net/8021q/vlan_dev.c

   1 /* -*- linux-c -*-
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <[email protected]>
   6  *              Please send support related email to: [email protected]
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:       Mar 22 2001: Martin Bokaemper <[email protected]>
  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 SIOCGMIIPHY:
 372         case SIOCGMIIREG:
 373         case SIOCSMIIREG:
 374         case SIOCSHWTSTAMP:
 375         case SIOCGHWTSTAMP:
 376                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 377                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 378                 break;
 379         }
 380
 381         if (!err)
 382                 ifr->ifr_ifru = ifrr.ifr_ifru;
 383
 384         return err;
 385 }
 386
 387 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 388 {
 389         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 390         const struct net_device_ops *ops = real_dev->netdev_ops;
 391         int err = 0;
 392
 393         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 394                 err = ops->ndo_neigh_setup(real_dev, pa);
 395
 396         return err;
 397 }
 398
 399 #if IS_ENABLED(CONFIG_FCOE)
 400 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 401                                    struct scatterlist *sgl, unsigned int sgc)
 402 {
 403         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 404         const struct net_device_ops *ops = real_dev->netdev_ops;
 405         int rc = 0;
 406
 407         if (ops->ndo_fcoe_ddp_setup)
 408                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 409
 410         return rc;
 411 }
 412
 413 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 414 {
 415         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 416         const struct net_device_ops *ops = real_dev->netdev_ops;
 417         int len = 0;
 418
 419         if (ops->ndo_fcoe_ddp_done)
 420                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 421
 422         return len;
 423 }
 424
 425 static int vlan_dev_fcoe_enable(struct net_device *dev)
 426 {
 427         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 428         const struct net_device_ops *ops = real_dev->netdev_ops;
 429         int rc = -EINVAL;
 430
 431         if (ops->ndo_fcoe_enable)
 432                 rc = ops->ndo_fcoe_enable(real_dev);
 433         return rc;
 434 }
 435
 436 static int vlan_dev_fcoe_disable(struct net_device *dev)
 437 {
 438         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 439         const struct net_device_ops *ops = real_dev->netdev_ops;
 440         int rc = -EINVAL;
 441
 442         if (ops->ndo_fcoe_disable)
 443                 rc = ops->ndo_fcoe_disable(real_dev);
 444         return rc;
 445 }
 446
 447 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 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 = -EINVAL;
 452
 453         if (ops->ndo_fcoe_get_wwn)
 454                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 455         return rc;
 456 }
 457
 458 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 459                                     struct scatterlist *sgl, unsigned int sgc)
 460 {
 461         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 462         const struct net_device_ops *ops = real_dev->netdev_ops;
 463         int rc = 0;
 464
 465         if (ops->ndo_fcoe_ddp_target)
 466                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 467
 468         return rc;
 469 }
 470 #endif
 471
 472 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 473 {
 474         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 475
 476         if (dev->flags & IFF_UP) {
 477                 if (change & IFF_ALLMULTI)
 478                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 479                 if (change & IFF_PROMISC)
 480                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 481         }
 482 }
 483
 484 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 485 {
 486         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 487         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 488 }
 489
 490 /*
 491  * vlan network devices have devices nesting below it, and are a special
 492  * "super class" of normal network devices; split their locks off into a
 493  * separate class since they always nest.
