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 <net/arp.h>
  33
  34 #include "vlan.h"
  35 #include "vlanproc.h"
  36 #include <linux/if_vlan.h>
  37 #include <linux/netpoll.h>
  38
  39 /*
  40  *      Rebuild the Ethernet MAC header. This is called after an ARP
  41  *      (or in future other address resolution) has completed on this
  42  *      sk_buff. We now let ARP fill in the other fields.
  43  *
  44  *      This routine CANNOT use cached dst->neigh!
  45  *      Really, it is used only when dst->neigh is wrong.
  46  *
  47  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  48  */
  49 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  50 {
  51         struct net_device *dev = skb->dev;
  52         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  53
  54         switch (veth->h_vlan_encapsulated_proto) {
  55 #ifdef CONFIG_INET
  56         case htons(ETH_P_IP):
  57
  58                 /* TODO:  Confirm this will work with VLAN headers... */
  59                 return arp_find(veth->h_dest, skb);
  60 #endif
  61         default:
  62                 pr_debug("%s: unable to resolve type %X addresses\n",
  63                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  64
  65                 ether_addr_copy(veth->h_source, dev->dev_addr);
  66                 break;
  67         }
  68
  69         return 0;
  70 }
  71
  72 /*
  73  *      Create the VLAN header for an arbitrary protocol layer
  74  *
  75  *      saddr=NULL      means use device source address
  76  *      daddr=NULL      means leave destination address (eg unresolved arp)
  77  *
  78  *  This is called when the SKB is moving down the stack towards the
  79  *  physical devices.
  80  */
  81 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  82                                 unsigned short type,
  83                                 const void *daddr, const void *saddr,
  84                                 unsigned int len)
  85 {
  86         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  87         struct vlan_hdr *vhdr;
  88         unsigned int vhdrlen = 0;
  89         u16 vlan_tci = 0;
  90         int rc;
  91
  92         if (!(vlan->flags & VLAN_FLAG_REORDER_HDR)) {
  93                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
  94
  95                 vlan_tci = vlan->vlan_id;
  96                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
  97                 vhdr->h_vlan_TCI = htons(vlan_tci);
  98
  99                 /*
 100                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 101                  *  put the length in here instead.
 102                  */
 103                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 104                         vhdr->h_vlan_encapsulated_proto = htons(type);
 105                 else
 106                         vhdr->h_vlan_encapsulated_proto = htons(len);
 107
 108                 skb->protocol = vlan->vlan_proto;
 109                 type = ntohs(vlan->vlan_proto);
 110                 vhdrlen = VLAN_HLEN;
 111         }
 112
 113         /* Before delegating work to the lower layer, enter our MAC-address */
 114         if (saddr == NULL)
 115                 saddr = dev->dev_addr;
 116
 117         /* Now make the underlying real hard header */
 118         dev = vlan->real_dev;
 119         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 120         if (rc > 0)
 121                 rc += vhdrlen;
 122         return rc;
 123 }
 124
 125 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 126 {
 127 #ifdef CONFIG_NET_POLL_CONTROLLER
 128         if (vlan->netpoll)
 129                 netpoll_send_skb(vlan->netpoll, skb);
 130 #else
 131         BUG();
 132 #endif
 133         return NETDEV_TX_OK;
 134 }
 135
 136 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 137                                             struct net_device *dev)
 138 {
 139         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 140         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 141         unsigned int len;
 142         int ret;
 143
 144         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 145          *
 146          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 147          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 148          */
 149         if (veth->h_vlan_proto != vlan->vlan_proto ||
 150             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 151                 u16 vlan_tci;
 152                 vlan_tci = vlan->vlan_id;
 153                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb->priority);
 154                 __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 155         }
 156
 157         skb->dev = vlan->real_dev;
 158         len = skb->len;
 159         if (unlikely(netpoll_tx_running(dev)))
 160                 return vlan_netpoll_send_skb(vlan, skb);
 161
 162         ret = dev_queue_xmit(skb);
 163
 164         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 165                 struct vlan_pcpu_stats *stats;
 166
 167                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 168                 u64_stats_update_begin(&stats->syncp);
 169                 stats->tx_packets++;
 170                 stats->tx_bytes += len;
 171                 u64_stats_update_end(&stats->syncp);
 172         } else {
 173                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 174         }
 175
 176         return ret;
 177 }
 178
 179 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 180 {
 181         /* TODO: gotta make sure the underlying layer can handle it,
 182          * maybe an IFF_VLAN_CAPABLE flag for devices?
