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 vlandev->gso_max_size = dev->gso_max_size; 398 399 if (old_features != vlandev->features) 400 netdev_features_change(vlandev); 401 } 402 403 static void __vlan_device_event(struct net_device *dev, unsigned long event) 404 { 405 switch (event) { 406 case NETDEV_CHANGENAME: 407 vlan_proc_rem_dev(dev); 408 if (vlan_proc_add_dev(dev) < 0) 409 pr_warning("8021q: failed to change proc name for %s\n", 410 dev->name); 411 break; 412 case NETDEV_REGISTER: 413 if (vlan_proc_add_dev(dev) < 0) 414 pr_warning("8021q: failed to add proc entry for %s\n", 415 dev->name); 416 break; 417 case NETDEV_UNREGISTER: 418 vlan_proc_rem_dev(dev); 419 break; 420 } 421 } 422 423 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 424 void *ptr) 425 { 426 struct net_device *dev = ptr; 427 struct vlan_group *grp; 428 int i, flgs; 429 struct net_device *vlandev; 430 431 if (is_vlan_dev(dev)) 432 __vlan_device_event(dev, event); 433 434 grp = __vlan_find_group(dev); 435 if (!grp) 436 goto out; 437 438 /* It is OK that we do not hold the group lock right now, 439 * as we run under the RTNL lock. 440 */ 441 442 switch (event) { 443 case NETDEV_CHANGE: 444 /* Propagate real device state to vlan devices */ 445 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 446 vlandev = vlan_group_get_device(grp, i); 447 if (!vlandev) 448 continue; 449 450 vlan_transfer_operstate(dev, vlandev); 451 } 452 break; 453 454 case NETDEV_CHANGEADDR: 455 /* Adjust unicast filters on underlying device */ 456 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; 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_sync_address(dev, vlandev); 466 } 467 break; 468 469 case NETDEV_FEAT_CHANGE: 470 /* Propagate device features to underlying device */ 471 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 472 vlandev = vlan_group_get_device(grp, i); 473 if (!vlandev) 474 continue; 475 476 vlan_transfer_features(dev, vlandev); 477 } 478 479 break; 480 481 case NETDEV_DOWN: 482 /* Put all VLANs for this dev in the down state too. */ 483 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 484 vlandev = vlan_group_get_device(grp, i); 485 if (!vlandev) 486 continue; 487 488 flgs = vlandev->flags; 489 if (!(flgs & IFF_UP)) 490 continue; 491 492 dev_change_flags(vlandev, flgs & ~IFF_UP); 493 } 494 break; 495 496 case NETDEV_UP: 497 /* Put all VLANs for this dev in the up state too. */ 498 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 499 vlandev = vlan_group_get_device(grp, i); 500 if (!vlandev) 501 continue; 502 503 flgs = vlandev->flags; 504 if (flgs & IFF_UP) 505 continue; 506 507 dev_change_flags(vlandev, flgs | IFF_UP); 508 } 509 break; 510 511 case NETDEV_UNREGISTER: 512 /* Delete all VLANs for this dev. */ 513 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 514 vlandev = vlan_group_get_device(grp, i); 515 if (!vlandev) 516 continue; 517 518 /* unregistration of last vlan destroys group, abort 519 * afterwards */ 520 if (grp->nr_vlans == 1) 521 i = VLAN_GROUP_ARRAY_LEN; 522 523 unregister_vlan_dev(vlandev); 524 } 525 break; 526 } 527 528 out: 529 return NOTIFY_DONE; 530 } 531 532 static struct notifier_block vlan_notifier_block __read_mostly = { 533 .notifier_call = vlan_device_event, 534 }; 535 536 /* 537 * VLAN IOCTL handler. 538 * o execute requested action or pass command to the device driver 539 * arg is really a struct vlan_ioctl_args __user *. 540 */ 541 static int vlan_ioctl_handler(struct net *net, void __user *arg) 542 { 543 int err; 544 struct vlan_ioctl_args args; 545 struct net_device *dev = NULL; 546 547 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 548 return -EFAULT; 549 550 /* Null terminate this sucker, just in case. */ 551 args.device1[23] = 0; 552 args.u.device2[23] = 0; 553 554 rtnl_lock(); 555 556 switch (args.cmd) { 557 case SET_VLAN_INGRESS_PRIORITY_CMD: 558 case SET_VLAN_EGRESS_PRIORITY_CMD: 559 case SET_VLAN_FLAG_CMD: 560 case ADD_VLAN_CMD: 561 case DEL_VLAN_CMD: 562 case GET_VLAN_REALDEV_NAME_CMD: 563 case GET_VLAN_VID_CMD: 564 err = -ENODEV; 565 dev = __dev_get_by_name(net, args.device1); 566 if (!dev) 567 goto out; 568 569 err = -EINVAL; 570 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 