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 #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 /*
  72  *      Create the VLAN header for an arbitrary protocol layer
  73  *
  74  *      saddr=NULL      means use device source address
  75  *      daddr=NULL      means leave destination address (eg unresolved arp)
  76  *
  77  *  This is called when the SKB is moving down the stack towards the
  78  *  physical devices.
  79  */
  80 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  81                                 unsigned short type,
  82                                 const void *daddr, const void *saddr,
  83                                 unsigned int len)
  84 {
  85         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  86         struct vlan_hdr *vhdr;
  87         unsigned int vhdrlen = 0;
  88         u16 vlan_tci = 0;
  89         int rc;
  90
  91         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  92                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
  93
  94                 vlan_tci = vlan->vlan_id;
  95                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  96                 vhdr->h_vlan_TCI = htons(vlan_tci);
  97
  98                 /*
  99                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 100                  *  put the length in here instead.
 101                  */
 102                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 103                         vhdr->h_vlan_encapsulated_proto = htons(type);
 104                 else
 105                         vhdr->h_vlan_encapsulated_proto = htons(len);
 106
 107                 skb->protocol = vlan->vlan_proto;
 108                 type = ntohs(vlan->vlan_proto);
 109                 vhdrlen = VLAN_HLEN;
 110         }
 111
 112         /* Before delegating work to the lower layer, enter our MAC-address */
 113         if (saddr == NULL)
 114                 saddr = dev->dev_addr;
 115
 116         /* Now make the underlying real hard header */
 117         dev = vlan->real_dev;
 118         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 119         if (rc > 0)
 120                 rc += vhdrlen;
 121         return rc;
 122 }
 123
 124 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 125 {
 126 #ifdef CONFIG_NET_POLL_CONTROLLER
 127         if (vlan->netpoll)
 128                 netpoll_send_skb(vlan->netpoll, skb);
 129 #else
 130         BUG();
 131 #endif
 132         return NETDEV_TX_OK;
 133 }
 134
 135 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 136                                             struct net_device *dev)
 137 {
 138         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 139         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 140         unsigned int len;
 141         int ret;
 142
 143         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 144          *
 145          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 146          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 147          */
 148         if (veth->h_vlan_proto != vlan->vlan_proto ||
 149             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 150                 u16 vlan_tci;
 151                 vlan_tci = vlan->vlan_id;
 152                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 153                 skb = __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 154         }
 155
 156         skb->dev = vlan->real_dev;
 157         len = skb->len;
 158         if (unlikely(netpoll_tx_running(dev)))
 159                 return vlan_netpoll_send_skb(vlan, skb);
 160
 161         ret = dev_queue_xmit(skb);
 162
 163         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 164                 struct vlan_pcpu_stats *stats;
 165
 166                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 167                 u64_stats_update_begin(&stats->syncp);
 168                 stats->tx_packets++;
 169                 stats->tx_bytes += len;
 170                 u64_stats_update_end(&stats->syncp);
 171         } else {
 172                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 173         }
 174
 175         return ret;
 176 }
 177
 178 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 179 {
 180         /* TODO: gotta make sure the underlying layer can handle it,
 181          * maybe an IFF_VLAN_CAPABLE flag for devices?
 182          */
 183         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 184                 return -ERANGE;
 185
 186         dev->mtu = new_mtu;
 187
 188         return 0;
 189 }
 190
 191 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 192                                    u32 skb_prio, u16 vlan_prio)
 193 {
 194         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 195
 196         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 197                 vlan->nr_ingress_mappings--;
 198         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 199                 vlan->nr_ingress_mappings++;
 200
 201         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 202 }
 203
 204 int vlan_dev_set_egress_priority(const struct net_device *dev,
 205                                  u32 skb_prio, u16 vlan_prio)
 206 {
 207         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 208         struct vlan_priority_tci_mapping *mp = NULL;
 209         struct vlan_priority_tci_mapping *np;
 210         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 211
 212         /* See if a priority mapping exists.. */
 213         mp = vlan->egress_priority_map[skb_prio & 0xF];
 214         while (mp) {
 215                 if (mp->priority == skb_prio) {
 216                         if (mp->vlan_qos && !vlan_qos)
 217                                 vlan->nr_egress_mappings--;
 218                         else if (!mp->vlan_qos && vlan_qos)
 219                                 vlan->nr_egress_mappings++;
 220                         mp->vlan_qos = vlan_qos;
 221                         return 0;
 222                 }
 223                 mp = mp->next;
 224         }
 225
 226         /* Create a new mapping then. */
 227         mp = vlan->egress_priority_map[skb_prio & 0xF];
 228         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 229         if (!np)
 230                 return -ENOBUFS;
 231
 232         np->next = mp;
 233         np->priority = skb_prio;
 234         np->vlan_qos = vlan_qos;
 235         /* Before inserting this element in hash table, make sure all its fields
 236          * are committed to memory.
