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 #include <linux/capability.h> 22 #include <linux/module.h> 23 #include <linux/netdevice.h> 24 #include <linux/skbuff.h> 25 #include <linux/slab.h> 26 #include <linux/init.h> 27 #include <linux/rculist.h> 28 #include <net/p8022.h> 29 #include <net/arp.h> 30 #include <linux/rtnetlink.h> 31 #include <linux/notifier.h> 32 #include <net/rtnetlink.h> 33 #include <net/net_namespace.h> 34 #include <net/netns/generic.h> 35 #include <asm/uaccess.h> 36 37 #include <linux/if_vlan.h> 38 #include "vlan.h" 39 #include "vlanproc.h" 40 41 #define DRV_VERSION "1.8" 42 43 /* Global VLAN variables */ 44 45 int vlan_net_id __read_mostly; 46 47 const char vlan_fullname[] = "802.1Q VLAN Support"; 48 const char vlan_version[] = DRV_VERSION; 49 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>"; 50 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>"; 51 52 static struct packet_type vlan_packet_type __read_mostly = { 53 .type = cpu_to_be16(ETH_P_8021Q), 54 .func = vlan_skb_recv, /* VLAN receive method */ 55 }; 56 57 /* End of global variables definitions. */ 58 59 static void vlan_group_free(struct vlan_group *grp) 60 { 61 int i; 62 63 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) 64 kfree(grp->vlan_devices_arrays[i]); 65 kfree(grp); 66 } 67 68 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev) 69 { 70 struct vlan_group *grp; 71 72 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL); 73 if (!grp) 74 return NULL; 75 76 grp->real_dev = real_dev; 77 return grp; 78 } 79 80 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id) 81 { 82 struct net_device **array; 83 unsigned int size; 84 85 ASSERT_RTNL(); 86 87 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 88 if (array != NULL) 89 return 0; 90 91 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN; 92 array = kzalloc(size, GFP_KERNEL); 93 if (array == NULL) 94 return -ENOBUFS; 95 96 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array; 97 return 0; 98 } 99 100 static void vlan_rcu_free(struct rcu_head *rcu) 101 { 102 vlan_group_free(container_of(rcu, struct vlan_group, rcu)); 103 } 104 105 void unregister_vlan_dev(struct net_device *dev, struct list_head *head) 106 { 107 struct vlan_dev_info *vlan = vlan_dev_info(dev); 108 struct net_device *real_dev = vlan->real_dev; 109 const struct net_device_ops *ops = real_dev->netdev_ops; 110 struct vlan_group *grp; 111 u16 vlan_id = vlan->vlan_id; 112 113 ASSERT_RTNL(); 114 115 grp = rtnl_dereference(real_dev->vlgrp); 116 BUG_ON(!grp); 117 118 /* Take it out of our own structures, but be sure to interlock with 119 * HW accelerating devices or SW vlan input packet processing if 120 * VLAN is not 0 (leave it there for 802.1p). 121 */ 122 if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER)) 123 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id); 124 125 grp->nr_vlans--; 126 127 vlan_group_set_device(grp, vlan_id, NULL); 128 if (!grp->killall) 129 synchronize_net(); 130 131 unregister_netdevice_queue(dev, head); 132 133 /* If the group is now empty, kill off the group. */ 134 if (grp->nr_vlans == 0) { 135 vlan_gvrp_uninit_applicant(real_dev); 136 137 rcu_assign_pointer(real_dev->vlgrp, NULL); 138 if (ops->ndo_vlan_rx_register) 139 ops->ndo_vlan_rx_register(real_dev, NULL); 140 141 /* Free the group, after all cpu's are done. */ 142 call_rcu(&grp->rcu, vlan_rcu_free); 143 } 144 145 /* Get rid of the vlan's reference to real_dev */ 146 dev_put(real_dev); 147 } 148 149 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id) 150 { 151 const char *name = real_dev->name; 152 const struct net_device_ops *ops = real_dev->netdev_ops; 153 154 