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
  30 #include "vlan.h"
  31 #include "vlanproc.h"
  32 #include <linux/if_vlan.h>
  33 #include <linux/netpoll.h>
  34
  35 /*
  36  *      Create the VLAN header for an arbitrary protocol layer
  37  *
  38  *      saddr=NULL      means use device source address
  39  *      daddr=NULL      means leave destination address (eg unresolved arp)
  40  *
  41  *  This is called when the SKB is moving down the stack towards the
  42  *  physical devices.
  43  */
  44 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  45                                 unsigned short type,
  46                                 const void *daddr, const void *saddr,
  47                                 unsigned int len)
  48 {
  49         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  50         struct vlan_hdr *vhdr;
  51         unsigned int vhdrlen = 0;
  52         u16 vlan_tci = 0;
  53         int rc;
  54
  55         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  56                 vhdr = skb_push(skb, VLAN_HLEN);
  57
  58                 vlan_tci = vlan->vlan_id;
  59                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  60                 vhdr->h_vlan_TCI = htons(vlan_tci);
  61
  62                 /*
  63                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  64                  *  put the length in here instead.
  65                  */
  66                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  67                         vhdr->h_vlan_encapsulated_proto = htons(type);
  68                 else
  69                         vhdr->h_vlan_encapsulated_proto = htons(len);
  70
  71                 skb->protocol = vlan->vlan_proto;
  72                 type = ntohs(vlan->vlan_proto);
  73                 vhdrlen = VLAN_HLEN;
  74         }
  75
  76         /* Before delegating work to the lower layer, enter our MAC-address */
  77         if (saddr == NULL)
  78                 saddr = dev->dev_addr;
  79
  80         /* Now make the underlying real hard header */
  81         dev = vlan->real_dev;
  82         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  83         if (rc > 0)
  84                 rc += vhdrlen;
  85         return rc;
  86 }
  87
  88 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  89 {
  90 #ifdef CONFIG_NET_POLL_CONTROLLER
  91         return netpoll_send_skb(vlan->netpoll, skb);
  92 #else
  93         BUG();
  94         return NETDEV_TX_OK;
  95 #endif
  96 }
  97
  98 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
  99                                             struct net_device *dev)
 100 {
 101         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 102         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 103         unsigned int len;
 104         int ret;
 105
 106         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 107          *
 108          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 109          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 110          */
 111         if (veth->h_vlan_proto != vlan->vlan_proto ||
 112             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 113                 u16 vlan_tci;
 114                 vlan_tci = vlan->vlan_id;
 115                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 116                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 117         }
 118
 119         skb->dev = vlan->real_dev;
 120         len = skb->len;
 121         if (unlikely(netpoll_tx_running(dev)))
 122                 return vlan_netpoll_send_skb(vlan, skb);
 123
 124         ret = dev_queue_xmit(skb);
 125
 126         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 127                 struct vlan_pcpu_stats *stats;
 128
 129                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 130                 u64_stats_update_begin(&stats->syncp);
 131                 stats->tx_packets++;
 132                 stats->tx_bytes += len;
 133                 u64_stats_update_end(&stats->syncp);
 134         } else {
 135                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 136         }
 137
 138         return ret;
 139 }
 140
 141 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 142 {
 143         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 144         unsigned int max_mtu = real_dev->mtu;
 145
 146         if (netif_reduces_vlan_mtu(real_dev))
 147                 max_mtu -= VLAN_HLEN;
 148         if (max_mtu < new_mtu)
 149                 return -ERANGE;
 150
 151         dev->mtu = new_mtu;
 152
 153         return 0;
 154 }
 155
 156 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 157                                    u32 skb_prio, u16 vlan_prio)
 158 {
 159         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 160
 161         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 162                 vlan->nr_ingress_mappings--;
 163         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 164                 vlan->nr_ingress_mappings++;
 165
 166         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 167 }
 168
 169 int vlan_dev_set_egress_priority(const struct net_device *dev,
 170                                  u32 skb_prio, u16 vlan_prio)
 171 {
 172         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 173         struct vlan_priority_tci_mapping *mp = NULL;
 174         struct vlan_priority_tci_mapping *np;
 175         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 176
 177         /* See if a priority mapping exists.. */
 178         mp = vlan->egress_priority_map[skb_prio & 0xF];
 179         while (mp) {
 180                 if (mp->priority == skb_prio) {
 181                         if (mp->vlan_qos && !vlan_qos)
 182                                 vlan->nr_egress_mappings--;
 183                         else if (!mp->vlan_qos && vlan_qos)
 184                                 vlan->nr_egress_mappings++;
 185                         mp->vlan_qos = vlan_qos;
 186                         return 0;
 187                 }
 188                 mp = mp->next;
 189         }
 190
 191         /* Create a new mapping then. */
 192         mp = vlan->egress_priority_map[skb_prio & 0xF];
 193         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 194         if (!np)
 195                 return -ENOBUFS;
 196
 197         np->next = mp;
 198         np->priority = skb_prio;
 199         np->vlan_qos = vlan_qos;
 200         /* Before inserting this element in hash table, make sure all its fields
 201          * are committed to memory.
