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 = __find_vlan_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 = per_cpu_ptr(vlan_dev_info(skb->dev)->vlan_rx_stats,
 181                                         smp_processor_id());
 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         rcu_read_unlock();
 230         return NET_RX_SUCCESS;
 231
 232 err_unlock:
 233         rcu_read_unlock();
 234 err_free:
 235         kfree_skb(skb);
 236         return NET_RX_DROP;
 237 }
 238
 239 static inline u16
 240 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 241 {
 242         struct vlan_priority_tci_mapping *mp;
 243
 244         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 245         while (mp) {
 246                 if (mp->priority == skb->priority) {
 247                         return mp->vlan_qos; /* This should already be shifted
 248                                               * to mask correctly with the
 249                                               * VLAN's TCI */
 250                 }
 251                 mp = mp->next;
 252         }
 253         return 0;
 254 }
 255
 256 /*
 257  *      Create the VLAN header for an arbitrary protocol layer
 258  *
 259  *      saddr=NULL      means use device source address
 260  *      daddr=NULL      means leave destination address (eg unresolved arp)
 261  *
 262  *  This is called when the SKB is moving down the stack towards the
 263  *  physical devices.
 264  */
 265 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 266                                 unsigned short type,
 267                                 const void *daddr, const void *saddr,
 268                                 unsigned int len)
 269 {
 270         struct vlan_hdr *vhdr;
 271         unsigned int vhdrlen = 0;
 272         u16 vlan_tci = 0;
 273         int rc;
 274
 275         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 276                 return -ENOSPC;
 277
 278         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 279                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 280
 281                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 282                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 283                 vhdr->h_vlan_TCI = htons(vlan_tci);
 284
 285                 /*
 286                  *  Set the protocol type. For a packet of type ETH_P_802_3/2 we
 287                  *  put the length in here instead.
 288                  */
 289                 if (type != ETH_P_802_3 && type != ETH_P_802_2)
 290                         vhdr->h_vlan_encapsulated_proto = htons(type);
 291                 else
 292                         vhdr->h_vlan_encapsulated_proto = htons(len);
 293
 294                 skb->protocol = htons(ETH_P_8021Q);
 295                 type = ETH_P_8021Q;
 296                 vhdrlen = VLAN_HLEN;
 297         }
 298
 299         /* Before delegating work to the lower layer, enter our MAC-address */
 300         if (saddr == NULL)
 301                 saddr = dev->dev_addr;
 302
 303         /* Now make the underlying real hard header */
 304         dev = vlan_dev_info(dev)->real_dev;
 305         rc = dev_hard_header(skb, dev, type, daddr, saddr, len + vhdrlen);
 306         if (rc > 0)
 307                 rc += vhdrlen;
 308         return rc;
 309 }
 310
 311 static netdev_tx_t vlan_dev_hard_start_xmit(struct sk_buff *skb,
 312                                             struct net_device *dev)
 313 {
 314         int i = skb_get_queue_mapping(skb);
 315         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 316         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 317         unsigned int len;
 318         int ret;
 319
 320         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 321          *
 322          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 323          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 324          */
 325         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 326             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 327                 unsigned int orig_headroom = skb_headroom(skb);
 328                 u16 vlan_tci;
 329
 330                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 331
 332                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 333                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 334                 skb = __vlan_put_tag(skb, vlan_tci);
 335                 if (!skb) {
 336                         txq->tx_dropped++;
 337                         return NETDEV_TX_OK;
 338                 }
 339
 340                 if (orig_headroom < VLAN_HLEN)
 341                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 342         }
 343
 344
 345         skb_set_dev(skb, vlan_dev_info(dev)->real_dev);
 346         len = skb->len;
 347         ret = dev_queue_xmit(skb);
 348
 349         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 350                 txq->tx_packets++;
 351                 txq->tx_bytes += len;
 352         } else
 353                 txq->tx_dropped++;
 354
 355         return ret;
 356 }
 357
 358 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 359                                                     struct net_device *dev)
 360 {
 361         int i = skb_get_queue_mapping(skb);
 362         struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
 363         u16 vlan_tci;
 364         unsigned int len;
 365         int ret;
 366
 367         vlan_tci = vlan_dev_info(dev)->vlan_id;
 368         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 369         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 370
 371         skb->dev = vlan_dev_info(dev)->real_dev;
 372         len = skb->len;
 373         ret = dev_queue_xmit(skb);
 374
 375         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 376                 txq->tx_packets++;
 377                 txq->tx_bytes += len;
 378         } else
 379                 txq->tx_dropped++;
 380
 381         return ret;
 382 }
 383
 384 static u16 vlan_dev_select_queue(struct net_device *dev, struct sk_buff *skb)
 385 {
 386         struct net_device *rdev = vlan_dev_info(dev)->real_dev;
 387         const struct net_device_ops *ops = rdev->netdev_ops;
 388
 389         return ops->ndo_select_queue(rdev, skb);
 390 }
 391
 392 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 393 {
 394         /* TODO: gotta make sure the underlying layer can handle it,
 395          * maybe an IFF_VLAN_CAPABLE flag for devices?
