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_dev_priv *vlan = vlan_dev_priv(dev);
 103         struct vlan_hdr *vhdr;
 104         unsigned int vhdrlen = 0;
 105         u16 vlan_tci = 0;
 106         int rc;
 107
 108         if (!(vlan_dev_priv(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 109                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 110
 111                 vlan_tci = vlan_dev_priv(dev)->vlan_id;
 112                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 113                 vhdr->h_vlan_TCI = htons(vlan_tci);
 114
 115                 /*
 116                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 117                  *  put the length in here instead.
 118                  */
 119                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 120                         vhdr->h_vlan_encapsulated_proto = htons(type);
 121                 else
 122                         vhdr->h_vlan_encapsulated_proto = htons(len);
 123
 124                 skb->protocol = vlan->vlan_proto;
 125                 type = ntohs(vlan->vlan_proto);
 126                 vhdrlen = VLAN_HLEN;
 127         }
 128
 129         /* Before delegating work to the lower layer, enter our MAC-address */
 130         if (saddr == NULL)
 131                 saddr = dev->dev_addr;
 132
 133         /* Now make the underlying real hard header */
 134         dev = vlan_dev_priv(dev)->real_dev;
 135         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 136         if (rc > 0)
 137                 rc += vhdrlen;
 138         return rc;
 139 }
 140
 141 static inline netdev_tx_t vlan_netpoll_send_skb(struct vlan_dev_priv *vlan, struct sk_buff *skb)
 142 {
 143 #ifdef CONFIG_NET_POLL_CONTROLLER
 144         if (vlan->netpoll)
 145                 netpoll_send_skb(vlan->netpoll, skb);
 146 #else
 147         BUG();
 148 #endif
 149         return NETDEV_TX_OK;
 150 }
 151
 152 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 153                                             struct net_device *dev)
 154 {
 155         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 156         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 157         unsigned int len;
 158         int ret;
 159
 160         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 161          *
 162          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 163          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 164          */
 165         if (veth->h_vlan_proto != vlan->vlan_proto ||
 166             vlan->flags & VLAN_FLAG_REORDER_HDR) {
 167                 u16 vlan_tci;
 168                 vlan_tci = vlan->vlan_id;
 169                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 170                 skb = __vlan_hwaccel_put_tag(skb, vlan->vlan_proto, vlan_tci);
 171         }
 172
 173         skb->dev = vlan->real_dev;
 174         len = skb->len;
 175         if (unlikely(netpoll_tx_running(dev)))
 176                 return vlan_netpoll_send_skb(vlan, skb);
 177
 178         ret = dev_queue_xmit(skb);
 179
 180         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 181                 struct vlan_pcpu_stats *stats;
 182
 183                 stats = this_cpu_ptr(vlan->vlan_pcpu_stats);
 184                 u64_stats_update_begin(&stats->syncp);
 185                 stats->tx_packets++;
 186                 stats->tx_bytes += len;
 187                 u64_stats_update_end(&stats->syncp);
 188         } else {
 189                 this_cpu_inc(vlan->vlan_pcpu_stats->tx_dropped);
 190         }
 191
 192         return ret;
 193 }
 194
 195 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 196 {
 197         /* TODO: gotta make sure the underlying layer can handle it,
 198          * maybe an IFF_VLAN_CAPABLE flag for devices?
