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/init.h> 26 #include <linux/rculist.h> 27 #include <net/p8022.h> 28 #include <net/arp.h> 29 #include <linux/rtnetlink.h> 30 #include <linux/notifier.h> 31 #include <net/rtnetlink.h> 32 #include <net/net_namespace.h> 33 #include <net/netns/generic.h> 34 #include <asm/uaccess.h> 35 36 #include <linux/if_vlan.h> 37 #include "vlan.h" 38 #include "vlanproc.h" 39 40 #define DRV_VERSION "1.8" 41 42 /* Global VLAN variables */ 43 44 int vlan_net_id; 45 46 /* Our listing of VLAN group(s) */ 47 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE]; 48 49 static char vlan_fullname[] = "802.1Q VLAN Support"; 50 static char vlan_version[] = DRV_VERSION; 51 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>"; 52 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>"; 53 54 static struct packet_type vlan_packet_type = { 55 .type = __constant_htons(ETH_P_8021Q), 56 .func = vlan_skb_recv, /* VLAN receive method */ 57 }; 58 59 /* End of global variables definitions. */ 60 61 static inline unsigned int vlan_grp_hashfn(unsigned int idx) 62 { 63 return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK; 64 } 65 66 /* Must be invoked with RCU read lock (no preempt) */ 67 static struct vlan_group *__vlan_find_group(struct net_device *real_dev) 68 { 69 struct vlan_group *grp; 70 struct hlist_node *n; 71 int hash = vlan_grp_hashfn(real_dev->ifindex); 72 73 hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) { 74 if (grp->real_dev == real_dev) 75 return grp; 76 } 77 78 return NULL; 79 } 80 81 /* Find the protocol handler. Assumes VID < VLAN_VID_MASK. 82 * 83 * Must be invoked with RCU read lock (no preempt) 84 */ 85 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id) 86 { 87 struct vlan_group *grp = __vlan_find_group(real_dev); 88 89 if (grp) 90 return vlan_group_get_device(grp, vlan_id); 91 92 return NULL; 93 } 94 95 static void vlan_group_free(struct vlan_group *grp) 96 { 97 int i; 98 99 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) 100 kfree(grp->vlan_devices_arrays[i]); 101 kfree(grp); 102 } 103 104 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev) 105 { 106 struct vlan_group *grp; 107 108 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL); 109 if (!grp) 110 return NULL; 111 112 grp->real_dev = real_dev; 113 hlist_add_head_rcu(&grp->hlist, 114 &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]); 115 return grp; 116 } 117 118 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id) 119 { 120 struct net_device **array; 121 unsigned int size; 122 123 ASSERT_RTNL(); 124 125 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 126 if (array != NULL) 127 return 0; 128 129 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN; 130 array = kzalloc(size, GFP_KERNEL); 131 if (array == NULL) 132 return -ENOBUFS; 133 134 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array; 135 return 0; 136 } 137 138 static void vlan_rcu_free(struct rcu_head *rcu) 139 { 140 vlan_group_free(container_of(rcu, struct vlan_group, rcu)); 141 } 142 143 void unregister_vlan_dev(struct net_device *dev) 144 { 145 struct vlan_dev_info *vlan = vlan_dev_info(dev); 146 struct net_device *real_dev = vlan->real_dev; 147 struct vlan_group *grp; 148 u16 vlan_id = vlan->vlan_id; 149 150 ASSERT_RTNL(); 151 152 grp = __vlan_find_group(real_dev); 153 BUG_ON(!grp); 154 155 /* Take it out of our own structures, but be sure to interlock with 156 * HW accelerating devices or SW vlan input packet processing. 