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 <asm/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 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, u16 vlan_id) 55 { 56 struct net_device **array; 57 unsigned int size; 58 59 ASSERT_RTNL(); 60 61 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 62 if (array != NULL) 63 return 0; 64 65 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN; 66 array = kzalloc(size, GFP_KERNEL); 67 if (array == NULL) 68 return -ENOBUFS; 69 70 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array; 71 return 0; 72 } 73 74 void unregister_vlan_dev(struct net_device *dev, struct list_head *head) 75 { 76 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 77 struct net_device *real_dev = vlan->real_dev; 78 struct vlan_info *vlan_info; 79 struct vlan_group *grp; 80 u16 vlan_id = vlan->vlan_id; 81 82 ASSERT_RTNL(); 83 84 vlan_info = rtnl_dereference(real_dev->vlan_info); 85 BUG_ON(!vlan_info); 86 87 grp = &vlan_info->grp; 88 89 /* Take it out of our own structures, but be sure to interlock with 90 * HW accelerating devices or SW vlan input packet processing if 91 * VLAN is not 0 (leave it there for 802.1p). 92 */ 93 if (vlan_id) 94 vlan_vid_del(real_dev, vlan_id); 95 96 grp->nr_vlan_devs--; 97 98 if (vlan->flags & VLAN_FLAG_GVRP) 99 vlan_gvrp_request_leave(dev); 100 101 vlan_group_set_device(grp, vlan_id, NULL); 102 /* Because unregister_netdevice_queue() makes sure at least one rcu 103 * grace period is respected before device freeing, 104 * we dont need to call synchronize_net() here. 105 */ 106 unregister_netdevice_queue(dev, head); 107 108 if (grp->nr_vlan_devs == 0) 109 vlan_gvrp_uninit_applicant(real_dev); 110 111 /* Get rid of the vlan's reference to real_dev */ 112 dev_put(real_dev); 113 } 114 115 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id) 116 { 117 const char *name = real_dev->name; 118 const struct net_device_ops *ops = real_dev->netdev_ops; 119 120 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) { 121 pr_info("VLANs not supported on %s\n", name); 122 return -EOPNOTSUPP; 123 } 124 125 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) && 126 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) { 127 pr_info("Device %s has buggy VLAN hw accel\n", name); 128 return -EOPNOTSUPP; 129 } 130 131 if (vlan_find_dev(real_dev, vlan_id) != NULL) 132 return -EEXIST; 133 134 return 0; 135 } 136 137 int register_vlan_dev(struct net_device *dev) 138 { 139 struct vlan_dev_priv *vlan = vlan_dev_priv(dev); 140 struct net_device *real_dev = vlan->real_dev; 141 u16 vlan_id = vlan->vlan_id; 142 struct vlan_info *vlan_info; 143 struct vlan_group *grp; 144 int err; 145 146 err = vlan_vid_add(real_dev, vlan_id); 147 if (err) 148 return err; 149 150 vlan_info = rtnl_dereference(real_dev->vlan_info); 151 /* vlan_info should be there now. vlan_vid_add took care of it */ 152 BUG_ON(!vlan_info); 153 154 grp = &vlan_info->grp; 155 if (grp->nr_vlan_devs == 0) { 156 err = vlan_gvrp_init_applicant(real_dev); 157 if (err < 0) 158 goto out_vid_del; 159 } 160 161 err = vlan_group_prealloc_vid(grp, vlan_id); 162 if (err < 0) 163 goto out_uninit_applicant; 164 165 err = register_netdevice(dev); 166 if (err < 0) 167 goto out_uninit_applicant; 168 169 /* Account for reference in struct vlan_dev_priv */ 170 dev_hold(real_dev); 171 172 netif_stacked_transfer_operstate(real_dev, dev); 173 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */ 174 175 /* So, got the sucker initialized, now lets place 176 * it into our local structure. 177 */ 178 vlan_group_set_device(grp, vlan_id, dev); 179 grp->nr_vlan_devs++; 180 181 return 0; 182 183 out_uninit_applicant: 184 if (grp->nr_vlan_devs == 0) 185 vlan_gvrp_uninit_applicant(real_dev); 186 out_vid_del: 187 vlan_vid_del(real_dev, vlan_id); 188 return err; 189 } 190 191 /* Attach a VLAN device to a mac address (ie Ethernet Card). 192 * Returns 0 if the device was created or a negative error code otherwise. 