net/8021q/vlan_dev.c

   1 /* -*- linux-c -*-
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <[email protected]>
   6  *              Please send support related email to: [email protected]
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:       Mar 22 2001: Martin Bokaemper <[email protected]>
  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 #include <linux/netpoll.h>
  37
  38 /*
  39  *      Rebuild the Ethernet MAC header. This is called after an ARP
  40  *      (or in future other address resolution) has completed on this
  41  *      sk_buff. We now let ARP fill in the other fields.
  42  *
  43  *      This routine CANNOT use cached dst->neigh!
  44  *      Really, it is used only when dst->neigh is wrong.
  45  *
  46  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  47  */
  48 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  49 {
  50         struct net_device *dev = skb->dev;
  51         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  52
  53         switch (veth->h_vlan_encapsulated_proto) {
  54 #ifdef CONFIG_INET
  55         case htons(ETH_P_IP):
  56
  57                 /* TODO:  Confirm this will work with VLAN headers... */
  58                 return arp_find(veth->h_dest, skb);
  59 #endif
  60         default:
  61                 pr_debug("%s: unable to resolve type %X addresses\n",
  62                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  63
  64                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  65                 break;
  66         }
  67
  68         return 0;
  69 }
  70
  71 static inline u16
  72 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
  73 {
  74         struct vlan_priority_tci_mapping *mp;
  75
  76         mp = vlan_dev_priv(dev)->egress_priority_map[(skb->priority & 0xF)];
  77         while (mp) {
  78                 if (mp->priority == skb->priority) {
  79                         return mp->vlan_qos; /* This should already be shifted
  80                                               * to mask correctly with the
  81                                               * VLAN's TCI */
  82                 }
  83                 mp = mp->next;
  84         }
  85         return 0;
  86 }
  87
  88 /*
  89  *      Create the VLAN header for an arbitrary protocol layer
  90  *
  91  *      saddr=NULL      means use device source address
  92  *      daddr=NULL      means leave destination address (eg unresolved arp)
  93  *
  94  *  This is called when the SKB is moving down the stack towards the
  95  *  physical devices.
  96  */
  97 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  98                                 unsigned short type,
  99                                 const void *daddr, const void *saddr,
 100                                 unsigned int len)
 101 {
 102         struct vlan_hdr *vhdr;
 103         unsigned int vhdrlen = 0;
 104         u16 vlan_tci = 0;
 105         int rc;
 106
 107         if (!(vlan_dev_priv(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 108                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 109
 110                 vlan_tci = vlan_dev_priv(dev)->vlan_id;
 111                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 112                 vhdr->h_vlan_TCI = htons(vlan_tci);
 113
 114                 /*
 115                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 116                  *  put the length in here instead.
 117                  */
 118                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 119                         vhdr->h_vlan_encapsulated_proto = htons(type);
 120                 else
 121                         vhdr->h_vlan_encapsulated_proto = htons(len);
 122
 123                 skb->protocol = htons(ETH_P_8021Q);
 124                 type = ETH_P_8021Q;
 125                 vhdrlen = VLAN_HLEN;
 126         }
 127
 128         /* Before delegating work to the lower layer, enter our MAC-address */
 129         if (saddr == NULL)
 130                 saddr = dev->dev_addr;
 131
 132         /* Now make the underlying real hard header */
 133         dev = vlan_dev_priv(dev)->real_dev;
 134         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 135         if (rc > 0)
 136                 rc += vhdrlen;
 137         return rc;
 138 }
 139
 140 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 141 {
 142 #ifdef CONFIG_NET_POLL_CONTROLLER
 143         if (vlan->netpoll)
 144                 netpoll_send_skb(vlan->netpoll, skb);
 145 #else
 146         BUG();
 147 #endif
 148         return NETDEV_TX_OK;
 149 }
 150
 151 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 152                                             struct net_device *dev)
 153 {
 154         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 155         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 156         unsigned int len;
 157         int ret;
 158
 159         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 160          *
 161          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 162          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 163          */
 164         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 165             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 166                 u16 vlan_tci;
 167                 vlan_tci = vlan->vlan_id;
 168                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 169                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 170         }
 171
 172         skb->dev = vlan->real_dev;
 173         len = skb->len;
 174         if (unlikely(netpoll_tx_running(dev)))
 175                 return vlan_netpoll_send_skb(vlan, skb);
 176
 177         ret = dev_queue_xmit(skb);
 178
 179         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 180                 struct vlan_pcpu_stats *stats;
 181
 182                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 183                 u64_stats_update_begin(&stats->syncp);
 184                 stats->tx_packets++;
 185                 stats->tx_bytes += len;
 186                 u64_stats_update_end(&stats->syncp);
 187         } else {
 188                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 189         }
 190
 191         return ret;
 192 }
 193
 194 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 195 {
 196         /* TODO: gotta make sure the underlying layer can handle it,
 197          * maybe an IFF_VLAN_CAPABLE flag for devices?
