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
  35 #include "vlan.h"
  36 #include "vlanproc.h"
  37 #include <linux/if_vlan.h>
  38 #include <linux/netpoll.h>
  39
  40 /*
  41  *      Create the VLAN header for an arbitrary protocol layer
  42  *
  43  *      saddr=NULL      means use device source address
  44  *      daddr=NULL      means leave destination address (eg unresolved arp)
  45  *
  46  *  This is called when the SKB is moving down the stack towards the
  47  *  physical devices.
  48  */
  49 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  50                                 unsigned short type,
  51                                 const void *daddr, const void *saddr,
  52                                 unsigned int len)
  53 {
  54         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  55         struct vlan_hdr *vhdr;
  56         unsigned int vhdrlen = 0;
  57         u16 vlan_tci = 0;
  58         int rc;
  59
  60         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  61                 vhdr = skb_push(skb, VLAN_HLEN);
  62
  63                 vlan_tci = vlan->vlan_id;
  64                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  65                 vhdr->h_vlan_TCI = htons(vlan_tci);
  66
  67                 /*
  68                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
  69                  *  put the length in here instead.
  70                  */
  71                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
  72                         vhdr->h_vlan_encapsulated_proto = htons(type);
  73                 else
  74                         vhdr->h_vlan_encapsulated_proto = htons(len);
  75
  76                 skb->protocol = vlan->vlan_proto;
  77                 type = ntohs(vlan->vlan_proto);
  78                 vhdrlen = VLAN_HLEN;
  79         }
  80
  81         /* Before delegating work to the lower layer, enter our MAC-address */
  82         if (saddr == NULL)
  83                 saddr = dev->dev_addr;
  84
  85         /* Now make the underlying real hard header */
  86         dev = vlan->real_dev;
  87         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
  88         if (rc > 0)
  89                 rc += vhdrlen;
  90         return rc;
  91 }
  92
  93 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
  94 {
  95 #ifdef CONFIG_NET_POLL_CONTROLLER
  96         if (vlan->netpoll)
  97                 netpoll_send_skb(vlan->netpoll, skb);
  98 #else
  99         BUG();
 100 #endif
 101         return NETDEV_TX_OK;
 102 }
 103
 104 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 105                                             struct net_device *dev)
 106 {
 107         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 108         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 109         unsigned int len;
 110         int ret;
 111
 112         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 113          *
 114          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 115          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 116          */
 117         if (veth->h_vlan_proto != vlan->vlan_proto ||
 118             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 119                 u16 vlan_tci;
 120                 vlan_tci = vlan->vlan_id;
 121                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 122                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 123         }
 124
 125         skb->dev = vlan->real_dev;
 126         len = skb->len;
 127         if (unlikely(netpoll_tx_running(dev)))
 128                 return vlan_netpoll_send_skb(vlan, skb);
 129
 130         ret = dev_queue_xmit(skb);
 131
 132         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 133                 struct vlan_pcpu_stats *stats;
 134
 135                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 136                 u64_stats_update_begin(&stats->syncp);
 137                 stats->tx_packets++;
 138                 stats->tx_bytes += len;
 139                 u64_stats_update_end(&stats->syncp);
 140         } else {
 141                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 142         }
 143
 144         return ret;
 145 }
 146
 147 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 148 {
 149         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 150         unsigned int max_mtu = real_dev->mtu;
 151
 152         if (netif_reduces_vlan_mtu(real_dev))
 153                 max_mtu -= VLAN_HLEN;
 154         if (max_mtu < new_mtu)
 155                 return -ERANGE;
 156
 157         dev->mtu = new_mtu;
 158
 159         return 0;
 160 }
 161
 162 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 163                                    u32 skb_prio, u16 vlan_prio)
 164 {
 165         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 166
 167         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 168                 vlan->nr_ingress_mappings--;
 169         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 170                 vlan->nr_ingress_mappings++;
 171
 172         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 173 }
 174
 175 int vlan_dev_set_egress_priority(const struct net_device *dev,
 176                                  u32 skb_prio, u16 vlan_prio)
 177 {
 178         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 179         struct vlan_priority_tci_mapping *mp = NULL;
 180         struct vlan_priority_tci_mapping *np;
 181         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 182
 183         /* See if a priority mapping exists.. */
 184         mp = vlan->egress_priority_map[skb_prio & 0xF];
 185         while (mp) {
 186                 if (mp->priority == skb_prio) {
 187                         if (mp->vlan_qos && !vlan_qos)
 188                                 vlan->nr_egress_mappings--;
 189                         else if (!mp->vlan_qos && vlan_qos)
 190                                 vlan->nr_egress_mappings++;
 191                         mp->vlan_qos = vlan_qos;
 192                         return 0;
 193                 }
 194                 mp = mp->next;
 195         }
 196
 197         /* Create a new mapping then. */
 198         mp = vlan->egress_priority_map[skb_prio & 0xF];
 199         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 200         if (!np)
 201                 return -ENOBUFS;
 202
 203         np->next = mp;
 204         np->priority = skb_prio;
 205         np->vlan_qos = vlan_qos;
 206         /* Before inserting this element in hash table, make sure all its fields
 207          * are committed to memory.