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { 155 pr_info("8021q: VLANs not supported on %s\n", name); 156 return -EOPNOTSUPP; 157 } 158 159 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && 160 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) { 161 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); 162 return -EOPNOTSUPP; 163 } 164 165 if (vlan_find_dev(real_dev, vlan_id) != NULL) 166 return -EEXIST; 167 168 return 0; 169 } 170 171 int register_vlan_dev(struct net_device *dev) 172 { 173 struct vlan_dev_info *vlan = vlan_dev_info(dev); 174 struct net_device *real_dev = vlan->real_dev; 175 const struct net_device_ops *ops = real_dev->netdev_ops; 176 u16 vlan_id = vlan->vlan_id; 177 struct vlan_group *grp, *ngrp = NULL; 178 int err; 179 180 grp = rtnl_dereference(real_dev->vlgrp); 181 if (!grp) { 182 ngrp = grp = vlan_group_alloc(real_dev); 183 if (!grp) 184 return -ENOBUFS; 185 err = vlan_gvrp_init_applicant(real_dev); 186 if (err < 0) 187 goto out_free_group; 188 } 189 190 err = vlan_group_prealloc_vid(grp, vlan_id); 191 if (err < 0) 192 goto out_uninit_applicant; 193 194 err = register_netdevice(dev); 195 if (err < 0) 196 goto out_uninit_applicant; 197 198 /* Account for reference in struct vlan_dev_info */ 199 dev_hold(real_dev); 200 201 netif_stacked_transfer_operstate(real_dev, dev); 202 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ 203 204 /* So, got the sucker initialized, now lets place 205 * it into our local structure. 206 */ 207 vlan_group_set_device(grp, vlan_id, dev); 208 grp->nr_vlans++; 209 210 if (ngrp) { 211 if (ops->ndo_vlan_rx_register) 212 ops->ndo_vlan_rx_register(real_dev, ngrp); 213 rcu_assign_pointer(real_dev->vlgrp, ngrp); 214 } 215 if (real_dev->features & NETIF_F_HW_VLAN_FILTER) 216 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id); 217 218 return 0; 219 220 out_uninit_applicant: 221 if (ngrp) 222 vlan_gvrp_uninit_applicant(real_dev); 223 out_free_group: 224 if (ngrp) { 225 /* Free the group, after all cpu's are done. */ 226 call_rcu(&ngrp->rcu, vlan_rcu_free); 227 } 228 return err; 229 } 230 231 /* Attach a VLAN device to a mac address (ie Ethernet Card). 232 * Returns 0 if the device was created or a negative error code otherwise. 233 */ 234 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 235 { 236 struct net_device *new_dev; 237 struct net *net = dev_net(real_dev); 238 struct vlan_net *vn = net_generic(net, vlan_net_id); 239 char name[IFNAMSIZ]; 240 int err; 241 242 if (vlan_id >= VLAN_VID_MASK) 243 return -ERANGE; 244 245 err = vlan_check_real_dev(real_dev, vlan_id); 246 if (err < 0) 247 return err; 248 249 /* Gotta set up the fields for the device. */ 250 switch (vn->name_type) { 251 case VLAN_NAME_TYPE_RAW_PLUS_VID: 252 /* name will look like: eth1.0005 */ 253 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 254 break; 255 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 256 /* Put our vlan.VID in the name. 257 * Name will look like: vlan5 258 */ 259 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 260 break; 261 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 262 /* Put our vlan.VID in the name. 263 * Name will look like: eth0.5 264 */ 265 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 266 break; 267 case VLAN_NAME_TYPE_PLUS_VID: 268 /* Put our vlan.VID in the name. 269 * Name will look like: vlan0005 270 */ 271 default: 272 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 273 } 274 275 new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name, 276 vlan_setup, real_dev->num_tx_queues); 277 278 if (new_dev == NULL) 279 return -ENOBUFS; 280 281 netif_copy_real_num_queues(new_dev, real_dev); 282 dev_net_set(new_dev, net); 283 /* need 4 bytes