 494  */
 495 static struct lock_class_key vlan_netdev_xmit_lock_key;
 496 static struct lock_class_key vlan_netdev_addr_lock_key;
 497
 498 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 499                                      struct netdev_queue *txq,
 500                                      void *_subclass)
 501 {
 502         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 503                                        &vlan_netdev_xmit_lock_key,
 504                                        *(int *)_subclass);
 505 }
 506
 507 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 508 {
 509         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 510                                        &vlan_netdev_addr_lock_key,
 511                                        subclass);
 512         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 513 }
 514
 515 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 516 {
 517         return vlan_dev_priv(dev)->nest_level;
 518 }
 519
 520 static const struct header_ops vlan_header_ops = {
 521         .create  = vlan_dev_hard_header,
 522         .parse   = eth_header_parse,
 523 };
 524
 525 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 526                                      unsigned short type,
 527                                      const void *daddr, const void *saddr,
 528                                      unsigned int len)
 529 {
 530         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 531         struct net_device *real_dev = vlan->real_dev;
 532
 533         if (saddr == NULL)
 534                 saddr = dev->dev_addr;
 535
 536         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 537 }
 538
 539 static const struct header_ops vlan_passthru_header_ops = {
 540         .create  = vlan_passthru_hard_header,
 541         .parse   = eth_header_parse,
 542 };
 543
 544 static struct device_type vlan_type = {
 545         .name   = "vlan",
 546 };
 547
 548 static const struct net_device_ops vlan_netdev_ops;
 549
 550 static int vlan_dev_init(struct net_device *dev)
 551 {
 552         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 553
 554         netif_carrier_off(dev);
 555
 556         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 557         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 558                                           IFF_MASTER | IFF_SLAVE);
 559         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 560                                           (1<<__LINK_STATE_DORMANT))) |
 561                       (1<<__LINK_STATE_PRESENT);
 562
 563         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 564                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 565                            NETIF_F_GSO_ENCAP_ALL |
 566                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 567                            NETIF_F_ALL_FCOE;
 568
 569         dev->features |= dev->hw_features | NETIF_F_LLTX;
 570         dev->gso_max_size = real_dev->gso_max_size;
 571         dev->gso_max_segs = real_dev->gso_max_segs;
 572         if (dev->features & NETIF_F_VLAN_FEATURES)
 573                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 574
 575         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 576         dev->hw_enc_features = vlan_tnl_features(real_dev);
 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 static void vlan_dev_uninit(struct net_device *dev)
 616 {
 617         struct vlan_priority_tci_mapping *pm;
 618         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 619         int i;
 620
 621         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 622                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 623                         vlan->egress_priority_map[i] = pm->next;
 624                         kfree(pm);
 625                 }
 626         }
 627 }
 628
 629 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 630         netdev_features_t features)
 631 {
 632         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 633         netdev_features_t old_features = features;
 634         netdev_features_t lower_features;
 635
 636         lower_features = netdev_intersect_features((real_dev->vlan_features |
 637                                                     NETIF_F_RXCSUM),
 638                                                    real_dev->features);
 639
 640         /* Add HW_CSUM setting to preserve user ability to control
 641          * checksum offload on the vlan device.
 642          */
 643         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 644                 lower_features |= NETIF_F_HW_CSUM;
 645         features = netdev_intersect_features(features, lower_features);
 646         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 647         features |= NETIF_F_LLTX;
 648
 649         return features;
 650 }
 651
 652 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 653                                            struct ethtool_link_ksettings *cmd)
 654 {
 655         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 656
 657         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 658 }
 659
 660 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 661                                      struct ethtool_drvinfo *info)
 662 {
 663         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 664         strlcpy(info->version, vlan_version, sizeof(info->version));
 665         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 666 }
 667
 668 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 669                                     struct ethtool_ts_info *info)
 670 {
 671         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 672         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 673         struct phy_device *phydev = vlan->real_dev->phydev;
 674
 675         if (phydev && phydev->drv && phydev->drv->ts_info) {
