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 const char vlan_fullname[] = "802.1Q VLAN Support"; 50 const char vlan_version[] = DRV_VERSION; 51 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>"; 52 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>"; 53 54 static 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 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 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 } 185 186 static 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 } 206 207 int 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 } 233 234 int 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; 279 280 out_uninit_applicant: 281 if (ngrp) 282 vlan_gvrp_uninit_applicant(real_dev); 283 out_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 */ 292 static 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_mq(sizeof(struct vlan_dev_info), name, 334 vlan_setup, real_dev->num_tx_queues); 335 336 if (new_dev == NULL) 337 return -ENOBUFS; 338 339 new_dev->real_num_tx_queues = real_dev->real_num_tx_queues; 340 dev_net_set(new_dev, net); 341 /* need 4 bytes for extra VLAN header info, 342 * hope the underlying device can handle it. 343 */ 344 new_dev->mtu = real_dev->mtu; 345 346 vlan_dev_info(new_dev)->vlan_id = vlan_id; 347 vlan_dev_info(new_dev)->real_dev = real_dev; 348 vlan_dev_info(new_dev)->dent = NULL; 349 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR; 350 351 new_dev->rtnl_link_ops = &vlan_link_ops; 352 err = register_vlan_dev(new_dev); 353 if (err < 0) 354 goto out_free_newdev; 355 356 return 0; 357 358 out_free_newdev: 359 free_netdev(new_dev); 360 return err; 361 } 362 363 static void vlan_sync_address(struct net_device *dev, 364 struct net_device *vlandev) 365 { 366 struct vlan_dev_info *vlan = vlan_dev_info(vlandev); 367 368 /* May be called without an actual change */ 369 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr)) 370 return; 371 372 /* vlan address was different from the old address and is equal to 373 * the new address */ 374 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 375 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 376 dev_unicast_delete(dev, vlandev->dev_addr); 377 378 /* vlan address was equal to the old address and is different from 379 * the new address */ 380 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) && 381 compare_ether_addr(vlandev->dev_addr, dev->dev_addr)) 382 dev_unicast_add(dev, vlandev->dev_addr); 383 384 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); 385 } 386 387 static void vlan_transfer_features(struct net_device *dev, 388 struct net_device *vlandev) 389 { 390 unsigned long old_features = vlandev->features; 391 392 vlandev->features &= ~dev->vlan_features; 393 vlandev->features |= dev->features & dev->vlan_features; 394 vlandev->gso_max_size = dev->gso_max_size; 395 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 396 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 397 #endif 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_CHANGEMTU: 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 if (vlandev->mtu <= dev->mtu) 476 continue; 477 478 dev_set_mtu(vlandev, dev->mtu); 479 } 480 break; 481 482 case NETDEV_FEAT_CHANGE: 483 /* Propagate device features to underlying device */ 484 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 485 vlandev = vlan_group_get_device(grp, i); 486 if (!vlandev) 487 continue; 488 489 vlan_transfer_features(dev, vlandev); 490 } 491 492 break; 493 494 case NETDEV_DOWN: 495 /* Put all VLANs for this dev in the down state too. */ 496 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 497 vlandev = vlan_group_get_device(grp, i); 498 if (!vlandev) 499 continue; 500 501 flgs = vlandev->flags; 502 if (!(flgs & IFF_UP)) 503 continue; 504 505 dev_change_flags(vlandev, flgs & ~IFF_UP); 506 vlan_transfer_operstate(dev, vlandev); 507 } 508 break; 509 510 case NETDEV_UP: 511 /* Put all VLANs for this dev in the up state too. */ 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 flgs = vlandev->flags; 518 if (flgs & IFF_UP) 519 continue; 520 521 dev_change_flags(vlandev, flgs | IFF_UP); 522 vlan_transfer_operstate(dev, vlandev); 523 } 524 break; 525 526 case NETDEV_UNREGISTER: 527 /* Delete all VLANs for this dev. */ 528 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 529 vlandev = vlan_group_get_device(grp, i); 530 if (!vlandev) 531 continue; 532 533 /* unregistration of last vlan destroys group, abort 534 * afterwards */ 535 if (grp->nr_vlans == 1) 536 i = VLAN_GROUP_ARRAY_LEN; 537 538 unregister_vlan_dev(vlandev); 539 } 540 break; 541 } 542 543 out: 544 return NOTIFY_DONE; 545 } 546 547 static struct notifier_block vlan_notifier_block __read_mostly = { 548 .notifier_call = vlan_device_event, 549 }; 550 551 /* 552 * VLAN IOCTL handler. 553 * o execute requested action or pass command to the device driver 554 * arg is really a struct vlan_ioctl_args __user *. 