Pileus Git - ~andy/linux/blob - 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 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         smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
  77
  78         mp = vlan_dev_priv(dev)->egress_priority_map[(skb->priority & 0xF)];
  79         while (mp) {
  80                 if (mp->priority == skb->priority) {
  81                         return mp->vlan_qos; /* This should already be shifted
  82                                               * to mask correctly with the
  83                                               * VLAN's TCI */
  84                 }
  85                 mp = mp->next;
  86         }
  87         return 0;
  88 }
  89
  90 /*
  91  *      Create the VLAN header for an arbitrary protocol layer
  92  *
  93  *      saddr=NULL      means use device source address
  94  *      daddr=NULL      means leave destination address (eg unresolved arp)
  95  *
  96  *  This is called when the SKB is moving down the stack towards the
  97  *  physical devices.
  98  */
  99 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 100                                 unsigned short type,
 101                                 const void *daddr, const void *saddr,
 102                                 unsigned int len)
 103 {
 104         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 105         struct vlan_hdr *vhdr;
 106         unsigned int vhdrlen = 0;
 107         u16 vlan_tci = 0;
 108         int rc;
 109
 110         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
 111                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 112
 113                 vlan_tci = vlan->vlan_id;
 114                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 115                 vhdr->h_vlan_TCI = htons(vlan_tci);
 116
 117                 /*
 118                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 119                  *  put the length in here instead.
 120                  */
 121                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 122                         vhdr->h_vlan_encapsulated_proto = htons(type);
 123                 else
 124                         vhdr->h_vlan_encapsulated_proto = htons(len);
 125
 126                 skb->protocol = vlan->vlan_proto;
 127                 type = ntohs(vlan->vlan_proto);
 128                 vhdrlen = VLAN_HLEN;
 129         }
 130
 131         /* Before delegating work to the lower layer, enter our MAC-address */
 132         if (saddr == NULL)
 133                 saddr = dev->dev_addr;
 134
 135         /* Now make the underlying real hard header */
 136         dev = vlan->real_dev;
 137         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 138         if (rc > 0)
 139                 rc += vhdrlen;
 140         return rc;
 141 }
 142
 143 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 144 {
 145 #ifdef CONFIG_NET_POLL_CONTROLLER
 146         if (vlan->netpoll)
 147                 netpoll_send_skb(vlan->netpoll, skb);
 148 #else
 149         BUG();
 150 #endif
 151         return NETDEV_TX_OK;
 152 }
 153
 154 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 155                                             struct net_device *dev)
 156 {
 157         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 158         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 159         unsigned int len;
 160         int ret;
 161
 162         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 163          *
 164          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 165          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 166          */
 167         if (veth->h_vlan_proto != vlan->vlan_proto ||
 168             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 169                 u16 vlan_tci;
 170                 vlan_tci = vlan->vlan_id;
 171                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 172                 skb = __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 173         }
 174
 175         skb->dev = vlan->real_dev;
 176         len = skb->len;
 177         if (unlikely(netpoll_tx_running(dev)))
 178                 return vlan_netpoll_send_skb(vlan, skb);
 179
 180         ret = dev_queue_xmit(skb);
 181
 182         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 183                 struct vlan_pcpu_stats *stats;
 184
 185                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 186                 u64_stats_update_begin(&stats->syncp);
 187                 stats->tx_packets++;
 188                 stats->tx_bytes += len;
 189                 u64_stats_update_end(&stats->syncp);
 190         } else {
 191                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 192         }
 193
 194         return ret;
 195 }
 196
 197 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 198 {
 199         /* TODO: gotta make sure the underlying layer can handle it,
 200          * maybe an IFF_VLAN_CAPABLE flag for devices?
