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/net_tstamp.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <net/arp.h>
  33 #include <net/switchdev.h>
  34
  35 #include "vlan.h"
  36 #include "vlanproc.h"
  37 #include <linux/if_vlan.h>
  38 #include <linux/netpoll.h>
  39
  40 /*
  41  *      Create the VLAN header for an arbitrary protocol layer
  42  *
  43  *      saddr=NULL      means use device source address
  44  *      daddr=NULL      means leave destination address (eg unresolved arp)
  45  *
  46  *  This is called when the SKB is moving down the stack towards the
  47  *  physical devices.
  48  */
  49 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  50                                 unsigned short type,
  51                                 const void *daddr, const void *saddr,
  52                                 unsigned int len)
  53 {
  54         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  55         struct vlan_hdr *vhdr;
  56         unsigned int vhdrlen = 0;
  57         u16 vlan_tci = 0;
  58         int rc;
  59
  60         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  61                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
  62
  63                 vlan_tci = vlan->vlan_id;
  64                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  65                 vhdr->h_vlan_TCI = htons(vlan_tci);
  66
  67                 /*
  68                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  69                  *  put the length in here instead.
  70                  */
  71                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  72                         vhdr->h_vlan_encapsulated_proto = htons(type);
  73                 else
  74                         vhdr->h_vlan_encapsulated_proto = htons(len);
  75
  76                 skb->protocol = vlan->vlan_proto;
  77                 type = ntohs(vlan->vlan_proto);
  78                 vhdrlen = VLAN_HLEN;
  79         }
  80
  81         /* Before delegating work to the lower layer, enter our MAC-address */
  82         if (saddr == NULL)
  83                 saddr = dev->dev_addr;
  84
  85         /* Now make the underlying real hard header */
  86         dev = vlan->real_dev;
  87         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  88         if (rc > 0)
  89                 rc += vhdrlen;
  90         return rc;
  91 }
  92
  93 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  94 {
  95 #ifdef CONFIG_NET_POLL_CONTROLLER
  96         if (vlan->netpoll)
  97                 netpoll_send_skb(vlan->netpoll, skb);
  98 #else
  99         BUG();
 100 #endif
 101         return NETDEV_TX_OK;
 102 }
 103
 104 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 105                                             struct net_device *dev)
 106 {
 107         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 108         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 109         unsigned int len;
 110         int ret;
 111
 112         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 113          *
 114          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 115          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 116          */
 117         if (veth->h_vlan_proto != vlan->vlan_proto ||
 118             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 119                 u16 vlan_tci;
 120                 vlan_tci = vlan->vlan_id;
 121                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 122                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 123         }
 124
 125         skb->dev = vlan->real_dev;
 126         len = skb->len;
 127         if (unlikely(netpoll_tx_running(dev)))
 128                 return vlan_netpoll_send_skb(vlan, skb);
 129
 130         ret = dev_queue_xmit(skb);
 131
 132         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 133                 struct vlan_pcpu_stats *stats;
 134
 135                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 136                 u64_stats_update_begin(&stats->syncp);
 137                 stats->tx_packets++;
 138                 stats->tx_bytes += len;
 139                 u64_stats_update_end(&stats->syncp);
 140         } else {
 141                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 142         }
 143
 144         return ret;
 145 }
 146
 147 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 148 {
 149         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 150         unsigned int max_mtu = real_dev->mtu;
 151
 152         if (netif_reduces_vlan_mtu(real_dev))
 153                 max_mtu -= VLAN_HLEN;
 154         if (max_mtu < new_mtu)
 155                 return -ERANGE;
 156
 157         dev->mtu = new_mtu;
 158
 159         return 0;
 160 }
 161
 162 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 163                                    u32 skb_prio, u16 vlan_prio)
 164 {
 165         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 166
 167         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 168                 vlan->nr_ingress_mappings--;
 169         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 170                 vlan->nr_ingress_mappings++;
 171
 172         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 173 }
 174
 175 int vlan_dev_set_egress_priority(const struct net_device *dev,
 176                                  u32 skb_prio, u16 vlan_prio)
 177 {
 178         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 179         struct vlan_priority_tci_mapping *mp = NULL;
 180         struct vlan_priority_tci_mapping *np;
 181         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 182
 183         /* See if a priority mapping exists.. */
 184         mp = vlan->egress_priority_map[skb_prio & 0xF];
 185         while (mp) {
 186                 if (mp->priority == skb_prio) {
 187                         if (mp->vlan_qos && !vlan_qos)
 188                                 vlan->nr_egress_mappings--;
 189                         else if (!mp->vlan_qos && vlan_qos)
 190                                 vlan->nr_egress_mappings++;
 191                         mp->vlan_qos = vlan_qos;
 192                         return 0;
 193                 }
 194                 mp = mp->next;
 195         }
 196
 197         /* Create a new mapping then. */
 198         mp = vlan->egress_priority_map[skb_prio & 0xF];
 199         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 200         if (!np)
 201                 return -ENOBUFS;
 202
 203         np->next = mp;
 204         np->priority = skb_prio;
 205         np->vlan_qos = vlan_qos;
 206         /* Before inserting this element in hash table, make sure all its fields
 207          * are committed to memory.