 237          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 238          */
 239         smp_wmb();
 240         vlan->egress_priority_map[skb_prio & 0xF] = np;
 241         if (vlan_qos)
 242                 vlan->nr_egress_mappings++;
 243         return 0;
 244 }
 245
 246 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 247 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 248 {
 249         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 250         u32 old_flags = vlan->flags;
 251
 252         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 253                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 254                 return -EINVAL;
 255
 256         vlan->flags = (old_flags & ~mask) | (flags & mask);
 257
 258         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 259                 if (vlan->flags & VLAN_FLAG_GVRP)
 260                         vlan_gvrp_request_join(dev);
 261                 else
 262                         vlan_gvrp_request_leave(dev);
 263         }
 264
 265         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 266                 if (vlan->flags & VLAN_FLAG_MVRP)
 267                         vlan_mvrp_request_join(dev);
 268                 else
 269                         vlan_mvrp_request_leave(dev);
 270         }
 271         return 0;
 272 }
 273
 274 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 275 {
 276         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 277 }
 278
 279 static int vlan_dev_open(struct net_device *dev)
 280 {
 281         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 282         struct net_device *real_dev = vlan->real_dev;
 283         int err;
 284
 285         if (!(real_dev->flags & IFF_UP) &&
 286             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 287                 return -ENETDOWN;
 288
 289         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 290                 err = dev_uc_add(real_dev, dev->dev_addr);
 291                 if (err < 0)
 292                         goto out;
 293         }
 294
 295         if (dev->flags & IFF_ALLMULTI) {
 296                 err = dev_set_allmulti(real_dev, 1);
 297                 if (err < 0)
 298                         goto del_unicast;
 299         }
 300         if (dev->flags & IFF_PROMISC) {
 301                 err = dev_set_promiscuity(real_dev, 1);
 302                 if (err < 0)
 303                         goto clear_allmulti;
 304         }
 305
 306         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 307
 308         if (vlan->flags & VLAN_FLAG_GVRP)
 309                 vlan_gvrp_request_join(dev);
 310
 311         if (vlan->flags & VLAN_FLAG_MVRP)
 312                 vlan_mvrp_request_join(dev);
 313
 314         if (netif_carrier_ok(real_dev))
 315                 netif_carrier_on(dev);
 316         return 0;
 317
 318 clear_allmulti:
 319         if (dev->flags & IFF_ALLMULTI)
 320                 dev_set_allmulti(real_dev, -1);
 321 del_unicast:
 322         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 323                 dev_uc_del(real_dev, dev->dev_addr);
 324 out:
 325         netif_carrier_off(dev);
 326         return err;
 327 }
 328
 329 static int vlan_dev_stop(struct net_device *dev)
 330 {
 331         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 332         struct net_device *real_dev = vlan->real_dev;
 333
 334         dev_mc_unsync(real_dev, dev);
 335         dev_uc_unsync(real_dev, dev);
 336         if (dev->flags & IFF_ALLMULTI)
 337                 dev_set_allmulti(real_dev, -1);
 338         if (dev->flags & IFF_PROMISC)
 339                 dev_set_promiscuity(real_dev, -1);
 340
 341         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 342                 dev_uc_del(real_dev, dev->dev_addr);
 343
 344         netif_carrier_off(dev);
 345         return 0;
 346 }
 347
 348 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 349 {
 350         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 351         struct sockaddr *addr = p;
 352         int err;
 353
 354         if (!is_valid_ether_addr(addr->sa_data))
 355                 return -EADDRNOTAVAIL;
 356
 357         if (!(dev->flags & IFF_UP))
 358                 goto out;
 359
 360         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 361                 err = dev_uc_add(real_dev, addr->sa_data);
 362                 if (err < 0)
 363                         return err;
