kernel/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
  34 #include "vlan.h"
  35 #include "vlanproc.h"
  36 #include <linux/if_vlan.h>
  37 #include <linux/netpoll.h>
  38
  39 /*
  40  *      Create the VLAN header for an arbitrary protocol layer
  41  *
  42  *      saddr=NULL      means use device source address
  43  *      daddr=NULL      means leave destination address (eg unresolved arp)
  44  *
  45  *  This is called when the SKB is moving down the stack towards the
  46  *  physical devices.
  47  */
  48 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  49                                 unsigned short type,
  50                                 const void *daddr, const void *saddr,
  51                                 unsigned int len)
  52 {
  53         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  54         struct vlan_hdr *vhdr;
  55         unsigned int vhdrlen = 0;
  56         u16 vlan_tci = 0;
  57         int rc;
  58
  59         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  60                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
  61
  62                 vlan_tci = vlan->vlan_id;
  63                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  64                 vhdr->h_vlan_TCI = htons(vlan_tci);
  65
  66                 /*
  67                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  68                  *  put the length in here instead.
  69                  */
  70                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  71                         vhdr->h_vlan_encapsulated_proto = htons(type);
  72                 else
  73                         vhdr->h_vlan_encapsulated_proto = htons(len);
  74
  75                 skb->protocol = vlan->vlan_proto;
  76                 type = ntohs(vlan->vlan_proto);
  77                 vhdrlen = VLAN_HLEN;
  78         }
  79
  80         /* Before delegating work to the lower layer, enter our MAC-address */
  81         if (saddr == NULL)
  82                 saddr = dev->dev_addr;
  83
  84         /* Now make the underlying real hard header */
  85         dev = vlan->real_dev;
  86         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  87         if (rc > 0)
  88                 rc += vhdrlen;
  89         return rc;
  90 }
  91
  92 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  93 {
  94 #ifdef CONFIG_NET_POLL_CONTROLLER
  95         if (vlan->netpoll)
  96                 netpoll_send_skb(vlan->netpoll, skb);
  97 #else
  98         BUG();
  99 #endif
 100         return NETDEV_TX_OK;
 101 }
 102
 103 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 104                                             struct net_device *dev)
 105 {
 106         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 107         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 108         unsigned int len;
 109         int ret;
 110
 111         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 112          *
 113          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 114          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 115          */
 116         if (veth->h_vlan_proto != vlan->vlan_proto ||
 117             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 118                 u16 vlan_tci;
 119                 vlan_tci = vlan->vlan_id;
 120                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 121                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 122         }
 123
 124         skb->dev = vlan->real_dev;
 125         len = skb->len;
 126         if (unlikely(netpoll_tx_running(dev)))
 127                 return vlan_netpoll_send_skb(vlan, skb);
 128
 129         ret = dev_queue_xmit(skb);
 130
 131         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 132                 struct vlan_pcpu_stats *stats;
 133
 134                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 135                 u64_stats_update_begin(&stats->syncp);
 136                 stats->tx_packets++;
 137                 stats->tx_bytes += len;
 138                 u64_stats_update_end(&stats->syncp);
 139         } else {
 140                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 141         }
 142
 143         return ret;
 144 }
 145
 146 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 147 {
 148         /* TODO: gotta make sure the underlying layer can handle it,
 149          * maybe an IFF_VLAN_CAPABLE flag for devices?
 150          */
 151         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 152                 return -ERANGE;
 153
 154         dev->mtu = new_mtu;
 155
 156         return 0;
 157 }
 158
 159 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 160                                    u32 skb_prio, u16 vlan_prio)
 161 {
 162         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 163
 164         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 165                 vlan->nr_ingress_mappings--;
 166         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 167                 vlan->nr_ingress_mappings++;
 168
 169         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 170 }
 171
 172 int vlan_dev_set_egress_priority(const struct net_device *dev,
 173                                  u32 skb_prio, u16 vlan_prio)
 174 {
 175         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 176         struct vlan_priority_tci_mapping *mp = NULL;
 177         struct vlan_priority_tci_mapping *np;
 178         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 179
 180         /* See if a priority mapping exists.. */
 181         mp = vlan->egress_priority_map[skb_prio & 0xF];
 182         while (mp) {
 183                 if (mp->priority == skb_prio) {
 184                         if (mp->vlan_qos && !vlan_qos)
 185                                 vlan->nr_egress_mappings--;
 186                         else if (!mp->vlan_qos && vlan_qos)
 187                                 vlan->nr_egress_mappings++;
 188                         mp->vlan_qos = vlan_qos;
 189                         return 0;
 190                 }
 191                 mp = mp->next;
 192         }
 193
 194         /* Create a new mapping then. */
 195         mp = vlan->egress_priority_map[skb_prio & 0xF];
 196         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 197         if (!np)
 198                 return -ENOBUFS;
 199
 200         np->next = mp;
 201         np->priority = skb_prio;
 202         np->vlan_qos = vlan_qos;
 203         /* Before inserting this element in hash table, make sure all its fields
 204          * are committed to memory.
