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 hlist_del_rcu(&ngrp->hlist); 286 /* Free the group, after all cpu's are done. */ 287 call_rcu(&ngrp->rcu, vlan_rcu_free); 288 } 289 return err; 290 } 291 292 /* Attach a VLAN device to a mac address (ie Ethernet Card). 293 * Returns 0 if the device was created or a negative error code otherwise. 294 */ 295 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 296 { 297 struct net_device *new_dev; 298 struct net *net = dev_net(real_dev); 299 struct vlan_net *vn = net_generic(net, vlan_net_id); 300 char name[IFNAMSIZ]; 301 int err; 302 303 if (vlan_id >= VLAN_VID_MASK) 304 return -ERANGE; 305 306 err = vlan_check_real_dev(real_dev, vlan_id); 307 if (err < 0) 308 return err; 309 310 /* Gotta set up the fields for the device. */ 311 switch (vn->name_type) { 312 case VLAN_NAME_TYPE_RAW_PLUS_VID: 313 /* name will look like: eth1.0005 */ 314 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 315 break; 316 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 317 /* Put our vlan.VID in the name. 318 * Name will look like: vlan5 319 */ 320 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 321 break; 322 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 323 /* Put our vlan.VID in the name. 324 * Name will look like: eth0.5 325 */ 326 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 327 break; 328 case VLAN_NAME_TYPE_PLUS_VID: 329 /* Put our vlan.VID in the name. 330 * Name will look like: vlan0005 331 */ 332 default: 333 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 334 } 335 336 new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name, 337 vlan_setup, real_dev->num_tx_queues); 338 339 if (new_dev == NULL) 340 return -ENOBUFS; 341 342 new_dev->real_num_tx_queues = real_dev->real_num_tx_queues; 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); 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); 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 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 399 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 400 #endif 401 402 if (old_features != vlandev->features) 403 netdev_features_change(vlandev); 404 } 405 406 static void __vlan_device_event(struct net_device *dev, unsigned long event) 407 { 408 switch (event) { 409 case NETDEV_CHANGENAME: 410 vlan_proc_rem_dev(dev); 411 if (vlan_proc_add_dev(dev) < 0) 412 pr_warning("8021q: failed to change proc name for %s\n", 413 dev->name); 414 break; 415 case NETDEV_REGISTER: 416 if (vlan_proc_add_dev(dev) < 0) 417 pr_warning("8021q: failed to add proc entry for %s\n", 418 dev->name); 419 break; 420 case NETDEV_UNREGISTER: 421 vlan_proc_rem_dev(dev); 422 break; 423 } 424 } 425 426 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 427 void *ptr) 428 { 429 struct net_device *dev = ptr; 430 struct vlan_group *grp; 431 int i, flgs; 432 struct net_device *vlandev; 433 434 if (is_vlan_dev(dev)) 435 __vlan_device_event(dev, event); 436 437 grp = __vlan_find_group(dev); 438 if (!grp) 439 goto out; 440 441 /* It is OK that we do not hold the group lock right now, 442 * as we run under the RTNL lock. 443 */ 444 445 switch (event) { 446 case NETDEV_CHANGE: 447 /* Propagate real device state to vlan devices */ 448 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 449 vlandev = vlan_group_get_device(grp, i); 450 if (!vlandev) 451 continue; 452 453 vlan_transfer_operstate(dev, vlandev); 454 } 455 break; 456 457 case NETDEV_CHANGEADDR: 458 /* Adjust unicast filters on underlying device */ 459 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 460 vlandev = vlan_group_get_device(grp, i); 461 if (!vlandev) 462 continue; 463 464 flgs = vlandev->flags; 465 if (!