 364         }
 365
 366         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 367                 dev_uc_del(real_dev, dev->dev_addr);
 368
 369 out:
 370         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 371         return 0;
 372 }
 373
 374 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 375 {
 376         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 377         const struct net_device_ops *ops = real_dev->netdev_ops;
 378         struct ifreq ifrr;
 379         int err = -EOPNOTSUPP;
 380
 381         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 382         ifrr.ifr_ifru = ifr->ifr_ifru;
 383
 384         switch (cmd) {
 385         case SIOCGMIIPHY:
 386         case SIOCGMIIREG:
 387         case SIOCSMIIREG:
 388                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 389                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 390                 break;
 391         }
 392
 393         if (!err)
 394                 ifr->ifr_ifru = ifrr.ifr_ifru;
 395
 396         return err;
 397 }
 398
 399 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 400 {
 401         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 402         const struct net_device_ops *ops = real_dev->netdev_ops;
 403         int err = 0;
 404
 405         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 406                 err = ops->ndo_neigh_setup(real_dev, pa);
 407
 408         return err;
 409 }
 410
 411 #if IS_ENABLED(CONFIG_FCOE)
 412 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 413                                    struct scatterlist *sgl, unsigned int sgc)
 414 {
 415         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 416         const struct net_device_ops *ops = real_dev->netdev_ops;
 417         int rc = 0;
 418
 419         if (ops->ndo_fcoe_ddp_setup)
 420                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 421
 422         return rc;
 423 }
 424
 425 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 426 {
 427         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 428         const struct net_device_ops *ops = real_dev->netdev_ops;
 429         int len = 0;
 430
 431         if (ops->ndo_fcoe_ddp_done)
 432                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 433
 434         return len;
 435 }
 436
 437 static int vlan_dev_fcoe_enable(struct net_device *dev)
 438 {
 439         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 440         const struct net_device_ops *ops = real_dev->netdev_ops;
 441         int rc = -EINVAL;
 442
 443         if (ops->ndo_fcoe_enable)
 444                 rc = ops->ndo_fcoe_enable(real_dev);
 445         return rc;
 446 }
 447
 448 static int vlan_dev_fcoe_disable(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_disable)
 455                 rc = ops->ndo_fcoe_disable(real_dev);
 456         return rc;
 457 }
 458
 459 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 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_get_wwn)
 466                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 467         return rc;
 468 }
 469
 470 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 471                                     struct scatterlist *sgl, unsigned int sgc)
 472 {
 473         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 474         const struct net_device_ops *ops = real_dev->netdev_ops;
 475         int rc = 0;
 476
 477         if (ops->ndo_fcoe_ddp_target)
 478                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 479
 480         return rc;
 481 }
 482 #endif
 483
 484 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 485 {
 486         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 487
 488         if (dev->flags & IFF_UP) {
 489                 if (change & IFF_ALLMULTI)
 490                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 491                 if (change & IFF_PROMISC)
 492                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 493         }
 494 }
 495
 496 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 497 {
 498         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 499         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 500 }
 501
 502 /*
 503  * vlan network devices have devices nesting below it, and are a special
 504  * "super class" of normal network devices; split their locks off into a
 505  * separate class since they always nest.
