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   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 #include <linux/module.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/ethtool.h>
  28 #include <net/arp.h>
  29
  30 #include "vlan.h"
  31 #include "vlanproc.h"
  32 #include <linux/if_vlan.h>
  33
  34 /*
  35  *      Rebuild the Ethernet MAC header. This is called after an ARP
  36  *      (or in future other address resolution) has completed on this
  37  *      sk_buff. We now let ARP fill in the other fields.
  38  *
  39  *      This routine CANNOT use cached dst->neigh!
  40  *      Really, it is used only when dst->neigh is wrong.
  41  *
  42  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  43  */
  44 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  45 {
  46         struct net_device *dev = skb->dev;
  47         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  48
  49         switch (veth->h_vlan_encapsulated_proto) {
  50 #ifdef CONFIG_INET
  51         case htons(ETH_P_IP):
  52
  53                 /* TODO:  Confirm this will work with VLAN headers... */
  54                 return arp_find(veth->h_dest, skb);
  55 #endif
  56         default:
  57                 pr_debug("%s: unable to resolve type %X addresses.\n",
  58                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  59
  60                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  61                 break;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
  68 {
  69         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
  70                 if (skb_cow(skb, skb_headroom(skb)) < 0)
  71                         skb = NULL;
  72                 if (skb) {
  73                         /* Lifted from Gleb's VLAN code... */
  74                         memmove(skb->data - ETH_HLEN,
  75                                 skb->data - VLAN_ETH_HLEN, 12);
  76                         skb->mac_header += VLAN_HLEN;
  77                 }
  78         }
  79
  80         return skb;
  81 }
  82
  83 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  84                 struct vlan_hdr *vhdr)
  85 {
  86         __be16 proto;
  87         unsigned char *rawp;
  88
  89         /*
  90          * Was a VLAN packet, grab the encapsulated protocol, which the layer
  91          * three protocols care about.
  92          */
  93
  94         proto = vhdr->h_vlan_encapsulated_proto;
  95         if (ntohs(proto) >= 1536) {
  96                 skb->protocol = proto;
  97                 return;
  98         }
  99
 100         rawp = skb->data;
 101         if (*(unsigned short *)rawp == 0xFFFF)
 102                 /*
 103                  * This is a magic hack to spot IPX packets. Older Novell
 104                  * breaks the protocol design and runs IPX over 802.3 without
 105                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 106                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 107                  * but does for the rest.
 108                  */
 109                 skb->protocol = htons(ETH_P_802_3);
 110         else
 111                 /*
 112                  * Real 802.2 LLC
 113                  */
 114                 skb->protocol = htons(ETH_P_802_2);
 115 }
 116
 117 /*
 118  *      Determine the packet's protocol ID. The rule here is that we
 119  *      assume 802.3 if the type field is short enough to be a length.
 120  *      This is normal practice and works for any 'now in use' protocol.
 121  *
 122  *  Also, at this point we assume that we ARE dealing exclusively with
 123  *  VLAN packets, or packets that should be made into VLAN packets based
 124  *  on a default VLAN ID.
 125  *
 126  *  NOTE:  Should be similar to ethernet/eth.c.
 127  *
 128  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 129  *                towards userland.  To get here, it would have already passed
 130  *                through the ethernet/eth.c eth_type_trans() method.
 131  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 132  *                 stored UNALIGNED in the memory.  RISC systems don't like
 133  *                 such cases very much...
