net/8021q/vlan_dev.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* -*- linux-c -*-
   3  * INET         802.1Q VLAN
   4  *              Ethernet-type device handling.
   5  *
   6  * Authors:     Ben Greear <greearb@candelatech.com>
   7  *              Please send support related email to: netdev@vger.kernel.org
   8  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   9  *
  10  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
  11  *                - reset skb->pkt_type on incoming packets when MAC was changed
  12  *                - see that changed MAC is saddr for outgoing packets
  13  *              Oct 20, 2001:  Ard van Breeman:
  14  *                - Fix MC-list, finally.
  15  *                - Flush MC-list on VLAN destroy.
  16  */
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/net_tstamp.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/phy.h>
  28 #include <net/arp.h>
  29 #include <net/macsec.h>
  30 #include <net/netdev_lock.h>
  31
  32 #include "vlan.h"
  33 #include "vlanproc.h"
  34 #include <linux/if_vlan.h>
  35 #include <linux/netpoll.h>
  36
  37 /*
  38  *      Create the VLAN header for an arbitrary protocol layer
  39  *
  40  *      saddr=NULL      means use device source address
  41  *      daddr=NULL      means leave destination address (eg unresolved arp)
  42  *
  43  *  This is called when the SKB is moving down the stack towards the
  44  *  physical devices.
  45  */
  46 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  47                                 unsigned short type,
  48                                 const void *daddr, const void *saddr,
  49                                 unsigned int len)
  50 {
  51         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  52         struct vlan_hdr *vhdr;
  53         unsigned int vhdrlen = 0;
  54         u16 vlan_tci = 0;
  55         int rc;
  56
  57         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  58                 vhdr = skb_push(skb, VLAN_HLEN);
  59
  60                 vlan_tci = vlan->vlan_id;
  61                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  62                 vhdr->h_vlan_TCI = htons(vlan_tci);
  63
  64                 /*
  65                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  66                  *  put the length in here instead.
  67                  */
  68                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  69                         vhdr->h_vlan_encapsulated_proto = htons(type);
  70                 else
  71                         vhdr->h_vlan_encapsulated_proto = htons(len);
  72
  73                 skb->protocol = vlan->vlan_proto;
  74                 type = ntohs(vlan->vlan_proto);
  75                 vhdrlen = VLAN_HLEN;
  76         }
  77
  78         /* Before delegating work to the lower layer, enter our MAC-address */
  79         if (saddr == NULL)
  80                 saddr = dev->dev_addr;
  81
  82         /* Now make the underlying real hard header */
  83         dev = vlan->real_dev;
  84         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  85         if (rc > 0)
  86                 rc += vhdrlen;
  87         return rc;
  88 }
  89
  90 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  91 {
  92 #ifdef CONFIG_NET_POLL_CONTROLLER
  93         return netpoll_send_skb(vlan->netpoll, skb);
  94 #else
  95         BUG();
  96         return NETDEV_TX_OK;
  97 #endif
  98 }
  99
 100 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 101                                             struct net_device *dev)
 102 {
 103         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 104         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 105         unsigned int len;
 106         int ret;
 107
 108         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 109          *
 110          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 111          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 112          */
 113         if (vlan->flags & VLAN_FLAG_REORDER_HDR ||
 114             veth->h_vlan_proto != vlan->vlan_proto) {
 115                 u16 vlan_tci;
 116                 vlan_tci = vlan->vlan_id;
 117                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 118                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 119         }
 120
 121         skb->dev = vlan->real_dev;
 122         len = skb->len;
 123         if (unlikely(netpoll_tx_running(dev)))
 124                 return vlan_netpoll_send_skb(vlan, skb);
 125
 126         ret = dev_queue_xmit(skb);
 127
 128         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 129                 struct vlan_pcpu_stats *stats;
 130
 131                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 132                 u64_stats_update_begin(&stats->syncp);
 133                 u64_stats_inc(&stats->tx_packets);
 134                 u64_stats_add(&stats->tx_bytes, len);
 135                 u64_stats_update_end(&stats->syncp);
 136         } else {
 137                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 138         }
 139
 140         return ret;
 141 }
 142
 143 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 144 {
 145         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 146         unsigned int max_mtu = real_dev->mtu;
 147
 148         if (netif_reduces_vlan_mtu(real_dev))
 149                 max_mtu -= VLAN_HLEN;
