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                 free_netdev(new_dev);
 277         return err;
 278 }
 279
 280 static void vlan_sync_address(struct net_device *dev,
 281                               struct net_device *vlandev)
 282 {
 283         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 284
 285         /* May be called without an actual change */
 286         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 287                 return;
 288
 289         /* vlan continues to inherit address of lower device */
 290         if (vlan_dev_inherit_address(vlandev, dev))
 291                 goto out;
 292
 293         /* vlan address was different from the old address and is equal to
 294          * the new address */
 295         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 296             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 297                 dev_uc_del(dev, vlandev->dev_addr);
 298
 299         /* vlan address was equal to the old address and is different from
 300          * the new address */
 301         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 302             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 303                 dev_uc_add(dev, vlandev->dev_addr);
 304
 305 out:
 306         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 307 }
 308
 309 static void vlan_transfer_features(struct net_device *dev,
 310                                    struct net_device *vlandev)
 311 {
 312         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 313
 314         vlandev->gso_max_size = dev->gso_max_size;
 315         vlandev->gso_max_segs = dev->gso_max_segs;
 316
 317         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 318                 vlandev->hard_header_len = dev->hard_header_len;
 319         else
 320                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 321
 322 #if IS_ENABLED(CONFIG_FCOE)
 323         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 324 #endif
 325
 326         netdev_update_features(vlandev);
 327 }
 328
 329 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 330 {
 331         int err = 0;
 332
 333         switch (event) {
 334         case NETDEV_CHANGENAME:
 335                 vlan_proc_rem_dev(dev);
 336                 err = vlan_proc_add_dev(dev);
 337                 break;
 338         case NETDEV_REGISTER:
 339                 err = vlan_proc_add_dev(dev);
 340                 break;
 341         case NETDEV_UNREGISTER:
 342                 vlan_proc_rem_dev(dev);
 343                 break;
 344         }
 345
 346         return err;
 347 }
 348
 349 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 350                              void *ptr)
 351 {
 352         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 353         struct vlan_group *grp;
 354         struct vlan_info *vlan_info;
 355         int i, flgs;
 356         struct net_device *vlandev;
 357         struct vlan_dev_priv *vlan;
 358         bool last = false;
 359         LIST_HEAD(list);
 360
 361         if (is_vlan_dev(dev)) {
 362                 int err = __vlan_device_event(dev, event);
 363
 364                 if (err)
 365                         return notifier_from_errno(err);
 366         }
 367
 368         if ((event == NETDEV_UP) &&
 369             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 370                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 371                         dev->name);
 372                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 373         }
 374         if (event == NETDEV_DOWN &&
 375             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 376                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 377
 378         vlan_info = rtnl_dereference(dev->vlan_info);
 379         if (!vlan_info)
 380                 goto out;
 381         grp = &vlan_info->grp;
 382
 383         /* It is OK that we do not hold the group lock right now,
 384          * as we run under the RTNL lock.
