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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 net_device_stats *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         stats = &skb->dev->stats;
 167         stats->rx_packets++;
 168         stats->rx_bytes += skb->len;
 169
 170         skb_pull_rcsum(skb, VLAN_HLEN);
 171
 172         skb->priority = vlan_get_ingress_priority(skb->dev, vlan_tci);
 173
 174         pr_debug("%s: priority: %u for TCI: %hu\n",
 175                  __func__, skb->priority, vlan_tci);
 176
 177         switch (skb->pkt_type) {
 178         case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
 179                 /* stats->broadcast ++; // no such counter :-( */
 180                 break;
 181
 182         case PACKET_MULTICAST:
 183                 stats->multicast++;
 184                 break;
 185
 186         case PACKET_OTHERHOST:
 187                 /* Our lower layer thinks this is not local, let's make sure.
 188                  * This allows the VLAN to have a different MAC than the
 189                  * underlying device, and still route correctly.
 190                  */
 191                 if (!compare_ether_addr(eth_hdr(skb)->h_dest,
 192                                         skb->dev->dev_addr))
 193                         skb->pkt_type = PACKET_HOST;
 194                 break;
 195         default:
 196                 break;
 197         }
 198
 199         vlan_set_encap_proto(skb, vhdr);
 200
 201         skb = vlan_check_reorder_header(skb);
 202         if (!skb) {
 203                 stats->rx_errors++;
 204                 goto err_unlock;
 205         }
 206
 207         netif_rx(skb);
 208         rcu_read_unlock();
 209         return NET_RX_SUCCESS;
 210
 211 err_unlock:
 212         rcu_read_unlock();
 213 err_free:
 214         kfree_skb(skb);
 215         return NET_RX_DROP;
 216 }
 217
 218 static inline u16
 219 vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 220 {
 221         struct vlan_priority_tci_mapping *mp;
 222
 223         mp = vlan_dev_info(dev)->egress_priority_map[(skb->priority & 0xF)];
 224         while (mp) {
 225                 if (mp->priority == skb->priority) {
 226                         return mp->vlan_qos; /* This should already be shifted
 227                                               * to mask correctly with the
 228                                               * VLAN's TCI */
 229                 }
 230                 mp = mp->next;
 231         }
 232         return 0;
 233 }
 234
 235 /*
 236  *      Create the VLAN header for an arbitrary protocol layer
 237  *
 238  *      saddr=NULL      means use device source address
 239  *      daddr=NULL      means leave destination address (eg unresolved arp)
 240  *
 241  *  This is called when the SKB is moving down the stack towards the
 242  *  physical devices.
 243  */
 244 static int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 245                                 unsigned short type,
 246                                 const void *daddr, const void *saddr,
 247                                 unsigned int len)
 248 {
 249         struct vlan_hdr *vhdr;
 250         unsigned int vhdrlen = 0;
 251         u16 vlan_tci = 0;
 252         int rc;
 253
 254         if (WARN_ON(skb_headroom(skb) < dev->hard_header_len))
 255                 return -ENOSPC;
 256
 257         if (!(vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR)) {
 258                 vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
 259
 260                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 261                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 262                 vhdr->h_vlan_TCI = htons(vlan_tci);
 263
 264                 /*
 265                  *  Set the protocol type. For a packet of type ETH_P_802_3 we
 266                  *  put the length in here instead. It is up to the 802.2
 267                  *  layer to carry protocol information.