for extra VLAN header info, 284 * hope the underlying device can handle it. 285 */ 286 new_dev->mtu = real_dev->mtu; 287 288 vlan_dev_info(new_dev)->vlan_id = vlan_id; 289 vlan_dev_info(new_dev)->real_dev = real_dev; 290 vlan_dev_info(new_dev)->dent = NULL; 291 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR; 292 293 new_dev->rtnl_link_ops = &vlan_link_ops; 294 err = register_vlan_dev(new_dev); 295 if (err < 0) 296 goto out_free_newdev; 297 298 return 0; 299 300 out_free_newdev: 301 free_netdev(new_dev); 302 return err; 303 } 304 305 static void vlan_sync_address(struct net_device *dev, 306 struct net_device *vlandev) 307 { 308 struct vlan_dev_info *vlan = vlan_dev_info(vlandev); 309 310 /* May be called without an actual change */ 311 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) 312 return; 313 314 /* vlan address was different from the old address and is equal to 315 * the new address */ 316 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 317 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 318 dev_uc_del(dev, vlandev->dev_addr); 319 320 /* vlan address was equal to the old address and is different from 321 * the new address */ 322 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 323 compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 324 dev_uc_add(dev, vlandev->dev_addr); 325 326 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); 327 } 328 329 static void vlan_transfer_features(struct net_device *dev, 330 struct net_device *vlandev) 331 { 332 unsigned long old_features = vlandev->features; 333 334 vlandev->features &= ~dev->vlan_features; 335 vlandev->features |= dev->features & dev->vlan_features; 336 vlandev->gso_max_size = dev->gso_max_size; 337 338 if (dev->features & NETIF_F_HW_VLAN_TX) 339 vlandev->hard_header_len = dev->hard_header_len; 340 else 341 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 342 343 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 344 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 345 #endif 346 vlandev->real_num_tx_queues = dev->real_num_tx_queues; 347 BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues); 348 349 if (old_features != vlandev->features) 350 netdev_features_change(vlandev); 351 } 352 353 static void __vlan_device_event(struct net_device *dev, unsigned long event) 354 { 355 switch (event) { 356 case NETDEV_CHANGENAME: 357 vlan_proc_rem_dev(dev); 358 if (vlan_proc_add_dev(dev) < 0) 359 pr_warning("8021q: failed to change proc name for %s\n", 360 dev->name); 361 break; 362 case NETDEV_REGISTER: 363 if (vlan_proc_add_dev(dev) < 0) 364 pr_warning("8021q: failed to add proc entry for %s\n", 365 dev->name); 366 break; 367 case NETDEV_UNREGISTER: 368 vlan_proc_rem_dev(dev); 369 break; 370 } 371 } 372 373 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 374 void *ptr) 375 { 376 struct net_device *dev = ptr; 377 struct vlan_group *grp; 378 int i, flgs; 379 struct net_device *vlandev; 380 struct vlan_dev_info *vlan; 381 LIST_HEAD(list); 382 383 if (is_vlan_dev(dev)) 384 __vlan_device_event(dev, event); 385 386 if ((event == NETDEV_UP) && 387 (dev->features & NETIF_F_HW_VLAN_FILTER) && 388 dev->netdev_ops->ndo_vlan_rx_add_vid) { 389 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n", 390 dev->name); 391 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0); 392 } 393 394 grp = rtnl_dereference(dev->vlgrp); 395 if (!grp) 396 goto out; 397 398 /* It is OK that we do not hold the group lock right now, 399 * as we run under the RTNL lock. 400 */ 401 402 switch (event) { 403 case NETDEV_CHANGE: 404 /* Propagate real device state to vlan devices */ 405 for (i = 0; i < VLAN_N_VID; i++) { 406 vlandev = vlan_group_get_device(grp, i); 407 if (!vlandev) 408 continue; 409 410 netif_stacked_transfer_operstate(dev, vlandev); 411 } 412 break; 413 414 case NETDEV_CHANGEADDR: 415 /* Adjust unicast filters on underlying device */ 416 for (i = 0; i < VLAN_N_VID; i++) { 417 vlandev = vlan_group_get_device(grp, i); 418 if (!vlandev) 419 continue; 420 421 flgs = vlandev->flags; 422 if (!