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 <linux/phy.h>
  33 #include <net/arp.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         /* TODO: gotta make sure the underlying layer can handle it,
 150          * maybe an IFF_VLAN_CAPABLE flag for devices?
 151          */
 152         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 153                 return -ERANGE;
 154
 155         dev->mtu = new_mtu;
 156
 157         return 0;
 158 }
 159
 160 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 161                                    u32 skb_prio, u16 vlan_prio)
 162 {
 163         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 164
 165         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 166                 vlan->nr_ingress_mappings--;
 167         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 168                 vlan->nr_ingress_mappings++;
 169
 170         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 171 }
 172
 173 int vlan_dev_set_egress_priority(const struct net_device *dev,
 174                                  u32 skb_prio, u16 vlan_prio)
 175 {
 176         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 177         struct vlan_priority_tci_mapping *mp = NULL;
 178         struct vlan_priority_tci_mapping *np;
 179         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 180
 181         /* See if a priority mapping exists.. */
 182         mp = vlan->egress_priority_map[skb_prio & 0xF];
 183         while (mp) {
 184                 if (mp->priority == skb_prio) {
 185                         if (mp->vlan_qos && !vlan_qos)
 186                                 vlan->nr_egress_mappings--;
 187                         else if (!mp->vlan_qos && vlan_qos)
 188                                 vlan->nr_egress_mappings++;
 189                         mp->vlan_qos = vlan_qos;
 190                         return 0;
 191                 }
 192                 mp = mp->next;
 193         }
 194
 195         /* Create a new mapping then. */
 196         mp = vlan->egress_priority_map[skb_prio & 0xF];
 197         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 198         if (!np)
 199                 return -ENOBUFS;
 200
 201         np->next = mp;
 202         np->priority = skb_prio;
 203         np->vlan_qos = vlan_qos;
 204         /* Before inserting this element in hash table, make sure all its fields
 205          * are committed to memory.
 206          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 207          */
 208         smp_wmb();
 209         vlan->egress_priority_map[skb_prio & 0xF] = np;
 210         if (vlan_qos)
 211                 vlan->nr_egress_mappings++;
 212         return 0;
 213 }
 214
 215 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 216 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 217 {
 218         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 219         u32 old_flags = vlan->flags;
 220
 221         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 222                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 223                 return -EINVAL;
 224
 225         vlan->flags = (old_flags & ~mask) | (flags & mask);
 226
 227         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 228                 if (vlan->flags & VLAN_FLAG_GVRP)
 229                         vlan_gvrp_request_join(dev);
 230                 else
 231                         vlan_gvrp_request_leave(dev);
 232         }
 233
 234         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 235                 if (vlan->flags & VLAN_FLAG_MVRP)
 236                         vlan_mvrp_request_join(dev);
 237                 else
 238                         vlan_mvrp_request_leave(dev);
 239         }
 240         return 0;
 241 }
 242
 243 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 244 {
 245         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 246 }
 247
 248 bool vlan_dev_inherit_address(struct net_device *dev,
 249                               struct net_device *real_dev)
 250 {
 251         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 252                 return false;
 253
 254         ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 255         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 256         return true;
 257 }
 258
 259 static int vlan_dev_open(struct net_device *dev)
 260 {
 261         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 262         struct net_device *real_dev = vlan->real_dev;
 263         int err;
 264
 265         if (!(real_dev->flags & IFF_UP) &&
 266             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 267                 return -ENETDOWN;
 268
 269         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 270             !vlan_dev_inherit_address(dev, real_dev)) {
 271                 err = dev_uc_add(real_dev, dev->dev_addr);
 272                 if (err < 0)
 273                         goto out;
 274         }
 275
 276         if (dev->flags & IFF_ALLMULTI) {
 277                 err = dev_set_allmulti(real_dev, 1);
 278                 if (err < 0)
 279                         goto del_unicast;
 280         }
 281         if (dev->flags & IFF_PROMISC) {
 282                 err = dev_set_promiscuity(real_dev, 1);
 283                 if (err < 0)
 284                         goto clear_allmulti;
 285         }
 286
 287         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 288
 289         if (vlan->flags & VLAN_FLAG_GVRP)
 290                 vlan_gvrp_request_join(dev);
 291
 292         if (vlan->flags & VLAN_FLAG_MVRP)
 293                 vlan_mvrp_request_join(dev);
 294
 295         if (netif_carrier_ok(real_dev))
 296                 netif_carrier_on(dev);
 297         return 0;
 298
 299 clear_allmulti:
 300         if (dev->flags & IFF_ALLMULTI)
 301                 dev_set_allmulti(real_dev, -1);
 302 del_unicast:
 303         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 304                 dev_uc_del(real_dev, dev->dev_addr);
 305 out:
 306         netif_carrier_off(dev);
 307         return err;
 308 }
 309
 310 static int vlan_dev_stop(struct net_device *dev)
 311 {
