net/8021q/vlan_dev.c

   1 /* -*- linux-c -*-
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
  10  *                - reset skb->pkt_type on incoming packets when MAC was changed
  11  *                - see that changed MAC is saddr for outgoing packets
  12  *              Oct 20, 2001:  Ard van Breeman:
  13  *                - Fix MC-list, finally.
  14  *                - Flush MC-list on VLAN destroy.
  15  *
  16  *
  17  *              This program is free software; you can redistribute it and/or
  18  *              modify it under the terms of the GNU General Public License
  19  *              as published by the Free Software Foundation; either version
  20  *              2 of the License, or (at your option) any later version.
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/net_tstamp.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/phy.h>
  33 #include <net/arp.h>
  34 #include <net/switchdev.h>
  35
  36 #include "vlan.h"
  37 #include "vlanproc.h"
  38 #include <linux/if_vlan.h>
  39 #include <linux/netpoll.h>
  40
  41 /*
  42  *      Create the VLAN header for an arbitrary protocol layer
  43  *
  44  *      saddr=NULL      means use device source address
  45  *      daddr=NULL      means leave destination address (eg unresolved arp)
  46  *
  47  *  This is called when the SKB is moving down the stack towards the
  48  *  physical devices.
  49  */
  50 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  51                                 unsigned short type,
  52                                 const void *daddr, const void *saddr,
  53                                 unsigned int len)
  54 {
  55         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  56         struct vlan_hdr *vhdr;
  57         unsigned int vhdrlen = 0;
  58         u16 vlan_tci = 0;
  59         int rc;
  60
  61         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  62                 vhdr = skb_push(skb, VLAN_HLEN);
  63
  64                 vlan_tci = vlan->vlan_id;
  65                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  66                 vhdr->h_vlan_TCI = htons(vlan_tci);
  67
  68                 /*
  69                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  70                  *  put the length in here instead.
  71                  */
  72                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  73                         vhdr->h_vlan_encapsulated_proto = htons(type);
  74                 else
  75                         vhdr->h_vlan_encapsulated_proto = htons(len);
  76
  77                 skb->protocol = vlan->vlan_proto;
  78                 type = ntohs(vlan->vlan_proto);
  79                 vhdrlen = VLAN_HLEN;
  80         }
  81
  82         /* Before delegating work to the lower layer, enter our MAC-address */
  83         if (saddr == NULL)
  84                 saddr = dev->dev_addr;
  85
  86         /* Now make the underlying real hard header */
  87         dev = vlan->real_dev;
  88         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  89         if (rc > 0)
  90                 rc += vhdrlen;
  91         return rc;
  92 }
  93
  94 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  95 {
  96 #ifdef CONFIG_NET_POLL_CONTROLLER
  97         if (vlan->netpoll)
  98                 netpoll_send_skb(vlan->netpoll, skb);
  99 #else
 100         BUG();
 101 #endif
 102         return NETDEV_TX_OK;
 103 }
 104
 105 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 106                                             struct net_device *dev)
 107 {
 108         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 109         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 110         unsigned int len;
 111         int ret;
 112
 113         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 114          *
 115          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 116          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 117          */
 118         if (veth->h_vlan_proto != vlan->vlan_proto ||
 119             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 120                 u16 vlan_tci;
 121                 vlan_tci = vlan->vlan_id;
 122                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 123                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 124         }
 125
 126         skb->dev = vlan->real_dev;
 127         len = skb->len;
 128         if (unlikely(netpoll_tx_running(dev)))
 129                 return vlan_netpoll_send_skb(vlan, skb);
 130
 131         ret = dev_queue_xmit(skb);
 132
 133         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 134                 struct vlan_pcpu_stats *stats;
 135
 136                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 137                 u64_stats_update_begin(&stats->syncp);
 138                 stats->tx_packets++;
 139                 stats->tx_bytes += len;
 140                 u64_stats_update_end(&stats->syncp);
 141         } else {
 142                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 143         }
 144
 145         return ret;
 146 }
 147
