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 struct netlink_ext_ack *extack) 123 { 124 const char *name = real_dev->name; 125 126 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { 127 pr_info("VLANs not supported on %s\n", name); 128 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device"); 129 return -EOPNOTSUPP; 130 } 131 132 if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) { 133 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists"); 134 return -EEXIST; 135 } 136 137 return 0; 138 } 139 140 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack) 141 { 142 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 143 struct net_device *real_dev = vlan->real_dev; 144 u16 vlan_id = vlan->vlan_id; 145 struct vlan_info *vlan_info; 146 struct vlan_group *grp; 147 int err; 148 149 err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id); 150 if (err) 151 return err; 152 153 vlan_info = rtnl_dereference(real_dev->vlan_info); 154 /* vlan_info should be there now. vlan_vid_add took care of it */ 155 BUG_ON(!vlan_info); 156 157 grp = &vlan_info->grp; 158 if (grp->nr_vlan_devs == 0) { 159 err = vlan_gvrp_init_applicant(real_dev); 160 if (err < 0) 161 goto out_vid_del; 162 err = vlan_mvrp_init_applicant(real_dev); 163 if (err < 0) 164 goto out_uninit_gvrp; 165 } 166 167 err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id); 168 if (err < 0) 169 goto out_uninit_mvrp; 170 171 vlan->nest_level = dev_get_nest_level(real_dev) + 1; 172 err = register_netdevice(dev); 173 if (err < 0) 174 goto out_uninit_mvrp; 175 176 err = netdev_upper_dev_link(real_dev, dev, extack); 177 if (err) 178 goto out_unregister_netdev; 179 180 /* Account for reference in struct vlan_dev_priv */ 181 dev_hold(real_dev); 182 183 netif_stacked_transfer_operstate(real_dev, dev); 184 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ 185 186 /* So, got the sucker initialized, now lets place 187 * it into our local structure. 188 */ 189 vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev); 190 grp->nr_vlan_devs++; 191 192 return 0; 193 194 out_unregister_netdev: 195 unregister_netdevice(dev); 196 out_uninit_mvrp: 197 if (grp->nr_vlan_devs == 0) 198 vlan_mvrp_uninit_applicant(real_dev); 199 out_uninit_gvrp: 200 if (grp->nr_vlan_devs == 0) 201 vlan_gvrp_uninit_applicant(real_dev); 202 out_vid_del: 203 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id); 204 return err; 205 } 206 207 /* Attach a VLAN device to a mac address (ie Ethernet Card). 208 * Returns 0 if the device was created or a negative error code otherwise. 209 */ 210 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 211 { 212 struct net_device *new_dev; 213 struct vlan_dev_priv *vlan; 214 struct net *net = dev_net(real_dev); 215 struct vlan_net *vn = net_generic(net, vlan_net_id); 216 char name[IFNAMSIZ]; 217 int err; 218 219 if (vlan_id >= VLAN_VID_MASK) 220 return -ERANGE; 221 222 err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id, 223 NULL); 224 if (err < 0) 225 return err; 226 227 /* Gotta set up the fields for the device. */ 228 switch (vn->name_type) { 229 case VLAN_NAME_TYPE_RAW_PLUS_VID: 230 /* name will look like: eth1.0005 */ 231 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 232 break; 233 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 234 /* Put our vlan.VID in the name. 235 * Name will look like: vlan5 236 */ 237 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 238 break; 239 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 240 /* Put our vlan.VID in the name. 241 * Name will look like: eth0.5 242 */ 243 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 244 break; 245 case VLAN_NAME_TYPE_PLUS_VID: 246 /* Put our vlan.VID in the name. 247 * Name will look like: vlan0005 248 */ 249 default: 250 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 251 } 252 253 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, 254 NET_NAME_UNKNOWN, vlan_setup); 255 256 if (new_dev == NULL) 257 return -ENOBUFS; 258 259 dev_net_set(new_dev, net); 260 /* need 4 bytes for extra