 312         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 313         struct net_device *real_dev = vlan->real_dev;
 314
 315         dev_mc_unsync(real_dev, dev);
 316         dev_uc_unsync(real_dev, dev);
 317         if (dev->flags & IFF_ALLMULTI)
 318                 dev_set_allmulti(real_dev, -1);
 319         if (dev->flags & IFF_PROMISC)
 320                 dev_set_promiscuity(real_dev, -1);
 321
 322         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 323                 dev_uc_del(real_dev, dev->dev_addr);
 324
 325         netif_carrier_off(dev);
 326         return 0;
 327 }
 328
 329 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 330 {
 331         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 332         struct sockaddr *addr = p;
 333         int err;
 334
 335         if (!is_valid_ether_addr(addr->sa_data))
 336                 return -EADDRNOTAVAIL;
 337
 338         if (!(dev->flags & IFF_UP))
 339                 goto out;
 340
 341         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 342                 err = dev_uc_add(real_dev, addr->sa_data);
 343                 if (err < 0)
 344                         return err;
 345         }
 346
 347         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 348                 dev_uc_del(real_dev, dev->dev_addr);
 349
 350 out:
 351         ether_addr_copy(dev->dev_addr, addr->sa_data);
 352         return 0;
 353 }
 354
 355 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 356 {
 357         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 358         const struct net_device_ops *ops = real_dev->netdev_ops;
 359         struct ifreq ifrr;
 360         int err = -EOPNOTSUPP;
 361
 362         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 363         ifrr.ifr_ifru = ifr->ifr_ifru;
 364
 365         switch (cmd) {
 366         case SIOCSHWTSTAMP:
 367                 if (!net_eq(dev_net(dev), &init_net))
 368                         break;
 369         case SIOCGMIIPHY:
 370         case SIOCGMIIREG:
 371         case SIOCSMIIREG:
 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_ALL_CSUM | NETIF_F_SG |
 561                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 562                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 563                            NETIF_F_ALL_FCOE;
 564
 565         dev->features |= dev->hw_features | NETIF_F_LLTX;
 566         dev->gso_max_size = real_dev->gso_max_size;
 567         if (dev->features & NETIF_F_VLAN_FEATURES)
 568                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 569
 570         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 571
 572         /* ipv6 shared card related stuff */
 573         dev->dev_id = real_dev->dev_id;
 574
 575         if (is_zero_ether_addr(dev->dev_addr)) {
 576                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 577                 dev->addr_assign_type = NET_ADDR_STOLEN;
 578         }
 579         if (is_zero_ether_addr(dev->broadcast))
 580                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 581
 582 #if IS_ENABLED(CONFIG_FCOE)
 583         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 584 #endif
 585
 586         dev->needed_headroom = real_dev->needed_headroom;
 587         if (vlan_hw_offload_capable(real_dev->features,
 588                                     vlan_dev_priv(dev)->vlan_proto)) {
 589                 dev->header_ops      = &vlan_passthru_header_ops;
 590                 dev->hard_header_len = real_dev->hard_header_len;
 591         } else {
 592                 dev->header_ops      = &vlan_header_ops;
 593                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 594         }
 595
 596         dev->netdev_ops = &vlan_netdev_ops;
 597
 598         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 599
 600         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 601
 602         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 603         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 604                 return -ENOMEM;
 605
 606         return 0;
 607 }
 608
 609 /* Note: this function might be called multiple times for the same device. */
 610 void vlan_dev_uninit(struct net_device *dev)
 611 {
 612         struct vlan_priority_tci_mapping *pm;
 613         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 614         int i;
 615
 616         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 617                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 618                         vlan->egress_priority_map[i] = pm->next;
 619                         kfree(pm);
 620                 }
 621         }
 622 }
 623
 624 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 625         netdev_features_t features)
 626 {
 627         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 628         netdev_features_t old_features = features;
 629
 630         features = netdev_intersect_features(features, real_dev->vlan_features);
 631         features |= NETIF_F_RXCSUM;
 632         features = netdev_intersect_features(features, real_dev->features);
 633
 634         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 635         features |= NETIF_F_LLTX;
 636
 637         return features;
 638 }
 639
 640 static int vlan_ethtool_get_settings(struct net_device *dev,
 641                                      struct ethtool_cmd *cmd)
 642 {
 643         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 644
 645         return __ethtool_get_settings(vlan->real_dev, cmd);
 646 }
 647
 648 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 649                                      struct ethtool_drvinfo *info)
 650 {
 651         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 652         strlcpy(info->version, vlan_version, sizeof(info->version));
 653         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 654 }
 655
 656 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 657                                     struct ethtool_ts_info *info)
 658 {
 659         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 660         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 661         struct phy_device *phydev = vlan->real_dev->phydev;