 148 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 149 {
 150         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 151         unsigned int max_mtu = real_dev->mtu;
 152
 153         if (netif_reduces_vlan_mtu(real_dev))
 154                 max_mtu -= VLAN_HLEN;
 155         if (max_mtu < new_mtu)
 156                 return -ERANGE;
 157
 158         dev->mtu = new_mtu;
 159
 160         return 0;
 161 }
 162
 163 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 164                                    u32 skb_prio, u16 vlan_prio)
 165 {
 166         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 167
 168         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 169                 vlan->nr_ingress_mappings--;
 170         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 171                 vlan->nr_ingress_mappings++;
 172
 173         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 174 }
 175
 176 int vlan_dev_set_egress_priority(const struct net_device *dev,
 177                                  u32 skb_prio, u16 vlan_prio)
 178 {
 179         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 180         struct vlan_priority_tci_mapping *mp = NULL;
 181         struct vlan_priority_tci_mapping *np;
 182         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 183
 184         /* See if a priority mapping exists.. */
 185         mp = vlan->egress_priority_map[skb_prio & 0xF];
 186         while (mp) {
 187                 if (mp->priority == skb_prio) {
 188                         if (mp->vlan_qos && !vlan_qos)
 189                                 vlan->nr_egress_mappings--;
 190                         else if (!mp->vlan_qos && vlan_qos)
 191                                 vlan->nr_egress_mappings++;
 192                         mp->vlan_qos = vlan_qos;
 193                         return 0;
 194                 }
 195                 mp = mp->next;
 196         }
 197
 198         /* Create a new mapping then. */
 199         mp = vlan->egress_priority_map[skb_prio & 0xF];
 200         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 201         if (!np)
 202                 return -ENOBUFS;
 203
 204         np->next = mp;
 205         np->priority = skb_prio;
 206         np->vlan_qos = vlan_qos;
 207         /* Before inserting this element in hash table, make sure all its fields
 208          * are committed to memory.
 209          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 210          */
 211         smp_wmb();
 212         vlan->egress_priority_map[skb_prio & 0xF] = np;
 213         if (vlan_qos)
 214                 vlan->nr_egress_mappings++;
 215         return 0;
 216 }
 217
 218 /* Flags are defined in the vlan_flags enum in
 219  * include/uapi/linux/if_vlan.h file.
 220  */
 221 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 222 {
 223         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 224         u32 old_flags = vlan->flags;
 225
 226         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 227                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 228                 return -EINVAL;
 229
 230         vlan->flags = (old_flags & ~mask) | (flags & mask);
 231
 232         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 233                 if (vlan->flags & VLAN_FLAG_GVRP)
 234                         vlan_gvrp_request_join(dev);
 235                 else
 236                         vlan_gvrp_request_leave(dev);
 237         }
 238
 239         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 240                 if (vlan->flags & VLAN_FLAG_MVRP)
 241                         vlan_mvrp_request_join(dev);
 242                 else
 243                         vlan_mvrp_request_leave(dev);
 244         }
 245         return 0;
 246 }
 247
 248 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 249 {
 250         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 251 }
 252
 253 bool vlan_dev_inherit_address(struct net_device *dev,
 254                               struct net_device *real_dev)
 255 {
 256         if (dev->addr_assign_type != NET_ADDR_STOLEN)
 257                 return false;
 258
 259         ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 260         call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
 261         return true;
 262 }
 263
 264 static int vlan_dev_open(struct net_device *dev)
 265 {
 266         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 267         struct net_device *real_dev = vlan->real_dev;
 268         int err;
 269
 270         if (!(real_dev->flags & IFF_UP) &&
 271             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 272                 return -ENETDOWN;
 273
 274         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
 275             !vlan_dev_inherit_address(dev, real_dev)) {
 276                 err = dev_uc_add(real_dev, dev->dev_addr);
 277                 if (err < 0)
 278                         goto out;
 279         }
 280
 281         if (dev->flags & IFF_ALLMULTI) {
 282                 err = dev_set_allmulti(real_dev, 1);
 283                 if (err < 0)
 284                         goto del_unicast;