VLAN header info, 261 * hope the underlying device can handle it. 262 */ 263 new_dev->mtu = real_dev->mtu; 264 265 vlan = vlan_dev_priv(new_dev); 266 vlan->vlan_proto = htons(ETH_P_8021Q); 267 vlan->vlan_id = vlan_id; 268 vlan->real_dev = real_dev; 269 vlan->dent = NULL; 270 vlan->flags = VLAN_FLAG_REORDER_HDR; 271 272 new_dev->rtnl_link_ops = &vlan_link_ops; 273 err = register_vlan_dev(new_dev, NULL); 274 if (err < 0) 275 goto out_free_newdev; 276 277 return 0; 278 279 out_free_newdev: 280 if (new_dev->reg_state == NETREG_UNINITIALIZED) 281 free_netdev(new_dev); 282 return err; 283 } 284 285 static void vlan_sync_address(struct net_device *dev, 286 struct net_device *vlandev) 287 { 288 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 289 290 /* May be called without an actual change */ 291 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr)) 292 return; 293 294 /* vlan continues to inherit address of lower device */ 295 if (vlan_dev_inherit_address(vlandev, dev)) 296 goto out; 297 298 /* vlan address was different from the old address and is equal to 299 * the new address */ 300 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 301 ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 302 dev_uc_del(dev, vlandev->dev_addr); 303 304 /* vlan address was equal to the old address and is different from 305 * the new address */ 306 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 307 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 308 dev_uc_add(dev, vlandev->dev_addr); 309 310 out: 311 ether_addr_copy(vlan->real_dev_addr, dev->dev_addr); 312 } 313 314 static void vlan_transfer_features(struct net_device *dev, 315 struct net_device *vlandev) 316 { 317 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 318 319 vlandev->gso_max_size = dev->gso_max_size; 320 vlandev->gso_max_segs = dev->gso_max_segs; 321 322 if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto)) 323 vlandev->hard_header_len = dev->hard_header_len; 324 else 325 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 326 327 #if IS_ENABLED(CONFIG_FCOE) 328 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 329 #endif 330 331 vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 332 vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE); 333 vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev); 334 335 netdev_update_features(vlandev); 336 } 337 338 static int __vlan_device_event(struct net_device *dev, unsigned long event) 339 { 340 int err = 0; 341 342 switch (event) { 343 case NETDEV_CHANGENAME: 344 vlan_proc_rem_dev(dev); 345 err = vlan_proc_add_dev(dev); 346 break; 347 case NETDEV_REGISTER: 348 err = vlan_proc_add_dev(dev); 349 break; 350 case NETDEV_UNREGISTER: 351 vlan_proc_rem_dev(dev); 352 break; 353 } 354 355 return err; 356 } 357 358 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 359 void *ptr) 360 { 361 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr); 362 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 363 struct vlan_group *grp; 364 struct vlan_info *vlan_info; 365 int i, flgs; 366 struct net_device *vlandev; 367 struct vlan_dev_priv *vlan; 368 bool last = false; 369 LIST_HEAD(list); 370 int err; 371 372 if (is_vlan_dev(dev)) { 373 int err = __vlan_device_event(dev, event); 374 375 if (err) 376 return notifier_from_errno(err); 377 } 378 379 if ((event == NETDEV_UP) && 380 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) { 381 pr_info("adding VLAN 0 to HW filter on device %s\n", 382 dev->name); 383 vlan_vid_add(dev, htons(ETH_P_8021Q), 0); 384 } 385 if (event == NETDEV_DOWN && 386 (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) 387 vlan_vid_del(dev, htons(ETH_P_8021Q), 0); 388 389 vlan_info = rtnl_dereference(dev->vlan_info); 390 if (!vlan_info) 391 goto out; 392 grp = &vlan_info->grp; 393 394 /* It is OK that we do not hold the group lock right now, 395 * as we run under the RTNL lock. 396 */ 397 398 switch (event) { 399 case NETDEV_CHANGE: 400 /* Propagate real device state to vlan devices */ 401 vlan_group_for_each_dev(grp, i, vlandev) 402 netif_stacked_transfer_operstate(dev, vlandev); 403 break; 404 405 case NETDEV_CHANGEADDR: 406 /* Adjust unicast filters on underlying device */ 407 vlan_group_for_each_dev(grp, i, vlandev) { 408 flgs = vlandev->flags; 409 if (!