net/8021q/vlan.c

   1 /*
   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:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/capability.h>
  24 #include <linux/module.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/rculist.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34 #include <net/rtnetlink.h>
  35 #include <net/net_namespace.h>
  36 #include <net/netns/generic.h>
  37 #include <linux/uaccess.h>
  38
  39 #include <linux/if_vlan.h>
  40 #include "vlan.h"
  41 #include "vlanproc.h"
  42
  43 #define DRV_VERSION "1.8"
  44
  45 /* Global VLAN variables */
  46
  47 unsigned int vlan_net_id __read_mostly;
  48
  49 const char vlan_fullname[] = "802.1Q VLAN Support";
  50 const char vlan_version[] = DRV_VERSION;
  51
  52 /* End of global variables definitions. */
  53
  54 static int vlan_group_prealloc_vid(struct vlan_group *vg,
  55                                    __be16 vlan_proto, u16 vlan_id)
  56 {
  57         struct net_device **array;
  58         unsigned int pidx, vidx;
  59         unsigned int size;
  60
  61         ASSERT_RTNL();
  62
  63         pidx  = vlan_proto_idx(vlan_proto);
  64         vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
  65         array = vg->vlan_devices_arrays[pidx][vidx];
  66         if (array != NULL)
  67                 return 0;
  68
  69         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
  70         array = kzalloc(size, GFP_KERNEL);
  71         if (array == NULL)
  72                 return -ENOBUFS;
  73
  74         vg->vlan_devices_arrays[pidx][vidx] = array;
  75         return 0;
  76 }
  77
  78 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
  79 {
  80         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  81         struct net_device *real_dev = vlan->real_dev;
  82         struct vlan_info *vlan_info;
  83         struct vlan_group *grp;
  84         u16 vlan_id = vlan->vlan_id;
  85
  86         ASSERT_RTNL();
  87
  88         vlan_info = rtnl_dereference(real_dev->vlan_info);
  89         BUG_ON(!vlan_info);
  90
  91         grp = &vlan_info->grp;
  92
  93         grp->nr_vlan_devs--;
  94
  95         if (vlan->flags & VLAN_FLAG_MVRP)
  96                 vlan_mvrp_request_leave(dev);
  97         if (vlan->flags & VLAN_FLAG_GVRP)
  98                 vlan_gvrp_request_leave(dev);
  99
 100         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
 101
 102         netdev_upper_dev_unlink(real_dev, dev);
 103         /* Because unregister_netdevice_queue() makes sure at least one rcu
 104          * grace period is respected before device freeing,
 105          * we dont need to call synchronize_net() here.
 106          */
 107         unregister_netdevice_queue(dev, head);
 108
 109         if (grp->nr_vlan_devs == 0) {
 110                 vlan_mvrp_uninit_applicant(real_dev);
 111                 vlan_gvrp_uninit_applicant(real_dev);
 112         }
 113
 114         /* Take it out of our own structures, but be sure to interlock with
 115          * HW accelerating devices or SW vlan input packet processing if
 116          * VLAN is not 0 (leave it there for 802.1p).