 285         }
 286         if (dev->flags & IFF_PROMISC) {
 287                 err = dev_set_promiscuity(real_dev, 1);
 288                 if (err < 0)
 289                         goto clear_allmulti;
 290         }
 291
 292         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 293
 294         if (vlan->flags & VLAN_FLAG_GVRP)
 295                 vlan_gvrp_request_join(dev);
 296
 297         if (vlan->flags & VLAN_FLAG_MVRP)
 298                 vlan_mvrp_request_join(dev);
 299
 300         if (netif_carrier_ok(real_dev))
 301                 netif_carrier_on(dev);
 302         return 0;
 303
 304 clear_allmulti:
 305         if (dev->flags & IFF_ALLMULTI)
 306                 dev_set_allmulti(real_dev, -1);
 307 del_unicast:
 308         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 309                 dev_uc_del(real_dev, dev->dev_addr);
 310 out:
 311         netif_carrier_off(dev);
 312         return err;
 313 }
 314
 315 static int vlan_dev_stop(struct net_device *dev)
 316 {
 317         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 318         struct net_device *real_dev = vlan->real_dev;
 319
 320         dev_mc_unsync(real_dev, dev);
 321         dev_uc_unsync(real_dev, dev);
 322         if (dev->flags & IFF_ALLMULTI)
 323                 dev_set_allmulti(real_dev, -1);
 324         if (dev->flags & IFF_PROMISC)
 325                 dev_set_promiscuity(real_dev, -1);
 326
 327         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 328                 dev_uc_del(real_dev, dev->dev_addr);
 329
 330         netif_carrier_off(dev);
 331         return 0;
 332 }
 333
 334 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 335 {
 336         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 337         struct sockaddr *addr = p;
 338         int err;
 339
 340         if (!is_valid_ether_addr(addr->sa_data))
 341                 return -EADDRNOTAVAIL;
 342
 343         if (!(dev->flags & IFF_UP))
 344                 goto out;
 345
 346         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 347                 err = dev_uc_add(real_dev, addr->sa_data);
 348                 if (err < 0)
 349                         return err;
 350         }
 351
 352         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 353                 dev_uc_del(real_dev, dev->dev_addr);
 354
 355 out:
 356         ether_addr_copy(dev->dev_addr, addr->sa_data);
 357         return 0;
 358 }
 359
 360 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 361 {
 362         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 363         const struct net_device_ops *ops = real_dev->netdev_ops;
 364         struct ifreq ifrr;
 365         int err = -EOPNOTSUPP;
 366
 367         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 368         ifrr.ifr_ifru = ifr->ifr_ifru;
 369
 370         switch (cmd) {
 371         case SIOCSHWTSTAMP:
 372                 if (!net_eq(dev_net(dev), &init_net))
 373                         break;
 374         case SIOCGMIIPHY:
 375         case SIOCGMIIREG:
 376         case SIOCSMIIREG:
 377         case SIOCGHWTSTAMP:
 378                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 379                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 380                 break;
 381         }
 382
 383         if (!err)
 384                 ifr->ifr_ifru = ifrr.ifr_ifru;
 385
 386         return err;
 387 }
 388
 389 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 390 {
 391         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 392         const struct net_device_ops *ops = real_dev->netdev_ops;
 393         int err = 0;
 394
 395         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 396                 err = ops->ndo_neigh_setup(real_dev, pa);
 397
 398         return err;
 399 }
 400
 401 #if IS_ENABLED(CONFIG_FCOE)
 402 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 403                                    struct scatterlist *sgl, unsigned int sgc)
 404 {
 405         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 406         const struct net_device_ops *ops = real_dev->netdev_ops;
 407         int rc = 0;
 408
 409         if (ops->ndo_fcoe_ddp_setup)
 410                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 411
 412         return rc;
 413 }
 414
 415 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 416 {
 417         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 418         const struct net_device_ops *ops = real_dev->netdev_ops;
 419         int len = 0;
 420
 421         if (ops->ndo_fcoe_ddp_done)
 422                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 423
 424         return len;
 425 }
 426
 427 static int vlan_dev_fcoe_enable(struct net_device *dev)
 428 {
 429         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 430         const struct net_device_ops *ops = real_dev->netdev_ops;
 431         int rc = -EINVAL;
 432
 433         if (ops->ndo_fcoe_enable)
 434                 rc = ops->ndo_fcoe_enable(real_dev);
 435         return rc;
 436 }
 437
 438 static int vlan_dev_fcoe_disable(struct net_device *dev)
 439 {