 199          */
 200         if (vlan_dev_priv(dev)->real_dev->mtu < new_mtu)
 201                 return -ERANGE;
 202
 203         dev->mtu = new_mtu;
 204
 205         return 0;
 206 }
 207
 208 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 209                                    u32 skb_prio, u16 vlan_prio)
 210 {
 211         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 212
 213         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 214                 vlan->nr_ingress_mappings--;
 215         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 216                 vlan->nr_ingress_mappings++;
 217
 218         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 219 }
 220
 221 int vlan_dev_set_egress_priority(const struct net_device *dev,
 222                                  u32 skb_prio, u16 vlan_prio)
 223 {
 224         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 225         struct vlan_priority_tci_mapping *mp = NULL;
 226         struct vlan_priority_tci_mapping *np;
 227         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 228
 229         /* See if a priority mapping exists.. */
 230         mp = vlan->egress_priority_map[skb_prio & 0xF];
 231         while (mp) {
 232                 if (mp->priority == skb_prio) {
 233                         if (mp->vlan_qos && !vlan_qos)
 234                                 vlan->nr_egress_mappings--;
 235                         else if (!mp->vlan_qos && vlan_qos)
 236                                 vlan->nr_egress_mappings++;
 237                         mp->vlan_qos = vlan_qos;
 238                         return 0;
 239                 }
 240                 mp = mp->next;
 241         }
 242
 243         /* Create a new mapping then. */
 244         mp = vlan->egress_priority_map[skb_prio & 0xF];
 245         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 246         if (!np)
 247                 return -ENOBUFS;
 248
 249         np->next = mp;
 250         np->priority = skb_prio;
 251         np->vlan_qos = vlan_qos;
 252         vlan->egress_priority_map[skb_prio & 0xF] = np;
 253         if (vlan_qos)
 254                 vlan->nr_egress_mappings++;
 255         return 0;
 256 }
 257
 258 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 259 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 260 {
 261         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 262         u32 old_flags = vlan->flags;
 263
 264         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 265                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 266                 return -EINVAL;
 267
 268         vlan->flags = (old_flags & ~mask) | (flags & mask);
 269
 270         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 271                 if (vlan->flags & VLAN_FLAG_GVRP)
 272                         vlan_gvrp_request_join(dev);
 273                 else
 274                         vlan_gvrp_request_leave(dev);
 275         }
 276
 277         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_MVRP) {
 278                 if (vlan->flags & VLAN_FLAG_MVRP)
 279                         vlan_mvrp_request_join(dev);
 280                 else
 281                         vlan_mvrp_request_leave(dev);
 282         }
 283         return 0;
 284 }
 285
 286 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 287 {
 288         strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 289 }
 290
 291 static int vlan_dev_open(struct net_device *dev)
 292 {
 293         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 294         struct net_device *real_dev = vlan->real_dev;
 295         int err;
 296
 297         if (!(real_dev->flags & IFF_UP) &&
 298             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 299                 return -ENETDOWN;
 300
 301         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
 302                 err = dev_uc_add(real_dev, dev->dev_addr);
 303                 if (err < 0)
 304                         goto out;
 305         }
 306
 307         if (dev->flags & IFF_ALLMULTI) {
 308                 err = dev_set_allmulti(real_dev, 1);
 309                 if (err < 0)
 310                         goto del_unicast;
 311         }
 312         if (dev->flags & IFF_PROMISC) {
 313                 err = dev_set_promiscuity(real_dev, 1);
 314                 if (err < 0)
 315                         goto clear_allmulti;
 316         }
 317
 318         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 319
 320         if (vlan->flags & VLAN_FLAG_GVRP)
 321                 vlan_gvrp_request_join(dev);
 322
 323         if (vlan->flags & VLAN_FLAG_MVRP)
 324                 vlan_mvrp_request_join(dev);
 325
 326         if (netif_carrier_ok(real_dev))
 327                 netif_carrier_on(dev);
 328         return 0;
 329
 330 clear_allmulti:
 331         if (dev->flags & IFF_ALLMULTI)
 332                 dev_set_allmulti(real_dev, -1);
 333 del_unicast:
 334         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 335                 dev_uc_del(real_dev, dev->dev_addr);
 336 out:
 337         netif_carrier_off(dev);
 338         return err;
 339 }
 340
 341 static int vlan_dev_stop(struct net_device *dev)
 342 {
 343         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 344         struct net_device *real_dev = vlan->real_dev;
 345
 346         dev_mc_unsync(real_dev, dev);
 347         dev_uc_unsync(real_dev, dev);
 348         if (dev->flags & IFF_ALLMULTI)