 150         if (max_mtu < new_mtu)
 151                 return -ERANGE;
 152
 153         WRITE_ONCE(dev->mtu, new_mtu);
 154
 155         return 0;
 156 }
 157
 158 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 159                                    u32 skb_prio, u16 vlan_prio)
 160 {
 161         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 162
 163         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 164                 vlan->nr_ingress_mappings--;
 165         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 166                 vlan->nr_ingress_mappings++;
 167
 168         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 169 }
 170
 171 int vlan_dev_set_egress_priority(const struct net_device *dev,
 172                                  u32 skb_prio, u16 vlan_prio)
 173 {
 174         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 175         struct vlan_priority_tci_mapping *mp = NULL;
 176         struct vlan_priority_tci_mapping *np;
 177         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 178
 179         /* See if a priority mapping exists.. */
 180         mp = vlan->egress_priority_map[skb_prio & 0xF];
 181         while (mp) {
 182                 if (mp->priority == skb_prio) {
 183                         if (mp->vlan_qos && !vlan_qos)
 184                                 vlan->nr_egress_mappings--;
 185                         else if (!mp->vlan_qos && vlan_qos)
 186                                 vlan->nr_egress_mappings++;
 187                         mp->vlan_qos = vlan_qos;
 188                         return 0;
 189                 }
 190                 mp = mp->next;
 191         }
 192
 193         /* Create a new mapping then. */
 194         mp = vlan->egress_priority_map[skb_prio & 0xF];
 195         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 196         if (!np)
 197                 return -ENOBUFS;
 198
 199         np->next = mp;
 200         np->priority = skb_prio;
 201         np->vlan_qos = vlan_qos;
 202         /* Before inserting this element in hash table, make sure all its fields
 203          * are committed to memory.
 204          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 205          */
 206         smp_wmb();
 207         vlan->egress_priority_map[skb_prio & 0xF] = np;
 208         if (vlan_qos)
 209                 vlan->nr_egress_mappings++;
 210         return 0;
 211 }
 212
 213 /* Flags are defined in the vlan_flags enum in
 214  * include/uapi/linux/if_vlan.h file.
 215  */
 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                      VLAN_FLAG_BRIDGE_BINDING))
 224                 return -EINVAL;
 225
 226         vlan->flags = (old_flags & ~mask) | (flags & mask);
 227
 228         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 229                 if (vlan->flags & VLAN_FLAG_GVRP)
 230                         vlan_gvrp_request_join(dev);
 231                 else
 232                         vlan_gvrp_request_leave(dev);
 233         }
 234
 235         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 236                 if (vlan->flags & VLAN_FLAG_MVRP)
 237                         vlan_mvrp_request_join(dev);
 238                 else
 239                         vlan_mvrp_request_leave(dev);
 240         }
 241         return 0;
 242 }
 243
 244 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size)
 245 {
 246         strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size);
 247 }
 248
 249 bool vlan_dev_inherit_address(struct net_device *dev,
 250                               struct net_device *real_dev)
 251 {
 252         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 253                 return false;
 254
 255         eth_hw_addr_set(dev, real_dev->dev_addr);
 256         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 257         return true;
 258 }
 259
 260 static int vlan_dev_open(struct net_device *dev)
 261 {
 262         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 263         struct net_device *real_dev = vlan->real_dev;
 264         int err;
 265
 266         if (!(real_dev->flags & IFF_UP) &&
 267             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 268                 return -ENETDOWN;
 269
 270         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 271             !vlan_dev_inherit_address(dev, real_dev)) {
 272                 err = dev_uc_add(real_dev, dev->dev_addr);
 273                 if (err < 0)
 274                         goto out;
 275         }
 276
 277         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 278
 279         if (vlan->flags & VLAN_FLAG_GVRP)
 280                 vlan_gvrp_request_join(dev);
 281
 282         if (vlan->flags & VLAN_FLAG_MVRP)
 283                 vlan_mvrp_request_join(dev);
 284
 285         if (netif_carrier_ok(real_dev) &&
 286             !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 287                 netif_carrier_on(dev);
 288         return 0;
 289
 290 out:
 291         netif_carrier_off(dev);
 292         return err;
 293 }
 294
 295 static int vlan_dev_stop(struct net_device *dev)
 296 {
 297         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 298         struct net_device *real_dev = vlan->real_dev;
 299
 300         dev_mc_unsync(real_dev, dev);
 301         dev_uc_unsync(real_dev, dev);
 302
 303         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 304                 dev_uc_del(real_dev, dev->dev_addr);
 305