 205          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 206          */
 207         smp_wmb();
 208         vlan->egress_priority_map[skb_prio & 0xF] = np;
 209         if (vlan_qos)
 210                 vlan->nr_egress_mappings++;
 211         return 0;
 212 }
 213
 214 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 215 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 216 {
 217         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 218         u32 old_flags = vlan->flags;
 219
 220         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 221                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 222                 return -EINVAL;
 223
 224         vlan->flags = (old_flags & ~mask) | (flags & mask);
 225
 226         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 227                 if (vlan->flags & VLAN_FLAG_GVRP)
 228                         vlan_gvrp_request_join(dev);
 229                 else
 230                         vlan_gvrp_request_leave(dev);
 231         }
 232
 233         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 234                 if (vlan->flags & VLAN_FLAG_MVRP)
 235                         vlan_mvrp_request_join(dev);
 236                 else
 237                         vlan_mvrp_request_leave(dev);
 238         }
 239         return 0;
 240 }
 241
 242 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 243 {
 244         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 245 }
 246
 247 static int vlan_dev_open(struct net_device *dev)
 248 {
 249         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 250         struct net_device *real_dev = vlan->real_dev;
 251         int err;
 252
 253         if (!(real_dev->flags & IFF_UP) &&
 254             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 255                 return -ENETDOWN;
 256
 257         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 258                 err = dev_uc_add(real_dev, dev->dev_addr);
 259                 if (err < 0)
 260                         goto out;
 261         }
 262
 263         if (dev->flags & IFF_ALLMULTI) {
 264                 err = dev_set_allmulti(real_dev, 1);
 265                 if (err < 0)
 266                         goto del_unicast;
 267         }
 268         if (dev->flags & IFF_PROMISC) {
 269                 err = dev_set_promiscuity(real_dev, 1);
 270                 if (err < 0)
 271                         goto clear_allmulti;
 272         }
 273
 274         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 275
 276         if (vlan->flags & VLAN_FLAG_GVRP)
 277                 vlan_gvrp_request_join(dev);
 278
 279         if (vlan->flags & VLAN_FLAG_MVRP)
 280                 vlan_mvrp_request_join(dev);
 281
 282         if (netif_carrier_ok(real_dev))
 283                 netif_carrier_on(dev);
 284         return 0;
 285
 286 clear_allmulti:
 287         if (dev->flags & IFF_ALLMULTI)
 288                 dev_set_allmulti(real_dev, -1);
 289 del_unicast:
 290         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 291                 dev_uc_del(real_dev, dev->dev_addr);
 292 out:
 293         netif_carrier_off(dev);
 294         return err;
 295 }
 296
 297 static int vlan_dev_stop(struct net_device *dev)
 298 {
 299         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 300         struct net_device *real_dev = vlan->real_dev;
 301
 302         dev_mc_unsync(real_dev, dev);
 303         dev_uc_unsync(real_dev, dev);
 304         if (dev->flags & IFF_ALLMULTI)
 305                 dev_set_allmulti(real_dev, -1);
 306         if (dev->flags & IFF_PROMISC)
 307                 dev_set_promiscuity(real_dev, -1);
 308
 309         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 310                 dev_uc_del(real_dev, dev->dev_addr);
 311
 312         netif_carrier_off(dev);
 313         return 0;
 314 }
 315
 316 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 317 {
 318         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 319         struct sockaddr *addr = p;
 320         int err;
 321
 322         if (!is_valid_ether_addr(addr->sa_data))
 323                 return -EADDRNOTAVAIL;
 324
 325         if (!(dev->flags & IFF_UP))
 326                 goto out;
 327
 328         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 329                 err = dev_uc_add(real_dev, addr->sa_data);
 330                 if (err < 0)
 331                         return err;
 332         }
 333
 334         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 335                 dev_uc_del(real_dev, dev->dev_addr);
 336