 201          */
 202         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 203                 return -ERANGE;
 204
 205         dev->mtu = new_mtu;
 206
 207         return 0;
 208 }
 209
 210 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 211                                    u32 skb_prio, u16 vlan_prio)
 212 {
 213         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 214
 215         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 216                 vlan->nr_ingress_mappings--;
 217         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 218                 vlan->nr_ingress_mappings++;
 219
 220         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 221 }
 222
 223 int vlan_dev_set_egress_priority(const struct net_device *dev,
 224                                  u32 skb_prio, u16 vlan_prio)
 225 {
 226         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 227         struct vlan_priority_tci_mapping *mp = NULL;
 228         struct vlan_priority_tci_mapping *np;
 229         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 230
 231         /* See if a priority mapping exists.. */
 232         mp = vlan->egress_priority_map[skb_prio & 0xF];
 233         while (mp) {
 234                 if (mp->priority == skb_prio) {
 235                         if (mp->vlan_qos && !vlan_qos)
 236                                 vlan->nr_egress_mappings--;
 237                         else if (!mp->vlan_qos && vlan_qos)
 238                                 vlan->nr_egress_mappings++;
 239                         mp->vlan_qos = vlan_qos;
 240                         return 0;
 241                 }
 242                 mp = mp->next;
 243         }
 244
 245         /* Create a new mapping then. */
 246         mp = vlan->egress_priority_map[skb_prio & 0xF];
 247         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 248         if (!np)
 249                 return -ENOBUFS;
 250
 251         np->next = mp;
 252         np->priority = skb_prio;
 253         np->vlan_qos = vlan_qos;
 254         /* Before inserting this element in hash table, make sure all its fields
 255          * are committed to memory.
 256          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 257          */
 258         smp_wmb();
 259         vlan->egress_priority_map[skb_prio & 0xF] = np;
 260         if (vlan_qos)
 261                 vlan->nr_egress_mappings++;
 262         return 0;
 263 }
 264
 265 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 266 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 267 {
 268         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 269         u32 old_flags = vlan->flags;
 270
 271         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 272                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 273                 return -EINVAL;
 274
 275         vlan->flags = (old_flags & ~mask) | (flags & mask);
 276
 277         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 278                 if (vlan->flags & VLAN_FLAG_GVRP)
 279                         vlan_gvrp_request_join(dev);
 280                 else
 281                         vlan_gvrp_request_leave(dev);
 282         }
 283
 284         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 285                 if (vlan->flags & VLAN_FLAG_MVRP)
 286                         vlan_mvrp_request_join(dev);
 287                 else
 288                         vlan_mvrp_request_leave(dev);
 289         }
 290         return 0;
 291 }
 292
 293 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 294 {
 295         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 296 }
 297
 298 static int vlan_dev_open(struct net_device *dev)
 299 {
 300         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 301         struct net_device *real_dev = vlan->real_dev;
 302         int err;
 303
 304         if (!(real_dev->flags & IFF_UP) &&
 305             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 306                 return -ENETDOWN;
 307
 308         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 309                 err = dev_uc_add(real_dev, dev->dev_addr);
 310                 if (err < 0)
 311                         goto out;
 312         }
 313
 314         if (dev->flags & IFF_ALLMULTI) {
 315                 err = dev_set_allmulti(real_dev, 1);
 316                 if (err < 0)
 317                         goto del_unicast;
 318         }
 319         if (dev->flags & IFF_PROMISC) {
 320                 err = dev_set_promiscuity(real_dev, 1);
 321                 if (err < 0)
 322                         goto clear_allmulti;
 323         }
 324
 325         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 326
 327         if (vlan->flags & VLAN_FLAG_GVRP)
 328                 vlan_gvrp_request_join(dev);
 329
 330         if (vlan->flags & VLAN_FLAG_MVRP)
 331                 vlan_mvrp_request_join(dev);
 332
 333         if (netif_carrier_ok(real_dev))
 334                 netif_carrier_on(dev);
 335         return 0;
 336
 337 clear_allmulti:
 338         if (dev->flags & IFF_ALLMULTI)
 339                 dev_set_allmulti(real_dev, -1);
 340 del_unicast:
 341         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 342                 dev_uc_del(real_dev, dev->dev_addr);
 343 out:
 344         netif_carrier_off(dev);
 345         return err;
 346 }
 347
 348 static int vlan_dev_stop(struct net_device *dev)
 349 {
 350         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 351         struct net_device *real_dev = vlan->real_dev;
 352
 353         dev_mc_unsync(real_dev, dev);
 354         dev_uc_unsync(real_dev, dev);
 355         if (dev->flags & IFF_ALLMULTI)