 306         if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 307                 netif_carrier_off(dev);
 308         return 0;
 309 }
 310
 311 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 312 {
 313         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 314         struct sockaddr *addr = p;
 315         int err;
 316
 317         if (!is_valid_ether_addr(addr->sa_data))
 318                 return -EADDRNOTAVAIL;
 319
 320         if (!(dev->flags & IFF_UP))
 321                 goto out;
 322
 323         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 324                 err = dev_uc_add(real_dev, addr->sa_data);
 325                 if (err < 0)
 326                         return err;
 327         }
 328
 329         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 330                 dev_uc_del(real_dev, dev->dev_addr);
 331
 332 out:
 333         eth_hw_addr_set(dev, addr->sa_data);
 334         return 0;
 335 }
 336
 337 static int vlan_hwtstamp_get(struct net_device *dev,
 338                              struct kernel_hwtstamp_config *cfg)
 339 {
 340         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 341
 342         return generic_hwtstamp_get_lower(real_dev, cfg);
 343 }
 344
 345 static int vlan_hwtstamp_set(struct net_device *dev,
 346                              struct kernel_hwtstamp_config *cfg,
 347                              struct netlink_ext_ack *extack)
 348 {
 349         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 350
 351         if (!net_eq(dev_net(dev), dev_net(real_dev)))
 352                 return -EOPNOTSUPP;
 353
 354         return generic_hwtstamp_set_lower(real_dev, cfg, extack);
 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         struct ifreq ifrr;
 361         int err = -EOPNOTSUPP;
 362
 363         strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 364         ifrr.ifr_ifru = ifr->ifr_ifru;
 365
 366         switch (cmd) {
 367         case SIOCGMIIPHY:
 368         case SIOCGMIIREG:
 369         case SIOCSMIIREG:
 370                 err = dev_eth_ioctl(real_dev, &ifrr, cmd);
 371                 break;
 372         }
 373
 374         if (!err)
 375                 ifr->ifr_ifru = ifrr.ifr_ifru;
 376
 377         return err;
 378 }
 379
 380 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 381 {
 382         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 383         const struct net_device_ops *ops = real_dev->netdev_ops;
 384         int err = 0;
 385
 386         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 387                 err = ops->ndo_neigh_setup(real_dev, pa);
 388
 389         return err;
 390 }
 391
 392 #if IS_ENABLED(CONFIG_FCOE)
 393 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 394                                    struct scatterlist *sgl, unsigned int sgc)
 395 {
 396         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 397         const struct net_device_ops *ops = real_dev->netdev_ops;
 398         int rc = 0;
 399
 400         if (ops->ndo_fcoe_ddp_setup)
 401                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 402
 403         return rc;
 404 }
 405
 406 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 407 {
 408         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 409         const struct net_device_ops *ops = real_dev->netdev_ops;
 410         int len = 0;
 411
 412         if (ops->ndo_fcoe_ddp_done)
 413                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 414
 415         return len;
 416 }
 417
 418 static int vlan_dev_fcoe_enable(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_enable)
 425                 rc = ops->ndo_fcoe_enable(real_dev);
 426         return rc;
 427 }
 428
 429 static int vlan_dev_fcoe_disable(struct net_device *dev)
 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_disable)
 436                 rc = ops->ndo_fcoe_disable(real_dev);
 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 #ifdef NETDEV_FCOE_WWNN
 455 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 456 {
 457         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 458         const struct net_device_ops *ops = real_dev->netdev_ops;
 459         int rc = -EINVAL;
 460
 461         if (ops->ndo_fcoe_get_wwn)
 462                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 463         return rc;
 464 }
 465 #endif
 466
 467 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 468 {
 469         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 470
 471         if (change & IFF_ALLMULTI)
 472                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 473         if (change & IFF_PROMISC)
 474                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 475 }
 476
 477 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 478 {
 479         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 480         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 481 }
 482
 483 static __be16 vlan_parse_protocol(const struct sk_buff *skb)
 484 {
 485         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 486
 487         return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
 488 }
 489
 490 static const struct header_ops vlan_header_ops = {
 491         .create  = vlan_dev_hard_header,
 492         .parse   = eth_header_parse,
 493         .parse_protocol = vlan_parse_protocol,
 494 };
 495
 496 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 497                                      unsigned short type,