 440         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 441         const struct net_device_ops *ops = real_dev->netdev_ops;
 442         int rc = -EINVAL;
 443
 444         if (ops->ndo_fcoe_disable)
 445                 rc = ops->ndo_fcoe_disable(real_dev);
 446         return rc;
 447 }
 448
 449 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 450 {
 451         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 452         const struct net_device_ops *ops = real_dev->netdev_ops;
 453         int rc = -EINVAL;
 454
 455         if (ops->ndo_fcoe_get_wwn)
 456                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 457         return rc;
 458 }
 459
 460 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 461                                     struct scatterlist *sgl, unsigned int sgc)
 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 = 0;
 466
 467         if (ops->ndo_fcoe_ddp_target)
 468                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 469
 470         return rc;
 471 }
 472 #endif
 473
 474 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 475 {
 476         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 477
 478         if (dev->flags & IFF_UP) {
 479                 if (change & IFF_ALLMULTI)
 480                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 481                 if (change & IFF_PROMISC)
 482                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 483         }
 484 }
 485
 486 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 487 {
 488         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 489         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 490 }
 491
 492 /*
 493  * vlan network devices have devices nesting below it, and are a special
 494  * "super class" of normal network devices; split their locks off into a
 495  * separate class since they always nest.
 496  */
 497 static struct lock_class_key vlan_netdev_xmit_lock_key;
 498 static struct lock_class_key vlan_netdev_addr_lock_key;
 499
 500 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 501                                      struct netdev_queue *txq,
 502                                      void *_subclass)
 503 {
 504         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 505                                        &vlan_netdev_xmit_lock_key,
 506                                        *(int *)_subclass);
 507 }
 508
 509 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 510 {
 511         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 512                                        &vlan_netdev_addr_lock_key,
 513                                        subclass);
 514         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 515 }
 516
 517 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 518 {
 519         return vlan_dev_priv(dev)->nest_level;
 520 }
 521
 522 static const struct header_ops vlan_header_ops = {
 523         .create  = vlan_dev_hard_header,
 524         .parse   = eth_header_parse,
 525 };
 526
 527 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 528                                      unsigned short type,
 529                                      const void *daddr, const void *saddr,
 530                                      unsigned int len)
 531 {
 532         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 533         struct net_device *real_dev = vlan->real_dev;
 534
 535         if (saddr == NULL)
 536                 saddr = dev->dev_addr;
 537
 538         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 539 }
 540
 541 static const struct header_ops vlan_passthru_header_ops = {
 542         .create  = vlan_passthru_hard_header,
 543         .parse   = eth_header_parse,
 544 };
 545
 546 static struct device_type vlan_type = {
 547         .name   = "vlan",
 548 };
 549
 550 static const struct net_device_ops vlan_netdev_ops;
 551
 552 static int vlan_dev_init(struct net_device *dev)
 553 {
 554         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 555
 556         netif_carrier_off(dev);
 557
 558         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 559         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 560                                           IFF_MASTER | IFF_SLAVE);
 561         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 562                                           (1<<__LINK_STATE_DORMANT))) |
 563                       (1<<__LINK_STATE_PRESENT);
 564
 565         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 566                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 567                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 568                            NETIF_F_ALL_FCOE;
 569
 570         dev->features |= dev->hw_features | NETIF_F_LLTX;
 571         dev->gso_max_size = real_dev->gso_max_size;
 572         dev->gso_max_segs = real_dev->gso_max_segs;
 573         if (dev->features & NETIF_F_VLAN_FEATURES)
 574                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 575
 576         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 577
 578         /* ipv6 shared card related stuff */