 396          */
 397         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 398                 return -ERANGE;
 399
 400         dev->mtu = new_mtu;
 401
 402         return 0;
 403 }
 404
 405 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 406                                    u32 skb_prio, u16 vlan_prio)
 407 {
 408         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 409
 410         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 411                 vlan->nr_ingress_mappings--;
 412         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 413                 vlan->nr_ingress_mappings++;
 414
 415         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 416 }
 417
 418 int vlan_dev_set_egress_priority(const struct net_device *dev,
 419                                  u32 skb_prio, u16 vlan_prio)
 420 {
 421         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 422         struct vlan_priority_tci_mapping *mp = NULL;
 423         struct vlan_priority_tci_mapping *np;
 424         u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
 425
 426         /* See if a priority mapping exists.. */
 427         mp = vlan->egress_priority_map[skb_prio & 0xF];
 428         while (mp) {
 429                 if (mp->priority == skb_prio) {
 430                         if (mp->vlan_qos && !vlan_qos)
 431                                 vlan->nr_egress_mappings--;
 432                         else if (!mp->vlan_qos && vlan_qos)
 433                                 vlan->nr_egress_mappings++;
 434                         mp->vlan_qos = vlan_qos;
 435                         return 0;
 436                 }
 437                 mp = mp->next;
 438         }
 439
 440         /* Create a new mapping then. */
 441         mp = vlan->egress_priority_map[skb_prio & 0xF];
 442         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 443         if (!np)
 444                 return -ENOBUFS;
 445
 446         np->next = mp;
 447         np->priority = skb_prio;
 448         np->vlan_qos = vlan_qos;
 449         vlan->egress_priority_map[skb_prio & 0xF] = np;
 450         if (vlan_qos)
 451                 vlan->nr_egress_mappings++;
 452         return 0;
 453 }
 454
 455 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 456 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 457 {
 458         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 459         u32 old_flags = vlan->flags;
 460
 461         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 462                      VLAN_FLAG_LOOSE_BINDING))
 463                 return -EINVAL;
 464
 465         vlan->flags = (old_flags & ~mask) | (flags & mask);
 466
 467         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 468                 if (vlan->flags & VLAN_FLAG_GVRP)
 469                         vlan_gvrp_request_join(dev);
 470                 else
 471                         vlan_gvrp_request_leave(dev);
 472         }
 473         return 0;
 474 }
 475
 476 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 477 {
 478         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 479 }
 480
 481 static int vlan_dev_open(struct net_device *dev)
 482 {
 483         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 484         struct net_device *real_dev = vlan->real_dev;
 485         int err;
 486
 487         if (!(real_dev->flags & IFF_UP) &&
 488             !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 489                 return -ENETDOWN;
 490
 491         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 492                 err = dev_uc_add(real_dev, dev->dev_addr);
 493                 if (err < 0)
 494                         goto out;
 495         }
 496
 497         if (dev->flags & IFF_ALLMULTI) {
 498                 err = dev_set_allmulti(real_dev, 1);
 499                 if (err < 0)
 500                         goto del_unicast;
 501         }
 502         if (dev->flags & IFF_PROMISC) {
 503                 err = dev_set_promiscuity(real_dev, 1);
 504                 if (err < 0)
 505                         goto clear_allmulti;
 506         }
 507
 508         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 509
 510         if (vlan->flags & VLAN_FLAG_GVRP)
 511                 vlan_gvrp_request_join(dev);
 512
 513         netif_carrier_on(dev);
 514         return 0;
 515
 516 clear_allmulti:
 517         if (dev->flags & IFF_ALLMULTI)
 518                 dev_set_allmulti(real_dev, -1);
 519 del_unicast:
 520         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 521                 dev_uc_del(real_dev, dev->dev_addr);
 522 out:
 523         netif_carrier_off(dev);
 524         return err;
 525 }
 526
 527 static int vlan_dev_stop(struct net_device *dev)
 528 {
 529         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 530         struct net_device *real_dev = vlan->real_dev;
 531
 532         if (vlan->flags & VLAN_FLAG_GVRP)
 533                 vlan_gvrp_request_leave(dev);
 534
 535         dev_mc_unsync(real_dev, dev);
 536         dev_uc_unsync(real_dev, dev);
 537         if (dev->flags & IFF_ALLMULTI)
 538                 dev_set_allmulti(real_dev, -1);
 539         if (dev->flags & IFF_PROMISC)
 540                 dev_set_promiscuity(real_dev, -1);
 541
 542         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 543                 dev_uc_del(real_dev, dev->dev_addr);
 544
 545         netif_carrier_off(dev);
 546         return 0;
 547 }
 548
 549 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 550 {
 551         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 552         struct sockaddr *addr = p;
 553         int err;
 554
 555         if (!is_valid_ether_addr(addr->sa_data))
 556                 return -EADDRNOTAVAIL;
 557
 558         if (!(dev->flags & IFF_UP))
 559                 goto out;
 560
 561         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 562                 err = dev_uc_add(real_dev, addr->sa_data);
 563                 if (err < 0)
 564                         return err;
 565         }
 566
 567         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 568                 dev_uc_del(real_dev, dev->dev_addr);
 569
 570 out:
 571         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 572         return 0;
 573 }
 574
 575 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 576 {
 577         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 578         const struct net_device_ops *ops = real_dev->netdev_ops;
 579         struct ifreq ifrr;
 580         int err = -EOPNOTSUPP;
 581
 582         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 583         ifrr.ifr_ifru = ifr->ifr_ifru;
 584
 585         switch (cmd) {
 586         case SIOCGMIIPHY:
 587         case SIOCGMIIREG:
 588         case SIOCSMIIREG:
 589                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 590                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 591                 break;
 592         }
 593
 594         if (!err)
 595                 ifr->ifr_ifru = ifrr.ifr_ifru;
 596
 597         return err;
 598 }
 599
 600 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 601 {
 602         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 603         const struct net_device_ops *ops = real_dev->netdev_ops;
 604         int err = 0;
 605
 606         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 607                 err = ops->ndo_neigh_setup(real_dev, pa);
 608
 609         return err;
 610 }
 611
 612 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 613 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 614                                    struct scatterlist *sgl, unsigned int sgc)
 615 {
 616         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 617         const struct net_device_ops *ops = real_dev->netdev_ops;
 618         int rc = 0;
 619
 620         if (ops->ndo_fcoe_ddp_setup)
 621                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 622
 623         return rc;
 624 }
 625
 626 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 627 {
 628         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 629         const struct net_device_ops *ops = real_dev->netdev_ops;
 630         int len = 0;
 631
 632         if (ops->ndo_fcoe_ddp_done)
 633                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 634
 635         return len;
 636 }
 637
 638 static int vlan_dev_fcoe_enable(struct net_device *dev)
 639 {
 640         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 641         const struct net_device_ops *ops = real_dev->netdev_ops;
 642         int rc = -EINVAL;
 643
 644         if (ops->ndo_fcoe_enable)
 645                 rc = ops->ndo_fcoe_enable(real_dev);