 198          */
 199         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 200                 return -ERANGE;
 201
 202         dev->mtu = new_mtu;
 203
 204         return 0;
 205 }
 206
 207 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 208                                    u32 skb_prio, u16 vlan_prio)
 209 {
 210         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 211
 212         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 213                 vlan->nr_ingress_mappings--;
 214         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 215                 vlan->nr_ingress_mappings++;
 216
 217         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 218 }
 219
 220 int vlan_dev_set_egress_priority(const struct net_device *dev,
 221                                  u32 skb_prio, u16 vlan_prio)
 222 {
 223         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 224         struct vlan_priority_tci_mapping *mp = NULL;
 225         struct vlan_priority_tci_mapping *np;
 226         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 227
 228         /* See if a priority mapping exists.. */
 229         mp = vlan->egress_priority_map[skb_prio & 0xF];
 230         while (mp) {
 231                 if (mp->priority == skb_prio) {
 232                         if (mp->vlan_qos && !vlan_qos)
 233                                 vlan->nr_egress_mappings--;
 234                         else if (!mp->vlan_qos && vlan_qos)
 235                                 vlan->nr_egress_mappings++;
 236                         mp->vlan_qos = vlan_qos;
 237                         return 0;
 238                 }
 239                 mp = mp->next;
 240         }
 241
 242         /* Create a new mapping then. */
 243         mp = vlan->egress_priority_map[skb_prio & 0xF];
 244         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 245         if (!np)
 246                 return -ENOBUFS;
 247
 248         np->next = mp;
 249         np->priority = skb_prio;
 250         np->vlan_qos = vlan_qos;
 251         vlan->egress_priority_map[skb_prio & 0xF] = np;
 252         if (vlan_qos)
 253                 vlan->nr_egress_mappings++;
 254         return 0;
 255 }
 256
 257 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 258 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 259 {
 260         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 261         u32 old_flags = vlan->flags;
 262
 263         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 264                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 265                 return -EINVAL;
 266
 267         vlan->flags = (old_flags & ~mask) | (flags & mask);
 268
 269         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 270                 if (vlan->flags & VLAN_FLAG_GVRP)
 271                         vlan_gvrp_request_join(dev);
 272                 else
 273                         vlan_gvrp_request_leave(dev);
 274         }
 275
 276         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 277                 if (vlan->flags & VLAN_FLAG_MVRP)
 278                         vlan_mvrp_request_join(dev);
 279                 else
 280                         vlan_mvrp_request_leave(dev);
 281         }
 282         return 0;
 283 }
 284
 285 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 286 {
 287         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 288 }
 289
 290 static int vlan_dev_open(struct net_device *dev)
 291 {
 292         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 293         struct net_device *real_dev = vlan->real_dev;
 294         int err;
 295
 296         if (!(real_dev->flags & IFF_UP) &&
 297             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 298                 return -ENETDOWN;
 299
 300         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 301                 err = dev_uc_add(real_dev, dev->dev_addr);
 302                 if (err < 0)
 303                         goto out;
 304         }
 305
 306         if (dev->flags & IFF_ALLMULTI) {
 307                 err = dev_set_allmulti(real_dev, 1);
 308                 if (err < 0)
 309                         goto del_unicast;
 310         }
 311         if (dev->flags & IFF_PROMISC) {
 312                 err = dev_set_promiscuity(real_dev, 1);
 313                 if (err < 0)
 314                         goto clear_allmulti;
 315         }
 316
 317         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 318
 319         if (vlan->flags & VLAN_FLAG_GVRP)
 320                 vlan_gvrp_request_join(dev);
 321
 322         if (vlan->flags & VLAN_FLAG_MVRP)
 323                 vlan_mvrp_request_join(dev);
 324
 325         if (netif_carrier_ok(real_dev))
 326                 netif_carrier_on(dev);
 327         return 0;
 328
 329 clear_allmulti:
 330         if (dev->flags & IFF_ALLMULTI)
 331                 dev_set_allmulti(real_dev, -1);
 332 del_unicast:
 333         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 334                 dev_uc_del(real_dev, dev->dev_addr);
 335 out:
 336         netif_carrier_off(dev);
 337         return err;
 338 }
 339
 340 static int vlan_dev_stop(struct net_device *dev)
 341 {
 342         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 343         struct net_device *real_dev = vlan->real_dev;
 344
 345         dev_mc_unsync(real_dev, dev);
 346         dev_uc_unsync(real_dev, dev);
 347         if (dev->flags & IFF_ALLMULTI)
 348                 dev_set_allmulti(real_dev, -1);
 349         if (dev->flags & IFF_PROMISC)
 350                 dev_set_promiscuity(real_dev, -1);