 208          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 209          */
 210         smp_wmb();
 211         vlan->egress_priority_map[skb_prio & 0xF] = np;
 212         if (vlan_qos)
 213                 vlan->nr_egress_mappings++;
 214         return 0;
 215 }
 216
 217 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 218 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 219 {
 220         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 221         u32 old_flags = vlan->flags;
 222
 223         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 224                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 225                 return -EINVAL;
 226
 227         vlan->flags = (old_flags & ~mask) | (flags & mask);
 228
 229         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 230                 if (vlan->flags & VLAN_FLAG_GVRP)
 231                         vlan_gvrp_request_join(dev);
 232                 else
 233                         vlan_gvrp_request_leave(dev);
 234         }
 235
 236         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 237                 if (vlan->flags & VLAN_FLAG_MVRP)
 238                         vlan_mvrp_request_join(dev);
 239                 else
 240                         vlan_mvrp_request_leave(dev);
 241         }
 242         return 0;
 243 }
 244
 245 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 246 {
 247         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 248 }
 249
 250 bool vlan_dev_inherit_address(struct net_device *dev,
 251                               struct net_device *real_dev)
 252 {
 253         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 254                 return false;
 255
 256         ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 257         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 258         return true;
 259 }
 260
 261 static int vlan_dev_open(struct net_device *dev)
 262 {
 263         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 264         struct net_device *real_dev = vlan->real_dev;
 265         int err;
 266
 267         if (!(real_dev->flags & IFF_UP) &&
 268             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 269                 return -ENETDOWN;
 270
 271         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 272             !vlan_dev_inherit_address(dev, real_dev)) {
 273                 err = dev_uc_add(real_dev, dev->dev_addr);
 274                 if (err < 0)
 275                         goto out;
 276         }
 277
 278         if (dev->flags & IFF_ALLMULTI) {
 279                 err = dev_set_allmulti(real_dev, 1);
 280                 if (err < 0)
 281                         goto del_unicast;
 282         }
 283         if (dev->flags & IFF_PROMISC) {
 284                 err = dev_set_promiscuity(real_dev, 1);
 285                 if (err < 0)
 286                         goto clear_allmulti;
 287         }
 288
 289         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 290
 291         if (vlan->flags & VLAN_FLAG_GVRP)
 292                 vlan_gvrp_request_join(dev);
 293
 294         if (vlan->flags & VLAN_FLAG_MVRP)
 295                 vlan_mvrp_request_join(dev);
 296
 297         if (netif_carrier_ok(real_dev))
 298                 netif_carrier_on(dev);
 299         return 0;
 300
 301 clear_allmulti:
 302         if (dev->flags & IFF_ALLMULTI)
 303                 dev_set_allmulti(real_dev, -1);
 304 del_unicast:
 305         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 306                 dev_uc_del(real_dev, dev->dev_addr);
 307 out:
 308         netif_carrier_off(dev);
 309         return err;
 310 }
 311
 312 static int vlan_dev_stop(struct net_device *dev)
 313 {
 314         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 315         struct net_device *real_dev = vlan->real_dev;
 316
 317         dev_mc_unsync(real_dev, dev);
 318         dev_uc_unsync(real_dev, dev);
 319         if (dev->flags & IFF_ALLMULTI)
 320                 dev_set_allmulti(real_dev, -1);
 321         if (dev->flags & IFF_PROMISC)
 322                 dev_set_promiscuity(real_dev, -1);
 323
 324         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 325                 dev_uc_del(real_dev, dev->dev_addr);
 326
 327         netif_carrier_off(dev);
 328         return 0;
 329 }
 330
 331 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 332 {
 333         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 334         struct sockaddr *addr = p;
 335         int err;
 336
 337         if (!is_valid_ether_addr(addr->sa_data))
 338                 return -EADDRNOTAVAIL;
 339
 340         if (!(dev->flags & IFF_UP))
 341                 goto out;
 342