571 goto out; 572 } 573 574 switch (args.cmd) { 575 case SET_VLAN_INGRESS_PRIORITY_CMD: 576 err = -EPERM; 577 if (!capable(CAP_NET_ADMIN)) 578 break; 579 vlan_dev_set_ingress_priority(dev, 580 args.u.skb_priority, 581 args.vlan_qos); 582 err = 0; 583 break; 584 585 case SET_VLAN_EGRESS_PRIORITY_CMD: 586 err = -EPERM; 587 if (!capable(CAP_NET_ADMIN)) 588 break; 589 err = vlan_dev_set_egress_priority(dev, 590 args.u.skb_priority, 591 args.vlan_qos); 592 break; 593 594 case SET_VLAN_FLAG_CMD: 595 err = -EPERM; 596 if (!capable(CAP_NET_ADMIN)) 597 break; 598 err = vlan_dev_change_flags(dev, 599 args.vlan_qos ? args.u.flag : 0, 600 args.u.flag); 601 break; 602 603 case SET_VLAN_NAME_TYPE_CMD: 604 err = -EPERM; 605 if (!capable(CAP_NET_ADMIN)) 606 break; 607 if ((args.u.name_type >= 0) && 608 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 609 struct vlan_net *vn; 610 611 vn = net_generic(net, vlan_net_id); 612 vn->name_type = args.u.name_type; 613 err = 0; 614 } else { 615 err = -EINVAL; 616 } 617 break; 618 619 case ADD_VLAN_CMD: 620 err = -EPERM; 621 if (!capable(CAP_NET_ADMIN)) 622 break; 623 err = register_vlan_device(dev, args.u.VID); 624 break; 625 626 case DEL_VLAN_CMD: 627 err = -EPERM; 628 if (!capable(CAP_NET_ADMIN)) 629 break; 630 unregister_vlan_dev(dev); 631 err = 0; 632 break; 633 634 case GET_VLAN_REALDEV_NAME_CMD: 635 err = 0; 636 vlan_dev_get_realdev_name(dev, args.u.device2); 637 if (copy_to_user(arg, &args, 638 sizeof(struct vlan_ioctl_args))) 639 err = -EFAULT; 640 break; 641 642 case GET_VLAN_VID_CMD: 643 err = 0; 644 args.u.VID = vlan_dev_vlan_id(dev); 645 if (copy_to_user(arg, &args, 646 sizeof(struct vlan_ioctl_args))) 647 err = -EFAULT; 648 break; 649 650 default: 651 err = -EOPNOTSUPP; 652 break; 653 } 654 out: 655 rtnl_unlock(); 656 return err; 657 } 658 659 static int vlan_init_net(struct net *net) 660 { 661 int err; 662 struct vlan_net *vn; 663 664 err = -ENOMEM; 665 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL); 666 if (vn == NULL) 667 goto err_alloc; 668 669 err = net_assign_generic(net, vlan_net_id, vn); 670 if (err < 0) 671 goto err_assign; 672 673 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 674 675 err = vlan_proc_init(net); 676 if (err < 0) 677 goto err_proc; 678 679 return 0; 680 681 err_proc: 682 /* nothing */ 683 err_assign: 684 kfree(vn); 685 err_alloc: 686 return err; 687 } 688 689 static void vlan_exit_net(struct net *net) 690 { 691 struct vlan_net *vn; 692 693 vn = net_generic(net, vlan_net_id); 694 rtnl_kill_links(net, &vlan_link_ops); 695 vlan_proc_cleanup(net); 696 kfree(vn); 697 } 698 699 static struct pernet_operations vlan_net_ops = { 700 .init = vlan_init_net, 701 .exit = vlan_exit_net, 702 }; 703 704 static int __init vlan_proto_init(void) 705 { 706 int err; 707 708 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); 709 pr_info("All bugs added by %s\n", vlan_buggyright); 710 711 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops); 712 if (err < 0) 713 goto err0; 714 715 err = register_netdevice_notifier(&vlan_notifier_block); 716 if (err < 0) 717 goto err2; 718 719 err = vlan_gvrp_init(); 720 if (err < 0) 721 goto err3; 722 723 err = vlan_netlink_init(); 724 if (err < 0) 725 goto err4; 726 727 dev_add_pack(&vlan_packet_type); 728 vlan_ioctl_set(vlan_ioctl_handler); 729 return 0; 730 731 err4: 732 vlan_gvrp_uninit(); 733 err3: 734 unregister_netdevice_notifier(&vlan_notifier_block); 735 err2: 736 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 737 err0: 738 return err; 739 } 740 741 static void __exit vlan_cleanup_module(void) 742 { 743 unsigned int i; 744 745 vlan_ioctl_set(NULL); 746 vlan_netlink_fini(); 747 748 unregister_netdevice_notifier(&vlan_notifier_block); 749 750 dev_remove_pack(&vlan_packet_type); 751 752 /* This table must be empty if there are no module references left. */ 753 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) 754 BUG_ON(!hlist_empty(&vlan_group_hash[i])); 755 756 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 757 synchronize_net(); 758 759 vlan_gvrp_uninit(); 760 } 761 762 module_init(vlan_proto_init); 763 module_exit(vlan_cleanup_module); 764 765 MODULE_LICENSE("GPL"); 766 MODULE_VERSION(DRV_VERSION); 767