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/etherdevice.h>
  30 #include <linux/ethtool.h>
  31 #include <net/arp.h>
  32
  33 #include "vlan.h"
  34 #include "vlanproc.h"
  35 #include <linux/if_vlan.h>
  36 #include <linux/netpoll.h>
  37
  38 /*
  39  *      Rebuild the Ethernet MAC header. This is called after an ARP
  40  *      (or in future other address resolution) has completed on this
  41  *      sk_buff. We now let ARP fill in the other fields.
  42  *
  43  *      This routine CANNOT use cached dst->neigh!
  44  *      Really, it is used only when dst->neigh is wrong.
  45  *
  46  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  47  */
  48 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  49 {
  50         struct net_device *dev = skb->dev;
  51         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  52
  53         switch (veth->h_vlan_encapsulated_proto) {
  54 #ifdef CONFIG_INET
  55         case htons(ETH_P_IP):
  56
  57                 /* TODO:  Confirm this will work with VLAN headers... */
  58                 return arp_find(veth->h_dest, skb);
  59 #endif
  60         default:
  61                 pr_debug("%s: unable to resolve type %X addresses\n",
  62                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  63
  64                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  65                 break;
  66         }
  67
  68         return 0;
  69 }
  70
  71 static inline u16
  72 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
  73 {
  74         struct vlan_priority_tci_mapping *mp;
  75
  76         mp = vlan_dev_priv(dev)->egress_priority_map[(skb->priority & 0xF)];
  77         while (mp) {
  78                 if (mp->priority == skb->priority) {
  79                         return mp->vlan_qos; /* This should already be shifted
  80                                               * to mask correctly with the
  81                                               * VLAN's TCI */
  82                 }
  83                 mp = mp->next;
  84         }
  85         return 0;
  86 }
  87
  88 /*
  89  *      Create the VLAN header for an arbitrary protocol layer
  90  *
  91  *      saddr=NULL      means use device source address
  92  *      daddr=NULL      means leave destination address (eg unresolved arp)
  93  *
  94  *  This is called when the SKB is moving down the stack towards the
  95  *  physical devices.
  96  */
  97 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  98                                 unsigned short type,
  99                                 const void *daddr, const void *saddr,
 100                                 unsigned int len)
 101 {
 102         struct vlan_hdr *vhdr;
 103         unsigned int vhdrlen = 0;
 104         u16 vlan_tci = 0;
 105         int rc;
 106
 107         if (!(vlan_dev_priv(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 108                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 109
 110                 vlan_tci = vlan_dev_priv(dev)->vlan_id;
 111                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 112                 vhdr->h_vlan_TCI = htons(vlan_tci);
 113
 114                 /*
 115                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 116                  *  put the length in here instead.
 117                  */
 118                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 119                         vhdr->h_vlan_encapsulated_proto = htons(type);
 120                 else
 121                         vhdr->h_vlan_encapsulated_proto = htons(len);
 122
 123                 skb->protocol = htons(ETH_P_8021Q);
 124                 type = ETH_P_8021Q;
 125                 vhdrlen = VLAN_HLEN;
 126         }
 127
 128         /* Before delegating work to the lower layer, enter our MAC-address */
 129         if (saddr == NULL)
 130                 saddr = dev->dev_addr;
 131
 132         /* Now make the underlying real hard header */
 133         dev = vlan_dev_priv(dev)->real_dev;
 134         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 135         if (rc > 0)
 136                 rc += vhdrlen;
 137         return rc;
 138 }
 139
 140 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 141 {
 142 #ifdef CONFIG_NET_POLL_CONTROLLER
 143         if (vlan->netpoll)
 144                 netpoll_send_skb(vlan->netpoll, skb);
 145 #else
 146         BUG();
 147 #endif
 148         return NETDEV_TX_OK;
 149 }
 150
 151 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 152                                             struct net_device *dev)
 153 {
 154         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 155         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 156         unsigned int len;
 157         int ret;
 158
 159         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 160          *
 161          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 162          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 163          */
 164         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 165             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 166                 u16 vlan_tci;
 167                 vlan_tci = vlan->vlan_id;
 168                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 169                 skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 170         }
 171
 172         skb->dev = vlan->real_dev;
 173         len = skb->len;
 174         if (unlikely(netpoll_tx_running(dev)))
 175                 return vlan_netpoll_send_skb(vlan, skb);
 176
 177         ret = dev_queue_xmit(skb);
 178
 179         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 180                 struct vlan_pcpu_stats *stats;
 181
 182                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 183                 u64_stats_update_begin(&stats->syncp);
 184                 stats->tx_packets++;
 185                 stats->tx_bytes += len;
 186                 u64_stats_update_end(&stats->syncp);
 187         } else {
 188                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 189         }
 190
 191         return ret;
 192 }
 193
 194 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 195 {
 196         /* TODO: gotta make sure the underlying layer can handle it,
 197          * maybe an IFF_VLAN_CAPABLE flag for devices?