 268                  */
 269                 if (type != ETH_P_802_3)
 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         struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
 295         struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
 296
 297         /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
 298          *
 299          * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
 300          * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
 301          */
 302         if (veth->h_vlan_proto != htons(ETH_P_8021Q) ||
 303             vlan_dev_info(dev)->flags & VLAN_FLAG_REORDER_HDR) {
 304                 unsigned int orig_headroom = skb_headroom(skb);
 305                 u16 vlan_tci;
 306
 307                 vlan_dev_info(dev)->cnt_encap_on_xmit++;
 308
 309                 vlan_tci = vlan_dev_info(dev)->vlan_id;
 310                 vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 311                 skb = __vlan_put_tag(skb, vlan_tci);
 312                 if (!skb) {
 313                         txq->tx_dropped++;
 314                         return NETDEV_TX_OK;
 315                 }
 316
 317                 if (orig_headroom < VLAN_HLEN)
 318                         vlan_dev_info(dev)->cnt_inc_headroom_on_tx++;
 319         }
 320
 321         txq->tx_packets++;
 322         txq->tx_bytes += skb->len;
 323
 324         skb->dev = vlan_dev_info(dev)->real_dev;
 325         dev_queue_xmit(skb);
 326         return NETDEV_TX_OK;
 327 }
 328
 329 static netdev_tx_t vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb,
 330                                                     struct net_device *dev)
 331 {
 332         struct netdev_queue *txq = netdev_get_tx_queue(dev, 0);
 333         u16 vlan_tci;
 334
 335         vlan_tci = vlan_dev_info(dev)->vlan_id;
 336         vlan_tci |= vlan_dev_get_egress_qos_mask(dev, skb);
 337         skb = __vlan_hwaccel_put_tag(skb, vlan_tci);
 338
 339         txq->tx_packets++;
 340         txq->tx_bytes += skb->len;
 341
 342         skb->dev = vlan_dev_info(dev)->real_dev;
 343         dev_queue_xmit(skb);
 344         return NETDEV_TX_OK;
 345 }
 346
 347 static int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
 348 {
 349         /* TODO: gotta make sure the underlying layer can handle it,
 350          * maybe an IFF_VLAN_CAPABLE flag for devices?
 351          */
 352         if (vlan_dev_info(dev)->real_dev->mtu < new_mtu)
 353                 return -ERANGE;
 354
 355         dev->mtu = new_mtu;
 356
 357         return 0;
 358 }
 359
 360 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 361                                    u32 skb_prio, u16 vlan_prio)
 362 {
 363         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 364
 365         if (vlan->ingress_priority_map[vlan_prio & 0x7] && !skb_prio)
 366                 vlan->nr_ingress_mappings--;
 367         else if (!vlan->ingress_priority_map[vlan_prio & 0x7] && skb_prio)
 368                 vlan->nr_ingress_mappings++;
 369
 370         vlan->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
 371 }
 372
 373 int vlan_dev_set_egress_priority(const struct net_device *dev,
 374                                  u32 skb_prio, u16 vlan_prio)
 375 {
 376         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 377         struct vlan_priority_tci_mapping *mp = NULL;
 378         struct vlan_priority_tci_mapping *np;
 379         u32 vlan_qos = (vlan_prio << 13) & 0xE000;
 380
 381         /* See if a priority mapping exists.. */
 382         mp = vlan->egress_priority_map[skb_prio & 0xF];
 383         while (mp) {
 384                 if (mp->priority == skb_prio) {
 385                         if (mp->vlan_qos && !vlan_qos)
 386                                 vlan->nr_egress_mappings--;
 387                         else if (!mp->vlan_qos && vlan_qos)
 388                                 vlan->nr_egress_mappings++;
 389                         mp->vlan_qos = vlan_qos;
 390                         return 0;
 391                 }
 392                 mp = mp->next;
 393         }
 394
 395         /* Create a new mapping then. */
 396         mp = vlan->egress_priority_map[skb_prio & 0xF];
 397         np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
 398         if (!np)
 399                 return -ENOBUFS;
 400
 401         np->next = mp;
 402         np->priority = skb_prio;
 403         np->vlan_qos = vlan_qos;
 404         vlan->egress_priority_map[skb_prio & 0xF] = np;
 405         if (vlan_qos)
 406                 vlan->nr_egress_mappings++;
 407         return 0;
 408 }
 409
 410 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
 411 int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 412 {
 413         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 414         u32 old_flags = vlan->flags;
