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 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/ethtool.h>
  29 #include <net/arp.h>
  30
  31 #include "vlan.h"
  32 #include "vlanproc.h"
  33 #include <linux/if_vlan.h>
  34
  35 /*
  36  *      Rebuild the Ethernet MAC header. This is called after an ARP
  37  *      (or in future other address resolution) has completed on this
  38  *      sk_buff. We now let ARP fill in the other fields.
  39  *
  40  *      This routine CANNOT use cached dst->neigh!
  41  *      Really, it is used only when dst->neigh is wrong.
  42  *
  43  * TODO:  This needs a checkup, I'm ignorant here. --BLG
  44  */
  45 static int vlan_dev_rebuild_header(struct sk_buff *skb)
  46 {
  47         struct net_device *dev = skb->dev;
  48         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
  49
  50         switch (veth->h_vlan_encapsulated_proto) {
  51 #ifdef CONFIG_INET
  52         case htons(ETH_P_IP):
  53
  54                 /* TODO:  Confirm this will work with VLAN headers... */
  55                 return arp_find(veth->h_dest, skb);
  56 #endif
  57         default:
  58                 pr_debug("%s: unable to resolve type %X addresses.\n",
  59                          dev->name, ntohs(veth->h_vlan_encapsulated_proto));
  60
  61                 memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
  62                 break;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
  69 {
  70         if (vlan_dev_info(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
  71                 if (skb_cow(skb, skb_headroom(skb)) < 0)
  72                         skb = NULL;
  73                 if (skb) {
  74                         /* Lifted from Gleb's VLAN code... */
  75                         memmove(skb->data - ETH_HLEN,
  76                                 skb->data - VLAN_ETH_HLEN, 12);
  77                         skb->mac_header += VLAN_HLEN;
  78                 }
  79         }
  80
  81         return skb;
  82 }
  83
  84 static inline void vlan_set_encap_proto(struct sk_buff *skb,
  85                 struct vlan_hdr *vhdr)
  86 {
  87         __be16 proto;
  88         unsigned char *rawp;
  89
  90         /*
  91          * Was a VLAN packet, grab the encapsulated protocol, which the layer
  92          * three protocols care about.
  93          */
  94
  95         proto = vhdr->h_vlan_encapsulated_proto;
  96         if (ntohs(proto) >= 1536) {
  97                 skb->protocol = proto;
  98                 return;
  99         }
 100
 101         rawp = skb->data;
 102         if (*(unsigned short *)rawp == 0xFFFF)
 103                 /*
 104                  * This is a magic hack to spot IPX packets. Older Novell
 105                  * breaks the protocol design and runs IPX over 802.3 without
 106                  * an 802.2 LLC layer. We look for FFFF which isn't a used
 107                  * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
 108                  * but does for the rest.
 109                  */
 110                 skb->protocol = htons(ETH_P_802_3);
 111         else
 112                 /*
 113                  * Real 802.2 LLC
 114                  */
 115                 skb->protocol = htons(ETH_P_802_2);
 116 }
 117
 118 /*
 119  *      Determine the packet's protocol ID. The rule here is that we
 120  *      assume 802.3 if the type field is short enough to be a length.
 121  *      This is normal practice and works for any 'now in use' protocol.
 122  *
 123  *  Also, at this point we assume that we ARE dealing exclusively with
 124  *  VLAN packets, or packets that should be made into VLAN packets based
 125  *  on a default VLAN ID.
 126  *
 127  *  NOTE:  Should be similar to ethernet/eth.c.
 128  *
 129  *  SANITY NOTE:  This method is called when a packet is moving up the stack
 130  *                towards userland.  To get here, it would have already passed
 131  *                through the ethernet/eth.c eth_type_trans() method.
 132  *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
 133  *                 stored UNALIGNED in the memory.  RISC systems don't like
 134  *                 such cases very much...