 356                 dev_set_allmulti(real_dev, -1);
 357         if (dev->flags & IFF_PROMISC)
 358                 dev_set_promiscuity(real_dev, -1);
 359
 360         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 361                 dev_uc_del(real_dev, dev->dev_addr);
 362
 363         netif_carrier_off(dev);
 364         return 0;
 365 }
 366
 367 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 368 {
 369         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 370         struct sockaddr *addr = p;
 371         int err;
 372
 373         if (!is_valid_ether_addr(addr->sa_data))
 374                 return -EADDRNOTAVAIL;
 375
 376         if (!(dev->flags & IFF_UP))
 377                 goto out;
 378
 379         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 380                 err = dev_uc_add(real_dev, addr->sa_data);
 381                 if (err < 0)
 382                         return err;
 383         }
 384
 385         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 386                 dev_uc_del(real_dev, dev->dev_addr);
 387
 388 out:
 389         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 390         return 0;
 391 }
 392
 393 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 394 {
 395         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 396         const struct net_device_ops *ops = real_dev->netdev_ops;
 397         struct ifreq ifrr;
 398         int err = -EOPNOTSUPP;
 399
 400         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 401         ifrr.ifr_ifru = ifr->ifr_ifru;
 402
 403         switch (cmd) {
 404         case SIOCGMIIPHY:
 405         case SIOCGMIIREG:
 406         case SIOCSMIIREG:
 407                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 408                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 409                 break;
 410         }
 411
 412         if (!err)
 413                 ifr->ifr_ifru = ifrr.ifr_ifru;
 414
 415         return err;
 416 }
 417
 418 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 419 {
 420         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 421         const struct net_device_ops *ops = real_dev->netdev_ops;
 422         int err = 0;
 423
 424         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 425                 err = ops->ndo_neigh_setup(real_dev, pa);
 426
 427         return err;
 428 }
 429
 430 #if IS_ENABLED(CONFIG_FCOE)
 431 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 432                                    struct scatterlist *sgl, unsigned int sgc)
 433 {
 434         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 435         const struct net_device_ops *ops = real_dev->netdev_ops;
 436         int rc = 0;
 437
 438         if (ops->ndo_fcoe_ddp_setup)
 439                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 440
 441         return rc;
 442 }
 443
 444 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 445 {
 446         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 447         const struct net_device_ops *ops = real_dev->netdev_ops;
 448         int len = 0;
 449
 450         if (ops->ndo_fcoe_ddp_done)
 451                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 452
 453         return len;
 454 }
 455
 456 static int vlan_dev_fcoe_enable(struct net_device *dev)
 457 {
 458         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 459         const struct net_device_ops *ops = real_dev->netdev_ops;
 460         int rc = -EINVAL;
 461
 462         if (ops->ndo_fcoe_enable)
 463                 rc = ops->ndo_fcoe_enable(real_dev);
 464         return rc;
 465 }
 466
 467 static int vlan_dev_fcoe_disable(struct net_device *dev)
 468 {
 469         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 470         const struct net_device_ops *ops = real_dev->netdev_ops;
 471         int rc = -EINVAL;
 472
 473         if (ops->ndo_fcoe_disable)
 474                 rc = ops->ndo_fcoe_disable(real_dev);
 475         return rc;
 476 }
 477
 478 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 479 {
 480         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 481         const struct net_device_ops *ops = real_dev->netdev_ops;
 482         int rc = -EINVAL;
 483
 484         if (ops->ndo_fcoe_get_wwn)
 485                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 486         return rc;
 487 }
 488
 489 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 490                                     struct scatterlist *sgl, unsigned int sgc)
 491 {
 492         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 493         const struct net_device_ops *ops = real_dev->netdev_ops;
 494         int rc = 0;
 495
 496         if (ops->ndo_fcoe_ddp_target)
 497                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 498
 499         return rc;
 500 }
 501 #endif
 502
 503 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 504 {
 505         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 506
 507         if (dev->flags & IFF_UP) {
 508                 if (change & IFF_ALLMULTI)
 509                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 510                 if (change & IFF_PROMISC)
 511                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 512         }
 513 }
 514
 515 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 516 {
 517         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 518         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 519 }
 520
 521 /*
 522  * vlan network devices have devices nesting below it, and are a special
 523  * "super class" of normal network devices; split their locks off into a
 524  * separate class since they always nest.