 351
 352         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 353                 dev_uc_del(real_dev, dev->dev_addr);
 354
 355         netif_carrier_off(dev);
 356         return 0;
 357 }
 358
 359 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 360 {
 361         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 362         struct sockaddr *addr = p;
 363         int err;
 364
 365         if (!is_valid_ether_addr(addr->sa_data))
 366                 return -EADDRNOTAVAIL;
 367
 368         if (!(dev->flags & IFF_UP))
 369                 goto out;
 370
 371         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 372                 err = dev_uc_add(real_dev, addr->sa_data);
 373                 if (err < 0)
 374                         return err;
 375         }
 376
 377         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 378                 dev_uc_del(real_dev, dev->dev_addr);
 379
 380 out:
 381         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 382         return 0;
 383 }
 384
 385 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 386 {
 387         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 388         const struct net_device_ops *ops = real_dev->netdev_ops;
 389         struct ifreq ifrr;
 390         int err = -EOPNOTSUPP;
 391
 392         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 393         ifrr.ifr_ifru = ifr->ifr_ifru;
 394
 395         switch (cmd) {
 396         case SIOCGMIIPHY:
 397         case SIOCGMIIREG:
 398         case SIOCSMIIREG:
 399                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 400                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 401                 break;
 402         }
 403
 404         if (!err)
 405                 ifr->ifr_ifru = ifrr.ifr_ifru;
 406
 407         return err;
 408 }
 409
 410 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 411 {
 412         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 413         const struct net_device_ops *ops = real_dev->netdev_ops;
 414         int err = 0;
 415
 416         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 417                 err = ops->ndo_neigh_setup(real_dev, pa);
 418
 419         return err;
 420 }
 421
 422 #if IS_ENABLED(CONFIG_FCOE)
 423 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 424                                    struct scatterlist *sgl, unsigned int sgc)
 425 {
 426         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 427         const struct net_device_ops *ops = real_dev->netdev_ops;
 428         int rc = 0;
 429
 430         if (ops->ndo_fcoe_ddp_setup)
 431                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 432
 433         return rc;
 434 }
 435
 436 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 437 {
 438         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 439         const struct net_device_ops *ops = real_dev->netdev_ops;
 440         int len = 0;
 441
 442         if (ops->ndo_fcoe_ddp_done)
 443                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 444
 445         return len;
 446 }
 447
 448 static int vlan_dev_fcoe_enable(struct net_device *dev)
 449 {
 450         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 451         const struct net_device_ops *ops = real_dev->netdev_ops;
 452         int rc = -EINVAL;
 453
 454         if (ops->ndo_fcoe_enable)
 455                 rc = ops->ndo_fcoe_enable(real_dev);
 456         return rc;
 457 }
 458
 459 static int vlan_dev_fcoe_disable(struct net_device *dev)
 460 {
 461         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 462         const struct net_device_ops *ops = real_dev->netdev_ops;
 463         int rc = -EINVAL;
 464
 465         if (ops->ndo_fcoe_disable)
 466                 rc = ops->ndo_fcoe_disable(real_dev);
 467         return rc;
 468 }
 469
 470 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 471 {
 472         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 473         const struct net_device_ops *ops = real_dev->netdev_ops;
 474         int rc = -EINVAL;
 475
 476         if (ops->ndo_fcoe_get_wwn)
 477                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 478         return rc;
 479 }
 480
 481 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 482                                     struct scatterlist *sgl, unsigned int sgc)
 483 {
 484         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 485         const struct net_device_ops *ops = real_dev->netdev_ops;
 486         int rc = 0;
 487
 488         if (ops->ndo_fcoe_ddp_target)
 489                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 490
 491         return rc;
 492 }
 493 #endif
 494
 495 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 496 {
 497         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 498
 499         if (dev->flags & IFF_UP) {
 500                 if (change & IFF_ALLMULTI)
 501                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 502                 if (change & IFF_PROMISC)
 503                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 504         }
 505 }
 506
 507 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 508 {
 509         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 510         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 511 }
 512
 513 /*
 514  * vlan network devices have devices nesting below it, and are a special
 515  * "super class" of normal network devices; split their locks off into a
 516  * separate class since they always nest.