 415
 416         if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
 417                 return -EINVAL;
 418
 419         vlan->flags = (old_flags & ~mask) | (flags & mask);
 420
 421         if (netif_running(dev) && (vlan->flags ^ old_flags) & VLAN_FLAG_GVRP) {
 422                 if (vlan->flags & VLAN_FLAG_GVRP)
 423                         vlan_gvrp_request_join(dev);
 424                 else
 425                         vlan_gvrp_request_leave(dev);
 426         }
 427         return 0;
 428 }
 429
 430 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
 431 {
 432         strncpy(result, vlan_dev_info(dev)->real_dev->name, 23);
 433 }
 434
 435 static int vlan_dev_open(struct net_device *dev)
 436 {
 437         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 438         struct net_device *real_dev = vlan->real_dev;
 439         int err;
 440
 441         if (!(real_dev->flags & IFF_UP))
 442                 return -ENETDOWN;
 443
 444         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) {
 445                 err = dev_unicast_add(real_dev, dev->dev_addr);
 446                 if (err < 0)
 447                         goto out;
 448         }
 449
 450         if (dev->flags & IFF_ALLMULTI) {
 451                 err = dev_set_allmulti(real_dev, 1);
 452                 if (err < 0)
 453                         goto del_unicast;
 454         }
 455         if (dev->flags & IFF_PROMISC) {
 456                 err = dev_set_promiscuity(real_dev, 1);
 457                 if (err < 0)
 458                         goto clear_allmulti;
 459         }
 460
 461         memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN);
 462
 463         if (vlan->flags & VLAN_FLAG_GVRP)
 464                 vlan_gvrp_request_join(dev);
 465
 466         netif_carrier_on(dev);
 467         return 0;
 468
 469 clear_allmulti:
 470         if (dev->flags & IFF_ALLMULTI)
 471                 dev_set_allmulti(real_dev, -1);
 472 del_unicast:
 473         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 474                 dev_unicast_delete(real_dev, dev->dev_addr);
 475 out:
 476         netif_carrier_off(dev);
 477         return err;
 478 }
 479
 480 static int vlan_dev_stop(struct net_device *dev)
 481 {
 482         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 483         struct net_device *real_dev = vlan->real_dev;
 484
 485         if (vlan->flags & VLAN_FLAG_GVRP)
 486                 vlan_gvrp_request_leave(dev);
 487
 488         dev_mc_unsync(real_dev, dev);
 489         dev_unicast_unsync(real_dev, dev);
 490         if (dev->flags & IFF_ALLMULTI)
 491                 dev_set_allmulti(real_dev, -1);
 492         if (dev->flags & IFF_PROMISC)
 493                 dev_set_promiscuity(real_dev, -1);
 494
 495         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 496                 dev_unicast_delete(real_dev, dev->dev_addr);
 497
 498         netif_carrier_off(dev);
 499         return 0;
 500 }
 501
 502 static int vlan_dev_set_mac_address(struct net_device *dev, void *p)
 503 {
 504         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 505         struct sockaddr *addr = p;
 506         int err;
 507
 508         if (!is_valid_ether_addr(addr->sa_data))
 509                 return -EADDRNOTAVAIL;
 510
 511         if (!(dev->flags & IFF_UP))
 512                 goto out;
 513
 514         if (compare_ether_addr(addr->sa_data, real_dev->dev_addr)) {
 515                 err = dev_unicast_add(real_dev, addr->sa_data);
 516                 if (err < 0)
 517                         return err;
 518         }
 519
 520         if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr))
 521                 dev_unicast_delete(real_dev, dev->dev_addr);
 522
 523 out:
 524         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 525         return 0;
 526 }
 527
 528 static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 529 {
 530         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 531         const struct net_device_ops *ops = real_dev->netdev_ops;
 532         struct ifreq ifrr;
 533         int err = -EOPNOTSUPP;
 534
 535         strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
 536         ifrr.ifr_ifru = ifr->ifr_ifru;
 537
 538         switch (cmd) {
 539         case SIOCGMIIPHY:
 540         case SIOCGMIIREG:
 541         case SIOCSMIIREG:
 542                 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
 543                         err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
 544                 break;
 545         }
 546
 547         if (!err)
 548                 ifr->ifr_ifru = ifrr.ifr_ifru;
 549
 550         return err;
 551 }
 552
 553 static int vlan_dev_neigh_setup(struct net_device *dev, struct neigh_parms *pa)
 554 {