 579         dev->dev_id = real_dev->dev_id;
 580
 581         if (is_zero_ether_addr(dev->dev_addr)) {
 582                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 583                 dev->addr_assign_type = NET_ADDR_STOLEN;
 584         }
 585         if (is_zero_ether_addr(dev->broadcast))
 586                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 587
 588 #if IS_ENABLED(CONFIG_FCOE)
 589         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 590 #endif
 591
 592         dev->needed_headroom = real_dev->needed_headroom;
 593         if (vlan_hw_offload_capable(real_dev->features,
 594                                     vlan_dev_priv(dev)->vlan_proto)) {
 595                 dev->header_ops      = &vlan_passthru_header_ops;
 596                 dev->hard_header_len = real_dev->hard_header_len;
 597         } else {
 598                 dev->header_ops      = &vlan_header_ops;
 599                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 600         }
 601
 602         dev->netdev_ops = &vlan_netdev_ops;
 603
 604         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 605
 606         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 607
 608         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 609         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 610                 return -ENOMEM;
 611
 612         return 0;
 613 }
 614
 615 /* Note: this function might be called multiple times for the same device. */
 616 void vlan_dev_uninit(struct net_device *dev)
 617 {
 618         struct vlan_priority_tci_mapping *pm;
 619         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 620         int i;
 621
 622         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 623                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 624                         vlan->egress_priority_map[i] = pm->next;
 625                         kfree(pm);
 626                 }
 627         }
 628 }
 629
 630 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 631         netdev_features_t features)
 632 {
 633         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 634         netdev_features_t old_features = features;
 635         netdev_features_t lower_features;
 636
 637         lower_features = netdev_intersect_features((real_dev->vlan_features |
 638                                                     NETIF_F_RXCSUM),
 639                                                    real_dev->features);
 640
 641         /* Add HW_CSUM setting to preserve user ability to control
 642          * checksum offload on the vlan device.
 643          */
 644         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 645                 lower_features |= NETIF_F_HW_CSUM;
 646         features = netdev_intersect_features(features, lower_features);
 647         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 648         features |= NETIF_F_LLTX;
 649
 650         return features;
 651 }
 652
 653 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 654                                            struct ethtool_link_ksettings *cmd)
 655 {
 656         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 657
 658         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 659 }
 660
 661 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 662                                      struct ethtool_drvinfo *info)
 663 {
 664         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 665         strlcpy(info->version, vlan_version, sizeof(info->version));
 666         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 667 }
 668
 669 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 670                                     struct ethtool_ts_info *info)
 671 {
 672         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 673         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 674         struct phy_device *phydev = vlan->real_dev->phydev;
 675
 676         if (phydev && phydev->drv && phydev->drv->ts_info) {
 677                  return phydev->drv->ts_info(phydev, info);
 678         } else if (ops->get_ts_info) {
 679                 return ops->get_ts_info(vlan->real_dev, info);
 680         } else {
 681                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 682                         SOF_TIMESTAMPING_SOFTWARE;
 683                 info->phc_index = -1;
 684         }
 685
 686         return 0;
 687 }
 688
 689 static void vlan_dev_get_stats64(struct net_device *dev,
 690                                  struct rtnl_link_stats64 *stats)
 691 {
 692         struct vlan_pcpu_stats *p;
 693         u32 rx_errors = 0, tx_dropped = 0;
 694         int i;
 695
 696         for_each_possible_cpu(i) {
 697                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 698                 unsigned int start;
 699
 700                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 701                 do {
 702                         start = u64_stats_fetch_begin_irq(&p->syncp);
 703                         rxpackets       = p->rx_packets;
 704                         rxbytes         = p->rx_bytes;