 517  */
 518 static struct lock_class_key vlan_netdev_xmit_lock_key;
 519 static struct lock_class_key vlan_netdev_addr_lock_key;
 520
 521 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 522                                      struct netdev_queue *txq,
 523                                      void *_subclass)
 524 {
 525         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 526                                        &vlan_netdev_xmit_lock_key,
 527                                        *(int *)_subclass);
 528 }
 529
 530 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 531 {
 532         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 533                                        &vlan_netdev_addr_lock_key,
 534                                        subclass);
 535         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 536 }
 537
 538 static const struct header_ops vlan_header_ops = {
 539         .create  = vlan_dev_hard_header,
 540         .rebuild = vlan_dev_rebuild_header,
 541         .parse   = eth_header_parse,
 542 };
 543
 544 static struct device_type vlan_type = {
 545         .name   = "vlan",
 546 };
 547
 548 static const struct net_device_ops vlan_netdev_ops;
 549
 550 static int vlan_dev_init(struct net_device *dev)
 551 {
 552         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 553         int subclass = 0;
 554
 555         netif_carrier_off(dev);
 556
 557         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 558         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 559                                           IFF_MASTER | IFF_SLAVE);
 560         dev->iflink = real_dev->ifindex;
 561         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 562                                           (1<<__LINK_STATE_DORMANT))) |
 563                       (1<<__LINK_STATE_PRESENT);
 564
 565         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 566                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 567                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 568                            NETIF_F_ALL_FCOE;
 569
 570         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 571         dev->gso_max_size = real_dev->gso_max_size;
 572
 573         /* ipv6 shared card related stuff */
 574         dev->dev_id = real_dev->dev_id;
 575
 576         if (is_zero_ether_addr(dev->dev_addr))
 577                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 578         if (is_zero_ether_addr(dev->broadcast))
 579                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 580
 581 #if IS_ENABLED(CONFIG_FCOE)
 582         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 583 #endif
 584
 585         dev->needed_headroom = real_dev->needed_headroom;
 586         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 587                 dev->header_ops      = real_dev->header_ops;
 588                 dev->hard_header_len = real_dev->hard_header_len;
 589         } else {
 590                 dev->header_ops      = &vlan_header_ops;
 591                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 592         }
 593
 594         dev->netdev_ops = &vlan_netdev_ops;
 595
 596         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 597
 598         if (is_vlan_dev(real_dev))
 599                 subclass = 1;
 600
 601         vlan_dev_set_lockdep_class(dev, subclass);
 602
 603         vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 604         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 605                 return -ENOMEM;
 606
 607         return 0;
 608 }
 609
 610 static void vlan_dev_uninit(struct net_device *dev)
 611 {
 612         struct vlan_priority_tci_mapping *pm;
 613         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 614         int i;
 615
 616         free_percpu(vlan->vlan_pcpu_stats);
 617         vlan->vlan_pcpu_stats = NULL;
 618         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 619                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 620                         vlan->egress_priority_map[i] = pm->next;
 621                         kfree(pm);
 622                 }
 623         }
 624 }
 625
 626 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 627         netdev_features_t features)
 628 {
 629         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 630         u32 old_features = features;
 631
 632         features &= real_dev->vlan_features;
 633         features |= NETIF_F_RXCSUM;
 634         features &= real_dev->features;
 635
 636         features |= old_features & NETIF_F_SOFT_FEATURES;
 637         features |= NETIF_F_LLTX;
 638
 639         return features;
 640 }
 641
 642 static int vlan_ethtool_get_settings(struct net_device *dev,
 643                                      struct ethtool_cmd *cmd)
 644 {
 645         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 646
 647         return __ethtool_get_settings(vlan->real_dev, cmd);
 648 }
 649
 650 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 651                                      struct ethtool_drvinfo *info)
 652 {
 653         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 654         strlcpy(info->version, vlan_version, sizeof(info->version));
 655         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 656 }