 208          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 209          */
 210         smp_wmb();
 211         vlan->egress_priority_map[skb_prio & 0xF] = np;
 212         if (vlan_qos)
 213                 vlan->nr_egress_mappings++;
 214         return 0;
 215 }
 216
 217 /* Flags are defined in the vlan_flags enum in
 218  * include/uapi/linux/if_vlan.h file.
 219  */
 220 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 221 {
 222         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 223         u32 old_flags = vlan->flags;
 224
 225         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 226                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
 227                      VLAN_FLAG_BRIDGE_BINDING))
 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             !(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 302                 netif_carrier_on(dev);
 303         return 0;
 304
 305 clear_allmulti:
 306         if (dev->flags & IFF_ALLMULTI)
 307                 dev_set_allmulti(real_dev, -1);
 308 del_unicast:
 309         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 310                 dev_uc_del(real_dev, dev->dev_addr);
 311 out:
 312         netif_carrier_off(dev);
 313         return err;
 314 }
 315
 316 static int vlan_dev_stop(struct net_device *dev)
 317 {
 318         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 319         struct net_device *real_dev = vlan->real_dev;
 320
 321         dev_mc_unsync(real_dev, dev);
 322         dev_uc_unsync(real_dev, dev);
 323         if (dev->flags & IFF_ALLMULTI)
 324                 dev_set_allmulti(real_dev, -1);
 325         if (dev->flags & IFF_PROMISC)
 326                 dev_set_promiscuity(real_dev, -1);
 327
 328         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 329                 dev_uc_del(real_dev, dev->dev_addr);
 330
 331         if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
 332                 netif_carrier_off(dev);
 333         return 0;
 334 }
 335
 336 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 337 {
 338         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 339         struct sockaddr *addr = p;
 340         int err;
 341
 342         if (!is_valid_ether_addr(addr->sa_data))
 343                 return -EADDRNOTAVAIL;
 344
 345         if (!(dev->flags & IFF_UP))
 346                 goto out;
 347
 348         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 349                 err = dev_uc_add(real_dev, addr->sa_data);
 350                 if (err < 0)
 351                         return err;
 352         }
 353
 354         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 355                 dev_uc_del(real_dev, dev->dev_addr);
 356
 357 out:
 358         ether_addr_copy(dev->dev_addr, addr->sa_data);
 359         return 0;
 360 }
 361
 362 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 363 {
 364         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 365         const struct net_device_ops *ops = real_dev->netdev_ops;
 366         struct ifreq ifrr;
 367         int err = -EOPNOTSUPP;
 368
 369         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 370         ifrr.ifr_ifru = ifr->ifr_ifru;
 371
 372         switch (cmd) {
 373         case SIOCSHWTSTAMP:
 374                 if (!net_eq(dev_net(dev), &init_net))
 375                         break;
 376         case SIOCGMIIPHY:
 377         case SIOCGMIIREG:
 378         case SIOCSMIIREG:
 379         case SIOCGHWTSTAMP:
 380                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 381                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 382                 break;
 383         }
 384
 385         if (!err)
 386                 ifr->ifr_ifru = ifrr.ifr_ifru;
 387
 388         return err;
 389 }
 390
 391 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 392 {
 393         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 394         const struct net_device_ops *ops = real_dev->netdev_ops;
 395         int err = 0;
 396
 397         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 398                 err = ops->ndo_neigh_setup(real_dev, pa);
 399
 400         return err;
 401 }
 402
 403 #if IS_ENABLED(CONFIG_FCOE)
 404 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 405                                    struct scatterlist *sgl, unsigned int sgc)
 406 {
 407         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 408         const struct net_device_ops *ops = real_dev->netdev_ops;
 409         int rc = 0;
 410
 411         if (ops->ndo_fcoe_ddp_setup)
 412                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 413
 414         return rc;
 415 }
 416
 417 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 418 {
 419         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 420         const struct net_device_ops *ops = real_dev->netdev_ops;
 421         int len = 0;
 422
 423         if (ops->ndo_fcoe_ddp_done)
 424                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 425
 426         return len;
 427 }
 428
 429 static int vlan_dev_fcoe_enable(struct net_device *dev)
 430 {
 431         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 432         const struct net_device_ops *ops = real_dev->netdev_ops;
 433         int rc = -EINVAL;
 434
 435         if (ops->ndo_fcoe_enable)