 646         return rc;
 647 }
 648
 649 static int vlan_dev_fcoe_disable(struct net_device *dev)
 650 {
 651         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 652         const struct net_device_ops *ops = real_dev->netdev_ops;
 653         int rc = -EINVAL;
 654
 655         if (ops->ndo_fcoe_disable)
 656                 rc = ops->ndo_fcoe_disable(real_dev);
 657         return rc;
 658 }
 659
 660 static int vlan_dev_fcoe_get_wwn(struct net_device *dev, u64 *wwn, int type)
 661 {
 662         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 663         const struct net_device_ops *ops = real_dev->netdev_ops;
 664         int rc = -EINVAL;
 665
 666         if (ops->ndo_fcoe_get_wwn)
 667                 rc = ops->ndo_fcoe_get_wwn(real_dev, wwn, type);
 668         return rc;
 669 }
 670 #endif
 671
 672 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 673 {
 674         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 675
 676         if (change & IFF_ALLMULTI)
 677                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 678         if (change & IFF_PROMISC)
 679                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 680 }
 681
 682 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 683 {
 684         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 685         dev_uc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 686 }
 687
 688 /*
 689  * vlan network devices have devices nesting below it, and are a special
 690  * "super class" of normal network devices; split their locks off into a
 691  * separate class since they always nest.
 692  */
 693 static struct lock_class_key vlan_netdev_xmit_lock_key;
 694 static struct lock_class_key vlan_netdev_addr_lock_key;
 695
 696 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 697                                      struct netdev_queue *txq,
 698                                      void *_subclass)
 699 {
 700         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 701                                        &vlan_netdev_xmit_lock_key,
 702                                        *(int *)_subclass);
 703 }
 704
 705 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 706 {
 707         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 708                                        &vlan_netdev_addr_lock_key,
 709                                        subclass);
 710         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 711 }
 712
 713 static const struct header_ops vlan_header_ops = {
 714         .create  = vlan_dev_hard_header,
 715         .rebuild = vlan_dev_rebuild_header,
 716         .parse   = eth_header_parse,
 717 };
 718
 719 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops,
 720                     vlan_netdev_ops_sq, vlan_netdev_accel_ops_sq;
 721
 722 static int vlan_dev_init(struct net_device *dev)
 723 {
 724         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 725         int subclass = 0;
 726
 727         netif_carrier_off(dev);
 728
 729         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 730         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
 731                                           IFF_MASTER | IFF_SLAVE);
 732         dev->iflink = real_dev->ifindex;
 733         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 734                                           (1<<__LINK_STATE_DORMANT))) |
 735                       (1<<__LINK_STATE_PRESENT);
 736
 737         dev->features |= real_dev->features & real_dev->vlan_features;
 738         dev->gso_max_size = real_dev->gso_max_size;
 739
 740         /* ipv6 shared card related stuff */
 741         dev->dev_id = real_dev->dev_id;
 742
 743         if (is_zero_ether_addr(dev->dev_addr))
 744                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 745         if (is_zero_ether_addr(dev->broadcast))
 746                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 747
 748 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 749         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 750 #endif
 751
 752         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 753                 dev->header_ops      = real_dev->header_ops;
 754                 dev->hard_header_len = real_dev->hard_header_len;
 755                 if (real_dev->netdev_ops->ndo_select_queue)