 134  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 135  *                  aligned, so there doesn't need to be any of the unaligned
 136  *                  stuff.  It has been commented out now...  --Ben
 137  *
 138  */
 139 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 140                   struct packet_type *ptype, struct net_device *orig_dev)
 141 {
 142         struct vlan_hdr *vhdr;
 143         struct vlan_rx_stats *rx_stats;
 144         u16 vlan_id;
 145         u16 vlan_tci;
 146
 147         skb = skb_share_check(skb, GFP_ATOMIC);
 148         if (skb == NULL)
 149                 goto err_free;
 150
 151         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 152                 goto err_free;
 153
 154         vhdr = (struct vlan_hdr *)skb->data;
 155         vlan_tci = ntohs(vhdr->h_vlan_TCI);
 156         vlan_id = vlan_tci & VLAN_VID_MASK;
 157
 158         rcu_read_lock();
 159         skb->dev = __find_vlan_dev(dev, vlan_id);
 160         if (!skb->dev) {
 161                 pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 162                          __func__, vlan_id, dev->name);
 163                 goto err_unlock;
 164         }
 165
 166         rx_stats = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
 167                                smp_processor_id());
 168         rx_stats->rx_packets++;
 169         rx_stats->rx_bytes += skb->len;
 170
 171         skb_pull_rcsum(skb, VLAN_HLEN);
 172
 173         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 174
 175         pr_debug("%s: priority: %u for TCI: %hu\n",
 176                  __func__, skb->priority, vlan_tci);
 177
 178         switch (skb->pkt_type) {
 179         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 180                 /* stats->broadcast ++; // no such counter :-( */
 181                 break;
 182
 183         case PACKET_MULTICAST:
 184                 rx_stats->multicast++;
 185                 break;
 186
 187         case PACKET_OTHERHOST:
 188                 /* Our lower layer thinks this is not local, let's make sure.
 189                  * This allows the VLAN to have a different MAC than the
 190                  * underlying device, and still route correctly.
 191                  */
 192                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 193                                         skb->dev->dev_addr))
 194                         skb->pkt_type = PACKET_HOST;
 195                 break;
 196         default:
 197                 break;
 198         }
 199
 200         vlan_set_encap_proto(skb, vhdr);
 201
 202         skb = vlan_check_reorder_header(skb);
 203         if (!skb) {
 204                 rx_stats->rx_errors++;
 205                 goto err_unlock;
 206         }
 207
 208         netif_rx(skb);
 209         rcu_read_unlock();
 210         return NET_RX_SUCCESS;
 211
 212 err_unlock:
 213         rcu_read_unlock();
 214 err_free:
 215         kfree_skb(skb);
 216         return NET_RX_DROP;
 217 }
 218
 219 static inline u16
 220 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 221 {
 222         struct vlan_priority_tci_mapping *mp;
 223
 224         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 225         while (mp) {
 226                 if (mp->priority == skb->priority) {
 227                         return mp->vlan_qos; /* This should already be shifted
 228                                               * to mask correctly with the
 229                                               * VLAN's TCI */
 230                 }
 231                 mp = mp->next;
 232         }
 233         return 0;
 234 }
 235
 236 /*
 237  *      Create the VLAN header for an arbitrary protocol layer
 238  *
 239  *      saddr=NULL      means use device source address
 240  *      daddr=NULL      means leave destination address (eg unresolved arp)
 241  *
 242  *  This is called when the SKB is moving down the stack towards the
 243  *  physical devices.
 244  */
 245 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 246                                 unsigned short type,
 247                                 const void *daddr, const void *saddr,
 248                                 unsigned int len)
 249 {
 250         struct vlan_hdr *vhdr;
 251         unsigned int vhdrlen = 0;
 252         u16 vlan_tci = 0;
 253         int rc;
 254
 255         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 256                 return -ENOSPC;
 257
 258         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 259                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 260
 261                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 262                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 263                 vhdr->h_vlan_TCI = htons(vlan_tci);
 264
 265                 /*
 266                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 267                  *  put the length in here instead.