 343         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 344                 err = dev_uc_add(real_dev, addr->sa_data);
 345                 if (err < 0)
 346                         return err;
 347         }
 348
 349         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 350                 dev_uc_del(real_dev, dev->dev_addr);
 351
 352 out:
 353         ether_addr_copy(dev->dev_addr, addr->sa_data);
 354         return 0;
 355 }
 356
 357 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 358 {
 359         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 360         const struct net_device_ops *ops = real_dev->netdev_ops;
 361         struct ifreq ifrr;
 362         int err = -EOPNOTSUPP;
 363
 364         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 365         ifrr.ifr_ifru = ifr->ifr_ifru;
 366
 367         switch (cmd) {
 368         case SIOCGMIIPHY:
 369         case SIOCGMIIREG:
 370         case SIOCSMIIREG:
 371         case SIOCSHWTSTAMP:
 372         case SIOCGHWTSTAMP:
 373                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 374                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 375                 break;
 376         }
 377
 378         if (!err)
 379                 ifr->ifr_ifru = ifrr.ifr_ifru;
 380
 381         return err;
 382 }
 383
 384 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 385 {
 386         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 387         const struct net_device_ops *ops = real_dev->netdev_ops;
 388         int err = 0;
 389
 390         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 391                 err = ops->ndo_neigh_setup(real_dev, pa);
 392
 393         return err;
 394 }
 395
 396 #if IS_ENABLED(CONFIG_FCOE)
 397 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 398                                    struct scatterlist *sgl, unsigned int sgc)
 399 {
 400         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 401         const struct net_device_ops *ops = real_dev->netdev_ops;
 402         int rc = 0;
 403
 404         if (ops->ndo_fcoe_ddp_setup)
 405                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 406
 407         return rc;
 408 }
 409
 410 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 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 len = 0;
 415
 416         if (ops->ndo_fcoe_ddp_done)
 417                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 418
 419         return len;
 420 }
 421
 422 static int vlan_dev_fcoe_enable(struct net_device *dev)
 423 {
 424         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 425         const struct net_device_ops *ops = real_dev->netdev_ops;
 426         int rc = -EINVAL;
 427
 428         if (ops->ndo_fcoe_enable)
 429                 rc = ops->ndo_fcoe_enable(real_dev);
 430         return rc;
 431 }
 432
 433 static int vlan_dev_fcoe_disable(struct net_device *dev)
 434 {
 435         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 436         const struct net_device_ops *ops = real_dev->netdev_ops;
 437         int rc = -EINVAL;
 438
 439         if (ops->ndo_fcoe_disable)
 440                 rc = ops->ndo_fcoe_disable(real_dev);
 441         return rc;
 442 }
 443
 444 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 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 rc = -EINVAL;
 449
 450         if (ops->ndo_fcoe_get_wwn)
 451                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 452         return rc;
 453 }
 454
 455 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 456                                     struct scatterlist *sgl, unsigned int sgc)
 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 = 0;
 461
 462         if (ops->ndo_fcoe_ddp_target)
 463                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 464
 465         return rc;
 466 }
 467 #endif
 468
 469 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 470 {
 471         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 472
 473         if (dev->flags & IFF_UP) {
 474                 if (change & IFF_ALLMULTI)
 475                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 476                 if (change & IFF_PROMISC)
 477                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 478         }
 479 }
 480
 481 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 482 {
 483         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 484         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 485 }
 486
 487 /*
 488  * vlan network devices have devices nesting below it, and are a special
 489  * "super class" of normal network devices; split their locks off into a
 490  * separate class since they always nest.