 756                         dev->netdev_ops = &vlan_netdev_accel_ops_sq;
 757                 else
 758                         dev->netdev_ops = &vlan_netdev_accel_ops;
 759         } else {
 760                 dev->header_ops      = &vlan_header_ops;
 761                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 762                 if (real_dev->netdev_ops->ndo_select_queue)
 763                         dev->netdev_ops = &vlan_netdev_ops_sq;
 764                 else
 765                         dev->netdev_ops = &vlan_netdev_ops;
 766         }
 767
 768         if (is_vlan_dev(real_dev))
 769                 subclass = 1;
 770
 771         vlan_dev_set_lockdep_class(dev, subclass);
 772
 773         vlan_dev_info(dev)->vlan_rx_stats = alloc_percpu(struct vlan_rx_stats);
 774         if (!vlan_dev_info(dev)->vlan_rx_stats)
 775                 return -ENOMEM;
 776
 777         return 0;
 778 }
 779
 780 static void vlan_dev_uninit(struct net_device *dev)
 781 {
 782         struct vlan_priority_tci_mapping *pm;
 783         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 784         int i;
 785
 786         free_percpu(vlan->vlan_rx_stats);
 787         vlan->vlan_rx_stats = NULL;
 788         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 789                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 790                         vlan->egress_priority_map[i] = pm->next;
 791                         kfree(pm);
 792                 }
 793         }
 794 }
 795
 796 static int vlan_ethtool_get_settings(struct net_device *dev,
 797                                      struct ethtool_cmd *cmd)
 798 {
 799         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 800         return dev_ethtool_get_settings(vlan->real_dev, cmd);
 801 }
 802
 803 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 804                                      struct ethtool_drvinfo *info)
 805 {
 806         strcpy(info->driver, vlan_fullname);
 807         strcpy(info->version, vlan_version);
 808         strcpy(info->fw_version, "N/A");
 809 }
 810
 811 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 812 {
 813         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 814         return dev_ethtool_get_rx_csum(vlan->real_dev);
 815 }
 816
 817 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 818 {
 819         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 820         return dev_ethtool_get_flags(vlan->real_dev);
 821 }
 822
 823 static struct rtnl_link_stats64 *vlan_dev_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 824 {
 825         dev_txq_stats_fold(dev, stats);
 826
 827         if (vlan_dev_info(dev)->vlan_rx_stats) {
 828                 struct vlan_rx_stats *p, accum = {0};
 829                 int i;
 830
 831                 for_each_possible_cpu(i) {
 832                         u64 rxpackets, rxbytes, rxmulticast;
 833                         unsigned int start;
 834
 835                         p = per_cpu_ptr(vlan_dev_info(dev)->vlan_rx_stats, i);
 836                         do {
 837                                 start = u64_stats_fetch_begin_bh(&p->syncp);
 838                                 rxpackets       = p->rx_packets;
 839                                 rxbytes         = p->rx_bytes;
 840                                 rxmulticast     = p->rx_multicast;
 841                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 842                         accum.rx_packets += rxpackets;
 843                         accum.rx_bytes   += rxbytes;
 844                         accum.rx_multicast += rxmulticast;
 845                         /* rx_errors is an ulong, not protected by syncp */
 846                         accum.rx_errors  += p->rx_errors;
 847                 }
 848                 stats->rx_packets = accum.rx_packets;
 849                 stats->rx_bytes   = accum.rx_bytes;
 850                 stats->rx_errors  = accum.rx_errors;
 851                 stats->multicast  = accum.rx_multicast;
 852         }
 853         return stats;
 854 }
 855
 856 static int vlan_ethtool_set_tso(struct net_device *dev, u32 data)
 857 {
 858        if (data) {
 859                 struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 860
 861                 /* Underlying device must support TSO for VLAN-tagged packets
 862                  * and must have TSO enabled now.
