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)
 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);
 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);
 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         netdev_update_features(vlandev);
 332 }
 333
 334 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 335 {
 336         int err = 0;
 337
 338         switch (event) {
 339         case NETDEV_CHANGENAME:
 340                 vlan_proc_rem_dev(dev);
 341                 err = vlan_proc_add_dev(dev);
 342                 break;
 343         case NETDEV_REGISTER:
 344                 err = vlan_proc_add_dev(dev);
 345                 break;
 346         case NETDEV_UNREGISTER:
 347                 vlan_proc_rem_dev(dev);
 348                 break;
 349         }
 350
 351         return err;
 352 }
 353
 354 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 355                              void *ptr)
 356 {
 357         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 358         struct vlan_group *grp;
 359         struct vlan_info *vlan_info;
 360         int i, flgs;
 361         struct net_device *vlandev;
 362         struct vlan_dev_priv *vlan;
 363         bool last = false;
 364         LIST_HEAD(list);
 365
 366         if (is_vlan_dev(dev)) {
 367                 int err = __vlan_device_event(dev, event);
 368
 369                 if (err)
 370                         return notifier_from_errno(err);
 371         }
 372
 373         if ((event == NETDEV_UP) &&
 374             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 375                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 376                         dev->name);
 377                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 378         }
 379         if (event == NETDEV_DOWN &&
 380             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 381                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 382
 383         vlan_info = rtnl_dereference(dev->vlan_info);
 384         if (!vlan_info)
 385                 goto out;
 386         grp = &vlan_info->grp;
 387
 388         /* It is OK that we do not hold the group lock right now,
 389          * as we run under the RTNL lock.
 390          */
 391
 392         switch (event) {
 393         case NETDEV_CHANGE:
 394                 /* Propagate real device state to vlan devices */
 395                 vlan_group_for_each_dev(grp, i, vlandev)
 396                         netif_stacked_transfer_operstate(dev, vlandev);
 397                 break;
 398
 399         case NETDEV_CHANGEADDR:
 400                 /* Adjust unicast filters on underlying device */
 401                 vlan_group_for_each_dev(grp, i, vlandev) {
 402                         flgs = vlandev->flags;
 403                         if (!(flgs & IFF_UP))
 404                                 continue;
 405
 406                         vlan_sync_address(dev, vlandev);
 407                 }
 408                 break;
 409
 410         case NETDEV_CHANGEMTU:
 411                 vlan_group_for_each_dev(grp, i, vlandev) {
 412                         if (vlandev->mtu <= dev->mtu)
 413                                 continue;
 414
 415                         dev_set_mtu(vlandev, dev->mtu);
 416                 }
 417                 break;
 418
 419         case NETDEV_FEAT_CHANGE:
 420                 /* Propagate device features to underlying device */
 421                 vlan_group_for_each_dev(grp, i, vlandev)
 422                         vlan_transfer_features(dev, vlandev);
 423                 break;
 424
 425         case NETDEV_DOWN: {
 426                 struct net_device *tmp;
 427                 LIST_HEAD(close_list);
 428
 429                 /* Put all VLANs for this dev in the down state too.  */
 430                 vlan_group_for_each_dev(grp, i, vlandev) {
 431                         flgs = vlandev->flags;
 432                         if (!(flgs & IFF_UP))
 433                                 continue;
 434
 435                         vlan = vlan_dev_priv(vlandev);
 436                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 437                                 list_add(&vlandev->close_list, &close_list);
 438                 }
 439
 440                 dev_close_many(&close_list, false);
 441
 442                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 443                         netif_stacked_transfer_operstate(dev, vlandev);
 444                         list_del_init(&vlandev->close_list);
 445                 }
 446                 list_del(&close_list);
 447                 break;
 448         }
 449         case NETDEV_UP:
 450                 /* Put all VLANs for this dev in the up state too.  */
 451                 vlan_group_for_each_dev(grp, i, vlandev) {
 452                         flgs = dev_get_flags(vlandev);
 453                         if (flgs & IFF_UP)
 454                                 continue;
 455
 456                         vlan = vlan_dev_priv(vlandev);
 457                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 458                                 dev_change_flags(vlandev, flgs | IFF_UP);
 459                         netif_stacked_transfer_operstate(dev, vlandev);
 460                 }
 461                 break;
 462
 463         case NETDEV_UNREGISTER:
 464                 /* twiddle thumbs on netns device moves */
 465                 if (dev->reg_state != NETREG_UNREGISTERING)
 466                         break;
 467
 468                 vlan_group_for_each_dev(grp, i, vlandev) {
 469                         /* removal of last vid destroys vlan_info, abort
 470                          * afterwards */
 471                         if (vlan_info->nr_vids == 1)
 472                                 last = true;
 473
 474                         unregister_vlan_dev(vlandev, &list);
 475                         if (last)
 476                                 break;
 477                 }
 478                 unregister_netdevice_many(&list);
 479                 break;
 480
 481         case NETDEV_PRE_TYPE_CHANGE:
 482                 /* Forbid underlaying device to change its type. */
 483                 if (vlan_uses_dev(dev))
 484                         return NOTIFY_BAD;
 485                 break;
 486
 487         case NETDEV_NOTIFY_PEERS:
 488         case NETDEV_BONDING_FAILOVER:
 489         case NETDEV_RESEND_IGMP:
 490                 /* Propagate to vlan devices */
 491                 vlan_group_for_each_dev(grp, i, vlandev)
 492                         call_netdevice_notifiers(event, vlandev);
 493                 break;
 494         }
 495
 496 out:
 497         return NOTIFY_DONE;
 498 }
 499
 500 static struct notifier_block vlan_notifier_block __read_mostly = {
 501         .notifier_call = vlan_device_event,
 502 };
 503
 504 /*
 505  *      VLAN IOCTL handler.