 183          */
 184         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 185                 return -ERANGE;
 186
 187         dev->mtu = new_mtu;
 188
 189         return 0;
 190 }
 191
 192 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 193                                    u32 skb_prio, u16 vlan_prio)
 194 {
 195         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 196
 197         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 198                 vlan->nr_ingress_mappings--;
 199         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 200                 vlan->nr_ingress_mappings++;
 201
 202         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 203 }
 204
 205 int vlan_dev_set_egress_priority(const struct net_device *dev,
 206                                  u32 skb_prio, u16 vlan_prio)
 207 {
 208         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 209         struct vlan_priority_tci_mapping *mp = NULL;
 210         struct vlan_priority_tci_mapping *np;
 211         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 212
 213         /* See if a priority mapping exists.. */
 214         mp = vlan->egress_priority_map[skb_prio & 0xF];
 215         while (mp) {
 216                 if (mp->priority == skb_prio) {
 217                         if (mp->vlan_qos && !vlan_qos)
 218                                 vlan->nr_egress_mappings--;
 219                         else if (!mp->vlan_qos && vlan_qos)
 220                                 vlan->nr_egress_mappings++;
 221                         mp->vlan_qos = vlan_qos;
 222                         return 0;
 223                 }
 224                 mp = mp->next;
 225         }
 226
 227         /* Create a new mapping then. */
 228         mp = vlan->egress_priority_map[skb_prio & 0xF];
 229         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 230         if (!np)
 231                 return -ENOBUFS;
 232
 233         np->next = mp;
 234         np->priority = skb_prio;
 235         np->vlan_qos = vlan_qos;
 236         /* Before inserting this element in hash table, make sure all its fields
 237          * are committed to memory.
 238          * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
 239          */
 240         smp_wmb();
 241         vlan->egress_priority_map[skb_prio & 0xF] = np;
 242         if (vlan_qos)
 243                 vlan->nr_egress_mappings++;
 244         return 0;
 245 }
 246
 247 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 248 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 249 {
 250         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 251         u32 old_flags = vlan->flags;
 252
 253         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 254                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 255                 return -EINVAL;
 256
 257         vlan->flags = (old_flags & ~mask) | (flags & mask);
 258
 259         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 260                 if (vlan->flags & VLAN_FLAG_GVRP)
 261                         vlan_gvrp_request_join(dev);
 262                 else
 263                         vlan_gvrp_request_leave(dev);
 264         }
 265
 266         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 267                 if (vlan->flags & VLAN_FLAG_MVRP)
 268                         vlan_mvrp_request_join(dev);
 269                 else
 270                         vlan_mvrp_request_leave(dev);
 271         }
 272         return 0;
 273 }
 274
 275 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 276 {
 277         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 278 }
 279
 280 static int vlan_dev_open(struct net_device *dev)
 281 {
 282         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 283         struct net_device *real_dev = vlan->real_dev;
 284         int err;
 285
 286         if (!(real_dev->flags & IFF_UP) &&
 287             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 288                 return -ENETDOWN;
 289
 290         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 291                 err = dev_uc_add(real_dev, dev->dev_addr);
 292                 if (err < 0)
 293                         goto out;
 294         }
 295
 296         if (dev->flags & IFF_ALLMULTI) {
 297                 err = dev_set_allmulti(real_dev, 1);
 298                 if (err < 0)
 299                         goto del_unicast;
 300         }
 301         if (dev->flags & IFF_PROMISC) {
 302                 err = dev_set_promiscuity(real_dev, 1);
 303                 if (err < 0)
 304                         goto clear_allmulti;
 305         }
 306
 307         ether_addr_copy(vlan->real_dev_addr, real_dev->dev_addr);
 308
 309         if (vlan->flags & VLAN_FLAG_GVRP)