(flgs & IFF_UP)) 423 continue; 424 425 vlan_sync_address(dev, vlandev); 426 } 427 break; 428 429 case NETDEV_CHANGEMTU: 430 for (i = 0; i < VLAN_N_VID; i++) { 431 vlandev = vlan_group_get_device(grp, i); 432 if (!vlandev) 433 continue; 434 435 if (vlandev->mtu <= dev->mtu) 436 continue; 437 438 dev_set_mtu(vlandev, dev->mtu); 439 } 440 break; 441 442 case NETDEV_FEAT_CHANGE: 443 /* Propagate device features to underlying device */ 444 for (i = 0; i < VLAN_N_VID; i++) { 445 vlandev = vlan_group_get_device(grp, i); 446 if (!vlandev) 447 continue; 448 449 vlan_transfer_features(dev, vlandev); 450 } 451 452 break; 453 454 case NETDEV_DOWN: 455 /* Put all VLANs for this dev in the down state too. */ 456 for (i = 0; i < VLAN_N_VID; i++) { 457 vlandev = vlan_group_get_device(grp, i); 458 if (!vlandev) 459 continue; 460 461 flgs = vlandev->flags; 462 if (!(flgs & IFF_UP)) 463 continue; 464 465 vlan = vlan_dev_info(vlandev); 466 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 467 dev_change_flags(vlandev, flgs & ~IFF_UP); 468 netif_stacked_transfer_operstate(dev, vlandev); 469 } 470 break; 471 472 case NETDEV_UP: 473 /* Put all VLANs for this dev in the up state too. */ 474 for (i = 0; i < VLAN_N_VID; i++) { 475 vlandev = vlan_group_get_device(grp, i); 476 if (!vlandev) 477 continue; 478 479 flgs = vlandev->flags; 480 if (flgs & IFF_UP) 481 continue; 482 483 vlan = vlan_dev_info(vlandev); 484 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 485 dev_change_flags(vlandev, flgs | IFF_UP); 486 netif_stacked_transfer_operstate(dev, vlandev); 487 } 488 break; 489 490 case NETDEV_UNREGISTER: 491 /* twiddle thumbs on netns device moves */ 492 if (dev->reg_state != NETREG_UNREGISTERING) 493 break; 494 495 /* Delete all VLANs for this dev. */ 496 grp->killall = 1; 497 498 for (i = 0; i < VLAN_N_VID; i++) { 499 vlandev = vlan_group_get_device(grp, i); 500 if (!vlandev) 501 continue; 502 503 /* unregistration of last vlan destroys group, abort 504 * afterwards */ 505 if (grp->nr_vlans == 1) 506 i = VLAN_N_VID; 507 508 unregister_vlan_dev(vlandev, &list); 509 } 510 unregister_netdevice_many(&list); 511 break; 512 513 case NETDEV_PRE_TYPE_CHANGE: 514 /* Forbid underlaying device to change its type. */ 515 return NOTIFY_BAD; 516 } 517 518 out: 519 return NOTIFY_DONE; 520 } 521 522 static struct notifier_block vlan_notifier_block __read_mostly = { 523 .notifier_call = vlan_device_event, 524 }; 525 526 /* 527 * VLAN IOCTL handler. 528 * o execute requested action or pass command to the device driver 529 * arg is really a struct vlan_ioctl_args __user *. 530 */ 531 static int vlan_ioctl_handler(struct net *net, void __user *arg) 532 { 533 int err; 534 struct vlan_ioctl_args args; 535 struct net_device *dev = NULL; 536 537 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 538 return -EFAULT; 539 540 /* Null terminate this sucker, just in case. */ 541 args.device1[23] = 0; 542 args.u.device2[23] = 0; 543 544 rtnl_lock(); 545 546 switch (args.cmd) { 547 case SET_VLAN_INGRESS_PRIORITY_CMD: 548 case SET_VLAN_EGRESS_PRIORITY_CMD: 549 case SET_VLAN_FLAG_CMD: 550 case ADD_VLAN_CMD: 551 case DEL_VLAN_CMD: 552 case GET_VLAN_REALDEV_NAME_CMD: 553 case GET_VLAN_VID_CMD: 554 err = -ENODEV; 555 dev = __dev_get_by_name(net, args.device1); 556 if (!dev) 557 goto out; 558 559 err = -EINVAL; 560 