 436                 rc = ops->ndo_fcoe_enable(real_dev);
 437         return rc;
 438 }
 439
 440 static int vlan_dev_fcoe_disable(struct net_device *dev)
 441 {
 442         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 443         const struct net_device_ops *ops = real_dev->netdev_ops;
 444         int rc = -EINVAL;
 445
 446         if (ops->ndo_fcoe_disable)
 447                 rc = ops->ndo_fcoe_disable(real_dev);
 448         return rc;
 449 }
 450
 451 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 452                                     struct scatterlist *sgl, unsigned int sgc)
 453 {
 454         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 455         const struct net_device_ops *ops = real_dev->netdev_ops;
 456         int rc = 0;
 457
 458         if (ops->ndo_fcoe_ddp_target)
 459                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 460
 461         return rc;
 462 }
 463 #endif
 464
 465 #ifdef NETDEV_FCOE_WWNN
 466 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 467 {
 468         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 469         const struct net_device_ops *ops = real_dev->netdev_ops;
 470         int rc = -EINVAL;
 471
 472         if (ops->ndo_fcoe_get_wwn)
 473                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 474         return rc;
 475 }
 476 #endif
 477
 478 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 479 {
 480         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 481
 482         if (dev->flags & IFF_UP) {
 483                 if (change & IFF_ALLMULTI)
 484                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 485                 if (change & IFF_PROMISC)
 486                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 487         }
 488 }
 489
 490 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 491 {
 492         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 493         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 494 }
 495
 496 /*
 497  * vlan network devices have devices nesting below it, and are a special
 498  * "super class" of normal network devices; split their locks off into a
 499  * separate class since they always nest.
 500  */
 501 static struct lock_class_key vlan_netdev_xmit_lock_key;
 502 static struct lock_class_key vlan_netdev_addr_lock_key;
 503
 504 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 505                                      struct netdev_queue *txq,
 506                                      void *_subclass)
 507 {
 508         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 509                                        &vlan_netdev_xmit_lock_key,
 510                                        *(int *)_subclass);
 511 }
 512
 513 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 514 {
 515         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 516                                        &vlan_netdev_addr_lock_key,
 517                                        subclass);
 518         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 519 }
 520
 521 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 522 {
 523         return vlan_dev_priv(dev)->nest_level;
 524 }
 525
 526 static const struct header_ops vlan_header_ops = {
 527         .create  = vlan_dev_hard_header,
 528         .parse   = eth_header_parse,
 529 };
 530
 531 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 532                                      unsigned short type,
 533                                      const void *daddr, const void *saddr,
 534                                      unsigned int len)
 535 {
 536         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 537         struct net_device *real_dev = vlan->real_dev;
 538
 539         if (saddr == NULL)
 540                 saddr = dev->dev_addr;
 541
 542         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 543 }
 544
 545 static const struct header_ops vlan_passthru_header_ops = {
 546         .create  = vlan_passthru_hard_header,
 547         .parse   = eth_header_parse,
 548 };
 549
 550 static struct device_type vlan_type = {
 551         .name   = "vlan",
 552 };
 553
 554 static const struct net_device_ops vlan_netdev_ops;
 555
 556 static int vlan_dev_init(struct net_device *dev)
 557 {
 558         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 559         struct net_device *real_dev = vlan->real_dev;
 560
 561         netif_carrier_off(dev);
 562
 563         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 564         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 565                                           IFF_MASTER | IFF_SLAVE);
 566         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 567                                           (1<<__LINK_STATE_DORMANT))) |
 568                       (1<<__LINK_STATE_PRESENT);
 569
 570         if (vlan->flags & VLAN_FLAG_BRIDGE_BINDING)
 571                 dev->state |= (1 << __LINK_STATE_NOCARRIER);
 572
 573         dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG |
 574                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 575                            NETIF_F_GSO_ENCAP_ALL |
 576                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CRC |
 577                            NETIF_F_ALL_FCOE;
 578