 135  *  SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be
 136  *                  aligned, so there doesn't need to be any of the unaligned
 137  *                  stuff.  It has been commented out now...  --Ben
 138  *
 139  */
 140 int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
 141                   struct packet_type *ptype, struct net_device *orig_dev)
 142 {
 143         struct vlan_hdr *vhdr;
 144         struct vlan_rx_stats *rx_stats;
 145         struct net_device *vlan_dev;
 146         u16 vlan_id;
 147         u16 vlan_tci;
 148
 149         skb = skb_share_check(skb, GFP_ATOMIC);
 150         if (skb == NULL)
 151                 goto err_free;
 152
 153         if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
 154                 goto err_free;
 155
 156         vhdr = (struct vlan_hdr *)skb->data;
 157         vlan_tci = ntohs(vhdr->h_vlan_TCI);
 158         vlan_id = vlan_tci & VLAN_VID_MASK;
 159
 160         rcu_read_lock();
 161         vlan_dev = vlan_find_dev(dev, vlan_id);
 162
 163         /* If the VLAN device is defined, we use it.
 164          * If not, and the VID is 0, it is a 802.1p packet (not
 165          * really a VLAN), so we will just netif_rx it later to the
 166          * original interface, but with the skb->proto set to the
 167          * wrapped proto: we do nothing here.
 168          */
 169
 170         if (!vlan_dev) {
 171                 if (vlan_id) {
 172                         pr_debug("%s: ERROR: No net_device for VID: %u on dev: %s\n",
 173                                  __func__, vlan_id, dev->name);
 174                         goto err_unlock;
 175                 }
 176                 rx_stats = NULL;
 177         } else {
 178                 skb->dev = vlan_dev;
 179
 180                 rx_stats = this_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats);
 181
 182                 u64_stats_update_begin(&rx_stats->syncp);
 183                 rx_stats->rx_packets++;
 184                 rx_stats->rx_bytes += skb->len;
 185
 186                 skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 187
 188                 pr_debug("%s: priority: %u for TCI: %hu\n",
 189                          __func__, skb->priority, vlan_tci);
 190
 191                 switch (skb->pkt_type) {
 192                 case PACKET_BROADCAST:
 193                         /* Yeah, stats collect these together.. */
 194                         /* stats->broadcast ++; // no such counter :-( */
 195                         break;
 196
 197                 case PACKET_MULTICAST:
 198                         rx_stats->rx_multicast++;
 199                         break;
 200
 201                 case PACKET_OTHERHOST:
 202                         /* Our lower layer thinks this is not local, let's make
 203                          * sure.
 204                          * This allows the VLAN to have a different MAC than the
 205                          * underlying device, and still route correctly.
 206                          */
 207                         if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 208                                                 skb->dev->dev_addr))
 209                                 skb->pkt_type = PACKET_HOST;
 210                         break;
 211                 default:
 212                         break;
 213                 }
 214                 u64_stats_update_end(&rx_stats->syncp);
 215         }
 216
 217         skb_pull_rcsum(skb, VLAN_HLEN);
 218         vlan_set_encap_proto(skb, vhdr);
 219
 220         if (vlan_dev) {
 221                 skb = vlan_check_reorder_header(skb);
 222                 if (!skb) {
 223                         rx_stats->rx_errors++;
 224                         goto err_unlock;
 225                 }
 226         }
 227
 228         netif_rx(skb);
 229
 230         rcu_read_unlock();
 231         return NET_RX_SUCCESS;
 232
 233 err_unlock:
 234         rcu_read_unlock();
 235 err_free:
 236         atomic_long_inc(&dev->rx_dropped);
 237         kfree_skb(skb);
 238         return NET_RX_DROP;
 239 }
 240
 241 static inline u16
 242 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 243 {
 244         struct vlan_priority_tci_mapping *mp;
 245
 246         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 247         while (mp) {
 248                 if (mp->priority == skb->priority) {
 249                         return mp->vlan_qos; /* This should already be shifted
 250                                               * to mask correctly with the
 251                                               * VLAN's TCI */
 252                 }
 253                 mp = mp->next;
 254         }
 255         return 0;
 256 }
 257
 258 /*
 259  *      Create the VLAN header for an arbitrary protocol layer
 260  *
 261  *      saddr=NULL      means use device source address
 262  *      daddr=NULL      means leave destination address (eg unresolved arp)
 263  *
 264  *  This is called when the SKB is moving down the stack towards the
 265  *  physical devices.