 385          */
 386
 387         switch (event) {
 388         case NETDEV_CHANGE:
 389                 /* Propagate real device state to vlan devices */
 390                 vlan_group_for_each_dev(grp, i, vlandev)
 391                         netif_stacked_transfer_operstate(dev, vlandev);
 392                 break;
 393
 394         case NETDEV_CHANGEADDR:
 395                 /* Adjust unicast filters on underlying device */
 396                 vlan_group_for_each_dev(grp, i, vlandev) {
 397                         flgs = vlandev->flags;
 398                         if (!(flgs & IFF_UP))
 399                                 continue;
 400
 401                         vlan_sync_address(dev, vlandev);
 402                 }
 403                 break;
 404
 405         case NETDEV_CHANGEMTU:
 406                 vlan_group_for_each_dev(grp, i, vlandev) {
 407                         if (vlandev->mtu <= dev->mtu)
 408                                 continue;
 409
 410                         dev_set_mtu(vlandev, dev->mtu);
 411                 }
 412                 break;
 413
 414         case NETDEV_FEAT_CHANGE:
 415                 /* Propagate device features to underlying device */
 416                 vlan_group_for_each_dev(grp, i, vlandev)
 417                         vlan_transfer_features(dev, vlandev);
 418                 break;
 419
 420         case NETDEV_DOWN: {
 421                 struct net_device *tmp;
 422                 LIST_HEAD(close_list);
 423
 424                 /* Put all VLANs for this dev in the down state too.  */
 425                 vlan_group_for_each_dev(grp, i, vlandev) {
 426                         flgs = vlandev->flags;
 427                         if (!(flgs & IFF_UP))
 428                                 continue;
 429
 430                         vlan = vlan_dev_priv(vlandev);
 431                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 432                                 list_add(&vlandev->close_list, &close_list);
 433                 }
 434
 435                 dev_close_many(&close_list, false);
 436
 437                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 438                         netif_stacked_transfer_operstate(dev, vlandev);
 439                         list_del_init(&vlandev->close_list);
 440                 }
 441                 list_del(&close_list);
 442                 break;
 443         }
 444         case NETDEV_UP:
 445                 /* Put all VLANs for this dev in the up state too.  */
 446                 vlan_group_for_each_dev(grp, i, vlandev) {
 447                         flgs = dev_get_flags(vlandev);
 448                         if (flgs & IFF_UP)
 449                                 continue;
 450
 451                         vlan = vlan_dev_priv(vlandev);
 452                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 453                                 dev_change_flags(vlandev, flgs | IFF_UP);
 454                         netif_stacked_transfer_operstate(dev, vlandev);
 455                 }
 456                 break;
 457
 458         case NETDEV_UNREGISTER:
 459                 /* twiddle thumbs on netns device moves */
 460                 if (dev->reg_state != NETREG_UNREGISTERING)
 461                         break;
 462
 463                 vlan_group_for_each_dev(grp, i, vlandev) {
 464                         /* removal of last vid destroys vlan_info, abort
 465                          * afterwards */
 466                         if (vlan_info->nr_vids == 1)
 467                                 last = true;
 468
 469                         unregister_vlan_dev(vlandev, &list);
 470                         if (last)
 471                                 break;
 472                 }
 473                 unregister_netdevice_many(&list);
 474                 break;
 475
 476         case NETDEV_PRE_TYPE_CHANGE:
 477                 /* Forbid underlaying device to change its type. */
 478                 if (vlan_uses_dev(dev))
 479                         return NOTIFY_BAD;
 480                 break;
 481
 482         case NETDEV_NOTIFY_PEERS:
 483         case NETDEV_BONDING_FAILOVER:
 484         case NETDEV_RESEND_IGMP:
 485                 /* Propagate to vlan devices */
 486                 vlan_group_for_each_dev(grp, i, vlandev)
 487                         call_netdevice_notifiers(event, vlandev);
 488                 break;
 489         }
 490
 491 out:
 492         return NOTIFY_DONE;
 493 }
 494
 495 static struct notifier_block vlan_notifier_block __read_mostly = {
 496         .notifier_call = vlan_device_event,
 497 };
 498
 499 /*
 500  *      VLAN IOCTL handler.
 501  *      o execute requested action or pass command to the device driver
 502  *   arg is really a struct vlan_ioctl_args __user *.