 310                 vlan_gvrp_request_join(dev);
 311
 312         if (vlan->flags & VLAN_FLAG_MVRP)
 313                 vlan_mvrp_request_join(dev);
 314
 315         if (netif_carrier_ok(real_dev))
 316                 netif_carrier_on(dev);
 317         return 0;
 318
 319 clear_allmulti:
 320         if (dev->flags & IFF_ALLMULTI)
 321                 dev_set_allmulti(real_dev, -1);
 322 del_unicast:
 323         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 324                 dev_uc_del(real_dev, dev->dev_addr);
 325 out:
 326         netif_carrier_off(dev);
 327         return err;
 328 }
 329
 330 static int vlan_dev_stop(struct net_device *dev)
 331 {
 332         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 333         struct net_device *real_dev = vlan->real_dev;
 334
 335         dev_mc_unsync(real_dev, dev);
 336         dev_uc_unsync(real_dev, dev);
 337         if (dev->flags & IFF_ALLMULTI)
 338                 dev_set_allmulti(real_dev, -1);
 339         if (dev->flags & IFF_PROMISC)
 340                 dev_set_promiscuity(real_dev, -1);
 341
 342         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 343                 dev_uc_del(real_dev, dev->dev_addr);
 344
 345         netif_carrier_off(dev);
 346         return 0;
 347 }
 348
 349 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 350 {
 351         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 352         struct sockaddr *addr = p;
 353         int err;
 354
 355         if (!is_valid_ether_addr(addr->sa_data))
 356                 return -EADDRNOTAVAIL;
 357
 358         if (!(dev->flags & IFF_UP))
 359                 goto out;
 360
 361         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 362                 err = dev_uc_add(real_dev, addr->sa_data);
 363                 if (err < 0)
 364                         return err;
 365         }
 366
 367         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 368                 dev_uc_del(real_dev, dev->dev_addr);
 369
 370 out:
 371         ether_addr_copy(dev->dev_addr, addr->sa_data);
 372         return 0;
 373 }
 374
 375 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 376 {
 377         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 378         const struct net_device_ops *ops = real_dev->netdev_ops;
 379         struct ifreq ifrr;
 380         int err = -EOPNOTSUPP;
 381
 382         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 383         ifrr.ifr_ifru = ifr->ifr_ifru;
 384
 385         switch (cmd) {
 386         case SIOCGMIIPHY:
 387         case SIOCGMIIREG:
 388         case SIOCSMIIREG:
 389         case SIOCSHWTSTAMP:
 390         case SIOCGHWTSTAMP:
 391                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 392                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 393                 break;
 394         }
 395
 396         if (!err)
 397                 ifr->ifr_ifru = ifrr.ifr_ifru;
 398
 399         return err;
 400 }
 401
 402 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 403 {
 404         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 405         const struct net_device_ops *ops = real_dev->netdev_ops;
 406         int err = 0;
 407
 408         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 409                 err = ops->ndo_neigh_setup(real_dev, pa);
 410
 411         return err;
 412 }
 413
 414 #if IS_ENABLED(CONFIG_FCOE)
 415 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 416                                    struct scatterlist *sgl, unsigned int sgc)
 417 {
 418         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 419         const struct net_device_ops *ops = real_dev->netdev_ops;
 420         int rc = 0;
 421
 422         if (ops->ndo_fcoe_ddp_setup)
 423                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 424
 425         return rc;
 426 }
 427
 428 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 429 {
 430         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 431         const struct net_device_ops *ops = real_dev->netdev_ops;
 432         int len = 0;
 433
 434         if (ops->ndo_fcoe_ddp_done)
 435                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 436
 437         return len;
 438 }
 439
 440 static int vlan_dev_fcoe_enable(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_enable)
 447                 rc = ops->ndo_fcoe_enable(real_dev);
 448         return rc;
 449 }
 450
 451 static int vlan_dev_fcoe_disable(struct net_device *dev)
 452 {
 453         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 454         const struct net_device_ops *ops = real_dev->netdev_ops;
 455         int rc = -EINVAL;
 456
 457         if (ops->ndo_fcoe_disable)
 458                 rc = ops->ndo_fcoe_disable(real_dev);