 266  */
 267 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 268                                 unsigned short type,
 269                                 const void *daddr, const void *saddr,
 270                                 unsigned int len)
 271 {
 272         struct vlan_hdr *vhdr;
 273         unsigned int vhdrlen = 0;
 274         u16 vlan_tci = 0;
 275         int rc;
 276
 277         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 278                 return -ENOSPC;
 279
 280         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 281                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 282
 283                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 284                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 285                 vhdr->h_vlan_TCI = htons(vlan_tci);
 286
 287                 /*
 288                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 289                  *  put the length in here instead.
 290                  */
 291                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 292                         vhdr->h_vlan_encapsulated_proto = htons(type);
 293                 else
 294                         vhdr->h_vlan_encapsulated_proto = htons(len);
 295
 296                 skb->protocol = htons(ETH_P_8021Q);
 297                 type = ETH_P_8021Q;
 298                 vhdrlen = VLAN_HLEN;
 299         }
 300
 301         /* Before delegating work to the lower layer, enter our MAC-address */
 302         if (saddr == NULL)
 303                 saddr = dev->dev_addr;
 304
 305         /* Now make the underlying real hard header */
 306         dev = vlan_dev_info(dev)->real_dev;
 307         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 308         if (rc > 0)
 309                 rc += vhdrlen;
 310         return rc;
 311 }
 312
 313 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 314                                             struct net_device *dev)
 315 {
 316         int i = skb_get_queue_mapping(skb);
 317         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 318         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 319         unsigned int len;
 320         int ret;
 321
 322         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 323          *
 324          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 325          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 326          */
 327         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 328             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 329                 unsigned int orig_headroom = skb_headroom(skb);
 330                 u16 vlan_tci;
 331
 332                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 333
 334                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 335                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 336                 skb = __vlan_put_tag(skb, vlan_tci);
 337                 if (!skb) {
 338                         txq->tx_dropped++;
 339                         return NETDEV_TX_OK;
 340                 }
 341
 342                 if (orig_headroom < VLAN_HLEN)
 343                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 344         }
 345
 346
 347         skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
 348         len = skb->len;
 349         ret = dev_queue_xmit(skb);
 350
 351         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 352                 txq->tx_packets++;
 353                 txq->tx_bytes += len;
 354         } else
 355                 txq->tx_dropped++;
 356
 357         return ret;
 358 }
 359
 360 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 361                                                     struct net_device *dev)
 362 {
 363         int i = skb_get_queue_mapping(skb);
 364         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 365         u16 vlan_tci;
 366         unsigned int len;
 367         int ret;
 368
 369         vlan_tci = vlan_dev_info(dev)->vlan_id;
 370         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 371         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 372
 373         skb->dev = vlan_dev_info(dev)->real_dev;
 374         len = skb->len;
 375         ret = dev_queue_xmit(skb);
 376
 377         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 378                 txq->tx_packets++;
 379                 txq->tx_bytes += len;
 380         } else
 381                 txq->tx_dropped++;
 382
 383         return ret;
 384 }
 385
 386 static u16 vlan_dev_select_queue(struct net_device *dev, struct sk_buff *skb)
 387 {
 388         struct net_device *rdev = vlan_dev_info(dev)->real_dev;
 389         const struct net_device_ops *ops = rdev->netdev_ops;
 390
 391         return ops->ndo_select_queue(rdev, skb);
 392 }
 393
 394 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 395 {
 396         /* TODO: gotta make sure the underlying layer can handle it,
 397          * maybe an IFF_VLAN_CAPABLE flag for devices?