 579         dev->features |= dev->hw_features | NETIF_F_LLTX;
 580         dev->gso_max_size = real_dev->gso_max_size;
 581         dev->gso_max_segs = real_dev->gso_max_segs;
 582         if (dev->features & NETIF_F_VLAN_FEATURES)
 583                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 584
 585         dev->vlan_features = real_dev->vlan_features & ~NETIF_F_ALL_FCOE;
 586         dev->hw_enc_features = vlan_tnl_features(real_dev);
 587
 588         /* ipv6 shared card related stuff */
 589         dev->dev_id = real_dev->dev_id;
 590
 591         if (is_zero_ether_addr(dev->dev_addr)) {
 592                 ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
 593                 dev->addr_assign_type = NET_ADDR_STOLEN;
 594         }
 595         if (is_zero_ether_addr(dev->broadcast))
 596                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 597
 598 #if IS_ENABLED(CONFIG_FCOE)
 599         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 600 #endif
 601
 602         dev->needed_headroom = real_dev->needed_headroom;
 603         if (vlan_hw_offload_capable(real_dev->features, vlan->vlan_proto)) {
 604                 dev->header_ops      = &vlan_passthru_header_ops;
 605                 dev->hard_header_len = real_dev->hard_header_len;
 606         } else {
 607                 dev->header_ops      = &vlan_header_ops;
 608                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 609         }
 610
 611         dev->netdev_ops = &vlan_netdev_ops;
 612
 613         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 614
 615         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 616
 617         vlan->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 618         if (!vlan->vlan_pcpu_stats)
 619                 return -ENOMEM;
 620
 621         return 0;
 622 }
 623
 624 static void vlan_dev_uninit(struct net_device *dev)
 625 {
 626         struct vlan_priority_tci_mapping *pm;
 627         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 628         int i;
 629
 630         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 631                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 632                         vlan->egress_priority_map[i] = pm->next;
 633                         kfree(pm);
 634                 }
 635         }
 636 }
 637
 638 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 639         netdev_features_t features)
 640 {
 641         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 642         netdev_features_t old_features = features;
 643         netdev_features_t lower_features;
 644
 645         lower_features = netdev_intersect_features((real_dev->vlan_features |
 646                                                     NETIF_F_RXCSUM),
 647                                                    real_dev->features);
 648
 649         /* Add HW_CSUM setting to preserve user ability to control
 650          * checksum offload on the vlan device.
 651          */
 652         if (lower_features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
 653                 lower_features |= NETIF_F_HW_CSUM;
 654         features = netdev_intersect_features(features, lower_features);
 655         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 656         features |= NETIF_F_LLTX;
 657
 658         return features;
 659 }
 660
 661 static int vlan_ethtool_get_link_ksettings(struct net_device *dev,
 662                                            struct ethtool_link_ksettings *cmd)
 663 {
 664         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 665
 666         return __ethtool_get_link_ksettings(vlan->real_dev, cmd);
 667 }
 668
 669 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 670                                      struct ethtool_drvinfo *info)
 671 {
 672         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 673         strlcpy(info->version, vlan_version, sizeof(info->version));
 674         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 675 }
 676
 677 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 678                                     struct ethtool_ts_info *info)
 679 {
 680         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 681         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 682         struct phy_device *phydev = vlan->real_dev->phydev;
 683
 684         if (phydev && phydev->drv && phydev->drv->ts_info) {
 685                  return phydev->drv->ts_info(phydev, info);
 686         } else if (ops->get_ts_info) {
 687                 return ops->get_ts_info(vlan->real_dev, info);
 688         } else {
 689                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 690                         SOF_TIMESTAMPING_SOFTWARE;
 691                 info->phc_index = -1;
 692         }
 693
 694         return 0;
 695 }
 696
 697 static void vlan_dev_get_stats64(struct net_device *dev,
 698                                  struct rtnl_link_stats64 *stats)
 699 {
 700         struct vlan_pcpu_stats *p;
 701         u32 rx_errors = 0, tx_dropped = 0;
 702         int i;
 703
 704         for_each_possible_cpu(i) {
 705                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 706                 unsigned int start;
 707
 708                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 709                 do {
 710                         start = u64_stats_fetch_begin_irq(&p->syncp);