 459         return rc;
 460 }
 461
 462 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 463 {
 464         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 465         const struct net_device_ops *ops = real_dev->netdev_ops;
 466         int rc = -EINVAL;
 467
 468         if (ops->ndo_fcoe_get_wwn)
 469                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 470         return rc;
 471 }
 472
 473 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 474                                     struct scatterlist *sgl, unsigned int sgc)
 475 {
 476         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 477         const struct net_device_ops *ops = real_dev->netdev_ops;
 478         int rc = 0;
 479
 480         if (ops->ndo_fcoe_ddp_target)
 481                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 482
 483         return rc;
 484 }
 485 #endif
 486
 487 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 488 {
 489         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 490
 491         if (dev->flags & IFF_UP) {
 492                 if (change & IFF_ALLMULTI)
 493                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 494                 if (change & IFF_PROMISC)
 495                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 496         }
 497 }
 498
 499 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 500 {
 501         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 502         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 503 }
 504
 505 /*
 506  * vlan network devices have devices nesting below it, and are a special
 507  * "super class" of normal network devices; split their locks off into a
 508  * separate class since they always nest.
 509  */
 510 static struct lock_class_key vlan_netdev_xmit_lock_key;
 511 static struct lock_class_key vlan_netdev_addr_lock_key;
 512
 513 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 514                                      struct netdev_queue *txq,
 515                                      void *_subclass)
 516 {
 517         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 518                                        &vlan_netdev_xmit_lock_key,
 519                                        *(int *)_subclass);
 520 }
 521
 522 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 523 {
 524         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 525                                        &vlan_netdev_addr_lock_key,
 526                                        subclass);
 527         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 528 }
 529
 530 static int vlan_dev_get_lock_subclass(struct net_device *dev)
 531 {
 532         return vlan_dev_priv(dev)->nest_level;
 533 }
 534
 535 static const struct header_ops vlan_header_ops = {
 536         .create  = vlan_dev_hard_header,
 537         .rebuild = vlan_dev_rebuild_header,
 538         .parse   = eth_header_parse,
 539 };
 540
 541 static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
 542                                      unsigned short type,
 543                                      const void *daddr, const void *saddr,
 544                                      unsigned int len)
 545 {
 546         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 547         struct net_device *real_dev = vlan->real_dev;
 548
 549         if (saddr == NULL)
 550                 saddr = dev->dev_addr;
 551
 552         return dev_hard_header(skb, real_dev, type, daddr, saddr, len);
 553 }
 554
 555 static const struct header_ops vlan_passthru_header_ops = {
 556         .create  = vlan_passthru_hard_header,
 557         .rebuild = dev_rebuild_header,
 558         .parse   = eth_header_parse,
 559 };
 560
 561 static struct device_type vlan_type = {
 562         .name   = "vlan",
 563 };
 564
 565 static const struct net_device_ops vlan_netdev_ops;
 566
 567 static int vlan_dev_init(struct net_device *dev)
 568 {
 569         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 570
 571         netif_carrier_off(dev);
 572
 573         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 574         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 575                                           IFF_MASTER | IFF_SLAVE);
 576         dev->iflink = real_dev->ifindex;
 577         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 578                                           (1<<__LINK_STATE_DORMANT))) |
 579                       (1<<__LINK_STATE_PRESENT);
 580
 581         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 582                            NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE |
 583                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 584                            NETIF_F_ALL_FCOE;
 585