 705                         rxmulticast     = p->rx_multicast;
 706                         txpackets       = p->tx_packets;
 707                         txbytes         = p->tx_bytes;
 708                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 709
 710                 stats->rx_packets       += rxpackets;
 711                 stats->rx_bytes         += rxbytes;
 712                 stats->multicast        += rxmulticast;
 713                 stats->tx_packets       += txpackets;
 714                 stats->tx_bytes         += txbytes;
 715                 /* rx_errors & tx_dropped are u32 */
 716                 rx_errors       += p->rx_errors;
 717                 tx_dropped      += p->tx_dropped;
 718         }
 719         stats->rx_errors  = rx_errors;
 720         stats->tx_dropped = tx_dropped;
 721 }
 722
 723 #ifdef CONFIG_NET_POLL_CONTROLLER
 724 static void vlan_dev_poll_controller(struct net_device *dev)
 725 {
 726         return;
 727 }
 728
 729 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 730 {
 731         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 732         struct net_device *real_dev = vlan->real_dev;
 733         struct netpoll *netpoll;
 734         int err = 0;
 735
 736         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 737         err = -ENOMEM;
 738         if (!netpoll)
 739                 goto out;
 740
 741         err = __netpoll_setup(netpoll, real_dev);
 742         if (err) {
 743                 kfree(netpoll);
 744                 goto out;
 745         }
 746
 747         vlan->netpoll = netpoll;
 748
 749 out:
 750         return err;
 751 }
 752
 753 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 754 {
 755         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 756         struct netpoll *netpoll = vlan->netpoll;
 757
 758         if (!netpoll)
 759                 return;
 760
 761         vlan->netpoll = NULL;
 762
 763         __netpoll_free_async(netpoll);
 764 }
 765 #endif /* CONFIG_NET_POLL_CONTROLLER */
 766
 767 static int vlan_dev_get_iflink(const struct net_device *dev)
 768 {
 769         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 770
 771         return real_dev->ifindex;
 772 }
 773
 774 static const struct ethtool_ops vlan_ethtool_ops = {
 775         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 776         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 777         .get_link               = ethtool_op_get_link,
 778         .get_ts_info            = vlan_ethtool_get_ts_info,
 779 };
 780
 781 static const struct net_device_ops vlan_netdev_ops = {
 782         .ndo_change_mtu         = vlan_dev_change_mtu,
 783         .ndo_init               = vlan_dev_init,
 784         .ndo_uninit             = vlan_dev_uninit,
 785         .ndo_open               = vlan_dev_open,
 786         .ndo_stop               = vlan_dev_stop,
 787         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 788         .ndo_validate_addr      = eth_validate_addr,
 789         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 790         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 791         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 792         .ndo_do_ioctl           = vlan_dev_ioctl,
 793         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 794         .ndo_get_stats64        = vlan_dev_get_stats64,
 795 #if IS_ENABLED(CONFIG_FCOE)
 796         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 797         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 798         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 799         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 800         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 801         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 802 #endif
 803 #ifdef CONFIG_NET_POLL_CONTROLLER
 804         .ndo_poll_controller    = vlan_dev_poll_controller,
 805         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 806         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 807 #endif
 808         .ndo_fix_features       = vlan_dev_fix_features,
 809         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 810         .ndo_get_iflink         = vlan_dev_get_iflink,
 811 };
 812
 813 static void vlan_dev_free(struct net_device *dev)
 814 {
 815         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 816
 817         free_percpu(vlan->vlan_pcpu_stats);
 818         vlan->vlan_pcpu_stats = NULL;
 819 }
 820
 821 void vlan_setup(struct net_device *dev)
 822 {
 823         ether_setup(dev);
 824
 825         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 826         dev->priv_flags         |= IFF_UNICAST_FLT;
 827         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 828         netif_keep_dst(dev);
 829
 830         dev->netdev_ops         = &vlan_netdev_ops;
 831         dev->needs_free_netdev  = true;
 832         dev->priv_destructor    = vlan_dev_free;
 833         dev->ethtool_ops        = &vlan_ethtool_ops;
 834
 835         dev->min_mtu            = 0;
 836         dev->max_mtu            = ETH_MAX_MTU;
 837
 838         eth_zero_addr(dev->broadcast);
 839 }