 268                  */
 269                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 270                         vhdr->h_vlan_encapsulated_proto = htons(type);
 271                 else
 272                         vhdr->h_vlan_encapsulated_proto = htons(len);
 273
 274                 skb->protocol = htons(ETH_P_8021Q);
 275                 type = ETH_P_8021Q;
 276                 vhdrlen = VLAN_HLEN;
 277         }
 278
 279         /* Before delegating work to the lower layer, enter our MAC-address */
 280         if (saddr == NULL)
 281                 saddr = dev->dev_addr;
 282
 283         /* Now make the underlying real hard header */
 284         dev = vlan_dev_info(dev)->real_dev;
 285         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 286         if (rc > 0)
 287                 rc += vhdrlen;
 288         return rc;
 289 }
 290
 291 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 292                                             struct net_device *dev)
 293 {
 294         int i = skb_get_queue_mapping(skb);
 295         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 296         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 297         unsigned int len;
 298         int ret;
 299
 300         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 301          *
 302          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 303          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 304          */
 305         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 306             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 307                 unsigned int orig_headroom = skb_headroom(skb);
 308                 u16 vlan_tci;
 309
 310                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 311
 312                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 313                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 314                 skb = __vlan_put_tag(skb, vlan_tci);
 315                 if (!skb) {
 316                         txq->tx_dropped++;
 317                         return NETDEV_TX_OK;
 318                 }
 319
 320                 if (orig_headroom < VLAN_HLEN)
 321                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 322         }
 323
 324
 325         skb->dev = vlan_dev_info(dev)->real_dev;
 326         len = skb->len;
 327         ret = dev_queue_xmit(skb);
 328
 329         if (likely(ret == NET_XMIT_SUCCESS)) {
 330                 txq->tx_packets++;
 331                 txq->tx_bytes += len;
 332         } else
 333                 txq->tx_dropped++;
 334
 335         return ret;
 336 }
 337
 338 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 339                                                     struct net_device *dev)
 340 {
 341         int i = skb_get_queue_mapping(skb);
 342         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 343         u16 vlan_tci;
 344         unsigned int len;
 345         int ret;
 346
 347         vlan_tci = vlan_dev_info(dev)->vlan_id;
 348         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 349         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 350
 351         skb->dev = vlan_dev_info(dev)->real_dev;
 352         len = skb->len;
 353         ret = dev_queue_xmit(skb);
 354
 355         if (likely(ret == NET_XMIT_SUCCESS)) {
 356                 txq->tx_packets++;
 357                 txq->tx_bytes += len;
 358         } else
 359                 txq->tx_dropped++;
 360
 361         return ret;
 362 }
 363
 364 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 365 {
 366         /* TODO: gotta make sure the underlying layer can handle it,
 367          * maybe an IFF_VLAN_CAPABLE flag for devices?
 368          */
 369         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 370                 return -ERANGE;
 371
 372         dev->mtu = new_mtu;
 373
 374         return 0;
 375 }
 376
 377 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 378                                    u32 skb_prio, u16 vlan_prio)
 379 {
 380         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 381
 382         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 383                 vlan->nr_ingress_mappings--;
 384         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 385                 vlan->nr_ingress_mappings++;
 386
 387         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 388 }
 389
 390 int vlan_dev_set_egress_priority(const struct net_device *dev,
 391                                  u32 skb_prio, u16 vlan_prio)
 392 {
 393         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 394         struct vlan_priority_tci_mapping *mp = NULL;
 395         struct vlan_priority_tci_mapping *np;
 396         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 397
 398         /* See if a priority mapping exists.. */
 399         mp = vlan->egress_priority_map[skb_prio & 0xF];
 400         while (mp) {
 401                 if (mp->priority == skb_prio) {
 402                         if (mp->vlan_qos && !vlan_qos)
 403                                 vlan->nr_egress_mappings--;
 404                         else if (!mp->vlan_qos && vlan_qos)
 405                                 vlan->nr_egress_mappings++;
 406                         mp->vlan_qos = vlan_qos;
 407                         return 0;
 408                 }
 409                 mp = mp->next;
 410         }
 411
 412         /* Create a new mapping then. */
 413         mp = vlan->egress_priority_map[skb_prio & 0xF];
 414         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 415         if (!np)
 416                 return -ENOBUFS;
 417
 418         np->next = mp;
 419         np->priority = skb_prio;
 420         np->vlan_qos = vlan_qos;
 421         vlan->egress_priority_map[skb_prio & 0xF] = np;