157 */ 158 if (real_dev->features & NETIF_F_HW_VLAN_FILTER) 159 real_dev->vlan_rx_kill_vid(real_dev, vlan_id); 160 161 vlan_group_set_device(grp, vlan_id, NULL); 162 grp->nr_vlans--; 163 164 synchronize_net(); 165 166 unregister_netdevice(dev); 167 168 /* If the group is now empty, kill off the group. */ 169 if (grp->nr_vlans == 0) { 170 vlan_gvrp_uninit_applicant(real_dev); 171 172 if (real_dev->features & NETIF_F_HW_VLAN_RX) 173 real_dev->vlan_rx_register(real_dev, NULL); 174 175 hlist_del_rcu(&grp->hlist); 176 177 /* Free the group, after all cpu's are done. */ 178 call_rcu(&grp->rcu, vlan_rcu_free); 179 } 180 181 /* Get rid of the vlan's reference to real_dev */ 182 dev_put(real_dev); 183 } 184 185 static void vlan_transfer_operstate(const struct net_device *dev, 186 struct net_device *vlandev) 187 { 188 /* Have to respect userspace enforced dormant state 189 * of real device, also must allow supplicant running 190 * on VLAN device 191 */ 192 if (dev->operstate == IF_OPER_DORMANT) 193 netif_dormant_on(vlandev); 194 else 195 netif_dormant_off(vlandev); 196 197 if (netif_carrier_ok(dev)) { 198 if (!netif_carrier_ok(vlandev)) 199 netif_carrier_on(vlandev); 200 } else { 201 if (netif_carrier_ok(vlandev)) 202 netif_carrier_off(vlandev); 203 } 204 } 205 206 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id) 207 { 208 char *name = real_dev->name; 209 210 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { 211 pr_info("8021q: VLANs not supported on %s\n", name); 212 return -EOPNOTSUPP; 213 } 214 215 if ((real_dev->features & NETIF_F_HW_VLAN_RX) && 216 !real_dev->vlan_rx_register) { 217 pr_info("8021q: device %s has buggy VLAN hw accel\n", name); 218 return -EOPNOTSUPP; 219 } 220 221 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && 222 (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) { 223 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); 224 return -EOPNOTSUPP; 225 } 226 227 /* The real device must be up and operating in order to 228 * assosciate a VLAN device with it. 229 */ 230 if (!(real_dev->flags & IFF_UP)) 231 return -ENETDOWN; 232 233 if (__find_vlan_dev(real_dev, vlan_id) != NULL) 234 return -EEXIST; 235 236 return 0; 237 } 238 239 int register_vlan_dev(struct net_device *dev) 240 { 241 struct vlan_dev_info *vlan = vlan_dev_info(dev); 242 struct net_device *real_dev = vlan->real_dev; 243 u16 vlan_id = vlan->vlan_id; 244 struct vlan_group *grp, *ngrp = NULL; 245 int err; 246 247 grp = __vlan_find_group(real_dev); 248 if (!grp) { 249 ngrp = grp = vlan_group_alloc(real_dev); 250 if (!grp) 251 return -ENOBUFS; 252 err = vlan_gvrp_init_applicant(real_dev); 253 if (err < 0) 254 goto out_free_group; 255 } 256 257 err = vlan_group_prealloc_vid(grp, vlan_id); 258 if (err < 0) 259 goto out_uninit_applicant; 260 261 err = register_netdevice(dev); 262 if (err < 0) 263 goto out_uninit_applicant; 264 265 /* Account for reference in struct vlan_dev_info */ 266 dev_hold(real_dev); 267 268 vlan_transfer_operstate(real_dev, dev); 269 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ 270 271 /* So, got the sucker initialized, now lets place 272 * it into our local structure. 273 */ 274 vlan_group_set_device(grp, vlan_id, dev); 275 grp->nr_vlans++; 276 277 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX) 278 real_dev->vlan_rx_register(real_dev, ngrp); 279 if (real_dev->features & NETIF_F_HW_VLAN_FILTER) 280 real_dev->vlan_rx_add_vid(real_dev, vlan_id); 281 282 return 0; 283 284 out_uninit_applicant: 285 if (ngrp) 286 vlan_gvrp_uninit_applicant(real_dev); 287 out_free_group: 288 if (ngrp) 289 vlan_group_free(ngrp); 290 return err; 291 } 292 293 /* Attach a VLAN device to a mac address (ie Ethernet Card). 294 * Returns 0 if the device was created or a negative error code otherwise. 