 337 out:
 338         ether_addr_copy(dev->dev_addr, addr->sa_data);
 339         return 0;
 340 }
 341
 342 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 343 {
 344         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 345         const struct net_device_ops *ops = real_dev->netdev_ops;
 346         struct ifreq ifrr;
 347         int err = -EOPNOTSUPP;
 348
 349         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 350         ifrr.ifr_ifru = ifr->ifr_ifru;
 351
 352         switch (cmd) {
 353         case SIOCGMIIPHY:
 354         case SIOCGMIIREG:
 355         case SIOCSMIIREG:
 356         case SIOCSHWTSTAMP:
 357         case SIOCGHWTSTAMP:
 358                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 359                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 360                 break;
 361         }
 362
 363         if (!err)
 364                 ifr->ifr_ifru = ifrr.ifr_ifru;
 365
 366         return err;
 367 }
 368
 369 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 370 {
 371         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 372         const struct net_device_ops *ops = real_dev->netdev_ops;
 373         int err = 0;
 374
 375         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 376                 err = ops->ndo_neigh_setup(real_dev, pa);
 377
 378         return err;
 379 }
 380
 381 #if IS_ENABLED(CONFIG_FCOE)
 382 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 383                                    struct scatterlist *sgl, unsigned int sgc)
 384 {
 385         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 386         const struct net_device_ops *ops = real_dev->netdev_ops;
 387         int rc = 0;
 388
 389         if (ops->ndo_fcoe_ddp_setup)
 390                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 391
 392         return rc;
 393 }
 394
 395 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 396 {
 397         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 398         const struct net_device_ops *ops = real_dev->netdev_ops;
 399         int len = 0;
 400
 401         if (ops->ndo_fcoe_ddp_done)
 402                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 403
 404         return len;
 405 }
 406
 407 static int vlan_dev_fcoe_enable(struct net_device *dev)
 408 {
 409         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 410         const struct net_device_ops *ops = real_dev->netdev_ops;
 411         int rc = -EINVAL;
 412
 413         if (ops->ndo_fcoe_enable)
 414                 rc = ops->ndo_fcoe_enable(real_dev);
 415         return rc;
 416 }
 417
 418 static int vlan_dev_fcoe_disable(struct net_device *dev)
 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 rc = -EINVAL;
 423
 424         if (ops->ndo_fcoe_disable)
 425                 rc = ops->ndo_fcoe_disable(real_dev);
 426         return rc;
 427 }
 428
 429 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 430 {
 431         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 432         const struct net_device_ops *ops = real_dev->netdev_ops;
 433         int rc = -EINVAL;
 434
 435         if (ops->ndo_fcoe_get_wwn)
 436                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 437         return rc;
 438 }
 439
 440 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 441                                     struct scatterlist *sgl, unsigned int sgc)
 442 {
 443         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 444         const struct net_device_ops *ops = real_dev->netdev_ops;
 445         int rc = 0;
 446
 447         if (ops->ndo_fcoe_ddp_target)
 448                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 449
 450         return rc;
 451 }
 452 #endif
 453
 454 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 455 {
 456         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 457
 458         if (dev->flags & IFF_UP) {
 459                 if (change & IFF_ALLMULTI)
 460                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 461                 if (change & IFF_PROMISC)
 462                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 463         }
 464 }
 465
 466 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 467 {
 468         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 469         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 470 }
 471
 472 /*
 473  * vlan network devices have devices nesting below it, and are a special
 474  * "super class" of normal network devices; split their locks off into a
 475  * separate class since they always nest.