 349                 dev_set_allmulti(real_dev, -1);
 350         if (dev->flags & IFF_PROMISC)
 351                 dev_set_promiscuity(real_dev, -1);
 352
 353         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 354                 dev_uc_del(real_dev, dev->dev_addr);
 355
 356         netif_carrier_off(dev);
 357         return 0;
 358 }
 359
 360 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 361 {
 362         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 363         struct sockaddr *addr = p;
 364         int err;
 365
 366         if (!is_valid_ether_addr(addr->sa_data))
 367                 return -EADDRNOTAVAIL;
 368
 369         if (!(dev->flags & IFF_UP))
 370                 goto out;
 371
 372         if (!ether_addr_equal(addr->sa_data, real_dev->dev_addr)) {
 373                 err = dev_uc_add(real_dev, addr->sa_data);
 374                 if (err < 0)
 375                         return err;
 376         }
 377
 378         if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr))
 379                 dev_uc_del(real_dev, dev->dev_addr);
 380
 381 out:
 382         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 383         return 0;
 384 }
 385
 386 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 387 {
 388         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 389         const struct net_device_ops *ops = real_dev->netdev_ops;
 390         struct ifreq ifrr;
 391         int err = -EOPNOTSUPP;
 392
 393         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 394         ifrr.ifr_ifru = ifr->ifr_ifru;
 395
 396         switch (cmd) {
 397         case SIOCGMIIPHY:
 398         case SIOCGMIIREG:
 399         case SIOCSMIIREG:
 400                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 401                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 402                 break;
 403         }
 404
 405         if (!err)
 406                 ifr->ifr_ifru = ifrr.ifr_ifru;
 407
 408         return err;
 409 }
 410
 411 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 412 {
 413         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 414         const struct net_device_ops *ops = real_dev->netdev_ops;
 415         int err = 0;
 416
 417         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 418                 err = ops->ndo_neigh_setup(real_dev, pa);
 419
 420         return err;
 421 }
 422
 423 #if IS_ENABLED(CONFIG_FCOE)
 424 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 425                                    struct scatterlist *sgl, unsigned int sgc)
 426 {
 427         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 428         const struct net_device_ops *ops = real_dev->netdev_ops;
 429         int rc = 0;
 430
 431         if (ops->ndo_fcoe_ddp_setup)
 432                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 433
 434         return rc;
 435 }
 436
 437 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 438 {
 439         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 440         const struct net_device_ops *ops = real_dev->netdev_ops;
 441         int len = 0;
 442
 443         if (ops->ndo_fcoe_ddp_done)
 444                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 445
 446         return len;
 447 }
 448
 449 static int vlan_dev_fcoe_enable(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_enable)
 456                 rc = ops->ndo_fcoe_enable(real_dev);
 457         return rc;
 458 }
 459
 460 static int vlan_dev_fcoe_disable(struct net_device *dev)
 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_disable)
 467                 rc = ops->ndo_fcoe_disable(real_dev);
 468         return rc;
 469 }
 470
 471 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 472 {
 473         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 474         const struct net_device_ops *ops = real_dev->netdev_ops;
 475         int rc = -EINVAL;
 476
 477         if (ops->ndo_fcoe_get_wwn)
 478                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 479         return rc;
 480 }
 481
 482 static int vlan_dev_fcoe_ddp_target(struct net_device *dev, u16 xid,
 483                                     struct scatterlist *sgl, unsigned int sgc)
 484 {
 485         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 486         const struct net_device_ops *ops = real_dev->netdev_ops;
 487         int rc = 0;
 488
 489         if (ops->ndo_fcoe_ddp_target)
 490                 rc = ops->ndo_fcoe_ddp_target(real_dev, xid, sgl, sgc);
 491
 492         return rc;
 493 }
 494 #endif
 495
 496 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 497 {
 498         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 499
 500         if (dev->flags & IFF_UP) {
 501                 if (change & IFF_ALLMULTI)
 502                         dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 503                 if (change & IFF_PROMISC)
 504                         dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 505         }
 506 }
 507
 508 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 509 {
 510         dev_mc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 511         dev_uc_sync(vlan_dev_priv(vlan_dev)->real_dev, vlan_dev);
 512 }
 513
 514 /*
 515  * vlan network devices have devices nesting below it, and are a special
 516  * "super class" of normal network devices; split their locks off into a
 517  * separate class since they always nest.