 202          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 203          */
 204         smp_wmb();
 205         vlan->egress_priority_map[skb_prio & 0xF] = np;
 206         if (vlan_qos)
 207                 vlan->nr_egress_mappings++;
 208         return 0;
 209 }
 210
 211 /* Flags are defined in the vlan_flags enum in
 212  * include/uapi/linux/if_vlan.h file.
 213  */
 214 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 215 {
 216         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 217         u32 old_flags = vlan->flags;
 218
 219         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 220                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
 221                      VLAN_FLAG_BRIDGE_BINDING))
 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 bool vlan_dev_inherit_address(struct net_device *dev,
 248                               struct net_device *real_dev)
 249 {
 250         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 251                 return false;
 252
 253         ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 254         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 255         return true;
 256 }
 257
 258 static int vlan_dev_open(struct net_device *dev)
 259 {
 260         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 261         struct net_device *real_dev = vlan->real_dev;
 262         int err;
 263
 264         if (!(real_dev->flags & IFF_UP) &&
 265             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 266                 return -ENETDOWN;
 267
 268         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 269             !vlan_dev_inherit_address(dev, real_dev)) {
 270                 err = dev_uc_add(real_dev, dev->dev_addr);
 271                 if (err < 0)
 272                         goto out;
 273         }
 274
 275         if (dev->flags & IFF_ALLMULTI) {
 276                 err = dev_set_allmulti(real_dev, 1);
 277                 if (err < 0)
 278                         goto del_unicast;
 279         }
 280         if (dev->flags & IFF_PROMISC) {
 281                 err = dev_set_promiscuity(real_dev, 1);
 282                 if (err < 0)
 283                         goto clear_allmulti;
 284         }
 285
 286         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 287
 288         if (vlan->flags & VLAN_FLAG_GVRP)
 289                 vlan_gvrp_request_join(dev);
 290
 291         if (vlan->flags & VLAN_FLAG_MVRP)
 292                 vlan_mvrp_request_join(dev);
 293
 294         if (netif_carrier_ok(real_dev) &&
 295             !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 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         if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 326                 netif_carrier_off(dev);
 327         return 0;
 328 }
 329
 330 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 331 {
 332         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 333         struct sockaddr *addr = p;
 334         int err;
 335
 336         if (!is_valid_ether_addr(addr->sa_data))
 337                 return -EADDRNOTAVAIL;
 338
 339         if (!(dev->flags & IFF_UP))
 340                 goto out;
 341
 342         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 343                 err = dev_uc_add(real_dev, addr->sa_data);
 344                 if (err < 0)
 345                         return err;
 346         }
 347
 348         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 349                 dev_uc_del(real_dev, dev->dev_addr);
 350
 351 out:
 352         ether_addr_copy(dev->dev_addr, addr->sa_data);
 353         return 0;
 354 }
 355
 356 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 357 {
 358         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 359         const struct net_device_ops *ops = real_dev->netdev_ops;
 360         struct ifreq ifrr;
 361         int err = -EOPNOTSUPP;
 362
 363         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 364         ifrr.ifr_ifru = ifr->ifr_ifru;
 365
 366         switch (cmd) {
 367         case SIOCSHWTSTAMP:
 368                 if (!net_eq(dev_net(dev), &init_net))
 369                         break;
 370                 fallthrough;
 371         case SIOCGMIIPHY:
 372         case SIOCGMIIREG:
 373         case SIOCSMIIREG:
 374         case SIOCGHWTSTAMP:
 375                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 376                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 377                 break;
 378         }
 379
 380         if (!err)
 381                 ifr->ifr_ifru = ifrr.ifr_ifru;
 382
 383         return err;
 384 }
 385
 386 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 387 {
 388         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 389         const struct net_device_ops *ops = real_dev->netdev_ops;
 390         int err = 0;
 391
 392         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 393                 err = ops->ndo_neigh_setup(real_dev, pa);
 394
 395         return err;
 396 }
 397
 398 #if IS_ENABLED(CONFIG_FCOE)
 399 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 400                                    struct scatterlist *sgl, unsigned int sgc)
 401 {
 402         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 403         const struct net_device_ops *ops = real_dev->netdev_ops;
 404         int rc = 0;
 405
 406         if (ops->ndo_fcoe_ddp_setup)