 422         if (vlan_qos)
 423                 vlan->nr_egress_mappings++;
 424         return 0;
 425 }
 426
 427 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 428 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 429 {
 430         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 431         u32 old_flags = vlan->flags;
 432
 433         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 434                      VLAN_FLAG_LOOSE_BINDING))
 435                 return -EINVAL;
 436
 437         vlan->flags = (old_flags & ~mask) | (flags & mask);
 438
 439         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 440                 if (vlan->flags & VLAN_FLAG_GVRP)
 441                         vlan_gvrp_request_join(dev);
 442                 else
 443                         vlan_gvrp_request_leave(dev);
 444         }
 445         return 0;
 446 }
 447
 448 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 449 {
 450         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 451 }
 452
 453 static int vlan_dev_open(struct net_device *dev)
 454 {
 455         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 456         struct net_device *real_dev = vlan->real_dev;
 457         int err;
 458
 459         if (!(real_dev->flags & IFF_UP) &&
 460             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 461                 return -ENETDOWN;
 462
 463         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 464                 err = dev_unicast_add(real_dev, dev->dev_addr);
 465                 if (err < 0)
 466                         goto out;
 467         }
 468
 469         if (dev->flags & IFF_ALLMULTI) {
 470                 err = dev_set_allmulti(real_dev, 1);
 471                 if (err < 0)
 472                         goto del_unicast;
 473         }
 474         if (dev->flags & IFF_PROMISC) {
 475                 err = dev_set_promiscuity(real_dev, 1);
 476                 if (err < 0)
 477                         goto clear_allmulti;
 478         }
 479
 480         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 481
 482         if (vlan->flags & VLAN_FLAG_GVRP)
 483                 vlan_gvrp_request_join(dev);
 484
 485         netif_carrier_on(dev);
 486         return 0;
 487
 488 clear_allmulti:
 489         if (dev->flags & IFF_ALLMULTI)
 490                 dev_set_allmulti(real_dev, -1);
 491 del_unicast:
 492         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 493                 dev_unicast_delete(real_dev, dev->dev_addr);
 494 out:
 495         netif_carrier_off(dev);
 496         return err;
 497 }
 498
 499 static int vlan_dev_stop(struct net_device *dev)
 500 {
 501         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 502         struct net_device *real_dev = vlan->real_dev;
 503
 504         if (vlan->flags & VLAN_FLAG_GVRP)
 505                 vlan_gvrp_request_leave(dev);
 506
 507         dev_mc_unsync(real_dev, dev);
 508         dev_unicast_unsync(real_dev, dev);
 509         if (dev->flags & IFF_ALLMULTI)
 510                 dev_set_allmulti(real_dev, -1);
 511         if (dev->flags & IFF_PROMISC)
 512                 dev_set_promiscuity(real_dev, -1);
 513
 514         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 515                 dev_unicast_delete(real_dev, dev->dev_addr);
 516
 517         netif_carrier_off(dev);
 518         return 0;
 519 }
 520
 521 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 522 {
 523         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 524         struct sockaddr *addr = p;
 525         int err;
 526
 527         if (!is_valid_ether_addr(addr->sa_data))
 528                 return -EADDRNOTAVAIL;
 529
 530         if (!(dev->flags & IFF_UP))
 531                 goto out;
 532
 533         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 534                 err = dev_unicast_add(real_dev, addr->sa_data);
 535                 if (err < 0)
 536                         return err;
 537         }
 538
 539         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 540                 dev_unicast_delete(real_dev, dev->dev_addr);
 541
 542 out:
 543         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 544         return 0;
 545 }
 546
 547 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 548 {
 549         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 550         const struct net_device_ops *ops = real_dev->netdev_ops;
 551         struct ifreq ifrr;
 552         int err = -EOPNOTSUPP;
 553
 554         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 555         ifrr.ifr_ifru = ifr->ifr_ifru;
 556
 557         switch (cmd) {
 558         case SIOCGMIIPHY:
 559         case SIOCGMIIREG:
 560         case SIOCSMIIREG:
 561                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 562                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 563                 break;
 564         }
 565
 566         if (!err)
 567                 ifr->ifr_ifru = ifrr.ifr_ifru;
 568
 569         return err;
 570 }
 571
 572 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 573 {
 574         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 575         const struct net_device_ops *ops = real_dev->netdev_ops;
 576         int err = 0;
 577
 578         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 579                 err = ops->ndo_neigh_setup(real_dev, pa);
 580
 581         return err;
 582 }
 583
 584 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 585 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 586                                    struct scatterlist *sgl, unsigned int sgc)
 587 {
 588         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 589         const struct net_device_ops *ops = real_dev->netdev_ops;
 590         int rc = 0;
 591