 198          */
 199         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 200                 return -ERANGE;
 201
 202         dev->mtu = new_mtu;
 203
 204         return 0;
 205 }
 206
 207 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 208                                    u32 skb_prio, u16 vlan_prio)
 209 {
 210         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 211
 212         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 213                 vlan->nr_ingress_mappings--;
 214         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 215                 vlan->nr_ingress_mappings++;
 216
 217         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 218 }
 219
 220 int vlan_dev_set_egress_priority(const struct net_device *dev,
 221                                  u32 skb_prio, u16 vlan_prio)
 222 {
 223         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 224         struct vlan_priority_tci_mapping *mp = NULL;
 225         struct vlan_priority_tci_mapping *np;
 226         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 227
 228         /* See if a priority mapping exists.. */
 229         mp = vlan->egress_priority_map[skb_prio & 0xF];
 230         while (mp) {
 231                 if (mp->priority == skb_prio) {
 232                         if (mp->vlan_qos && !vlan_qos)
 233                                 vlan->nr_egress_mappings--;
 234                         else if (!mp->vlan_qos && vlan_qos)
 235                                 vlan->nr_egress_mappings++;
 236                         mp->vlan_qos = vlan_qos;
 237                         return 0;
 238                 }
 239                 mp = mp->next;
 240         }
 241
 242         /* Create a new mapping then. */
 243         mp = vlan->egress_priority_map[skb_prio & 0xF];
 244         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 245         if (!np)
 246                 return -ENOBUFS;
 247
 248         np->next = mp;
 249         np->priority = skb_prio;
 250         np->vlan_qos = vlan_qos;
 251         vlan->egress_priority_map[skb_prio & 0xF] = np;
 252         if (vlan_qos)
 253                 vlan->nr_egress_mappings++;
 254         return 0;
 255 }
 256
 257 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 258 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 259 {
 260         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 261         u32 old_flags = vlan->flags;
 262
 263         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 264                      VLAN_FLAG_LOOSE_BINDING))
 265                 return -EINVAL;
 266
 267         vlan->flags = (old_flags & ~mask) | (flags & mask);
 268
 269         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 270                 if (vlan->flags & VLAN_FLAG_GVRP)
 271                         vlan_gvrp_request_join(dev);
 272                 else
 273                         vlan_gvrp_request_leave(dev);
 274         }
 275         return 0;
 276 }
 277
 278 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 279 {
 280         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 281 }
 282
 283 static int vlan_dev_open(struct net_device *dev)
 284 {
 285         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 286         struct net_device *real_dev = vlan->real_dev;
 287         int err;
 288
 289         if (!(real_dev->flags & IFF_UP) &&
 290             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 291                 return -ENETDOWN;
 292
 293         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 294                 err = dev_uc_add(real_dev, dev->dev_addr);
 295                 if (err < 0)
 296                         goto out;
 297         }
 298
 299         if (dev->flags & IFF_ALLMULTI) {
 300                 err = dev_set_allmulti(real_dev, 1);
 301                 if (err < 0)
 302                         goto del_unicast;
 303         }
 304         if (dev->flags & IFF_PROMISC) {
 305                 err = dev_set_promiscuity(real_dev, 1);
 306                 if (err < 0)
 307                         goto clear_allmulti;
 308         }
 309
 310         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 311
 312         if (vlan->flags & VLAN_FLAG_GVRP)