 555         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 556         const struct net_device_ops *ops = real_dev->netdev_ops;
 557         int err = 0;
 558
 559         if (netif_device_present(real_dev) && ops->ndo_neigh_setup)
 560                 err = ops->ndo_neigh_setup(real_dev, pa);
 561
 562         return err;
 563 }
 564
 565 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 566 static int vlan_dev_fcoe_ddp_setup(struct net_device *dev, u16 xid,
 567                                    struct scatterlist *sgl, unsigned int sgc)
 568 {
 569         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 570         const struct net_device_ops *ops = real_dev->netdev_ops;
 571         int rc = 0;
 572
 573         if (ops->ndo_fcoe_ddp_setup)
 574                 rc = ops->ndo_fcoe_ddp_setup(real_dev, xid, sgl, sgc);
 575
 576         return rc;
 577 }
 578
 579 static int vlan_dev_fcoe_ddp_done(struct net_device *dev, u16 xid)
 580 {
 581         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 582         const struct net_device_ops *ops = real_dev->netdev_ops;
 583         int len = 0;
 584
 585         if (ops->ndo_fcoe_ddp_done)
 586                 len = ops->ndo_fcoe_ddp_done(real_dev, xid);
 587
 588         return len;
 589 }
 590 #endif
 591
 592 static void vlan_dev_change_rx_flags(struct net_device *dev, int change)
 593 {
 594         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 595
 596         if (change & IFF_ALLMULTI)
 597                 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
 598         if (change & IFF_PROMISC)
 599                 dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);
 600 }
 601
 602 static void vlan_dev_set_rx_mode(struct net_device *vlan_dev)
 603 {
 604         dev_mc_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 605         dev_unicast_sync(vlan_dev_info(vlan_dev)->real_dev, vlan_dev);
 606 }
 607
 608 /*
 609  * vlan network devices have devices nesting below it, and are a special
 610  * "super class" of normal network devices; split their locks off into a
 611  * separate class since they always nest.
 612  */
 613 static struct lock_class_key vlan_netdev_xmit_lock_key;
 614 static struct lock_class_key vlan_netdev_addr_lock_key;
 615
 616 static void vlan_dev_set_lockdep_one(struct net_device *dev,
 617                                      struct netdev_queue *txq,
 618                                      void *_subclass)
 619 {
 620         lockdep_set_class_and_subclass(&txq->_xmit_lock,
 621                                        &vlan_netdev_xmit_lock_key,
 622                                        *(int *)_subclass);
 623 }
 624
 625 static void vlan_dev_set_lockdep_class(struct net_device *dev, int subclass)
 626 {
 627         lockdep_set_class_and_subclass(&dev->addr_list_lock,
 628                                        &vlan_netdev_addr_lock_key,
 629                                        subclass);
 630         netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, &subclass);
 631 }
 632
 633 static const struct header_ops vlan_header_ops = {
 634         .create  = vlan_dev_hard_header,
 635         .rebuild = vlan_dev_rebuild_header,
 636         .parse   = eth_header_parse,
 637 };
 638
 639 static const struct net_device_ops vlan_netdev_ops, vlan_netdev_accel_ops;
 640
 641 static int vlan_dev_init(struct net_device *dev)
 642 {
 643         struct net_device *real_dev = vlan_dev_info(dev)->real_dev;
 644         int subclass = 0;
 645
 646         netif_carrier_off(dev);
 647
 648         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 649         dev->flags  = real_dev->flags & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI);
 650         dev->iflink = real_dev->ifindex;
 651         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 652                                           (1<<__LINK_STATE_DORMANT))) |
 653                       (1<<__LINK_STATE_PRESENT);
 654
 655         dev->features |= real_dev->features & real_dev->vlan_features;
 656         dev->gso_max_size = real_dev->gso_max_size;
 657
 658         /* ipv6 shared card related stuff */
 659         dev->dev_id = real_dev->dev_id;
 660
 661         if (is_zero_ether_addr(dev->dev_addr))
 662                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 663         if (is_zero_ether_addr(dev->broadcast))
 664                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 665
 666 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 667         dev->fcoe_ddp_xid = real_dev->fcoe_ddp_xid;
 668 #endif
 669
 670         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 671                 dev->header_ops      = real_dev->header_ops;
 672                 dev->hard_header_len = real_dev->hard_header_len;
 673                 dev->netdev_ops         = &vlan_netdev_accel_ops;
 674         } else {