 117          */
 118         if (vlan_id)
 119                 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 120
 121         /* Get rid of the vlan's reference to real_dev */
 122         dev_put(real_dev);
 123 }
 124
 125 int vlan_check_real_dev(struct net_device *real_dev,
 126                         __be16 protocol, u16 vlan_id)
 127 {
 128         const char *name = real_dev->name;
 129
 130         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 131                 pr_info("VLANs not supported on %s\n", name);
 132                 return -EOPNOTSUPP;
 133         }
 134
 135         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL)
 136                 return -EEXIST;
 137
 138         return 0;
 139 }
 140
 141 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 142 {
 143         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 144         struct net_device *real_dev = vlan->real_dev;
 145         u16 vlan_id = vlan->vlan_id;
 146         struct vlan_info *vlan_info;
 147         struct vlan_group *grp;
 148         int err;
 149
 150         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 151         if (err)
 152                 return err;
 153
 154         vlan_info = rtnl_dereference(real_dev->vlan_info);
 155         /* vlan_info should be there now. vlan_vid_add took care of it */
 156         BUG_ON(!vlan_info);
 157
 158         grp = &vlan_info->grp;
 159         if (grp->nr_vlan_devs == 0) {
 160                 err = vlan_gvrp_init_applicant(real_dev);
 161                 if (err < 0)
 162                         goto out_vid_del;
 163                 err = vlan_mvrp_init_applicant(real_dev);
 164                 if (err < 0)
 165                         goto out_uninit_gvrp;
 166         }
 167
 168         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 169         if (err < 0)
 170                 goto out_uninit_mvrp;
 171
 172         vlan->nest_level = dev_get_nest_level(real_dev) + 1;
 173         err = register_netdevice(dev);
 174         if (err < 0)
 175                 goto out_uninit_mvrp;
 176
 177         err = netdev_upper_dev_link(real_dev, dev, extack);
 178         if (err)
 179                 goto out_unregister_netdev;
 180
 181         /* Account for reference in struct vlan_dev_priv */
 182         dev_hold(real_dev);
 183
 184         netif_stacked_transfer_operstate(real_dev, dev);
 185         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 186
 187         /* So, got the sucker initialized, now lets place
 188          * it into our local structure.
 189          */
 190         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 191         grp->nr_vlan_devs++;
 192
 193         return 0;
 194
 195 out_unregister_netdev:
 196         unregister_netdevice(dev);
 197 out_uninit_mvrp:
 198         if (grp->nr_vlan_devs == 0)
 199                 vlan_mvrp_uninit_applicant(real_dev);
 200 out_uninit_gvrp:
 201         if (grp->nr_vlan_devs == 0)
 202                 vlan_gvrp_uninit_applicant(real_dev);
 203 out_vid_del:
 204         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 205         return err;
 206 }
 207
 208 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 209  *  Returns 0 if the device was created or a negative error code otherwise.
 210  */
 211 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 212 {
 213         struct net_device *new_dev;
 214         struct vlan_dev_priv *vlan;
 215         struct net *net = dev_net(real_dev);
 216         struct vlan_net *vn = net_generic(net, vlan_net_id);
 217         char name[IFNAMSIZ];
 218         int err;
 219
 220         if (vlan_id >= VLAN_VID_MASK)
 221                 return -ERANGE;
 222
 223         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id);
 224         if (err < 0)
 225                 return err;
 226
 227         /* Gotta set up the fields for the device. */
 228         switch (vn->name_type) {
 229         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 230                 /* name will look like:  eth1.0005 */
 231                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 232                 break;
 233         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 234                 /* Put our vlan.VID in the name.
 235                  * Name will look like:  vlan5
 236                  */
 237                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 238                 break;
 239         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 240                 /* Put our vlan.VID in the name.
 241                  * Name will look like:  eth0.5
 242                  */
 243                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 244                 break;
 245         case VLAN_NAME_TYPE_PLUS_VID:
 246                 /* Put our vlan.VID in the name.
 247                  * Name will look like:  vlan0005
 248                  */
 249         default:
 250                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 251         }
 252
 253         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 254                                NET_NAME_UNKNOWN, vlan_setup);
 255
 256         if (new_dev == NULL)
 257                 return -ENOBUFS;
 258
 259         dev_net_set(new_dev, net);
 260         /* need 4 bytes for extra VLAN header info,
 261          * hope the underlying device can handle it.