 506  *      o execute requested action or pass command to the device driver
 507  *   arg is really a struct vlan_ioctl_args __user *.
 508  */
 509 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 510 {
 511         int err;
 512         struct vlan_ioctl_args args;
 513         struct net_device *dev = NULL;
 514
 515         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 516                 return -EFAULT;
 517
 518         /* Null terminate this sucker, just in case. */
 519         args.device1[sizeof(args.device1) - 1] = 0;
 520         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 521
 522         rtnl_lock();
 523
 524         switch (args.cmd) {
 525         case SET_VLAN_INGRESS_PRIORITY_CMD:
 526         case SET_VLAN_EGRESS_PRIORITY_CMD:
 527         case SET_VLAN_FLAG_CMD:
 528         case ADD_VLAN_CMD:
 529         case DEL_VLAN_CMD:
 530         case GET_VLAN_REALDEV_NAME_CMD:
 531         case GET_VLAN_VID_CMD:
 532                 err = -ENODEV;
 533                 dev = __dev_get_by_name(net, args.device1);
 534                 if (!dev)
 535                         goto out;
 536
 537                 err = -EINVAL;
 538                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 539                         goto out;
 540         }
 541
 542         switch (args.cmd) {
 543         case SET_VLAN_INGRESS_PRIORITY_CMD:
 544                 err = -EPERM;
 545                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 546                         break;
 547                 vlan_dev_set_ingress_priority(dev,
 548                                               args.u.skb_priority,
 549                                               args.vlan_qos);
 550                 err = 0;
 551                 break;
 552
 553         case SET_VLAN_EGRESS_PRIORITY_CMD:
 554                 err = -EPERM;
 555                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 556                         break;
 557                 err = vlan_dev_set_egress_priority(dev,
 558                                                    args.u.skb_priority,
 559                                                    args.vlan_qos);
 560                 break;
 561
 562         case SET_VLAN_FLAG_CMD:
 563                 err = -EPERM;
 564                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 565                         break;
 566                 err = vlan_dev_change_flags(dev,
 567                                             args.vlan_qos ? args.u.flag : 0,
 568                                             args.u.flag);
 569                 break;
 570
 571         case SET_VLAN_NAME_TYPE_CMD:
 572                 err = -EPERM;
 573                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 574                         break;
 575                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 576                         struct vlan_net *vn;
 577
 578                         vn = net_generic(net, vlan_net_id);
 579                         vn->name_type = args.u.name_type;
 580                         err = 0;
 581                 } else {
 582                         err = -EINVAL;
 583                 }
 584                 break;
 585
 586         case ADD_VLAN_CMD:
 587                 err = -EPERM;
 588                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 589                         break;
 590                 err = register_vlan_device(dev, args.u.VID);
 591                 break;
 592
 593         case DEL_VLAN_CMD:
 594                 err = -EPERM;
 595                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 596                         break;
 597                 unregister_vlan_dev(dev, NULL);
 598                 err = 0;
 599                 break;
 600
 601         case GET_VLAN_REALDEV_NAME_CMD:
 602                 err = 0;
 603                 vlan_dev_get_realdev_name(dev, args.u.device2);
 604                 if (copy_to_user(arg, &args,
 605                                  sizeof(struct vlan_ioctl_args)))
 606                         err = -EFAULT;
 607                 break;
 608
 609         case GET_VLAN_VID_CMD:
 610                 err = 0;
 611                 args.u.VID = vlan_dev_vlan_id(dev);
 612                 if (copy_to_user(arg, &args,
 613                                  sizeof(struct vlan_ioctl_args)))
 614                       err = -EFAULT;
 615                 break;
 616
 617         default:
 618                 err = -EOPNOTSUPP;
 619                 break;
 620         }
 621 out:
 622         rtnl_unlock();
 623         return err;
 624 }
 625
 626 static struct sk_buff **vlan_gro_receive(struct sk_buff **head,
 627                                          struct sk_buff *skb)
 628 {
 629         struct sk_buff *p, **pp = NULL;
 630         struct vlan_hdr *vhdr;
 631         unsigned int hlen, off_vlan;
 632         const struct packet_offload *ptype;
 633         __be16 type;
 634         int flush = 1;
 635
 636         off_vlan = skb_gro_offset(skb);
 637         hlen = off_vlan + sizeof(*vhdr);