 506  */
 507 static struct lock_class_key vlan_netdev_xmit_lock_key;
 508 static struct lock_class_key vlan_netdev_addr_lock_key;
 509
 510 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 511                                      struct netdev_queue *txq,
 512                                      void *_subclass)
 513 {
 514         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 515                                        &vlan_netdev_xmit_lock_key,
 516                                        *(int *)_subclass);
 517 }
 518
 519 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 520 {
 521         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 522                                        &vlan_netdev_addr_lock_key,
 523                                        subclass);
 524         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 525 }
 526
 527 static const struct header_ops vlan_header_ops = {
 528         .create  = vlan_dev_hard_header,
 529         .rebuild = vlan_dev_rebuild_header,
 530         .parse   = eth_header_parse,
 531 };
 532
 533 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 534                                      unsigned short type,
 535                                      const void *daddr, const void *saddr,
 536                                      unsigned int len)
 537 {
 538         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 539         struct net_device *real_dev = vlan->real_dev;
 540
 541         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 542 }
 543
 544 static const struct header_ops vlan_passthru_header_ops = {
 545         .create  = vlan_passthru_hard_header,
 546         .rebuild = dev_rebuild_header,
 547         .parse   = eth_header_parse,
 548 };
 549
 550 static struct device_type vlan_type = {
 551         .name   = "vlan",
 552 };
 553
 554 static const struct net_device_ops vlan_netdev_ops;
 555
 556 static int vlan_dev_init(struct net_device *dev)
 557 {
 558         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 559         int subclass = 0, i;
 560
 561         netif_carrier_off(dev);
 562
 563         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 564         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 565                                           IFF_MASTER | IFF_SLAVE);
 566         dev->iflink = real_dev->ifindex;
 567         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 568                                           (1<<__LINK_STATE_DORMANT))) |
 569                       (1<<__LINK_STATE_PRESENT);
 570
 571         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 572                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 573                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 574                            NETIF_F_ALL_FCOE;
 575
 576         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 577         dev->gso_max_size = real_dev->gso_max_size;
 578
 579         /* ipv6 shared card related stuff */
 580         dev->dev_id = real_dev->dev_id;
 581
 582         if (is_zero_ether_addr(dev->dev_addr))
 583                 eth_hw_addr_inherit(dev, real_dev);
 584         if (is_zero_ether_addr(dev->broadcast))
 585                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 586
 587 #if IS_ENABLED(CONFIG_FCOE)
 588         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 589 #endif
 590
 591         dev->needed_headroom = real_dev->needed_headroom;
 592         if (real_dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
 593                 dev->header_ops      = &vlan_passthru_header_ops;
 594                 dev->hard_header_len = real_dev->hard_header_len;
 595         } else {
 596                 dev->header_ops      = &vlan_header_ops;
 597                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 598         }
 599
 600         dev->netdev_ops = &vlan_netdev_ops;
 601
 602         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 603
 604         if (is_vlan_dev(real_dev))
 605                 subclass = 1;
 606
 607         vlan_dev_set_lockdep_class(dev, subclass);
 608
 609         vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 610         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 611                 return -ENOMEM;
 612
 613         for_each_possible_cpu(i) {
 614                 struct vlan_pcpu_stats *vlan_stat;
 615                 vlan_stat = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 616                 u64_stats_init(&vlan_stat->syncp);
 617         }
 618
 619
 620         return 0;
 621 }
 622
 623 static void vlan_dev_uninit(struct net_device *dev)
 624 {
 625         struct vlan_priority_tci_mapping *pm;
 626         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 627         int i;
 628
 629         free_percpu(vlan->vlan_pcpu_stats);
 630         vlan->vlan_pcpu_stats = NULL;
 631         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 632                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 633                         vlan->egress_priority_map[i] = pm->next;
 634                         kfree(pm);
 635                 }
 636         }
 637 }
 638
 639 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 640         netdev_features_t features)
 641 {
 642         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 643         netdev_features_t old_features = features;
 644
 645         features &= real_dev->vlan_features;
 646         features |= NETIF_F_RXCSUM;
 647         features &= real_dev->features;
 648
 649         features |= old_features & NETIF_F_SOFT_FEATURES;
 650         features |= NETIF_F_LLTX;
 651
 652         return features;
 653 }
 654
 655 static int vlan_ethtool_get_settings(struct net_device *dev,
 656                                      struct ethtool_cmd *cmd)
 657 {