 586         dev->features |= real_dev->vlan_features | NETIF_F_LLTX |
 587                          NETIF_F_GSO_SOFTWARE;
 588         dev->gso_max_size = real_dev->gso_max_size;
 589         if (dev->features & NETIF_F_VLAN_FEATURES)
 590                 netdev_warn(real_dev, "VLAN features are set incorrectly.  Q-in-Q configurations may not work correctly.\n");
 591
 592
 593         /* ipv6 shared card related stuff */
 594         dev->dev_id = real_dev->dev_id;
 595
 596         if (is_zero_ether_addr(dev->dev_addr))
 597                 eth_hw_addr_inherit(dev, real_dev);
 598         if (is_zero_ether_addr(dev->broadcast))
 599                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 600
 601 #if IS_ENABLED(CONFIG_FCOE)
 602         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 603 #endif
 604
 605         dev->needed_headroom = real_dev->needed_headroom;
 606         if (vlan_hw_offload_capable(real_dev->features,
 607                                     vlan_dev_priv(dev)->vlan_proto)) {
 608                 dev->header_ops      = &vlan_passthru_header_ops;
 609                 dev->hard_header_len = real_dev->hard_header_len;
 610         } else {
 611                 dev->header_ops      = &vlan_header_ops;
 612                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 613         }
 614
 615         dev->netdev_ops = &vlan_netdev_ops;
 616
 617         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 618
 619         vlan_dev_set_lockdep_class(dev, vlan_dev_get_lock_subclass(dev));
 620
 621         vlan_dev_priv(dev)->vlan_pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
 622         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 623                 return -ENOMEM;
 624
 625         return 0;
 626 }
 627
 628 static void vlan_dev_uninit(struct net_device *dev)
 629 {
 630         struct vlan_priority_tci_mapping *pm;
 631         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 632         int i;
 633
 634         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 635                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 636                         vlan->egress_priority_map[i] = pm->next;
 637                         kfree(pm);
 638                 }
 639         }
 640 }
 641
 642 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 643         netdev_features_t features)
 644 {
 645         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 646         netdev_features_t old_features = features;
 647
 648         features = netdev_intersect_features(features, real_dev->vlan_features);
 649         features |= NETIF_F_RXCSUM;
 650         features = netdev_intersect_features(features, real_dev->features);
 651
 652         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_GSO_SOFTWARE);
 653         features |= NETIF_F_LLTX;
 654
 655         return features;
 656 }
 657
 658 static int vlan_ethtool_get_settings(struct net_device *dev,
 659                                      struct ethtool_cmd *cmd)
 660 {
 661         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 662
 663         return __ethtool_get_settings(vlan->real_dev, cmd);
 664 }
 665
 666 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 667                                      struct ethtool_drvinfo *info)
 668 {
 669         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 670         strlcpy(info->version, vlan_version, sizeof(info->version));
 671         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 672 }
 673
 674 static int vlan_ethtool_get_ts_info(struct net_device *dev,
 675                                     struct ethtool_ts_info *info)
 676 {
 677         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 678         const struct ethtool_ops *ops = vlan->real_dev->ethtool_ops;
 679
 680         if (ops->get_ts_info) {
 681                 return ops->get_ts_info(vlan->real_dev, info);
 682         } else {
 683                 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
 684                         SOF_TIMESTAMPING_SOFTWARE;
 685                 info->phc_index = -1;
 686         }
 687
 688         return 0;
 689 }
 690
 691 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 692 {
 693         struct vlan_pcpu_stats *p;
 694         u32 rx_errors = 0, tx_dropped = 0;
 695         int i;
 696
 697         for_each_possible_cpu(i) {
 698                 u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 699                 unsigned int start;
 700
 701                 p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 702                 do {
 703                         start = u64_stats_fetch_begin_irq(&p->syncp);
 704                         rxpackets       = p->rx_packets;
 705                         rxbytes         = p->rx_bytes;