 313                 vlan_gvrp_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         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 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                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 390                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 391                 break;
 392         }
 393
 394         if (!err)
 395                 ifr->ifr_ifru = ifrr.ifr_ifru;
 396
 397         return err;
 398 }
 399
 400 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 401 {
 402         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 403         const struct net_device_ops *ops = real_dev->netdev_ops;
 404         int err = 0;
 405
 406         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 407                 err = ops->ndo_neigh_setup(real_dev, pa);
 408
 409         return err;
 410 }
 411
 412 #if IS_ENABLED(CONFIG_FCOE)
 413 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 414                                    struct scatterlist *sgl, unsigned int sgc)
 415 {
 416         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 417         const struct net_device_ops *ops = real_dev->netdev_ops;
 418         int rc = 0;
 419
 420         if (ops->ndo_fcoe_ddp_setup)
 421                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 422
 423         return rc;
 424 }
 425
 426 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 427 {
 428         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 429         const struct net_device_ops *ops = real_dev->netdev_ops;
 430         int len = 0;
 431
 432         if (ops->ndo_fcoe_ddp_done)
 433                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 434
 435         return len;
 436 }
 437
 438 static int vlan_dev_fcoe_enable(struct net_device *dev)
 439 {
 440         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 441         const struct net_device_ops *ops = real_dev->netdev_ops;
 442         int rc = -EINVAL;
 443
 444         if (ops->ndo_fcoe_enable)
 445                 rc = ops->ndo_fcoe_enable(real_dev);
 446         return rc;
 447 }
 448
 449 static int vlan_dev_fcoe_disable(struct net_device *dev)
 450 {
 451         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 452         const struct net_device_ops *ops = real_dev->netdev_ops;
 453         int rc = -EINVAL;
 454
 455         if (ops->ndo_fcoe_disable)
 456                 rc = ops->ndo_fcoe_disable(real_dev);
 457         return rc;
 458 }
 459
 460 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 461 {
 462         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 463         const struct net_device_ops *ops = real_dev->netdev_ops;
 464         int rc = -EINVAL;
 465
 466         if (ops->ndo_fcoe_get_wwn)
 467                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 468         return rc;
 469 }
 470
 471 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 472                                     struct scatterlist *sgl, unsigned int sgc)
 473 {
 474         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 475         const struct net_device_ops *ops = real_dev->netdev_ops;
 476         int rc = 0;
 477
 478         if (ops->ndo_fcoe_ddp_target)
 479                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 480
 481         return rc;
 482 }
 483 #endif
 484
 485 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 486 {
 487         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 488
 489         if (dev->flags & IFF_UP) {
 490                 if (change & IFF_ALLMULTI)
 491                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 492                 if (change & IFF_PROMISC)
 493                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 494         }
 495 }
 496
 497 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 498 {
 499         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 500         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 501 }
 502
 503 /*
 504  * vlan network devices have devices nesting below it, and are a special
 505  * "super class" of normal network devices; split their locks off into a
 506  * separate class since they always nest.