 658         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 659
 660         return __ethtool_get_settings(vlan->real_dev, cmd);
 661 }
 662
 663 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 664                                      struct ethtool_drvinfo *info)
 665 {
 666         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 667         strlcpy(info->version, vlan_version, sizeof(info->version));
 668         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 669 }
 670
 671 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 672 {
 673
 674         if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
 675                 struct vlan_pcpu_stats *p;
 676                 u32 rx_errors = 0, tx_dropped = 0;
 677                 int i;
 678
 679                 for_each_possible_cpu(i) {
 680                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 681                         unsigned int start;
 682
 683                         p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 684                         do {
 685                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 686                                 rxpackets       = p->rx_packets;
 687                                 rxbytes         = p->rx_bytes;
 688                                 rxmulticast     = p->rx_multicast;
 689                                 txpackets       = p->tx_packets;
 690                                 txbytes         = p->tx_bytes;
 691                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 692
 693                         stats->rx_packets       += rxpackets;
 694                         stats->rx_bytes         += rxbytes;
 695                         stats->multicast        += rxmulticast;
 696                         stats->tx_packets       += txpackets;
 697                         stats->tx_bytes         += txbytes;
 698                         /* rx_errors & tx_dropped are u32 */
 699                         rx_errors       += p->rx_errors;
 700                         tx_dropped      += p->tx_dropped;
 701                 }
 702                 stats->rx_errors  = rx_errors;
 703                 stats->tx_dropped = tx_dropped;
 704         }
 705         return stats;
 706 }
 707
 708 #ifdef CONFIG_NET_POLL_CONTROLLER
 709 static void vlan_dev_poll_controller(struct net_device *dev)
 710 {
 711         return;
 712 }
 713
 714 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo,
 715                                   gfp_t gfp)
 716 {
 717         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 718         struct net_device *real_dev = vlan->real_dev;
 719         struct netpoll *netpoll;
 720         int err = 0;
 721
 722         netpoll = kzalloc(sizeof(*netpoll), gfp);
 723         err = -ENOMEM;
 724         if (!netpoll)
 725                 goto out;
 726
 727         err = __netpoll_setup(netpoll, real_dev, gfp);
 728         if (err) {
 729                 kfree(netpoll);
 730                 goto out;
 731         }
 732
 733         vlan->netpoll = netpoll;
 734
 735 out:
 736         return err;
 737 }
 738
 739 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 740 {
 741         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 742         struct netpoll *netpoll = vlan->netpoll;
 743
 744         if (!netpoll)
 745                 return;
 746
 747         vlan->netpoll = NULL;
 748
 749         __netpoll_free_async(netpoll);
 750 }
 751 #endif /* CONFIG_NET_POLL_CONTROLLER */
 752
 753 static const struct ethtool_ops vlan_ethtool_ops = {
 754         .get_settings           = vlan_ethtool_get_settings,
 755         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 756         .get_link               = ethtool_op_get_link,
 757 };
 758
 759 static const struct net_device_ops vlan_netdev_ops = {
 760         .ndo_change_mtu         = vlan_dev_change_mtu,
 761         .ndo_init               = vlan_dev_init,
 762         .ndo_uninit             = vlan_dev_uninit,
 763         .ndo_open               = vlan_dev_open,
 764         .ndo_stop               = vlan_dev_stop,
 765         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 766         .ndo_validate_addr      = eth_validate_addr,
 767         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 768         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 769         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 770         .ndo_do_ioctl           = vlan_dev_ioctl,
 771         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 772         .ndo_get_stats64        = vlan_dev_get_stats64,
 773 #if IS_ENABLED(CONFIG_FCOE)
 774         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 775         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 776         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 777         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 778         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 779         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 780 #endif
 781 #ifdef CONFIG_NET_POLL_CONTROLLER
 782         .ndo_poll_controller    = vlan_dev_poll_controller,
 783         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 784         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 785 #endif
 786         .ndo_fix_features       = vlan_dev_fix_features,
 787 };
 788
 789 void vlan_setup(struct net_device *dev)
 790 {
 791         ether_setup(dev);
 792
 793         dev->priv_flags         |= IFF_802_1Q_VLAN;
 794         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 795         dev->tx_queue_len       = 0;
 796
 797         dev->netdev_ops         = &vlan_netdev_ops;
 798         dev->destructor         = free_netdev;
 799         dev->ethtool_ops        = &vlan_ethtool_ops;
 800
 801         memset(dev->broadcast, 0, ETH_ALEN);
 802 }