 503  */
 504 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 505 {
 506         int err;
 507         struct vlan_ioctl_args args;
 508         struct net_device *dev = NULL;
 509
 510         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 511                 return -EFAULT;
 512
 513         /* Null terminate this sucker, just in case. */
 514         args.device1[sizeof(args.device1) - 1] = 0;
 515         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 516
 517         rtnl_lock();
 518
 519         switch (args.cmd) {
 520         case SET_VLAN_INGRESS_PRIORITY_CMD:
 521         case SET_VLAN_EGRESS_PRIORITY_CMD:
 522         case SET_VLAN_FLAG_CMD:
 523         case ADD_VLAN_CMD:
 524         case DEL_VLAN_CMD:
 525         case GET_VLAN_REALDEV_NAME_CMD:
 526         case GET_VLAN_VID_CMD:
 527                 err = -ENODEV;
 528                 dev = __dev_get_by_name(net, args.device1);
 529                 if (!dev)
 530                         goto out;
 531
 532                 err = -EINVAL;
 533                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 534                         goto out;
 535         }
 536
 537         switch (args.cmd) {
 538         case SET_VLAN_INGRESS_PRIORITY_CMD:
 539                 err = -EPERM;
 540                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 541                         break;
 542                 vlan_dev_set_ingress_priority(dev,
 543                                               args.u.skb_priority,
 544                                               args.vlan_qos);
 545                 err = 0;
 546                 break;
 547
 548         case SET_VLAN_EGRESS_PRIORITY_CMD:
 549                 err = -EPERM;
 550                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 551                         break;
 552                 err = vlan_dev_set_egress_priority(dev,
 553                                                    args.u.skb_priority,
 554                                                    args.vlan_qos);
 555                 break;
 556
 557         case SET_VLAN_FLAG_CMD:
 558                 err = -EPERM;
 559                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 560                         break;
 561                 err = vlan_dev_change_flags(dev,
 562                                             args.vlan_qos ? args.u.flag : 0,
 563                                             args.u.flag);
 564                 break;
 565
 566         case SET_VLAN_NAME_TYPE_CMD:
 567                 err = -EPERM;
 568                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 569                         break;
 570                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 571                         struct vlan_net *vn;
 572
 573                         vn = net_generic(net, vlan_net_id);
 574                         vn->name_type = args.u.name_type;
 575                         err = 0;
 576                 } else {
 577                         err = -EINVAL;
 578                 }
 579                 break;
 580
 581         case ADD_VLAN_CMD:
 582                 err = -EPERM;
 583                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 584                         break;
 585                 err = register_vlan_device(dev, args.u.VID);
 586                 break;
 587
 588         case DEL_VLAN_CMD:
 589                 err = -EPERM;
 590                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 591                         break;
 592                 unregister_vlan_dev(dev, NULL);
 593                 err = 0;
 594                 break;
 595
 596         case GET_VLAN_REALDEV_NAME_CMD:
 597                 err = 0;
 598                 vlan_dev_get_realdev_name(dev, args.u.device2);
 599                 if (copy_to_user(arg, &args,
 600                                  sizeof(struct vlan_ioctl_args)))
 601                         err = -EFAULT;
 602                 break;
 603
 604         case GET_VLAN_VID_CMD:
 605                 err = 0;
 606                 args.u.VID = vlan_dev_vlan_id(dev);
 607                 if (copy_to_user(arg, &args,
 608                                  sizeof(struct vlan_ioctl_args)))
 609                       err = -EFAULT;
 610                 break;
 611
 612         default:
 613                 err = -EOPNOTSUPP;
 614                 break;
 615         }
 616 out:
 617         rtnl_unlock();
 618         return err;
 619 }
 620
 621 static struct sk_buff **vlan_gro_receive(struct sk_buff **head,
 622                                          struct sk_buff *skb)
 623 {
 624         struct sk_buff *p, **pp = NULL;
 625         struct vlan_hdr *vhdr;
 626         unsigned int hlen, off_vlan;
 627         const struct packet_offload *ptype;
 628         __be16 type;
 629         int flush = 1;
 630
 631         off_vlan = skb_gro_offset(skb);
 632         hlen = off_vlan + sizeof(*vhdr);
 633         vhdr = skb_gro_header_fast(skb, off_vlan);