193 */ 194 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id) 195 { 196 struct net_device *new_dev; 197 struct net *net = dev_net(real_dev); 198 struct vlan_net *vn = net_generic(net, vlan_net_id); 199 char name[IFNAMSIZ]; 200 int err; 201 202 if (vlan_id >= VLAN_VID_MASK) 203 return -ERANGE; 204 205 err = vlan_check_real_dev(real_dev, vlan_id); 206 if (err < 0) 207 return err; 208 209 /* Gotta set up the fields for the device. */ 210 switch (vn->name_type) { 211 case VLAN_NAME_TYPE_RAW_PLUS_VID: 212 /* name will look like: eth1.0005 */ 213 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id); 214 break; 215 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD: 216 /* Put our vlan.VID in the name. 217 * Name will look like: vlan5 218 */ 219 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id); 220 break; 221 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD: 222 /* Put our vlan.VID in the name. 223 * Name will look like: eth0.5 224 */ 225 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id); 226 break; 227 case VLAN_NAME_TYPE_PLUS_VID: 228 /* Put our vlan.VID in the name. 229 * Name will look like: vlan0005 230 */ 231 default: 232 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id); 233 } 234 235 new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup); 236 237 if (new_dev == NULL) 238 return -ENOBUFS; 239 240 dev_net_set(new_dev, net); 241 /* need 4 bytes for extra VLAN header info, 242 * hope the underlying device can handle it. 243 */ 244 new_dev->mtu = real_dev->mtu; 245 246 vlan_dev_priv(new_dev)->vlan_id = vlan_id; 247 vlan_dev_priv(new_dev)->real_dev = real_dev; 248 vlan_dev_priv(new_dev)->dent = NULL; 249 vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR; 250 251 new_dev->rtnl_link_ops = &vlan_link_ops; 252 err = register_vlan_dev(new_dev); 253 if (err < 0) 254 goto out_free_newdev; 255 256 return 0; 257 258 out_free_newdev: 259 free_netdev(new_dev); 260 return err; 261 } 262 263 static void vlan_sync_address(struct net_device *dev, 264 struct net_device *vlandev) 265 { 266 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 267 268 /* May be called without an actual change */ 269 if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr)) 270 return; 271 272 /* vlan address was different from the old address and is equal to 273 * the new address */ 274 if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 275 ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 276 dev_uc_del(dev, vlandev->dev_addr); 277 278 /* vlan address was equal to the old address and is different from 279 * the new address */ 280 if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) && 281 !ether_addr_equal(vlandev->dev_addr, dev->dev_addr)) 282 dev_uc_add(dev, vlandev->dev_addr); 283 284 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN); 285 } 286 287 static void vlan_transfer_features(struct net_device *dev, 288 struct net_device *vlandev) 289 { 290 vlandev->gso_max_size = dev->gso_max_size; 291 292 if (dev->features & NETIF_F_HW_VLAN_TX) 293 vlandev->hard_header_len = dev->hard_header_len; 294 else 295 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN; 296 297 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE) 298 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid; 299 #endif 300 301 netdev_update_features(vlandev); 302 } 303 304 static void __vlan_device_event(struct net_device *dev, unsigned long event) 305 { 306 switch (event) { 307 case NETDEV_CHANGENAME: 308 vlan_proc_rem_dev(dev); 309 if (vlan_proc_add_dev(dev) < 0) 310 pr_warn("failed to change proc name for %s\n", 311 dev->name); 312 break; 313 case NETDEV_REGISTER: 314 if (vlan_proc_add_dev(dev) < 0) 315 pr_warn("failed to add proc entry for %s\n", dev->name); 316 break; 317 case NETDEV_UNREGISTER: 318 vlan_proc_rem_dev(dev); 319 break; 320 } 321 } 322 323 static int vlan_device_event(struct notifier_block *unused, unsigned long event, 324 void *ptr) 325 { 326 struct net_device *dev = ptr; 327 struct vlan_group *grp; 328 struct vlan_info *vlan_info; 329 int i, flgs; 330 struct net_device *vlandev; 331 struct vlan_dev_priv *vlan; 332 LIST_HEAD(list); 333 334 if (is_vlan_dev(dev)) 335 __vlan_device_event(dev, event); 336 337 if ((event == NETDEV_UP) && 338 (dev->features & NETIF_F_HW_VLAN_FILTER)) { 339 pr_info("adding VLAN 0 to HW filter on device %s\n", 340 dev->name); 341 vlan_vid_add(dev, 0); 342 } 343 344 vlan_info = rtnl_dereference(dev->vlan_info); 345 if (!vlan_info) 346 goto out; 347 grp = &vlan_info->grp; 348 349 /* It is OK that we do not hold the group lock right now, 350 * as we run under the RTNL lock. 351 */ 352 353 switch (event) { 354 case NETDEV_CHANGE: 355 /* Propagate real device state to vlan devices */ 356 for (i = 0; i < VLAN_N_VID; i++) { 357 vlandev = vlan_group_get_device(grp, i); 358 if (!vlandev) 359 continue; 360 361 netif_stacked_transfer_operstate(dev, vlandev); 362 } 363 break; 364 365 case NETDEV_CHANGEADDR: 366 /* Adjust unicast filters on underlying device */ 367 for (i = 0; i < VLAN_N_VID; i++) { 368 vlandev = vlan_group_get_device(grp, i); 369 if (!vlandev) 370 continue; 371 372 flgs = vlandev->flags; 373 if (!(flgs & IFF_UP)) 374 continue; 375 376 vlan_sync_address(dev, vlandev); 377 } 378 break; 379 380 case NETDEV_CHANGEMTU: 381 for (i = 0; i < VLAN_N_VID; i++) { 382 vlandev = vlan_group_get_device(grp, i); 383 if (!vlandev) 384 continue; 385 386 if (vlandev->mtu <= dev->mtu) 387 continue; 388 389 dev_set_mtu(vlandev, dev->mtu); 390 } 391 break; 392 393 case NETDEV_FEAT_CHANGE: 394 /* Propagate device features to underlying device */ 395 for (i = 0; i < VLAN_N_VID; i++) { 396 vlandev = vlan_group_get_device(grp, i); 397 if (!vlandev) 398 continue; 399 400 vlan_transfer_features(dev, vlandev); 401 } 402 403 break; 404 405 case NETDEV_DOWN: 406 /* Put all VLANs for this dev in the down state too. */ 407 for (i = 0; i < VLAN_N_VID; i++) { 408 vlandev = vlan_group_get_device(grp, i); 409 if (!vlandev) 410 continue; 411 412 flgs = vlandev->flags; 413 if (!(flgs & IFF_UP)) 414 continue; 415 416 vlan = vlan_dev_priv(vlandev); 417 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 418 dev_change_flags(vlandev, flgs & ~IFF_UP); 419 netif_stacked_transfer_operstate(dev, vlandev); 420 } 421 break; 422 423 case NETDEV_UP: 424 /* Put all VLANs for this dev in the up state too. */ 425 for (i = 0; i < VLAN_N_VID; i++) { 426 vlandev = vlan_group_get_device(grp, i); 427 if (!vlandev) 428 continue; 429 430 flgs = vlandev->flags; 431 if (flgs & IFF_UP) 432 continue; 433 434 vlan = vlan_dev_priv(vlandev); 435 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) 436 dev_change_flags(vlandev, flgs | IFF_UP); 437 netif_stacked_transfer_operstate(dev, vlandev); 438 } 439 break; 440 441 case NETDEV_UNREGISTER: 442 /* twiddle thumbs on netns device moves */ 443 if (dev->reg_state != NETREG_UNREGISTERING) 444 break; 445 446 for (i = 0; i < VLAN_N_VID; i++) { 447 vlandev = vlan_group_get_device(grp, i); 448 if (!vlandev) 449 continue; 450 451 /* removal of last vid destroys vlan_info, abort 452 * afterwards */ 453 if (vlan_info->nr_vids == 1) 454 i = VLAN_N_VID; 455 456 unregister_vlan_dev(vlandev, &list); 457 } 458 unregister_netdevice_many(&list); 459 break; 460 461 case NETDEV_PRE_TYPE_CHANGE: 462 /* Forbid underlaying device to change its type. */ 463 return NOTIFY_BAD; 464 465 case NETDEV_NOTIFY_PEERS: 466 case NETDEV_BONDING_FAILOVER: 467 /* Propagate to vlan devices */ 468 for (i = 0; i < VLAN_N_VID; i++) { 469 vlandev = vlan_group_get_device(grp, i); 470 if (!vlandev) 471 continue; 472 473 call_netdevice_notifiers(event, vlandev); 474 } 475 break; 476 } 477 478 out: 479 return NOTIFY_DONE; 480 } 481 482 static struct notifier_block vlan_notifier_block __read_mostly = { 483 .notifier_call = vlan_device_event, 484 }; 485 486 /* 487 * VLAN IOCTL handler. 488 * o execute requested action or pass command to the device driver 489 * arg is really a struct vlan_ioctl_args __user *. 