 398          */
 399         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 400                 return -ERANGE;
 401
 402         dev->mtu = new_mtu;
 403
 404         return 0;
 405 }
 406
 407 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 408                                    u32 skb_prio, u16 vlan_prio)
 409 {
 410         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 411
 412         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 413                 vlan->nr_ingress_mappings--;
 414         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 415                 vlan->nr_ingress_mappings++;
 416
 417         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 418 }
 419
 420 int vlan_dev_set_egress_priority(const struct net_device *dev,
 421                                  u32 skb_prio, u16 vlan_prio)
 422 {
 423         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 424         struct vlan_priority_tci_mapping *mp = NULL;
 425         struct vlan_priority_tci_mapping *np;
 426         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 427
 428         /* See if a priority mapping exists.. */
 429         mp = vlan->egress_priority_map[skb_prio & 0xF];
 430         while (mp) {
 431                 if (mp->priority == skb_prio) {
 432                         if (mp->vlan_qos && !vlan_qos)
 433                                 vlan->nr_egress_mappings--;
 434                         else if (!mp->vlan_qos && vlan_qos)
 435                                 vlan->nr_egress_mappings++;
 436                         mp->vlan_qos = vlan_qos;
 437                         return 0;
 438                 }
 439                 mp = mp->next;
 440         }
 441
 442         /* Create a new mapping then. */
 443         mp = vlan->egress_priority_map[skb_prio & 0xF];
 444         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 445         if (!np)
 446                 return -ENOBUFS;
 447
 448         np->next = mp;
 449         np->priority = skb_prio;
 450         np->vlan_qos = vlan_qos;
 451         vlan->egress_priority_map[skb_prio & 0xF] = np;
 452         if (vlan_qos)
 453                 vlan->nr_egress_mappings++;
 454         return 0;
 455 }
 456
 457 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 458 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 459 {
 460         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 461         u32 old_flags = vlan->flags;
 462
 463         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 464                      VLAN_FLAG_LOOSE_BINDING))
 465                 return -EINVAL;
 466
 467         vlan->flags = (old_flags & ~mask) | (flags & mask);
 468
 469         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 470                 if (vlan->flags & VLAN_FLAG_GVRP)
 471                         vlan_gvrp_request_join(dev);
 472                 else
 473                         vlan_gvrp_request_leave(dev);
 474         }
 475         return 0;
 476 }
 477
 478 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 479 {
 480         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 481 }
 482
 483 static int vlan_dev_open(struct net_device *dev)
 484 {
 485         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 486         struct net_device *real_dev = vlan->real_dev;
 487         int err;
 488
 489         if (!(real_dev->flags & IFF_UP) &&
 490             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 491                 return -ENETDOWN;
 492
 493         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 494                 err = dev_uc_add(real_dev, dev->dev_addr);
 495                 if (err < 0)
 496                         goto out;
 497         }
 498
 499         if (dev->flags & IFF_ALLMULTI) {
 500                 err = dev_set_allmulti(real_dev, 1);
 501                 if (err < 0)
 502                         goto del_unicast;
 503         }
 504         if (dev->flags & IFF_PROMISC) {
 505                 err = dev_set_promiscuity(real_dev, 1);
 506                 if (err < 0)
 507                         goto clear_allmulti;
 508         }
 509
 510         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 511
 512         if (vlan->flags & VLAN_FLAG_GVRP)
 513                 vlan_gvrp_request_join(dev);
 514
 515         if (netif_carrier_ok(real_dev))
 516                 netif_carrier_on(dev);
 517         return 0;
 518
 519 clear_allmulti:
 520         if (dev->flags & IFF_ALLMULTI)
 521                 dev_set_allmulti(real_dev, -1);
 522 del_unicast:
 523         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 524                 dev_uc_del(real_dev, dev->dev_addr);
 525 out:
 526         netif_carrier_off(dev);
 527         return err;
 528 }
 529
 530 static int vlan_dev_stop(struct net_device *dev)
 531 {
 532         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 533         struct net_device *real_dev = vlan->real_dev;
 534
 535         if (vlan->flags & VLAN_FLAG_GVRP)
 536                 vlan_gvrp_request_leave(dev);
 537
 538         dev_mc_unsync(real_dev, dev);
 539         dev_uc_unsync(real_dev, dev);
 540         if (dev->flags & IFF_ALLMULTI)
 541                 dev_set_allmulti(real_dev, -1);
 542         if (dev->flags & IFF_PROMISC)
 543                 dev_set_promiscuity(real_dev, -1);
 544
 545         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 546                 dev_uc_del(real_dev, dev->dev_addr);
 547
 548         netif_carrier_off(dev);
 549         return 0;
 550 }
 551
 552 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 553 {
 554         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 555         struct sockaddr *addr = p;
 556         int err;
 557
 558         if (!is_valid_ether_addr(addr->sa_data))
 559                 return -EADDRNOTAVAIL;