 676                  return phydev->drv->ts_info(phydev, info);
 677         } else if (ops->get_ts_info) {
 678                 return ops->get_ts_info(vlan->real_dev, info);
 679         } else {
 680                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 681                         SOF_TIMESTAMPING_SOFTWARE;
 682                 info->phc_index = -1;
 683         }
 684
 685         return 0;
 686 }
 687
 688 static void vlan_dev_get_stats64(struct net_device *dev,
 689                                  struct rtnl_link_stats64 *stats)
 690 {
 691         struct vlan_pcpu_stats *p;
 692         u32 rx_errors = 0, tx_dropped = 0;
 693         int i;
 694
 695         for_each_possible_cpu(i) {
 696                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 697                 unsigned int start;
 698
 699                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 700                 do {
 701                         start = u64_stats_fetch_begin_irq(&p->syncp);
 702                         rxpackets       = p->rx_packets;
 703                         rxbytes         = p->rx_bytes;
 704                         rxmulticast     = p->rx_multicast;
 705                         txpackets       = p->tx_packets;
 706                         txbytes         = p->tx_bytes;
 707                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 708
 709                 stats->rx_packets       += rxpackets;
 710                 stats->rx_bytes         += rxbytes;
 711                 stats->multicast        += rxmulticast;
 712                 stats->tx_packets       += txpackets;
 713                 stats->tx_bytes         += txbytes;
 714                 /* rx_errors & tx_dropped are u32 */
 715                 rx_errors       += p->rx_errors;
 716                 tx_dropped      += p->tx_dropped;
 717         }
 718         stats->rx_errors  = rx_errors;
 719         stats->tx_dropped = tx_dropped;
 720 }
 721
 722 #ifdef CONFIG_NET_POLL_CONTROLLER
 723 static void vlan_dev_poll_controller(struct net_device *dev)
 724 {
 725         return;
 726 }
 727
 728 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 729 {
 730         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 731         struct net_device *real_dev = vlan->real_dev;
 732         struct netpoll *netpoll;
 733         int err = 0;
 734
 735         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 736         err = -ENOMEM;
 737         if (!netpoll)
 738                 goto out;
 739
 740         err = __netpoll_setup(netpoll, real_dev);
 741         if (err) {
 742                 kfree(netpoll);
 743                 goto out;
 744         }
 745
 746         vlan->netpoll = netpoll;
 747
 748 out:
 749         return err;
 750 }
 751
 752 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 753 {
 754         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 755         struct netpoll *netpoll = vlan->netpoll;
 756
 757         if (!netpoll)
 758                 return;
 759
 760         vlan->netpoll = NULL;
 761         __netpoll_free(netpoll);
 762 }
 763 #endif /* CONFIG_NET_POLL_CONTROLLER */
 764
 765 static int vlan_dev_get_iflink(const struct net_device *dev)
 766 {
 767         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 768
 769         return real_dev->ifindex;
 770 }
 771
 772 static const struct ethtool_ops vlan_ethtool_ops = {
 773         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 774         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 775         .get_link               = ethtool_op_get_link,
 776         .get_ts_info            = vlan_ethtool_get_ts_info,
 777 };
 778
 779 static const struct net_device_ops vlan_netdev_ops = {
 780         .ndo_change_mtu         = vlan_dev_change_mtu,
 781         .ndo_init               = vlan_dev_init,
 782         .ndo_uninit             = vlan_dev_uninit,
 783         .ndo_open               = vlan_dev_open,
 784         .ndo_stop               = vlan_dev_stop,
 785         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 786         .ndo_validate_addr      = eth_validate_addr,
 787         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 788         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 789         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 790         .ndo_do_ioctl           = vlan_dev_ioctl,
 791         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 792         .ndo_get_stats64        = vlan_dev_get_stats64,
 793 #if IS_ENABLED(CONFIG_FCOE)
 794         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 795         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 796         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 797         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 798         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 799         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 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_lock_subclass  = vlan_dev_get_lock_subclass,
 808         .ndo_get_iflink         = vlan_dev_get_iflink,
 809 };
 810
 811 static void vlan_dev_free(struct net_device *dev)
 812 {
 813         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 814
 815         free_percpu(vlan->vlan_pcpu_stats);
 816         vlan->vlan_pcpu_stats = NULL;
 817 }
 818
 819 void vlan_setup(struct net_device *dev)
 820 {
 821         ether_setup(dev);
 822
 823         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 824         dev->priv_flags         |= IFF_UNICAST_FLT;
 825         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 826         netif_keep_dst(dev);
 827
 828         dev->netdev_ops         = &vlan_netdev_ops;
 829         dev->needs_free_netdev  = true;
 830         dev->priv_destructor    = vlan_dev_free;
 831         dev->ethtool_ops        = &vlan_ethtool_ops;
 832
 833         dev->min_mtu            = 0;
 834         dev->max_mtu            = ETH_MAX_MTU;
 835
 836         eth_zero_addr(dev->broadcast);
 837 }