295 */ 296 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 297 { 298 struct net_device *new_dev; 299 struct net *net = dev_net(real_dev); 300 struct vlan_net *vn = net_generic(net, vlan_net_id); 301 char name[IFNAMSIZ]; 302 int err; 303 304 if (vlan_id >= VLAN_VID_MASK) 305 return -ERANGE; 306 307 err = vlan_check_real_dev(real_dev, vlan_id); 308 if (err < 0) 309 return err; 310 311 /* Gotta set up the fields for the device. */ 312 switch (vn->name_type) { 313 case VLAN_NAME_TYPE_RAW_PLUS_VID: 314 /* name will look like: eth1.0005 */ 315 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 316 break; 317 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 318 /* Put our vlan.VID in the name. 319 * Name will look like: vlan5 320 */ 321 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 322 break; 323 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 324 /* Put our vlan.VID in the name. 325 * Name will look like: eth0.5 326 */ 327 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 328 break; 329 case VLAN_NAME_TYPE_PLUS_VID: 330 /* Put our vlan.VID in the name. 331 * Name will look like: vlan0005 332 */ 333 default: 334 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 335 } 336 337 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, 338 vlan_setup); 339 340 if (new_dev == NULL) 341 return -ENOBUFS; 342 343 dev_net_set(new_dev, net); 344 /* need 4 bytes for extra VLAN header info, 345 * hope the underlying device can handle it. 346 */ 347 new_dev->mtu = real_dev->mtu; 348 349 vlan_dev_info(new_dev)->vlan_id = vlan_id; 350 vlan_dev_info(new_dev)->real_dev = real_dev; 351 vlan_dev_info(new_dev)->dent = NULL; 352 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR; 353 354 new_dev->rtnl_link_ops = &vlan_link_ops; 355 err = register_vlan_dev(new_dev); 356 if (err < 0) 357 goto out_free_newdev; 358 359 return 0; 360 361 out_free_newdev: 362 free_netdev(new_dev); 363 return err; 364 } 365 366 static void vlan_sync_address(struct net_device *dev, 367 struct net_device *vlandev) 368 { 369 struct vlan_dev_info *vlan = vlan_dev_info(vlandev); 370 371 /* May be called without an actual change */ 372 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) 373 return; 374 375 /* vlan address was different from the old address and is equal to 376 * the new address */ 377 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 378 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 379 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN); 380 381 /* vlan address was equal to the old address and is different from 382 * the new address */ 383 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 384 compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 385 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN); 386 387 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); 388 } 389 390 static void vlan_transfer_features(struct net_device *dev, 391 struct net_device *vlandev) 392 { 393 unsigned long old_features = vlandev->features; 394 395 vlandev->features &= ~dev->vlan_features; 396 vlandev->features |= dev->features & dev->vlan_features; 397 398 if (old_features != vlandev->features) 399 netdev_features_change(vlandev); 400 } 401 402 static void __vlan_device_event(struct net_device *dev, unsigned long event) 403 { 404 switch (event) { 405 case NETDEV_CHANGENAME: 406 vlan_proc_rem_dev(dev); 407 if (vlan_proc_add_dev(dev) < 0) 408 pr_warning("8021q: failed to change proc name for %s\n", 409 dev->name); 410 break; 411 case NETDEV_REGISTER: 412 if (vlan_proc_add_dev(dev) < 0) 413 pr_warning("8021q: failed to add proc entry for %s\n", 414 dev->name); 415 break; 416 case NETDEV_UNREGISTER: 417 vlan_proc_rem_dev(dev); 418 break; 419 } 420 } 421 422 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 423 void *ptr) 424 { 425 struct net_device *dev = ptr; 426 struct vlan_group *grp; 427 int i, flgs; 428 struct net_device *vlandev; 429 430 if (is_vlan_dev(dev)) 431 __vlan_device_event(dev, event); 432 433 grp = __vlan_find_group(dev); 