 592         if (ops->ndo_fcoe_ddp_setup)
 593                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 594
 595         return rc;
 596 }
 597
 598 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 599 {
 600         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 601         const struct net_device_ops *ops = real_dev->netdev_ops;
 602         int len = 0;
 603
 604         if (ops->ndo_fcoe_ddp_done)
 605                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 606
 607         return len;
 608 }
 609
 610 static int vlan_dev_fcoe_enable(struct net_device *dev)
 611 {
 612         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 613         const struct net_device_ops *ops = real_dev->netdev_ops;
 614         int rc = -EINVAL;
 615
 616         if (ops->ndo_fcoe_enable)
 617                 rc = ops->ndo_fcoe_enable(real_dev);
 618         return rc;
 619 }
 620
 621 static int vlan_dev_fcoe_disable(struct net_device *dev)
 622 {
 623         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 624         const struct net_device_ops *ops = real_dev->netdev_ops;
 625         int rc = -EINVAL;
 626
 627         if (ops->ndo_fcoe_disable)
 628                 rc = ops->ndo_fcoe_disable(real_dev);
 629         return rc;
 630 }
 631
 632 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 633 {
 634         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 635         const struct net_device_ops *ops = real_dev->netdev_ops;
 636         int rc = -EINVAL;
 637
 638         if (ops->ndo_fcoe_get_wwn)
 639                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 640         return rc;
 641 }
 642 #endif
 643
 644 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 645 {
 646         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 647
 648         if (change & IFF_ALLMULTI)
 649                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 650         if (change & IFF_PROMISC)
 651                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 652 }
 653
 654 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 655 {
 656         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 657         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 658 }
 659
 660 /*
 661  * vlan network devices have devices nesting below it, and are a special
 662  * "super class" of normal network devices; split their locks off into a
 663  * separate class since they always nest.
 664  */
 665 static struct lock_class_key vlan_netdev_xmit_lock_key;
 666 static struct lock_class_key vlan_netdev_addr_lock_key;
 667
 668 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 669                                      struct netdev_queue *txq,
 670                                      void *_subclass)
 671 {
 672         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 673                                        &vlan_netdev_xmit_lock_key,
 674                                        *(int *)_subclass);
 675 }
 676
 677 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 678 {
 679         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 680                                        &vlan_netdev_addr_lock_key,
 681                                        subclass);
 682         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 683 }
 684
 685 static const struct header_ops vlan_header_ops = {
 686         .create  = vlan_dev_hard_header,
 687         .rebuild = vlan_dev_rebuild_header,
 688         .parse   = eth_header_parse,
 689 };
 690
 691 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
 692
 693 static int vlan_dev_init(struct net_device *dev)
 694 {
 695         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 696         int subclass = 0;
 697
 698         netif_carrier_off(dev);
 699
 700         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 701         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 702         dev->iflink = real_dev->ifindex;
 703         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 704                                           (1<<__LINK_STATE_DORMANT))) |
 705                       (1<<__LINK_STATE_PRESENT);
 706
 707         dev->features |= real_dev->features & real_dev->vlan_features;
 708         dev->gso_max_size = real_dev->gso_max_size;
 709
 710         /* ipv6 shared card related stuff */
 711         dev->dev_id = real_dev->dev_id;
 712
 713         if (is_zero_ether_addr(dev->dev_addr))
 714                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 715         if (is_zero_ether_addr(dev->broadcast))
 716                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 717
 718 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 719         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 720 #endif
 721
 722         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 723                 dev->header_ops      = real_dev->header_ops;
 724                 dev->hard_header_len = real_dev->hard_header_len;
 725                 dev->netdev_ops         = &vlan_netdev_accel_ops;
 726         } else {
 727                 dev->header_ops      = &vlan_header_ops;
 728                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 729                 dev->netdev_ops         = &vlan_netdev_ops;
 730         }
 731
 732         if (is_vlan_dev(real_dev))
 733                 subclass = 1;
 734
 735         vlan_dev_set_lockdep_class(dev, subclass);
 736
 737         vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats);
 738         if (!vlan_dev_info(dev)->vlan_rx_stats)
 739                 return -ENOMEM;
 740
 741         return 0;
 742 }
 743
 744 static void vlan_dev_uninit(struct net_device *dev)
 745 {
 746         struct vlan_priority_tci_mapping *pm;
 747         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 748         int i;