 518  */
 519 static struct lock_class_key vlan_netdev_xmit_lock_key;
 520 static struct lock_class_key vlan_netdev_addr_lock_key;
 521
 522 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 523                                      struct netdev_queue *txq,
 524                                      void *_subclass)
 525 {
 526         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 527                                        &vlan_netdev_xmit_lock_key,
 528                                        *(int *)_subclass);
 529 }
 530
 531 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 532 {
 533         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 534                                        &vlan_netdev_addr_lock_key,
 535                                        subclass);
 536         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 537 }
 538
 539 static const struct header_ops vlan_header_ops = {
 540         .create  = vlan_dev_hard_header,
 541         .rebuild = vlan_dev_rebuild_header,
 542         .parse   = eth_header_parse,
 543 };
 544
 545 static struct device_type vlan_type = {
 546         .name   = "vlan",
 547 };
 548
 549 static const struct net_device_ops vlan_netdev_ops;
 550
 551 static int vlan_dev_init(struct net_device *dev)
 552 {
 553         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 554         int subclass = 0;
 555
 556         netif_carrier_off(dev);
 557
 558         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 559         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 560                                           IFF_MASTER | IFF_SLAVE);
 561         dev->iflink = real_dev->ifindex;
 562         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 563                                           (1<<__LINK_STATE_DORMANT))) |
 564                       (1<<__LINK_STATE_PRESENT);
 565
 566         dev->hw_features = NETIF_F_ALL_CSUM | NETIF_F_SG |
 567                            NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |
 568                            NETIF_F_HIGHDMA | NETIF_F_SCTP_CSUM |
 569                            NETIF_F_ALL_FCOE;
 570
 571         dev->features |= real_dev->vlan_features | NETIF_F_LLTX;
 572         dev->gso_max_size = real_dev->gso_max_size;
 573
 574         /* ipv6 shared card related stuff */
 575         dev->dev_id = real_dev->dev_id;
 576
 577         if (is_zero_ether_addr(dev->dev_addr))
 578                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 579         if (is_zero_ether_addr(dev->broadcast))
 580                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 581
 582 #if IS_ENABLED(CONFIG_FCOE)
 583         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 584 #endif
 585
 586         dev->needed_headroom = real_dev->needed_headroom;
 587         if (real_dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
 588                 dev->header_ops      = real_dev->header_ops;
 589                 dev->hard_header_len = real_dev->hard_header_len;
 590         } else {
 591                 dev->header_ops      = &vlan_header_ops;
 592                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 593         }
 594
 595         dev->netdev_ops = &vlan_netdev_ops;
 596
 597         SET_NETDEV_DEVTYPE(dev, &vlan_type);
 598
 599         if (is_vlan_dev(real_dev))
 600                 subclass = 1;
 601
 602         vlan_dev_set_lockdep_class(dev, subclass);
 603
 604         vlan_dev_priv(dev)->vlan_pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
 605         if (!vlan_dev_priv(dev)->vlan_pcpu_stats)
 606                 return -ENOMEM;
 607
 608         return 0;
 609 }
 610
 611 static void vlan_dev_uninit(struct net_device *dev)
 612 {
 613         struct vlan_priority_tci_mapping *pm;
 614         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 615         int i;
 616
 617         free_percpu(vlan->vlan_pcpu_stats);
 618         vlan->vlan_pcpu_stats = NULL;
 619         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 620                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 621                         vlan->egress_priority_map[i] = pm->next;
 622                         kfree(pm);
 623                 }
 624         }
 625 }
 626
 627 static netdev_features_t vlan_dev_fix_features(struct net_device *dev,
 628         netdev_features_t features)
 629 {
 630         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 631         netdev_features_t old_features = features;
 632
 633         features &= real_dev->vlan_features;
 634         features |= NETIF_F_RXCSUM;
 635         features &= real_dev->features;
 636
 637         features |= old_features & NETIF_F_SOFT_FEATURES;
 638         features |= NETIF_F_LLTX;
 639
 640         return features;
 641 }
 642
 643 static int vlan_ethtool_get_settings(struct net_device *dev,
 644                                      struct ethtool_cmd *cmd)
 645 {
 646         const struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 647
 648         return __ethtool_get_settings(vlan->real_dev, cmd);
 649 }
 650
 651 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 652                                      struct ethtool_drvinfo *info)
 653 {
 654         strlcpy(info->driver, vlan_fullname, sizeof(info->driver));
 655         strlcpy(info->version, vlan_version, sizeof(info->version));
 656         strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