 863                  */
 864                 if (!(real_dev->vlan_features & NETIF_F_TSO))
 865                         return -EOPNOTSUPP;
 866                 if (!(real_dev->features & NETIF_F_TSO))
 867                         return -EINVAL;
 868                 dev->features |= NETIF_F_TSO;
 869         } else {
 870                 dev->features &= ~NETIF_F_TSO;
 871         }
 872         return 0;
 873 }
 874
 875 static const struct ethtool_ops vlan_ethtool_ops = {
 876         .get_settings           = vlan_ethtool_get_settings,
 877         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 878         .get_link               = ethtool_op_get_link,
 879         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 880         .get_flags              = vlan_ethtool_get_flags,
 881         .set_tso                = vlan_ethtool_set_tso,
 882 };
 883
 884 static const struct net_device_ops vlan_netdev_ops = {
 885         .ndo_change_mtu         = vlan_dev_change_mtu,
 886         .ndo_init               = vlan_dev_init,
 887         .ndo_uninit             = vlan_dev_uninit,
 888         .ndo_open               = vlan_dev_open,
 889         .ndo_stop               = vlan_dev_stop,
 890         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 891         .ndo_validate_addr      = eth_validate_addr,
 892         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 893         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 894         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 895         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 896         .ndo_do_ioctl           = vlan_dev_ioctl,
 897         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 898         .ndo_get_stats64        = vlan_dev_get_stats64,
 899 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 900         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 901         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 902         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 903         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 904         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 905 #endif
 906 };
 907
 908 static const struct net_device_ops vlan_netdev_accel_ops = {
 909         .ndo_change_mtu         = vlan_dev_change_mtu,
 910         .ndo_init               = vlan_dev_init,
 911         .ndo_uninit             = vlan_dev_uninit,
 912         .ndo_open               = vlan_dev_open,
 913         .ndo_stop               = vlan_dev_stop,
 914         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 915         .ndo_validate_addr      = eth_validate_addr,
 916         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 917         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 918         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 919         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 920         .ndo_do_ioctl           = vlan_dev_ioctl,
 921         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 922         .ndo_get_stats64        = vlan_dev_get_stats64,
 923 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 924         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 925         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 926         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 927         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 928         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 929 #endif
 930 };
 931
 932 static const struct net_device_ops vlan_netdev_ops_sq = {
 933         .ndo_select_queue       = vlan_dev_select_queue,
 934         .ndo_change_mtu         = vlan_dev_change_mtu,
 935         .ndo_init               = vlan_dev_init,
 936         .ndo_uninit             = vlan_dev_uninit,
 937         .ndo_open               = vlan_dev_open,
 938         .ndo_stop               = vlan_dev_stop,
 939         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 940         .ndo_validate_addr      = eth_validate_addr,
 941         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 942         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 943         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 944         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 945         .ndo_do_ioctl           = vlan_dev_ioctl,
 946         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 947         .ndo_get_stats64        = vlan_dev_get_stats64,
 948 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 949         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 950         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 951         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 952         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 953         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 954 #endif
 955 };
 956
 957 static const struct net_device_ops vlan_netdev_accel_ops_sq = {
 958         .ndo_select_queue       = vlan_dev_select_queue,
 959         .ndo_change_mtu         = vlan_dev_change_mtu,
 960         .ndo_init               = vlan_dev_init,
 961         .ndo_uninit             = vlan_dev_uninit,
 962         .ndo_open               = vlan_dev_open,
 963         .ndo_stop               = vlan_dev_stop,
 964         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 965         .ndo_validate_addr      = eth_validate_addr,
 966         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 967         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 968         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 969         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 970         .ndo_do_ioctl           = vlan_dev_ioctl,
 971         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 972         .ndo_get_stats64        = vlan_dev_get_stats64,
 973 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 974         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 975         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 976         .ndo_fcoe_enable        = vlan_dev_fcoe_enable,
 977         .ndo_fcoe_disable       = vlan_dev_fcoe_disable,
 978         .ndo_fcoe_get_wwn       = vlan_dev_fcoe_get_wwn,
 979 #endif
 980 };
 981
 982 void vlan_setup(struct net_device *dev)
 983 {
 984         ether_setup(dev);
 985
 986         dev->priv_flags         |= IFF_802_1Q_VLAN;
 987         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 988         dev->tx_queue_len       = 0;
 989
 990         dev->netdev_ops         = &vlan_netdev_ops;
 991         dev->destructor         = free_netdev;
 992         dev->ethtool_ops        = &vlan_ethtool_ops;
 993
 994         memset(dev->broadcast, 0, ETH_ALEN);
 995 }