 525  */
 526 static struct lock_class_key vlan_netdev_xmit_lock_key;
 527 static struct lock_class_key vlan_netdev_addr_lock_key;
 528
 529 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 530                                      struct netdev_queue *txq,
 531                                      void *_subclass)
 532 {
 533         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 534                                        &vlan_netdev_xmit_lock_key,
 535                                        *(int *)_subclass);
 536 }
 537
 538 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 539 {
 540         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 541                                        &vlan_netdev_addr_lock_key,
 542                                        subclass);
 543         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 544 }
 545
 546 static const struct header_ops vlan_header_ops = {
 547         .create  = vlan_dev_hard_header,
 548         .rebuild = vlan_dev_rebuild_header,
 549         .parse   = eth_header_parse,
 550 };
 551
 552 static struct device_type vlan_type = {
 553         .name   = "vlan",
 554 };
 555
 556 static const struct net_device_ops vlan_netdev_ops;
 557
 558 static int vlan_dev_init(struct net_device *dev)
 559 {
 560         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 561         int subclass = 0;
 562
 563         netif_carrier_off(dev);
 564
 565         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 566         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 567                                           IFF_MASTER | IFF_SLAVE);
 568         dev->iflink = real_dev->ifindex;
 569         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 570                                           (1<<__LINK_STATE_DORMANT))) |
 571                       (1<<__LINK_STATE_PRESENT);
 572
 573         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 574                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 575                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 576                            NETIF_F_ALL_FCOE;
 577
 578         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 579         dev->gso_max_size = real_dev->gso_max_size;
 580
 581         /* ipv6 shared card related stuff */
 582         dev->dev_id = real_dev->dev_id;
 583
 584         if (is_zero_ether_addr(dev->dev_addr))
 585                 eth_hw_addr_inherit(dev, real_dev);
 586         if (is_zero_ether_addr(dev->broadcast))
 587                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 588
 589 #if IS_ENABLED(CONFIG_FCOE)
 590         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 591 #endif
 592
 593         dev->needed_headroom = real_dev->needed_headroom;
 594         if (real_dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
 595                 dev->header_ops      = real_dev->header_ops;
 596                 dev->hard_header_len = real_dev->hard_header_len;
 597         } else {
 598                 dev->header_ops      = &vlan_header_ops;
 599                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 600         }
 601
 602         dev->netdev_ops = &vlan_netdev_ops;
 603
 604         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 605
 606         if (is_vlan_dev(real_dev))
 607                 subclass = 1;
 608
 609         vlan_dev_set_lockdep_class(dev, subclass);
 610
 611         vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 612         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 613                 return -ENOMEM;
 614
 615         return 0;
 616 }
 617
 618 static void vlan_dev_uninit(struct net_device *dev)
 619 {
 620         struct vlan_priority_tci_mapping *pm;
 621         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 622         int i;
 623
 624         free_percpu(vlan->vlan_pcpu_stats);
 625         vlan->vlan_pcpu_stats = NULL;
 626         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 627                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 628                         vlan->egress_priority_map[i] = pm->next;
 629                         kfree(pm);
 630                 }
 631         }
 632 }
 633
 634 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 635         netdev_features_t features)
 636 {
 637         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 638         netdev_features_t old_features = features;
 639
 640         features &= real_dev->vlan_features;
 641         features |= NETIF_F_RXCSUM;
 642         features &= real_dev->features;
 643
 644         features |= old_features & NETIF_F_SOFT_FEATURES;
 645         features |= NETIF_F_LLTX;
 646
 647         return features;
 648 }
 649
 650 static int vlan_ethtool_get_settings(struct net_device *dev,
 651                                      struct ethtool_cmd *cmd)
 652 {
 653         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 654
 655         return __ethtool_get_settings(vlan->real_dev, cmd);
 656 }
 657
 658 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 659                                      struct ethtool_drvinfo *info)
 660 {
 661         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 662         strlcpy(info->version, vlan_version, sizeof(info->version));
 663         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 664 }