 507  */
 508 static struct lock_class_key vlan_netdev_xmit_lock_key;
 509 static struct lock_class_key vlan_netdev_addr_lock_key;
 510
 511 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 512                                      struct netdev_queue *txq,
 513                                      void *_subclass)
 514 {
 515         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 516                                        &vlan_netdev_xmit_lock_key,
 517                                        *(int *)_subclass);
 518 }
 519
 520 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 521 {
 522         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 523                                        &vlan_netdev_addr_lock_key,
 524                                        subclass);
 525         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 526 }
 527
 528 static const struct header_ops vlan_header_ops = {
 529         .create  = vlan_dev_hard_header,
 530         .rebuild = vlan_dev_rebuild_header,
 531         .parse   = eth_header_parse,
 532 };
 533
 534 static struct device_type vlan_type = {
 535         .name   = "vlan",
 536 };
 537
 538 static const struct net_device_ops vlan_netdev_ops;
 539
 540 static int vlan_dev_init(struct net_device *dev)
 541 {
 542         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 543         int subclass = 0;
 544
 545         netif_carrier_off(dev);
 546
 547         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 548         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 549                                           IFF_MASTER | IFF_SLAVE);
 550         dev->iflink = real_dev->ifindex;
 551         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 552                                           (1<<__LINK_STATE_DORMANT))) |
 553                       (1<<__LINK_STATE_PRESENT);
 554
 555         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 556                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 557                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 558                            NETIF_F_ALL_FCOE;
 559
 560         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 561         dev->gso_max_size = real_dev->gso_max_size;
 562
 563         /* ipv6 shared card related stuff */
 564         dev->dev_id = real_dev->dev_id;
 565
 566         if (is_zero_ether_addr(dev->dev_addr))
 567                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 568         if (is_zero_ether_addr(dev->broadcast))
 569                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 570
 571 #if IS_ENABLED(CONFIG_FCOE)
 572         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 573 #endif
 574
 575         dev->needed_headroom = real_dev->needed_headroom;
 576         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 577                 dev->header_ops      = real_dev->header_ops;
 578                 dev->hard_header_len = real_dev->hard_header_len;
 579         } else {
 580                 dev->header_ops      = &vlan_header_ops;
 581                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 582         }
 583
 584         dev->netdev_ops = &vlan_netdev_ops;
 585
 586         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 587
 588         if (is_vlan_dev(real_dev))
 589                 subclass = 1;
 590
 591         vlan_dev_set_lockdep_class(dev, subclass);
 592
 593         vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 594         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 595                 return -ENOMEM;
 596
 597         return 0;
 598 }
 599
 600 static void vlan_dev_uninit(struct net_device *dev)
 601 {
 602         struct vlan_priority_tci_mapping *pm;
 603         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 604         int i;
 605
 606         free_percpu(vlan->vlan_pcpu_stats);
 607         vlan->vlan_pcpu_stats = NULL;
 608         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 609                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 610                         vlan->egress_priority_map[i] = pm->next;
 611                         kfree(pm);
 612                 }
 613         }
 614 }
 615
 616 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 617         netdev_features_t features)
 618 {
 619         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 620         u32 old_features = features;
 621
 622         features &= real_dev->vlan_features;
 623         features |= NETIF_F_RXCSUM;
 624         features &= real_dev->features;
 625
 626         features |= old_features & NETIF_F_SOFT_FEATURES;
 627         features |= NETIF_F_LLTX;
 628
 629         return features;
 630 }
 631
 632 static int vlan_ethtool_get_settings(struct net_device *dev,
 633                                      struct ethtool_cmd *cmd)
 634 {
 635         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 636
 637         return __ethtool_get_settings(vlan->real_dev, cmd);
 638 }
 639
 640 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 641                                      struct ethtool_drvinfo *info)
 642 {
 643         strcpy(info->driver, vlan_fullname);
 644         strcpy(info->version, vlan_version);
 645         strcpy(info->fw_version, "N/A");
 646 }
 647