 498                                      const void *daddr, const void *saddr,
 499                                      unsigned int len)
 500 {
 501         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 502         struct net_device *real_dev = vlan->real_dev;
 503
 504         if (saddr == NULL)
 505                 saddr = dev->dev_addr;
 506
 507         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 508 }
 509
 510 static const struct header_ops vlan_passthru_header_ops = {
 511         .create  = vlan_passthru_hard_header,
 512         .parse   = eth_header_parse,
 513         .parse_protocol = vlan_parse_protocol,
 514 };
 515
 516 static const struct device_type vlan_type = {
 517         .name   = "vlan",
 518 };
 519
 520 static const struct net_device_ops vlan_netdev_ops;
 521
 522 static int vlan_dev_init(struct net_device *dev)
 523 {
 524         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 525         struct net_device *real_dev = vlan->real_dev;
 526
 527         netif_carrier_off(dev);
 528
 529         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 530         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 531                                           IFF_MASTER | IFF_SLAVE);
 532         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 533                                           (1<<__LINK_STATE_DORMANT))) |
 534                       (1<<__LINK_STATE_PRESENT);
 535
 536         if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
 537                 dev->state |= (1 << __LINK_STATE_NOCARRIER);
 538
 539         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 540                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 541                            NETIF_F_GSO_ENCAP_ALL |
 542                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 543                            NETIF_F_FCOE_CRC | NETIF_F_FSO;
 544
 545         if (real_dev->vlan_features & NETIF_F_HW_MACSEC)
 546                 dev->hw_features |= NETIF_F_HW_MACSEC;
 547
 548         dev->features |= dev->hw_features;
 549         dev->lltx = true;
 550         dev->fcoe_mtu = true;
 551         netif_inherit_tso_max(dev, real_dev);
 552         if (dev->features & NETIF_F_VLAN_FEATURES)
 553                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 554
 555         dev->vlan_features = real_dev->vlan_features &
 556                              ~(NETIF_F_FCOE_CRC | NETIF_F_FSO);
 557         dev->hw_enc_features = vlan_tnl_features(real_dev);
 558         dev->mpls_features = real_dev->mpls_features;
 559
 560         /* ipv6 shared card related stuff */
 561         dev->dev_id = real_dev->dev_id;
 562
 563         if (is_zero_ether_addr(dev->dev_addr)) {
 564                 eth_hw_addr_set(dev, real_dev->dev_addr);
 565                 dev->addr_assign_type = NET_ADDR_STOLEN;
 566         }
 567         if (is_zero_ether_addr(dev->broadcast))
 568                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 569
 570 #if IS_ENABLED(CONFIG_FCOE)
 571         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 572 #endif
 573
 574         dev->needed_headroom = real_dev->needed_headroom;
 575         if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
 576                 dev->header_ops      = &vlan_passthru_header_ops;
 577                 dev->hard_header_len = real_dev->hard_header_len;
 578         } else {
 579                 dev->header_ops      = &vlan_header_ops;
 580                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 581         }
 582
 583         dev->netdev_ops = &vlan_netdev_ops;
 584
 585         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 586
 587         netdev_lockdep_set_classes(dev);
 588
 589         vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 590         if (!vlan->vlan_pcpu_stats)
 591                 return -ENOMEM;
 592
 593         /* Get vlan's reference to real_dev */
 594         netdev_hold(real_dev, &vlan->dev_tracker, GFP_KERNEL);
 595
 596         return 0;
 597 }
 598
 599 /* Note: this function might be called multiple times for the same device. */
 600 void vlan_dev_free_egress_priority(const struct net_device *dev)
 601 {
 602         struct vlan_priority_tci_mapping *pm;
 603         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 604         int i;
 605
 606         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 607                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 608                         vlan->egress_priority_map[i] = pm->next;
 609                         kfree(pm);
 610                 }
 611         }
 612 }
 613
 614 static void vlan_dev_uninit(struct net_device *dev)
 615 {
 616         vlan_dev_free_egress_priority(dev);
 617 }
 618
 619 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 620         netdev_features_t features)
 621 {
 622         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 623         netdev_features_t old_features = features;
 624         netdev_features_t lower_features;
 625
 626         lower_features = netdev_intersect_features((real_dev->vlan_features |
 627                                                     NETIF_F_RXCSUM),
 628                                                    real_dev->features);
 629
 630         /* Add HW_CSUM setting to preserve user ability to control
 631          * checksum offload on the vlan device.