 749
 750         free_percpu(vlan->vlan_rx_stats);
 751         vlan->vlan_rx_stats = NULL;
 752         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 753                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 754                         vlan->egress_priority_map[i] = pm->next;
 755                         kfree(pm);
 756                 }
 757         }
 758 }
 759
 760 static int vlan_ethtool_get_settings(struct net_device *dev,
 761                                      struct ethtool_cmd *cmd)
 762 {
 763         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 764         return dev_ethtool_get_settings(vlan->real_dev, cmd);
 765 }
 766
 767 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 768                                      struct ethtool_drvinfo *info)
 769 {
 770         strcpy(info->driver, vlan_fullname);
 771         strcpy(info->version, vlan_version);
 772         strcpy(info->fw_version, "N/A");
 773 }
 774
 775 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 776 {
 777         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 778         return dev_ethtool_get_rx_csum(vlan->real_dev);
 779 }
 780
 781 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 782 {
 783         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 784         return dev_ethtool_get_flags(vlan->real_dev);
 785 }
 786
 787 static struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
 788 {
 789         struct net_device_stats *stats = &dev->stats;
 790
 791         dev_txq_stats_fold(dev, stats);
 792
 793         if (vlan_dev_info(dev)->vlan_rx_stats) {
 794                 struct vlan_rx_stats *p, rx = {0};
 795                 int i;
 796
 797                 for_each_possible_cpu(i) {
 798                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i);
 799                         rx.rx_packets += p->rx_packets;
 800                         rx.rx_bytes   += p->rx_bytes;
 801                         rx.rx_errors  += p->rx_errors;
 802                         rx.multicast  += p->multicast;
 803                 }
 804                 stats->rx_packets = rx.rx_packets;
 805                 stats->rx_bytes   = rx.rx_bytes;
 806                 stats->rx_errors  = rx.rx_errors;
 807                 stats->multicast  = rx.multicast;
 808         }
 809         return stats;
 810 }
 811
 812 static const struct ethtool_ops vlan_ethtool_ops = {
 813         .get_settings           = vlan_ethtool_get_settings,
 814         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 815         .get_link               = ethtool_op_get_link,
 816         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 817         .get_flags              = vlan_ethtool_get_flags,
 818 };
 819
 820 static const struct net_device_ops vlan_netdev_ops = {
 821         .ndo_change_mtu         = vlan_dev_change_mtu,
 822         .ndo_init               = vlan_dev_init,
 823         .ndo_uninit             = vlan_dev_uninit,
 824         .ndo_open               = vlan_dev_open,
 825         .ndo_stop               = vlan_dev_stop,
 826         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 827         .ndo_validate_addr      = eth_validate_addr,
 828         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 829         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 830         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 831         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 832         .ndo_do_ioctl           = vlan_dev_ioctl,
 833         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 834         .ndo_get_stats          = vlan_dev_get_stats,
 835 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 836         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 837         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 838         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 839         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 840         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 841 #endif
 842 };
 843
 844 static const struct net_device_ops vlan_netdev_accel_ops = {
 845         .ndo_change_mtu         = vlan_dev_change_mtu,
 846         .ndo_init               = vlan_dev_init,
 847         .ndo_uninit             = vlan_dev_uninit,
 848         .ndo_open               = vlan_dev_open,
 849         .ndo_stop               = vlan_dev_stop,
 850         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 851         .ndo_validate_addr      = eth_validate_addr,
 852         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 853         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 854         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 855         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 856         .ndo_do_ioctl           = vlan_dev_ioctl,
 857         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 858         .ndo_get_stats          = vlan_dev_get_stats,
 859 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 860         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 861         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 862         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 863         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 864         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 865 #endif
 866 };
 867
 868 void vlan_setup(struct net_device *dev)
 869 {
 870         ether_setup(dev);
 871
 872         dev->priv_flags         |= IFF_802_1Q_VLAN;
 873         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 874         dev->tx_queue_len       = 0;
 875
 876         dev->netdev_ops         = &vlan_netdev_ops;
 877         dev->destructor         = free_netdev;
 878         dev->ethtool_ops        = &vlan_ethtool_ops;
 879
 880         memset(dev->broadcast, 0, ETH_ALEN);
 881 }