 407                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 408
 409         return rc;
 410 }
 411
 412 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 413 {
 414         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 415         const struct net_device_ops *ops = real_dev->netdev_ops;
 416         int len = 0;
 417
 418         if (ops->ndo_fcoe_ddp_done)
 419                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 420
 421         return len;
 422 }
 423
 424 static int vlan_dev_fcoe_enable(struct net_device *dev)
 425 {
 426         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 427         const struct net_device_ops *ops = real_dev->netdev_ops;
 428         int rc = -EINVAL;
 429
 430         if (ops->ndo_fcoe_enable)
 431                 rc = ops->ndo_fcoe_enable(real_dev);
 432         return rc;
 433 }
 434
 435 static int vlan_dev_fcoe_disable(struct net_device *dev)
 436 {
 437         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 438         const struct net_device_ops *ops = real_dev->netdev_ops;
 439         int rc = -EINVAL;
 440
 441         if (ops->ndo_fcoe_disable)
 442                 rc = ops->ndo_fcoe_disable(real_dev);
 443         return rc;
 444 }
 445
 446 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 447                                     struct scatterlist *sgl, unsigned int sgc)
 448 {
 449         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 450         const struct net_device_ops *ops = real_dev->netdev_ops;
 451         int rc = 0;
 452
 453         if (ops->ndo_fcoe_ddp_target)
 454                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 455
 456         return rc;
 457 }
 458 #endif
 459
 460 #ifdef NETDEV_FCOE_WWNN
 461 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 462 {
 463         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 464         const struct net_device_ops *ops = real_dev->netdev_ops;
 465         int rc = -EINVAL;
 466
 467         if (ops->ndo_fcoe_get_wwn)
 468                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 469         return rc;
 470 }
 471 #endif
 472
 473 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 474 {
 475         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 476
 477         if (dev->flags & IFF_UP) {
 478                 if (change & IFF_ALLMULTI)
 479                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 480                 if (change & IFF_PROMISC)
 481                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 482         }
 483 }
 484
 485 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 486 {
 487         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 488         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 489 }
 490
 491 /*
 492  * vlan network devices have devices nesting below it, and are a special
 493  * "super class" of normal network devices; split their locks off into a
 494  * separate class since they always nest.
 495  */
 496 static struct lock_class_key vlan_netdev_xmit_lock_key;
 497 static struct lock_class_key vlan_netdev_addr_lock_key;
 498
 499 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 500                                      struct netdev_queue *txq,
 501                                      void *unused)
 502 {
 503         lockdep_set_class(&txq->_xmit_lock, &vlan_netdev_xmit_lock_key);
 504 }
 505
 506 static void vlan_dev_set_lockdep_class(struct net_device *dev)
 507 {
 508         lockdep_set_class(&dev->addr_list_lock,
 509                           &vlan_netdev_addr_lock_key);
 510         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL);
 511 }
 512
 513 static const struct header_ops vlan_header_ops = {
 514         .create  = vlan_dev_hard_header,
 515         .parse   = eth_header_parse,
 516 };
 517
 518 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 519                                      unsigned short type,
 520                                      const void *daddr, const void *saddr,
 521                                      unsigned int len)
 522 {
 523         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 524         struct net_device *real_dev = vlan->real_dev;
 525
 526         if (saddr == NULL)
 527                 saddr = dev->dev_addr;
 528
 529         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 530 }
 531
 532 static const struct header_ops vlan_passthru_header_ops = {
 533         .create  = vlan_passthru_hard_header,
 534         .parse   = eth_header_parse,
 535 };
 536
 537 static struct device_type vlan_type = {
 538         .name   = "vlan",
 539 };
 540
 541 static const struct net_device_ops vlan_netdev_ops;
 542
 543 static int vlan_dev_init(struct net_device *dev)
 544 {
 545         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 546         struct net_device *real_dev = vlan->real_dev;
 547
 548         netif_carrier_off(dev);
 549
 550         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 551         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 552                                           IFF_MASTER | IFF_SLAVE);
 553         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 554                                           (1<<__LINK_STATE_DORMANT))) |
 555                       (1<<__LINK_STATE_PRESENT);
 556
 557         if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
 558                 dev->state |= (1 << __LINK_STATE_NOCARRIER);
 559