 675                 dev->header_ops      = &vlan_header_ops;
 676                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 677                 dev->netdev_ops         = &vlan_netdev_ops;
 678         }
 679
 680         if (is_vlan_dev(real_dev))
 681                 subclass = 1;
 682
 683         vlan_dev_set_lockdep_class(dev, subclass);
 684         return 0;
 685 }
 686
 687 static void vlan_dev_uninit(struct net_device *dev)
 688 {
 689         struct vlan_priority_tci_mapping *pm;
 690         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 691         int i;
 692
 693         for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 694                 while ((pm = vlan->egress_priority_map[i]) != NULL) {
 695                         vlan->egress_priority_map[i] = pm->next;
 696                         kfree(pm);
 697                 }
 698         }
 699 }
 700
 701 static int vlan_ethtool_get_settings(struct net_device *dev,
 702                                      struct ethtool_cmd *cmd)
 703 {
 704         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 705         return dev_ethtool_get_settings(vlan->real_dev, cmd);
 706 }
 707
 708 static void vlan_ethtool_get_drvinfo(struct net_device *dev,
 709                                      struct ethtool_drvinfo *info)
 710 {
 711         strcpy(info->driver, vlan_fullname);
 712         strcpy(info->version, vlan_version);
 713         strcpy(info->fw_version, "N/A");
 714 }
 715
 716 static u32 vlan_ethtool_get_rx_csum(struct net_device *dev)
 717 {
 718         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 719         return dev_ethtool_get_rx_csum(vlan->real_dev);
 720 }
 721
 722 static u32 vlan_ethtool_get_flags(struct net_device *dev)
 723 {
 724         const struct vlan_dev_info *vlan = vlan_dev_info(dev);
 725         return dev_ethtool_get_flags(vlan->real_dev);
 726 }
 727
 728 static const struct ethtool_ops vlan_ethtool_ops = {
 729         .get_settings           = vlan_ethtool_get_settings,
 730         .get_drvinfo            = vlan_ethtool_get_drvinfo,
 731         .get_link               = ethtool_op_get_link,
 732         .get_rx_csum            = vlan_ethtool_get_rx_csum,
 733         .get_flags              = vlan_ethtool_get_flags,
 734 };
 735
 736 static const struct net_device_ops vlan_netdev_ops = {
 737         .ndo_change_mtu         = vlan_dev_change_mtu,
 738         .ndo_init               = vlan_dev_init,
 739         .ndo_uninit             = vlan_dev_uninit,
 740         .ndo_open               = vlan_dev_open,
 741         .ndo_stop               = vlan_dev_stop,
 742         .ndo_start_xmit =  vlan_dev_hard_start_xmit,
 743         .ndo_validate_addr      = eth_validate_addr,
 744         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 745         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 746         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 747         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 748         .ndo_do_ioctl           = vlan_dev_ioctl,
 749         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 750 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 751         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 752         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 753 #endif
 754 };
 755
 756 static const struct net_device_ops vlan_netdev_accel_ops = {
 757         .ndo_change_mtu         = vlan_dev_change_mtu,
 758         .ndo_init               = vlan_dev_init,
 759         .ndo_uninit             = vlan_dev_uninit,
 760         .ndo_open               = vlan_dev_open,
 761         .ndo_stop               = vlan_dev_stop,
 762         .ndo_start_xmit =  vlan_dev_hwaccel_hard_start_xmit,
 763         .ndo_validate_addr      = eth_validate_addr,
 764         .ndo_set_mac_address    = vlan_dev_set_mac_address,
 765         .ndo_set_rx_mode        = vlan_dev_set_rx_mode,
 766         .ndo_set_multicast_list = vlan_dev_set_rx_mode,
 767         .ndo_change_rx_flags    = vlan_dev_change_rx_flags,
 768         .ndo_do_ioctl           = vlan_dev_ioctl,
 769         .ndo_neigh_setup        = vlan_dev_neigh_setup,
 770 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 771         .ndo_fcoe_ddp_setup     = vlan_dev_fcoe_ddp_setup,
 772         .ndo_fcoe_ddp_done      = vlan_dev_fcoe_ddp_done,
 773 #endif
 774 };
 775
 776 void vlan_setup(struct net_device *dev)
 777 {
 778         ether_setup(dev);
 779
 780         dev->priv_flags         |= IFF_802_1Q_VLAN;
 781         dev->priv_flags         &= ~IFF_XMIT_DST_RELEASE;
 782         dev->tx_queue_len       = 0;
 783
 784         dev->netdev_ops         = &vlan_netdev_ops;
 785         dev->destructor         = free_netdev;
 786         dev->ethtool_ops        = &vlan_ethtool_ops;
 787
 788         memset(dev->broadcast, 0, ETH_ALEN);
 789 }