 657
 658 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 659 {
 660
 661         if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
 662                 struct vlan_pcpu_stats *p;
 663                 u32 rx_errors = 0, tx_dropped = 0;
 664                 int i;
 665
 666                 for_each_possible_cpu(i) {
 667                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 668                         unsigned int start;
 669
 670                         p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 671                         do {
 672                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 673                                 rxpackets       = p->rx_packets;
 674                                 rxbytes         = p->rx_bytes;
 675                                 rxmulticast     = p->rx_multicast;
 676                                 txpackets       = p->tx_packets;
 677                                 txbytes         = p->tx_bytes;
 678                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 679
 680                         stats->rx_packets       += rxpackets;
 681                         stats->rx_bytes         += rxbytes;
 682                         stats->multicast        += rxmulticast;
 683                         stats->tx_packets       += txpackets;
 684                         stats->tx_bytes         += txbytes;
 685                         /* rx_errors & tx_dropped are u32 */
 686                         rx_errors       += p->rx_errors;
 687                         tx_dropped      += p->tx_dropped;
 688                 }
 689                 stats->rx_errors  = rx_errors;
 690                 stats->tx_dropped = tx_dropped;
 691         }
 692         return stats;
 693 }
 694
 695 #ifdef CONFIG_NET_POLL_CONTROLLER
 696 static void vlan_dev_poll_controller(struct net_device *dev)
 697 {
 698         return;
 699 }
 700
 701 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo,
 702                                   gfp_t gfp)
 703 {
 704         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 705         struct net_device *real_dev = vlan->real_dev;
 706         struct netpoll *netpoll;
 707         int err = 0;
 708
 709         netpoll = kzalloc(sizeof(*netpoll), gfp);
 710         err = -ENOMEM;
 711         if (!netpoll)
 712                 goto out;
 713
 714         err = __netpoll_setup(netpoll, real_dev, gfp);
 715         if (err) {
 716                 kfree(netpoll);
 717                 goto out;
 718         }
 719
 720         vlan->netpoll = netpoll;
 721
 722 out:
 723         return err;
 724 }
 725
 726 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 727 {
 728         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 729         struct netpoll *netpoll = vlan->netpoll;
 730
 731         if (!netpoll)
 732                 return;
 733
 734         vlan->netpoll = NULL;
 735
 736         __netpoll_free_async(netpoll);
 737 }
 738 #endif /* CONFIG_NET_POLL_CONTROLLER */
 739
 740 static const struct ethtool_ops vlan_ethtool_ops = {
 741         .get_settings           = vlan_ethtool_get_settings,
 742         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 743         .get_link               = ethtool_op_get_link,
 744 };
 745
 746 static const struct net_device_ops vlan_netdev_ops = {
 747         .ndo_change_mtu         = vlan_dev_change_mtu,
 748         .ndo_init               = vlan_dev_init,
 749         .ndo_uninit             = vlan_dev_uninit,
 750         .ndo_open               = vlan_dev_open,
 751         .ndo_stop               = vlan_dev_stop,
 752         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 753         .ndo_validate_addr      = eth_validate_addr,
 754         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 755         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 756         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 757         .ndo_do_ioctl           = vlan_dev_ioctl,
 758         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 759         .ndo_get_stats64        = vlan_dev_get_stats64,
 760 #if IS_ENABLED(CONFIG_FCOE)
 761         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 762         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 763         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 764         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 765         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 766         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 767 #endif
 768 #ifdef CONFIG_NET_POLL_CONTROLLER
 769         .ndo_poll_controller    = vlan_dev_poll_controller,
 770         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 771         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 772 #endif
 773         .ndo_fix_features       = vlan_dev_fix_features,
 774 };
 775
 776 void vlan_setup(struct net_device *dev)
 777 {
 778         ether_setup(dev);
 779
 780         dev->priv_flags         |= IFF_802_1Q_VLAN;
 781         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 782         dev->tx_queue_len       = 0;
 783
 784         dev->netdev_ops         = &vlan_netdev_ops;
 785         dev->destructor         = free_netdev;
 786         dev->ethtool_ops        = &vlan_ethtool_ops;
 787
 788         memset(dev->broadcast, 0, ETH_ALEN);
 789 }