 560         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 561                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 562                            NETIF_F_GSO_ENCAP_ALL |
 563                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 564                            NETIF_F_ALL_FCOE;
 565
 566         dev->features |= dev->hw_features | NETIF_F_LLTX;
 567         dev->gso_max_size = real_dev->gso_max_size;
 568         dev->gso_max_segs = real_dev->gso_max_segs;
 569         if (dev->features & NETIF_F_VLAN_FEATURES)
 570                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 571
 572         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 573         dev->hw_enc_features = vlan_tnl_features(real_dev);
 574         dev->mpls_features = real_dev->mpls_features;
 575
 576         /* ipv6 shared card related stuff */
 577         dev->dev_id = real_dev->dev_id;
 578
 579         if (is_zero_ether_addr(dev->dev_addr)) {
 580                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 581                 dev->addr_assign_type = NET_ADDR_STOLEN;
 582         }
 583         if (is_zero_ether_addr(dev->broadcast))
 584                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 585
 586 #if IS_ENABLED(CONFIG_FCOE)
 587         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 588 #endif
 589
 590         dev->needed_headroom = real_dev->needed_headroom;
 591         if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
 592                 dev->header_ops      = &vlan_passthru_header_ops;
 593                 dev->hard_header_len = real_dev->hard_header_len;
 594         } else {
 595                 dev->header_ops      = &vlan_header_ops;
 596                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 597         }
 598
 599         dev->netdev_ops = &vlan_netdev_ops;
 600
 601         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 602
 603         vlan_dev_set_lockdep_class(dev);
 604
 605         vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 606         if (!vlan->vlan_pcpu_stats)
 607                 return -ENOMEM;
 608
 609         return 0;
 610 }
 611
 612 /* Note: this function might be called multiple times for the same device. */
 613 void vlan_dev_uninit(struct net_device *dev)
 614 {
 615         struct vlan_priority_tci_mapping *pm;
 616         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 617         int i;
 618
 619         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 620                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 621                         vlan->egress_priority_map[i] = pm->next;
 622                         kfree(pm);
 623                 }
 624         }
 625 }
 626
 627 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 628         netdev_features_t features)
 629 {
 630         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 631         netdev_features_t old_features = features;
 632         netdev_features_t lower_features;
 633
 634         lower_features = netdev_intersect_features((real_dev->vlan_features |
 635                                                     NETIF_F_RXCSUM),
 636                                                    real_dev->features);
 637
 638         /* Add HW_CSUM setting to preserve user ability to control
 639          * checksum offload on the vlan device.
 640          */
 641         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 642                 lower_features |= NETIF_F_HW_CSUM;
 643         features = netdev_intersect_features(features, lower_features);
 644         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 645         features |= NETIF_F_LLTX;
 646
 647         return features;
 648 }
 649
 650 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 651                                            struct ethtool_link_ksettings *cmd)
 652 {
 653         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 654
 655         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 656 }
 657
 658 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 659                                      struct ethtool_drvinfo *info)
 660 {
 661         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 662         strlcpy(info->version, vlan_version, sizeof(info->version));
 663         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 664 }
 665
 666 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 667                                     struct ethtool_ts_info *info)
 668 {
 669         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 670         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 671         struct phy_device *phydev = vlan->real_dev->phydev;
 672
 673         if (phy_has_tsinfo(phydev)) {
 674                 return phy_ts_info(phydev, info);
 675         } else if (ops->get_ts_info) {
 676                 return ops->get_ts_info(vlan->real_dev, info);
 677         } else {
 678                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 679                         SOF_TIMESTAMPING_SOFTWARE;
 680                 info->phc_index = -1;
 681         }
 682
 683         return 0;
 684 }
 685
 686 static void vlan_dev_get_stats64(struct net_device *dev,
 687                                  struct rtnl_link_stats64 *stats)
 688 {
 689         struct vlan_pcpu_stats *p;
 690         u32 rx_errors = 0, tx_dropped = 0;
 691         int i;
 692
 693         for_each_possible_cpu(i) {
 694                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 695                 unsigned int start;
