 464 {
 465         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 466         const struct net_device_ops *ops = real_dev->netdev_ops;
 467         int rc = 0;
 468
 469         if (ops->ndo_fcoe_ddp_target)
 470                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 471
 472         return rc;
 473 }
 474 #endif
 475
 476 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 477 {
 478         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 479
 480         if (dev->flags & IFF_UP) {
 481                 if (change & IFF_ALLMULTI)
 482                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 483                 if (change & IFF_PROMISC)
 484                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 485         }
 486 }
 487
 488 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 489 {
 490         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 491         dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 492 }
 493
 494 /*
 495  * vlan network devices have devices nesting below it, and are a special
 496  * "super class" of normal network devices; split their locks off into a
 497  * separate class since they always nest.
 498  */
 499 static struct lock_class_key vlan_netdev_xmit_lock_key;
 500 static struct lock_class_key vlan_netdev_addr_lock_key;
 501
 502 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 503                                      struct netdev_queue *txq,
 504                                      void *_subclass)
 505 {
 506         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 507                                        &vlan_netdev_xmit_lock_key,
 508                                        *(int *)_subclass);
 509 }
 510
 511 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 512 {
 513         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 514                                        &vlan_netdev_addr_lock_key,
 515                                        subclass);
 516         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 517 }
 518
 519 static const struct header_ops vlan_header_ops = {
 520         .create  = vlan_dev_hard_header,
 521         .rebuild = vlan_dev_rebuild_header,
 522         .parse   = eth_header_parse,
 523 };
 524
 525 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 526                                      unsigned short type,
 527                                      const void *daddr, const void *saddr,
 528                                      unsigned int len)
 529 {
 530         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 531
 532         if (saddr == NULL)
 533                 saddr = dev->dev_addr;
 534
 535         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 536 }
 537
 538 static const struct header_ops vlan_passthru_header_ops = {
 539         .create  = vlan_passthru_hard_header,
 540         .rebuild = dev_rebuild_header,
 541         .parse   = eth_header_parse,
 542 };
 543
 544 static const struct net_device_ops vlan_netdev_ops;
 545
 546 static int vlan_dev_init(struct net_device *dev)
 547 {
 548         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 549         int subclass = 0;
 550
 551         netif_carrier_off(dev);
 552
 553         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 554         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 555                                           IFF_MASTER | IFF_SLAVE);
 556         dev->iflink = real_dev->ifindex;
 557         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 558                                           (1<<__LINK_STATE_DORMANT))) |
 559                       (1<<__LINK_STATE_PRESENT);
 560
 561         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 562                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 563                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 564                            NETIF_F_ALL_FCOE;
 565
 566         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 567         dev->gso_max_size = real_dev->gso_max_size;
 568
 569         /* ipv6 shared card related stuff */
 570         dev->dev_id = real_dev->dev_id;
 571
 572         if (is_zero_ether_addr(dev->dev_addr))
 573                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 574         if (is_zero_ether_addr(dev->broadcast))
 575                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 576
 577 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 578         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 579 #endif
 580
 581         dev->needed_headroom = real_dev->needed_headroom;
 582         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 583                 dev->header_ops      = &vlan_passthru_header_ops;
 584                 dev->hard_header_len = real_dev->hard_header_len;
 585         } else {
 586                 dev->header_ops      = &vlan_header_ops;
 587                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 588         }
 589
 590         dev->netdev_ops = &vlan_netdev_ops;
 591
 592         if (is_vlan_dev(real_dev))
 593                 subclass = 1;
 594
 595         vlan_dev_set_lockdep_class(dev, subclass);
 596
 597         vlan_dev_info(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 598         if (!vlan_dev_info(dev)->vlan_pcpu_stats)
 599                 return -ENOMEM;
 600
 601         return 0;
 602 }
 603
 604 static void vlan_dev_uninit(struct net_device *dev)
 605 {