 662
 663         if (phydev && phydev->drv && phydev->drv->ts_info) {
 664                  return phydev->drv->ts_info(phydev, info);
 665         } else if (ops->get_ts_info) {
 666                 return ops->get_ts_info(vlan->real_dev, info);
 667         } else {
 668                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 669                         SOF_TIMESTAMPING_SOFTWARE;
 670                 info->phc_index = -1;
 671         }
 672
 673         return 0;
 674 }
 675
 676 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 677 {
 678         struct vlan_pcpu_stats *p;
 679         u32 rx_errors = 0, tx_dropped = 0;
 680         int i;
 681
 682         for_each_possible_cpu(i) {
 683                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 684                 unsigned int start;
 685
 686                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 687                 do {
 688                         start = u64_stats_fetch_begin_irq(&p->syncp);
 689                         rxpackets       = p->rx_packets;
 690                         rxbytes         = p->rx_bytes;
 691                         rxmulticast     = p->rx_multicast;
 692                         txpackets       = p->tx_packets;
 693                         txbytes         = p->tx_bytes;
 694                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 695
 696                 stats->rx_packets       += rxpackets;
 697                 stats->rx_bytes         += rxbytes;
 698                 stats->multicast        += rxmulticast;
 699                 stats->tx_packets       += txpackets;
 700                 stats->tx_bytes         += txbytes;
 701                 /* rx_errors & tx_dropped are u32 */
 702                 rx_errors       += p->rx_errors;
 703                 tx_dropped      += p->tx_dropped;
 704         }
 705         stats->rx_errors  = rx_errors;
 706         stats->tx_dropped = tx_dropped;
 707
 708         return stats;
 709 }
 710
 711 #ifdef CONFIG_NET_POLL_CONTROLLER
 712 static void vlan_dev_poll_controller(struct net_device *dev)
 713 {
 714         return;
 715 }
 716
 717 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 718 {
 719         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 720         struct net_device *real_dev = vlan->real_dev;
 721         struct netpoll *netpoll;
 722         int err = 0;
 723
 724         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 725         err = -ENOMEM;
 726         if (!netpoll)
 727                 goto out;
 728
 729         err = __netpoll_setup(netpoll, real_dev);
 730         if (err) {
 731                 kfree(netpoll);
 732                 goto out;
 733         }
 734
 735         vlan->netpoll = netpoll;
 736
 737 out:
 738         return err;
 739 }
 740
 741 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 742 {
 743         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 744         struct netpoll *netpoll = vlan->netpoll;
 745
 746         if (!netpoll)
 747                 return;
 748
 749         vlan->netpoll = NULL;
 750
 751         __netpoll_free_async(netpoll);
 752 }
 753 #endif /* CONFIG_NET_POLL_CONTROLLER */
 754
 755 static int vlan_dev_get_iflink(const struct net_device *dev)
 756 {
 757         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 758
 759         return real_dev->ifindex;
 760 }
 761
 762 static const struct ethtool_ops vlan_ethtool_ops = {
 763         .get_settings           = vlan_ethtool_get_settings,
 764         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 765         .get_link               = ethtool_op_get_link,
 766         .get_ts_info            = vlan_ethtool_get_ts_info,
 767 };
 768
 769 static const struct net_device_ops vlan_netdev_ops = {
 770         .ndo_change_mtu         = vlan_dev_change_mtu,
 771         .ndo_init               = vlan_dev_init,
 772         .ndo_uninit             = vlan_dev_uninit,
 773         .ndo_open               = vlan_dev_open,
 774         .ndo_stop               = vlan_dev_stop,
 775         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 776         .ndo_validate_addr      = eth_validate_addr,
 777         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 778         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 779         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 780         .ndo_do_ioctl           = vlan_dev_ioctl,
 781         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 782         .ndo_get_stats64        = vlan_dev_get_stats64,
 783 #if IS_ENABLED(CONFIG_FCOE)
 784         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 785         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 786         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 787         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 788         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 789         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 790 #endif
 791 #ifdef CONFIG_NET_POLL_CONTROLLER
 792         .ndo_poll_controller    = vlan_dev_poll_controller,
 793         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 794         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 795 #endif
 796         .ndo_fix_features       = vlan_dev_fix_features,
 797         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 798         .ndo_get_iflink         = vlan_dev_get_iflink,
 799 };
 800
 801 static void vlan_dev_free(struct net_device *dev)
 802 {
 803         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 804
 805         free_percpu(vlan->vlan_pcpu_stats);
 806         vlan->vlan_pcpu_stats = NULL;
 807         free_netdev(dev);
 808 }
 809
 810 void vlan_setup(struct net_device *dev)
 811 {
 812         ether_setup(dev);
 813
 814         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 815         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 816         netif_keep_dst(dev);
 817
 818         dev->netdev_ops         = &vlan_netdev_ops;
 819         dev->destructor         = vlan_dev_free;
 820         dev->ethtool_ops        = &vlan_ethtool_ops;
 821
 822         eth_zero_addr(dev->broadcast);
 823 }