 262          */
 263         new_dev->mtu = real_dev->mtu;
 264
 265         vlan = vlan_dev_priv(new_dev);
 266         vlan->vlan_proto = htons(ETH_P_8021Q);
 267         vlan->vlan_id = vlan_id;
 268         vlan->real_dev = real_dev;
 269         vlan->dent = NULL;
 270         vlan->flags = VLAN_FLAG_REORDER_HDR;
 271
 272         new_dev->rtnl_link_ops = &vlan_link_ops;
 273         err = register_vlan_dev(new_dev, NULL);
 274         if (err < 0)
 275                 goto out_free_newdev;
 276
 277         return 0;
 278
 279 out_free_newdev:
 280         if (new_dev->reg_state == NETREG_UNINITIALIZED)
 281                 free_netdev(new_dev);
 282         return err;
 283 }
 284
 285 static void vlan_sync_address(struct net_device *dev,
 286                               struct net_device *vlandev)
 287 {
 288         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 289
 290         /* May be called without an actual change */
 291         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 292                 return;
 293
 294         /* vlan continues to inherit address of lower device */
 295         if (vlan_dev_inherit_address(vlandev, dev))
 296                 goto out;
 297
 298         /* vlan address was different from the old address and is equal to
 299          * the new address */
 300         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 301             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 302                 dev_uc_del(dev, vlandev->dev_addr);
 303
 304         /* vlan address was equal to the old address and is different from
 305          * the new address */
 306         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 307             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 308                 dev_uc_add(dev, vlandev->dev_addr);
 309
 310 out:
 311         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 312 }
 313
 314 static void vlan_transfer_features(struct net_device *dev,
 315                                    struct net_device *vlandev)
 316 {
 317         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 318
 319         vlandev->gso_max_size = dev->gso_max_size;
 320         vlandev->gso_max_segs = dev->gso_max_segs;
 321
 322         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 323                 vlandev->hard_header_len = dev->hard_header_len;
 324         else
 325                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 326
 327 #if IS_ENABLED(CONFIG_FCOE)
 328         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 329 #endif
 330
 331         vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 332         vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 333
 334         netdev_update_features(vlandev);
 335 }
 336
 337 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 338 {
 339         int err = 0;
 340
 341         switch (event) {
 342         case NETDEV_CHANGENAME:
 343                 vlan_proc_rem_dev(dev);
 344                 err = vlan_proc_add_dev(dev);
 345                 break;
 346         case NETDEV_REGISTER:
 347                 err = vlan_proc_add_dev(dev);
 348                 break;
 349         case NETDEV_UNREGISTER:
 350                 vlan_proc_rem_dev(dev);
 351                 break;
 352         }
 353
 354         return err;
 355 }
 356
 357 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 358                              void *ptr)
 359 {
 360         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 361         struct vlan_group *grp;
 362         struct vlan_info *vlan_info;
 363         int i, flgs;
 364         struct net_device *vlandev;
 365         struct vlan_dev_priv *vlan;
 366         bool last = false;
 367         LIST_HEAD(list);
 368
 369         if (is_vlan_dev(dev)) {
 370                 int err = __vlan_device_event(dev, event);
 371
 372                 if (err)
 373                         return notifier_from_errno(err);
 374         }
 375
 376         if ((event == NETDEV_UP) &&
 377             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 378                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 379                         dev->name);
 380                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 381         }
 382         if (event == NETDEV_DOWN &&
 383             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 384                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 385
 386         vlan_info = rtnl_dereference(dev->vlan_info);
 387         if (!vlan_info)
 388                 goto out;
 389         grp = &vlan_info->grp;
 390
 391         /* It is OK that we do not hold the group lock right now,
 392          * as we run under the RTNL lock.