 648 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 649 {
 650
 651         if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
 652                 struct vlan_pcpu_stats *p;
 653                 u32 rx_errors = 0, tx_dropped = 0;
 654                 int i;
 655
 656                 for_each_possible_cpu(i) {
 657                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 658                         unsigned int start;
 659
 660                         p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 661                         do {
 662                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 663                                 rxpackets       = p->rx_packets;
 664                                 rxbytes         = p->rx_bytes;
 665                                 rxmulticast     = p->rx_multicast;
 666                                 txpackets       = p->tx_packets;
 667                                 txbytes         = p->tx_bytes;
 668                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 669
 670                         stats->rx_packets       += rxpackets;
 671                         stats->rx_bytes         += rxbytes;
 672                         stats->multicast        += rxmulticast;
 673                         stats->tx_packets       += txpackets;
 674                         stats->tx_bytes         += txbytes;
 675                         /* rx_errors & tx_dropped are u32 */
 676                         rx_errors       += p->rx_errors;
 677                         tx_dropped      += p->tx_dropped;
 678                 }
 679                 stats->rx_errors  = rx_errors;
 680                 stats->tx_dropped = tx_dropped;
 681         }
 682         return stats;
 683 }
 684
 685 #ifdef CONFIG_NET_POLL_CONTROLLER
 686 static void vlan_dev_poll_controller(struct net_device *dev)
 687 {
 688         return;
 689 }
 690
 691 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo,
 692                                   gfp_t gfp)
 693 {
 694         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 695         struct net_device *real_dev = vlan->real_dev;
 696         struct netpoll *netpoll;
 697         int err = 0;
 698
 699         netpoll = kzalloc(sizeof(*netpoll), gfp);
 700         err = -ENOMEM;
 701         if (!netpoll)
 702                 goto out;
 703
 704         err = __netpoll_setup(netpoll, real_dev, gfp);
 705         if (err) {
 706                 kfree(netpoll);
 707                 goto out;
 708         }
 709
 710         vlan->netpoll = netpoll;
 711
 712 out:
 713         return err;
 714 }
 715
 716 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 717 {
 718         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 719         struct netpoll *netpoll = vlan->netpoll;
 720
 721         if (!netpoll)
 722                 return;
 723
 724         vlan->netpoll = NULL;
 725
 726         __netpoll_free_rcu(netpoll);
 727 }
 728 #endif /* CONFIG_NET_POLL_CONTROLLER */
 729
 730 static const struct ethtool_ops vlan_ethtool_ops = {
 731         .get_settings           = vlan_ethtool_get_settings,
 732         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 733         .get_link               = ethtool_op_get_link,
 734 };
 735
 736 static const struct net_device_ops vlan_netdev_ops = {
 737         .ndo_change_mtu         = vlan_dev_change_mtu,
 738         .ndo_init               = vlan_dev_init,
 739         .ndo_uninit             = vlan_dev_uninit,
 740         .ndo_open               = vlan_dev_open,
 741         .ndo_stop               = vlan_dev_stop,
 742         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 743         .ndo_validate_addr      = eth_validate_addr,
 744         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 745         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 746         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 747         .ndo_do_ioctl           = vlan_dev_ioctl,
 748         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 749         .ndo_get_stats64        = vlan_dev_get_stats64,
 750 #if IS_ENABLED(CONFIG_FCOE)
 751         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 752         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 753         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 754         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 755         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 756         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 757 #endif
 758 #ifdef CONFIG_NET_POLL_CONTROLLER
 759         .ndo_poll_controller    = vlan_dev_poll_controller,
 760         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 761         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 762 #endif
 763         .ndo_fix_features       = vlan_dev_fix_features,
 764 };
 765
 766 void vlan_setup(struct net_device *dev)
 767 {
 768         ether_setup(dev);
 769
 770         dev->priv_flags         |= IFF_802_1Q_VLAN;
 771         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 772         dev->tx_queue_len       = 0;
 773
 774         dev->netdev_ops         = &vlan_netdev_ops;
 775         dev->destructor         = free_netdev;
 776         dev->ethtool_ops        = &vlan_ethtool_ops;
 777
 778         memset(dev->broadcast, 0, ETH_ALEN);
 779 }