 491  */
 492 static struct lock_class_key vlan_netdev_xmit_lock_key;
 493 static struct lock_class_key vlan_netdev_addr_lock_key;
 494
 495 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 496                                      struct netdev_queue *txq,
 497                                      void *_subclass)
 498 {
 499         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 500                                        &vlan_netdev_xmit_lock_key,
 501                                        *(int *)_subclass);
 502 }
 503
 504 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 505 {
 506         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 507                                        &vlan_netdev_addr_lock_key,
 508                                        subclass);
 509         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 510 }
 511
 512 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 513 {
 514         return vlan_dev_priv(dev)->nest_level;
 515 }
 516
 517 static const struct header_ops vlan_header_ops = {
 518         .create  = vlan_dev_hard_header,
 519         .parse   = eth_header_parse,
 520 };
 521
 522 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 523                                      unsigned short type,
 524                                      const void *daddr, const void *saddr,
 525                                      unsigned int len)
 526 {
 527         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 528         struct net_device *real_dev = vlan->real_dev;
 529
 530         if (saddr == NULL)
 531                 saddr = dev->dev_addr;
 532
 533         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 534 }
 535
 536 static const struct header_ops vlan_passthru_header_ops = {
 537         .create  = vlan_passthru_hard_header,
 538         .parse   = eth_header_parse,
 539 };
 540
 541 static struct device_type vlan_type = {
 542         .name   = "vlan",
 543 };
 544
 545 static const struct net_device_ops vlan_netdev_ops;
 546
 547 static int vlan_dev_init(struct net_device *dev)
 548 {
 549         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 550
 551         netif_carrier_off(dev);
 552
 553         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 554         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 555                                           IFF_MASTER | IFF_SLAVE);
 556         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 557                                           (1<<__LINK_STATE_DORMANT))) |
 558                       (1<<__LINK_STATE_PRESENT);
 559
 560         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 561                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 562                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 563                            NETIF_F_ALL_FCOE;
 564
 565         dev->features |= real_dev->vlan_features | NETIF_F_LLTX |
 566                          NETIF_F_GSO_SOFTWARE;
 567         dev->gso_max_size = real_dev->gso_max_size;
 568         dev->gso_max_segs = real_dev->gso_max_segs;
 569         if (dev->features & NETIF_F_VLAN_FEATURES)
 570                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 571
 572         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 573
 574         /* ipv6 shared card related stuff */
 575         dev->dev_id = real_dev->dev_id;
 576
 577         if (is_zero_ether_addr(dev->dev_addr)) {
 578                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 579                 dev->addr_assign_type = NET_ADDR_STOLEN;
 580         }
 581         if (is_zero_ether_addr(dev->broadcast))
 582                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 583
 584 #if IS_ENABLED(CONFIG_FCOE)
 585         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 586 #endif
 587
 588         dev->needed_headroom = real_dev->needed_headroom;
 589         if (vlan_hw_offload_capable(real_dev->features,
 590                                     vlan_dev_priv(dev)->vlan_proto)) {
 591                 dev->header_ops      = &vlan_passthru_header_ops;
 592                 dev->hard_header_len = real_dev->hard_header_len;
 593         } else {
 594                 dev->header_ops      = &vlan_header_ops;
 595                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 596         }
 597
 598         dev->netdev_ops = &vlan_netdev_ops;
 599
 600         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 601
 602         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 603
 604         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 605         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 606                 return -ENOMEM;
 607
 608         return 0;
 609 }
 610
 611 static void vlan_dev_uninit(struct net_device *dev)
 612 {
 613         struct vlan_priority_tci_mapping *pm;
 614         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 615         int i;
 616
 617         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 618                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 619                         vlan->egress_priority_map[i] = pm->next;
 620                         kfree(pm);
 621                 }
 622         }
 623 }
 624
 625 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 626         netdev_features_t features)
 627 {
 628         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 629         netdev_features_t old_features = features;
 630
 631         features = netdev_intersect_features(features, real_dev->vlan_features);
 632         features |= NETIF_F_RXCSUM;
 633         features = netdev_intersect_features(features, real_dev->features);
 634
 635         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 636         features |= NETIF_F_LLTX;
 637
 638         return features;
 639 }
 640
 641 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 642                                            struct ethtool_link_ksettings *cmd)
 643 {
 644         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 645
 646         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 647 }
 648
 649 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 650                                      struct ethtool_drvinfo *info)
 651 {