 393          */
 394
 395         switch (event) {
 396         case NETDEV_CHANGE:
 397                 /* Propagate real device state to vlan devices */
 398                 vlan_group_for_each_dev(grp, i, vlandev)
 399                         netif_stacked_transfer_operstate(dev, vlandev);
 400                 break;
 401
 402         case NETDEV_CHANGEADDR:
 403                 /* Adjust unicast filters on underlying device */
 404                 vlan_group_for_each_dev(grp, i, vlandev) {
 405                         flgs = vlandev->flags;
 406                         if (!(flgs & IFF_UP))
 407                                 continue;
 408
 409                         vlan_sync_address(dev, vlandev);
 410                 }
 411                 break;
 412
 413         case NETDEV_CHANGEMTU:
 414                 vlan_group_for_each_dev(grp, i, vlandev) {
 415                         if (vlandev->mtu <= dev->mtu)
 416                                 continue;
 417
 418                         dev_set_mtu(vlandev, dev->mtu);
 419                 }
 420                 break;
 421
 422         case NETDEV_FEAT_CHANGE:
 423                 /* Propagate device features to underlying device */
 424                 vlan_group_for_each_dev(grp, i, vlandev)
 425                         vlan_transfer_features(dev, vlandev);
 426                 break;
 427
 428         case NETDEV_DOWN: {
 429                 struct net_device *tmp;
 430                 LIST_HEAD(close_list);
 431
 432                 /* Put all VLANs for this dev in the down state too.  */
 433                 vlan_group_for_each_dev(grp, i, vlandev) {
 434                         flgs = vlandev->flags;
 435                         if (!(flgs & IFF_UP))
 436                                 continue;
 437
 438                         vlan = vlan_dev_priv(vlandev);
 439                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 440                                 list_add(&vlandev->close_list, &close_list);
 441                 }
 442
 443                 dev_close_many(&close_list, false);
 444
 445                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 446                         netif_stacked_transfer_operstate(dev, vlandev);
 447                         list_del_init(&vlandev->close_list);
 448                 }
 449                 list_del(&close_list);
 450                 break;
 451         }
 452         case NETDEV_UP:
 453                 /* Put all VLANs for this dev in the up state too.  */
 454                 vlan_group_for_each_dev(grp, i, vlandev) {
 455                         flgs = dev_get_flags(vlandev);
 456                         if (flgs & IFF_UP)
 457                                 continue;
 458
 459                         vlan = vlan_dev_priv(vlandev);
 460                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 461                                 dev_change_flags(vlandev, flgs | IFF_UP);
 462                         netif_stacked_transfer_operstate(dev, vlandev);
 463                 }
 464                 break;
 465
 466         case NETDEV_UNREGISTER:
 467                 /* twiddle thumbs on netns device moves */
 468                 if (dev->reg_state != NETREG_UNREGISTERING)
 469                         break;
 470
 471                 vlan_group_for_each_dev(grp, i, vlandev) {
 472                         /* removal of last vid destroys vlan_info, abort
 473                          * afterwards */
 474                         if (vlan_info->nr_vids == 1)
 475                                 last = true;
 476
 477                         unregister_vlan_dev(vlandev, &list);
 478                         if (last)
 479                                 break;
 480                 }
 481                 unregister_netdevice_many(&list);
 482                 break;
 483
 484         case NETDEV_PRE_TYPE_CHANGE:
 485                 /* Forbid underlaying device to change its type. */
 486                 if (vlan_uses_dev(dev))
 487                         return NOTIFY_BAD;
 488                 break;
 489
 490         case NETDEV_NOTIFY_PEERS:
 491         case NETDEV_BONDING_FAILOVER:
 492         case NETDEV_RESEND_IGMP:
 493                 /* Propagate to vlan devices */
 494                 vlan_group_for_each_dev(grp, i, vlandev)
 495                         call_netdevice_notifiers(event, vlandev);
 496                 break;
 497         }
 498
 499 out:
 500         return NOTIFY_DONE;
 501 }
 502
 503 static struct notifier_block vlan_notifier_block __read_mostly = {
 504         .notifier_call = vlan_device_event,
 505 };
 506
 507 /*
 508  *      VLAN IOCTL handler.
 509  *      o execute requested action or pass command to the device driver
 510  *   arg is really a struct vlan_ioctl_args __user *.