 476  */
 477 static struct lock_class_key vlan_netdev_xmit_lock_key;
 478 static struct lock_class_key vlan_netdev_addr_lock_key;
 479
 480 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 481                                      struct netdev_queue *txq,
 482                                      void *_subclass)
 483 {
 484         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 485                                        &vlan_netdev_xmit_lock_key,
 486                                        *(int *)_subclass);
 487 }
 488
 489 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 490 {
 491         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 492                                        &vlan_netdev_addr_lock_key,
 493                                        subclass);
 494         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 495 }
 496
 497 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 498 {
 499         return vlan_dev_priv(dev)->nest_level;
 500 }
 501
 502 static const struct header_ops vlan_header_ops = {
 503         .create  = vlan_dev_hard_header,
 504         .parse   = eth_header_parse,
 505 };
 506
 507 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 508                                      unsigned short type,
 509                                      const void *daddr, const void *saddr,
 510                                      unsigned int len)
 511 {
 512         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 513         struct net_device *real_dev = vlan->real_dev;
 514
 515         if (saddr == NULL)
 516                 saddr = dev->dev_addr;
 517
 518         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 519 }
 520
 521 static const struct header_ops vlan_passthru_header_ops = {
 522         .create  = vlan_passthru_hard_header,
 523         .parse   = eth_header_parse,
 524 };
 525
 526 static struct device_type vlan_type = {
 527         .name   = "vlan",
 528 };
 529
 530 static const struct net_device_ops vlan_netdev_ops;
 531
 532 static int vlan_dev_init(struct net_device *dev)
 533 {
 534         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 535
 536         netif_carrier_off(dev);
 537
 538         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 539         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 540                                           IFF_MASTER | IFF_SLAVE);
 541         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 542                                           (1<<__LINK_STATE_DORMANT))) |
 543                       (1<<__LINK_STATE_PRESENT);
 544
 545         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 546                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 547                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 548                            NETIF_F_ALL_FCOE;
 549
 550         dev->features |= real_dev->vlan_features | NETIF_F_LLTX |
 551                          NETIF_F_GSO_SOFTWARE;
 552         dev->gso_max_size = real_dev->gso_max_size;
 553         if (dev->features & NETIF_F_VLAN_FEATURES)
 554                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 555
 556         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 557
 558         /* ipv6 shared card related stuff */
 559         dev->dev_id = real_dev->dev_id;
 560
 561         if (is_zero_ether_addr(dev->dev_addr))
 562                 eth_hw_addr_inherit(dev, real_dev);
 563         if (is_zero_ether_addr(dev->broadcast))
 564                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 565
 566 #if IS_ENABLED(CONFIG_FCOE)
 567         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 568 #endif
 569
 570         dev->needed_headroom = real_dev->needed_headroom;
 571         if (vlan_hw_offload_capable(real_dev->features,
 572                                     vlan_dev_priv(dev)->vlan_proto)) {
 573                 dev->header_ops      = &vlan_passthru_header_ops;
 574                 dev->hard_header_len = real_dev->hard_header_len;
 575         } else {
 576                 dev->header_ops      = &vlan_header_ops;
 577                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 578         }
 579
 580         dev->netdev_ops = &vlan_netdev_ops;
 581
 582         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 583
 584         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 585
 586         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 587         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 588                 return -ENOMEM;
 589
 590         return 0;
 591 }
 592
 593 static void vlan_dev_uninit(struct net_device *dev)
 594 {
 595         struct vlan_priority_tci_mapping *pm;
 596         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 597         int i;
 598
 599         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 600                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 601                         vlan->egress_priority_map[i] = pm->next;
 602                         kfree(pm);
 603                 }
 604         }
 605 }
 606
 607 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 608         netdev_features_t features)
 609 {
 610         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 611         netdev_features_t old_features = features;
 612
 613         features = netdev_intersect_features(features, real_dev->vlan_features);
 614         features |= NETIF_F_RXCSUM;
 615         features = netdev_intersect_features(features, real_dev->features);
 616
 617         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 618         features |= NETIF_F_LLTX;
 619
 620         return features;
 621 }
 622
 623 static int vlan_ethtool_get_settings(struct net_device *dev,
 624                                      struct ethtool_cmd *cmd)
 625 {
 626         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 627
 628         return __ethtool_get_settings(vlan->real_dev, cmd);
 629 }
 630
 631 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 632                                      struct ethtool_drvinfo *info)
 633 {
 634         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 635         strlcpy(info->version, vlan_version, sizeof(info->version));
 636         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 637 }