 632          */
 633         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 634                 lower_features |= NETIF_F_HW_CSUM;
 635         features = netdev_intersect_features(features, lower_features);
 636         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 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         strscpy(info->driver, vlan_fullname, sizeof(info->driver));
 653         strscpy(info->version, vlan_version, sizeof(info->version));
 654         strscpy(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 kernel_ethtool_ts_info *info)
 659 {
 660         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 661         return ethtool_get_ts_info_by_layer(vlan->real_dev, info);
 662 }
 663
 664 static void vlan_dev_get_stats64(struct net_device *dev,
 665                                  struct rtnl_link_stats64 *stats)
 666 {
 667         struct vlan_pcpu_stats *p;
 668         u32 rx_errors = 0, tx_dropped = 0;
 669         int i;
 670
 671         for_each_possible_cpu(i) {
 672                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 673                 unsigned int start;
 674
 675                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 676                 do {
 677                         start = u64_stats_fetch_begin(&p->syncp);
 678                         rxpackets       = u64_stats_read(&p->rx_packets);
 679                         rxbytes         = u64_stats_read(&p->rx_bytes);
 680                         rxmulticast     = u64_stats_read(&p->rx_multicast);
 681                         txpackets       = u64_stats_read(&p->tx_packets);
 682                         txbytes         = u64_stats_read(&p->tx_bytes);
 683                 } while (u64_stats_fetch_retry(&p->syncp, start));
 684
 685                 stats->rx_packets       += rxpackets;
 686                 stats->rx_bytes         += rxbytes;
 687                 stats->multicast        += rxmulticast;
 688                 stats->tx_packets       += txpackets;
 689                 stats->tx_bytes         += txbytes;
 690                 /* rx_errors & tx_dropped are u32 */
 691                 rx_errors       += READ_ONCE(p->rx_errors);
 692                 tx_dropped      += READ_ONCE(p->tx_dropped);
 693         }
 694         stats->rx_errors  = rx_errors;
 695         stats->tx_dropped = tx_dropped;
 696 }
 697
 698 #ifdef CONFIG_NET_POLL_CONTROLLER
 699 static void vlan_dev_poll_controller(struct net_device *dev)
 700 {
 701         return;
 702 }
 703
 704 static int vlan_dev_netpoll_setup(struct net_device *dev)
 705 {
 706         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 707         struct net_device *real_dev = vlan->real_dev;
 708         struct netpoll *netpoll;
 709         int err = 0;
 710
 711         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 712         err = -ENOMEM;
 713         if (!netpoll)
 714                 goto out;
 715
 716         err = __netpoll_setup(netpoll, real_dev);
 717         if (err) {
 718                 kfree(netpoll);
 719                 goto out;
 720         }
 721
 722         vlan->netpoll = netpoll;
 723
 724 out:
 725         return err;
 726 }
 727
 728 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 729 {
 730         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 731         struct netpoll *netpoll = vlan->netpoll;
 732
 733         if (!netpoll)
 734                 return;
 735
 736         vlan->netpoll = NULL;
 737         __netpoll_free(netpoll);
 738 }
 739 #endif /* CONFIG_NET_POLL_CONTROLLER */
 740
 741 static int vlan_dev_get_iflink(const struct net_device *dev)
 742 {
 743         const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 744
 745         return READ_ONCE(real_dev->ifindex);
 746 }
 747