 511  */
 512 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 513 {
 514         int err;
 515         struct vlan_ioctl_args args;
 516         struct net_device *dev = NULL;
 517
 518         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 519                 return -EFAULT;
 520
 521         /* Null terminate this sucker, just in case. */
 522         args.device1[sizeof(args.device1) - 1] = 0;
 523         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 524
 525         rtnl_lock();
 526
 527         switch (args.cmd) {
 528         case SET_VLAN_INGRESS_PRIORITY_CMD:
 529         case SET_VLAN_EGRESS_PRIORITY_CMD:
 530         case SET_VLAN_FLAG_CMD:
 531         case ADD_VLAN_CMD:
 532         case DEL_VLAN_CMD:
 533         case GET_VLAN_REALDEV_NAME_CMD:
 534         case GET_VLAN_VID_CMD:
 535                 err = -ENODEV;
 536                 dev = __dev_get_by_name(net, args.device1);
 537                 if (!dev)
 538                         goto out;
 539
 540                 err = -EINVAL;
 541                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 542                         goto out;
 543         }
 544
 545         switch (args.cmd) {
 546         case SET_VLAN_INGRESS_PRIORITY_CMD:
 547                 err = -EPERM;
 548                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 549                         break;
 550                 vlan_dev_set_ingress_priority(dev,
 551                                               args.u.skb_priority,
 552                                               args.vlan_qos);
 553                 err = 0;
 554                 break;
 555
 556         case SET_VLAN_EGRESS_PRIORITY_CMD:
 557                 err = -EPERM;
 558                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 559                         break;
 560                 err = vlan_dev_set_egress_priority(dev,
 561                                                    args.u.skb_priority,
 562                                                    args.vlan_qos);
 563                 break;
 564
 565         case SET_VLAN_FLAG_CMD:
 566                 err = -EPERM;
 567                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 568                         break;
 569                 err = vlan_dev_change_flags(dev,
 570                                             args.vlan_qos ? args.u.flag : 0,
 571                                             args.u.flag);
 572                 break;
 573
 574         case SET_VLAN_NAME_TYPE_CMD:
 575                 err = -EPERM;
 576                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 577                         break;
 578                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 579                         struct vlan_net *vn;
 580
 581                         vn = net_generic(net, vlan_net_id);
 582                         vn->name_type = args.u.name_type;
 583                         err = 0;
 584                 } else {
 585                         err = -EINVAL;
 586                 }
 587                 break;
 588
 589         case ADD_VLAN_CMD:
 590                 err = -EPERM;
 591                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 592                         break;
 593                 err = register_vlan_device(dev, args.u.VID);
 594                 break;
 595
 596         case DEL_VLAN_CMD:
 597                 err = -EPERM;
 598                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 599                         break;
 600                 unregister_vlan_dev(dev, NULL);
 601                 err = 0;
 602                 break;
 603
 604         case GET_VLAN_REALDEV_NAME_CMD:
 605                 err = 0;
 606                 vlan_dev_get_realdev_name(dev, args.u.device2);
 607                 if (copy_to_user(arg, &args,
 608                                  sizeof(struct vlan_ioctl_args)))
 609                         err = -EFAULT;
 610                 break;
 611
 612         case GET_VLAN_VID_CMD:
 613                 err = 0;
 614                 args.u.VID = vlan_dev_vlan_id(dev);
 615                 if (copy_to_user(arg, &args,
 616                                  sizeof(struct vlan_ioctl_args)))
 617                       err = -EFAULT;
 618                 break;
 619
 620         default:
 621                 err = -EOPNOTSUPP;
 622                 break;
 623         }
 624 out:
 625         rtnl_unlock();
 626         return err;
 627 }
 628
 629 static struct sk_buff **vlan_gro_receive(struct sk_buff **head,
 630                                          struct sk_buff *skb)
 631 {
 632         struct sk_buff *p, **pp = NULL;
 633         struct vlan_hdr *vhdr;
 634         unsigned int hlen, off_vlan;
 635         const struct packet_offload *ptype;
 636         __be16 type;
 637         int flush = 1;
 638
 639         off_vlan = skb_gro_offset(skb);
 640         hlen = off_vlan + sizeof(*vhdr);
 641         vhdr = skb_gro_header_fast(skb, off_vlan);