 560
 561         if (!(dev->flags & IFF_UP))
 562                 goto out;
 563
 564         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 565                 err = dev_uc_add(real_dev, addr->sa_data);
 566                 if (err < 0)
 567                         return err;
 568         }
 569
 570         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 571                 dev_uc_del(real_dev, dev->dev_addr);
 572
 573 out:
 574         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 575         return 0;
 576 }
 577
 578 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 579 {
 580         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 581         const struct net_device_ops *ops = real_dev->netdev_ops;
 582         struct ifreq ifrr;
 583         int err = -EOPNOTSUPP;
 584
 585         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 586         ifrr.ifr_ifru = ifr->ifr_ifru;
 587
 588         switch (cmd) {
 589         case SIOCGMIIPHY:
 590         case SIOCGMIIREG:
 591         case SIOCSMIIREG:
 592                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 593                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 594                 break;
 595         }
 596
 597         if (!err)
 598                 ifr->ifr_ifru = ifrr.ifr_ifru;
 599
 600         return err;
 601 }
 602
 603 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 604 {
 605         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 606         const struct net_device_ops *ops = real_dev->netdev_ops;
 607         int err = 0;
 608
 609         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 610                 err = ops->ndo_neigh_setup(real_dev, pa);
 611
 612         return err;
 613 }
 614
 615 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 616 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 617                                    struct scatterlist *sgl, unsigned int sgc)
 618 {
 619         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 620         const struct net_device_ops *ops = real_dev->netdev_ops;
 621         int rc = 0;
 622
 623         if (ops->ndo_fcoe_ddp_setup)
 624                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 625
 626         return rc;
 627 }
 628
 629 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 630 {
 631         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 632         const struct net_device_ops *ops = real_dev->netdev_ops;
 633         int len = 0;
 634
 635         if (ops->ndo_fcoe_ddp_done)
 636                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 637
 638         return len;
 639 }
 640
 641 static int vlan_dev_fcoe_enable(struct net_device *dev)
 642 {
 643         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 644         const struct net_device_ops *ops = real_dev->netdev_ops;
 645         int rc = -EINVAL;
 646
 647         if (ops->ndo_fcoe_enable)
 648                 rc = ops->ndo_fcoe_enable(real_dev);
 649         return rc;
 650 }
 651
 652 static int vlan_dev_fcoe_disable(struct net_device *dev)
 653 {
 654         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 655         const struct net_device_ops *ops = real_dev->netdev_ops;
 656         int rc = -EINVAL;
 657
 658         if (ops->ndo_fcoe_disable)
 659                 rc = ops->ndo_fcoe_disable(real_dev);
 660         return rc;
 661 }
 662
 663 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 664 {
 665         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 666         const struct net_device_ops *ops = real_dev->netdev_ops;
 667         int rc = -EINVAL;
 668
 669         if (ops->ndo_fcoe_get_wwn)
 670                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 671         return rc;
 672 }
 673 #endif
 674
 675 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 676 {
 677         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 678
 679         if (change & IFF_ALLMULTI)
 680                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 681         if (change & IFF_PROMISC)
 682                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 683 }
 684
 685 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 686 {
 687         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 688         dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 689 }
 690
 691 /*
 692  * vlan network devices have devices nesting below it, and are a special
 693  * "super class" of normal network devices; split their locks off into a
 694  * separate class since they always nest.
 695  */
 696 static struct lock_class_key vlan_netdev_xmit_lock_key;
 697 static struct lock_class_key vlan_netdev_addr_lock_key;
 698
 699 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 700                                      struct netdev_queue *txq,
 701                                      void *_subclass)
 702 {
 703         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 704                                        &vlan_netdev_xmit_lock_key,
 705                                        *(int *)_subclass);
 706 }
 707
 708 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 709 {
 710         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 711                                        &vlan_netdev_addr_lock_key,
 712                                        subclass);
 713         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 714 }
 715
 716 static const struct header_ops vlan_header_ops = {
 717         .create  = vlan_dev_hard_header,
 718         .rebuild = vlan_dev_rebuild_header,
 719         .parse   = eth_header_parse,
 720 };
 721
 722 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops,
 723                     vlan_netdev_ops_sq, vlan_netdev_accel_ops_sq;
 724