 634         if (skb_gro_header_hard(skb, hlen)) {
 635                 vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
 636                 if (unlikely(!vhdr))
 637                         goto out;
 638         }
 639
 640         type = vhdr->h_vlan_encapsulated_proto;
 641
 642         rcu_read_lock();
 643         ptype = gro_find_receive_by_type(type);
 644         if (!ptype)
 645                 goto out_unlock;
 646
 647         flush = 0;
 648
 649         for (p = *head; p; p = p->next) {
 650                 struct vlan_hdr *vhdr2;
 651
 652                 if (!NAPI_GRO_CB(p)->same_flow)
 653                         continue;
 654
 655                 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
 656                 if (compare_vlan_header(vhdr, vhdr2))
 657                         NAPI_GRO_CB(p)->same_flow = 0;
 658         }
 659
 660         skb_gro_pull(skb, sizeof(*vhdr));
 661         skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
 662         pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
 663
 664 out_unlock:
 665         rcu_read_unlock();
 666 out:
 667         skb_gro_flush_final(skb, pp, flush);
 668
 669         return pp;
 670 }
 671
 672 static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
 673 {
 674         struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
 675         __be16 type = vhdr->h_vlan_encapsulated_proto;
 676         struct packet_offload *ptype;
 677         int err = -ENOENT;
 678
 679         rcu_read_lock();
 680         ptype = gro_find_complete_by_type(type);
 681         if (ptype)
 682                 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
 683
 684         rcu_read_unlock();
 685         return err;
 686 }
 687
 688 static struct packet_offload vlan_packet_offloads[] __read_mostly = {
 689         {
 690                 .type = cpu_to_be16(ETH_P_8021Q),
 691                 .priority = 10,
 692                 .callbacks = {
 693                         .gro_receive = vlan_gro_receive,
 694                         .gro_complete = vlan_gro_complete,
 695                 },
 696         },
 697         {
 698                 .type = cpu_to_be16(ETH_P_8021AD),
 699                 .priority = 10,
 700                 .callbacks = {
 701                         .gro_receive = vlan_gro_receive,
 702                         .gro_complete = vlan_gro_complete,
 703                 },
 704         },
 705 };
 706
 707 static int __net_init vlan_init_net(struct net *net)
 708 {
 709         struct vlan_net *vn = net_generic(net, vlan_net_id);
 710         int err;
 711
 712         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 713
 714         err = vlan_proc_init(net);
 715
 716         return err;
 717 }
 718
 719 static void __net_exit vlan_exit_net(struct net *net)
 720 {
 721         vlan_proc_cleanup(net);
 722 }
 723
 724 static struct pernet_operations vlan_net_ops = {
 725         .init = vlan_init_net,
 726         .exit = vlan_exit_net,
 727         .id   = &vlan_net_id,
 728         .size = sizeof(struct vlan_net),
 729 };
 730
 731 static int __init vlan_proto_init(void)
 732 {
 733         int err;
 734         unsigned int i;
 735
 736         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 737
 738         err = register_pernet_subsys(&vlan_net_ops);
 739         if (err < 0)
 740                 goto err0;
 741
 742         err = register_netdevice_notifier(&vlan_notifier_block);
 743         if (err < 0)
 744                 goto err2;
 745
 746         err = vlan_gvrp_init();
 747         if (err < 0)
 748                 goto err3;
 749
 750         err = vlan_mvrp_init();
 751         if (err < 0)
 752                 goto err4;
 753
 754         err = vlan_netlink_init();
 755         if (err < 0)
 756                 goto err5;
 757
 758         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 759                 dev_add_offload(&vlan_packet_offloads[i]);
 760
 761         vlan_ioctl_set(vlan_ioctl_handler);
 762         return 0;
 763
 764 err5:
 765         vlan_mvrp_uninit();
 766 err4:
 767         vlan_gvrp_uninit();
 768 err3:
 769         unregister_netdevice_notifier(&vlan_notifier_block);
 770 err2:
 771         unregister_pernet_subsys(&vlan_net_ops);
 772 err0:
 773         return err;
 774 }
 775
 776 static void __exit vlan_cleanup_module(void)
 777 {
 778         unsigned int i;
 779
 780         vlan_ioctl_set(NULL);
 781
 782         for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
 783                 dev_remove_offload(&vlan_packet_offloads[i]);
 784
 785         vlan_netlink_fini();
 786
 787         unregister_netdevice_notifier(&vlan_notifier_block);
 788
 789         unregister_pernet_subsys(&vlan_net_ops);
 790         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 791
 792         vlan_mvrp_uninit();
 793         vlan_gvrp_uninit();
 794 }
 795
 796 module_init(vlan_proto_init);
 797 module_exit(vlan_cleanup_module);
 798
 799 MODULE_LICENSE("GPL");
 800 MODULE_VERSION(DRV_VERSION);