434 if (!grp) 435 goto out; 436 437 /* It is OK that we do not hold the group lock right now, 438 * as we run under the RTNL lock. 439 */ 440 441 switch (event) { 442 case NETDEV_CHANGE: 443 /* Propagate real device state to vlan devices */ 444 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 445 vlandev = vlan_group_get_device(grp, i); 446 if (!vlandev) 447 continue; 448 449 vlan_transfer_operstate(dev, vlandev); 450 } 451 break; 452 453 case NETDEV_CHANGEADDR: 454 /* Adjust unicast filters on underlying device */ 455 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 456 vlandev = vlan_group_get_device(grp, i); 457 if (!vlandev) 458 continue; 459 460 flgs = vlandev->flags; 461 if (!(flgs & IFF_UP)) 462 continue; 463 464 vlan_sync_address(dev, vlandev); 465 } 466 break; 467 468 case NETDEV_FEAT_CHANGE: 469 /* Propagate device features to underlying device */ 470 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 471 vlandev = vlan_group_get_device(grp, i); 472 if (!vlandev) 473 continue; 474 475 vlan_transfer_features(dev, vlandev); 476 } 477 478 break; 479 480 case NETDEV_DOWN: 481 /* Put all VLANs for this dev in the down state too. */ 482 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 483 vlandev = vlan_group_get_device(grp, i); 484 if (!vlandev) 485 continue; 486 487 flgs = vlandev->flags; 488 if (!(flgs & IFF_UP)) 489 continue; 490 491 dev_change_flags(vlandev, flgs & ~IFF_UP); 492 } 493 break; 494 495 case NETDEV_UP: 496 /* Put all VLANs for this dev in the up state too. */ 497 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 498 vlandev = vlan_group_get_device(grp, i); 499 if (!vlandev) 500 continue; 501 502 flgs = vlandev->flags; 503 if (flgs & IFF_UP) 504 continue; 505 506 dev_change_flags(vlandev, flgs | IFF_UP); 507 } 508 break; 509 510 case NETDEV_UNREGISTER: 511 /* Delete all VLANs for this dev. */ 512 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 513 vlandev = vlan_group_get_device(grp, i); 514 if (!vlandev) 515 continue; 516 517 /* unregistration of last vlan destroys group, abort 518 * afterwards */ 519 if (grp->nr_vlans == 1) 520 i = VLAN_GROUP_ARRAY_LEN; 521 522 unregister_vlan_dev(vlandev); 523 } 524 break; 525 } 526 527 out: 528 return NOTIFY_DONE; 529 } 530 531 static struct notifier_block vlan_notifier_block __read_mostly = { 532 .notifier_call = vlan_device_event, 533 }; 534 535 /* 536 * VLAN IOCTL handler. 537 * o execute requested action or pass command to the device driver 538 * arg is really a struct vlan_ioctl_args __user *. 539 */ 540 static int vlan_ioctl_handler(struct net *net, void __user *arg) 541 { 542 int err; 543 struct vlan_ioctl_args args; 544 struct net_device *dev = NULL; 545 546 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 547 return -EFAULT; 548 549 /* Null terminate this sucker, just in case. */ 550 args.device1[23] = 0; 551 args.u.device2[23] = 0; 552 553 rtnl_lock(); 554 555 switch (args.cmd) { 556 case SET_VLAN_INGRESS_PRIORITY_CMD: 557 case SET_VLAN_EGRESS_PRIORITY_CMD: 558 case SET_VLAN_FLAG_CMD: 559 case ADD_VLAN_CMD: 560 case DEL_VLAN_CMD: 561 case GET_VLAN_REALDEV_NAME_CMD: 562 case GET_VLAN_VID_CMD: 563 err = -ENODEV; 564 dev = __dev_get_by_name(net, args.device1); 565 if (!dev) 566 goto out; 567 568 err = -EINVAL; 569 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 570 goto out; 571 } 572 573 switch (args.cmd) { 574 case SET_VLAN_INGRESS_PRIORITY_CMD: 575 err = -EPERM; 576 if (!capable(CAP_NET_ADMIN)) 577 break; 578 vlan_dev_set_ingress_priority(dev, 579 args.u.skb_priority, 580 args.vlan_qos); 581 err = 0; 582 break; 583 584 case SET_VLAN_EGRESS_PRIORITY_CMD: 585 err = -EPERM; 586 if (!capable(CAP_NET_ADMIN)) 587 break; 588 err = vlan_dev_set_egress_priority(dev, 589 args.u.skb_priority, 590 