 725 static int vlan_dev_init(struct net_device *dev)
 726 {
 727         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 728         int subclass = 0;
 729
 730         netif_carrier_off(dev);
 731
 732         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 733         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 734                                           IFF_MASTER | IFF_SLAVE);
 735         dev->iflink = real_dev->ifindex;
 736         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 737                                           (1<<__LINK_STATE_DORMANT))) |
 738                       (1<<__LINK_STATE_PRESENT);
 739
 740         dev->features |= real_dev->features & real_dev->vlan_features;
 741         dev->gso_max_size = real_dev->gso_max_size;
 742
 743         /* ipv6 shared card related stuff */
 744         dev->dev_id = real_dev->dev_id;
 745
 746         if (is_zero_ether_addr(dev->dev_addr))
 747                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 748         if (is_zero_ether_addr(dev->broadcast))
 749                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 750
 751 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 752         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 753 #endif
 754
 755         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 756                 dev->header_ops      = real_dev->header_ops;
 757                 dev->hard_header_len = real_dev->hard_header_len;
 758                 if (real_dev->netdev_ops->ndo_select_queue)
 759                         dev->netdev_ops = &vlan_netdev_accel_ops_sq;
 760                 else
 761                         dev->netdev_ops = &vlan_netdev_accel_ops;
 762         } else {
 763                 dev->header_ops      = &vlan_header_ops;
 764                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 765                 if (real_dev->netdev_ops->ndo_select_queue)
 766                         dev->netdev_ops = &vlan_netdev_ops_sq;
 767                 else
 768                         dev->netdev_ops = &vlan_netdev_ops;
 769         }
 770
 771         if (is_vlan_dev(real_dev))
 772                 subclass = 1;
 773
 774         vlan_dev_set_lockdep_class(dev, subclass);
 775
 776         vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats);
 777         if (!vlan_dev_info(dev)->vlan_rx_stats)
 778                 return -ENOMEM;
 779
 780         return 0;
 781 }
 782
 783 static void vlan_dev_uninit(struct net_device *dev)
 784 {
 785         struct vlan_priority_tci_mapping *pm;
 786         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 787         int i;
 788
 789         free_percpu(vlan->vlan_rx_stats);
 790         vlan->vlan_rx_stats = NULL;
 791         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 792                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 793                         vlan->egress_priority_map[i] = pm->next;
 794                         kfree(pm);
 795                 }
 796         }
 797 }
 798
 799 static int vlan_ethtool_get_settings(struct net_device *dev,
 800                                      struct ethtool_cmd *cmd)
 801 {
 802         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 803         return dev_ethtool_get_settings(vlan->real_dev, cmd);
 804 }
 805
 806 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 807                                      struct ethtool_drvinfo *info)
 808 {
 809         strcpy(info->driver, vlan_fullname);
 810         strcpy(info->version, vlan_version);
 811         strcpy(info->fw_version, "N/A");
 812 }
 813
 814 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 815 {
 816         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 817         return dev_ethtool_get_rx_csum(vlan->real_dev);
 818 }
 819
 820 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 821 {
 822         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 823         return dev_ethtool_get_flags(vlan->real_dev);
 824 }
 825
 826 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 827 {
 828         dev_txq_stats_fold(dev, stats);
 829
 830         if (vlan_dev_info(dev)->vlan_rx_stats) {
 831                 struct vlan_rx_stats *p, accum = {0};
 832                 int i;
 833
 834                 for_each_possible_cpu(i) {
 835                         u64 rxpackets, rxbytes, rxmulticast;
 836                         unsigned int start;
 837
 838                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i);
 839                         do {
 840                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 841                                 rxpackets       = p->rx_packets;
 842                                 rxbytes         = p->rx_bytes;
 843                                 rxmulticast     = p->rx_multicast;
 844                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 845                         accum.rx_packets += rxpackets;
 846                         accum.rx_bytes   += rxbytes;
 847                         accum.rx_multicast += rxmulticast;
 848                         /* rx_errors is ulong, not protected by syncp */
 849                         accum.rx_errors  += p->rx_errors;
 850                 }
 851                 stats->rx_packets = accum.rx_packets;
 852                 stats->rx_bytes   = accum.rx_bytes;
 853                 stats->rx_errors  = accum.rx_errors;
 854                 stats->multicast  = accum.rx_multicast;
 855         }
 856         return stats;
 857 }
 858
 859 static int vlan_ethtool_set_tso(struct net_device *dev, u32 data)
 860 {
 861        if (data) {
 862                 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 863
 864                 /* Underlying device must support TSO for VLAN-tagged packets
 865                  * and must have TSO enabled now.