490 */ 491 static int vlan_ioctl_handler(struct net *net, void __user *arg) 492 { 493 int err; 494 struct vlan_ioctl_args args; 495 struct net_device *dev = NULL; 496 497 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args))) 498 return -EFAULT; 499 500 /* Null terminate this sucker, just in case. */ 501 args.device1[23] = 0; 502 args.u.device2[23] = 0; 503 504 rtnl_lock(); 505 506 switch (args.cmd) { 507 case SET_VLAN_INGRESS_PRIORITY_CMD: 508 case SET_VLAN_EGRESS_PRIORITY_CMD: 509 case SET_VLAN_FLAG_CMD: 510 case ADD_VLAN_CMD: 511 case DEL_VLAN_CMD: 512 case GET_VLAN_REALDEV_NAME_CMD: 513 case GET_VLAN_VID_CMD: 514 err = -ENODEV; 515 dev = __dev_get_by_name(net, args.device1); 516 if (!dev) 517 goto out; 518 519 err = -EINVAL; 520 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev)) 521 goto out; 522 } 523 524 switch (args.cmd) { 525 case SET_VLAN_INGRESS_PRIORITY_CMD: 526 err = -EPERM; 527 if (!capable(CAP_NET_ADMIN)) 528 break; 529 vlan_dev_set_ingress_priority(dev, 530 args.u.skb_priority, 531 args.vlan_qos); 532 err = 0; 533 break; 534 535 case SET_VLAN_EGRESS_PRIORITY_CMD: 536 err = -EPERM; 537 if (!capable(CAP_NET_ADMIN)) 538 break; 539 err = vlan_dev_set_egress_priority(dev, 540 args.u.skb_priority, 541 args.vlan_qos); 542 break; 543 544 case SET_VLAN_FLAG_CMD: 545 err = -EPERM; 546 if (!capable(CAP_NET_ADMIN)) 547 break; 548 err = vlan_dev_change_flags(dev, 549 args.vlan_qos ? args.u.flag : 0, 550 args.u.flag); 551 break; 552 553 case SET_VLAN_NAME_TYPE_CMD: 554 err = -EPERM; 555 if (!capable(CAP_NET_ADMIN)) 556 break; 557 if ((args.u.name_type >= 0) && 558 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) { 559 struct vlan_net *vn; 560 561 vn = net_generic(net, vlan_net_id); 562 vn->name_type = args.u.name_type; 563 err = 0; 564 } else { 565 err = -EINVAL; 566 } 567 break; 568 569 case ADD_VLAN_CMD: 570 err = -EPERM; 571 if (!capable(CAP_NET_ADMIN)) 572 break; 573 err = register_vlan_device(dev, args.u.VID); 574 break; 575 576 case DEL_VLAN_CMD: 577 err = -EPERM; 578 if (!capable(CAP_NET_ADMIN)) 579 break; 580 unregister_vlan_dev(dev, NULL); 581 err = 0; 582 break; 583 584 case GET_VLAN_REALDEV_NAME_CMD: 585 err = 0; 586 vlan_dev_get_realdev_name(dev, args.u.device2); 587 if (copy_to_user(arg, &args, 588 sizeof(struct vlan_ioctl_args))) 589 err = -EFAULT; 590 break; 591 592 case GET_VLAN_VID_CMD: 593 err = 0; 594 args.u.VID = vlan_dev_vlan_id(dev); 595 if (copy_to_user(arg, &args, 596 sizeof(struct vlan_ioctl_args))) 597 err = -EFAULT; 598 break; 599 600 default: 601 err = -EOPNOTSUPP; 602 break; 603 } 604 out: 605 rtnl_unlock(); 606 return err; 607 } 608 609 static int __net_init vlan_init_net(struct net *net) 610 { 611 struct vlan_net *vn = net_generic(net, vlan_net_id); 612 int err; 613 614 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD; 615 616 err = vlan_proc_init(net); 617 618 return err; 619 } 620 621 static void __net_exit vlan_exit_net(struct net *net) 622 { 623 vlan_proc_cleanup(net); 624 } 625 626 static struct pernet_operations vlan_net_ops = { 627 .init = vlan_init_net, 628 .exit = vlan_exit_net, 629 .id = &vlan_net_id, 630 .size = sizeof(struct vlan_net), 631 }; 632 633 static int __init vlan_proto_init(void) 634 { 635 int err; 636 637 pr_info("%s v%s\n", vlan_fullname, vlan_version); 638 639 err = register_pernet_subsys(&vlan_net_ops); 640 if (err < 0) 641 goto err0; 642 643 err = register_netdevice_notifier(&vlan_notifier_block); 644 if (err < 0) 645 goto err2; 646 647 err = vlan_gvrp_init(); 648 if (err < 0) 649 goto err3; 650 651 err = vlan_netlink_init(); 652 if (err < 0) 653 goto err4; 654 655 vlan_ioctl_set(vlan_ioctl_handler); 656 return 0; 657 658 err4: 659 vlan_gvrp_uninit(); 660 err3: 661 unregister_netdevice_notifier(&vlan_notifier_block); 662 err2: 663 unregister_pernet_subsys(&vlan_net_ops); 664 err0: 665 return err; 666 } 667 668 static void __exit vlan_cleanup_module(void) 669 { 670 vlan_ioctl_set(NULL); 671 vlan_netlink_fini(); 672 673 unregister_netdevice_notifier(&vlan_notifier_block); 674 675 unregister_pernet_subsys(&vlan_net_ops); 676 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 677 678 vlan_gvrp_uninit(); 679 } 680 681 module_init(vlan_proto_init); 682 module_exit(vlan_cleanup_module); 683 684 MODULE_LICENSE("GPL"); 685 MODULE_VERSION(DRV_VERSION); 686