 706                         rxmulticast     = p->rx_multicast;
 707                         txpackets       = p->tx_packets;
 708                         txbytes         = p->tx_bytes;
 709                 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
 710
 711                 stats->rx_packets       += rxpackets;
 712                 stats->rx_bytes         += rxbytes;
 713                 stats->multicast        += rxmulticast;
 714                 stats->tx_packets       += txpackets;
 715                 stats->tx_bytes         += txbytes;
 716                 /* rx_errors & tx_dropped are u32 */
 717                 rx_errors       += p->rx_errors;
 718                 tx_dropped      += p->tx_dropped;
 719         }
 720         stats->rx_errors  = rx_errors;
 721         stats->tx_dropped = tx_dropped;
 722
 723         return stats;
 724 }
 725
 726 #ifdef CONFIG_NET_POLL_CONTROLLER
 727 static void vlan_dev_poll_controller(struct net_device *dev)
 728 {
 729         return;
 730 }
 731
 732 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
 733 {
 734         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 735         struct net_device *real_dev = vlan->real_dev;
 736         struct netpoll *netpoll;
 737         int err = 0;
 738
 739         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
 740         err = -ENOMEM;
 741         if (!netpoll)
 742                 goto out;
 743
 744         err = __netpoll_setup(netpoll, real_dev);
 745         if (err) {
 746                 kfree(netpoll);
 747                 goto out;
 748         }
 749
 750         vlan->netpoll = netpoll;
 751
 752 out:
 753         return err;
 754 }
 755
 756 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 757 {
 758         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 759         struct netpoll *netpoll = vlan->netpoll;
 760
 761         if (!netpoll)
 762                 return;
 763
 764         vlan->netpoll = NULL;
 765
 766         __netpoll_free_async(netpoll);
 767 }
 768 #endif /* CONFIG_NET_POLL_CONTROLLER */
 769
 770 static const struct ethtool_ops vlan_ethtool_ops = {
 771         .get_settings           = vlan_ethtool_get_settings,
 772         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 773         .get_link               = ethtool_op_get_link,
 774         .get_ts_info            = vlan_ethtool_get_ts_info,
 775 };
 776
 777 static const struct net_device_ops vlan_netdev_ops = {
 778         .ndo_change_mtu         = vlan_dev_change_mtu,
 779         .ndo_init               = vlan_dev_init,
 780         .ndo_uninit             = vlan_dev_uninit,
 781         .ndo_open               = vlan_dev_open,
 782         .ndo_stop               = vlan_dev_stop,
 783         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 784         .ndo_validate_addr      = eth_validate_addr,
 785         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 786         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 787         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 788         .ndo_do_ioctl           = vlan_dev_ioctl,
 789         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 790         .ndo_get_stats64        = vlan_dev_get_stats64,
 791 #if IS_ENABLED(CONFIG_FCOE)
 792         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 793         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 794         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 795         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 796         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 797         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 798 #endif
 799 #ifdef CONFIG_NET_POLL_CONTROLLER
 800         .ndo_poll_controller    = vlan_dev_poll_controller,
 801         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 802         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 803 #endif
 804         .ndo_fix_features       = vlan_dev_fix_features,
 805         .ndo_get_lock_subclass  = vlan_dev_get_lock_subclass,
 806 };
 807
 808 static void vlan_dev_free(struct net_device *dev)
 809 {
 810         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 811
 812         free_percpu(vlan->vlan_pcpu_stats);
 813         vlan->vlan_pcpu_stats = NULL;
 814         free_netdev(dev);
 815 }
 816
 817 void vlan_setup(struct net_device *dev)
 818 {
 819         ether_setup(dev);
 820
 821         dev->priv_flags         |= IFF_802_1Q_VLAN;
 822         dev->priv_flags         &= ~IFF_TX_SKB_SHARING;
 823         netif_keep_dst(dev);
 824         dev->tx_queue_len       = 0;
 825
 826         dev->netdev_ops         = &vlan_netdev_ops;
 827         dev->destructor         = vlan_dev_free;
 828         dev->ethtool_ops        = &vlan_ethtool_ops;
 829
 830         memset(dev->broadcast, 0, ETH_ALEN);
 831 }