555 */ 556 static int vlan_ioctl_handler(struct net *net, void __user *arg) 557 { 558 int err; 559 struct vlan_ioctl_args args; 560 struct net_device *dev = NULL; 561 562 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 563 return -EFAULT; 564 565 /* Null terminate this sucker, just in case. */ 566 args.device1[23] = 0; 567 args.u.device2[23] = 0; 568 569 rtnl_lock(); 570 571 switch (args.cmd) { 572 case SET_VLAN_INGRESS_PRIORITY_CMD: 573 case SET_VLAN_EGRESS_PRIORITY_CMD: 574 case SET_VLAN_FLAG_CMD: 575 case ADD_VLAN_CMD: 576 case DEL_VLAN_CMD: 577 case GET_VLAN_REALDEV_NAME_CMD: 578 case GET_VLAN_VID_CMD: 579 err = -ENODEV; 580 dev = __dev_get_by_name(net, args.device1); 581 if (!dev) 582 goto out; 583 584 err = -EINVAL; 585 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 586 goto out; 587 } 588 589 switch (args.cmd) { 590 case SET_VLAN_INGRESS_PRIORITY_CMD: 591 err = -EPERM; 592 if (!capable(CAP_NET_ADMIN)) 593 break; 594 vlan_dev_set_ingress_priority(dev, 595 args.u.skb_priority, 596 args.vlan_qos); 597 err = 0; 598 break; 599 600 case SET_VLAN_EGRESS_PRIORITY_CMD: 601 err = -EPERM; 602 if (!capable(CAP_NET_ADMIN)) 603 break; 604 err = vlan_dev_set_egress_priority(dev, 605 args.u.skb_priority, 606 args.vlan_qos); 607 break; 608 609 case SET_VLAN_FLAG_CMD: 610 err = -EPERM; 611 if (!capable(CAP_NET_ADMIN)) 612 break; 613 err = vlan_dev_change_flags(dev, 614 args.vlan_qos ? args.u.flag : 0, 615 args.u.flag); 616 break; 617 618 case SET_VLAN_NAME_TYPE_CMD: 619 err = -EPERM; 620 if (!capable(CAP_NET_ADMIN)) 621 break; 622 if ((args.u.name_type >= 0) && 623 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 624 struct vlan_net *vn; 625 626 vn = net_generic(net, vlan_net_id); 627 vn->name_type = args.u.name_type; 628 err = 0; 629 } else { 630 err = -EINVAL; 631 } 632 break; 633 634 case ADD_VLAN_CMD: 635 err = -EPERM; 636 if (!capable(CAP_NET_ADMIN)) 637 break; 638 err = register_vlan_device(dev, args.u.VID); 639 break; 640 641 case DEL_VLAN_CMD: 642 err = -EPERM; 643 if (!capable(CAP_NET_ADMIN)) 644 break; 645 unregister_vlan_dev(dev); 646 err = 0; 647 break; 648 649 case GET_VLAN_REALDEV_NAME_CMD: 650 err = 0; 651 vlan_dev_get_realdev_name(dev, args.u.device2); 652 if (copy_to_user(arg, &args, 653 sizeof(struct vlan_ioctl_args))) 654 err = -EFAULT; 655 break; 656 657 case GET_VLAN_VID_CMD: 658 err = 0; 659 args.u.VID = vlan_dev_vlan_id(dev); 660 if (copy_to_user(arg, &args, 661 sizeof(struct vlan_ioctl_args))) 662 err = -EFAULT; 663 break; 664 665 default: 666 err = -EOPNOTSUPP; 667 break; 668 } 669 out: 670 rtnl_unlock(); 671 return err; 672 } 673 674 static int vlan_init_net(struct net *net) 675 { 676 int err; 677 struct vlan_net *vn; 678 679 err = -ENOMEM; 680 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL); 681 if (vn == NULL) 682 goto err_alloc; 683 684 err = net_assign_generic(net, vlan_net_id, vn); 685 if (err < 0) 686 goto err_assign; 687 688 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 689 690 err = vlan_proc_init(net); 691 if (err < 0) 692 goto err_proc; 693 694 return 0; 695 696 err_proc: 697 /* nothing */ 698 err_assign: 699 kfree(vn); 700 err_alloc: 701 return err; 702 } 703 704 static void vlan_exit_net(struct net *net) 705 { 706 struct vlan_net *vn; 707 708 vn = net_generic(net, vlan_net_id); 709 rtnl_kill_links(net, &vlan_link_ops); 710 vlan_proc_cleanup(net); 711 kfree(vn); 712 } 713 714 static struct pernet_operations vlan_net_ops = { 715 .init = vlan_init_net, 716 .exit = vlan_exit_net, 717 }; 718 719 static int __init vlan_proto_init(void) 720 { 721 int err; 722 723 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); 724 pr_info("All bugs added by %s\n", vlan_buggyright); 725 726 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops); 727 if (err < 0) 728 goto err0; 729 730 err = register_netdevice_notifier(&vlan_notifier_block); 731 if (err < 0) 732 goto err2; 733 734 err = vlan_gvrp_init(); 735 if (err < 0) 736 goto err3; 737 738 err = vlan_netlink_init(); 739 if (err < 0) 740 goto err4; 741 742 dev_add_pack(&vlan_packet_type); 743 vlan_ioctl_set(vlan_ioctl_handler); 744 return 0; 745 746 err4: 747 vlan_gvrp_uninit(); 748 err3: 749 unregister_netdevice_notifier(&vlan_notifier_block); 750 err2: 751 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 752 err0: 753 return err; 754 } 755 756 static void __exit vlan_cleanup_module(void) 757 { 758 unsigned int i; 759 760 vlan_ioctl_set(NULL); 761 vlan_netlink_fini(); 762 763 unregister_netdevice_notifier(&vlan_notifier_block); 764 765 dev_remove_pack(&vlan_packet_type); 766 767 /* This table must be empty if there are no module references left. */ 768 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) 769 BUG_ON(!hlist_empty(&vlan_group_hash[i])); 770 771 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 772 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 773 774 vlan_gvrp_uninit(); 775 } 776 777 module_init(vlan_proto_init); 778 module_exit(vlan_cleanup_module); 779 780 MODULE_LICENSE("GPL"); 781 MODULE_VERSION(DRV_VERSION); 782