 748 static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
 749                                       struct net_device_path *path)
 750 {
 751         struct vlan_dev_priv *vlan = vlan_dev_priv(ctx->dev);
 752
 753         path->type = DEV_PATH_VLAN;
 754         path->encap.id = vlan->vlan_id;
 755         path->encap.proto = vlan->vlan_proto;
 756         path->dev = ctx->dev;
 757         ctx->dev = vlan->real_dev;
 758         if (ctx->num_vlans >= ARRAY_SIZE(ctx->vlan))
 759                 return -ENOSPC;
 760
 761         ctx->vlan[ctx->num_vlans].id = vlan->vlan_id;
 762         ctx->vlan[ctx->num_vlans].proto = vlan->vlan_proto;
 763         ctx->num_vlans++;
 764
 765         return 0;
 766 }
 767
 768 #if IS_ENABLED(CONFIG_MACSEC)
 769
 770 static const struct macsec_ops *vlan_get_macsec_ops(const struct macsec_context *ctx)
 771 {
 772         return vlan_dev_priv(ctx->netdev)->real_dev->macsec_ops;
 773 }
 774
 775 static int vlan_macsec_offload(int (* const func)(struct macsec_context *),
 776                                struct macsec_context *ctx)
 777 {
 778         if (unlikely(!func))
 779                 return 0;
 780
 781         return (*func)(ctx);
 782 }
 783
 784 static int vlan_macsec_dev_open(struct macsec_context *ctx)
 785 {
 786         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 787
 788         if (!ops)
 789                 return -EOPNOTSUPP;
 790
 791         return vlan_macsec_offload(ops->mdo_dev_open, ctx);
 792 }
 793
 794 static int vlan_macsec_dev_stop(struct macsec_context *ctx)
 795 {
 796         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 797
 798         if (!ops)
 799                 return -EOPNOTSUPP;
 800
 801         return vlan_macsec_offload(ops->mdo_dev_stop, ctx);
 802 }
 803
 804 static int vlan_macsec_add_secy(struct macsec_context *ctx)
 805 {
 806         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 807
 808         if (!ops)
 809                 return -EOPNOTSUPP;
 810
 811         return vlan_macsec_offload(ops->mdo_add_secy, ctx);
 812 }
 813
 814 static int vlan_macsec_upd_secy(struct macsec_context *ctx)
 815 {
 816         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 817
 818         if (!ops)
 819                 return -EOPNOTSUPP;
 820
 821         return vlan_macsec_offload(ops->mdo_upd_secy, ctx);
 822 }
 823
 824 static int vlan_macsec_del_secy(struct macsec_context *ctx)
 825 {
 826         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 827
 828         if (!ops)
 829                 return -EOPNOTSUPP;
 830
 831         return vlan_macsec_offload(ops->mdo_del_secy, ctx);
 832 }
 833
 834 static int vlan_macsec_add_rxsc(struct macsec_context *ctx)
 835 {
 836         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 837
 838         if (!ops)
 839                 return -EOPNOTSUPP;
 840
 841         return vlan_macsec_offload(ops->mdo_add_rxsc, ctx);
 842 }
 843
 844 static int vlan_macsec_upd_rxsc(struct macsec_context *ctx)
 845 {
 846         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 847
 848         if (!ops)
 849                 return -EOPNOTSUPP;
 850
 851         return vlan_macsec_offload(ops->mdo_upd_rxsc, ctx);
 852 }
 853
 854 static int vlan_macsec_del_rxsc(struct macsec_context *ctx)
 855 {
 856         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 857
 858         if (!ops)
 859                 return -EOPNOTSUPP;
 860
 861         return vlan_macsec_offload(ops->mdo_del_rxsc, ctx);
 862 }
 863
 864 static int vlan_macsec_add_rxsa(struct macsec_context *ctx)
 865 {
 866         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 867
 868         if (!ops)
 869                 return -EOPNOTSUPP;
 870
 871         return vlan_macsec_offload(ops->mdo_add_rxsa, ctx);
 872 }
 873