 866                  */
 867                 if (!(real_dev->vlan_features & NETIF_F_TSO))
 868                         return -EOPNOTSUPP;
 869                 if (!(real_dev->features & NETIF_F_TSO))
 870                         return -EINVAL;
 871                 dev->features |= NETIF_F_TSO;
 872         } else {
 873                 dev->features &= ~NETIF_F_TSO;
 874         }
 875         return 0;
 876 }
 877
 878 static const struct ethtool_ops vlan_ethtool_ops = {
 879         .get_settings           = vlan_ethtool_get_settings,
 880         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 881         .get_link               = ethtool_op_get_link,
 882         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 883         .get_flags              = vlan_ethtool_get_flags,
 884         .set_tso                = vlan_ethtool_set_tso,
 885 };
 886
 887 static const struct net_device_ops vlan_netdev_ops = {
 888         .ndo_change_mtu         = vlan_dev_change_mtu,
 889         .ndo_init               = vlan_dev_init,
 890         .ndo_uninit             = vlan_dev_uninit,
 891         .ndo_open               = vlan_dev_open,
 892         .ndo_stop               = vlan_dev_stop,
 893         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 894         .ndo_validate_addr      = eth_validate_addr,
 895         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 896         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 897         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 898         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 899         .ndo_do_ioctl           = vlan_dev_ioctl,
 900         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 901         .ndo_get_stats64        = vlan_dev_get_stats64,
 902 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 903         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 904         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 905         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 906         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 907         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 908 #endif
 909 };
 910
 911 static const struct net_device_ops vlan_netdev_accel_ops = {
 912         .ndo_change_mtu         = vlan_dev_change_mtu,
 913         .ndo_init               = vlan_dev_init,
 914         .ndo_uninit             = vlan_dev_uninit,
 915         .ndo_open               = vlan_dev_open,
 916         .ndo_stop               = vlan_dev_stop,
 917         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 918         .ndo_validate_addr      = eth_validate_addr,
 919         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 920         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 921         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 922         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 923         .ndo_do_ioctl           = vlan_dev_ioctl,
 924         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 925         .ndo_get_stats64        = vlan_dev_get_stats64,
 926 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 927         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 928         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 929         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 930         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 931         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 932 #endif
 933 };
 934
 935 static const struct net_device_ops vlan_netdev_ops_sq = {
 936         .ndo_select_queue       = vlan_dev_select_queue,
 937         .ndo_change_mtu         = vlan_dev_change_mtu,
 938         .ndo_init               = vlan_dev_init,
 939         .ndo_uninit             = vlan_dev_uninit,
 940         .ndo_open               = vlan_dev_open,
 941         .ndo_stop               = vlan_dev_stop,
 942         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 943         .ndo_validate_addr      = eth_validate_addr,
 944         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 945         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 946         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 947         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 948         .ndo_do_ioctl           = vlan_dev_ioctl,
 949         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 950         .ndo_get_stats64        = vlan_dev_get_stats64,
 951 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 952         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 953         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 954         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 955         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 956         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 957 #endif
 958 };
 959
 960 static const struct net_device_ops vlan_netdev_accel_ops_sq = {
 961         .ndo_select_queue       = vlan_dev_select_queue,
 962         .ndo_change_mtu         = vlan_dev_change_mtu,
 963         .ndo_init               = vlan_dev_init,
 964         .ndo_uninit             = vlan_dev_uninit,
 965         .ndo_open               = vlan_dev_open,
 966         .ndo_stop               = vlan_dev_stop,
 967         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 968         .ndo_validate_addr      = eth_validate_addr,
 969         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 970         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 971         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 972         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 973         .ndo_do_ioctl           = vlan_dev_ioctl,
 974         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 975         .ndo_get_stats64        = vlan_dev_get_stats64,
 976 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 977         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 978         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 979         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 980         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 981         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 982 #endif
 983 };
 984
 985 void vlan_setup(struct net_device *dev)
 986 {
 987         ether_setup(dev);
 988
 989         dev->priv_flags         |= IFF_802_1Q_VLAN;
 990         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 991         dev->tx_queue_len       = 0;
 992
 993         dev->netdev_ops         = &vlan_netdev_ops;
 994         dev->destructor         = free_netdev;
 995         dev->ethtool_ops        = &vlan_ethtool_ops;
 996
 997         memset(dev->broadcast, 0, ETH_ALEN);
 998 }