(flgs & IFF_UP)) 466 continue; 467 468 vlan_sync_address(dev, vlandev); 469 } 470 break; 471 472 case NETDEV_CHANGEMTU: 473 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 474 vlandev = vlan_group_get_device(grp, i); 475 if (!vlandev) 476 continue; 477 478 if (vlandev->mtu <= dev->mtu) 479 continue; 480 481 dev_set_mtu(vlandev, dev->mtu); 482 } 483 break; 484 485 case NETDEV_FEAT_CHANGE: 486 /* Propagate device features to underlying device */ 487 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 488 vlandev = vlan_group_get_device(grp, i); 489 if (!vlandev) 490 continue; 491 492 vlan_transfer_features(dev, vlandev); 493 } 494 495 break; 496 497 case NETDEV_DOWN: 498 /* Put all VLANs for this dev in the down state too. */ 499 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 500 vlandev = vlan_group_get_device(grp, i); 501 if (!vlandev) 502 continue; 503 504 flgs = vlandev->flags; 505 if (!(flgs & IFF_UP)) 506 continue; 507 508 dev_change_flags(vlandev, flgs & ~IFF_UP); 509 vlan_transfer_operstate(dev, vlandev); 510 } 511 break; 512 513 case NETDEV_UP: 514 /* Put all VLANs for this dev in the up state too. */ 515 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 516 vlandev = vlan_group_get_device(grp, i); 517 if (!vlandev) 518 continue; 519 520 flgs = vlandev->flags; 521 if (flgs & IFF_UP) 522 continue; 523 524 dev_change_flags(vlandev, flgs | IFF_UP); 525 vlan_transfer_operstate(dev, vlandev); 526 } 527 break; 528 529 case NETDEV_UNREGISTER: 530 /* Delete all VLANs for this dev. */ 531 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) { 532 vlandev = vlan_group_get_device(grp, i); 533 if (!vlandev) 534 continue; 535 536 /* unregistration of last vlan destroys group, abort 537 * afterwards */ 538 if (grp->nr_vlans == 1) 539 i = VLAN_GROUP_ARRAY_LEN; 540 541 unregister_vlan_dev(vlandev); 542 } 543 break; 544 } 545 546 out: 547 return NOTIFY_DONE; 548 } 549 550 static struct notifier_block vlan_notifier_block __read_mostly = { 551 .notifier_call = vlan_device_event, 552 }; 553 554 /* 555 * VLAN IOCTL handler. 556 * o execute requested action or pass command to the device driver 557 * arg is really a struct vlan_ioctl_args __user *. 558 */ 559 static int vlan_ioctl_handler(struct net *net, void __user *arg) 560 { 561 int err; 562 struct vlan_ioctl_args args; 563 struct net_device *dev = NULL; 564 565 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 566 return -EFAULT; 567 568 /* Null terminate this sucker, just in case. */ 569 args.device1[23] = 0; 570 args.u.device2[23] = 0; 571 572 rtnl_lock(); 573 574 switch (args.cmd) { 575 case SET_VLAN_INGRESS_PRIORITY_CMD: 576 case SET_VLAN_EGRESS_PRIORITY_CMD: 577 case SET_VLAN_FLAG_CMD: 578 case ADD_VLAN_CMD: 579 case DEL_VLAN_CMD: 580 case GET_VLAN_REALDEV_NAME_CMD: 581 case GET_VLAN_VID_CMD: 582 err = -ENODEV; 583 dev = __dev_get_by_name(net, args.device1); 584 if (!dev) 585 goto out; 586 587 err = -EINVAL; 588 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 589 goto out; 590 } 591 592 switch (args.cmd) { 593 case SET_VLAN_INGRESS_PRIORITY_CMD: 594 err = -EPERM; 595 if (!capable(CAP_NET_ADMIN)) 596 break; 597 vlan_dev_set_ingress_priority(dev, 598 args.u.skb_priority, 599 args.vlan_qos); 600 err = 0; 601 break; 602 603 case SET_VLAN_EGRESS_PRIORITY_CMD: 604 err = -EPERM; 605 if (!capable(CAP_NET_ADMIN)) 606 break; 607 err = vlan_dev_set_egress_priority(dev, 608 args.u.skb_priority, 609 args.vlan_qos); 610 break; 611 612 case SET_VLAN_FLAG_CMD: 613 err = -EPERM; 614 if (!capable(CAP_NET_ADMIN)) 615 break; 616 err = vlan_dev_change_flags(dev, 617 args.vlan_qos ? args.u.flag : 0, 618 args.u.flag); 619 break; 620 621 case SET_VLAN_NAME_TYPE_CMD: 622 err = -EPERM; 623 if (!capable(CAP_NET_ADMIN)) 624 break; 625 if ((args.u.name_type >= 0) && 626 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 627 struct vlan_net *vn; 628 629 vn = net_generic(net, vlan_net_id); 630 vn->name_type = args.u.name_type; 631 err = 0; 632 } else { 633 err = -EINVAL; 634 } 635 break; 636 637 case ADD_VLAN_CMD: 638 err = -EPERM; 639 if (!capable(CAP_NET_ADMIN)) 640 break; 641 err = register_vlan_device(dev, args.u.VID); 642 break; 643 644 case DEL_VLAN_CMD: 645 err = -EPERM; 646 if (!capable(CAP_NET_ADMIN)) 647 break; 648 unregister_vlan_dev(dev); 649 err = 0; 650 break; 651 652 case GET_VLAN_REALDEV_NAME_CMD: 653 err = 0; 654 vlan_dev_get_realdev_name(dev, args.u.device2); 655 if (copy_to_user(arg, &args, 656 sizeof(struct vlan_ioctl_args))) 657 err = -EFAULT; 658 break; 659 660 case GET_VLAN_VID_CMD: 661 err = 0; 662 args.u.VID = vlan_dev_vlan_id(dev); 663 if (copy_to_user(arg, &args, 664 sizeof(struct vlan_ioctl_args))) 665 err = -EFAULT; 666 break; 667 668 default: 669 err = -EOPNOTSUPP; 670 break; 671 } 672 out: 673 rtnl_unlock(); 674 return err; 675 } 676 677 static int vlan_init_net(struct net *net) 678 { 679 int err; 680 struct vlan_net *vn; 681 682 err = -ENOMEM; 683 vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL); 684 if (vn == NULL) 685 goto err_alloc; 686 687 err = net_assign_generic(net, vlan_net_id, vn); 688 if (err < 0) 689 goto err_assign; 690 691 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 692 693 err = vlan_proc_init(net); 694 if (err < 0) 695 goto err_proc; 696 697 return 0; 698 699 err_proc: 700 /* nothing */ 701 err_assign: 702 kfree(vn); 703 err_alloc: 704 return err; 705 } 706 707 static void vlan_exit_net(struct net *net) 708 { 709 struct vlan_net *vn; 710 711 vn = net_generic(net, vlan_net_id); 712 rtnl_kill_links(net, &vlan_link_ops); 713 vlan_proc_cleanup(net); 714 kfree(vn); 715 } 716 717 static struct pernet_operations vlan_net_ops = { 718 .init = vlan_init_net, 719 .exit = vlan_exit_net, 720 }; 721 722 static int __init vlan_proto_init(void) 723 { 724 int err; 725 726 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright); 727 pr_info("All bugs added by %s\n", vlan_buggyright); 728 729 err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops); 730 if (err < 0) 731 goto err0; 732 733 err = register_netdevice_notifier(&vlan_notifier_block); 734 if (err < 0) 735 goto err2; 736 737 err = vlan_gvrp_init(); 738 if (err < 0) 739 goto err3; 740 741 err = vlan_netlink_init(); 742 if (err < 0) 743 goto err4; 744 745 dev_add_pack(&vlan_packet_type); 746 vlan_ioctl_set(vlan_ioctl_handler); 747 return 0; 748 749 err4: 750 vlan_gvrp_uninit(); 751 err3: 752 unregister_netdevice_notifier(&vlan_notifier_block); 753 err2: 754 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 755 err0: 756 return err; 757 } 758 759 static void __exit vlan_cleanup_module(void) 760 { 761 unsigned int i; 762 763 vlan_ioctl_set(NULL); 764 vlan_netlink_fini(); 765 766 unregister_netdevice_notifier(&vlan_notifier_block); 767 768 dev_remove_pack(&vlan_packet_type); 769 770 /* This table must be empty if there are no module references left. */ 771 for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) 772 BUG_ON(!hlist_empty(&vlan_group_hash[i])); 773 774 unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops); 775 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 776 777 vlan_gvrp_uninit(); 778 } 779 780 module_init(vlan_proto_init); 781 module_exit(vlan_cleanup_module); 782 783 MODULE_LICENSE("GPL"); 784 MODULE_VERSION(DRV_VERSION); 785