 606         struct vlan_priority_tci_mapping *pm;
 607         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 608         int i;
 609
 610         free_percpu(vlan->vlan_pcpu_stats);
 611         vlan->vlan_pcpu_stats = NULL;
 612         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 613                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 614                         vlan->egress_priority_map[i] = pm->next;
 615                         kfree(pm);
 616                 }
 617         }
 618 }
 619
 620 static u32 vlan_dev_fix_features(struct net_device *dev, u32 features)
 621 {
 622         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 623         u32 old_features = features;
 624
 625         features &= real_dev->features;
 626         features &= real_dev->vlan_features;
 627
 628         features |= old_features & NETIF_F_SOFT_FEATURES;
 629
 630         if (dev_ethtool_get_rx_csum(real_dev))
 631                 features |= NETIF_F_RXCSUM;
 632         features |= NETIF_F_LLTX;
 633
 634         return features;
 635 }
 636
 637 static int vlan_ethtool_get_settings(struct net_device *dev,
 638                                      struct ethtool_cmd *cmd)
 639 {
 640         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 641
 642         return __ethtool_get_settings(vlan->real_dev, cmd);
 643 }
 644
 645 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 646                                      struct ethtool_drvinfo *info)
 647 {
 648         strcpy(info->driver, vlan_fullname);
 649         strcpy(info->version, vlan_version);
 650         strcpy(info->fw_version, "N/A");
 651 }
 652
 653 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 654 {
 655
 656         if (vlan_dev_info(dev)->vlan_pcpu_stats) {
 657                 struct vlan_pcpu_stats *p;
 658                 u32 rx_errors = 0, tx_dropped = 0;
 659                 int i;
 660
 661                 for_each_possible_cpu(i) {
 662                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 663                         unsigned int start;
 664
 665                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_pcpu_stats, i);
 666                         do {
 667                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 668                                 rxpackets       = p->rx_packets;
 669                                 rxbytes         = p->rx_bytes;
 670                                 rxmulticast     = p->rx_multicast;
 671                                 txpackets       = p->tx_packets;
 672                                 txbytes         = p->tx_bytes;
 673                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 674
 675                         stats->rx_packets       += rxpackets;
 676                         stats->rx_bytes         += rxbytes;
 677                         stats->multicast        += rxmulticast;
 678                         stats->tx_packets       += txpackets;
 679                         stats->tx_bytes         += txbytes;
 680                         /* rx_errors & tx_dropped are u32 */
 681                         rx_errors       += p->rx_errors;
 682                         tx_dropped      += p->tx_dropped;
 683                 }
 684                 stats->rx_errors  = rx_errors;
 685                 stats->tx_dropped = tx_dropped;
 686         }
 687         return stats;
 688 }
 689
 690 static const struct ethtool_ops vlan_ethtool_ops = {
 691         .get_settings           = vlan_ethtool_get_settings,
 692         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 693         .get_link               = ethtool_op_get_link,
 694 };
 695
 696 static const struct net_device_ops vlan_netdev_ops = {
 697         .ndo_change_mtu         = vlan_dev_change_mtu,
 698         .ndo_init               = vlan_dev_init,
 699         .ndo_uninit             = vlan_dev_uninit,
 700         .ndo_open               = vlan_dev_open,
 701         .ndo_stop               = vlan_dev_stop,
 702         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 703         .ndo_validate_addr      = eth_validate_addr,
 704         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 705         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 706         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 707         .ndo_do_ioctl           = vlan_dev_ioctl,
 708         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 709         .ndo_get_stats64        = vlan_dev_get_stats64,
 710 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 711         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 712         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 713         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 714         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 715         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 716         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 717 #endif
 718         .ndo_fix_features       = vlan_dev_fix_features,
 719 };
 720
 721 void vlan_setup(struct net_device *dev)
 722 {
 723         ether_setup(dev);
 724
 725         dev->priv_flags         |= IFF_802_1Q_VLAN;
 726         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 727         dev->tx_queue_len       = 0;
 728
 729         dev->netdev_ops         = &vlan_netdev_ops;
 730         dev->destructor         = free_netdev;
 731         dev->ethtool_ops        = &vlan_ethtool_ops;
 732
 733         memset(dev->broadcast, 0, ETH_ALEN);
 734 }