 638
 639 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 640                                     struct ethtool_ts_info *info)
 641 {
 642         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 643         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 644
 645         if (ops->get_ts_info) {
 646                 return ops->get_ts_info(vlan->real_dev, info);
 647         } else {
 648                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 649                         SOF_TIMESTAMPING_SOFTWARE;
 650                 info->phc_index = -1;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 657 {
 658         struct vlan_pcpu_stats *p;
 659         u32 rx_errors = 0, tx_dropped = 0;
 660         int i;
 661
 662         for_each_possible_cpu(i) {
 663                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 664                 unsigned int start;
 665
 666                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 667                 do {
 668                         start = u64_stats_fetch_begin_irq(&p->syncp);
 669                         rxpackets       = p->rx_packets;
 670                         rxbytes         = p->rx_bytes;
 671                         rxmulticast     = p->rx_multicast;
 672                         txpackets       = p->tx_packets;
 673                         txbytes         = p->tx_bytes;
 674                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 675
 676                 stats->rx_packets       += rxpackets;
 677                 stats->rx_bytes         += rxbytes;
 678                 stats->multicast        += rxmulticast;
 679                 stats->tx_packets       += txpackets;
 680                 stats->tx_bytes         += txbytes;
 681                 /* rx_errors & tx_dropped are u32 */
 682                 rx_errors       += p->rx_errors;
 683                 tx_dropped      += p->tx_dropped;
 684         }
 685         stats->rx_errors  = rx_errors;
 686         stats->tx_dropped = tx_dropped;
 687
 688         return stats;
 689 }
 690
 691 #ifdef CONFIG_NET_POLL_CONTROLLER
 692 static void vlan_dev_poll_controller(struct net_device *dev)
 693 {
 694         return;
 695 }
 696
 697 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 698 {
 699         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 700         struct net_device *real_dev = vlan->real_dev;
 701         struct netpoll *netpoll;
 702         int err = 0;
 703
 704         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 705         err = -ENOMEM;
 706         if (!netpoll)
 707                 goto out;
 708
 709         err = __netpoll_setup(netpoll, real_dev);
 710         if (err) {
 711                 kfree(netpoll);
 712                 goto out;
 713         }
 714
 715         vlan->netpoll = netpoll;
 716
 717 out:
 718         return err;
 719 }
 720
 721 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 722 {
 723         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 724         struct netpoll *netpoll = vlan->netpoll;
 725
 726         if (!netpoll)
 727                 return;
 728
 729         vlan->netpoll = NULL;
 730
 731         __netpoll_free_async(netpoll);
 732 }
 733 #endif /* CONFIG_NET_POLL_CONTROLLER */
 734
 735 static int vlan_dev_get_iflink(const struct net_device *dev)
 736 {
 737         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 738
 739         return real_dev->ifindex;
 740 }
 741
 742 static const struct ethtool_ops vlan_ethtool_ops = {
 743         .get_settings           = vlan_ethtool_get_settings,
 744         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 745         .get_link               = ethtool_op_get_link,
 746         .get_ts_info            = vlan_ethtool_get_ts_info,
 747 };
 748
 749 static const struct net_device_ops vlan_netdev_ops = {
 750         .ndo_change_mtu         = vlan_dev_change_mtu,
 751         .ndo_init               = vlan_dev_init,
 752         .ndo_uninit             = vlan_dev_uninit,
 753         .ndo_open               = vlan_dev_open,
 754         .ndo_stop               = vlan_dev_stop,
 755         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 756         .ndo_validate_addr      = eth_validate_addr,
 757         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 758         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 759         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 760         .ndo_do_ioctl           = vlan_dev_ioctl,
 761         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 762         .ndo_get_stats64        = vlan_dev_get_stats64,
 763 #if IS_ENABLED(CONFIG_FCOE)
 764         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 765         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 766         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 767         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 768         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 769         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 770 #endif
 771 #ifdef CONFIG_NET_POLL_CONTROLLER
 772         .ndo_poll_controller    = vlan_dev_poll_controller,
 773         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 774         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 775 #endif
 776         .ndo_fix_features       = vlan_dev_fix_features,
 777         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 778         .ndo_get_iflink         = vlan_dev_get_iflink,
 779 };
 780
 781 static void vlan_dev_free(struct net_device *dev)
 782 {
 783         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 784
 785         free_percpu(vlan->vlan_pcpu_stats);
 786         vlan->vlan_pcpu_stats = NULL;
 787         free_netdev(dev);
 788 }
 789
 790 void vlan_setup(struct net_device *dev)
 791 {
 792         ether_setup(dev);
 793
 794         dev->priv_flags         |= IFF_802_1Q_VLAN;
 795         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 796         netif_keep_dst(dev);
 797         dev->tx_queue_len       = 0;
 798
 799         dev->netdev_ops         = &vlan_netdev_ops;
 800         dev->destructor         = vlan_dev_free;
 801         dev->ethtool_ops        = &vlan_ethtool_ops;
 802
 803         eth_zero_addr(dev->broadcast);
 804 }