vlan.c revision b85daa5324a3c9e560a4351c17d18f49c647eb5c
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 44int vlan_net_id; 45 46/* Our listing of VLAN group(s) */ 47static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE]; 48 49const char vlan_fullname[] = "802.1Q VLAN Support"; 50const char vlan_version[] = DRV_VERSION; 51static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>"; 52static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>"; 53 54static struct packet_type vlan_packet_type __read_mostly = { 55 .type = cpu_to_be16(ETH_P_8021Q), 56 .func = vlan_skb_recv, /* VLAN receive method */ 57}; 58 59/* End of global variables definitions. */ 60 61static 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) */ 67static 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 */ 85struct 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 95static 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 104static 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 118static 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 138static void vlan_rcu_free(struct rcu_head *rcu) 139{ 140 vlan_group_free(container_of(rcu, struct vlan_group, rcu)); 141} 142 143void 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 const struct net_device_ops *ops = real_dev->netdev_ops; 148 struct vlan_group *grp; 149 u16 vlan_id = vlan->vlan_id; 150 151 ASSERT_RTNL(); 152 153 grp = __vlan_find_group(real_dev); 154 BUG_ON(!grp); 155 156 /* Take it out of our own structures, but be sure to interlock with 157 * HW accelerating devices or SW vlan input packet processing. 158 */ 159 if (real_dev->features & NETIF_F_HW_VLAN_FILTER) 160 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id); 161 162 vlan_group_set_device(grp, vlan_id, NULL); 163 grp->nr_vlans--; 164 165 synchronize_net(); 166 167 unregister_netdevice(dev); 168 169 /* If the group is now empty, kill off the group. */ 170 if (grp->nr_vlans == 0) { 171 vlan_gvrp_uninit_applicant(real_dev); 172 173 if (real_dev->features & NETIF_F_HW_VLAN_RX) 174 ops->ndo_vlan_rx_register(real_dev, NULL); 175 176 hlist_del_rcu(&grp->hlist); 177 178 /* Free the group, after all cpu's are done. */ 179 call_rcu(&grp->rcu, vlan_rcu_free); 180 } 181 182 /* Get rid of the vlan's reference to real_dev */ 183 dev_put(real_dev); 184} 185 186static void vlan_transfer_operstate(const struct net_device *dev, 187 struct net_device *vlandev) 188{ 189 /* Have to respect userspace enforced dormant state 190 * of real device, also must allow supplicant running 191 * on VLAN device 192 */ 193 if (dev->operstate == IF_OPER_DORMANT) 194 netif_dormant_on(vlandev); 195 else 196 netif_dormant_off(vlandev); 197 198 if (netif_carrier_ok(dev)) { 199 if (!netif_carrier_ok(vlandev)) 200 netif_carrier_on(vlandev); 201 } else { 202 if (netif_carrier_ok(vlandev)) 203 netif_carrier_off(vlandev); 204 } 205} 206 207int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id) 208{ 209 const char *name = real_dev->name; 210 const struct net_device_ops *ops = real_dev->netdev_ops; 211 212 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { 213 pr_info("8021q: VLANs not supported on %s\n", name); 214 return -EOPNOTSUPP; 215 } 216 217 if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) { 218 pr_info("8021q: device %s has buggy VLAN hw accel\n", name); 219 return -EOPNOTSUPP; 220 } 221 222 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && 223 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) { 224 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name); 225 return -EOPNOTSUPP; 226 } 227 228 if (__find_vlan_dev(real_dev, vlan_id) != NULL) 229 return -EEXIST; 230 231 return 0; 232} 233 234int register_vlan_dev(struct net_device *dev) 235{ 236 struct vlan_dev_info *vlan = vlan_dev_info(dev); 237 struct net_device *real_dev = vlan->real_dev; 238 const struct net_device_ops *ops = real_dev->netdev_ops; 239 u16 vlan_id = vlan->vlan_id; 240 struct vlan_group *grp, *ngrp = NULL; 241 int err; 242 243 grp = __vlan_find_group(real_dev); 244 if (!grp) { 245 ngrp = grp = vlan_group_alloc(real_dev); 246 if (!grp) 247 return -ENOBUFS; 248 err = vlan_gvrp_init_applicant(real_dev); 249 if (err < 0) 250 goto out_free_group; 251 } 252 253 err = vlan_group_prealloc_vid(grp, vlan_id); 254 if (err < 0) 255 goto out_uninit_applicant; 256 257 err = register_netdevice(dev); 258 if (err < 0) 259 goto out_uninit_applicant; 260 261 /* Account for reference in struct vlan_dev_info */ 262 dev_hold(real_dev); 263 264 vlan_transfer_operstate(real_dev, dev); 265 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ 266 267 /* So, got the sucker initialized, now lets place 268 * it into our local structure. 269 */ 270 vlan_group_set_device(grp, vlan_id, dev); 271 grp->nr_vlans++; 272 273 if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX) 274 ops->ndo_vlan_rx_register(real_dev, ngrp); 275 if (real_dev->features & NETIF_F_HW_VLAN_FILTER) 276 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id); 277 278 return 0; 279 280out_uninit_applicant: 281 if (ngrp) 282 vlan_gvrp_uninit_applicant(real_dev); 283out_free_group: 284 if (ngrp) 285 vlan_group_free(ngrp); 286 return err; 287} 288 289/* Attach a VLAN device to a mac address (ie Ethernet Card). 290 * Returns 0 if the device was created or a negative error code otherwise. 291 */ 292static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 293{ 294 struct net_device *new_dev; 295 struct net *net = dev_net(real_dev); 296 struct vlan_net *vn = net_generic(net, vlan_net_id); 297 char name[IFNAMSIZ]; 298 int err; 299 300 if (vlan_id >= VLAN_VID_MASK) 301 return -ERANGE; 302 303 err = vlan_check_real_dev(real_dev, vlan_id); 304 if (err < 0) 305 return err; 306 307 /* Gotta set up the fields for the device. */ 308 switch (vn->name_type) { 309 case VLAN_NAME_TYPE_RAW_PLUS_VID: 310 /* name will look like: eth1.0005 */ 311 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 312 break; 313 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 314 /* Put our vlan.VID in the name. 315 * Name will look like: vlan5 316 */ 317 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 318 break; 319 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 320 /* Put our vlan.VID in the name. 321 * Name will look like: eth0.5 322 */ 323 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 324 break; 325 case VLAN_NAME_TYPE_PLUS_VID: 326 /* Put our vlan.VID in the name. 327 * Name will look like: vlan0005 328 */ 329 default: 330 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 331 } 332 333 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, 334 vlan_setup); 335 336 if (new_dev == NULL) 337 return -ENOBUFS; 338 339 dev_net_set(new_dev, net); 340 /* need 4 bytes for extra VLAN header info, 341 * hope the underlying device can handle it. 342 */ 343 new_dev->mtu = real_dev->mtu; 344 345 vlan_dev_info(new_dev)->vlan_id = vlan_id; 346 vlan_dev_info(new_dev)->real_dev = real_dev; 347 vlan_dev_info(new_dev)->dent = NULL; 348 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR; 349 350 new_dev->rtnl_link_ops = &vlan_link_ops; 351 err = register_vlan_dev(new_dev); 352 if (err < 0) 353 goto out_free_newdev; 354 355 return 0; 356 357out_free_newdev: 358 free_netdev(new_dev); 359 return err; 360} 361 362static void vlan_sync_address(struct net_device *dev, 363 struct net_device *vlandev) 364{ 365 struct vlan_dev_info *vlan = vlan_dev_info(vlandev); 366 367 /* May be called without an actual change */ 368 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) 369 return; 370 371 /* vlan address was different from the old address and is equal to 372 * the new address */ 373 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 374 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 375 dev_unicast_delete(dev, vlandev->dev_addr); 376 377 /* vlan address was equal to the old address and is different from 378 * the new address */ 379 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 380 compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 381 dev_unicast_add(dev, vlandev->dev_addr); 382 383 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); 384} 385 386static void vlan_transfer_features(struct net_device *dev, 387 struct net_device *vlandev) 388{ 389 unsigned long old_features = vlandev->features; 390 391 vlandev->features &= ~dev->vlan_features; 392 vlandev->features |= dev->features & dev->vlan_features; 393 vlandev->gso_max_size = dev->gso_max_size; 394#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 395 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 396#endif 397 398 if (old_features != vlandev->features) 399 netdev_features_change(vlandev); 400} 401 402static 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 422static 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_CHANGEMTU: 469 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 470 vlandev = vlan_group_get_device(grp, i); 471 if (!vlandev) 472 continue; 473 474 if (vlandev->mtu <= dev->mtu) 475 continue; 476 477 dev_set_mtu(vlandev, dev->mtu); 478 } 479 break; 480 481 case NETDEV_FEAT_CHANGE: 482 /* Propagate device features to underlying device */ 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 vlan_transfer_features(dev, vlandev); 489 } 490 491 break; 492 493 case NETDEV_DOWN: 494 /* Put all VLANs for this dev in the down state too. */ 495 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 496 vlandev = vlan_group_get_device(grp, i); 497 if (!vlandev) 498 continue; 499 500 flgs = vlandev->flags; 501 if (!(flgs & IFF_UP)) 502 continue; 503 504 dev_change_flags(vlandev, flgs & ~IFF_UP); 505 vlan_transfer_operstate(dev, vlandev); 506 } 507 break; 508 509 case NETDEV_UP: 510 /* Put all VLANs for this dev in the up state too. */ 511 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 512 vlandev = vlan_group_get_device(grp, i); 513 if (!vlandev) 514 continue; 515 516 flgs = vlandev->flags; 517 if (flgs & IFF_UP) 518 continue; 519 520 dev_change_flags(vlandev, flgs | IFF_UP); 521 vlan_transfer_operstate(dev, vlandev); 522 } 523 break; 524 525 case NETDEV_UNREGISTER: 526 /* Delete all VLANs for this dev. */ 527 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 528 vlandev = vlan_group_get_device(grp, i); 529 if (!vlandev) 530 continue; 531 532 /* unregistration of last vlan destroys group, abort 533 * afterwards */ 534 if (grp->nr_vlans == 1) 535 i = VLAN_GROUP_ARRAY_LEN; 536 537 unregister_vlan_dev(vlandev); 538 } 539 break; 540 } 541 542out: 543 return NOTIFY_DONE; 544} 545 546static struct notifier_block vlan_notifier_block __read_mostly = { 547 .notifier_call = vlan_device_event, 548}; 549 550/* 551 * VLAN IOCTL handler. 552 * o execute requested action or pass command to the device driver 553 * arg is really a struct vlan_ioctl_args __user *. 554 */ 555static int vlan_ioctl_handler(struct net *net, void __user *arg) 556{ 557 int err; 558 struct vlan_ioctl_args args; 559 struct net_device *dev = NULL; 560 561 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 562 return -EFAULT; 563 564 /* Null terminate this sucker, just in case. */ 565 args.device1[23] = 0; 566 args.u.device2[23] = 0; 567 568 rtnl_lock(); 569 570 switch (args.cmd) { 571 case SET_VLAN_INGRESS_PRIORITY_CMD: 572 case SET_VLAN_EGRESS_PRIORITY_CMD: 573 case SET_VLAN_FLAG_CMD: 574 case ADD_VLAN_CMD: 575 case DEL_VLAN_CMD: 576 case GET_VLAN_REALDEV_NAME_CMD: 577 case GET_VLAN_VID_CMD: 578 err = -ENODEV; 579 dev = __dev_get_by_name(net, args.device1); 580 if (!dev) 581 goto out; 582 583 err = -EINVAL; 584 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 585 goto out; 586 } 587 588 switch (args.cmd) { 589 case SET_VLAN_INGRESS_PRIORITY_CMD: 590 err = -EPERM; 591 if (!capable(CAP_NET_ADMIN)) 592 break; 593 vlan_dev_set_ingress_priority(dev, 594 args.u.skb_priority, 595 args.vlan_qos); 596 err = 0; 597 break; 598 599 case