 711                         rxpackets       = p->rx_packets;
 712                         rxbytes         = p->rx_bytes;
 713                         rxmulticast     = p->rx_multicast;
 714                         txpackets       = p->tx_packets;
 715                         txbytes         = p->tx_bytes;
 716                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 717
 718                 stats->rx_packets       += rxpackets;
 719                 stats->rx_bytes         += rxbytes;
 720                 stats->multicast        += rxmulticast;
 721                 stats->tx_packets       += txpackets;
 722                 stats->tx_bytes         += txbytes;
 723                 /* rx_errors & tx_dropped are u32 */
 724                 rx_errors       += p->rx_errors;
 725                 tx_dropped      += p->tx_dropped;
 726         }
 727         stats->rx_errors  = rx_errors;
 728         stats->tx_dropped = tx_dropped;
 729 }
 730
 731 #ifdef CONFIG_NET_POLL_CONTROLLER
 732 static void vlan_dev_poll_controller(struct net_device *dev)
 733 {
 734         return;
 735 }
 736
 737 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 738 {
 739         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 740         struct net_device *real_dev = vlan->real_dev;
 741         struct netpoll *netpoll;
 742         int err = 0;
 743
 744         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 745         err = -ENOMEM;
 746         if (!netpoll)
 747                 goto out;
 748
 749         err = __netpoll_setup(netpoll, real_dev);
 750         if (err) {
 751                 kfree(netpoll);
 752                 goto out;
 753         }
 754
 755         vlan->netpoll = netpoll;
 756
 757 out:
 758         return err;
 759 }
 760
 761 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 762 {
 763         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 764         struct netpoll *netpoll = vlan->netpoll;
 765
 766         if (!netpoll)
 767                 return;
 768
 769         vlan->netpoll = NULL;
 770         __netpoll_free(netpoll);
 771 }
 772 #endif /* CONFIG_NET_POLL_CONTROLLER */
 773
 774 static int vlan_dev_get_iflink(const struct net_device *dev)
 775 {
 776         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 777
 778         return real_dev->ifindex;
 779 }
 780
 781 static const struct ethtool_ops vlan_ethtool_ops = {
 782         .get_link_ksettings     = vlan_ethtool_get_link_ksettings,
 783         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 784         .get_link               = ethtool_op_get_link,
 785         .get_ts_info            = vlan_ethtool_get_ts_info,
 786 };
 787
 788 static const struct net_device_ops vlan_netdev_ops = {
 789         .ndo_change_mtu         = vlan_dev_change_mtu,
 790         .ndo_init               = vlan_dev_init,
 791         .ndo_uninit             = vlan_dev_uninit,
 792         .ndo_open               = vlan_dev_open,
 793         .ndo_stop               = vlan_dev_stop,
 794         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 795         .ndo_validate_addr      = eth_validate_addr,
 796         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 797         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 798         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 799         .ndo_do_ioctl           = vlan_dev_ioctl,
 800         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 801         .ndo_get_stats64        = vlan_dev_get_stats64,
 802 #if IS_ENABLED(CONFIG_FCOE)
 803         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 804         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 805         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 806         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 807         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 808 #endif
 809 #ifdef NETDEV_FCOE_WWNN
 810         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 811 #endif
 812 #ifdef CONFIG_NET_POLL_CONTROLLER
 813         .ndo_poll_controller    = vlan_dev_poll_controller,
 814         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 815         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 816 #endif
 817         .ndo_fix_features       = vlan_dev_fix_features,
 818         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 819         .ndo_get_iflink         = vlan_dev_get_iflink,
 820 };
 821
 822 static void vlan_dev_free(struct net_device *dev)
 823 {
 824         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 825
 826         free_percpu(vlan->vlan_pcpu_stats);
 827         vlan->vlan_pcpu_stats = NULL;
 828 }
 829
 830 void vlan_setup(struct net_device *dev)
 831 {
 832         ether_setup(dev);
 833
 834         dev->priv_flags         |= IFF_802_1Q_VLAN | IFF_NO_QUEUE;
 835         dev->priv_flags         |= IFF_UNICAST_FLT;
 836         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 837         netif_keep_dst(dev);
 838
 839         dev->netdev_ops         = &vlan_netdev_ops;
 840         dev->needs_free_netdev  = true;
 841         dev->priv_destructor    = vlan_dev_free;
 842         dev->ethtool_ops        = &vlan_ethtool_ops;
 843
 844         dev->min_mtu            = 0;
 845         dev->max_mtu            = ETH_MAX_MTU;
 846
 847         eth_zero_addr(dev->broadcast);
 848 }