 657 }
 658
 659 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 660 {
 661
 662         if (vlan_dev_priv(dev)->vlan_pcpu_stats) {
 663                 struct vlan_pcpu_stats *p;
 664                 u32 rx_errors = 0, tx_dropped = 0;
 665                 int i;
 666
 667                 for_each_possible_cpu(i) {
 668                         u64 rxpackets, rxbytes, rxmulticast, txpackets, txbytes;
 669                         unsigned int start;
 670
 671                         p = per_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats, i);
 672                         do {
 673                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 674                                 rxpackets       = p->rx_packets;
 675                                 rxbytes         = p->rx_bytes;
 676                                 rxmulticast     = p->rx_multicast;
 677                                 txpackets       = p->tx_packets;
 678                                 txbytes         = p->tx_bytes;
 679                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 680
 681                         stats->rx_packets       += rxpackets;
 682                         stats->rx_bytes         += rxbytes;
 683                         stats->multicast        += rxmulticast;
 684                         stats->tx_packets       += txpackets;
 685                         stats->tx_bytes         += txbytes;
 686                         /* rx_errors & tx_dropped are u32 */
 687                         rx_errors       += p->rx_errors;
 688                         tx_dropped      += p->tx_dropped;
 689                 }
 690                 stats->rx_errors  = rx_errors;
 691                 stats->tx_dropped = tx_dropped;
 692         }
 693         return stats;
 694 }
 695
 696 #ifdef CONFIG_NET_POLL_CONTROLLER
 697 static void vlan_dev_poll_controller(struct net_device *dev)
 698 {
 699         return;
 700 }
 701
 702 static int vlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo,
 703                                   gfp_t gfp)
 704 {
 705         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 706         struct net_device *real_dev = vlan->real_dev;
 707         struct netpoll *netpoll;
 708         int err = 0;
 709
 710         netpoll = kzalloc(sizeof(*netpoll), gfp);
 711         err = -ENOMEM;
 712         if (!netpoll)
 713                 goto out;
 714
 715         err = __netpoll_setup(netpoll, real_dev, gfp);
 716         if (err) {
 717                 kfree(netpoll);
 718                 goto out;
 719         }
 720
 721         vlan->netpoll = netpoll;
 722
 723 out:
 724         return err;
 725 }
 726
 727 static void vlan_dev_netpoll_cleanup(struct net_device *dev)
 728 {
 729         struct vlan_dev_priv *vlan= vlan_dev_priv(dev);
 730         struct netpoll *netpoll = vlan->netpoll;
 731
 732         if (!netpoll)
 733                 return;
 734
 735         vlan->netpoll = NULL;
 736
 737         __netpoll_free_async(netpoll);
 738 }
 739 #endif /* CONFIG_NET_POLL_CONTROLLER */
 740
 741 static const struct ethtool_ops vlan_ethtool_ops = {
 742         .get_settings           = vlan_ethtool_get_settings,
 743         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 744         .get_link               = ethtool_op_get_link,
 745 };
 746
 747 static const struct net_device_ops vlan_netdev_ops = {
 748         .ndo_change_mtu         = vlan_dev_change_mtu,
 749         .ndo_init               = vlan_dev_init,
 750         .ndo_uninit             = vlan_dev_uninit,
 751         .ndo_open               = vlan_dev_open,
 752         .ndo_stop               = vlan_dev_stop,
 753         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 754         .ndo_validate_addr      = eth_validate_addr,
 755         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 756         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 757         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 758         .ndo_do_ioctl           = vlan_dev_ioctl,
 759         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 760         .ndo_get_stats64        = vlan_dev_get_stats64,
 761 #if IS_ENABLED(CONFIG_FCOE)
 762         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 763         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 764         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 765         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 766         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 767         .ndo_fcoe_ddp_target    = vlan_dev_fcoe_ddp_target,
 768 #endif
 769 #ifdef CONFIG_NET_POLL_CONTROLLER
 770         .ndo_poll_controller    = vlan_dev_poll_controller,
 771         .ndo_netpoll_setup      = vlan_dev_netpoll_setup,
 772         .ndo_netpoll_cleanup    = vlan_dev_netpoll_cleanup,
 773 #endif
 774         .ndo_fix_features       = vlan_dev_fix_features,
 775 };
 776
 777 void vlan_setup(struct net_device *dev)
 778 {
 779         ether_setup(dev);
 780
 781         dev->priv_flags         |= IFF_802_1Q_VLAN;
 782         dev->priv_flags         &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 783         dev->tx_queue_len       = 0;
 784
 785         dev->netdev_ops         = &vlan_netdev_ops;
 786         dev->destructor         = free_netdev;
 787         dev->ethtool_ops        = &vlan_ethtool_ops;
 788
 789         memset(dev->broadcast, 0, ETH_ALEN);
 790 }