args.vlan_qos); 591 break; 592 593 case SET_VLAN_FLAG_CMD: 594 err = -EPERM; 595 if (!capable(CAP_NET_ADMIN)) 596 break; 597 err = vlan_dev_change_flags(dev, 598 args.vlan_qos ? args.u.flag : 0, 599 args.u.flag); 600 break; 601 602 case SET_VLAN_NAME_TYPE_CMD: 603 err = -EPERM; 604 if (!capable(CAP_NET_ADMIN)) 605 break; 606 if ((args.u.name_type >= 0) && 607 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 608 struct vlan_net *vn; 609 610 vn = net_generic(net, vlan_net_id); 611 vn->name_type = args.u.name_type; 612 err = 0; 613 } else { 614 err = -EINVAL; 615 } 616 break; 617 618 case ADD_VLAN_CMD: 619 err = -EPERM; 620 if (!capable(CAP_NET_ADMIN)) 621 break; 622 err = register_vlan_device(dev, args.u.VID); 623 break; 624 625 case DEL_VLAN_CMD: 626 err = -EPERM; 627 if (!capable(CAP_NET_ADMIN)) 628 break; 629 unregister_vlan_dev(dev); 630 err = 0; 631 break; 632 633 case GET_VLAN_REALDEV_NAME_CMD: 634 err = 0; 635 vlan_dev_get_realdev_name(dev, args.u.device2); 636 if (copy_to_user(arg, &args, 637 sizeof(struct vlan_ioctl_args))) 638 err = -EFAULT; 639 break; 640 641 case GET_VLAN_VID_CMD: 642 err = 0; 643 args.u.VID = vlan_dev_vlan_id(dev); 644 if (copy_to_user(arg, &args, 645 sizeof(struct vlan_ioctl_args))) 646 err = -EFAULT; 647 break; 648 649 default: 650 err = -EOPNOTSUPP; 651 break; 652 } 653 out: 654 rtnl_unlock(); 655 return err; 656 } 657 658 static int vlan_init_net(struct net *net) 659 { 660 int err; 661 struct vlan_net *vn; 662 663 err = -ENOMEM; 664 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL); 665 if (vn == NULL) 666 goto err_alloc; 667 668 err = net_assign_generic(net, vlan_net_id, vn); 669 if (err < 0) 670 goto err_assign; 671 672 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 673 674 err = vlan_proc_init(net); 675 if (err < 0) 676 goto err_proc; 677 678 return 0; 679 680 err_proc: 681 /* nothing */ 682 err_assign: 683 kfree(vn); 684 err_alloc: 685 return err; 686 } 687 688 static void vlan_exit_net(struct net *net) 689 { 690 struct vlan_net *vn; 691 692 vn = net_generic(net, vlan_net_id); 693 rtnl_kill_links(net, &vlan_link_ops); 694 vlan_proc_cleanup(net); 695 kfree(vn); 696 } 697 698 static struct pernet_operations vlan_net_ops = { 699 .init = vlan_init_net, 700 .exit = vlan_exit_net, 701 }; 702 703 static int __init vlan_proto_init(void) 704 { 705 int err; 706 707 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); 708 pr_info("All bugs added by %s\n", vlan_buggyright); 709 710 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops); 711 if (err < 0) 712 goto err0; 713 714 err = register_netdevice_notifier(&vlan_notifier_block); 715 if (err < 0) 716 goto err2; 717 718 err = vlan_gvrp_init(); 719 if (err < 0) 720 goto err3; 721 722 err = vlan_netlink_init(); 723 if (err < 0) 724 goto err4; 725 726 dev_add_pack(&vlan_packet_type); 727 vlan_ioctl_set(vlan_ioctl_handler); 728 return 0; 729 730 err4: 731 vlan_gvrp_uninit(); 732 err3: 733 unregister_netdevice_notifier(&vlan_notifier_block); 734 err2: 735 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 736 err0: 737 return err; 738 } 739 740 static void __exit vlan_cleanup_module(void) 741 { 742 unsigned int i; 743 744 vlan_ioctl_set(NULL); 745 vlan_netlink_fini(); 746 747 unregister_netdevice_notifier(&vlan_notifier_block); 748 749 dev_remove_pack(&vlan_packet_type); 750 751 /* This table must be empty if there are no module references left. */ 752 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) 753 BUG_ON(!hlist_empty(&vlan_group_hash[i])); 754 755 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 756 synchronize_net(); 757 758 vlan_gvrp_uninit(); 759 } 760 761 module_init(vlan_proto_init); 762 module_exit(vlan_cleanup_module); 763 764 MODULE_LICENSE("GPL"); 765 MODULE_VERSION(DRV_VERSION); 766