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 561 goto out; 562 } 563 564 switch (args.cmd) { 565 case SET_VLAN_INGRESS_PRIORITY_CMD: 566 err = -EPERM; 567 if (!capable(CAP_NET_ADMIN)) 568 break; 569 vlan_dev_set_ingress_priority(dev, 570 args.u.skb_priority, 571 args.vlan_qos); 572 err = 0; 573 break; 574 575 case SET_VLAN_EGRESS_PRIORITY_CMD: 576 err = -EPERM; 577 if (!capable(CAP_NET_ADMIN)) 578 break; 579 err = vlan_dev_set_egress_priority(dev, 580 args.u.skb_priority, 581 args.vlan_qos); 582 break; 583 584 case SET_VLAN_FLAG_CMD: 585 err = -EPERM; 586 if (!capable(CAP_NET_ADMIN)) 587 break; 588 err = vlan_dev_change_flags(dev, 589 args.vlan_qos ? args.u.flag : 0, 590 args.u.flag); 591 break; 592 593 case SET_VLAN_NAME_TYPE_CMD: 594 err = -EPERM; 595 if (!capable(CAP_NET_ADMIN)) 596 break; 597 if ((args.u.name_type >= 0) && 598 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 599 struct vlan_net *vn; 600 601 vn = net_generic(net, vlan_net_id); 602 vn->name_type = args.u.name_type; 603 err = 0; 604 } else { 605 err = -EINVAL; 606 } 607 break; 608 609 case ADD_VLAN_CMD: 610 err = -EPERM; 611 if (!capable(CAP_NET_ADMIN)) 612 break; 613 err = register_vlan_device(dev, args.u.VID); 614 break; 615 616 case DEL_VLAN_CMD: 617 err = -EPERM; 618 if (!capable(CAP_NET_ADMIN)) 619 break; 620 unregister_vlan_dev(dev, NULL); 621 err = 0; 622 break; 623 624 case GET_VLAN_REALDEV_NAME_CMD: 625 err = 0; 626 vlan_dev_get_realdev_name(dev, args.u.device2); 627 if (copy_to_user(arg, &args, 628 sizeof(struct vlan_ioctl_args))) 629 err = -EFAULT; 630 break; 631 632 case GET_VLAN_VID_CMD: 633 err = 0; 634 args.u.VID = vlan_dev_vlan_id(dev); 635 if (copy_to_user(arg, &args, 636 sizeof(struct vlan_ioctl_args))) 637 err = -EFAULT; 638 break; 639 640 default: 641 err = -EOPNOTSUPP; 642 break; 643 } 644 out: 645 rtnl_unlock(); 646 return err; 647 } 648 649 static int __net_init vlan_init_net(struct net *net) 650 { 651 struct vlan_net *vn = net_generic(net, vlan_net_id); 652 int err; 653 654 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 655 656 err = vlan_proc_init(net); 657 658 return err; 659 } 660 661 static void __net_exit vlan_exit_net(struct net *net) 662 { 663 vlan_proc_cleanup(net); 664 } 665 666 static struct pernet_operations vlan_net_ops = { 667 .init = vlan_init_net, 668 .exit = vlan_exit_net, 669 .id = &vlan_net_id, 670 .size = sizeof(struct vlan_net), 671 }; 672 673 static int __init vlan_proto_init(void) 674 { 675 int err; 676 677 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); 678 pr_info("All bugs added by %s\n", vlan_buggyright); 679 680 err = register_pernet_subsys(&vlan_net_ops); 681 if (err < 0) 682 goto err0; 683 684 err = register_netdevice_notifier(&vlan_notifier_block); 685 if (err < 0) 686 goto err2; 687 688 err = vlan_gvrp_init(); 689 if (err < 0) 690 goto err3; 691 692 err = vlan_netlink_init(); 693 if (err < 0) 694 goto err4; 695 696 dev_add_pack(&vlan_packet_type); 697 vlan_ioctl_set(vlan_ioctl_handler); 698 return 0; 699 700 err4: 701 vlan_gvrp_uninit(); 702 err3: 703 unregister_netdevice_notifier(&vlan_notifier_block); 704 err2: 705 unregister_pernet_subsys(&vlan_net_ops); 706 err0: 707 return err; 708 } 709 710 static void __exit vlan_cleanup_module(void) 711 { 712 vlan_ioctl_set(NULL); 713 vlan_netlink_fini(); 714 715 unregister_netdevice_notifier(&vlan_notifier_block); 716 717 dev_remove_pack(&vlan_packet_type); 718 719 unregister_pernet_subsys(&vlan_net_ops); 720 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 721 722 vlan_gvrp_uninit(); 723 } 724 725 module_init(vlan_proto_init); 726 module_exit(vlan_cleanup_module); 727 728 MODULE_LICENSE("GPL"); 729 MODULE_VERSION(DRV_VERSION); 730