(flgs & IFF_UP)) 410 continue; 411 412 vlan_sync_address(dev, vlandev); 413 } 414 break; 415 416 case NETDEV_CHANGEMTU: 417 vlan_group_for_each_dev(grp, i, vlandev) { 418 if (vlandev->mtu <= dev->mtu) 419 continue; 420 421 dev_set_mtu(vlandev, dev->mtu); 422 } 423 break; 424 425 case NETDEV_FEAT_CHANGE: 426 /* Propagate device features to underlying device */ 427 vlan_group_for_each_dev(grp, i, vlandev) 428 vlan_transfer_features(dev, vlandev); 429 break; 430 431 case NETDEV_DOWN: { 432 struct net_device *tmp; 433 LIST_HEAD(close_list); 434 435 /* Put all VLANs for this dev in the down state too. */ 436 vlan_group_for_each_dev(grp, i, vlandev) { 437 flgs = vlandev->flags; 438 if (!(flgs & IFF_UP)) 439 continue; 440 441 vlan = vlan_dev_priv(vlandev); 442 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 443 list_add(&vlandev->close_list, &close_list); 444 } 445 446 dev_close_many(&close_list, false); 447 448 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) { 449 netif_stacked_transfer_operstate(dev, vlandev); 450 list_del_init(&vlandev->close_list); 451 } 452 list_del(&close_list); 453 break; 454 } 455 case NETDEV_UP: 456 /* Put all VLANs for this dev in the up state too. */ 457 vlan_group_for_each_dev(grp, i, vlandev) { 458 flgs = dev_get_flags(vlandev); 459 if (flgs & IFF_UP) 460 continue; 461 462 vlan = vlan_dev_priv(vlandev); 463 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 464 dev_change_flags(vlandev, flgs | IFF_UP, 465 extack); 466 netif_stacked_transfer_operstate(dev, vlandev); 467 } 468 break; 469 470 case NETDEV_UNREGISTER: 471 /* twiddle thumbs on netns device moves */ 472 if (dev->reg_state != NETREG_UNREGISTERING) 473 break; 474 475 vlan_group_for_each_dev(grp, i, vlandev) { 476 /* removal of last vid destroys vlan_info, abort 477 * afterwards */ 478 if (vlan_info->nr_vids == 1) 479 last = true; 480 481 unregister_vlan_dev(vlandev, &list); 482 if (last) 483 break; 484 } 485 unregister_netdevice_many(&list); 486 break; 487 488 case NETDEV_PRE_TYPE_CHANGE: 489 /* Forbid underlaying device to change its type. */ 490 if (vlan_uses_dev(dev)) 491 return NOTIFY_BAD; 492 break; 493 494 case NETDEV_NOTIFY_PEERS: 495 case NETDEV_BONDING_FAILOVER: 496 case NETDEV_RESEND_IGMP: 497 /* Propagate to vlan devices */ 498 vlan_group_for_each_dev(grp, i, vlandev) 499 call_netdevice_notifiers(event, vlandev); 500 break; 501 502 case NETDEV_CVLAN_FILTER_PUSH_INFO: 503 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q)); 504 if (err) 505 return notifier_from_errno(err); 506 break; 507 508 case NETDEV_CVLAN_FILTER_DROP_INFO: 509 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q)); 510 break; 511 512 case NETDEV_SVLAN_FILTER_PUSH_INFO: 513 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD)); 514 if (err) 515 return notifier_from_errno(err); 516 break; 517 518 case NETDEV_SVLAN_FILTER_DROP_INFO: 519 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD)); 520 break; 521 } 522 523 out: 524 return NOTIFY_DONE; 525 } 526 527 static struct notifier_block vlan_notifier_block __read_mostly = { 528 .notifier_call = vlan_device_event, 529 }; 530 531 /* 532 * VLAN IOCTL handler. 533 * o execute requested action or pass command to the device driver 534 * arg is really a struct vlan_ioctl_args __user *. 