 642         if (skb_gro_header_hard(skb, hlen)) {
 643                 vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
 644                 if (unlikely(!vhdr))
 645                         goto out;
 646         }
 647
 648         type = vhdr->h_vlan_encapsulated_proto;
 649
 650         rcu_read_lock();
 651         ptype = gro_find_receive_by_type(type);
 652         if (!ptype)
 653                 goto out_unlock;
 654
 655         flush = 0;
 656
 657         for (p = *head; p; p = p->next) {
 658                 struct vlan_hdr *vhdr2;
 659
 660                 if (!NAPI_GRO_CB(p)->same_flow)
 661                         continue;
 662
 663                 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
 664                 if (compare_vlan_header(vhdr, vhdr2))
 665                         NAPI_GRO_CB(p)->same_flow = 0;
 666         }
 667
 668         skb_gro_pull(skb, sizeof(*vhdr));
 669         skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
 670         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 671
 672 out_unlock:
 673         rcu_read_unlock();
 674 out:
 675         NAPI_GRO_CB(skb)->flush |= flush;
 676
 677         return pp;
 678 }
 679
 680 static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
 681 {
 682         struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
 683         __be16 type = vhdr->h_vlan_encapsulated_proto;
 684         struct packet_offload *ptype;
 685         int err = -ENOENT;
 686
 687         rcu_read_lock();
 688         ptype = gro_find_complete_by_type(type);
 689         if (ptype)
 690                 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
 691
 692         rcu_read_unlock();
 693         return err;
 694 }
 695
 696 static struct packet_offload vlan_packet_offloads[] __read_mostly = {
 697         {
 698                 .type = cpu_to_be16(ETH_P_8021Q),
 699                 .priority = 10,
 700                 .callbacks = {
 701                         .gro_receive = vlan_gro_receive,
 702                         .gro_complete = vlan_gro_complete,
 703                 },
 704         },
 705         {
 706                 .type = cpu_to_be16(ETH_P_8021AD),
 707                 .priority = 10,
 708                 .callbacks = {
 709                         .gro_receive = vlan_gro_receive,
 710                         .gro_complete = vlan_gro_complete,
 711                 },
 712         },
 713 };
 714
 715 static int __net_init vlan_init_net(struct net *net)
 716 {
 717         struct vlan_net *vn = net_generic(net, vlan_net_id);
 718         int err;
 719
 720         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 721
 722         err = vlan_proc_init(net);
 723
 724         return err;
 725 }
 726
 727 static void __net_exit vlan_exit_net(struct net *net)
 728 {
 729         vlan_proc_cleanup(net);
 730 }
 731
 732 static struct pernet_operations vlan_net_ops = {
 733         .init = vlan_init_net,
 734         .exit = vlan_exit_net,
 735         .id   = &vlan_net_id,
 736         .size = sizeof(struct vlan_net),
 737 };
 738
 739 static int __init vlan_proto_init(void)
 740 {
 741         int err;
 742         unsigned int i;
 743
 744         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 745
 746         err = register_pernet_subsys(&vlan_net_ops);
 747         if (err < 0)
 748                 goto err0;
 749
 750         err = register_netdevice_notifier(&vlan_notifier_block);
 751         if (err < 0)
 752                 goto err2;
 753
 754         err = vlan_gvrp_init();
 755         if (err < 0)
 756                 goto err3;
 757
 758         err = vlan_mvrp_init();
 759         if (err < 0)
 760                 goto err4;
 761
 762         err = vlan_netlink_init();
 763         if (err < 0)
 764                 goto err5;
 765
 766         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 767                 dev_add_offload(&vlan_packet_offloads[i]);
 768
 769         vlan_ioctl_set(vlan_ioctl_handler);
 770         return 0;
 771
 772 err5:
 773         vlan_mvrp_uninit();
 774 err4:
 775         vlan_gvrp_uninit();
 776 err3:
 777         unregister_netdevice_notifier(&vlan_notifier_block);
 778 err2:
 779         unregister_pernet_subsys(&vlan_net_ops);
 780 err0:
 781         return err;
 782 }
 783
 784 static void __exit vlan_cleanup_module(void)
 785 {
 786         unsigned int i;
 787
 788         vlan_ioctl_set(NULL);
 789
 790         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 791                 dev_remove_offload(&vlan_packet_offloads[i]);
 792
 793         vlan_netlink_fini();
 794
 795         unregister_netdevice_notifier(&vlan_notifier_block);
 796
 797         unregister_pernet_subsys(&vlan_net_ops);
 798         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 799
 800         vlan_mvrp_uninit();
 801         vlan_gvrp_uninit();
 802 }
 803
 804 module_init(vlan_proto_init);
 805 module_exit(vlan_cleanup_module);
 806
 807 MODULE_LICENSE("GPL");
 808 MODULE_VERSION(DRV_VERSION);