SET_VLAN_EGRESS_PRIORITY_CMD: 600 err = -EPERM; 601 if (!capable(CAP_NET_ADMIN)) 602 break; 603 err = vlan_dev_set_egress_priority(dev, 604 args.u.skb_priority, 605 args.vlan_qos); 606 break; 607 608 case SET_VLAN_FLAG_CMD: 609 err = -EPERM; 610 if (!capable(CAP_NET_ADMIN)) 611 break; 612 err = vlan_dev_change_flags(dev, 613 args.vlan_qos ? args.u.flag : 0, 614 args.u.flag); 615 break; 616 617 case SET_VLAN_NAME_TYPE_CMD: 618 err = -EPERM; 619 if (!capable(CAP_NET_ADMIN)) 620 break; 621 if ((args.u.name_type >= 0) && 622 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 623 struct vlan_net *vn; 624 625 vn = net_generic(net, vlan_net_id); 626 vn->name_type = args.u.name_type; 627 err = 0; 628 } else { 629 err = -EINVAL; 630 } 631 break; 632 633 case ADD_VLAN_CMD: 634 err = -EPERM; 635 if (!capable(CAP_NET_ADMIN)) 636 break; 637 err = register_vlan_device(dev, args.u.VID); 638 break; 639 640 case DEL_VLAN_CMD: 641 err = -EPERM; 642 if (!capable(CAP_NET_ADMIN)) 643 break; 644 unregister_vlan_dev(dev); 645 err = 0; 646 break; 647 648 case GET_VLAN_REALDEV_NAME_CMD: 649 err = 0; 650 vlan_dev_get_realdev_name(dev, args.u.device2); 651 if (copy_to_user(arg, &args, 652 sizeof(struct vlan_ioctl_args))) 653 err = -EFAULT; 654 break; 655 656 case GET_VLAN_VID_CMD: 657 err = 0; 658 args.u.VID = vlan_dev_vlan_id(dev); 659 if (copy_to_user(arg, &args, 660 sizeof(struct vlan_ioctl_args))) 661 err = -EFAULT; 662 break; 663 664 default: 665 err = -EOPNOTSUPP; 666 break; 667 } 668out: 669 rtnl_unlock(); 670 return err; 671} 672 673static int vlan_init_net(struct net *net) 674{ 675 int err; 676 struct vlan_net *vn; 677 678 err = -ENOMEM; 679 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL); 680 if (vn == NULL) 681 goto err_alloc; 682 683 err = net_assign_generic(net, vlan_net_id, vn); 684 if (err < 0) 685 goto err_assign; 686 687 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 688 689 err = vlan_proc_init(net); 690 if (err < 0) 691 goto err_proc; 692 693 return 0; 694 695err_proc: 696 /* nothing */ 697err_assign: 698 kfree(vn); 699err_alloc: 700 return err; 701} 702 703static void vlan_exit_net(struct net *net) 704{ 705 struct vlan_net *vn; 706 707 vn = net_generic(net, vlan_net_id); 708 rtnl_kill_links(net, &vlan_link_ops); 709 vlan_proc_cleanup(net); 710 kfree(vn); 711} 712 713static struct pernet_operations vlan_net_ops = { 714 .init = vlan_init_net, 715 .exit = vlan_exit_net, 716}; 717 718static int __init vlan_proto_init(void) 719{ 720 int err; 721 722 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); 723 pr_info("All bugs added by %s\n", vlan_buggyright); 724 725 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops); 726 if (err < 0) 727 goto err0; 728 729 err = register_netdevice_notifier(&vlan_notifier_block); 730 if (err < 0) 731 goto err2; 732 733 err = vlan_gvrp_init(); 734 if (err < 0) 735 goto err3; 736 737 err = vlan_netlink_init(); 738 if (err < 0) 739 goto err4; 740 741 dev_add_pack(&vlan_packet_type); 742 vlan_ioctl_set(vlan_ioctl_handler); 743 return 0; 744 745err4: 746 vlan_gvrp_uninit(); 747err3: 748 unregister_netdevice_notifier(&vlan_notifier_block); 749err2: 750 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 751err0: 752 return err; 753} 754 755static void __exit vlan_cleanup_module(void) 756{ 757 unsigned int i; 758 759 vlan_ioctl_set(NULL); 760 vlan_netlink_fini(); 761 762 unregister_netdevice_notifier(&vlan_notifier_block); 763 764 dev_remove_pack(&vlan_packet_type); 765 766 /* This table must be empty if there are no module references left. */ 767 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) 768 BUG_ON(!hlist_empty(&vlan_group_hash[i])); 769 770 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 771 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 772 773 vlan_gvrp_uninit(); 774} 775 776module_init(vlan_proto_init); 777module_exit(vlan_cleanup_module); 778 779MODULE_LICENSE("GPL"); 780MODULE_VERSION(DRV_VERSION); 781