 874 static int vlan_macsec_upd_rxsa(struct macsec_context *ctx)
 875 {
 876         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 877
 878         if (!ops)
 879                 return -EOPNOTSUPP;
 880
 881         return vlan_macsec_offload(ops->mdo_upd_rxsa, ctx);
 882 }
 883
 884 static int vlan_macsec_del_rxsa(struct macsec_context *ctx)
 885 {
 886         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 887
 888         if (!ops)
 889                 return -EOPNOTSUPP;
 890
 891         return vlan_macsec_offload(ops->mdo_del_rxsa, ctx);
 892 }
 893
 894 static int vlan_macsec_add_txsa(struct macsec_context *ctx)
 895 {
 896         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 897
 898         if (!ops)
 899                 return -EOPNOTSUPP;
 900
 901         return vlan_macsec_offload(ops->mdo_add_txsa, ctx);
 902 }
 903
 904 static int vlan_macsec_upd_txsa(struct macsec_context *ctx)
 905 {
 906         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 907
 908         if (!ops)
 909                 return -EOPNOTSUPP;
 910
 911         return vlan_macsec_offload(ops->mdo_upd_txsa, ctx);
 912 }
 913
 914 static int vlan_macsec_del_txsa(struct macsec_context *ctx)
 915 {
 916         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 917
 918         if (!ops)
 919                 return -EOPNOTSUPP;
 920
 921         return vlan_macsec_offload(ops->mdo_del_txsa, ctx);
 922 }
 923
 924 static int vlan_macsec_get_dev_stats(struct macsec_context *ctx)
 925 {
 926         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 927
 928         if (!ops)
 929                 return -EOPNOTSUPP;
 930
 931         return vlan_macsec_offload(ops->mdo_get_dev_stats, ctx);
 932 }
 933
 934 static int vlan_macsec_get_tx_sc_stats(struct macsec_context *ctx)
 935 {
 936         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 937
 938         if (!ops)
 939                 return -EOPNOTSUPP;
 940
 941         return vlan_macsec_offload(ops->mdo_get_tx_sc_stats, ctx);
 942 }
 943
 944 static int vlan_macsec_get_tx_sa_stats(struct macsec_context *ctx)
 945 {
 946         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 947
 948         if (!ops)
 949                 return -EOPNOTSUPP;
 950
 951         return vlan_macsec_offload(ops->mdo_get_tx_sa_stats, ctx);
 952 }
 953
 954 static int vlan_macsec_get_rx_sc_stats(struct macsec_context *ctx)
 955 {
 956         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 957
 958         if (!ops)
 959                 return -EOPNOTSUPP;
 960
 961         return vlan_macsec_offload(ops->mdo_get_rx_sc_stats, ctx);
 962 }
 963
 964 static int vlan_macsec_get_rx_sa_stats(struct macsec_context *ctx)
 965 {
 966         const struct macsec_ops *ops = vlan_get_macsec_ops(ctx);
 967
 968         if (!ops)
 969                 return -EOPNOTSUPP;
 970
 971         return vlan_macsec_offload(ops->mdo_get_rx_sa_stats, ctx);
 972 }
 973
 974 static const struct macsec_ops macsec_offload_ops = {
 975         /* Device wide */
 976         .mdo_dev_open = vlan_macsec_dev_open,
 977         .mdo_dev_stop = vlan_macsec_dev_stop,
 978         /* SecY */
 979         .mdo_add_secy = vlan_macsec_add_secy,
 980         .mdo_upd_secy = vlan_macsec_upd_secy,
 981         .mdo_del_secy = vlan_macsec_del_secy,
 982         /* Security channels */
 983         .mdo_add_rxsc = vlan_macsec_add_rxsc,
 984         .mdo_upd_rxsc = vlan_macsec_upd_rxsc,
 985         .mdo_del_rxsc = vlan_macsec_del_rxsc,
 986         /* Security associations */
 987         .mdo_add_rxsa = vlan_macsec_add_rxsa,
 988         .mdo_upd_rxsa = vlan_macsec_upd_rxsa,
 989         .mdo_del_rxsa = vlan_macsec_del_rxsa,
 990         .mdo_add_txsa = vlan_macsec_add_txsa,
 991         .mdo_upd_txsa = vlan_macsec_upd_txsa,