 665
 666 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 667 {
 668
 669         if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
 670                 struct vlan_pcpu_stats *p;
 671                 u32 rx_errors = 0, tx_dropped = 0;
 672                 int i;
 673
 674                 for_each_possible_cpu(i) {
 675                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 676                         unsigned int start;
 677
 678                         p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 679                         do {
 680                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 681                                 rxpackets       = p->rx_packets;
 682                                 rxbytes         = p->rx_bytes;
 683                                 rxmulticast     = p->rx_multicast;
 684                                 txpackets       = p->tx_packets;
 685                                 txbytes         = p->tx_bytes;
 686                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 687
 688                         stats->rx_packets       += rxpackets;
 689                         stats->rx_bytes         += rxbytes;
 690                         stats->multicast        += rxmulticast;
 691                         stats->tx_packets       += txpackets;
 692                         stats->tx_bytes         += txbytes;
 693                         /* rx_errors & tx_dropped are u32 */
 694                         rx_errors       += p->rx_errors;
 695                         tx_dropped      += p->tx_dropped;
 696                 }
 697                 stats->rx_errors  = rx_errors;
 698                 stats->tx_dropped = tx_dropped;
 699         }
 700         return stats;
 701 }
 702
 703 #ifdef CONFIG_NET_POLL_CONTROLLER
 704 static void vlan_dev_poll_controller(struct net_device *dev)
 705 {
 706         return;
 707 }
 708
 709 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo,
 710                                   gfp_t gfp)
 711 {
 712         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 713         struct net_device *real_dev = vlan->real_dev;
 714         struct netpoll *netpoll;
 715         int err = 0;
 716
 717         netpoll = kzalloc(sizeof(*netpoll), gfp);
 718         err = -ENOMEM;
 719         if (!netpoll)
 720                 goto out;
 721
 722         err = __netpoll_setup(netpoll, real_dev, gfp);
 723         if (err) {
 724                 kfree(netpoll);
 725                 goto out;
 726         }
 727
 728         vlan->netpoll = netpoll;
 729
 730 out:
 731         return err;
 732 }
 733
 734 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 735 {
 736         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 737         struct netpoll *netpoll = vlan->netpoll;
 738
 739         if (!netpoll)
 740                 return;
 741
 742         vlan->netpoll = NULL;
 743
 744         __netpoll_free_async(netpoll);
 745 }
 746 #endif /* CONFIG_NET_POLL_CONTROLLER */
 747
 748 static const struct ethtool_ops vlan_ethtool_ops = {
 749         .get_settings           = vlan_ethtool_get_settings,
 750         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 751         .get_link               = ethtool_op_get_link,
 752 };
 753
 754 static const struct net_device_ops vlan_netdev_ops = {
 755         .ndo_change_mtu         = vlan_dev_change_mtu,
 756         .ndo_init               = vlan_dev_init,
 757         .ndo_uninit             = vlan_dev_uninit,
 758         .ndo_open               = vlan_dev_open,
 759         .ndo_stop               = vlan_dev_stop,
 760         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 761         .ndo_validate_addr      = eth_validate_addr,
 762         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 763         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 764         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 765         .ndo_do_ioctl           = vlan_dev_ioctl,
 766         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 767         .ndo_get_stats64        = vlan_dev_get_stats64,
 768 #if IS_ENABLED(CONFIG_FCOE)
 769         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 770         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 771         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 772         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 773         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 774         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 775 #endif
 776 #ifdef CONFIG_NET_POLL_CONTROLLER
 777         .ndo_poll_controller    = vlan_dev_poll_controller,
 778         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 779         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 780 #endif
 781         .ndo_fix_features       = vlan_dev_fix_features,
 782 };
 783
 784 void vlan_setup(struct net_device *dev)
 785 {
 786         ether_setup(dev);
 787
 788         dev->priv_flags         |= IFF_802_1Q_VLAN;
 789         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 790         dev->tx_queue_len       = 0;
 791
 792         dev->netdev_ops         = &vlan_netdev_ops;
 793         dev->destructor         = free_netdev;
 794         dev->ethtool_ops        = &vlan_ethtool_ops;
 795
 796         memset(dev->broadcast, 0, ETH_ALEN);
 797 }