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