535 */ 536 static int vlan_ioctl_handler(struct net *net, void __user *arg) 537 { 538 int err; 539 struct vlan_ioctl_args args; 540 struct net_device *dev = NULL; 541 542 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 543 return -EFAULT; 544 545 /* Null terminate this sucker, just in case. */ 546 args.device1[sizeof(args.device1) - 1] = 0; 547 args.u.device2[sizeof(args.u.device2) - 1] = 0; 548 549 rtnl_lock(); 550 551 switch (args.cmd) { 552 case SET_VLAN_INGRESS_PRIORITY_CMD: 553 case SET_VLAN_EGRESS_PRIORITY_CMD: 554 case SET_VLAN_FLAG_CMD: 555 case ADD_VLAN_CMD: 556 case DEL_VLAN_CMD: 557 case GET_VLAN_REALDEV_NAME_CMD: 558 case GET_VLAN_VID_CMD: 559 err = -ENODEV; 560 dev = __dev_get_by_name(net, args.device1); 561 if (!dev) 562 goto out; 563 564 err = -EINVAL; 565 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 566 goto out; 567 } 568 569 switch (args.cmd) { 570 case SET_VLAN_INGRESS_PRIORITY_CMD: 571 err = -EPERM; 572 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 573 break; 574 vlan_dev_set_ingress_priority(dev, 575 args.u.skb_priority, 576 args.vlan_qos); 577 err = 0; 578 break; 579 580 case SET_VLAN_EGRESS_PRIORITY_CMD: 581 err = -EPERM; 582 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 583 break; 584 err = vlan_dev_set_egress_priority(dev, 585 args.u.skb_priority, 586 args.vlan_qos); 587 break; 588 589 case SET_VLAN_FLAG_CMD: 590 err = -EPERM; 591 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 592 break; 593 err = vlan_dev_change_flags(dev, 594 args.vlan_qos ? args.u.flag : 0, 595 args.u.flag); 596 break; 597 598 case SET_VLAN_NAME_TYPE_CMD: 599 err = -EPERM; 600 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 601 break; 602 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) { 603 struct vlan_net *vn; 604 605 vn = net_generic(net, vlan_net_id); 606 vn->name_type = args.u.name_type; 607 err = 0; 608 } else { 609 err = -EINVAL; 610 } 611 break; 612 613 case ADD_VLAN_CMD: 614 err = -EPERM; 615 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 616 break; 617 err = register_vlan_device(dev, args.u.VID); 618 break; 619 620 case DEL_VLAN_CMD: 621 err = -EPERM; 622 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 623 break; 624 unregister_vlan_dev(dev, NULL); 625 err = 0; 626 break; 627 628 case GET_VLAN_REALDEV_NAME_CMD: 629 err = 0; 630 vlan_dev_get_realdev_name(dev, args.u.device2); 631 if (copy_to_user(arg, &args, 632 sizeof(struct vlan_ioctl_args))) 633 err = -EFAULT; 634 break; 635 636 case GET_VLAN_VID_CMD: 637 err = 0; 638 args.u.VID = vlan_dev_vlan_id(dev); 639 if (copy_to_user(arg, &args, 640 sizeof(struct vlan_ioctl_args))) 641 err = -EFAULT; 642 break; 643 644 default: 645 err = -EOPNOTSUPP; 646 break; 647 } 648 out: 649 rtnl_unlock(); 650 return err; 651 } 652 653 static int __net_init vlan_init_net(struct net *net) 654 { 655 struct vlan_net *vn = net_generic(net, vlan_net_id); 656 int err; 657 658 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 659 660 err = vlan_proc_init(net); 661 662 return err; 663 } 664 665 static void __net_exit vlan_exit_net(struct net *net) 666 { 667 vlan_proc_cleanup(net); 668 } 669 670 static struct pernet_operations vlan_net_ops = { 671 .init = vlan_init_net, 672 .exit = vlan_exit_net, 673 .id = &vlan_net_id, 674 .size = sizeof(struct vlan_net), 675 }; 676 677 static int __init vlan_proto_init(void) 678 { 679 int err; 680 681 pr_info("%s v%s\n", vlan_fullname, vlan_version); 682 683 err = register_pernet_subsys(&vlan_net_ops); 684 if (err < 0) 685 goto err0; 686 687 err = register_netdevice_notifier(&vlan_notifier_block); 688 if (err < 0) 689 goto err2; 690 691 err = vlan_gvrp_init(); 692 if (err < 0) 693 goto err3; 694 695 err = vlan_mvrp_init(); 696 if (err < 0) 697 goto err4; 698 699 err = vlan_netlink_init(); 700 if (err < 0) 701 goto err5; 702 703 vlan_ioctl_set(vlan_ioctl_handler); 704 return 0; 705 706 err5: 707 vlan_mvrp_uninit(); 708 err4: 709 vlan_gvrp_uninit(); 710 err3: 711 unregister_netdevice_notifier(&vlan_notifier_block); 712 err2: 713 unregister_pernet_subsys(&vlan_net_ops); 714 err0: 715 return err; 716 } 717 718 static void __exit vlan_cleanup_module(void) 719 { 720 vlan_ioctl_set(NULL); 721 722 vlan_netlink_fini(); 723 724 unregister_netdevice_notifier(&vlan_notifier_block); 725 726 unregister_pernet_subsys(&vlan_net_ops); 727 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 728 729 vlan_mvrp_uninit(); 730 vlan_gvrp_uninit(); 731 } 732 733 module_init(vlan_proto_init); 734 module_exit(vlan_cleanup_module); 735 736 MODULE_LICENSE("GPL"); 737 MODULE_VERSION(DRV_VERSION); 738