 652         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 653         strlcpy(info->version, vlan_version, sizeof(info->version));
 654         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 655 }
 656
 657 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 658                                     struct ethtool_ts_info *info)
 659 {
 660         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 661         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 662
 663         if (ops->get_ts_info) {
 664                 return ops->get_ts_info(vlan->real_dev, info);
 665         } else {
 666                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 667                         SOF_TIMESTAMPING_SOFTWARE;
 668                 info->phc_index = -1;
 669         }
 670
 671         return 0;
 672 }
 673
 674 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 675 {
 676         struct vlan_pcpu_stats *p;
 677         u32 rx_errors = 0, tx_dropped = 0;
 678         int i;
 679
 680         for_each_possible_cpu(i) {
 681                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 682                 unsigned int start;
 683
 684                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 685                 do {
 686                         start = u64_stats_fetch_begin_irq(&p->syncp);
 687                         rxpackets       = p->rx_packets;
 688                         rxbytes         = p->rx_bytes;
 689                         rxmulticast     = p->rx_multicast;
 690                         txpackets       = p->tx_packets;
 691                         txbytes         = p->tx_bytes;
 692                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 693
 694                 stats->rx_packets       += rxpackets;
 695                 stats->rx_bytes         += rxbytes;
 696                 stats->multicast        += rxmulticast;
 697                 stats->tx_packets       += txpackets;
 698                 stats->tx_bytes         += txbytes;
 699                 /* rx_errors & tx_dropped are u32 */
 700                 rx_errors       += p->rx_errors;
 701                 tx_dropped      += p->tx_dropped;
 702         }
 703         stats->rx_errors  = rx_errors;
 704         stats->tx_dropped = tx_dropped;
 705
 706         return stats;
 707 }
 708
 709 #ifdef CONFIG_NET_POLL_CONTROLLER
 710 static void vlan_dev_poll_controller(struct net_device *dev)
 711 {
 712         return;
 713 }
 714
 715 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 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_KERNEL);
 723         err = -ENOMEM;
 724         if (!netpoll)
 725                 goto out;
 726
 727         err = __netpoll_setup(netpoll, real_dev);
 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 int vlan_dev_get_iflink(const struct net_device *dev)
 754 {
 755         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 756
 757         return real_dev->ifindex;
 758 }
 759
 760 static const struct ethtool_ops vlan_ethtool_ops = {
 761         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 762         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 763         .get_link               = ethtool_op_get_link,
 764         .get_ts_info            = vlan_ethtool_get_ts_info,
 765 };
 766
 767 static const struct net_device_ops vlan_netdev_ops = {
 768         .ndo_change_mtu         = vlan_dev_change_mtu,
 769         .ndo_init               = vlan_dev_init,
 770         .ndo_uninit             = vlan_dev_uninit,
 771         .ndo_open               = vlan_dev_open,
 772         .ndo_stop               = vlan_dev_stop,
 773         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 774         .ndo_validate_addr      = eth_validate_addr,
 775         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 776         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 777         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 778         .ndo_do_ioctl           = vlan_dev_ioctl,
 779         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 780         .ndo_get_stats64        = vlan_dev_get_stats64,
 781 #if IS_ENABLED(CONFIG_FCOE)
 782         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 783         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 784         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 785         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 786         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 787         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 788 #endif
 789 #ifdef CONFIG_NET_POLL_CONTROLLER
 790         .ndo_poll_controller    = vlan_dev_poll_controller,
 791         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 792         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 793 #endif
 794         .ndo_fix_features       = vlan_dev_fix_features,
 795         .ndo_neigh_construct    = netdev_default_l2upper_neigh_construct,
 796         .ndo_neigh_destroy      = netdev_default_l2upper_neigh_destroy,
 797         .ndo_fdb_add            = switchdev_port_fdb_add,
 798         .ndo_fdb_del            = switchdev_port_fdb_del,
 799         .ndo_fdb_dump           = switchdev_port_fdb_dump,
 800         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
 801         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
 802         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
 803         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 804         .ndo_get_iflink         = vlan_dev_get_iflink,
 805 };
 806
 807 static void vlan_dev_free(struct net_device *dev)
 808 {
 809         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 810
 811         free_percpu(vlan->vlan_pcpu_stats);
 812         vlan->vlan_pcpu_stats = NULL;
 813         free_netdev(dev);
 814 }
 815
 816 void vlan_setup(struct net_device *dev)
 817 {
 818         ether_setup(dev);
 819
 820         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 821         dev->priv_flags         |= IFF_UNICAST_FLT;
 822         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 823         netif_keep_dst(dev);
 824
 825         dev->netdev_ops         = &vlan_netdev_ops;
 826         dev->destructor         = vlan_dev_free;
 827         dev->ethtool_ops        = &vlan_ethtool_ops;
 828
 829         eth_zero_addr(dev->broadcast);
 830 }