 638         vhdr = skb_gro_header_fast(skb, off_vlan);
 639         if (skb_gro_header_hard(skb, hlen)) {
 640                 vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
 641                 if (unlikely(!vhdr))
 642                         goto out;
 643         }
 644
 645         type = vhdr->h_vlan_encapsulated_proto;
 646
 647         rcu_read_lock();
 648         ptype = gro_find_receive_by_type(type);
 649         if (!ptype)
 650                 goto out_unlock;
 651
 652         flush = 0;
 653
 654         for (p = *head; p; p = p->next) {
 655                 struct vlan_hdr *vhdr2;
 656
 657                 if (!NAPI_GRO_CB(p)->same_flow)
 658                         continue;
 659
 660                 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
 661                 if (compare_vlan_header(vhdr, vhdr2))
 662                         NAPI_GRO_CB(p)->same_flow = 0;
 663         }
 664
 665         skb_gro_pull(skb, sizeof(*vhdr));
 666         skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
 667         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 668
 669 out_unlock:
 670         rcu_read_unlock();
 671 out:
 672         NAPI_GRO_CB(skb)->flush |= flush;
 673
 674         return pp;
 675 }
 676
 677 static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
 678 {
 679         struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
 680         __be16 type = vhdr->h_vlan_encapsulated_proto;
 681         struct packet_offload *ptype;
 682         int err = -ENOENT;
 683
 684         rcu_read_lock();
 685         ptype = gro_find_complete_by_type(type);
 686         if (ptype)
 687                 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
 688
 689         rcu_read_unlock();
 690         return err;
 691 }
 692
 693 static struct packet_offload vlan_packet_offloads[] __read_mostly = {
 694         {
 695                 .type = cpu_to_be16(ETH_P_8021Q),
 696                 .priority = 10,
 697                 .callbacks = {
 698                         .gro_receive = vlan_gro_receive,
 699                         .gro_complete = vlan_gro_complete,
 700                 },
 701         },
 702         {
 703                 .type = cpu_to_be16(ETH_P_8021AD),
 704                 .priority = 10,
 705                 .callbacks = {
 706                         .gro_receive = vlan_gro_receive,
 707                         .gro_complete = vlan_gro_complete,
 708                 },
 709         },
 710 };
 711
 712 static int __net_init vlan_init_net(struct net *net)
 713 {
 714         struct vlan_net *vn = net_generic(net, vlan_net_id);
 715         int err;
 716
 717         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 718
 719         err = vlan_proc_init(net);
 720
 721         return err;
 722 }
 723
 724 static void __net_exit vlan_exit_net(struct net *net)
 725 {
 726         vlan_proc_cleanup(net);
 727 }
 728
 729 static struct pernet_operations vlan_net_ops = {
 730         .init = vlan_init_net,
 731         .exit = vlan_exit_net,
 732         .id   = &vlan_net_id,
 733         .size = sizeof(struct vlan_net),
 734 };
 735
 736 static int __init vlan_proto_init(void)
 737 {
 738         int err;
 739         unsigned int i;
 740
 741         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 742
 743         err = register_pernet_subsys(&vlan_net_ops);
 744         if (err < 0)
 745                 goto err0;
 746
 747         err = register_netdevice_notifier(&vlan_notifier_block);
 748         if (err < 0)
 749                 goto err2;
 750
 751         err = vlan_gvrp_init();
 752         if (err < 0)
 753                 goto err3;
 754
 755         err = vlan_mvrp_init();
 756         if (err < 0)
 757                 goto err4;
 758
 759         err = vlan_netlink_init();
 760         if (err < 0)
 761                 goto err5;
 762
 763         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 764                 dev_add_offload(&vlan_packet_offloads[i]);
 765
 766         vlan_ioctl_set(vlan_ioctl_handler);
 767         return 0;
 768
 769 err5:
 770         vlan_mvrp_uninit();
 771 err4:
 772         vlan_gvrp_uninit();
 773 err3:
 774         unregister_netdevice_notifier(&vlan_notifier_block);
 775 err2:
 776         unregister_pernet_subsys(&vlan_net_ops);
 777 err0:
 778         return err;
 779 }
 780
 781 static void __exit vlan_cleanup_module(void)
 782 {
 783         unsigned int i;
 784
 785         vlan_ioctl_set(NULL);
 786
 787         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 788                 dev_remove_offload(&vlan_packet_offloads[i]);
 789
 790         vlan_netlink_fini();
 791
 792         unregister_netdevice_notifier(&vlan_notifier_block);
 793
 794         unregister_pernet_subsys(&vlan_net_ops);
 795         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 796
 797         vlan_mvrp_uninit();
 798         vlan_gvrp_uninit();
 799 }
 800
 801 module_init(vlan_proto_init);
 802 module_exit(vlan_cleanup_module);
 803
 804 MODULE_LICENSE("GPL");
 805 MODULE_VERSION(DRV_VERSION);