 696
 697                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 698                 do {
 699                         start = u64_stats_fetch_begin_irq(&p->syncp);
 700                         rxpackets       = p->rx_packets;
 701                         rxbytes         = p->rx_bytes;
 702                         rxmulticast     = p->rx_multicast;
 703                         txpackets       = p->tx_packets;
 704                         txbytes         = p->tx_bytes;
 705                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 706
 707                 stats->rx_packets       += rxpackets;
 708                 stats->rx_bytes         += rxbytes;
 709                 stats->multicast        += rxmulticast;
 710                 stats->tx_packets       += txpackets;
 711                 stats->tx_bytes         += txbytes;
 712                 /* rx_errors & tx_dropped are u32 */
 713                 rx_errors       += p->rx_errors;
 714                 tx_dropped      += p->tx_dropped;
 715         }
 716         stats->rx_errors  = rx_errors;
 717         stats->tx_dropped = tx_dropped;
 718 }
 719
 720 #ifdef CONFIG_NET_POLL_CONTROLLER
 721 static void vlan_dev_poll_controller(struct net_device *dev)
 722 {
 723         return;
 724 }
 725
 726 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 727 {
 728         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 729         struct net_device *real_dev = vlan->real_dev;
 730         struct netpoll *netpoll;
 731         int err = 0;
 732
 733         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 734         err = -ENOMEM;
 735         if (!netpoll)
 736                 goto out;
 737
 738         err = __netpoll_setup(netpoll, real_dev);
 739         if (err) {
 740                 kfree(netpoll);
 741                 goto out;
 742         }
 743
 744         vlan->netpoll = netpoll;
 745
 746 out:
 747         return err;
 748 }
 749
 750 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 751 {
 752         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 753         struct netpoll *netpoll = vlan->netpoll;
 754
 755         if (!netpoll)
 756                 return;
 757
 758         vlan->netpoll = NULL;
 759         __netpoll_free(netpoll);
 760 }
 761 #endif /* CONFIG_NET_POLL_CONTROLLER */
 762
 763 static int vlan_dev_get_iflink(const struct net_device *dev)
 764 {
 765         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 766
 767         return real_dev->ifindex;
 768 }
 769
 770 static const struct ethtool_ops vlan_ethtool_ops = {
 771         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 772         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 773         .get_link               = ethtool_op_get_link,
 774         .get_ts_info            = vlan_ethtool_get_ts_info,
 775 };
 776
 777 static const struct net_device_ops vlan_netdev_ops = {
 778         .ndo_change_mtu         = vlan_dev_change_mtu,
 779         .ndo_init               = vlan_dev_init,
 780         .ndo_uninit             = vlan_dev_uninit,
 781         .ndo_open               = vlan_dev_open,
 782         .ndo_stop               = vlan_dev_stop,
 783         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 784         .ndo_validate_addr      = eth_validate_addr,
 785         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 786         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 787         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 788         .ndo_do_ioctl           = vlan_dev_ioctl,
 789         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 790         .ndo_get_stats64        = vlan_dev_get_stats64,
 791 #if IS_ENABLED(CONFIG_FCOE)
 792         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 793         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 794         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 795         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 796         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 797 #endif
 798 #ifdef NETDEV_FCOE_WWNN
 799         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 800 #endif
 801 #ifdef CONFIG_NET_POLL_CONTROLLER
 802         .ndo_poll_controller    = vlan_dev_poll_controller,
 803         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 804         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 805 #endif
 806         .ndo_fix_features       = vlan_dev_fix_features,
 807         .ndo_get_iflink         = vlan_dev_get_iflink,
 808 };
 809
 810 static void vlan_dev_free(struct net_device *dev)
 811 {
 812         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 813
 814         free_percpu(vlan->vlan_pcpu_stats);
 815         vlan->vlan_pcpu_stats = NULL;
 816 }
 817
 818 void vlan_setup(struct net_device *dev)
 819 {
 820         ether_setup(dev);
 821
 822         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 823         dev->priv_flags         |= IFF_UNICAST_FLT;
 824         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 825         netif_keep_dst(dev);
 826
 827         dev->netdev_ops         = &vlan_netdev_ops;
 828         dev->needs_free_netdev  = true;
 829         dev->priv_destructor    = vlan_dev_free;
 830         dev->ethtool_ops        = &vlan_ethtool_ops;
 831
 832         dev->min_mtu            = 0;
 833         dev->max_mtu            = ETH_MAX_MTU;
 834
 835         eth_zero_addr(dev->broadcast);
 836 }