 992         .mdo_del_txsa = vlan_macsec_del_txsa,
 993         /* Statistics */
 994         .mdo_get_dev_stats = vlan_macsec_get_dev_stats,
 995         .mdo_get_tx_sc_stats = vlan_macsec_get_tx_sc_stats,
 996         .mdo_get_tx_sa_stats = vlan_macsec_get_tx_sa_stats,
 997         .mdo_get_rx_sc_stats = vlan_macsec_get_rx_sc_stats,
 998         .mdo_get_rx_sa_stats = vlan_macsec_get_rx_sa_stats,
 999 };
1000
1001 #endif
1002
1003 static const struct ethtool_ops vlan_ethtool_ops = {
1004         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
1005         .get_drvinfo            = vlan_ethtool_get_drvinfo,
1006         .get_link               = ethtool_op_get_link,
1007         .get_ts_info            = vlan_ethtool_get_ts_info,
1008 };
1009
1010 static const struct net_device_ops vlan_netdev_ops = {
1011         .ndo_change_mtu         = vlan_dev_change_mtu,
1012         .ndo_init               = vlan_dev_init,
1013         .ndo_uninit             = vlan_dev_uninit,
1014         .ndo_open               = vlan_dev_open,
1015         .ndo_stop               = vlan_dev_stop,
1016         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
1017         .ndo_validate_addr      = eth_validate_addr,
1018         .ndo_set_mac_address    = vlan_dev_set_mac_address,
1019         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
1020         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
1021         .ndo_eth_ioctl          = vlan_dev_ioctl,
1022         .ndo_neigh_setup        = vlan_dev_neigh_setup,
1023         .ndo_get_stats64        = vlan_dev_get_stats64,
1024 #if IS_ENABLED(CONFIG_FCOE)
1025         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
1026         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
1027         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
1028         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
1029         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
1030 #endif
1031 #ifdef NETDEV_FCOE_WWNN
1032         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
1033 #endif
1034 #ifdef CONFIG_NET_POLL_CONTROLLER
1035         .ndo_poll_controller    = vlan_dev_poll_controller,
1036         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
1037         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
1038 #endif
1039         .ndo_fix_features       = vlan_dev_fix_features,
1040         .ndo_get_iflink         = vlan_dev_get_iflink,
1041         .ndo_fill_forward_path  = vlan_dev_fill_forward_path,
1042         .ndo_hwtstamp_get       = vlan_hwtstamp_get,
1043         .ndo_hwtstamp_set       = vlan_hwtstamp_set,
1044 };
1045
1046 static void vlan_dev_free(struct net_device *dev)
1047 {
1048         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
1049
1050         free_percpu(vlan->vlan_pcpu_stats);
1051         vlan->vlan_pcpu_stats = NULL;
1052
1053         /* Get rid of the vlan's reference to real_dev */
1054         netdev_put(vlan->real_dev, &vlan->dev_tracker);
1055 }
1056
1057 void vlan_setup(struct net_device *dev)
1058 {
1059         ether_setup(dev);
1060
1061         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
1062         dev->priv_flags         |= IFF_UNICAST_FLT;
1063         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
1064         netif_keep_dst(dev);
1065
1066         dev->netdev_ops         = &vlan_netdev_ops;
1067         dev->needs_free_netdev  = true;
1068         dev->priv_destructor    = vlan_dev_free;
1069         dev->ethtool_ops        = &vlan_ethtool_ops;
1070
1071 #if IS_ENABLED(CONFIG_MACSEC)
1072         dev->macsec_ops         = &macsec_offload_ops;
1073 #endif
1074         dev->min_mtu            = 0;
1075         dev->max_mtu            = ETH_MAX_MTU;
1076
1077         eth_zero_addr(dev->broadcast);
1078 }